![Guy Harris](/assets/img/avatar_default.png)
as an argument, and, on an error, if they have an error message, have them set that "gchar *" to point to a g_malloc()ed string containing the error message, rather than taking a pointer to a buffer for that message as an argument. That's more like what's done in Wiretap, and doesn't impose an upper limit on the lengths of those error messages. If that pointer is null, don't allocate the message string and return it. Have that error message already have the "cant_get" processing applied to it, so nobody other than those routines need to call the "cant_get" routines to process the error messages. Have get_airpcap_interface_list() explicitly set "*err" to the appropriate error code. Clean up indentation. svn path=/trunk/; revision=20521
350 lines
8.4 KiB
C
350 lines
8.4 KiB
C
/* capture-pcap-util-unix.c
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* UN*X-specific utility routines for packet capture
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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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 <glib.h>
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#ifdef HAVE_LIBPCAP
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <errno.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_SYS_SOCKET_H
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#include <sys/socket.h>
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#endif
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#ifdef HAVE_SYS_IOCTL_H
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#include <sys/ioctl.h>
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#endif
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#include <pcap.h>
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/*
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* Keep Digital UNIX happy when including <net/if.h>.
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*/
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struct mbuf;
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struct rtentry;
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#include <net/if.h>
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#ifdef HAVE_SYS_SOCKIO_H
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# include <sys/sockio.h>
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#endif
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#include "capture-pcap-util.h"
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#include "capture-pcap-util-int.h"
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#ifndef HAVE_PCAP_FINDALLDEVS
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struct search_user_data {
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char *name;
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if_info_t *if_info;
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};
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static void
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search_for_if_cb(gpointer data, gpointer user_data);
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#endif
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GList *
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get_interface_list(int *err, char **err_str)
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{
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#ifdef HAVE_PCAP_FINDALLDEVS
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return get_interface_list_findalldevs(err, err_str);
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#else
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GList *il = NULL;
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gint nonloopback_pos = 0;
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struct ifreq *ifr, *last;
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struct ifconf ifc;
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struct ifreq ifrflags;
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int sock = socket(AF_INET, SOCK_DGRAM, 0);
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struct search_user_data user_data;
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pcap_t *pch;
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int len, lastlen;
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char *buf;
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if_info_t *if_info;
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char errbuf[PCAP_ERRBUF_SIZE];
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if (sock < 0) {
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*err = CANT_GET_INTERFACE_LIST;
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if (err_str != NULL) {
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*err_str = g_strdup_printf(
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"Can't get list of interfaces: error opening socket: %s",
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strerror(errno));
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}
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return NULL;
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}
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/*
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* This code came from: W. Richard Stevens: "UNIX Network Programming",
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* Networking APIs: Sockets and XTI, Vol 1, page 434.
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*/
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lastlen = 0;
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len = 100 * sizeof(struct ifreq);
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for ( ; ; ) {
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buf = g_malloc(len);
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ifc.ifc_len = len;
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ifc.ifc_buf = buf;
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memset (buf, 0, len);
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if (ioctl(sock, SIOCGIFCONF, &ifc) < 0) {
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if (errno != EINVAL || lastlen != 0) {
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if (err_str != NULL) {
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*err_str = g_strdup_printf(
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"Can't get list of interfaces: SIOCGIFCONF ioctl error: %s",
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strerror(errno));
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}
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goto fail;
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}
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} else {
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if ((unsigned) ifc.ifc_len < sizeof(struct ifreq)) {
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if (err_str != NULL) {
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*err_str = g_strdup(
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"Can't get list of interfaces: SIOCGIFCONF ioctl gave too small return buffer");
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}
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goto fail;
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}
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if (ifc.ifc_len == lastlen)
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break; /* success, len has not changed */
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lastlen = ifc.ifc_len;
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}
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len += 10 * sizeof(struct ifreq); /* increment */
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g_free(buf);
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}
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ifr = (struct ifreq *) ifc.ifc_req;
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last = (struct ifreq *) ((char *) ifr + ifc.ifc_len);
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while (ifr < last) {
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/*
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* Skip entries that begin with "dummy", or that include
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* a ":" (the latter are Solaris virtuals).
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*/
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if (strncmp(ifr->ifr_name, "dummy", 5) == 0 ||
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strchr(ifr->ifr_name, ':') != NULL)
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goto next;
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/*
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* If we already have this interface name on the list,
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* don't add it, but, if we don't already have an IP
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* address for it, add that address (SIOCGIFCONF returns,
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* at least on BSD-flavored systems, one entry per
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* interface *address*; if an interface has multiple
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* addresses, we get multiple entries for it).
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*/
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user_data.name = ifr->ifr_name;
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user_data.if_info = NULL;
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g_list_foreach(il, search_for_if_cb, &user_data);
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if (user_data.if_info != NULL) {
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if_info_add_address(user_data.if_info, &ifr->ifr_addr);
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goto next;
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}
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/*
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* Get the interface flags.
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*/
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memset(&ifrflags, 0, sizeof ifrflags);
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strncpy(ifrflags.ifr_name, ifr->ifr_name,
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sizeof ifrflags.ifr_name);
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if (ioctl(sock, SIOCGIFFLAGS, (char *)&ifrflags) < 0) {
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if (errno == ENXIO)
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goto next;
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if (err_str != NULL) {
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*err_str = g_strdup_printf(
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"Can't get list of interfaces: SIOCGIFFLAGS error getting flags for interface %s: %s",
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ifr->ifr_name, strerror(errno));
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}
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goto fail;
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}
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/*
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* Skip interfaces that aren't up.
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*/
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if (!(ifrflags.ifr_flags & IFF_UP))
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goto next;
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/*
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* Skip interfaces that we can't open with "libpcap".
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* Open with the minimum packet size - it appears that the
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* IRIX SIOCSNOOPLEN "ioctl" may fail if the capture length
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* supplied is too large, rather than just truncating it.
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*/
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pch = pcap_open_live(ifr->ifr_name, MIN_PACKET_SIZE, 0, 0,
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errbuf);
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if (pch == NULL)
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goto next;
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pcap_close(pch);
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/*
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* If it's a loopback interface, add it at the end of the
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* list, otherwise add it after the last non-loopback
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* interface, so all loopback interfaces go at the end - we
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* don't want a loopback interface to be the default capture
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* device unless there are no non-loopback devices.
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*/
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if_info = if_info_new(ifr->ifr_name, NULL);
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if_info_add_address(if_info, &ifr->ifr_addr);
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if ((ifrflags.ifr_flags & IFF_LOOPBACK) ||
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strncmp(ifr->ifr_name, "lo", 2) == 0) {
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if_info->loopback = TRUE;
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il = g_list_append(il, if_info);
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} else {
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if_info->loopback = FALSE;
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il = g_list_insert(il, if_info, nonloopback_pos);
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/*
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* Insert the next non-loopback interface after this
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* one.
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*/
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nonloopback_pos++;
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}
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next:
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#ifdef HAVE_SA_LEN
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ifr = (struct ifreq *) ((char *) ifr +
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(ifr->ifr_addr.sa_len > sizeof(ifr->ifr_addr) ?
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ifr->ifr_addr.sa_len : sizeof(ifr->ifr_addr)) +
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IFNAMSIZ);
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#else
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ifr = (struct ifreq *) ((char *) ifr + sizeof(struct ifreq));
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#endif
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}
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#ifdef linux
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/*
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* OK, maybe we have support for the "any" device, to do a cooked
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* capture on all interfaces at once.
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* Try opening it and, if that succeeds, add it to the end of
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* the list of interfaces.
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*/
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pch = pcap_open_live("any", MIN_PACKET_SIZE, 0, 0, errbuf);
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if (pch != NULL) {
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/*
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* It worked; we can use the "any" device.
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*/
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if_info = if_info_new("any",
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"Pseudo-device that captures on all interfaces");
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il = g_list_insert(il, if_info, -1);
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pcap_close(pch);
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}
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#endif
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g_free(ifc.ifc_buf);
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close(sock);
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if (il == NULL) {
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/*
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* No interfaces found.
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*/
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*err = NO_INTERFACES_FOUND;
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if (err_str != NULL)
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*err_str = NULL;
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}
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return il;
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fail:
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if (il != NULL)
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free_interface_list(il);
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g_free(ifc.ifc_buf);
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close(sock);
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*err = CANT_GET_INTERFACE_LIST;
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return NULL;
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#endif /* HAVE_PCAP_FINDALLDEVS */
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}
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#ifndef HAVE_PCAP_FINDALLDEVS
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static void
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search_for_if_cb(gpointer data, gpointer user_data)
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{
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struct search_user_data *search_user_data = user_data;
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if_info_t *if_info = data;
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if (strcmp(if_info->name, search_user_data->name) == 0)
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search_user_data->if_info = if_info;
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}
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#endif /* HAVE_PCAP_FINDALLDEVS */
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/*
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* Get an error message string for a CANT_GET_INTERFACE_LIST error from
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* "get_interface_list()".
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*/
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gchar *
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cant_get_if_list_error_message(const char *err_str)
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{
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return g_strdup_printf("Can't get list of interfaces: %s", err_str);
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}
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/*
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* Append the version of libpcap with which we were compiled to a GString.
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*/
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void
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get_compiled_pcap_version(GString *str)
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{
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#ifdef HAVE_PCAP_VERSION
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extern char pcap_version[];
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g_string_sprintfa(str, "with libpcap %s", pcap_version);
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#else
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g_string_append(str, "with libpcap (version unknown)");
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#endif
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}
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/*
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* Append the version of libpcap with which we we're running to a GString.
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*/
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void
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get_runtime_pcap_version(GString *str)
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{
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g_string_sprintfa(str, "with ");
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#ifdef HAVE_PCAP_LIB_VERSION
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g_string_sprintfa(str, pcap_lib_version());
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#else
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g_string_append(str, "libpcap (version unknown)");
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#endif
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}
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#else /* HAVE_LIBPCAP */
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/*
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* Append an indication that we were not compiled with libpcap
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* to a GString.
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*/
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void
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get_compiled_pcap_version(GString *str)
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{
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g_string_append(str, "without libpcap");
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}
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/*
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* Don't append anything, as we weren't even compiled to use WinPcap.
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*/
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void
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get_runtime_pcap_version(GString *str _U_)
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{
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}
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#endif /* HAVE_LIBPCAP */
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