3party/mongoose
0
0
Fork 0
mirror of https://github.com/cesanta/mongoose.git synced 2024-12-27 23:21:04 +08:00
Code Issues Projects Releases Wiki Activity
mongoose/mongoose.c

4156 lines
129 KiB
C
Raw Blame History

// Copyright (c) 2004-2010 Sergey Lyubka
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#if defined(_WIN32)
#define _CRT_SECURE_NO_WARNINGS // Disable deprecation warning in VS2005
#else
#define _XOPEN_SOURCE 600 // For flockfile() on Linux
#define _LARGEFILE_SOURCE // Enable 64-bit file offsets
#define __STDC_FORMAT_MACROS // <inttypes.h> wants this for C++
#endif
#if defined(__SYMBIAN32__)
#define NO_SSL // SSL is not supported
#define NO_CGI // CGI is not supported
#define PATH_MAX FILENAME_MAX
#endif // __SYMBIAN32__
#ifndef _WIN32_WCE // Some ANSI #includes are not available on Windows CE
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <signal.h>
#include <fcntl.h>
#endif // !_WIN32_WCE
#include <time.h>
#include <stdlib.h>
#include <stdarg.h>
#include <assert.h>
#include <string.h>
#include <ctype.h>
#include <limits.h>
#include <stddef.h>
#include <stdio.h>
#if defined(_WIN32) && !defined(__SYMBIAN32__) // Windows specific
#define _WIN32_WINNT 0x0400 // To make it link in VS2005
#include <windows.h>
#ifndef PATH_MAX
#define PATH_MAX MAX_PATH
#endif
#ifndef _WIN32_WCE
#include <process.h>
#include <direct.h>
#include <io.h>
#else // _WIN32_WCE
#include <winsock2.h>
#define NO_CGI // WinCE has no pipes
typedef long off_t;
#define BUFSIZ 4096
#define errno GetLastError()
#define strerror(x) _ultoa(x, (char *) _alloca(sizeof(x) *3 ), 10)
#endif // _WIN32_WCE
#define MAKEUQUAD(lo, hi) ((uint64_t)(((uint32_t)(lo)) | \
((uint64_t)((uint32_t)(hi))) << 32))
#define RATE_DIFF 10000000 // 100 nsecs
#define EPOCH_DIFF MAKEUQUAD(0xd53e8000, 0x019db1de)
#define SYS2UNIX_TIME(lo, hi) \
(time_t) ((MAKEUQUAD((lo), (hi)) - EPOCH_DIFF) / RATE_DIFF)
// Visual Studio 6 does not know __func__ or __FUNCTION__
// The rest of MS compilers use __FUNCTION__, not C99 __func__
// Also use _strtoui64 on modern M$ compilers
#if defined(_MSC_VER) && _MSC_VER < 1300
#define STRX(x) #x
#define STR(x) STRX(x)
#define __func__ "line " STR(__LINE__)
#define strtoull(x, y, z) strtoul(x, y, z)
#define strtoll(x, y, z) strtol(x, y, z)
#else
#define __func__ __FUNCTION__
#define strtoull(x, y, z) _strtoui64(x, y, z)
#define strtoll(x, y, z) _strtoi64(x, y, z)
#endif // _MSC_VER
#define ERRNO GetLastError()
#define NO_SOCKLEN_T
#define SSL_LIB "ssleay32.dll"
#define CRYPTO_LIB "libeay32.dll"
#define DIRSEP '\\'
#define IS_DIRSEP_CHAR(c) ((c) == '/' || (c) == '\\')
#define O_NONBLOCK 0
#if !defined(EWOULDBLOCK)
#define EWOULDBLOCK WSAEWOULDBLOCK
#endif // !EWOULDBLOCK
#define _POSIX_
#define INT64_FMT "I64d"
#define WINCDECL __cdecl
#define SHUT_WR 1
#define snprintf _snprintf
#define vsnprintf _vsnprintf
#define sleep(x) Sleep((x) * 1000)
#define pipe(x) _pipe(x, BUFSIZ, _O_BINARY)
#define popen(x, y) _popen(x, y)
#define pclose(x) _pclose(x)
#define close(x) _close(x)
#define dlsym(x,y) GetProcAddress((HINSTANCE) (x), (y))
#define RTLD_LAZY 0
#define fseeko(x, y, z) fseek((x), (y), (z))
#define fdopen(x, y) _fdopen((x), (y))
#define write(x, y, z) _write((x), (y), (unsigned) z)
#define read(x, y, z) _read((x), (y), (unsigned) z)
#define flockfile(x) (void) 0
#define funlockfile(x) (void) 0
#if !defined(fileno)
#define fileno(x) _fileno(x)
#endif // !fileno MINGW #defines fileno
typedef HANDLE pthread_mutex_t;
typedef struct {HANDLE signal, broadcast;} pthread_cond_t;
typedef DWORD pthread_t;
#define pid_t HANDLE // MINGW typedefs pid_t to int. Using #define here.
struct timespec {
long tv_nsec;
long tv_sec;
};
static int pthread_mutex_lock(pthread_mutex_t *);
static int pthread_mutex_unlock(pthread_mutex_t *);
static FILE *mg_fopen(const char *path, const char *mode);
#if defined(HAVE_STDINT)
#include <stdint.h>
#else
typedef unsigned int uint32_t;
typedef unsigned short uint16_t;
typedef unsigned __int64 uint64_t;
typedef __int64 int64_t;
#define INT64_MAX 9223372036854775807
#endif // HAVE_STDINT
// POSIX dirent interface
struct dirent {
char d_name[PATH_MAX];
};
typedef struct DIR {
HANDLE handle;
WIN32_FIND_DATAW info;
struct dirent result;
} DIR;
#else // UNIX specific
#include <sys/wait.h>
#include <sys/socket.h>
#include <sys/select.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/time.h>
#include <stdint.h>
#include <inttypes.h>
#include <netdb.h>
#include <pwd.h>
#include <unistd.h>
#include <dirent.h>
#if !defined(NO_SSL_DL) && !defined(NO_SSL)
#include <dlfcn.h>
#endif
#include <pthread.h>
#if defined(__MACH__)
#define SSL_LIB "libssl.dylib"
#define CRYPTO_LIB "libcrypto.dylib"
#else
#if !defined(SSL_LIB)
#define SSL_LIB "libssl.so"
#endif
#if !defined(CRYPTO_LIB)
#define CRYPTO_LIB "libcrypto.so"
#endif
#endif
#define DIRSEP '/'
#define IS_DIRSEP_CHAR(c) ((c) == '/')
#ifndef O_BINARY
#define O_BINARY 0
#endif // O_BINARY
#define closesocket(a) close(a)
#define mg_fopen(x, y) fopen(x, y)
#define mg_mkdir(x, y) mkdir(x, y)
#define mg_remove(x) remove(x)
#define mg_rename(x, y) rename(x, y)
#define ERRNO errno
#define INVALID_SOCKET (-1)
#define INT64_FMT PRId64
typedef int SOCKET;
#define WINCDECL
#endif // End of Windows and UNIX specific includes
#include "mongoose.h"
#define MONGOOSE_VERSION "3.1"
#define PASSWORDS_FILE_NAME ".htpasswd"
#define CGI_ENVIRONMENT_SIZE 4096
#define MAX_CGI_ENVIR_VARS 64
#define ARRAY_SIZE(array) (sizeof(array) / sizeof(array[0]))
#if defined(DEBUG)
#define DEBUG_TRACE(x) do { \
flockfile(stdout); \
printf("*** %lu.%p.%s.%d: ", \
(unsigned long) time(NULL), (void *) pthread_self(), \
__func__, __LINE__); \
printf x; \
putchar('\n'); \
fflush(stdout); \
funlockfile(stdout); \
} while (0)
#else
#define DEBUG_TRACE(x)
#endif // DEBUG
// Darwin prior to 7.0 and Win32 do not have socklen_t
#ifdef NO_SOCKLEN_T
typedef int socklen_t;
#endif // NO_SOCKLEN_T
typedef void * (*mg_thread_func_t)(void *);
static const char *http_500_error = "Internal Server Error";
// Snatched from OpenSSL includes. I put the prototypes here to be independent
// from the OpenSSL source installation. Having this, mongoose + SSL can be
// built on any system with binary SSL libraries installed.
typedef struct ssl_st SSL;
typedef struct ssl_method_st SSL_METHOD;
typedef struct ssl_ctx_st SSL_CTX;
#define SSL_ERROR_WANT_READ 2
#define SSL_ERROR_WANT_WRITE 3
#define SSL_FILETYPE_PEM 1
#define CRYPTO_LOCK 1
#if defined(NO_SSL_DL)
extern void SSL_free(SSL *);
extern int SSL_accept(SSL *);
extern int SSL_connect(SSL *);
extern int SSL_read(SSL *, void *, int);
extern int SSL_write(SSL *, const void *, int);
extern int SSL_get_error(const SSL *, int);
extern int SSL_set_fd(SSL *, int);
extern SSL *SSL_new(SSL_CTX *);
extern SSL_CTX *SSL_CTX_new(SSL_METHOD *);
extern SSL_METHOD *SSLv23_server_method(void);
extern int SSL_library_init(void);
extern void SSL_load_error_strings(void);
extern int SSL_CTX_use_PrivateKey_file(SSL_CTX *, const char *, int);
extern int SSL_CTX_use_certificate_file(SSL_CTX *, const char *, int);
extern int SSL_CTX_use_certificate_chain_file(SSL_CTX *, const char *);
extern void SSL_CTX_set_default_passwd_cb(SSL_CTX *, mg_callback_t);
extern void SSL_CTX_free(SSL_CTX *);
extern unsigned long ERR_get_error(void);
extern char *ERR_error_string(unsigned long, char *);
extern int CRYPTO_num_locks(void);
extern void CRYPTO_set_locking_callback(void (*)(int, int, const char *, int));
extern void CRYPTO_set_id_callback(unsigned long (*)(void));
#else
// Dynamically loaded SSL functionality
struct ssl_func {
const char *name; // SSL function name
void (*ptr)(void); // Function pointer
};
#define SSL_free (* (void (*)(SSL *)) ssl_sw[0].ptr)
#define SSL_accept (* (int (*)(SSL *)) ssl_sw[1].ptr)
#define SSL_connect (* (int (*)(SSL *)) ssl_sw[2].ptr)
#define SSL_read (* (int (*)(SSL *, void *, int)) ssl_sw[3].ptr)
#define SSL_write (* (int (*)(SSL *, const void *,int)) ssl_sw[4].ptr)
#define SSL_get_error (* (int (*)(SSL *, int)) ssl_sw[5].ptr)
#define SSL_set_fd (* (int (*)(SSL *, SOCKET)) ssl_sw[6].ptr)
#define SSL_new (* (SSL * (*)(SSL_CTX *)) ssl_sw[7].ptr)
#define SSL_CTX_new (* (SSL_CTX * (*)(SSL_METHOD *)) ssl_sw[8].ptr)
#define SSLv23_server_method (* (SSL_METHOD * (*)(void)) ssl_sw[9].ptr)
#define SSL_library_init (* (int (*)(void)) ssl_sw[10].ptr)
#define SSL_CTX_use_PrivateKey_file (* (int (*)(SSL_CTX *, \
const char *, int)) ssl_sw[11].ptr)
#define SSL_CTX_use_certificate_file (* (int (*)(SSL_CTX *, \
const char *, int)) ssl_sw[12].ptr)
#define SSL_CTX_set_default_passwd_cb \
(* (void (*)(SSL_CTX *, mg_callback_t)) ssl_sw[13].ptr)
#define SSL_CTX_free (* (void (*)(SSL_CTX *)) ssl_sw[14].ptr)
#define SSL_load_error_strings (* (void (*)(void)) ssl_sw[15].ptr)
#define SSL_CTX_use_certificate_chain_file \
(* (int (*)(SSL_CTX *, const char *)) ssl_sw[16].ptr)
#define CRYPTO_num_locks (* (int (*)(void)) crypto_sw[0].ptr)
#define CRYPTO_set_locking_callback \
(* (void (*)(void (*)(int, int, const char *, int))) crypto_sw[1].ptr)
#define CRYPTO_set_id_callback \
(* (void (*)(unsigned long (*)(void))) crypto_sw[2].ptr)
#define ERR_get_error (* (unsigned long (*)(void)) crypto_sw[3].ptr)
#define ERR_error_string (* (char * (*)(unsigned long,char *)) crypto_sw[4].ptr)
// set_ssl_option() function updates this array.
// It loads SSL library dynamically and changes NULLs to the actual addresses
// of respective functions. The macros above (like SSL_connect()) are really
// just calling these functions indirectly via the pointer.
static struct ssl_func ssl_sw[] = {
{"SSL_free", NULL},
{"SSL_accept", NULL},
{"SSL_connect", NULL},
{"SSL_read", NULL},
{"SSL_write", NULL},
{"SSL_get_error", NULL},
{"SSL_set_fd", NULL},
{"SSL_new", NULL},
{"SSL_CTX_new", NULL},
{"SSLv23_server_method", NULL},
{"SSL_library_init", NULL},
{"SSL_CTX_use_PrivateKey_file", NULL},
{"SSL_CTX_use_certificate_file",NULL},
{"SSL_CTX_set_default_passwd_cb",NULL},
{"SSL_CTX_free", NULL},
{"SSL_load_error_strings", NULL},
{"SSL_CTX_use_certificate_chain_file", NULL},
{NULL, NULL}
};
// Similar array as ssl_sw. These functions could be located in different lib.
static struct ssl_func crypto_sw[] = {
{"CRYPTO_num_locks", NULL},
{"CRYPTO_set_locking_callback", NULL},
{"CRYPTO_set_id_callback", NULL},
{"ERR_get_error", NULL},
{"ERR_error_string", NULL},
{NULL, NULL}
};
#endif // NO_SSL_DL
static const char *month_names[] = {
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};
// Unified socket address. For IPv6 support, add IPv6 address structure
// in the union u.
struct usa {
socklen_t len;
union {
struct sockaddr sa;
struct sockaddr_in sin;
} u;
};
// Describes a string (chunk of memory).
struct vec {
const char *ptr;
size_t len;
};
// Structure used by mg_stat() function. Uses 64 bit file length.
struct mgstat {
int is_directory; // Directory marker
int64_t size; // File size
time_t mtime; // Modification time
};
// Describes listening socket, or socket which was accept()-ed by the master
// thread and queued for future handling by the worker thread.
struct socket {
struct socket *next; // Linkage
SOCKET sock; // Listening socket
struct usa lsa; // Local socket address
struct usa rsa; // Remote socket address
int is_ssl; // Is socket SSL-ed
int is_proxy;
};
enum {
CGI_EXTENSIONS, CGI_ENVIRONMENT, PUT_DELETE_PASSWORDS_FILE, CGI_INTERPRETER,
PROTECT_URI, AUTHENTICATION_DOMAIN, SSI_EXTENSIONS, ACCESS_LOG_FILE,
SSL_CHAIN_FILE, ENABLE_DIRECTORY_LISTING, ERROR_LOG_FILE,
GLOBAL_PASSWORDS_FILE, INDEX_FILES,
ENABLE_KEEP_ALIVE, ACCESS_CONTROL_LIST, MAX_REQUEST_SIZE,
EXTRA_MIME_TYPES, LISTENING_PORTS,
DOCUMENT_ROOT, SSL_CERTIFICATE, NUM_THREADS, RUN_AS_USER,
NUM_OPTIONS
};
static const char *config_options[] = {
"C", "cgi_extensions", ".cgi,.pl,.php",
"E", "cgi_environment", NULL,
"G", "put_delete_passwords_file", NULL,
"I", "cgi_interpreter", NULL,
"P", "protect_uri", NULL,
"R", "authentication_domain", "mydomain.com",
"S", "ssi_extensions", ".shtml,.shtm",
"a", "access_log_file", NULL,
"c", "ssl_chain_file", NULL,
"d", "enable_directory_listing", "yes",
"e", "error_log_file", NULL,
"g", "global_passwords_file", NULL,
"i", "index_files", "index.html,index.htm,index.cgi",
"k", "enable_keep_alive", "no",
"l", "access_control_list", NULL,
"M", "max_request_size", "16384",
"m", "extra_mime_types", NULL,
"p", "listening_ports", "8080",
"r", "document_root", ".",
"s", "ssl_certificate", NULL,
"t", "num_threads", "10",
"u", "run_as_user", NULL,
NULL
};
#define ENTRIES_PER_CONFIG_OPTION 3
struct mg_context {
volatile int stop_flag; // Should we stop event loop
SSL_CTX *ssl_ctx; // SSL context
char *config[NUM_OPTIONS]; // Mongoose configuration parameters
mg_callback_t user_callback; // User-defined callback function
void *user_data; // User-defined data
struct socket *listening_sockets;
volatile int num_threads; // Number of threads
pthread_mutex_t mutex; // Protects (max|num)_threads
pthread_cond_t cond; // Condvar for tracking workers terminations
struct socket queue[20]; // Accepted sockets
volatile int sq_head; // Head of the socket queue
volatile int sq_tail; // Tail of the socket queue
pthread_cond_t sq_full; // Singaled when socket is produced
pthread_cond_t sq_empty; // Signaled when socket is consumed
};
struct mg_connection {
struct mg_connection *peer; // Remote target in proxy mode
struct mg_request_info request_info;
struct mg_context *ctx;
SSL *ssl; // SSL descriptor
struct socket client; // Connected client
time_t birth_time; // Time connection was accepted
int64_t num_bytes_sent; // Total bytes sent to client
int64_t content_len; // Content-Length header value
int64_t consumed_content; // How many bytes of content is already read
char *buf; // Buffer for received data
int buf_size; // Buffer size
int request_len; // Size of the request + headers in a buffer
int data_len; // Total size of data in a buffer
};
const char **mg_get_valid_option_names(void) {
return config_options;
}
static void *call_user(struct mg_connection *conn, enum mg_event event) {
conn->request_info.user_data = conn->ctx->user_data;
return conn->ctx->user_callback == NULL ? NULL :
conn->ctx->user_callback(event, conn, &conn->request_info);
}
static int get_option_index(const char *name) {
int i;
for (i = 0; config_options[i] != NULL; i += ENTRIES_PER_CONFIG_OPTION) {
if (strcmp(config_options[i], name) == 0 ||
strcmp(config_options[i + 1], name) == 0) {
return i / ENTRIES_PER_CONFIG_OPTION;
}
}
return -1;
}
const char *mg_get_option(const struct mg_context *ctx, const char *name) {
int i;
if ((i = get_option_index(name)) == -1) {
return NULL;
} else if (ctx->config[i] == NULL) {
return "";
} else {
return ctx->config[i];
}
}
// Print error message to the opened error log stream.
static void cry(struct mg_connection *conn, const char *fmt, ...) {
char buf[BUFSIZ];
va_list ap;
FILE *fp;
time_t timestamp;
va_start(ap, fmt);
(void) vsnprintf(buf, sizeof(buf), fmt, ap);
va_end(ap);
// Do not lock when getting the callback value, here and below.
// I suppose this is fine, since function cannot disappear in the
// same way string option can.
conn->request_info.log_message = buf;
if (call_user(conn, MG_EVENT_LOG) == NULL) {
fp = conn->ctx->config[ERROR_LOG_FILE] == NULL ? NULL :
mg_fopen(conn->ctx->config[ERROR_LOG_FILE], "a+");
if (fp != NULL) {
flockfile(fp);
timestamp = time(NULL);
(void) fprintf(fp,
"[%010lu] [error] [client %s] ",
(unsigned long) timestamp,
inet_ntoa(conn->client.rsa.u.sin.sin_addr));
if (conn->request_info.request_method != NULL) {
(void) fprintf(fp, "%s %s: ",
conn->request_info.request_method,
conn->request_info.uri);
}
(void) fprintf(fp, "%s", buf);
fputc('\n', fp);
funlockfile(fp);
if (fp != stderr) {
fclose(fp);
}
}
}
conn->request_info.log_message = NULL;
}
// Return OpenSSL error message
static const char *ssl_error(void) {
unsigned long err;
err = ERR_get_error();
return err == 0 ? "" : ERR_error_string(err, NULL);
}
// Return fake connection structure. Used for logging, if connection
// is not applicable at the moment of logging.
static struct mg_connection *fc(struct mg_context *ctx) {
static struct mg_connection fake_connection;
fake_connection.ctx = ctx;
return &fake_connection;
}
const char *mg_version(void) {
return MONGOOSE_VERSION;
}
static void mg_strlcpy(register char *dst, register const char *src, size_t n) {
for (; *src != '\0' && n > 1; n--) {
*dst++ = *src++;
}
*dst = '\0';
}
static int lowercase(const char *s) {
return tolower(* (const unsigned char *) s);
}
static int mg_strncasecmp(const char *s1, const char *s2, size_t len) {
int diff = 0;
if (len > 0)
do {
diff = lowercase(s1++) - lowercase(s2++);
} while (diff == 0 && s1[-1] != '\0' && --len > 0);
return diff;
}
static int mg_strcasecmp(const char *s1, const char *s2) {
int diff;
do {
diff = lowercase(s1++) - lowercase(s2++);
} while (diff == 0 && s1[-1] != '\0');
return diff;
}
static char * mg_strndup(const char *ptr, size_t len) {
char *p;
if ((p = (char *) malloc(len + 1)) != NULL) {
mg_strlcpy(p, ptr, len + 1);
}
return p;
}
static char * mg_strdup(const char *str) {
return mg_strndup(str, strlen(str));
}
// Like snprintf(), but never returns negative value, or the value
// that is larger than a supplied buffer.
// Thanks to Adam Zeldis to pointing snprintf()-caused vulnerability
// in his audit report.
static int mg_vsnprintf(struct mg_connection *conn, char *buf, size_t buflen,
const char *fmt, va_list ap) {
int n;
if (buflen == 0)
return 0;
n = vsnprintf(buf, buflen, fmt, ap);
if (n < 0) {
cry(conn, "vsnprintf error");
n = 0;
} else if (n >= (int) buflen) {
cry(conn, "truncating vsnprintf buffer: [%.*s]",
n > 200 ? 200 : n, buf);
n = (int) buflen - 1;
}
buf[n] = '\0';
return n;
}
static int mg_snprintf(struct mg_connection *conn, char *buf, size_t buflen,
const char *fmt, ...) {
va_list ap;
int n;
va_start(ap, fmt);
n = mg_vsnprintf(conn, buf, buflen, fmt, ap);
va_end(ap);
return n;
}
// Skip the characters until one of the delimiters characters found.
// 0-terminate resulting word. Skip the delimiter and following whitespaces if any.
// Advance pointer to buffer to the next word. Return found 0-terminated word.
// Delimiters can be quoted with quotechar.
static char *skip_quoted(char **buf, const char *delimiters, const char *whitespace, char quotechar) {
char *p, *begin_word, *end_word, *end_whitespace;
begin_word = *buf;
end_word = begin_word + strcspn(begin_word, delimiters);
/* Check for quotechar */
if (end_word > begin_word) {
p = end_word - 1;
while (*p == quotechar) {
/* If there is anything beyond end_word, copy it */
if (*end_word == '\0') {
*p = '\0';
break;
} else {
size_t end_off = strcspn(end_word + 1, delimiters);
memmove (p, end_word, end_off + 1);
p += end_off; /* p must correspond to end_word - 1 */
end_word += end_off + 1;
}
}
for (p++; p < end_word; p++) {
*p = '\0';
}
}
if (*end_word == '\0') {
*buf = end_word;
} else {
end_whitespace = end_word + 1 + strspn(end_word + 1, whitespace);
for (p = end_word; p < end_whitespace; p++) {
*p = '\0';
}
*buf = end_whitespace;
}
return begin_word;
}
// Simplified version of skip_quoted without quote char
// and whitespace == delimiters
static char *skip(char **buf, const char *delimiters) {
return skip_quoted(buf, delimiters, delimiters, 0);
}
// Return HTTP header value, or NULL if not found.
static const char *get_header(const struct mg_request_info *ri,
const char *name) {
int i;
for (i = 0; i < ri->num_headers; i++)
if (!mg_strcasecmp(name, ri->http_headers[i].name))
return ri->http_headers[i].value;
return NULL;
}
const char *mg_get_header(const struct mg_connection *conn, const char *name) {
return get_header(&conn->request_info, name);
}
// A helper function for traversing comma separated list of values.
// It returns a list pointer shifted to the next value, of NULL if the end
// of the list found.
// Value is stored in val vector. If value has form "x=y", then eq_val
// vector is initialized to point to the "y" part, and val vector length
// is adjusted to point only to "x".
static const char *next_option(const char *list, struct vec *val,
struct vec *eq_val) {
if (list == NULL || *list == '\0') {
/* End of the list */
list = NULL;
} else {
val->ptr = list;
if ((list = strchr(val->ptr, ',')) != NULL) {
/* Comma found. Store length and shift the list ptr */
val->len = list - val->ptr;
list++;
} else {
/* This value is the last one */
list = val->ptr + strlen(val->ptr);
val->len = list - val->ptr;
}
if (eq_val != NULL) {
/*
* Value has form "x=y", adjust pointers and lengths
* so that val points to "x", and eq_val points to "y".
*/
eq_val->len = 0;
eq_val->ptr = (const char *) memchr(val->ptr, '=', val->len);
if (eq_val->ptr != NULL) {
eq_val->ptr++; /* Skip over '=' character */
eq_val->len = val->ptr + val->len - eq_val->ptr;
val->len = (eq_val->ptr - val->ptr) - 1;
}
}
}
return list;
}
#if !defined(NO_CGI)
static int match_extension(const char *path, const char *ext_list) {
struct vec ext_vec;
size_t path_len;
path_len = strlen(path);
while ((ext_list = next_option(ext_list, &ext_vec, NULL)) != NULL)
if (ext_vec.len < path_len &&
mg_strncasecmp(path + path_len - ext_vec.len,
ext_vec.ptr, ext_vec.len) == 0)
return 1;
return 0;
}
#endif // !NO_CGI
// HTTP 1.1 assumes keep alive if "Connection:" header is not set
// This function must tolerate situations when connection info is not
// set up, for example if request parsing failed.
static int should_keep_alive(const struct mg_connection *conn) {
const char *http_version = conn->request_info.http_version;
const char *header = mg_get_header(conn, "Connection");
return (header == NULL && http_version && !strcmp(http_version, "1.1")) ||
(header != NULL && !mg_strcasecmp(header, "keep-alive"));
}
static const char *suggest_connection_header(const struct mg_connection *conn) {
return should_keep_alive(conn) ? "keep-alive" : "close";
}
static void send_http_error(struct mg_connection *conn, int status,
const char *reason, const char *fmt, ...) {
char buf[BUFSIZ];
va_list ap;
int len;
conn->request_info.status_code = status;
if (call_user(conn, MG_HTTP_ERROR) == NULL) {
buf[0] = '\0';
len = 0;
/* Errors 1xx, 204 and 304 MUST NOT send a body */
if (status > 199 && status != 204 && status != 304) {
len = mg_snprintf(conn, buf, sizeof(buf), "Error %d: %s", status, reason);
cry(conn, "%s", buf);
buf[len++] = '\n';
va_start(ap, fmt);
len += mg_vsnprintf(conn, buf + len, sizeof(buf) - len, fmt, ap);
va_end(ap);
}
DEBUG_TRACE(("[%s]", buf));
mg_printf(conn, "HTTP/1.1 %d %s\r\n"
"Content-Type: text/plain\r\n"
"Content-Length: %d\r\n"
"Connection: %s\r\n\r\n", status, reason, len,
suggest_connection_header(conn));
conn->num_bytes_sent += mg_printf(conn, "%s", buf);
}
}
#if defined(_WIN32) && !defined(__SYMBIAN32__)
static int pthread_mutex_init(pthread_mutex_t *mutex, void *unused) {
unused = NULL;
*mutex = CreateMutex(NULL, FALSE, NULL);
return *mutex == NULL ? -1 : 0;
}
static int pthread_mutex_destroy(pthread_mutex_t *mutex) {
return CloseHandle(*mutex) == 0 ? -1 : 0;
}
static int pthread_mutex_lock(pthread_mutex_t *mutex) {
return WaitForSingleObject(*mutex, INFINITE) == WAIT_OBJECT_0? 0 : -1;
}
static int pthread_mutex_unlock(pthread_mutex_t *mutex) {
return ReleaseMutex(*mutex) == 0 ? -1 : 0;
}
static int pthread_cond_init(pthread_cond_t *cv, const void *unused) {
unused = NULL;
cv->signal = CreateEvent(NULL, FALSE, FALSE, NULL);
cv->broadcast = CreateEvent(NULL, TRUE, FALSE, NULL);
return cv->signal != NULL && cv->broadcast != NULL ? 0 : -1;
}
static int pthread_cond_wait(pthread_cond_t *cv, pthread_mutex_t *mutex) {
HANDLE handles[] = {cv->signal, cv->broadcast};
ReleaseMutex(*mutex);
WaitForMultipleObjects(2, handles, FALSE, INFINITE);
return WaitForSingleObject(*mutex, INFINITE) == WAIT_OBJECT_0? 0 : -1;
}
static int pthread_cond_signal(pthread_cond_t *cv) {
return SetEvent(cv->signal) == 0 ? -1 : 0;
}
static int pthread_cond_broadcast(pthread_cond_t *cv) {
// Implementation with PulseEvent() has race condition, see
// http://www.cs.wustl.edu/~schmidt/win32-cv-1.html
return PulseEvent(cv->broadcast) == 0 ? -1 : 0;
}
static int pthread_cond_destroy(pthread_cond_t *cv) {
return CloseHandle(cv->signal) && CloseHandle(cv->broadcast) ? 0 : -1;
}
static pthread_t pthread_self(void) {
return GetCurrentThreadId();
}
// For Windows, change all slashes to backslashes in path names.
static void change_slashes_to_backslashes(char *path) {
int i;
for (i = 0; path[i] != '\0'; i++) {
if (path[i] == '/')
path[i] = '\\';
// i > 0 check is to preserve UNC paths, like \\server\file.txt
if (path[i] == '\\' && i > 0)
while (path[i + 1] == '\\' || path[i + 1] == '/')
(void) memmove(path + i + 1,
path + i + 2, strlen(path + i + 1));
}
}
// Encode 'path' which is assumed UTF-8 string, into UNICODE string.
// wbuf and wbuf_len is a target buffer and its length.
static void to_unicode(const char *path, wchar_t *wbuf, size_t wbuf_len) {
char buf[PATH_MAX], *p;
mg_strlcpy(buf, path, sizeof(buf));
change_slashes_to_backslashes(buf);
// Point p to the end of the file name
p = buf + strlen(buf) - 1;
// Trim trailing backslash character
while (p > buf && *p == '\\' && p[-1] != ':') {
*p-- = '\0';
}
// Protect from CGI code disclosure.
// This is very nasty hole. Windows happily opens files with
// some garbage in the end of file name. So fopen("a.cgi ", "r")
// actually opens "a.cgi", and does not return an error!
if (*p == 0x20 || // No space at the end
(*p == 0x2e && p > buf) || // No '.' but allow '.' as full path
*p == 0x2b || // No '+'
(*p & ~0x7f)) { // And generally no non-ascii chars
(void) fprintf(stderr, "Rejecting suspicious path: [%s]", buf);
buf[0] = '\0';
}
(void) MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, (int) wbuf_len);
}
#if defined(_WIN32_WCE)
static time_t time(time_t *ptime) {
time_t t;
SYSTEMTIME st;
FILETIME ft;
GetSystemTime(&st);
SystemTimeToFileTime(&st, &ft);
t = SYS2UNIX_TIME(ft.dwLowDateTime, ft.dwHighDateTime);
if (ptime != NULL) {
*ptime = t;
}
return t;
}
static time_t mktime(struct tm *ptm) {
SYSTEMTIME st;
FILETIME ft, lft;
st.wYear = ptm->tm_year + 1900;
st.wMonth = ptm->tm_mon + 1;
st.wDay = ptm->tm_mday;
st.wHour = ptm->tm_hour;
st.wMinute = ptm->tm_min;
st.wSecond = ptm->tm_sec;
st.wMilliseconds = 0;
SystemTimeToFileTime(&st, &ft);
LocalFileTimeToFileTime(&ft, &lft);
return (time_t) ((MAKEUQUAD(lft.dwLowDateTime, lft.dwHighDateTime) -
EPOCH_DIFF) / RATE_DIFF);
}
static struct tm *localtime(const time_t *ptime, struct tm *ptm) {
int64_t t = ((int64_t) *ptime) * RATE_DIFF + EPOCH_DIFF;
FILETIME ft, lft;
SYSTEMTIME st;
TIME_ZONE_INFORMATION tzinfo;
if (ptm == NULL) {
return NULL;
}
* (int64_t *) &ft = t;
FileTimeToLocalFileTime(&ft, &lft);
FileTimeToSystemTime(&lft, &st);
ptm->tm_year = st.wYear - 1900;
ptm->tm_mon = st.wMonth - 1;
ptm->tm_wday = st.wDayOfWeek;
ptm->tm_mday = st.wDay;
ptm->tm_hour = st.wHour;
ptm->tm_min = st.wMinute;
ptm->tm_sec = st.wSecond;
ptm->tm_yday = 0; // hope nobody uses this
ptm->tm_isdst =
GetTimeZoneInformation(&tzinfo) == TIME_ZONE_ID_DAYLIGHT ? 1 : 0;
return ptm;
}
static size_t strftime(char *dst, size_t dst_size, const char *fmt,
const struct tm *tm) {
(void) snprintf(dst, dst_size, "implement strftime() for WinCE");
return 0;
}
#endif
static int mg_rename(const char* oldname, const char* newname) {
wchar_t woldbuf[PATH_MAX];
wchar_t wnewbuf[PATH_MAX];
to_unicode(oldname, woldbuf, ARRAY_SIZE(woldbuf));
to_unicode(newname, wnewbuf, ARRAY_SIZE(wnewbuf));
return MoveFileW(woldbuf, wnewbuf) ? 0 : -1;
}
static FILE *mg_fopen(const char *path, const char *mode) {
wchar_t wbuf[PATH_MAX], wmode[20];
to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
MultiByteToWideChar(CP_UTF8, 0, mode, -1, wmode, ARRAY_SIZE(wmode));
return _wfopen(wbuf, wmode);
}
static int mg_stat(const char *path, struct mgstat *stp) {
int ok = -1; // Error
wchar_t wbuf[PATH_MAX];
WIN32_FILE_ATTRIBUTE_DATA info;
to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
if (GetFileAttributesExW(wbuf, GetFileExInfoStandard, &info) != 0) {
stp->size = MAKEUQUAD(info.nFileSizeLow, info.nFileSizeHigh);
stp->mtime = SYS2UNIX_TIME(info.ftLastWriteTime.dwLowDateTime,
info.ftLastWriteTime.dwHighDateTime);
stp->is_directory =
info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY;
ok = 0; // Success
}
return ok;
}
static int mg_remove(const char *path) {
wchar_t wbuf[PATH_MAX];
to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
return DeleteFileW(wbuf) ? 0 : -1;
}
static int mg_mkdir(const char *path, int mode) {
char buf[PATH_MAX];
wchar_t wbuf[PATH_MAX];
mode = 0; // Unused
mg_strlcpy(buf, path, sizeof(buf));
change_slashes_to_backslashes(buf);
(void) MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, sizeof(wbuf));
return CreateDirectoryW(wbuf, NULL) ? 0 : -1;
}
// Implementation of POSIX opendir/closedir/readdir for Windows.
static DIR * opendir(const char *name) {
DIR *dir = NULL;
wchar_t wpath[PATH_MAX];
DWORD attrs;
if (name == NULL) {
SetLastError(ERROR_BAD_ARGUMENTS);
} else if ((dir = (DIR *) malloc(sizeof(*dir))) == NULL) {
SetLastError(ERROR_NOT_ENOUGH_MEMORY);
} else {
to_unicode(name, wpath, ARRAY_SIZE(wpath));
attrs = GetFileAttributesW(wpath);
if (attrs != 0xFFFFFFFF &&
((attrs & FILE_ATTRIBUTE_DIRECTORY) == FILE_ATTRIBUTE_DIRECTORY)) {
(void) wcscat(wpath, L"\\*");
dir->handle = FindFirstFileW(wpath, &dir->info);
dir->result.d_name[0] = '\0';
} else {
free(dir);
dir = NULL;
}
}
return dir;
}
static int closedir(DIR *dir) {
int result = 0;
if (dir != NULL) {
if (dir->handle != INVALID_HANDLE_VALUE)
result = FindClose(dir->handle) ? 0 : -1;
free(dir);
} else {
result = -1;
SetLastError(ERROR_BAD_ARGUMENTS);
}
return result;
}
struct dirent * readdir(DIR *dir) {
struct dirent *result = 0;
if (dir) {
if (dir->handle != INVALID_HANDLE_VALUE) {
result = &dir->result;
(void) WideCharToMultiByte(CP_UTF8, 0,
dir->info.cFileName, -1, result->d_name,
sizeof(result->d_name), NULL, NULL);
if (!FindNextFileW(dir->handle, &dir->info)) {
(void) FindClose(dir->handle);
dir->handle = INVALID_HANDLE_VALUE;
}
} else {
SetLastError(ERROR_FILE_NOT_FOUND);
}
} else {
SetLastError(ERROR_BAD_ARGUMENTS);
}
return result;
}
#define set_close_on_exec(fd) // No FD_CLOEXEC on Windows
static int start_thread(struct mg_context *ctx, mg_thread_func_t func,
void *param) {
HANDLE hThread;
ctx = NULL; // Unused
hThread = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE) func, param, 0,
NULL);
if (hThread != NULL) {
(void) CloseHandle(hThread);
}
return hThread == NULL ? -1 : 0;
}
static HANDLE dlopen(const char *dll_name, int flags) {
wchar_t wbuf[PATH_MAX];
flags = 0; // Unused
to_unicode(dll_name, wbuf, ARRAY_SIZE(wbuf));
return LoadLibraryW(wbuf);
}
#if !defined(NO_CGI)
#define SIGKILL 0
static int kill(pid_t pid, int sig_num) {
(void) TerminateProcess(pid, sig_num);
(void) CloseHandle(pid);
return 0;
}
static pid_t spawn_process(struct mg_connection *conn, const char *prog,
char *envblk, char *envp[], int fd_stdin,
int fd_stdout, const char *dir) {
HANDLE me;
char *p, *interp, cmdline[PATH_MAX], buf[PATH_MAX];
FILE *fp;
STARTUPINFOA si;
PROCESS_INFORMATION pi;
envp = NULL; // Unused
(void) memset(&si, 0, sizeof(si));
(void) memset(&pi, 0, sizeof(pi));
// TODO(lsm): redirect CGI errors to the error log file
si.cb = sizeof(si);
si.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW;
si.wShowWindow = SW_HIDE;
me = GetCurrentProcess();
(void) DuplicateHandle(me, (HANDLE) _get_osfhandle(fd_stdin), me,
&si.hStdInput, 0, TRUE, DUPLICATE_SAME_ACCESS);
(void) DuplicateHandle(me, (HANDLE) _get_osfhandle(fd_stdout), me,
&si.hStdOutput, 0, TRUE, DUPLICATE_SAME_ACCESS);
// If CGI file is a script, try to read the interpreter line
interp = conn->ctx->config[CGI_INTERPRETER];
if (interp == NULL) {
buf[2] = '\0';
if ((fp = fopen(cmdline, "r")) != NULL) {
(void) fgets(buf, sizeof(buf), fp);
if (buf[0] != '#' || buf[1] != '!') {
// First line does not start with "#!". Do not set interpreter.
buf[2] = '\0';
} else {
// Trim whitespaces in interpreter name
for (p = &buf[strlen(buf) - 1]; p > buf && isspace(*p); p--) {
*p = '\0';
}
}
(void) fclose(fp);
}
interp = buf + 2;
}
(void) mg_snprintf(conn, cmdline, sizeof(cmdline), "%s%s%s%c%s",
interp, interp[0] == '\0' ? "" : " ", dir, DIRSEP, prog);
DEBUG_TRACE(("Running [%s]", cmdline));
if (CreateProcessA(NULL, cmdline, NULL, NULL, TRUE,
CREATE_NEW_PROCESS_GROUP, envblk, dir, &si, &pi) == 0) {
cry(conn, "%s: CreateProcess(%s): %d",
__func__, cmdline, ERRNO);
pi.hProcess = (pid_t) -1;
} else {
(void) close(fd_stdin);
(void) close(fd_stdout);
}
(void) CloseHandle(si.hStdOutput);
(void) CloseHandle(si.hStdInput);
(void) CloseHandle(pi.hThread);
return (pid_t) pi.hProcess;
}
#endif /* !NO_CGI */
static int set_non_blocking_mode(SOCKET sock) {
unsigned long on = 1;
return ioctlsocket(sock, FIONBIO, &on);
}
#else
static int mg_stat(const char *path, struct mgstat *stp) {
struct stat st;
int ok;
if (stat(path, &st) == 0) {
ok = 0;
stp->size = st.st_size;
stp->mtime = st.st_mtime;
stp->is_directory = S_ISDIR(st.st_mode);
} else {
ok = -1;
}
return ok;
}
static void set_close_on_exec(int fd) {
(void) fcntl(fd, F_SETFD, FD_CLOEXEC);
}
static int start_thread(struct mg_context *ctx, mg_thread_func_t func,
void *param) {
pthread_t thread_id;
pthread_attr_t attr;
int retval;
(void) pthread_attr_init(&attr);
(void) pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
// TODO(lsm): figure out why mongoose dies on Linux if next line is enabled
// (void) pthread_attr_setstacksize(&attr, sizeof(struct mg_connection) * 5);
if ((retval = pthread_create(&thread_id, &attr, func, param)) != 0) {
cry(fc(ctx), "%s: %s", __func__, strerror(retval));
}
return retval;
}
#ifndef NO_CGI
static pid_t spawn_process(struct mg_connection *conn, const char *prog,
char *envblk, char *envp[], int fd_stdin,
int fd_stdout, const char *dir) {
pid_t pid;
const char *interp;
envblk = NULL; // Unused
if ((pid = fork()) == -1) {
// Parent
send_http_error(conn, 500, http_500_error, "fork(): %s", strerror(ERRNO));
} else if (pid == 0) {
// Child
if (chdir(dir) != 0) {
cry(conn, "%s: chdir(%s): %s", __func__, dir, strerror(ERRNO));
} else if (dup2(fd_stdin, 0) == -1) {
cry(conn, "%s: dup2(%d, 0): %s", __func__, fd_stdin, strerror(ERRNO));
} else if (dup2(fd_stdout, 1) == -1) {
cry(conn, "%s: dup2(%d, 1): %s", __func__, fd_stdout, strerror(ERRNO));
} else {
(void) dup2(fd_stdout, 2);
(void) close(fd_stdin);
(void) close(fd_stdout);
// Execute CGI program. No need to lock: new process
interp = conn->ctx->config[CGI_INTERPRETER];
if (interp == NULL) {
(void) execle(prog, prog, NULL, envp);
cry(conn, "%s: execle(%s): %s", __func__, prog, strerror(ERRNO));
} else {
(void) execle(interp, interp, prog, NULL, envp);
cry(conn, "%s: execle(%s %s): %s", __func__, interp, prog,
strerror(ERRNO));
}
}
exit(EXIT_FAILURE);
} else {
// Parent. Close stdio descriptors
(void) close(fd_stdin);
(void) close(fd_stdout);
}
return pid;
}
#endif // !NO_CGI
static int set_non_blocking_mode(SOCKET sock) {
int flags;
flags = fcntl(sock, F_GETFL, 0);
(void) fcntl(sock, F_SETFL, flags | O_NONBLOCK);
return 0;
}
#endif // _WIN32
// Write data to the IO channel - opened file descriptor, socket or SSL
// descriptor. Return number of bytes written.
static int64_t push(FILE *fp, SOCKET sock, SSL *ssl, const char *buf,
int64_t len) {
int64_t sent;
int n, k;
sent = 0;
while (sent < len) {
/* How many bytes we send in this iteration */
k = len - sent > INT_MAX ? INT_MAX : (int) (len - sent);
if (ssl != NULL) {
n = SSL_write(ssl, buf + sent, k);
} else if (fp != NULL) {
n = fwrite(buf + sent, 1, (size_t)k, fp);
if (ferror(fp))
n = -1;
} else {
n = send(sock, buf + sent, (size_t)k, 0);
}
if (n < 0)
break;
sent += n;
}
return sent;
}
// Read from IO channel - opened file descriptor, socket, or SSL descriptor.
// Return number of bytes read.
static int pull(FILE *fp, SOCKET sock, SSL *ssl, char *buf, int len) {
int nread;
if (ssl != NULL) {
nread = SSL_read(ssl, buf, len);
} else if (fp != NULL) {
// Use read() instead of fread(), because if we're reading from the CGI
// pipe, fread() may block until IO buffer is filled up. We cannot afford
// to block and must pass all read bytes immediately to the client.
nread = read(fileno(fp), buf, (size_t) len);
if (ferror(fp))
nread = -1;
} else {
nread = recv(sock, buf, (size_t) len, 0);
}
return nread;
}
int mg_read(struct mg_connection *conn, void *buf, size_t len) {
int n, buffered_len, nread;
const char *buffered;
assert((conn->content_len == -1 && conn->consumed_content == 0) ||
conn->consumed_content <= conn->content_len);
DEBUG_TRACE(("%p %zu %lld %lld", buf, len,
conn->content_len, conn->consumed_content));
nread = 0;
if (conn->consumed_content < conn->content_len) {
// Adjust number of bytes to read.
int64_t to_read = conn->content_len - conn->consumed_content;
if (to_read < (int64_t) len) {
len = (int) to_read;
}
// How many bytes of data we have buffered in the request buffer?
buffered = conn->buf + conn->request_len + conn->consumed_content;
buffered_len = conn->data_len - conn->request_len;
assert(buffered_len >= 0);
// Return buffered data back if we haven't done that yet.
if (conn->consumed_content < (int64_t) buffered_len) {
buffered_len -= (int) conn->consumed_content;
if (len < (size_t) buffered_len) {
buffered_len = len;
}
memcpy(buf, buffered, (size_t)buffered_len);
len -= buffered_len;
buf = (char *) buf + buffered_len;
conn->consumed_content += buffered_len;
nread = buffered_len;
}
// We have returned all buffered data. Read new data from the remote socket.
while (len > 0) {
n = pull(NULL, conn->client.sock, conn->ssl, (char *) buf, (int) len);
if (n <= 0) {
break;
}
buf = (char *) buf + n;
conn->consumed_content += n;
nread += n;
len -= n;
}
}
return nread;
}
int mg_write(struct mg_connection *conn, const void *buf, size_t len) {
return (int) push(NULL, conn->client.sock, conn->ssl,
(const char *) buf, (int64_t) len);
}
int mg_printf(struct mg_connection *conn, const char *fmt, ...) {
char buf[BUFSIZ];
int len;
va_list ap;
va_start(ap, fmt);
len = mg_vsnprintf(conn, buf, sizeof(buf), fmt, ap);
va_end(ap);
return mg_write(conn, buf, (size_t)len);
}
// URL-decode input buffer into destination buffer.
// 0-terminate the destination buffer. Return the length of decoded data.
// form-url-encoded data differs from URI encoding in a way that it
// uses '+' as character for space, see RFC 1866 section 8.2.1
// http://ftp.ics.uci.edu/pub/ietf/html/rfc1866.txt
static size_t url_decode(const char *src, size_t src_len, char *dst,
size_t dst_len, int is_form_url_encoded) {
size_t i, j;
int a, b;
#define HEXTOI(x) (isdigit(x) ? x - '0' : x - 'W')
for (i = j = 0; i < src_len && j < dst_len - 1; i++, j++) {
if (src[i] == '%' &&
isxdigit(* (const unsigned char *) (src + i + 1)) &&
isxdigit(* (const unsigned char *) (src + i + 2))) {
a = tolower(* (const unsigned char *) (src + i + 1));
b = tolower(* (const unsigned char *) (src + i + 2));
dst[j] = (char) ((HEXTOI(a) << 4) | HEXTOI(b));
i += 2;
} else if (is_form_url_encoded && src[i] == '+') {
dst[j] = ' ';
} else {
dst[j] = src[i];
}
}
dst[j] = '\0'; /* Null-terminate the destination */
return j;
}
// Scan given buffer and fetch the value of the given variable.
// It can be specified in query string, or in the POST data.
// Return NULL if the variable not found, or allocated 0-terminated value.
// It is caller's responsibility to free the returned value.
int mg_get_var(const char *buf, size_t buf_len, const char *name,
char *dst, size_t dst_len) {
const char *p, *e, *s;
size_t name_len, len;
name_len = strlen(name);
e = buf + buf_len;
len = -1;
dst[0] = '\0';
// buf is "var1=val1&var2=val2...". Find variable first
for (p = buf; p != NULL && p + name_len < e; p++) {
if ((p == buf || p[-1] == '&') && p[name_len] == '=' &&
!mg_strncasecmp(name, p, name_len)) {
// Point p to variable value
p += name_len + 1;
// Point s to the end of the value
s = (const char *) memchr(p, '&', (size_t)(e - p));
if (s == NULL) {
s = e;
}
assert(s >= p);
// Decode variable into destination buffer
if ((size_t) (s - p) < dst_len) {
len = url_decode(p, (size_t)(s - p), dst, dst_len, 1);
}
break;
}
}
return len;
}
int mg_get_cookie(const struct mg_connection *conn, const char *cookie_name,
char *dst, size_t dst_size) {
const char *s, *p, *end;
int name_len, len = -1;
dst[0] = '\0';
if ((s = mg_get_header(conn, "Cookie")) == NULL) {
return 0;
}
name_len = strlen(cookie_name);
end = s + strlen(s);
for (; (s = strstr(s, cookie_name)) != NULL; s += name_len)
if (s[name_len] == '=') {
s += name_len + 1;
if ((p = strchr(s, ' ')) == NULL)
p = end;
if (p[-1] == ';')
p--;
if (*s == '"' && p[-1] == '"' && p > s + 1) {
s++;
p--;
}
if ((size_t) (p - s) < dst_size) {
len = (p - s) + 1;
mg_strlcpy(dst, s, (size_t)len);
}
break;
}
return len;
}
// Mongoose allows to specify multiple directories to serve,
// like /var/www,/~bob=/home/bob. That means that root directory depends on URI.
// This function returns root dir for given URI.
static int get_document_root(const struct mg_connection *conn,
struct vec *document_root) {
const char *root, *uri;
int len_of_matched_uri;
struct vec uri_vec, path_vec;
uri = conn->request_info.uri;
len_of_matched_uri = 0;
root = next_option(conn->ctx->config[DOCUMENT_ROOT], document_root, NULL);
while ((root = next_option(root, &uri_vec, &path_vec)) != NULL) {
if (memcmp(uri, uri_vec.ptr, uri_vec.len) == 0) {
*document_root = path_vec;
len_of_matched_uri = uri_vec.len;
break;
}
}
return len_of_matched_uri;
}
static void convert_uri_to_file_name(struct mg_connection *conn,
const char *uri, char *buf,
size_t buf_len) {
struct vec vec;
int match_len;
match_len = get_document_root(conn, &vec);
mg_snprintf(conn, buf, buf_len, "%.*s%s", vec.len, vec.ptr, uri + match_len);
#if defined(_WIN32) && !defined(__SYMBIAN32__)
change_slashes_to_backslashes(buf);
#endif /* _WIN32 */
DEBUG_TRACE(("[%s] -> [%s], [%.*s]", uri, buf, (int) vec.len, vec.ptr));
}
static int sslize(struct mg_connection *conn, int (*func)(SSL *)) {
return (conn->ssl = SSL_new(conn->ctx->ssl_ctx)) != NULL &&
SSL_set_fd(conn->ssl, conn->client.sock) == 1 &&
func(conn->ssl) == 1;
}
static struct mg_connection *mg_connect(struct mg_connection *conn,
const char *host, int port, int use_ssl) {
struct mg_connection *newconn = NULL;
struct sockaddr_in sin;
struct hostent *he;
int sock;
if (conn->ctx->ssl_ctx == NULL && use_ssl) {
cry(conn, "%s: SSL is not initialized", __func__);
} else if ((he = gethostbyname(host)) == NULL) {
cry(conn, "%s: gethostbyname(%s): %s", __func__, host, strerror(ERRNO));
} else if ((sock = socket(PF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET) {
cry(conn, "%s: socket: %s", __func__, strerror(ERRNO));
} else {
sin.sin_family = AF_INET;
sin.sin_port = htons((uint16_t) port);
sin.sin_addr = * (struct in_addr *) he->h_addr_list[0];
if (connect(sock, (struct sockaddr *) &sin, sizeof(sin)) != 0) {
cry(conn, "%s: connect(%s:%d): %s", __func__, host, port,
strerror(ERRNO));
closesocket(sock);
} else if ((newconn = (struct mg_connection *)
calloc(1, sizeof(*newconn))) == NULL) {
cry(conn, "%s: calloc: %s", __func__, strerror(ERRNO));
closesocket(sock);
} else {
newconn->client.sock = sock;
newconn->client.rsa.u.sin = sin;
if (use_ssl) {
sslize(newconn, SSL_connect);
}
}
}
return newconn;
}
// Check whether full request is buffered. Return:
// -1 if request is malformed
// 0 if request is not yet fully buffered
// >0 actual request length, including last \r\n\r\n
static int get_request_len(const char *buf, int buflen) {
const char *s, *e;
int len = 0;
DEBUG_TRACE(("buf: %p, len: %d", buf, buflen));
for (s = buf, e = s + buflen - 1; len <= 0 && s < e; s++)
// Control characters are not allowed but >=128 is.
if (!isprint(* (const unsigned char *) s) && *s != '\r' &&
*s != '\n' && * (const unsigned char *) s < 128) {
len = -1;
} else if (s[0] == '\n' && s[1] == '\n') {
len = (int) (s - buf) + 2;
} else if (s[0] == '\n' && &s[1] < e &&
s[1] == '\r' && s[2] == '\n') {
len = (int) (s - buf) + 3;
}
return len;
}
// Convert month to the month number. Return -1 on error, or month number
static int month_number_to_month_name(const char *s) {
size_t i;
for (i = 0; i < ARRAY_SIZE(month_names); i++)
if (!strcmp(s, month_names[i]))
return (int) i;
return -1;
}
// Parse date-time string, and return the corresponding time_t value
static time_t parse_date_string(const char *s) {
time_t current_time;
struct tm tm, *tmp;
char mon[32];
int sec, min, hour, mday, month, year;
(void) memset(&tm, 0, sizeof(tm));
sec = min = hour = mday = month = year = 0;
if (((sscanf(s, "%d/%3s/%d %d:%d:%d",
&mday, mon, &year, &hour, &min, &sec) == 6) ||
(sscanf(s, "%d %3s %d %d:%d:%d",
&mday, mon, &year, &hour, &min, &sec) == 6) ||
(sscanf(s, "%*3s, %d %3s %d %d:%d:%d",
&mday, mon, &year, &hour, &min, &sec) == 6) ||
(sscanf(s, "%d-%3s-%d %d:%d:%d",
&mday, mon, &year, &hour, &min, &sec) == 6)) &&
(month = month_number_to_month_name(mon)) != -1) {
tm.tm_mday = mday;
tm.tm_mon = month;
tm.tm_year = year;
tm.tm_hour = hour;
tm.tm_min = min;
tm.tm_sec = sec;
}
if (tm.tm_year > 1900) {
tm.tm_year -= 1900;
} else if (tm.tm_year < 70) {
tm.tm_year += 100;
}
// Set Daylight Saving Time field
current_time = time(NULL);
tmp = localtime(&current_time);
tm.tm_isdst = tmp->tm_isdst;
return mktime(&tm);
}
// Protect against directory disclosure attack by removing '..',
// excessive '/' and '\' characters
static void remove_double_dots_and_double_slashes(char *s) {
char *p = s;
while (*s != '\0') {
*p++ = *s++;
if (s[-1] == '/' || s[-1] == '\\') {
// Skip all following slashes and backslashes
while (*s == '/' || *s == '\\') {
s++;
}
// Skip all double-dots
while (*s == '.' && s[1] == '.') {
s += 2;
}
}
}
*p = '\0';
}
static const struct {
const char *extension;
size_t ext_len;
const char *mime_type;
size_t mime_type_len;
} builtin_mime_types[] = {
{".html", 5, "text/html", 9},
{".htm", 4, "text/html", 9},
{".shtm", 5, "text/html", 9},
{".shtml", 6, "text/html", 9},
{".css", 4, "text/css", 8},
{".js", 3, "application/x-javascript", 24},
{".ico", 4, "image/x-icon", 12},
{".gif", 4, "image/gif", 9},
{".jpg", 4, "image/jpeg", 10},
{".jpeg", 5, "image/jpeg", 10},
{".png", 4, "image/png", 9},
{".svg", 4, "image/svg+xml", 13},
{".torrent", 8, "application/x-bittorrent", 24},
{".wav", 4, "audio/x-wav", 11},
{".mp3", 4, "audio/x-mp3", 11},
{".mid", 4, "audio/mid", 9},
{".m3u", 4, "audio/x-mpegurl", 15},
{".ram", 4, "audio/x-pn-realaudio", 20},
{".xml", 4, "text/xml", 8},
{".xslt", 5, "application/xml", 15},
{".ra", 3, "audio/x-pn-realaudio", 20},
{".doc", 4, "application/msword", 19},
{".exe", 4, "application/octet-stream", 24},
{".zip", 4, "application/x-zip-compressed", 28},
{".xls", 4, "application/excel", 17},
{".tgz", 4, "application/x-tar-gz", 20},
{".tar", 4, "application/x-tar", 17},
{".gz", 3, "application/x-gunzip", 20},
{".arj", 4, "application/x-arj-compressed", 28},
{".rar", 4, "application/x-arj-compressed", 28},
{".rtf", 4, "application/rtf", 15},
{".pdf", 4, "application/pdf", 15},
{".swf", 4, "application/x-shockwave-flash",29},
{".mpg", 4, "video/mpeg", 10},
{".mpeg", 5, "video/mpeg", 10},
{".asf", 4, "video/x-ms-asf", 14},
{".avi", 4, "video/x-msvideo", 15},
{".bmp", 4, "image/bmp", 9},
{NULL, 0, NULL, 0}
};
// Look at the "path" extension and figure what mime type it has.
// Store mime type in the vector.
static void get_mime_type(struct mg_context *ctx, const char *path,
struct vec *vec) {
struct vec ext_vec, mime_vec;
const char *list, *ext;
size_t i, path_len;
path_len = strlen(path);
// Scan user-defined mime types first, in case user wants to
// override default mime types.
list = ctx->config[EXTRA_MIME_TYPES];
while ((list = next_option(list, &ext_vec, &mime_vec)) != NULL) {
// ext now points to the path suffix
ext = path + path_len - ext_vec.len;
if (mg_strncasecmp(ext, ext_vec.ptr, ext_vec.len) == 0) {
*vec = mime_vec;
return;
}
}
// Now scan built-in mime types
for (i = 0; builtin_mime_types[i].extension != NULL; i++) {
ext = path + (path_len - builtin_mime_types[i].ext_len);
if (path_len > builtin_mime_types[i].ext_len &&
mg_strcasecmp(ext, builtin_mime_types[i].extension) == 0) {
vec->ptr = builtin_mime_types[i].mime_type;
vec->len = builtin_mime_types[i].mime_type_len;
return;
}
}
// Nothing found. Fall back to "text/plain"
vec->ptr = "text/plain";
vec->len = 10;
}
#ifndef HAVE_MD5
typedef struct MD5Context {
uint32_t buf[4];
uint32_t bits[2];
unsigned char in[64];
} MD5_CTX;
#if defined(__BYTE_ORDER) && (__BYTE_ORDER == 1234)
#define byteReverse(buf, len) // Do nothing
#else
static void byteReverse(unsigned char *buf, unsigned longs) {
uint32_t t;
do {
t = (uint32_t) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
((unsigned) buf[1] << 8 | buf[0]);
*(uint32_t *) buf = t;
buf += 4;
} while (--longs);
}
#endif
#define F1(x, y, z) (z ^ (x & (y ^ z)))
#define F2(x, y, z) F1(z, x, y)
#define F3(x, y, z) (x ^ y ^ z)
#define F4(x, y, z) (y ^ (x | ~z))
#define MD5STEP(f, w, x, y, z, data, s) \
( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
// Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
// initialization constants.
static void MD5Init(MD5_CTX *ctx) {
ctx->buf[0] = 0x67452301;
ctx->buf[1] = 0xefcdab89;
ctx->buf[2] = 0x98badcfe;
ctx->buf[3] = 0x10325476;
ctx->bits[0] = 0;
ctx->bits[1] = 0;
}
static void MD5Transform(uint32_t buf[4], uint32_t const in[16]) {
register uint32_t a, b, c, d;
a = buf[0];
b = buf[1];
c = buf[2];
d = buf[3];
MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
buf[0] += a;
buf[1] += b;
buf[2] += c;
buf[3] += d;
}
static void MD5Update(MD5_CTX *ctx, unsigned char const *buf, unsigned len) {
uint32_t t;
t = ctx->bits[0];
if ((ctx->bits[0] = t + ((uint32_t) len << 3)) < t)
ctx->bits[1]++;
ctx->bits[1] += len >> 29;
t = (t >> 3) & 0x3f;
if (t) {
unsigned char *p = (unsigned char *) ctx->in + t;
t = 64 - t;
if (len < t) {
memcpy(p, buf, len);
return;
}
memcpy(p, buf, t);
byteReverse(ctx->in, 16);
MD5Transform(ctx->buf, (uint32_t *) ctx->in);
buf += t;
len -= t;
}
while (len >= 64) {
memcpy(ctx->in, buf, 64);
byteReverse(ctx->in, 16);
MD5Transform(ctx->buf, (uint32_t *) ctx->in);
buf += 64;
len -= 64;
}
memcpy(ctx->in, buf, len);
}
static void MD5Final(unsigned char digest[16], MD5_CTX *ctx) {
unsigned count;
unsigned char *p;
count = (ctx->bits[0] >> 3) & 0x3F;
p = ctx->in + count;
*p++ = 0x80;
count = 64 - 1 - count;
if (count < 8) {
memset(p, 0, count);
byteReverse(ctx->in, 16);
MD5Transform(ctx->buf, (uint32_t *) ctx->in);
memset(ctx->in, 0, 56);
} else {
memset(p, 0, count - 8);
}
byteReverse(ctx->in, 14);
((uint32_t *) ctx->in)[14] = ctx->bits[0];
((uint32_t *) ctx->in)[15] = ctx->bits[1];
MD5Transform(ctx->buf, (uint32_t *) ctx->in);
byteReverse((unsigned char *) ctx->buf, 4);
memcpy(digest, ctx->buf, 16);
memset((char *) ctx, 0, sizeof(*ctx));
}
#endif // !HAVE_MD5
// Stringify binary data. Output buffer must be twice as big as input,
// because each byte takes 2 bytes in string representation
static void bin2str(char *to, const unsigned char *p, size_t len) {
static const char *hex = "0123456789abcdef";
for (; len--; p++) {
*to++ = hex[p[0] >> 4];
*to++ = hex[p[0] & 0x0f];
}
*to = '\0';
}
// Return stringified MD5 hash for list of vectors. Buffer must be 33 bytes.
void mg_md5(char *buf, ...) {
unsigned char hash[16];
const char *p;
va_list ap;
MD5_CTX ctx;
MD5Init(&ctx);
va_start(ap, buf);
while ((p = va_arg(ap, const char *)) != NULL) {
MD5Update(&ctx, (const unsigned char *) p, (unsigned) strlen(p));
}
va_end(ap);
MD5Final(hash, &ctx);
bin2str(buf, hash, sizeof(hash));
}
// Check the user's password, return 1 if OK
static int check_password(const char *method, const char *ha1, const char *uri,
const char *nonce, const char *nc, const char *cnonce,
const char *qop, const char *response) {
char ha2[32 + 1], expected_response[32 + 1];
// Some of the parameters may be NULL
if (method == NULL || nonce == NULL || nc == NULL || cnonce == NULL ||
qop == NULL || response == NULL) {
return 0;
}
// NOTE(lsm): due to a bug in MSIE, we do not compare the URI
// TODO(lsm): check for authentication timeout
if (// strcmp(dig->uri, c->ouri) != 0 ||
strlen(response) != 32
// || now - strtoul(dig->nonce, NULL, 10) > 3600
) {
return 0;
}
mg_md5(ha2, method, ":", uri, NULL);
mg_md5(expected_response, ha1, ":", nonce, ":", nc,
":", cnonce, ":", qop, ":", ha2, NULL);
return mg_strcasecmp(response, expected_response) == 0;
}
// Use the global passwords file, if specified by auth_gpass option,
// or search for .htpasswd in the requested directory.
static FILE *open_auth_file(struct mg_connection *conn, const char *path) {
struct mg_context *ctx = conn->ctx;
char name[PATH_MAX];
const char *p, *e;
struct mgstat st;
FILE *fp;
if (ctx->config[GLOBAL_PASSWORDS_FILE] != NULL) {
// Use global passwords file
fp = mg_fopen(ctx->config[GLOBAL_PASSWORDS_FILE], "r");
if (fp == NULL)
cry(fc(ctx), "fopen(%s): %s",
ctx->config[GLOBAL_PASSWORDS_FILE], strerror(ERRNO));
} else if (!mg_stat(path, &st) && st.is_directory) {
(void) mg_snprintf(conn, name, sizeof(name), "%s%c%s",
path, DIRSEP, PASSWORDS_FILE_NAME);
fp = mg_fopen(name, "r");
} else {
// Try to find .htpasswd in requested directory.
for (p = path, e = p + strlen(p) - 1; e > p; e--)
if (IS_DIRSEP_CHAR(*e))
break;
(void) mg_snprintf(conn, name, sizeof(name), "%.*s%c%s",
(int) (e - p), p, DIRSEP, PASSWORDS_FILE_NAME);
fp = mg_fopen(name, "r");
}
return fp;
}
// Parsed Authorization header
struct ah {
char *user, *uri, *cnonce, *response, *qop, *nc, *nonce;
};
static int parse_auth_header(struct mg_connection *conn, char *buf,
size_t buf_size, struct ah *ah) {
char *name, *value, *s;
const char *auth_header;
if ((auth_header = mg_get_header(conn, "Authorization")) == NULL ||
mg_strncasecmp(auth_header, "Digest ", 7) != 0) {
return 0;
}
// Make modifiable copy of the auth header
(void) mg_strlcpy(buf, auth_header + 7, buf_size);
s = buf;
(void) memset(ah, 0, sizeof(*ah));
// Parse authorization header
for (;;) {
// Gobble initial spaces
while (isspace(* (unsigned char *) s)) {
s++;
}
name = skip_quoted(&s, "=", " ", 0);
/* Value is either quote-delimited, or ends at first comma or space. */
if (s[0] == '\"') {
s++;
value = skip_quoted(&s, "\"", " ", '\\');
if (s[0] == ',') {
s++;
}
} else {
value = skip_quoted(&s, ", ", " ", 0); // IE uses commas, FF uses spaces
}
if (*name == '\0') {
break;
}
if (!strcmp(name, "username")) {
ah->user = value;
} else if (!strcmp(name, "cnonce")) {
ah->cnonce = value;
} else if (!strcmp(name, "response")) {
ah->response = value;
} else if (!strcmp(name, "uri")) {
ah->uri = value;
} else if (!strcmp(name, "qop")) {
ah->qop = value;
} else if (!strcmp(name, "nc")) {
ah->nc = value;
} else if (!strcmp(name, "nonce")) {
ah->nonce = value;
}
}
// CGI needs it as REMOTE_USER
if (ah->user != NULL) {
conn->request_info.remote_user = mg_strdup(ah->user);
} else {
return 0;
}
return 1;
}
// Authorize against the opened passwords file. Return 1 if authorized.
static int authorize(struct mg_connection *conn, FILE *fp) {
struct ah ah;
char line[256], f_user[256], ha1[256], f_domain[256], buf[BUFSIZ];
if (!parse_auth_header(conn, buf, sizeof(buf), &ah)) {
return 0;
}
// Loop over passwords file
while (fgets(line, sizeof(line), fp) != NULL) {
if (sscanf(line, "%[^:]:%[^:]:%s", f_user, f_domain, ha1) != 3) {
continue;
}
if (!strcmp(ah.user, f_user) &&
!strcmp(conn->ctx->config[AUTHENTICATION_DOMAIN], f_domain))
return check_password(
conn->request_info.request_method,
ha1, ah.uri, ah.nonce, ah.nc, ah.cnonce, ah.qop,
ah.response);
}
return 0;
}
// Return 1 if request is authorised, 0 otherwise.
static int check_authorization(struct mg_connection *conn, const char *path) {
FILE *fp;
char fname[PATH_MAX];
struct vec uri_vec, filename_vec;
const char *list;
int authorized;
fp = NULL;
authorized = 1;
list = conn->ctx->config[PROTECT_URI];
while ((list = next_option(list, &uri_vec, &filename_vec)) != NULL) {
if (!memcmp(conn->request_info.uri, uri_vec.ptr, uri_vec.len)) {
(void) mg_snprintf(conn, fname, sizeof(fname), "%.*s",
filename_vec.len, filename_vec.ptr);
if ((fp = mg_fopen(fname, "r")) == NULL) {
cry(conn, "%s: cannot open %s: %s", __func__, fname, strerror(errno));
}
break;
}
}
if (fp == NULL) {
fp = open_auth_file(conn, path);
}
if (fp != NULL) {
authorized = authorize(conn, fp);
(void) fclose(fp);
}
return authorized;
}
static void send_authorization_request(struct mg_connection *conn) {
conn->request_info.status_code = 401;
(void) mg_printf(conn,
"HTTP/1.1 401 Unauthorized\r\n"
"Content-Length: 0\r\n"
"WWW-Authenticate: Digest qop=\"auth\", "
"realm=\"%s\", nonce=\"%lu\"\r\n\r\n",
conn->ctx->config[AUTHENTICATION_DOMAIN],
(unsigned long) time(NULL));
}
static int is_authorized_for_put(struct mg_connection *conn) {
FILE *fp;
int ret = 0;
fp = conn->ctx->config[PUT_DELETE_PASSWORDS_FILE] == NULL ? NULL :
mg_fopen(conn->ctx->config[PUT_DELETE_PASSWORDS_FILE], "r");
if (fp != NULL) {
ret = authorize(conn, fp);
(void) fclose(fp);
}
return ret;
}
int mg_modify_passwords_file(const char *fname, const char *domain,
const char *user, const char *pass) {
int found;
char line[512], u[512], d[512], ha1[33], tmp[PATH_MAX];
FILE *fp, *fp2;
found = 0;
fp = fp2 = NULL;
// Regard empty password as no password - remove user record.
if (pass[0] == '\0') {
pass = NULL;
}
(void) snprintf(tmp, sizeof(tmp), "%s.tmp", fname);
// Create the file if does not exist
if ((fp = mg_fopen(fname, "a+")) != NULL) {
(void) fclose(fp);
}
// Open the given file and temporary file
if ((fp = mg_fopen(fname, "r")) == NULL) {
return 0;
} else if ((fp2 = mg_fopen(tmp, "w+")) == NULL) {
fclose(fp);
return 0;
}
// Copy the stuff to temporary file
while (fgets(line, sizeof(line), fp) != NULL) {
if (sscanf(line, "%[^:]:%[^:]:%*s", u, d) != 2) {
continue;
}
if (!strcmp(u, user) && !strcmp(d, domain)) {
found++;
if (pass != NULL) {
mg_md5(ha1, user, ":", domain, ":", pass, NULL);
fprintf(fp2, "%s:%s:%s\n", user, domain, ha1);
}
} else {
(void) fprintf(fp2, "%s", line);
}
}
// If new user, just add it
if (!found && pass != NULL) {
mg_md5(ha1, user, ":", domain, ":", pass, NULL);
(void) fprintf(fp2, "%s:%s:%s\n", user, domain, ha1);
}
// Close files
(void) fclose(fp);
(void) fclose(fp2);
// Put the temp file in place of real file
(void) mg_remove(fname);
(void) mg_rename(tmp, fname);
return 1;
}
struct de {
struct mg_connection *conn;
char *file_name;
struct mgstat st;
};
static void url_encode(const char *src, char *dst, size_t dst_len) {
static const char *dont_escape = "._-$,;~()";
static const char *hex = "0123456789abcdef";
const char *end = dst + dst_len - 1;
for (; *src != '\0' && dst < end; src++, dst++) {
if (isalnum(*(const unsigned char *) src) ||
strchr(dont_escape, * (const unsigned char *) src) != NULL) {
*dst = *src;
} else if (dst + 2 < end) {
dst[0] = '%';
dst[1] = hex[(* (const unsigned char *) src) >> 4];
dst[2] = hex[(* (const unsigned char *) src) & 0xf];
dst += 2;
}
}
*dst = '\0';
}
static void print_dir_entry(struct de *de) {
char size[64], mod[64], href[PATH_MAX];
if (de->st.is_directory) {
(void) mg_snprintf(de->conn, size, sizeof(size), "%s", "[DIRECTORY]");
} else {
// We use (signed) cast below because MSVC 6 compiler cannot
// convert unsigned __int64 to double. Sigh.
if (de->st.size < 1024) {
(void) mg_snprintf(de->conn, size, sizeof(size),
"%lu", (unsigned long) de->st.size);
} else if (de->st.size < 1024 * 1024) {
(void) mg_snprintf(de->conn, size, sizeof(size),
"%.1fk", (double) de->st.size / 1024.0);
} else if (de->st.size < 1024 * 1024 * 1024) {
(void) mg_snprintf(de->conn, size, sizeof(size),
"%.1fM", (double) de->st.size / 1048576);
} else {
(void) mg_snprintf(de->conn, size, sizeof(size),
"%.1fG", (double) de->st.size / 1073741824);
}
}
(void) strftime(mod, sizeof(mod), "%d-%b-%Y %H:%M", localtime(&de->st.mtime));
url_encode(de->file_name, href, sizeof(href));
de->conn->num_bytes_sent += mg_printf(de->conn,
"<tr><td><a href=\"%s%s%s\">%s%s</a></td>"
"<td>&nbsp;%s</td><td>&nbsp;&nbsp;%s</td></tr>\n",
de->conn->request_info.uri, href, de->st.is_directory ? "/" : "",
de->file_name, de->st.is_directory ? "/" : "", mod, size);
}
// This function is called from send_directory() and used for
// sorting directory entries by size, or name, or modification time.
// On windows, __cdecl specification is needed in case if project is built
// with __stdcall convention. qsort always requires __cdels callback.
static int WINCDECL compare_dir_entries(const void *p1, const void *p2) {
const struct de *a = (const struct de *) p1, *b = (const struct de *) p2;
const char *query_string = a->conn->request_info.query_string;
int cmp_result = 0;
if (query_string == NULL) {
query_string = "na";
}
if (a->st.is_directory && !b->st.is_directory) {
return -1; // Always put directories on top
} else if (!a->st.is_directory && b->st.is_directory) {
return 1; // Always put directories on top
} else if (*query_string == 'n') {
cmp_result = strcmp(a->file_name, b->file_name);
} else if (*query_string == 's') {
cmp_result = a->st.size == b->st.size ? 0 :
a->st.size > b->st.size ? 1 : -1;
} else if (*query_string == 'd') {
cmp_result = a->st.mtime == b->st.mtime ? 0 :
a->st.mtime > b->st.mtime ? 1 : -1;
}
return query_string[1] == 'd' ? -cmp_result : cmp_result;
}
static void handle_directory_request(struct mg_connection *conn,
const char *dir) {
struct dirent *dp;
DIR *dirp;
struct de *entries = NULL;
char path[PATH_MAX];
int i, sort_direction, num_entries = 0, arr_size = 128;
if ((dirp = opendir(dir)) == NULL) {
send_http_error(conn, 500, "Cannot open directory",
"Error: opendir(%s): %s", path, strerror(ERRNO));
return;
}
(void) mg_printf(conn, "%s",
"HTTP/1.1 200 OK\r\n"
"Connection: close\r\n"
"Content-Type: text/html; charset=utf-8\r\n\r\n");
sort_direction = conn->request_info.query_string != NULL &&
conn->request_info.query_string[1] == 'd' ? 'a' : 'd';
while ((dp = readdir(dirp)) != NULL) {
// Do not show current dir and passwords file
if (!strcmp(dp->d_name, ".") ||
!strcmp(dp->d_name, "..") ||
!strcmp(dp->d_name, PASSWORDS_FILE_NAME))
continue;
if (entries == NULL || num_entries >= arr_size) {
arr_size *= 2;
entries = (struct de *) realloc(entries,
arr_size * sizeof(entries[0]));
}
if (entries == NULL) {
closedir(dirp);
send_http_error(conn, 500, "Cannot open directory",
"%s", "Error: cannot allocate memory");
return;
}
mg_snprintf(conn, path, sizeof(path), "%s%c%s", dir, DIRSEP, dp->d_name);
// If we don't memset stat structure to zero, mtime will have
// garbage and strftime() will segfault later on in
// print_dir_entry(). memset is required only if mg_stat()
// fails. For more details, see
// http://code.google.com/p/mongoose/issues/detail?id=79
if (mg_stat(path, &entries[num_entries].st) != 0) {
memset(&entries[num_entries].st, 0, sizeof(entries[num_entries].st));
}
entries[num_entries].conn = conn;
entries[num_entries].file_name = mg_strdup(dp->d_name);
num_entries++;
}
(void) closedir(dirp);
conn->num_bytes_sent += mg_printf(conn,
"<html><head><title>Index of %s</title>"
"<style>th {text-align: left;}</style></head>"
"<body><h1>Index of %s</h1><pre><table cellpadding=\"0\">"
"<tr><th><a href=\"?n%c\">Name</a></th>"
"<th><a href=\"?d%c\">Modified</a></th>"
"<th><a href=\"?s%c\">Size</a></th></tr>"
"<tr><td colspan=\"3\"><hr></td></tr>",
conn->request_info.uri, conn->request_info.uri,
sort_direction, sort_direction, sort_direction);
// Print first entry - link to a parent directory
conn->num_bytes_sent += mg_printf(conn,
"<tr><td><a href=\"%s%s\">%s</a></td>"
"<td>&nbsp;%s</td><td>&nbsp;&nbsp;%s</td></tr>\n",
conn->request_info.uri, "..", "Parent directory", "-", "-");
// Sort and print directory entries
qsort(entries, (size_t)num_entries, sizeof(entries[0]), compare_dir_entries);
for (i = 0; i < num_entries; i++) {
print_dir_entry(&entries[i]);
free(entries[i].file_name);
}
free(entries);
conn->num_bytes_sent += mg_printf(conn, "%s", "</table></body></html>");
conn->request_info.status_code = 200;
}
// Send len bytes from the opened file to the client.
static void send_file_data(struct mg_connection *conn, FILE *fp, int64_t len) {
char buf[BUFSIZ];
int to_read, num_read, num_written;
while (len > 0) {
// Calculate how much to read from the file in the buffer
to_read = sizeof(buf);
if ((int64_t) to_read > len)
to_read = (int) len;
// Read from file, exit the loop on error
if ((num_read = fread(buf, 1, (size_t)to_read, fp)) == 0)
break;
// Send read bytes to the client, exit the loop on error
if ((num_written = mg_write(conn, buf, (size_t)num_read)) != num_read)
break;
// Both read and were successful, adjust counters
conn->num_bytes_sent += num_written;
len -= num_written;
}
}
static int parse_range_header(const char *header, int64_t *a, int64_t *b) {
return sscanf(header, "bytes=%" INT64_FMT "-%" INT64_FMT, a, b);
}
static void handle_file_request(struct mg_connection *conn, const char *path,
struct mgstat *stp) {
char date[64], lm[64], etag[64], range[64];
const char *fmt = "%a, %d %b %Y %H:%M:%S %Z", *msg = "OK", *hdr;
time_t curtime = time(NULL);
int64_t cl, r1, r2;
struct vec mime_vec;
FILE *fp;
int n;
get_mime_type(conn->ctx, path, &mime_vec);
cl = stp->size;
conn->request_info.status_code = 200;
range[0] = '\0';
if ((fp = mg_fopen(path, "rb")) == NULL) {
send_http_error(conn, 500, http_500_error,
"fopen(%s): %s", path, strerror(ERRNO));
return;
}
set_close_on_exec(fileno(fp));
// If Range: header specified, act accordingly
r1 = r2 = 0;
hdr = mg_get_header(conn, "Range");
if (hdr != NULL && (n = parse_range_header(hdr, &r1, &r2)) > 0) {
conn->request_info.status_code = 206;
(void) fseeko(fp, (off_t) r1, SEEK_SET);
cl = n == 2 ? r2 - r1 + 1: cl - r1;
(void) mg_snprintf(conn, range, sizeof(range),
"Content-Range: bytes "
"%" INT64_FMT "-%"
INT64_FMT "/%" INT64_FMT "\r\n",
r1, r1 + cl - 1, stp->size);
msg = "Partial Content";
}
// Prepare Etag, Date, Last-Modified headers
(void) strftime(date, sizeof(date), fmt, localtime(&curtime));
(void) strftime(lm, sizeof(lm), fmt, localtime(&stp->mtime));
(void) mg_snprintf(conn, etag, sizeof(etag), "%lx.%lx",
(unsigned long) stp->mtime, (unsigned long) stp->size);
(void) mg_printf(conn,
"HTTP/1.1 %d %s\r\n"
"Date: %s\r\n"
"Last-Modified: %s\r\n"
"Etag: \"%s\"\r\n"
"Content-Type: %.*s\r\n"
"Content-Length: %" INT64_FMT "\r\n"
"Connection: %s\r\n"
"Accept-Ranges: bytes\r\n"
"%s\r\n",
conn->request_info.status_code, msg, date, lm, etag,
mime_vec.len, mime_vec.ptr, cl, suggest_connection_header(conn), range);
if (strcmp(conn->request_info.request_method, "HEAD") != 0) {
send_file_data(conn, fp, cl);
}
(void) fclose(fp);
}
void mg_send_file(struct mg_connection *conn, const char *path) {
struct mgstat st;
if (mg_stat(path, &st) == 0) {
handle_file_request(conn, path, &st);
} else {
send_http_error(conn, 404, "Not Found", "%s", "File not found");
}
}
// Parse HTTP headers from the given buffer, advance buffer to the point
// where parsing stopped.
static void parse_http_headers(char **buf, struct mg_request_info *ri) {
int i;
for (i = 0; i < (int) ARRAY_SIZE(ri->http_headers); i++) {
ri->http_headers[i].name = skip_quoted(buf, ":", " ", 0);
ri->http_headers[i].value = skip(buf, "\r\n");
if (ri->http_headers[i].name[0] == '\0')
break;
ri->num_headers = i + 1;
}
}
static int is_valid_http_method(const char *method) {
return !strcmp(method, "GET") || !strcmp(method, "POST") ||
!strcmp(method, "HEAD") || !strcmp(method, "CONNECT") ||
!strcmp(method, "PUT") || !strcmp(method, "DELETE");
}
// Parse HTTP request, fill in mg_request_info structure.
static int parse_http_request(char *buf, struct mg_request_info *ri) {
int status = 0;
// RFC says that all initial whitespaces should be ingored
while (*buf != '\0' && isspace(* (unsigned char *) buf)) {
buf++;
}
ri->request_method = skip(&buf, " ");
ri->uri = skip(&buf, " ");
ri->http_version = skip(&buf, "\r\n");
if (is_valid_http_method(ri->request_method) &&
strncmp(ri->http_version, "HTTP/", 5) == 0) {
ri->http_version += 5; /* Skip "HTTP/" */
parse_http_headers(&buf, ri);
status = 1;
}
return status;
}
// Keep reading the input (either opened file descriptor fd, or socket sock,
// or SSL descriptor ssl) into buffer buf, until \r\n\r\n appears in the
// buffer (which marks the end of HTTP request). Buffer buf may already
// have some data. The length of the data is stored in nread.
// Upon every read operation, increase nread by the number of bytes read.
static int read_request(FILE *fp, SOCKET sock, SSL *ssl, char *buf, int bufsiz,
int *nread) {
int n, request_len;
request_len = 0;
while (*nread < bufsiz && request_len == 0) {
n = pull(fp, sock, ssl, buf + *nread, bufsiz - *nread);
if (n <= 0) {
break;
} else {
*nread += n;
request_len = get_request_len(buf, *nread);
}
}
return request_len;
}
// For given directory path, substitute it to valid index file.
// Return 0 if index file has been found, -1 if not found.
// If the file is found, it's stats is returned in stp.
static int substitute_index_file(struct mg_connection *conn, char *path,
size_t path_len, struct mgstat *stp) {
const char *list = conn->ctx->config[INDEX_FILES];
struct mgstat st;
struct vec filename_vec;
size_t n = strlen(path);
int found = 0;
// The 'path' given to us points to the directory. Remove all trailing
// directory separator characters from the end of the path, and
// then append single directory separator character.
while (n > 0 && IS_DIRSEP_CHAR(path[n - 1])) {
n--;
}
path[n] = DIRSEP;
// Traverse index files list. For each entry, append it to the given
// path and see if the file exists. If it exists, break the loop
while ((list = next_option(list, &filename_vec, NULL)) != NULL) {
// Ignore too long entries that may overflow path buffer
if (filename_vec.len > path_len - n)
continue;
// Prepare full path to the index file
(void) mg_strlcpy(path + n + 1, filename_vec.ptr, filename_vec.len + 1);
// Does it exist?
if (mg_stat(path, &st) == 0) {
// Yes it does, break the loop
*stp = st;
found = 1;
break;
}
}
// If no index file exists, restore directory path
if (!found) {
path[n] = '\0';
}
return found;
}
// Return True if we should reply 304 Not Modified.
static int is_not_modified(const struct mg_connection *conn,
const struct mgstat *stp) {
const char *ims = mg_get_header(conn, "If-Modified-Since");
return ims != NULL && stp->mtime <= parse_date_string(ims);
}
static int forward_body_data(struct mg_connection *conn, FILE *fp,
SOCKET sock, SSL *ssl) {
const char *expect, *buffered;
char buf[BUFSIZ];
int to_read, nread, buffered_len, success = 0;
expect = mg_get_header(conn, "Expect");
assert(fp != NULL);
if (conn->content_len == -1) {
send_http_error(conn, 411, "Length Required", "");
} else if (expect != NULL && mg_strcasecmp(expect, "100-continue")) {
send_http_error(conn, 417, "Expectation Failed", "");
} else {
if (expect != NULL) {
(void) mg_printf(conn, "%s", "HTTP/1.1 100 Continue\r\n\r\n");
}
buffered = conn->buf + conn->request_len;
buffered_len = conn->data_len - conn->request_len;
assert(buffered_len >= 0);
assert(conn->consumed_content == 0);
if (buffered_len > 0) {
if ((int64_t) buffered_len > conn->content_len) {
buffered_len = (int) conn->content_len;
}
push(fp, sock, ssl, buffered, (int64_t) buffered_len);
conn->consumed_content += buffered_len;
}
while (conn->consumed_content < conn->content_len) {
to_read = sizeof(buf);
if ((int64_t) to_read > conn->content_len - conn->consumed_content) {
to_read = (int) (conn->content_len - conn->consumed_content);
}
nread = pull(NULL, conn->client.sock, conn->ssl, buf, to_read);
if (nread <= 0 || push(fp, sock, ssl, buf, nread) != nread) {
break;
}
conn->consumed_content += nread;
}
if (conn->consumed_content == conn->content_len) {
success = 1;
}
// Each error code path in this function must send an error
if (!success) {
send_http_error(conn, 577, http_500_error, "");
}
}
return success;
}
#if !defined(NO_CGI)
// This structure helps to create an environment for the spawned CGI program.
// Environment is an array of "VARIABLE=VALUE\0" ASCIIZ strings,
// last element must be NULL.
// However, on Windows there is a requirement that all these VARIABLE=VALUE\0
// strings must reside in a contiguous buffer. The end of the buffer is
// marked by two '\0' characters.
// We satisfy both worlds: we create an envp array (which is vars), all
// entries are actually pointers inside buf.
struct cgi_env_block {
struct mg_connection *conn;
char buf[CGI_ENVIRONMENT_SIZE]; // Environment buffer
int len; // Space taken
char *vars[MAX_CGI_ENVIR_VARS]; // char **envp
int nvars; // Number of variables
};
// Append VARIABLE=VALUE\0 string to the buffer, and add a respective
// pointer into the vars array.
static char *addenv(struct cgi_env_block *block, const char *fmt, ...) {
int n, space;
char *added;
va_list ap;
// Calculate how much space is left in the buffer
space = sizeof(block->buf) - block->len - 2;
assert(space >= 0);
// Make a pointer to the free space int the buffer
added = block->buf + block->len;
// Copy VARIABLE=VALUE\0 string into the free space
va_start(ap, fmt);
n = mg_vsnprintf(block->conn, added, (size_t) space, fmt, ap);
va_end(ap);
// Make sure we do not overflow buffer and the envp array
if (n > 0 && n < space &&
block->nvars < (int) ARRAY_SIZE(block->vars) - 2) {
// Append a pointer to the added string into the envp array
block->vars[block->nvars++] = block->buf + block->len;
// Bump up used length counter. Include \0 terminator
block->len += n + 1;
}
return added;
}
static void prepare_cgi_environment(struct mg_connection *conn,
const char *prog,
struct cgi_env_block *blk) {
const char *s, *slash;
struct vec var_vec, root;
char *p;
int i;
blk->len = blk->nvars = 0;
blk->conn = conn;
get_document_root(conn, &root);
addenv(blk, "SERVER_NAME=%s", conn->ctx->config[AUTHENTICATION_DOMAIN]);
addenv(blk, "SERVER_ROOT=%.*s", root.len, root.ptr);
addenv(blk, "DOCUMENT_ROOT=%.*s", root.len, root.ptr);
// Prepare the environment block
addenv(blk, "%s", "GATEWAY_INTERFACE=CGI/1.1");
addenv(blk, "%s", "SERVER_PROTOCOL=HTTP/1.1");
addenv(blk, "%s", "REDIRECT_STATUS=200"); // For PHP
addenv(blk, "SERVER_PORT=%d", ntohs(conn->client.lsa.u.sin.sin_port));
addenv(blk, "REQUEST_METHOD=%s", conn->request_info.request_method);
addenv(blk, "REMOTE_ADDR=%s",
inet_ntoa(conn->client.rsa.u.sin.sin_addr));
addenv(blk, "REMOTE_PORT=%d", conn->request_info.remote_port);
addenv(blk, "REQUEST_URI=%s", conn->request_info.uri);
// SCRIPT_NAME
assert(conn->request_info.uri[0] == '/');
slash = strrchr(conn->request_info.uri, '/');
if ((s = strrchr(prog, '/')) == NULL)
s = prog;
addenv(blk, "SCRIPT_NAME=%.*s%s", slash - conn->request_info.uri,
conn->request_info.uri, s);
addenv(blk, "SCRIPT_FILENAME=%s", prog);
addenv(blk, "PATH_TRANSLATED=%s", prog);
addenv(blk, "HTTPS=%s", conn->ssl == NULL ? "off" : "on");
if ((s = mg_get_header(conn, "Content-Type")) != NULL)
addenv(blk, "CONTENT_TYPE=%s", s);
if (conn->request_info.query_string != NULL)
addenv(blk, "QUERY_STRING=%s", conn->request_info.query_string);
if ((s = mg_get_header(conn, "Content-Length")) != NULL)
addenv(blk, "CONTENT_LENGTH=%s", s);
if ((s = getenv("PATH")) != NULL)
addenv(blk, "PATH=%s", s);
#if defined(_WIN32)
if ((s = getenv("COMSPEC")) != NULL)
addenv(blk, "COMSPEC=%s", s);
if ((s = getenv("SYSTEMROOT")) != NULL)
addenv(blk, "SYSTEMROOT=%s", s);
#else
if ((s = getenv("LD_LIBRARY_PATH")) != NULL)
addenv(blk, "LD_LIBRARY_PATH=%s", s);
#endif /* _WIN32 */
if ((s = getenv("PERLLIB")) != NULL)
addenv(blk, "PERLLIB=%s", s);
if (conn->request_info.remote_user != NULL) {
addenv(blk, "REMOTE_USER=%s", conn->request_info.remote_user);
addenv(blk, "%s", "AUTH_TYPE=Digest");
}
// Add all headers as HTTP_* variables
for (i = 0; i < conn->request_info.num_headers; i++) {
p = addenv(blk, "HTTP_%s=%s",
conn->request_info.http_headers[i].name,
conn->request_info.http_headers[i].value);
// Convert variable name into uppercase, and change - to _
for (; *p != '=' && *p != '\0'; p++) {
if (*p == '-')
*p = '_';
*p = (char) toupper(* (unsigned char *) p);
}
}
// Add user-specified variables
s = conn->ctx->config[CGI_ENVIRONMENT];
while ((s = next_option(s, &var_vec, NULL)) != NULL) {
addenv(blk, "%.*s", var_vec.len, var_vec.ptr);
}
blk->vars[blk->nvars++] = NULL;
blk->buf[blk->len++] = '\0';
assert(blk->nvars < (int) ARRAY_SIZE(blk->vars));
assert(blk->len > 0);
assert(blk->len < (int) sizeof(blk->buf));
}
static void handle_cgi_request(struct mg_connection *conn, const char *prog) {
int headers_len, data_len, i, fd_stdin[2], fd_stdout[2];
const char *status;
char buf[BUFSIZ], *pbuf, dir[PATH_MAX], *p;
struct mg_request_info ri;
struct cgi_env_block blk;
FILE *in, *out;
pid_t pid;
prepare_cgi_environment(conn, prog, &blk);
// CGI must be executed in its own directory. 'dir' must point to the
// directory containing executable program, 'p' must point to the
// executable program name relative to 'dir'.
(void) mg_snprintf(conn, dir, sizeof(dir), "%s", prog);
if ((p = strrchr(dir, DIRSEP)) != NULL) {
*p++ = '\0';
} else {
dir[0] = '.', dir[1] = '\0';
p = (char *) prog;
}
pid = (pid_t) -1;
fd_stdin[0] = fd_stdin[1] = fd_stdout[0] = fd_stdout[1] = -1;
in = out = NULL;
if (pipe(fd_stdin) != 0 || pipe(fd_stdout) != 0) {
send_http_error(conn, 500, http_500_error,
"Cannot create CGI pipe: %s", strerror(ERRNO));
goto done;
} else if ((pid = spawn_process(conn, p, blk.buf, blk.vars,
fd_stdin[0], fd_stdout[1], dir)) == (pid_t) -1) {
goto done;
} else if ((in = fdopen(fd_stdin[1], "wb")) == NULL ||
(out = fdopen(fd_stdout[0], "rb")) == NULL) {
send_http_error(conn, 500, http_500_error,
"fopen: %s", strerror(ERRNO));
goto done;
}
setbuf(in, NULL);
setbuf(out, NULL);
// spawn_process() must close those!
// If we don't mark them as closed, close() attempt before
// return from this function throws an exception on Windows.
// Windows does not like when closed descriptor is closed again.
fd_stdin[0] = fd_stdout[1] = -1;
// Send POST data to the CGI process if needed
if (!strcmp(conn->request_info.request_method, "POST") &&
!forward_body_data(conn, in, INVALID_SOCKET, NULL)) {
goto done;
}
// Now read CGI reply into a buffer. We need to set correct
// status code, thus we need to see all HTTP headers first.
// Do not send anything back to client, until we buffer in all
// HTTP headers.
data_len = 0;
headers_len = read_request(out, INVALID_SOCKET, NULL,
buf, sizeof(buf), &data_len);
if (headers_len <= 0) {
send_http_error(conn, 500, http_500_error,
"CGI program sent malformed HTTP headers: [%.*s]",
data_len, buf);
goto done;
}
pbuf = buf;
buf[headers_len - 1] = '\0';
parse_http_headers(&pbuf, &ri);
// Make up and send the status line
status = get_header(&ri, "Status");
conn->request_info.status_code = status == NULL ? 200 : atoi(status);
(void) mg_printf(conn, "HTTP/1.1 %d OK\r\n", conn->request_info.status_code);
// Send headers
for (i = 0; i < ri.num_headers; i++) {
mg_printf(conn, "%s: %s\r\n",
ri.http_headers[i].name, ri.http_headers[i].value);
}
(void) mg_write(conn, "\r\n", 2);
// Send chunk of data that may be read after the headers
conn->num_bytes_sent += mg_write(conn, buf + headers_len,
(size_t)(data_len - headers_len));
// Read the rest of CGI output and send to the client
send_file_data(conn, out, INT64_MAX);
done:
if (pid != (pid_t) -1) {
kill(pid, SIGKILL);
}
if (fd_stdin[0] != -1) {
(void) close(fd_stdin[0]);
}
if (fd_stdout[1] != -1) {
(void) close(fd_stdout[1]);
}
if (in != NULL) {
(void) fclose(in);
} else if (fd_stdin[1] != -1) {
(void) close(fd_stdin[1]);
}
if (out != NULL) {
(void) fclose(out);
} else if (fd_stdout[0] != -1) {
(void) close(fd_stdout[0]);
}
}
#endif // !NO_CGI
// For a given PUT path, create all intermediate subdirectories
// for given path. Return 0 if the path itself is a directory,
// or -1 on error, 1 if OK.
static int put_dir(const char *path) {
char buf[PATH_MAX];
const char *s, *p;
struct mgstat st;
size_t len;
for (s = p = path + 2; (p = strchr(s, '/')) != NULL; s = ++p) {
len = p - path;
assert(len < sizeof(buf));
(void) memcpy(buf, path, len);
buf[len] = '\0';
// Try to create intermediate directory
if (mg_stat(buf, &st) == -1 && mg_mkdir(buf, 0755) != 0) {
return -1;
}
// Is path itself a directory?
if (p[1] == '\0') {
return 0;
}
}
return 1;
}
static void put_file(struct mg_connection *conn, const char *path) {
struct mgstat st;
const char *range;
int64_t r1, r2;
FILE *fp;
int rc;
conn->request_info.status_code = mg_stat(path, &st) == 0 ? 200 : 201;
if ((rc = put_dir(path)) == 0) {
mg_printf(conn, "HTTP/1.1 %d OK\r\n\r\n", conn->request_info.status_code);
} else if (rc == -1) {
send_http_error(conn, 500, http_500_error,
"put_dir(%s): %s", path, strerror(ERRNO));
} else if ((fp = mg_fopen(path, "wb+")) == NULL) {
send_http_error(conn, 500, http_500_error,
"fopen(%s): %s", path, strerror(ERRNO));
} else {
set_close_on_exec(fileno(fp));
range = mg_get_header(conn, "Content-Range");
r1 = r2 = 0;
if (range != NULL && parse_range_header(range, &r1, &r2) > 0) {
conn->request_info.status_code = 206;
// TODO(lsm): handle seek error
(void) fseeko(fp, (off_t) r1, SEEK_SET);
}
if (forward_body_data(conn, fp, INVALID_SOCKET, NULL))
(void) mg_printf(conn, "HTTP/1.1 %d OK\r\n\r\n",
conn->request_info.status_code);
(void) fclose(fp);
}
}
static void send_ssi_file(struct mg_connection *, const char *, FILE *, int);
static void do_ssi_include(struct mg_connection *conn, const char *ssi,
char *tag, int include_level) {
char file_name[BUFSIZ], path[PATH_MAX], *p;
struct vec root;
int is_ssi;
FILE *fp;
get_document_root(conn, &root);
// sscanf() is safe here, since send_ssi_file() also uses buffer
// of size BUFSIZ to get the tag. So strlen(tag) is always < BUFSIZ.
if (sscanf(tag, " virtual=\"%[^\"]\"", file_name) == 1) {
// File name is relative to the webserver root
(void) mg_snprintf(conn, path, sizeof(path), "%.*s%c%s",
root.len, root.ptr, DIRSEP, file_name);
} else if (sscanf(tag, " file=\"%[^\"]\"", file_name) == 1) {
// File name is relative to the webserver working directory
// or it is absolute system path
(void) mg_snprintf(conn, path, sizeof(path), "%s", file_name);
} else if (sscanf(tag, " \"%[^\"]\"", file_name) == 1) {
// File name is relative to the currect document
(void) mg_snprintf(conn, path, sizeof(path), "%s", ssi);
if ((p = strrchr(path, DIRSEP)) != NULL) {
p[1] = '\0';
}
(void) mg_snprintf(conn, path + strlen(path),
sizeof(path) - strlen(path), "%s", file_name);
} else {
cry(conn, "Bad SSI #include: [%s]", tag);
return;
}
if ((fp = mg_fopen(path, "rb")) == NULL) {
cry(conn, "Cannot open SSI #include: [%s]: fopen(%s): %s",
tag, path, strerror(ERRNO));
} else {
set_close_on_exec(fileno(fp));
is_ssi = match_extension(path, conn->ctx->config[SSI_EXTENSIONS]);
if (is_ssi) {
send_ssi_file(conn, path, fp, include_level + 1);
} else {
send_file_data(conn, fp, INT64_MAX);
}
(void) fclose(fp);
}
}
#if !defined(NO_POPEN)
static void do_ssi_exec(struct mg_connection *conn, char *tag) {
char cmd[BUFSIZ];
FILE *fp;
if (sscanf(tag, " \"%[^\"]\"", cmd) != 1) {
cry(conn, "Bad SSI #exec: [%s]", tag);
} else if ((fp = popen(cmd, "r")) == NULL) {
cry(conn, "Cannot SSI #exec: [%s]: %s", cmd, strerror(ERRNO));
} else {
send_file_data(conn, fp, INT64_MAX);
(void) pclose(fp);
}
}
#endif // !NO_POPEN
static void send_ssi_file(struct mg_connection *conn, const char *path,
FILE *fp, int include_level) {
char buf[BUFSIZ];
int ch, len, in_ssi_tag;
if (include_level > 10) {
cry(conn, "SSI #include level is too deep (%s)", path);
return;
}
in_ssi_tag = 0;
len = 0;
while ((ch = fgetc(fp)) != EOF) {
if (in_ssi_tag && ch == '>') {
in_ssi_tag = 0;
buf[len++] = (char) ch;
buf[len] = '\0';
assert(len <= (int) sizeof(buf));
if (len < 6 || memcmp(buf, "<!--#", 5) != 0) {
// Not an SSI tag, pass it
(void) mg_write(conn, buf, (size_t)len);
} else {
if (!memcmp(buf + 5, "include", 7)) {
do_ssi_include(conn, path, buf + 12, include_level);
#if !defined(NO_POPEN)
} else if (!memcmp(buf + 5, "exec", 4)) {
do_ssi_exec(conn, buf + 9);
#endif // !NO_POPEN
} else {
cry(conn, "%s: unknown SSI " "command: \"%s\"", path, buf);
}
}
len = 0;
} else if (in_ssi_tag) {
if (len == 5 && memcmp(buf, "<!--#", 5) != 0) {
// Not an SSI tag
in_ssi_tag = 0;
} else if (len == (int) sizeof(buf) - 2) {
cry(conn, "%s: SSI tag is too large", path);
len = 0;
}
buf[len++] = ch & 0xff;
} else if (ch == '<') {
in_ssi_tag = 1;
if (len > 0) {
(void) mg_write(conn, buf, (size_t)len);
}
len = 0;
buf[len++] = ch & 0xff;
} else {
buf[len++] = ch & 0xff;
if (len == (int) sizeof(buf)) {
(void) mg_write(conn, buf, (size_t)len);
len = 0;
}
}
}
// Send the rest of buffered data
if (len > 0) {
(void) mg_write(conn, buf, (size_t)len);
}
}
static void handle_ssi_file_request(struct mg_connection *conn,
const char *path) {
FILE *fp;
if ((fp = mg_fopen(path, "rb")) == NULL) {
send_http_error(conn, 500, http_500_error, "fopen(%s): %s", path,
strerror(ERRNO));
} else {
set_close_on_exec(fileno(fp));
mg_printf(conn, "HTTP/1.1 200 OK\r\n"
"Content-Type: text/html\r\nConnection: %s\r\n\r\n",
suggest_connection_header(conn));
send_ssi_file(conn, path, fp, 0);
(void) fclose(fp);
}
}
// This is the heart of the Mongoose's logic.
// This function is called when the request is read, parsed and validated,
// and Mongoose must decide what action to take: serve a file, or
// a directory, or call embedded function, etcetera.
static void handle_request(struct mg_connection *conn) {
struct mg_request_info *ri = &conn->request_info;
char path[PATH_MAX];
int uri_len;
struct mgstat st;
if ((conn->request_info.query_string = strchr(ri->uri, '?')) != NULL) {
* conn->request_info.query_string++ = '\0';
}
uri_len = strlen(ri->uri);
(void) url_decode(ri->uri, (size_t)uri_len, ri->uri, (size_t)(uri_len + 1), 0);
remove_double_dots_and_double_slashes(ri->uri);
convert_uri_to_file_name(conn, ri->uri, path, sizeof(path));
DEBUG_TRACE(("%s", ri->uri));
if (!check_authorization(conn, path)) {
send_authorization_request(conn);
} else if (call_user(conn, MG_NEW_REQUEST) != NULL) {
// Do nothing, callback has served the request
} else if (strstr(path, PASSWORDS_FILE_NAME)) {
// Do not allow to view passwords files
send_http_error(conn, 403, "Forbidden", "Access Forbidden");
} else if (conn->ctx->config[DOCUMENT_ROOT] == NULL) {
send_http_error(conn, 404, "Not Found", "Not Found");
} else if ((!strcmp(ri->request_method, "PUT") ||
!strcmp(ri->request_method, "DELETE")) &&
(conn->ctx->config[PUT_DELETE_PASSWORDS_FILE] == NULL ||
!is_authorized_for_put(conn))) {
send_authorization_request(conn);
} else if (!strcmp(ri->request_method, "PUT")) {
put_file(conn, path);
} else if (!strcmp(ri->request_method, "DELETE")) {
if (mg_remove(path) == 0) {
send_http_error(conn, 200, "OK", "");
} else {
send_http_error(conn, 500, http_500_error, "remove(%s): %s", path,
strerror(ERRNO));
}
} else if (mg_stat(path, &st) != 0) {
send_http_error(conn, 404, "Not Found", "%s", "File not found");
} else if (st.is_directory && ri->uri[uri_len - 1] != '/') {
(void) mg_printf(conn,
"HTTP/1.1 301 Moved Permanently\r\n"
"Location: %s/\r\n\r\n", ri->uri);
} else if (st.is_directory &&
!substitute_index_file(conn, path, sizeof(path), &st)) {
if (!mg_strcasecmp(conn->ctx->config[ENABLE_DIRECTORY_LISTING], "yes")) {
handle_directory_request(conn, path);
} else {
send_http_error(conn, 403, "Directory Listing Denied",
"Directory listing denied");
}
} else if (match_extension(path, conn->ctx->config[CGI_EXTENSIONS])) {
if (strcmp(ri->request_method, "POST") &&
strcmp(ri->request_method, "GET")) {
send_http_error(conn, 501, "Not Implemented",
"Method %s is not implemented", ri->request_method);
} else {
handle_cgi_request(conn, path);
}
} else if (match_extension(path, conn->ctx->config[SSI_EXTENSIONS])) {
handle_ssi_file_request(conn, path);
} else if (is_not_modified(conn, &st)) {
send_http_error(conn, 304, "Not Modified", "");
} else {
handle_file_request(conn, path, &st);
}
}
static void close_all_listening_sockets(struct mg_context *ctx) {
struct socket *sp, *tmp;
for (sp = ctx->listening_sockets; sp != NULL; sp = tmp) {
tmp = sp->next;
(void) closesocket(sp->sock);
free(sp);
}
}
// Valid listening port specification is: [ip_address:]port[s|p]
// Examples: 80, 443s, 127.0.0.1:3128p, 1.2.3.4:8080sp
static int parse_port_string(const struct vec *vec, struct socket *so) {
struct usa *usa = &so->lsa;
int a, b, c, d, port, len;
// MacOS needs that. If we do not zero it, subsequent bind() will fail.
memset(so, 0, sizeof(*so));
if (sscanf(vec->ptr, "%d.%d.%d.%d:%d%n", &a, &b, &c, &d, &port, &len) == 5) {
// IP address to bind to is specified
usa->u.sin.sin_addr.s_addr = htonl((a << 24) | (b << 16) | (c << 8) | d);
} else if (sscanf(vec->ptr, "%d%n", &port, &len) == 1) {
// Only port number is specified. Bind to all addresses
usa->u.sin.sin_addr.s_addr = htonl(INADDR_ANY);
} else {
return 0;
}
assert(len > 0 && len <= (int) vec->len);
if (strchr("sp,", vec->ptr[len]) == NULL) {
return 0;
}
so->is_ssl = vec->ptr[len] == 's';
so->is_proxy = vec->ptr[len] == 'p';
usa->len = sizeof(usa->u.sin);
usa->u.sin.sin_family = AF_INET;
usa->u.sin.sin_port = htons((uint16_t) port);
return 1;
}
static int set_ports_option(struct mg_context *ctx) {
const char *list = ctx->config[LISTENING_PORTS];
int on = 1, success = 1;
SOCKET sock;
struct vec vec;
struct socket so, *listener;
while (success && (list = next_option(list, &vec, NULL)) != NULL) {
if (!parse_port_string(&vec, &so)) {
cry(fc(ctx), "%s: %.*s: invalid port spec. Expecting list of: %s",
__func__, vec.len, vec.ptr, "[IP_ADDRESS:]PORT[s|p]");
success = 0;
} else if (so.is_ssl && ctx->ssl_ctx == NULL) {
cry(fc(ctx), "Cannot add SSL socket, is -ssl_cert option set?");
success = 0;
} else if ((sock = socket(PF_INET, SOCK_STREAM, 6)) == INVALID_SOCKET ||
#if !defined(_WIN32)
// On Windows, SO_REUSEADDR is recommended only for
// broadcast UDP sockets
setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &on,
sizeof(on)) != 0 ||
#endif // !_WIN32
// Set TCP keep-alive. This is needed because if HTTP-level
// keep-alive is enabled, and client resets the connection,
// server won't get TCP FIN or RST and will keep the connection
// open forever. With TCP keep-alive, next keep-alive
// handshake will figure out that the client is down and
// will close the server end.
// Thanks to Igor Klopov who suggested the patch.
setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, &on,
sizeof(on)) != 0 ||
bind(sock, &so.lsa.u.sa, so.lsa.len) != 0 ||
listen(sock, 100) != 0) {
closesocket(sock);
cry(fc(ctx), "%s: cannot bind to %.*s: %s", __func__,
vec.len, vec.ptr, strerror(ERRNO));
success = 0;
} else if ((listener = (struct socket *)
calloc(1, sizeof(*listener))) == NULL) {
closesocket(sock);
cry(fc(ctx), "%s: %s", __func__, strerror(ERRNO));
success = 0;
} else {
*listener = so;
listener->sock = sock;
set_close_on_exec(listener->sock);
listener->next = ctx->listening_sockets;
ctx->listening_sockets = listener;
}
}
if (!success) {
close_all_listening_sockets(ctx);
}
return success;
}
static void log_header(const struct mg_connection *conn, const char *header,
FILE *fp) {
const char *header_value;
if ((header_value = mg_get_header(conn, header)) == NULL) {
(void) fprintf(fp, "%s", " -");
} else {
(void) fprintf(fp, " \"%s\"", header_value);
}
}
static void log_access(const struct mg_connection *conn) {
const struct mg_request_info *ri;
FILE *fp;
char date[64];
fp = conn->ctx->config[ACCESS_LOG_FILE] == NULL ? NULL :
mg_fopen(conn->ctx->config[ACCESS_LOG_FILE], "a+");
if (fp == NULL)
return;
(void) strftime(date, sizeof(date), "%d/%b/%Y:%H:%M:%S %z",
localtime(&conn->birth_time));
ri = &conn->request_info;
flockfile(fp);
(void) fprintf(fp,
"%s - %s [%s] \"%s %s HTTP/%s\" %d %" INT64_FMT,
inet_ntoa(conn->client.rsa.u.sin.sin_addr),
ri->remote_user == NULL ? "-" : ri->remote_user,
date,
ri->request_method ? ri->request_method : "-",
ri->uri ? ri->uri : "-",
ri->http_version,
conn->request_info.status_code, conn->num_bytes_sent);
log_header(conn, "Referer", fp);
log_header(conn, "User-Agent", fp);
(void) fputc('\n', fp);
(void) fflush(fp);
funlockfile(fp);
(void) fclose(fp);
}
static int isbyte(int n) {
return n >= 0 && n <= 255;
}
// Verify given socket address against the ACL.
// Return -1 if ACL is malformed, 0 if address is disallowed, 1 if allowed.
static int check_acl(struct mg_context *ctx, const struct usa *usa) {
int a, b, c, d, n, mask, allowed;
char flag;
uint32_t acl_subnet, acl_mask, remote_ip;
struct vec vec;
const char *list = ctx->config[ACCESS_CONTROL_LIST];
if (list == NULL) {
return 1;
}
(void) memcpy(&remote_ip, &usa->u.sin.sin_addr, sizeof(remote_ip));
// If any ACL is set, deny by default
allowed = '-';
while ((list = next_option(list, &vec, NULL)) != NULL) {
mask = 32;
if (sscanf(vec.ptr, "%c%d.%d.%d.%d%n", &flag, &a, &b, &c, &d, &n) != 5) {
cry(fc(ctx), "%s: subnet must be [+|-]x.x.x.x[/x]", __func__);
return -1;
} else if (flag != '+' && flag != '-') {
cry(fc(ctx), "%s: flag must be + or -: [%s]", __func__, vec.ptr);
return -1;
} else if (!isbyte(a)||!isbyte(b)||!isbyte(c)||!isbyte(d)) {
cry(fc(ctx), "%s: bad ip address: [%s]", __func__, vec.ptr);
return -1;
} else if (sscanf(vec.ptr + n, "/%d", &mask) == 0) {
// Do nothing, no mask specified
} else if (mask < 0 || mask > 32) {
cry(fc(ctx), "%s: bad subnet mask: %d [%s]", __func__, n, vec.ptr);
return -1;
}
acl_subnet = (a << 24) | (b << 16) | (c << 8) | d;
acl_mask = mask ? 0xffffffffU << (32 - mask) : 0;
if (acl_subnet == (ntohl(remote_ip) & acl_mask)) {
allowed = flag;
}
}
return allowed == '+';
}
static void add_to_set(SOCKET fd, fd_set *set, int *max_fd) {
FD_SET(fd, set);
if (fd > (SOCKET) *max_fd) {
*max_fd = (int) fd;
}
}
#if !defined(_WIN32)
static int set_uid_option(struct mg_context *ctx) {
struct passwd *pw;
const char *uid = ctx->config[RUN_AS_USER];
int success = 0;
if (uid == NULL) {
success = 1;
} else {
if ((pw = getpwnam(uid)) == NULL) {
cry(fc(ctx), "%s: unknown user [%s]", __func__, uid);
} else if (setgid(pw->pw_gid) == -1) {
cry(fc(ctx), "%s: setgid(%s): %s", __func__, uid, strerror(errno));
} else if (setuid(pw->pw_uid) == -1) {
cry(fc(ctx), "%s: setuid(%s): %s", __func__, uid, strerror(errno));
} else {
success = 1;
}
}
return success;
}
#endif // !_WIN32
#if !defined(NO_SSL)
static pthread_mutex_t *ssl_mutexes;
static void ssl_locking_callback(int mode, int mutex_num, const char *file,
int line) {
line = 0; // Unused
file = NULL; // Unused
if (mode & CRYPTO_LOCK) {
(void) pthread_mutex_lock(&ssl_mutexes[mutex_num]);
} else {
(void) pthread_mutex_unlock(&ssl_mutexes[mutex_num]);
}
}
static unsigned long ssl_id_callback(void) {
return (unsigned long) pthread_self();
}
#if !defined(NO_SSL_DL)
static int load_dll(struct mg_context *ctx, const char *dll_name,
struct ssl_func *sw) {
union {void *p; void (*fp)(void);} u;
void *dll_handle;
struct ssl_func *fp;
if ((dll_handle = dlopen(dll_name, RTLD_LAZY)) == NULL) {
cry(fc(ctx), "%s: cannot load %s", __func__, dll_name);
return 0;
}
for (fp = sw; fp->name != NULL; fp++) {
#ifdef _WIN32
// GetProcAddress() returns pointer to function
u.fp = (void (*)(void)) dlsym(dll_handle, fp->name);
#else
// dlsym() on UNIX returns void *. ISO C forbids casts of data pointers to
// function pointers. We need to use a union to make a cast.
u.p = dlsym(dll_handle, fp->name);
#endif /* _WIN32 */
if (u.fp == NULL) {
cry(fc(ctx), "%s: %s: cannot find %s", __func__, dll_name, fp->name);
return 0;
} else {
fp->ptr = u.fp;
}
}
return 1;
}
#endif // NO_SSL_DL
// Dynamically load SSL library. Set up ctx->ssl_ctx pointer.
static int set_ssl_option(struct mg_context *ctx) {
struct mg_request_info request_info;
SSL_CTX *CTX;
int i, size;
const char *pem = ctx->config[SSL_CERTIFICATE];
const char *chain = ctx->config[SSL_CHAIN_FILE];
if (pem == NULL) {
return 1;
}
#if !defined(NO_SSL_DL)
if (!load_dll(ctx, SSL_LIB, ssl_sw) ||
!load_dll(ctx, CRYPTO_LIB, crypto_sw)) {
return 0;
}
#endif // NO_SSL_DL
// Initialize SSL crap
SSL_library_init();
SSL_load_error_strings();
if ((CTX = SSL_CTX_new(SSLv23_server_method())) == NULL) {
cry(fc(ctx), "SSL_CTX_new error: %s", ssl_error());
} else if (ctx->user_callback != NULL) {
memset(&request_info, 0, sizeof(request_info));
request_info.user_data = ctx->user_data;
ctx->user_callback(MG_INIT_SSL, (struct mg_connection *) CTX,
&request_info);
}
if (CTX != NULL && SSL_CTX_use_certificate_file(CTX, pem,
SSL_FILETYPE_PEM) == 0) {
cry(fc(ctx), "%s: cannot open %s: %s", __func__, pem, ssl_error());
return 0;
} else if (CTX != NULL && SSL_CTX_use_PrivateKey_file(CTX, pem,
SSL_FILETYPE_PEM) == 0) {
cry(fc(ctx), "%s: cannot open %s: %s", NULL, pem, ssl_error());
return 0;
}
if (CTX != NULL && chain != NULL &&
SSL_CTX_use_certificate_chain_file(CTX, chain) == 0) {
cry(fc(ctx), "%s: cannot open %s: %s", NULL, chain, ssl_error());
return 0;
}
// Initialize locking callbacks, needed for thread safety.
// http://www.openssl.org/support/faq.html#PROG1
size = sizeof(pthread_mutex_t) * CRYPTO_num_locks();
if ((ssl_mutexes = (pthread_mutex_t *) malloc((size_t)size)) == NULL) {
cry(fc(ctx), "%s: cannot allocate mutexes: %s", __func__, ssl_error());
return 0;
}
for (i = 0; i < CRYPTO_num_locks(); i++) {
pthread_mutex_init(&ssl_mutexes[i], NULL);
}
CRYPTO_set_locking_callback(&ssl_locking_callback);
CRYPTO_set_id_callback(&ssl_id_callback);
// Done with everything. Save the context.
ctx->ssl_ctx = CTX;
return 1;
}
#endif // !NO_SSL
static int set_gpass_option(struct mg_context *ctx) {
struct mgstat mgstat;
const char *path = ctx->config[GLOBAL_PASSWORDS_FILE];
return path == NULL || mg_stat(path, &mgstat) == 0;
}
static int set_acl_option(struct mg_context *ctx) {
struct usa fake;
return check_acl(ctx, &fake) != -1;
}
static void reset_per_request_attributes(struct mg_connection *conn) {
struct mg_request_info *ri = &conn->request_info;
// Reset request info attributes. DO NOT TOUCH is_ssl, remote_ip, remote_port
if (ri->remote_user != NULL) {
free((void *) ri->remote_user);
}
ri->remote_user = ri->request_method = ri->uri = ri->http_version = NULL;
ri->num_headers = 0;
ri->status_code = -1;
conn->num_bytes_sent = conn->consumed_content = 0;
conn->content_len = -1;
conn->request_len = conn->data_len = 0;
}
static void close_socket_gracefully(SOCKET sock) {
char buf[BUFSIZ];
int n;
// Send FIN to the client
(void) shutdown(sock, SHUT_WR);
set_non_blocking_mode(sock);
// Read and discard pending data. If we do not do that and close the
// socket, the data in the send buffer may be discarded. This
// behaviour is seen on Windows, when client keeps sending data
// when server decide to close the connection; then when client
// does recv() it gets no data back.
do {
n = pull(NULL, sock, NULL, buf, sizeof(buf));
} while (n > 0);
// Now we know that our FIN is ACK-ed, safe to close
(void) closesocket(sock);
}
static void close_connection(struct mg_connection *conn) {
if (conn->ssl) {
SSL_free(conn->ssl);
conn->ssl = NULL;
}
if (conn->client.sock != INVALID_SOCKET) {
close_socket_gracefully(conn->client.sock);
}
}
static void discard_current_request_from_buffer(struct mg_connection *conn) {
char *buffered;
int buffered_len, body_len;
buffered = conn->buf + conn->request_len;
buffered_len = conn->data_len - conn->request_len;
assert(buffered_len >= 0);
if (conn->content_len == -1) {
body_len = 0;
} else if (conn->content_len < (int64_t) buffered_len) {
body_len = (int) conn->content_len;
} else {
body_len = buffered_len;
}
conn->data_len -= conn->request_len + body_len;
memmove(conn->buf, conn->buf + conn->request_len + body_len,
(size_t) conn->data_len);
}
static int parse_url(const char *url, char *host, int *port) {
int len;
if (sscanf(url, "%*[htps]://%1024[^:]:%d%n", host, port, &len) == 2 ||
sscanf(url, "%1024[^:]:%d%n", host, port, &len) == 2) {
} else if (sscanf(url, "%*[htps]://%1024[^/]%n", host, &len) == 1) {
*port = 80;
} else {
sscanf(url, "%1024[^/]%n", host, &len);
*port = 80;
}
DEBUG_TRACE(("Host:%s, port:%d", host, *port));
return len;
}
static void handle_proxy_request(struct mg_connection *conn) {
struct mg_request_info *ri = &conn->request_info;
char host[1025], buf[BUFSIZ];
int port, is_ssl, len, i, n;
DEBUG_TRACE(("URL: %s", ri->uri));
if (conn->request_info.uri[0] == '/' ||
(ri->uri == NULL || (len = parse_url(ri->uri, host, &port))) == 0) {
return;
}
if (conn->peer == NULL) {
is_ssl = !strcmp(ri->request_method, "CONNECT");
if ((conn->peer = mg_connect(conn, host, port, is_ssl)) == NULL) {
return;
}
conn->peer->client.is_ssl = is_ssl;
}
// Forward client's request to the target
mg_printf(conn->peer, "%s %s HTTP/%s\r\n", ri->request_method, ri->uri + len,
ri->http_version);
// And also all headers. TODO(lsm): anonymize!
for (i = 0; i < ri->num_headers; i++) {
mg_printf(conn->peer, "%s: %s\r\n", ri->http_headers[i].name,
ri->http_headers[i].value);
}
// End of headers, final newline
mg_write(conn->peer, "\r\n", 2);
// Read and forward body data if any
if (!strcmp(ri->request_method, "POST")) {
forward_body_data(conn, NULL, conn->peer->client.sock, conn->peer->ssl);
}
// Read data from the target and forward it to the client
while ((n = pull(NULL, conn->peer->client.sock, conn->peer->ssl,
buf, sizeof(buf))) > 0) {
if (mg_write(conn, buf, (size_t)n) != n) {
break;
}
}
if (!conn->peer->client.is_ssl) {
close_connection(conn->peer);
free(conn->peer);
conn->peer = NULL;
}
}
static int is_valid_uri(const char *uri) {
// Conform to http://www.w3.org/Protocols/rfc2616/rfc2616-sec5.html#sec5.1.2
// URI can be an asterisk (*) or should start with slash.
return (uri[0] == '/' || (uri[0] == '*' && uri[1] == '\0'));
}
static void process_new_connection(struct mg_connection *conn) {
struct mg_request_info *ri = &conn->request_info;
int keep_alive_enabled;
const char *cl;
keep_alive_enabled = !strcmp(conn->ctx->config[ENABLE_KEEP_ALIVE], "yes");
do {
reset_per_request_attributes(conn);
// If next request is not pipelined, read it in
if ((conn->request_len = get_request_len(conn->buf, conn->data_len)) == 0) {
conn->request_len = read_request(NULL, conn->client.sock, conn->ssl,
conn->buf, conn->buf_size, &conn->data_len);
}
assert(conn->data_len >= conn->request_len);
if (conn->request_len == 0 && conn->data_len == conn->buf_size) {
send_http_error(conn, 413, "Request Too Large", "");
return;
} if (conn->request_len <= 0) {
return; // Remote end closed the connection
}
// Nul-terminate the request cause parse_http_request() uses sscanf
conn->buf[conn->request_len - 1] = '\0';
if (!parse_http_request(conn->buf, ri) ||
(!conn->client.is_proxy && !is_valid_uri(ri->uri))) {
// Do not put garbage in the access log, just send it back to the client
send_http_error(conn, 400, "Bad Request",
"Cannot parse HTTP request: [%.*s]", conn->data_len, conn->buf);
} else if (strcmp(ri->http_version, "1.0") &&
strcmp(ri->http_version, "1.1")) {
// Request seems valid, but HTTP version is strange
send_http_error(conn, 505, "HTTP version not supported", "");
log_access(conn);
} else {
// Request is valid, handle it
cl = get_header(ri, "Content-Length");
conn->content_len = cl == NULL ? -1 : strtoll(cl, NULL, 10);
conn->birth_time = time(NULL);
if (conn->client.is_proxy) {
handle_proxy_request(conn);
} else {
handle_request(conn);
}
log_access(conn);
discard_current_request_from_buffer(conn);
}
// conn->peer is not NULL only for SSL-ed proxy connections
} while (conn->peer || (keep_alive_enabled && should_keep_alive(conn)));
}
// Worker threads take accepted socket from the queue
static int consume_socket(struct mg_context *ctx, struct socket *sp) {
(void) pthread_mutex_lock(&ctx->mutex);
DEBUG_TRACE(("going idle"));
// If the queue is empty, wait. We're idle at this point.
while (ctx->sq_head == ctx->sq_tail && ctx->stop_flag == 0) {
pthread_cond_wait(&ctx->sq_full, &ctx->mutex);
}
// Master thread could wake us up without putting a socket.
// If this happens, it is time to exit.
if (ctx->stop_flag) {
(void) pthread_mutex_unlock(&ctx->mutex);
return 0;
}
assert(ctx->sq_head > ctx->sq_tail);
// Copy socket from the queue and increment tail
*sp = ctx->queue[ctx->sq_tail % ARRAY_SIZE(ctx->queue)];
ctx->sq_tail++;
DEBUG_TRACE(("grabbed socket %d, going busy", sp->sock));
// Wrap pointers if needed
while (ctx->sq_tail > (int) ARRAY_SIZE(ctx->queue)) {
ctx->sq_tail -= ARRAY_SIZE(ctx->queue);
ctx->sq_head -= ARRAY_SIZE(ctx->queue);
}
(void) pthread_cond_signal(&ctx->sq_empty);
(void) pthread_mutex_unlock(&ctx->mutex);
return 1;
}
static void worker_thread(struct mg_context *ctx) {
struct mg_connection *conn;
int buf_size = atoi(ctx->config[MAX_REQUEST_SIZE]);
conn = (struct mg_connection *) calloc(1, sizeof(*conn) + buf_size);
conn->buf_size = buf_size;
conn->buf = (char *) (conn + 1);
assert(conn != NULL);
while (ctx->stop_flag == 0 && consume_socket(ctx, &conn->client)) {
conn->birth_time = time(NULL);
conn->ctx = ctx;
// Fill in IP, port info early so even if SSL setup below fails,
// error handler would have the corresponding info.
// Thanks to Johannes Winkelmann for the patch.
conn->request_info.remote_port = ntohs(conn->client.rsa.u.sin.sin_port);
memcpy(&conn->request_info.remote_ip,
&conn->client.rsa.u.sin.sin_addr.s_addr, 4);
conn->request_info.remote_ip = ntohl(conn->request_info.remote_ip);
conn->request_info.is_ssl = conn->client.is_ssl;
if (!conn->client.is_ssl ||
(conn->client.is_ssl && sslize(conn, SSL_accept))) {
process_new_connection(conn);
}
close_connection(conn);
}
free(conn);
// Signal master that we're done with connection and exiting
(void) pthread_mutex_lock(&ctx->mutex);
ctx->num_threads--;
(void) pthread_cond_signal(&ctx->cond);
assert(ctx->num_threads >= 0);
(void) pthread_mutex_unlock(&ctx->mutex);
DEBUG_TRACE(("exiting"));
}
// Master thread adds accepted socket to a queue
static void produce_socket(struct mg_context *ctx, const struct socket *sp) {
(void) pthread_mutex_lock(&ctx->mutex);
// If the queue is full, wait
while (ctx->sq_head - ctx->sq_tail >= (int) ARRAY_SIZE(ctx->queue)) {
(void) pthread_cond_wait(&ctx->sq_empty, &ctx->mutex);
}
assert(ctx->sq_head - ctx->sq_tail < (int) ARRAY_SIZE(ctx->queue));
// Copy socket to the queue and increment head
ctx->queue[ctx->sq_head % ARRAY_SIZE(ctx->queue)] = *sp;
ctx->sq_head++;
DEBUG_TRACE(("queued socket %d", sp->sock));
(void) pthread_cond_signal(&ctx->sq_full);
(void) pthread_mutex_unlock(&ctx->mutex);
}
static void accept_new_connection(const struct socket *listener,
struct mg_context *ctx) {
struct socket accepted;
int allowed;
accepted.rsa.len = sizeof(accepted.rsa.u.sin);
accepted.lsa = listener->lsa;
accepted.sock = accept(listener->sock, &accepted.rsa.u.sa, &accepted.rsa.len);
if (accepted.sock != INVALID_SOCKET) {
allowed = check_acl(ctx, &accepted.rsa);
if (allowed) {
// Put accepted socket structure into the queue
DEBUG_TRACE(("accepted socket %d", accepted.sock));
accepted.is_ssl = listener->is_ssl;
accepted.is_proxy = listener->is_proxy;
produce_socket(ctx, &accepted);
} else {
cry(fc(ctx), "%s: %s is not allowed to connect",
__func__, inet_ntoa(accepted.rsa.u.sin.sin_addr));
(void) closesocket(accepted.sock);
}
}
}
static void master_thread(struct mg_context *ctx) {
fd_set read_set;
struct timeval tv;
struct socket *sp;
int max_fd;
while (ctx->stop_flag == 0) {
FD_ZERO(&read_set);
max_fd = -1;
// Add listening sockets to the read set
for (sp = ctx->listening_sockets; sp != NULL; sp = sp->next) {
add_to_set(sp->sock, &read_set, &max_fd);
}
tv.tv_sec = 0;
tv.tv_usec = 200 * 1000;
if (select(max_fd + 1, &read_set, NULL, NULL, &tv) < 0) {
#ifdef _WIN32
// On windows, if read_set and write_set are empty,
// select() returns "Invalid parameter" error
// (at least on my Windows XP Pro). So in this case, we sleep here.
sleep(1);
#endif // _WIN32
} else {
for (sp = ctx->listening_sockets; sp != NULL; sp = sp->next) {
if (FD_ISSET(sp->sock, &read_set)) {
accept_new_connection(sp, ctx);
}
}
}
}
DEBUG_TRACE(("stopping workers"));
// Stop signal received: somebody called mg_stop. Quit.
close_all_listening_sockets(ctx);
// Wakeup workers that are waiting for connections to handle.
pthread_cond_broadcast(&ctx->sq_full);
// Wait until all threads finish
(void) pthread_mutex_lock(&ctx->mutex);
while (ctx->num_threads > 0) {
(void) pthread_cond_wait(&ctx->cond, &ctx->mutex);
}
(void) pthread_mutex_unlock(&ctx->mutex);
// All threads exited, no sync is needed. Destroy mutex and condvars
(void) pthread_mutex_destroy(&ctx->mutex);
(void) pthread_cond_destroy(&ctx->cond);
(void) pthread_cond_destroy(&ctx->sq_empty);
(void) pthread_cond_destroy(&ctx->sq_full);
// Signal mg_stop() that we're done
ctx->stop_flag = 2;
DEBUG_TRACE(("exiting"));
}
static void free_context(struct mg_context *ctx) {
int i;
// Deallocate config parameters
for (i = 0; i < NUM_OPTIONS; i++) {
if (ctx->config[i] != NULL)
free(ctx->config[i]);
}
// Deallocate SSL context
if (ctx->ssl_ctx != NULL) {
SSL_CTX_free(ctx->ssl_ctx);
}
#ifndef NO_SSL
if (ssl_mutexes != NULL) {
free(ssl_mutexes);
}
#endif // !NO_SSL
// Deallocate context itself
free(ctx);
}
void mg_stop(struct mg_context *ctx) {
ctx->stop_flag = 1;
// Wait until mg_fini() stops
while (ctx->stop_flag != 2) {
(void) sleep(0);
}
free_context(ctx);
#if defined(_WIN32) && !defined(__SYMBIAN32__)
(void) WSACleanup();
#endif // _WIN32
}
struct mg_context *mg_start(mg_callback_t user_callback, void *user_data,
const char **options) {
struct mg_context *ctx;
const char *name, *value, *default_value;
int i;
#if defined(_WIN32) && !defined(__SYMBIAN32__)
WSADATA data;
WSAStartup(MAKEWORD(2,2), &data);
#endif // _WIN32
// Allocate context and initialize reasonable general case defaults.
// TODO(lsm): do proper error handling here.
ctx = (struct mg_context *) calloc(1, sizeof(*ctx));
ctx->user_callback = user_callback;
ctx->user_data = user_data;
while (options && (name = *options++) != NULL) {
if ((i = get_option_index(name)) == -1) {
cry(fc(ctx), "Invalid option: %s", name);
free_context(ctx);
return NULL;
} else if ((value = *options++) == NULL) {
cry(fc(ctx), "%s: option value cannot be NULL", name);
free_context(ctx);
return NULL;
}
ctx->config[i] = mg_strdup(value);
DEBUG_TRACE(("[%s] -> [%s]", name, value));
}
// Set default value if needed
for (i = 0; config_options[i * ENTRIES_PER_CONFIG_OPTION] != NULL; i++) {
default_value = config_options[i * ENTRIES_PER_CONFIG_OPTION + 2];
if (ctx->config[i] == NULL && default_value != NULL) {
ctx->config[i] = mg_strdup(default_value);
DEBUG_TRACE(("Setting default: [%s] -> [%s]",
config_options[i * ENTRIES_PER_CONFIG_OPTION + 1],
default_value));
}
}
// NOTE(lsm): order is important here. SSL certificates must
// be initialized before listening ports. UID must be set last.
if (!set_gpass_option(ctx) ||
#if !defined(NO_SSL)
!set_ssl_option(ctx) ||
#endif
!set_ports_option(ctx) ||
#if !defined(_WIN32)
!set_uid_option(ctx) ||
#endif
!set_acl_option(ctx)) {
free_context(ctx);
return NULL;
}
#if !defined(_WIN32) && !defined(__SYMBIAN32__)
// Ignore SIGPIPE signal, so if browser cancels the request, it
// won't kill the whole process.
(void) signal(SIGPIPE, SIG_IGN);
// Also ignoring SIGCHLD to let the OS to reap zombies properly.
(void) signal(SIGCHLD, SIG_IGN);
#endif // !_WIN32
(void) pthread_mutex_init(&ctx->mutex, NULL);
(void) pthread_cond_init(&ctx->cond, NULL);
(void) pthread_cond_init(&ctx->sq_empty, NULL);
(void) pthread_cond_init(&ctx->sq_full, NULL);
// Start master (listening) thread
start_thread(ctx, (mg_thread_func_t) master_thread, ctx);
// Start worker threads
for (i = 0; i < atoi(ctx->config[NUM_THREADS]); i++) {
if (start_thread(ctx, (mg_thread_func_t) worker_thread, ctx) != 0) {
cry(fc(ctx), "Cannot start worker thread: %d", ERRNO);
} else {
ctx->num_threads++;
}
}
return ctx;
}
Reference in New Issue View Git Blame Copy Permalink