/*:ts=8*/
/*****************************************************************************
 * FIDOGATE --- Gateway UNIX Mail/News <-> FIDO NetMail/EchoMail
 *
 * $Id: packet.c,v 4.3 1996/12/17 17:19:46 mj Exp $
 *
 * Functions to read/write packets and messages
 *
 *****************************************************************************
 * 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"



/*
 * Outbound packets: directory, name, temp. name, file
 */
static char packet_dir [MAXPATH];
static char packet_bad [MAXPATH];
static char packet_name[MAXPATH];
static char packet_tmp [MAXPATH];
static FILE *packet_file = NULL;
static Node packet_node = { -1, -1, -1, -1, "" };
static int packet_bsy = FALSE;

static char *pkt_newname	(char *);
static FILE *pkt_open_node	(Node *, char *, int);
static FILE *pkt_create		(Node *);


/*
 * Set output packet directory
 */
void pkt_outdir(char *dir1, char *dir2)
{
    str_expand_name(packet_dir, sizeof(packet_dir), dir1);
    if(dir2)
    {
	BUF_APPEND(packet_dir, "/" );
	BUF_APPEND(packet_dir, dir2);
    }
}

/*
 * Return packet_dir[] name
 */
char *pkt_get_outdir(void)
{
    return packet_dir;
}



/*
 * Set bad packet directory
 */
void pkt_baddir(char *dir1, char *dir2)
{
    str_expand_name(packet_bad, sizeof(packet_bad), dir1);
    if(dir2)
    {
	BUF_APPEND(packet_bad, "/" );
	BUF_APPEND(packet_bad, dir2);
    }
}

/*
 * Return packet_bad[] name
 */
char *pkt_get_baddir(void)
{
    return packet_bad;
}



/*
 * Return packet name / temp name
 */
char *pkt_name(void)
{
    return packet_name;
}

char *pkt_tmpname(void)
{
    return packet_tmp;
}



/*
 * Return open status (packet_file != NULL)
 */
int pkt_isopen(void)
{
    return packet_file != NULL;
}



/*
 * Get name for new packet
 */
static char *pkt_newname(char *name)
{
    if(name)
    {
	strncpy0(packet_name, name, sizeof(packet_name));
	strncpy0(packet_tmp , name, sizeof(packet_tmp ));
    }
    else
    {
	long n = sequencer(SEQ_PKT);
	sprintf(packet_name, "%s/%08ld.pkt", packet_dir, n);
	sprintf(packet_tmp , "%s/%08ld.tmp", packet_dir, n);
    }

    return packet_name;
}



/*
 * Open .OUT packet in Binkley outbound
 */
#define MAX_COUNT 50

static FILE *pkt_open_node(Node *node, char *flav, int bsy)
{
    char *out;
    FILE *fp;
    long pos;
    Packet pkt;
    int count;
    
    /* Name of .OUT file */
    out = bink_find_out(node, flav);
    if(!out)
	return NULL;
    /* Create directory if necessary */
    if(bink_mkdir(node) == ERROR)
	return NULL;

    packet_bsy = bsy;
    if(bsy)
	if(bink_bsy_create(node, WAIT) == ERROR)
	    return NULL;

    pkt_newname(out);

    /*
     * Open and lock OUT packet
     */
    count = 0;
    do
    {
	count++;
	/*
	 * Check count and give up, if too many retries
	 */
	if(count >= MAX_COUNT)
	{
	    fp = NULL;
	    break;
	}
	
	/* Open OUT file for append, creating empty one if necessary */
	debug(4, "Open OUT file in append mode");
	fp = fopen(out, A_MODE);
	if(fp == NULL)
	{
	    /* If this failed we're out of luck ... */
	    log("$ERROR: can't open OUT file %s", out);
	    break;
	}

	/* Reopen in read/write mode */
	debug(4, "Reopen OUT file in read/write mode");
	fclose(fp);
	fp = fopen(out, RP_MODE);
	if(fp == NULL)
	{
	    /* OUT file deleted in the meantime - retry */
	    debug(4, "OUT file deleted, retrying");
	    continue;
	}
	chmod(out, PACKET_MODE);

	/* Lock it, waiting for lock to be granted */
	debug(4, "Locking OUT file");
	if(lock_file(fp))
	{
	    /* Lock error ... */
	    log("$ERROR: can't lock OUT file %s", out);
	    fclose(fp);
	    fp = NULL;
	    break;
	}

	/* Lock succeeded, but the OUT file may have been deleted */
	if(access(out, F_OK) == -1)
	{
	    debug(4, "OUT file deleted, retrying");
	    fclose(fp);
	    fp = NULL;
	}
    }
    while(fp == NULL);

    /*
     * fp==NULL is an error in the do ... while loop
     */
    if(fp == NULL)
    {
	if(bsy)
	    bink_bsy_delete(node);
	return NULL;
    }

    /*
     * Test, whether this is a new empty packet, or an already existing one.
     */
    /* Seek to EOF */
    if(fseek(fp, 0L, SEEK_END) == -1)
    {
	/* fseek() error ... */
	log("$ERROR: fseek EOF OUT file %s failed", out);
	if(bsy)
	    bink_bsy_delete(node);
	fclose(fp);
	return NULL;
    }
    if( (pos = ftell(fp)) == -1L )
    {
	/* ftell() error ... */
	log("$ERROR: ftell OUT file %s failed", out);
	if(bsy)
	    bink_bsy_delete(node);
	fclose(fp);
	return NULL;
    }

    if(pos == 0L)
    {
	Passwd *pwd;
	
	/*
	 * This is a new packet file
	 */
	debug(4, "%s is a new packet, writing header", out);
	
	pkt.from = cf_n_addr();
	pkt.to   = *node;
	pkt.time = time(NULL);
	/* Password */
	pwd = passwd_lookup("packet", node);
	strncpy0(pkt.passwd, pwd ? pwd->passwd : "", sizeof(pkt.passwd));

	/* Rest is filled in by pkt_put_hdr() */
	if(pkt_put_hdr(fp, &pkt) == ERROR)
	{
	    log("$ERROR: can't write to packet file %s", out);
	    if(bsy)
		bink_bsy_delete(node);
	    fclose(fp);
	    return NULL;
	}
    }
    else
    {
	/*
	 * This is an already existing packet file: seek to end of file
	 * - 2, there must be a terminating 0-word. Start writing new data
	 * at the EOF - 2 position.
	 */
	debug(4, "%s already exists, seek to EOF-2", out);

	if(fseek(fp, -2L, SEEK_END) == -1)
	{
	    /* fseek() error ... */
	    log("$ERROR: fseek EOF-2 OUT file %s failed", out);
	    if(bsy)
		bink_bsy_delete(node);
	    fclose(fp);
	    return NULL;
	}
	if( pkt_get_int16(fp) != 0L )
	{
	    log("$ERROR: malformed packet %s, no terminating 0-word", out);
	    if(bsy)
		bink_bsy_delete(node);
	    fclose(fp);
	    return NULL;
	}
	if(fseek(fp, -2L, SEEK_END) == -1)
	{
	    /* fseek() error ... */
	    log("$ERROR: fseek EOF-2 OUT file %s failed", out);
	    if(bsy)
		bink_bsy_delete(node);
	    fclose(fp);
	    return NULL;
	}
    }

    packet_file = fp;
    packet_node = *node;
    
    return fp;
}



/*
 * Create new packet
 */
static FILE *pkt_create(Node *to)
{
    Packet pkt;
    Passwd *pwd;
    
    if((packet_file = fopen(packet_tmp, W_MODE)) == NULL)
    {
	log("$ERROR: pkt_open(): can't create packet %s", packet_tmp);
	return NULL;
    }
    
    /*
     * Change mode to PACKET_MODE
     */
    chmod(packet_tmp, PACKET_MODE);
    
    debug(4, "New packet file %s (tmp %s)", packet_name, packet_tmp);
    
    /*
     * Write packet header
     */
    pkt.from = cf_n_addr();
    pkt.to   = *to;
    pkt.time = time(NULL);
    /* Password */
    pwd = passwd_lookup("packet", to);
    strncpy0(pkt.passwd, pwd ? pwd->passwd : "", sizeof(pkt.passwd));

    /* Rest is filled in by pkt_put_hdr() */
    if(pkt_put_hdr(packet_file, &pkt) == ERROR)
    {
	log("$ERROR: can't write to packet file %s", packet_tmp);
	return NULL;
    }

    return packet_file;
}



/*
 * Create new packet file
 */
FILE *pkt_open(char *name, Node *node, char *flav, int bsy)
{
    if(name && !name[0])
	name = NULL;

    if(node && !name)
	/*
	 * Open packet in Binkley outbound
	 */
	return pkt_open_node(node, flav, bsy);
    else
    {
	/*
	 * Open packet in FIDOGATE outbound directory or named packet
	 */
	pkt_newname(name);
	return pkt_create( node ? node : cf_uplink() );
    }

    /**NOT REACHED**/
    return NULL;
}



/*
 * Write end of packet to packet file, close and rename it.
 */
int pkt_close(void)
{
    int ret = OK;
    
    if(packet_file)
    {
	/* End of packet */
	pkt_put_int16(packet_file, 0);
	ret = fclose(packet_file);
	
	packet_file = NULL;

	if(packet_node.zone != -1)
	{
	    if(packet_bsy)
		bink_bsy_delete(&packet_node);
	    packet_bsy = FALSE;
	    packet_node.zone = -1;
	}
	
	/* Rename .tmp -> .pkt, if not the same name */
	if( strcmp(packet_tmp, packet_name) )
	    if(rename(packet_tmp, packet_name) == ERROR)
	    {
		log("$ERROR: can't rename %s to %s", packet_tmp, packet_name);
		ret = ERROR;
	    }
    }

    return ret;
}



/*
 * Read null-terminated string from packet file
 */
int pkt_get_string(FILE *fp, char *buf, int nbytes)
{
    int c, i;

    for(i=0; TRUE; i++)
    {
	c = getc(fp);
	if(c==0 || c==EOF)
	    break;
	if(i >= nbytes-1)
	    break;
	buf[i] = c;
    }
    buf[i] = 0;
    
    return c!=0 ? ERROR : OK;
}



/*
 * Return date of message in UNIX format (secs after the epoche)
 *
 * Understood formats: see FTS-0001 (actually using getdate.y parser)
 */
time_t pkt_get_date(FILE *fp)
{
    /*
     * Allow some characters more in the date string.
     */
    char buf[MSG_MAXDATE + 10];

    /*
     * Treat FTN date as a 0-terminated string. Actually it's a fixed
     * string with exactly 19 chars + 0-char.
     */
    buf[0] = 0;
    pkt_get_string(fp, buf, sizeof(buf));
    
    return parsedate(buf, NULL);
}



/*
 * Read message header from packet file
 */
int pkt_get_msg_hdr(FILE *fp, Message *msg)
{
    msg->node_from.node = pkt_get_int16(fp);
    msg->node_to  .node = pkt_get_int16(fp);
    msg->node_from.net  = pkt_get_int16(fp);
    msg->node_to  .net  = pkt_get_int16(fp);
    msg->node_orig      = msg->node_from;
    msg->attr           = pkt_get_int16(fp);
    msg->cost           = pkt_get_int16(fp);
    msg->date           = pkt_get_date(fp);

    pkt_get_string( fp, msg->name_to  , sizeof(msg->name_to  ) );
    pkt_get_string( fp, msg->name_from, sizeof(msg->name_from) );
    pkt_get_string( fp, msg->subject  , sizeof(msg->subject  ) );

    msg->area = NULL;
    
    if(verbose >= 6)
	pkt_debug_msg_hdr(stderr, msg, "Reading ");
    
    return ferror(fp);
}



/*
 * Debug output of message header
 */
void pkt_debug_msg_hdr(FILE *out, Message *msg, char *txt)
{
    fprintf(out, "%sFTN message header:\n", txt);
    fprintf(out, "    From: %-36s @ %s\n",
	    msg->name_from, node_to_asc(&msg->node_from, TRUE));
    fprintf(out, "    To  : %-36s @ %s\n",
	    msg->name_to  , node_to_asc(&msg->node_to  , TRUE));
    fprintf(out, "    Subj: %s\n", msg->subject);
    fprintf(out, "    Date: %s\n",
	    msg->date!=-1 ? date(NULL, &msg->date) : "LOCAL" );
    fprintf(out, "    Attr: %04x\n", msg->attr);
}



/*
 * Write string to packet in null-terminated format.
 */
int pkt_put_string(FILE *fp, char *s)
{
    fputs(s, fp);
    putc(0, fp);
    
    return ferror(fp);
}



/*
 * Write line to packet, replacing \n with \r\n
 */
int pkt_put_line(FILE *fp, char *s)
{
    for(; *s; s++)
    {
	if(*s == '\n')
	    putc('\r', fp);
	putc(*s, fp);
    }

    return ferror(fp);
}
    


/*
 * Write 16-bit integer in 80x86 format, i.e. low byte first,
 * then high byte. Machine independent function.
 */
int pkt_put_int16(FILE *fp, int value)
{
    putc(value & 0xff, fp);
    putc((value >> 8) & 0xff, fp);

    return ferror(fp);
}



/*
 * Write date/time in FTS-0001 format
 */
int pkt_put_date(FILE *pkt, time_t t)
{
    static time_t last = -1;

    if(t == -1)
    {
	/* No valid time, use local time */
	debug(7, "using local time");
	t = time(NULL);
	/* Kludge to avoid the same date/time */
	if(t == last)
	    t += 2;
	last = t;
    }
    
    /* Date according to FTS-0001 */
    pkt_put_string(pkt, date("%d %b %y  %H:%M:%S", &t) );

    return ferror(pkt);
}



/*
 * Write message header to packet.
 */
int pkt_put_msg_hdr(FILE *pkt, Message *msg, int kludge_flag)
    /* kludge_flag --- TRUE: write AREA/^AINTL,^AFMPT,^ATOPT */
{
    if(verbose >= 6)
	pkt_debug_msg_hdr(stderr, msg, "Writing ");

    /*
     * Write message header
     */
    pkt_put_int16 (pkt, MSG_TYPE           );
    pkt_put_int16 (pkt, msg->node_from.node);
    pkt_put_int16 (pkt, msg->node_to  .node);
    pkt_put_int16 (pkt, msg->node_from.net );
    pkt_put_int16 (pkt, msg->node_to  .net );
    pkt_put_int16 (pkt, msg->attr          );
    pkt_put_int16 (pkt, msg->cost          );
    
    pkt_put_date  (pkt, msg->date          );
    pkt_put_string(pkt, msg->name_to       );
    pkt_put_string(pkt, msg->name_from     );
    pkt_put_string(pkt, msg->subject       );

    if(!kludge_flag)
	return ferror(pkt);
    
    /*
     * Write area tag / zone, point adressing kludges
     */
    if(msg->area)
	fprintf(pkt, "AREA:%s\r\n", msg->area);
    else 
    {
#ifdef FTN_FORCE_INTL
	if(TRUE)
#else
	if(cf_zone()    != msg->node_from.zone  ||
	   cf_defzone() != msg->node_from.zone  ||
	   cf_zone()    != msg->node_to  .zone  ||
	   cf_defzone() != msg->node_to  .zone     )
#endif
	{
	    Node tmpf, tmpt;
	    
	    tmpf = msg->node_from; tmpf.point = 0; tmpf.domain[0] = 0;
	    tmpt = msg->node_to;   tmpt.point = 0; tmpt.domain[0] = 0;
	    fprintf(pkt, "\001INTL %s %s\r\n",
		    node_to_asc(&tmpt, FALSE), node_to_asc(&tmpf, FALSE));
	}

/* Kludge: always generate ^AFMPT, because SQUISH adds point address,
 * if the origin address of the packet is a point address.
 **	if(msg->node_from.point)  **/
	    fprintf(pkt, "\001FMPT %d\r\n", msg->node_from.point);
	if(msg->node_to  .point)
	    fprintf(pkt, "\001TOPT %d\r\n", msg->node_to  .point);
    }

    return ferror(pkt);
}



/*
 * Read 16-bit integer in 80x86 format, i.e. low byte first,
 * then high byte. Machine independent function.
 */
long pkt_get_int16(FILE *fp)
{
    int c;
    unsigned val;

    if((c = getc(fp)) == EOF)
	return ERROR;
    val	 = c;
    if((c = getc(fp)) == EOF)
	return ERROR;
    val |= c << 8;

    return val;
}



/*
 * Read n bytes from file stream
 */
int pkt_get_nbytes(FILE *fp, char *buf, int n)
{
    int c;
    
    while(n--)
    {
	if((c = getc(fp)) == EOF)
	    return ERROR;
	*buf++ = c;
    }
    
    return ferror(fp);
}



/*
 * Read packet header from file
 */
int pkt_get_hdr(FILE *fp, Packet *pkt)
{
    long val;
    struct tm t;
    int ozone, dzone;
    int cw, swap;
    char xpkt[4];

    node_clear(&pkt->from);
    node_clear(&pkt->to);
    pkt->time      = -1;
    pkt->baud      = 0;
    pkt->version   = 0;
    pkt->product_l = 0;
    pkt->product_h = 0;
    pkt->rev_min   = 0;
    pkt->rev_maj   = 0;
    pkt->passwd[0] = 0;
    pkt->capword   = 0;

    /* Orig node */
    if((val = pkt_get_int16(fp)) == ERROR)  return ERROR;
    pkt->from.node = val;
    /* Dest node */
    if((val = pkt_get_int16(fp)) == ERROR)  return ERROR;
    pkt->to.node = val;
    /* Year */
    if((val = pkt_get_int16(fp)) == ERROR)  return ERROR;
    t.tm_year = val - 1900;
    /* Month */
    if((val = pkt_get_int16(fp)) == ERROR)  return ERROR;
    t.tm_mon = val;
    /* Day */
    if((val = pkt_get_int16(fp)) == ERROR)  return ERROR;
    t.tm_mday = val;
    /* Hour */
    if((val = pkt_get_int16(fp)) == ERROR)  return ERROR;
    t.tm_hour = val;
    /* Minute */
    if((val = pkt_get_int16(fp)) == ERROR)  return ERROR;
    t.tm_min = val;
    /* Second */
    if((val = pkt_get_int16(fp)) == ERROR)  return ERROR;
    t.tm_sec = val;
    t.tm_wday = -1;
    t.tm_yday = -1;
    t.tm_isdst = -1;
    pkt->time = mktime(&t);
    /* Baud */
    if((val = pkt_get_int16(fp)) == ERROR)  return ERROR;
    pkt->baud = val;
    /* Version --- MUST BE PKT_VERSION (2) */
    if((val = pkt_get_int16(fp)) == ERROR)  return ERROR;
    if(val != PKT_VERSION)
	return ERROR;
    pkt->version = val;
    /* Orig net */
    if((val = pkt_get_int16(fp)) == ERROR)  return ERROR;
    pkt->from.net = val;
    /* Dest net */
    if((val = pkt_get_int16(fp)) == ERROR)  return ERROR;
    pkt->to.net = val;
    /* Prod code lo */
    if((val = getc(fp)) == ERROR)           return ERROR;
    pkt->product_l = val;
    /* Revision major */
    if((val = getc(fp)) == ERROR)           return ERROR;
    pkt->rev_maj = val;
    /* Password */
    if(pkt_get_nbytes(fp, pkt->passwd, PKT_MAXPASSWD) == ERROR)  return ERROR;
    pkt->passwd[PKT_MAXPASSWD] = 0;
    /* Orig zone (FTS-0001 optional, QMail) */
    if((val = pkt_get_int16(fp)) == ERROR)  return ERROR;
    ozone = val;
    if(ozone)
	pkt->from.zone = ozone;
    /* Dest zone (FTS-0001 optional, QMail) */
    if((val = pkt_get_int16(fp)) == ERROR)  return ERROR;
    dzone = val;
    if(dzone)
	pkt->to.zone = dzone;
    /* Spare (auxNet in FSC-0048) */
    if((val = pkt_get_int16(fp)) == ERROR)  return ERROR;
    /* Cap word byte-swapped copy */
    if((val = getc(fp)) == ERROR)           return ERROR;
    swap = val << 8;
    if((val = getc(fp)) == ERROR)           return ERROR;
    swap |= val;
    /* Prod code hi */
    if((val = getc(fp)) == ERROR)           return ERROR;
    pkt->product_h = val;
    /* Revision minor */
    if((val = getc(fp)) == ERROR)           return ERROR;
    pkt->rev_min = val;
    /* Cap word */
    if((val = pkt_get_int16(fp)) == ERROR)  return ERROR;
    cw = val;
    if(cw && cw == swap)	/* 2+ packet according to FSC-0039 */
	debug(9, "Packet: type 2+");
    else
	cw = 0;
    pkt->capword = cw;
    /* Orig zone (FSC-0039) */
    if((val = pkt_get_int16(fp)) == ERROR)  return ERROR;
    if(cw)
    {
	pkt->from.zone = val;
	if(ozone != val)
	    debug(9, "Packet: different zones %d (FTS-0001) / %d (FSC-0039)",
		  ozone, val);
    }
    /* Dest zone (FSC-0039) */
    if((val = pkt_get_int16(fp)) == ERROR)  return ERROR;
    if(cw)
    {
	pkt->to.zone = val;
	if(dzone != val)
	    debug(9, "Packet: different zones %d (FTS-0001) / %d (FSC-0039)",
		  dzone, val);
    }
    /* Orig point (FSC-0039) */
    if((val = pkt_get_int16(fp)) == ERROR)  return ERROR;
    if(cw)
	pkt->from.point = val;
    /* Dest point (FSC-0039) */
    if((val = pkt_get_int16(fp)) == ERROR)  return ERROR;
    if(cw)
	pkt->to.point = val;
    /* Prod specific data */
    if(pkt_get_nbytes(fp, xpkt, 4) == ERROR)  return ERROR;

    if(verbose >= 3)
	pkt_debug_hdr(stderr, pkt, "Reading ");
    
    return ferror(fp);
}



/*
 * Debug output of packet header
 */
void pkt_debug_hdr(FILE *out, Packet *pkt, char *txt)
{
    fprintf(out, "%sFTN packet header:\n", txt);
    fprintf(out, "    From: %s\n", node_to_asc(&pkt->from, TRUE));
    fprintf(out, "    To  : %s\n", node_to_asc(&pkt->to  , TRUE));
    fprintf(out, "    Date: %s\n", date(NULL, &pkt->time));
    fprintf(out, "    Baud: %d\n", pkt->baud);
    fprintf(out, "    Prod: %02x %02x\n", pkt->product_h, pkt->product_l);
    fprintf(out, "    Rev : %d.%d\n", pkt->rev_maj, pkt->rev_min);
    fprintf(out, "    Pass: \"%s\"\n", pkt->passwd);
    fprintf(out, "    Capw: %04x\n", pkt->capword & 0xffff);
}
    


/*
 * Write string to packet, padded with 0 bytes to length n
 */
int pkt_put_string_padded(FILE *fp, char *s, int n)
{
    int i;
    for(i=0; *s && i<n; s++, i++)
	putc(*s, fp);
    for(; i<n; i++)
	putc(0, fp);
    
    return ferror(fp);
}



/*
 * Write packet header to file. This function always writes a 2+
 * (FSC-0039) header.
 */
int pkt_put_hdr(FILE *fp, Packet *pkt)
{
    struct tm *tm;
    int swap;

    /*
     * Fill rest of Packet structure
     */
    pkt->baud      = 0;
    pkt->version   = PKT_VERSION;
    pkt->product_l = PRODUCT_CODE;
    pkt->product_h = 0;
    pkt->rev_min   = version_minor();
    pkt->rev_maj   = version_major();
    pkt->capword   = 0x0001;		/* Designates packet type 2+ */
    swap           = 0x0100;		/* Byte swapped capability word */
    tm = localtime(&pkt->time);
    
    if(verbose >= 3)
	pkt_debug_hdr(stderr, pkt, "Writing ");

    /*
     * Write the actual header
     */
    pkt_put_int16        (fp, pkt->from.node);
    pkt_put_int16        (fp, pkt->to  .node);
    pkt_put_int16        (fp, tm->tm_year+1900);
    pkt_put_int16        (fp, tm->tm_mon);
    pkt_put_int16        (fp, tm->tm_mday);
    pkt_put_int16        (fp, tm->tm_hour);
    pkt_put_int16        (fp, tm->tm_min);
    pkt_put_int16        (fp, tm->tm_sec);
    pkt_put_int16        (fp, pkt->baud);
    pkt_put_int16        (fp, pkt->version);
    pkt_put_int16        (fp, pkt->from.net);
    pkt_put_int16        (fp, pkt->to  .net);
    putc                 (    pkt->product_l, fp);
    putc                 (    pkt->rev_maj,   fp);
    pkt_put_string_padded(fp, pkt->passwd, PKT_MAXPASSWD);
    pkt_put_int16        (fp, pkt->from.zone);
    pkt_put_int16        (fp, pkt->to  .zone);
    pkt_put_int16        (fp, 0 /* Spare */ );
    pkt_put_int16        (fp, swap);
    putc                 (    pkt->product_h, fp);
    putc                 (    pkt->rev_min,   fp);
    pkt_put_int16        (fp, pkt->capword);
    pkt_put_int16        (fp, pkt->from.zone);
    pkt_put_int16        (fp, pkt->to  .zone);
    pkt_put_int16        (fp, pkt->from.point);
    pkt_put_int16        (fp, pkt->to  .point);
    fputs                (    "XPKT", fp);	/* Like SQUISH */

    return ferror(fp);
}
