1 | /*************************************************************************** |
2 | * _ _ ____ _ |
3 | * Project ___| | | | _ \| | |
4 | * / __| | | | |_) | | |
5 | * | (__| |_| | _ <| |___ |
6 | * \___|\___/|_| \_\_____| |
7 | * |
8 | * Copyright (C) 1998 - 2022, Daniel Stenberg, <[email protected]>, 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.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 | * SPDX-License-Identifier: curl |
22 | * |
23 | ***************************************************************************/ |
24 | |
25 | #include "curl_setup.h" |
26 | |
27 | #ifdef HAVE_NETINET_IN_H |
28 | # include <netinet/in.h> |
29 | #endif |
30 | #ifdef HAVE_ARPA_INET_H |
31 | # include <arpa/inet.h> |
32 | #endif |
33 | #ifdef HAVE_NET_IF_H |
34 | # include <net/if.h> |
35 | #endif |
36 | #ifdef HAVE_SYS_IOCTL_H |
37 | # include <sys/ioctl.h> |
38 | #endif |
39 | #ifdef HAVE_NETDB_H |
40 | # include <netdb.h> |
41 | #endif |
42 | #ifdef HAVE_SYS_SOCKIO_H |
43 | # include <sys/sockio.h> |
44 | #endif |
45 | #ifdef HAVE_IFADDRS_H |
46 | # include <ifaddrs.h> |
47 | #endif |
48 | #ifdef HAVE_STROPTS_H |
49 | # include <stropts.h> |
50 | #endif |
51 | #ifdef __VMS |
52 | # include <inet.h> |
53 | #endif |
54 | |
55 | #include "inet_ntop.h" |
56 | #include "strcase.h" |
57 | #include "if2ip.h" |
58 | /* The last 3 #include files should be in this order */ |
59 | #include "curl_printf.h" |
60 | #include "curl_memory.h" |
61 | #include "memdebug.h" |
62 | |
63 | /* ------------------------------------------------------------------ */ |
64 | |
65 | #ifdef ENABLE_IPV6 |
66 | /* Return the scope of the given address. */ |
67 | unsigned int Curl_ipv6_scope(const struct sockaddr *sa) |
68 | { |
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 | if((b[0] & 0xFE) == 0xFC) /* Handle ULAs */ |
75 | return IPV6_SCOPE_UNIQUELOCAL; |
76 | switch(w & 0xFFC0) { |
77 | case 0xFE80: |
78 | return IPV6_SCOPE_LINKLOCAL; |
79 | case 0xFEC0: |
80 | return IPV6_SCOPE_SITELOCAL; |
81 | case 0x0000: |
82 | w = b[1] | b[2] | b[3] | b[4] | b[5] | b[6] | b[7] | b[8] | b[9] | |
83 | b[10] | b[11] | b[12] | b[13] | b[14]; |
84 | if(w || b[15] != 0x01) |
85 | break; |
86 | return IPV6_SCOPE_NODELOCAL; |
87 | default: |
88 | break; |
89 | } |
90 | } |
91 | return IPV6_SCOPE_GLOBAL; |
92 | } |
93 | #endif |
94 | |
95 | #if defined(HAVE_GETIFADDRS) |
96 | |
97 | if2ip_result_t Curl_if2ip(int af, |
98 | #ifdef ENABLE_IPV6 |
99 | unsigned int remote_scope, |
100 | unsigned int local_scope_id, |
101 | #endif |
102 | const char *interf, |
103 | char *buf, int buf_size) |
104 | { |
105 | struct ifaddrs *iface, *head; |
106 | if2ip_result_t res = IF2IP_NOT_FOUND; |
107 | |
108 | #if defined(ENABLE_IPV6) && \ |
109 | !defined(HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID) |
110 | (void) local_scope_id; |
111 | #endif |
112 | |
113 | if(getifaddrs(&head) >= 0) { |
114 | for(iface = head; iface != NULL; iface = iface->ifa_next) { |
115 | if(iface->ifa_addr) { |
116 | if(iface->ifa_addr->sa_family == af) { |
117 | if(strcasecompare(iface->ifa_name, interf)) { |
118 | void *addr; |
119 | const char *ip; |
120 | char scope[12] = "" ; |
121 | char ipstr[64]; |
122 | #ifdef ENABLE_IPV6 |
123 | if(af == AF_INET6) { |
124 | #ifdef HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID |
125 | unsigned int scopeid = 0; |
126 | #endif |
127 | unsigned int ifscope = Curl_ipv6_scope(iface->ifa_addr); |
128 | |
129 | if(ifscope != remote_scope) { |
130 | /* We are interested only in interface addresses whose scope |
131 | matches the remote address we want to connect to: global |
132 | for global, link-local for link-local, etc... */ |
133 | if(res == IF2IP_NOT_FOUND) |
134 | res = IF2IP_AF_NOT_SUPPORTED; |
135 | continue; |
136 | } |
137 | |
138 | addr = |
139 | &((struct sockaddr_in6 *)(void *)iface->ifa_addr)->sin6_addr; |
140 | #ifdef HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID |
141 | /* Include the scope of this interface as part of the address */ |
142 | scopeid = ((struct sockaddr_in6 *)(void *)iface->ifa_addr) |
143 | ->sin6_scope_id; |
144 | |
145 | /* If given, scope id should match. */ |
146 | if(local_scope_id && scopeid != local_scope_id) { |
147 | if(res == IF2IP_NOT_FOUND) |
148 | res = IF2IP_AF_NOT_SUPPORTED; |
149 | |
150 | continue; |
151 | } |
152 | |
153 | if(scopeid) |
154 | msnprintf(scope, sizeof(scope), "%%%u" , scopeid); |
155 | #endif |
156 | } |
157 | else |
158 | #endif |
159 | addr = |
160 | &((struct sockaddr_in *)(void *)iface->ifa_addr)->sin_addr; |
161 | res = IF2IP_FOUND; |
162 | ip = Curl_inet_ntop(af, addr, ipstr, sizeof(ipstr)); |
163 | msnprintf(buf, buf_size, "%s%s" , ip, scope); |
164 | break; |
165 | } |
166 | } |
167 | else if((res == IF2IP_NOT_FOUND) && |
168 | strcasecompare(iface->ifa_name, interf)) { |
169 | res = IF2IP_AF_NOT_SUPPORTED; |
170 | } |
171 | } |
172 | } |
173 | |
174 | freeifaddrs(head); |
175 | } |
176 | |
177 | return res; |
178 | } |
179 | |
180 | #elif defined(HAVE_IOCTL_SIOCGIFADDR) |
181 | |
182 | if2ip_result_t Curl_if2ip(int af, |
183 | #ifdef ENABLE_IPV6 |
184 | unsigned int remote_scope, |
185 | unsigned int local_scope_id, |
186 | #endif |
187 | const char *interf, |
188 | char *buf, int buf_size) |
189 | { |
190 | struct ifreq req; |
191 | struct in_addr in; |
192 | struct sockaddr_in *s; |
193 | curl_socket_t dummy; |
194 | size_t len; |
195 | const char *r; |
196 | |
197 | #ifdef ENABLE_IPV6 |
198 | (void)remote_scope; |
199 | (void)local_scope_id; |
200 | #endif |
201 | |
202 | if(!interf || (af != AF_INET)) |
203 | return IF2IP_NOT_FOUND; |
204 | |
205 | len = strlen(interf); |
206 | if(len >= sizeof(req.ifr_name)) |
207 | return IF2IP_NOT_FOUND; |
208 | |
209 | dummy = socket(AF_INET, SOCK_STREAM, 0); |
210 | if(CURL_SOCKET_BAD == dummy) |
211 | return IF2IP_NOT_FOUND; |
212 | |
213 | memset(&req, 0, sizeof(req)); |
214 | memcpy(req.ifr_name, interf, len + 1); |
215 | req.ifr_addr.sa_family = AF_INET; |
216 | |
217 | if(ioctl(dummy, SIOCGIFADDR, &req) < 0) { |
218 | sclose(dummy); |
219 | /* With SIOCGIFADDR, we cannot tell the difference between an interface |
220 | that does not exist and an interface that has no address of the |
221 | correct family. Assume the interface does not exist */ |
222 | return IF2IP_NOT_FOUND; |
223 | } |
224 | |
225 | s = (struct sockaddr_in *)(void *)&req.ifr_addr; |
226 | memcpy(&in, &s->sin_addr, sizeof(in)); |
227 | r = Curl_inet_ntop(s->sin_family, &in, buf, buf_size); |
228 | |
229 | sclose(dummy); |
230 | if(!r) |
231 | return IF2IP_NOT_FOUND; |
232 | return IF2IP_FOUND; |
233 | } |
234 | |
235 | #else |
236 | |
237 | if2ip_result_t Curl_if2ip(int af, |
238 | #ifdef ENABLE_IPV6 |
239 | unsigned int remote_scope, |
240 | unsigned int local_scope_id, |
241 | #endif |
242 | const char *interf, |
243 | char *buf, int buf_size) |
244 | { |
245 | (void) af; |
246 | #ifdef ENABLE_IPV6 |
247 | (void) remote_scope; |
248 | (void) local_scope_id; |
249 | #endif |
250 | (void) interf; |
251 | (void) buf; |
252 | (void) buf_size; |
253 | return IF2IP_NOT_FOUND; |
254 | } |
255 | |
256 | #endif |
257 | |