142 lines
3.7 KiB
C
142 lines
3.7 KiB
C
/*
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* cinit
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* (c) 2005 Nico Schottelius (nico-linux at schottelius.org)
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* handle client requests
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*/
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#include <sys/wait.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <stdio.h>
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#include <errno.h>
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#include <unistd.h>
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#include <limits.h>
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#include <signal.h>
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#include "cinit.h"
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/***********************************************************************
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* sigio: client handling
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*/
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/* we are called, if one or _more_ connections are waiting */
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void sigio(int socket)
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{
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int tmp, nsock;
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char buf[PATH_MAX+1], status;
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struct listitem *list_tmp;
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pid_t pid;
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while (
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(nsock = accept(socket,(struct sockaddr *) NULL, (socklen_t *) NULL) )
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!= -1) {
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if( read(nsock,&buf[0],1) == -1) {
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perror(MSG_ERR_READ);
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close(nsock);
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continue;
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}
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switch(buf[0]) {
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/********************** START SERVICE *******************/
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case CMD_START_SVC:
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tmp = do_svc_name(nsock,buf,ACT_SERV);
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if(!tmp) break;
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buf[tmp] = 0;
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list_tmp = list_search(buf);
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if(list_tmp != NULL) { /* service already exists, return status */
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status = list_tmp->status;
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do_result(nsock,&status);
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break;
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}
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tmp = list_insert(buf,ST_TMP); /* add service */
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if(!tmp) { /* failed */
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LOG(MSG_ERR_ADD_SVC);
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status = ST_FAIL;
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} else {
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status = RT_TMPNOW;
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}
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do_result(nsock,&status);
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break;
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/********************** STOP (RESPAWNING) *******************/
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case CMD_STOP_SVC:
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tmp = do_svc_name(nsock,buf,ACT_SERV);
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if(!tmp) break;
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buf[tmp] = 0;
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list_tmp = list_search(buf);
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/* FIXME:
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- handle off
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- handle switching off once services
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- perhaps remove old cinit code, which has respawing childs
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*/
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if(list_tmp != NULL) { /* service exists */
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if(list_tmp->status == ST_RESPAWN) {
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/* kill cinit watcher, which kills the real process */
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kill(list_tmp->pid,SIGTERM);
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/* wait for watcher to terminate */
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waitpid(list_tmp->pid,&tmp,0);
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}
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status = ST_OFF;
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if(!list_modify(buf,status,list_tmp->pid)) {
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status = ST_FAIL;
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} else { /* return status */
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status = list_tmp->status;
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}
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} else { /* no service there */
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status = RT_NOTEXIST;
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}
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do_result(nsock,&status);
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break;
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/********************** CHANGE SERVICE STATUS *******************/
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case CMD_CHG_STATUS:
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tmp = do_change_status(buf,&status,&pid,nsock,ACT_SERV);
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if(!tmp) break;
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buf[tmp] = 0; /* terminate buf */
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if(!list_modify(buf,status,pid)) {
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SERVICE_LOG(buf,MSG_ERR_MODIFY);
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status = 0;
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}
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do_result(nsock,&status);
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break;
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/********************** SPECIAL ACTIONS *******************/
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case CMD_REBOOT:
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sig_reboot(SIGHUP);
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break;
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case CMD_POWEROFF:
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sig_reboot(SIGTERM);
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break;
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case CMD_HALT:
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sig_reboot(SIGUSR1);
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break;
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case CMD_RESCUE:
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sig_reboot(SIGUSR2);
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break;
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case CMD_UPDATE:
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sig_reboot(SIGCONT);
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break;
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default:
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LOG(MSG_CMD_UNKNOWN);
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break;
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}
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close(nsock);
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}
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/* hier kommt man haeufiger herein, interrupted system call */
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if( errno != EAGAIN && errno != EINTR) { /* report, but don't panic */
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perror(MSG_ERR_ACCEPT);
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}
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}
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