X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=debianutils%2Fstart_stop_daemon.c;h=c8b7fa8f21d912b3cfdb0ef735b350cdcb2359da;hb=9a4100cf53f75356854ce752374babf8135c3f42;hp=524259979968053785ce58b15c5e20ee3f003a1b;hpb=e125a683a77d14401644d15f38b7f578db723924;p=oweals%2Fbusybox.git diff --git a/debianutils/start_stop_daemon.c b/debianutils/start_stop_daemon.c index 524259979..c8b7fa8f2 100644 --- a/debianutils/start_stop_daemon.c +++ b/debianutils/start_stop_daemon.c @@ -5,7 +5,7 @@ * Written by Marek Michalkiewicz , * Adapted for busybox David Kimdon * - * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. + * Licensed under GPLv2 or later, see file LICENSE in this source tree. */ /* @@ -19,9 +19,10 @@ One (only) of these must be given: Search for matching processes. If --stop is given, stop all matching processes (by sending a signal). -If --start if given, start a new process unless a matching process was found. +If --start is given, start a new process unless a matching process was found. -Options controlling process matching: +Options controlling process matching +(if multiple conditions are specified, all must match): -u,--user USERNAME|UID Only consider this user's processes -n,--name PROCESS_NAME Look for processes by matching PROCESS_NAME with comm field in /proc/$PID/stat. @@ -30,11 +31,11 @@ Options controlling process matching: [TODO: can PROCESS_NAME be a full pathname? Should we require full match then with /proc/$PID/exe or argv[0] (comm can't be matched, it never contains path)] -x,--exec EXECUTABLE Look for processes that were started with this - command in /proc/$PID/cmdline. + command in /proc/$PID/exe and /proc/$PID/cmdline + (/proc/$PID/cmdline is a bbox extension) Unlike -n, we match against the full path: "ntpd" != "./ntpd" != "/path/to/ntpd" -p,--pidfile PID_FILE Look for processes with PID from this file -If multiple conditions are specified, all must match. Options which are valid for --start only: -x,--exec EXECUTABLE Program to run (1st arg of execvp). Mandatory. @@ -55,12 +56,72 @@ Misc options: -q,--quiet Quiet -v,--verbose Verbose */ +//config:config START_STOP_DAEMON +//config: bool "start-stop-daemon (12 kb)" +//config: default y +//config: help +//config: start-stop-daemon is used to control the creation and +//config: termination of system-level processes, usually the ones +//config: started during the startup of the system. +//config: +//config:config FEATURE_START_STOP_DAEMON_LONG_OPTIONS +//config: bool "Enable long options" +//config: default y +//config: depends on START_STOP_DAEMON && LONG_OPTS +//config: +//config:config FEATURE_START_STOP_DAEMON_FANCY +//config: bool "Support additional arguments" +//config: default y +//config: depends on START_STOP_DAEMON +//config: help +//config: -o|--oknodo ignored since we exit with 0 anyway +//config: -v|--verbose +//config: -N|--nicelevel N + +//applet:IF_START_STOP_DAEMON(APPLET_ODDNAME(start-stop-daemon, start_stop_daemon, BB_DIR_SBIN, BB_SUID_DROP, start_stop_daemon)) +/* not NOEXEC: uses bb_common_bufsiz1 */ + +//kbuild:lib-$(CONFIG_START_STOP_DAEMON) += start_stop_daemon.o + +//usage:#define start_stop_daemon_trivial_usage +//usage: "[OPTIONS] [-S|-K] ... [-- ARGS...]" +//usage:#define start_stop_daemon_full_usage "\n\n" +//usage: "Search for matching processes, and then\n" +//usage: "-K: stop all matching processes\n" +//usage: "-S: start a process unless a matching process is found\n" +//usage: "\nProcess matching:" +//usage: "\n -u USERNAME|UID Match only this user's processes" +//usage: "\n -n NAME Match processes with NAME" +//usage: "\n in comm field in /proc/PID/stat" +//usage: "\n -x EXECUTABLE Match processes with this command" +//usage: "\n command in /proc/PID/cmdline" +//usage: "\n -p FILE Match a process with PID from FILE" +//usage: "\n All specified conditions must match" +//usage: "\n-S only:" +//usage: "\n -x EXECUTABLE Program to run" +//usage: "\n -a NAME Zeroth argument" +//usage: "\n -b Background" +//usage: IF_FEATURE_START_STOP_DAEMON_FANCY( +//usage: "\n -N N Change nice level" +//usage: ) +//usage: "\n -c USER[:[GRP]] Change user/group" +//usage: "\n -m Write PID to pidfile specified by -p" +//usage: "\n-K only:" +//usage: "\n -s SIG Signal to send" +//usage: "\n -t Match only, exit with 0 if found" +//usage: "\nOther:" +//usage: IF_FEATURE_START_STOP_DAEMON_FANCY( +//usage: "\n -o Exit with status 0 if nothing is done" +//usage: "\n -v Verbose" +//usage: ) +//usage: "\n -q Quiet" #include /* Override ENABLE_FEATURE_PIDFILE */ #define WANT_PIDFILE 1 #include "libbb.h" +#include "common_bufsiz.h" struct pid_list { struct pid_list *next; @@ -89,27 +150,28 @@ enum { #define TEST (option_mask32 & OPT_TEST) struct globals { - struct pid_list *found; + struct pid_list *found_procs; char *userspec; char *cmdname; char *execname; char *pidfile; + char *execname_cmpbuf; + unsigned execname_sizeof; int user_id; smallint signal_nr; -}; -#define G (*(struct globals*)&bb_common_bufsiz1) -#define found (G.found ) +} FIX_ALIASING; +#define G (*(struct globals*)bb_common_bufsiz1) #define userspec (G.userspec ) #define cmdname (G.cmdname ) #define execname (G.execname ) #define pidfile (G.pidfile ) #define user_id (G.user_id ) #define signal_nr (G.signal_nr ) -#define INIT_G() \ - do { \ - user_id = -1; \ - signal_nr = 15; \ - } while (0) +#define INIT_G() do { \ + setup_common_bufsiz(); \ + user_id = -1; \ + signal_nr = 15; \ +} while (0) #ifdef OLDER_VERSION_OF_X /* -x,--exec EXECUTABLE @@ -119,7 +181,7 @@ struct globals { static int pid_is_exec(pid_t pid) { struct stat st; - char buf[sizeof("/proc//exe") + sizeof(int)*3]; + char buf[sizeof("/proc/%u/exe") + sizeof(int)*3]; sprintf(buf, "/proc/%u/exe", (unsigned)pid); if (stat(buf, &st) < 0) @@ -134,13 +196,23 @@ static int pid_is_exec(pid_t pid) static int pid_is_exec(pid_t pid) { ssize_t bytes; - char buf[PATH_MAX]; + char buf[sizeof("/proc/%u/cmdline") + sizeof(int)*3]; + char *procname, *exelink; + int match; + + procname = buf + sprintf(buf, "/proc/%u/exe", (unsigned)pid) - 3; + + exelink = xmalloc_readlink(buf); + match = (exelink && strcmp(execname, exelink) == 0); + free(exelink); + if (match) + return match; - sprintf(buf, "/proc/%u/cmdline", (unsigned)pid); - bytes = open_read_close(buf, buf, sizeof(buf) - 1); + strcpy(procname, "cmdline"); + bytes = open_read_close(buf, G.execname_cmpbuf, G.execname_sizeof); if (bytes > 0) { - buf[bytes] = '\0'; - return strcmp(buf, execname) == 0; + G.execname_cmpbuf[bytes] = '\0'; + return strcmp(execname, G.execname_cmpbuf) == 0; } return 0; } @@ -195,9 +267,9 @@ static void check(int pid) return; } p = xmalloc(sizeof(*p)); - p->next = found; + p->next = G.found_procs; p->pid = pid; - found = p; + G.found_procs = p; } static void do_pidfile(void) @@ -205,7 +277,7 @@ static void do_pidfile(void) FILE *f; unsigned pid; - f = fopen(pidfile, "r"); + f = fopen_for_read(pidfile); if (f) { if (fscanf(f, "%u", &pid) == 1) check(pid); @@ -267,23 +339,29 @@ static int do_stop(void) bb_error_msg_and_die("internal error, please report"); } - if (!found) { + if (!G.found_procs) { if (!QUIET) printf("no %s found; none killed\n", what); killed = -1; goto ret; } - for (p = found; p; p = p->next) { - if (TEST || kill(p->pid, signal_nr) == 0) { + for (p = G.found_procs; p; p = p->next) { + if (kill(p->pid, TEST ? 0 : signal_nr) == 0) { killed++; } else { - p->pid = 0; bb_perror_msg("warning: killing process %u", (unsigned)p->pid); + p->pid = 0; + if (TEST) { + /* Example: -K --test --pidfile PIDFILE detected + * that PIDFILE's pid doesn't exist */ + killed = -1; + goto ret; + } } } if (!QUIET && killed) { printf("stopped %s (pid", what); - for (p = found; p; p = p->next) + for (p = G.found_procs; p; p = p->next) if (p->pid) printf(" %u", (unsigned)p->pid); puts(")"); @@ -302,11 +380,11 @@ static const char start_stop_daemon_longopts[] ALIGN1 = "quiet\0" No_argument "q" "test\0" No_argument "t" "make-pidfile\0" No_argument "m" -#if ENABLE_FEATURE_START_STOP_DAEMON_FANCY +# if ENABLE_FEATURE_START_STOP_DAEMON_FANCY "oknodo\0" No_argument "o" "verbose\0" No_argument "v" "nicelevel\0" Required_argument "N" -#endif +# endif "startas\0" Required_argument "a" "name\0" Required_argument "n" "signal\0" Required_argument "s" @@ -314,20 +392,27 @@ static const char start_stop_daemon_longopts[] ALIGN1 = "chuid\0" Required_argument "c" "exec\0" Required_argument "x" "pidfile\0" Required_argument "p" -#if ENABLE_FEATURE_START_STOP_DAEMON_FANCY +# if ENABLE_FEATURE_START_STOP_DAEMON_FANCY "retry\0" Required_argument "R" -#endif +# endif ; +# define GETOPT32 getopt32long +# define LONGOPTS start_stop_daemon_longopts, +#else +# define GETOPT32 getopt32 +# define LONGOPTS #endif int start_stop_daemon_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; -int start_stop_daemon_main(int argc ATTRIBUTE_UNUSED, char **argv) +int start_stop_daemon_main(int argc UNUSED_PARAM, char **argv) { unsigned opt; char *signame; char *startas; char *chuid; +#ifdef OLDER_VERSION_OF_X struct stat execstat; +#endif #if ENABLE_FEATURE_START_STOP_DAEMON_FANCY // char *retry_arg = NULL; // int retries = -1; @@ -336,23 +421,22 @@ int start_stop_daemon_main(int argc ATTRIBUTE_UNUSED, char **argv) INIT_G(); -#if ENABLE_FEATURE_START_STOP_DAEMON_LONG_OPTIONS - applet_long_options = start_stop_daemon_longopts; -#endif - - /* -K or -S is required; they are mutually exclusive */ - /* -p is required if -m is given */ - /* -xpun (at least one) is required if -K is given */ - /* -xa (at least one) is required if -S is given */ - /* -q turns off -v */ - opt_complementary = "K:S:K--S:S--K:m?p:K?xpun:S?xa" - USE_FEATURE_START_STOP_DAEMON_FANCY("q-v"); - opt = getopt32(argv, "KSbqtma:n:s:u:c:x:p:" - USE_FEATURE_START_STOP_DAEMON_FANCY("ovN:"), -// USE_FEATURE_START_STOP_DAEMON_FANCY("ovN:R:"), + opt = GETOPT32(argv, "^" + "KSbqtma:n:s:u:c:x:p:" + IF_FEATURE_START_STOP_DAEMON_FANCY("ovN:R:") + /* -K or -S is required; they are mutually exclusive */ + /* -p is required if -m is given */ + /* -xpun (at least one) is required if -K is given */ + /* -xa (at least one) is required if -S is given */ + /* -q turns off -v */ + "\0" + "K:S:K--S:S--K:m?p:K?xpun:S?xa" + IF_FEATURE_START_STOP_DAEMON_FANCY("q-v"), + LONGOPTS &startas, &cmdname, &signame, &userspec, &chuid, &execname, &pidfile - USE_FEATURE_START_STOP_DAEMON_FANCY(,&opt_N) -// USE_FEATURE_START_STOP_DAEMON_FANCY(,&retry_arg) + IF_FEATURE_START_STOP_DAEMON_FANCY(,&opt_N) + /* We accept and ignore -R / --retry */ + IF_FEATURE_START_STOP_DAEMON_FANCY(,NULL) ); if (opt & OPT_s) { @@ -362,10 +446,16 @@ int start_stop_daemon_main(int argc ATTRIBUTE_UNUSED, char **argv) if (!(opt & OPT_a)) startas = execname; + if (!execname) /* in case -a is given and -x is not */ + execname = startas; + if (execname) { + G.execname_sizeof = strlen(execname) + 1; + G.execname_cmpbuf = xmalloc(G.execname_sizeof + 1); + } -// USE_FEATURE_START_STOP_DAEMON_FANCY( +// IF_FEATURE_START_STOP_DAEMON_FANCY( // if (retry_arg) -// retries = xatoi_u(retry_arg); +// retries = xatoi_positive(retry_arg); // ) //argc -= optind; argv += optind; @@ -375,56 +465,67 @@ int start_stop_daemon_main(int argc ATTRIBUTE_UNUSED, char **argv) if (errno) user_id = xuname2uid(userspec); } - do_procinit(); /* Both start and stop needs to know current processes */ + /* Both start and stop need to know current processes */ + do_procinit(); if (opt & CTX_STOP) { int i = do_stop(); return (opt & OPT_OKNODO) ? 0 : (i <= 0); } - if (found) { + if (G.found_procs) { if (!QUIET) - printf("%s already running\n%d\n", execname, found->pid); + printf("%s is already running\n%u\n", execname, (unsigned)G.found_procs->pid); return !(opt & OPT_OKNODO); } +#ifdef OLDER_VERSION_OF_X if (execname) xstat(execname, &execstat); +#endif *--argv = startas; if (opt & OPT_BACKGROUND) { #if BB_MMU - bb_daemonize(0); + bb_daemonize(DAEMON_DEVNULL_STDIO + DAEMON_CLOSE_EXTRA_FDS + DAEMON_DOUBLE_FORK); + /* DAEMON_DEVNULL_STDIO is superfluous - + * it's always done by bb_daemonize() */ #else - pid_t pid = vfork(); - if (pid < 0) /* error */ - bb_perror_msg_and_die("vfork"); + /* Daemons usually call bb_daemonize_or_rexec(), but SSD can do + * without: SSD is not itself a daemon, it _execs_ a daemon. + * The usual NOMMU problem of "child can't run indefinitely, + * it must exec" does not bite us: we exec anyway. + */ + pid_t pid = xvfork(); if (pid != 0) { /* parent */ /* why _exit? the child may have changed the stack, * so "return 0" may do bad things */ - _exit(0); + _exit(EXIT_SUCCESS); } - /* child */ + /* Child */ setsid(); /* detach from controlling tty */ - /* Redirect stdio to /dev/null, close extra FDs. - * We do not actually daemonize because of DAEMON_ONLY_SANITIZE */ - bb_daemonize_or_rexec( - DAEMON_DEVNULL_STDIO - + DAEMON_CLOSE_EXTRA_FDS - + DAEMON_ONLY_SANITIZE, - NULL /* argv, unused */ ); + /* Redirect stdio to /dev/null, close extra FDs */ + bb_daemon_helper(DAEMON_DEVNULL_STDIO + DAEMON_CLOSE_EXTRA_FDS); #endif } if (opt & OPT_MAKEPID) { - /* user wants _us_ to make the pidfile */ + /* User wants _us_ to make the pidfile */ write_pidfile(pidfile); } if (opt & OPT_c) { struct bb_uidgid_t ugid; parse_chown_usergroup_or_die(&ugid, chuid); - if (ugid.gid != (gid_t) -1) xsetgid(ugid.gid); - if (ugid.uid != (uid_t) -1) xsetuid(ugid.uid); + if (ugid.uid != (uid_t) -1L) { + struct passwd *pw = xgetpwuid(ugid.uid); + if (ugid.gid != (gid_t) -1L) + pw->pw_gid = ugid.gid; + /* initgroups, setgid, setuid: */ + change_identity(pw); + } else if (ugid.gid != (gid_t) -1L) { + xsetgid(ugid.gid); + setgroups(1, &ugid.gid); + } } #if ENABLE_FEATURE_START_STOP_DAEMON_FANCY if (opt & OPT_NICELEVEL) { @@ -435,6 +536,6 @@ int start_stop_daemon_main(int argc ATTRIBUTE_UNUSED, char **argv) } } #endif - execv(startas, argv); - bb_perror_msg_and_die("cannot start %s", startas); + execvp(startas, argv); + bb_perror_msg_and_die("can't execute '%s'", startas); }