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