Annotation of src/usr.bin/sudo/interfaces.c, Revision 1.8
1.1 millert 1: /*
1.8 ! millert 2: * Copyright (c) 1996, 1998-2005 Todd C. Miller <Todd.Miller@courtesan.com>
1.1 millert 3: *
1.7 millert 4: * Permission to use, copy, modify, and distribute this software for any
5: * purpose with or without fee is hereby granted, provided that the above
6: * copyright notice and this permission notice appear in all copies.
7: *
8: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
1.6 millert 15: *
16: * Sponsored in part by the Defense Advanced Research Projects
17: * Agency (DARPA) and Air Force Research Laboratory, Air Force
18: * Materiel Command, USAF, under agreement number F39502-99-1-0512.
1.1 millert 19: */
20:
21: /*
22: * Supress a warning w/ gcc on Digital UN*X.
23: * The system headers should really do this....
24: */
25: #if defined(__osf__) && !defined(__cplusplus)
26: struct mbuf;
27: struct rtentry;
28: #endif
29:
1.8 ! millert 30: #include <config.h>
1.1 millert 31:
1.2 millert 32: #include <sys/types.h>
33: #include <sys/socket.h>
34: #include <sys/param.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
1.1 millert 40: #include <stdio.h>
41: #ifdef STDC_HEADERS
1.2 millert 42: # include <stdlib.h>
43: # include <stddef.h>
44: #else
45: # ifdef HAVE_STDLIB_H
46: # include <stdlib.h>
47: # endif
1.1 millert 48: #endif /* STDC_HEADERS */
1.2 millert 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: #else
55: # ifdef HAVE_STRINGS_H
56: # include <strings.h>
57: # endif
58: #endif /* HAVE_STRING_H */
1.1 millert 59: #ifdef HAVE_UNISTD_H
1.2 millert 60: # include <unistd.h>
1.1 millert 61: #endif /* HAVE_UNISTD_H */
1.5 millert 62: #ifdef HAVE_ERR_H
63: # include <err.h>
64: #else
65: # include "emul/err.h"
66: #endif /* HAVE_ERR_H */
1.1 millert 67: #include <netdb.h>
1.8 ! millert 68: #include <errno.h>
1.1 millert 69: #ifdef _ISC
1.2 millert 70: # include <sys/stream.h>
71: # include <sys/sioctl.h>
72: # include <sys/stropts.h>
73: # define STRSET(cmd, param, len) {strioctl.ic_cmd=(cmd);\
1.1 millert 74: strioctl.ic_dp=(param);\
75: strioctl.ic_timout=0;\
76: strioctl.ic_len=(len);}
77: #endif /* _ISC */
78: #ifdef _MIPS
1.2 millert 79: # include <net/soioctl.h>
1.1 millert 80: #endif /* _MIPS */
81: #include <netinet/in.h>
82: #include <arpa/inet.h>
83: #include <net/if.h>
1.2 millert 84: #ifdef HAVE_GETIFADDRS
85: # include <ifaddrs.h>
86: #endif
1.1 millert 87:
88: #include "sudo.h"
89: #include "interfaces.h"
90:
91: #ifndef lint
1.8 ! millert 92: __unused static const char rcsid[] = "$Sudo: interfaces.c,v 1.72.2.4 2007/06/14 16:24:09 millert Exp $";
1.1 millert 93: #endif /* lint */
94:
95:
1.2 millert 96: #ifdef HAVE_GETIFADDRS
97:
98: /*
99: * Allocate and fill in the interfaces global variable with the
100: * machine's ip addresses and netmasks.
101: */
102: void
103: load_interfaces()
104: {
105: struct ifaddrs *ifa, *ifaddrs;
106: /* XXX - sockaddr_in6 sin6; */
107: struct sockaddr_in *sin;
108: int i;
109:
110: if (getifaddrs(&ifaddrs))
111: return;
112:
113: /* Allocate space for the interfaces list. */
1.4 millert 114: for (ifa = ifaddrs; ifa != NULL; ifa = ifa -> ifa_next) {
1.2 millert 115: /* Skip interfaces marked "down" and "loopback". */
1.7 millert 116: if (ifa->ifa_addr == NULL || !ISSET(ifa->ifa_flags, IFF_UP) ||
117: ISSET(ifa->ifa_flags, IFF_LOOPBACK))
1.2 millert 118: continue;
119:
120: switch(ifa->ifa_addr->sa_family) {
121: /* XXX - AF_INET6 */
122: case AF_INET:
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: /* XXX - AF_INET6 */
141: case AF_INET:
142: sin = (struct sockaddr_in *)ifa->ifa_addr;
143: memcpy(&interfaces[i].addr, &sin->sin_addr,
144: sizeof(struct in_addr));
145: sin = (struct sockaddr_in *)ifa->ifa_netmask;
146: memcpy(&interfaces[i].netmask, &sin->sin_addr,
147: sizeof(struct in_addr));
148: i++;
149: break;
150: }
151: }
1.3 millert 152: #ifdef HAVE_FREEIFADDRS
1.2 millert 153: freeifaddrs(ifaddrs);
1.3 millert 154: #else
1.8 ! millert 155: efree(ifaddrs);
1.3 millert 156: #endif
1.2 millert 157: }
158:
159: #elif defined(SIOCGIFCONF) && !defined(STUB_LOAD_INTERFACES)
160:
1.1 millert 161: /*
162: * Allocate and fill in the interfaces global variable with the
163: * machine's ip addresses and netmasks.
164: */
165: void
166: load_interfaces()
167: {
168: struct ifconf *ifconf;
169: struct ifreq *ifr, ifr_tmp;
170: struct sockaddr_in *sin;
171: int sock, n, i;
172: size_t len = sizeof(struct ifconf) + BUFSIZ;
173: char *previfname = "", *ifconf_buf = NULL;
174: #ifdef _ISC
175: struct strioctl strioctl;
176: #endif /* _ISC */
177:
178: sock = socket(AF_INET, SOCK_DGRAM, 0);
1.5 millert 179: if (sock < 0)
180: err(1, "cannot open socket");
1.1 millert 181:
182: /*
1.4 millert 183: * Get interface configuration or return (leaving num_interfaces == 0)
1.1 millert 184: */
185: for (;;) {
186: ifconf_buf = erealloc(ifconf_buf, len);
187: ifconf = (struct ifconf *) ifconf_buf;
188: ifconf->ifc_len = len - sizeof(struct ifconf);
189: ifconf->ifc_buf = (caddr_t) (ifconf_buf + sizeof(struct ifconf));
190:
191: #ifdef _ISC
192: STRSET(SIOCGIFCONF, (caddr_t) ifconf, len);
193: if (ioctl(sock, I_STR, (caddr_t) &strioctl) < 0) {
194: #else
1.8 ! millert 195: /* Note that some kernels return EINVAL if the buffer is too small */
! 196: if (ioctl(sock, SIOCGIFCONF, (caddr_t) ifconf) < 0 && errno != EINVAL) {
1.1 millert 197: #endif /* _ISC */
1.8 ! millert 198: efree(ifconf_buf);
1.1 millert 199: (void) close(sock);
200: return;
201: }
202:
203: /* Break out of loop if we have a big enough buffer. */
204: if (ifconf->ifc_len + sizeof(struct ifreq) < len)
205: break;
206: len += BUFSIZ;
207: }
208:
209: /* Allocate space for the maximum number of interfaces that could exist. */
1.4 millert 210: if ((n = ifconf->ifc_len / sizeof(struct ifreq)) == 0)
211: return;
212: interfaces = (struct interface *) emalloc2(n, sizeof(struct interface));
1.1 millert 213:
214: /* For each interface, store the ip address and netmask. */
215: for (i = 0; i < ifconf->ifc_len; ) {
216: /* Get a pointer to the current interface. */
217: ifr = (struct ifreq *) &ifconf->ifc_buf[i];
218:
219: /* Set i to the subscript of the next interface. */
220: i += sizeof(struct ifreq);
221: #ifdef HAVE_SA_LEN
222: if (ifr->ifr_addr.sa_len > sizeof(ifr->ifr_addr))
223: i += ifr->ifr_addr.sa_len - sizeof(struct sockaddr);
224: #endif /* HAVE_SA_LEN */
225:
226: /* Skip duplicates and interfaces with NULL addresses. */
227: sin = (struct sockaddr_in *) &ifr->ifr_addr;
228: if (sin->sin_addr.s_addr == 0 ||
229: strncmp(previfname, ifr->ifr_name, sizeof(ifr->ifr_name) - 1) == 0)
230: continue;
231:
232: if (ifr->ifr_addr.sa_family != AF_INET)
233: continue;
234:
235: #ifdef SIOCGIFFLAGS
236: memset(&ifr_tmp, 0, sizeof(ifr_tmp));
237: strncpy(ifr_tmp.ifr_name, ifr->ifr_name, sizeof(ifr_tmp.ifr_name) - 1);
238: if (ioctl(sock, SIOCGIFFLAGS, (caddr_t) &ifr_tmp) < 0)
239: #endif
240: ifr_tmp = *ifr;
241:
242: /* Skip interfaces marked "down" and "loopback". */
1.7 millert 243: if (!ISSET(ifr_tmp.ifr_flags, IFF_UP) ||
244: ISSET(ifr_tmp.ifr_flags, IFF_LOOPBACK))
1.1 millert 245: continue;
246:
247: sin = (struct sockaddr_in *) &ifr->ifr_addr;
248: interfaces[num_interfaces].addr.s_addr = sin->sin_addr.s_addr;
249:
250: /* Stash the name of the interface we saved. */
251: previfname = ifr->ifr_name;
252:
253: /* Get the netmask. */
254: (void) memset(&ifr_tmp, 0, sizeof(ifr_tmp));
255: strncpy(ifr_tmp.ifr_name, ifr->ifr_name, sizeof(ifr_tmp.ifr_name) - 1);
256: #ifdef SIOCGIFNETMASK
257: #ifdef _ISC
258: STRSET(SIOCGIFNETMASK, (caddr_t) &ifr_tmp, sizeof(ifr_tmp));
259: if (ioctl(sock, I_STR, (caddr_t) &strioctl) == 0) {
260: #else
261: if (ioctl(sock, SIOCGIFNETMASK, (caddr_t) &ifr_tmp) == 0) {
262: #endif /* _ISC */
263: sin = (struct sockaddr_in *) &ifr_tmp.ifr_addr;
264:
265: interfaces[num_interfaces].netmask.s_addr = sin->sin_addr.s_addr;
266: } else {
267: #else
268: {
269: #endif /* SIOCGIFNETMASK */
270: if (IN_CLASSC(interfaces[num_interfaces].addr.s_addr))
271: interfaces[num_interfaces].netmask.s_addr = htonl(IN_CLASSC_NET);
272: else if (IN_CLASSB(interfaces[num_interfaces].addr.s_addr))
273: interfaces[num_interfaces].netmask.s_addr = htonl(IN_CLASSB_NET);
274: else
275: interfaces[num_interfaces].netmask.s_addr = htonl(IN_CLASSA_NET);
276: }
277:
278: /* Only now can we be sure it was a good/interesting interface. */
279: num_interfaces++;
280: }
281:
282: /* If the expected size < real size, realloc the array. */
283: if (n != num_interfaces) {
284: if (num_interfaces != 0)
1.4 millert 285: interfaces = (struct interface *) erealloc3(interfaces,
286: num_interfaces, sizeof(struct interface));
1.1 millert 287: else
1.8 ! millert 288: efree(interfaces);
1.1 millert 289: }
1.8 ! millert 290: efree(ifconf_buf);
1.1 millert 291: (void) close(sock);
292: }
293:
294: #else /* !SIOCGIFCONF || STUB_LOAD_INTERFACES */
295:
296: /*
297: * Stub function for those without SIOCGIFCONF
298: */
299: void
300: load_interfaces()
301: {
302: return;
303: }
304:
305: #endif /* SIOCGIFCONF && !STUB_LOAD_INTERFACES */
1.2 millert 306:
307: void
308: dump_interfaces()
309: {
310: int i;
311:
312: puts("Local IP address and netmask pairs:");
313: for (i = 0; i < num_interfaces; i++)
314: printf("\t%s / 0x%x\n", inet_ntoa(interfaces[i].addr),
1.5 millert 315: (unsigned int)ntohl(interfaces[i].netmask.s_addr));
1.2 millert 316: }
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