Use "pcap_findalldevs()" if present.

svn path=/trunk/; revision=8655

1 files changed, 273 insertions, 0 deletions

diff --git a/pcap-util-unix.c b/pcap-util-unix.c
new file mode 100644
index 0000000000..6e3e8676a9
--- /dev/null
+++ b/pcap-util-unix.c
@@ -0,0 +1,273 @@
+/* pcap-util-unix.c
+ * UN*X-specific utility routines for packet capture
+ *
+ * $Id: pcap-util-unix.c,v 1.1 2003/10/10 03:00:10 guy Exp $
+ *
+ * Ethereal - Network traffic analyzer
+ * By Gerald Combs <gerald@ethereal.com>
+ * Copyright 1998 Gerald Combs
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#ifdef HAVE_LIBPCAP
+
+#include <glib.h>
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <errno.h>
+
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#ifdef HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+
+#ifdef HAVE_SYS_IOCTL_H
+#include <sys/ioctl.h>
+#endif
+
+#include <pcap.h>
+
+/*
+ * Keep Digital UNIX happy when including <net/if.h>.
+ */
+struct mbuf;
+struct rtentry;
+#include <net/if.h>
+
+#ifdef HAVE_SYS_SOCKIO_H
+# include <sys/sockio.h>
+#endif
+
+#include "globals.h"
+
+#include "pcap-util.h"
+#include "pcap-util-int.h"
+
+#ifndef HAVE_PCAP_FINDALLDEVS
+struct search_user_data {
+	char	*name;
+	int	found;
+};
+
+static void
+search_for_if_cb(gpointer data, gpointer user_data);
+#endif
+
+GList *
+get_interface_list(int *err, char *err_str)
+{
+#ifdef HAVE_PCAP_FINDALLDEVS
+	return get_interface_list_findalldevs(err, err_str);
+#else
+	GList  *il = NULL;
+	gint    nonloopback_pos = 0;
+	struct  ifreq *ifr, *last;
+	struct  ifconf ifc;
+	struct  ifreq ifrflags;
+	int     sock = socket(AF_INET, SOCK_DGRAM, 0);
+	struct search_user_data user_data;
+	pcap_t *pch;
+	int len, lastlen;
+	char *buf;
+	if_info_t *if_info;
+
+	if (sock < 0) {
+		*err = CANT_GET_INTERFACE_LIST;
+		sprintf(err_str, "Error opening socket: %s",
+		    strerror(errno));
+		return NULL;
+	}
+
+	/*
+	 * This code came from: W. Richard Stevens: "UNIX Network Programming",
+	 * Networking APIs: Sockets and XTI, Vol 1, page 434.
+	 */
+	lastlen = 0;
+	len = 100 * sizeof(struct ifreq);
+	for ( ; ; ) {
+		buf = g_malloc(len);
+		ifc.ifc_len = len;
+		ifc.ifc_buf = buf;
+		memset (buf, 0, len);
+		if (ioctl(sock, SIOCGIFCONF, &ifc) < 0) {
+			if (errno != EINVAL || lastlen != 0) {
+				sprintf(err_str,
+					"SIOCGIFCONF ioctl error getting list of interfaces: %s",
+					strerror(errno));
+				goto fail;
+			}
+		} else {
+			if ((unsigned) ifc.ifc_len < sizeof(struct ifreq)) {
+				sprintf(err_str,
+					"SIOCGIFCONF ioctl gave too small return buffer");
+				goto fail;
+			}
+			if (ifc.ifc_len == lastlen)
+				break;			/* success, len has not changed */
+			lastlen = ifc.ifc_len;
+		}
+		len += 10 * sizeof(struct ifreq);	/* increment */
+		g_free(buf);
+	}
+	ifr = (struct ifreq *) ifc.ifc_req;
+	last = (struct ifreq *) ((char *) ifr + ifc.ifc_len);
+	while (ifr < last) {
+		/*
+		 * Skip addresses that begin with "dummy", or that include
+		 * a ":" (the latter are Solaris virtuals).
+		 */
+		if (strncmp(ifr->ifr_name, "dummy", 5) == 0 ||
+		    strchr(ifr->ifr_name, ':') != NULL)
+			goto next;
+
+		/*
+		 * If we already have this interface name on the list,
+		 * don't add it (SIOCGIFCONF returns, at least on
+		 * BSD-flavored systems, one entry per interface *address*;
+		 * if an interface has multiple addresses, we get multiple
+		 * entries for it).
+		 */
+		user_data.name = ifr->ifr_name;
+		user_data.found = FALSE;
+		g_list_foreach(il, search_for_if_cb, &user_data);
+		if (user_data.found)
+			goto next;
+
+		/*
+		 * Get the interface flags.
+		 */
+		memset(&ifrflags, 0, sizeof ifrflags);
+		strncpy(ifrflags.ifr_name, ifr->ifr_name,
+		    sizeof ifrflags.ifr_name);
+		if (ioctl(sock, SIOCGIFFLAGS, (char *)&ifrflags) < 0) {
+			if (errno == ENXIO)
+				goto next;
+			sprintf(err_str, "SIOCGIFFLAGS error getting flags for interface %s: %s",
+			    ifr->ifr_name, strerror(errno));
+			goto fail;
+		}
+
+		/*
+		 * Skip interfaces that aren't up.
+		 */
+		if (!(ifrflags.ifr_flags & IFF_UP))
+			goto next;
+
+		/*
+		 * Skip interfaces that we can't open with "libpcap".
+		 * Open with the minimum packet size - it appears that the
+		 * IRIX SIOCSNOOPLEN "ioctl" may fail if the capture length
+		 * supplied is too large, rather than just truncating it.
+		 */
+		pch = pcap_open_live(ifr->ifr_name, MIN_PACKET_SIZE, 0, 0,
+		    err_str);
+		if (pch == NULL)
+			goto next;
+		pcap_close(pch);
+
+		/*
+		 * If it's a loopback interface, add it at the end of the
+		 * list, otherwise add it after the last non-loopback
+		 * interface, so all loopback interfaces go at the end - we
+		 * don't want a loopback interface to be the default capture
+		 * device unless there are no non-loopback devices.
+		 */
+		if_info = if_info_new(ifr->ifr_name, NULL);
+		if ((ifrflags.ifr_flags & IFF_LOOPBACK) ||
+		    strncmp(ifr->ifr_name, "lo", 2) == 0)
+			il = g_list_append(il, if_info);
+		else {
+			il = g_list_insert(il, if_info, nonloopback_pos);
+			/*
+			 * Insert the next non-loopback interface after this
+			 * one.
+			 */
+			nonloopback_pos++;
+		}
+
+	next:
+#ifdef HAVE_SA_LEN
+		ifr = (struct ifreq *) ((char *) ifr +
+		    (ifr->ifr_addr.sa_len > sizeof(ifr->ifr_addr) ?
+			ifr->ifr_addr.sa_len : sizeof(ifr->ifr_addr)) +
+		    IFNAMSIZ);
+#else
+		ifr = (struct ifreq *) ((char *) ifr + sizeof(struct ifreq));
+#endif
+	}
+
+#ifdef linux
+	/*
+	 * OK, maybe we have support for the "any" device, to do a cooked
+	 * capture on all interfaces at once.
+	 * Try opening it and, if that succeeds, add it to the end of
+	 * the list of interfaces.
+	 */
+	pch = pcap_open_live("any", MIN_PACKET_SIZE, 0, 0, err_str);
+	if (pch != NULL) {
+		/*
+		 * It worked; we can use the "any" device.
+		 */
+		if_info = if_info_new("any",
+		    "Pseudo-device that captures on all interfaces");
+		il = g_list_insert(il, if_info, -1);
+		pcap_close(pch);
+	}
+#endif
+
+	g_free(ifc.ifc_buf);
+	close(sock);
+
+	if (il == NULL) {
+		/*
+		 * No interfaces found.
+		 */
+		*err = NO_INTERFACES_FOUND;
+	}
+	return il;
+
+fail:
+	if (il != NULL)
+		free_interface_list(il);
+	g_free(ifc.ifc_buf);
+	close(sock);
+	*err = CANT_GET_INTERFACE_LIST;
+	return NULL;
+#endif /* HAVE_PCAP_FINDALLDEVS */
+}
+
+#ifndef HAVE_PCAP_FINDALLDEVS
+static void
+search_for_if_cb(gpointer data, gpointer user_data)
+{
+	struct search_user_data *search_user_data = user_data;
+	if_info_t *if_info = data;
+
+	if (strcmp(if_info->name, search_user_data->name) == 0)
+		search_user_data->found = TRUE;
+}
+#endif /* HAVE_PCAP_FINDALLDEVS */
+
+#endif /* HAVE_LIBPCAP */