2 * Copyright (C) 2004-2006 Kay Sievers <kay.sievers@vrfy.org>
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the
6 * Free Software Foundation version 2 of the License.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
28 #include <sys/socket.h>
30 #include <sys/select.h>
31 #include <linux/types.h>
32 #include <linux/netlink.h>
37 static int uevent_netlink_sock = -1;
38 static int udev_monitor_sock = -1;
39 static volatile int udev_exit;
41 static int init_udev_monitor_socket(void)
43 struct sockaddr_un saddr;
45 const int feature_on = 1;
48 memset(&saddr, 0x00, sizeof(saddr));
49 saddr.sun_family = AF_LOCAL;
50 /* use abstract namespace for socket path */
51 strcpy(&saddr.sun_path[1], "/org/kernel/udev/monitor");
52 addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path+1) + 1;
54 udev_monitor_sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
55 if (udev_monitor_sock == -1) {
56 fprintf(stderr, "error getting socket: %s\n", strerror(errno));
60 /* the bind takes care of ensuring only one copy running */
61 retval = bind(udev_monitor_sock, (struct sockaddr *) &saddr, addrlen);
63 fprintf(stderr, "bind failed: %s\n", strerror(errno));
64 close(udev_monitor_sock);
65 udev_monitor_sock = -1;
69 /* enable receiving of the sender credentials */
70 setsockopt(udev_monitor_sock, SOL_SOCKET, SO_PASSCRED, &feature_on, sizeof(feature_on));
75 static int init_uevent_netlink_sock(void)
77 struct sockaddr_nl snl;
80 memset(&snl, 0x00, sizeof(struct sockaddr_nl));
81 snl.nl_family = AF_NETLINK;
82 snl.nl_pid = getpid();
85 uevent_netlink_sock = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);
86 if (uevent_netlink_sock == -1) {
87 fprintf(stderr, "error getting socket: %s\n", strerror(errno));
91 retval = bind(uevent_netlink_sock, (struct sockaddr *) &snl,
92 sizeof(struct sockaddr_nl));
94 fprintf(stderr, "bind failed: %s\n", strerror(errno));
95 close(uevent_netlink_sock);
96 uevent_netlink_sock = -1;
103 static void asmlinkage sig_handler(int signum)
105 if (signum == SIGINT || signum == SIGTERM)
109 int main(int argc, char *argv[])
111 struct sigaction act;
117 for (i = 1 ; i < argc; i++) {
119 if (strcmp(arg, "--env") == 0 || strcmp(arg, "-e") == 0)
121 else if (strcmp(arg, "--help") == 0 || strcmp(arg, "-h") == 0){
122 printf("Usage: udevmonitor [--help] [--env]\n"
123 " --env print the whole event environment\n"
124 " --help print this help text\n\n");
127 fprintf(stderr, "unrecognized option '%s'\n", arg);
133 fprintf(stderr, "root privileges required\n");
137 /* set signal handlers */
138 memset(&act, 0x00, sizeof(struct sigaction));
139 act.sa_handler = (void (*)(int)) sig_handler;
140 sigemptyset(&act.sa_mask);
141 act.sa_flags = SA_RESTART;
142 sigaction(SIGINT, &act, NULL);
143 sigaction(SIGTERM, &act, NULL);
145 retval = init_udev_monitor_socket();
149 retval = init_uevent_netlink_sock();
153 printf("udevmonitor prints the received event from the kernel [UEVENT]\n"
154 "and the event which udev sends out after rule processing [UDEV]\n\n");
157 char buf[UEVENT_BUFFER_SIZE*2];
166 if (uevent_netlink_sock >= 0)
167 FD_SET(uevent_netlink_sock, &readfds);
168 if (udev_monitor_sock >= 0)
169 FD_SET(udev_monitor_sock, &readfds);
171 fdcount = select(UDEV_MAX(uevent_netlink_sock, udev_monitor_sock)+1, &readfds, NULL, NULL, NULL);
174 fprintf(stderr, "error receiving uevent message: %s\n", strerror(errno));
178 if (gettimeofday(&tv, &tz) == 0) {
179 snprintf(timestr, sizeof(timestr), "%llu.%06u",
180 (unsigned long long) tv.tv_sec, (unsigned int) tv.tv_usec);
184 if ((uevent_netlink_sock >= 0) && FD_ISSET(uevent_netlink_sock, &readfds)) {
185 buflen = recv(uevent_netlink_sock, &buf, sizeof(buf), 0);
187 fprintf(stderr, "error receiving uevent message: %s\n", strerror(errno));
190 printf("UEVENT[%s] %s\n", timestr, buf);
193 if ((udev_monitor_sock >= 0) && FD_ISSET(udev_monitor_sock, &readfds)) {
194 buflen = recv(udev_monitor_sock, &buf, sizeof(buf), 0);
196 fprintf(stderr, "error receiving udev message: %s\n", strerror(errno));
199 printf("UDEV [%s] %s\n", timestr, buf);
205 /* print environment */
209 /* start of payload */
210 bufpos = strlen(buf) + 1;
212 while (bufpos < (size_t)buflen) {
217 keylen = strlen(key);
221 bufpos += keylen + 1;
228 if (uevent_netlink_sock >= 0)
229 close(uevent_netlink_sock);
230 if (udev_monitor_sock >= 0)
231 close(udev_monitor_sock);