On Monday, 19 February 2018 14:46:06 CET Szymon Janc wrote:
> This is intended for use for automated logging or unatrended systems.
> It doesn't contain any packet decoding functionality which results
> in much smaller binary.
> ---
> .gitignore | 1 +
> Makefile.tools | 5 +
> tools/btmon-logger.c | 350
> +++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 356
> insertions(+)
> create mode 100644 tools/btmon-logger.c
>
> diff --git a/.gitignore b/.gitignore
> index 47808059b..33ec66048 100644
> --- a/.gitignore
> +++ b/.gitignore
> @@ -118,6 +118,7 @@ tools/btconfig
> tools/btmgmt
> tools/btsnoop
> tools/btpclient
> +tools/btmon-logger
> peripheral/btsensor
> monitor/btmon
> emulator/btvirt
> diff --git a/Makefile.tools b/Makefile.tools
> index 71d083e71..ba4b9b7d7 100644
> --- a/Makefile.tools
> +++ b/Makefile.tools
> @@ -62,6 +62,11 @@ monitor_btmon_SOURCES = monitor/main.c monitor/bt.h \
> monitor/tty.h
> monitor_btmon_LDADD = lib/libbluetooth-internal.la \
> src/libshared-mainloop.la @UDEV_LIBS@
> +
> +noinst_PROGRAMS += tools/btmon-logger
> +
> +tools_btmon_logger_SOURCES = tools/btmon-logger.c lib/monitor.h
> +tools_btmon_logger_LDADD = src/libshared-mainloop.la
> endif
>
> if TESTING
> diff --git a/tools/btmon-logger.c b/tools/btmon-logger.c
> new file mode 100644
> index 000000000..9787e6b03
> --- /dev/null
> +++ b/tools/btmon-logger.c
> @@ -0,0 +1,350 @@
> +/*
> + *
> + * BlueZ - Bluetooth protocol stack for Linux
> + *
> + * Copyright (C) 2017-2018 Codecoup
> + * Copyright (C) 2011-2014 Intel Corporation
> + * Copyright (C) 2002-2010 Marcel Holtmann <marcel@xxxxxxxxxxxx>
> + *
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
> USA + *
> + */
> +
> +#ifdef HAVE_CONFIG_H
> +#include <config.h>
> +#endif
> +
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <limits.h>
> +#include <string.h>
> +#include <time.h>
> +#include <getopt.h>
> +#include <unistd.h>
> +#include <sys/socket.h>
> +
> +#include "lib/bluetooth.h"
> +#include "lib/hci.h"
> +
> +#include "src/shared/util.h"
> +#include "src/shared/mainloop.h"
> +#include "src/shared/btsnoop.h"
> +
> +#define MONITOR_INDEX_NONE 0xffff
> +
> +struct monitor_hdr {
> + uint16_t opcode;
> + uint16_t index;
> + uint16_t len;
> +} __attribute__ ((packed));
> +
> +struct btsnoop_hdr {
> + uint8_t id[8]; /* Identification Pattern */
> + uint32_t version; /* Version Number = 1 */
> + uint32_t type; /* Datalink Type */
> +} __attribute__ ((packed));
> +#define BTSNOOP_HDR_SIZE (sizeof(struct btsnoop_hdr))
> +
> +struct btsnoop_pkt {
> + uint32_t size; /* Original Length */
> + uint32_t len; /* Included Length */
> + uint32_t flags; /* Packet Flags */
> + uint32_t drops; /* Cumulative Drops */
> + uint64_t ts; /* Timestamp microseconds */
> + uint8_t data[0]; /* Packet Data */
> +} __attribute__ ((packed));
> +#define BTSNOOP_PKT_SIZE (sizeof(struct btsnoop_pkt))
> +
> +static const char *path = ".";
> +static const char *prefix = "hci";
> +static bool suffix_date = false;
> +static size_t write_limit = 0;
> +static size_t write_size = 0;
> +
> +static struct btsnoop *btsnoop_file = NULL;
> +
> +static bool create_btsnoop(void)
> +{
> + static char real_path[FILENAME_MAX];
> + struct timeval tv;
> +
> + gettimeofday(&tv, NULL);
> +
> + if (suffix_date) {
> + struct tm tm;
> +
> + localtime_r(&tv.tv_sec, &tm);
> +
> + snprintf(real_path, FILENAME_MAX,
> + "%s/%s_%04d-%02d-%02d_%02d:%02d:%02d.btsnoop",
> + path, prefix, tm.tm_year + 1900, tm.tm_mon + 1,
> + tm.tm_mday, tm.tm_hour, tm.tm_min, tm.tm_sec);
> + } else {
> + static unsigned int cnt = 0;
> +
> + snprintf(real_path, sizeof(real_path), "%s/%s_%u.btsnoop",
> + path, prefix, cnt++);
> + }
> +
> + btsnoop_file = btsnoop_create(real_path, BTSNOOP_FORMAT_MONITOR);
> + if(!btsnoop_file)
> + return false;
> +
> + write_size = BTSNOOP_HDR_SIZE;
> +
> + return true;
> +}
> +
> +static void rotate_btsnoop(uint16_t pktlen)
> +{
> + write_size += BTSNOOP_PKT_SIZE + pktlen;
> +
> + if (write_size <= write_limit)
> + return;
> +
> + btsnoop_unref(btsnoop_file);
> +
> + if (!create_btsnoop()) {
> + fprintf(stderr, "Failed to create btsnoop file, exiting.\n");
> + mainloop_quit();
> + return;
> + }
> +
> + write_size += BTSNOOP_PKT_SIZE + pktlen;
> +}
> +
> +static void data_callback(int fd, uint32_t events, void *user_data)
> +{
> + uint8_t buf[BTSNOOP_MAX_PACKET_SIZE];
> + unsigned char control[64];
> + struct monitor_hdr hdr;
> + struct msghdr msg;
> + struct iovec iov[2];
> +
> + if (events & (EPOLLERR | EPOLLHUP)) {
> + mainloop_remove_fd(fd);
> + return;
> + }
> +
> + iov[0].iov_base = &hdr;
> + iov[0].iov_len = sizeof(hdr);
> + iov[1].iov_base = buf;
> + iov[1].iov_len = sizeof(buf);
> +
> + memset(&msg, 0, sizeof(msg));
> + msg.msg_iov = iov;
> + msg.msg_iovlen = 2;
> + msg.msg_control = control;
> + msg.msg_controllen = sizeof(control);
> +
> + while (1) {
> + struct cmsghdr *cmsg;
> + struct timeval *tv = NULL;
> + struct timeval ctv;
> + uint16_t opcode, index, pktlen;
> + ssize_t len;
> +
> + len = recvmsg(fd, &msg, MSG_DONTWAIT);
> + if (len < 0)
> + break;
> +
> + if (len < (ssize_t) sizeof(hdr))
> + break;
> +
> + for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL;
> + cmsg = CMSG_NXTHDR(&msg, cmsg)) {
> + if (cmsg->cmsg_level != SOL_SOCKET)
> + continue;
> +
> + if (cmsg->cmsg_type == SCM_TIMESTAMP) {
> + memcpy(&ctv, CMSG_DATA(cmsg), sizeof(ctv));
> + tv = &ctv;
> + }
> + }
> +
> + opcode = le16_to_cpu(hdr.opcode);
> + index = le16_to_cpu(hdr.index);
> + pktlen = le16_to_cpu(hdr.len);
> +
> + if (write_limit)
> + rotate_btsnoop(pktlen);
> +
> + btsnoop_write_hci(btsnoop_file, tv, index, opcode, 0, buf,
> + pktlen);
> + }
> +}
> +
> +static bool open_monitor_channel(void)
> +{
> + struct sockaddr_hci addr;
> + int fd, opt = 1;
> +
> + fd = socket(AF_BLUETOOTH, SOCK_RAW | SOCK_CLOEXEC, BTPROTO_HCI);
> + if (fd < 0) {
> + perror("Failed to open monitor channel");
> + return false;
> + }
> +
> + memset(&addr, 0, sizeof(addr));
> + addr.hci_family = AF_BLUETOOTH;
> + addr.hci_dev = HCI_DEV_NONE;
> + addr.hci_channel = HCI_CHANNEL_MONITOR;
> +
> + if (bind(fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
> + perror("Failed to bind monitor channel");
> + close(fd);
> + return false;
> + }
> +
> + if (setsockopt(fd, SOL_SOCKET, SO_TIMESTAMP, &opt, sizeof(opt)) < 0) {
> + perror("Failed to enable timestamps");
> + close(fd);
> + return false;
> + }
> +
> + if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &opt, sizeof(opt)) < 0) {
> + perror("Failed to enable credentials");
> + close(fd);
> + return false;
> + }
> +
> + mainloop_add_fd(fd, EPOLLIN, data_callback, NULL, NULL);
> +
> + return true;
> +}
> +
> +static void signal_callback(int signum, void *user_data)
> +{
> + switch (signum) {
> + case SIGINT:
> + case SIGTERM:
> + mainloop_quit();
> + break;
> + }
> +}
> +
> +static void usage(void)
> +{
> + printf("btmon-logger - Bluetooth monitor\n"
> + "Usage:\n");
> + printf("\tbtmon-logger [options]\n");
> + printf("options:\n"
> + "\t-p, --path <path> Save traces in specified path\n"
> + "\t-P, --prefix <name> Prefix filenames (defaults: \"hci\"\n"
> + "\t-d, --date Suffix filenames with date\n"
> + "\t-l, --limit <limit> Limit btsnoop file size (rotate)\n"
> + "\t-v, --version Show version\n"
> + "\t-h, --help Show help options\n");
> +}
> +
> +static const struct option main_options[] = {
> + { "path", required_argument, NULL, 'p' },
> + { "prefix", required_argument, NULL, 'P' },
> + { "date", no_argument, NULL, 'd' },
> + { "limit", required_argument, NULL, 'l' },
> + { "version", no_argument, NULL, 'v' },
> + { "help", no_argument, NULL, 'h' },
> + { }
> +};
> +
> +int main(int argc, char *argv[])
> +{
> + sigset_t mask;
> + char *endptr;
> + int ret;
> +
> + mainloop_init();
> +
> + while (true) {
> + int opt;
> +
> + opt = getopt_long(argc, argv, "p:P:dl:Lvh", main_options,
> + NULL);
> + if (opt < 0)
> + break;
> +
> + switch (opt) {
> + case 'p':
> + path = optarg;
> + if (strlen(path) > PATH_MAX) {
> + fprintf(stderr, "Too long path\n");
> + return EXIT_FAILURE;
> + }
> + break;
> + case 'P':
> + prefix = optarg;
> + break;
> + case 'd':
> + suffix_date = true;
> + break;
> + case 'l':
> + write_limit = strtoul(optarg, &endptr, 10);
> +
> + if (write_limit == ULONG_MAX) {
> + fprintf(stderr, "Invalid limit\n");
> + return EXIT_FAILURE;
> + }
> +
> + if (*endptr != '\0') {
> + if (*endptr == 'K' || *endptr == 'k') {
> + write_limit *= 1024;
> + } else if (*endptr == 'M' || *endptr == 'm') {
> + write_limit *= 1024 * 1024;
> + } else {
> + fprintf(stderr, "Invalid limit\n");
> + return EXIT_FAILURE;
> + }
> + }
> +
> + /* limit this to reasonable size */
> + if (write_limit < 4096) {
> + fprintf(stderr, "Too small limit value\n");
> + return EXIT_FAILURE;
> + }
> + break;
> + case 'v':
> + printf("%s\n", VERSION);
> + return EXIT_SUCCESS;
> + case 'h':
> + usage();
> + return EXIT_SUCCESS;
> + default:
> + return EXIT_FAILURE;
> + }
> + }
> +
> + if (argc - optind > 0) {
> + fprintf(stderr, "Invalid command line parameters\n");
> + return EXIT_FAILURE;
> + }
> +
> + if (!open_monitor_channel() || !create_btsnoop())
> + return EXIT_FAILURE;
> +
> + sigemptyset(&mask);
> + sigaddset(&mask, SIGINT);
> + sigaddset(&mask, SIGTERM);
> +
> + mainloop_set_signal(&mask, signal_callback, NULL, NULL);
> +
> + printf("Bluetooth monitor ver %s\n", VERSION);
> +
> + ret = mainloop_run();
> +
> + btsnoop_unref(btsnoop_file);
> +
> + return ret;
> +}
Any comments on this?
--
pozdrawiam
Szymon Janc
--
To unsubscribe from this list: send the line "unsubscribe linux-bluetooth" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
