pdu.c revision 171568 
1/*-
2 * Copyright (c) 2005 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 171568 2007-07-24 15:35:02Z 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#include "pdu.h"
49
50int
51xmitpdu(isess_t *sess, pdu_t *pp)
52{
53     if(ioctl(sess->fd, ISCSISEND, pp)) {
54	  perror("xmitpdu");
55	  return -1;
56     }
57     if(vflag)
58	  pukeText("I-", pp);
59
60     return 0;
61}
62
63int
64recvpdu(isess_t *sess, pdu_t *pp)
65{
66     if(ioctl(sess->fd, ISCSIRECV, pp)) {
67	  perror("recvpdu");
68	  return -1;
69     }
70     // XXX: return error if truncated via
71     // the FUDGE factor.
72     if(vflag)
73	  pukeText("T-", pp);
74
75     return 0;
76}
77
78int
79sendPDU(isess_t *sess, pdu_t *pp, handler_t *hdlr)
80{
81     if(xmitpdu(sess, pp))
82	  return 0;
83     if(hdlr) {
84	  int res;
85
86	  pp->ahs_size = 8 * 1024;
87	  if((pp->ahs = malloc(pp->ahs_size)) == NULL) {
88	       fprintf(stderr, "out of mem!");
89	       return -1;
90	  }
91	  pp->ds_size = 0;
92	  if((res = recvpdu(sess, pp)) != 0) {
93	       fprintf(stderr, "recvpdu failed\n");
94	       return res;
95	  }
96	  res = hdlr(sess, pp);
97	  freePDU(pp);
98	  return res;
99     }
100     return 1;
101}
102
103
104#define FUDGE (512 * 8)
105/*
106 | We use the same memory for the response
107 | so make enough room ...
108 | XXX: must find a better way.
109 */
110int
111addText(pdu_t *pp, char *fmt, ...)
112{
113     u_int	len;
114     char	*str;
115     va_list	ap;
116
117     va_start(ap, fmt);
118     len = vasprintf(&str, fmt, ap) + 1;
119     if((pp->ds_len + len) > 0xffffff) {
120	  printf("ds overflow\n");
121	  free(str);
122	  return 0;
123     }
124
125     if((pp->ds_len + len) > pp->ds_size) {
126	  u_char	*np;
127
128	  np = realloc(pp->ds, pp->ds_size + len + FUDGE);
129	  if(np == NULL) {
130	       free(str);
131	       //XXX: out of memory!
132	       return -1;
133	  }
134	  pp->ds = np;
135	  pp->ds_size += len + FUDGE;
136     }
137     memcpy(pp->ds + pp->ds_len, str, len);
138     pp->ds_len += len;
139     free(str);
140     return len;
141}
142
143void
144freePDU(pdu_t *pp)
145{
146     if(pp->ahs_size)
147	  free(pp->ahs);
148     if(pp->ds_size)
149	  free(pp->ds);
150     bzero(&pp->ipdu, sizeof(union ipdu_u));
151     pp->ahs = NULL;
152     pp->ds = NULL;
153     pp->ahs_size = 0;
154     pp->ds_size = pp->ds_len = 0;
155}
156
157void
158pukeText(char *it, pdu_t *pp)
159{
160     char	*ptr;
161     int	cmd;
162     size_t	len, n;
163
164     len = pp->ds_len;
165     ptr = (char *)pp->ds;
166     cmd = pp->ipdu.bhs.opcode;
167
168     printf("%s: cmd=0x%x len=%d\n", it, cmd, (int)len);
169     while(len > 0) {
170	  printf("\t%s\n", ptr);
171	  n = strlen(ptr) + 1;
172	  len -= n;
173	  ptr += n;
174     }
175}
176