123 lines
3.1 KiB
C
123 lines
3.1 KiB
C
/* Copyright (C) 2020 C. McEnroe <june@causal.agency>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sysexits.h>
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#include <unistd.h>
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#include "daemon.h"
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#ifndef RUNDIR
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#define RUNDIR "/var/run"
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#endif
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#ifndef ETCDIR
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#define ETCDIR "/usr/local/etc"
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#endif
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int restartInterval = 1000;
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struct Set256 stopExits;
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static void parseExits(char *list) {
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setClear(&stopExits);
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while (*list) {
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byte exit = strtoul(list, &list, 10);
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if (*list) {
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if (*list != ',') errx(EX_USAGE, "invalid exit status %s", list);
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list++;
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}
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setAdd(&stopExits, exit);
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}
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}
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int main(int argc, char *argv[]) {
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bool daemonize = true;
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const char *pidPath = NULL;
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const char *configPath = ETCDIR "/spawntab";
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const char *fifoPath = RUNDIR "/spawnd.pipe";
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const char *chdirPath = "/";
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const char *user = NULL;
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const char *group = NULL;
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setAdd(&stopExits, 127);
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setAdd(&stopExits, EX_USAGE);
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setAdd(&stopExits, EX_DATAERR);
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setAdd(&stopExits, EX_NOINPUT);
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setAdd(&stopExits, EX_OSFILE);
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setAdd(&stopExits, EX_CANTCREAT);
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setAdd(&stopExits, EX_CONFIG);
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for (int opt; 0 < (opt = getopt(argc, argv, "C:c:df:g:p:s:t:u:"));) {
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switch (opt) {
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break; case 'C': chdirPath = optarg;
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break; case 'c': fifoPath = optarg;
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break; case 'd': daemonize = false;
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break; case 'f': configPath = optarg;
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break; case 'g': group = optarg;
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break; case 'p': pidPath = optarg;
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break; case 's': parseExits(optarg);
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break; case 't': restartInterval = strtoul(optarg, NULL, 10);
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break; case 'u': user = optarg;
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break; default: return EX_USAGE;
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}
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}
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int pidFile = -1;
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if (pidPath) {
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pidFile = open(
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pidPath, O_WRONLY | O_CREAT | O_EXLOCK | O_CLOEXEC, 0600
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);
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if (pidFile < 0) err(EX_CANTCREAT, "%s", pidPath);
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}
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// TODO: Read config file.
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int error = access(chdirPath, X_OK);
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if (error) err(EX_NOINPUT, "%s", chdirPath);
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// TODO: Do user, group lookup.
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// We can't lock a named pipe, so just warn if it already exists.
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error = mkfifo(fifoPath, 0600);
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if (error) {
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if (errno != EEXIST) err(EX_CANTCREAT, "%s", fifoPath);
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warn("%s", fifoPath);
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}
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int fifo = open(fifoPath, O_RDONLY | O_NONBLOCK | O_CLOEXEC);
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if (fifo < 0) err(EX_CANTCREAT, "%s", fifoPath);
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// TODO: Daemonize, write pid file.
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// TODO: Main loop.
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close(fifo);
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unlink(fifoPath);
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if (pidPath) {
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close(pidFile);
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unlink(pidPath);
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}
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}
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