mirror of
https://github.com/systemd/systemd-stable.git
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225 lines
5.0 KiB
C
225 lines
5.0 KiB
C
/*
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* udevsend.c
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*
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* Userspace devfs
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*
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* Copyright (C) 2004 Ling, Xiaofeng <xiaofeng.ling@intel.com>
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* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
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*
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/wait.h>
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#include <sys/un.h>
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#include <time.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <string.h>
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#include <unistd.h>
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#include <linux/stddef.h>
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#include "udev.h"
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#include "udev_version.h"
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#include "udevd.h"
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#include "logging.h"
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/* global variables */
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static int sock = -1;
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#ifdef LOG
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unsigned char logname[LOGNAME_SIZE];
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void log_message (int level, const char *format, ...)
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{
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va_list args;
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va_start(args, format);
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vsyslog(level, format, args);
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va_end(args);
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}
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#endif
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static int start_daemon(void)
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{
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pid_t pid;
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pid_t child_pid;
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pid = fork();
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switch (pid) {
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case 0:
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/* helper child */
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child_pid = fork();
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switch (child_pid) {
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case 0:
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/* daemon */
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close(sock);
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execl(UDEVD_BIN, "udevd", NULL);
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dbg("exec of daemon failed");
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_exit(1);
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case -1:
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dbg("fork of daemon failed");
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return -1;
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default:
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exit(0);
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}
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break;
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case -1:
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dbg("fork of helper failed");
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return -1;
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default:
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waitpid(pid, NULL, 0);
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}
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return 0;
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}
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static void run_udev(const char *subsystem)
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{
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pid_t pid;
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pid = fork();
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switch (pid) {
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case 0:
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/* child */
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execl(UDEV_BIN, "udev", subsystem, NULL);
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dbg("exec of child failed");
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_exit(1);
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break;
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case -1:
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dbg("fork of child failed");
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break;
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default:
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waitpid(pid, NULL, 0);
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}
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}
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int main(int argc, char *argv[], char *envp[])
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{
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static struct udevsend_msg usend_msg;
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int usend_msg_len;
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int i;
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int loop;
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struct sockaddr_un saddr;
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socklen_t addrlen;
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const char *subsystem_argv;
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int subsystem_env = 0;
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int bufpos = 0;
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int retval = 1;
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int started_daemon = 0;
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logging_init("udevsend");
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dbg("version %s", UDEV_VERSION);
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subsystem_argv = argv[1];
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if (subsystem_argv == NULL) {
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dbg("no subsystem");
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goto exit;
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}
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/* prevent loops in the scripts we execute */
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if (getenv("MANAGED_EVENT") != NULL) {
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dbg("seems that the event source is not the kernel, just exit");
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goto exit;
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}
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sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
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if (sock == -1) {
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dbg("error getting socket");
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goto fallback;
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}
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memset(&saddr, 0x00, sizeof(struct sockaddr_un));
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saddr.sun_family = AF_LOCAL;
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/* use abstract namespace for socket path */
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strcpy(&saddr.sun_path[1], UDEVD_SOCK_PATH);
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addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path+1) + 1;
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memset(&usend_msg, 0x00, sizeof(struct udevsend_msg));
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strcpy(usend_msg.magic, UDEV_MAGIC);
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/* copy all keys to send buffer */
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for (i = 0; envp[i]; i++) {
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const char *key;
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int keylen;
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key = envp[i];
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keylen = strlen(key);
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if (bufpos + keylen >= HOTPLUG_BUFFER_SIZE-1) {
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dbg("environment buffer too small, probably not called by the kernel");
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continue;
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}
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/* older kernels do not have the SUBSYSTEM in the environment */
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if (strncmp(key, "SUBSYSTEM=", 10) == 0)
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subsystem_env = 1;
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dbg("add '%s' to env[%i] buffer", key, i);
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strcpy(&usend_msg.envbuf[bufpos], key);
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bufpos += keylen + 1;
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}
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if (!subsystem_env) {
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bufpos += sprintf(&usend_msg.envbuf[bufpos], "SUBSYSTEM=%s", subsystem_argv) + 1;
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dbg("add 'SUBSYSTEM=%s' to env[%i] buffer from argv", subsystem_argv, i);
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}
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usend_msg_len = offsetof(struct udevsend_msg, envbuf) + bufpos;
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dbg("usend_msg_len=%i", usend_msg_len);
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/* If we can't send, try to start daemon and resend message */
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loop = SEND_WAIT_MAX_SECONDS * SEND_WAIT_LOOP_PER_SECOND;
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while (--loop) {
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retval = sendto(sock, &usend_msg, usend_msg_len, 0, (struct sockaddr *)&saddr, addrlen);
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if (retval != -1) {
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retval = 0;
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goto exit;
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}
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if (errno != ECONNREFUSED) {
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dbg("error sending message (%s)", strerror(errno));
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goto fallback;
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}
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if (!started_daemon) {
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dbg("try to start udevd daemon");
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retval = start_daemon();
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if (retval) {
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info("error starting daemon");
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goto fallback;
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}
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info("udevd daemon started");
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started_daemon = 1;
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} else {
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dbg("retry to connect %d", SEND_WAIT_MAX_SECONDS * SEND_WAIT_LOOP_PER_SECOND - loop);
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usleep(1000 * 1000 / SEND_WAIT_LOOP_PER_SECOND);
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}
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}
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fallback:
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info("unable to connect to event daemon, try to call udev directly");
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run_udev(subsystem_argv);
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exit:
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if (sock != -1)
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close(sock);
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logging_close();
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return retval;
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}
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