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/*
* udevmonitor.c
*
* Copyright (C) 2004-2005 Kay Sievers <kay.sievers@vrfy.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <time.h>
#include <errno.h>
#include <signal.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/select.h>
#include <linux/types.h>
#include <linux/netlink.h>
#include "udev.h"
#include "udevd.h"
#include "udev_utils.h"
#include "udev_libc_wrapper.h"
static int uevent_netlink_sock;
static int udev_monitor_sock;
static volatile int udev_exit;
static int init_udev_monitor_socket(void)
{
struct sockaddr_un saddr;
socklen_t addrlen;
const int feature_on = 1;
int retval;
memset(&saddr, 0x00, sizeof(saddr));
saddr.sun_family = AF_LOCAL;
/* use abstract namespace for socket path */
strcpy(&saddr.sun_path[1], "/org/kernel/udev/monitor");
addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path+1) + 1;
udev_monitor_sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
if (udev_monitor_sock == -1) {
fprintf(stderr, "error getting socket, %s\n", strerror(errno));
return -1;
}
/* the bind takes care of ensuring only one copy running */
retval = bind(udev_monitor_sock, (struct sockaddr *) &saddr, addrlen);
if (retval < 0) {
fprintf(stderr, "bind failed, %s\n", strerror(errno));
close(udev_monitor_sock);
udev_monitor_sock = -1;
return -1;
}
/* enable receiving of the sender credentials */
setsockopt(udev_monitor_sock, SOL_SOCKET, SO_PASSCRED, &feature_on, sizeof(feature_on));
return 0;
}
static int init_uevent_netlink_sock(void)
{
struct sockaddr_nl snl;
int retval;
memset(&snl, 0x00, sizeof(struct sockaddr_nl));
snl.nl_family = AF_NETLINK;
snl.nl_pid = getpid();
snl.nl_groups = 0xffffffff;
uevent_netlink_sock = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);
if (uevent_netlink_sock == -1) {
fprintf(stderr, "error getting socket, %s\n", strerror(errno));
return -1;
}
retval = bind(uevent_netlink_sock, (struct sockaddr *) &snl,
sizeof(struct sockaddr_nl));
if (retval < 0) {
fprintf(stderr, "bind failed, %s\n", strerror(errno));
close(uevent_netlink_sock);
uevent_netlink_sock = -1;
return -1;
}
return 0;
}
static void asmlinkage sig_handler(int signum)
{
if (signum == SIGINT || signum == SIGTERM)
udev_exit = 1;
}
int main(int argc, char *argv[])
{
struct sigaction act;
int env = 0;
fd_set readfds;
int i;
int retval = 0;
for (i = 1 ; i < argc; i++) {
char *arg = argv[i];
if (strcmp(arg, "--env") == 0 || strcmp(arg, "-e") == 0) {
env = 1;
}
else if (strcmp(arg, "--help") == 0 || strcmp(arg, "-h") == 0){
printf("Usage: udevmonitor [--env]\n"
" --env print the whole event environment\n"
" --help print this help text\n\n");
exit(0);
} else {
fprintf(stderr, "unknown option\n\n");
exit(1);
}
}
if (getuid() != 0) {
fprintf(stderr, "need to be root, exit\n\n");
exit(2);
}
/* set signal handlers */
memset(&act, 0x00, sizeof(struct sigaction));
act.sa_handler = (void (*)(int)) sig_handler;
sigemptyset(&act.sa_mask);
act.sa_flags = SA_RESTART;
sigaction(SIGINT, &act, NULL);
sigaction(SIGTERM, &act, NULL);
retval = init_udev_monitor_socket();
if (retval)
goto out;
retval = init_uevent_netlink_sock();
if (retval)
goto out;
printf("udevmonitor prints the received event from the kernel [UEVENT]\n"
"and the event which udev sends out after rule processing [UDEV]\n\n");
while (!udev_exit) {
static char buf[UEVENT_BUFFER_SIZE*2];
ssize_t buflen;
int fdcount;
buflen = 0;
FD_ZERO(&readfds);
if (uevent_netlink_sock > 0)
FD_SET(uevent_netlink_sock, &readfds);
if (udev_monitor_sock > 0)
FD_SET(udev_monitor_sock, &readfds);
fdcount = select(UDEV_MAX(uevent_netlink_sock, udev_monitor_sock)+1, &readfds, NULL, NULL, NULL);
if (fdcount < 0) {
if (errno != EINTR)
fprintf(stderr, "error receiving uevent message\n");
continue;
}
if ((uevent_netlink_sock > 0) && FD_ISSET(uevent_netlink_sock, &readfds)) {
buflen = recv(uevent_netlink_sock, &buf, sizeof(buf), 0);
if (buflen <= 0) {
fprintf(stderr, "error receiving uevent message\n");
continue;
}
printf("UEVENT[%llu] %s\n", (unsigned long long) time(NULL), buf);
}
if ((udev_monitor_sock > 0) && FD_ISSET(udev_monitor_sock, &readfds)) {
buflen = recv(udev_monitor_sock, &buf, sizeof(buf), 0);
if (buflen <= 0) {
fprintf(stderr, "error receiving udev message\n");
continue;
}
printf("UDEV [%llu] %s\n", (unsigned long long) time(NULL), buf);
}
if (buflen == 0)
continue;
/* print environment */
if (env) {
size_t bufpos;
/* start of payload */
bufpos = strlen(buf) + 1;
while (bufpos < (size_t)buflen) {
int keylen;
char *key;
key = &buf[bufpos];
keylen = strlen(key);
if (keylen == 0)
break;
printf("%s\n", key);
bufpos += keylen + 1;
}
printf("\n");
}
}
out:
if (uevent_netlink_sock > 0)
close(uevent_netlink_sock);
if (udev_monitor_sock > 0)
close(udev_monitor_sock);
if (retval)
return 3;
return 0;
}
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