261 lines
7.1 KiB
C
261 lines
7.1 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* SPDX-License-Identifier: curl
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*
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***************************************************************************/
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#include "curl_setup.h"
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#ifdef HAVE_NETINET_IN_H
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# include <netinet/in.h>
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#endif
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#ifdef HAVE_ARPA_INET_H
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# include <arpa/inet.h>
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#endif
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#ifdef HAVE_NET_IF_H
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# include <net/if.h>
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#endif
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#ifdef HAVE_SYS_IOCTL_H
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# include <sys/ioctl.h>
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#endif
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#ifdef HAVE_NETDB_H
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# include <netdb.h>
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#endif
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#ifdef HAVE_SYS_SOCKIO_H
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# include <sys/sockio.h>
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#endif
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#ifdef HAVE_IFADDRS_H
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# include <ifaddrs.h>
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#endif
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#ifdef HAVE_STROPTS_H
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# include <stropts.h>
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#endif
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#ifdef __VMS
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# include <inet.h>
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#endif
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#include "inet_ntop.h"
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#include "strcase.h"
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#include "if2ip.h"
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/* The last 3 #include files should be in this order */
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#include "curl_printf.h"
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#include "curl_memory.h"
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#include "memdebug.h"
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/* ------------------------------------------------------------------ */
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#ifdef USE_IPV6
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/* Return the scope of the given address. */
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unsigned int Curl_ipv6_scope(const struct sockaddr *sa)
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{
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if(sa->sa_family == AF_INET6) {
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const struct sockaddr_in6 * sa6 = (const struct sockaddr_in6 *)(void *) sa;
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const unsigned char *b = sa6->sin6_addr.s6_addr;
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unsigned short w = (unsigned short) ((b[0] << 8) | b[1]);
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if((b[0] & 0xFE) == 0xFC) /* Handle ULAs */
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return IPV6_SCOPE_UNIQUELOCAL;
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switch(w & 0xFFC0) {
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case 0xFE80:
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return IPV6_SCOPE_LINKLOCAL;
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case 0xFEC0:
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return IPV6_SCOPE_SITELOCAL;
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case 0x0000:
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w = b[1] | b[2] | b[3] | b[4] | b[5] | b[6] | b[7] | b[8] | b[9] |
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b[10] | b[11] | b[12] | b[13] | b[14];
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if(w || b[15] != 0x01)
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break;
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return IPV6_SCOPE_NODELOCAL;
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default:
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break;
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}
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}
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return IPV6_SCOPE_GLOBAL;
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}
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#endif
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#ifndef CURL_DISABLE_BINDLOCAL
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#if defined(HAVE_GETIFADDRS)
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if2ip_result_t Curl_if2ip(int af,
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#ifdef USE_IPV6
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unsigned int remote_scope,
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unsigned int local_scope_id,
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#endif
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const char *interf,
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char *buf, size_t buf_size)
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{
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struct ifaddrs *iface, *head;
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if2ip_result_t res = IF2IP_NOT_FOUND;
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#if defined(USE_IPV6) && \
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!defined(HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID)
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(void) local_scope_id;
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#endif
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if(getifaddrs(&head) >= 0) {
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for(iface = head; iface != NULL; iface = iface->ifa_next) {
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if(iface->ifa_addr) {
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if(iface->ifa_addr->sa_family == af) {
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if(strcasecompare(iface->ifa_name, interf)) {
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void *addr;
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const char *ip;
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char scope[12] = "";
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char ipstr[64];
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#ifdef USE_IPV6
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if(af == AF_INET6) {
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#ifdef HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID
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unsigned int scopeid = 0;
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#endif
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unsigned int ifscope = Curl_ipv6_scope(iface->ifa_addr);
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if(ifscope != remote_scope) {
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/* We are interested only in interface addresses whose scope
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matches the remote address we want to connect to: global
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for global, link-local for link-local, etc... */
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if(res == IF2IP_NOT_FOUND)
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res = IF2IP_AF_NOT_SUPPORTED;
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continue;
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}
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addr =
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&((struct sockaddr_in6 *)(void *)iface->ifa_addr)->sin6_addr;
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#ifdef HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID
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/* Include the scope of this interface as part of the address */
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scopeid = ((struct sockaddr_in6 *)(void *)iface->ifa_addr)
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->sin6_scope_id;
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/* If given, scope id should match. */
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if(local_scope_id && scopeid != local_scope_id) {
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if(res == IF2IP_NOT_FOUND)
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res = IF2IP_AF_NOT_SUPPORTED;
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continue;
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}
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if(scopeid)
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msnprintf(scope, sizeof(scope), "%%%u", scopeid);
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#endif
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}
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else
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#endif
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addr =
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&((struct sockaddr_in *)(void *)iface->ifa_addr)->sin_addr;
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res = IF2IP_FOUND;
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ip = Curl_inet_ntop(af, addr, ipstr, sizeof(ipstr));
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msnprintf(buf, buf_size, "%s%s", ip, scope);
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break;
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}
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}
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else if((res == IF2IP_NOT_FOUND) &&
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strcasecompare(iface->ifa_name, interf)) {
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res = IF2IP_AF_NOT_SUPPORTED;
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}
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}
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}
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freeifaddrs(head);
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}
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return res;
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}
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#elif defined(HAVE_IOCTL_SIOCGIFADDR)
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if2ip_result_t Curl_if2ip(int af,
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#ifdef USE_IPV6
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unsigned int remote_scope,
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unsigned int local_scope_id,
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#endif
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const char *interf,
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char *buf, size_t buf_size)
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{
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struct ifreq req;
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struct in_addr in;
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struct sockaddr_in *s;
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curl_socket_t dummy;
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size_t len;
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const char *r;
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#ifdef USE_IPV6
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(void)remote_scope;
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(void)local_scope_id;
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#endif
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if(!interf || (af != AF_INET))
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return IF2IP_NOT_FOUND;
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len = strlen(interf);
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if(len >= sizeof(req.ifr_name))
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return IF2IP_NOT_FOUND;
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dummy = socket(AF_INET, SOCK_STREAM, 0);
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if(CURL_SOCKET_BAD == dummy)
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return IF2IP_NOT_FOUND;
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memset(&req, 0, sizeof(req));
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memcpy(req.ifr_name, interf, len + 1);
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req.ifr_addr.sa_family = AF_INET;
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if(ioctl(dummy, SIOCGIFADDR, &req) < 0) {
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sclose(dummy);
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/* With SIOCGIFADDR, we cannot tell the difference between an interface
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that does not exist and an interface that has no address of the
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correct family. Assume the interface does not exist */
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return IF2IP_NOT_FOUND;
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}
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s = (struct sockaddr_in *)(void *)&req.ifr_addr;
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memcpy(&in, &s->sin_addr, sizeof(in));
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r = Curl_inet_ntop(s->sin_family, &in, buf, buf_size);
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sclose(dummy);
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if(!r)
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return IF2IP_NOT_FOUND;
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return IF2IP_FOUND;
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}
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#else
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if2ip_result_t Curl_if2ip(int af,
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#ifdef USE_IPV6
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unsigned int remote_scope,
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unsigned int local_scope_id,
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#endif
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const char *interf,
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char *buf, size_t buf_size)
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{
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(void) af;
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#ifdef USE_IPV6
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(void) remote_scope;
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(void) local_scope_id;
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#endif
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(void) interf;
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(void) buf;
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(void) buf_size;
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return IF2IP_NOT_FOUND;
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}
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#endif
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#endif /* CURL_DISABLE_BINDLOCAL */
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