fea8707db3
MFC after: 1 month
280 lines
7.5 KiB
C
280 lines
7.5 KiB
C
/*
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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, 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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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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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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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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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.source;
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DBusError error = DBUS_ERROR_INIT;
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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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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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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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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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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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snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Can't get bus address from %s", handle->opt.source);
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return PCAP_ERROR;
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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 = pcap_getnonblock_fd;
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handle->setnonblock_op = pcap_setnonblock_fd;
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handle->stats_op = dbus_stats;
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handle->selectable_fd = handle->fd = -1;
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if (handle->opt.rfmon) {
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/*
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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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}
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/* dbus_connection_set_max_message_size(handlep->conn, handle->snapshot); */
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if (handle->opt.buffer_size != 0)
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dbus_connection_set_max_received_size(handlep->conn, handle->opt.buffer_size);
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for (i = 0; i < N_RULES; i++) {
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dbus_bus_add_match(handlep->conn, rules[i], &error);
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if (dbus_error_is_set(&error)) {
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dbus_error_free(&error);
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/* try without eavesdrop */
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dbus_bus_add_match(handlep->conn, rules[i] + strlen(EAVESDROPPING_RULE), &error);
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if (dbus_error_is_set(&error)) {
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snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Failed to add bus match: %s\n", error.message);
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dbus_error_free(&error);
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dbus_cleanup(handle);
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return PCAP_ERROR;
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}
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}
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}
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return 0;
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}
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pcap_t *
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dbus_create(const char *device, char *ebuf, int *is_ours)
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{
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pcap_t *p;
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if (strcmp(device, "dbus-system") &&
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strcmp(device, "dbus-session") &&
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strncmp(device, "dbus://", 7))
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{
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*is_ours = 0;
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return NULL;
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}
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*is_ours = 1;
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p = pcap_create_common(device, ebuf, sizeof (struct pcap_dbus));
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if (p == NULL)
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return (NULL);
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p->activate_op = dbus_activate;
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return (p);
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}
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int
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dbus_findalldevs(pcap_if_t **alldevsp, char *err_str)
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{
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if (pcap_add_if(alldevsp, "dbus-system", 0, "D-Bus system bus", err_str) < 0)
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return -1;
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if (pcap_add_if(alldevsp, "dbus-session", 0, "D-Bus session bus", err_str) < 0)
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return -1;
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return 0;
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}
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