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 <errno.h> 54 #include <memory.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <unistd.h> 59 60 #include "pcap-int.h" 61 62 #ifdef HAVE_OS_PROTO_H 63 #include "os-proto.h" 64 #endif 65 66 /* 67 * Get a list of all interfaces that are up and that we can open. 68 * Returns -1 on error, 0 otherwise. 69 * The list, as returned through "alldevsp", may be null if no interfaces 70 * were up and could be opened. 71 * 72 * This is the implementation used on platforms that have SIOCGLIFCONF 73 * but don't have "getifaddrs()". (Solaris 8 and later; we use 74 * SIOCGLIFCONF rather than SIOCGIFCONF in order to get IPv6 addresses.) 75 */ 76 int 77 pcap_findalldevs_interfaces(pcap_if_list_t *devlistp, char *errbuf, 78 int (*check_usable)(const char *), get_if_flags_func get_flags_func) 79 { 80 register int fd4, fd6, fd; 81 register struct lifreq *ifrp, *ifend; 82 struct lifnum ifn; 83 struct lifconf ifc; 84 char *buf = NULL; 85 unsigned buf_size; 86 #ifdef HAVE_SOLARIS 87 char *p, *q; 88 #endif 89 struct lifreq ifrflags, ifrnetmask, ifrbroadaddr, ifrdstaddr; 90 struct sockaddr *netmask, *broadaddr, *dstaddr; 91 int ret = 0; 92 93 /* 94 * Create a socket from which to fetch the list of interfaces, 95 * and from which to fetch IPv4 information. 96 */ 97 fd4 = socket(AF_INET, SOCK_DGRAM, 0); 98 if (fd4 < 0) { 99 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, 100 errno, "socket: AF_INET"); 101 return (-1); 102 } 103 104 /* 105 * Create a socket from which to fetch IPv6 information. 106 */ 107 fd6 = socket(AF_INET6, SOCK_DGRAM, 0); 108 if (fd6 < 0) { 109 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, 110 errno, "socket: AF_INET6"); 111 (void)close(fd4); 112 return (-1); 113 } 114 115 /* 116 * How many entries will SIOCGLIFCONF return? 117 */ 118 ifn.lifn_family = AF_UNSPEC; 119 ifn.lifn_flags = 0; 120 ifn.lifn_count = 0; 121 if (ioctl(fd4, SIOCGLIFNUM, (char *)&ifn) < 0) { 122 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, 123 errno, "SIOCGLIFNUM"); 124 (void)close(fd6); 125 (void)close(fd4); 126 return (-1); 127 } 128 129 /* 130 * Allocate a buffer for those entries. 131 */ 132 buf_size = ifn.lifn_count * sizeof (struct lifreq); 133 buf = malloc(buf_size); 134 if (buf == NULL) { 135 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, 136 errno, "malloc"); 137 (void)close(fd6); 138 (void)close(fd4); 139 return (-1); 140 } 141 142 /* 143 * Get the entries. 144 */ 145 ifc.lifc_len = buf_size; 146 ifc.lifc_buf = buf; 147 ifc.lifc_family = AF_UNSPEC; 148 ifc.lifc_flags = 0; 149 memset(buf, 0, buf_size); 150 if (ioctl(fd4, SIOCGLIFCONF, (char *)&ifc) < 0) { 151 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, 152 errno, "SIOCGLIFCONF"); 153 (void)close(fd6); 154 (void)close(fd4); 155 free(buf); 156 return (-1); 157 } 158 159 /* 160 * Loop over the entries. 161 */ 162 ifrp = (struct lifreq *)buf; 163 ifend = (struct lifreq *)(buf + ifc.lifc_len); 164 165 for (; ifrp < ifend; ifrp++) { 166 /* 167 * Skip entries that begin with "dummy". 168 * XXX - what are these? Is this Linux-specific? 169 * Are there platforms on which we shouldn't do this? 170 */ 171 if (strncmp(ifrp->lifr_name, "dummy", 5) == 0) 172 continue; 173 174 /* 175 * Can we capture on this device? 176 */ 177 if (!(*check_usable)(ifrp->lifr_name)) { 178 /* 179 * No. 180 */ 181 continue; 182 } 183 184 /* 185 * IPv6 or not? 186 */ 187 if (((struct sockaddr *)&ifrp->lifr_addr)->sa_family == AF_INET6) 188 fd = fd6; 189 else 190 fd = fd4; 191 192 /* 193 * Get the flags for this interface. 194 */ 195 strncpy(ifrflags.lifr_name, ifrp->lifr_name, 196 sizeof(ifrflags.lifr_name)); 197 if (ioctl(fd, SIOCGLIFFLAGS, (char *)&ifrflags) < 0) { 198 if (errno == ENXIO) 199 continue; 200 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, 201 errno, "SIOCGLIFFLAGS: %.*s", 202 (int)sizeof(ifrflags.lifr_name), 203 ifrflags.lifr_name); 204 ret = -1; 205 break; 206 } 207 208 /* 209 * Get the netmask for this address on this interface. 210 */ 211 strncpy(ifrnetmask.lifr_name, ifrp->lifr_name, 212 sizeof(ifrnetmask.lifr_name)); 213 memcpy(&ifrnetmask.lifr_addr, &ifrp->lifr_addr, 214 sizeof(ifrnetmask.lifr_addr)); 215 if (ioctl(fd, SIOCGLIFNETMASK, (char *)&ifrnetmask) < 0) { 216 if (errno == EADDRNOTAVAIL) { 217 /* 218 * Not available. 219 */ 220 netmask = NULL; 221 } else { 222 pcap_fmt_errmsg_for_errno(errbuf, 223 PCAP_ERRBUF_SIZE, errno, 224 "SIOCGLIFNETMASK: %.*s", 225 (int)sizeof(ifrnetmask.lifr_name), 226 ifrnetmask.lifr_name); 227 ret = -1; 228 break; 229 } 230 } else 231 netmask = (struct sockaddr *)&ifrnetmask.lifr_addr; 232 233 /* 234 * Get the broadcast address for this address on this 235 * interface (if any). 236 */ 237 if (ifrflags.lifr_flags & IFF_BROADCAST) { 238 strncpy(ifrbroadaddr.lifr_name, ifrp->lifr_name, 239 sizeof(ifrbroadaddr.lifr_name)); 240 memcpy(&ifrbroadaddr.lifr_addr, &ifrp->lifr_addr, 241 sizeof(ifrbroadaddr.lifr_addr)); 242 if (ioctl(fd, SIOCGLIFBRDADDR, 243 (char *)&ifrbroadaddr) < 0) { 244 if (errno == EADDRNOTAVAIL) { 245 /* 246 * Not available. 247 */ 248 broadaddr = NULL; 249 } else { 250 pcap_fmt_errmsg_for_errno(errbuf, 251 PCAP_ERRBUF_SIZE, errno, 252 "SIOCGLIFBRDADDR: %.*s", 253 (int)sizeof(ifrbroadaddr.lifr_name), 254 ifrbroadaddr.lifr_name); 255 ret = -1; 256 break; 257 } 258 } else 259 broadaddr = (struct sockaddr *)&ifrbroadaddr.lifr_broadaddr; 260 } else { 261 /* 262 * Not a broadcast interface, so no broadcast 263 * address. 264 */ 265 broadaddr = NULL; 266 } 267 268 /* 269 * Get the destination address for this address on this 270 * interface (if any). 271 */ 272 if (ifrflags.lifr_flags & IFF_POINTOPOINT) { 273 strncpy(ifrdstaddr.lifr_name, ifrp->lifr_name, 274 sizeof(ifrdstaddr.lifr_name)); 275 memcpy(&ifrdstaddr.lifr_addr, &ifrp->lifr_addr, 276 sizeof(ifrdstaddr.lifr_addr)); 277 if (ioctl(fd, SIOCGLIFDSTADDR, 278 (char *)&ifrdstaddr) < 0) { 279 if (errno == EADDRNOTAVAIL) { 280 /* 281 * Not available. 282 */ 283 dstaddr = NULL; 284 } else { 285 pcap_fmt_errmsg_for_errno(errbuf, 286 PCAP_ERRBUF_SIZE, errno, 287 "SIOCGLIFDSTADDR: %.*s", 288 (int)sizeof(ifrdstaddr.lifr_name), 289 ifrdstaddr.lifr_name); 290 ret = -1; 291 break; 292 } 293 } else 294 dstaddr = (struct sockaddr *)&ifrdstaddr.lifr_dstaddr; 295 } else 296 dstaddr = NULL; 297 298 #ifdef HAVE_SOLARIS 299 /* 300 * If this entry has a colon followed by a number at 301 * the end, it's a logical interface. Those are just 302 * the way you assign multiple IP addresses to a real 303 * interface, so an entry for a logical interface should 304 * be treated like the entry for the real interface; 305 * we do that by stripping off the ":" and the number. 306 */ 307 p = strchr(ifrp->lifr_name, ':'); 308 if (p != NULL) { 309 /* 310 * We have a ":"; is it followed by a number? 311 */ 312 q = p + 1; 313 while (PCAP_ISDIGIT(*q)) 314 q++; 315 if (*q == '\0') { 316 /* 317 * All digits after the ":" until the end. 318 * Strip off the ":" and everything after 319 * it. 320 */ 321 *p = '\0'; 322 } 323 } 324 #endif 325 326 /* 327 * Add information for this address to the list. 328 */ 329 if (add_addr_to_if(devlistp, ifrp->lifr_name, 330 ifrflags.lifr_flags, get_flags_func, 331 (struct sockaddr *)&ifrp->lifr_addr, 332 sizeof (struct sockaddr_storage), 333 netmask, sizeof (struct sockaddr_storage), 334 broadaddr, sizeof (struct sockaddr_storage), 335 dstaddr, sizeof (struct sockaddr_storage), errbuf) < 0) { 336 ret = -1; 337 break; 338 } 339 } 340 free(buf); 341 (void)close(fd6); 342 (void)close(fd4); 343 344 return (ret); 345 } 346