2 * SPDX-License-Identifier: BSD-2-Clause
4 * Copyright (c) 2012 The FreeBSD Foundation
6 * This software was developed by Edward Tomasz Napierala under sponsorship
7 * from the FreeBSD Foundation.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 #include <sys/types.h>
40 #include <iscsi_proto.h>
41 #include "libiscsiutil.h"
44 pdu_ahs_length(const struct pdu *pdu)
47 return (pdu->pdu_bhs->bhs_total_ahs_len * 4);
51 pdu_data_segment_length(const struct pdu *pdu)
55 len += pdu->pdu_bhs->bhs_data_segment_len[0];
57 len += pdu->pdu_bhs->bhs_data_segment_len[1];
59 len += pdu->pdu_bhs->bhs_data_segment_len[2];
65 pdu_set_data_segment_length(struct pdu *pdu, uint32_t len)
68 pdu->pdu_bhs->bhs_data_segment_len[2] = len;
69 pdu->pdu_bhs->bhs_data_segment_len[1] = len >> 8;
70 pdu->pdu_bhs->bhs_data_segment_len[0] = len >> 16;
74 pdu_new(struct connection *conn)
78 pdu = calloc(1, sizeof(*pdu));
82 pdu->pdu_bhs = calloc(1, sizeof(*pdu->pdu_bhs));
83 if (pdu->pdu_bhs == NULL)
86 pdu->pdu_connection = conn;
92 pdu_new_response(struct pdu *request)
95 return (pdu_new(request->pdu_connection));
99 pdu_padding(const struct pdu *pdu)
102 if ((pdu->pdu_data_len % 4) != 0)
103 return (4 - (pdu->pdu_data_len % 4));
109 pdu_read(const struct connection *conn, char *data, size_t len)
114 ret = read(conn->conn_socket, data, len);
116 if (conn->conn_ops->timed_out()) {
117 conn->conn_ops->fail(conn,
118 "Login Phase timeout");
119 log_errx(1, "exiting due to timeout");
121 conn->conn_ops->fail(conn, strerror(errno));
123 } else if (ret == 0) {
124 conn->conn_ops->fail(conn, "connection lost");
125 log_errx(1, "read: connection lost");
133 pdu_receive(struct pdu *pdu)
135 struct connection *conn;
139 conn = pdu->pdu_connection;
140 if (conn->conn_use_proxy)
141 return (conn->conn_ops->pdu_receive_proxy(pdu));
143 pdu_read(conn, (char *)pdu->pdu_bhs, sizeof(*pdu->pdu_bhs));
145 len = pdu_ahs_length(pdu);
147 log_errx(1, "protocol error: non-empty AHS");
149 len = pdu_data_segment_length(pdu);
151 if (len > (size_t)conn->conn_max_recv_data_segment_length) {
152 log_errx(1, "protocol error: received PDU "
153 "with DataSegmentLength exceeding %d",
154 conn->conn_max_recv_data_segment_length);
157 pdu->pdu_data_len = len;
158 pdu->pdu_data = malloc(len);
159 if (pdu->pdu_data == NULL)
160 log_err(1, "malloc");
162 pdu_read(conn, (char *)pdu->pdu_data, pdu->pdu_data_len);
164 padding = pdu_padding(pdu);
166 assert(padding < sizeof(dummy));
167 pdu_read(conn, (char *)dummy, padding);
173 pdu_send(struct pdu *pdu)
175 struct connection *conn;
176 ssize_t ret, total_len;
182 conn = pdu->pdu_connection;
183 if (conn->conn_use_proxy)
184 return (conn->conn_ops->pdu_send_proxy(pdu));
186 pdu_set_data_segment_length(pdu, pdu->pdu_data_len);
187 iov[0].iov_base = pdu->pdu_bhs;
188 iov[0].iov_len = sizeof(*pdu->pdu_bhs);
189 total_len = iov[0].iov_len;
192 if (pdu->pdu_data_len > 0) {
193 iov[1].iov_base = pdu->pdu_data;
194 iov[1].iov_len = pdu->pdu_data_len;
195 total_len += iov[1].iov_len;
198 padding = pdu_padding(pdu);
200 assert(padding < sizeof(zero));
201 iov[2].iov_base = &zero;
202 iov[2].iov_len = padding;
203 total_len += iov[2].iov_len;
208 ret = writev(conn->conn_socket, iov, iovcnt);
210 if (conn->conn_ops->timed_out())
211 log_errx(1, "exiting due to timeout");
212 log_err(1, "writev");
214 if (ret != total_len)
215 log_errx(1, "short write");
219 pdu_delete(struct pdu *pdu)