sbin/iscontrol/pdu.c

   1 /*-
   2  * Copyright (c) 2005-2008 Daniel Braniss <danny@cs.huji.ac.il>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  */
  27 /*
  28  | $Id: pdu.c,v 2.2 2006/12/01 09:11:56 danny Exp danny $
  29  */
  30
  31 #include <sys/cdefs.h>
  32
  33 #include <sys/types.h>
  34 #include <sys/time.h>
  35 #include <sys/uio.h>
  36 #include <sys/ioctl.h>
  37 #include <unistd.h>
  38 #include <stdlib.h>
  39 #include <string.h>
  40 #include <errno.h>
  41 #include <stdio.h>
  42 #include <stdarg.h>
  43 #include <camlib.h>
  44
  45 #include "iscsi.h"
  46 #include "iscontrol.h"
  47
  48 int
  49 xmitpdu(isess_t *sess, pdu_t *pp)
  50 {
  51      if(ioctl(sess->fd, ISCSISEND, pp)) {
  52           perror("xmitpdu");
  53           return -1;
  54      }
  55      if(vflag)
  56           pukeText("I-", pp);
  57
  58      return 0;
  59 }
  60
  61 int
  62 recvpdu(isess_t *sess, pdu_t *pp)
  63 {
  64      if(ioctl(sess->fd, ISCSIRECV, pp)) {
  65           perror("recvpdu");
  66           return -1;
  67      }
  68      // XXX: return error if truncated via
  69      // the FUDGE factor.
  70      if(vflag)
  71           pukeText("T-", pp);
  72
  73      return 0;
  74 }
  75
  76 int
  77 sendPDU(isess_t *sess, pdu_t *pp, handler_t *hdlr)
  78 {
  79      if(xmitpdu(sess, pp))
  80           return 0;
  81      if(hdlr) {
  82           int res;
  83
  84           pp->ahs_size = 8 * 1024;
  85           if((pp->ahs = malloc(pp->ahs_size)) == NULL) {
  86                fprintf(stderr, "out of mem!");
  87                return -1;
  88           }
  89           pp->ds_size = 0;
  90           if((res = recvpdu(sess, pp)) != 0) {
  91                fprintf(stderr, "recvpdu failed\n");
  92                return res;
  93           }
  94           res = hdlr(sess, pp);
  95           freePDU(pp);
  96           return res;
  97      }
  98      return 1;
  99 }
 100
 101
 102 #define FUDGE (512 * 8)
 103 /*
 104  | We use the same memory for the response
 105  | so make enough room ...
 106  | XXX: must find a better way.
 107  */
 108 int
 109 addText(pdu_t *pp, char *fmt, ...)
 110 {
 111      u_int      len;
 112      char       *str;
 113      va_list    ap;
 114
 115      va_start(ap, fmt);
 116      len = vasprintf(&str, fmt, ap) + 1;
 117      if((pp->ds_len + len) > 0xffffff) {
 118           printf("ds overflow\n");
 119           free(str);
 120           return 0;
 121      }
 122
 123      if((pp->ds_len + len) > pp->ds_size) {
 124           u_char        *np;
 125
 126           np = realloc(pp->ds, pp->ds_size + len + FUDGE);
 127           if(np == NULL) {
 128                free(str);
 129                //XXX: out of memory!
 130                return -1;
 131           }
 132           pp->ds = np;
 133           pp->ds_size += len + FUDGE;
 134      }
 135      memcpy(pp->ds + pp->ds_len, str, len);
 136      pp->ds_len += len;
 137      free(str);
 138      return len;
 139 }
 140
 141 void
 142 freePDU(pdu_t *pp)
 143 {
 144      if(pp->ahs_size)
 145           free(pp->ahs);
 146      if(pp->ds_size)
 147           free(pp->ds);
 148      bzero(&pp->ipdu, sizeof(union ipdu_u));
 149      pp->ahs = NULL;
 150      pp->ds = NULL;
 151      pp->ahs_size = 0;
 152      pp->ds_size = pp->ds_len = 0;
 153 }
 154
 155 void
 156 pukeText(char *it, pdu_t *pp)
 157 {
 158      char       *ptr;
 159      int        cmd;
 160      size_t     len, n;
 161
 162      len = pp->ds_len;
 163      ptr = (char *)pp->ds;
 164      cmd = pp->ipdu.bhs.opcode;
 165
 166      printf("%s: cmd=0x%x len=%d\n", it, cmd, (int)len);
 167      while(len > 0) {
 168           printf("\t%s\n", ptr);
 169           n = strlen(ptr) + 1;
 170           len -= n;
 171           ptr += n;
 172      }
 173 }