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Add mg_check_ip_acl()

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This commit is contained in:
Sergey Lyubka 2021-08-25 07:59:31 +01:00
parent 1c456fc2df
commit fc9c454518
6 changed files with 110 additions and 15 deletions
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26
docs/README.md
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@ -10,8 +10,6 @@ by a vast number of open source and commercial products - it even runs on the
International Space Station! Mongoose makes embedded network programming fast,
robust, and easy.
## Concept
Mongoose has three basic data structures:
- `struct mg_mgr` - an event manager that holds all active connections
@ -1213,7 +1211,7 @@ The glob pattern matching rules are as follows:
- any other character matches itself
### mg\_next\_comma\_entry()
### mg\_comma()
```c
bool mg_comma(struct mg_str *s, struct mg_str *k, struct mg_str *v);
@ -1374,3 +1372,25 @@ uint32_t mg_crc32(uint32_t crc, const uint8_t *buf, size_t len);
Calculate CRC32 checksum for a given buffer. An initial `crc` value should
be `0`.
### mg\_check\_ip\_acl()
```c
int mg_check_ip_acl(struct mg_str acl, uint32_t remote_ip);
```
Check IPv4 address `remote_ip` against the IP ACL `acl`. Parameters:
- `acl` - an ACL string, e.g. `-0.0.0.0/0,+1.2.3.4`
- `remote_ip` - IPv4 address in network byte order
Return value: 1 if `remote_ip` is allowed, 0 if not, and <0 if `acl` is
invalid.
Usage example:
```
if (mg_check_ip_acl(mg_str("-0.0.0.0/0,+1.2.3.4"), c->peer.ip) != 1) {
LOG(LL_INFO, ("NOT ALLOWED!"));
}
```

39
mongoose.c
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@ -4249,7 +4249,7 @@ uint32_t mg_ntohl(uint32_t net) {
uint16_t mg_ntohs(uint16_t net) {
uint8_t data[2] = {0, 0};
memcpy(&data, &net, sizeof(data));
return (uint16_t)((uint16_t) data[1] | (((uint16_t) data[0]) << 8));
return (uint16_t) ((uint16_t) data[1] | (((uint16_t) data[0]) << 8));
}
char *mg_hexdump(const void *buf, size_t len) {
@ -4292,10 +4292,9 @@ char *mg_hex(const void *buf, size_t len, char *to) {
}
static unsigned char mg_unhex_nimble(unsigned char c) {
return (c >= '0' && c <= '9')
? (unsigned char) (c - '0')
: (c >= 'A' && c <= 'F') ? (unsigned char) (c - '7')
: (unsigned char) (c - 'W');
return (c >= '0' && c <= '9') ? (unsigned char) (c - '0')
: (c >= 'A' && c <= 'F') ? (unsigned char) (c - '7')
: (unsigned char) (c - 'W');
}
unsigned long mg_unhexn(const char *s, size_t len) {
@ -4388,6 +4387,36 @@ uint32_t mg_crc32(uint32_t crc, const char *buf, size_t len) {
return ~crc;
}
static int isbyte(int n) {
return n >= 0 && n <= 255;
}
static int parse_net(const char *spec, uint32_t *net, uint32_t *mask) {
int n, a, b, c, d, slash = 32, len = 0;
if ((sscanf(spec, "%d.%d.%d.%d/%d%n", &a, &b, &c, &d, &slash, &n) == 5 ||
sscanf(spec, "%d.%d.%d.%d%n", &a, &b, &c, &d, &n) == 4) &&
isbyte(a) && isbyte(b) && isbyte(c) && isbyte(d) && slash >= 0 &&
slash < 33) {
len = n;
*net = ((uint32_t) a << 24) | ((uint32_t) b << 16) | ((uint32_t) c << 8) |
(uint32_t) d;
*mask = slash ? (uint32_t) (0xffffffffU << (32 - slash)) : (uint32_t) 0;
}
return len;
}
int mg_check_ip_acl(struct mg_str acl, uint32_t remote_ip) {
struct mg_str k, v;
int allowed = acl.len == 0 ? '+' : '-'; // If any ACL is set, deny by default
while (mg_comma(&acl, &k, &v)) {
uint32_t net, mask;
if (k.ptr[0] != '+' && k.ptr[0] != '-') return -1;
if (parse_net(&k.ptr[1], &net, &mask) == 0) return -2;
if ((remote_ip & mask) == net) allowed = k.ptr[0];
}
return allowed == '+';
}
double mg_time(void) {
#if MG_ARCH == MG_ARCH_WIN32
SYSTEMTIME sysnow;

6
mongoose.h
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@ -512,14 +512,15 @@ void mg_log_set_callback(void (*fn)(const void *, size_t, void *), void *param);
struct mg_timer {
unsigned long period_ms; // Timer period in milliseconds
unsigned flags; // Possible flags values below
#define MG_TIMER_REPEAT 1 // Call function periodically, otherwise run once
#define MG_TIMER_RUN_NOW 2 // Call immediately when timer is set
void (*fn)(void *); // Function to call
void *arg; // Function argument
unsigned long expire; // Expiration timestamp in milliseconds
struct mg_timer *next; // Linkage in g_timers list
};
#define MG_TIMER_REPEAT 1 // Call function periodically, otherwise run once
#define MG_TIMER_RUN_NOW 2 // Call immediately when timer is set
extern struct mg_timer *g_timers; // Global list of timers
void mg_timer_init(struct mg_timer *, unsigned long ms, unsigned,
@ -547,6 +548,7 @@ unsigned long mg_unhexn(const char *s, size_t len);
int mg_asprintf(char **buf, size_t size, const char *fmt, ...);
int mg_vasprintf(char **buf, size_t size, const char *fmt, va_list ap);
int64_t mg_to64(struct mg_str str);
int mg_check_ip_acl(struct mg_str acl, uint32_t remote_ip);
double mg_time(void);
unsigned long mg_millis(void);
void mg_usleep(unsigned long usecs);

39
src/util.c
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@ -127,7 +127,7 @@ uint32_t mg_ntohl(uint32_t net) {
uint16_t mg_ntohs(uint16_t net) {
uint8_t data[2] = {0, 0};
memcpy(&data, &net, sizeof(data));
return (uint16_t)((uint16_t) data[1] | (((uint16_t) data[0]) << 8));
return (uint16_t) ((uint16_t) data[1] | (((uint16_t) data[0]) << 8));
}
char *mg_hexdump(const void *buf, size_t len) {
@ -170,10 +170,9 @@ char *mg_hex(const void *buf, size_t len, char *to) {
}
static unsigned char mg_unhex_nimble(unsigned char c) {
return (c >= '0' && c <= '9')
? (unsigned char) (c - '0')
: (c >= 'A' && c <= 'F') ? (unsigned char) (c - '7')
: (unsigned char) (c - 'W');
return (c >= '0' && c <= '9') ? (unsigned char) (c - '0')
: (c >= 'A' && c <= 'F') ? (unsigned char) (c - '7')
: (unsigned char) (c - 'W');
}
unsigned long mg_unhexn(const char *s, size_t len) {
@ -266,6 +265,36 @@ uint32_t mg_crc32(uint32_t crc, const char *buf, size_t len) {
return ~crc;
}
static int isbyte(int n) {
return n >= 0 && n <= 255;
}
static int parse_net(const char *spec, uint32_t *net, uint32_t *mask) {
int n, a, b, c, d, slash = 32, len = 0;
if ((sscanf(spec, "%d.%d.%d.%d/%d%n", &a, &b, &c, &d, &slash, &n) == 5 ||
sscanf(spec, "%d.%d.%d.%d%n", &a, &b, &c, &d, &n) == 4) &&
isbyte(a) && isbyte(b) && isbyte(c) && isbyte(d) && slash >= 0 &&
slash < 33) {
len = n;
*net = ((uint32_t) a << 24) | ((uint32_t) b << 16) | ((uint32_t) c << 8) |
(uint32_t) d;
*mask = slash ? (uint32_t) (0xffffffffU << (32 - slash)) : (uint32_t) 0;
}
return len;
}
int mg_check_ip_acl(struct mg_str acl, uint32_t remote_ip) {
struct mg_str k, v;
int allowed = acl.len == 0 ? '+' : '-'; // If any ACL is set, deny by default
while (mg_comma(&acl, &k, &v)) {
uint32_t net, mask;
if (k.ptr[0] != '+' && k.ptr[0] != '-') return -1;
if (parse_net(&k.ptr[1], &net, &mask) == 0) return -2;
if ((remote_ip & mask) == net) allowed = k.ptr[0];
}
return allowed == '+';
}
double mg_time(void) {
#if MG_ARCH == MG_ARCH_WIN32
SYSTEMTIME sysnow;

1
src/util.h
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@ -19,6 +19,7 @@ unsigned long mg_unhexn(const char *s, size_t len);
int mg_asprintf(char **buf, size_t size, const char *fmt, ...);
int mg_vasprintf(char **buf, size_t size, const char *fmt, va_list ap);
int64_t mg_to64(struct mg_str str);
int mg_check_ip_acl(struct mg_str acl, uint32_t remote_ip);
double mg_time(void);
unsigned long mg_millis(void);
void mg_usleep(unsigned long usecs);

14
test/unit_test.c
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@ -1461,8 +1461,22 @@ static void test_udp(void) {
ASSERT(mgr.conns == NULL);
}
static void test_check_ip_acl(void) {
uint32_t ip = 0x01020304;
ASSERT(mg_check_ip_acl(mg_str(NULL), ip) == 1);
ASSERT(mg_check_ip_acl(mg_str(""), ip) == 1);
ASSERT(mg_check_ip_acl(mg_str("invalid"), ip) == -1);
ASSERT(mg_check_ip_acl(mg_str("+hi"), ip) == -2);
ASSERT(mg_check_ip_acl(mg_str("+//"), ip) == -2);
ASSERT(mg_check_ip_acl(mg_str("-0.0.0.0/0"), ip) == 0);
ASSERT(mg_check_ip_acl(mg_str("-0.0.0.0/0,+1.0.0.0/8"), ip) == 1);
ASSERT(mg_check_ip_acl(mg_str("-0.0.0.0/0,+1.2.3.4"), ip) == 1);
ASSERT(mg_check_ip_acl(mg_str("-0.0.0.0/0,+1.0.0.0/16"), ip) == 0);
}
int main(void) {
mg_log_set("3");
test_check_ip_acl();
test_udp();
test_pipe();
test_packed();