busybox/debianutils/start_stop_daemon.c

/* vi: set sw=4 ts=4: */
/*
 * Mini start-stop-daemon implementation(s) for busybox
 *
 * Written by Marek Michalkiewicz <marekm@i17linuxb.ists.pwr.wroc.pl>,
 * Adapted for busybox David Kimdon <dwhedon@gordian.com>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */

#include "busybox.h"
#include <getopt.h>
#include <sys/resource.h>

static int signal_nr = 15;
static int user_id = -1;
static int quiet;
static char *userspec;
static char *chuid;
static char *cmdname;
static char *execname;
static char *pidfile;

struct pid_list {
	struct pid_list *next;
	pid_t pid;
};

static struct pid_list *found;

static inline void push(pid_t pid)
{
	struct pid_list *p;

	p = xmalloc(sizeof(*p));
	p->next = found;
	p->pid = pid;
	found = p;
}

static int pid_is_exec(pid_t pid, const char *name)
{
	char buf[sizeof("/proc//exe") + sizeof(int)*3];
	char *execbuf;
	int sz;
	int equal;

	sprintf(buf, "/proc/%d/exe", pid);
	sz = strlen(name) + 1;
	execbuf = xzalloc(sz);
	readlink(buf, execbuf, sz);

	/* if readlink fails, execbuf still contains "" */
	equal = !strcmp(execbuf, name);
	if (ENABLE_FEATURE_CLEAN_UP)
		free(execbuf);
	return equal;
}

static int pid_is_user(int pid, int uid)
{
	struct stat sb;
	char buf[sizeof("/proc/") + sizeof(int)*3];

	sprintf(buf, "/proc/%u", pid);
	if (stat(buf, &sb) != 0)
		return 0;
	return (sb.st_uid == uid);
}

static int pid_is_cmd(pid_t pid, const char *name)
{
	char fname[sizeof("/proc//stat") + sizeof(int)*3];
	char *buf;
	int r = 0;

	sprintf(fname, "/proc/%u/stat", pid);
	buf = xmalloc_open_read_close(fname, NULL);
	if (buf) {
		char *p = strchr(buf, '(');
		if (p) {
			char *pe = strrchr(++p, ')');
			if (pe) {
				*pe = '\0';
				r = !strcmp(p, name);
			}
		}
		free(buf);
	}
	return r;
}


static void check(int pid)
{
	if (execname && !pid_is_exec(pid, execname)) {
		return;
	}
	if (userspec && !pid_is_user(pid, user_id)) {
		return;
	}
	if (cmdname && !pid_is_cmd(pid, cmdname)) {
		return;
	}
	push(pid);
}


static void do_pidfile(void)
{
	FILE *f;
	pid_t pid;

	f = fopen(pidfile, "r");
	if (f) {
		if (fscanf(f, "%u", &pid) == 1)
			check(pid);
		fclose(f);
	} else if (errno != ENOENT)
		bb_perror_msg_and_die("open pidfile %s", pidfile);
}

static void do_procinit(void)
{
	DIR *procdir;
	struct dirent *entry;
	int foundany, pid;

	if (pidfile) {
		do_pidfile();
		return;
	}

	procdir = xopendir("/proc");

	foundany = 0;
	while ((entry = readdir(procdir)) != NULL) {
		pid = bb_strtou(entry->d_name, NULL, 10);
		if (errno)
			continue;
		foundany++;
		check(pid);
	}
	closedir(procdir);
	if (!foundany)
		bb_error_msg_and_die ("nothing in /proc - not mounted?");
}


static int do_stop(void)
{
	char *what;
	struct pid_list *p;
	int killed = 0;

	do_procinit();

	if (cmdname)
		what = xstrdup(cmdname);
	else if (execname)
		what = xstrdup(execname);
	else if (pidfile)
		what = xasprintf("process in pidfile '%s'", pidfile);
	else if (userspec)
		what = xasprintf("process(es) owned by '%s'", userspec);
	else
		bb_error_msg_and_die("internal error, please report");

	if (!found) {
		if (!quiet)
			printf("no %s found; none killed\n", what);
		if (ENABLE_FEATURE_CLEAN_UP)
			free(what);
		return -1;
	}
	for (p = found; p; p = p->next) {
		if (kill(p->pid, signal_nr) == 0) {
			p->pid = -p->pid;
			killed++;
		} else {
			bb_perror_msg("warning: failed to kill %d", p->pid);
		}
	}
	if (!quiet && killed) {
		printf("stopped %s (pid", what);
		for (p = found; p; p = p->next)
			if(p->pid < 0)
				printf(" %d", -p->pid);
		puts(")");
	}
	if (ENABLE_FEATURE_CLEAN_UP)
		free(what);
	return killed;
}

#if ENABLE_FEATURE_START_STOP_DAEMON_LONG_OPTIONS
static const struct option long_options[] = {
	{ "stop",               0,      NULL,   'K' },
	{ "start",              0,      NULL,   'S' },
	{ "background",         0,      NULL,   'b' },
	{ "quiet",              0,      NULL,   'q' },
	{ "make-pidfile",       0,      NULL,   'm' },
#if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
	{ "oknodo",             0,      NULL,   'o' },
	{ "verbose",            0,      NULL,   'v' },
	{ "nicelevel",          1,      NULL,   'N' },
#endif
	{ "startas",            1,      NULL,   'a' },
	{ "name",               1,      NULL,   'n' },
	{ "signal",             1,      NULL,   's' },
	{ "user",               1,      NULL,   'u' },
	{ "chuid",              1,      NULL,   'c' },
	{ "exec",               1,      NULL,   'x' },
	{ "pidfile",            1,      NULL,   'p' },
#if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
	{ "retry",              1,      NULL,   'R' },
#endif
	{ 0,                    0,      0,      0 }
};
#endif

enum {
	CTX_STOP       = 0x1,
	CTX_START      = 0x2,
	OPT_BACKGROUND = 0x4,
	OPT_QUIET      = 0x8,
	OPT_MAKEPID    = 0x10,
	OPT_OKNODO     = 0x20 * ENABLE_FEATURE_START_STOP_DAEMON_FANCY,
	OPT_VERBOSE    = 0x40 * ENABLE_FEATURE_START_STOP_DAEMON_FANCY,
	OPT_NICELEVEL  = 0x80 * ENABLE_FEATURE_START_STOP_DAEMON_FANCY,
};

int start_stop_daemon_main(int argc, char **argv)
{
	unsigned opt;
	char *signame = NULL;
	char *startas = NULL;
#if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
//	char *retry_arg = NULL;
//	int retries = -1;
	char *opt_N;
#endif
#if ENABLE_FEATURE_START_STOP_DAEMON_LONG_OPTIONS
	applet_long_options = long_options;
#endif

	/* Check required one context option was given */
	opt_complementary = "K:S:?:K--S:S--K:m?p:K?xpun:S?xa";
	opt = getopt32(argc, argv, "KSbqm"
//		USE_FEATURE_START_STOP_DAEMON_FANCY("ovN:R:")
		USE_FEATURE_START_STOP_DAEMON_FANCY("ovN:")
		"a:n:s:u:c:x:p:"
		USE_FEATURE_START_STOP_DAEMON_FANCY(,&opt_N)
//		USE_FEATURE_START_STOP_DAEMON_FANCY(,&retry_arg)
		,&startas, &cmdname, &signame, &userspec, &chuid, &execname, &pidfile);

	quiet = (opt & OPT_QUIET) && !(opt & OPT_VERBOSE);

	if (signame) {
		signal_nr = get_signum(signame);
		if (signal_nr < 0) bb_show_usage();
	}

	if (!startas)
		startas = execname;

//	USE_FEATURE_START_STOP_DAEMON_FANCY(
//		if (retry_arg)
//			retries = xatoi_u(retry_arg);
//	)
	argc -= optind;
	argv += optind;

	if (userspec) {
		user_id = bb_strtou(userspec, NULL, 10);
		if (errno)
			user_id = xuname2uid(userspec);
	}

	if (opt & CTX_STOP) {
		int i = do_stop();
		return (opt & OPT_OKNODO) ? 0 : (i<=0);
	}

	do_procinit();

	if (found) {
		if (!quiet)
			printf("%s already running\n%d\n", execname, found->pid);
		return !(opt & OPT_OKNODO);
	}
	*--argv = startas;
	if (opt & OPT_BACKGROUND) {
		setsid();
		bb_daemonize();
	}
	if (opt & OPT_MAKEPID) {
		/* user wants _us_ to make the pidfile */
		FILE *pidf = xfopen(pidfile, "w");

		pid_t pidt = getpid();
		fprintf(pidf, "%d\n", pidt);
		fclose(pidf);
	}
	if (chuid) {
		user_id = bb_strtou(chuid, NULL, 10);
		if (errno)
			user_id = xuname2uid(chuid);
		xsetuid(user_id);
	}
#if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
	if (opt & OPT_NICELEVEL) {
		/* Set process priority */
		int prio = getpriority(PRIO_PROCESS, 0) + xatoi_range(opt_N, INT_MIN/2, INT_MAX/2);
		if (setpriority(PRIO_PROCESS, 0, prio) < 0) {
			bb_perror_msg_and_die("setpriority(%d)", prio);
		}
	}
#endif
	execv(startas, argv);
	bb_perror_msg_and_die("cannot start %s", startas);
}
1	/* vi: set sw=4 ts=4: */
2	/*
3	* Mini start-stop-daemon implementation(s) for busybox
4	*
5	* Written by Marek Michalkiewicz <marekm@i17linuxb.ists.pwr.wroc.pl>,
6	* Adapted for busybox David Kimdon <dwhedon@gordian.com>
7	*
8	* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
9	*/
10
11	#include "busybox.h"
12	#include <getopt.h>
13	#include <sys/resource.h>
14
15	static int signal_nr = 15;
16	static int user_id = -1;
17	static int quiet;
18	static char *userspec;
19	static char *chuid;
20	static char *cmdname;
21	static char *execname;
22	static char *pidfile;
23
24	struct pid_list {
25	struct pid_list *next;
26	pid_t pid;
27	};
28
29	static struct pid_list *found;
30
31	static inline void push(pid_t pid)
32	{
33	struct pid_list *p;
34
35	p = xmalloc(sizeof(*p));
36	p->next = found;
37	p->pid = pid;
38	found = p;
39	}
40
41	static int pid_is_exec(pid_t pid, const char *name)
42	{
43	char buf[sizeof("/proc//exe") + sizeof(int)*3];
44	char *execbuf;
45	int sz;
46	int equal;
47
48	sprintf(buf, "/proc/%d/exe", pid);
49	sz = strlen(name) + 1;
50	execbuf = xzalloc(sz);
51	readlink(buf, execbuf, sz);
52
53	/* if readlink fails, execbuf still contains "" */
54	equal = !strcmp(execbuf, name);
55	if (ENABLE_FEATURE_CLEAN_UP)
56	free(execbuf);
57	return equal;
58	}
59
60	static int pid_is_user(int pid, int uid)
61	{
62	struct stat sb;
63	char buf[sizeof("/proc/") + sizeof(int)*3];
64
65	sprintf(buf, "/proc/%u", pid);
66	if (stat(buf, &sb) != 0)
67	return 0;
68	return (sb.st_uid == uid);
69	}
70
71	static int pid_is_cmd(pid_t pid, const char *name)
72	{
73	char fname[sizeof("/proc//stat") + sizeof(int)*3];
74	char *buf;
75	int r = 0;
76
77	sprintf(fname, "/proc/%u/stat", pid);
78	buf = xmalloc_open_read_close(fname, NULL);
79	if (buf) {
80	char *p = strchr(buf, '(');
81	if (p) {
82	char *pe = strrchr(++p, ')');
83	if (pe) {
84	*pe = '\0';
85	r = !strcmp(p, name);
86	}
87	}
88	free(buf);
89	}
90	return r;
91	}
92
93
94	static void check(int pid)
95	{
96	if (execname && !pid_is_exec(pid, execname)) {
97	return;
98	}
99	if (userspec && !pid_is_user(pid, user_id)) {
100	return;
101	}
102	if (cmdname && !pid_is_cmd(pid, cmdname)) {
103	return;
104	}
105	push(pid);
106	}
107
108
109	static void do_pidfile(void)
110	{
111	FILE *f;
112	pid_t pid;
113
114	f = fopen(pidfile, "r");
115	if (f) {
116	if (fscanf(f, "%u", &pid) == 1)
117	check(pid);
118	fclose(f);
119	} else if (errno != ENOENT)
120	bb_perror_msg_and_die("open pidfile %s", pidfile);
121	}
122
123	static void do_procinit(void)
124	{
125	DIR *procdir;
126	struct dirent *entry;
127	int foundany, pid;
128
129	if (pidfile) {
130	do_pidfile();
131	return;
132	}
133
134	procdir = xopendir("/proc");
135
136	foundany = 0;
137	while ((entry = readdir(procdir)) != NULL) {
138	pid = bb_strtou(entry->d_name, NULL, 10);
139	if (errno)
140	continue;
141	foundany++;
142	check(pid);
143	}
144	closedir(procdir);
145	if (!foundany)
146	bb_error_msg_and_die ("nothing in /proc - not mounted?");
147	}
148
149
150	static int do_stop(void)
151	{
152	char *what;
153	struct pid_list *p;
154	int killed = 0;
155
156	do_procinit();
157
158	if (cmdname)
159	what = xstrdup(cmdname);
160	else if (execname)
161	what = xstrdup(execname);
162	else if (pidfile)
163	what = xasprintf("process in pidfile '%s'", pidfile);
164	else if (userspec)
165	what = xasprintf("process(es) owned by '%s'", userspec);
166	else
167	bb_error_msg_and_die("internal error, please report");
168
169	if (!found) {
170	if (!quiet)
171	printf("no %s found; none killed\n", what);
172	if (ENABLE_FEATURE_CLEAN_UP)
173	free(what);
174	return -1;
175	}
176	for (p = found; p; p = p->next) {
177	if (kill(p->pid, signal_nr) == 0) {
178	p->pid = -p->pid;
179	killed++;
180	} else {
181	bb_perror_msg("warning: failed to kill %d", p->pid);
182	}
183	}
184	if (!quiet && killed) {
185	printf("stopped %s (pid", what);
186	for (p = found; p; p = p->next)
187	if(p->pid < 0)
188	printf(" %d", -p->pid);
189	puts(")");
190	}
191	if (ENABLE_FEATURE_CLEAN_UP)
192	free(what);
193	return killed;
194	}
195
196	#if ENABLE_FEATURE_START_STOP_DAEMON_LONG_OPTIONS
197	static const struct option long_options[] = {
198	{ "stop", 0, NULL, 'K' },
199	{ "start", 0, NULL, 'S' },
200	{ "background", 0, NULL, 'b' },
201	{ "quiet", 0, NULL, 'q' },
202	{ "make-pidfile", 0, NULL, 'm' },
203	#if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
204	{ "oknodo", 0, NULL, 'o' },
205	{ "verbose", 0, NULL, 'v' },
206	{ "nicelevel", 1, NULL, 'N' },
207	#endif
208	{ "startas", 1, NULL, 'a' },
209	{ "name", 1, NULL, 'n' },
210	{ "signal", 1, NULL, 's' },
211	{ "user", 1, NULL, 'u' },
212	{ "chuid", 1, NULL, 'c' },
213	{ "exec", 1, NULL, 'x' },
214	{ "pidfile", 1, NULL, 'p' },
215	#if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
216	{ "retry", 1, NULL, 'R' },
217	#endif
218	{ 0, 0, 0, 0 }
219	};
220	#endif
221
222	enum {
223	CTX_STOP = 0x1,
224	CTX_START = 0x2,
225	OPT_BACKGROUND = 0x4,
226	OPT_QUIET = 0x8,
227	OPT_MAKEPID = 0x10,
228	OPT_OKNODO = 0x20 * ENABLE_FEATURE_START_STOP_DAEMON_FANCY,
229	OPT_VERBOSE = 0x40 * ENABLE_FEATURE_START_STOP_DAEMON_FANCY,
230	OPT_NICELEVEL = 0x80 * ENABLE_FEATURE_START_STOP_DAEMON_FANCY,
231	};
232
233	int start_stop_daemon_main(int argc, char **argv)
234	{
235	unsigned opt;
236	char *signame = NULL;
237	char *startas = NULL;
238	#if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
239	// char *retry_arg = NULL;
240	// int retries = -1;
241	char *opt_N;
242	#endif
243	#if ENABLE_FEATURE_START_STOP_DAEMON_LONG_OPTIONS
244	applet_long_options = long_options;
245	#endif
246
247	/* Check required one context option was given */
248	opt_complementary = "K:S:?:K--S:S--K:m?p:K?xpun:S?xa";
249	opt = getopt32(argc, argv, "KSbqm"
250	// USE_FEATURE_START_STOP_DAEMON_FANCY("ovN:R:")
251	USE_FEATURE_START_STOP_DAEMON_FANCY("ovN:")
252	"a:n:s:u:c:x:p:"
253	USE_FEATURE_START_STOP_DAEMON_FANCY(,&opt_N)
254	// USE_FEATURE_START_STOP_DAEMON_FANCY(,&retry_arg)
255	,&startas, &cmdname, &signame, &userspec, &chuid, &execname, &pidfile);
256
257	quiet = (opt & OPT_QUIET) && !(opt & OPT_VERBOSE);
258
259	if (signame) {
260	signal_nr = get_signum(signame);
261	if (signal_nr < 0) bb_show_usage();
262	}
263
264	if (!startas)
265	startas = execname;
266
267	// USE_FEATURE_START_STOP_DAEMON_FANCY(
268	// if (retry_arg)
269	// retries = xatoi_u(retry_arg);
270	// )
271	argc -= optind;
272	argv += optind;
273
274	if (userspec) {
275	user_id = bb_strtou(userspec, NULL, 10);
276	if (errno)
277	user_id = xuname2uid(userspec);
278	}
279
280	if (opt & CTX_STOP) {
281	int i = do_stop();
282	return (opt & OPT_OKNODO) ? 0 : (i<=0);
283	}
284
285	do_procinit();
286
287	if (found) {
288	if (!quiet)
289	printf("%s already running\n%d\n", execname, found->pid);
290	return !(opt & OPT_OKNODO);
291	}
292	*--argv = startas;
293	if (opt & OPT_BACKGROUND) {
294	setsid();
295	bb_daemonize();
296	}
297	if (opt & OPT_MAKEPID) {
298	/* user wants _us_ to make the pidfile */
299	FILE *pidf = xfopen(pidfile, "w");
300
301	pid_t pidt = getpid();
302	fprintf(pidf, "%d\n", pidt);
303	fclose(pidf);
304	}
305	if (chuid) {
306	user_id = bb_strtou(chuid, NULL, 10);
307	if (errno)
308	user_id = xuname2uid(chuid);
309	xsetuid(user_id);
310	}
311	#if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
312	if (opt & OPT_NICELEVEL) {
313	/* Set process priority */
314	int prio = getpriority(PRIO_PROCESS, 0) + xatoi_range(opt_N, INT_MIN/2, INT_MAX/2);
315	if (setpriority(PRIO_PROCESS, 0, prio) < 0) {
316	bb_perror_msg_and_die("setpriority(%d)", prio);
317	}
318	}
319	#endif
320	execv(startas, argv);
321	bb_perror_msg_and_die("cannot start %s", startas);
322	}