305 lines
8.1 KiB
Text
305 lines
8.1 KiB
Text
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/*
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* (c) 2005 Nico Schottelius (nico-linux at schottelius.org)
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* run_svc
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* part of cinit
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*/
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <string.h>
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#include <fcntl.h>
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#include <sys/wait.h>
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#include <limits.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <dirent.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 <fcntl.h>
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#include <errno.h>
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#include "cinit.h"
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/* run a service, gets (relative or absolute) path */
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int run_svc(char *rpath)
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{
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int tmp=0, respawn = 0, status, fd, cnt, sid;
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int p_com[2]; /* talk to respawnig watcher */
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char pathbuf[PATH_MAX], pathtmp[PATH_MAX]; /* pathtmp = use-it-for-all bitch*/
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char **nargv, *sbuf, *p; /* the argv for the executed process */
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struct stat buf;
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pid_t pid;
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struct sockaddr_un addr;
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D_PRINTF("starte run_svc");
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D_PRINTF(rpath);
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/******************* begin socket *********************/
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/* close old socket connection */
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D_PRINTF("beginne socket zeugs");
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close(sock);
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sock = socket(PF_UNIX,SOCK_STREAM,0);
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if( sock == -1 ) {
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perror("socket");
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_exit(1);
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}
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memset(&addr,0,sizeof(addr));
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strcpy(addr.sun_path, CINIT_SOCK);
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addr.sun_family = AF_UNIX;
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tmp = sizeof(addr);
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if(setsockopt(sock, SOL_SOCKET, SO_PASSCRED, &tmp, sizeof(tmp)) == -1) {
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perror("passcred");
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cerr("Does your OS not support SO_PASSCRED (man 7 socket)?",RT_PAR_FAIL);
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}
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if(connect(sock,(struct sockaddr *)&addr,tmp) == -1) {
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perror("connect");
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_exit(1);
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}
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/******************* end socket *********************/
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/* check whether service exists */
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if( stat(rpath,&buf) ) {
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printf("Service does not exist %s\n",rpath);
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_exit(1);
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} else if( ! S_ISDIR(buf.st_mode) ) {
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printf("Service is not a dir (%s)!\n",rpath);
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_exit(1);
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}
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tmp = msg_start_svc(rpath); /* now we are temporary */
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D_PRINTF("in runsvc");
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if(tmp == -1) {
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cerr("cinit returned start error",RT_CHLD_FAIL);
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_exit(1);
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}
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/* check, whether we should respawn */
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strcpy(pathtmp,pathbuf);
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strcat(pathtmp,"/");
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strcat(pathtmp,C_RESPAWN); /* FIXME: check return values */
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if( stat(pathtmp,&buf) == 0) {
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D_PRINTF("Respawn, ja das werden wir tun");
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respawn = 1;
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}
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/* if respawn, we have to create a pipe to talk with child */
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if(respawn) {
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if ( pipe(p_com) == -1 ) {
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perror("pipe");
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cerr("pipe failed",RT_PAR_FAIL);
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}
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}
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pid = fork();
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/* pay attention: we are also a fork()! */
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if( pid == -1 ) {
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perror("fork");
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cerr("fork failed",RT_CHLD_FAIL);
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_exit(1);
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}
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_exit(0);
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/* the following block handles parent situation */
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if(pid > 0) { /* parent gets child's PID */
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/* FIXME: when respawing, we'll watch our child */
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if(respawn) {
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tmp = MSG_FAIL;
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read(p_com[0],&tmp,1); /* FIXME: check return */
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if(tmp == MSG_OK) {
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D_PRINTF("kind sagte, wir respawnenen jetzt\n");
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add_mod_svc(rpath,ST_RESPAWN); /* FIXME: search bei sid! */
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return RT_PAR_OK;
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} else { /* child failed */
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printf("kind sagte, respawn kaputt\n");
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add_mod_svc(rpath,ST_FAIL); /* FIXME: search bei sid! */
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return RT_PAR_FAIL;
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}
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} else /* don't RESPAWN */ { /* execute only once */
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D_PRINTF("Warte EINMAL auf mein Kind...");
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waitpid(pid, &status, 0);
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if(WIFEXITED(status)) {
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add_mod_svc(rpath,ST_ONCE); /* FIXME: search bei sid! */
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return RT_PAR_OK;
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} else {
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add_mod_svc(rpath,ST_FAIL); /* FIXME: search bei sid! */
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return RT_PAR_FAIL;
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}
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}
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}
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/* done till here. PARENTS EXECUTION ENDED! */
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/*********** CHILD EXECUTION HERE ***********/
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/* change to service dir */
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if( chdir(rpath) == -1) {
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printf("chdir(%s) failed!\n",rpath);
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return 1;
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}
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/* getcwd returns the full service name */
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if(getcwd(pathbuf,PATH_MAX) == NULL) return 0;
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printf("absolut and current %s\n",pathbuf);
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/* check for needs */
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/* CHECKME: do we need absolute paths anymore? */
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// strcpy(pathbuf,rpath);
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// strcat(pathbuf,"/");
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strcpy(pathtmp,C_NEEDS);
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if( ! stat(pathtmp,&buf) ) {
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printf("going for %s\n",pathtmp);
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if( run_run_svcs(pathtmp) != RT_ALL_STARTED ) {
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cerr("couldn't start all services I depend on\n",RT_CHLD_FAIL);
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}
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}
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/* check for wants -> forked() ? */
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// strcpy(pathbuf,rpath);
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// strcat(pathbuf,"/");
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strcpy(pathtmp,C_WANTS);
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if( ! stat(pathtmp,&buf) ) {
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printf("dir gibt es auch: %s\n", pathtmp);
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run_run_svcs(pathtmp); /* don't care if everything went well */
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}
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/* everything is started, now start ourselves! */
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/**** RETRIEVE REAL BINARY NAME ****/
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/* .../run */
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// strcpy(pathtmp,pathbuf);
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// strcat(pathtmp,"/");
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// strcpy(pathtmp,C_RUN); /* FIXME: check return values */
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/* readlink retrieves real name, if "./run" is a symlink */
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if ( (tmp = readlink(C_RUN,pathtmp,PATH_MAX) ) == -1) {
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if (errno != EINVAL) cerr("readlinx failed\n",RT_CHLD_FAIL);
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/* binary is not a link, copy that to argv0 */
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sbuf = (char *) malloc( strlen(pathbuf) + strlen(C_RUN) + 1 );
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if(sbuf == NULL) cerr("malloc failed\n",RT_CHLD_FAIL);
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strcpy(sbuf,pathbuf);
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strcat(pathtmp,"/");
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strcat(pathtmp,C_RUN); /* FIXME: check return values */
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} else { /* it's a link, copy to sbuf */
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sbuf = (char *) malloc( tmp + 1 );
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if(sbuf == NULL) cerr("malloc failed\n",RT_CHLD_FAIL);
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strncpy(sbuf,pathtmp,tmp);
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sbuf[tmp] = '\0';
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}
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printf("argv0: %s\n",sbuf);
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/**** BUILD ARGV ****/
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/* STOPPPPPPPED **********
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broken code: malloc of char* missing! */
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nargv = malloc( sizeof(char *) );
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if(nargv == NULL) cerr("malloc failed\n",RT_CHLD_FAIL);
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nargv[0] = sbuf;
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/**** read params ****/
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strcpy(pathtmp,pathbuf);
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strcat(pathtmp,"/");
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strcat(pathtmp,C_PARAMS);
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if( !stat(pathtmp,&buf) ) {
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fd = open(pathtmp,O_RDONLY);
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if(fd == -1) cerr("open params failed\n",RT_CHLD_FAIL);
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sbuf = NULL;
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cnt = 0;
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/* most likely one round */
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while ( (tmp = read(fd,pathtmp,PATH_MAX-1) ) != 0 ) {
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if(tmp == -1) cerr("read params failed\n",RT_CHLD_FAIL);
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/* STRCHR >> tmp ???? */
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/* terminate for strchr - do we really need that? */
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pathtmp[PATH_MAX-1] = '\0';
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sbuf = realloc(sbuf,cnt + tmp + 1);
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if(sbuf == NULL) cerr("realloc failed\n",RT_CHLD_FAIL);
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/* copy to temporary buffer */
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strncpy(&sbuf[cnt],pathtmp,tmp);
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cnt += tmp;
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printf("Groesse: %d (%d)\n",tmp,cnt+1);
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}
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close(fd);
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} /* if params */
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sbuf[cnt] = '\0';
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/* build argv, now really */
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/* use the allocated buffer and replace \n with \0 ;-) */
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cnt = 1;
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// p = sbuf;
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while ( *sbuf != '\0' ) {
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p = strchr(sbuf,'\n'); /* set p to next \n */
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nargv = realloc(nargv,(cnt+1) * sizeof(char *) );
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if(nargv == NULL) cerr("malloc failed\n",RT_CHLD_FAIL);
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// nargv[cnt] = malloc( sizeof(char *) );
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// if(nargv[cnt] == NULL) cerr("malloc failed\n",RT_CHLD_FAIL);
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nargv[cnt] = sbuf; /* beginning of argv[cnt] */
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*p = '\0'; /* end argv[cnt] */
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tmp = p - sbuf;
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printf("argv[%d]: %s (%d)\n",cnt,nargv[cnt],tmp);
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sbuf = p+1;
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cnt++;
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}
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/* GNAAAAAAAAAA: correct???? */
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/* close argv list */
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nargv[cnt] = malloc( sizeof(char *) );
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if(nargv[cnt] == NULL) cerr("malloc failed\n",RT_CHLD_FAIL);
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nargv[cnt] = NULL;
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// char *strchr(const char *s, int c);
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/* end buffer */
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/* get size of argv[n] */
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/* run the fscking service */
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strcpy(pathtmp,pathbuf);
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strcat(pathtmp,"/");
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strcat(pathtmp,C_RUN);
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printf("Service starten: %s \n", pathtmp);
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/* nothing to run, so it's finished */
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if( stat(pathtmp,&buf) ) _exit(0);
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//execl(pathtmp,pathtmp,"/bin/ls","-l", "/bin/echo");
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execv(pathtmp,nargv);
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// _exit(1);
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/*
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if(respawn)
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tmp = 0;
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execl();
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return 1;
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*/
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}
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