• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1 /***************************************************************************
2  *                                  _   _ ____  _
3  *  Project                     ___| | | |  _ \| |
4  *                             / __| | | | |_) | |
5  *                            | (__| |_| |  _ <| |___
6  *                             \___|\___/|_| \_\_____|
7  *
8  * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
9  *
10  * This software is licensed as described in the file COPYING, which
11  * you should have received as part of this distribution. The terms
12  * are also available at https://curl.haxx.se/docs/copyright.html.
13  *
14  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15  * copies of the Software, and permit persons to whom the Software is
16  * furnished to do so, under the terms of the COPYING file.
17  *
18  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19  * KIND, either express or implied.
20  *
21  ***************************************************************************/
22 
23 #include "curl_setup.h"
24 
25 #ifdef HAVE_NETINET_IN_H
26 #  include <netinet/in.h>
27 #endif
28 #ifdef HAVE_ARPA_INET_H
29 #  include <arpa/inet.h>
30 #endif
31 #ifdef HAVE_NET_IF_H
32 #  include <net/if.h>
33 #endif
34 #ifdef HAVE_SYS_IOCTL_H
35 #  include <sys/ioctl.h>
36 #endif
37 #ifdef HAVE_NETDB_H
38 #  include <netdb.h>
39 #endif
40 #ifdef HAVE_SYS_SOCKIO_H
41 #  include <sys/sockio.h>
42 #endif
43 #ifdef HAVE_IFADDRS_H
44 #  include <ifaddrs.h>
45 #endif
46 #ifdef HAVE_STROPTS_H
47 #  include <stropts.h>
48 #endif
49 #ifdef __VMS
50 #  include <inet.h>
51 #endif
52 
53 #include "inet_ntop.h"
54 #include "strcase.h"
55 #include "if2ip.h"
56 /* The last 3 #include files should be in this order */
57 #include "curl_printf.h"
58 #include "curl_memory.h"
59 #include "memdebug.h"
60 
61 /* ------------------------------------------------------------------ */
62 
63 /* Return the scope of the given address. */
Curl_ipv6_scope(const struct sockaddr * sa)64 unsigned int Curl_ipv6_scope(const struct sockaddr *sa)
65 {
66 #ifndef ENABLE_IPV6
67   (void) sa;
68 #else
69   if(sa->sa_family == AF_INET6) {
70     const struct sockaddr_in6 * sa6 = (const struct sockaddr_in6 *)(void *) sa;
71     const unsigned char *b = sa6->sin6_addr.s6_addr;
72     unsigned short w = (unsigned short) ((b[0] << 8) | b[1]);
73 
74     switch(w & 0xFFC0) {
75     case 0xFE80:
76       return IPV6_SCOPE_LINKLOCAL;
77     case 0xFEC0:
78       return IPV6_SCOPE_SITELOCAL;
79     case 0x0000:
80       w = b[1] | b[2] | b[3] | b[4] | b[5] | b[6] | b[7] | b[8] | b[9] |
81           b[10] | b[11] | b[12] | b[13] | b[14];
82       if(w || b[15] != 0x01)
83         break;
84       return IPV6_SCOPE_NODELOCAL;
85     default:
86       break;
87     }
88   }
89 #endif
90 
91   return IPV6_SCOPE_GLOBAL;
92 }
93 
94 
95 #if defined(HAVE_GETIFADDRS)
96 
Curl_if_is_interface_name(const char * interf)97 bool Curl_if_is_interface_name(const char *interf)
98 {
99   bool result = FALSE;
100 
101   struct ifaddrs *iface, *head;
102 
103   if(getifaddrs(&head) >= 0) {
104     for(iface=head; iface != NULL; iface=iface->ifa_next) {
105       if(strcasecompare(iface->ifa_name, interf)) {
106         result = TRUE;
107         break;
108       }
109     }
110     freeifaddrs(head);
111   }
112   return result;
113 }
114 
Curl_if2ip(int af,unsigned int remote_scope,unsigned int remote_scope_id,const char * interf,char * buf,int buf_size)115 if2ip_result_t Curl_if2ip(int af, unsigned int remote_scope,
116                           unsigned int remote_scope_id, const char *interf,
117                           char *buf, int buf_size)
118 {
119   struct ifaddrs *iface, *head;
120   if2ip_result_t res = IF2IP_NOT_FOUND;
121 
122 #ifndef ENABLE_IPV6
123   (void) remote_scope;
124 
125 #ifndef HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID
126   (void) remote_scope_id;
127 #endif
128 
129 #endif
130 
131   if(getifaddrs(&head) >= 0) {
132     for(iface = head; iface != NULL; iface=iface->ifa_next) {
133       if(iface->ifa_addr != NULL) {
134         if(iface->ifa_addr->sa_family == af) {
135           if(strcasecompare(iface->ifa_name, interf)) {
136             void *addr;
137             char *ip;
138             char scope[12] = "";
139             char ipstr[64];
140 #ifdef ENABLE_IPV6
141             if(af == AF_INET6) {
142               unsigned int scopeid = 0;
143               unsigned int ifscope = Curl_ipv6_scope(iface->ifa_addr);
144 
145               if(ifscope != remote_scope) {
146                 /* We are interested only in interface addresses whose
147                    scope matches the remote address we want to
148                    connect to: global for global, link-local for
149                    link-local, etc... */
150                 if(res == IF2IP_NOT_FOUND) res = IF2IP_AF_NOT_SUPPORTED;
151                 continue;
152               }
153 
154               addr =
155                 &((struct sockaddr_in6 *)(void *)iface->ifa_addr)->sin6_addr;
156 #ifdef HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID
157               /* Include the scope of this interface as part of the address */
158               scopeid = ((struct sockaddr_in6 *)(void *)iface->ifa_addr)
159                             ->sin6_scope_id;
160 
161               /* If given, scope id should match. */
162               if(remote_scope_id && scopeid != remote_scope_id) {
163                 if(res == IF2IP_NOT_FOUND)
164                   res = IF2IP_AF_NOT_SUPPORTED;
165 
166                 continue;
167               }
168 #endif
169               if(scopeid)
170                 snprintf(scope, sizeof(scope), "%%%u", scopeid);
171             }
172             else
173 #endif
174               addr =
175                   &((struct sockaddr_in *)(void *)iface->ifa_addr)->sin_addr;
176             res = IF2IP_FOUND;
177             ip = (char *) Curl_inet_ntop(af, addr, ipstr, sizeof(ipstr));
178             snprintf(buf, buf_size, "%s%s", ip, scope);
179             break;
180           }
181         }
182         else if((res == IF2IP_NOT_FOUND) &&
183                 strcasecompare(iface->ifa_name, interf)) {
184           res = IF2IP_AF_NOT_SUPPORTED;
185         }
186       }
187     }
188 
189     freeifaddrs(head);
190   }
191 
192   return res;
193 }
194 
195 #elif defined(HAVE_IOCTL_SIOCGIFADDR)
196 
Curl_if_is_interface_name(const char * interf)197 bool Curl_if_is_interface_name(const char *interf)
198 {
199   /* This is here just to support the old interfaces */
200   char buf[256];
201 
202   return (Curl_if2ip(AF_INET, 0 /* unused */, 0, interf, buf, sizeof(buf)) ==
203           IF2IP_NOT_FOUND) ? FALSE : TRUE;
204 }
205 
Curl_if2ip(int af,unsigned int remote_scope,unsigned int remote_scope_id,const char * interf,char * buf,int buf_size)206 if2ip_result_t Curl_if2ip(int af, unsigned int remote_scope,
207                           unsigned int remote_scope_id, const char *interf,
208                           char *buf, int buf_size)
209 {
210   struct ifreq req;
211   struct in_addr in;
212   struct sockaddr_in *s;
213   curl_socket_t dummy;
214   size_t len;
215 
216   (void)remote_scope;
217   (void)remote_scope_id;
218 
219   if(!interf || (af != AF_INET))
220     return IF2IP_NOT_FOUND;
221 
222   len = strlen(interf);
223   if(len >= sizeof(req.ifr_name))
224     return IF2IP_NOT_FOUND;
225 
226   dummy = socket(AF_INET, SOCK_STREAM, 0);
227   if(CURL_SOCKET_BAD == dummy)
228     return IF2IP_NOT_FOUND;
229 
230   memset(&req, 0, sizeof(req));
231   memcpy(req.ifr_name, interf, len+1);
232   req.ifr_addr.sa_family = AF_INET;
233 
234   if(ioctl(dummy, SIOCGIFADDR, &req) < 0) {
235     sclose(dummy);
236     /* With SIOCGIFADDR, we cannot tell the difference between an interface
237        that does not exist and an interface that has no address of the
238        correct family. Assume the interface does not exist */
239     return IF2IP_NOT_FOUND;
240   }
241 
242   s = (struct sockaddr_in *)&req.ifr_addr;
243   memcpy(&in, &s->sin_addr, sizeof(in));
244   Curl_inet_ntop(s->sin_family, &in, buf, buf_size);
245 
246   sclose(dummy);
247   return IF2IP_FOUND;
248 }
249 
250 #else
251 
Curl_if_is_interface_name(const char * interf)252 bool Curl_if_is_interface_name(const char *interf)
253 {
254   (void) interf;
255 
256   return FALSE;
257 }
258 
Curl_if2ip(int af,unsigned int remote_scope,unsigned int remote_scope_id,const char * interf,char * buf,int buf_size)259 if2ip_result_t Curl_if2ip(int af, unsigned int remote_scope,
260                           unsigned int remote_scope_id, const char *interf,
261                           char *buf, int buf_size)
262 {
263     (void) af;
264     (void) remote_scope;
265     (void) remote_scope_id;
266     (void) interf;
267     (void) buf;
268     (void) buf_size;
269     return IF2IP_NOT_FOUND;
270 }
271 
272 #endif
273