| 1 | /*
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| 2 | Copyright (c) 2001-2006, Gerrit Pape
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| 3 | All rights reserved.
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| 4 |
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| 5 | Redistribution and use in source and binary forms, with or without
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| 6 | modification, are permitted provided that the following conditions are met:
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| 7 |
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| 8 | 1. Redistributions of source code must retain the above copyright notice,
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| 9 | this list of conditions and the following disclaimer.
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| 10 | 2. Redistributions in binary form must reproduce the above copyright
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| 11 | notice, this list of conditions and the following disclaimer in the
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| 12 | documentation and/or other materials provided with the distribution.
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| 13 | 3. The name of the author may not be used to endorse or promote products
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| 14 | derived from this software without specific prior written permission.
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| 15 |
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| 16 | THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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| 17 | WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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| 18 | MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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| 19 | EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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| 20 | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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| 21 | PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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| 22 | OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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| 23 | WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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| 24 | OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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| 25 | ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 26 | */
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| 27 |
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| 28 | /* Busyboxed by Denys Vlasenko <vda.linux@googlemail.com> */
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| 29 | /* TODO: depends on runit_lib.c - review and reduce/eliminate */
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| 30 |
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| 31 | #include <sys/poll.h>
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| 32 | #include <sys/file.h>
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| 33 | #include "libbb.h"
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| 34 | #include "runit_lib.h"
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| 35 |
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| 36 | #define MAXSERVICES 1000
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| 37 |
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| 38 | /* Should be not needed - all dirs are on same FS, right? */
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| 39 | #define CHECK_DEVNO_TOO 0
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| 40 |
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| 41 | struct service {
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| 42 | #if CHECK_DEVNO_TOO
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| 43 | dev_t dev;
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| 44 | #endif
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| 45 | ino_t ino;
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| 46 | pid_t pid;
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| 47 | smallint isgone;
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| 48 | };
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| 49 |
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| 50 | struct globals {
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| 51 | struct service *sv;
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| 52 | char *svdir;
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| 53 | int svnum;
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| 54 | #if ENABLE_FEATURE_RUNSVDIR_LOG
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| 55 | char *rplog;
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| 56 | int rploglen;
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| 57 | struct fd_pair logpipe;
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| 58 | struct pollfd pfd[1];
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| 59 | unsigned stamplog;
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| 60 | #endif
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| 61 | } FIX_ALIASING;
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| 62 | #define G (*(struct globals*)&bb_common_bufsiz1)
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| 63 | #define sv (G.sv )
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| 64 | #define svdir (G.svdir )
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| 65 | #define svnum (G.svnum )
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| 66 | #define rplog (G.rplog )
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| 67 | #define rploglen (G.rploglen )
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| 68 | #define logpipe (G.logpipe )
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| 69 | #define pfd (G.pfd )
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| 70 | #define stamplog (G.stamplog )
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| 71 | #define INIT_G() do { \
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| 72 | } while (0)
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| 73 |
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| 74 | static void fatal2_cannot(const char *m1, const char *m2)
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| 75 | {
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| 76 | bb_perror_msg_and_die("%s: fatal: can't %s%s", svdir, m1, m2);
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| 77 | /* was exiting 100 */
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| 78 | }
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| 79 | static void warn3x(const char *m1, const char *m2, const char *m3)
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| 80 | {
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| 81 | bb_error_msg("%s: warning: %s%s%s", svdir, m1, m2, m3);
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| 82 | }
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| 83 | static void warn2_cannot(const char *m1, const char *m2)
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| 84 | {
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| 85 | warn3x("can't ", m1, m2);
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| 86 | }
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| 87 | #if ENABLE_FEATURE_RUNSVDIR_LOG
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| 88 | static void warnx(const char *m1)
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| 89 | {
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| 90 | warn3x(m1, "", "");
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| 91 | }
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| 92 | #endif
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| 93 |
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| 94 | /* inlining + vfork -> bigger code */
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| 95 | static NOINLINE pid_t runsv(const char *name)
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| 96 | {
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| 97 | pid_t pid;
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| 98 |
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| 99 | /* If we got signaled, stop spawning children at once! */
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| 100 | if (bb_got_signal)
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| 101 | return 0;
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| 102 |
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| 103 | pid = vfork();
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| 104 | if (pid == -1) {
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| 105 | warn2_cannot("vfork", "");
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| 106 | return 0;
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| 107 | }
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| 108 | if (pid == 0) {
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| 109 | /* child */
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| 110 | if (option_mask32 & 1) /* -P option? */
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| 111 | setsid();
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| 112 | /* man execv:
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| 113 | * "Signals set to be caught by the calling process image
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| 114 | * shall be set to the default action in the new process image."
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| 115 | * Therefore, we do not need this: */
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| 116 | #if 0
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| 117 | bb_signals(0
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| 118 | | (1 << SIGHUP)
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| 119 | | (1 << SIGTERM)
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| 120 | , SIG_DFL);
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| 121 | #endif
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| 122 | execlp("runsv", "runsv", name, (char *) NULL);
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| 123 | fatal2_cannot("start runsv ", name);
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| 124 | }
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| 125 | return pid;
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| 126 | }
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| 127 |
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| 128 | /* gcc 4.3.0 does better with NOINLINE */
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| 129 | static NOINLINE int do_rescan(void)
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| 130 | {
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| 131 | DIR *dir;
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| 132 | struct dirent *d;
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| 133 | int i;
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| 134 | struct stat s;
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| 135 | int need_rescan = 0;
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| 136 |
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| 137 | dir = opendir(".");
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| 138 | if (!dir) {
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| 139 | warn2_cannot("open directory ", svdir);
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| 140 | return 1; /* need to rescan again soon */
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| 141 | }
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| 142 | for (i = 0; i < svnum; i++)
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| 143 | sv[i].isgone = 1;
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| 144 |
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| 145 | while (1) {
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| 146 | errno = 0;
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| 147 | d = readdir(dir);
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| 148 | if (!d)
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| 149 | break;
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| 150 | if (d->d_name[0] == '.')
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| 151 | continue;
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| 152 | if (stat(d->d_name, &s) == -1) {
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| 153 | warn2_cannot("stat ", d->d_name);
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| 154 | continue;
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| 155 | }
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| 156 | if (!S_ISDIR(s.st_mode))
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| 157 | continue;
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| 158 | /* Do we have this service listed already? */
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| 159 | for (i = 0; i < svnum; i++) {
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| 160 | if ((sv[i].ino == s.st_ino)
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| 161 | #if CHECK_DEVNO_TOO
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| 162 | && (sv[i].dev == s.st_dev)
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| 163 | #endif
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| 164 | ) {
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| 165 | if (sv[i].pid == 0) /* restart if it has died */
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| 166 | goto run_ith_sv;
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| 167 | sv[i].isgone = 0; /* "we still see you" */
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| 168 | goto next_dentry;
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| 169 | }
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| 170 | }
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| 171 | { /* Not found, make new service */
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| 172 | struct service *svnew = realloc(sv, (i+1) * sizeof(*sv));
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| 173 | if (!svnew) {
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| 174 | warn2_cannot("start runsv ", d->d_name);
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| 175 | need_rescan = 1;
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| 176 | continue;
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| 177 | }
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| 178 | sv = svnew;
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| 179 | svnum++;
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| 180 | #if CHECK_DEVNO_TOO
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| 181 | sv[i].dev = s.st_dev;
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| 182 | #endif
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| 183 | sv[i].ino = s.st_ino;
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| 184 | run_ith_sv:
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| 185 | sv[i].pid = runsv(d->d_name);
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| 186 | sv[i].isgone = 0;
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| 187 | }
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| 188 | next_dentry: ;
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| 189 | }
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| 190 | i = errno;
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| 191 | closedir(dir);
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| 192 | if (i) { /* readdir failed */
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| 193 | warn2_cannot("read directory ", svdir);
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| 194 | return 1; /* need to rescan again soon */
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| 195 | }
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| 196 |
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| 197 | /* Send SIGTERM to runsv whose directories
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| 198 | * were no longer found (-> must have been removed) */
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| 199 | for (i = 0; i < svnum; i++) {
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| 200 | if (!sv[i].isgone)
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| 201 | continue;
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| 202 | if (sv[i].pid)
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| 203 | kill(sv[i].pid, SIGTERM);
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| 204 | svnum--;
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| 205 | sv[i] = sv[svnum];
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| 206 | i--; /* so that we don't skip new sv[i] (bug was here!) */
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| 207 | }
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| 208 | return need_rescan;
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| 209 | }
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| 210 |
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| 211 | int runsvdir_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 212 | int runsvdir_main(int argc UNUSED_PARAM, char **argv)
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| 213 | {
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| 214 | struct stat s;
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| 215 | dev_t last_dev = last_dev; /* for gcc */
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| 216 | ino_t last_ino = last_ino; /* for gcc */
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| 217 | time_t last_mtime = 0;
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| 218 | int wstat;
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| 219 | int curdir;
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| 220 | pid_t pid;
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| 221 | unsigned deadline;
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| 222 | unsigned now;
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| 223 | unsigned stampcheck;
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| 224 | int i;
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| 225 | int need_rescan = 1;
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| 226 | char *opt_s_argv[3];
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| 227 |
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| 228 | INIT_G();
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| 229 |
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| 230 | opt_complementary = "-1";
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| 231 | opt_s_argv[0] = NULL;
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| 232 | opt_s_argv[2] = NULL;
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| 233 | getopt32(argv, "Ps:", &opt_s_argv[0]);
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| 234 | argv += optind;
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| 235 |
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| 236 | bb_signals(0
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| 237 | | (1 << SIGTERM)
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| 238 | | (1 << SIGHUP)
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| 239 | /* For busybox's init, SIGTERM == reboot,
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| 240 | * SIGUSR1 == halt
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| 241 | * SIGUSR2 == poweroff
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| 242 | * so we need to intercept SIGUSRn too.
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| 243 | * Note that we do not implement actual reboot
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| 244 | * (killall(TERM) + umount, etc), we just pause
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| 245 | * respawing and avoid exiting (-> making kernel oops).
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| 246 | * The user is responsible for the rest. */
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| 247 | | (getpid() == 1 ? ((1 << SIGUSR1) | (1 << SIGUSR2)) : 0)
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| 248 | , record_signo);
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| 249 | svdir = *argv++;
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| 250 |
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| 251 | #if ENABLE_FEATURE_RUNSVDIR_LOG
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| 252 | /* setup log */
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| 253 | if (*argv) {
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| 254 | rplog = *argv;
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| 255 | rploglen = strlen(rplog);
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| 256 | if (rploglen < 7) {
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| 257 | warnx("log must have at least seven characters");
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| 258 | } else if (piped_pair(logpipe)) {
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| 259 | warnx("can't create pipe for log");
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| 260 | } else {
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| 261 | close_on_exec_on(logpipe.rd);
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| 262 | close_on_exec_on(logpipe.wr);
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| 263 | ndelay_on(logpipe.rd);
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| 264 | ndelay_on(logpipe.wr);
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| 265 | if (dup2(logpipe.wr, 2) == -1) {
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| 266 | warnx("can't set filedescriptor for log");
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| 267 | } else {
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| 268 | pfd[0].fd = logpipe.rd;
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| 269 | pfd[0].events = POLLIN;
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| 270 | stamplog = monotonic_sec();
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| 271 | goto run;
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| 272 | }
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| 273 | }
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| 274 | rplog = NULL;
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| 275 | warnx("log service disabled");
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| 276 | }
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| 277 | run:
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| 278 | #endif
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| 279 | curdir = open(".", O_RDONLY|O_NDELAY);
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| 280 | if (curdir == -1)
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| 281 | fatal2_cannot("open current directory", "");
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| 282 | close_on_exec_on(curdir);
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| 283 |
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| 284 | stampcheck = monotonic_sec();
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| 285 |
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| 286 | for (;;) {
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| 287 | /* collect children */
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| 288 | for (;;) {
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| 289 | pid = wait_any_nohang(&wstat);
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| 290 | if (pid <= 0)
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| 291 | break;
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| 292 | for (i = 0; i < svnum; i++) {
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| 293 | if (pid == sv[i].pid) {
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| 294 | /* runsv has died */
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| 295 | sv[i].pid = 0;
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| 296 | need_rescan = 1;
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| 297 | }
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| 298 | }
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| 299 | }
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| 300 |
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| 301 | now = monotonic_sec();
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| 302 | if ((int)(now - stampcheck) >= 0) {
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| 303 | /* wait at least a second */
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| 304 | stampcheck = now + 1;
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| 305 |
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| 306 | if (stat(svdir, &s) != -1) {
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| 307 | if (need_rescan || s.st_mtime != last_mtime
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| 308 | || s.st_ino != last_ino || s.st_dev != last_dev
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| 309 | ) {
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| 310 | /* svdir modified */
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| 311 | if (chdir(svdir) != -1) {
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| 312 | last_mtime = s.st_mtime;
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| 313 | last_dev = s.st_dev;
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| 314 | last_ino = s.st_ino;
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| 315 | /* if the svdir changed this very second, wait until the
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| 316 | * next second, because we won't be able to detect more
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| 317 | * changes within this second */
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| 318 | while (time(NULL) == last_mtime)
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| 319 | usleep(100000);
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| 320 | need_rescan = do_rescan();
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| 321 | while (fchdir(curdir) == -1) {
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| 322 | warn2_cannot("change directory, pausing", "");
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| 323 | sleep(5);
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| 324 | }
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| 325 | } else {
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| 326 | warn2_cannot("change directory to ", svdir);
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| 327 | }
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| 328 | }
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| 329 | } else {
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| 330 | warn2_cannot("stat ", svdir);
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| 331 | }
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| 332 | }
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| 333 |
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| 334 | #if ENABLE_FEATURE_RUNSVDIR_LOG
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| 335 | if (rplog) {
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| 336 | if ((int)(now - stamplog) >= 0) {
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| 337 | write(logpipe.wr, ".", 1);
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| 338 | stamplog = now + 900;
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| 339 | }
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| 340 | }
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| 341 | pfd[0].revents = 0;
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| 342 | #endif
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| 343 | deadline = (need_rescan ? 1 : 5);
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| 344 | sig_block(SIGCHLD);
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| 345 | #if ENABLE_FEATURE_RUNSVDIR_LOG
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| 346 | if (rplog)
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| 347 | poll(pfd, 1, deadline*1000);
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| 348 | else
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| 349 | #endif
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| 350 | sleep(deadline);
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| 351 | sig_unblock(SIGCHLD);
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| 352 |
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| 353 | #if ENABLE_FEATURE_RUNSVDIR_LOG
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| 354 | if (pfd[0].revents & POLLIN) {
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| 355 | char ch;
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| 356 | while (read(logpipe.rd, &ch, 1) > 0) {
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| 357 | if (ch < ' ')
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| 358 | ch = ' ';
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| 359 | for (i = 6; i < rploglen; i++)
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| 360 | rplog[i-1] = rplog[i];
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| 361 | rplog[rploglen-1] = ch;
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| 362 | }
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| 363 | }
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| 364 | #endif
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| 365 | if (!bb_got_signal)
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| 366 | continue;
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| 367 |
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| 368 | /* -s SCRIPT: useful if we are init.
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| 369 | * In this case typically script never returns,
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| 370 | * it halts/powers off/reboots the system. */
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| 371 | if (opt_s_argv[0]) {
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| 372 | /* Single parameter: signal# */
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| 373 | opt_s_argv[1] = utoa(bb_got_signal);
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| 374 | pid = spawn(opt_s_argv);
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| 375 | if (pid > 0) {
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| 376 | /* Remembering to wait for _any_ children,
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| 377 | * not just pid */
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| 378 | while (wait(NULL) != pid)
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| 379 | continue;
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| 380 | }
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| 381 | }
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| 382 |
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| 383 | if (bb_got_signal == SIGHUP) {
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| 384 | for (i = 0; i < svnum; i++)
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| 385 | if (sv[i].pid)
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| 386 | kill(sv[i].pid, SIGTERM);
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| 387 | }
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| 388 | /* SIGHUP or SIGTERM (or SIGUSRn if we are init) */
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| 389 | /* Exit unless we are init */
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| 390 | if (getpid() != 1)
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| 391 | return (SIGHUP == bb_got_signal) ? 111 : EXIT_SUCCESS;
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| 392 |
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| 393 | /* init continues to monitor services forever */
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| 394 | bb_got_signal = 0;
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| 395 | } /* for (;;) */
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| 396 | }
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