Annotation of src/usr.bin/sudo/interfaces.c, Revision 1.13
1.1 millert 1: /*
1.13 ! millert 2: * Copyright (c) 1996, 1998-2005, 2007-2008
! 3: * Todd C. Miller <Todd.Miller@courtesan.com>
1.1 millert 4: *
1.7 millert 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.
1.6 millert 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.
1.1 millert 20: */
21:
22: /*
1.11 martynas 23: * Suppress a warning w/ gcc on Digital UN*X.
1.1 millert 24: * The system headers should really do this....
25: */
26: #if defined(__osf__) && !defined(__cplusplus)
27: struct mbuf;
28: struct rtentry;
29: #endif
30:
1.8 millert 31: #include <config.h>
1.1 millert 32:
1.2 millert 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
1.1 millert 41: #include <stdio.h>
42: #ifdef STDC_HEADERS
1.2 millert 43: # include <stdlib.h>
44: # include <stddef.h>
45: #else
46: # ifdef HAVE_STDLIB_H
47: # include <stdlib.h>
48: # endif
1.1 millert 49: #endif /* STDC_HEADERS */
1.2 millert 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: #else
56: # ifdef HAVE_STRINGS_H
57: # include <strings.h>
58: # endif
59: #endif /* HAVE_STRING_H */
1.1 millert 60: #ifdef HAVE_UNISTD_H
1.2 millert 61: # include <unistd.h>
1.1 millert 62: #endif /* HAVE_UNISTD_H */
63: #include <netdb.h>
1.8 millert 64: #include <errno.h>
1.1 millert 65: #ifdef _ISC
1.2 millert 66: # include <sys/stream.h>
67: # include <sys/sioctl.h>
68: # include <sys/stropts.h>
69: # define STRSET(cmd, param, len) {strioctl.ic_cmd=(cmd);\
1.1 millert 70: strioctl.ic_dp=(param);\
71: strioctl.ic_timout=0;\
72: strioctl.ic_len=(len);}
73: #endif /* _ISC */
74: #ifdef _MIPS
1.2 millert 75: # include <net/soioctl.h>
1.1 millert 76: #endif /* _MIPS */
77: #include <netinet/in.h>
78: #include <arpa/inet.h>
79: #include <net/if.h>
1.2 millert 80: #ifdef HAVE_GETIFADDRS
81: # include <ifaddrs.h>
82: #endif
1.1 millert 83:
84: #include "sudo.h"
85: #include "interfaces.h"
86:
87: #ifndef lint
1.13 ! millert 88: __unused static const char rcsid[] = "$Sudo: interfaces.c,v 1.84 2008/11/09 14:13:12 millert Exp $";
1.1 millert 89: #endif /* lint */
90:
91:
1.2 millert 92: #ifdef HAVE_GETIFADDRS
93:
94: /*
95: * Allocate and fill in the interfaces global variable with the
96: * machine's ip addresses and netmasks.
97: */
98: void
99: load_interfaces()
100: {
101: struct ifaddrs *ifa, *ifaddrs;
102: struct sockaddr_in *sin;
1.10 millert 103: #ifdef HAVE_IN6_ADDR
1.9 millert 104: struct sockaddr_in6 *sin6;
105: #endif
1.2 millert 106: int i;
107:
108: if (getifaddrs(&ifaddrs))
109: return;
110:
111: /* Allocate space for the interfaces list. */
1.4 millert 112: for (ifa = ifaddrs; ifa != NULL; ifa = ifa -> ifa_next) {
1.2 millert 113: /* Skip interfaces marked "down" and "loopback". */
1.7 millert 114: if (ifa->ifa_addr == NULL || !ISSET(ifa->ifa_flags, IFF_UP) ||
115: ISSET(ifa->ifa_flags, IFF_LOOPBACK))
1.2 millert 116: continue;
117:
118: switch(ifa->ifa_addr->sa_family) {
119: case AF_INET:
1.10 millert 120: #ifdef HAVE_IN6_ADDR
1.9 millert 121: case AF_INET6:
122: #endif
1.2 millert 123: num_interfaces++;
124: break;
125: }
126: }
1.4 millert 127: if (num_interfaces == 0)
128: return;
1.2 millert 129: interfaces =
1.4 millert 130: (struct interface *) emalloc2(num_interfaces, sizeof(struct interface));
1.2 millert 131:
132: /* Store the ip addr / netmask pairs. */
1.4 millert 133: for (ifa = ifaddrs, i = 0; ifa != NULL; ifa = ifa -> ifa_next) {
1.2 millert 134: /* Skip interfaces marked "down" and "loopback". */
1.7 millert 135: if (ifa->ifa_addr == NULL || !ISSET(ifa->ifa_flags, IFF_UP) ||
136: ISSET(ifa->ifa_flags, IFF_LOOPBACK))
1.2 millert 137: continue;
138:
139: switch(ifa->ifa_addr->sa_family) {
140: case AF_INET:
141: sin = (struct sockaddr_in *)ifa->ifa_addr;
142: memcpy(&interfaces[i].addr, &sin->sin_addr,
143: sizeof(struct in_addr));
144: sin = (struct sockaddr_in *)ifa->ifa_netmask;
145: memcpy(&interfaces[i].netmask, &sin->sin_addr,
146: sizeof(struct in_addr));
1.9 millert 147: interfaces[i].family = AF_INET;
1.2 millert 148: i++;
149: break;
1.10 millert 150: #ifdef HAVE_IN6_ADDR
1.9 millert 151: case AF_INET6:
152: sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
153: memcpy(&interfaces[i].addr, &sin6->sin6_addr,
154: sizeof(struct in6_addr));
155: sin6 = (struct sockaddr_in6 *)ifa->ifa_netmask;
156: memcpy(&interfaces[i].netmask, &sin6->sin6_addr,
157: sizeof(struct in6_addr));
158: interfaces[i].family = AF_INET6;
159: i++;
160: break;
1.10 millert 161: #endif /* HAVE_IN6_ADDR */
1.2 millert 162: }
163: }
1.3 millert 164: #ifdef HAVE_FREEIFADDRS
1.2 millert 165: freeifaddrs(ifaddrs);
1.3 millert 166: #else
1.8 millert 167: efree(ifaddrs);
1.3 millert 168: #endif
1.2 millert 169: }
170:
171: #elif defined(SIOCGIFCONF) && !defined(STUB_LOAD_INTERFACES)
172:
1.1 millert 173: /*
174: * Allocate and fill in the interfaces global variable with the
175: * machine's ip addresses and netmasks.
176: */
177: void
178: load_interfaces()
179: {
180: struct ifconf *ifconf;
181: struct ifreq *ifr, ifr_tmp;
182: struct sockaddr_in *sin;
183: int sock, n, i;
184: size_t len = sizeof(struct ifconf) + BUFSIZ;
185: char *previfname = "", *ifconf_buf = NULL;
186: #ifdef _ISC
187: struct strioctl strioctl;
188: #endif /* _ISC */
189:
190: sock = socket(AF_INET, SOCK_DGRAM, 0);
1.5 millert 191: if (sock < 0)
1.13 ! millert 192: error(1, "cannot open socket");
1.1 millert 193:
194: /*
1.4 millert 195: * Get interface configuration or return (leaving num_interfaces == 0)
1.1 millert 196: */
197: for (;;) {
198: ifconf_buf = erealloc(ifconf_buf, len);
199: ifconf = (struct ifconf *) ifconf_buf;
200: ifconf->ifc_len = len - sizeof(struct ifconf);
201: ifconf->ifc_buf = (caddr_t) (ifconf_buf + sizeof(struct ifconf));
202:
203: #ifdef _ISC
204: STRSET(SIOCGIFCONF, (caddr_t) ifconf, len);
205: if (ioctl(sock, I_STR, (caddr_t) &strioctl) < 0) {
206: #else
1.8 millert 207: /* Note that some kernels return EINVAL if the buffer is too small */
208: if (ioctl(sock, SIOCGIFCONF, (caddr_t) ifconf) < 0 && errno != EINVAL) {
1.1 millert 209: #endif /* _ISC */
1.8 millert 210: efree(ifconf_buf);
1.1 millert 211: (void) close(sock);
212: return;
213: }
214:
215: /* Break out of loop if we have a big enough buffer. */
216: if (ifconf->ifc_len + sizeof(struct ifreq) < len)
217: break;
218: len += BUFSIZ;
219: }
220:
221: /* Allocate space for the maximum number of interfaces that could exist. */
1.4 millert 222: if ((n = ifconf->ifc_len / sizeof(struct ifreq)) == 0)
223: return;
224: interfaces = (struct interface *) emalloc2(n, sizeof(struct interface));
1.1 millert 225:
226: /* For each interface, store the ip address and netmask. */
227: for (i = 0; i < ifconf->ifc_len; ) {
228: /* Get a pointer to the current interface. */
229: ifr = (struct ifreq *) &ifconf->ifc_buf[i];
230:
231: /* Set i to the subscript of the next interface. */
232: i += sizeof(struct ifreq);
233: #ifdef HAVE_SA_LEN
234: if (ifr->ifr_addr.sa_len > sizeof(ifr->ifr_addr))
235: i += ifr->ifr_addr.sa_len - sizeof(struct sockaddr);
236: #endif /* HAVE_SA_LEN */
237:
238: /* Skip duplicates and interfaces with NULL addresses. */
239: sin = (struct sockaddr_in *) &ifr->ifr_addr;
240: if (sin->sin_addr.s_addr == 0 ||
241: strncmp(previfname, ifr->ifr_name, sizeof(ifr->ifr_name) - 1) == 0)
242: continue;
243:
244: if (ifr->ifr_addr.sa_family != AF_INET)
245: continue;
246:
247: #ifdef SIOCGIFFLAGS
1.13 ! millert 248: zero_bytes(&ifr_tmp, sizeof(ifr_tmp));
1.1 millert 249: strncpy(ifr_tmp.ifr_name, ifr->ifr_name, sizeof(ifr_tmp.ifr_name) - 1);
250: if (ioctl(sock, SIOCGIFFLAGS, (caddr_t) &ifr_tmp) < 0)
251: #endif
252: ifr_tmp = *ifr;
253:
254: /* Skip interfaces marked "down" and "loopback". */
1.7 millert 255: if (!ISSET(ifr_tmp.ifr_flags, IFF_UP) ||
256: ISSET(ifr_tmp.ifr_flags, IFF_LOOPBACK))
1.1 millert 257: continue;
258:
259: sin = (struct sockaddr_in *) &ifr->ifr_addr;
1.9 millert 260: interfaces[num_interfaces].addr.ip4.s_addr = sin->sin_addr.s_addr;
1.1 millert 261:
262: /* Stash the name of the interface we saved. */
263: previfname = ifr->ifr_name;
264:
265: /* Get the netmask. */
1.13 ! millert 266: zero_bytes(&ifr_tmp, sizeof(ifr_tmp));
1.1 millert 267: strncpy(ifr_tmp.ifr_name, ifr->ifr_name, sizeof(ifr_tmp.ifr_name) - 1);
268: #ifdef SIOCGIFNETMASK
269: #ifdef _ISC
270: STRSET(SIOCGIFNETMASK, (caddr_t) &ifr_tmp, sizeof(ifr_tmp));
271: if (ioctl(sock, I_STR, (caddr_t) &strioctl) == 0) {
272: #else
273: if (ioctl(sock, SIOCGIFNETMASK, (caddr_t) &ifr_tmp) == 0) {
274: #endif /* _ISC */
275: sin = (struct sockaddr_in *) &ifr_tmp.ifr_addr;
276:
1.9 millert 277: interfaces[num_interfaces].netmask.ip4.s_addr = sin->sin_addr.s_addr;
1.1 millert 278: } else {
279: #else
280: {
281: #endif /* SIOCGIFNETMASK */
1.9 millert 282: if (IN_CLASSC(interfaces[num_interfaces].addr.ip4.s_addr))
283: interfaces[num_interfaces].netmask.ip4.s_addr = htonl(IN_CLASSC_NET);
284: else if (IN_CLASSB(interfaces[num_interfaces].addr.ip4.s_addr))
285: interfaces[num_interfaces].netmask.ip4.s_addr = htonl(IN_CLASSB_NET);
1.1 millert 286: else
1.9 millert 287: interfaces[num_interfaces].netmask.ip4.s_addr = htonl(IN_CLASSA_NET);
1.1 millert 288: }
289:
290: /* Only now can we be sure it was a good/interesting interface. */
1.9 millert 291: interfaces[num_interfaces].family = AF_INET;
1.1 millert 292: num_interfaces++;
293: }
294:
295: /* If the expected size < real size, realloc the array. */
296: if (n != num_interfaces) {
297: if (num_interfaces != 0)
1.4 millert 298: interfaces = (struct interface *) erealloc3(interfaces,
299: num_interfaces, sizeof(struct interface));
1.1 millert 300: else
1.8 millert 301: efree(interfaces);
1.1 millert 302: }
1.8 millert 303: efree(ifconf_buf);
1.1 millert 304: (void) close(sock);
305: }
306:
307: #else /* !SIOCGIFCONF || STUB_LOAD_INTERFACES */
308:
309: /*
310: * Stub function for those without SIOCGIFCONF
311: */
312: void
313: load_interfaces()
314: {
315: return;
316: }
317:
318: #endif /* SIOCGIFCONF && !STUB_LOAD_INTERFACES */
1.2 millert 319:
320: void
321: dump_interfaces()
322: {
323: int i;
1.10 millert 324: #ifdef HAVE_IN6_ADDR
1.9 millert 325: char addrbuf[INET6_ADDRSTRLEN], maskbuf[INET6_ADDRSTRLEN];
326: #endif
1.2 millert 327:
328: puts("Local IP address and netmask pairs:");
1.9 millert 329: for (i = 0; i < num_interfaces; i++) {
330: switch(interfaces[i].family) {
331: case AF_INET:
332: printf("\t%s / ", inet_ntoa(interfaces[i].addr.ip4));
333: puts(inet_ntoa(interfaces[i].netmask.ip4));
334: break;
1.10 millert 335: #ifdef HAVE_IN6_ADDR
1.9 millert 336: case AF_INET6:
337: inet_ntop(AF_INET6, &interfaces[i].addr.ip6,
338: addrbuf, sizeof(addrbuf));
339: inet_ntop(AF_INET6, &interfaces[i].netmask.ip6,
340: maskbuf, sizeof(maskbuf));
341: printf("\t%s / %s\n", addrbuf, maskbuf);
342: break;
1.10 millert 343: #endif /* HAVE_IN6_ADDR */
1.9 millert 344: }
345: }
1.2 millert 346: }
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