[mirror_lxc.git] / src / lxc / lxc_start.c

/*
 * lxc: linux Container library
 *
 * (C) Copyright IBM Corp. 2007, 2008
 *
 * Authors:
 * Daniel Lezcano <daniel.lezcano at free.fr>
 *
 * 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
 */
#include "config.h"

#include <stdio.h>
#include <libgen.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/param.h>
#include <sys/utsname.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <net/if.h>

#include <lxc/lxccontainer.h>

#include "log.h"
#include "caps.h"
#include "lxc.h"
#include "conf.h"
#include "cgroup.h"
#include "utils.h"
#include "confile.h"
#include "arguments.h"

#define OPT_SHARE_NET OPT_USAGE+1
#define OPT_SHARE_IPC OPT_USAGE+2
#define OPT_SHARE_UTS OPT_USAGE+3

lxc_log_define(lxc_start_ui, lxc);

static struct lxc_list defines;

static int ensure_path(char **confpath, const char *path)
{
	int err = -1, fd;
	char *fullpath = NULL;

	if (path) {
		if (access(path, W_OK)) {
			fd = creat(path, 0600);
			if (fd < 0 && errno != EEXIST) {
				SYSERROR("failed to create '%s'", path);
				goto err;
			}
			if (fd >= 0)
				close(fd);
		}

		fullpath = realpath(path, NULL);
		if (!fullpath) {
			SYSERROR("failed to get the real path of '%s'", path);
			goto err;
		}

		*confpath = strdup(fullpath);
		if (!*confpath) {
			ERROR("failed to dup string '%s'", fullpath);
			goto err;
		}
	}
	err = 0;

err:
	if (fullpath)
		free(fullpath);
	return err;
}

static int pid_from_lxcname(const char *lxcname_or_pid, const char *lxcpath) {
	char *eptr;
	int pid = strtol(lxcname_or_pid, &eptr, 10);
	if (*eptr != '\0' || pid < 1) {
		struct lxc_container *s;
		s = lxc_container_new(lxcname_or_pid, lxcpath);
		if (!s) {
			SYSERROR("'%s' is not a valid pid nor a container name", lxcname_or_pid);
			return -1;
		}

		if (!s->may_control(s)) {
			SYSERROR("Insufficient privileges to control container '%s'", s->name);
			lxc_container_put(s);
			return -1;
		}

		pid = s->init_pid(s);
		if (pid < 1) {
			SYSERROR("Is container '%s' running?", s->name);
			lxc_container_put(s);
			return -1;
		}

		lxc_container_put(s);
	}
	if (kill(pid, 0) < 0) {
		SYSERROR("Can't send signal to pid %d", pid);
		return -1;
	}

	return pid;
}

static int open_ns(int pid, const char *ns_proc_name) {
	int fd;
	char path[MAXPATHLEN];
	snprintf(path, MAXPATHLEN, "/proc/%d/ns/%s", pid, ns_proc_name);

	fd = open(path, O_RDONLY);
	if (fd < 0) {
		SYSERROR("failed to open %s", path);
		return -1;
	}
	return fd;
}

static int my_parser(struct lxc_arguments* args, int c, char* arg)
{
	switch (c) {
	case 'c': args->console = arg; break;
	case 'L': args->console_log = arg; break;
	case 'd': args->daemonize = 1; break;
	case 'f': args->rcfile = arg; break;
	case 'C': args->close_all_fds = 1; break;
	case 's': return lxc_config_define_add(&defines, arg);
	case 'p': args->pidfile = arg; break;
	case OPT_SHARE_NET: args->share_ns[LXC_NS_NET] = arg; break;
	case OPT_SHARE_IPC: args->share_ns[LXC_NS_IPC] = arg; break;
	case OPT_SHARE_UTS: args->share_ns[LXC_NS_UTS] = arg; break;
	}
	return 0;
}

static const struct option my_longopts[] = {
	{"daemon", no_argument, 0, 'd'},
	{"rcfile", required_argument, 0, 'f'},
	{"define", required_argument, 0, 's'},
	{"console", required_argument, 0, 'c'},
	{"console-log", required_argument, 0, 'L'},
	{"close-all-fds", no_argument, 0, 'C'},
	{"pidfile", required_argument, 0, 'p'},
	{"share-net", required_argument, 0, OPT_SHARE_NET},
	{"share-ipc", required_argument, 0, OPT_SHARE_IPC},
	{"share-uts", required_argument, 0, OPT_SHARE_UTS},
	LXC_COMMON_OPTIONS
};

static struct lxc_arguments my_args = {
	.progname = "lxc-start",
	.help     = "\
--name=NAME -- COMMAND\n\
\n\
lxc-start start COMMAND in specified container NAME\n\
\n\
Options :\n\
  -n, --name=NAME        NAME for name of the container\n\
  -d, --daemon           daemonize the container\n\
  -p, --pidfile=FILE     Create a file with the process id\n\
  -f, --rcfile=FILE      Load configuration file FILE\n\
  -c, --console=FILE     Use specified FILE for the container console\n\
  -L, --console-log=FILE Log container console output to FILE\n\
  -C, --close-all-fds    If any fds are inherited, close them\n\
                         If not specified, exit with failure instead\n\
		         Note: --daemon implies --close-all-fds\n\
  -s, --define KEY=VAL   Assign VAL to configuration variable KEY\n\
      --share-[net|ipc|uts]=NAME Share a namespace with another container or pid\n\
",
	.options   = my_longopts,
	.parser    = my_parser,
	.checker   = NULL,
	.daemonize = 0,
	.pidfile = NULL,
};

int main(int argc, char *argv[])
{
	int err = 1;
	struct lxc_conf *conf;
	char *const *args;
	char *rcfile = NULL;
	char *const default_args[] = {
		"/sbin/init",
		NULL,
	};
	struct lxc_container *c;

	lxc_list_init(&defines);

	if (lxc_caps_init())
		return err;

	if (lxc_arguments_parse(&my_args, argc, argv))
		return err;

	if (!my_args.argc)
		args = default_args;
	else
		args = my_args.argv;

	if (lxc_log_init(my_args.name, my_args.log_file, my_args.log_priority,
			 my_args.progname, my_args.quiet, my_args.lxcpath[0]))
		return err;
	lxc_log_options_no_override();

	const char *lxcpath = my_args.lxcpath[0];

	/*
	 * rcfile possibilities:
	 * 1. rcfile from random path specified in cli option
	 * 2. rcfile not specified, use $lxcpath/$lxcname/config
	 * 3. rcfile not specified and does not exist.
	 */
	/* rcfile is specified in the cli option */
	if (my_args.rcfile) {
		rcfile = (char *)my_args.rcfile;
		c = lxc_container_new(my_args.name, lxcpath);
		if (!c) {
			ERROR("Failed to create lxc_container");
			return err;
		}
		c->clear_config(c);
		if (!c->load_config(c, rcfile)) {
			ERROR("Failed to load rcfile");
			lxc_container_put(c);
			return err;
		}
	} else {
		int rc;

		rc = asprintf(&rcfile, "%s/%s/config", lxcpath, my_args.name);
		if (rc == -1) {
			SYSERROR("failed to allocate memory");
			return err;
		}
		INFO("using rcfile %s", rcfile);

		/* container configuration does not exist */
		if (access(rcfile, F_OK)) {
			free(rcfile);
			rcfile = NULL;
		}
		c = lxc_container_new(my_args.name, lxcpath);
		if (!c) {
			ERROR("Failed to create lxc_container");
			return err;
		}
	}

	/*
	 * We should use set_config_item() over &defines, which would handle
	 * unset c->lxc_conf for us and let us not use lxc_config_define_load()
	 */
	if (!c->lxc_conf)
		c->lxc_conf = lxc_conf_init();
	conf = c->lxc_conf;

	if (lxc_config_define_load(&defines, conf))
		goto out;

	if (!rcfile && !strcmp("/sbin/init", args[0])) {
		ERROR("Executing '/sbin/init' with no configuration file may crash the host");
		goto out;
	}

	if (ensure_path(&conf->console.path, my_args.console) < 0) {
		ERROR("failed to ensure console path '%s'", my_args.console);
		goto out;
	}

	if (ensure_path(&conf->console.log_path, my_args.console_log) < 0) {
		ERROR("failed to ensure console log '%s'", my_args.console_log);
		goto out;
	}

	if (my_args.pidfile != NULL) {
		if (ensure_path(&c->pidfile, my_args.pidfile) < 0) {
			ERROR("failed to ensure pidfile '%s'", my_args.pidfile);
			goto out;
		}
	}

	int i;
	for (i = 0; i < LXC_NS_MAX; i++) {
		if (my_args.share_ns[i] == NULL)
			continue;

		int pid = pid_from_lxcname(my_args.share_ns[i], lxcpath);
		if (pid < 1)
			goto out;

		int fd = open_ns(pid, ns_info[i].proc_name);
		if (fd < 0)
			goto out;
		conf->inherit_ns_fd[i] = fd;
	}

	if (!my_args.daemonize) {
		c->want_daemonize(c, false);
	}

	if (my_args.close_all_fds)
		c->want_close_all_fds(c, true);

	err = c->start(c, 0, args) ? 0 : 1;
out:
	lxc_container_put(c);
	return err;
}
Commit	Line	Data
5e97c3fc	1	/*
	2	* lxc: linux Container library
	3	*
	4	* (C) Copyright IBM Corp. 2007, 2008
	5	*
	6	* Authors:
9afe19d6	7	* Daniel Lezcano <daniel.lezcano at free.fr>
5e97c3fc	8	*
	9	* This library is free software; you can redistribute it and/or
	10	* modify it under the terms of the GNU Lesser General Public
	11	* License as published by the Free Software Foundation; either
	12	* version 2.1 of the License, or (at your option) any later version.
	13	*
	14	* This library is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	17	* Lesser General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU Lesser General Public
	20	* License along with this library; if not, write to the Free Software
250b1eec	21	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
5e97c3fc	22	*/
d06245b8 NC	23	#include "config.h"
d06245b8 NC	24
5e97c3fc	25	#include <stdio.h>
5e97c3fc	26	#include <libgen.h>
96c210bb	27	#include <stdlib.h>
5e97c3fc	28	#include <unistd.h>
5e97c3fc	29	#include <string.h>
b0a33c1e	30	#include <errno.h>
c36583c3	31	#include <fcntl.h>
f8e09a0b	32	#include <signal.h>
5e97c3fc	33	#include <sys/param.h>
	34	#include <sys/utsname.h>
	35	#include <sys/types.h>
	36	#include <sys/socket.h>
c36583c3	37	#include <sys/stat.h>
5e97c3fc	38	#include <arpa/inet.h>
	39	#include <netinet/in.h>
	40	#include <net/if.h>
	41
f2363e38 ÇO	42	#include <lxc/lxccontainer.h>
f2363e38 ÇO	43
fae349da	44	#include "log.h"
0ed9cc8b	45	#include "caps.h"
fae349da DL	46	#include "lxc.h"
fae349da DL	47	#include "conf.h"
63376d7d	48	#include "cgroup.h"
fae349da	49	#include "utils.h"
fae349da DL	50	#include "confile.h"
fae349da DL	51	#include "arguments.h"
36eb9bde	52
9f30a190	53	#define OPT_SHARE_NET OPT_USAGE+1
3c93577b	54	#define OPT_SHARE_IPC OPT_USAGE+2
6c544cb3	55	#define OPT_SHARE_UTS OPT_USAGE+3
9f30a190	56
6ea518f6	57	lxc_log_define(lxc_start_ui, lxc);
5e97c3fc	58
33ba4ad7 CLG	59	static struct lxc_list defines;
33ba4ad7 CLG	60
596a818d DE	61	static int ensure_path(char *confpath, const char path)
	62	{
	63	int err = -1, fd;
	64	char *fullpath = NULL;
	65
	66	if (path) {
	67	if (access(path, W_OK)) {
	68	fd = creat(path, 0600);
84bdfb2b	69	if (fd < 0 && errno != EEXIST) {
596a818d DE	70	SYSERROR("failed to create '%s'", path);
	71	goto err;
	72	}
84bdfb2b SH	73	if (fd >= 0)
84bdfb2b SH	74	close(fd);
596a818d DE	75	}
	76
	77	fullpath = realpath(path, NULL);
	78	if (!fullpath) {
	79	SYSERROR("failed to get the real path of '%s'", path);
	80	goto err;
	81	}
	82
	83	*confpath = strdup(fullpath);
	84	if (!*confpath) {
	85	ERROR("failed to dup string '%s'", fullpath);
	86	goto err;
	87	}
	88	}
	89	err = 0;
	90
	91	err:
	92	if (fullpath)
	93	free(fullpath);
	94	return err;
	95	}
	96
02b4f2e1 MM	97	static int pid_from_lxcname(const char lxcname_or_pid, const char lxcpath) {
	98	char *eptr;
	99	int pid = strtol(lxcname_or_pid, &eptr, 10);
	100	if (*eptr != '\0' \|\| pid < 1) {
	101	struct lxc_container *s;
	102	s = lxc_container_new(lxcname_or_pid, lxcpath);
	103	if (!s) {
	104	SYSERROR("'%s' is not a valid pid nor a container name", lxcname_or_pid);
	105	return -1;
	106	}
	107
	108	if (!s->may_control(s)) {
	109	SYSERROR("Insufficient privileges to control container '%s'", s->name);
f8059880	110	lxc_container_put(s);
02b4f2e1 MM	111	return -1;
	112	}
	113
	114	pid = s->init_pid(s);
	115	if (pid < 1) {
	116	SYSERROR("Is container '%s' running?", s->name);
f8059880	117	lxc_container_put(s);
02b4f2e1 MM	118	return -1;
02b4f2e1 MM	119	}
f8059880 MM	120
f8059880 MM	121	lxc_container_put(s);
02b4f2e1 MM	122	}
	123	if (kill(pid, 0) < 0) {
	124	SYSERROR("Can't send signal to pid %d", pid);
	125	return -1;
	126	}
f8059880	127
02b4f2e1 MM	128	return pid;
	129	}
	130
	131	static int open_ns(int pid, const char *ns_proc_name) {
	132	int fd;
	133	char path[MAXPATHLEN];
f8059880	134	snprintf(path, MAXPATHLEN, "/proc/%d/ns/%s", pid, ns_proc_name);
02b4f2e1 MM	135
	136	fd = open(path, O_RDONLY);
	137	if (fd < 0) {
	138	SYSERROR("failed to open %s", path);
	139	return -1;
	140	}
	141	return fd;
	142	}
	143
c36583c3 DL	144	static int my_parser(struct lxc_arguments* args, int c, char* arg)
	145	{
	146	switch (c) {
829dd918	147	case 'c': args->console = arg; break;
596a818d	148	case 'L': args->console_log = arg; break;
83758ed0	149	case 'd': args->daemonize = 1; break;
48862401	150	case 'f': args->rcfile = arg; break;
b119f362	151	case 'C': args->close_all_fds = 1; break;
33ba4ad7	152	case 's': return lxc_config_define_add(&defines, arg);
3114c982	153	case 'p': args->pidfile = arg; break;
46926165 MM	154	case OPT_SHARE_NET: args->share_ns[LXC_NS_NET] = arg; break;
46926165 MM	155	case OPT_SHARE_IPC: args->share_ns[LXC_NS_IPC] = arg; break;
6c544cb3	156	case OPT_SHARE_UTS: args->share_ns[LXC_NS_UTS] = arg; break;
c36583c3 DL	157	}
	158	return 0;
	159	}
	160
9618063c	161	static const struct option my_longopts[] = {
c36583c3	162	{"daemon", no_argument, 0, 'd'},
48862401	163	{"rcfile", required_argument, 0, 'f'},
33ba4ad7	164	{"define", required_argument, 0, 's'},
829dd918	165	{"console", required_argument, 0, 'c'},
596a818d	166	{"console-log", required_argument, 0, 'L'},
b119f362	167	{"close-all-fds", no_argument, 0, 'C'},
3114c982	168	{"pidfile", required_argument, 0, 'p'},
9f30a190	169	{"share-net", required_argument, 0, OPT_SHARE_NET},
3c93577b	170	{"share-ipc", required_argument, 0, OPT_SHARE_IPC},
6c544cb3	171	{"share-uts", required_argument, 0, OPT_SHARE_UTS},
9618063c MN	172	LXC_COMMON_OPTIONS
	173	};
	174
	175	static struct lxc_arguments my_args = {
	176	.progname = "lxc-start",
	177	.help = "\
	178	--name=NAME -- COMMAND\n\
	179	\n\
	180	lxc-start start COMMAND in specified container NAME\n\
	181	\n\
	182	Options :\n\
596a818d DE	183	-n, --name=NAME NAME for name of the container\n\
	184	-d, --daemon daemonize the container\n\
	185	-p, --pidfile=FILE Create a file with the process id\n\
	186	-f, --rcfile=FILE Load configuration file FILE\n\
	187	-c, --console=FILE Use specified FILE for the container console\n\
	188	-L, --console-log=FILE Log container console output to FILE\n\
	189	-C, --close-all-fds If any fds are inherited, close them\n\
	190	If not specified, exit with failure instead\n\
	191	Note: --daemon implies --close-all-fds\n\
9f30a190	192	-s, --define KEY=VAL Assign VAL to configuration variable KEY\n\
304dc8b3	193	--share-[net\|ipc\|uts]=NAME Share a namespace with another container or pid\n\
9f30a190	194	",
c36583c3 DL	195	.options = my_longopts,
	196	.parser = my_parser,
	197	.checker = NULL,
	198	.daemonize = 0,
3114c982	199	.pidfile = NULL,
9618063c	200	};
5e97c3fc	201
	202	int main(int argc, char *argv[])
	203	{
a7440c15	204	int err = 1;
91480a0f DL	205	struct lxc_conf *conf;
	206	char const args;
	207	char *rcfile = NULL;
9618063c	208	char *const default_args[] = {
b2b6c597	209	"/sbin/init",
13aad0ae	210	NULL,
b2b6c597	211	};
79622932	212	struct lxc_container *c;
5e97c3fc	213
33ba4ad7 CLG	214	lxc_list_init(&defines);
33ba4ad7 CLG	215
0ed9cc8b DL	216	if (lxc_caps_init())
	217	return err;
	218
e043236e MN	219	if (lxc_arguments_parse(&my_args, argc, argv))
e043236e MN	220	return err;
5e97c3fc	221
9618063c	222	if (!my_args.argc)
f79d43bb	223	args = default_args;
9618063c MN	224	else
9618063c MN	225	args = my_args.argv;
5e97c3fc	226
5e1e7aaf	227	if (lxc_log_init(my_args.name, my_args.log_file, my_args.log_priority,
8d06bd13	228	my_args.progname, my_args.quiet, my_args.lxcpath[0]))
e043236e	229	return err;
6edbfc86	230	lxc_log_options_no_override();
51cab631	231
69733b5d SH	232	const char *lxcpath = my_args.lxcpath[0];
69733b5d SH	233
79622932 SH	234	/*
	235	* rcfile possibilities:
	236	* 1. rcfile from random path specified in cli option
	237	* 2. rcfile not specified, use $lxcpath/$lxcname/config
	238	* 3. rcfile not specified and does not exist.
	239	*/
96c210bb	240	/* rcfile is specified in the cli option */
79622932	241	if (my_args.rcfile) {
96c210bb	242	rcfile = (char *)my_args.rcfile;
69733b5d	243	c = lxc_container_new(my_args.name, lxcpath);
79622932 SH	244	if (!c) {
	245	ERROR("Failed to create lxc_container");
	246	return err;
	247	}
4df7f012	248	c->clear_config(c);
79622932 SH	249	if (!c->load_config(c, rcfile)) {
	250	ERROR("Failed to load rcfile");
	251	lxc_container_put(c);
	252	return err;
	253	}
	254	} else {
fa9ab205 NL	255	int rc;
fa9ab205 NL	256
79622932	257	rc = asprintf(&rcfile, "%s/%s/config", lxcpath, my_args.name);
fa9ab205	258	if (rc == -1) {
96c210bb DL	259	SYSERROR("failed to allocate memory");
	260	return err;
	261	}
444f3ca2	262	INFO("using rcfile %s", rcfile);
96c210bb DL	263
	264	/* container configuration does not exist */
	265	if (access(rcfile, F_OK)) {
	266	free(rcfile);
	267	rcfile = NULL;
79622932 SH	268	}
	269	c = lxc_container_new(my_args.name, lxcpath);
	270	if (!c) {
	271	ERROR("Failed to create lxc_container");
	272	return err;
96c210bb DL	273	}
	274	}
	275
79622932 SH	276	/*
	277	* We should use set_config_item() over &defines, which would handle
	278	* unset c->lxc_conf for us and let us not use lxc_config_define_load()
	279	*/
	280	if (!c->lxc_conf)
	281	c->lxc_conf = lxc_conf_init();
	282	conf = c->lxc_conf;
fae349da	283
33ba4ad7	284	if (lxc_config_define_load(&defines, conf))
2d4bcb96	285	goto out;
33ba4ad7	286
f2ae79a0	287	if (!rcfile && !strcmp("/sbin/init", args[0])) {
79622932	288	ERROR("Executing '/sbin/init' with no configuration file may crash the host");
2d4bcb96	289	goto out;
f2ae79a0 AN	290	}
f2ae79a0 AN	291
596a818d DE	292	if (ensure_path(&conf->console.path, my_args.console) < 0) {
596a818d DE	293	ERROR("failed to ensure console path '%s'", my_args.console);
2d4bcb96	294	goto out;
596a818d	295	}
829dd918	296
596a818d DE	297	if (ensure_path(&conf->console.log_path, my_args.console_log) < 0) {
596a818d DE	298	ERROR("failed to ensure console log '%s'", my_args.console_log);
2d4bcb96	299	goto out;
829dd918 DL	300	}
829dd918 DL	301
3114c982	302	if (my_args.pidfile != NULL) {
72cf75fa QH	303	if (ensure_path(&c->pidfile, my_args.pidfile) < 0) {
	304	ERROR("failed to ensure pidfile '%s'", my_args.pidfile);
	305	goto out;
	306	}
3114c982 NC	307	}
3114c982 NC	308
46926165 MM	309	int i;
	310	for (i = 0; i < LXC_NS_MAX; i++) {
	311	if (my_args.share_ns[i] == NULL)
	312	continue;
9f30a190	313
46926165	314	int pid = pid_from_lxcname(my_args.share_ns[i], lxcpath);
3c93577b MM	315	if (pid < 1)
	316	goto out;
	317
46926165	318	int fd = open_ns(pid, ns_info[i].proc_name);
3c93577b MM	319	if (fd < 0)
3c93577b MM	320	goto out;
46926165	321	conf->inherit_ns_fd[i] = fd;
3c93577b MM	322	}
3c93577b MM	323
c8ad5f46 SH	324	if (!my_args.daemonize) {
c8ad5f46 SH	325	c->want_daemonize(c, false);
c36583c3 DL	326	}
c36583c3 DL	327
b119f362	328	if (my_args.close_all_fds)
540f932a	329	c->want_close_all_fds(c, true);
b119f362	330
a7440c15	331	err = c->start(c, 0, args) ? 0 : 1;
2d4bcb96	332	out:
79622932	333	lxc_container_put(c);
b0a33c1e	334	return err;
5e97c3fc	335	}
5e97c3fc	336