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/*
* udevsend.c
*
* 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.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <stddef.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 "udev.h"
#include "udevd.h"
/* global variables */
static int sock = -1;
#ifdef USE_LOG
void log_message (int priority, const char *format, ...)
{
va_list args;
if (priority > udev_log_priority)
return;
va_start(args, format);
vsyslog(priority, format, args);
va_end(args);
}
#endif
int main(int argc, char *argv[], char *envp[])
{
static struct udevd_msg usend_msg;
int usend_msg_len;
int i;
struct sockaddr_un saddr;
socklen_t addrlen;
int bufpos = 0;
int retval = 0;
const char *subsystem = NULL;
logging_init("udevsend");
#ifdef USE_LOG
udev_config_init();
#endif
dbg("version %s", UDEV_VERSION);
sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
if (sock < 0) {
err("error getting socket: %s", strerror(errno));
retval = 1;
goto exit;
}
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;
memset(&usend_msg, 0x00, sizeof(struct udevd_msg));
strcpy(usend_msg.magic, UDEV_MAGIC);
usend_msg.type = UDEVD_UEVENT_UDEVSEND;
/* copy all keys to send buffer */
for (i = 0; envp[i]; i++) {
const char *key;
int keylen;
key = envp[i];
keylen = strlen(key);
/* ignore events which are already sent on the netlink socket */
if (strncmp(key, "SEQNUM=", 7) == 0) {
dbg("ignoring event with SEQNUM set");
retval = 0;
goto exit;
}
/* 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 (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;
}
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;
}
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