140 lines
4.7 KiB
C
140 lines
4.7 KiB
C
/* Copyright (c) 2012, The Linux Foundation. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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* * Neither the name of The Linux Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
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* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <stdio.h>
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/* magic string to reboot upon reading */
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#define REBOOT_STR "REBOOT"
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#define EDL_REBOOT_STR "EDL-REBOOT"
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/* size to make read buffer */
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#define MAX_BUF 64
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/* name of named pipe to read from */
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#define FIFO_NAME "/dev/rebooterdev"
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/* owning user of the named pipe */
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#define UID 0
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/* owning group of the named pipe */
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#define GID 1301
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#ifdef DEBUG
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#define debug_printf(args...) fprintf(stderr,"DEBUG: " args)
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#else
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#define debug_printf(args...) ;
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#endif
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int main() {
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int pipe_fd; // file descriptor for fifo
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char buf[MAX_BUF]; // buffer to store read data in
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int read_count; //numbef of characters read
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/* delete the fifo if it already exists */
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debug_printf("Unlinking\n");
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if(unlink(FIFO_NAME) == -1) {
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if (errno != ENOENT) {
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debug_printf("unlink failed: %s\n", strerror(errno));
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}
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/* if the file does not exist to be deleted, that is ok */
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}
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/* create fifo with rw for owner and group */
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debug_printf("mknodding\n");
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if(mknod(FIFO_NAME, S_IFIFO | 0660,0) == -1) {
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debug_printf("mknod failed: %s\n", strerror(errno));
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return 1;
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}
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/* set fifo to user rw, group w */
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debug_printf("chmodding\n");
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if(chmod(FIFO_NAME, 0620) == -1) {
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debug_printf("chmod failed: %s\n", strerror(errno));
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return 1;
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}
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/* change fifo owner to rebooters group */
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debug_printf("chowning\n");
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if(chown(FIFO_NAME,UID,GID) == -1) {
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debug_printf("chown failed: %s\n", strerror(errno));
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return 1;
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}
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/* read and open forever */
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while(1) {
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/* open fifo for reading */
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debug_printf("opening\n");
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pipe_fd = open(FIFO_NAME, O_RDONLY);
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if(pipe_fd == -1) {
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debug_printf("open failed: %s\n", strerror(errno));
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return 1;
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}
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/* read until an error or reboot */
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while(1) {
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/* reset the buffer to prevent matching multiple times */
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memset(buf,0,MAX_BUF);
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/* blocking read from fifo */
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debug_printf("about to read\n");
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read_count = read(pipe_fd,buf,MAX_BUF-1);
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if(read_count <= 0) {
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debug_printf("read failed: %s\n", strerror(errno));
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break;
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}
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debug_printf("read: read_count %d, read: %s\n",read_count,buf);
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/* if read REBOOT_STR, then call reboot
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if read EDL_REBOOT_STR, then call edl-reboot */
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if(strncmp(buf,REBOOT_STR,strlen(REBOOT_STR)) == 0) {
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debug_printf("going for reboot\n");
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printf("reboot-daemon: initiating reboot\n");
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system("reboot");
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break;
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} else if(strncmp(buf,EDL_REBOOT_STR,strlen(EDL_REBOOT_STR)) == 0) {
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debug_printf("going for edl-reboot\n");
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printf("reboot-daemon: initiating edl-reboot\n");
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system("sys_reboot edl");
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break;
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}
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}
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/* close FIFO */
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debug_printf("closing fifo\n");
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close(pipe_fd);
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}
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}
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