#include <sys/socket.h>
#include <sys/wait.h>
#include <sys/un.h>
+#include <time.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
+#include <stddef.h>
#include <string.h>
#include <unistd.h>
-#include <time.h>
+#include <linux/stddef.h>
#include "udev.h"
#include "udev_version.h"
#include "udevd.h"
#include "logging.h"
-unsigned char logname[42];
+/* global variables */
+static int sock = -1;
-static inline char *get_action(void)
+#ifdef USE_LOG
+void log_message (int priority, const char *format, ...)
{
- char *action;
+ va_list args;
- action = getenv("ACTION");
- return action;
-}
+ if (priority > udev_log_priority)
+ return;
-static inline char *get_devpath(void)
-{
- char *devpath;
-
- devpath = getenv("DEVPATH");
- return devpath;
-}
-
-static inline char *get_seqnum(void)
-{
- char *seqnum;
-
- seqnum = getenv("SEQNUM");
- return seqnum;
-}
-
-static int build_hotplugmsg(struct hotplug_msg *msg, char *action,
- char *devpath, char *subsystem, int seqnum)
-{
- memset(msg, 0x00, sizeof(*msg));
- strfieldcpy(msg->magic, UDEV_MAGIC);
- msg->seqnum = seqnum;
- strncpy(msg->action, action, 8);
- strncpy(msg->devpath, devpath, 128);
- strncpy(msg->subsystem, subsystem, 16);
- return sizeof(struct hotplug_msg);
+ va_start(args, format);
+ vsyslog(priority, format, args);
+ va_end(args);
}
+#endif
static int start_daemon(void)
{
pid_t pid;
pid_t child_pid;
+ char *const argv[] = { "udevd", NULL };
+ char *const envp[] = { NULL };
pid = fork();
switch (pid) {
child_pid = fork();
switch (child_pid) {
case 0:
- /* daemon */
- setsid();
- chdir("/");
- execl(UDEVD_BIN, "udevd", NULL);
- dbg("exec of daemon failed");
- exit(1);
+ /* daemon with empty environment */
+ close(sock);
+ execve(UDEVD_BIN, argv, envp);
+ err("exec of daemon failed");
+ _exit(1);
case -1:
- dbg("fork of daemon failed");
+ err("fork of daemon failed");
return -1;
default:
exit(0);
}
break;
case -1:
- dbg("fork of helper failed");
+ err("fork of helper failed");
return -1;
default:
- wait(NULL);
+ waitpid(pid, NULL, 0);
}
return 0;
}
-int main(int argc, char* argv[])
+static void run_udev(const char *subsystem)
+{
+ char *const argv[] = { "udev", (char *)subsystem, NULL };
+ pid_t pid;
+
+ pid = fork();
+ switch (pid) {
+ case 0:
+ /* child */
+ execv(UDEV_BIN, argv);
+ err("exec of udev child failed");
+ _exit(1);
+ break;
+ case -1:
+ err("fork of udev child failed");
+ break;
+ default:
+ waitpid(pid, NULL, 0);
+ }
+}
+
+int main(int argc, char *argv[], char *envp[])
{
- struct hotplug_msg message;
- char *action;
- char *devpath;
- char *subsystem;
- char *seqnum;
- int seq;
- int retval = -EINVAL;
- int size;
+ static struct udevsend_msg usend_msg;
+ int usend_msg_len;
+ int i;
int loop;
- struct timespec tspec;
- int sock;
struct sockaddr_un saddr;
+ socklen_t addrlen;
+ int bufpos = 0;
+ int retval = 1;
+ int started_daemon = 0;
+ const char *subsystem = NULL;
+
+ logging_init("udevsend");
+#ifdef USE_LOG
+ udev_init_config();
+#endif
+ dbg("version %s", UDEV_VERSION);
+
+ sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
+ if (sock == -1) {
+ err("error getting socket");
+ goto fallback;
+ }
- init_logging("udevsend");
+ memset(&saddr, 0x00, sizeof(struct sockaddr_un));
+ saddr.sun_family = AF_LOCAL;
+ /* use abstract namespace for socket path */
+ strcpy(&saddr.sun_path[1], UDEVD_SOCK_PATH);
+ addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path+1) + 1;
- subsystem = argv[1];
- if (subsystem == NULL) {
- dbg("no subsystem");
- goto exit;
- }
+ memset(&usend_msg, 0x00, sizeof(struct udevsend_msg));
+ strcpy(usend_msg.magic, UDEV_MAGIC);
- devpath = get_devpath();
- if (devpath == NULL) {
- dbg("no devpath");
- goto exit;
- }
+ /* copy all keys to send buffer */
+ for (i = 0; envp[i]; i++) {
+ const char *key;
+ int keylen;
- action = get_action();
- if (action == NULL) {
- dbg("no action");
- goto exit;
- }
+ key = envp[i];
+ keylen = strlen(key);
- seqnum = get_seqnum();
- if (seqnum == NULL) {
- dbg("no seqnum");
- goto exit;
- }
- seq = atoi(seqnum);
+ /* prevent loops in the scripts we execute */
+ if (strncmp(key, "UDEVD_EVENT=", 12) == 0) {
+ dbg("seems that the event source is not the kernel, just exit");
+ goto exit;
+ }
- sock = socket(AF_LOCAL, SOCK_STREAM, 0);
- if (sock == -1) {
- dbg("error getting socket");
- goto exit;
+ if (bufpos + keylen >= HOTPLUG_BUFFER_SIZE-1) {
+ err("environment buffer too small, probably not called by the kernel");
+ continue;
+ }
+
+ /* remember the SUBSYSTEM */
+ if (strncmp(key, "SUBSYSTEM=", 10) == 0)
+ subsystem = &key[10];
+
+ dbg("add '%s' to env[%i] buffer", key, i);
+ strcpy(&usend_msg.envbuf[bufpos], key);
+ bufpos += keylen + 1;
+ }
+ /* older kernels passed the SUBSYSTEM only as the first argument */
+ if (!subsystem && argc == 2) {
+ bufpos += sprintf(&usend_msg.envbuf[bufpos], "SUBSYSTEM=%s", argv[1]) + 1;
+ dbg("add 'SUBSYSTEM=%s' to env[%i] buffer from argv", argv[1], i);
}
- memset(&saddr, 0x00, sizeof(saddr));
- saddr.sun_family = AF_LOCAL;
- strcpy(saddr.sun_path, UDEVD_SOCK);
-
- /* try to connect, if it fails start daemon */
- retval = connect(sock, &saddr, sizeof(saddr));
- if (retval != -1) {
- goto send;
- } else {
- dbg("connect failed, try starting daemon...");
- retval = start_daemon();
- if (retval == 0) {
- dbg("daemon started");
- } else {
- dbg("error starting daemon");
+ usend_msg_len = offsetof(struct udevsend_msg, envbuf) + bufpos;
+ dbg("usend_msg_len=%i", usend_msg_len);
+
+ /* If we can't send, try to start daemon and resend message */
+ loop = SEND_WAIT_MAX_SECONDS * SEND_WAIT_LOOP_PER_SECOND;
+ while (--loop) {
+ retval = sendto(sock, &usend_msg, usend_msg_len, 0, (struct sockaddr *)&saddr, addrlen);
+ if (retval != -1) {
+ retval = 0;
goto exit;
}
- }
- /* try to connect while daemon to starts */
- tspec.tv_sec = 0;
- tspec.tv_nsec = 100000000; /* 100 millisec */
- loop = UDEVSEND_CONNECT_RETRY;
- while (loop--) {
- retval = connect(sock, &saddr, sizeof(saddr));
- if (retval != -1)
- goto send;
- else
- dbg("retry to connect %d",
- UDEVSEND_CONNECT_RETRY - loop);
- nanosleep(&tspec, NULL);
- }
- dbg("error connecting to daemon, start daemon failed");
- goto exit;
-
-send:
- size = build_hotplugmsg(&message, action, devpath, subsystem, seq);
- retval = send(sock, &message, size, 0);
- if (retval == -1) {
- dbg("error sending message");
- close (sock);
- goto exit;
+ if (errno != ECONNREFUSED) {
+ err("error sending message (%s)", strerror(errno));
+ goto fallback;
+ }
+
+ if (!started_daemon) {
+ info("try to start udevd daemon");
+ retval = start_daemon();
+ if (retval) {
+ dbg("error starting daemon");
+ goto fallback;
+ }
+ dbg("udevd daemon started");
+ started_daemon = 1;
+ } else {
+ dbg("retry to connect %d", SEND_WAIT_MAX_SECONDS * SEND_WAIT_LOOP_PER_SECOND - loop);
+ usleep(1000 * 1000 / SEND_WAIT_LOOP_PER_SECOND);
+ }
}
- close (sock);
- return 0;
+
+fallback:
+ err("unable to connect to event daemon, try to call udev directly");
+ run_udev(subsystem);
exit:
- return 1;
+ if (sock != -1)
+ close(sock);
+
+ logging_close();
+
+ return retval;
}
~ianmdlvl / elogind.git / blobdiff