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	niro	532	/* 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			}