| /* 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); |
| 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); |
| } |