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/*
** Copyright 2002-2006 Double Precision, Inc. See COPYING for
** distribution information.
*/
#include "config.h"
#include "liblock.h"
#include "mail.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/stat.h>
#if HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifndef WEXITSTATUS
#define WEXITSTATUS(stat_val) ((unsigned)(stat_val) >> 8)
#endif
#ifndef WIFEXITED
#define WIFEXITED(stat_val) (((stat_val) & 255) == 0)
#endif
#if HAVE_SYSEXITS_H
#include <sysexits.h>
#endif
#ifndef EX_TEMPFAIL
#define EX_TEMPFAIL 75
#endif
#define NTRIES_DEFAULT 60
#define DELAY 5
static int sig=0;
static int catch(int signum)
{
sig=1;
signal(SIGHUP, (void (*)(int))catch);
signal(SIGTERM, (void (*)(int))catch);
signal(SIGINT, (void (*)(int))catch);
return 0;
}
static int caught()
{
signal(SIGHUP, SIG_DFL);
signal(SIGTERM, SIG_DFL);
signal(SIGINT, SIG_DFL);
return sig;
}
int main(int argc, char **argv)
{
char **argvec;
int n;
int fd;
pid_t pid, pid2;
int waitstat;
struct ll_mail *p;
int ntries=NTRIES_DEFAULT;
int readonly=0;
int optchar;
while ((optchar=getopt(argc, argv, "+rt:")) != -1)
switch (optchar) {
case 'r':
readonly=1;
break;
case 't':
ntries=atoi(optarg);
if (ntries < 0)
{
fprintf(stderr, "%s: invalid argument to -t\n",
argv[0]);
exit(EX_TEMPFAIL);
}
ntries= (ntries / DELAY) + 1;
break;
default:
exit(1);
}
if (argc - optind < 2)
{
fprintf(stderr, "Usage: %s [-r] [-t time] mailfile program [args]...\n",
argv[0]);
exit(1);
}
if ((argvec=malloc(sizeof(char *) * (argc - optind + 1))) == NULL)
{
perror("malloc");
exit (1);
}
for (n=optind+1; n<argc; n++)
argvec[n-optind - 1]=argv[n];
argvec[n-optind-1]=NULL;
/* Create the mail file, if it doesn't exist */
if ((n=open(argv[optind], O_RDWR|O_CREAT, 0600)) >= 0)
close(n);
signal(SIGUSR2, SIG_IGN);
signal(SIGCHLD, SIG_DFL);
p=NULL;
for (n=0; n<ntries; sleep(DELAY), n++)
{
if (p)
ll_mail_free(p);
if ((p=ll_mail_alloc(argv[optind])) == NULL)
{
perror("malloc");
exit(1);
}
signal(SIGHUP, (void (*)(int))catch);
signal(SIGTERM, (void (*)(int))catch);
signal(SIGINT, (void (*)(int))catch);
if (ll_mail_lock(p) < 0)
{
if (errno == ENOENT)
break; /* Mail file gone? */
if (caught())
break;
continue;
}
if ((fd=ll_mail_open(p)) < 0)
{
if (!readonly || (fd=ll_mail_open_ro(p)) < 0)
{
if (caught())
break;
continue;
}
}
if ((pid=fork()) < 0)
{
perror("fork");
exit(1);
}
if (pid == 0)
{
if (setgid(getgid()) < 0 ||
setuid(getuid()) < 0)
{
perror("setuid/setgid");
exit(1);
}
(void)caught();
execvp(argvec[0], argvec);
perror(argvec[0]);
exit(1);
}
while ((pid2=wait(&waitstat)) != pid)
;
ll_mail_free(p);
if (WIFEXITED(waitstat))
exit(WEXITSTATUS(waitstat));
exit(EX_TEMPFAIL);
}
if (p)
ll_mail_free(p);
exit(EX_TEMPFAIL);
return (0);
}
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