pdu.c revision 185289 
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__FBSDID("$FreeBSD: head/sbin/iscontrol/pdu.c 185289 2008-11-25 07:17:11Z scottl $");
33
34#include <sys/types.h>
35#include <sys/time.h>
36#include <sys/uio.h>
37#include <sys/ioctl.h>
38#include <unistd.h>
39#include <stdlib.h>
40#include <string.h>
41#include <errno.h>
42#include <stdio.h>
43#include <stdarg.h>
44#include <camlib.h>
45
46#include "iscsi.h"
47#include "iscontrol.h"
48
49int
50xmitpdu(isess_t *sess, pdu_t *pp)
51{
52     if(ioctl(sess->fd, ISCSISEND, pp)) {
53	  perror("xmitpdu");
54	  return -1;
55     }
56     if(vflag)
57	  pukeText("I-", pp);
58
59     return 0;
60}
61
62int
63recvpdu(isess_t *sess, pdu_t *pp)
64{
65     if(ioctl(sess->fd, ISCSIRECV, pp)) {
66	  perror("recvpdu");
67	  return -1;
68     }
69     // XXX: return error if truncated via
70     // the FUDGE factor.
71     if(vflag)
72	  pukeText("T-", pp);
73
74     return 0;
75}
76
77int
78sendPDU(isess_t *sess, pdu_t *pp, handler_t *hdlr)
79{
80     if(xmitpdu(sess, pp))
81	  return 0;
82     if(hdlr) {
83	  int res;
84
85	  pp->ahs_size = 8 * 1024;
86	  if((pp->ahs = malloc(pp->ahs_size)) == NULL) {
87	       fprintf(stderr, "out of mem!");
88	       return -1;
89	  }
90	  pp->ds_size = 0;
91	  if((res = recvpdu(sess, pp)) != 0) {
92	       fprintf(stderr, "recvpdu failed\n");
93	       return res;
94	  }
95	  res = hdlr(sess, pp);
96	  freePDU(pp);
97	  return res;
98     }
99     return 1;
100}
101
102
103#define FUDGE (512 * 8)
104/*
105 | We use the same memory for the response
106 | so make enough room ...
107 | XXX: must find a better way.
108 */
109int
110addText(pdu_t *pp, char *fmt, ...)
111{
112     u_int	len;
113     char	*str;
114     va_list	ap;
115
116     va_start(ap, fmt);
117     len = vasprintf(&str, fmt, ap) + 1;
118     if((pp->ds_len + len) > 0xffffff) {
119	  printf("ds overflow\n");
120	  free(str);
121	  return 0;
122     }
123
124     if((pp->ds_len + len) > pp->ds_size) {
125	  u_char	*np;
126
127	  np = realloc(pp->ds, pp->ds_size + len + FUDGE);
128	  if(np == NULL) {
129	       free(str);
130	       //XXX: out of memory!
131	       return -1;
132	  }
133	  pp->ds = np;
134	  pp->ds_size += len + FUDGE;
135     }
136     memcpy(pp->ds + pp->ds_len, str, len);
137     pp->ds_len += len;
138     free(str);
139     return len;
140}
141
142void
143freePDU(pdu_t *pp)
144{
145     if(pp->ahs_size)
146	  free(pp->ahs);
147     if(pp->ds_size)
148	  free(pp->ds);
149     bzero(&pp->ipdu, sizeof(union ipdu_u));
150     pp->ahs = NULL;
151     pp->ds = NULL;
152     pp->ahs_size = 0;
153     pp->ds_size = pp->ds_len = 0;
154}
155
156void
157pukeText(char *it, pdu_t *pp)
158{
159     char	*ptr;
160     int	cmd;
161     size_t	len, n;
162
163     len = pp->ds_len;
164     ptr = (char *)pp->ds;
165     cmd = pp->ipdu.bhs.opcode;
166
167     printf("%s: cmd=0x%x len=%d\n", it, cmd, (int)len);
168     while(len > 0) {
169	  printf("\t%s\n", ptr);
170	  n = strlen(ptr) + 1;
171	  len -= n;
172	  ptr += n;
173     }
174}
175