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Diffstat (limited to 'fad-getad.c')
| -rw-r--r-- | fad-getad.c | 297 |
1 files changed, 297 insertions, 0 deletions
diff --git a/fad-getad.c b/fad-getad.c new file mode 100644 index 0000000..742ae1f --- /dev/null +++ b/fad-getad.c @@ -0,0 +1,297 @@ +/* -*- 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-getad.c,v 1.12 2007-09-14 00:44:55 guy Exp $ (LBL)"; +#endif + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include <sys/types.h> +#include <sys/socket.h> +#include <netinet/in.h> + +#include <net/if.h> + +#include <ctype.h> +#include <errno.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <ifaddrs.h> + +#include "pcap-int.h" + +#ifdef HAVE_OS_PROTO_H +#include "os-proto.h" +#endif + +#ifdef AF_PACKET +# ifdef HAVE_NETPACKET_PACKET_H +/* Solaris 11 and later, Linux distributions with newer glibc */ +# include <netpacket/packet.h> +# else /* HAVE_NETPACKET_PACKET_H */ +/* LynxOS, Linux distributions with older glibc */ +# ifdef __Lynx__ +/* LynxOS */ +# include <netpacket/if_packet.h> +# else /* __Lynx__ */ +/* Linux */ +# include <linux/types.h> +# include <linux/if_packet.h> +# endif /* __Lynx__ */ +# endif /* HAVE_NETPACKET_PACKET_H */ +#endif /* AF_PACKET */ + +/* + * This is fun. + * + * In older BSD systems, socket addresses were fixed-length, and + * "sizeof (struct sockaddr)" gave the size of the structure. + * All addresses fit within a "struct sockaddr". + * + * In newer BSD systems, the socket address is variable-length, and + * there's an "sa_len" field giving the length of the structure; + * this allows socket addresses to be longer than 2 bytes of family + * and 14 bytes of data. + * + * Some commercial UNIXes use the old BSD scheme, some use the RFC 2553 + * variant of the old BSD scheme (with "struct sockaddr_storage" rather + * than "struct sockaddr"), and some use the new BSD scheme. + * + * Some versions of GNU libc use neither scheme, but has an "SA_LEN()" + * macro that determines the size based on the address family. Other + * versions don't have "SA_LEN()" (as it was in drafts of RFC 2553 + * but not in the final version). On the latter systems, we explicitly + * check the AF_ type to determine the length; we assume that on + * all those systems we have "struct sockaddr_storage". + */ +#ifndef SA_LEN +#ifdef HAVE_SOCKADDR_SA_LEN +#define SA_LEN(addr) ((addr)->sa_len) +#else /* HAVE_SOCKADDR_SA_LEN */ +#ifdef HAVE_SOCKADDR_STORAGE +static size_t +get_sa_len(struct sockaddr *addr) +{ + switch (addr->sa_family) { + +#ifdef AF_INET + case AF_INET: + return (sizeof (struct sockaddr_in)); +#endif + +#ifdef AF_INET6 + case AF_INET6: + return (sizeof (struct sockaddr_in6)); +#endif + +#ifdef AF_PACKET + case AF_PACKET: + return (sizeof (struct sockaddr_ll)); +#endif + + default: + return (sizeof (struct sockaddr)); + } +} +#define SA_LEN(addr) (get_sa_len(addr)) +#else /* HAVE_SOCKADDR_STORAGE */ +#define SA_LEN(addr) (sizeof (struct sockaddr)) +#endif /* HAVE_SOCKADDR_STORAGE */ +#endif /* HAVE_SOCKADDR_SA_LEN */ +#endif /* SA_LEN */ + +/* + * 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 "getifaddrs()". + */ +int +pcap_findalldevs(pcap_if_t **alldevsp, char *errbuf) +{ + pcap_if_t *devlist = NULL; + struct ifaddrs *ifap, *ifa; + struct sockaddr *addr, *netmask, *broadaddr, *dstaddr; + size_t addr_size, broadaddr_size, dstaddr_size; + int ret = 0; + char *p, *q; + + /* + * Get the list of interface addresses. + * + * Note: this won't return information about interfaces + * with no addresses; are there any such interfaces + * that would be capable of receiving packets? + * (Interfaces incapable of receiving packets aren't + * very interesting from libpcap's point of view.) + * + * LAN interfaces will probably have link-layer + * addresses; I don't know whether all implementations + * of "getifaddrs()" now, or in the future, will return + * those. + */ + if (getifaddrs(&ifap) != 0) { + (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, + "getifaddrs: %s", pcap_strerror(errno)); + return (-1); + } + for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) { + /* + * Is this interface up? + */ + if (!(ifa->ifa_flags & IFF_UP)) { + /* + * No, so don't add it to the list. + */ + continue; + } + + /* + * "ifa_addr" was apparently null on at least one + * interface on some system. + * + * "ifa_broadaddr" may be non-null even on + * non-broadcast interfaces, and was null on + * at least one OpenBSD 3.4 system on at least + * one interface with IFF_BROADCAST set. + * + * "ifa_dstaddr" was, on at least one FreeBSD 4.1 + * system, non-null on a non-point-to-point + * interface. + * + * Therefore, we supply the address and netmask only + * if "ifa_addr" is non-null (if there's no address, + * there's obviously no netmask), and supply the + * broadcast and destination addresses if the appropriate + * flag is set *and* the appropriate "ifa_" entry doesn't + * evaluate to a null pointer. + */ + if (ifa->ifa_addr != NULL) { + addr = ifa->ifa_addr; + addr_size = SA_LEN(addr); + netmask = ifa->ifa_netmask; + } else { + addr = NULL; + addr_size = 0; + netmask = NULL; + } + if (ifa->ifa_flags & IFF_BROADCAST && + ifa->ifa_broadaddr != NULL) { + broadaddr = ifa->ifa_broadaddr; + broadaddr_size = SA_LEN(broadaddr); + } else { + broadaddr = NULL; + broadaddr_size = 0; + } + if (ifa->ifa_flags & IFF_POINTOPOINT && + ifa->ifa_dstaddr != NULL) { + dstaddr = ifa->ifa_dstaddr; + dstaddr_size = SA_LEN(ifa->ifa_dstaddr); + } else { + dstaddr = NULL; + dstaddr_size = 0; + } + + /* + * If this entry has a colon followed by a number at + * the end, we assume it's a logical interface. Those + * are just the way you assign multiple IP addresses to + * a real interface on Linux, 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. + * + * XXX - should we do this only on Linux? + */ + p = strchr(ifa->ifa_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'; + } + } + + /* + * Add information for this address to the list. + */ + if (add_addr_to_iflist(&devlist, ifa->ifa_name, + ifa->ifa_flags, addr, addr_size, netmask, addr_size, + broadaddr, broadaddr_size, dstaddr, dstaddr_size, + errbuf) < 0) { + ret = -1; + break; + } + } + + freeifaddrs(ifap); + + 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); +} |