Systemd/udevcontrol.c

/*
 * Copyright (C) 2005-2006 Kay Sievers <kay.sievers@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 version 2 of the License.
 * 
 *	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 Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 */

#include <time.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <sys/un.h>

#include "udev.h"
#include "udevd.h"

static int sock = -1;
static int udev_log = 0;

int udevcontrol(int argc, char *argv[], char *envp[])
{
	static struct udevd_ctrl_msg ctrl_msg;
	struct sockaddr_un saddr;
	socklen_t addrlen;
	const char *env;
	const char *arg;
	const char *val;
	int *intval;
	int retval = 1;

	env = getenv("UDEV_LOG");
	if (env)
		udev_log = log_priority(env);

	logging_init("udevcontrol");
	dbg("version %s", UDEV_VERSION);

	if (argc < 2) {
		fprintf(stderr, "missing command\n\n");
		goto exit;
	}
	memset(&ctrl_msg, 0x00, sizeof(struct udevd_ctrl_msg));
	strcpy(ctrl_msg.magic, UDEVD_CTRL_MAGIC);
	arg = argv[1];

	/* allow instructions passed as options */
	if (strncmp(arg, "--", 2) == 0)
		arg += 2;

	if (!strcmp(arg, "stop_exec_queue"))
		ctrl_msg.type = UDEVD_CTRL_STOP_EXEC_QUEUE;
	else if (!strcmp(arg, "start_exec_queue"))
		ctrl_msg.type = UDEVD_CTRL_START_EXEC_QUEUE;
	else if (!strcmp(arg, "reload_rules"))
		ctrl_msg.type = UDEVD_CTRL_RELOAD_RULES;
	else if (!strncmp(arg, "log_priority=", strlen("log_priority="))) {
		intval = (int *) ctrl_msg.buf;
		val = &arg[strlen("log_priority=")];
		ctrl_msg.type = UDEVD_CTRL_SET_LOG_LEVEL;
		*intval = log_priority(val);
		info("send log_priority=%i", *intval);
	} else if (!strncmp(arg, "max_childs=", strlen("max_childs="))) {
		char *endp;
		int count;

		intval = (int *) ctrl_msg.buf;
		val = &arg[strlen("max_childs=")];
		ctrl_msg.type = UDEVD_CTRL_SET_MAX_CHILDS;
		count = strtoul(val, &endp, 0);
		if (endp[0] != '\0' || count < 1) {
			fprintf(stderr, "invalid number\n");
			goto exit;
		}
		*intval = count;
		info("send max_childs=%i", *intval);
	} else if (!strncmp(arg, "max_childs_running=", strlen("max_childs_running="))) {
		char *endp;
		int count;

		intval = (int *) ctrl_msg.buf;
		val = &arg[strlen("max_childs_running=")];
		ctrl_msg.type = UDEVD_CTRL_SET_MAX_CHILDS_RUNNING;
		count = strtoul(val, &endp, 0);
		if (endp[0] != '\0' || count < 1) {
			fprintf(stderr, "invalid number\n");
			goto exit;
		}
		*intval = count;
		info("send max_childs_running=%i", *intval);
	} else if (!strncmp(arg, "env", strlen("env"))) {
		val = argv[2];
		if (val == NULL) {
			fprintf(stderr, "missing key\n");
			goto exit;
		}
		ctrl_msg.type = UDEVD_CTRL_ENV;
		strlcpy(ctrl_msg.buf, val, sizeof(ctrl_msg.buf));
		info("send env '%s'", val);
	} else if (strcmp(arg, "help") == 0  || strcmp(arg, "-h") == 0) {
		printf("Usage: udevadm control COMMAND\n"
			"  --log_priority=<level>   set the udev log level for the daemon\n"
			"  --stop_exec_queue        keep udevd from executing events, queue only\n"
			"  --start_exec_queue       execute events, flush queue\n"
			"  --reload_rules           reloads the rules files\n"
			"  --env <var>=<value>      set a global environment variable\n"
			"  --max_childs=<N>         maximum number of childs\n"
			"  --max_childs_running=<N> maximum number of childs running at the same time\n"
			"  --help                   print this help text\n\n");
		goto exit;
	} else {
		fprintf(stderr, "unrecognized command '%s'\n", arg);
		goto exit;
	}

	if (getuid() != 0) {
		fprintf(stderr, "root privileges required\n");
		goto exit;
	}

	sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
	if (sock == -1) {
		err("error getting socket: %s", strerror(errno));
		goto exit;
	}

	memset(&saddr, 0x00, sizeof(struct sockaddr_un));
	saddr.sun_family = AF_LOCAL;
	/* use abstract namespace for socket path */
	strcpy(&saddr.sun_path[1], UDEVD_CTRL_SOCK_PATH);
	addrlen = offsetof(struct sockaddr_un, sun_path) + 1 + strlen(&saddr.sun_path[1]);

	retval = sendto(sock, &ctrl_msg, sizeof(ctrl_msg), 0, (struct sockaddr *)&saddr, addrlen);
	if (retval == -1) {
		err("error sending message: %s", strerror(errno));
		retval = 1;
	} else {
		dbg("sent message type=0x%02x, %u bytes sent", ctrl_msg.type, retval);
		retval = 0;
	}

	close(sock);
exit:
	logging_close();
	return retval;
}