1 files changed, 458 insertions, 0 deletions

diff --git a/tools/idevicebtlogger.c b/tools/idevicebtlogger.c
new file mode 100644
index 0000000..8de6b22
--- /dev/null
+++ b/tools/idevicebtlogger.c
@@ -0,0 +1,458 @@
+/*
+ * idevicebt_packet_logger.c
+ * Capture Bluetooth HCI traffic to native PKLG or PCAP
+ *
+ * Copyright (c) 2021 Geoffrey Kruse, All Rights Reserved.
+ * Copyright (c) 2022 Matthias Ringwald, All Rights Reserved.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#define TOOL_NAME "idevicebtlogger"
+
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <getopt.h>
+#include <assert.h>
+#include <fcntl.h>
+
+#ifdef WIN32
+#include <windows.h>
+#define sleep(x) Sleep(x*1000)
+#else
+#include <arpa/inet.h>
+#endif
+
+
+#include <libimobiledevice/libimobiledevice.h>
+#include <libimobiledevice/bt_packet_logger.h>
+
+typedef enum {
+        HCI_COMMAND = 0x00,
+        HCI_EVENT = 0x01,
+        SENT_ACL_DATA = 0x02,
+        RECV_ACL_DATA = 0x03,
+        SENT_SCO_DATA = 0x08,
+        RECV_SCO_DATA = 0x09,
+} PacketLoggerPacketType;
+
+static int quit_flag = 0;
+static int exit_on_disconnect = 0;
+
+static char* udid = NULL;
+static idevice_t device = NULL;
+static bt_packet_logger_client_t bt_packet_logger = NULL;
+static int use_network = 0;
+static char* out_filename = NULL;
+static char* log_format_string = NULL;
+static FILE * packetlogger_file = NULL;
+
+static enum {
+        LOG_FORMAT_PACKETLOGGER,
+        LOG_FORMAT_PCAP
+} log_format = LOG_FORMAT_PACKETLOGGER;
+
+const uint8_t pcap_file_header[] = {
+        // Magic Number
+        0xA1, 0xB2, 0xC3, 0xD4,
+        // Major / Minor Version
+        0x00, 0x02, 0x00, 0x04,
+        // Reserved1
+        0x00, 0x00, 0x00, 0x00,
+        // Reserved2
+        0x00, 0x00, 0x00, 0x00,
+        // Snaplen == max packet size - use 2kB (larger than any ACL)
+        0x00, 0x00, 0x08, 0x00,
+        // LinkType: DLT_BLUETOOTH_HCI_H4_WITH_PHDR
+        0x00, 0x00, 0x00, 201,
+};
+
+static uint32_t big_endian_read_32(const uint8_t * buffer, int position)
+{
+        return ((uint32_t) buffer[position+3]) | (((uint32_t)buffer[position+2]) << 8) | (((uint32_t)buffer[position+1]) << 16) | (((uint32_t) buffer[position]) << 24);
+}
+
+static void big_endian_store_32(uint8_t * buffer, uint16_t position, uint32_t value)
+{
+        uint16_t pos = position;
+        buffer[pos++] = (uint8_t)(value >> 24);
+        buffer[pos++] = (uint8_t)(value >> 16);
+        buffer[pos++] = (uint8_t)(value >> 8);
+        buffer[pos++] = (uint8_t)(value);
+}
+
+/**
+ * Callback from the packet logger service to handle packets and log to PacketLogger format
+ */
+static void bt_packet_logger_callback_packetlogger(uint8_t * data, uint16_t len, void *user_data)
+{
+        (void) fwrite(data, 1, len, packetlogger_file);
+}
+
+/**
+ * Callback from the packet logger service to handle packets and log to pcap
+ */
+static void bt_packet_logger_callback_pcap(uint8_t * data, uint16_t len, void *user_data)
+{
+        // check len
+        if (len < 13) {
+                return;
+        }
+
+        // parse packet header (ignore len field)
+        uint32_t ts_secs = big_endian_read_32(data, 4);
+        uint32_t ts_us   = big_endian_read_32(data, 8);
+        uint8_t packet_type = data[12];
+        data += 13;
+        len  -= 13;
+
+        // map PacketLogger packet type onto PCAP direction flag and hci_h4_type
+        uint8_t direction_in = 0;
+        uint8_t hci_h4_type  = 0xff;
+        switch(packet_type) {
+                case HCI_COMMAND:
+                        hci_h4_type = 0x01;
+                        direction_in = 0;
+                        break;
+                case SENT_ACL_DATA:
+                        hci_h4_type = 0x02;
+                        direction_in = 0;
+                        break;
+                case RECV_ACL_DATA:
+                        hci_h4_type = 0x02;
+                        direction_in = 1;
+                        break;
+                case SENT_SCO_DATA:
+                        hci_h4_type = 0x03;
+                        direction_in = 0;
+                        break;
+                case RECV_SCO_DATA:
+                        hci_h4_type = 0x03;
+                        direction_in = 1;
+                        break;
+                case HCI_EVENT:
+                        hci_h4_type = 0x04;
+                        direction_in = 1;
+                        break;
+                default:
+                        // unknown packet logger type, drop packet
+                        return;
+        }
+
+        // setup pcap record header, 4 byte direction flag, 1 byte HCI H4 packet type, data
+        uint8_t pcap_record_header[21];
+        big_endian_store_32(pcap_record_header,  0, ts_secs);       // Timestamp seconds
+        big_endian_store_32(pcap_record_header,  4, ts_us);         // Timestamp microseconds
+        big_endian_store_32(pcap_record_header,  8, 4 + 1 + len);   // Captured  Packet Length
+        big_endian_store_32(pcap_record_header, 12, 4 + 1 + len);   // Original Packet Length
+        big_endian_store_32(pcap_record_header, 16, direction_in);  // Direction: Incoming = 1
+        pcap_record_header[20] = hci_h4_type;
+
+        // write header
+        (void) fwrite(pcap_record_header, 1, sizeof(pcap_record_header), packetlogger_file);
+
+        // write packet
+        (void) fwrite(data, 1, len, packetlogger_file);
+
+        // flush
+        (void) fflush(packetlogger_file);
+}
+
+/**
+ * Disable HCI log capture
+ */
+static void stop_logging(void)
+{
+        fflush(NULL);
+
+        if (bt_packet_logger) {
+                bt_packet_logger_client_free(bt_packet_logger);
+                bt_packet_logger = NULL;
+        }
+
+        if (device) {
+                idevice_free(device);
+                device = NULL;
+        }
+}
+
+/**
+ * Enable HCI log capture
+ */
+static int start_logging(void)
+{
+        idevice_error_t ret = idevice_new_with_options(&device, udid, (use_network) ? IDEVICE_LOOKUP_NETWORK : IDEVICE_LOOKUP_USBMUX);
+        if (ret != IDEVICE_E_SUCCESS) {
+                fprintf(stderr, "Device with udid %s not found!?\n", udid);
+                return -1;
+        }
+
+        lockdownd_client_t lockdown = NULL;
+        lockdownd_error_t lerr = lockdownd_client_new_with_handshake(device, &lockdown, TOOL_NAME);
+        if (lerr != LOCKDOWN_E_SUCCESS) {
+                fprintf(stderr, "ERROR: Could not connect to lockdownd: %d\n", lerr);
+                idevice_free(device);
+                device = NULL;
+                return -1;
+        }
+
+        /* start bt_packet_logger service */
+        bt_packet_logger_client_start_service(device, &bt_packet_logger, TOOL_NAME);
+
+        /* start capturing bt_packet_logger */
+        void (*callback)(uint8_t * data, uint16_t len, void *user_data);
+        switch (log_format){
+                case LOG_FORMAT_PCAP:
+                        callback = bt_packet_logger_callback_pcap;
+                        break;
+                case LOG_FORMAT_PACKETLOGGER:
+                        callback = bt_packet_logger_callback_packetlogger;
+                        break;
+                default:
+                        assert(0);
+                        return 0;
+        }
+        bt_packet_logger_error_t serr = bt_packet_logger_start_capture(bt_packet_logger, callback, NULL);
+        if (serr != BT_PACKET_LOGGER_E_SUCCESS) {
+                fprintf(stderr, "ERROR: Unable to start capturing bt_packet_logger.\n");
+                bt_packet_logger_client_free(bt_packet_logger);
+                bt_packet_logger = NULL;
+                idevice_free(device);
+                device = NULL;
+                return -1;
+        }
+
+        fprintf(stderr, "[connected:%s]\n", udid);
+        fflush(stderr);
+
+        return 0;
+}
+
+/**
+ * Callback for device events
+ */
+static void device_event_cb(const idevice_event_t* event, void* userdata)
+{
+        if (use_network && event->conn_type != CONNECTION_NETWORK) {
+                return;
+        } else if (!use_network && event->conn_type != CONNECTION_USBMUXD) {
+                return;
+        }
+        if (event->event == IDEVICE_DEVICE_ADD) {
+                if (!bt_packet_logger) {
+                        if (!udid) {
+                                udid = strdup(event->udid);
+                        }
+                        if (strcmp(udid, event->udid) == 0) {
+                                if (start_logging() != 0) {
+                                        fprintf(stderr, "Could not start logger for udid %s\n", udid);
+                                }
+                        }
+                }
+        } else if (event->event == IDEVICE_DEVICE_REMOVE) {
+                if (bt_packet_logger && (strcmp(udid, event->udid) == 0)) {
+                        stop_logging();
+                        fprintf(stderr, "[disconnected:%s]\n", udid);
+                        if (exit_on_disconnect) {
+                                quit_flag++;
+                        }
+                }
+        }
+}
+
+/**
+ * signal handler function for cleaning up properly
+ */
+static void clean_exit(int sig)
+{
+        fprintf(stderr, "\nExiting...\n");
+        quit_flag++;
+}
+
+/**
+ * print usage information
+ */
+static void print_usage(int argc, char **argv, int is_error)
+{
+        char *name = NULL;
+        name = strrchr(argv[0], '/');
+        fprintf(is_error ? stderr : stdout, "Usage: %s [OPTIONS] <FILE>\n", (name ? name + 1: argv[0]));
+        fprintf(is_error ? stderr : stdout,
+                "\n" \
+                "Capture HCI packets from a connected device.\n" \
+                "\n" \
+                "OPTIONS:\n" \
+                "  -u, --udid UDID     target specific device by UDID\n" \
+                "  -n, --network       connect to network device\n" \
+                "  -f, --format FORMAT logging format: packetlogger (default) or pcap\n" \
+                "  -x, --exit          exit when device disconnects\n" \
+                "  -h, --help          prints usage information\n" \
+                "  -d, --debug         enable communication debugging\n" \
+                "  -v, --version       prints version information\n" \
+                "\n" \
+                "Homepage:    <" PACKAGE_URL ">\n"
+                "Bug Reports: <" PACKAGE_BUGREPORT ">\n"
+        );
+}
+
+/**
+ * Program entry
+ */
+int main(int argc, char *argv[])
+{
+        int c = 0;
+        const struct option longopts[] = {
+                { "debug", no_argument, NULL, 'd' },
+                { "help", no_argument, NULL, 'h' },
+                { "udid", required_argument, NULL, 'u' },
+                { "format", required_argument, NULL, 'f' },
+                { "network", no_argument, NULL, 'n' },
+                { "exit", no_argument, NULL, 'x' },
+                { "version", no_argument, NULL, 'v' },
+                { NULL, 0, NULL, 0}
+        };
+
+        signal(SIGINT, clean_exit);
+        signal(SIGTERM, clean_exit);
+#ifndef WIN32
+        signal(SIGQUIT, clean_exit);
+        signal(SIGPIPE, SIG_IGN);
+#endif
+
+        while ((c = getopt_long(argc, argv, "dhu:f:nxv", longopts, NULL)) != -1) {
+                switch (c) {
+                case 'd':
+                        idevice_set_debug_level(1);
+                        break;
+                case 'u':
+                        if (!*optarg) {
+                                fprintf(stderr, "ERROR: UDID must not be empty!\n");
+                                print_usage(argc, argv, 1);
+                                return 2;
+                        }
+                        free(udid);
+                        udid = strdup(optarg);
+                        break;
+                case 'f':
+                        if (!*optarg) {
+                                fprintf(stderr, "ERROR: FORMAT must not be empty!\n");
+                                print_usage(argc, argv, 1);
+                                return 2;
+                        }
+                        free(log_format_string);
+                        log_format_string = strdup(optarg);
+                        break;
+                case 'n':
+                        use_network = 1;
+                        break;
+                case 'x':
+                        exit_on_disconnect = 1;
+                        break;
+                case 'h':
+                        print_usage(argc, argv, 0);
+                        return 0;
+                case 'v':
+                        printf("%s %s\n", TOOL_NAME, PACKAGE_VERSION);
+                        return 0;
+                default:
+                        print_usage(argc, argv, 1);
+                        return 2;
+                }
+        }
+
+        if (optind < argc) {
+                out_filename = argv[optind];
+                // printf("Output File: %s\n", out_filename);
+        }
+        else {
+                print_usage(argc, argv, 1);
+                return 2;
+        }
+
+        if (log_format_string != NULL){
+                if (strcmp("packetlogger", log_format_string) == 0){
+                        log_format = LOG_FORMAT_PACKETLOGGER;
+                } else if (strcmp("pcap", log_format_string) == 0){
+                        log_format = LOG_FORMAT_PCAP;
+                } else {
+                        printf("Unknown logging format: '%s'\n", log_format_string);
+                        print_usage(argc, argv, 1);
+                        return 2;
+                }
+        }
+
+        int num = 0;
+        idevice_info_t *devices = NULL;
+        idevice_get_device_list_extended(&devices, &num);
+        idevice_device_list_extended_free(devices);
+        if (num == 0) {
+                if (!udid) {
+                        fprintf(stderr, "No device found. Plug in a device or pass UDID with -u to wait for device to be available.\n");
+                        return -1;
+                } else {
+                        fprintf(stderr, "Waiting for device with UDID %s to become available...\n", udid);
+                }
+        }
+
+        // support streaming to stdout
+        if (strcmp(out_filename, "-") == 0){
+                packetlogger_file = stdout;
+        } else {
+                packetlogger_file = fopen(out_filename, "wb");
+        }
+
+
+        if (packetlogger_file == NULL){
+                fprintf(stderr, "Failed to open file %s, errno = %d\n", out_filename, errno);
+                return -2;
+        }
+
+        switch (log_format){
+                case LOG_FORMAT_PCAP:
+                        // printf("Output Format: PCAP\n");
+                        // write PCAP file header
+                        (void) fwrite(&pcap_file_header, 1, sizeof(pcap_file_header), packetlogger_file);
+                        break;
+                case LOG_FORMAT_PACKETLOGGER:
+                        printf("Output Format: PacketLogger\n");
+                        break;
+                default:
+                        assert(0);
+                        return -2;
+        }
+        idevice_subscription_context_t context = NULL;
+        idevice_events_subscribe(&context, device_event_cb, NULL);
+
+        while (!quit_flag) {
+                sleep(1);
+        }
+
+        idevice_events_unsubscribe(context);
+        stop_logging();
+
+        fclose(packetlogger_file);
+
+        free(udid);
+
+        return 0;
+}