Busybox: Upgrade to 1.21.1 (stable). lsof active.
[tomato.git] / release / src / router / busybox / runit / chpst.c
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1 /*
2 Copyright (c) 2001-2006, Gerrit Pape
3 All rights reserved.
5 Redistribution and use in source and binary forms, with or without
6 modification, are permitted provided that the following conditions are met:
8 1. Redistributions of source code must retain the above copyright notice,
9 this list of conditions and the following disclaimer.
10 2. Redistributions in binary form must reproduce the above copyright
11 notice, this list of conditions and the following disclaimer in the
12 documentation and/or other materials provided with the distribution.
13 3. The name of the author may not be used to endorse or promote products
14 derived from this software without specific prior written permission.
16 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
17 WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
19 EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22 OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23 WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24 OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25 ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 /* Busyboxed by Denys Vlasenko <vda.linux@googlemail.com> */
29 /* Dependencies on runit_lib.c removed */
31 //usage:#define chpst_trivial_usage
32 //usage: "[-vP012] [-u USER[:GRP]] [-U USER[:GRP]] [-e DIR]\n"
33 //usage: " [-/ DIR] [-n NICE] [-m BYTES] [-d BYTES] [-o N]\n"
34 //usage: " [-p N] [-f BYTES] [-c BYTES] PROG ARGS"
35 //usage:#define chpst_full_usage "\n\n"
36 //usage: "Change the process state, run PROG\n"
37 //usage: "\n -u USER[:GRP] Set uid and gid"
38 //usage: "\n -U USER[:GRP] Set $UID and $GID in environment"
39 //usage: "\n -e DIR Set environment variables as specified by files"
40 //usage: "\n in DIR: file=1st_line_of_file"
41 //usage: "\n -/ DIR Chroot to DIR"
42 //usage: "\n -n NICE Add NICE to nice value"
43 //usage: "\n -m BYTES Same as -d BYTES -s BYTES -l BYTES"
44 //usage: "\n -d BYTES Limit data segment"
45 //usage: "\n -o N Limit number of open files per process"
46 //usage: "\n -p N Limit number of processes per uid"
47 //usage: "\n -f BYTES Limit output file sizes"
48 //usage: "\n -c BYTES Limit core file size"
49 //usage: "\n -v Verbose"
50 //usage: "\n -P Create new process group"
51 //usage: "\n -0 Close stdin"
52 //usage: "\n -1 Close stdout"
53 //usage: "\n -2 Close stderr"
54 //usage:
55 //usage:#define envdir_trivial_usage
56 //usage: "DIR PROG ARGS"
57 //usage:#define envdir_full_usage "\n\n"
58 //usage: "Set various environment variables as specified by files\n"
59 //usage: "in the directory DIR, run PROG"
60 //usage:
61 //usage:#define envuidgid_trivial_usage
62 //usage: "USER PROG ARGS"
63 //usage:#define envuidgid_full_usage "\n\n"
64 //usage: "Set $UID to USER's uid and $GID to USER's gid, run PROG"
65 //usage:
66 //usage:#define setuidgid_trivial_usage
67 //usage: "USER PROG ARGS"
68 //usage:#define setuidgid_full_usage "\n\n"
69 //usage: "Set uid and gid to USER's uid and gid, drop supplementary group ids,\n"
70 //usage: "run PROG"
71 //usage:
72 //usage:#define softlimit_trivial_usage
73 //usage: "[-a BYTES] [-m BYTES] [-d BYTES] [-s BYTES] [-l BYTES]\n"
74 //usage: " [-f BYTES] [-c BYTES] [-r BYTES] [-o N] [-p N] [-t N]\n"
75 //usage: " PROG ARGS"
76 //usage:#define softlimit_full_usage "\n\n"
77 //usage: "Set soft resource limits, then run PROG\n"
78 //usage: "\n -a BYTES Limit total size of all segments"
79 //usage: "\n -m BYTES Same as -d BYTES -s BYTES -l BYTES -a BYTES"
80 //usage: "\n -d BYTES Limit data segment"
81 //usage: "\n -s BYTES Limit stack segment"
82 //usage: "\n -l BYTES Limit locked memory size"
83 //usage: "\n -o N Limit number of open files per process"
84 //usage: "\n -p N Limit number of processes per uid"
85 //usage: "\nOptions controlling file sizes:"
86 //usage: "\n -f BYTES Limit output file sizes"
87 //usage: "\n -c BYTES Limit core file size"
88 //usage: "\nEfficiency opts:"
89 //usage: "\n -r BYTES Limit resident set size"
90 //usage: "\n -t N Limit CPU time, process receives"
91 //usage: "\n a SIGXCPU after N seconds"
93 #include "libbb.h"
94 #include <sys/resource.h> /* getrlimit */
97 Five applets here: chpst, envdir, envuidgid, setuidgid, softlimit.
99 Only softlimit and chpst are taking options:
101 # common
102 -o N Limit number of open files per process
103 -p N Limit number of processes per uid
104 -m BYTES Same as -d BYTES -s BYTES -l BYTES [-a BYTES]
105 -d BYTES Limit data segment
106 -f BYTES Limit output file sizes
107 -c BYTES Limit core file size
108 # softlimit
109 -a BYTES Limit total size of all segments
110 -s BYTES Limit stack segment
111 -l BYTES Limit locked memory size
112 -r BYTES Limit resident set size
113 -t N Limit CPU time
114 # chpst
115 -u USER[:GRP] Set uid and gid
116 -U USER[:GRP] Set $UID and $GID in environment
117 -e DIR Set environment variables as specified by files in DIR
118 -/ DIR Chroot to DIR
119 -n NICE Add NICE to nice value
120 -v Verbose
121 -P Create new process group
122 -0 -1 -2 Close fd 0,1,2
124 Even though we accept all these options for both softlimit and chpst,
125 they are not to be advertised on their help texts.
126 We have enough problems with feature creep in other people's
127 software, don't want to add our own.
129 envdir, envuidgid, setuidgid take no options, but they reuse code which
130 handles -e, -U and -u.
133 enum {
134 OPT_a = (1 << 0) * ENABLE_SOFTLIMIT,
135 OPT_c = (1 << 1) * (ENABLE_SOFTLIMIT || ENABLE_CHPST),
136 OPT_d = (1 << 2) * (ENABLE_SOFTLIMIT || ENABLE_CHPST),
137 OPT_f = (1 << 3) * (ENABLE_SOFTLIMIT || ENABLE_CHPST),
138 OPT_l = (1 << 4) * ENABLE_SOFTLIMIT,
139 OPT_m = (1 << 5) * (ENABLE_SOFTLIMIT || ENABLE_CHPST),
140 OPT_o = (1 << 6) * (ENABLE_SOFTLIMIT || ENABLE_CHPST),
141 OPT_p = (1 << 7) * (ENABLE_SOFTLIMIT || ENABLE_CHPST),
142 OPT_r = (1 << 8) * ENABLE_SOFTLIMIT,
143 OPT_s = (1 << 9) * ENABLE_SOFTLIMIT,
144 OPT_t = (1 << 10) * ENABLE_SOFTLIMIT,
145 OPT_u = (1 << 11) * (ENABLE_CHPST || ENABLE_SETUIDGID),
146 OPT_U = (1 << 12) * (ENABLE_CHPST || ENABLE_ENVUIDGID),
147 OPT_e = (1 << 13) * (ENABLE_CHPST || ENABLE_ENVDIR),
148 OPT_root = (1 << 14) * ENABLE_CHPST,
149 OPT_n = (1 << 15) * ENABLE_CHPST,
150 OPT_v = (1 << 16) * ENABLE_CHPST,
151 OPT_P = (1 << 17) * ENABLE_CHPST,
152 OPT_0 = (1 << 18) * ENABLE_CHPST,
153 OPT_1 = (1 << 19) * ENABLE_CHPST,
154 OPT_2 = (1 << 20) * ENABLE_CHPST,
157 /* TODO: use recursive_action? */
158 static NOINLINE void edir(const char *directory_name)
160 int wdir;
161 DIR *dir;
162 struct dirent *d;
163 int fd;
165 wdir = xopen(".", O_RDONLY | O_NDELAY);
166 xchdir(directory_name);
167 dir = xopendir(".");
168 for (;;) {
169 char buf[256];
170 char *tail;
171 int size;
173 errno = 0;
174 d = readdir(dir);
175 if (!d) {
176 if (errno)
177 bb_perror_msg_and_die("readdir %s",
178 directory_name);
179 break;
181 if (d->d_name[0] == '.')
182 continue;
183 fd = open(d->d_name, O_RDONLY | O_NDELAY);
184 if (fd < 0) {
185 if ((errno == EISDIR) && directory_name) {
186 if (option_mask32 & OPT_v)
187 bb_perror_msg("warning: %s/%s is a directory",
188 directory_name, d->d_name);
189 continue;
191 bb_perror_msg_and_die("open %s/%s",
192 directory_name, d->d_name);
194 size = full_read(fd, buf, sizeof(buf)-1);
195 close(fd);
196 if (size < 0)
197 bb_perror_msg_and_die("read %s/%s",
198 directory_name, d->d_name);
199 if (size == 0) {
200 unsetenv(d->d_name);
201 continue;
203 buf[size] = '\n';
204 tail = strchr(buf, '\n');
205 /* skip trailing whitespace */
206 while (1) {
207 *tail = '\0';
208 tail--;
209 if (tail < buf || !isspace(*tail))
210 break;
212 xsetenv(d->d_name, buf);
214 closedir(dir);
215 if (fchdir(wdir) == -1)
216 bb_perror_msg_and_die("fchdir");
217 close(wdir);
220 static void limit(int what, long l)
222 struct rlimit r;
224 /* Never fails under Linux (except if you pass it bad arguments) */
225 getrlimit(what, &r);
226 if ((l < 0) || (l > r.rlim_max))
227 r.rlim_cur = r.rlim_max;
228 else
229 r.rlim_cur = l;
230 if (setrlimit(what, &r) == -1)
231 bb_perror_msg_and_die("setrlimit");
234 int chpst_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
235 int chpst_main(int argc UNUSED_PARAM, char **argv)
237 struct bb_uidgid_t ugid;
238 char *set_user = set_user; /* for compiler */
239 char *env_user = env_user;
240 char *env_dir = env_dir;
241 char *root;
242 char *nicestr;
243 unsigned limita;
244 unsigned limitc;
245 unsigned limitd;
246 unsigned limitf;
247 unsigned limitl;
248 unsigned limitm;
249 unsigned limito;
250 unsigned limitp;
251 unsigned limitr;
252 unsigned limits;
253 unsigned limitt;
254 unsigned opt;
256 if ((ENABLE_CHPST && applet_name[0] == 'c')
257 || (ENABLE_SOFTLIMIT && applet_name[1] == 'o')
259 // FIXME: can we live with int-sized limits?
260 // can we live with 40000 days?
261 // if yes -> getopt converts strings to numbers for us
262 opt_complementary = "-1:a+:c+:d+:f+:l+:m+:o+:p+:r+:s+:t+";
263 opt = getopt32(argv, "+a:c:d:f:l:m:o:p:r:s:t:u:U:e:"
264 IF_CHPST("/:n:vP012"),
265 &limita, &limitc, &limitd, &limitf, &limitl,
266 &limitm, &limito, &limitp, &limitr, &limits, &limitt,
267 &set_user, &env_user, &env_dir
268 IF_CHPST(, &root, &nicestr));
269 argv += optind;
270 if (opt & OPT_m) { // -m means -asld
271 limita = limits = limitl = limitd = limitm;
272 opt |= (OPT_s | OPT_l | OPT_a | OPT_d);
274 } else {
275 option_mask32 = opt = 0;
276 argv++;
277 if (!*argv)
278 bb_show_usage();
281 // envdir?
282 if (ENABLE_ENVDIR && applet_name[3] == 'd') {
283 env_dir = *argv++;
284 opt |= OPT_e;
287 // setuidgid?
288 if (ENABLE_SETUIDGID && applet_name[1] == 'e') {
289 set_user = *argv++;
290 opt |= OPT_u;
293 // envuidgid?
294 if (ENABLE_ENVUIDGID && applet_name[0] == 'e' && applet_name[3] == 'u') {
295 env_user = *argv++;
296 opt |= OPT_U;
299 // we must have PROG [ARGS]
300 if (!*argv)
301 bb_show_usage();
303 // set limits
304 if (opt & OPT_d) {
305 #ifdef RLIMIT_DATA
306 limit(RLIMIT_DATA, limitd);
307 #else
308 if (opt & OPT_v)
309 bb_error_msg("system does not support RLIMIT_%s",
310 "DATA");
311 #endif
313 if (opt & OPT_s) {
314 #ifdef RLIMIT_STACK
315 limit(RLIMIT_STACK, limits);
316 #else
317 if (opt & OPT_v)
318 bb_error_msg("system does not support RLIMIT_%s",
319 "STACK");
320 #endif
322 if (opt & OPT_l) {
323 #ifdef RLIMIT_MEMLOCK
324 limit(RLIMIT_MEMLOCK, limitl);
325 #else
326 if (opt & OPT_v)
327 bb_error_msg("system does not support RLIMIT_%s",
328 "MEMLOCK");
329 #endif
331 if (opt & OPT_a) {
332 #ifdef RLIMIT_VMEM
333 limit(RLIMIT_VMEM, limita);
334 #else
335 #ifdef RLIMIT_AS
336 limit(RLIMIT_AS, limita);
337 #else
338 if (opt & OPT_v)
339 bb_error_msg("system does not support RLIMIT_%s",
340 "VMEM");
341 #endif
342 #endif
344 if (opt & OPT_o) {
345 #ifdef RLIMIT_NOFILE
346 limit(RLIMIT_NOFILE, limito);
347 #else
348 #ifdef RLIMIT_OFILE
349 limit(RLIMIT_OFILE, limito);
350 #else
351 if (opt & OPT_v)
352 bb_error_msg("system does not support RLIMIT_%s",
353 "NOFILE");
354 #endif
355 #endif
357 if (opt & OPT_p) {
358 #ifdef RLIMIT_NPROC
359 limit(RLIMIT_NPROC, limitp);
360 #else
361 if (opt & OPT_v)
362 bb_error_msg("system does not support RLIMIT_%s",
363 "NPROC");
364 #endif
366 if (opt & OPT_f) {
367 #ifdef RLIMIT_FSIZE
368 limit(RLIMIT_FSIZE, limitf);
369 #else
370 if (opt & OPT_v)
371 bb_error_msg("system does not support RLIMIT_%s",
372 "FSIZE");
373 #endif
375 if (opt & OPT_c) {
376 #ifdef RLIMIT_CORE
377 limit(RLIMIT_CORE, limitc);
378 #else
379 if (opt & OPT_v)
380 bb_error_msg("system does not support RLIMIT_%s",
381 "CORE");
382 #endif
384 if (opt & OPT_r) {
385 #ifdef RLIMIT_RSS
386 limit(RLIMIT_RSS, limitr);
387 #else
388 if (opt & OPT_v)
389 bb_error_msg("system does not support RLIMIT_%s",
390 "RSS");
391 #endif
393 if (opt & OPT_t) {
394 #ifdef RLIMIT_CPU
395 limit(RLIMIT_CPU, limitt);
396 #else
397 if (opt & OPT_v)
398 bb_error_msg("system does not support RLIMIT_%s",
399 "CPU");
400 #endif
403 if (opt & OPT_P)
404 setsid();
406 if (opt & OPT_e)
407 edir(env_dir);
409 if (opt & (OPT_u|OPT_U))
410 xget_uidgid(&ugid, set_user);
412 // chrooted jail must have /etc/passwd if we move this after chroot.
413 // OTOH chroot fails for non-roots.
414 // Solution: cache uid/gid before chroot, apply uid/gid after.
415 if (opt & OPT_U) {
416 xsetenv("GID", utoa(ugid.gid));
417 xsetenv("UID", utoa(ugid.uid));
420 if (opt & OPT_root) {
421 xchroot(root);
424 if (opt & OPT_u) {
425 if (setgroups(1, &ugid.gid) == -1)
426 bb_perror_msg_and_die("setgroups");
427 xsetgid(ugid.gid);
428 xsetuid(ugid.uid);
431 if (opt & OPT_n) {
432 errno = 0;
433 if (nice(xatoi(nicestr)) == -1)
434 bb_perror_msg_and_die("nice");
437 if (opt & OPT_0)
438 close(STDIN_FILENO);
439 if (opt & OPT_1)
440 close(STDOUT_FILENO);
441 if (opt & OPT_2)
442 close(STDERR_FILENO);
444 BB_EXECVP_or_die(argv);