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183843cd DS |
1 | /* |
2 | * A rewrite of the original Debian's start-stop-daemon Perl script | |
3 | * in C (faster - it is executed many times during system startup). | |
4 | * | |
5 | * Written by Marek Michalkiewicz <marekm@i17linuxb.ists.pwr.wroc.pl>, | |
6 | * public domain. Based conceptually on start-stop-daemon.pl, by Ian | |
7 | * Jackson <ijackson@gnu.ai.mit.edu>. May be used and distributed | |
8 | * freely for any purpose. Changes by Christian Schwarz | |
9 | * <schwarz@monet.m.isar.de>, to make output conform to the Debian | |
10 | * Console Message Standard, also placed in public domain. Minor | |
11 | * changes by Klee Dienes <klee@debian.org>, also placed in the Public | |
12 | * Domain. | |
13 | * | |
14 | * Changes by Ben Collins <bcollins@debian.org>, added --chuid, --background | |
15 | * and --make-pidfile options, placed in public domain aswell. | |
16 | * | |
17 | * Port to OpenBSD by Sontri Tomo Huynh <huynh.29@osu.edu> | |
18 | * and Andreas Schuldei <andreas@schuldei.org> | |
19 | * | |
20 | * Changes by Ian Jackson: added --retry (and associated rearrangements). | |
21 | * | |
22 | * Modified for Gentoo rc-scripts by Donny Davies <woodchip@gentoo.org>: | |
23 | * I removed the BSD/Hurd/OtherOS stuff, added #include <stddef.h> | |
24 | * and stuck in a #define VERSION "1.9.18". Now it compiles without | |
25 | * the whole automake/config.h dance. | |
26 | */ | |
27 | ||
b45ac5f5 DL |
28 | #ifdef HAVE_CONFIG_H |
29 | #include "config.h" | |
30 | #endif | |
31 | ||
183843cd DS |
32 | #ifdef HAVE_LXC |
33 | #define _GNU_SOURCE | |
34 | #include <sched.h> | |
35 | #endif /* HAVE_LXC */ | |
36 | ||
37 | #include <stddef.h> | |
b45ac5f5 | 38 | #undef VERSION |
183843cd DS |
39 | #define VERSION "1.9.18" |
40 | ||
41 | #define MIN_POLL_INTERVAL 20000 /*us*/ | |
42 | ||
43 | #include <errno.h> | |
44 | #include <stdio.h> | |
45 | #include <stdlib.h> | |
46 | #include <string.h> | |
47 | #include <stdarg.h> | |
48 | #include <signal.h> | |
49 | #include <sys/stat.h> | |
50 | #include <dirent.h> | |
51 | #include <sys/time.h> | |
52 | #include <sys/queue.h> | |
53 | #include <unistd.h> | |
54 | #include <getopt.h> | |
55 | #include <pwd.h> | |
56 | #include <grp.h> | |
57 | #include <sys/ioctl.h> | |
58 | #include <sys/types.h> | |
f89d8115 | 59 | #include <termios.h> |
183843cd DS |
60 | #include <fcntl.h> |
61 | #include <limits.h> | |
62 | #include <assert.h> | |
63 | #include <ctype.h> | |
8f500a1c | 64 | #ifdef linux |
183843cd | 65 | #include <linux/sched.h> |
8f500a1c | 66 | #endif |
183843cd DS |
67 | |
68 | static int testmode = 0; | |
69 | static int quietmode = 0; | |
70 | static int exitnodo = 1; | |
71 | static int start = 0; | |
72 | static int stop = 0; | |
73 | static int background = 0; | |
74 | static int mpidfile = 0; | |
75 | static int signal_nr = 15; | |
76 | static const char *signal_str = NULL; | |
77 | static int user_id = -1; | |
78 | static int runas_uid = -1; | |
79 | static int runas_gid = -1; | |
80 | static const char *userspec = NULL; | |
81 | static char *changeuser = NULL; | |
82 | static const char *changegroup = NULL; | |
83 | static char *changeroot = NULL; | |
84 | static const char *cmdname = NULL; | |
85 | static char *execname = NULL; | |
86 | static char *startas = NULL; | |
87 | static const char *pidfile = NULL; | |
88 | static char what_stop[1024]; | |
89 | static const char *schedule_str = NULL; | |
90 | static const char *progname = ""; | |
91 | static int nicelevel = 0; | |
92 | ||
93 | static struct stat exec_stat; | |
94 | ||
95 | struct pid_list { | |
96 | struct pid_list *next; | |
97 | pid_t pid; | |
98 | }; | |
99 | ||
100 | static struct pid_list *found = NULL; | |
101 | static struct pid_list *killed = NULL; | |
102 | ||
103 | struct schedule_item { | |
104 | enum { sched_timeout, sched_signal, sched_goto, sched_forever } type; | |
105 | int value; /* seconds, signal no., or index into array */ | |
106 | /* sched_forever is only seen within parse_schedule and callees */ | |
107 | }; | |
108 | ||
109 | static int schedule_length; | |
110 | static struct schedule_item *schedule = NULL; | |
111 | ||
112 | LIST_HEAD(namespace_head, namespace); | |
113 | ||
d62a17ae | 114 | struct namespace |
115 | { | |
183843cd | 116 | LIST_ENTRY(namespace) list; |
c9deb8fd | 117 | const char *path; |
183843cd DS |
118 | int nstype; |
119 | }; | |
120 | ||
121 | static struct namespace_head namespace_head; | |
122 | ||
123 | static void *xmalloc(int size); | |
124 | static void push(struct pid_list **list, pid_t pid); | |
125 | static void do_help(void); | |
d62a17ae | 126 | static void parse_options(int argc, char *const *argv); |
183843cd DS |
127 | static int pid_is_user(pid_t pid, uid_t uid); |
128 | static int pid_is_cmd(pid_t pid, const char *name); | |
129 | static void check(pid_t pid); | |
130 | static void do_pidfile(const char *name); | |
d62a17ae | 131 | static void do_stop(int signal_nr, int quietmode, int *n_killed, |
132 | int *n_notkilled, int retry_nr); | |
183843cd DS |
133 | static int pid_is_exec(pid_t pid, const struct stat *esb); |
134 | ||
135 | #ifdef __GNUC__ | |
136 | static void fatal(const char *format, ...) | |
137 | __attribute__((noreturn, format(printf, 1, 2))); | |
d62a17ae | 138 | static void badusage(const char *msg) __attribute__((noreturn)); |
183843cd DS |
139 | #else |
140 | static void fatal(const char *format, ...); | |
141 | static void badusage(const char *msg); | |
142 | #endif | |
143 | ||
144 | /* This next part serves only to construct the TVCALC macro, which | |
145 | * is used for doing arithmetic on struct timeval's. It works like this: | |
146 | * TVCALC(result, expression); | |
147 | * where result is a struct timeval (and must be an lvalue) and | |
148 | * expression is the single expression for both components. In this | |
149 | * expression you can use the special values TVELEM, which when fed a | |
150 | * const struct timeval* gives you the relevant component, and | |
151 | * TVADJUST. TVADJUST is necessary when subtracting timevals, to make | |
152 | * it easier to renormalise. Whenver you subtract timeval elements, | |
153 | * you must make sure that TVADJUST is added to the result of the | |
154 | * subtraction (before any resulting multiplication or what have you). | |
155 | * TVELEM must be linear in TVADJUST. | |
156 | */ | |
d62a17ae | 157 | typedef long tvselector(const struct timeval *); |
158 | static long tvselector_sec(const struct timeval *tv) | |
159 | { | |
160 | return tv->tv_sec; | |
183843cd | 161 | } |
d62a17ae | 162 | static long tvselector_usec(const struct timeval *tv) |
163 | { | |
164 | return tv->tv_usec; | |
165 | } | |
166 | #define TVCALC_ELEM(result, expr, sec, adj) \ | |
167 | { \ | |
168 | const long TVADJUST = adj; \ | |
169 | long (*const TVELEM)(const struct timeval *) = \ | |
170 | tvselector_##sec; \ | |
171 | (result).tv_##sec = (expr); \ | |
172 | } | |
173 | #define TVCALC(result, expr) \ | |
174 | do { \ | |
175 | TVCALC_ELEM(result, expr, sec, (-1)); \ | |
176 | TVCALC_ELEM(result, expr, usec, (+1000000)); \ | |
177 | (result).tv_sec += (result).tv_usec / 1000000; \ | |
178 | (result).tv_usec %= 1000000; \ | |
179 | } while (0) | |
183843cd DS |
180 | |
181 | ||
d62a17ae | 182 | static void fatal(const char *format, ...) |
183843cd DS |
183 | { |
184 | va_list arglist; | |
185 | ||
186 | fprintf(stderr, "%s: ", progname); | |
187 | va_start(arglist, format); | |
188 | vfprintf(stderr, format, arglist); | |
189 | va_end(arglist); | |
190 | putc('\n', stderr); | |
191 | exit(2); | |
192 | } | |
193 | ||
194 | ||
d62a17ae | 195 | static void *xmalloc(int size) |
183843cd DS |
196 | { |
197 | void *ptr; | |
198 | ||
199 | ptr = malloc(size); | |
200 | if (ptr) | |
201 | return ptr; | |
202 | fatal("malloc(%d) failed", size); | |
203 | } | |
204 | ||
d62a17ae | 205 | static void xgettimeofday(struct timeval *tv) |
183843cd | 206 | { |
d62a17ae | 207 | if (gettimeofday(tv, 0) != 0) |
183843cd DS |
208 | fatal("gettimeofday failed: %s", strerror(errno)); |
209 | } | |
210 | ||
d62a17ae | 211 | static void push(struct pid_list **list, pid_t pid) |
183843cd DS |
212 | { |
213 | struct pid_list *p; | |
214 | ||
215 | p = xmalloc(sizeof(*p)); | |
216 | p->next = *list; | |
217 | p->pid = pid; | |
218 | *list = p; | |
219 | } | |
220 | ||
d62a17ae | 221 | static void clear(struct pid_list **list) |
183843cd DS |
222 | { |
223 | struct pid_list *here, *next; | |
224 | ||
225 | for (here = *list; here != NULL; here = next) { | |
226 | next = here->next; | |
227 | free(here); | |
228 | } | |
229 | ||
230 | *list = NULL; | |
231 | } | |
232 | ||
7936827a | 233 | #ifdef linux |
d62a17ae | 234 | static const char *next_dirname(const char *s) |
183843cd | 235 | { |
c9deb8fd | 236 | const char *cur; |
183843cd | 237 | |
c4efd0f4 | 238 | cur = s; |
183843cd DS |
239 | |
240 | if (*cur != '\0') { | |
241 | for (; *cur != '/'; ++cur) | |
242 | if (*cur == '\0') | |
243 | return cur; | |
244 | ||
245 | for (; *cur == '/'; ++cur) | |
246 | ; | |
247 | } | |
248 | ||
249 | return cur; | |
250 | } | |
251 | ||
d62a17ae | 252 | static void add_namespace(const char *path) |
183843cd DS |
253 | { |
254 | int nstype; | |
255 | const char *nsdirname, *nsname, *cur; | |
256 | struct namespace *namespace; | |
257 | ||
c4efd0f4 | 258 | cur = path; |
183843cd DS |
259 | nsdirname = nsname = ""; |
260 | ||
261 | while ((cur = next_dirname(cur))[0] != '\0') { | |
262 | nsdirname = nsname; | |
263 | nsname = cur; | |
264 | } | |
265 | ||
e1be9119 | 266 | if (!strncmp(nsdirname, "ipcns/", strlen("ipcns/"))) |
183843cd | 267 | nstype = CLONE_NEWIPC; |
e1be9119 | 268 | else if (!strncmp(nsdirname, "netns/", strlen("netns/"))) |
183843cd | 269 | nstype = CLONE_NEWNET; |
e1be9119 | 270 | else if (!strncmp(nsdirname, "utcns/", strlen("utcns/"))) |
183843cd DS |
271 | nstype = CLONE_NEWUTS; |
272 | else | |
273 | badusage("invalid namepspace path"); | |
274 | ||
275 | namespace = xmalloc(sizeof(*namespace)); | |
c4efd0f4 | 276 | namespace->path = path; |
183843cd DS |
277 | namespace->nstype = nstype; |
278 | LIST_INSERT_HEAD(&namespace_head, namespace, list); | |
279 | } | |
8f500a1c | 280 | #endif |
183843cd DS |
281 | |
282 | #ifdef HAVE_LXC | |
4d762f26 | 283 | static void set_namespaces(void) |
183843cd DS |
284 | { |
285 | struct namespace *namespace; | |
286 | int fd; | |
287 | ||
a2addae8 | 288 | LIST_FOREACH (namespace, &namespace_head, list) { |
183843cd | 289 | if ((fd = open(namespace->path, O_RDONLY)) == -1) |
d62a17ae | 290 | fatal("open namespace %s: %s", namespace->path, |
291 | strerror(errno)); | |
183843cd DS |
292 | if (setns(fd, namespace->nstype) == -1) |
293 | fatal("setns %s: %s", namespace->path, strerror(errno)); | |
294 | } | |
295 | } | |
296 | #else | |
4d762f26 | 297 | static void set_namespaces(void) |
183843cd DS |
298 | { |
299 | if (!LIST_EMPTY(&namespace_head)) | |
300 | fatal("LCX namespaces not supported"); | |
301 | } | |
302 | #endif | |
303 | ||
d62a17ae | 304 | static void do_help(void) |
183843cd | 305 | { |
d62a17ae | 306 | printf("start-stop-daemon " VERSION |
307 | " for Debian - small and fast C version written by\n" | |
308 | "Marek Michalkiewicz <marekm@i17linuxb.ists.pwr.wroc.pl>, public domain.\n" | |
309 | "\n" | |
310 | "Usage:\n" | |
311 | " start-stop-daemon -S|--start options ... -- arguments ...\n" | |
312 | " start-stop-daemon -K|--stop options ...\n" | |
313 | " start-stop-daemon -H|--help\n" | |
314 | " start-stop-daemon -V|--version\n" | |
315 | "\n" | |
316 | "Options (at least one of --exec|--pidfile|--user is required):\n" | |
317 | " -x|--exec <executable> program to start/check if it is running\n" | |
318 | " -p|--pidfile <pid-file> pid file to check\n" | |
319 | " -c|--chuid <name|uid[:group|gid]>\n" | |
320 | " change to this user/group before starting process\n" | |
321 | " -u|--user <username>|<uid> stop processes owned by this user\n" | |
322 | " -n|--name <process-name> stop processes with this name\n" | |
323 | " -s|--signal <signal> signal to send (default TERM)\n" | |
324 | " -a|--startas <pathname> program to start (default is <executable>)\n" | |
325 | " -N|--nicelevel <incr> add incr to the process's nice level\n" | |
326 | " -b|--background force the process to detach\n" | |
327 | " -m|--make-pidfile create the pidfile before starting\n" | |
328 | " -R|--retry <schedule> check whether processes die, and retry\n" | |
329 | " -t|--test test mode, don't do anything\n" | |
330 | " -o|--oknodo exit status 0 (not 1) if nothing done\n" | |
331 | " -q|--quiet be more quiet\n" | |
332 | " -v|--verbose be more verbose\n" | |
333 | "Retry <schedule> is <item>|/<item>/... where <item> is one of\n" | |
334 | " -<signal-num>|[-]<signal-name> send that signal\n" | |
335 | " <timeout> wait that many seconds\n" | |
336 | " forever repeat remainder forever\n" | |
337 | "or <schedule> may be just <timeout>, meaning <signal>/<timeout>/KILL/<timeout>\n" | |
338 | "\n" | |
339 | "Exit status: 0 = done 1 = nothing done (=> 0 if --oknodo)\n" | |
340 | " 3 = trouble 2 = with --retry, processes wouldn't die\n"); | |
183843cd DS |
341 | } |
342 | ||
343 | ||
d62a17ae | 344 | static void badusage(const char *msg) |
183843cd DS |
345 | { |
346 | if (msg) | |
347 | fprintf(stderr, "%s: %s\n", progname, msg); | |
348 | fprintf(stderr, "Try `%s --help' for more information.\n", progname); | |
349 | exit(3); | |
350 | } | |
351 | ||
352 | struct sigpair { | |
353 | const char *name; | |
354 | int signal; | |
355 | }; | |
356 | ||
357 | const struct sigpair siglist[] = { | |
d62a17ae | 358 | {"ABRT", SIGABRT}, {"ALRM", SIGALRM}, {"FPE", SIGFPE}, |
359 | {"HUP", SIGHUP}, {"ILL", SIGILL}, {"INT", SIGINT}, | |
360 | {"KILL", SIGKILL}, {"PIPE", SIGPIPE}, {"QUIT", SIGQUIT}, | |
361 | {"SEGV", SIGSEGV}, {"TERM", SIGTERM}, {"USR1", SIGUSR1}, | |
362 | {"USR2", SIGUSR2}, {"CHLD", SIGCHLD}, {"CONT", SIGCONT}, | |
363 | {"STOP", SIGSTOP}, {"TSTP", SIGTSTP}, {"TTIN", SIGTTIN}, | |
364 | {"TTOU", SIGTTOU}}; | |
365 | ||
366 | static int parse_integer(const char *string, int *value_r) | |
367 | { | |
183843cd DS |
368 | unsigned long ul; |
369 | char *ep; | |
370 | ||
371 | if (!string[0]) | |
372 | return -1; | |
373 | ||
d62a17ae | 374 | ul = strtoul(string, &ep, 10); |
183843cd DS |
375 | if (ul > INT_MAX || *ep != '\0') |
376 | return -1; | |
377 | ||
d62a17ae | 378 | *value_r = ul; |
183843cd DS |
379 | return 0; |
380 | } | |
381 | ||
d62a17ae | 382 | static int parse_signal(const char *signal_str, int *signal_nr) |
183843cd DS |
383 | { |
384 | unsigned int i; | |
385 | ||
386 | if (parse_integer(signal_str, signal_nr) == 0) | |
387 | return 0; | |
388 | ||
d62a17ae | 389 | for (i = 0; i < sizeof(siglist) / sizeof(siglist[0]); i++) { |
390 | if (strcmp(signal_str, siglist[i].name) == 0) { | |
183843cd DS |
391 | *signal_nr = siglist[i].signal; |
392 | return 0; | |
393 | } | |
394 | } | |
395 | return -1; | |
396 | } | |
397 | ||
d62a17ae | 398 | static void parse_schedule_item(const char *string, struct schedule_item *item) |
399 | { | |
183843cd DS |
400 | const char *after_hyph; |
401 | ||
d62a17ae | 402 | if (!strcmp(string, "forever")) { |
183843cd | 403 | item->type = sched_forever; |
fefa5e0f | 404 | } else if (isdigit((unsigned char)string[0])) { |
183843cd DS |
405 | item->type = sched_timeout; |
406 | if (parse_integer(string, &item->value) != 0) | |
407 | badusage("invalid timeout value in schedule"); | |
d62a17ae | 408 | } else if ((after_hyph = string + (string[0] == '-')) |
409 | && parse_signal(after_hyph, &item->value) == 0) { | |
183843cd DS |
410 | item->type = sched_signal; |
411 | } else { | |
d62a17ae | 412 | badusage( |
3efd0893 | 413 | "invalid schedule item (must be [-]<signal-name>, -<signal-number>, <timeout> or `forever'"); |
183843cd DS |
414 | } |
415 | } | |
416 | ||
d62a17ae | 417 | static void parse_schedule(const char *schedule_str) |
418 | { | |
183843cd DS |
419 | char item_buf[20]; |
420 | const char *slash; | |
421 | int count, repeatat; | |
422 | ptrdiff_t str_len; | |
423 | ||
424 | count = 0; | |
425 | for (slash = schedule_str; *slash; slash++) | |
426 | if (*slash == '/') | |
427 | count++; | |
428 | ||
d62a17ae | 429 | schedule_length = (count == 0) ? 4 : count + 1; |
183843cd DS |
430 | schedule = xmalloc(sizeof(*schedule) * schedule_length); |
431 | ||
432 | if (count == 0) { | |
433 | schedule[0].type = sched_signal; | |
434 | schedule[0].value = signal_nr; | |
435 | parse_schedule_item(schedule_str, &schedule[1]); | |
436 | if (schedule[1].type != sched_timeout) { | |
d62a17ae | 437 | badusage( |
3efd0893 | 438 | "--retry takes timeout, or schedule list of at least two items"); |
183843cd DS |
439 | } |
440 | schedule[2].type = sched_signal; | |
441 | schedule[2].value = SIGKILL; | |
d62a17ae | 442 | schedule[3] = schedule[1]; |
183843cd DS |
443 | } else { |
444 | count = 0; | |
445 | repeatat = -1; | |
446 | while (schedule_str != NULL) { | |
d62a17ae | 447 | slash = strchr(schedule_str, '/'); |
448 | str_len = slash ? slash - schedule_str | |
449 | : (ptrdiff_t)strlen(schedule_str); | |
183843cd | 450 | if (str_len >= (ptrdiff_t)sizeof(item_buf)) |
d62a17ae | 451 | badusage( |
3efd0893 | 452 | "invalid schedule item: far too long (you must delimit items with slashes)"); |
183843cd DS |
453 | memcpy(item_buf, schedule_str, str_len); |
454 | item_buf[str_len] = 0; | |
d62a17ae | 455 | schedule_str = slash ? slash + 1 : NULL; |
183843cd DS |
456 | |
457 | parse_schedule_item(item_buf, &schedule[count]); | |
458 | if (schedule[count].type == sched_forever) { | |
459 | if (repeatat >= 0) | |
d62a17ae | 460 | badusage( |
3efd0893 | 461 | "invalid schedule: `forever' appears more than once"); |
183843cd DS |
462 | repeatat = count; |
463 | continue; | |
464 | } | |
465 | count++; | |
466 | } | |
467 | if (repeatat >= 0) { | |
468 | schedule[count].type = sched_goto; | |
469 | schedule[count].value = repeatat; | |
470 | count++; | |
471 | } | |
472 | assert(count == schedule_length); | |
473 | } | |
474 | } | |
475 | ||
d62a17ae | 476 | static void parse_options(int argc, char *const *argv) |
183843cd DS |
477 | { |
478 | static struct option longopts[] = { | |
d62a17ae | 479 | {"help", 0, NULL, 'H'}, {"stop", 0, NULL, 'K'}, |
480 | {"start", 0, NULL, 'S'}, {"version", 0, NULL, 'V'}, | |
481 | {"startas", 1, NULL, 'a'}, {"name", 1, NULL, 'n'}, | |
482 | {"oknodo", 0, NULL, 'o'}, {"pidfile", 1, NULL, 'p'}, | |
483 | {"quiet", 0, NULL, 'q'}, {"signal", 1, NULL, 's'}, | |
484 | {"test", 0, NULL, 't'}, {"user", 1, NULL, 'u'}, | |
485 | {"chroot", 1, NULL, 'r'}, {"namespace", 1, NULL, 'd'}, | |
486 | {"verbose", 0, NULL, 'v'}, {"exec", 1, NULL, 'x'}, | |
487 | {"chuid", 1, NULL, 'c'}, {"nicelevel", 1, NULL, 'N'}, | |
488 | {"background", 0, NULL, 'b'}, {"make-pidfile", 0, NULL, 'm'}, | |
489 | {"retry", 1, NULL, 'R'}, {NULL, 0, NULL, 0}}; | |
183843cd DS |
490 | int c; |
491 | ||
492 | for (;;) { | |
d62a17ae | 493 | c = getopt_long(argc, argv, |
494 | "HKSVa:n:op:qr:d:s:tu:vx:c:N:bmR:", longopts, | |
495 | (int *)0); | |
183843cd DS |
496 | if (c == -1) |
497 | break; | |
498 | switch (c) { | |
d62a17ae | 499 | case 'H': /* --help */ |
183843cd DS |
500 | do_help(); |
501 | exit(0); | |
d62a17ae | 502 | case 'K': /* --stop */ |
183843cd DS |
503 | stop = 1; |
504 | break; | |
d62a17ae | 505 | case 'S': /* --start */ |
183843cd DS |
506 | start = 1; |
507 | break; | |
d62a17ae | 508 | case 'V': /* --version */ |
183843cd DS |
509 | printf("start-stop-daemon " VERSION "\n"); |
510 | exit(0); | |
d62a17ae | 511 | case 'a': /* --startas <pathname> */ |
183843cd DS |
512 | startas = optarg; |
513 | break; | |
d62a17ae | 514 | case 'n': /* --name <process-name> */ |
183843cd DS |
515 | cmdname = optarg; |
516 | break; | |
d62a17ae | 517 | case 'o': /* --oknodo */ |
183843cd DS |
518 | exitnodo = 0; |
519 | break; | |
d62a17ae | 520 | case 'p': /* --pidfile <pid-file> */ |
183843cd DS |
521 | pidfile = optarg; |
522 | break; | |
d62a17ae | 523 | case 'q': /* --quiet */ |
183843cd DS |
524 | quietmode = 1; |
525 | break; | |
d62a17ae | 526 | case 's': /* --signal <signal> */ |
183843cd DS |
527 | signal_str = optarg; |
528 | break; | |
d62a17ae | 529 | case 't': /* --test */ |
183843cd DS |
530 | testmode = 1; |
531 | break; | |
d62a17ae | 532 | case 'u': /* --user <username>|<uid> */ |
183843cd DS |
533 | userspec = optarg; |
534 | break; | |
d62a17ae | 535 | case 'v': /* --verbose */ |
183843cd DS |
536 | quietmode = -1; |
537 | break; | |
d62a17ae | 538 | case 'x': /* --exec <executable> */ |
183843cd DS |
539 | execname = optarg; |
540 | break; | |
d62a17ae | 541 | case 'c': /* --chuid <username>|<uid> */ |
44f12f20 | 542 | changeuser = strtok(optarg, ":"); |
183843cd DS |
543 | changegroup = strtok(NULL, ":"); |
544 | break; | |
d62a17ae | 545 | case 'r': /* --chroot /new/root */ |
183843cd DS |
546 | changeroot = optarg; |
547 | break; | |
548 | case 'd': /* --namespace /.../<ipcns>|<netns>|<utsns>/name */ | |
8f500a1c | 549 | #ifdef linux |
183843cd | 550 | add_namespace(optarg); |
8f500a1c | 551 | #endif |
183843cd | 552 | break; |
d62a17ae | 553 | case 'N': /* --nice */ |
183843cd DS |
554 | nicelevel = atoi(optarg); |
555 | break; | |
d62a17ae | 556 | case 'b': /* --background */ |
183843cd DS |
557 | background = 1; |
558 | break; | |
d62a17ae | 559 | case 'm': /* --make-pidfile */ |
183843cd DS |
560 | mpidfile = 1; |
561 | break; | |
d62a17ae | 562 | case 'R': /* --retry <schedule>|<timeout> */ |
183843cd DS |
563 | schedule_str = optarg; |
564 | break; | |
565 | default: | |
d62a17ae | 566 | badusage(NULL); /* message printed by getopt */ |
183843cd DS |
567 | } |
568 | } | |
569 | ||
570 | if (signal_str != NULL) { | |
d62a17ae | 571 | if (parse_signal(signal_str, &signal_nr) != 0) |
572 | badusage( | |
3efd0893 | 573 | "signal value must be numeric or name of signal (KILL, INTR, ...)"); |
183843cd DS |
574 | } |
575 | ||
576 | if (schedule_str != NULL) { | |
577 | parse_schedule(schedule_str); | |
578 | } | |
579 | ||
580 | if (start == stop) | |
581 | badusage("need one of --start or --stop"); | |
582 | ||
583 | if (!execname && !pidfile && !userspec && !cmdname) | |
d62a17ae | 584 | badusage( |
585 | "need at least one of --exec, --pidfile, --user or --name"); | |
183843cd DS |
586 | |
587 | if (!startas) | |
588 | startas = execname; | |
589 | ||
590 | if (start && !startas) | |
591 | badusage("--start needs --exec or --startas"); | |
592 | ||
593 | if (mpidfile && pidfile == NULL) | |
594 | badusage("--make-pidfile is only relevant with --pidfile"); | |
595 | ||
596 | if (background && !start) | |
597 | badusage("--background is only relevant with --start"); | |
183843cd DS |
598 | } |
599 | ||
d62a17ae | 600 | static int pid_is_exec(pid_t pid, const struct stat *esb) |
183843cd DS |
601 | { |
602 | struct stat sb; | |
2b7165e7 | 603 | char buf[PATH_MAX]; |
183843cd | 604 | |
772270f3 | 605 | snprintf(buf, sizeof(buf), "/proc/%ld/exe", (long)pid); |
183843cd DS |
606 | if (stat(buf, &sb) != 0) |
607 | return 0; | |
608 | return (sb.st_dev == esb->st_dev && sb.st_ino == esb->st_ino); | |
609 | } | |
610 | ||
611 | ||
d62a17ae | 612 | static int pid_is_user(pid_t pid, uid_t uid) |
183843cd DS |
613 | { |
614 | struct stat sb; | |
2b7165e7 | 615 | char buf[PATH_MAX]; |
183843cd | 616 | |
772270f3 | 617 | snprintf(buf, sizeof(buf), "/proc/%ld", (long)pid); |
183843cd DS |
618 | if (stat(buf, &sb) != 0) |
619 | return 0; | |
620 | return (sb.st_uid == uid); | |
621 | } | |
622 | ||
623 | ||
d62a17ae | 624 | static int pid_is_cmd(pid_t pid, const char *name) |
183843cd | 625 | { |
2b7165e7 | 626 | char buf[PATH_MAX]; |
183843cd DS |
627 | FILE *f; |
628 | int c; | |
629 | ||
772270f3 | 630 | snprintf(buf, sizeof(buf), "/proc/%ld/stat", (long)pid); |
183843cd DS |
631 | f = fopen(buf, "r"); |
632 | if (!f) | |
633 | return 0; | |
634 | while ((c = getc(f)) != EOF && c != '(') | |
635 | ; | |
636 | if (c != '(') { | |
637 | fclose(f); | |
638 | return 0; | |
639 | } | |
640 | /* this hopefully handles command names containing ')' */ | |
641 | while ((c = getc(f)) != EOF && c == *name) | |
642 | name++; | |
643 | fclose(f); | |
644 | return (c == ')' && *name == '\0'); | |
645 | } | |
646 | ||
647 | ||
d62a17ae | 648 | static void check(pid_t pid) |
183843cd DS |
649 | { |
650 | if (execname && !pid_is_exec(pid, &exec_stat)) | |
651 | return; | |
652 | if (userspec && !pid_is_user(pid, user_id)) | |
653 | return; | |
654 | if (cmdname && !pid_is_cmd(pid, cmdname)) | |
655 | return; | |
656 | push(&found, pid); | |
657 | } | |
658 | ||
d62a17ae | 659 | static void do_pidfile(const char *name) |
183843cd DS |
660 | { |
661 | FILE *f; | |
ae9eebca | 662 | long pid; |
183843cd DS |
663 | |
664 | f = fopen(name, "r"); | |
665 | if (f) { | |
ae9eebca DL |
666 | if (fscanf(f, "%ld", &pid) == 1) |
667 | check((pid_t)pid); | |
183843cd DS |
668 | fclose(f); |
669 | } else if (errno != ENOENT) | |
670 | fatal("open pidfile %s: %s", name, strerror(errno)); | |
183843cd DS |
671 | } |
672 | ||
673 | /* WTA: this needs to be an autoconf check for /proc/pid existance. | |
674 | */ | |
d62a17ae | 675 | static void do_procinit(void) |
183843cd DS |
676 | { |
677 | DIR *procdir; | |
678 | struct dirent *entry; | |
679 | int foundany; | |
ae9eebca | 680 | long pid; |
183843cd DS |
681 | |
682 | procdir = opendir("/proc"); | |
683 | if (!procdir) | |
684 | fatal("opendir /proc: %s", strerror(errno)); | |
685 | ||
686 | foundany = 0; | |
687 | while ((entry = readdir(procdir)) != NULL) { | |
ae9eebca | 688 | if (sscanf(entry->d_name, "%ld", &pid) != 1) |
183843cd DS |
689 | continue; |
690 | foundany++; | |
ae9eebca | 691 | check((pid_t)pid); |
183843cd DS |
692 | } |
693 | closedir(procdir); | |
694 | if (!foundany) | |
695 | fatal("nothing in /proc - not mounted?"); | |
696 | } | |
697 | ||
d62a17ae | 698 | static void do_findprocs(void) |
183843cd DS |
699 | { |
700 | clear(&found); | |
d62a17ae | 701 | |
183843cd DS |
702 | if (pidfile) |
703 | do_pidfile(pidfile); | |
704 | else | |
705 | do_procinit(); | |
706 | } | |
707 | ||
708 | /* return 1 on failure */ | |
d62a17ae | 709 | static void do_stop(int signal_nr, int quietmode, int *n_killed, |
710 | int *n_notkilled, int retry_nr) | |
183843cd DS |
711 | { |
712 | struct pid_list *p; | |
713 | ||
d62a17ae | 714 | do_findprocs(); |
715 | ||
716 | *n_killed = 0; | |
717 | *n_notkilled = 0; | |
718 | ||
719 | if (!found) | |
720 | return; | |
721 | ||
722 | clear(&killed); | |
183843cd DS |
723 | |
724 | for (p = found; p; p = p->next) { | |
725 | if (testmode) | |
ae9eebca DL |
726 | printf("Would send signal %d to %ld.\n", signal_nr, |
727 | (long)p->pid); | |
d62a17ae | 728 | else if (kill(p->pid, signal_nr) == 0) { |
183843cd | 729 | push(&killed, p->pid); |
d62a17ae | 730 | (*n_killed)++; |
183843cd | 731 | } else { |
ae9eebca DL |
732 | printf("%s: warning: failed to kill %ld: %s\n", |
733 | progname, (long)p->pid, strerror(errno)); | |
d62a17ae | 734 | (*n_notkilled)++; |
183843cd DS |
735 | } |
736 | } | |
737 | if (quietmode < 0 && killed) { | |
d62a17ae | 738 | printf("Stopped %s (pid", what_stop); |
183843cd | 739 | for (p = killed; p; p = p->next) |
ae9eebca | 740 | printf(" %ld", (long)p->pid); |
d62a17ae | 741 | putchar(')'); |
742 | if (retry_nr > 0) | |
743 | printf(", retry #%d", retry_nr); | |
744 | printf(".\n"); | |
183843cd DS |
745 | } |
746 | } | |
747 | ||
748 | ||
d62a17ae | 749 | static void set_what_stop(const char *str) |
183843cd DS |
750 | { |
751 | strncpy(what_stop, str, sizeof(what_stop)); | |
d62a17ae | 752 | what_stop[sizeof(what_stop) - 1] = '\0'; |
183843cd DS |
753 | } |
754 | ||
d62a17ae | 755 | static int run_stop_schedule(void) |
183843cd | 756 | { |
d62a17ae | 757 | int r, position, n_killed, n_notkilled, value, ratio, anykilled, |
758 | retry_nr; | |
183843cd DS |
759 | struct timeval stopat, before, after, interval, maxinterval; |
760 | ||
761 | if (testmode) { | |
762 | if (schedule != NULL) { | |
763 | printf("Ignoring --retry in test mode\n"); | |
764 | schedule = NULL; | |
765 | } | |
766 | } | |
767 | ||
768 | if (cmdname) | |
769 | set_what_stop(cmdname); | |
770 | else if (execname) | |
771 | set_what_stop(execname); | |
772 | else if (pidfile) | |
773 | sprintf(what_stop, "process in pidfile `%.200s'", pidfile); | |
774 | else if (userspec) | |
775 | sprintf(what_stop, "process(es) owned by `%.200s'", userspec); | |
776 | else | |
777 | fatal("internal error, please report"); | |
778 | ||
779 | anykilled = 0; | |
780 | retry_nr = 0; | |
c604467a | 781 | n_killed = 0; |
183843cd DS |
782 | |
783 | if (schedule == NULL) { | |
784 | do_stop(signal_nr, quietmode, &n_killed, &n_notkilled, 0); | |
785 | if (n_notkilled > 0 && quietmode <= 0) | |
786 | printf("%d pids were not killed\n", n_notkilled); | |
787 | if (n_killed) | |
788 | anykilled = 1; | |
789 | goto x_finished; | |
790 | } | |
791 | ||
d62a17ae | 792 | for (position = 0; position < schedule_length;) { |
793 | value = schedule[position].value; | |
183843cd DS |
794 | n_notkilled = 0; |
795 | ||
796 | switch (schedule[position].type) { | |
797 | ||
798 | case sched_goto: | |
799 | position = value; | |
800 | continue; | |
801 | ||
802 | case sched_signal: | |
d62a17ae | 803 | do_stop(value, quietmode, &n_killed, &n_notkilled, |
804 | retry_nr++); | |
183843cd DS |
805 | if (!n_killed) |
806 | goto x_finished; | |
807 | else | |
808 | anykilled = 1; | |
809 | goto next_item; | |
810 | ||
811 | case sched_timeout: | |
d62a17ae | 812 | /* We want to keep polling for the processes, to see if |
813 | * they've exited, | |
814 | * or until the timeout expires. | |
815 | * | |
816 | * This is a somewhat complicated algorithm to try to | |
817 | * ensure that we | |
818 | * notice reasonably quickly when all the processes have | |
819 | * exited, but | |
820 | * don't spend too much CPU time polling. In | |
821 | * particular, on a fast | |
822 | * machine with quick-exiting daemons we don't want to | |
823 | * delay system | |
824 | * shutdown too much, whereas on a slow one, or where | |
825 | * processes are | |
826 | * taking some time to exit, we want to increase the | |
827 | * polling | |
828 | * interval. | |
829 | * | |
830 | * The algorithm is as follows: we measure the elapsed | |
831 | * time it takes | |
832 | * to do one poll(), and wait a multiple of this time | |
833 | * for the next | |
834 | * poll. However, if that would put us past the end of | |
835 | * the timeout | |
836 | * period we wait only as long as the timeout period, | |
837 | * but in any case | |
838 | * we always wait at least MIN_POLL_INTERVAL (20ms). | |
839 | * The multiple | |
840 | * (`ratio') starts out as 2, and increases by 1 for | |
841 | * each poll to a | |
842 | * maximum of 10; so we use up to between 30% and 10% of | |
843 | * the | |
844 | * machine's resources (assuming a few reasonable things | |
845 | * about system | |
846 | * performance). | |
847 | */ | |
183843cd DS |
848 | xgettimeofday(&stopat); |
849 | stopat.tv_sec += value; | |
850 | ratio = 1; | |
851 | for (;;) { | |
852 | xgettimeofday(&before); | |
d62a17ae | 853 | if (timercmp(&before, &stopat, >)) |
183843cd DS |
854 | goto next_item; |
855 | ||
856 | do_stop(0, 1, &n_killed, &n_notkilled, 0); | |
857 | if (!n_killed) | |
858 | goto x_finished; | |
859 | ||
860 | xgettimeofday(&after); | |
861 | ||
d62a17ae | 862 | if (!timercmp(&after, &stopat, <)) |
183843cd DS |
863 | goto next_item; |
864 | ||
865 | if (ratio < 10) | |
866 | ratio++; | |
867 | ||
9d303b37 DL |
868 | TVCALC(interval, |
869 | ratio * (TVELEM(&after) - TVELEM(&before) | |
870 | + TVADJUST)); | |
871 | TVCALC(maxinterval, | |
872 | TVELEM(&stopat) - TVELEM(&after) | |
873 | + TVADJUST); | |
183843cd | 874 | |
d62a17ae | 875 | if (timercmp(&interval, &maxinterval, >)) |
183843cd DS |
876 | interval = maxinterval; |
877 | ||
d62a17ae | 878 | if (interval.tv_sec == 0 |
879 | && interval.tv_usec <= MIN_POLL_INTERVAL) | |
880 | interval.tv_usec = MIN_POLL_INTERVAL; | |
183843cd | 881 | |
d62a17ae | 882 | r = select(0, 0, 0, 0, &interval); |
183843cd DS |
883 | if (r < 0 && errno != EINTR) |
884 | fatal("select() failed for pause: %s", | |
885 | strerror(errno)); | |
886 | } | |
887 | ||
888 | default: | |
889 | assert(!"schedule[].type value must be valid"); | |
183843cd DS |
890 | } |
891 | ||
892 | next_item: | |
893 | position++; | |
894 | } | |
895 | ||
896 | if (quietmode <= 0) | |
897 | printf("Program %s, %d process(es), refused to die.\n", | |
898 | what_stop, n_killed); | |
899 | ||
900 | return 2; | |
901 | ||
902 | x_finished: | |
903 | if (!anykilled) { | |
904 | if (quietmode <= 0) | |
d62a17ae | 905 | printf("No %s found running; none killed.\n", |
906 | what_stop); | |
183843cd DS |
907 | return exitnodo; |
908 | } else { | |
909 | return 0; | |
910 | } | |
911 | } | |
912 | ||
913 | /* | |
914 | int main(int argc, char **argv) NONRETURNING; | |
915 | */ | |
916 | ||
d62a17ae | 917 | int main(int argc, char **argv) |
183843cd DS |
918 | { |
919 | progname = argv[0]; | |
920 | ||
921 | LIST_INIT(&namespace_head); | |
922 | ||
923 | parse_options(argc, argv); | |
924 | argc -= optind; | |
925 | argv += optind; | |
926 | ||
927 | if (execname && stat(execname, &exec_stat)) | |
928 | fatal("stat %s: %s", execname, strerror(errno)); | |
929 | ||
930 | if (userspec && sscanf(userspec, "%d", &user_id) != 1) { | |
931 | struct passwd *pw; | |
932 | ||
933 | pw = getpwnam(userspec); | |
934 | if (!pw) | |
935 | fatal("user `%s' not found\n", userspec); | |
936 | ||
937 | user_id = pw->pw_uid; | |
938 | } | |
939 | ||
940 | if (changegroup && sscanf(changegroup, "%d", &runas_gid) != 1) { | |
941 | struct group *gr = getgrnam(changegroup); | |
942 | if (!gr) | |
943 | fatal("group `%s' not found\n", changegroup); | |
944 | runas_gid = gr->gr_gid; | |
945 | } | |
946 | if (changeuser && sscanf(changeuser, "%d", &runas_uid) != 1) { | |
947 | struct passwd *pw = getpwnam(changeuser); | |
948 | if (!pw) | |
949 | fatal("user `%s' not found\n", changeuser); | |
950 | runas_uid = pw->pw_uid; | |
d62a17ae | 951 | if (changegroup |
952 | == NULL) { /* pass the default group of this user */ | |
183843cd DS |
953 | changegroup = ""; /* just empty */ |
954 | runas_gid = pw->pw_gid; | |
955 | } | |
956 | } | |
957 | ||
958 | if (stop) { | |
959 | int i = run_stop_schedule(); | |
960 | exit(i); | |
961 | } | |
962 | ||
963 | do_findprocs(); | |
964 | ||
965 | if (found) { | |
966 | if (quietmode <= 0) | |
967 | printf("%s already running.\n", execname); | |
968 | exit(exitnodo); | |
969 | } | |
970 | if (testmode) { | |
971 | printf("Would start %s ", startas); | |
972 | while (argc-- > 0) | |
973 | printf("%s ", *argv++); | |
974 | if (changeuser != NULL) { | |
975 | printf(" (as user %s[%d]", changeuser, runas_uid); | |
976 | if (changegroup != NULL) | |
d62a17ae | 977 | printf(", and group %s[%d])", changegroup, |
978 | runas_gid); | |
183843cd DS |
979 | else |
980 | printf(")"); | |
981 | } | |
982 | if (changeroot != NULL) | |
983 | printf(" in directory %s", changeroot); | |
984 | if (nicelevel) | |
985 | printf(", and add %i to the priority", nicelevel); | |
986 | printf(".\n"); | |
987 | exit(0); | |
988 | } | |
989 | if (quietmode < 0) | |
990 | printf("Starting %s...\n", startas); | |
991 | *--argv = startas; | |
992 | if (changeroot != NULL) { | |
993 | if (chdir(changeroot) < 0) | |
994 | fatal("Unable to chdir() to %s", changeroot); | |
995 | if (chroot(changeroot) < 0) | |
996 | fatal("Unable to chroot() to %s", changeroot); | |
997 | } | |
998 | if (changeuser != NULL) { | |
d62a17ae | 999 | if (setgid(runas_gid)) |
1000 | fatal("Unable to set gid to %d", runas_gid); | |
183843cd | 1001 | if (initgroups(changeuser, runas_gid)) |
d62a17ae | 1002 | fatal("Unable to set initgroups() with gid %d", |
1003 | runas_gid); | |
183843cd DS |
1004 | if (setuid(runas_uid)) |
1005 | fatal("Unable to set uid to %s", changeuser); | |
1006 | } | |
1007 | ||
1008 | if (background) { /* ok, we need to detach this process */ | |
1009 | int i, fd; | |
1010 | if (quietmode < 0) | |
0437e105 | 1011 | printf("Detaching to start %s...", startas); |
183843cd | 1012 | i = fork(); |
d62a17ae | 1013 | if (i < 0) { |
183843cd DS |
1014 | fatal("Unable to fork.\n"); |
1015 | } | |
1016 | if (i) { /* parent */ | |
1017 | if (quietmode < 0) | |
1018 | printf("done.\n"); | |
1019 | exit(0); | |
1020 | } | |
d62a17ae | 1021 | /* child continues here */ |
1022 | /* now close all extra fds */ | |
1023 | for (i = getdtablesize() - 1; i >= 0; --i) | |
1024 | close(i); | |
1025 | /* change tty */ | |
183843cd | 1026 | fd = open("/dev/tty", O_RDWR); |
9b606d6c | 1027 | if (fd >= 0) { |
b0bde9f3 A |
1028 | if (ioctl(fd, TIOCNOTTY, 0) < 0) |
1029 | printf("ioctl TIOCNOTTY failed: %s\n", | |
1030 | strerror(errno)); | |
9b606d6c | 1031 | close(fd); |
1032 | } | |
183843cd | 1033 | chdir("/"); |
d62a17ae | 1034 | umask(022); /* set a default for dumb programs */ |
1035 | setpgid(0, 0); /* set the process group */ | |
1036 | fd = open("/dev/null", O_RDWR); /* stdin */ | |
657f9948 | 1037 | if (fd >= 0) { |
1038 | dup(fd); /* stdout */ | |
1039 | dup(fd); /* stderr */ | |
1040 | } | |
183843cd DS |
1041 | } |
1042 | if (nicelevel) { | |
1043 | errno = 0; | |
1044 | if (nice(nicelevel) < 0 && errno) | |
1045 | fatal("Unable to alter nice level by %i: %s", nicelevel, | |
d62a17ae | 1046 | strerror(errno)); |
183843cd | 1047 | } |
d62a17ae | 1048 | if (mpidfile |
1049 | && pidfile != NULL) { /* user wants _us_ to make the pidfile :) */ | |
183843cd DS |
1050 | FILE *pidf = fopen(pidfile, "w"); |
1051 | pid_t pidt = getpid(); | |
1052 | if (pidf == NULL) | |
d62a17ae | 1053 | fatal("Unable to open pidfile `%s' for writing: %s", |
1054 | pidfile, strerror(errno)); | |
ae9eebca | 1055 | fprintf(pidf, "%ld\n", (long)pidt); |
183843cd DS |
1056 | fclose(pidf); |
1057 | } | |
1058 | set_namespaces(); | |
1059 | execv(startas, argv); | |
1060 | fatal("Unable to start %s: %s", startas, strerror(errno)); | |
1061 | } |