[thirdparty/systemd.git] / src / udev / udevadm-monitor.c

/*
 * Copyright (C) 2004-2010 Kay Sievers <kay@vrfy.org>
 *
 * 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, see <http://www.gnu.org/licenses/>.
 */

#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <signal.h>
#include <getopt.h>
#include <time.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/epoll.h>
#include <linux/types.h>
#include <linux/netlink.h>

#include "udev.h"

static bool udev_exit;

static void sig_handler(int signum)
{
        if (signum == SIGINT || signum == SIGTERM)
                udev_exit = true;
}

static void print_device(struct udev_device *device, const char *source, int prop)
{
        struct timespec ts;

        clock_gettime(CLOCK_MONOTONIC, &ts);
        printf("%-6s[%llu.%06u] %-8s %s (%s)\n",
               source,
               (unsigned long long) ts.tv_sec, (unsigned int) ts.tv_nsec/1000,
               udev_device_get_action(device),
               udev_device_get_devpath(device),
               udev_device_get_subsystem(device));
        if (prop) {
                struct udev_list_entry *list_entry;

                udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(device))
                        printf("%s=%s\n",
                               udev_list_entry_get_name(list_entry),
                               udev_list_entry_get_value(list_entry));
                printf("\n");
        }
}

static void help(void) {
        printf("Usage: udevadm monitor [--property] [--kernel] [--udev] [--help]\n"
               "  -p,--property                            print the event properties\n"
               "  -k,--kernel                              print kernel uevents\n"
               "  -u,--udev                                print udev events\n"
               "  -s,--subsystem-match=SUBSYSTEM[/DEVTYPE] filter events by subsystem\n"
               "  -t,--tag-match=TAG                       filter events by tag\n"
               "  -h,--help\n\n");
}

static int adm_monitor(struct udev *udev, int argc, char *argv[])
{
        struct sigaction act = {};
        sigset_t mask;
        int option;
        bool prop = false;
        bool print_kernel = false;
        bool print_udev = false;
        struct udev_list subsystem_match_list;
        struct udev_list tag_match_list;
        struct udev_monitor *udev_monitor = NULL;
        struct udev_monitor *kernel_monitor = NULL;
        int fd_ep = -1;
        int fd_kernel = -1, fd_udev = -1;
        struct epoll_event ep_kernel, ep_udev;
        int rc = 0, c;

        static const struct option options[] = {
                { "property",        no_argument,       NULL, 'p' },
                { "environment",     no_argument,       NULL, 'e' }, /* alias for -p */
                { "kernel",          no_argument,       NULL, 'k' },
                { "udev",            no_argument,       NULL, 'u' },
                { "subsystem-match", required_argument, NULL, 's' },
                { "tag-match",       required_argument, NULL, 't' },
                { "help",            no_argument,       NULL, 'h' },
                {}
        };

        udev_list_init(udev, &subsystem_match_list, true);
        udev_list_init(udev, &tag_match_list, true);

        while((c = getopt_long(argc, argv, "pekus:t:h", options, NULL)) >= 0)
                switch (c) {
                case 'p':
                case 'e':
                        prop = true;
                        break;
                case 'k':
                        print_kernel = true;
                        break;
                case 'u':
                        print_udev = true;
                        break;
                case 's':
                        {
                                char subsys[UTIL_NAME_SIZE];
                                char *devtype;

                                strscpy(subsys, sizeof(subsys), optarg);
                                devtype = strchr(subsys, '/');
                                if (devtype != NULL) {
                                        devtype[0] = '\0';
                                        devtype++;
                                }
                                udev_list_entry_add(&subsystem_match_list, subsys, devtype);
                                break;
                        }
                case 't':
                        udev_list_entry_add(&tag_match_list, optarg, NULL);
                        break;
                case 'h':
                        help();
                        goto out;
                default:
                        rc = 1;
                        goto out;
                }

        if (!print_kernel && !print_udev) {
                print_kernel = true;
                print_udev = true;
        }

        /* set signal handlers */
        act.sa_handler = sig_handler;
        act.sa_flags = SA_RESTART;
        sigaction(SIGINT, &act, NULL);
        sigaction(SIGTERM, &act, NULL);
        sigemptyset(&mask);
        sigaddset(&mask, SIGINT);
        sigaddset(&mask, SIGTERM);
        sigprocmask(SIG_UNBLOCK, &mask, NULL);

        fd_ep = epoll_create1(EPOLL_CLOEXEC);
        if (fd_ep < 0) {
                log_error("error creating epoll fd: %m\n");
                goto out;
        }

        printf("monitor will print the received events for:\n");
        if (print_udev) {
                struct udev_list_entry *entry;

                udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
                if (udev_monitor == NULL) {
                        fprintf(stderr, "error: unable to create netlink socket\n");
                        rc = 1;
                        goto out;
                }
                udev_monitor_set_receive_buffer_size(udev_monitor, 128*1024*1024);
                fd_udev = udev_monitor_get_fd(udev_monitor);

                udev_list_entry_foreach(entry, udev_list_get_entry(&subsystem_match_list)) {
                        const char *subsys = udev_list_entry_get_name(entry);
                        const char *devtype = udev_list_entry_get_value(entry);

                        if (udev_monitor_filter_add_match_subsystem_devtype(udev_monitor, subsys, devtype) < 0)
                                fprintf(stderr, "error: unable to apply subsystem filter '%s'\n", subsys);
                }

                udev_list_entry_foreach(entry, udev_list_get_entry(&tag_match_list)) {
                        const char *tag = udev_list_entry_get_name(entry);

                        if (udev_monitor_filter_add_match_tag(udev_monitor, tag) < 0)
                                fprintf(stderr, "error: unable to apply tag filter '%s'\n", tag);
                }

                if (udev_monitor_enable_receiving(udev_monitor) < 0) {
                        fprintf(stderr, "error: unable to subscribe to udev events\n");
                        rc = 2;
                        goto out;
                }

                memset(&ep_udev, 0, sizeof(struct epoll_event));
                ep_udev.events = EPOLLIN;
                ep_udev.data.fd = fd_udev;
                if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_udev, &ep_udev) < 0) {
                        log_error("fail to add fd to epoll: %m\n");
                        goto out;
                }

                printf("UDEV - the event which udev sends out after rule processing\n");
        }

        if (print_kernel) {
                struct udev_list_entry *entry;

                kernel_monitor = udev_monitor_new_from_netlink(udev, "kernel");
                if (kernel_monitor == NULL) {
                        fprintf(stderr, "error: unable to create netlink socket\n");
                        rc = 3;
                        goto out;
                }
                udev_monitor_set_receive_buffer_size(kernel_monitor, 128*1024*1024);
                fd_kernel = udev_monitor_get_fd(kernel_monitor);

                udev_list_entry_foreach(entry, udev_list_get_entry(&subsystem_match_list)) {
                        const char *subsys = udev_list_entry_get_name(entry);

                        if (udev_monitor_filter_add_match_subsystem_devtype(kernel_monitor, subsys, NULL) < 0)
                                fprintf(stderr, "error: unable to apply subsystem filter '%s'\n", subsys);
                }

                if (udev_monitor_enable_receiving(kernel_monitor) < 0) {
                        fprintf(stderr, "error: unable to subscribe to kernel events\n");
                        rc = 4;
                        goto out;
                }

                memset(&ep_kernel, 0, sizeof(struct epoll_event));
                ep_kernel.events = EPOLLIN;
                ep_kernel.data.fd = fd_kernel;
                if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_kernel, &ep_kernel) < 0) {
                        log_error("fail to add fd to epoll: %m\n");
                        goto out;
                }

                printf("KERNEL - the kernel uevent\n");
        }
        printf("\n");

        while (!udev_exit) {
                int fdcount;
                struct epoll_event ev[4];
                int i;

                fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), -1);
                if (fdcount < 0) {
                        if (errno != EINTR)
                                fprintf(stderr, "error receiving uevent message: %m\n");
                        continue;
                }

                for (i = 0; i < fdcount; i++) {
                        if (ev[i].data.fd == fd_kernel && ev[i].events & EPOLLIN) {
                                struct udev_device *device;

                                device = udev_monitor_receive_device(kernel_monitor);
                                if (device == NULL)
                                        continue;
                                print_device(device, "KERNEL", prop);
                                udev_device_unref(device);
                        } else if (ev[i].data.fd == fd_udev && ev[i].events & EPOLLIN) {
                                struct udev_device *device;

                                device = udev_monitor_receive_device(udev_monitor);
                                if (device == NULL)
                                        continue;
                                print_device(device, "UDEV", prop);
                                udev_device_unref(device);
                        }
                }
        }
out:
        if (fd_ep >= 0)
                close(fd_ep);
        udev_monitor_unref(udev_monitor);
        udev_monitor_unref(kernel_monitor);
        udev_list_cleanup(&subsystem_match_list);
        udev_list_cleanup(&tag_match_list);
        return rc;
}

const struct udevadm_cmd udevadm_monitor = {
        .name = "monitor",
        .cmd = adm_monitor,
        .help = "listen to kernel and udev events",
};
Commit	Line	Data
1bc33626	1	/*
1298001e	2	* Copyright (C) 2004-2010 Kay Sievers <kay@vrfy.org>
1bc33626	3	*
55e9959b KS	4	* This program is free software: you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License as published by
	6	* the Free Software Foundation, either version 2 of the License, or
	7	* (at your option) any later version.
1bc33626	8	*
55e9959b KS	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
	15	* along with this program. If not, see <http://www.gnu.org/licenses/>.
1bc33626 KS	16	*/
	17
	18	#include <unistd.h>
	19	#include <stdio.h>
	20	#include <stdlib.h>
9571122e	21	#include <stddef.h>
1bc33626 KS	22	#include <string.h>
1bc33626 KS	23	#include <fcntl.h>
1bc33626	24	#include <errno.h>
9ae611be	25	#include <signal.h>
0d2516c3	26	#include <getopt.h>
2315e570	27	#include <time.h>
38ff77b8	28	#include <sys/time.h>
1bc33626 KS	29	#include <sys/socket.h>
1bc33626 KS	30	#include <sys/un.h>
578cd510	31	#include <sys/epoll.h>
62821d0d	32	#include <linux/types.h>
1bc33626	33	#include <linux/netlink.h>
1bc33626 KS	34
1bc33626 KS	35	#include "udev.h"
1bc33626	36
578cd510	37	static bool udev_exit;
1bc33626	38
619b97ff	39	static void sig_handler(int signum)
9ae611be	40	{
912541b0 KS	41	if (signum == SIGINT \|\| signum == SIGTERM)
912541b0 KS	42	udev_exit = true;
9ae611be KS	43	}
9ae611be KS	44
b0d5e0df	45	static void print_device(struct udev_device device, const char source, int prop)
0de33a61	46	{
912541b0 KS	47	struct timespec ts;
	48
	49	clock_gettime(CLOCK_MONOTONIC, &ts);
	50	printf("%-6s[%llu.%06u] %-8s %s (%s)\n",
	51	source,
	52	(unsigned long long) ts.tv_sec, (unsigned int) ts.tv_nsec/1000,
	53	udev_device_get_action(device),
	54	udev_device_get_devpath(device),
	55	udev_device_get_subsystem(device));
	56	if (prop) {
	57	struct udev_list_entry *list_entry;
	58
	59	udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(device))
	60	printf("%s=%s\n",
	61	udev_list_entry_get_name(list_entry),
	62	udev_list_entry_get_value(list_entry));
	63	printf("\n");
	64	}
0de33a61 KS	65	}
0de33a61 KS	66
7643ac9a ZJS	67	static void help(void) {
	68	printf("Usage: udevadm monitor [--property] [--kernel] [--udev] [--help]\n"
	69	" -p,--property print the event properties\n"
	70	" -k,--kernel print kernel uevents\n"
	71	" -u,--udev print udev events\n"
	72	" -s,--subsystem-match=SUBSYSTEM[/DEVTYPE] filter events by subsystem\n"
	73	" -t,--tag-match=TAG filter events by tag\n"
	74	" -h,--help\n\n");
	75	}
	76
1985c76e	77	static int adm_monitor(struct udev udev, int argc, char argv[])
1bc33626	78	{
9d458c09	79	struct sigaction act = {};
912541b0 KS	80	sigset_t mask;
	81	int option;
	82	bool prop = false;
	83	bool print_kernel = false;
	84	bool print_udev = false;
	85	struct udev_list subsystem_match_list;
	86	struct udev_list tag_match_list;
	87	struct udev_monitor *udev_monitor = NULL;
	88	struct udev_monitor *kernel_monitor = NULL;
	89	int fd_ep = -1;
	90	int fd_kernel = -1, fd_udev = -1;
	91	struct epoll_event ep_kernel, ep_udev;
7643ac9a	92	int rc = 0, c;
912541b0 KS	93
912541b0 KS	94	static const struct option options[] = {
7643ac9a ZJS	95	{ "property", no_argument, NULL, 'p' },
	96	{ "environment", no_argument, NULL, 'e' }, /* alias for -p */
	97	{ "kernel", no_argument, NULL, 'k' },
	98	{ "udev", no_argument, NULL, 'u' },
912541b0	99	{ "subsystem-match", required_argument, NULL, 's' },
7643ac9a ZJS	100	{ "tag-match", required_argument, NULL, 't' },
7643ac9a ZJS	101	{ "help", no_argument, NULL, 'h' },
912541b0 KS	102	{}
	103	};
	104
	105	udev_list_init(udev, &subsystem_match_list, true);
	106	udev_list_init(udev, &tag_match_list, true);
	107
7643ac9a ZJS	108	while((c = getopt_long(argc, argv, "pekus:t:h", options, NULL)) >= 0)
7643ac9a ZJS	109	switch (c) {
912541b0 KS	110	case 'p':
	111	case 'e':
	112	prop = true;
	113	break;
	114	case 'k':
	115	print_kernel = true;
	116	break;
	117	case 'u':
	118	print_udev = true;
	119	break;
	120	case 's':
	121	{
	122	char subsys[UTIL_NAME_SIZE];
	123	char *devtype;
	124
d5a89d7d	125	strscpy(subsys, sizeof(subsys), optarg);
912541b0 KS	126	devtype = strchr(subsys, '/');
	127	if (devtype != NULL) {
	128	devtype[0] = '\0';
	129	devtype++;
	130	}
	131	udev_list_entry_add(&subsystem_match_list, subsys, devtype);
	132	break;
	133	}
	134	case 't':
	135	udev_list_entry_add(&tag_match_list, optarg, NULL);
	136	break;
	137	case 'h':
7643ac9a	138	help();
912541b0 KS	139	goto out;
	140	default:
	141	rc = 1;
	142	goto out;
	143	}
912541b0 KS	144
	145	if (!print_kernel && !print_udev) {
	146	print_kernel = true;
	147	print_udev = true;
	148	}
	149
	150	/* set signal handlers */
912541b0	151	act.sa_handler = sig_handler;
912541b0 KS	152	act.sa_flags = SA_RESTART;
	153	sigaction(SIGINT, &act, NULL);
	154	sigaction(SIGTERM, &act, NULL);
	155	sigemptyset(&mask);
	156	sigaddset(&mask, SIGINT);
	157	sigaddset(&mask, SIGTERM);
	158	sigprocmask(SIG_UNBLOCK, &mask, NULL);
	159
	160	fd_ep = epoll_create1(EPOLL_CLOEXEC);
	161	if (fd_ep < 0) {
baa30fbc	162	log_error("error creating epoll fd: %m\n");
912541b0 KS	163	goto out;
	164	}
	165
	166	printf("monitor will print the received events for:\n");
	167	if (print_udev) {
	168	struct udev_list_entry *entry;
	169
	170	udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
	171	if (udev_monitor == NULL) {
	172	fprintf(stderr, "error: unable to create netlink socket\n");
	173	rc = 1;
	174	goto out;
	175	}
	176	udev_monitor_set_receive_buffer_size(udev_monitor, 12810241024);
	177	fd_udev = udev_monitor_get_fd(udev_monitor);
	178
	179	udev_list_entry_foreach(entry, udev_list_get_entry(&subsystem_match_list)) {
	180	const char *subsys = udev_list_entry_get_name(entry);
	181	const char *devtype = udev_list_entry_get_value(entry);
	182
	183	if (udev_monitor_filter_add_match_subsystem_devtype(udev_monitor, subsys, devtype) < 0)
	184	fprintf(stderr, "error: unable to apply subsystem filter '%s'\n", subsys);
	185	}
	186
	187	udev_list_entry_foreach(entry, udev_list_get_entry(&tag_match_list)) {
	188	const char *tag = udev_list_entry_get_name(entry);
	189
	190	if (udev_monitor_filter_add_match_tag(udev_monitor, tag) < 0)
	191	fprintf(stderr, "error: unable to apply tag filter '%s'\n", tag);
	192	}
	193
	194	if (udev_monitor_enable_receiving(udev_monitor) < 0) {
	195	fprintf(stderr, "error: unable to subscribe to udev events\n");
	196	rc = 2;
	197	goto out;
	198	}
	199
	200	memset(&ep_udev, 0, sizeof(struct epoll_event));
	201	ep_udev.events = EPOLLIN;
	202	ep_udev.data.fd = fd_udev;
	203	if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_udev, &ep_udev) < 0) {
baa30fbc	204	log_error("fail to add fd to epoll: %m\n");
912541b0 KS	205	goto out;
	206	}
	207
	208	printf("UDEV - the event which udev sends out after rule processing\n");
	209	}
	210
	211	if (print_kernel) {
	212	struct udev_list_entry *entry;
	213
	214	kernel_monitor = udev_monitor_new_from_netlink(udev, "kernel");
	215	if (kernel_monitor == NULL) {
	216	fprintf(stderr, "error: unable to create netlink socket\n");
	217	rc = 3;
	218	goto out;
	219	}
	220	udev_monitor_set_receive_buffer_size(kernel_monitor, 12810241024);
	221	fd_kernel = udev_monitor_get_fd(kernel_monitor);
	222
	223	udev_list_entry_foreach(entry, udev_list_get_entry(&subsystem_match_list)) {
	224	const char *subsys = udev_list_entry_get_name(entry);
	225
	226	if (udev_monitor_filter_add_match_subsystem_devtype(kernel_monitor, subsys, NULL) < 0)
	227	fprintf(stderr, "error: unable to apply subsystem filter '%s'\n", subsys);
	228	}
	229
	230	if (udev_monitor_enable_receiving(kernel_monitor) < 0) {
	231	fprintf(stderr, "error: unable to subscribe to kernel events\n");
	232	rc = 4;
	233	goto out;
	234	}
	235
	236	memset(&ep_kernel, 0, sizeof(struct epoll_event));
	237	ep_kernel.events = EPOLLIN;
	238	ep_kernel.data.fd = fd_kernel;
	239	if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_kernel, &ep_kernel) < 0) {
baa30fbc	240	log_error("fail to add fd to epoll: %m\n");
912541b0 KS	241	goto out;
	242	}
	243
	244	printf("KERNEL - the kernel uevent\n");
	245	}
	246	printf("\n");
	247
	248	while (!udev_exit) {
	249	int fdcount;
	250	struct epoll_event ev[4];
	251	int i;
	252
8fef0ff2	253	fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), -1);
912541b0 KS	254	if (fdcount < 0) {
	255	if (errno != EINTR)
	256	fprintf(stderr, "error receiving uevent message: %m\n");
	257	continue;
	258	}
	259
	260	for (i = 0; i < fdcount; i++) {
	261	if (ev[i].data.fd == fd_kernel && ev[i].events & EPOLLIN) {
	262	struct udev_device *device;
	263
	264	device = udev_monitor_receive_device(kernel_monitor);
	265	if (device == NULL)
	266	continue;
	267	print_device(device, "KERNEL", prop);
	268	udev_device_unref(device);
	269	} else if (ev[i].data.fd == fd_udev && ev[i].events & EPOLLIN) {
	270	struct udev_device *device;
	271
	272	device = udev_monitor_receive_device(udev_monitor);
	273	if (device == NULL)
	274	continue;
	275	print_device(device, "UDEV", prop);
	276	udev_device_unref(device);
	277	}
	278	}
	279	}
40caaeec	280	out:
912541b0 KS	281	if (fd_ep >= 0)
	282	close(fd_ep);
	283	udev_monitor_unref(udev_monitor);
	284	udev_monitor_unref(kernel_monitor);
	285	udev_list_cleanup(&subsystem_match_list);
	286	udev_list_cleanup(&tag_match_list);
	287	return rc;
1bc33626	288	}
1985c76e KS	289
1985c76e KS	290	const struct udevadm_cmd udevadm_monitor = {
912541b0 KS	291	.name = "monitor",
	292	.cmd = adm_monitor,
	293	.help = "listen to kernel and udev events",
1985c76e	294	};