1335640Shselasky/* -*- Mode: c; tab-width: 8; indent-tabs-mode: 1; c-basic-offset: 8; -*- */ 2335640Shselasky/* 3335640Shselasky * Copyright (c) 1994, 1995, 1996, 1997, 1998 4335640Shselasky * The Regents of the University of California. All rights reserved. 5335640Shselasky * 6335640Shselasky * Redistribution and use in source and binary forms, with or without 7335640Shselasky * modification, are permitted provided that the following conditions 8335640Shselasky * are met: 9335640Shselasky * 1. Redistributions of source code must retain the above copyright 10335640Shselasky * notice, this list of conditions and the following disclaimer. 11335640Shselasky * 2. Redistributions in binary form must reproduce the above copyright 12335640Shselasky * notice, this list of conditions and the following disclaimer in the 13335640Shselasky * documentation and/or other materials provided with the distribution. 14335640Shselasky * 3. All advertising materials mentioning features or use of this software 15335640Shselasky * must display the following acknowledgement: 16335640Shselasky * This product includes software developed by the Computer Systems 17335640Shselasky * Engineering Group at Lawrence Berkeley Laboratory. 18335640Shselasky * 4. Neither the name of the University nor of the Laboratory may be used 19335640Shselasky * to endorse or promote products derived from this software without 20335640Shselasky * specific prior written permission. 21335640Shselasky * 22335640Shselasky * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23335640Shselasky * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24335640Shselasky * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25335640Shselasky * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26335640Shselasky * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27335640Shselasky * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28335640Shselasky * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29335640Shselasky * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30335640Shselasky * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31335640Shselasky * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32335640Shselasky * SUCH DAMAGE. 33335640Shselasky */ 34335640Shselasky 35335640Shselasky#ifdef HAVE_CONFIG_H 36335640Shselasky#include <config.h> 37335640Shselasky#endif 38335640Shselasky 39335640Shselasky#include <sys/param.h> 40335640Shselasky#include <sys/file.h> 41335640Shselasky#include <sys/ioctl.h> 42335640Shselasky#include <sys/socket.h> 43335640Shselasky#ifdef HAVE_SYS_SOCKIO_H 44335640Shselasky#include <sys/sockio.h> 45335640Shselasky#endif 46335640Shselasky#include <sys/time.h> /* concession to AIX */ 47335640Shselasky 48335640Shselaskystruct mbuf; /* Squelch compiler warnings on some platforms for */ 49335640Shselaskystruct rtentry; /* declarations in <net/if.h> */ 50335640Shselasky#include <net/if.h> 51335640Shselasky#include <netinet/in.h> 52335640Shselasky 53335640Shselasky#include <ctype.h> 54335640Shselasky#include <errno.h> 55335640Shselasky#include <memory.h> 56335640Shselasky#include <stdio.h> 57335640Shselasky#include <stdlib.h> 58335640Shselasky#include <string.h> 59335640Shselasky#include <unistd.h> 60335640Shselasky 61335640Shselasky#include "pcap-int.h" 62335640Shselasky 63335640Shselasky#ifdef HAVE_OS_PROTO_H 64335640Shselasky#include "os-proto.h" 65335640Shselasky#endif 66335640Shselasky 67335640Shselasky/* 68335640Shselasky * Get a list of all interfaces that are up and that we can open. 69335640Shselasky * Returns -1 on error, 0 otherwise. 70335640Shselasky * The list, as returned through "alldevsp", may be null if no interfaces 71335640Shselasky * were up and could be opened. 72335640Shselasky * 73335640Shselasky * This is the implementation used on platforms that have SIOCGLIFCONF 74335640Shselasky * but don't have "getifaddrs()". (Solaris 8 and later; we use 75335640Shselasky * SIOCGLIFCONF rather than SIOCGIFCONF in order to get IPv6 addresses.) 76335640Shselasky */ 77335640Shselaskyint 78335640Shselaskypcap_findalldevs_interfaces(pcap_if_list_t *devlistp, char *errbuf, 79335640Shselasky int (*check_usable)(const char *), get_if_flags_func get_flags_func) 80335640Shselasky{ 81335640Shselasky register int fd4, fd6, fd; 82335640Shselasky register struct lifreq *ifrp, *ifend; 83335640Shselasky struct lifnum ifn; 84335640Shselasky struct lifconf ifc; 85335640Shselasky char *buf = NULL; 86335640Shselasky unsigned buf_size; 87335640Shselasky#ifdef HAVE_SOLARIS 88335640Shselasky char *p, *q; 89335640Shselasky#endif 90335640Shselasky struct lifreq ifrflags, ifrnetmask, ifrbroadaddr, ifrdstaddr; 91335640Shselasky struct sockaddr *netmask, *broadaddr, *dstaddr; 92335640Shselasky int ret = 0; 93335640Shselasky 94335640Shselasky /* 95335640Shselasky * Create a socket from which to fetch the list of interfaces, 96335640Shselasky * and from which to fetch IPv4 information. 97335640Shselasky */ 98335640Shselasky fd4 = socket(AF_INET, SOCK_DGRAM, 0); 99335640Shselasky if (fd4 < 0) { 100335640Shselasky pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, 101335640Shselasky errno, "socket: AF_INET"); 102335640Shselasky return (-1); 103335640Shselasky } 104335640Shselasky 105335640Shselasky /* 106335640Shselasky * Create a socket from which to fetch IPv6 information. 107335640Shselasky */ 108335640Shselasky fd6 = socket(AF_INET6, SOCK_DGRAM, 0); 109335640Shselasky if (fd6 < 0) { 110335640Shselasky pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, 111335640Shselasky errno, "socket: AF_INET6"); 112335640Shselasky (void)close(fd4); 113335640Shselasky return (-1); 114335640Shselasky } 115335640Shselasky 116335640Shselasky /* 117335640Shselasky * How many entries will SIOCGLIFCONF return? 118335640Shselasky */ 119335640Shselasky ifn.lifn_family = AF_UNSPEC; 120335640Shselasky ifn.lifn_flags = 0; 121335640Shselasky ifn.lifn_count = 0; 122335640Shselasky if (ioctl(fd4, SIOCGLIFNUM, (char *)&ifn) < 0) { 123335640Shselasky pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, 124335640Shselasky errno, "SIOCGLIFNUM"); 125335640Shselasky (void)close(fd6); 126335640Shselasky (void)close(fd4); 127335640Shselasky return (-1); 128335640Shselasky } 129335640Shselasky 130335640Shselasky /* 131335640Shselasky * Allocate a buffer for those entries. 132335640Shselasky */ 133335640Shselasky buf_size = ifn.lifn_count * sizeof (struct lifreq); 134335640Shselasky buf = malloc(buf_size); 135335640Shselasky if (buf == NULL) { 136335640Shselasky pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, 137335640Shselasky errno, "malloc"); 138335640Shselasky (void)close(fd6); 139335640Shselasky (void)close(fd4); 140335640Shselasky return (-1); 141335640Shselasky } 142335640Shselasky 143335640Shselasky /* 144335640Shselasky * Get the entries. 145335640Shselasky */ 146335640Shselasky ifc.lifc_len = buf_size; 147335640Shselasky ifc.lifc_buf = buf; 148335640Shselasky ifc.lifc_family = AF_UNSPEC; 149335640Shselasky ifc.lifc_flags = 0; 150335640Shselasky memset(buf, 0, buf_size); 151335640Shselasky if (ioctl(fd4, SIOCGLIFCONF, (char *)&ifc) < 0) { 152335640Shselasky pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, 153335640Shselasky errno, "SIOCGLIFCONF"); 154335640Shselasky (void)close(fd6); 155335640Shselasky (void)close(fd4); 156335640Shselasky free(buf); 157335640Shselasky return (-1); 158335640Shselasky } 159335640Shselasky 160335640Shselasky /* 161335640Shselasky * Loop over the entries. 162335640Shselasky */ 163335640Shselasky ifrp = (struct lifreq *)buf; 164335640Shselasky ifend = (struct lifreq *)(buf + ifc.lifc_len); 165335640Shselasky 166335640Shselasky for (; ifrp < ifend; ifrp++) { 167335640Shselasky /* 168335640Shselasky * Skip entries that begin with "dummy". 169335640Shselasky * XXX - what are these? Is this Linux-specific? 170335640Shselasky * Are there platforms on which we shouldn't do this? 171335640Shselasky */ 172335640Shselasky if (strncmp(ifrp->lifr_name, "dummy", 5) == 0) 173335640Shselasky continue; 174335640Shselasky 175335640Shselasky /* 176335640Shselasky * Can we capture on this device? 177335640Shselasky */ 178335640Shselasky if (!(*check_usable)(ifrp->lifr_name)) { 179335640Shselasky /* 180335640Shselasky * No. 181335640Shselasky */ 182335640Shselasky continue; 183335640Shselasky } 184335640Shselasky 185335640Shselasky /* 186335640Shselasky * IPv6 or not? 187335640Shselasky */ 188335640Shselasky if (((struct sockaddr *)&ifrp->lifr_addr)->sa_family == AF_INET6) 189335640Shselasky fd = fd6; 190335640Shselasky else 191335640Shselasky fd = fd4; 192335640Shselasky 193335640Shselasky /* 194335640Shselasky * Get the flags for this interface. 195335640Shselasky */ 196335640Shselasky strncpy(ifrflags.lifr_name, ifrp->lifr_name, 197335640Shselasky sizeof(ifrflags.lifr_name)); 198335640Shselasky if (ioctl(fd, SIOCGLIFFLAGS, (char *)&ifrflags) < 0) { 199335640Shselasky if (errno == ENXIO) 200335640Shselasky continue; 201335640Shselasky pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, 202335640Shselasky errno, "SIOCGLIFFLAGS: %.*s", 203335640Shselasky (int)sizeof(ifrflags.lifr_name), 204335640Shselasky ifrflags.lifr_name); 205335640Shselasky ret = -1; 206335640Shselasky break; 207335640Shselasky } 208335640Shselasky 209335640Shselasky /* 210335640Shselasky * Get the netmask for this address on this interface. 211335640Shselasky */ 212335640Shselasky strncpy(ifrnetmask.lifr_name, ifrp->lifr_name, 213335640Shselasky sizeof(ifrnetmask.lifr_name)); 214335640Shselasky memcpy(&ifrnetmask.lifr_addr, &ifrp->lifr_addr, 215335640Shselasky sizeof(ifrnetmask.lifr_addr)); 216335640Shselasky if (ioctl(fd, SIOCGLIFNETMASK, (char *)&ifrnetmask) < 0) { 217335640Shselasky if (errno == EADDRNOTAVAIL) { 218335640Shselasky /* 219335640Shselasky * Not available. 220335640Shselasky */ 221335640Shselasky netmask = NULL; 222335640Shselasky } else { 223335640Shselasky pcap_fmt_errmsg_for_errno(errbuf, 224335640Shselasky PCAP_ERRBUF_SIZE, errno, 225335640Shselasky "SIOCGLIFNETMASK: %.*s", 226335640Shselasky (int)sizeof(ifrnetmask.lifr_name), 227335640Shselasky ifrnetmask.lifr_name); 228335640Shselasky ret = -1; 229335640Shselasky break; 230335640Shselasky } 231335640Shselasky } else 232335640Shselasky netmask = (struct sockaddr *)&ifrnetmask.lifr_addr; 233335640Shselasky 234335640Shselasky /* 235335640Shselasky * Get the broadcast address for this address on this 236335640Shselasky * interface (if any). 237335640Shselasky */ 238335640Shselasky if (ifrflags.lifr_flags & IFF_BROADCAST) { 239335640Shselasky strncpy(ifrbroadaddr.lifr_name, ifrp->lifr_name, 240335640Shselasky sizeof(ifrbroadaddr.lifr_name)); 241335640Shselasky memcpy(&ifrbroadaddr.lifr_addr, &ifrp->lifr_addr, 242335640Shselasky sizeof(ifrbroadaddr.lifr_addr)); 243335640Shselasky if (ioctl(fd, SIOCGLIFBRDADDR, 244335640Shselasky (char *)&ifrbroadaddr) < 0) { 245335640Shselasky if (errno == EADDRNOTAVAIL) { 246335640Shselasky /* 247335640Shselasky * Not available. 248335640Shselasky */ 249335640Shselasky broadaddr = NULL; 250335640Shselasky } else { 251335640Shselasky pcap_fmt_errmsg_for_errno(errbuf, 252335640Shselasky PCAP_ERRBUF_SIZE, errno, 253335640Shselasky "SIOCGLIFBRDADDR: %.*s", 254335640Shselasky (int)sizeof(ifrbroadaddr.lifr_name), 255335640Shselasky ifrbroadaddr.lifr_name); 256335640Shselasky ret = -1; 257335640Shselasky break; 258335640Shselasky } 259335640Shselasky } else 260335640Shselasky broadaddr = (struct sockaddr *)&ifrbroadaddr.lifr_broadaddr; 261335640Shselasky } else { 262335640Shselasky /* 263335640Shselasky * Not a broadcast interface, so no broadcast 264335640Shselasky * address. 265335640Shselasky */ 266335640Shselasky broadaddr = NULL; 267335640Shselasky } 268335640Shselasky 269335640Shselasky /* 270335640Shselasky * Get the destination address for this address on this 271335640Shselasky * interface (if any). 272335640Shselasky */ 273335640Shselasky if (ifrflags.lifr_flags & IFF_POINTOPOINT) { 274335640Shselasky strncpy(ifrdstaddr.lifr_name, ifrp->lifr_name, 275335640Shselasky sizeof(ifrdstaddr.lifr_name)); 276335640Shselasky memcpy(&ifrdstaddr.lifr_addr, &ifrp->lifr_addr, 277335640Shselasky sizeof(ifrdstaddr.lifr_addr)); 278335640Shselasky if (ioctl(fd, SIOCGLIFDSTADDR, 279335640Shselasky (char *)&ifrdstaddr) < 0) { 280335640Shselasky if (errno == EADDRNOTAVAIL) { 281335640Shselasky /* 282335640Shselasky * Not available. 283335640Shselasky */ 284335640Shselasky dstaddr = NULL; 285335640Shselasky } else { 286335640Shselasky pcap_fmt_errmsg_for_errno(errbuf, 287335640Shselasky PCAP_ERRBUF_SIZE, errno, 288335640Shselasky "SIOCGLIFDSTADDR: %.*s", 289335640Shselasky (int)sizeof(ifrdstaddr.lifr_name), 290335640Shselasky ifrdstaddr.lifr_name); 291335640Shselasky ret = -1; 292335640Shselasky break; 293335640Shselasky } 294335640Shselasky } else 295335640Shselasky dstaddr = (struct sockaddr *)&ifrdstaddr.lifr_dstaddr; 296335640Shselasky } else 297335640Shselasky dstaddr = NULL; 298335640Shselasky 299335640Shselasky#ifdef HAVE_SOLARIS 300335640Shselasky /* 301335640Shselasky * If this entry has a colon followed by a number at 302335640Shselasky * the end, it's a logical interface. Those are just 303335640Shselasky * the way you assign multiple IP addresses to a real 304335640Shselasky * interface, so an entry for a logical interface should 305335640Shselasky * be treated like the entry for the real interface; 306335640Shselasky * we do that by stripping off the ":" and the number. 307335640Shselasky */ 308335640Shselasky p = strchr(ifrp->lifr_name, ':'); 309335640Shselasky if (p != NULL) { 310335640Shselasky /* 311335640Shselasky * We have a ":"; is it followed by a number? 312335640Shselasky */ 313335640Shselasky q = p + 1; 314335640Shselasky while (isdigit((unsigned char)*q)) 315335640Shselasky q++; 316335640Shselasky if (*q == '\0') { 317335640Shselasky /* 318335640Shselasky * All digits after the ":" until the end. 319335640Shselasky * Strip off the ":" and everything after 320335640Shselasky * it. 321335640Shselasky */ 322335640Shselasky *p = '\0'; 323335640Shselasky } 324335640Shselasky } 325335640Shselasky#endif 326335640Shselasky 327335640Shselasky /* 328335640Shselasky * Add information for this address to the list. 329335640Shselasky */ 330335640Shselasky if (add_addr_to_if(devlistp, ifrp->lifr_name, 331335640Shselasky ifrflags.lifr_flags, get_flags_func, 332335640Shselasky (struct sockaddr *)&ifrp->lifr_addr, 333335640Shselasky sizeof (struct sockaddr_storage), 334335640Shselasky netmask, sizeof (struct sockaddr_storage), 335335640Shselasky broadaddr, sizeof (struct sockaddr_storage), 336335640Shselasky dstaddr, sizeof (struct sockaddr_storage), errbuf) < 0) { 337335640Shselasky ret = -1; 338335640Shselasky break; 339335640Shselasky } 340335640Shselasky } 341335640Shselasky free(buf); 342335640Shselasky (void)close(fd6); 343335640Shselasky (void)close(fd4); 344335640Shselasky 345335640Shselasky return (ret); 346335640Shselasky} 347