[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 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;

        static const struct option options[] = {
                { "property", no_argument, NULL, 'p' },
                { "environment", no_argument, NULL, 'e' },
                { "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);

        for (;;) {
                option = getopt_long(argc, argv, "pekus:t:h", options, NULL);
                if (option == -1)
                        break;

                switch (option) {
                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':
                        printf("Usage: udevadm monitor [--property] [--kernel] [--udev] [--help]\n"
                               "  --property                              print the event properties\n"
                               "  --kernel                                print kernel uevents\n"
                               "  --udev                                  print udev events\n"
                               "  --subsystem-match=<subsystem[/devtype]> filter events by subsystem\n"
                               "  --tag-match=<tag>                       filter events by tag\n"
                               "  --help\n\n");
                        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
1985c76e	67	static int adm_monitor(struct udev udev, int argc, char argv[])
1bc33626	68	{
9d458c09	69	struct sigaction act = {};
912541b0 KS	70	sigset_t mask;
	71	int option;
	72	bool prop = false;
	73	bool print_kernel = false;
	74	bool print_udev = false;
	75	struct udev_list subsystem_match_list;
	76	struct udev_list tag_match_list;
	77	struct udev_monitor *udev_monitor = NULL;
	78	struct udev_monitor *kernel_monitor = NULL;
	79	int fd_ep = -1;
	80	int fd_kernel = -1, fd_udev = -1;
	81	struct epoll_event ep_kernel, ep_udev;
	82	int rc = 0;
	83
	84	static const struct option options[] = {
	85	{ "property", no_argument, NULL, 'p' },
	86	{ "environment", no_argument, NULL, 'e' },
	87	{ "kernel", no_argument, NULL, 'k' },
	88	{ "udev", no_argument, NULL, 'u' },
	89	{ "subsystem-match", required_argument, NULL, 's' },
	90	{ "tag-match", required_argument, NULL, 't' },
	91	{ "help", no_argument, NULL, 'h' },
	92	{}
	93	};
	94
	95	udev_list_init(udev, &subsystem_match_list, true);
	96	udev_list_init(udev, &tag_match_list, true);
	97
	98	for (;;) {
	99	option = getopt_long(argc, argv, "pekus:t:h", options, NULL);
	100	if (option == -1)
	101	break;
	102
	103	switch (option) {
	104	case 'p':
	105	case 'e':
	106	prop = true;
	107	break;
	108	case 'k':
	109	print_kernel = true;
	110	break;
	111	case 'u':
	112	print_udev = true;
	113	break;
	114	case 's':
	115	{
	116	char subsys[UTIL_NAME_SIZE];
	117	char *devtype;
	118
d5a89d7d	119	strscpy(subsys, sizeof(subsys), optarg);
912541b0 KS	120	devtype = strchr(subsys, '/');
	121	if (devtype != NULL) {
	122	devtype[0] = '\0';
	123	devtype++;
	124	}
	125	udev_list_entry_add(&subsystem_match_list, subsys, devtype);
	126	break;
	127	}
	128	case 't':
	129	udev_list_entry_add(&tag_match_list, optarg, NULL);
	130	break;
	131	case 'h':
	132	printf("Usage: udevadm monitor [--property] [--kernel] [--udev] [--help]\n"
	133	" --property print the event properties\n"
	134	" --kernel print kernel uevents\n"
	135	" --udev print udev events\n"
	136	" --subsystem-match=<subsystem[/devtype]> filter events by subsystem\n"
	137	" --tag-match=<tag> filter events by tag\n"
	138	" --help\n\n");
	139	goto out;
	140	default:
	141	rc = 1;
	142	goto out;
	143	}
	144	}
	145
	146	if (!print_kernel && !print_udev) {
	147	print_kernel = true;
	148	print_udev = true;
	149	}
	150
	151	/* set signal handlers */
912541b0	152	act.sa_handler = sig_handler;
912541b0 KS	153	act.sa_flags = SA_RESTART;
	154	sigaction(SIGINT, &act, NULL);
	155	sigaction(SIGTERM, &act, NULL);
	156	sigemptyset(&mask);
	157	sigaddset(&mask, SIGINT);
	158	sigaddset(&mask, SIGTERM);
	159	sigprocmask(SIG_UNBLOCK, &mask, NULL);
	160
	161	fd_ep = epoll_create1(EPOLL_CLOEXEC);
	162	if (fd_ep < 0) {
baa30fbc	163	log_error("error creating epoll fd: %m\n");
912541b0 KS	164	goto out;
	165	}
	166
	167	printf("monitor will print the received events for:\n");
	168	if (print_udev) {
	169	struct udev_list_entry *entry;
	170
	171	udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
	172	if (udev_monitor == NULL) {
	173	fprintf(stderr, "error: unable to create netlink socket\n");
	174	rc = 1;
	175	goto out;
	176	}
	177	udev_monitor_set_receive_buffer_size(udev_monitor, 12810241024);
	178	fd_udev = udev_monitor_get_fd(udev_monitor);
	179
	180	udev_list_entry_foreach(entry, udev_list_get_entry(&subsystem_match_list)) {
	181	const char *subsys = udev_list_entry_get_name(entry);
	182	const char *devtype = udev_list_entry_get_value(entry);
	183
	184	if (udev_monitor_filter_add_match_subsystem_devtype(udev_monitor, subsys, devtype) < 0)
	185	fprintf(stderr, "error: unable to apply subsystem filter '%s'\n", subsys);
	186	}
	187
	188	udev_list_entry_foreach(entry, udev_list_get_entry(&tag_match_list)) {
	189	const char *tag = udev_list_entry_get_name(entry);
	190
	191	if (udev_monitor_filter_add_match_tag(udev_monitor, tag) < 0)
	192	fprintf(stderr, "error: unable to apply tag filter '%s'\n", tag);
	193	}
	194
	195	if (udev_monitor_enable_receiving(udev_monitor) < 0) {
	196	fprintf(stderr, "error: unable to subscribe to udev events\n");
	197	rc = 2;
	198	goto out;
	199	}
	200
	201	memset(&ep_udev, 0, sizeof(struct epoll_event));
	202	ep_udev.events = EPOLLIN;
	203	ep_udev.data.fd = fd_udev;
	204	if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_udev, &ep_udev) < 0) {
baa30fbc	205	log_error("fail to add fd to epoll: %m\n");
912541b0 KS	206	goto out;
	207	}
	208
	209	printf("UDEV - the event which udev sends out after rule processing\n");
	210	}
	211
	212	if (print_kernel) {
	213	struct udev_list_entry *entry;
	214
	215	kernel_monitor = udev_monitor_new_from_netlink(udev, "kernel");
	216	if (kernel_monitor == NULL) {
	217	fprintf(stderr, "error: unable to create netlink socket\n");
	218	rc = 3;
	219	goto out;
	220	}
	221	udev_monitor_set_receive_buffer_size(kernel_monitor, 12810241024);
	222	fd_kernel = udev_monitor_get_fd(kernel_monitor);
	223
	224	udev_list_entry_foreach(entry, udev_list_get_entry(&subsystem_match_list)) {
	225	const char *subsys = udev_list_entry_get_name(entry);
	226
	227	if (udev_monitor_filter_add_match_subsystem_devtype(kernel_monitor, subsys, NULL) < 0)
	228	fprintf(stderr, "error: unable to apply subsystem filter '%s'\n", subsys);
	229	}
	230
	231	if (udev_monitor_enable_receiving(kernel_monitor) < 0) {
	232	fprintf(stderr, "error: unable to subscribe to kernel events\n");
	233	rc = 4;
	234	goto out;
	235	}
	236
	237	memset(&ep_kernel, 0, sizeof(struct epoll_event));
	238	ep_kernel.events = EPOLLIN;
	239	ep_kernel.data.fd = fd_kernel;
	240	if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_kernel, &ep_kernel) < 0) {
baa30fbc	241	log_error("fail to add fd to epoll: %m\n");
912541b0 KS	242	goto out;
	243	}
	244
	245	printf("KERNEL - the kernel uevent\n");
	246	}
	247	printf("\n");
	248
	249	while (!udev_exit) {
	250	int fdcount;
	251	struct epoll_event ev[4];
	252	int i;
	253
8fef0ff2	254	fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), -1);
912541b0 KS	255	if (fdcount < 0) {
	256	if (errno != EINTR)
	257	fprintf(stderr, "error receiving uevent message: %m\n");
	258	continue;
	259	}
	260
	261	for (i = 0; i < fdcount; i++) {
	262	if (ev[i].data.fd == fd_kernel && ev[i].events & EPOLLIN) {
	263	struct udev_device *device;
	264
	265	device = udev_monitor_receive_device(kernel_monitor);
	266	if (device == NULL)
	267	continue;
	268	print_device(device, "KERNEL", prop);
	269	udev_device_unref(device);
	270	} else if (ev[i].data.fd == fd_udev && ev[i].events & EPOLLIN) {
	271	struct udev_device *device;
	272
	273	device = udev_monitor_receive_device(udev_monitor);
	274	if (device == NULL)
	275	continue;
	276	print_device(device, "UDEV", prop);
	277	udev_device_unref(device);
	278	}
	279	}
	280	}
40caaeec	281	out:
912541b0 KS	282	if (fd_ep >= 0)
	283	close(fd_ep);
	284	udev_monitor_unref(udev_monitor);
	285	udev_monitor_unref(kernel_monitor);
	286	udev_list_cleanup(&subsystem_match_list);
	287	udev_list_cleanup(&tag_match_list);
	288	return rc;
1bc33626	289	}
1985c76e KS	290
1985c76e KS	291	const struct udevadm_cmd udevadm_monitor = {
912541b0 KS	292	.name = "monitor",
	293	.cmd = adm_monitor,
	294	.help = "listen to kernel and udev events",
1985c76e	295	};