280 lines
8.6 KiB
C
280 lines
8.6 KiB
C
/* -*- 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.
|
|
*/
|
|
|
|
#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 <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
|
|
|
|
/*
|
|
* We don't do this on Solaris 11 and later, as it appears there aren't
|
|
* any AF_PACKET addresses on interfaces, so we don't need this, and
|
|
* we end up including both the OS's <net/bpf.h> and our <pcap/bpf.h>,
|
|
* and their definitions of some data structures collide.
|
|
*/
|
|
#if (defined(linux) || defined(__Lynx__)) && defined(AF_PACKET)
|
|
# ifdef HAVE_NETPACKET_PACKET_H
|
|
/* 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 /* (defined(linux) || defined(__Lynx__)) && defined(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_STRUCT_SOCKADDR_SA_LEN
|
|
#define SA_LEN(addr) ((addr)->sa_len)
|
|
#else /* HAVE_STRUCT_SOCKADDR_SA_LEN */
|
|
#ifdef HAVE_STRUCT_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
|
|
|
|
#if (defined(linux) || defined(__Lynx__)) && defined(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_STRUCT_SOCKADDR_STORAGE */
|
|
#define SA_LEN(addr) (sizeof (struct sockaddr))
|
|
#endif /* HAVE_STRUCT_SOCKADDR_STORAGE */
|
|
#endif /* HAVE_STRUCT_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
|
|
* could be opened.
|
|
*/
|
|
int
|
|
pcap_findalldevs_interfaces(pcap_if_list_t *devlistp, char *errbuf,
|
|
int (*check_usable)(const char *), get_if_flags_func get_flags_func)
|
|
{
|
|
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, so, if a platform has interfaces
|
|
* with no interfaces on which traffic can be captured,
|
|
* we must check for those interfaces as well (see, for
|
|
* example, what's done on Linux).
|
|
*
|
|
* 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) {
|
|
pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
|
|
errno, "getifaddrs");
|
|
return (-1);
|
|
}
|
|
for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) {
|
|
/*
|
|
* 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 (PCAP_ISDIGIT(*q))
|
|
q++;
|
|
if (*q == '\0') {
|
|
/*
|
|
* All digits after the ":" until the end.
|
|
* Strip off the ":" and everything after
|
|
* it.
|
|
*/
|
|
*p = '\0';
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Can we capture on this device?
|
|
*/
|
|
if (!(*check_usable)(ifa->ifa_name)) {
|
|
/*
|
|
* No.
|
|
*/
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* "ifa_addr" was apparently null on at least one
|
|
* interface on some system. Therefore, we supply
|
|
* the address and netmask only if "ifa_addr" is
|
|
* non-null (if there's no address, there's obviously
|
|
* no netmask).
|
|
*/
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* Note that, on some platforms, ifa_broadaddr and
|
|
* ifa_dstaddr could be the same field (true on at
|
|
* least some versions of *BSD and macOS), so we
|
|
* can't just check whether the broadcast address
|
|
* is null and add it if so and check whether the
|
|
* destination address is null and add it if so.
|
|
*
|
|
* Therefore, we must also check the IFF_BROADCAST
|
|
* flag, and only add a broadcast address if it's
|
|
* set, and check the IFF_POINTTOPOINT flag, and
|
|
* only add a destination address if it's set (as
|
|
* per man page recommendations on some of those
|
|
* platforms).
|
|
*/
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* Add information for this address to the list.
|
|
*/
|
|
if (add_addr_to_if(devlistp, ifa->ifa_name, ifa->ifa_flags,
|
|
get_flags_func,
|
|
addr, addr_size, netmask, addr_size,
|
|
broadaddr, broadaddr_size, dstaddr, dstaddr_size,
|
|
errbuf) < 0) {
|
|
ret = -1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
freeifaddrs(ifap);
|
|
|
|
return (ret);
|
|
}
|