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/* $OpenBSD: hotplugd.c,v 1.19 2023/03/08 04:43:13 guenther Exp $ */
/*
* Copyright (c) 2004 Alexander Yurchenko <grange@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* Devices hot plugging daemon.
*/
#include <sys/types.h>
#include <sys/device.h>
#include <sys/hotplug.h>
#include <sys/wait.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <libgen.h>
#include <limits.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#define _PATH_DEV_HOTPLUG "/dev/hotplug"
#define _PATH_ETC_HOTPLUG "/etc/hotplug"
#define _PATH_ETC_HOTPLUG_ATTACH _PATH_ETC_HOTPLUG "/attach"
#define _PATH_ETC_HOTPLUG_DETACH _PATH_ETC_HOTPLUG "/detach"
#define _LOG_TAG "hotplugd"
#define _LOG_FACILITY LOG_DAEMON
#define _LOG_OPT (LOG_NDELAY | LOG_PID)
volatile sig_atomic_t quit = 0;
char *device = _PATH_DEV_HOTPLUG;
int devfd = -1;
void exec_script(const char *, int, char *);
void sigchild(int);
void sigquit(int);
__dead void usage(void);
int
main(int argc, char *argv[])
{
int ch;
struct sigaction sact;
struct hotplug_event he;
while ((ch = getopt(argc, argv, "d:")) != -1)
switch (ch) {
case 'd':
device = optarg;
break;
default:
usage();
/* NOTREACHED */
}
argc -= optind;
argv += optind;
if (argc > 0)
usage();
if (unveil(device, "r") == -1)
err(1, "unveil %s", device);
if (unveil(_PATH_ETC_HOTPLUG_ATTACH, "rx") == -1)
err(1, "unveil %s", _PATH_ETC_HOTPLUG_ATTACH);
if (unveil(_PATH_ETC_HOTPLUG_DETACH, "rx") == -1)
err(1, "unveil %s", _PATH_ETC_HOTPLUG_DETACH);
if (pledge("stdio rpath proc exec", NULL) == -1)
err(1, "pledge");
if ((devfd = open(device, O_RDONLY | O_CLOEXEC)) == -1)
err(1, "%s", device);
bzero(&sact, sizeof(sact));
sigemptyset(&sact.sa_mask);
sact.sa_flags = 0;
sact.sa_handler = sigquit;
sigaction(SIGINT, &sact, NULL);
sigaction(SIGQUIT, &sact, NULL);
sigaction(SIGTERM, &sact, NULL);
sact.sa_handler = SIG_IGN;
sigaction(SIGHUP, &sact, NULL);
sact.sa_handler = sigchild;
sact.sa_flags = SA_NOCLDSTOP;
sigaction(SIGCHLD, &sact, NULL);
openlog(_LOG_TAG, _LOG_OPT, _LOG_FACILITY);
if (daemon(0, 0) == -1)
err(1, "daemon");
syslog(LOG_INFO, "started");
while (!quit) {
if (read(devfd, &he, sizeof(he)) == -1) {
if (errno == EINTR)
/* ignore */
continue;
syslog(LOG_ERR, "read: %m");
exit(1);
}
switch (he.he_type) {
case HOTPLUG_DEVAT:
syslog(LOG_INFO, "%s attached, class %d",
he.he_devname, he.he_devclass);
exec_script(_PATH_ETC_HOTPLUG_ATTACH, he.he_devclass,
he.he_devname);
break;
case HOTPLUG_DEVDT:
syslog(LOG_INFO, "%s detached, class %d",
he.he_devname, he.he_devclass);
exec_script(_PATH_ETC_HOTPLUG_DETACH, he.he_devclass,
he.he_devname);
break;
default:
syslog(LOG_NOTICE, "unknown event (0x%x)", he.he_type);
}
}
syslog(LOG_INFO, "terminated");
closelog();
close(devfd);
return (0);
}
void
exec_script(const char *file, int class, char *name)
{
char strclass[8];
pid_t pid;
snprintf(strclass, sizeof(strclass), "%d", class);
if (access(file, X_OK | R_OK) == -1) {
if (errno != ENOENT)
syslog(LOG_ERR, "%s: %m", file);
return;
}
if ((pid = fork()) == -1) {
syslog(LOG_ERR, "fork: %m");
return;
}
if (pid == 0) {
/* child process */
char filebuf[PATH_MAX];
strlcpy(filebuf, file, sizeof(filebuf));
execl(file, basename(filebuf), strclass, name, (char *)NULL);
syslog(LOG_ERR, "execl %s: %m", file);
_exit(1);
/* NOTREACHED */
}
}
void
sigchild(int signum)
{
struct syslog_data sdata = SYSLOG_DATA_INIT;
int saved_errno, status;
pid_t pid;
saved_errno = errno;
sdata.log_tag = _LOG_TAG;
sdata.log_fac = _LOG_FACILITY;
sdata.log_stat = _LOG_OPT;
while ((pid = waitpid(WAIT_ANY, &status, WNOHANG)) != 0) {
if (pid == -1) {
if (errno == EINTR)
continue;
if (errno != ECHILD)
syslog_r(LOG_ERR, &sdata, "waitpid: %m");
break;
}
if (WIFEXITED(status)) {
if (WEXITSTATUS(status) != 0) {
syslog_r(LOG_NOTICE, &sdata,
"child exit status: %d",
WEXITSTATUS(status));
}
} else {
syslog_r(LOG_NOTICE, &sdata,
"child is terminated abnormally");
}
}
errno = saved_errno;
}
void
sigquit(int signum)
{
quit = 1;
}
__dead void
usage(void)
{
extern char *__progname;
fprintf(stderr, "usage: %s [-d device]\n", __progname);
exit(1);
}
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