xref: /csrg-svn/usr.bin/tn3270/api/api_exch.c (revision 31493)

#include <stdio.h>

#include "api_exch.h"

static int sock;		/* Socket number */

static char whoarewe[40] = "";
#define	WHO_ARE_WE()	fprintf(stderr, "(API %s) ", whoarewe);

static enum {CONTENTION, SEND, RECEIVE } conversation;

static struct exch_exch exch_state;

static unsigned int
    my_sequence,
    your_sequence;

static char ibuffer[40], *ibuf_next, *ibuf_last;
#define	IBUFADDED(i)		ibuf_last += (i)
#define	IBUFAVAILABLE()		(ibuf_last -ibuf_next)
#define	IBUFFER()		ibuffer
#define	IBUFGETBYTES(w,l)	{ memcpy(w, ibuf_next, l); ibuf_next += l; }
#define	IBUFGETCHAR()		(*ibuf_next++)
#define	IBUFGETSHORT()		((*ibuf_next++<<8)|(*ibuf_next++&0xff))
#define	IBUFRESET()		(ibuf_next = ibuf_last = ibuffer)

char obuffer[40], *obuf_next;
#define	OBUFADDBYTES(w,l)	{ memcpy(obuf_next, w, l); obuf_next += l; }
#define	OBUFADDCHAR(c)		(*obuf_next++ = c)
#define	OBUFADDSHORT(s)		{*obuf_next++ = (s)>>8; *obuf_next++ = s; }
#define	OBUFAVAILABLE()		(obuf_next - obuffer)
#define	OBUFFER()		obuffer
#define	OBUFRESET()		obuf_next = obuffer
#define	OBUFROOM()		(obuffer+sizeof obuffer-obuf_next)


static int
outflush()
{
    int length = OBUFAVAILABLE();

    if (length != 0) {
	if (write(sock, OBUFFER(), length) != length) {
	    WHO_ARE_WE();
	    perror("write");
	    return -1;
	}
	OBUFRESET();
    }
    return 0;				/* All OK */
}


static int
infill(count)
int count;
{
    int i;

    if (OBUFAVAILABLE()) {
	if (outflush() == -1) {
	    return -1;
	}
    }
    if (ibuf_next == ibuf_last) {
	IBUFRESET();
    }
    if ((count -= IBUFAVAILABLE()) < 0) {
	return 0;
    }
    while (count) {
	if ((i = read(sock, IBUFFER(), count)) < 0) {
	    WHO_ARE_WE();
	    perror("read");
	    return -1;
	}
	if (i == 0) {
	    /* Reading past end-of-file */
	    WHO_ARE_WE();
	    fprintf(stderr, "End of file read\r\n");
	    return -1;
	}
	count -= i;
	IBUFADDED(i);
    }
    return 0;
}

static char *
exch_to_ascii(exch)
int exch;			/* opcode to decode */
{
    switch (exch) {
    case EXCH_EXCH_COMMAND:
	return "Command";
    case EXCH_EXCH_TYPE:
	return "Type";
    case EXCH_EXCH_TURNAROUND:
	return "Turnaround";
    case EXCH_EXCH_RTS:
	return "Request to Send";
    default:
	{
	    static char unknown[40];

	    sprintf(unknown, "(Unknown exchange 0x%02x)", exch&0xff);
	    return unknown;
	}
    }
}

/*
 * Send the exch structure, updating the sequnce number field.
 */

static int
send_state()
{
    if (OBUFROOM() < sizeof exch_state) {
	if (outflush() == -1) {
	    return -1;
	}
    }
    exch_state.my_sequence = ++my_sequence;
    exch_state.your_sequence = your_sequence;
    OBUFADDBYTES((char *)&exch_state, sizeof exch_state);
    return 0;
}

/*
 * Receive the exch structure from the other side, checking
 * sequence numbering.
 */

static int
receive_state()
{
    if (IBUFAVAILABLE() < sizeof exch_state) {
	if (infill(sizeof exch_state) == -1) {
	    return -1;
	}
    }
    IBUFGETBYTES((char *)&exch_state, sizeof exch_state);
    if (conversation != CONTENTION) {
	if (exch_state.your_sequence != my_sequence) {
	    WHO_ARE_WE();
	    fprintf(stderr, "Send sequence number mismatch.\n");
	    return -1;
	}
	if (exch_state.my_sequence != ++your_sequence) {
	    WHO_ARE_WE();
	    fprintf(stderr, "Receive sequence number mismatch.\n");
	    return -1;
	}
    } else {
	/* In contention state, no sequence numbering */
	your_sequence = exch_state.my_sequence;
    }
    return 0;
}

static int
enter_receive()
{
    switch (conversation) {
    case CONTENTION:
	exch_state.opcode = EXCH_EXCH_TURNAROUND;
	if (send_state() == -1) {
	    return -1;
	}
	if (receive_state() == -1) {
	    return -1;
	}
	if (exch_state.opcode != EXCH_EXCH_RTS) {
	    WHO_ARE_WE();
	    fprintf(stderr, "In CONTENTION state:  ");
	    if (exch_state.opcode == EXCH_EXCH_TURNAROUND) {
		fprintf(stderr,
		    "Both sides tried to enter RECEIVE state.\n");
	    } else {
		fprintf(stderr,
		    "Protocol error trying to enter RECEIVE state.\n");
	    }
	    return -1;
	}
	break;
    case SEND:
	exch_state.opcode = EXCH_EXCH_TURNAROUND;
	if (send_state() == -1) {
	    return -1;
	}
	break;
    }
    conversation = RECEIVE;
    return 0;
}

static int
enter_send()
{
    switch (conversation) {
    case CONTENTION:
	exch_state.opcode = EXCH_EXCH_RTS;
	if (send_state() == -1) {
	    return -1;
	}
	 /* fall through */
    case RECEIVE:
	if (receive_state() == -1) {
	    return -1;
	}
	if (exch_state.opcode != EXCH_EXCH_TURNAROUND) {
	    WHO_ARE_WE();
	    fprintf(stderr, "Conversation error - both sides in SEND state.\n");
	    return -1;
	}
    }
    conversation = SEND;
    return 0;
}

int
api_exch_nextcommand()
{
    if (conversation != RECEIVE) {
	if (enter_receive() == -1) {
	    return -1;
	}
    }
    if (receive_state() == -1) {
	return -1;
    }
    if (exch_state.opcode != EXCH_EXCH_COMMAND) {
	WHO_ARE_WE();
	fprintf(stderr, "Expected a %s exchange, received a %s exchange.\n",
	    exch_to_ascii(EXCH_EXCH_COMMAND), exch_to_ascii(exch_state.opcode));
	return -1;
    }
    return exch_state.command_or_type;
}


int
api_exch_incommand(command)
int command;
{
    int i;

    if ((i = api_exch_nextcommand()) == -1) {
	return -1;
    }
    if (i != command) {
	WHO_ARE_WE();
	fprintf(stderr, "Expected API command 0x%x, got API command 0x%x.\n",
				command, i);
	return -1;
    }
    return 0;
}


int
api_exch_outcommand(command)
int command;
{
    if (conversation != SEND) {
	if (enter_send() == -1) {
	    return -1;
	}
    }
    exch_state.command_or_type = command;
    exch_state.opcode = EXCH_EXCH_COMMAND;
    if (send_state() == -1) {
	return -1;
    } else {
	return 0;
    }
}


int
api_exch_outtype(type, length, location)
int
    type,
    length;
char
    *location;
{
    int netleng = htons(length);

    if (conversation != SEND) {
	if (enter_send() == -1) {
	    return -1;
	}
    }
    exch_state.opcode = EXCH_EXCH_TYPE;
    exch_state.command_or_type = type;
    exch_state.length = netleng;
    if (send_state() == -1) {
	return -1;
    }
    if (length) {
	if (OBUFROOM() > length) {
	    OBUFADDBYTES(location, length);
	} else {
	    if (outflush() == -1) {
		return -1;
	    }
	    if (write(sock, location, length) != length) {
		WHO_ARE_WE();
		perror("write");
		return -1;
	    }
	}
    }
    return 0;
}


int
api_exch_intype(type, length, location)
int
    type,
    length;
char
    *location;
{
    int i, netleng = htons(length);

    if (conversation != RECEIVE) {
	if (enter_receive() == -1) {
	    return -1;
	}
    }
    if (receive_state() == -1) {
	return -1;
    }
    if (exch_state.opcode != EXCH_EXCH_TYPE) {
	WHO_ARE_WE();
	fprintf(stderr,
	    "Expected to receive a %s exchange, received a %s exchange.\n",
	    exch_to_ascii(EXCH_EXCH_TYPE), exch_to_ascii(exch_state.opcode));
	return -1;
    }
    if (exch_state.command_or_type != type) {
	WHO_ARE_WE();
	fprintf(stderr, "Expected type 0x%x, got type 0x%x.\n",
	    type, exch_state.command_or_type);
	return -1;
    }
    if (exch_state.length != netleng) {
	fprintf(stderr, "Type 0x%x - expected length %d, received length %d.\n",
		type, length, ntohs(exch_state.length));
	return -1;
    }
    while (length) {
	if ((i = read(sock, location, length)) < 0) {
	    WHO_ARE_WE();
	    perror("read");
	    return -1;
	}
	length -= i;
	location += i;
    }
    return 0;
}

int
api_exch_flush()
{
    return outflush();
}

int
api_exch_init(sock_number, ourname)
int sock_number;
char *ourname;
{
    sock = sock_number;
    strcpy(whoarewe, ourname);		/* For error messages */

    my_sequence = your_sequence = 0;

    conversation = CONTENTION;		/* We don't know which direction */

    IBUFRESET();
    OBUFRESET();

    return 0;
}