pdu.c revision 330449 
1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2005-2010 Daniel Braniss <danny@cs.huji.ac.il>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 */
29/*
30 | $Id: pdu.c,v 2.2 2006/12/01 09:11:56 danny Exp danny $
31 */
32
33#include <sys/cdefs.h>
34__FBSDID("$FreeBSD: stable/11/sbin/iscontrol/pdu.c 330449 2018-03-05 07:26:05Z eadler $");
35
36#include <sys/types.h>
37#include <sys/time.h>
38#include <sys/uio.h>
39#include <sys/ioctl.h>
40#include <unistd.h>
41#include <stdlib.h>
42#include <string.h>
43#include <errno.h>
44#include <stdio.h>
45#include <stdarg.h>
46#include <camlib.h>
47
48#include <dev/iscsi_initiator/iscsi.h>
49#include "iscontrol.h"
50
51static void	pukeText(char *it, pdu_t *pp);
52
53int
54xmitpdu(isess_t *sess, pdu_t *pp)
55{
56     if(ioctl(sess->fd, ISCSISEND, pp)) {
57	  perror("xmitpdu");
58	  return -1;
59     }
60     if(vflag)
61	  pukeText("I-", pp);
62
63     return 0;
64}
65
66int
67recvpdu(isess_t *sess, pdu_t *pp)
68{
69     if(ioctl(sess->fd, ISCSIRECV, pp)) {
70	  perror("recvpdu");
71	  return -1;
72     }
73     // XXX: return error if truncated via
74     // the FUDGE factor.
75     if(vflag)
76	  pukeText("T-", pp);
77
78     return 0;
79}
80
81int
82sendPDU(isess_t *sess, pdu_t *pp, handler_t *hdlr)
83{
84     if(xmitpdu(sess, pp))
85	  return 0;
86     if(hdlr) {
87	  int res;
88
89	  pp->ahs_size = 8 * 1024;
90	  if((pp->ahs_addr = malloc(pp->ahs_size)) == NULL) {
91	       fprintf(stderr, "out of mem!");
92	       return -1;
93	  }
94	  pp->ds_size = 0;
95	  if((res = recvpdu(sess, pp)) != 0) {
96	       fprintf(stderr, "recvpdu failed\n");
97	       return res;
98	  }
99	  res = hdlr(sess, pp);
100	  freePDU(pp);
101	  return res;
102     }
103     return 1;
104}
105
106
107#define FUDGE (512 * 8)
108/*
109 | We use the same memory for the response
110 | so make enough room ...
111 | XXX: must find a better way.
112 */
113int
114addText(pdu_t *pp, char *fmt, ...)
115{
116     u_int	len;
117     char	*str;
118     va_list	ap;
119
120     va_start(ap, fmt);
121     len = vasprintf(&str, fmt, ap) + 1;
122     if((pp->ds_len + len) > 0xffffff) {
123	  printf("ds overflow\n");
124	  free(str);
125	  return 0;
126     }
127
128     if((pp->ds_len + len) > pp->ds_size) {
129	  u_char	*np;
130
131	  np = realloc(pp->ds_addr, pp->ds_size + len + FUDGE);
132	  if(np == NULL) {
133	       free(str);
134	       //XXX: out of memory!
135	       return -1;
136	  }
137	  pp->ds_addr = np;
138	  pp->ds_size += len + FUDGE;
139     }
140     memcpy(pp->ds_addr + pp->ds_len, str, len);
141     pp->ds_len += len;
142     free(str);
143     return len;
144}
145
146void
147freePDU(pdu_t *pp)
148{
149     if(pp->ahs_size)
150	  free(pp->ahs_addr);
151     if(pp->ds_size)
152	  free(pp->ds_addr);
153     bzero(&pp->ipdu, sizeof(union ipdu_u));
154     pp->ahs_addr = NULL;
155     pp->ds_addr = NULL;
156     pp->ahs_size = 0;
157     pp->ds_size = pp->ds_len = 0;
158}
159
160static void
161pukeText(char *it, pdu_t *pp)
162{
163     char	*ptr;
164     int	cmd;
165     size_t	len, n;
166
167     len = pp->ds_len;
168     ptr = (char *)pp->ds_addr;
169     cmd = pp->ipdu.bhs.opcode;
170
171     printf("%s: cmd=0x%x len=%d\n", it, cmd, (int)len);
172     while(len > 0) {
173	  printf("\t%s\n", ptr);
174	  n = strlen(ptr) + 1;
175	  len -= n;
176	  ptr += n;
177     }
178}
179