debianutils/start_stop_daemon.c - busybox - Git at Google

 /* 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 = NULL;

 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 equal;

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

 	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/%d", 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 buf[sizeof("/proc//stat") + sizeof(int)*3];
 	FILE *f;
 	int c;

 	sprintf(buf, "/proc/%d/stat", pid);
 	f = fopen(buf, "r");
 	if (!f)
 		return 0;
 	while ((c = getc(f)) != EOF && c != '(')
 		;
 	if (c != '(') {
 		fclose(f);
 		return 0;
 	}
 	/* this hopefully handles command names containing ')' */
 	while ((c = getc(f)) != EOF && c == *name)
 		name++;
 	fclose(f);
 	return (c == ')' && *name == '\0');
 }


 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, "%d", &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) {
 		if (sscanf(entry->d_name, "%d", &pid) != 1)
 			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 ssd_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

 #define SSD_CTX_STOP            0x1
 #define SSD_CTX_START           0x2
 #define SSD_OPT_BACKGROUND      0x4
 #define SSD_OPT_QUIET           0x8
 #define SSD_OPT_MAKEPID         0x10
 #if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
 #define SSD_OPT_OKNODO          0x20
 #define SSD_OPT_VERBOSE         0x40
 #define SSD_OPT_NICELEVEL       0x80
 #endif

 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 = ssd_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 & SSD_OPT_QUIET)
 			USE_FEATURE_START_STOP_DAEMON_FANCY(&& !(opt & SSD_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 && sscanf(userspec, "%d", &user_id) != 1)
 		user_id = bb_xgetpwnam(userspec);

 	if (opt & SSD_CTX_STOP) {
 		int i = do_stop();
 		return
 			USE_FEATURE_START_STOP_DAEMON_FANCY((opt & SSD_OPT_OKNODO)
 				? 0 :) !!(i<=0);
 	}

 	do_procinit();

 	if (found) {
 		if (!quiet)
 			printf("%s already running\n%d\n", execname, found->pid);
 		USE_FEATURE_START_STOP_DAEMON_FANCY(return !(opt & SSD_OPT_OKNODO);)
 		SKIP_FEATURE_START_STOP_DAEMON_FANCY(return EXIT_FAILURE;)
 	}
 	*--argv = startas;
 	if (opt & SSD_OPT_BACKGROUND) {
 		xdaemon(0, 0);
 		setsid();
 	}
 	if (opt & SSD_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) {
 		if (sscanf(chuid, "%d", &user_id) != 1)
 			user_id = bb_xgetpwnam(chuid);
 		xsetuid(user_id);
 	}
 #if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
 	if (opt & SSD_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);
 }
	/* 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 = NULL;

	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 equal;

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

	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/%d", 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 buf[sizeof("/proc//stat") + sizeof(int)*3];
	FILE *f;
	int c;

	sprintf(buf, "/proc/%d/stat", pid);
	f = fopen(buf, "r");
	if (!f)
	return 0;
	while ((c = getc(f)) != EOF && c != '(')
	;
	if (c != '(') {
	fclose(f);
	return 0;
	}
	/* this hopefully handles command names containing ')' */
	while ((c = getc(f)) != EOF && c == *name)
	name++;
	fclose(f);
	return (c == ')' && *name == '\0');
	}


	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, "%d", &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) {
	if (sscanf(entry->d_name, "%d", &pid) != 1)
	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 ssd_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

	#define SSD_CTX_STOP 0x1
	#define SSD_CTX_START 0x2
	#define SSD_OPT_BACKGROUND 0x4
	#define SSD_OPT_QUIET 0x8
	#define SSD_OPT_MAKEPID 0x10
	#if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
	#define SSD_OPT_OKNODO 0x20
	#define SSD_OPT_VERBOSE 0x40
	#define SSD_OPT_NICELEVEL 0x80
	#endif

	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 = ssd_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 & SSD_OPT_QUIET)
	USE_FEATURE_START_STOP_DAEMON_FANCY(&& !(opt & SSD_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 && sscanf(userspec, "%d", &user_id) != 1)
	user_id = bb_xgetpwnam(userspec);

	if (opt & SSD_CTX_STOP) {
	int i = do_stop();
	return
	USE_FEATURE_START_STOP_DAEMON_FANCY((opt & SSD_OPT_OKNODO)
	? 0 :) !!(i<=0);
	}

	do_procinit();

	if (found) {
	if (!quiet)
	printf("%s already running\n%d\n", execname, found->pid);
	USE_FEATURE_START_STOP_DAEMON_FANCY(return !(opt & SSD_OPT_OKNODO);)
	SKIP_FEATURE_START_STOP_DAEMON_FANCY(return EXIT_FAILURE;)
	}
	*--argv = startas;
	if (opt & SSD_OPT_BACKGROUND) {
	xdaemon(0, 0);
	setsid();
	}
	if (opt & SSD_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) {
	if (sscanf(chuid, "%d", &user_id) != 1)
	user_id = bb_xgetpwnam(chuid);
	xsetuid(user_id);
	}
	#if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
	if (opt & SSD_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);
	}