1: /*
2: * Copyright (c) 1996, 1998-2005, 2007-2013
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/time.h>
36: #include <sys/ioctl.h>
37: #if defined(HAVE_SYS_SOCKIO_H) && !defined(SIOCGIFCONF)
38: # include <sys/sockio.h>
39: #endif
40: #include <stdio.h>
41: #ifdef STDC_HEADERS
42: # include <stdlib.h>
43: # include <stddef.h>
44: #else
45: # ifdef HAVE_STDLIB_H
46: # include <stdlib.h>
47: # endif
48: #endif /* STDC_HEADERS */
49: #ifdef HAVE_STRING_H
50: # if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
51: # include <memory.h>
52: # endif
53: # include <string.h>
54: #endif /* HAVE_STRING_H */
55: #ifdef HAVE_STRINGS_H
56: # include <strings.h>
57: #endif /* HAVE_STRINGS_H */
58: #ifdef HAVE_UNISTD_H
59: # include <unistd.h>
60: #endif /* HAVE_UNISTD_H */
61: #include <netdb.h>
62: #include <errno.h>
63: #ifdef _ISC
64: # include <sys/stream.h>
65: # include <sys/sioctl.h>
66: # include <sys/stropts.h>
67: # define STRSET(cmd, param, len) {strioctl.ic_cmd=(cmd);\
68: strioctl.ic_dp=(param);\
69: strioctl.ic_timout=0;\
70: strioctl.ic_len=(len);}
71: #endif /* _ISC */
72: #ifdef _MIPS
73: # include <net/soioctl.h>
74: #endif /* _MIPS */
75: #include <netinet/in.h>
76: #include <arpa/inet.h>
77: #include <net/if.h>
78: #ifdef HAVE_GETIFADDRS
79: # include <ifaddrs.h>
80: #endif
81:
82: #include "missing.h"
83: #include "alloc.h"
84: #include "fatal.h"
85: #include "sudo_debug.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_STRUCT_IN6_ADDR
111: struct sockaddr_in6 *sin6;
112: char addrbuf[INET6_ADDRSTRLEN];
113: #endif
114: int ailen, len, num_interfaces = 0;
115: char *cp;
116: debug_decl(get_net_ifs, SUDO_DEBUG_NETIF)
117:
118: if (getifaddrs(&ifaddrs))
119: debug_return_int(0);
120:
121: /* Allocate space for the interfaces info string. */
122: for (ifa = ifaddrs; ifa != NULL; ifa = ifa -> ifa_next) {
123: /* Skip interfaces marked "down" and "loopback". */
124: if (ifa->ifa_addr == NULL || ifa->ifa_netmask == NULL ||
125: !ISSET(ifa->ifa_flags, IFF_UP) || ISSET(ifa->ifa_flags, IFF_LOOPBACK))
126: continue;
127:
128: switch (ifa->ifa_addr->sa_family) {
129: case AF_INET:
130: #ifdef HAVE_STRUCT_IN6_ADDR
131: case AF_INET6:
132: #endif
133: num_interfaces++;
134: break;
135: }
136: }
137: if (num_interfaces == 0)
138: debug_return_int(0);
139: ailen = num_interfaces * 2 * INET6_ADDRSTRLEN;
140: *addrinfo = cp = emalloc(ailen);
141:
142: /* Store the IP addr/netmask pairs. */
143: for (ifa = ifaddrs; ifa != NULL; ifa = ifa -> ifa_next) {
144: /* Skip interfaces marked "down" and "loopback". */
145: if (ifa->ifa_addr == NULL || ifa->ifa_netmask == NULL ||
146: !ISSET(ifa->ifa_flags, IFF_UP) || ISSET(ifa->ifa_flags, IFF_LOOPBACK))
147: continue;
148:
149: switch (ifa->ifa_addr->sa_family) {
150: case AF_INET:
151: sin = (struct sockaddr_in *)ifa->ifa_addr;
152: len = snprintf(cp, ailen - (*addrinfo - cp),
153: "%s%s/", cp == *addrinfo ? "" : " ",
154: inet_ntoa(sin->sin_addr));
155: if (len <= 0 || len >= ailen - (*addrinfo - cp)) {
156: warningx(_("load_interfaces: overflow detected"));
157: goto done;
158: }
159: cp += len;
160:
161: sin = (struct sockaddr_in *)ifa->ifa_netmask;
162: len = snprintf(cp, ailen - (*addrinfo - cp),
163: "%s", inet_ntoa(sin->sin_addr));
164: if (len <= 0 || len >= ailen - (*addrinfo - cp)) {
165: warningx(_("load_interfaces: overflow detected"));
166: goto done;
167: }
168: cp += len;
169: break;
170: #ifdef HAVE_STRUCT_IN6_ADDR
171: case AF_INET6:
172: sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
173: inet_ntop(AF_INET6, &sin6->sin6_addr, addrbuf, sizeof(addrbuf));
174: len = snprintf(cp, ailen - (*addrinfo - cp),
175: "%s%s/", cp == *addrinfo ? "" : " ", addrbuf);
176: if (len <= 0 || len >= ailen - (*addrinfo - cp)) {
177: warningx(_("load_interfaces: overflow detected"));
178: goto done;
179: }
180: cp += len;
181:
182: sin6 = (struct sockaddr_in6 *)ifa->ifa_netmask;
183: inet_ntop(AF_INET6, &sin6->sin6_addr, addrbuf, sizeof(addrbuf));
184: len = snprintf(cp, ailen - (*addrinfo - cp), "%s", addrbuf);
185: if (len <= 0 || len >= ailen - (*addrinfo - cp)) {
186: warningx(_("load_interfaces: overflow detected"));
187: goto done;
188: }
189: cp += len;
190: break;
191: #endif /* HAVE_STRUCT_IN6_ADDR */
192: }
193: }
194:
195: done:
196: #ifdef HAVE_FREEIFADDRS
197: freeifaddrs(ifaddrs);
198: #else
199: efree(ifaddrs);
200: #endif
201: debug_return_int(num_interfaces);
202: }
203:
204: #elif defined(SIOCGIFCONF) && !defined(STUB_LOAD_INTERFACES)
205:
206: /*
207: * Allocate and fill in the interfaces global variable with the
208: * machine's ip addresses and netmasks.
209: */
210: int
211: get_net_ifs(char **addrinfo)
212: {
213: struct ifconf *ifconf;
214: struct ifreq *ifr, ifr_tmp;
215: struct sockaddr_in *sin;
216: int ailen, i, len, n, sock, num_interfaces = 0;
217: size_t buflen = sizeof(struct ifconf) + BUFSIZ;
218: char *cp, *previfname = "", *ifconf_buf = NULL;
219: #ifdef _ISC
220: struct strioctl strioctl;
221: #endif /* _ISC */
222: debug_decl(get_net_ifs, SUDO_DEBUG_NETIF)
223:
224: sock = socket(AF_INET, SOCK_DGRAM, 0);
225: if (sock < 0)
226: fatal(_("unable to open socket"));
227:
228: /*
229: * Get interface configuration or return.
230: */
231: for (;;) {
232: ifconf_buf = emalloc(buflen);
233: ifconf = (struct ifconf *) ifconf_buf;
234: ifconf->ifc_len = buflen - sizeof(struct ifconf);
235: ifconf->ifc_buf = (caddr_t) (ifconf_buf + sizeof(struct ifconf));
236:
237: #ifdef _ISC
238: STRSET(SIOCGIFCONF, (caddr_t) ifconf, buflen);
239: if (ioctl(sock, I_STR, (caddr_t) &strioctl) < 0)
240: #else
241: /* Note that some kernels return EINVAL if the buffer is too small */
242: if (ioctl(sock, SIOCGIFCONF, (caddr_t) ifconf) < 0 && errno != EINVAL)
243: #endif /* _ISC */
244: goto done;
245:
246: /* Break out of loop if we have a big enough buffer. */
247: if (ifconf->ifc_len + sizeof(struct ifreq) < buflen)
248: break;
249: buflen += BUFSIZ;
250: efree(ifconf_buf);
251: }
252:
253: /* Allocate space for the maximum number of interfaces that could exist. */
254: if ((n = ifconf->ifc_len / sizeof(struct ifreq)) == 0)
255: debug_return_int(0);
256: ailen = n * 2 * INET6_ADDRSTRLEN;
257: *addrinfo = cp = emalloc(ailen);
258:
259: /* For each interface, store the ip address and netmask. */
260: for (i = 0; i < ifconf->ifc_len; ) {
261: /* Get a pointer to the current interface. */
262: ifr = (struct ifreq *) &ifconf->ifc_buf[i];
263:
264: /* Set i to the subscript of the next interface. */
265: i += sizeof(struct ifreq);
266: #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
267: if (ifr->ifr_addr.sa_len > sizeof(ifr->ifr_addr))
268: i += ifr->ifr_addr.sa_len - sizeof(struct sockaddr);
269: #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */
270:
271: /* Skip duplicates and interfaces with NULL addresses. */
272: sin = (struct sockaddr_in *) &ifr->ifr_addr;
273: if (sin->sin_addr.s_addr == 0 ||
274: strncmp(previfname, ifr->ifr_name, sizeof(ifr->ifr_name) - 1) == 0)
275: continue;
276:
277: if (ifr->ifr_addr.sa_family != AF_INET)
278: continue;
279:
280: #ifdef SIOCGIFFLAGS
281: memset(&ifr_tmp, 0, sizeof(ifr_tmp));
282: strncpy(ifr_tmp.ifr_name, ifr->ifr_name, sizeof(ifr_tmp.ifr_name) - 1);
283: if (ioctl(sock, SIOCGIFFLAGS, (caddr_t) &ifr_tmp) < 0)
284: #endif
285: ifr_tmp = *ifr;
286:
287: /* Skip interfaces marked "down" and "loopback". */
288: if (!ISSET(ifr_tmp.ifr_flags, IFF_UP) ||
289: ISSET(ifr_tmp.ifr_flags, IFF_LOOPBACK))
290: continue;
291:
292: sin = (struct sockaddr_in *) &ifr->ifr_addr;
293: len = snprintf(cp, ailen - (*addrinfo - cp),
294: "%s%s/", cp == *addrinfo ? "" : " ",
295: inet_ntoa(sin->sin_addr));
296: if (len <= 0 || len >= ailen - (*addrinfo - cp)) {
297: warningx(_("load_interfaces: overflow detected"));
298: goto done;
299: }
300: cp += len;
301:
302: /* Stash the name of the interface we saved. */
303: previfname = ifr->ifr_name;
304:
305: /* Get the netmask. */
306: memset(&ifr_tmp, 0, sizeof(ifr_tmp));
307: strncpy(ifr_tmp.ifr_name, ifr->ifr_name, sizeof(ifr_tmp.ifr_name) - 1);
308: #ifdef _ISC
309: STRSET(SIOCGIFNETMASK, (caddr_t) &ifr_tmp, sizeof(ifr_tmp));
310: if (ioctl(sock, I_STR, (caddr_t) &strioctl) < 0) {
311: #else
312: if (ioctl(sock, SIOCGIFNETMASK, (caddr_t) &ifr_tmp) < 0) {
313: #endif /* _ISC */
314: sin = (struct sockaddr_in *) &ifr_tmp.ifr_addr;
315: sin->sin_addr.s_addr = htonl(IN_CLASSC_NET);
316: }
317: sin = (struct sockaddr_in *) &ifr_tmp.ifr_addr;
318: len = snprintf(cp, ailen - (*addrinfo - cp),
319: "%s", inet_ntoa(sin->sin_addr));
320: if (len <= 0 || len >= ailen - (*addrinfo - cp)) {
321: warningx(_("load_interfaces: overflow detected"));
322: goto done;
323: }
324: cp += len;
325: num_interfaces++;
326: }
327:
328: done:
329: efree(ifconf_buf);
330: (void) close(sock);
331:
332: debug_return_int(num_interfaces);
333: }
334:
335: #else /* !SIOCGIFCONF || STUB_LOAD_INTERFACES */
336:
337: /*
338: * Stub function for those without SIOCGIFCONF or getifaddrs()
339: */
340: int
341: get_net_ifs(char **addrinfo)
342: {
343: debug_decl(get_net_ifs, SUDO_DEBUG_NETIF)
344: debug_return_int(0);
345: }
346:
347: #endif /* SIOCGIFCONF && !STUB_LOAD_INTERFACES */
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