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/types.h>
  32 #include <sys/time.h>
  33 #include <sys/uio.h>
  34 #include <sys/ioctl.h>
  35 #include <unistd.h>
  36 #include <stdlib.h>
  37 #include <string.h>
  38 #include <errno.h>
  39 #include <stdio.h>
  40 #include <stdarg.h>
  41 #include <camlib.h>
  42
  43 #include "iscsi.h"
  44 #include "iscontrol.h"
  45
  46 int
  47 xmitpdu(isess_t *sess, pdu_t *pp)
  48 {
  49      if(ioctl(sess->fd, ISCSISEND, pp)) {
  50           perror("xmitpdu");
  51           return -1;
  52      }
  53      if(vflag)
  54           pukeText("I-", pp);
  55
  56      return 0;
  57 }
  58
  59 int
  60 recvpdu(isess_t *sess, pdu_t *pp)
  61 {
  62      if(ioctl(sess->fd, ISCSIRECV, pp)) {
  63           perror("recvpdu");
  64           return -1;
  65      }
  66      // XXX: return error if truncated via
  67      // the FUDGE factor.
  68      if(vflag)
  69           pukeText("T-", pp);
  70
  71      return 0;
  72 }
  73
  74 int
  75 sendPDU(isess_t *sess, pdu_t *pp, handler_t *hdlr)
  76 {
  77      if(xmitpdu(sess, pp))
  78           return 0;
  79      if(hdlr) {
  80           int res;
  81
  82           pp->ahs_size = 8 * 1024;
  83           if((pp->ahs = malloc(pp->ahs_size)) == NULL) {
  84                fprintf(stderr, "out of mem!");
  85                return -1;
  86           }
  87           pp->ds_size = 0;
  88           if((res = recvpdu(sess, pp)) != 0) {
  89                fprintf(stderr, "recvpdu failed\n");
  90                return res;
  91           }
  92           res = hdlr(sess, pp);
  93           freePDU(pp);
  94           return res;
  95      }
  96      return 1;
  97 }
  98
  99
 100 #define FUDGE (512 * 8)
 101 /*
 102  | We use the same memory for the response
 103  | so make enough room ...
 104  | XXX: must find a better way.
 105  */
 106 int
 107 addText(pdu_t *pp, char *fmt, ...)
 108 {
 109      u_int      len;
 110      char       *str;
 111      va_list    ap;
 112
 113      va_start(ap, fmt);
 114      len = vasprintf(&str, fmt, ap) + 1;
 115      if((pp->ds_len + len) > 0xffffff) {
 116           printf("ds overflow\n");
 117           free(str);
 118           return 0;
 119      }
 120
 121      if((pp->ds_len + len) > pp->ds_size) {
 122           u_char        *np;
 123
 124           np = realloc(pp->ds, pp->ds_size + len + FUDGE);
 125           if(np == NULL) {
 126                free(str);
 127                //XXX: out of memory!
 128                return -1;
 129           }
 130           pp->ds = np;
 131           pp->ds_size += len + FUDGE;
 132      }
 133      memcpy(pp->ds + pp->ds_len, str, len);
 134      pp->ds_len += len;
 135      free(str);
 136      return len;
 137 }
 138
 139 void
 140 freePDU(pdu_t *pp)
 141 {
 142      if(pp->ahs_size)
 143           free(pp->ahs);
 144      if(pp->ds_size)
 145           free(pp->ds);
 146      bzero(&pp->ipdu, sizeof(union ipdu_u));
 147      pp->ahs = NULL;
 148      pp->ds = NULL;
 149      pp->ahs_size = 0;
 150      pp->ds_size = pp->ds_len = 0;
 151 }
 152
 153 void
 154 pukeText(char *it, pdu_t *pp)
 155 {
 156      char       *ptr;
 157      int        cmd;
 158      size_t     len, n;
 159
 160      len = pp->ds_len;
 161      ptr = (char *)pp->ds;
 162      cmd = pp->ipdu.bhs.opcode;
 163
 164      printf("%s: cmd=0x%x len=%d\n", it, cmd, (int)len);
 165      while(len > 0) {
 166           printf("\t%s\n", ptr);
 167           n = strlen(ptr) + 1;
 168           len -= n;
 169           ptr += n;
 170      }
 171 }