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/* A little hacked up program that allows a script to play the part of a remote
SMTP/LMTP server on stdin/stdout for testing purposes. Hacked from the more
complicated version that does it over a socket. */
/* ANSI C standard includes */
#include <ctype.h>
#include <signal.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
/* Unix includes */
#include <errno.h>
#include <unistd.h>
static FILE *log;
/*************************************************
* SIGALRM handler - crash out *
*************************************************/
static void
sigalrm_handler(int sig)
{
sig = sig; /* Keep picky compilers happy */
fprintf(log, "Server timed out\n");
exit(99);
}
/*************************************************
* Main Program *
*************************************************/
int main(int argc, char **argv)
{
char *logfile;
char *logmode = "w";
FILE *script;
unsigned char sbuffer[1024];
unsigned char ibuffer[1024];
if (argc < 3)
{
fprintf(stdout, "500 Script and log file required\n");
exit(1);
}
/* Get the script and log open */
script = fopen(argv[1], "r");
if (script == NULL)
{
fprintf(stdout, "500 Failed to open script %s: %s\r\n", argv[1],
strerror(errno));
exit(1);
}
logfile = argv[2];
if (logfile[0] == '+')
{
logfile++;
logmode = "a";
}
log = fopen(logfile, logmode);
if (log == NULL)
{
fprintf(stdout, "500 Failed to open log %s: %s\r\n", logfile,
strerror(errno));
exit(1);
}
/* SIGALRM handler crashes out */
signal(SIGALRM, sigalrm_handler);
/* Read the script, and do what it says. */
while (fgets(sbuffer, sizeof(sbuffer), script) != NULL)
{
int n = (int)strlen(sbuffer);
while (n > 0 && isspace(sbuffer[n-1])) n--;
sbuffer[n] = 0;
/* If the script line starts with a digit, it is a response line which
we are to send. */
if (isdigit(sbuffer[0]))
{
fprintf(log, "%s\n", sbuffer);
fflush(log);
fprintf(stdout, "%s\r\n", sbuffer);
fflush(stdout);
}
/* If the script line starts with "*sleep" we just sleep for a while
before continuing. Do not write this to the log, as it may not get
written at the right place in a log that's being shared. */
else if (strncmp(sbuffer, "*sleep ", 7) == 0)
{
sleep(atoi(sbuffer+7));
}
/* Otherwise the script line is the start of an input line we are expecting
from the client, or "*eof" indicating we expect the client to close the
connection. Read command line or data lines; the latter are indicated
by the expected line being just ".". */
else
{
int data = strcmp(sbuffer, ".") == 0;
fprintf(log, "%s\n", sbuffer);
fflush(log);
/* Loop for multiple data lines */
for (;;)
{
int n;
alarm(5);
if (fgets(ibuffer, sizeof(ibuffer), stdin) == NULL)
{
fprintf(log, "%sxpected EOF read from client\n",
(strncmp(sbuffer, "*eof", 4) == 0)? "E" : "Une");
goto END_OFF;
}
alarm(0);
n = (int)strlen(ibuffer);
while (n > 0 && isspace(ibuffer[n-1])) n--;
ibuffer[n] = 0;
fprintf(log, "<<< %s\n", ibuffer);
if (!data || strcmp(ibuffer, ".") == 0) break;
}
/* Check received what was expected */
if (strncmp(sbuffer, ibuffer, (int)strlen(sbuffer)) != 0)
{
fprintf(log, "Comparison failed - bailing out\n");
goto END_OFF;
}
}
}
/* This could appear in the wrong place in a shared log, so forgo it. */
/* fprintf(log, "End of script\n"); */
END_OFF:
fclose(script);
fclose(log);
exit(0);
}
/* End of mtpscript.c */
|
