Annotation of src/usr.bin/sudo/interfaces.c, Revision 1.15
1.1 millert 1: /*
1.14 millert 2: * Copyright (c) 1996, 1998-2005, 2007-2009
1.13 millert 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:
1.14 millert 87: /* Minix apparently lacks IFF_LOOPBACK */
88: #ifndef IFF_LOOPBACK
89: # define IFF_LOOPBACK 0
90: #endif
1.1 millert 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;
1.14 millert 142: if (sin == NULL)
143: continue;
1.2 millert 144: memcpy(&interfaces[i].addr, &sin->sin_addr,
145: sizeof(struct in_addr));
146: sin = (struct sockaddr_in *)ifa->ifa_netmask;
1.14 millert 147: if (sin == NULL)
148: continue;
1.2 millert 149: memcpy(&interfaces[i].netmask, &sin->sin_addr,
150: sizeof(struct in_addr));
1.9 millert 151: interfaces[i].family = AF_INET;
1.2 millert 152: i++;
153: break;
1.10 millert 154: #ifdef HAVE_IN6_ADDR
1.9 millert 155: case AF_INET6:
156: sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
1.14 millert 157: if (sin6 == NULL)
158: continue;
1.9 millert 159: memcpy(&interfaces[i].addr, &sin6->sin6_addr,
160: sizeof(struct in6_addr));
161: sin6 = (struct sockaddr_in6 *)ifa->ifa_netmask;
1.14 millert 162: if (sin6 == NULL)
163: continue;
1.9 millert 164: memcpy(&interfaces[i].netmask, &sin6->sin6_addr,
165: sizeof(struct in6_addr));
166: interfaces[i].family = AF_INET6;
167: i++;
168: break;
1.10 millert 169: #endif /* HAVE_IN6_ADDR */
1.2 millert 170: }
171: }
1.3 millert 172: #ifdef HAVE_FREEIFADDRS
1.2 millert 173: freeifaddrs(ifaddrs);
1.3 millert 174: #else
1.8 millert 175: efree(ifaddrs);
1.3 millert 176: #endif
1.2 millert 177: }
178:
179: #elif defined(SIOCGIFCONF) && !defined(STUB_LOAD_INTERFACES)
180:
1.1 millert 181: /*
182: * Allocate and fill in the interfaces global variable with the
183: * machine's ip addresses and netmasks.
184: */
185: void
186: load_interfaces()
187: {
188: struct ifconf *ifconf;
189: struct ifreq *ifr, ifr_tmp;
190: struct sockaddr_in *sin;
191: int sock, n, i;
192: size_t len = sizeof(struct ifconf) + BUFSIZ;
193: char *previfname = "", *ifconf_buf = NULL;
194: #ifdef _ISC
195: struct strioctl strioctl;
196: #endif /* _ISC */
197:
198: sock = socket(AF_INET, SOCK_DGRAM, 0);
1.5 millert 199: if (sock < 0)
1.13 millert 200: error(1, "cannot open socket");
1.1 millert 201:
202: /*
1.4 millert 203: * Get interface configuration or return (leaving num_interfaces == 0)
1.1 millert 204: */
205: for (;;) {
206: ifconf_buf = erealloc(ifconf_buf, len);
207: ifconf = (struct ifconf *) ifconf_buf;
208: ifconf->ifc_len = len - sizeof(struct ifconf);
209: ifconf->ifc_buf = (caddr_t) (ifconf_buf + sizeof(struct ifconf));
210:
211: #ifdef _ISC
212: STRSET(SIOCGIFCONF, (caddr_t) ifconf, len);
213: if (ioctl(sock, I_STR, (caddr_t) &strioctl) < 0) {
214: #else
1.8 millert 215: /* Note that some kernels return EINVAL if the buffer is too small */
216: if (ioctl(sock, SIOCGIFCONF, (caddr_t) ifconf) < 0 && errno != EINVAL) {
1.1 millert 217: #endif /* _ISC */
1.8 millert 218: efree(ifconf_buf);
1.1 millert 219: (void) close(sock);
220: return;
221: }
222:
223: /* Break out of loop if we have a big enough buffer. */
224: if (ifconf->ifc_len + sizeof(struct ifreq) < len)
225: break;
226: len += BUFSIZ;
227: }
228:
229: /* Allocate space for the maximum number of interfaces that could exist. */
1.4 millert 230: if ((n = ifconf->ifc_len / sizeof(struct ifreq)) == 0)
231: return;
232: interfaces = (struct interface *) emalloc2(n, sizeof(struct interface));
1.1 millert 233:
234: /* For each interface, store the ip address and netmask. */
235: for (i = 0; i < ifconf->ifc_len; ) {
236: /* Get a pointer to the current interface. */
237: ifr = (struct ifreq *) &ifconf->ifc_buf[i];
238:
239: /* Set i to the subscript of the next interface. */
240: i += sizeof(struct ifreq);
241: #ifdef HAVE_SA_LEN
242: if (ifr->ifr_addr.sa_len > sizeof(ifr->ifr_addr))
243: i += ifr->ifr_addr.sa_len - sizeof(struct sockaddr);
244: #endif /* HAVE_SA_LEN */
245:
246: /* Skip duplicates and interfaces with NULL addresses. */
247: sin = (struct sockaddr_in *) &ifr->ifr_addr;
248: if (sin->sin_addr.s_addr == 0 ||
249: strncmp(previfname, ifr->ifr_name, sizeof(ifr->ifr_name) - 1) == 0)
250: continue;
251:
252: if (ifr->ifr_addr.sa_family != AF_INET)
253: continue;
254:
255: #ifdef SIOCGIFFLAGS
1.13 millert 256: zero_bytes(&ifr_tmp, sizeof(ifr_tmp));
1.1 millert 257: strncpy(ifr_tmp.ifr_name, ifr->ifr_name, sizeof(ifr_tmp.ifr_name) - 1);
258: if (ioctl(sock, SIOCGIFFLAGS, (caddr_t) &ifr_tmp) < 0)
259: #endif
260: ifr_tmp = *ifr;
261:
262: /* Skip interfaces marked "down" and "loopback". */
1.7 millert 263: if (!ISSET(ifr_tmp.ifr_flags, IFF_UP) ||
264: ISSET(ifr_tmp.ifr_flags, IFF_LOOPBACK))
1.1 millert 265: continue;
266:
267: sin = (struct sockaddr_in *) &ifr->ifr_addr;
1.9 millert 268: interfaces[num_interfaces].addr.ip4.s_addr = sin->sin_addr.s_addr;
1.1 millert 269:
270: /* Stash the name of the interface we saved. */
271: previfname = ifr->ifr_name;
272:
273: /* Get the netmask. */
1.13 millert 274: zero_bytes(&ifr_tmp, sizeof(ifr_tmp));
1.1 millert 275: strncpy(ifr_tmp.ifr_name, ifr->ifr_name, sizeof(ifr_tmp.ifr_name) - 1);
276: #ifdef SIOCGIFNETMASK
277: #ifdef _ISC
278: STRSET(SIOCGIFNETMASK, (caddr_t) &ifr_tmp, sizeof(ifr_tmp));
279: if (ioctl(sock, I_STR, (caddr_t) &strioctl) == 0) {
280: #else
281: if (ioctl(sock, SIOCGIFNETMASK, (caddr_t) &ifr_tmp) == 0) {
282: #endif /* _ISC */
283: sin = (struct sockaddr_in *) &ifr_tmp.ifr_addr;
284:
1.9 millert 285: interfaces[num_interfaces].netmask.ip4.s_addr = sin->sin_addr.s_addr;
1.1 millert 286: } else {
287: #else
288: {
289: #endif /* SIOCGIFNETMASK */
1.9 millert 290: if (IN_CLASSC(interfaces[num_interfaces].addr.ip4.s_addr))
291: interfaces[num_interfaces].netmask.ip4.s_addr = htonl(IN_CLASSC_NET);
292: else if (IN_CLASSB(interfaces[num_interfaces].addr.ip4.s_addr))
293: interfaces[num_interfaces].netmask.ip4.s_addr = htonl(IN_CLASSB_NET);
1.1 millert 294: else
1.9 millert 295: interfaces[num_interfaces].netmask.ip4.s_addr = htonl(IN_CLASSA_NET);
1.1 millert 296: }
297:
298: /* Only now can we be sure it was a good/interesting interface. */
1.9 millert 299: interfaces[num_interfaces].family = AF_INET;
1.1 millert 300: num_interfaces++;
301: }
302:
303: /* If the expected size < real size, realloc the array. */
304: if (n != num_interfaces) {
305: if (num_interfaces != 0)
1.4 millert 306: interfaces = (struct interface *) erealloc3(interfaces,
307: num_interfaces, sizeof(struct interface));
1.1 millert 308: else
1.8 millert 309: efree(interfaces);
1.1 millert 310: }
1.8 millert 311: efree(ifconf_buf);
1.1 millert 312: (void) close(sock);
313: }
314:
315: #else /* !SIOCGIFCONF || STUB_LOAD_INTERFACES */
316:
317: /*
318: * Stub function for those without SIOCGIFCONF
319: */
320: void
321: load_interfaces()
322: {
323: return;
324: }
325:
326: #endif /* SIOCGIFCONF && !STUB_LOAD_INTERFACES */
1.2 millert 327:
328: void
329: dump_interfaces()
330: {
331: int i;
1.10 millert 332: #ifdef HAVE_IN6_ADDR
1.9 millert 333: char addrbuf[INET6_ADDRSTRLEN], maskbuf[INET6_ADDRSTRLEN];
334: #endif
1.2 millert 335:
336: puts("Local IP address and netmask pairs:");
1.9 millert 337: for (i = 0; i < num_interfaces; i++) {
338: switch(interfaces[i].family) {
339: case AF_INET:
340: printf("\t%s / ", inet_ntoa(interfaces[i].addr.ip4));
341: puts(inet_ntoa(interfaces[i].netmask.ip4));
342: break;
1.10 millert 343: #ifdef HAVE_IN6_ADDR
1.9 millert 344: case AF_INET6:
345: inet_ntop(AF_INET6, &interfaces[i].addr.ip6,
346: addrbuf, sizeof(addrbuf));
347: inet_ntop(AF_INET6, &interfaces[i].netmask.ip6,
348: maskbuf, sizeof(maskbuf));
349: printf("\t%s / %s\n", addrbuf, maskbuf);
350: break;
1.10 millert 351: #endif /* HAVE_IN6_ADDR */
1.9 millert 352: }
353: }
1.2 millert 354: }
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