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#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/poll.h>
#include <sys/wait.h>
#include <popt.h>
#include "initlog.h"
#include "process.h"
int forkCommand(char **args, int *outfd, int *errfd, int *cmdfd, int quiet) {
/* Fork command 'cmd', returning pid, and optionally pointer
* to open file descriptor fd */
int fdin, fdout, fderr, fdcmd, pid;
int outpipe[2], errpipe[2], fdpipe[2];
if ( (pipe(outpipe)==-1) || (pipe(errpipe)==-1) || (pipe(fdpipe)==-1) ) {
perror("pipe");
return -1;
}
dup2(0,fdin);
if (outfd) {
fdout = outpipe[1];
*outfd = outpipe[0];
} else {
if (!quiet)
dup2(1,fdout);
}
if (errfd) {
fderr = errpipe[1];
*errfd = errpipe[0];
} else {
if (!quiet)
dup2(2,fderr);
}
fdcmd = fdpipe[1];
if (cmdfd)
*cmdfd = fdpipe[0];
if ((pid = fork())==-1) {
perror("fork");
return -1;
}
if (pid) {
/* parent */
close(fdin);
close(fdout);
close(fderr);
close(fdcmd);
return pid;
} else {
/* kid */
if (outfd) {
if ( (dup2(fdout,1)==-1) ) {
perror("dup2");
exit(-1);
}
} else if (quiet)
if ((dup2(open("/dev/null",O_WRONLY),1))==-1) {
perror("dup2");
exit(-1);
}
if (errfd) {
if ((dup2(fderr,2)==-1)) {
perror("dup2");
exit(-1);
}
} else if (quiet)
if ((dup2(open("/dev/null",O_WRONLY),2))==-1) {
perror("dup2");
exit(-1);
}
if ((dup2(fdcmd,CMD_FD)==-1)) {
perror("dup2");
exit(-1);
}
close(fdout);
close(fderr);
close(fdcmd);
if (outfd)
close(*outfd);
if (errfd)
close(*errfd);
if (cmdfd)
close(*cmdfd);
execvp(args[0],args);
perror("execvp");
exit(-1);
}
}
int monitor(char *cmdname, int pid, int numfds, int *fds, int reexec, int quiet) {
struct pollfd *pfds;
char *buf=malloc(2048*sizeof(char));
int outpipe[2];
char *tmpstr=NULL;
int x,y,rc=-1;
int done=0;
int output=0;
pipe(outpipe);
pfds = malloc(numfds*sizeof(struct pollfd));
for (x=0;x<numfds;x++) {
pfds[x].fd = fds[x];
pfds[x].events = POLLIN | POLLPRI;
}
while (!done) {
if (((x=poll(pfds,numfds,500))==-1)&&errno!=EINTR) {
perror("poll");
return -1;
}
if (waitpid(pid,&rc,WNOHANG))
done=1;
y=0;
while (y<numfds) {
if ( x && ((pfds[y].revents & (POLLIN | POLLPRI)) )) {
int bytesread = 0;
do {
buf=calloc(2048,sizeof(char));
bytesread = read(pfds[y].fd,buf,2048);
if (bytesread==-1) {
perror("read");
return -1;
}
if (bytesread) {
if (!quiet && !reexec)
write(1,buf,bytesread);
if (quiet) {
output = 1;
write(outpipe[1],buf,bytesread);
}
while ((tmpstr=getLine(&buf))) {
if (!reexec)
logString(cmdname,tmpstr);
else {
char **cmdargs=NULL;
char **tmpargs=NULL;
int cmdargc,x;
poptParseArgvString(tmpstr,&cmdargc,&tmpargs);
cmdargs=malloc( (cmdargc++) * sizeof(char *) );
cmdargs[0]=strdup("initlog");
for (x=0;x<(cmdargc-1);x++) {
cmdargs[x+1]=tmpargs[x];
}
processArgs(cmdargc,cmdargs);
}
}
}
} while ( bytesread==2048 );
}
y++;
}
}
if ((!WIFEXITED(rc)) || (rc=WEXITSTATUS(rc))) {
/* If there was an error and we're quiet, be loud */
int x;
if (quiet && output) {
buf=calloc(2048,sizeof(char));
do {
x=read(outpipe[0],buf,2048);
write(1,"\n",1);
write(1,buf,x);
buf=calloc(2048,sizeof(char));
} while (x==2048);
}
return (rc);
}
return 0;
}
int runCommand(char *cmd, int reexec, int quiet) {
int fds[2];
int pid,x;
char **args, **tmpargs;
char *cmdname;
poptParseArgvString(cmd,&x,&tmpargs);
args = malloc((x+1)*sizeof(char *));
for ( pid = 0; pid < x ; pid++) {
args[pid] = strdup(tmpargs[pid]);
}
args[pid] = NULL;
if (strcmp(args[0],"sh") && strcmp(args[0],"/bin/sh"))
cmdname = basename(args[0]);
else
cmdname = basename(args[1]);
if ((cmdname[0] =='K' || cmdname[0] == 'S') && ( 30 <= cmdname[1] <= 39 )
&& ( 30 <= cmdname[2] <= 39 ) )
cmdname+=3;
if (!reexec) {
pid=forkCommand(args,&fds[0],&fds[1],NULL,quiet);
x=monitor(cmdname,pid,2,fds,reexec,quiet);
} else {
setenv("IN_INITLOG","yes",1);
pid=forkCommand(args,NULL,NULL,&fds[0],quiet);
unsetenv("IN_INITLOG");
x=monitor(cmdname,pid,1,&fds[0],reexec,quiet);
}
return x;
}
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