/*-
 * Copyright (c) 2005-2008 Daniel Braniss <danny@cs.huji.ac.il>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 */
/*
 | $Id: pdu.c,v 2.2 2006/12/01 09:11:56 danny Exp danny $
 */

#include <sys/types.h>
#include <sys/time.h>
#include <sys/uio.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <stdio.h>
#include <stdarg.h>
#include <camlib.h>

#include "iscsi.h"
#include "iscontrol.h"

int
xmitpdu(isess_t *sess, pdu_t *pp)
{
     if(ioctl(sess->fd, ISCSISEND, pp)) {
          perror("xmitpdu");
          return -1;
     }
     if(vflag)
          pukeText("I-", pp);

     return 0;
}

int
recvpdu(isess_t *sess, pdu_t *pp)
{
     if(ioctl(sess->fd, ISCSIRECV, pp)) {
          perror("recvpdu");
          return -1;
     }
     // XXX: return error if truncated via
     // the FUDGE factor.
     if(vflag)
          pukeText("T-", pp);

     return 0;
}

int
sendPDU(isess_t *sess, pdu_t *pp, handler_t *hdlr)
{
     if(xmitpdu(sess, pp))
          return 0;
     if(hdlr) {
          int res;

          pp->ahs_size = 8 * 1024;
          if((pp->ahs = malloc(pp->ahs_size)) == NULL) {
               fprintf(stderr, "out of mem!");
               return -1;
          }
          pp->ds_size = 0;
          if((res = recvpdu(sess, pp)) != 0) {
               fprintf(stderr, "recvpdu failed\n");
               return res;
          }
          res = hdlr(sess, pp);
          freePDU(pp);
          return res;
     }
     return 1;
}


#define FUDGE (512 * 8)
/*
 | We use the same memory for the response
 | so make enough room ...
 | XXX: must find a better way.
 */
int
addText(pdu_t *pp, char *fmt, ...)
{
     u_int      len;
     char       *str;
     va_list    ap;

     va_start(ap, fmt);
     len = vasprintf(&str, fmt, ap) + 1;
     if((pp->ds_len + len) > 0xffffff) {
          printf("ds overflow\n");
          free(str);
          return 0;
     }

     if((pp->ds_len + len) > pp->ds_size) {
          u_char        *np;

          np = realloc(pp->ds, pp->ds_size + len + FUDGE);
          if(np == NULL) {
               free(str);
               //XXX: out of memory!
               return -1;
          }
          pp->ds = np;
          pp->ds_size += len + FUDGE;
     }
     memcpy(pp->ds + pp->ds_len, str, len);
     pp->ds_len += len;
     free(str);
     return len;
}

void
freePDU(pdu_t *pp)
{
     if(pp->ahs_size)
          free(pp->ahs);
     if(pp->ds_size)
          free(pp->ds);
     bzero(&pp->ipdu, sizeof(union ipdu_u));
     pp->ahs = NULL;
     pp->ds = NULL;
     pp->ahs_size = 0;
     pp->ds_size = pp->ds_len = 0;
}

void
pukeText(char *it, pdu_t *pp)
{
     char       *ptr;
     int        cmd;
     size_t     len, n;

     len = pp->ds_len;
     ptr = (char *)pp->ds;
     cmd = pp->ipdu.bhs.opcode;

     printf("%s: cmd=0x%x len=%d\n", it, cmd, (int)len);
     while(len > 0) {
          printf("\t%s\n", ptr);
          n = strlen(ptr) + 1;
          len -= n;
          ptr += n;
     }
}