1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2014 Alexander Motin <mav@FreeBSD.org>
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 #include <sys/types.h>
31 #include <sys/time.h>
32 #include <sys/socket.h>
33 #include <sys/wait.h>
34 #include <sys/endian.h>
35 #include <netinet/in.h>
36 #include <arpa/inet.h>
37 #include <netdb.h>
38 #include <stdbool.h>
39 #include <stdlib.h>
40 #include <string.h>
41 #include <unistd.h>
42
43 #include "ctld.h"
44 #include "isns.h"
45
46 struct isns_req *
isns_req_alloc(void)47 isns_req_alloc(void)
48 {
49 struct isns_req *req;
50
51 req = calloc(sizeof(struct isns_req), 1);
52 if (req == NULL) {
53 log_err(1, "calloc");
54 return (NULL);
55 }
56 req->ir_buflen = sizeof(struct isns_hdr);
57 req->ir_usedlen = 0;
58 req->ir_buf = calloc(req->ir_buflen, 1);
59 if (req->ir_buf == NULL) {
60 free(req);
61 log_err(1, "calloc");
62 return (NULL);
63 }
64 return (req);
65 }
66
67 struct isns_req *
isns_req_create(uint16_t func,uint16_t flags)68 isns_req_create(uint16_t func, uint16_t flags)
69 {
70 struct isns_req *req;
71 struct isns_hdr *hdr;
72
73 req = isns_req_alloc();
74 req->ir_usedlen = sizeof(struct isns_hdr);
75 hdr = (struct isns_hdr *)req->ir_buf;
76 be16enc(hdr->ih_version, ISNS_VERSION);
77 be16enc(hdr->ih_function, func);
78 be16enc(hdr->ih_flags, flags);
79 return (req);
80 }
81
82 void
isns_req_free(struct isns_req * req)83 isns_req_free(struct isns_req *req)
84 {
85
86 free(req->ir_buf);
87 free(req);
88 }
89
90 static int
isns_req_getspace(struct isns_req * req,uint32_t len)91 isns_req_getspace(struct isns_req *req, uint32_t len)
92 {
93 void *newbuf;
94 int newlen;
95
96 if (req->ir_usedlen + len <= req->ir_buflen)
97 return (0);
98 newlen = 1 << flsl(req->ir_usedlen + len);
99 newbuf = realloc(req->ir_buf, newlen);
100 if (newbuf == NULL) {
101 log_err(1, "realloc");
102 return (1);
103 }
104 req->ir_buf = newbuf;
105 req->ir_buflen = newlen;
106 return (0);
107 }
108
109 void
isns_req_add(struct isns_req * req,uint32_t tag,uint32_t len,const void * value)110 isns_req_add(struct isns_req *req, uint32_t tag, uint32_t len,
111 const void *value)
112 {
113 struct isns_tlv *tlv;
114 uint32_t vlen;
115
116 vlen = len + ((len & 3) ? (4 - (len & 3)) : 0);
117 isns_req_getspace(req, sizeof(*tlv) + vlen);
118 tlv = (struct isns_tlv *)&req->ir_buf[req->ir_usedlen];
119 be32enc(tlv->it_tag, tag);
120 be32enc(tlv->it_length, vlen);
121 memcpy(tlv->it_value, value, len);
122 if (vlen != len)
123 memset(&tlv->it_value[len], 0, vlen - len);
124 req->ir_usedlen += sizeof(*tlv) + vlen;
125 }
126
127 void
isns_req_add_delim(struct isns_req * req)128 isns_req_add_delim(struct isns_req *req)
129 {
130
131 isns_req_add(req, 0, 0, NULL);
132 }
133
134 void
isns_req_add_str(struct isns_req * req,uint32_t tag,const char * value)135 isns_req_add_str(struct isns_req *req, uint32_t tag, const char *value)
136 {
137
138 isns_req_add(req, tag, strlen(value) + 1, value);
139 }
140
141 void
isns_req_add_32(struct isns_req * req,uint32_t tag,uint32_t value)142 isns_req_add_32(struct isns_req *req, uint32_t tag, uint32_t value)
143 {
144 uint32_t beval;
145
146 be32enc(&beval, value);
147 isns_req_add(req, tag, sizeof(value), &beval);
148 }
149
150 void
isns_req_add_addr(struct isns_req * req,uint32_t tag,struct addrinfo * ai)151 isns_req_add_addr(struct isns_req *req, uint32_t tag, struct addrinfo *ai)
152 {
153 struct sockaddr_in *in4;
154 struct sockaddr_in6 *in6;
155 uint8_t buf[16];
156
157 switch (ai->ai_addr->sa_family) {
158 case AF_INET:
159 in4 = (struct sockaddr_in *)(void *)ai->ai_addr;
160 memset(buf, 0, 10);
161 buf[10] = 0xff;
162 buf[11] = 0xff;
163 memcpy(&buf[12], &in4->sin_addr, sizeof(in4->sin_addr));
164 isns_req_add(req, tag, sizeof(buf), buf);
165 break;
166 case AF_INET6:
167 in6 = (struct sockaddr_in6 *)(void *)ai->ai_addr;
168 isns_req_add(req, tag, sizeof(in6->sin6_addr), &in6->sin6_addr);
169 break;
170 default:
171 log_errx(1, "Unsupported address family %d",
172 ai->ai_addr->sa_family);
173 }
174 }
175
176 void
isns_req_add_port(struct isns_req * req,uint32_t tag,struct addrinfo * ai)177 isns_req_add_port(struct isns_req *req, uint32_t tag, struct addrinfo *ai)
178 {
179 struct sockaddr_in *in4;
180 struct sockaddr_in6 *in6;
181 uint32_t buf;
182
183 switch (ai->ai_addr->sa_family) {
184 case AF_INET:
185 in4 = (struct sockaddr_in *)(void *)ai->ai_addr;
186 be32enc(&buf, ntohs(in4->sin_port));
187 isns_req_add(req, tag, sizeof(buf), &buf);
188 break;
189 case AF_INET6:
190 in6 = (struct sockaddr_in6 *)(void *)ai->ai_addr;
191 be32enc(&buf, ntohs(in6->sin6_port));
192 isns_req_add(req, tag, sizeof(buf), &buf);
193 break;
194 default:
195 log_errx(1, "Unsupported address family %d",
196 ai->ai_addr->sa_family);
197 }
198 }
199
200 int
isns_req_send(int s,struct isns_req * req)201 isns_req_send(int s, struct isns_req *req)
202 {
203 struct isns_hdr *hdr;
204 int res;
205
206 hdr = (struct isns_hdr *)req->ir_buf;
207 be16enc(hdr->ih_length, req->ir_usedlen - sizeof(*hdr));
208 be16enc(hdr->ih_flags, be16dec(hdr->ih_flags) |
209 ISNS_FLAG_LAST | ISNS_FLAG_FIRST);
210 be16enc(hdr->ih_transaction, 0);
211 be16enc(hdr->ih_sequence, 0);
212
213 res = write(s, req->ir_buf, req->ir_usedlen);
214 return ((res < 0) ? -1 : 0);
215 }
216
217 int
isns_req_receive(int s,struct isns_req * req)218 isns_req_receive(int s, struct isns_req *req)
219 {
220 struct isns_hdr *hdr;
221 ssize_t res, len;
222
223 req->ir_usedlen = 0;
224 isns_req_getspace(req, sizeof(*hdr));
225 res = read(s, req->ir_buf, sizeof(*hdr));
226 if (res < (ssize_t)sizeof(*hdr))
227 return (-1);
228 req->ir_usedlen = sizeof(*hdr);
229 hdr = (struct isns_hdr *)req->ir_buf;
230 if (be16dec(hdr->ih_version) != ISNS_VERSION)
231 return (-1);
232 if ((be16dec(hdr->ih_flags) & (ISNS_FLAG_LAST | ISNS_FLAG_FIRST)) !=
233 (ISNS_FLAG_LAST | ISNS_FLAG_FIRST))
234 return (-1);
235 len = be16dec(hdr->ih_length);
236 isns_req_getspace(req, len);
237 res = read(s, &req->ir_buf[req->ir_usedlen], len);
238 if (res < len)
239 return (-1);
240 req->ir_usedlen += len;
241 return (0);
242 }
243
244 uint32_t
isns_req_get_status(struct isns_req * req)245 isns_req_get_status(struct isns_req *req)
246 {
247
248 if (req->ir_usedlen < sizeof(struct isns_hdr) + 4)
249 return (-1);
250 return (be32dec(&req->ir_buf[sizeof(struct isns_hdr)]));
251 }
252