| /* -*- Mode: c; tab-width: 8; indent-tabs-mode: 1; c-basic-offset: 8; -*- */ |
| /* |
| * Copyright (c) 1994, 1995, 1996, 1997, 1998 |
| * The Regents of the University of California. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. All advertising materials mentioning features or use of this software |
| * must display the following acknowledgement: |
| * This product includes software developed by the Computer Systems |
| * Engineering Group at Lawrence Berkeley Laboratory. |
| * 4. Neither the name of the University nor of the Laboratory may be used |
| * to endorse or promote products derived from this software without |
| * specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| */ |
| |
| #ifndef lint |
| static const char rcsid[] _U_ = |
| "@(#) $Header: /tcpdump/master/libpcap/fad-glifc.c,v 1.7 2008-01-30 09:35:48 guy Exp $ (LBL)"; |
| #endif |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #include <sys/param.h> |
| #include <sys/file.h> |
| #include <sys/ioctl.h> |
| #include <sys/socket.h> |
| #ifdef HAVE_SYS_SOCKIO_H |
| #include <sys/sockio.h> |
| #endif |
| #include <sys/time.h> /* concession to AIX */ |
| |
| struct mbuf; /* Squelch compiler warnings on some platforms for */ |
| struct rtentry; /* declarations in <net/if.h> */ |
| #include <net/if.h> |
| #include <netinet/in.h> |
| |
| #include <ctype.h> |
| #include <errno.h> |
| #include <memory.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <unistd.h> |
| |
| #include "pcap-int.h" |
| |
| #ifdef HAVE_OS_PROTO_H |
| #include "os-proto.h" |
| #endif |
| |
| /* |
| * Get a list of all interfaces that are up and that we can open. |
| * Returns -1 on error, 0 otherwise. |
| * The list, as returned through "alldevsp", may be null if no interfaces |
| * were up and could be opened. |
| * |
| * This is the implementation used on platforms that have SIOCGLIFCONF |
| * but don't have "getifaddrs()". (Solaris 8 and later; we use |
| * SIOCGLIFCONF rather than SIOCGIFCONF in order to get IPv6 addresses.) |
| */ |
| int |
| pcap_findalldevs(pcap_if_t **alldevsp, char *errbuf) |
| { |
| pcap_if_t *devlist = NULL; |
| register int fd4, fd6, fd; |
| register struct lifreq *ifrp, *ifend; |
| struct lifnum ifn; |
| struct lifconf ifc; |
| char *buf = NULL; |
| unsigned buf_size; |
| #ifdef HAVE_SOLARIS |
| char *p, *q; |
| #endif |
| struct lifreq ifrflags, ifrnetmask, ifrbroadaddr, ifrdstaddr; |
| struct sockaddr *netmask, *broadaddr, *dstaddr; |
| int ret = 0; |
| |
| /* |
| * Create a socket from which to fetch the list of interfaces, |
| * and from which to fetch IPv4 information. |
| */ |
| fd4 = socket(AF_INET, SOCK_DGRAM, 0); |
| if (fd4 < 0) { |
| (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, |
| "socket: %s", pcap_strerror(errno)); |
| return (-1); |
| } |
| |
| /* |
| * Create a socket from which to fetch IPv6 information. |
| */ |
| fd6 = socket(AF_INET6, SOCK_DGRAM, 0); |
| if (fd6 < 0) { |
| (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, |
| "socket: %s", pcap_strerror(errno)); |
| (void)close(fd4); |
| return (-1); |
| } |
| |
| /* |
| * How many entries will SIOCGLIFCONF return? |
| */ |
| ifn.lifn_family = AF_UNSPEC; |
| ifn.lifn_flags = 0; |
| ifn.lifn_count = 0; |
| if (ioctl(fd4, SIOCGLIFNUM, (char *)&ifn) < 0) { |
| (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, |
| "SIOCGLIFNUM: %s", pcap_strerror(errno)); |
| (void)close(fd6); |
| (void)close(fd4); |
| return (-1); |
| } |
| |
| /* |
| * Allocate a buffer for those entries. |
| */ |
| buf_size = ifn.lifn_count * sizeof (struct lifreq); |
| buf = malloc(buf_size); |
| if (buf == NULL) { |
| (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, |
| "malloc: %s", pcap_strerror(errno)); |
| (void)close(fd6); |
| (void)close(fd4); |
| return (-1); |
| } |
| |
| /* |
| * Get the entries. |
| */ |
| ifc.lifc_len = buf_size; |
| ifc.lifc_buf = buf; |
| ifc.lifc_family = AF_UNSPEC; |
| ifc.lifc_flags = 0; |
| memset(buf, 0, buf_size); |
| if (ioctl(fd4, SIOCGLIFCONF, (char *)&ifc) < 0) { |
| (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, |
| "SIOCGLIFCONF: %s", pcap_strerror(errno)); |
| (void)close(fd6); |
| (void)close(fd4); |
| free(buf); |
| return (-1); |
| } |
| |
| /* |
| * Loop over the entries. |
| */ |
| ifrp = (struct lifreq *)buf; |
| ifend = (struct lifreq *)(buf + ifc.lifc_len); |
| |
| for (; ifrp < ifend; ifrp++) { |
| /* |
| * IPv6 or not? |
| */ |
| if (((struct sockaddr *)&ifrp->lifr_addr)->sa_family == AF_INET6) |
| fd = fd6; |
| else |
| fd = fd4; |
| |
| /* |
| * Skip entries that begin with "dummy". |
| * XXX - what are these? Is this Linux-specific? |
| * Are there platforms on which we shouldn't do this? |
| */ |
| if (strncmp(ifrp->lifr_name, "dummy", 5) == 0) |
| continue; |
| |
| #ifdef HAVE_SOLARIS |
| /* |
| * Skip entries that have a ":" followed by a number |
| * at the end - those are Solaris virtual interfaces |
| * on which you can't capture. |
| */ |
| p = strchr(ifrp->lifr_name, ':'); |
| if (p != NULL) { |
| /* |
| * We have a ":"; is it followed by a number? |
| */ |
| while (isdigit((unsigned char)*p)) |
| p++; |
| if (*p == '\0') { |
| /* |
| * All digits after the ":" until the end. |
| */ |
| continue; |
| } |
| } |
| #endif |
| |
| /* |
| * Get the flags for this interface, and skip it if it's |
| * not up. |
| */ |
| strncpy(ifrflags.lifr_name, ifrp->lifr_name, |
| sizeof(ifrflags.lifr_name)); |
| if (ioctl(fd, SIOCGLIFFLAGS, (char *)&ifrflags) < 0) { |
| if (errno == ENXIO) |
| continue; |
| (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, |
| "SIOCGLIFFLAGS: %.*s: %s", |
| (int)sizeof(ifrflags.lifr_name), |
| ifrflags.lifr_name, |
| pcap_strerror(errno)); |
| ret = -1; |
| break; |
| } |
| if (!(ifrflags.lifr_flags & IFF_UP)) |
| continue; |
| |
| /* |
| * Get the netmask for this address on this interface. |
| */ |
| strncpy(ifrnetmask.lifr_name, ifrp->lifr_name, |
| sizeof(ifrnetmask.lifr_name)); |
| memcpy(&ifrnetmask.lifr_addr, &ifrp->lifr_addr, |
| sizeof(ifrnetmask.lifr_addr)); |
| if (ioctl(fd, SIOCGLIFNETMASK, (char *)&ifrnetmask) < 0) { |
| if (errno == EADDRNOTAVAIL) { |
| /* |
| * Not available. |
| */ |
| netmask = NULL; |
| } else { |
| (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, |
| "SIOCGLIFNETMASK: %.*s: %s", |
| (int)sizeof(ifrnetmask.lifr_name), |
| ifrnetmask.lifr_name, |
| pcap_strerror(errno)); |
| ret = -1; |
| break; |
| } |
| } else |
| netmask = (struct sockaddr *)&ifrnetmask.lifr_addr; |
| |
| /* |
| * Get the broadcast address for this address on this |
| * interface (if any). |
| */ |
| if (ifrflags.lifr_flags & IFF_BROADCAST) { |
| strncpy(ifrbroadaddr.lifr_name, ifrp->lifr_name, |
| sizeof(ifrbroadaddr.lifr_name)); |
| memcpy(&ifrbroadaddr.lifr_addr, &ifrp->lifr_addr, |
| sizeof(ifrbroadaddr.lifr_addr)); |
| if (ioctl(fd, SIOCGLIFBRDADDR, |
| (char *)&ifrbroadaddr) < 0) { |
| if (errno == EADDRNOTAVAIL) { |
| /* |
| * Not available. |
| */ |
| broadaddr = NULL; |
| } else { |
| (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, |
| "SIOCGLIFBRDADDR: %.*s: %s", |
| (int)sizeof(ifrbroadaddr.lifr_name), |
| ifrbroadaddr.lifr_name, |
| pcap_strerror(errno)); |
| ret = -1; |
| break; |
| } |
| } else |
| broadaddr = (struct sockaddr *)&ifrbroadaddr.lifr_broadaddr; |
| } else { |
| /* |
| * Not a broadcast interface, so no broadcast |
| * address. |
| */ |
| broadaddr = NULL; |
| } |
| |
| /* |
| * Get the destination address for this address on this |
| * interface (if any). |
| */ |
| if (ifrflags.lifr_flags & IFF_POINTOPOINT) { |
| strncpy(ifrdstaddr.lifr_name, ifrp->lifr_name, |
| sizeof(ifrdstaddr.lifr_name)); |
| memcpy(&ifrdstaddr.lifr_addr, &ifrp->lifr_addr, |
| sizeof(ifrdstaddr.lifr_addr)); |
| if (ioctl(fd, SIOCGLIFDSTADDR, |
| (char *)&ifrdstaddr) < 0) { |
| if (errno == EADDRNOTAVAIL) { |
| /* |
| * Not available. |
| */ |
| dstaddr = NULL; |
| } else { |
| (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, |
| "SIOCGLIFDSTADDR: %.*s: %s", |
| (int)sizeof(ifrdstaddr.lifr_name), |
| ifrdstaddr.lifr_name, |
| pcap_strerror(errno)); |
| ret = -1; |
| break; |
| } |
| } else |
| dstaddr = (struct sockaddr *)&ifrdstaddr.lifr_dstaddr; |
| } else |
| dstaddr = NULL; |
| |
| #ifdef HAVE_SOLARIS |
| /* |
| * If this entry has a colon followed by a number at |
| * the end, it's a logical interface. Those are just |
| * the way you assign multiple IP addresses to a real |
| * interface, so an entry for a logical interface should |
| * be treated like the entry for the real interface; |
| * we do that by stripping off the ":" and the number. |
| */ |
| p = strchr(ifrp->lifr_name, ':'); |
| if (p != NULL) { |
| /* |
| * We have a ":"; is it followed by a number? |
| */ |
| q = p + 1; |
| while (isdigit((unsigned char)*q)) |
| q++; |
| if (*q == '\0') { |
| /* |
| * All digits after the ":" until the end. |
| * Strip off the ":" and everything after |
| * it. |
| */ |
| *p = '\0'; |
| } |
| } |
| #endif |
| |
| /* |
| * Add information for this address to the list. |
| */ |
| if (add_addr_to_iflist(&devlist, ifrp->lifr_name, |
| ifrflags.lifr_flags, (struct sockaddr *)&ifrp->lifr_addr, |
| sizeof (struct sockaddr_storage), |
| netmask, sizeof (struct sockaddr_storage), |
| broadaddr, sizeof (struct sockaddr_storage), |
| dstaddr, sizeof (struct sockaddr_storage), errbuf) < 0) { |
| ret = -1; |
| break; |
| } |
| } |
| free(buf); |
| (void)close(fd6); |
| (void)close(fd4); |
| |
| if (ret != -1) { |
| /* |
| * We haven't had any errors yet; do any platform-specific |
| * operations to add devices. |
| */ |
| if (pcap_platform_finddevs(&devlist, errbuf) < 0) |
| ret = -1; |
| } |
| |
| if (ret == -1) { |
| /* |
| * We had an error; free the list we've been constructing. |
| */ |
| if (devlist != NULL) { |
| pcap_freealldevs(devlist); |
| devlist = NULL; |
| } |
| } |
| |
| *alldevsp = devlist; |
| return (ret); |
| } |