281 lines
8.6 KiB
C
281 lines
8.6 KiB
C
/* -*- Mode: c; tab-width: 8; indent-tabs-mode: 1; c-basic-offset: 8; -*- */
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/*
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* Copyright (c) 1994, 1995, 1996, 1997, 1998
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the Computer Systems
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* Engineering Group at Lawrence Berkeley Laboratory.
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* 4. Neither the name of the University nor of the Laboratory may be used
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* to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <net/if.h>
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#include <ctype.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ifaddrs.h>
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#include "pcap-int.h"
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#ifdef HAVE_OS_PROTO_H
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#include "os-proto.h"
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#endif
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/*
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* We don't do this on Solaris 11 and later, as it appears there aren't
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* any AF_PACKET addresses on interfaces, so we don't need this, and
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* we end up including both the OS's <net/bpf.h> and our <pcap/bpf.h>,
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* and their definitions of some data structures collide.
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*/
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#if (defined(linux) || defined(__Lynx__)) && defined(AF_PACKET)
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# ifdef HAVE_NETPACKET_PACKET_H
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/* Linux distributions with newer glibc */
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# include <netpacket/packet.h>
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# else /* HAVE_NETPACKET_PACKET_H */
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/* LynxOS, Linux distributions with older glibc */
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# ifdef __Lynx__
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/* LynxOS */
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# include <netpacket/if_packet.h>
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# else /* __Lynx__ */
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/* Linux */
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# include <linux/types.h>
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# include <linux/if_packet.h>
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# endif /* __Lynx__ */
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# endif /* HAVE_NETPACKET_PACKET_H */
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#endif /* (defined(linux) || defined(__Lynx__)) && defined(AF_PACKET) */
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/*
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* This is fun.
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*
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* In older BSD systems, socket addresses were fixed-length, and
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* "sizeof (struct sockaddr)" gave the size of the structure.
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* All addresses fit within a "struct sockaddr".
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*
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* In newer BSD systems, the socket address is variable-length, and
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* there's an "sa_len" field giving the length of the structure;
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* this allows socket addresses to be longer than 2 bytes of family
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* and 14 bytes of data.
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*
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* Some commercial UNIXes use the old BSD scheme, some use the RFC 2553
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* variant of the old BSD scheme (with "struct sockaddr_storage" rather
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* than "struct sockaddr"), and some use the new BSD scheme.
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*
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* Some versions of GNU libc use neither scheme, but has an "SA_LEN()"
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* macro that determines the size based on the address family. Other
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* versions don't have "SA_LEN()" (as it was in drafts of RFC 2553
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* but not in the final version). On the latter systems, we explicitly
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* check the AF_ type to determine the length; we assume that on
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* all those systems we have "struct sockaddr_storage".
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*/
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#ifndef SA_LEN
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#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
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#define SA_LEN(addr) ((addr)->sa_len)
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#else /* HAVE_STRUCT_SOCKADDR_SA_LEN */
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#ifdef HAVE_STRUCT_SOCKADDR_STORAGE
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static size_t
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get_sa_len(struct sockaddr *addr)
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{
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switch (addr->sa_family) {
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#ifdef AF_INET
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case AF_INET:
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return (sizeof (struct sockaddr_in));
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#endif
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#ifdef AF_INET6
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case AF_INET6:
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return (sizeof (struct sockaddr_in6));
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#endif
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#if (defined(linux) || defined(__Lynx__)) && defined(AF_PACKET)
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case AF_PACKET:
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return (sizeof (struct sockaddr_ll));
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#endif
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default:
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return (sizeof (struct sockaddr));
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}
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}
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#define SA_LEN(addr) (get_sa_len(addr))
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#else /* HAVE_STRUCT_SOCKADDR_STORAGE */
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#define SA_LEN(addr) (sizeof (struct sockaddr))
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#endif /* HAVE_STRUCT_SOCKADDR_STORAGE */
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#endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */
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#endif /* SA_LEN */
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/*
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* Get a list of all interfaces that are up and that we can open.
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* Returns -1 on error, 0 otherwise.
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* The list, as returned through "alldevsp", may be null if no interfaces
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* could be opened.
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*/
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int
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pcap_findalldevs_interfaces(pcap_if_list_t *devlistp, char *errbuf,
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int (*check_usable)(const char *), get_if_flags_func get_flags_func)
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{
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struct ifaddrs *ifap, *ifa;
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struct sockaddr *addr, *netmask, *broadaddr, *dstaddr;
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size_t addr_size, broadaddr_size, dstaddr_size;
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int ret = 0;
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char *p, *q;
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/*
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* Get the list of interface addresses.
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*
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* Note: this won't return information about interfaces
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* with no addresses, so, if a platform has interfaces
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* with no interfaces on which traffic can be captured,
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* we must check for those interfaces as well (see, for
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* example, what's done on Linux).
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*
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* LAN interfaces will probably have link-layer
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* addresses; I don't know whether all implementations
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* of "getifaddrs()" now, or in the future, will return
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* those.
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*/
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if (getifaddrs(&ifap) != 0) {
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pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
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errno, "getifaddrs");
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return (-1);
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}
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for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) {
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/*
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* If this entry has a colon followed by a number at
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* the end, we assume it's a logical interface. Those
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* are just the way you assign multiple IP addresses to
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* a real interface on Linux, so an entry for a logical
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* interface should be treated like the entry for the
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* real interface; we do that by stripping off the ":"
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* and the number.
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*
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* XXX - should we do this only on Linux?
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*/
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p = strchr(ifa->ifa_name, ':');
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if (p != NULL) {
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/*
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* We have a ":"; is it followed by a number?
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*/
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q = p + 1;
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while (isdigit((unsigned char)*q))
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q++;
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if (*q == '\0') {
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/*
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* All digits after the ":" until the end.
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* Strip off the ":" and everything after
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* it.
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*/
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*p = '\0';
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}
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}
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/*
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* Can we capture on this device?
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*/
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if (!(*check_usable)(ifa->ifa_name)) {
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/*
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* No.
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*/
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continue;
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}
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/*
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* "ifa_addr" was apparently null on at least one
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* interface on some system. Therefore, we supply
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* the address and netmask only if "ifa_addr" is
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* non-null (if there's no address, there's obviously
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* no netmask).
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*/
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if (ifa->ifa_addr != NULL) {
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addr = ifa->ifa_addr;
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addr_size = SA_LEN(addr);
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netmask = ifa->ifa_netmask;
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} else {
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addr = NULL;
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addr_size = 0;
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netmask = NULL;
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}
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/*
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* Note that, on some platforms, ifa_broadaddr and
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* ifa_dstaddr could be the same field (true on at
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* least some versions of *BSD and macOS), so we
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* can't just check whether the broadcast address
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* is null and add it if so and check whether the
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* destination address is null and add it if so.
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*
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* Therefore, we must also check the IFF_BROADCAST
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* flag, and only add a broadcast address if it's
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* set, and check the IFF_POINTTOPOINT flag, and
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* only add a destination address if it's set (as
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* per man page recommendations on some of those
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* platforms).
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*/
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if (ifa->ifa_flags & IFF_BROADCAST &&
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ifa->ifa_broadaddr != NULL) {
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broadaddr = ifa->ifa_broadaddr;
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broadaddr_size = SA_LEN(broadaddr);
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} else {
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broadaddr = NULL;
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broadaddr_size = 0;
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}
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if (ifa->ifa_flags & IFF_POINTOPOINT &&
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ifa->ifa_dstaddr != NULL) {
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dstaddr = ifa->ifa_dstaddr;
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dstaddr_size = SA_LEN(ifa->ifa_dstaddr);
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} else {
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dstaddr = NULL;
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dstaddr_size = 0;
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}
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/*
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* Add information for this address to the list.
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*/
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if (add_addr_to_if(devlistp, ifa->ifa_name, ifa->ifa_flags,
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get_flags_func,
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addr, addr_size, netmask, addr_size,
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broadaddr, broadaddr_size, dstaddr, dstaddr_size,
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errbuf) < 0) {
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ret = -1;
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break;
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}
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}
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freeifaddrs(ifap);
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return (ret);
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}
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