/*:ts=8*/
/*****************************************************************************
 * FIDOGATE --- Gateway UNIX Mail/News <-> FTN NetMail/EchoMail
 *
 * $Id: ftn2ftn.c,v 4.2 1996/12/17 17:19:57 mj Exp $
 *
 * FTN-FTN gateway for NetMail, using the %Z:N/F.P addressing in the
 * from/to fields.
 *****************************************************************************
 * Copyright (C) 1990-1997
 *  _____ _____
 * |     |___  |   Martin Junius             FIDO:      2:2452/110
 * | | | |   | |   Radiumstr. 18             Internet:  mj@fido.de
 * |_|_|_|@home|   D-51069 Koeln, Germany
 *
 * This file is part of FIDOGATE.
 *
 * FIDOGATE 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.
 *
 * FIDOGATE 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.
 * 
 * You should have received a copy of the GNU General Public License
 * along with FIDOGATE; see the file COPYING.  If not, write to the Free
 * Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *****************************************************************************/

#include "fidogate.h"
#include "getopt.h"


#define PROGRAM 	"ftn2ftn"
#define VERSION 	"$Revision: 4.2 $"
#define CONFIG		CONFIG_MAIN



/*
 * Prototypes
 */
void	add_via			(Textlist *, Node *);
int	do_message		(Node *, Message *, MsgBody *);
int	unpack			(Node *, FILE *, Packet *);
int	unpack_file		(Node *, char *);
int	do_outbound		(Node *, Node *);

void	short_usage		(void);
void	usage			(void);



static char *o_flag=NULL;	/* -o --out-packet-file option */



/*
 * Zone gate addresses
 */
Node gate_a;			/* FTN address in network A */
Node gate_b;			/* FTN address in network B */



/*
 * Add our ^AVia line
 */
void add_via(Textlist *list, Node *gate)
{
    tl_appendf(list, "\001Via FIDOGATE/%s %s, %s\r\n",
		     PROGRAM, node_to_asc(gate, FALSE),
		     date("%a %b %d %Y at %H:%M:%S %Z", NULL)  );
}



/*
 * Process one message for zone gate
 */
int do_message(Node *gate, Message *msg, MsgBody *body)
{
    static int last_zone = -1;
    static FILE *fp;
    char *from, *to;
    char *p;
    Node node;
    
    from = msg->name_from;
    to   = msg->name_to;
    
    debug(3, "Message to: %s", to);

    p = strrchr(to, '%');
    if(!p)
	p = strrchr(to, '@');

    /*
     * Check for EchoMail
     */
    if(body->area)
    {
	log("ftn2ftn: skipping EchoMail");
	return ERROR;
    }
    
    /*
     * Gateway addressing with "User Name%Z:N/F.P"
     * "User Name@Z:N/F.P" found. Get address and push
     * to the other side.
     */
    if( p && asc_to_node(p+1, &node, FALSE) == OK )
    {
	cf_set_zone(gate->zone);

	/* Add gate addresses to ^Via lines */
	add_via(&body->via, &msg->node_to);
	add_via(&body->via, gate);
	
	/* Strip % addressing */
	*p = 0;
	/* Add sender address to from name */
	strncpy0(buffer, "%", sizeof(buffer));
	strncat0(buffer, node_to_asc(&msg->node_from, FALSE), sizeof(buffer));
	if( strlen(from)+strlen(buffer) > MSG_MAXNAME-1 )
	    from[MSG_MAXNAME-1-strlen(buffer)] = 0;
	strncat0(from, buffer, MSG_MAXNAME);
	/* Readdress */
	msg->node_from = *gate;
	msg->node_to   = node;
    }
    /*
     * Local message, simply readdress to our main AKA
     */
    else 
    {
	cf_set_zone(msg->node_to.zone);

	/* Add gate addresses to ^Via lines */
	add_via(&body->via, &msg->node_to);

	/* Readdress */
	msg->node_to = cf_n_addr();
    }

    /*
     * Write this message to the output packet
     */
    if(!o_flag && cf_zone()!=last_zone)
	pkt_close();
    if(!pkt_isopen())
	if( (fp = pkt_open(o_flag, NULL, NULL, FALSE)) == NULL )
	    return ERROR;
    last_zone = cf_zone();
    
    msg->area = NULL;
    if( pkt_put_msg_hdr(fp, msg, TRUE) != OK )
	return ERROR;
    if( msg_put_msgbody(fp, body, TRUE) != OK )
	return ERROR;
    
    return OK;
}



/*
 * Unpack and process messages
 */
int unpack(Node *gate, FILE *pkt_file, Packet *pkt)
{
    Message msg;
    Textlist tl;
    MsgBody body;
    int type;

    tl_init(&tl);
    msg_body_init(&body);
    
    type = pkt_get_int16(pkt_file);
    while(type == MSG_TYPE)
    {
	msg.node_from = pkt->from;
	msg.node_to   = pkt->to;
	pkt_get_msg_hdr(pkt_file, &msg);
	
	type = pkt_get_body(pkt_file, &tl);
	if(type == ERROR)
	{
	    log("ftn2ftn: error reading input packet");
	    return ERROR;
	}
	
	if( msg_body_parse(&tl, &body) == -2 )
	    log("ftn2ftn: error parsing message body");
	/* Retrieve address information from body */
	kludge_pt_intl(&body, &msg, TRUE);

	if( do_message(gate, &msg, &body) != OK )
	    return ERROR;
    }

    /* Close packet */
    pkt_close();
    
    return OK;
}



/*
 * Unpack one packet file
 */
int unpack_file(Node *gate, char *pkt_name)
{
    Packet pkt;
    FILE *pkt_file;

    debug(1, "Unpacking FTN packet %s", pkt_name);

    /*
     * Open packet and read header
     */
    pkt_file = fopen(pkt_name, R_MODE);
    if(!pkt_file) {
	log("$Can't open packet %s", pkt_name);
	exit(EX_OSERR);
    }
    if(pkt_get_hdr(pkt_file, &pkt) == ERROR)
    {
	log("Error reading header from %s", pkt_name);
	exit(EX_OSERR);
    }
    
    /*
     * Unpack it
     */
    if(unpack(gate, pkt_file, &pkt) != OK) 
    {
	log("Error in unpacking %s", pkt_name);
	exit(EX_OSERR);
    }
    
    fclose(pkt_file);

    if (unlink(pkt_name)) {
	log("$Could not unlink packet %s", pkt_name);
	exit(EX_OSERR);
    }

    return OK;
}



/*
 * Process packet for gateway address in Binkley outbound
 */
int do_outbound(Node *gate_outb, Node *gate_other)
{
    char *name;
    
    /* Create BSY file */
    if( bink_bsy_create(gate_outb, NOWAIT) == ERROR )
	return ERROR;

    /* Find and process OUT packet file */
    if( (name = bink_find_out(gate_outb, NULL)) )
	unpack_file(gate_other, name);
    
    /* Delete BSY file */
    if( bink_bsy_delete(gate_outb) == ERROR )
	return ERROR;
    
    return OK;
}



/*
 * Usage messages
 */
void short_usage(void)
{
    fprintf(stderr, "usage: %s [-options] [packet ...]\n", PROGRAM);
    fprintf(stderr, "       %s --help  for more information\n", PROGRAM);
}


void usage(void)
{
    fprintf(stderr, "FIDOGATE %s  %s %s\n\n",
	    version_global(), PROGRAM, version_local(VERSION) );
    
    fprintf(stderr, "usage:   %s [-options] [packet ...]\n\n", PROGRAM);
    fprintf(stderr, "\
options: -A --address-a Z:N/F.P       FTN address in network A\n\
         -B --address-b Z:N/F.P       FTN address in network B\n\
	 -o --out-packet-file NAME    set output packet file name\n\
	 -O --out-packet-dir NAME     set output packet directory\n\
\n\
         -v --verbose                 more verbose\n\
	 -h --help                    this help\n\
         -c --config name             read config file (\"\" = none)\n\
	 -L --lib-dir name            set lib directory\n\
	 -S --spool-dir name          set spool directory\n\
	 -a --addr Z:N/F.P            set FTN address\n\
	 -u --uplink-addr Z:N/F.P     set FTN uplink address\n");
    
    exit(0);
}



/***** main() ****************************************************************/

int main(int argc, char **argv)
{
    int c;
    char *O_flag=NULL;
    char *c_flag=NULL;
    char *S_flag=NULL, *L_flag=NULL;
    char *a_flag=NULL, *u_flag=NULL;

    int option_index;
    static struct option long_options[] =
    {
	{ "address-a",    1, 0, 'A'},	/* Address A */
	{ "address-b",    1, 0, 'B'},	/* Address B */
	{ "out-packet-file",1,0,'o'},	/* Set packet file name */
	{ "out-dir",      1, 0, 'O'},	/* Set packet directory */

	{ "verbose",      0, 0, 'v'},	/* More verbose */
	{ "help",         0, 0, 'h'},	/* Help */
	{ "config",       1, 0, 'c'},	/* Config file */
	{ "spool-dir",    1, 0, 'S'},	/* Set FIDOGATE spool directory */
	{ "lib-dir",      1, 0, 'L'},	/* Set FIDOGATE lib directory */
	{ "addr",         1, 0, 'a'},	/* Set FIDO address */
	{ "uplink-addr",  1, 0, 'u'},	/* Set FIDO uplink address */
	{ 0,              0, 0, 0  }
    };

    log_program(PROGRAM);
    
    /* Init configuration */
    cf_initialize();


    while ((c = getopt_long(argc, argv, "A:B:o:O:vhc:S:L:a:u:",
			    long_options, &option_index     )) != EOF)
	switch (c) {
	/***** ftn2ftn options *****/
	case 'A':
	    if( asc_to_node(optarg, &gate_a, FALSE) != OK )
	    {
		fprintf(stderr, "%s: option -A: illegal address %s\n",
			PROGRAM, optarg);
		exit(EX_USAGE);
	    }
	    break;
	case 'B':
	    if( asc_to_node(optarg, &gate_b, FALSE) != OK )
	    {
		fprintf(stderr, "%s: option -B: illegal address %s\n",
			PROGRAM, optarg);
		exit(EX_USAGE);
	    }
	    break;
	case 'o':
	    /* Set packet file name */
	    o_flag = optarg;
	    break;
	case 'O':
	    /* Set packet dir */
	    O_flag = optarg;
	    break;
		
	/***** Common options *****/
	case 'v':
	    verbose++;
	    break;
	case 'h':
	    usage();
	    exit(0);
	    break;
	case 'c':
	    c_flag = optarg;
	    break;
	case 'S':
	    S_flag = optarg;
	    break;
	case 'L':
	    L_flag = optarg;
	    break;
	case 'a':
	    a_flag = optarg;
	    break;
	case 'u':
	    u_flag = optarg;
	    break;
	default:
	    short_usage();
	    exit(EX_USAGE);
	    break;
	}

    /*
     * Read config file
     */
    if(L_flag)				/* Must set libdir beforehand */
	cf_set_libdir(L_flag);
    cf_read_config_file(c_flag ? c_flag : CONFIG);

    /*
     * Process config options
     */
    if(L_flag)
	cf_set_libdir(L_flag);
    if(S_flag)
	cf_set_spooldir(S_flag);
    if(a_flag)
	cf_set_addr(a_flag);
    if(u_flag)
	cf_set_uplink(u_flag);

    cf_debug();
    debug(4, "gateway address A: %s", node_to_asc(&gate_a, TRUE));
    debug(4, "gateway address B: %s", node_to_asc(&gate_b, TRUE));


    /*
     * Process local options
     */
    if(O_flag)
	pkt_outdir(O_flag, NULL);
    else
	pkt_outdir(cf_spooldir(), OUTDIR);

    passwd_init();


    /*
     * Process command line file args
     */
    if(optind >= argc)
    {	
	/* Process outbound packets for both addresses */
	do_outbound(&gate_a, &gate_b);
	do_outbound(&gate_b, &gate_a);
    }
    else
	for(; optind<argc; optind++)
	    unpack_file(&gate_a, argv[optind]);

    exit(EX_OK);

    /**NOT REACHED**/
    return 1;
}
