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.
29 #include <sys/socket.h>
31 #include <sys/select.h>
32 #include <linux/types.h>
33 #include <linux/netlink.h>
37 #include "udev_utils.h"
38 #include "udev_libc_wrapper.h"
40 static int uevent_netlink_sock;
41 static int udev_monitor_sock;
42 static volatile int udev_exit;
44 static int init_udev_monitor_socket(void)
46 struct sockaddr_un saddr;
48 const int feature_on = 1;
51 memset(&saddr, 0x00, sizeof(saddr));
52 saddr.sun_family = AF_LOCAL;
53 /* use abstract namespace for socket path */
54 strcpy(&saddr.sun_path[1], "/org/kernel/udev/monitor");
55 addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path+1) + 1;
57 udev_monitor_sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
58 if (udev_monitor_sock == -1) {
59 fprintf(stderr, "error getting socket, %s\n", strerror(errno));
63 /* the bind takes care of ensuring only one copy running */
64 retval = bind(udev_monitor_sock, (struct sockaddr *) &saddr, addrlen);
66 fprintf(stderr, "bind failed, %s\n", strerror(errno));
67 close(udev_monitor_sock);
68 udev_monitor_sock = -1;
72 /* enable receiving of the sender credentials */
73 setsockopt(udev_monitor_sock, SOL_SOCKET, SO_PASSCRED, &feature_on, sizeof(feature_on));
78 static int init_uevent_netlink_sock(void)
80 struct sockaddr_nl snl;
83 memset(&snl, 0x00, sizeof(struct sockaddr_nl));
84 snl.nl_family = AF_NETLINK;
85 snl.nl_pid = getpid();
86 snl.nl_groups = 0xffffffff;
88 uevent_netlink_sock = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);
89 if (uevent_netlink_sock == -1) {
90 fprintf(stderr, "error getting socket, %s\n", strerror(errno));
94 retval = bind(uevent_netlink_sock, (struct sockaddr *) &snl,
95 sizeof(struct sockaddr_nl));
97 fprintf(stderr, "bind failed, %s\n", strerror(errno));
98 close(uevent_netlink_sock);
99 uevent_netlink_sock = -1;
106 static void asmlinkage sig_handler(int signum)
108 if (signum == SIGINT || signum == SIGTERM)
112 int main(int argc, char *argv[])
114 struct sigaction act;
120 for (i = 1 ; i < argc; i++) {
122 if (strcmp(arg, "--env") == 0 || strcmp(arg, "-e") == 0) {
125 else if (strcmp(arg, "--help") == 0 || strcmp(arg, "-h") == 0){
126 printf("Usage: udevmonitor [--env]\n"
127 " --env print the whole event environment\n"
128 " --help print this help text\n\n");
131 fprintf(stderr, "unknown option\n\n");
137 fprintf(stderr, "need to be root, exit\n\n");
141 /* set signal handlers */
142 memset(&act, 0x00, sizeof(struct sigaction));
143 act.sa_handler = (void (*)(int)) sig_handler;
144 sigemptyset(&act.sa_mask);
145 act.sa_flags = SA_RESTART;
146 sigaction(SIGINT, &act, NULL);
147 sigaction(SIGTERM, &act, NULL);
149 retval = init_udev_monitor_socket();
152 retval = init_uevent_netlink_sock();
156 printf("udevmonitor prints the received event from the kernel [UEVENT]\n"
157 "and the event which udev sends out after rule processing [UDEV]\n\n");
160 static 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\n");
178 if ((uevent_netlink_sock > 0) && FD_ISSET(uevent_netlink_sock, &readfds)) {
179 buflen = recv(uevent_netlink_sock, &buf, sizeof(buf), 0);
181 fprintf(stderr, "error receiving uevent message\n");
184 printf("UEVENT[%i] %s\n", time(NULL), buf);
187 if ((udev_monitor_sock > 0) && FD_ISSET(udev_monitor_sock, &readfds)) {
188 buflen = recv(udev_monitor_sock, &buf, sizeof(buf), 0);
190 fprintf(stderr, "error receiving udev message\n");
193 printf("UDEV [%i] %s\n", time(NULL), buf);
199 /* print environment */
203 /* start of payload */
204 bufpos = strlen(buf) + 1;
206 while (bufpos < (size_t)buflen) {
211 keylen = strlen(key);
215 bufpos += keylen + 1;
222 if (uevent_netlink_sock > 0)
223 close(uevent_netlink_sock);
224 if (udev_monitor_sock > 0)
225 close(udev_monitor_sock);