| 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 |
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| 30 | //config:config RUNSVDIR
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| 31 | //config: bool "runsvdir"
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| 32 | //config: default y
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| 33 | //config: help
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| 34 | //config: runsvdir starts a runsv process for each subdirectory, or symlink to
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| 35 | //config: a directory, in the services directory dir, up to a limit of 1000
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| 36 | //config: subdirectories, and restarts a runsv process if it terminates.
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| 37 | //config:
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| 38 | //config:config FEATURE_RUNSVDIR_LOG
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| 39 | //config: bool "Enable scrolling argument log"
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| 40 | //config: depends on RUNSVDIR
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| 41 | //config: default n
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| 42 | //config: help
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| 43 | //config: Enable feature where second parameter of runsvdir holds last error
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| 44 | //config: message (viewable via top/ps). Otherwise (feature is off
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| 45 | //config: or no parameter), error messages go to stderr only.
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| 46 |
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| 47 | //applet:IF_RUNSVDIR(APPLET(runsvdir, BB_DIR_USR_BIN, BB_SUID_DROP))
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| 48 |
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| 49 | //kbuild:lib-$(CONFIG_RUNSVDIR) += runsvdir.o
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| 50 |
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| 51 | //usage:#define runsvdir_trivial_usage
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| 52 | //usage: "[-P] [-s SCRIPT] DIR"
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| 53 | //usage:#define runsvdir_full_usage "\n\n"
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| 54 | //usage: "Start a runsv process for each subdirectory. If it exits, restart it.\n"
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| 55 | //usage: "\n -P Put each runsv in a new session"
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| 56 | //usage: "\n -s SCRIPT Run SCRIPT <signo> after signal is processed"
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| 57 |
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| 58 | #include <sys/file.h>
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| 59 | #include "libbb.h"
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| 60 | #include "common_bufsiz.h"
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| 61 | #include "runit_lib.h"
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| 62 |
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| 63 | #define MAXSERVICES 1000
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| 64 |
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| 65 | /* Should be not needed - all dirs are on same FS, right? */
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| 66 | #define CHECK_DEVNO_TOO 0
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| 67 |
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| 68 | struct service {
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| 69 | #if CHECK_DEVNO_TOO
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| 70 | dev_t dev;
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| 71 | #endif
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| 72 | ino_t ino;
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| 73 | pid_t pid;
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| 74 | smallint isgone;
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| 75 | };
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| 76 |
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| 77 | struct globals {
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| 78 | struct service *sv;
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| 79 | char *svdir;
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| 80 | int svnum;
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| 81 | #if ENABLE_FEATURE_RUNSVDIR_LOG
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| 82 | char *rplog;
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| 83 | struct fd_pair logpipe;
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| 84 | struct pollfd pfd[1];
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| 85 | unsigned stamplog;
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| 86 | #endif
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| 87 | } FIX_ALIASING;
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| 88 | #define G (*(struct globals*)bb_common_bufsiz1)
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| 89 | #define sv (G.sv )
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| 90 | #define svdir (G.svdir )
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| 91 | #define svnum (G.svnum )
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| 92 | #define rplog (G.rplog )
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| 93 | #define logpipe (G.logpipe )
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| 94 | #define pfd (G.pfd )
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| 95 | #define stamplog (G.stamplog )
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| 96 | #define INIT_G() do { setup_common_bufsiz(); } while (0)
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| 97 |
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| 98 | static void fatal2_cannot(const char *m1, const char *m2)
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| 99 | {
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| 100 | bb_perror_msg_and_die("%s: fatal: can't %s%s", svdir, m1, m2);
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| 101 | /* was exiting 100 */
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| 102 | }
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| 103 | static void warn3x(const char *m1, const char *m2, const char *m3)
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| 104 | {
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| 105 | bb_error_msg("%s: warning: %s%s%s", svdir, m1, m2, m3);
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| 106 | }
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| 107 | static void warn2_cannot(const char *m1, const char *m2)
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| 108 | {
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| 109 | warn3x("can't ", m1, m2);
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| 110 | }
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| 111 | #if ENABLE_FEATURE_RUNSVDIR_LOG
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| 112 | static void warnx(const char *m1)
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| 113 | {
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| 114 | warn3x(m1, "", "");
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| 115 | }
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| 116 | #endif
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| 117 |
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| 118 | /* inlining + vfork -> bigger code */
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| 119 | static NOINLINE pid_t runsv(const char *name)
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| 120 | {
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| 121 | pid_t pid;
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| 122 |
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| 123 | /* If we got signaled, stop spawning children at once! */
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| 124 | if (bb_got_signal)
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| 125 | return 0;
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| 126 |
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| 127 | pid = vfork();
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| 128 | if (pid == -1) {
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| 129 | warn2_cannot("vfork", "");
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| 130 | return 0;
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| 131 | }
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| 132 | if (pid == 0) {
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| 133 | /* child */
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| 134 | if (option_mask32 & 1) /* -P option? */
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| 135 | setsid();
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| 136 | /* man execv:
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| 137 | * "Signals set to be caught by the calling process image
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| 138 | * shall be set to the default action in the new process image."
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| 139 | * Therefore, we do not need this: */
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| 140 | #if 0
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| 141 | bb_signals(0
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| 142 | | (1 << SIGHUP)
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| 143 | | (1 << SIGTERM)
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| 144 | , SIG_DFL);
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| 145 | #endif
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| 146 | execlp("runsv", "runsv", name, (char *) NULL);
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| 147 | fatal2_cannot("start runsv ", name);
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| 148 | }
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| 149 | return pid;
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| 150 | }
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| 151 |
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| 152 | /* gcc 4.3.0 does better with NOINLINE */
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| 153 | static NOINLINE int do_rescan(void)
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| 154 | {
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| 155 | DIR *dir;
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| 156 | struct dirent *d;
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| 157 | int i;
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| 158 | struct stat s;
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| 159 | int need_rescan = 0;
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| 160 |
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| 161 | dir = opendir(".");
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| 162 | if (!dir) {
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| 163 | warn2_cannot("open directory ", svdir);
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| 164 | return 1; /* need to rescan again soon */
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| 165 | }
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| 166 | for (i = 0; i < svnum; i++)
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| 167 | sv[i].isgone = 1;
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| 168 |
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| 169 | while (1) {
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| 170 | errno = 0;
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| 171 | d = readdir(dir);
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| 172 | if (!d)
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| 173 | break;
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| 174 | if (d->d_name[0] == '.')
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| 175 | continue;
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| 176 | if (stat(d->d_name, &s) == -1) {
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| 177 | warn2_cannot("stat ", d->d_name);
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| 178 | continue;
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| 179 | }
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| 180 | if (!S_ISDIR(s.st_mode))
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| 181 | continue;
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| 182 | /* Do we have this service listed already? */
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| 183 | for (i = 0; i < svnum; i++) {
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| 184 | if ((sv[i].ino == s.st_ino)
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| 185 | #if CHECK_DEVNO_TOO
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| 186 | && (sv[i].dev == s.st_dev)
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| 187 | #endif
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| 188 | ) {
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| 189 | if (sv[i].pid == 0) /* restart if it has died */
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| 190 | goto run_ith_sv;
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| 191 | sv[i].isgone = 0; /* "we still see you" */
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| 192 | goto next_dentry;
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| 193 | }
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| 194 | }
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| 195 | { /* Not found, make new service */
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| 196 | struct service *svnew = realloc(sv, (i+1) * sizeof(*sv));
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| 197 | if (!svnew) {
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| 198 | warn2_cannot("start runsv ", d->d_name);
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| 199 | need_rescan = 1;
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| 200 | continue;
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| 201 | }
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| 202 | sv = svnew;
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| 203 | svnum++;
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| 204 | #if CHECK_DEVNO_TOO
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| 205 | sv[i].dev = s.st_dev;
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| 206 | #endif
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| 207 | sv[i].ino = s.st_ino;
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| 208 | run_ith_sv:
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| 209 | sv[i].pid = runsv(d->d_name);
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| 210 | sv[i].isgone = 0;
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| 211 | }
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| 212 | next_dentry: ;
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| 213 | }
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| 214 | i = errno;
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| 215 | closedir(dir);
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| 216 | if (i) { /* readdir failed */
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| 217 | warn2_cannot("read directory ", svdir);
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| 218 | return 1; /* need to rescan again soon */
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| 219 | }
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| 220 |
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| 221 | /* Send SIGTERM to runsv whose directories
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| 222 | * were no longer found (-> must have been removed) */
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| 223 | for (i = 0; i < svnum; i++) {
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| 224 | if (!sv[i].isgone)
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| 225 | continue;
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| 226 | if (sv[i].pid)
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| 227 | kill(sv[i].pid, SIGTERM);
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| 228 | svnum--;
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| 229 | sv[i] = sv[svnum];
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| 230 | i--; /* so that we don't skip new sv[i] (bug was here!) */
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| 231 | }
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| 232 | return need_rescan;
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| 233 | }
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| 234 |
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| 235 | int runsvdir_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 236 | int runsvdir_main(int argc UNUSED_PARAM, char **argv)
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| 237 | {
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| 238 | struct stat s;
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| 239 | dev_t last_dev = last_dev; /* for gcc */
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| 240 | ino_t last_ino = last_ino; /* for gcc */
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| 241 | time_t last_mtime;
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| 242 | int curdir;
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| 243 | unsigned stampcheck;
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| 244 | int i;
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| 245 | int need_rescan;
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| 246 | bool i_am_init;
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| 247 | char *opt_s_argv[3];
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| 248 |
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| 249 | INIT_G();
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| 250 |
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| 251 | opt_complementary = "-1";
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| 252 | opt_s_argv[0] = NULL;
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| 253 | opt_s_argv[2] = NULL;
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| 254 | getopt32(argv, "Ps:", &opt_s_argv[0]);
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| 255 | argv += optind;
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| 256 |
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| 257 | i_am_init = (getpid() == 1);
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| 258 | bb_signals(0
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| 259 | | (1 << SIGTERM)
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| 260 | | (1 << SIGHUP)
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| 261 | /* For busybox's init, SIGTERM == reboot,
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| 262 | * SIGUSR1 == halt,
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| 263 | * SIGUSR2 == poweroff,
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| 264 | * Ctlr-ALt-Del sends SIGINT to init,
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| 265 | * so we need to intercept SIGUSRn and SIGINT too.
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| 266 | * Note that we do not implement actual reboot
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| 267 | * (killall(TERM) + umount, etc), we just pause
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| 268 | * respawing and avoid exiting (-> making kernel oops).
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| 269 | * The user is responsible for the rest.
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| 270 | */
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| 271 | | (i_am_init ? ((1 << SIGUSR1) | (1 << SIGUSR2) | (1 << SIGINT)) : 0)
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| 272 | , record_signo);
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| 273 | svdir = *argv++;
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| 274 |
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| 275 | #if ENABLE_FEATURE_RUNSVDIR_LOG
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| 276 | /* setup log */
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| 277 | if (*argv) {
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| 278 | rplog = *argv;
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| 279 | if (strlen(rplog) < 7) {
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| 280 | warnx("log must have at least seven characters");
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| 281 | } else if (piped_pair(logpipe)) {
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| 282 | warnx("can't create pipe for log");
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| 283 | } else {
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| 284 | close_on_exec_on(logpipe.rd);
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| 285 | close_on_exec_on(logpipe.wr);
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| 286 | ndelay_on(logpipe.rd);
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| 287 | ndelay_on(logpipe.wr);
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| 288 | if (dup2(logpipe.wr, 2) == -1) {
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| 289 | warnx("can't set filedescriptor for log");
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| 290 | } else {
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| 291 | pfd[0].fd = logpipe.rd;
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| 292 | pfd[0].events = POLLIN;
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| 293 | stamplog = monotonic_sec();
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| 294 | goto run;
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| 295 | }
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| 296 | }
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| 297 | rplog = NULL;
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| 298 | warnx("log service disabled");
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| 299 | }
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| 300 | run:
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| 301 | #endif
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| 302 | curdir = open(".", O_RDONLY|O_NDELAY);
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| 303 | if (curdir == -1)
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| 304 | fatal2_cannot("open current directory", "");
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| 305 | close_on_exec_on(curdir);
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| 306 |
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| 307 | stampcheck = monotonic_sec();
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| 308 | need_rescan = 1;
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| 309 | last_mtime = 0;
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| 310 |
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| 311 | for (;;) {
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| 312 | unsigned now;
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| 313 | unsigned sig;
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| 314 |
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| 315 | /* collect children */
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| 316 | for (;;) {
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| 317 | pid_t pid = wait_any_nohang(NULL);
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| 318 | if (pid <= 0)
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| 319 | break;
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| 320 | for (i = 0; i < svnum; i++) {
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| 321 | if (pid == sv[i].pid) {
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| 322 | /* runsv has died */
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| 323 | sv[i].pid = 0;
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| 324 | need_rescan = 1;
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| 325 | }
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| 326 | }
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| 327 | }
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| 328 |
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| 329 | now = monotonic_sec();
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| 330 | if ((int)(now - stampcheck) >= 0) {
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| 331 | /* wait at least a second */
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| 332 | stampcheck = now + 1;
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| 333 |
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| 334 | if (stat(svdir, &s) != -1) {
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| 335 | if (need_rescan || s.st_mtime != last_mtime
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| 336 | || s.st_ino != last_ino || s.st_dev != last_dev
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| 337 | ) {
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| 338 | /* svdir modified */
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| 339 | if (chdir(svdir) != -1) {
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| 340 | last_mtime = s.st_mtime;
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| 341 | last_dev = s.st_dev;
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| 342 | last_ino = s.st_ino;
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| 343 | /* if the svdir changed this very second, wait until the
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| 344 | * next second, because we won't be able to detect more
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| 345 | * changes within this second */
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| 346 | while (time(NULL) == last_mtime)
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| 347 | usleep(100000);
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| 348 | need_rescan = do_rescan();
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| 349 | while (fchdir(curdir) == -1) {
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| 350 | warn2_cannot("change directory, pausing", "");
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| 351 | sleep(5);
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| 352 | }
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| 353 | } else {
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| 354 | warn2_cannot("change directory to ", svdir);
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| 355 | }
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| 356 | }
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| 357 | } else {
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| 358 | warn2_cannot("stat ", svdir);
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| 359 | }
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| 360 | }
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| 361 |
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| 362 | #if ENABLE_FEATURE_RUNSVDIR_LOG
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| 363 | if (rplog) {
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| 364 | if ((int)(now - stamplog) >= 0) {
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| 365 | write(logpipe.wr, ".", 1);
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| 366 | stamplog = now + 900;
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| 367 | }
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| 368 | }
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| 369 | pfd[0].revents = 0;
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| 370 | #endif
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| 371 | {
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| 372 | unsigned deadline = (need_rescan ? 1 : 5);
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| 373 | #if ENABLE_FEATURE_RUNSVDIR_LOG
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| 374 | if (rplog)
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| 375 | poll(pfd, 1, deadline*1000);
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| 376 | else
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| 377 | #endif
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| 378 | sleep(deadline);
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| 379 | }
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| 380 |
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| 381 | #if ENABLE_FEATURE_RUNSVDIR_LOG
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| 382 | if (pfd[0].revents & POLLIN) {
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| 383 | char ch;
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| 384 | while (read(logpipe.rd, &ch, 1) > 0) {
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| 385 | if (ch < ' ')
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| 386 | ch = ' ';
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| 387 | for (i = 6; rplog[i] != '\0'; i++)
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| 388 | rplog[i-1] = rplog[i];
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| 389 | rplog[i-1] = ch;
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| 390 | }
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| 391 | }
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| 392 | #endif
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| 393 | sig = bb_got_signal;
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| 394 | if (!sig)
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| 395 | continue;
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| 396 | bb_got_signal = 0;
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| 397 |
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| 398 | /* -s SCRIPT: useful if we are init.
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| 399 | * In this case typically script never returns,
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| 400 | * it halts/powers off/reboots the system. */
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| 401 | if (opt_s_argv[0]) {
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| 402 | pid_t pid;
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| 403 |
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| 404 | /* Single parameter: signal# */
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| 405 | opt_s_argv[1] = utoa(sig);
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| 406 | pid = spawn(opt_s_argv);
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| 407 | if (pid > 0) {
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| 408 | /* Remembering to wait for _any_ children,
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| 409 | * not just pid */
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| 410 | while (wait(NULL) != pid)
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| 411 | continue;
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| 412 | }
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| 413 | }
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| 414 |
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| 415 | if (sig == SIGHUP) {
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| 416 | for (i = 0; i < svnum; i++)
|
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| 417 | if (sv[i].pid)
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| 418 | kill(sv[i].pid, SIGTERM);
|
|---|
| 419 | }
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| 420 | /* SIGHUP or SIGTERM (or SIGUSRn if we are init) */
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|---|
| 421 | /* Exit unless we are init */
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|---|
| 422 | if (!i_am_init)
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| 423 | return (SIGHUP == sig) ? 111 : EXIT_SUCCESS;
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| 424 |
|
|---|
| 425 | /* init continues to monitor services forever */
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|---|
| 426 | } /* for (;;) */
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|---|
| 427 | }
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|---|
