pdu.c revision 211095 
1/*-
2 * Copyright (c) 2005-2010 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 211095 2010-08-09 12:36:36Z des $");
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 <dev/iscsi/initiator/iscsi.h>
47#include "iscontrol.h"
48
49static void	pukeText(char *it, pdu_t *pp);
50
51int
52xmitpdu(isess_t *sess, pdu_t *pp)
53{
54     if(ioctl(sess->fd, ISCSISEND, pp)) {
55	  perror("xmitpdu");
56	  return -1;
57     }
58     if(vflag)
59	  pukeText("I-", pp);
60
61     return 0;
62}
63
64int
65recvpdu(isess_t *sess, pdu_t *pp)
66{
67     if(ioctl(sess->fd, ISCSIRECV, pp)) {
68	  perror("recvpdu");
69	  return -1;
70     }
71     // XXX: return error if truncated via
72     // the FUDGE factor.
73     if(vflag)
74	  pukeText("T-", pp);
75
76     return 0;
77}
78
79int
80sendPDU(isess_t *sess, pdu_t *pp, handler_t *hdlr)
81{
82     if(xmitpdu(sess, pp))
83	  return 0;
84     if(hdlr) {
85	  int res;
86
87	  pp->ahs_size = 8 * 1024;
88	  if((pp->ahs_addr = malloc(pp->ahs_size)) == NULL) {
89	       fprintf(stderr, "out of mem!");
90	       return -1;
91	  }
92	  pp->ds_size = 0;
93	  if((res = recvpdu(sess, pp)) != 0) {
94	       fprintf(stderr, "recvpdu failed\n");
95	       return res;
96	  }
97	  res = hdlr(sess, pp);
98	  freePDU(pp);
99	  return res;
100     }
101     return 1;
102}
103
104
105#define FUDGE (512 * 8)
106/*
107 | We use the same memory for the response
108 | so make enough room ...
109 | XXX: must find a better way.
110 */
111int
112addText(pdu_t *pp, char *fmt, ...)
113{
114     u_int	len;
115     char	*str;
116     va_list	ap;
117
118     va_start(ap, fmt);
119     len = vasprintf(&str, fmt, ap) + 1;
120     if((pp->ds_len + len) > 0xffffff) {
121	  printf("ds overflow\n");
122	  free(str);
123	  return 0;
124     }
125
126     if((pp->ds_len + len) > pp->ds_size) {
127	  u_char	*np;
128
129	  np = realloc(pp->ds_addr, pp->ds_size + len + FUDGE);
130	  if(np == NULL) {
131	       free(str);
132	       //XXX: out of memory!
133	       return -1;
134	  }
135	  pp->ds_addr = np;
136	  pp->ds_size += len + FUDGE;
137     }
138     memcpy(pp->ds_addr + pp->ds_len, str, len);
139     pp->ds_len += len;
140     free(str);
141     return len;
142}
143
144void
145freePDU(pdu_t *pp)
146{
147     if(pp->ahs_size)
148	  free(pp->ahs_addr);
149     if(pp->ds_size)
150	  free(pp->ds_addr);
151     bzero(&pp->ipdu, sizeof(union ipdu_u));
152     pp->ahs_addr = NULL;
153     pp->ds_addr = NULL;
154     pp->ahs_size = 0;
155     pp->ds_size = pp->ds_len = 0;
156}
157
158static void
159pukeText(char *it, pdu_t *pp)
160{
161     char	*ptr;
162     int	cmd;
163     size_t	len, n;
164
165     len = pp->ds_len;
166     ptr = (char *)pp->ds_addr;
167     cmd = pp->ipdu.bhs.opcode;
168
169     printf("%s: cmd=0x%x len=%d\n", it, cmd, (int)len);
170     while(len > 0) {
171	  printf("\t%s\n", ptr);
172	  n = strlen(ptr) + 1;
173	  len -= n;
174	  ptr += n;
175     }
176}
177