2 Copyright (c) 2001-2006, Gerrit Pape
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.
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11 notice, this list of conditions and the following disclaimer in the
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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
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21 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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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"
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"
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"
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"
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"
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"
94 #include <sys/resource.h> /* getrlimit */
97 Five applets here: chpst, envdir, envuidgid, setuidgid, softlimit.
99 Only softlimit and chpst are taking options:
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
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
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
119 -n NICE Add NICE to nice value
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.
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)
165 wdir = xopen(".", O_RDONLY | O_NDELAY);
166 xchdir(directory_name);
177 bb_perror_msg_and_die("readdir %s",
181 if (d->d_name[0] == '.')
183 fd = open(d->d_name, O_RDONLY | O_NDELAY);
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);
191 bb_perror_msg_and_die("open %s/%s",
192 directory_name, d->d_name);
194 size = full_read(fd, buf, sizeof(buf)-1);
197 bb_perror_msg_and_die("read %s/%s",
198 directory_name, d->d_name);
204 tail = strchr(buf, '\n');
205 /* skip trailing whitespace */
209 if (tail < buf || !isspace(*tail))
212 xsetenv(d->d_name, buf);
215 if (fchdir(wdir) == -1)
216 bb_perror_msg_and_die("fchdir");
220 static void limit(int what, long l)
224 /* Never fails under Linux (except if you pass it bad arguments) */
226 if ((l < 0) || (l > r.rlim_max))
227 r.rlim_cur = r.rlim_max;
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_dir = env_dir;
255 if ((ENABLE_CHPST && applet_name[0] == 'c')
256 || (ENABLE_SOFTLIMIT && applet_name[1] == 'o')
258 // FIXME: can we live with int-sized limits?
259 // can we live with 40000 days?
260 // if yes -> getopt converts strings to numbers for us
261 opt_complementary = "-1:a+:c+:d+:f+:l+:m+:o+:p+:r+:s+:t+";
262 opt = getopt32(argv, "+a:c:d:f:l:m:o:p:r:s:t:u:U:e:"
263 IF_CHPST("/:n:vP012"),
264 &limita, &limitc, &limitd, &limitf, &limitl,
265 &limitm, &limito, &limitp, &limitr, &limits, &limitt,
266 &set_user, &set_user, &env_dir
267 IF_CHPST(, &root, &nicestr));
269 if (opt & OPT_m) { // -m means -asld
270 limita = limits = limitl = limitd = limitm;
271 opt |= (OPT_s | OPT_l | OPT_a | OPT_d);
274 option_mask32 = opt = 0;
281 if (ENABLE_ENVDIR && applet_name[3] == 'd') {
287 if (ENABLE_SETUIDGID && applet_name[1] == 'e') {
293 if (ENABLE_ENVUIDGID && applet_name[0] == 'e' && applet_name[3] == 'u') {
298 // we must have PROG [ARGS]
305 limit(RLIMIT_DATA, limitd);
308 bb_error_msg("system does not support RLIMIT_%s",
314 limit(RLIMIT_STACK, limits);
317 bb_error_msg("system does not support RLIMIT_%s",
322 #ifdef RLIMIT_MEMLOCK
323 limit(RLIMIT_MEMLOCK, limitl);
326 bb_error_msg("system does not support RLIMIT_%s",
332 limit(RLIMIT_VMEM, limita);
335 limit(RLIMIT_AS, limita);
338 bb_error_msg("system does not support RLIMIT_%s",
345 limit(RLIMIT_NOFILE, limito);
348 limit(RLIMIT_OFILE, limito);
351 bb_error_msg("system does not support RLIMIT_%s",
358 limit(RLIMIT_NPROC, limitp);
361 bb_error_msg("system does not support RLIMIT_%s",
367 limit(RLIMIT_FSIZE, limitf);
370 bb_error_msg("system does not support RLIMIT_%s",
376 limit(RLIMIT_CORE, limitc);
379 bb_error_msg("system does not support RLIMIT_%s",
385 limit(RLIMIT_RSS, limitr);
388 bb_error_msg("system does not support RLIMIT_%s",
394 limit(RLIMIT_CPU, limitt);
397 bb_error_msg("system does not support RLIMIT_%s",
408 if (opt & (OPT_u|OPT_U))
409 xget_uidgid(&ugid, set_user);
411 // chrooted jail must have /etc/passwd if we move this after chroot.
412 // OTOH chroot fails for non-roots.
413 // Solution: cache uid/gid before chroot, apply uid/gid after.
415 xsetenv("GID", utoa(ugid.gid));
416 xsetenv("UID", utoa(ugid.uid));
419 if (opt & OPT_root) {
424 if (setgroups(1, &ugid.gid) == -1)
425 bb_perror_msg_and_die("setgroups");
432 if (nice(xatoi(nicestr)) == -1)
433 bb_perror_msg_and_die("nice");
439 close(STDOUT_FILENO);
441 close(STDERR_FILENO);
443 BB_EXECVP_or_die(argv);