petidomo/listserv.c

/*
   $Source$
   $Revision$

   Copyright (C) 2000 by CyberSolutions GmbH, Germany.

   This file is part of Petidomo.

   Petidomo is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   Petidomo is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
   General Public License for more details.
*/

#include <string.h>
#include <ctype.h>

#include "libtext/text.h"
#include "petidomo.h"

char * g_currLine;		/* pointer to the line currently parsed */

int
listserv_main(char * incoming_mail, char * default_list)
{
    const struct List_Config * ListConfig;
    struct Mail *   MailStruct;
    char *          nextLine;
    char *          parameter;
    char            param1[512], param2[512];
    char            keyword[32];
    int             j, i, junklines, rc, found, operator;

    /* Initialize internals. */

    if (default_list != NULL)
      ListConfig = getListConfig(default_list);
    else
      ListConfig = NULL;

    /* Parse the incoming mail. */

    rc = ParseMail(&MailStruct, incoming_mail,
		   (ListConfig != NULL) ? ListConfig->fqdn : NULL);
    if (rc != 0) {
	syslog(LOG_ERR, "Parsing the incoming mail failed.");
	exit(rc);
    }

    /* Do sanity checks. */

    if (MailStruct->Envelope == NULL) {
	syslog(LOG_NOTICE, "Received mail without a valid envelope.");
	return 0;
    }
    if (MailStruct->From == NULL) {
        syslog(LOG_NOTICE, "Received mail without From: line.");
        return 0;
    }

    /* Do access control. */

    if (checkACL(MailStruct, NULL, &operator, &parameter) != 0) {
	syslog(LOG_ERR, "checkACL() failed with an error.");
	exit(1);
    }
    rc = handleACL(MailStruct, NULL, operator, parameter);
    switch(rc) {
      case -1:
	  syslog(LOG_ERR, "handleACL() failed with an error.");
	  exit(1);
      case 0:
	  break;
      case 1:
	  return 0;
    }

    /* Parse the body and call the apropriate routines for each
       command. */

    g_currLine = MailStruct->Body;
    if (*g_currLine == '\0') {
	syslog(LOG_NOTICE, "Received mail with empty body.");
	SendHelp(MailStruct, NULL, NULL, default_list);
	return 0;
    }
    for (nextLine = text_find_next_line(g_currLine), junklines = 0, found = 0;
	 *g_currLine != '\0' && junklines <= 7;
	 g_currLine = nextLine, nextLine = text_find_next_line(g_currLine)) {

	/* remove trailing \n */

	if (nextLine[-1] == '\n')
	  nextLine[-1] = '\0';

	/* Skip comments, signature and empty lines. */

	if (*g_currLine == '\0' || *g_currLine == '#')
	    continue;
	if (!strcmp(g_currLine, "-- "))
	    break;

	/* Log contents of current line. */

	syslog(LOG_INFO, "%s: %s",
	    ((MailStruct->Reply_To) ? MailStruct->Reply_To : MailStruct->From), g_currLine);

	/* Check whether we have a routine for that command. */

	for (j = 0; !isspace((int)g_currLine[j]) && j < (sizeof(keyword)-1); j++)
	  keyword[j] = g_currLine[j];
	keyword[j] = '\0';
	for (i = 0; (&(ParseArray[i]))->keyword != NULL; i++) {
	    if (strcasecmp(keyword, (&(ParseArray[i]))->keyword) == 0) { /* hit */
		rc = sscanf(g_currLine, "%*s%511s%511s", param1, param2);
		rc = ((&(ParseArray[i]))->handleCommand)(MailStruct,
							 ((rc >= 1) ? param1 : NULL),
							 ((rc == 2) ? param2 : NULL),
							 default_list);
		if (rc != 0) {
		    syslog(LOG_ERR, "Error occured while handling command.");
		    exit(1);
		}
		found++;
		break;
	    }
	}

	if ((&(ParseArray[i]))->keyword == NULL) {

	    /* No valid command. */

	    junklines++;
	}
    }

    if (junklines > 7)
      syslog(LOG_INFO, "Too many junk lines, ignoring rest of the mail.");

    if (found == 0) {
	syslog(LOG_INFO, "No valid command found, sending help file back to \"%s\".",
	    ((MailStruct->Reply_To) ? MailStruct->Reply_To : MailStruct->From));
	Indecipherable(MailStruct, default_list);
    }

    return 0;
}