/*
* udevsend.c
*
- * Userspace devfs
- *
* Copyright (C) 2004 Ling, Xiaofeng <xiaofeng.ling@intel.com>
* Copyright (C) 2004 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.
*
*/
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <sys/wait.h>
-#include <sys/un.h>
-#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
-#include <string.h>
#include <unistd.h>
+#include <string.h>
#include <time.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/wait.h>
+#include <sys/un.h>
#include <linux/stddef.h>
#include "udev.h"
#include "udevd.h"
#include "logging.h"
-#ifdef LOG
-unsigned char logname[42];
-void log_message (int level, const char *format, ...)
+/* global variables */
+static int sock = -1;
+
+#ifdef USE_LOG
+void log_message (int priority, const char *format, ...)
{
- va_list args;
+ va_list args;
+
+ if (priority > udev_log_priority)
+ return;
va_start(args, format);
- vsyslog(level, format, args);
+ vsyslog(priority, format, args);
va_end(args);
}
#endif
-static int build_hotplugmsg(struct hotplug_msg *msg, char *action,
- char *devpath, char *subsystem, int seqnum)
+int main(int argc, char *argv[], char *envp[])
{
- memset(msg, 0x00, sizeof(*msg));
- strfieldcpy(msg->magic, UDEV_MAGIC);
- msg->seqnum = seqnum;
- strfieldcpy(msg->action, action);
- strfieldcpy(msg->devpath, devpath);
- strfieldcpy(msg->subsystem, subsystem);
- return sizeof(struct hotplug_msg);
-}
-
-static int start_daemon(void)
-{
- pid_t pid;
- pid_t child_pid;
-
- pid = fork();
- switch (pid) {
- case 0:
- /* helper child */
- child_pid = fork();
- switch (child_pid) {
- case 0:
- /* daemon */
- setsid();
- chdir("/");
- execl(UDEVD_BIN, "udevd", NULL);
- dbg("exec of daemon failed");
- exit(1);
- case -1:
- dbg("fork of daemon failed");
- return -1;
- default:
- exit(0);
- }
- break;
- case -1:
- dbg("fork of helper failed");
- return -1;
- default:
- wait(NULL);
- }
- return 0;
-}
-
-int main(int argc, char* argv[])
-{
- struct hotplug_msg msg;
- char *action;
- char *devpath;
- char *subsystem;
- char *seqnum;
- int seq;
- int retval = 1;
- int size;
- int loop;
- struct timespec tspec;
- int sock;
+ static struct udevd_msg usend_msg;
+ int usend_msg_len;
+ int i;
struct sockaddr_un saddr;
socklen_t addrlen;
- int started_daemon = 0;
+ int bufpos = 0;
+ int retval = 0;
+ const char *subsystem = NULL;
-#ifdef DEBUG
- init_logging("udevsend");
+ logging_init("udevsend");
+#ifdef USE_LOG
+ udev_init_config();
#endif
dbg("version %s", UDEV_VERSION);
- subsystem = get_subsystem(argv[1]);
- if (subsystem == NULL) {
- dbg("no subsystem");
- goto exit;
- }
- dbg("subsystem = '%s'", subsystem);
-
- devpath = get_devpath();
- if (devpath == NULL) {
- dbg("no devpath");
- goto exit;
- }
- dbg("DEVPATH = '%s'", devpath);
-
- action = get_action();
- if (action == NULL) {
- dbg("no action");
- goto exit;
- }
- dbg("ACTION = '%s'", action);
-
- seqnum = get_seqnum();
- if (seqnum == NULL)
- seq = -1;
- else
- seq = atoi(seqnum);
- dbg("SEQNUM = '%d'", seq);
-
sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
- if (sock == -1) {
- dbg("error getting socket");
+ if (sock < 0) {
+ err("error getting socket: %s", strerror(errno));
+ retval = 1;
goto exit;
}
- memset(&saddr, 0x00, sizeof(saddr));
+ 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;
- size = build_hotplugmsg(&msg, action, devpath, subsystem, seq);
+ memset(&usend_msg, 0x00, sizeof(struct udevd_msg));
+ strcpy(usend_msg.magic, UDEV_MAGIC);
+ usend_msg.type = UDEVD_UEVENT_UDEVSEND;
- /* If we can't send, try to start daemon and resend message */
- loop = UDEVSEND_CONNECT_RETRY;
- while (loop--) {
- retval = sendto(sock, &msg, size, 0, (struct sockaddr *)&saddr, addrlen);
- if (retval != -1) {
- retval = 0;
- goto close_and_exit;
- }
-
- if (errno != ECONNREFUSED) {
- dbg("error sending message");
- goto close_and_exit;
+ /* copy all keys to send buffer */
+ for (i = 0; envp[i]; i++) {
+ const char *key;
+ int keylen;
+
+ key = envp[i];
+ keylen = strlen(key);
+
+ /* prevent loops in the scripts we execute */
+ if (strncmp(key, "UDEVD_EVENT=", 12) == 0) {
+ err("event loop, already passed through the daemon, exit");
+ retval = 2;
+ goto exit;
}
-
- if (!started_daemon) {
- dbg("connect failed, try starting daemon...");
- retval = start_daemon();
- if (retval) {
- dbg("error starting daemon");
- goto exit;
- }
-
- dbg("daemon started");
- started_daemon = 1;
- } else {
- dbg("retry to connect %d", UDEVSEND_CONNECT_RETRY - loop);
- tspec.tv_sec = 0;
- tspec.tv_nsec = 100000000; /* 100 millisec */
- nanosleep(&tspec, NULL);
+
+ if (bufpos + keylen >= UEVENT_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;
}
-
-close_and_exit:
- close(sock);
+
+ usend_msg_len = offsetof(struct udevd_msg, envbuf) + bufpos;
+ dbg("usend_msg_len=%i", usend_msg_len);
+
+ if (sendto(sock, &usend_msg, usend_msg_len, 0, (struct sockaddr *)&saddr, addrlen) < 0) {
+ retval = 3;
+ err("error sending message: %s", strerror(errno));
+ }
+
exit:
+ if (sock != -1)
+ close(sock);
+
+ logging_close();
return retval;
}
~ianmdlvl / elogind.git / blobdiff