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: #include "sudo_debug.h"
87:
88: #define DEFAULT_TEXT_DOMAIN "sudo"
89: #include "gettext.h"
90:
91: /* Minix apparently lacks IFF_LOOPBACK */
92: #ifndef IFF_LOOPBACK
93: # define IFF_LOOPBACK 0
94: #endif
95:
96: #ifndef INET6_ADDRSTRLEN
97: # define INET6_ADDRSTRLEN 46
98: #endif
99:
100: #ifdef HAVE_GETIFADDRS
101:
102: /*
103: * Fill in the interfaces string with the machine's ip addresses and netmasks
104: * and return the number of interfaces found.
105: */
106: int
107: get_net_ifs(char **addrinfo)
108: {
109: struct ifaddrs *ifa, *ifaddrs;
110: struct sockaddr_in *sin;
111: #ifdef HAVE_STRUCT_IN6_ADDR
112: struct sockaddr_in6 *sin6;
113: char addrbuf[INET6_ADDRSTRLEN];
114: #endif
115: int ailen, i, len, num_interfaces = 0;
116: char *cp;
117: debug_decl(get_net_ifs, SUDO_DEBUG_NETIF)
118:
119: if (getifaddrs(&ifaddrs))
120: debug_return_int(0);
121:
122: /* Allocate space for the interfaces info string. */
123: for (ifa = ifaddrs; ifa != NULL; ifa = ifa -> ifa_next) {
124: /* Skip interfaces marked "down" and "loopback". */
125: if (ifa->ifa_addr == NULL || ifa->ifa_netmask == NULL ||
126: !ISSET(ifa->ifa_flags, IFF_UP) || ISSET(ifa->ifa_flags, IFF_LOOPBACK))
127: continue;
128:
129: switch (ifa->ifa_addr->sa_family) {
130: case AF_INET:
131: #ifdef HAVE_STRUCT_IN6_ADDR
132: case AF_INET6:
133: #endif
134: num_interfaces++;
135: break;
136: }
137: }
138: if (num_interfaces == 0)
139: debug_return_int(0);
140: ailen = num_interfaces * 2 * INET6_ADDRSTRLEN;
141: *addrinfo = cp = emalloc(ailen);
142:
143: /* Store the IP addr/netmask pairs. */
144: for (ifa = ifaddrs, i = 0; ifa != NULL; ifa = ifa -> ifa_next) {
145: /* Skip interfaces marked "down" and "loopback". */
146: if (ifa->ifa_addr == NULL || ifa->ifa_netmask == NULL ||
147: !ISSET(ifa->ifa_flags, IFF_UP) || ISSET(ifa->ifa_flags, IFF_LOOPBACK))
148: continue;
149:
150: switch (ifa->ifa_addr->sa_family) {
151: case AF_INET:
152: sin = (struct sockaddr_in *)ifa->ifa_addr;
153: len = snprintf(cp, ailen - (*addrinfo - cp),
154: "%s%s/", cp == *addrinfo ? "" : " ",
155: inet_ntoa(sin->sin_addr));
156: if (len <= 0 || len >= ailen - (*addrinfo - cp)) {
157: warningx(_("load_interfaces: overflow detected"));
158: goto done;
159: }
160: cp += len;
161:
162: sin = (struct sockaddr_in *)ifa->ifa_netmask;
163: len = snprintf(cp, ailen - (*addrinfo - cp),
164: "%s", inet_ntoa(sin->sin_addr));
165: if (len <= 0 || len >= ailen - (*addrinfo - cp)) {
166: warningx(_("load_interfaces: overflow detected"));
167: goto done;
168: }
169: cp += len;
170: break;
171: #ifdef HAVE_STRUCT_IN6_ADDR
172: case AF_INET6:
173: sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
174: inet_ntop(AF_INET6, &sin6->sin6_addr, addrbuf, sizeof(addrbuf));
175: len = snprintf(cp, ailen - (*addrinfo - cp),
176: "%s%s/", cp == *addrinfo ? "" : " ", addrbuf);
177: if (len <= 0 || len >= ailen - (*addrinfo - cp)) {
178: warningx(_("load_interfaces: overflow detected"));
179: goto done;
180: }
181: cp += len;
182:
183: sin6 = (struct sockaddr_in6 *)ifa->ifa_netmask;
184: inet_ntop(AF_INET6, &sin6->sin6_addr, addrbuf, sizeof(addrbuf));
185: len = snprintf(cp, ailen - (*addrinfo - cp), "%s", addrbuf);
186: if (len <= 0 || len >= ailen - (*addrinfo - cp)) {
187: warningx(_("load_interfaces: overflow detected"));
188: goto done;
189: }
190: cp += len;
191: break;
192: #endif /* HAVE_STRUCT_IN6_ADDR */
193: }
194: }
195:
196: done:
197: #ifdef HAVE_FREEIFADDRS
198: freeifaddrs(ifaddrs);
199: #else
200: efree(ifaddrs);
201: #endif
202: debug_return_int(num_interfaces);
203: }
204:
205: #elif defined(SIOCGIFCONF) && !defined(STUB_LOAD_INTERFACES)
206:
207: /*
208: * Allocate and fill in the interfaces global variable with the
209: * machine's ip addresses and netmasks.
210: */
211: int
212: get_net_ifs(char **addrinfo)
213: {
214: struct ifconf *ifconf;
215: struct ifreq *ifr, ifr_tmp;
216: struct sockaddr_in *sin;
217: int ailen, i, len, n, sock, num_interfaces = 0;
218: size_t buflen = sizeof(struct ifconf) + BUFSIZ;
219: char *cp, *previfname = "", *ifconf_buf = NULL;
220: #ifdef _ISC
221: struct strioctl strioctl;
222: #endif /* _ISC */
223: debug_decl(get_net_ifs, SUDO_DEBUG_NETIF)
224:
225: sock = socket(AF_INET, SOCK_DGRAM, 0);
226: if (sock < 0)
227: error(1, _("unable to open socket"));
228:
229: /*
230: * Get interface configuration or return.
231: */
232: for (;;) {
233: ifconf_buf = emalloc(buflen);
234: ifconf = (struct ifconf *) ifconf_buf;
235: ifconf->ifc_len = buflen - sizeof(struct ifconf);
236: ifconf->ifc_buf = (caddr_t) (ifconf_buf + sizeof(struct ifconf));
237:
238: #ifdef _ISC
239: STRSET(SIOCGIFCONF, (caddr_t) ifconf, buflen);
240: if (ioctl(sock, I_STR, (caddr_t) &strioctl) < 0)
241: #else
242: /* Note that some kernels return EINVAL if the buffer is too small */
243: if (ioctl(sock, SIOCGIFCONF, (caddr_t) ifconf) < 0 && errno != EINVAL)
244: #endif /* _ISC */
245: goto done;
246:
247: /* Break out of loop if we have a big enough buffer. */
248: if (ifconf->ifc_len + sizeof(struct ifreq) < buflen)
249: break;
250: buflen += BUFSIZ;
251: efree(ifconf_buf);
252: }
253:
254: /* Allocate space for the maximum number of interfaces that could exist. */
255: if ((n = ifconf->ifc_len / sizeof(struct ifreq)) == 0)
256: debug_return_int(0);
257: ailen = n * 2 * INET6_ADDRSTRLEN;
258: *addrinfo = cp = emalloc(ailen);
259:
260: /* For each interface, store the ip address and netmask. */
261: for (i = 0; i < ifconf->ifc_len; ) {
262: /* Get a pointer to the current interface. */
263: ifr = (struct ifreq *) &ifconf->ifc_buf[i];
264:
265: /* Set i to the subscript of the next interface. */
266: i += sizeof(struct ifreq);
267: #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
268: if (ifr->ifr_addr.sa_len > sizeof(ifr->ifr_addr))
269: i += ifr->ifr_addr.sa_len - sizeof(struct sockaddr);
270: #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */
271:
272: /* Skip duplicates and interfaces with NULL addresses. */
273: sin = (struct sockaddr_in *) &ifr->ifr_addr;
274: if (sin->sin_addr.s_addr == 0 ||
275: strncmp(previfname, ifr->ifr_name, sizeof(ifr->ifr_name) - 1) == 0)
276: continue;
277:
278: if (ifr->ifr_addr.sa_family != AF_INET)
279: continue;
280:
281: #ifdef SIOCGIFFLAGS
282: memset(&ifr_tmp, 0, sizeof(ifr_tmp));
283: strncpy(ifr_tmp.ifr_name, ifr->ifr_name, sizeof(ifr_tmp.ifr_name) - 1);
284: if (ioctl(sock, SIOCGIFFLAGS, (caddr_t) &ifr_tmp) < 0)
285: #endif
286: ifr_tmp = *ifr;
287:
288: /* Skip interfaces marked "down" and "loopback". */
289: if (!ISSET(ifr_tmp.ifr_flags, IFF_UP) ||
290: ISSET(ifr_tmp.ifr_flags, IFF_LOOPBACK))
291: continue;
292:
293: sin = (struct sockaddr_in *) &ifr->ifr_addr;
294: len = snprintf(cp, ailen - (*addrinfo - cp),
295: "%s%s/", cp == *addrinfo ? "" : " ",
296: inet_ntoa(sin->sin_addr));
297: if (len <= 0 || len >= ailen - (*addrinfo - cp)) {
298: warningx(_("load_interfaces: overflow detected"));
299: goto done;
300: }
301: cp += len;
302:
303: /* Stash the name of the interface we saved. */
304: previfname = ifr->ifr_name;
305:
306: /* Get the netmask. */
307: memset(&ifr_tmp, 0, sizeof(ifr_tmp));
308: strncpy(ifr_tmp.ifr_name, ifr->ifr_name, sizeof(ifr_tmp.ifr_name) - 1);
309: #ifdef _ISC
310: STRSET(SIOCGIFNETMASK, (caddr_t) &ifr_tmp, sizeof(ifr_tmp));
311: if (ioctl(sock, I_STR, (caddr_t) &strioctl) < 0) {
312: #else
313: if (ioctl(sock, SIOCGIFNETMASK, (caddr_t) &ifr_tmp) < 0) {
314: #endif /* _ISC */
315: sin = (struct sockaddr_in *) &ifr_tmp.ifr_addr;
316: sin->sin_addr.s_addr = htonl(IN_CLASSC_NET);
317: }
318: sin = (struct sockaddr_in *) &ifr_tmp.ifr_addr;
319: len = snprintf(cp, ailen - (*addrinfo - cp),
320: "%s", inet_ntoa(sin->sin_addr));
321: if (len <= 0 || len >= ailen - (*addrinfo - cp)) {
322: warningx(_("load_interfaces: overflow detected"));
323: goto done;
324: }
325: cp += len;
326: num_interfaces++;
327: }
328:
329: done:
330: efree(ifconf_buf);
331: (void) close(sock);
332:
333: debug_return_int(num_interfaces);
334: }
335:
336: #else /* !SIOCGIFCONF || STUB_LOAD_INTERFACES */
337:
338: /*
339: * Stub function for those without SIOCGIFCONF or getifaddrs()
340: */
341: int
342: get_net_ifs(char **addrinfo)
343: {
344: debug_decl(get_net_ifs, SUDO_DEBUG_NETIF)
345: debug_return_int(0);
346: }
347:
348: #endif /* SIOCGIFCONF && !STUB_LOAD_INTERFACES */
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