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/* -*- 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 1.5.2.1 2005/04/19 00:54:16 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 SIOCLGIFCONF
* but don't have "getifaddrs()". (Solaris 8 and later; we use
* SIOCLGIFCONF 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);
}
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