mirror of
https://github.com/sheumann/hush.git
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362 lines
7.8 KiB
C
362 lines
7.8 KiB
C
/*
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Copyright (c) 2001-2006, Gerrit Pape
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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3. The name of the author may not be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/* Busyboxed by Denys Vlasenko <vda.linux@googlemail.com> */
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/* TODO: depends on runit_lib.c - review and reduce/eliminate */
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#include <sys/poll.h>
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#include <sys/file.h>
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#include "libbb.h"
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#include "runit_lib.h"
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#define MAXSERVICES 1000
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struct service {
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dev_t dev;
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ino_t ino;
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pid_t pid;
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smallint isgone;
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};
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struct globals {
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struct service *sv;
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char *svdir;
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char *rplog;
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int svnum;
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int rploglen;
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struct fd_pair logpipe;
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struct pollfd pfd[1];
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unsigned stamplog;
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smallint check; /* = 1; */
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smallint exitsoon;
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smallint set_pgrp;
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};
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#define G (*(struct globals*)&bb_common_bufsiz1)
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#define sv (G.sv )
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#define svdir (G.svdir )
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#define rplog (G.rplog )
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#define svnum (G.svnum )
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#define rploglen (G.rploglen )
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#define logpipe (G.logpipe )
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#define pfd (G.pfd )
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#define stamplog (G.stamplog )
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#define check (G.check )
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#define exitsoon (G.exitsoon )
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#define set_pgrp (G.set_pgrp )
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#define INIT_G() do { \
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check = 1; \
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} while (0)
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static void fatal2_cannot(const char *m1, const char *m2)
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{
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bb_perror_msg_and_die("%s: fatal: cannot %s%s", svdir, m1, m2);
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/* was exiting 100 */
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}
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static void warn3x(const char *m1, const char *m2, const char *m3)
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{
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bb_error_msg("%s: warning: %s%s%s", svdir, m1, m2, m3);
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}
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static void warn2_cannot(const char *m1, const char *m2)
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{
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warn3x("cannot ", m1, m2);
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}
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static void warnx(const char *m1)
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{
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warn3x(m1, "", "");
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}
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static void s_term(int sig_no ATTRIBUTE_UNUSED)
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{
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exitsoon = 1;
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}
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static void s_hangup(int sig_no ATTRIBUTE_UNUSED)
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{
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exitsoon = 2;
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}
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static void runsv(int no, const char *name)
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{
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pid_t pid;
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char *prog[3];
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prog[0] = (char*)"runsv";
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prog[1] = (char*)name;
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prog[2] = NULL;
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pid = vfork();
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if (pid == -1) {
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warn2_cannot("vfork", "");
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return;
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}
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if (pid == 0) {
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/* child */
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if (set_pgrp)
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setsid();
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bb_signals(0
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+ (1 << SIGHUP)
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+ (1 << SIGTERM)
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, SIG_DFL);
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execvp(prog[0], prog);
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fatal2_cannot("start runsv ", name);
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}
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sv[no].pid = pid;
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}
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static void runsvdir(void)
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{
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DIR *dir;
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direntry *d;
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int i;
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struct stat s;
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dir = opendir(".");
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if (!dir) {
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warn2_cannot("open directory ", svdir);
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return;
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}
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for (i = 0; i < svnum; i++)
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sv[i].isgone = 1;
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while (1) {
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errno = 0;
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d = readdir(dir);
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if (!d)
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break;
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if (d->d_name[0] == '.')
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continue;
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if (stat(d->d_name, &s) == -1) {
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warn2_cannot("stat ", d->d_name);
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errno = 0;
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continue;
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}
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if (!S_ISDIR(s.st_mode))
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continue;
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for (i = 0; i < svnum; i++) {
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if ((sv[i].ino == s.st_ino) && (sv[i].dev == s.st_dev)) {
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sv[i].isgone = 0;
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if (!sv[i].pid)
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runsv(i, d->d_name);
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break;
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}
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}
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if (i == svnum) {
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/* new service */
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struct service *svnew = realloc(sv, (i+1) * sizeof(*sv));
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if (!svnew) {
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warn3x("cannot start runsv ", d->d_name,
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" too many services");
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continue;
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}
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sv = svnew;
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svnum++;
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memset(&sv[i], 0, sizeof(sv[i]));
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sv[i].ino = s.st_ino;
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sv[i].dev = s.st_dev;
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/*sv[i].pid = 0;*/
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/*sv[i].isgone = 0;*/
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runsv(i, d->d_name);
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check = 1;
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}
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}
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if (errno) {
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warn2_cannot("read directory ", svdir);
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closedir(dir);
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check = 1;
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return;
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}
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closedir(dir);
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/* SIGTERM removed runsv's */
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for (i = 0; i < svnum; i++) {
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if (!sv[i].isgone)
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continue;
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if (sv[i].pid)
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kill(sv[i].pid, SIGTERM);
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sv[i] = sv[--svnum];
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/* BUG? we deleted sv[i] by copying over sv[last], but we will not check this newly-copied one! */
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check = 1;
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}
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}
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static int setup_log(void)
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{
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rploglen = strlen(rplog);
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if (rploglen < 7) {
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warnx("log must have at least seven characters");
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return 0;
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}
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if (piped_pair(logpipe)) {
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warnx("cannot create pipe for log");
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return -1;
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}
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close_on_exec_on(logpipe.rd);
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close_on_exec_on(logpipe.wr);
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ndelay_on(logpipe.rd);
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ndelay_on(logpipe.wr);
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if (dup2(logpipe.wr, 2) == -1) {
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warnx("cannot set filedescriptor for log");
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return -1;
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}
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pfd[0].fd = logpipe.rd;
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pfd[0].events = POLLIN;
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stamplog = monotonic_sec();
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return 1;
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}
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int runsvdir_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int runsvdir_main(int argc ATTRIBUTE_UNUSED, char **argv)
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{
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struct stat s;
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dev_t last_dev = last_dev; /* for gcc */
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ino_t last_ino = last_ino; /* for gcc */
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time_t last_mtime = 0;
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int wstat;
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int curdir;
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int pid;
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unsigned deadline;
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unsigned now;
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unsigned stampcheck;
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char ch;
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int i;
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INIT_G();
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argv++;
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if (!*argv)
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bb_show_usage();
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if (argv[0][0] == '-') {
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switch (argv[0][1]) {
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case 'P': set_pgrp = 1;
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case '-': ++argv;
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}
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if (!*argv)
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bb_show_usage();
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}
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bb_signals_recursive(1 << SIGTERM, s_term);
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bb_signals_recursive(1 << SIGHUP, s_hangup);
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svdir = *argv++;
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if (argv && *argv) {
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rplog = *argv;
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if (setup_log() != 1) {
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rplog = 0;
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warnx("log service disabled");
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}
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}
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curdir = open_read(".");
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if (curdir == -1)
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fatal2_cannot("open current directory", "");
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close_on_exec_on(curdir);
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stampcheck = monotonic_sec();
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for (;;) {
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/* collect children */
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for (;;) {
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pid = wait_any_nohang(&wstat);
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if (pid <= 0)
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break;
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for (i = 0; i < svnum; i++) {
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if (pid == sv[i].pid) {
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/* runsv has gone */
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sv[i].pid = 0;
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check = 1;
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break;
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}
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}
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}
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now = monotonic_sec();
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if ((int)(now - stampcheck) >= 0) {
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/* wait at least a second */
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stampcheck = now + 1;
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if (stat(svdir, &s) != -1) {
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if (check || s.st_mtime != last_mtime
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|| s.st_ino != last_ino || s.st_dev != last_dev
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) {
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/* svdir modified */
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if (chdir(svdir) != -1) {
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last_mtime = s.st_mtime;
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last_dev = s.st_dev;
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last_ino = s.st_ino;
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check = 0;
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//if (now <= mtime)
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// sleep(1);
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runsvdir();
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while (fchdir(curdir) == -1) {
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warn2_cannot("change directory, pausing", "");
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sleep(5);
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}
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} else
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warn2_cannot("change directory to ", svdir);
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}
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} else
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warn2_cannot("stat ", svdir);
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}
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if (rplog) {
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if ((int)(now - stamplog) >= 0) {
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write(logpipe.wr, ".", 1);
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stamplog = now + 900;
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}
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}
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pfd[0].revents = 0;
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sig_block(SIGCHLD);
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deadline = (check ? 1 : 5);
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if (rplog)
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poll(pfd, 1, deadline*1000);
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else
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sleep(deadline);
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sig_unblock(SIGCHLD);
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if (pfd[0].revents & POLLIN) {
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while (read(logpipe.rd, &ch, 1) > 0) {
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if (ch) {
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for (i = 6; i < rploglen; i++)
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rplog[i-1] = rplog[i];
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rplog[rploglen-1] = ch;
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}
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}
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}
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switch (exitsoon) {
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case 1:
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_exit(EXIT_SUCCESS);
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case 2:
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for (i = 0; i < svnum; i++)
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if (sv[i].pid)
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kill(sv[i].pid, SIGTERM);
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_exit(111);
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}
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}
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/* not reached */
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return 0;
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}
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