579 lines
16 KiB
C
579 lines
16 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.
|
|
*/
|
|
|
|
#ifndef lint
|
|
static const char rcsid[] _U_ =
|
|
"@(#) $Header: /tcpdump/master/libpcap/fad-gifc.c,v 1.8.2.2 2005/06/29 06:43:31 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
|
|
|
|
/*
|
|
* 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).
|
|
*
|
|
* We assume that a UNIX that doesn't have "getifaddrs()" and doesn't have
|
|
* SIOCGLIFCONF, but has SIOCGIFCONF, uses "struct sockaddr" for the
|
|
* address in an entry returned by SIOCGIFCONF.
|
|
*/
|
|
#ifndef SA_LEN
|
|
#ifdef HAVE_SOCKADDR_SA_LEN
|
|
#define SA_LEN(addr) ((addr)->sa_len)
|
|
#else /* HAVE_SOCKADDR_SA_LEN */
|
|
#define SA_LEN(addr) (sizeof (struct sockaddr))
|
|
#endif /* HAVE_SOCKADDR_SA_LEN */
|
|
#endif /* SA_LEN */
|
|
|
|
/*
|
|
* This is also fun.
|
|
*
|
|
* There is no ioctl that returns the amount of space required for all
|
|
* the data that SIOCGIFCONF could return, and if a buffer is supplied
|
|
* that's not large enough for all the data SIOCGIFCONF could return,
|
|
* on at least some platforms it just returns the data that'd fit with
|
|
* no indication that there wasn't enough room for all the data, much
|
|
* less an indication of how much more room is required.
|
|
*
|
|
* The only way to ensure that we got all the data is to pass a buffer
|
|
* large enough that the amount of space in the buffer *not* filled in
|
|
* is greater than the largest possible entry.
|
|
*
|
|
* We assume that's "sizeof(ifreq.ifr_name)" plus 255, under the assumption
|
|
* that no address is more than 255 bytes (on systems where the "sa_len"
|
|
* field in a "struct sockaddr" is 1 byte, e.g. newer BSDs, that's the
|
|
* case, and addresses are unlikely to be bigger than that in any case).
|
|
*/
|
|
#define MAX_SA_LEN 255
|
|
|
|
#ifdef HAVE_PROC_NET_DEV
|
|
/*
|
|
* Get from "/proc/net/dev" all interfaces listed there; if they're
|
|
* already in the list of interfaces we have, that won't add another
|
|
* instance, but if they're not, that'll add them.
|
|
*
|
|
* We don't bother getting any addresses for them; it appears you can't
|
|
* use SIOCGIFADDR on Linux to get IPv6 addresses for interfaces, and,
|
|
* although some other types of addresses can be fetched with SIOCGIFADDR,
|
|
* we don't bother with them for now.
|
|
*
|
|
* We also don't fail if we couldn't open "/proc/net/dev"; we just leave
|
|
* the list of interfaces as is.
|
|
*/
|
|
static int
|
|
scan_proc_net_dev(pcap_if_t **devlistp, int fd, char *errbuf)
|
|
{
|
|
FILE *proc_net_f;
|
|
char linebuf[512];
|
|
int linenum;
|
|
unsigned char *p;
|
|
char name[512]; /* XXX - pick a size */
|
|
char *q, *saveq;
|
|
struct ifreq ifrflags;
|
|
int ret = 0;
|
|
|
|
proc_net_f = fopen("/proc/net/dev", "r");
|
|
if (proc_net_f == NULL)
|
|
return (0);
|
|
|
|
for (linenum = 1;
|
|
fgets(linebuf, sizeof linebuf, proc_net_f) != NULL; linenum++) {
|
|
/*
|
|
* Skip the first two lines - they're headers.
|
|
*/
|
|
if (linenum <= 2)
|
|
continue;
|
|
|
|
p = &linebuf[0];
|
|
|
|
/*
|
|
* Skip leading white space.
|
|
*/
|
|
while (*p != '\0' && isspace(*p))
|
|
p++;
|
|
if (*p == '\0' || *p == '\n')
|
|
continue; /* blank line */
|
|
|
|
/*
|
|
* Get the interface name.
|
|
*/
|
|
q = &name[0];
|
|
while (*p != '\0' && !isspace(*p)) {
|
|
if (*p == ':') {
|
|
/*
|
|
* This could be the separator between a
|
|
* name and an alias number, or it could be
|
|
* the separator between a name with no
|
|
* alias number and the next field.
|
|
*
|
|
* If there's a colon after digits, it
|
|
* separates the name and the alias number,
|
|
* otherwise it separates the name and the
|
|
* next field.
|
|
*/
|
|
saveq = q;
|
|
while (isdigit(*p))
|
|
*q++ = *p++;
|
|
if (*p != ':') {
|
|
/*
|
|
* That was the next field,
|
|
* not the alias number.
|
|
*/
|
|
q = saveq;
|
|
}
|
|
break;
|
|
} else
|
|
*q++ = *p++;
|
|
}
|
|
*q = '\0';
|
|
|
|
/*
|
|
* Get the flags for this interface, and skip it if
|
|
* it's not up.
|
|
*/
|
|
strncpy(ifrflags.ifr_name, name, sizeof(ifrflags.ifr_name));
|
|
if (ioctl(fd, SIOCGIFFLAGS, (char *)&ifrflags) < 0) {
|
|
if (errno == ENXIO)
|
|
continue;
|
|
(void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
|
|
"SIOCGIFFLAGS: %.*s: %s",
|
|
(int)sizeof(ifrflags.ifr_name),
|
|
ifrflags.ifr_name,
|
|
pcap_strerror(errno));
|
|
ret = -1;
|
|
break;
|
|
}
|
|
if (!(ifrflags.ifr_flags & IFF_UP))
|
|
continue;
|
|
|
|
/*
|
|
* Add an entry for this interface, with no addresses.
|
|
*/
|
|
if (pcap_add_if(devlistp, name, ifrflags.ifr_flags, NULL,
|
|
errbuf) == -1) {
|
|
/*
|
|
* Failure.
|
|
*/
|
|
ret = -1;
|
|
break;
|
|
}
|
|
}
|
|
if (ret != -1) {
|
|
/*
|
|
* Well, we didn't fail for any other reason; did we
|
|
* fail due to an error reading the file?
|
|
*/
|
|
if (ferror(proc_net_f)) {
|
|
(void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
|
|
"Error reading /proc/net/dev: %s",
|
|
pcap_strerror(errno));
|
|
ret = -1;
|
|
}
|
|
}
|
|
|
|
(void)fclose(proc_net_f);
|
|
return (ret);
|
|
}
|
|
#endif /* HAVE_PROC_NET_DEV */
|
|
|
|
/*
|
|
* 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 SIOCGIFCONF but
|
|
* don't have any other mechanism for getting a list of interfaces.
|
|
*
|
|
* XXX - or platforms that have other, better mechanisms but for which
|
|
* we don't yet have code to use that mechanism; I think there's a better
|
|
* way on Linux, for example.
|
|
*/
|
|
int
|
|
pcap_findalldevs(pcap_if_t **alldevsp, char *errbuf)
|
|
{
|
|
pcap_if_t *devlist = NULL;
|
|
register int fd;
|
|
register struct ifreq *ifrp, *ifend, *ifnext;
|
|
int n;
|
|
struct ifconf ifc;
|
|
char *buf = NULL;
|
|
unsigned buf_size;
|
|
#if defined (HAVE_SOLARIS) || defined (HAVE_HPUX10_20_OR_LATER)
|
|
char *p, *q;
|
|
#endif
|
|
struct ifreq ifrflags, ifrnetmask, ifrbroadaddr, ifrdstaddr;
|
|
struct sockaddr *netmask, *broadaddr, *dstaddr;
|
|
size_t netmask_size, broadaddr_size, dstaddr_size;
|
|
int ret = 0;
|
|
|
|
/*
|
|
* Create a socket from which to fetch the list of interfaces.
|
|
*/
|
|
fd = socket(AF_INET, SOCK_DGRAM, 0);
|
|
if (fd < 0) {
|
|
(void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
|
|
"socket: %s", pcap_strerror(errno));
|
|
return (-1);
|
|
}
|
|
|
|
/*
|
|
* Start with an 8K buffer, and keep growing the buffer until
|
|
* we have more than "sizeof(ifrp->ifr_name) + MAX_SA_LEN"
|
|
* bytes left over in the buffer or we fail to get the
|
|
* interface list for some reason other than EINVAL (which is
|
|
* presumed here to mean "buffer is too small").
|
|
*/
|
|
buf_size = 8192;
|
|
for (;;) {
|
|
buf = malloc(buf_size);
|
|
if (buf == NULL) {
|
|
(void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
|
|
"malloc: %s", pcap_strerror(errno));
|
|
(void)close(fd);
|
|
return (-1);
|
|
}
|
|
|
|
ifc.ifc_len = buf_size;
|
|
ifc.ifc_buf = buf;
|
|
memset(buf, 0, buf_size);
|
|
if (ioctl(fd, SIOCGIFCONF, (char *)&ifc) < 0
|
|
&& errno != EINVAL) {
|
|
(void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
|
|
"SIOCGIFCONF: %s", pcap_strerror(errno));
|
|
(void)close(fd);
|
|
free(buf);
|
|
return (-1);
|
|
}
|
|
if (ifc.ifc_len < buf_size &&
|
|
(buf_size - ifc.ifc_len) > sizeof(ifrp->ifr_name) + MAX_SA_LEN)
|
|
break;
|
|
free(buf);
|
|
buf_size *= 2;
|
|
}
|
|
|
|
ifrp = (struct ifreq *)buf;
|
|
ifend = (struct ifreq *)(buf + ifc.ifc_len);
|
|
|
|
for (; ifrp < ifend; ifrp = ifnext) {
|
|
/*
|
|
* XXX - what if this isn't an IPv4 address? Can
|
|
* we still get the netmask, etc. with ioctls on
|
|
* an IPv4 socket?
|
|
*
|
|
* The answer is probably platform-dependent, and
|
|
* if the answer is "no" on more than one platform,
|
|
* the way you work around it is probably platform-
|
|
* dependent as well.
|
|
*/
|
|
n = SA_LEN(&ifrp->ifr_addr) + sizeof(ifrp->ifr_name);
|
|
if (n < sizeof(*ifrp))
|
|
ifnext = ifrp + 1;
|
|
else
|
|
ifnext = (struct ifreq *)((char *)ifrp + n);
|
|
|
|
/*
|
|
* XXX - The 32-bit compatibility layer for Linux on IA-64
|
|
* is slightly broken. It correctly converts the structures
|
|
* to and from kernel land from 64 bit to 32 bit but
|
|
* doesn't update ifc.ifc_len, leaving it larger than the
|
|
* amount really used. This means we read off the end
|
|
* of the buffer and encounter an interface with an
|
|
* "empty" name. Since this is highly unlikely to ever
|
|
* occur in a valid case we can just finish looking for
|
|
* interfaces if we see an empty name.
|
|
*/
|
|
if (!(*ifrp->ifr_name))
|
|
break;
|
|
|
|
/*
|
|
* 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->ifr_name, "dummy", 5) == 0)
|
|
continue;
|
|
|
|
/*
|
|
* Get the flags for this interface, and skip it if it's
|
|
* not up.
|
|
*/
|
|
strncpy(ifrflags.ifr_name, ifrp->ifr_name,
|
|
sizeof(ifrflags.ifr_name));
|
|
if (ioctl(fd, SIOCGIFFLAGS, (char *)&ifrflags) < 0) {
|
|
if (errno == ENXIO)
|
|
continue;
|
|
(void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
|
|
"SIOCGIFFLAGS: %.*s: %s",
|
|
(int)sizeof(ifrflags.ifr_name),
|
|
ifrflags.ifr_name,
|
|
pcap_strerror(errno));
|
|
ret = -1;
|
|
break;
|
|
}
|
|
if (!(ifrflags.ifr_flags & IFF_UP))
|
|
continue;
|
|
|
|
/*
|
|
* Get the netmask for this address on this interface.
|
|
*/
|
|
strncpy(ifrnetmask.ifr_name, ifrp->ifr_name,
|
|
sizeof(ifrnetmask.ifr_name));
|
|
memcpy(&ifrnetmask.ifr_addr, &ifrp->ifr_addr,
|
|
sizeof(ifrnetmask.ifr_addr));
|
|
if (ioctl(fd, SIOCGIFNETMASK, (char *)&ifrnetmask) < 0) {
|
|
if (errno == EADDRNOTAVAIL) {
|
|
/*
|
|
* Not available.
|
|
*/
|
|
netmask = NULL;
|
|
netmask_size = 0;
|
|
} else {
|
|
(void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
|
|
"SIOCGIFNETMASK: %.*s: %s",
|
|
(int)sizeof(ifrnetmask.ifr_name),
|
|
ifrnetmask.ifr_name,
|
|
pcap_strerror(errno));
|
|
ret = -1;
|
|
break;
|
|
}
|
|
} else {
|
|
netmask = &ifrnetmask.ifr_addr;
|
|
netmask_size = SA_LEN(netmask);
|
|
}
|
|
|
|
/*
|
|
* Get the broadcast address for this address on this
|
|
* interface (if any).
|
|
*/
|
|
if (ifrflags.ifr_flags & IFF_BROADCAST) {
|
|
strncpy(ifrbroadaddr.ifr_name, ifrp->ifr_name,
|
|
sizeof(ifrbroadaddr.ifr_name));
|
|
memcpy(&ifrbroadaddr.ifr_addr, &ifrp->ifr_addr,
|
|
sizeof(ifrbroadaddr.ifr_addr));
|
|
if (ioctl(fd, SIOCGIFBRDADDR,
|
|
(char *)&ifrbroadaddr) < 0) {
|
|
if (errno == EADDRNOTAVAIL) {
|
|
/*
|
|
* Not available.
|
|
*/
|
|
broadaddr = NULL;
|
|
broadaddr_size = 0;
|
|
} else {
|
|
(void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
|
|
"SIOCGIFBRDADDR: %.*s: %s",
|
|
(int)sizeof(ifrbroadaddr.ifr_name),
|
|
ifrbroadaddr.ifr_name,
|
|
pcap_strerror(errno));
|
|
ret = -1;
|
|
break;
|
|
}
|
|
} else {
|
|
broadaddr = &ifrbroadaddr.ifr_broadaddr;
|
|
broadaddr_size = SA_LEN(broadaddr);
|
|
}
|
|
} else {
|
|
/*
|
|
* Not a broadcast interface, so no broadcast
|
|
* address.
|
|
*/
|
|
broadaddr = NULL;
|
|
broadaddr_size = 0;
|
|
}
|
|
|
|
/*
|
|
* Get the destination address for this address on this
|
|
* interface (if any).
|
|
*/
|
|
if (ifrflags.ifr_flags & IFF_POINTOPOINT) {
|
|
strncpy(ifrdstaddr.ifr_name, ifrp->ifr_name,
|
|
sizeof(ifrdstaddr.ifr_name));
|
|
memcpy(&ifrdstaddr.ifr_addr, &ifrp->ifr_addr,
|
|
sizeof(ifrdstaddr.ifr_addr));
|
|
if (ioctl(fd, SIOCGIFDSTADDR,
|
|
(char *)&ifrdstaddr) < 0) {
|
|
if (errno == EADDRNOTAVAIL) {
|
|
/*
|
|
* Not available.
|
|
*/
|
|
dstaddr = NULL;
|
|
dstaddr_size = 0;
|
|
} else {
|
|
(void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
|
|
"SIOCGIFDSTADDR: %.*s: %s",
|
|
(int)sizeof(ifrdstaddr.ifr_name),
|
|
ifrdstaddr.ifr_name,
|
|
pcap_strerror(errno));
|
|
ret = -1;
|
|
break;
|
|
}
|
|
} else {
|
|
dstaddr = &ifrdstaddr.ifr_dstaddr;
|
|
dstaddr_size = SA_LEN(dstaddr);
|
|
}
|
|
} else {
|
|
/*
|
|
* Not a point-to-point interface, so no destination
|
|
* address.
|
|
*/
|
|
dstaddr = NULL;
|
|
dstaddr_size = 0;
|
|
}
|
|
|
|
#if defined (HAVE_SOLARIS) || defined (HAVE_HPUX10_20_OR_LATER)
|
|
/*
|
|
* 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->ifr_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->ifr_name,
|
|
ifrflags.ifr_flags, &ifrp->ifr_addr,
|
|
SA_LEN(&ifrp->ifr_addr), netmask, netmask_size,
|
|
broadaddr, broadaddr_size, dstaddr, dstaddr_size,
|
|
errbuf) < 0) {
|
|
ret = -1;
|
|
break;
|
|
}
|
|
}
|
|
free(buf);
|
|
|
|
#ifdef HAVE_PROC_NET_DEV
|
|
if (ret != -1) {
|
|
/*
|
|
* We haven't had any errors yet; now read "/proc/net/dev",
|
|
* and add to the list of interfaces all interfaces listed
|
|
* there that we don't already have, because, on Linux,
|
|
* SIOCGIFCONF reports only interfaces with IPv4 addresses,
|
|
* so you need to read "/proc/net/dev" to get the names of
|
|
* the rest of the interfaces.
|
|
*/
|
|
ret = scan_proc_net_dev(&devlist, fd, errbuf);
|
|
}
|
|
#endif
|
|
(void)close(fd);
|
|
|
|
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);
|
|
}
|