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/*
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* Copyright (c) 2012 Jakub Zawadzki
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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 <string.h>
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#include <time.h>
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#include <sys/time.h>
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#include <dbus/dbus.h>
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#include "pcap-int.h"
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#include "pcap-dbus.h"
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/*
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* Private data for capturing on D-Bus.
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*/
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struct pcap_dbus {
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DBusConnection *conn;
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u_int packets_read; /* count of packets read */
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};
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static int
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dbus_read(pcap_t *handle, int max_packets _U_, pcap_handler callback, u_char *user)
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{
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struct pcap_dbus *handlep = handle->priv;
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struct pcap_pkthdr pkth;
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DBusMessage *message;
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char *raw_msg;
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int raw_msg_len;
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int count = 0;
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message = dbus_connection_pop_message(handlep->conn);
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while (!message) {
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/* XXX handle->opt.timeout = timeout_ms; */
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if (!dbus_connection_read_write(handlep->conn, 100)) {
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pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Connection closed");
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return -1;
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}
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if (handle->break_loop) {
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handle->break_loop = 0;
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return -2;
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}
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message = dbus_connection_pop_message(handlep->conn);
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}
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if (dbus_message_is_signal(message, DBUS_INTERFACE_LOCAL, "Disconnected")) {
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pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Disconnected");
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return -1;
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}
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if (dbus_message_marshal(message, &raw_msg, &raw_msg_len)) {
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pkth.caplen = pkth.len = raw_msg_len;
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/* pkth.caplen = min (payload_len, handle->snapshot); */
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gettimeofday(&pkth.ts, NULL);
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if (handle->fcode.bf_insns == NULL ||
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bpf_filter(handle->fcode.bf_insns, (u_char *)raw_msg, pkth.len, pkth.caplen)) {
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handlep->packets_read++;
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callback(user, &pkth, (u_char *)raw_msg);
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count++;
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}
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dbus_free(raw_msg);
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}
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return count;
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}
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static int
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dbus_write(pcap_t *handle, const void *buf, size_t size)
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{
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/* XXX, not tested */
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struct pcap_dbus *handlep = handle->priv;
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DBusError error = DBUS_ERROR_INIT;
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DBusMessage *msg;
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if (!(msg = dbus_message_demarshal(buf, size, &error))) {
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pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "dbus_message_demarshal() failed: %s", error.message);
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dbus_error_free(&error);
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return -1;
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}
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dbus_connection_send(handlep->conn, msg, NULL);
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dbus_connection_flush(handlep->conn);
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dbus_message_unref(msg);
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return 0;
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}
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static int
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dbus_stats(pcap_t *handle, struct pcap_stat *stats)
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{
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struct pcap_dbus *handlep = handle->priv;
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stats->ps_recv = handlep->packets_read;
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stats->ps_drop = 0;
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stats->ps_ifdrop = 0;
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return 0;
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}
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static void
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dbus_cleanup(pcap_t *handle)
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{
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struct pcap_dbus *handlep = handle->priv;
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dbus_connection_unref(handlep->conn);
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pcap_cleanup_live_common(handle);
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}
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/*
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* We don't support non-blocking mode. I'm not sure what we'd
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* do to support it and, given that we don't support select()/
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* poll()/epoll_wait()/kevent() etc., it probably doesn't
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* matter.
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*/
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static int
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dbus_getnonblock(pcap_t *p)
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{
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pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
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"Non-blocking mode isn't supported for capturing on D-Bus");
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return (-1);
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}
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static int
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dbus_setnonblock(pcap_t *p, int nonblock _U_)
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{
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pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
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"Non-blocking mode isn't supported for capturing on D-Bus");
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return (-1);
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}
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static int
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dbus_activate(pcap_t *handle)
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{
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#define EAVESDROPPING_RULE "eavesdrop=true,"
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static const char *rules[] = {
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EAVESDROPPING_RULE "type='signal'",
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EAVESDROPPING_RULE "type='method_call'",
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EAVESDROPPING_RULE "type='method_return'",
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EAVESDROPPING_RULE "type='error'",
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};
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#define N_RULES sizeof(rules)/sizeof(rules[0])
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struct pcap_dbus *handlep = handle->priv;
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const char *dev = handle->opt.device;
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DBusError error = DBUS_ERROR_INIT;
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u_int i;
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if (strcmp(dev, "dbus-system") == 0) {
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if (!(handlep->conn = dbus_bus_get(DBUS_BUS_SYSTEM, &error))) {
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pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Failed to get system bus: %s", error.message);
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dbus_error_free(&error);
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return PCAP_ERROR;
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}
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} else if (strcmp(dev, "dbus-session") == 0) {
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if (!(handlep->conn = dbus_bus_get(DBUS_BUS_SESSION, &error))) {
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pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Failed to get session bus: %s", error.message);
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dbus_error_free(&error);
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return PCAP_ERROR;
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}
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} else if (strncmp(dev, "dbus://", 7) == 0) {
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const char *addr = dev + 7;
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if (!(handlep->conn = dbus_connection_open(addr, &error))) {
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pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Failed to open connection to: %s: %s", addr, error.message);
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dbus_error_free(&error);
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return PCAP_ERROR;
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}
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if (!dbus_bus_register(handlep->conn, &error)) {
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pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Failed to register bus %s: %s\n", addr, error.message);
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dbus_error_free(&error);
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return PCAP_ERROR;
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}
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} else {
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pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Can't get bus address from %s", handle->opt.device);
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return PCAP_ERROR;
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}
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|
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/* Initialize some components of the pcap structure. */
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handle->bufsize = 0;
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handle->offset = 0;
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handle->linktype = DLT_DBUS;
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handle->read_op = dbus_read;
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handle->inject_op = dbus_write;
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handle->setfilter_op = install_bpf_program; /* XXX, later add support for dbus_bus_add_match() */
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handle->setdirection_op = NULL;
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handle->set_datalink_op = NULL; /* can't change data link type */
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handle->getnonblock_op = dbus_getnonblock;
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handle->setnonblock_op = dbus_setnonblock;
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handle->stats_op = dbus_stats;
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handle->cleanup_op = dbus_cleanup;
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#ifndef _WIN32
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/*
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* Unfortunately, trying to do a select()/poll()/epoll_wait()/
|
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* kevent()/etc. on a D-Bus connection isn't a simple
|
|
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* case of "give me an FD on which to wait".
|
|
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*
|
|
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* Apparently, you have to register "add watch", "remove watch",
|
|
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* and "toggle watch" functions with
|
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* dbus_connection_set_watch_functions(),
|
|
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* keep a *set* of FDs, add to that set in the "add watch"
|
|
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* function, subtract from it in the "remove watch" function,
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|
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* and either add to or subtract from that set in the "toggle
|
|
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* watch" function, and do the wait on *all* of the FDs in the
|
|
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* set. (Yes, you need the "toggle watch" function, so that
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|
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* the main loop doesn't itself need to check for whether
|
|
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* a given watch is enabled or disabled - most libpcap programs
|
|
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* know nothing about D-Bus and shouldn't *have* to know anything
|
|
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* about D-Bus other than how to decode D-Bus messages.)
|
|
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*
|
|
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* Implementing that would require considerable changes in
|
|
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* the way libpcap exports "selectable FDs" to its client.
|
|
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* Until that's done, we just say "you can't do that".
|
|
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*/
|
|
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handle->selectable_fd = handle->fd = -1;
|
|
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#endif
|
|
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209cc3 |
|
|
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if (handle->opt.rfmon) {
|
|
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209cc3 |
/*
|
|
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* Monitor mode doesn't apply to dbus connections.
|
|
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*/
|
|
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dbus_cleanup(handle);
|
|
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return PCAP_ERROR_RFMON_NOTSUP;
|
|
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209cc3 |
}
|
|
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209cc3 |
|
|
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209cc3 |
/*
|
|
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* Turn a negative snapshot value (invalid), a snapshot value of
|
|
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* 0 (unspecified), or a value bigger than the normal maximum
|
|
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* value, into the maximum message length for D-Bus (128MB).
|
|
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*/
|
|
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if (handle->snapshot <= 0 || handle->snapshot > 134217728)
|
|
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handle->snapshot = 134217728;
|
|
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209cc3 |
|
|
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209cc3 |
/* dbus_connection_set_max_message_size(handlep->conn, handle->snapshot); */
|
|
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209cc3 |
if (handle->opt.buffer_size != 0)
|
|
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209cc3 |
dbus_connection_set_max_received_size(handlep->conn, handle->opt.buffer_size);
|
|
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209cc3 |
|
|
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209cc3 |
for (i = 0; i < N_RULES; i++) {
|
|
Packit |
209cc3 |
dbus_bus_add_match(handlep->conn, rules[i], &error);
|
|
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209cc3 |
if (dbus_error_is_set(&error)) {
|
|
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209cc3 |
dbus_error_free(&error);
|
|
Packit |
209cc3 |
|
|
Packit |
209cc3 |
/* try without eavesdrop */
|
|
Packit |
209cc3 |
dbus_bus_add_match(handlep->conn, rules[i] + strlen(EAVESDROPPING_RULE), &error);
|
|
Packit |
209cc3 |
if (dbus_error_is_set(&error)) {
|
|
Packit |
209cc3 |
pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Failed to add bus match: %s\n", error.message);
|
|
Packit |
209cc3 |
dbus_error_free(&error);
|
|
Packit |
209cc3 |
dbus_cleanup(handle);
|
|
Packit |
209cc3 |
return PCAP_ERROR;
|
|
Packit |
209cc3 |
}
|
|
Packit |
209cc3 |
}
|
|
Packit |
209cc3 |
}
|
|
Packit |
209cc3 |
|
|
Packit |
209cc3 |
return 0;
|
|
Packit |
209cc3 |
}
|
|
Packit |
209cc3 |
|
|
Packit |
209cc3 |
pcap_t *
|
|
Packit |
209cc3 |
dbus_create(const char *device, char *ebuf, int *is_ours)
|
|
Packit |
209cc3 |
{
|
|
Packit |
209cc3 |
pcap_t *p;
|
|
Packit |
209cc3 |
|
|
Packit |
209cc3 |
if (strcmp(device, "dbus-system") &&
|
|
Packit |
209cc3 |
strcmp(device, "dbus-session") &&
|
|
Packit |
209cc3 |
strncmp(device, "dbus://", 7))
|
|
Packit |
209cc3 |
{
|
|
Packit |
209cc3 |
*is_ours = 0;
|
|
Packit |
209cc3 |
return NULL;
|
|
Packit |
209cc3 |
}
|
|
Packit |
209cc3 |
|
|
Packit |
209cc3 |
*is_ours = 1;
|
|
Packit |
209cc3 |
p = pcap_create_common(ebuf, sizeof (struct pcap_dbus));
|
|
Packit |
209cc3 |
if (p == NULL)
|
|
Packit |
209cc3 |
return (NULL);
|
|
Packit |
209cc3 |
|
|
Packit |
209cc3 |
p->activate_op = dbus_activate;
|
|
Packit |
209cc3 |
/*
|
|
Packit |
209cc3 |
* Set these up front, so that, even if our client tries
|
|
Packit |
209cc3 |
* to set non-blocking mode before we're activated, or
|
|
Packit |
209cc3 |
* query the state of non-blocking mode, they get an error,
|
|
Packit |
209cc3 |
* rather than having the non-blocking mode option set
|
|
Packit |
209cc3 |
* for use later.
|
|
Packit |
209cc3 |
*/
|
|
Packit |
209cc3 |
p->getnonblock_op = dbus_getnonblock;
|
|
Packit |
209cc3 |
p->setnonblock_op = dbus_setnonblock;
|
|
Packit |
209cc3 |
return (p);
|
|
Packit |
209cc3 |
}
|
|
Packit |
209cc3 |
|
|
Packit |
209cc3 |
int
|
|
Packit |
209cc3 |
dbus_findalldevs(pcap_if_list_t *devlistp, char *err_str)
|
|
Packit |
209cc3 |
{
|
|
Packit |
209cc3 |
/*
|
|
Packit |
209cc3 |
* The notion of "connected" vs. "disconnected" doesn't apply.
|
|
Packit |
209cc3 |
* XXX - what about the notions of "up" and "running"?
|
|
Packit |
209cc3 |
*/
|
|
Packit |
209cc3 |
if (add_dev(devlistp, "dbus-system",
|
|
Packit |
209cc3 |
PCAP_IF_CONNECTION_STATUS_NOT_APPLICABLE, "D-Bus system bus",
|
|
Packit |
209cc3 |
err_str) == NULL)
|
|
Packit |
209cc3 |
return -1;
|
|
Packit |
209cc3 |
if (add_dev(devlistp, "dbus-session",
|
|
Packit |
209cc3 |
PCAP_IF_CONNECTION_STATUS_NOT_APPLICABLE, "D-Bus session bus",
|
|
Packit |
209cc3 |
err_str) == NULL)
|
|
Packit |
209cc3 |
return -1;
|
|
Packit |
209cc3 |
return 0;
|
|
Packit |
209cc3 |
}
|
|
Packit |
209cc3 |
|