![Guy Harris](/assets/img/avatar_default.png)
Have a header file that defines HAVE_REMOTE if HAVE_PCAP_REMOTE is defined, and then includes pcap.h. Replace all other includes of pcap.h, and the definition of HAVE_REMOTE, with includes of that file. Check for anything other than wspcap.h including pcap.h in checkAPIs.pl. Change-Id: I3cbee8208944ad6f006f568b3fe3134e10b2a883 Reviewed-on: https://code.wireshark.org/review/21605 Reviewed-by: Guy Harris <guy@alum.mit.edu>
580 lines
15 KiB
C
580 lines
15 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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* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <glib.h>
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#ifdef HAVE_LIBPCAP
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#include <wsutil/wspcap.h>
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#ifdef __APPLE__
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#include <dlfcn.h>
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#endif
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#ifndef HAVE_PCAP_FINDALLDEVS
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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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/*
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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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#endif /* HAVE_PCAP_FINDALLDEVS */
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#ifdef HAVE_LIBCAP
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# include <sys/capability.h>
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#endif
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#include "caputils/capture_ifinfo.h"
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#include "caputils/capture-pcap-util.h"
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#include "caputils/capture-pcap-util-int.h"
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#ifdef HAVE_PCAP_REMOTE
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GList *
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get_remote_interface_list(const char *hostname, const char *port,
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int auth_type, const char *username,
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const char *passwd, int *err, char **err_str)
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{
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struct pcap_rmtauth auth;
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char source[PCAP_BUF_SIZE];
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char errbuf[PCAP_ERRBUF_SIZE];
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GList *result;
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if (pcap_createsrcstr(source, PCAP_SRC_IFREMOTE, hostname, port,
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NULL, errbuf) == -1) {
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*err = CANT_GET_INTERFACE_LIST;
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if (err_str != NULL)
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*err_str = cant_get_if_list_error_message(errbuf);
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return NULL;
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}
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auth.type = auth_type;
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auth.username = g_strdup(username);
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auth.password = g_strdup(passwd);
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result = get_interface_list_findalldevs_ex(source, &auth, err, err_str);
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g_free(auth.username);
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g_free(auth.password);
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return result;
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}
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#endif
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#ifdef HAVE_PCAP_FINDALLDEVS
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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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return get_interface_list_findalldevs(err, err_str);
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}
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#else /* 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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{
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struct search_user_data *search_user_data = (struct search_user_data*)user_data;
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if_info_t *if_info = (if_info_t *)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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GList *
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get_interface_list(int *err, char **err_str)
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{
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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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gboolean loopback;
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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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g_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 = (char *)g_malloc0(len);
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ifc.ifc_len = len;
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ifc.ifc_buf = buf;
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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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g_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 int) 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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if (user_data.if_info->addrs) {
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g_slist_reverse(user_data.if_info->addrs);
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}
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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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g_strlcpy(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, g_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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loopback = ((ifrflags.ifr_flags & IFF_LOOPBACK) ||
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strncmp(ifr->ifr_name, "lo", 2) == 0);
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if_info = if_info_new(ifr->ifr_name, NULL, loopback);
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if_info_add_address(if_info, &ifr->ifr_addr);
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if (if_info->addrs) {
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g_slist_reverse(if_info->addrs);
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}
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if (loopback)
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il = g_list_append(il, if_info);
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else {
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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_STRUCT_SOCKADDR_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", FALSE);
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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 = 0;
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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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}
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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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#ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
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/*
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* Request high-resolution time stamps.
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*
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* We don't check for errors - if this fails, we just live with boring old
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* microsecond-resolution time stamps. The only errors pcap_set_tstamp_precision()
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* is documenting as returning are PCAP_ERROR_TSTAMP_PRECISION_NOTSUP, which just
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* means we can't do nanosecond precision on this adapter, in which case we
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* just live with whatever resolution we get by default, and
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* PCAP_ERROR_ACTIVATED, which shouldn't happen as we shouldn't call this
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* after we've activated the pcap_t.
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*/
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void
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request_high_resolution_timestamp(pcap_t *pcap_h)
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{
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#ifdef __APPLE__
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/*
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* On macOS, if you build with a newer SDK, pcap_set_tstamp_precision()
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* is available, so the code will be built with it.
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*
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* However, if you then try to run on an older release that
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* doesn't have pcap_set_tstamp_precision(), the dynamic linker
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* will fail, as it won't find pcap_set_tstamp_precision().
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*
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* libpcap doesn't use macOS "weak linking" for new routines,
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* so we can't just check whether a pointer to
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* pcap_set_tstamp_precision() is null and, if it is, not
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* call it. We have to, instead, use dlopen() to load
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* libpcap, and dlsym() to find a pointer to pcap_set_tstamp_precision(),
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* and if we find the pointer, call it.
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*/
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static gboolean initialized = FALSE;
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static int (*p_pcap_set_tstamp_precision)(pcap_t *, int);
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if (!initialized) {
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p_pcap_set_tstamp_precision =
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(int (*)(pcap_t *, int))
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dlsym(RTLD_NEXT, "pcap_set_tstamp_precision");
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initialized = TRUE;
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}
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if (p_pcap_set_tstamp_precision != NULL)
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(*p_pcap_set_tstamp_precision)(pcap_h, PCAP_TSTAMP_PRECISION_NANO);
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#else /* __APPLE__ */
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/*
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* On other UN*Xes we require that we be run on an OS version
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* with a libpcap equal to or later than the version with which
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* we were built.
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*/
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pcap_set_tstamp_precision(pcap_h, PCAP_TSTAMP_PRECISION_NANO);
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#endif /* __APPLE__ */
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}
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/*
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* Return TRUE if the pcap_t in question is set up for high-precision
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* time stamps, FALSE otherwise.
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*/
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gboolean
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have_high_resolution_timestamp(pcap_t *pcap_h)
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{
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#ifdef __APPLE__
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/*
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* See above.
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*/
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static gboolean initialized = FALSE;
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static int (*p_pcap_get_tstamp_precision)(pcap_t *);
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if (!initialized) {
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p_pcap_get_tstamp_precision =
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(int (*)(pcap_t *))
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dlsym(RTLD_NEXT, "pcap_get_tstamp_precision");
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initialized = TRUE;
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}
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if (p_pcap_get_tstamp_precision != NULL)
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return (*p_pcap_get_tstamp_precision)(pcap_h) == PCAP_TSTAMP_PRECISION_NANO;
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else
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return FALSE; /* Can't get implies couldn't set */
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#else /* __APPLE__ */
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/*
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* On other UN*Xes we require that we be run on an OS version
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* with a libpcap equal to or later than the version with which
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* we were built.
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*/
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return pcap_get_tstamp_precision(pcap_h) == PCAP_TSTAMP_PRECISION_NANO;
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#endif /* __APPLE__ */
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}
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#endif /* HAVE_PCAP_SET_TSTAMP_PRECISION */
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if_capabilities_t *
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get_if_capabilities_local(interface_options *interface_opts, char **err_str)
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{
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#ifdef HAVE_PCAP_CREATE
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return get_if_capabilities_pcap_create(interface_opts, err_str);
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#else
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return get_if_capabilities_pcap_open_live(interface_opts, err_str);
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#endif
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}
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pcap_t *
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open_capture_device_local(capture_options *capture_opts
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#ifndef HAVE_PCAP_CREATE
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_U_
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#endif
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,
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interface_options *interface_opts, int timeout,
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char (*open_err_str)[PCAP_ERRBUF_SIZE])
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{
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/*
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* We're not opening a remote device; use pcap_create() and
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* pcap_activate() if we have them, so that we can set various
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* options, otherwise use pcap_open_live().
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*/
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#ifdef HAVE_PCAP_CREATE
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return open_capture_device_pcap_create(capture_opts,
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interface_opts, timeout, open_err_str);
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#else
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return open_capture_device_pcap_open_live(interface_opts, timeout,
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open_err_str);
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#endif
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}
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/*
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* Get the versions of libpcap, libpcap, and libnl with which we were
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* compiled, and append them to a GString.
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*/
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void
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get_compiled_caplibs_version(GString *str)
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{
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/*
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* NOTE: in *some* flavors of UN*X, the data from a shared
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* library might be linked into executable images that are
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* linked with that shared library, in which case you could
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* look at pcap_version[] to get the version with which
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* the program was compiled.
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*
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* In other flavors of UN*X, that doesn't happen, so
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* pcap_version[] gives you the version the program is
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* running with, not the version it was built with, and,
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* in at least some of them, if the length of a data item
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* referred to by the executable - such as the pcap_version[]
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* string - isn't the same in the version of the library
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* with which the program was built and the version with
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* which it was run, the run-time linker will complain,
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* which is Not Good.
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*
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* So, for now, we just give up on reporting the version
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* of libpcap with which we were compiled.
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*/
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g_string_append(str, "with libpcap");
|
|
#ifdef HAVE_PCAP_REMOTE
|
|
/*
|
|
* We have remote pcap support in libpcap.
|
|
*/
|
|
g_string_append(str, " (including remote capture support)");
|
|
#endif
|
|
|
|
/*
|
|
* XXX - these libraries are actually used only by dumpcap,
|
|
* but we mention them here so that a user reporting a bug
|
|
* can get information about dumpcap's libraries without
|
|
* having to run dumpcap.
|
|
*/
|
|
/* LIBCAP */
|
|
g_string_append(str, ", ");
|
|
#ifdef HAVE_LIBCAP
|
|
g_string_append(str, "with POSIX capabilities");
|
|
#ifdef _LINUX_CAPABILITY_VERSION
|
|
g_string_append(str, " (Linux)");
|
|
#endif /* _LINUX_CAPABILITY_VERSION */
|
|
#else /* HAVE_LIBCAP */
|
|
g_string_append(str, "without POSIX capabilities");
|
|
#endif /* HAVE_LIBCAP */
|
|
|
|
#ifdef __linux__
|
|
/* This is a Linux-specific library. */
|
|
/* LIBNL */
|
|
g_string_append(str, ", ");
|
|
#if defined(HAVE_LIBNL1)
|
|
g_string_append(str, "with libnl 1");
|
|
#elif defined(HAVE_LIBNL2)
|
|
g_string_append(str, "with libnl 2");
|
|
#elif defined(HAVE_LIBNL3)
|
|
g_string_append(str, "with libnl 3");
|
|
#else /* no libnl */
|
|
g_string_append(str, "without libnl");
|
|
#endif /* libnl version */
|
|
#endif /* __linux__ */
|
|
}
|
|
|
|
/*
|
|
* Append the version of libpcap with which we we're running to a GString.
|
|
*/
|
|
void
|
|
get_runtime_caplibs_version(GString *str)
|
|
{
|
|
g_string_append_printf(str, "with ");
|
|
#ifdef HAVE_PCAP_LIB_VERSION
|
|
g_string_append(str, pcap_lib_version());
|
|
#else
|
|
g_string_append(str, "libpcap (version unknown)");
|
|
#endif
|
|
}
|
|
|
|
#else /* HAVE_LIBPCAP */
|
|
|
|
/*
|
|
* Append an indication that we were not compiled with libpcap
|
|
* to a GString. Don't even bother mentioning the other
|
|
* libraries.
|
|
*/
|
|
void
|
|
get_compiled_caplibs_version(GString *str)
|
|
{
|
|
g_string_append(str, "without libpcap");
|
|
}
|
|
|
|
/*
|
|
* Don't append anything, as we weren't even compiled to use libpcap.
|
|
*/
|
|
void
|
|
get_runtime_caplibs_version(GString *str _U_)
|
|
{
|
|
}
|
|
|
|
#endif /* HAVE_LIBPCAP */
|
|
|
|
/*
|
|
* Editor modelines - http://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local variables:
|
|
* c-basic-offset: 8
|
|
* tab-width: 8
|
|
* indent-tabs-mode: t
|
|
* End:
|
|
*
|
|
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
|
|
* :indentSize=8:tabSize=8:noTabs=false:
|
|
*/
|