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_list_t *devlistp, char *errbuf, 79 int (*check_usable)(const char *), get_if_flags_func get_flags_func) 80 { 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 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, 101 errno, "socket: AF_INET"); 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 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, 111 errno, "socket: AF_INET6"); 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 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, 124 errno, "SIOCGLIFNUM"); 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 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, 137 errno, "malloc"); 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 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, 153 errno, "SIOCGLIFCONF"); 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 * Skip entries that begin with "dummy". 169 * XXX - what are these? Is this Linux-specific? 170 * Are there platforms on which we shouldn't do this? 171 */ 172 if (strncmp(ifrp->lifr_name, "dummy", 5) == 0) 173 continue; 174 175 /* 176 * Can we capture on this device? 177 */ 178 if (!(*check_usable)(ifrp->lifr_name)) { 179 /* 180 * No. 181 */ 182 continue; 183 } 184 185 /* 186 * IPv6 or not? 187 */ 188 if (((struct sockaddr *)&ifrp->lifr_addr)->sa_family == AF_INET6) 189 fd = fd6; 190 else 191 fd = fd4; 192 193 /* 194 * Get the flags for this interface. 195 */ 196 strncpy(ifrflags.lifr_name, ifrp->lifr_name, 197 sizeof(ifrflags.lifr_name)); 198 if (ioctl(fd, SIOCGLIFFLAGS, (char *)&ifrflags) < 0) { 199 if (errno == ENXIO) 200 continue; 201 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, 202 errno, "SIOCGLIFFLAGS: %.*s", 203 (int)sizeof(ifrflags.lifr_name), 204 ifrflags.lifr_name); 205 ret = -1; 206 break; 207 } 208 209 /* 210 * Get the netmask for this address on this interface. 211 */ 212 strncpy(ifrnetmask.lifr_name, ifrp->lifr_name, 213 sizeof(ifrnetmask.lifr_name)); 214 memcpy(&ifrnetmask.lifr_addr, &ifrp->lifr_addr, 215 sizeof(ifrnetmask.lifr_addr)); 216 if (ioctl(fd, SIOCGLIFNETMASK, (char *)&ifrnetmask) < 0) { 217 if (errno == EADDRNOTAVAIL) { 218 /* 219 * Not available. 220 */ 221 netmask = NULL; 222 } else { 223 pcap_fmt_errmsg_for_errno(errbuf, 224 PCAP_ERRBUF_SIZE, errno, 225 "SIOCGLIFNETMASK: %.*s", 226 (int)sizeof(ifrnetmask.lifr_name), 227 ifrnetmask.lifr_name); 228 ret = -1; 229 break; 230 } 231 } else 232 netmask = (struct sockaddr *)&ifrnetmask.lifr_addr; 233 234 /* 235 * Get the broadcast address for this address on this 236 * interface (if any). 237 */ 238 if (ifrflags.lifr_flags & IFF_BROADCAST) { 239 strncpy(ifrbroadaddr.lifr_name, ifrp->lifr_name, 240 sizeof(ifrbroadaddr.lifr_name)); 241 memcpy(&ifrbroadaddr.lifr_addr, &ifrp->lifr_addr, 242 sizeof(ifrbroadaddr.lifr_addr)); 243 if (ioctl(fd, SIOCGLIFBRDADDR, 244 (char *)&ifrbroadaddr) < 0) { 245 if (errno == EADDRNOTAVAIL) { 246 /* 247 * Not available. 248 */ 249 broadaddr = NULL; 250 } else { 251 pcap_fmt_errmsg_for_errno(errbuf, 252 PCAP_ERRBUF_SIZE, errno, 253 "SIOCGLIFBRDADDR: %.*s", 254 (int)sizeof(ifrbroadaddr.lifr_name), 255 ifrbroadaddr.lifr_name); 256 ret = -1; 257 break; 258 } 259 } else 260 broadaddr = (struct sockaddr *)&ifrbroadaddr.lifr_broadaddr; 261 } else { 262 /* 263 * Not a broadcast interface, so no broadcast 264 * address. 265 */ 266 broadaddr = NULL; 267 } 268 269 /* 270 * Get the destination address for this address on this 271 * interface (if any). 272 */ 273 if (ifrflags.lifr_flags & IFF_POINTOPOINT) { 274 strncpy(ifrdstaddr.lifr_name, ifrp->lifr_name, 275 sizeof(ifrdstaddr.lifr_name)); 276 memcpy(&ifrdstaddr.lifr_addr, &ifrp->lifr_addr, 277 sizeof(ifrdstaddr.lifr_addr)); 278 if (ioctl(fd, SIOCGLIFDSTADDR, 279 (char *)&ifrdstaddr) < 0) { 280 if (errno == EADDRNOTAVAIL) { 281 /* 282 * Not available. 283 */ 284 dstaddr = NULL; 285 } else { 286 pcap_fmt_errmsg_for_errno(errbuf, 287 PCAP_ERRBUF_SIZE, errno, 288 "SIOCGLIFDSTADDR: %.*s", 289 (int)sizeof(ifrdstaddr.lifr_name), 290 ifrdstaddr.lifr_name); 291 ret = -1; 292 break; 293 } 294 } else 295 dstaddr = (struct sockaddr *)&ifrdstaddr.lifr_dstaddr; 296 } else 297 dstaddr = NULL; 298 299 #ifdef HAVE_SOLARIS 300 /* 301 * If this entry has a colon followed by a number at 302 * the end, it's a logical interface. Those are just 303 * the way you assign multiple IP addresses to a real 304 * interface, so an entry for a logical interface should 305 * be treated like the entry for the real interface; 306 * we do that by stripping off the ":" and the number. 307 */ 308 p = strchr(ifrp->lifr_name, ':'); 309 if (p != NULL) { 310 /* 311 * We have a ":"; is it followed by a number? 312 */ 313 q = p + 1; 314 while (isdigit((unsigned char)*q)) 315 q++; 316 if (*q == '\0') { 317 /* 318 * All digits after the ":" until the end. 319 * Strip off the ":" and everything after 320 * it. 321 */ 322 *p = '\0'; 323 } 324 } 325 #endif 326 327 /* 328 * Add information for this address to the list. 329 */ 330 if (add_addr_to_if(devlistp, ifrp->lifr_name, 331 ifrflags.lifr_flags, get_flags_func, 332 (struct sockaddr *)&ifrp->lifr_addr, 333 sizeof (struct sockaddr_storage), 334 netmask, sizeof (struct sockaddr_storage), 335 broadaddr, sizeof (struct sockaddr_storage), 336 dstaddr, sizeof (struct sockaddr_storage), errbuf) < 0) { 337 ret = -1; 338 break; 339 } 340 } 341 free(buf); 342 (void)close(fd6); 343 (void)close(fd4); 344 345 return (ret); 346 } 347