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 { 80 pcap_if_t *devlist = NULL; 81 register int fd4, fd6, fd; 82 register struct lifreq *ifrp, *ifend; 83 struct lifnum ifn; 84 struct lifconf ifc; 85 char *buf = NULL; 86 unsigned buf_size; 87 #ifdef HAVE_SOLARIS 88 char *p, *q; 89 #endif 90 struct lifreq ifrflags, ifrnetmask, ifrbroadaddr, ifrdstaddr; 91 struct sockaddr *netmask, *broadaddr, *dstaddr; 92 int ret = 0; 93 94 /* 95 * Create a socket from which to fetch the list of interfaces, 96 * and from which to fetch IPv4 information. 97 */ 98 fd4 = socket(AF_INET, SOCK_DGRAM, 0); 99 if (fd4 < 0) { 100 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, 101 "socket: %s", pcap_strerror(errno)); 102 return (-1); 103 } 104 105 /* 106 * Create a socket from which to fetch IPv6 information. 107 */ 108 fd6 = socket(AF_INET6, SOCK_DGRAM, 0); 109 if (fd6 < 0) { 110 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, 111 "socket: %s", pcap_strerror(errno)); 112 (void)close(fd4); 113 return (-1); 114 } 115 116 /* 117 * How many entries will SIOCGLIFCONF return? 118 */ 119 ifn.lifn_family = AF_UNSPEC; 120 ifn.lifn_flags = 0; 121 ifn.lifn_count = 0; 122 if (ioctl(fd4, SIOCGLIFNUM, (char *)&ifn) < 0) { 123 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, 124 "SIOCGLIFNUM: %s", pcap_strerror(errno)); 125 (void)close(fd6); 126 (void)close(fd4); 127 return (-1); 128 } 129 130 /* 131 * Allocate a buffer for those entries. 132 */ 133 buf_size = ifn.lifn_count * sizeof (struct lifreq); 134 buf = malloc(buf_size); 135 if (buf == NULL) { 136 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, 137 "malloc: %s", pcap_strerror(errno)); 138 (void)close(fd6); 139 (void)close(fd4); 140 return (-1); 141 } 142 143 /* 144 * Get the entries. 145 */ 146 ifc.lifc_len = buf_size; 147 ifc.lifc_buf = buf; 148 ifc.lifc_family = AF_UNSPEC; 149 ifc.lifc_flags = 0; 150 memset(buf, 0, buf_size); 151 if (ioctl(fd4, SIOCGLIFCONF, (char *)&ifc) < 0) { 152 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, 153 "SIOCGLIFCONF: %s", pcap_strerror(errno)); 154 (void)close(fd6); 155 (void)close(fd4); 156 free(buf); 157 return (-1); 158 } 159 160 /* 161 * Loop over the entries. 162 */ 163 ifrp = (struct lifreq *)buf; 164 ifend = (struct lifreq *)(buf + ifc.lifc_len); 165 166 for (; ifrp < ifend; ifrp++) { 167 /* 168 * IPv6 or not? 169 */ 170 if (((struct sockaddr *)&ifrp->lifr_addr)->sa_family == AF_INET6) 171 fd = fd6; 172 else 173 fd = fd4; 174 175 /* 176 * Skip entries that begin with "dummy". 177 * XXX - what are these? Is this Linux-specific? 178 * Are there platforms on which we shouldn't do this? 179 */ 180 if (strncmp(ifrp->lifr_name, "dummy", 5) == 0) 181 continue; 182 183 #ifdef HAVE_SOLARIS 184 /* 185 * Skip entries that have a ":" followed by a number 186 * at the end - those are Solaris virtual interfaces 187 * on which you can't capture. 188 */ 189 p = strchr(ifrp->lifr_name, ':'); 190 if (p != NULL) { 191 /* 192 * We have a ":"; is it followed by a number? 193 */ 194 while (isdigit((unsigned char)*p)) 195 p++; 196 if (*p == '\0') { 197 /* 198 * All digits after the ":" until the end. 199 */ 200 continue; 201 } 202 } 203 #endif 204 205 /* 206 * Get the flags for this interface. 207 */ 208 strncpy(ifrflags.lifr_name, ifrp->lifr_name, 209 sizeof(ifrflags.lifr_name)); 210 if (ioctl(fd, SIOCGLIFFLAGS, (char *)&ifrflags) < 0) { 211 if (errno == ENXIO) 212 continue; 213 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, 214 "SIOCGLIFFLAGS: %.*s: %s", 215 (int)sizeof(ifrflags.lifr_name), 216 ifrflags.lifr_name, 217 pcap_strerror(errno)); 218 ret = -1; 219 break; 220 } 221 222 /* 223 * Get the netmask for this address on this interface. 224 */ 225 strncpy(ifrnetmask.lifr_name, ifrp->lifr_name, 226 sizeof(ifrnetmask.lifr_name)); 227 memcpy(&ifrnetmask.lifr_addr, &ifrp->lifr_addr, 228 sizeof(ifrnetmask.lifr_addr)); 229 if (ioctl(fd, SIOCGLIFNETMASK, (char *)&ifrnetmask) < 0) { 230 if (errno == EADDRNOTAVAIL) { 231 /* 232 * Not available. 233 */ 234 netmask = NULL; 235 } else { 236 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, 237 "SIOCGLIFNETMASK: %.*s: %s", 238 (int)sizeof(ifrnetmask.lifr_name), 239 ifrnetmask.lifr_name, 240 pcap_strerror(errno)); 241 ret = -1; 242 break; 243 } 244 } else 245 netmask = (struct sockaddr *)&ifrnetmask.lifr_addr; 246 247 /* 248 * Get the broadcast address for this address on this 249 * interface (if any). 250 */ 251 if (ifrflags.lifr_flags & IFF_BROADCAST) { 252 strncpy(ifrbroadaddr.lifr_name, ifrp->lifr_name, 253 sizeof(ifrbroadaddr.lifr_name)); 254 memcpy(&ifrbroadaddr.lifr_addr, &ifrp->lifr_addr, 255 sizeof(ifrbroadaddr.lifr_addr)); 256 if (ioctl(fd, SIOCGLIFBRDADDR, 257 (char *)&ifrbroadaddr) < 0) { 258 if (errno == EADDRNOTAVAIL) { 259 /* 260 * Not available. 261 */ 262 broadaddr = NULL; 263 } else { 264 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, 265 "SIOCGLIFBRDADDR: %.*s: %s", 266 (int)sizeof(ifrbroadaddr.lifr_name), 267 ifrbroadaddr.lifr_name, 268 pcap_strerror(errno)); 269 ret = -1; 270 break; 271 } 272 } else 273 broadaddr = (struct sockaddr *)&ifrbroadaddr.lifr_broadaddr; 274 } else { 275 /* 276 * Not a broadcast interface, so no broadcast 277 * address. 278 */ 279 broadaddr = NULL; 280 } 281 282 /* 283 * Get the destination address for this address on this 284 * interface (if any). 285 */ 286 if (ifrflags.lifr_flags & IFF_POINTOPOINT) { 287 strncpy(ifrdstaddr.lifr_name, ifrp->lifr_name, 288 sizeof(ifrdstaddr.lifr_name)); 289 memcpy(&ifrdstaddr.lifr_addr, &ifrp->lifr_addr, 290 sizeof(ifrdstaddr.lifr_addr)); 291 if (ioctl(fd, SIOCGLIFDSTADDR, 292 (char *)&ifrdstaddr) < 0) { 293 if (errno == EADDRNOTAVAIL) { 294 /* 295 * Not available. 296 */ 297 dstaddr = NULL; 298 } else { 299 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, 300 "SIOCGLIFDSTADDR: %.*s: %s", 301 (int)sizeof(ifrdstaddr.lifr_name), 302 ifrdstaddr.lifr_name, 303 pcap_strerror(errno)); 304 ret = -1; 305 break; 306 } 307 } else 308 dstaddr = (struct sockaddr *)&ifrdstaddr.lifr_dstaddr; 309 } else 310 dstaddr = NULL; 311 312 #ifdef HAVE_SOLARIS 313 /* 314 * If this entry has a colon followed by a number at 315 * the end, it's a logical interface. Those are just 316 * the way you assign multiple IP addresses to a real 317 * interface, so an entry for a logical interface should 318 * be treated like the entry for the real interface; 319 * we do that by stripping off the ":" and the number. 320 */ 321 p = strchr(ifrp->lifr_name, ':'); 322 if (p != NULL) { 323 /* 324 * We have a ":"; is it followed by a number? 325 */ 326 q = p + 1; 327 while (isdigit((unsigned char)*q)) 328 q++; 329 if (*q == '\0') { 330 /* 331 * All digits after the ":" until the end. 332 * Strip off the ":" and everything after 333 * it. 334 */ 335 *p = '\0'; 336 } 337 } 338 #endif 339 340 /* 341 * Add information for this address to the list. 342 */ 343 if (add_addr_to_iflist(&devlist, ifrp->lifr_name, 344 ifrflags.lifr_flags, (struct sockaddr *)&ifrp->lifr_addr, 345 sizeof (struct sockaddr_storage), 346 netmask, sizeof (struct sockaddr_storage), 347 broadaddr, sizeof (struct sockaddr_storage), 348 dstaddr, sizeof (struct sockaddr_storage), errbuf) < 0) { 349 ret = -1; 350 break; 351 } 352 } 353 free(buf); 354 (void)close(fd6); 355 (void)close(fd4); 356 357 if (ret == -1) { 358 /* 359 * We had an error; free the list we've been constructing. 360 */ 361 if (devlist != NULL) { 362 pcap_freealldevs(devlist); 363 devlist = NULL; 364 } 365 } 366 367 *alldevsp = devlist; 368 return (ret); 369 } 370