1 /* -*- Mode: c; tab-width: 8; indent-tabs-mode: 1; c-basic-offset: 8; -*- */ 2 /* 3 * Copyright (c) 1994, 1995, 1996, 1997, 1998 4 * The Regents of the University of California. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by the Computer Systems 17 * Engineering Group at Lawrence Berkeley Laboratory. 18 * 4. Neither the name of the University nor of the Laboratory may be used 19 * to endorse or promote products derived from this software without 20 * specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #ifdef HAVE_CONFIG_H 36 #include "config.h" 37 #endif 38 39 #include <sys/param.h> 40 #include <sys/file.h> 41 #include <sys/ioctl.h> 42 #include <sys/socket.h> 43 #ifdef HAVE_SYS_SOCKIO_H 44 #include <sys/sockio.h> 45 #endif 46 #include <sys/time.h> /* concession to AIX */ 47 48 struct mbuf; /* Squelch compiler warnings on some platforms for */ 49 struct rtentry; /* declarations in <net/if.h> */ 50 #include <net/if.h> 51 #include <netinet/in.h> 52 53 #include <ctype.h> 54 #include <errno.h> 55 #include <memory.h> 56 #include <stdio.h> 57 #include <stdlib.h> 58 #include <string.h> 59 #include <unistd.h> 60 61 #include "pcap-int.h" 62 63 #ifdef HAVE_OS_PROTO_H 64 #include "os-proto.h" 65 #endif 66 67 /* 68 * Get a list of all interfaces that are up and that we can open. 69 * Returns -1 on error, 0 otherwise. 70 * The list, as returned through "alldevsp", may be null if no interfaces 71 * were up and could be opened. 72 * 73 * This is the implementation used on platforms that have SIOCGLIFCONF 74 * but don't have "getifaddrs()". (Solaris 8 and later; we use 75 * SIOCGLIFCONF rather than SIOCGIFCONF in order to get IPv6 addresses.) 76 */ 77 int 78 pcap_findalldevs_interfaces(pcap_if_t **alldevsp, char *errbuf, 79 int (*check_usable)(const char *)) 80 { 81 pcap_if_t *devlist = NULL; 82 register int fd4, fd6, fd; 83 register struct lifreq *ifrp, *ifend; 84 struct lifnum ifn; 85 struct lifconf ifc; 86 char *buf = NULL; 87 unsigned buf_size; 88 #ifdef HAVE_SOLARIS 89 char *p, *q; 90 #endif 91 struct lifreq ifrflags, ifrnetmask, ifrbroadaddr, ifrdstaddr; 92 struct sockaddr *netmask, *broadaddr, *dstaddr; 93 int ret = 0; 94 95 /* 96 * Create a socket from which to fetch the list of interfaces, 97 * and from which to fetch IPv4 information. 98 */ 99 fd4 = socket(AF_INET, SOCK_DGRAM, 0); 100 if (fd4 < 0) { 101 (void)pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, 102 "socket: %s", pcap_strerror(errno)); 103 return (-1); 104 } 105 106 /* 107 * Create a socket from which to fetch IPv6 information. 108 */ 109 fd6 = socket(AF_INET6, SOCK_DGRAM, 0); 110 if (fd6 < 0) { 111 (void)pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, 112 "socket: %s", pcap_strerror(errno)); 113 (void)close(fd4); 114 return (-1); 115 } 116 117 /* 118 * How many entries will SIOCGLIFCONF return? 119 */ 120 ifn.lifn_family = AF_UNSPEC; 121 ifn.lifn_flags = 0; 122 ifn.lifn_count = 0; 123 if (ioctl(fd4, SIOCGLIFNUM, (char *)&ifn) < 0) { 124 (void)pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, 125 "SIOCGLIFNUM: %s", pcap_strerror(errno)); 126 (void)close(fd6); 127 (void)close(fd4); 128 return (-1); 129 } 130 131 /* 132 * Allocate a buffer for those entries. 133 */ 134 buf_size = ifn.lifn_count * sizeof (struct lifreq); 135 buf = malloc(buf_size); 136 if (buf == NULL) { 137 (void)pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, 138 "malloc: %s", pcap_strerror(errno)); 139 (void)close(fd6); 140 (void)close(fd4); 141 return (-1); 142 } 143 144 /* 145 * Get the entries. 146 */ 147 ifc.lifc_len = buf_size; 148 ifc.lifc_buf = buf; 149 ifc.lifc_family = AF_UNSPEC; 150 ifc.lifc_flags = 0; 151 memset(buf, 0, buf_size); 152 if (ioctl(fd4, SIOCGLIFCONF, (char *)&ifc) < 0) { 153 (void)pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, 154 "SIOCGLIFCONF: %s", pcap_strerror(errno)); 155 (void)close(fd6); 156 (void)close(fd4); 157 free(buf); 158 return (-1); 159 } 160 161 /* 162 * Loop over the entries. 163 */ 164 ifrp = (struct lifreq *)buf; 165 ifend = (struct lifreq *)(buf + ifc.lifc_len); 166 167 for (; ifrp < ifend; ifrp++) { 168 /* 169 * Skip entries that begin with "dummy". 170 * XXX - what are these? Is this Linux-specific? 171 * Are there platforms on which we shouldn't do this? 172 */ 173 if (strncmp(ifrp->lifr_name, "dummy", 5) == 0) 174 continue; 175 176 /* 177 * Can we capture on this device? 178 */ 179 if (!(*check_usable)(ifrp->lifr_name)) { 180 /* 181 * No. 182 */ 183 continue; 184 } 185 186 /* 187 * IPv6 or not? 188 */ 189 if (((struct sockaddr *)&ifrp->lifr_addr)->sa_family == AF_INET6) 190 fd = fd6; 191 else 192 fd = fd4; 193 194 /* 195 * Get the flags for this interface. 196 */ 197 strncpy(ifrflags.lifr_name, ifrp->lifr_name, 198 sizeof(ifrflags.lifr_name)); 199 if (ioctl(fd, SIOCGLIFFLAGS, (char *)&ifrflags) < 0) { 200 if (errno == ENXIO) 201 continue; 202 (void)pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, 203 "SIOCGLIFFLAGS: %.*s: %s", 204 (int)sizeof(ifrflags.lifr_name), 205 ifrflags.lifr_name, 206 pcap_strerror(errno)); 207 ret = -1; 208 break; 209 } 210 211 /* 212 * Get the netmask for this address on this interface. 213 */ 214 strncpy(ifrnetmask.lifr_name, ifrp->lifr_name, 215 sizeof(ifrnetmask.lifr_name)); 216 memcpy(&ifrnetmask.lifr_addr, &ifrp->lifr_addr, 217 sizeof(ifrnetmask.lifr_addr)); 218 if (ioctl(fd, SIOCGLIFNETMASK, (char *)&ifrnetmask) < 0) { 219 if (errno == EADDRNOTAVAIL) { 220 /* 221 * Not available. 222 */ 223 netmask = NULL; 224 } else { 225 (void)pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, 226 "SIOCGLIFNETMASK: %.*s: %s", 227 (int)sizeof(ifrnetmask.lifr_name), 228 ifrnetmask.lifr_name, 229 pcap_strerror(errno)); 230 ret = -1; 231 break; 232 } 233 } else 234 netmask = (struct sockaddr *)&ifrnetmask.lifr_addr; 235 236 /* 237 * Get the broadcast address for this address on this 238 * interface (if any). 239 */ 240 if (ifrflags.lifr_flags & IFF_BROADCAST) { 241 strncpy(ifrbroadaddr.lifr_name, ifrp->lifr_name, 242 sizeof(ifrbroadaddr.lifr_name)); 243 memcpy(&ifrbroadaddr.lifr_addr, &ifrp->lifr_addr, 244 sizeof(ifrbroadaddr.lifr_addr)); 245 if (ioctl(fd, SIOCGLIFBRDADDR, 246 (char *)&ifrbroadaddr) < 0) { 247 if (errno == EADDRNOTAVAIL) { 248 /* 249 * Not available. 250 */ 251 broadaddr = NULL; 252 } else { 253 (void)pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, 254 "SIOCGLIFBRDADDR: %.*s: %s", 255 (int)sizeof(ifrbroadaddr.lifr_name), 256 ifrbroadaddr.lifr_name, 257 pcap_strerror(errno)); 258 ret = -1; 259 break; 260 } 261 } else 262 broadaddr = (struct sockaddr *)&ifrbroadaddr.lifr_broadaddr; 263 } else { 264 /* 265 * Not a broadcast interface, so no broadcast 266 * address. 267 */ 268 broadaddr = NULL; 269 } 270 271 /* 272 * Get the destination address for this address on this 273 * interface (if any). 274 */ 275 if (ifrflags.lifr_flags & IFF_POINTOPOINT) { 276 strncpy(ifrdstaddr.lifr_name, ifrp->lifr_name, 277 sizeof(ifrdstaddr.lifr_name)); 278 memcpy(&ifrdstaddr.lifr_addr, &ifrp->lifr_addr, 279 sizeof(ifrdstaddr.lifr_addr)); 280 if (ioctl(fd, SIOCGLIFDSTADDR, 281 (char *)&ifrdstaddr) < 0) { 282 if (errno == EADDRNOTAVAIL) { 283 /* 284 * Not available. 285 */ 286 dstaddr = NULL; 287 } else { 288 (void)pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, 289 "SIOCGLIFDSTADDR: %.*s: %s", 290 (int)sizeof(ifrdstaddr.lifr_name), 291 ifrdstaddr.lifr_name, 292 pcap_strerror(errno)); 293 ret = -1; 294 break; 295 } 296 } else 297 dstaddr = (struct sockaddr *)&ifrdstaddr.lifr_dstaddr; 298 } else 299 dstaddr = NULL; 300 301 #ifdef HAVE_SOLARIS 302 /* 303 * If this entry has a colon followed by a number at 304 * the end, it's a logical interface. Those are just 305 * the way you assign multiple IP addresses to a real 306 * interface, so an entry for a logical interface should 307 * be treated like the entry for the real interface; 308 * we do that by stripping off the ":" and the number. 309 */ 310 p = strchr(ifrp->lifr_name, ':'); 311 if (p != NULL) { 312 /* 313 * We have a ":"; is it followed by a number? 314 */ 315 q = p + 1; 316 while (isdigit((unsigned char)*q)) 317 q++; 318 if (*q == '\0') { 319 /* 320 * All digits after the ":" until the end. 321 * Strip off the ":" and everything after 322 * it. 323 */ 324 *p = '\0'; 325 } 326 } 327 #endif 328 329 /* 330 * Add information for this address to the list. 331 */ 332 if (add_addr_to_iflist(&devlist, ifrp->lifr_name, 333 if_flags_to_pcap_flags(ifrp->lifr_name, ifrflags.lifr_flags), 334 (struct sockaddr *)&ifrp->lifr_addr, 335 sizeof (struct sockaddr_storage), 336 netmask, sizeof (struct sockaddr_storage), 337 broadaddr, sizeof (struct sockaddr_storage), 338 dstaddr, sizeof (struct sockaddr_storage), errbuf) < 0) { 339 ret = -1; 340 break; 341 } 342 } 343 free(buf); 344 (void)close(fd6); 345 (void)close(fd4); 346 347 if (ret == -1) { 348 /* 349 * We had an error; free the list we've been constructing. 350 */ 351 if (devlist != NULL) { 352 pcap_freealldevs(devlist); 353 devlist = NULL; 354 } 355 } 356 357 *alldevsp = devlist; 358 return (ret); 359 } 360