1 | /* vi: set sw=4 ts=4: */
|
---|
2 | /*
|
---|
3 | * Mini start-stop-daemon implementation(s) for busybox
|
---|
4 | *
|
---|
5 | * Written by Marek Michalkiewicz <marekm@i17linuxb.ists.pwr.wroc.pl>,
|
---|
6 | * Adapted for busybox David Kimdon <dwhedon@gordian.com>
|
---|
7 | *
|
---|
8 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
|
---|
9 | */
|
---|
10 |
|
---|
11 | /* NB: we have a problem here with /proc/NN/exe usage, similar to
|
---|
12 | * one fixed in killall/pidof */
|
---|
13 |
|
---|
14 | #include <getopt.h>
|
---|
15 | #include <sys/resource.h>
|
---|
16 |
|
---|
17 | /* Override ENABLE_FEATURE_PIDFILE */
|
---|
18 | #define WANT_PIDFILE 1
|
---|
19 | #include "libbb.h"
|
---|
20 |
|
---|
21 | static int signal_nr = 15;
|
---|
22 | static int user_id = -1;
|
---|
23 | static char *userspec;
|
---|
24 | static char *cmdname;
|
---|
25 | static char *execname;
|
---|
26 | static char *pidfile;
|
---|
27 | static smallint quiet;
|
---|
28 |
|
---|
29 | struct pid_list {
|
---|
30 | struct pid_list *next;
|
---|
31 | pid_t pid;
|
---|
32 | };
|
---|
33 |
|
---|
34 | static struct pid_list *found;
|
---|
35 |
|
---|
36 | static int pid_is_exec(pid_t pid, const char *name)
|
---|
37 | {
|
---|
38 | char buf[sizeof("/proc//exe") + sizeof(int)*3];
|
---|
39 | char *execbuf;
|
---|
40 | int n;
|
---|
41 |
|
---|
42 | sprintf(buf, "/proc/%u/exe", pid);
|
---|
43 | n = strlen(name) + 1;
|
---|
44 | execbuf = xzalloc(n + 1);
|
---|
45 | readlink(buf, execbuf, n);
|
---|
46 |
|
---|
47 | /* if readlink fails, execbuf still contains "" */
|
---|
48 | n = strcmp(execbuf, name);
|
---|
49 | if (ENABLE_FEATURE_CLEAN_UP)
|
---|
50 | free(execbuf);
|
---|
51 | return !n; /* nonzero (true) if execbuf == name */
|
---|
52 | }
|
---|
53 |
|
---|
54 | static int pid_is_user(int pid, int uid)
|
---|
55 | {
|
---|
56 | struct stat sb;
|
---|
57 | char buf[sizeof("/proc/") + sizeof(int)*3];
|
---|
58 |
|
---|
59 | sprintf(buf, "/proc/%u", pid);
|
---|
60 | if (stat(buf, &sb) != 0)
|
---|
61 | return 0;
|
---|
62 | return (sb.st_uid == uid);
|
---|
63 | }
|
---|
64 |
|
---|
65 | static int pid_is_cmd(pid_t pid, const char *name)
|
---|
66 | {
|
---|
67 | char fname[sizeof("/proc//stat") + sizeof(int)*3];
|
---|
68 | char *buf;
|
---|
69 | int r = 0;
|
---|
70 |
|
---|
71 | sprintf(fname, "/proc/%u/stat", pid);
|
---|
72 | buf = xmalloc_open_read_close(fname, NULL);
|
---|
73 | if (buf) {
|
---|
74 | char *p = strchr(buf, '(');
|
---|
75 | if (p) {
|
---|
76 | char *pe = strrchr(++p, ')');
|
---|
77 | if (pe) {
|
---|
78 | *pe = '\0';
|
---|
79 | r = !strcmp(p, name);
|
---|
80 | }
|
---|
81 | }
|
---|
82 | free(buf);
|
---|
83 | }
|
---|
84 | return r;
|
---|
85 | }
|
---|
86 |
|
---|
87 | static void check(int pid)
|
---|
88 | {
|
---|
89 | struct pid_list *p;
|
---|
90 |
|
---|
91 | if (execname && !pid_is_exec(pid, execname)) {
|
---|
92 | return;
|
---|
93 | }
|
---|
94 | if (userspec && !pid_is_user(pid, user_id)) {
|
---|
95 | return;
|
---|
96 | }
|
---|
97 | if (cmdname && !pid_is_cmd(pid, cmdname)) {
|
---|
98 | return;
|
---|
99 | }
|
---|
100 | p = xmalloc(sizeof(*p));
|
---|
101 | p->next = found;
|
---|
102 | p->pid = pid;
|
---|
103 | found = p;
|
---|
104 | }
|
---|
105 |
|
---|
106 | static void do_pidfile(void)
|
---|
107 | {
|
---|
108 | FILE *f;
|
---|
109 | unsigned pid;
|
---|
110 |
|
---|
111 | f = fopen(pidfile, "r");
|
---|
112 | if (f) {
|
---|
113 | if (fscanf(f, "%u", &pid) == 1)
|
---|
114 | check(pid);
|
---|
115 | fclose(f);
|
---|
116 | } else if (errno != ENOENT)
|
---|
117 | bb_perror_msg_and_die("open pidfile %s", pidfile);
|
---|
118 | }
|
---|
119 |
|
---|
120 | static void do_procinit(void)
|
---|
121 | {
|
---|
122 | DIR *procdir;
|
---|
123 | struct dirent *entry;
|
---|
124 | int foundany, pid;
|
---|
125 |
|
---|
126 | if (pidfile) {
|
---|
127 | do_pidfile();
|
---|
128 | return;
|
---|
129 | }
|
---|
130 |
|
---|
131 | procdir = xopendir("/proc");
|
---|
132 |
|
---|
133 | foundany = 0;
|
---|
134 | while ((entry = readdir(procdir)) != NULL) {
|
---|
135 | pid = bb_strtou(entry->d_name, NULL, 10);
|
---|
136 | if (errno)
|
---|
137 | continue;
|
---|
138 | foundany++;
|
---|
139 | check(pid);
|
---|
140 | }
|
---|
141 | closedir(procdir);
|
---|
142 | if (!foundany)
|
---|
143 | bb_error_msg_and_die("nothing in /proc - not mounted?");
|
---|
144 | }
|
---|
145 |
|
---|
146 | static int do_stop(void)
|
---|
147 | {
|
---|
148 | char *what;
|
---|
149 | struct pid_list *p;
|
---|
150 | int killed = 0;
|
---|
151 |
|
---|
152 | do_procinit();
|
---|
153 |
|
---|
154 | if (cmdname) {
|
---|
155 | if (ENABLE_FEATURE_CLEAN_UP) what = xstrdup(cmdname);
|
---|
156 | if (!ENABLE_FEATURE_CLEAN_UP) what = cmdname;
|
---|
157 | } else if (execname) {
|
---|
158 | if (ENABLE_FEATURE_CLEAN_UP) what = xstrdup(execname);
|
---|
159 | if (!ENABLE_FEATURE_CLEAN_UP) what = execname;
|
---|
160 | } else if (pidfile)
|
---|
161 | what = xasprintf("process in pidfile '%s'", pidfile);
|
---|
162 | else if (userspec)
|
---|
163 | what = xasprintf("process(es) owned by '%s'", userspec);
|
---|
164 | else
|
---|
165 | bb_error_msg_and_die("internal error, please report");
|
---|
166 |
|
---|
167 | if (!found) {
|
---|
168 | if (!quiet)
|
---|
169 | printf("no %s found; none killed\n", what);
|
---|
170 | killed = -1;
|
---|
171 | goto ret;
|
---|
172 | }
|
---|
173 | for (p = found; p; p = p->next) {
|
---|
174 | if (kill(p->pid, signal_nr) == 0) {
|
---|
175 | p->pid = - p->pid;
|
---|
176 | killed++;
|
---|
177 | } else {
|
---|
178 | bb_perror_msg("warning: killing process %u", p->pid);
|
---|
179 | }
|
---|
180 | }
|
---|
181 | if (!quiet && killed) {
|
---|
182 | printf("stopped %s (pid", what);
|
---|
183 | for (p = found; p; p = p->next)
|
---|
184 | if (p->pid < 0)
|
---|
185 | printf(" %u", - p->pid);
|
---|
186 | puts(")");
|
---|
187 | }
|
---|
188 | ret:
|
---|
189 | if (ENABLE_FEATURE_CLEAN_UP)
|
---|
190 | free(what);
|
---|
191 | return killed;
|
---|
192 | }
|
---|
193 |
|
---|
194 | #if ENABLE_FEATURE_START_STOP_DAEMON_LONG_OPTIONS
|
---|
195 | static const char start_stop_daemon_longopts[] ALIGN1 =
|
---|
196 | "stop\0" No_argument "K"
|
---|
197 | "start\0" No_argument "S"
|
---|
198 | "background\0" No_argument "b"
|
---|
199 | "quiet\0" No_argument "q"
|
---|
200 | "make-pidfile\0" No_argument "m"
|
---|
201 | #if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
|
---|
202 | "oknodo\0" No_argument "o"
|
---|
203 | "verbose\0" No_argument "v"
|
---|
204 | "nicelevel\0" Required_argument "N"
|
---|
205 | #endif
|
---|
206 | "startas\0" Required_argument "a"
|
---|
207 | "name\0" Required_argument "n"
|
---|
208 | "signal\0" Required_argument "s"
|
---|
209 | "user\0" Required_argument "u"
|
---|
210 | "chuid\0" Required_argument "c"
|
---|
211 | "exec\0" Required_argument "x"
|
---|
212 | "pidfile\0" Required_argument "p"
|
---|
213 | #if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
|
---|
214 | "retry\0" Required_argument "R"
|
---|
215 | #endif
|
---|
216 | ;
|
---|
217 | #endif
|
---|
218 |
|
---|
219 | enum {
|
---|
220 | CTX_STOP = 0x1,
|
---|
221 | CTX_START = 0x2,
|
---|
222 | OPT_BACKGROUND = 0x4, // -b
|
---|
223 | OPT_QUIET = 0x8, // -q
|
---|
224 | OPT_MAKEPID = 0x10, // -m
|
---|
225 | OPT_a = 0x20, // -a
|
---|
226 | OPT_n = 0x40, // -n
|
---|
227 | OPT_s = 0x80, // -s
|
---|
228 | OPT_u = 0x100, // -u
|
---|
229 | OPT_c = 0x200, // -c
|
---|
230 | OPT_x = 0x400, // -x
|
---|
231 | OPT_p = 0x800, // -p
|
---|
232 | OPT_OKNODO = 0x1000 * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -o
|
---|
233 | OPT_VERBOSE = 0x2000 * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -v
|
---|
234 | OPT_NICELEVEL = 0x4000 * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -N
|
---|
235 | };
|
---|
236 |
|
---|
237 | int start_stop_daemon_main(int argc, char **argv);
|
---|
238 | int start_stop_daemon_main(int argc, char **argv)
|
---|
239 | {
|
---|
240 | unsigned opt;
|
---|
241 | char *signame;
|
---|
242 | char *startas;
|
---|
243 | char *chuid;
|
---|
244 | #if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
|
---|
245 | // char *retry_arg = NULL;
|
---|
246 | // int retries = -1;
|
---|
247 | char *opt_N;
|
---|
248 | #endif
|
---|
249 | #if ENABLE_FEATURE_START_STOP_DAEMON_LONG_OPTIONS
|
---|
250 | applet_long_options = start_stop_daemon_longopts;
|
---|
251 | #endif
|
---|
252 |
|
---|
253 | /* Check required one context option was given */
|
---|
254 | opt_complementary = "K:S:K--S:S--K:m?p:K?xpun:S?xa";
|
---|
255 | opt = getopt32(argv, "KSbqma:n:s:u:c:x:p:"
|
---|
256 | USE_FEATURE_START_STOP_DAEMON_FANCY("ovN:"),
|
---|
257 | // USE_FEATURE_START_STOP_DAEMON_FANCY("ovN:R:"),
|
---|
258 | &startas, &cmdname, &signame, &userspec, &chuid, &execname, &pidfile
|
---|
259 | USE_FEATURE_START_STOP_DAEMON_FANCY(,&opt_N)
|
---|
260 | // USE_FEATURE_START_STOP_DAEMON_FANCY(,&retry_arg)
|
---|
261 | );
|
---|
262 |
|
---|
263 | quiet = (opt & OPT_QUIET) && !(opt & OPT_VERBOSE);
|
---|
264 |
|
---|
265 | if (opt & OPT_s) {
|
---|
266 | signal_nr = get_signum(signame);
|
---|
267 | if (signal_nr < 0) bb_show_usage();
|
---|
268 | }
|
---|
269 |
|
---|
270 | if (!(opt & OPT_a))
|
---|
271 | startas = execname;
|
---|
272 |
|
---|
273 | // USE_FEATURE_START_STOP_DAEMON_FANCY(
|
---|
274 | // if (retry_arg)
|
---|
275 | // retries = xatoi_u(retry_arg);
|
---|
276 | // )
|
---|
277 | argc -= optind;
|
---|
278 | argv += optind;
|
---|
279 |
|
---|
280 | if (userspec) {
|
---|
281 | user_id = bb_strtou(userspec, NULL, 10);
|
---|
282 | if (errno)
|
---|
283 | user_id = xuname2uid(userspec);
|
---|
284 | }
|
---|
285 |
|
---|
286 | if (opt & CTX_STOP) {
|
---|
287 | int i = do_stop();
|
---|
288 | return (opt & OPT_OKNODO) ? 0 : (i <= 0);
|
---|
289 | }
|
---|
290 |
|
---|
291 | do_procinit();
|
---|
292 |
|
---|
293 | if (found) {
|
---|
294 | if (!quiet)
|
---|
295 | printf("%s already running\n%d\n", execname, found->pid);
|
---|
296 | return !(opt & OPT_OKNODO);
|
---|
297 | }
|
---|
298 | *--argv = startas;
|
---|
299 | if (opt & OPT_BACKGROUND) {
|
---|
300 | #if BB_MMU
|
---|
301 | bb_daemonize(0);
|
---|
302 | #else
|
---|
303 | pid_t pid = vfork();
|
---|
304 | if (pid < 0) /* error */
|
---|
305 | bb_perror_msg_and_die("vfork");
|
---|
306 | if (pid != 0) {
|
---|
307 | /* parent */
|
---|
308 | /* why _exit? the child may have changed the stack,
|
---|
309 | * so "return 0" may do bad things */
|
---|
310 | _exit(0);
|
---|
311 | }
|
---|
312 | /* child */
|
---|
313 | setsid(); /* detach from controlling tty */
|
---|
314 | /* Redirect stdio to /dev/null, close extra FDs.
|
---|
315 | * We do not actually daemonize because of DAEMON_ONLY_SANITIZE */
|
---|
316 | bb_daemonize_or_rexec(
|
---|
317 | DAEMON_DEVNULL_STDIO
|
---|
318 | + DAEMON_CLOSE_EXTRA_FDS
|
---|
319 | + DAEMON_ONLY_SANITIZE,
|
---|
320 | NULL /* argv, unused */ );
|
---|
321 | #endif
|
---|
322 | }
|
---|
323 | if (opt & OPT_MAKEPID) {
|
---|
324 | /* user wants _us_ to make the pidfile */
|
---|
325 | write_pidfile(pidfile);
|
---|
326 | }
|
---|
327 | if (opt & OPT_c) {
|
---|
328 | struct bb_uidgid_t ugid;
|
---|
329 | parse_chown_usergroup_or_die(&ugid, chuid);
|
---|
330 | if (ugid.gid != (gid_t) -1) xsetgid(ugid.gid);
|
---|
331 | if (ugid.uid != (uid_t) -1) xsetuid(ugid.uid);
|
---|
332 | }
|
---|
333 | #if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
|
---|
334 | if (opt & OPT_NICELEVEL) {
|
---|
335 | /* Set process priority */
|
---|
336 | int prio = getpriority(PRIO_PROCESS, 0) + xatoi_range(opt_N, INT_MIN/2, INT_MAX/2);
|
---|
337 | if (setpriority(PRIO_PROCESS, 0, prio) < 0) {
|
---|
338 | bb_perror_msg_and_die("setpriority(%d)", prio);
|
---|
339 | }
|
---|
340 | }
|
---|
341 | #endif
|
---|
342 | execv(startas, argv);
|
---|
343 | bb_perror_msg_and_die("cannot start %s", startas);
|
---|
344 | }
|
---|