int
main (int argc, char *argv[])
{
const char *progname;
char *output_filename;
FILE *peer_file = NULL, *output = NULL;
int sock = -1, peer, err;
struct sockaddr_in addr, peer_addr;
struct hostent *hostinfo;
socklen_t peer_addr_len;
int reuse;
int background;
int ret = 0;
progname = argv[0];
background = 0;
for (; argc >= 2; argc--, argv++) {
if (argv[1][0] != '-')
break;
if (strcmp (argv[1], "--") == 0) {
argc--;
argv++;
break;
}
if (strcmp (argv[1], "--background") == 0) {
background = 1;
continue;
}
fprintf (stderr, "%s: unregognized option '%s'\n",
progname, argv[1]);
return 1;
}
if (argc != 2) {
fprintf (stderr,
"Usage: %s [--background] <output-file>\n", progname);
return 1;
}
output_filename = argv[1];
output = fopen (output_filename, "w");
if (output == NULL) {
fprintf (stderr, "Failed to open %s for writing: %s\n",
output_filename, strerror (errno));
ret = 1;
goto DONE;
}
sock = socket (AF_INET, SOCK_STREAM, 0);
if (sock == -1) {
fprintf (stderr, "Error: socket() failed: %s\n",
strerror (errno));
ret = 1;
goto DONE;
}
reuse = 1;
err = setsockopt (sock, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof (reuse));
if (err) {
fprintf (stderr, "Error: setsockopt() failed: %s\n",
strerror (errno));
ret = 1;
goto DONE;
}
hostinfo = gethostbyname ("localhost");
if (hostinfo == NULL) {
fprintf (stderr, "Unknown host: localhost\n");
ret = 1;
goto DONE;
}
memset (&addr, 0, sizeof (addr));
addr.sin_family = AF_INET;
addr.sin_port = htons (25025);
addr.sin_addr = *(struct in_addr *) hostinfo->h_addr;
err = bind (sock, (struct sockaddr *) &addr, sizeof (addr));
if (err) {
fprintf (stderr, "Error: bind() failed: %s\n",
strerror (errno));
close (sock);
ret = 1;
goto DONE;
}
err = listen (sock, 1);
if (err) {
fprintf (stderr, "Error: listen() failed: %s\n",
strerror (errno));
close (sock);
ret = 1;
goto DONE;
}
if (background) {
int pid = fork ();
if (pid > 0) {
printf ("smtp_dummy_pid='%d'\n", pid);
fflush (stdout);
close (sock);
ret = 0;
goto DONE;
}
if (pid < 0) {
fprintf (stderr, "Error: fork() failed: %s\n",
strerror (errno));
close (sock);
ret = 1;
goto DONE;
}
/* Reached if pid == 0 (the child process). */
/* Close stdout so that the one interested in pid value will
* also get EOF. */
close (STDOUT_FILENO);
/* dup2() will re-reserve fd of stdout (1) (opportunistically),
* in case fd of stderr (2) is open. If that was not open we
* don't care fd of stdout (1) either. */
dup2 (STDERR_FILENO, STDOUT_FILENO);
/* This process is now out of reach of shell's job control.
* To resolve the rare but possible condition where this
* "daemon" is started but never connected this process will
* (only) have 30 seconds to exist. */
alarm (30);
}
peer_addr_len = sizeof (peer_addr);
peer = accept (sock, (struct sockaddr *) &peer_addr, &peer_addr_len);
if (peer == -1) {
fprintf (stderr, "Error: accept() failed: %s\n",
strerror (errno));
ret = 1;
goto DONE;
}
peer_file = fdopen (peer, "w+");
if (peer_file == NULL) {
fprintf (stderr, "Error: fdopen() failed: %s\n",
strerror (errno));
ret = 1;
goto DONE;
}
do_smtp_to_file (peer_file, output);
DONE:
if (output)
fclose (output);
if (peer_file)
fclose (peer_file);
if (sock >= 0)
close (sock);
return ret;
}
int
main (int argc, char *argv[])
{
char *output_filename;
FILE *peer_file, *output;
int sock, peer, err;
struct sockaddr_in addr, peer_addr;
struct hostent *hostinfo;
socklen_t peer_addr_len;
int reuse;
if (argc != 2) {
fprintf (stderr, "Usage: %s <output-file>\n", argv[0]);
exit (1);
}
output_filename = argv[1];
output = fopen (output_filename, "w");
if (output == NULL) {
fprintf (stderr, "Failed to open %s for writing: %s\n",
output_filename, strerror (errno));
exit (1);
}
sock = socket (AF_INET, SOCK_STREAM, 0);
if (sock == -1) {
fprintf (stderr, "Error: socket() failed: %s\n",
strerror (errno));
exit (1);
}
reuse = 1;
err = setsockopt (sock, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof (reuse));
if (err) {
fprintf (stderr, "Error: setsockopt() failed: %s\n",
strerror (errno));
exit (1);
}
hostinfo = gethostbyname ("localhost");
if (hostinfo == NULL) {
fprintf (stderr, "Unknown host: localhost\n");
exit (1);
}
addr.sin_family = AF_INET;
addr.sin_port = htons (25025);
addr.sin_addr = *(struct in_addr *) hostinfo->h_addr;
err = bind (sock, (struct sockaddr *) &addr, sizeof(addr));
if (err) {
fprintf (stderr, "Error: bind() failed: %s\n",
strerror (errno));
close (sock);
exit (1);
}
err = listen (sock, 1);
if (err) {
fprintf (stderr, "Error: listen() failed: %s\n",
strerror (errno));
close (sock);
exit (1);
}
peer_addr_len = sizeof (peer_addr);
peer = accept (sock, (struct sockaddr *) &peer_addr, &peer_addr_len);
if (peer == -1) {
fprintf (stderr, "Error: accept() failed: %s\n",
strerror (errno));
exit (1);
}
peer_file = fdopen (peer, "w+");
if (peer_file == NULL) {
fprintf (stderr, "Error: fdopen() failed: %s\n",
strerror (errno));
return;
}
do_smtp_to_file (peer_file, output);
fclose (output);
fclose (peer_file);
close (sock);
return 0;
}
