source: azure_iot_hub/trunk/curl-7.57.0/lib/if2ip.c@ 389

Last change on this file since 389 was 389, checked in by coas-nagasima, 5 years ago

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1/***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2017, 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. */
64unsigned 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
99bool Curl_if_is_interface_name(const char *interf)
100{
101 bool result = FALSE;
102
103 struct ifaddrs *iface, *head;
104
105 if(getifaddrs(&head) >= 0) {
106 for(iface=head; iface != NULL; iface=iface->ifa_next) {
107 if(strcasecompare(iface->ifa_name, interf)) {
108 result = TRUE;
109 break;
110 }
111 }
112 freeifaddrs(head);
113 }
114 return result;
115}
116
117if2ip_result_t Curl_if2ip(int af, unsigned int remote_scope,
118 unsigned int remote_scope_id, const char *interf,
119 char *buf, int buf_size)
120{
121 struct ifaddrs *iface, *head;
122 if2ip_result_t res = IF2IP_NOT_FOUND;
123
124#ifndef ENABLE_IPV6
125 (void) remote_scope;
126#endif
127
128#if !defined(HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID) || \
129 !defined(ENABLE_IPV6)
130 (void) remote_scope_id;
131#endif
132
133 if(getifaddrs(&head) >= 0) {
134 for(iface = head; iface != NULL; iface=iface->ifa_next) {
135 if(iface->ifa_addr != NULL) {
136 if(iface->ifa_addr->sa_family == af) {
137 if(strcasecompare(iface->ifa_name, interf)) {
138 void *addr;
139 char *ip;
140 char scope[12] = "";
141 char ipstr[64];
142#ifdef ENABLE_IPV6
143 if(af == AF_INET6) {
144 unsigned int scopeid = 0;
145 unsigned int ifscope = Curl_ipv6_scope(iface->ifa_addr);
146
147 if(ifscope != remote_scope) {
148 /* We are interested only in interface addresses whose
149 scope matches the remote address we want to
150 connect to: global for global, link-local for
151 link-local, etc... */
152 if(res == IF2IP_NOT_FOUND) res = IF2IP_AF_NOT_SUPPORTED;
153 continue;
154 }
155
156 addr =
157 &((struct sockaddr_in6 *)(void *)iface->ifa_addr)->sin6_addr;
158#ifdef HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID
159 /* Include the scope of this interface as part of the address */
160 scopeid = ((struct sockaddr_in6 *)(void *)iface->ifa_addr)
161 ->sin6_scope_id;
162
163 /* If given, scope id should match. */
164 if(remote_scope_id && scopeid != remote_scope_id) {
165 if(res == IF2IP_NOT_FOUND)
166 res = IF2IP_AF_NOT_SUPPORTED;
167
168 continue;
169 }
170#endif
171 if(scopeid)
172 snprintf(scope, sizeof(scope), "%%%u", scopeid);
173 }
174 else
175#endif
176 addr =
177 &((struct sockaddr_in *)(void *)iface->ifa_addr)->sin_addr;
178 res = IF2IP_FOUND;
179 ip = (char *) Curl_inet_ntop(af, addr, ipstr, sizeof(ipstr));
180 snprintf(buf, buf_size, "%s%s", ip, scope);
181 break;
182 }
183 }
184 else if((res == IF2IP_NOT_FOUND) &&
185 strcasecompare(iface->ifa_name, interf)) {
186 res = IF2IP_AF_NOT_SUPPORTED;
187 }
188 }
189 }
190
191 freeifaddrs(head);
192 }
193
194 return res;
195}
196
197#elif defined(HAVE_IOCTL_SIOCGIFADDR)
198
199bool Curl_if_is_interface_name(const char *interf)
200{
201 /* This is here just to support the old interfaces */
202 char buf[256];
203
204 return (Curl_if2ip(AF_INET, 0 /* unused */, 0, interf, buf, sizeof(buf)) ==
205 IF2IP_NOT_FOUND) ? FALSE : TRUE;
206}
207
208if2ip_result_t Curl_if2ip(int af, unsigned int remote_scope,
209 unsigned int remote_scope_id, const char *interf,
210 char *buf, int buf_size)
211{
212 struct ifreq req;
213 struct in_addr in;
214 struct sockaddr_in *s;
215 curl_socket_t dummy;
216 size_t len;
217
218 (void)remote_scope;
219 (void)remote_scope_id;
220
221 if(!interf || (af != AF_INET))
222 return IF2IP_NOT_FOUND;
223
224 len = strlen(interf);
225 if(len >= sizeof(req.ifr_name))
226 return IF2IP_NOT_FOUND;
227
228 dummy = socket(AF_INET, SOCK_STREAM, 0);
229 if(CURL_SOCKET_BAD == dummy)
230 return IF2IP_NOT_FOUND;
231
232 memset(&req, 0, sizeof(req));
233 memcpy(req.ifr_name, interf, len+1);
234 req.ifr_addr.sa_family = AF_INET;
235
236 if(ioctl(dummy, SIOCGIFADDR, &req) < 0) {
237 sclose(dummy);
238 /* With SIOCGIFADDR, we cannot tell the difference between an interface
239 that does not exist and an interface that has no address of the
240 correct family. Assume the interface does not exist */
241 return IF2IP_NOT_FOUND;
242 }
243
244 s = (struct sockaddr_in *)(void *)&req.ifr_addr;
245 memcpy(&in, &s->sin_addr, sizeof(in));
246 Curl_inet_ntop(s->sin_family, &in, buf, buf_size);
247
248 sclose(dummy);
249 return IF2IP_FOUND;
250}
251
252#else
253
254bool Curl_if_is_interface_name(const char *interf)
255{
256 (void) interf;
257
258 return FALSE;
259}
260
261if2ip_result_t Curl_if2ip(int af, unsigned int remote_scope,
262 unsigned int remote_scope_id, const char *interf,
263 char *buf, int buf_size)
264{
265 (void) af;
266 (void) remote_scope;
267 (void) remote_scope_id;
268 (void) interf;
269 (void) buf;
270 (void) buf_size;
271 return IF2IP_NOT_FOUND;
272}
273
274#endif
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