1 | /*************************************************************************** |
2 | * _ _ ____ _ |
3 | * Project ___| | | | _ \| | |
4 | * / __| | | | |_) | | |
5 | * | (__| |_| | _ <| |___ |
6 | * \___|\___/|_| \_\_____| |
7 | * |
8 | * Copyright (C) 1998 - 2019, 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. */ |
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 | 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 | #endif |
92 | |
93 | return IPV6_SCOPE_GLOBAL; |
94 | } |
95 | |
96 | |
97 | #if defined(HAVE_GETIFADDRS) |
98 | |
99 | if2ip_result_t Curl_if2ip(int af, unsigned int remote_scope, |
100 | unsigned int local_scope_id, const char *interf, |
101 | char *buf, int buf_size) |
102 | { |
103 | struct ifaddrs *iface, *head; |
104 | if2ip_result_t res = IF2IP_NOT_FOUND; |
105 | |
106 | #ifndef ENABLE_IPV6 |
107 | (void) remote_scope; |
108 | #endif |
109 | |
110 | #if !defined(HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID) || \ |
111 | !defined(ENABLE_IPV6) |
112 | (void) local_scope_id; |
113 | #endif |
114 | |
115 | if(getifaddrs(&head) >= 0) { |
116 | for(iface = head; iface != NULL; iface = iface->ifa_next) { |
117 | if(iface->ifa_addr != NULL) { |
118 | if(iface->ifa_addr->sa_family == af) { |
119 | if(strcasecompare(iface->ifa_name, interf)) { |
120 | void *addr; |
121 | char *ip; |
122 | char scope[12] = "" ; |
123 | char ipstr[64]; |
124 | #ifdef ENABLE_IPV6 |
125 | if(af == AF_INET6) { |
126 | #ifdef HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID |
127 | unsigned int scopeid = 0; |
128 | #endif |
129 | unsigned int ifscope = Curl_ipv6_scope(iface->ifa_addr); |
130 | |
131 | if(ifscope != remote_scope) { |
132 | /* We are interested only in interface addresses whose |
133 | scope matches the remote address we want to |
134 | connect to: global for global, link-local for |
135 | link-local, etc... */ |
136 | if(res == IF2IP_NOT_FOUND) res = IF2IP_AF_NOT_SUPPORTED; |
137 | continue; |
138 | } |
139 | |
140 | addr = |
141 | &((struct sockaddr_in6 *)(void *)iface->ifa_addr)->sin6_addr; |
142 | #ifdef HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID |
143 | /* Include the scope of this interface as part of the address */ |
144 | scopeid = ((struct sockaddr_in6 *)(void *)iface->ifa_addr) |
145 | ->sin6_scope_id; |
146 | |
147 | /* If given, scope id should match. */ |
148 | if(local_scope_id && scopeid != local_scope_id) { |
149 | if(res == IF2IP_NOT_FOUND) |
150 | res = IF2IP_AF_NOT_SUPPORTED; |
151 | |
152 | continue; |
153 | } |
154 | |
155 | if(scopeid) |
156 | msnprintf(scope, sizeof(scope), "%%%u" , scopeid); |
157 | #endif |
158 | } |
159 | else |
160 | #endif |
161 | addr = |
162 | &((struct sockaddr_in *)(void *)iface->ifa_addr)->sin_addr; |
163 | res = IF2IP_FOUND; |
164 | ip = (char *) Curl_inet_ntop(af, addr, ipstr, sizeof(ipstr)); |
165 | msnprintf(buf, buf_size, "%s%s" , ip, scope); |
166 | break; |
167 | } |
168 | } |
169 | else if((res == IF2IP_NOT_FOUND) && |
170 | strcasecompare(iface->ifa_name, interf)) { |
171 | res = IF2IP_AF_NOT_SUPPORTED; |
172 | } |
173 | } |
174 | } |
175 | |
176 | freeifaddrs(head); |
177 | } |
178 | |
179 | return res; |
180 | } |
181 | |
182 | #elif defined(HAVE_IOCTL_SIOCGIFADDR) |
183 | |
184 | if2ip_result_t Curl_if2ip(int af, unsigned int remote_scope, |
185 | unsigned int local_scope_id, const char *interf, |
186 | char *buf, int buf_size) |
187 | { |
188 | struct ifreq req; |
189 | struct in_addr in; |
190 | struct sockaddr_in *s; |
191 | curl_socket_t dummy; |
192 | size_t len; |
193 | |
194 | (void)remote_scope; |
195 | (void)local_scope_id; |
196 | |
197 | if(!interf || (af != AF_INET)) |
198 | return IF2IP_NOT_FOUND; |
199 | |
200 | len = strlen(interf); |
201 | if(len >= sizeof(req.ifr_name)) |
202 | return IF2IP_NOT_FOUND; |
203 | |
204 | dummy = socket(AF_INET, SOCK_STREAM, 0); |
205 | if(CURL_SOCKET_BAD == dummy) |
206 | return IF2IP_NOT_FOUND; |
207 | |
208 | memset(&req, 0, sizeof(req)); |
209 | memcpy(req.ifr_name, interf, len + 1); |
210 | req.ifr_addr.sa_family = AF_INET; |
211 | |
212 | if(ioctl(dummy, SIOCGIFADDR, &req) < 0) { |
213 | sclose(dummy); |
214 | /* With SIOCGIFADDR, we cannot tell the difference between an interface |
215 | that does not exist and an interface that has no address of the |
216 | correct family. Assume the interface does not exist */ |
217 | return IF2IP_NOT_FOUND; |
218 | } |
219 | |
220 | s = (struct sockaddr_in *)(void *)&req.ifr_addr; |
221 | memcpy(&in, &s->sin_addr, sizeof(in)); |
222 | Curl_inet_ntop(s->sin_family, &in, buf, buf_size); |
223 | |
224 | sclose(dummy); |
225 | return IF2IP_FOUND; |
226 | } |
227 | |
228 | #else |
229 | |
230 | if2ip_result_t Curl_if2ip(int af, unsigned int remote_scope, |
231 | unsigned int local_scope_id, const char *interf, |
232 | char *buf, int buf_size) |
233 | { |
234 | (void) af; |
235 | (void) remote_scope; |
236 | (void) local_scope_id; |
237 | (void) interf; |
238 | (void) buf; |
239 | (void) buf_size; |
240 | return IF2IP_NOT_FOUND; |
241 | } |
242 | |
243 | #endif |
244 | |