4 * Copyright (C) 2004-2005 Kay Sievers <kay.sievers@vrfy.org>
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation version 2 of the License.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 675 Mass Ave, Cambridge, MA 02139, USA.
30 #include <sys/socket.h>
32 #include <sys/select.h>
33 #include <linux/types.h>
34 #include <linux/netlink.h>
39 static int uevent_netlink_sock;
40 static int udev_monitor_sock;
41 static volatile int udev_exit;
43 static int init_udev_monitor_socket(void)
45 struct sockaddr_un saddr;
47 const int feature_on = 1;
50 memset(&saddr, 0x00, sizeof(saddr));
51 saddr.sun_family = AF_LOCAL;
52 /* use abstract namespace for socket path */
53 strcpy(&saddr.sun_path[1], "/org/kernel/udev/monitor");
54 addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path+1) + 1;
56 udev_monitor_sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
57 if (udev_monitor_sock == -1) {
58 fprintf(stderr, "error getting socket: %s\n", strerror(errno));
62 /* the bind takes care of ensuring only one copy running */
63 retval = bind(udev_monitor_sock, (struct sockaddr *) &saddr, addrlen);
65 fprintf(stderr, "bind failed: %s\n", strerror(errno));
66 close(udev_monitor_sock);
67 udev_monitor_sock = -1;
71 /* enable receiving of the sender credentials */
72 setsockopt(udev_monitor_sock, SOL_SOCKET, SO_PASSCRED, &feature_on, sizeof(feature_on));
77 static int init_uevent_netlink_sock(void)
79 struct sockaddr_nl snl;
82 memset(&snl, 0x00, sizeof(struct sockaddr_nl));
83 snl.nl_family = AF_NETLINK;
84 snl.nl_pid = getpid();
85 snl.nl_groups = 0xffffffff;
87 uevent_netlink_sock = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);
88 if (uevent_netlink_sock == -1) {
89 fprintf(stderr, "error getting socket: %s\n", strerror(errno));
93 retval = bind(uevent_netlink_sock, (struct sockaddr *) &snl,
94 sizeof(struct sockaddr_nl));
96 fprintf(stderr, "bind failed: %s\n", strerror(errno));
97 close(uevent_netlink_sock);
98 uevent_netlink_sock = -1;
105 static void asmlinkage sig_handler(int signum)
107 if (signum == SIGINT || signum == SIGTERM)
111 int main(int argc, char *argv[])
113 struct sigaction act;
119 for (i = 1 ; i < argc; i++) {
121 if (strcmp(arg, "--env") == 0 || strcmp(arg, "-e") == 0) {
124 else if (strcmp(arg, "--help") == 0 || strcmp(arg, "-h") == 0){
125 printf("Usage: udevmonitor [--env]\n"
126 " --env print the whole event environment\n"
127 " --help print this help text\n\n");
130 fprintf(stderr, "unknown option\n\n");
136 fprintf(stderr, "need to be root, exit\n\n");
140 /* set signal handlers */
141 memset(&act, 0x00, sizeof(struct sigaction));
142 act.sa_handler = (void (*)(int)) sig_handler;
143 sigemptyset(&act.sa_mask);
144 act.sa_flags = SA_RESTART;
145 sigaction(SIGINT, &act, NULL);
146 sigaction(SIGTERM, &act, NULL);
148 retval = init_udev_monitor_socket();
151 retval = init_uevent_netlink_sock();
155 printf("udevmonitor prints the received event from the kernel [UEVENT]\n"
156 "and the event which udev sends out after rule processing [UDEV]\n\n");
159 static char buf[UEVENT_BUFFER_SIZE*2];
168 if (uevent_netlink_sock > 0)
169 FD_SET(uevent_netlink_sock, &readfds);
170 if (udev_monitor_sock > 0)
171 FD_SET(udev_monitor_sock, &readfds);
173 fdcount = select(UDEV_MAX(uevent_netlink_sock, udev_monitor_sock)+1, &readfds, NULL, NULL, NULL);
176 fprintf(stderr, "error receiving uevent message: %s\n", strerror(errno));
180 if (gettimeofday(&tv, &tz) == 0) {
181 snprintf(timestr, sizeof(timestr), "%llu.%06u",
182 (unsigned long long) tv.tv_sec, (unsigned int) tv.tv_usec);
186 if ((uevent_netlink_sock > 0) && FD_ISSET(uevent_netlink_sock, &readfds)) {
187 buflen = recv(uevent_netlink_sock, &buf, sizeof(buf), 0);
189 fprintf(stderr, "error receiving uevent message: %s\n", strerror(errno));
192 printf("UEVENT[%s] %s\n", timestr, buf);
195 if ((udev_monitor_sock > 0) && FD_ISSET(udev_monitor_sock, &readfds)) {
196 buflen = recv(udev_monitor_sock, &buf, sizeof(buf), 0);
198 fprintf(stderr, "error receiving udev message: %s\n", strerror(errno));
201 printf("UDEV [%s] %s\n", timestr, buf);
207 /* print environment */
211 /* start of payload */
212 bufpos = strlen(buf) + 1;
214 while (bufpos < (size_t)buflen) {
219 keylen = strlen(key);
223 bufpos += keylen + 1;
230 if (uevent_netlink_sock > 0)
231 close(uevent_netlink_sock);
232 if (udev_monitor_sock > 0)
233 close(udev_monitor_sock);