1: /*
2: * Copyright (c) 1996, 1998-2005, 2007-2010
3: * Todd C. Miller <Todd.Miller@courtesan.com>
4: *
5: * Permission to use, copy, modify, and distribute this software for any
6: * purpose with or without fee is hereby granted, provided that the above
7: * copyright notice and this permission notice appear in all copies.
8: *
9: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16: *
17: * Sponsored in part by the Defense Advanced Research Projects
18: * Agency (DARPA) and Air Force Research Laboratory, Air Force
19: * Materiel Command, USAF, under agreement number F39502-99-1-0512.
20: */
21:
22: /*
23: * Suppress a warning w/ gcc on Digital UN*X.
24: * The system headers should really do this....
25: */
26: #if defined(__osf__) && !defined(__cplusplus)
27: struct mbuf;
28: struct rtentry;
29: #endif
30:
31: #include <config.h>
32:
33: #include <sys/types.h>
34: #include <sys/socket.h>
35: #include <sys/param.h>
36: #include <sys/time.h>
37: #include <sys/ioctl.h>
38: #if defined(HAVE_SYS_SOCKIO_H) && !defined(SIOCGIFCONF)
39: # include <sys/sockio.h>
40: #endif
41: #include <stdio.h>
42: #ifdef STDC_HEADERS
43: # include <stdlib.h>
44: # include <stddef.h>
45: #else
46: # ifdef HAVE_STDLIB_H
47: # include <stdlib.h>
48: # endif
49: #endif /* STDC_HEADERS */
50: #ifdef HAVE_STRING_H
51: # if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
52: # include <memory.h>
53: # endif
54: # include <string.h>
55: #endif /* HAVE_STRING_H */
56: #ifdef HAVE_STRINGS_H
57: # include <strings.h>
58: #endif /* HAVE_STRINGS_H */
59: #ifdef HAVE_UNISTD_H
60: # include <unistd.h>
61: #endif /* HAVE_UNISTD_H */
62: #include <netdb.h>
63: #include <errno.h>
64: #ifdef _ISC
65: # include <sys/stream.h>
66: # include <sys/sioctl.h>
67: # include <sys/stropts.h>
68: # define STRSET(cmd, param, len) {strioctl.ic_cmd=(cmd);\
69: strioctl.ic_dp=(param);\
70: strioctl.ic_timout=0;\
71: strioctl.ic_len=(len);}
72: #endif /* _ISC */
73: #ifdef _MIPS
74: # include <net/soioctl.h>
75: #endif /* _MIPS */
76: #include <netinet/in.h>
77: #include <arpa/inet.h>
78: #include <net/if.h>
79: #ifdef HAVE_GETIFADDRS
80: # include <ifaddrs.h>
81: #endif
82:
83: #include "missing.h"
84: #include "alloc.h"
85: #include "error.h"
86:
87: #define DEFAULT_TEXT_DOMAIN "sudo"
88: #include "gettext.h"
89:
90: /* Minix apparently lacks IFF_LOOPBACK */
91: #ifndef IFF_LOOPBACK
92: # define IFF_LOOPBACK 0
93: #endif
94:
95: #ifndef INET6_ADDRSTRLEN
96: # define INET6_ADDRSTRLEN 46
97: #endif
98:
99: #ifdef HAVE_GETIFADDRS
100:
101: /*
102: * Fill in the interfaces string with the machine's ip addresses and netmasks
103: * and return the number of interfaces found.
104: */
105: int
106: get_net_ifs(char **addrinfo)
107: {
108: struct ifaddrs *ifa, *ifaddrs;
109: struct sockaddr_in *sin;
110: #ifdef HAVE_IN6_ADDR
111: struct sockaddr_in6 *sin6;
112: char addrbuf[INET6_ADDRSTRLEN];
113: #endif
114: int ailen, i, len, num_interfaces = 0;
115: char *cp;
116:
117: if (getifaddrs(&ifaddrs))
118: return 0;
119:
120: /* Allocate space for the interfaces info string. */
121: for (ifa = ifaddrs; ifa != NULL; ifa = ifa -> ifa_next) {
122: /* Skip interfaces marked "down" and "loopback". */
123: if (ifa->ifa_addr == NULL || ifa->ifa_netmask == NULL ||
124: !ISSET(ifa->ifa_flags, IFF_UP) || ISSET(ifa->ifa_flags, IFF_LOOPBACK))
125: continue;
126:
127: switch (ifa->ifa_addr->sa_family) {
128: case AF_INET:
129: #ifdef HAVE_IN6_ADDR
130: case AF_INET6:
131: #endif
132: num_interfaces++;
133: break;
134: }
135: }
136: if (num_interfaces == 0)
137: return 0;
138: ailen = num_interfaces * 2 * INET6_ADDRSTRLEN;
139: *addrinfo = cp = emalloc(ailen);
140:
141: /* Store the IP addr/netmask pairs. */
142: for (ifa = ifaddrs, i = 0; ifa != NULL; ifa = ifa -> ifa_next) {
143: /* Skip interfaces marked "down" and "loopback". */
144: if (ifa->ifa_addr == NULL || ifa->ifa_netmask == NULL ||
145: !ISSET(ifa->ifa_flags, IFF_UP) || ISSET(ifa->ifa_flags, IFF_LOOPBACK))
146: continue;
147:
148: switch (ifa->ifa_addr->sa_family) {
149: case AF_INET:
150: sin = (struct sockaddr_in *)ifa->ifa_addr;
151: len = snprintf(cp, ailen - (*addrinfo - cp),
152: "%s%s/", cp == *addrinfo ? "" : " ",
153: inet_ntoa(sin->sin_addr));
154: if (len <= 0 || len >= ailen - (*addrinfo - cp)) {
155: warningx(_("load_interfaces: overflow detected"));
156: goto done;
157: }
158: cp += len;
159:
160: sin = (struct sockaddr_in *)ifa->ifa_netmask;
161: len = snprintf(cp, ailen - (*addrinfo - cp),
162: "%s", inet_ntoa(sin->sin_addr));
163: if (len <= 0 || len >= ailen - (*addrinfo - cp)) {
164: warningx(_("load_interfaces: overflow detected"));
165: goto done;
166: }
167: cp += len;
168: break;
169: #ifdef HAVE_IN6_ADDR
170: case AF_INET6:
171: sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
172: inet_ntop(AF_INET6, &sin6->sin6_addr, addrbuf, sizeof(addrbuf));
173: len = snprintf(cp, ailen - (*addrinfo - cp),
174: "%s%s/", cp == *addrinfo ? "" : " ", addrbuf);
175: if (len <= 0 || len >= ailen - (*addrinfo - cp)) {
176: warningx(_("load_interfaces: overflow detected"));
177: goto done;
178: }
179: cp += len;
180:
181: sin6 = (struct sockaddr_in6 *)ifa->ifa_netmask;
182: inet_ntop(AF_INET6, &sin6->sin6_addr, addrbuf, sizeof(addrbuf));
183: len = snprintf(cp, ailen - (*addrinfo - cp), "%s", addrbuf);
184: if (len <= 0 || len >= ailen - (*addrinfo - cp)) {
185: warningx(_("load_interfaces: overflow detected"));
186: goto done;
187: }
188: cp += len;
189: break;
190: #endif /* HAVE_IN6_ADDR */
191: }
192: }
193:
194: done:
195: #ifdef HAVE_FREEIFADDRS
196: freeifaddrs(ifaddrs);
197: #else
198: efree(ifaddrs);
199: #endif
200: return num_interfaces;
201: }
202:
203: #elif defined(SIOCGIFCONF) && !defined(STUB_LOAD_INTERFACES)
204:
205: /*
206: * Allocate and fill in the interfaces global variable with the
207: * machine's ip addresses and netmasks.
208: */
209: int
210: get_net_ifs(char **addrinfo)
211: {
212: struct ifconf *ifconf;
213: struct ifreq *ifr, ifr_tmp;
214: struct sockaddr_in *sin;
215: int ailen, i, len, n, sock, num_interfaces = 0;
216: size_t buflen = sizeof(struct ifconf) + BUFSIZ;
217: char *cp, *previfname = "", *ifconf_buf = NULL;
218: #ifdef _ISC
219: struct strioctl strioctl;
220: #endif /* _ISC */
221:
222: sock = socket(AF_INET, SOCK_DGRAM, 0);
223: if (sock < 0)
224: error(1, _("unable to open socket"));
225:
226: /*
227: * Get interface configuration or return.
228: */
229: for (;;) {
230: ifconf_buf = emalloc(buflen);
231: ifconf = (struct ifconf *) ifconf_buf;
232: ifconf->ifc_len = buflen - sizeof(struct ifconf);
233: ifconf->ifc_buf = (caddr_t) (ifconf_buf + sizeof(struct ifconf));
234:
235: #ifdef _ISC
236: STRSET(SIOCGIFCONF, (caddr_t) ifconf, buflen);
237: if (ioctl(sock, I_STR, (caddr_t) &strioctl) < 0)
238: #else
239: /* Note that some kernels return EINVAL if the buffer is too small */
240: if (ioctl(sock, SIOCGIFCONF, (caddr_t) ifconf) < 0 && errno != EINVAL)
241: #endif /* _ISC */
242: goto done;
243:
244: /* Break out of loop if we have a big enough buffer. */
245: if (ifconf->ifc_len + sizeof(struct ifreq) < buflen)
246: break;
247: buflen += BUFSIZ;
248: efree(ifconf_buf);
249: }
250:
251: /* Allocate space for the maximum number of interfaces that could exist. */
252: if ((n = ifconf->ifc_len / sizeof(struct ifreq)) == 0)
253: return 0;
254: ailen = n * 2 * INET6_ADDRSTRLEN;
255: *addrinfo = cp = emalloc(ailen);
256:
257: /* For each interface, store the ip address and netmask. */
258: for (i = 0; i < ifconf->ifc_len; ) {
259: /* Get a pointer to the current interface. */
260: ifr = (struct ifreq *) &ifconf->ifc_buf[i];
261:
262: /* Set i to the subscript of the next interface. */
263: i += sizeof(struct ifreq);
264: #ifdef HAVE_SA_LEN
265: if (ifr->ifr_addr.sa_len > sizeof(ifr->ifr_addr))
266: i += ifr->ifr_addr.sa_len - sizeof(struct sockaddr);
267: #endif /* HAVE_SA_LEN */
268:
269: /* Skip duplicates and interfaces with NULL addresses. */
270: sin = (struct sockaddr_in *) &ifr->ifr_addr;
271: if (sin->sin_addr.s_addr == 0 ||
272: strncmp(previfname, ifr->ifr_name, sizeof(ifr->ifr_name) - 1) == 0)
273: continue;
274:
275: if (ifr->ifr_addr.sa_family != AF_INET)
276: continue;
277:
278: #ifdef SIOCGIFFLAGS
279: memset(&ifr_tmp, 0, sizeof(ifr_tmp));
280: strncpy(ifr_tmp.ifr_name, ifr->ifr_name, sizeof(ifr_tmp.ifr_name) - 1);
281: if (ioctl(sock, SIOCGIFFLAGS, (caddr_t) &ifr_tmp) < 0)
282: #endif
283: ifr_tmp = *ifr;
284:
285: /* Skip interfaces marked "down" and "loopback". */
286: if (!ISSET(ifr_tmp.ifr_flags, IFF_UP) ||
287: ISSET(ifr_tmp.ifr_flags, IFF_LOOPBACK))
288: continue;
289:
290: sin = (struct sockaddr_in *) &ifr->ifr_addr;
291: len = snprintf(cp, ailen - (*addrinfo - cp),
292: "%s%s/", cp == *addrinfo ? "" : " ",
293: inet_ntoa(sin->sin_addr));
294: if (len <= 0 || len >= ailen - (*addrinfo - cp)) {
295: warningx(_("load_interfaces: overflow detected"));
296: goto done;
297: }
298: cp += len;
299:
300: /* Stash the name of the interface we saved. */
301: previfname = ifr->ifr_name;
302:
303: /* Get the netmask. */
304: memset(&ifr_tmp, 0, sizeof(ifr_tmp));
305: strncpy(ifr_tmp.ifr_name, ifr->ifr_name, sizeof(ifr_tmp.ifr_name) - 1);
306: #ifdef _ISC
307: STRSET(SIOCGIFNETMASK, (caddr_t) &ifr_tmp, sizeof(ifr_tmp));
308: if (ioctl(sock, I_STR, (caddr_t) &strioctl) < 0) {
309: #else
310: if (ioctl(sock, SIOCGIFNETMASK, (caddr_t) &ifr_tmp) < 0) {
311: #endif /* _ISC */
312: sin = (struct sockaddr_in *) &ifr_tmp.ifr_addr;
313: sin->sin_addr.s_addr = htonl(IN_CLASSC_NET);
314: }
315: sin = (struct sockaddr_in *) &ifr_tmp.ifr_addr;
316: len = snprintf(cp, ailen - (*addrinfo - cp),
317: "%s", inet_ntoa(sin->sin_addr));
318: if (len <= 0 || len >= ailen - (*addrinfo - cp)) {
319: warningx(_("load_interfaces: overflow detected"));
320: goto done;
321: }
322: cp += len;
323: num_interfaces++;
324: }
325:
326: done:
327: efree(ifconf_buf);
328: (void) close(sock);
329:
330: return num_interfaces;
331: }
332:
333: #else /* !SIOCGIFCONF || STUB_LOAD_INTERFACES */
334:
335: /*
336: * Stub function for those without SIOCGIFCONF or getifaddrs()
337: */
338: int
339: get_net_ifs(char **addrinfo)
340: {
341: return 0;
342: }
343:
344: #endif /* SIOCGIFCONF && !STUB_LOAD_INTERFACES */
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