1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2014 Alexander Motin <[email protected]>
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/cdefs.h>
31 __FBSDID("$FreeBSD$");
32
33 #include <sys/types.h>
34 #include <sys/time.h>
35 #include <sys/socket.h>
36 #include <sys/wait.h>
37 #include <sys/endian.h>
38 #include <netinet/in.h>
39 #include <arpa/inet.h>
40 #include <netdb.h>
41 #include <stdbool.h>
42 #include <stdlib.h>
43 #include <string.h>
44 #include <unistd.h>
45
46 #include "ctld.h"
47 #include "isns.h"
48
49 struct isns_req *
isns_req_alloc(void)50 isns_req_alloc(void)
51 {
52 struct isns_req *req;
53
54 req = calloc(sizeof(struct isns_req), 1);
55 if (req == NULL) {
56 log_err(1, "calloc");
57 return (NULL);
58 }
59 req->ir_buflen = sizeof(struct isns_hdr);
60 req->ir_usedlen = 0;
61 req->ir_buf = calloc(req->ir_buflen, 1);
62 if (req->ir_buf == NULL) {
63 free(req);
64 log_err(1, "calloc");
65 return (NULL);
66 }
67 return (req);
68 }
69
70 struct isns_req *
isns_req_create(uint16_t func,uint16_t flags)71 isns_req_create(uint16_t func, uint16_t flags)
72 {
73 struct isns_req *req;
74 struct isns_hdr *hdr;
75
76 req = isns_req_alloc();
77 req->ir_usedlen = sizeof(struct isns_hdr);
78 hdr = (struct isns_hdr *)req->ir_buf;
79 be16enc(hdr->ih_version, ISNS_VERSION);
80 be16enc(hdr->ih_function, func);
81 be16enc(hdr->ih_flags, flags);
82 return (req);
83 }
84
85 void
isns_req_free(struct isns_req * req)86 isns_req_free(struct isns_req *req)
87 {
88
89 free(req->ir_buf);
90 free(req);
91 }
92
93 static int
isns_req_getspace(struct isns_req * req,uint32_t len)94 isns_req_getspace(struct isns_req *req, uint32_t len)
95 {
96 void *newbuf;
97 int newlen;
98
99 if (req->ir_usedlen + len <= req->ir_buflen)
100 return (0);
101 newlen = 1 << flsl(req->ir_usedlen + len);
102 newbuf = realloc(req->ir_buf, newlen);
103 if (newbuf == NULL) {
104 log_err(1, "realloc");
105 return (1);
106 }
107 req->ir_buf = newbuf;
108 req->ir_buflen = newlen;
109 return (0);
110 }
111
112 void
isns_req_add(struct isns_req * req,uint32_t tag,uint32_t len,const void * value)113 isns_req_add(struct isns_req *req, uint32_t tag, uint32_t len,
114 const void *value)
115 {
116 struct isns_tlv *tlv;
117 uint32_t vlen;
118
119 vlen = len + ((len & 3) ? (4 - (len & 3)) : 0);
120 isns_req_getspace(req, sizeof(*tlv) + vlen);
121 tlv = (struct isns_tlv *)&req->ir_buf[req->ir_usedlen];
122 be32enc(tlv->it_tag, tag);
123 be32enc(tlv->it_length, vlen);
124 memcpy(tlv->it_value, value, len);
125 if (vlen != len)
126 memset(&tlv->it_value[len], 0, vlen - len);
127 req->ir_usedlen += sizeof(*tlv) + vlen;
128 }
129
130 void
isns_req_add_delim(struct isns_req * req)131 isns_req_add_delim(struct isns_req *req)
132 {
133
134 isns_req_add(req, 0, 0, NULL);
135 }
136
137 void
isns_req_add_str(struct isns_req * req,uint32_t tag,const char * value)138 isns_req_add_str(struct isns_req *req, uint32_t tag, const char *value)
139 {
140
141 isns_req_add(req, tag, strlen(value) + 1, value);
142 }
143
144 void
isns_req_add_32(struct isns_req * req,uint32_t tag,uint32_t value)145 isns_req_add_32(struct isns_req *req, uint32_t tag, uint32_t value)
146 {
147 uint32_t beval;
148
149 be32enc(&beval, value);
150 isns_req_add(req, tag, sizeof(value), &beval);
151 }
152
153 void
isns_req_add_addr(struct isns_req * req,uint32_t tag,struct addrinfo * ai)154 isns_req_add_addr(struct isns_req *req, uint32_t tag, struct addrinfo *ai)
155 {
156 struct sockaddr_in *in4;
157 struct sockaddr_in6 *in6;
158 uint8_t buf[16];
159
160 switch (ai->ai_addr->sa_family) {
161 case AF_INET:
162 in4 = (struct sockaddr_in *)(void *)ai->ai_addr;
163 memset(buf, 0, 10);
164 buf[10] = 0xff;
165 buf[11] = 0xff;
166 memcpy(&buf[12], &in4->sin_addr, sizeof(in4->sin_addr));
167 isns_req_add(req, tag, sizeof(buf), buf);
168 break;
169 case AF_INET6:
170 in6 = (struct sockaddr_in6 *)(void *)ai->ai_addr;
171 isns_req_add(req, tag, sizeof(in6->sin6_addr), &in6->sin6_addr);
172 break;
173 default:
174 log_errx(1, "Unsupported address family %d",
175 ai->ai_addr->sa_family);
176 }
177 }
178
179 void
isns_req_add_port(struct isns_req * req,uint32_t tag,struct addrinfo * ai)180 isns_req_add_port(struct isns_req *req, uint32_t tag, struct addrinfo *ai)
181 {
182 struct sockaddr_in *in4;
183 struct sockaddr_in6 *in6;
184 uint32_t buf;
185
186 switch (ai->ai_addr->sa_family) {
187 case AF_INET:
188 in4 = (struct sockaddr_in *)(void *)ai->ai_addr;
189 be32enc(&buf, ntohs(in4->sin_port));
190 isns_req_add(req, tag, sizeof(buf), &buf);
191 break;
192 case AF_INET6:
193 in6 = (struct sockaddr_in6 *)(void *)ai->ai_addr;
194 be32enc(&buf, ntohs(in6->sin6_port));
195 isns_req_add(req, tag, sizeof(buf), &buf);
196 break;
197 default:
198 log_errx(1, "Unsupported address family %d",
199 ai->ai_addr->sa_family);
200 }
201 }
202
203 int
isns_req_send(int s,struct isns_req * req)204 isns_req_send(int s, struct isns_req *req)
205 {
206 struct isns_hdr *hdr;
207 int res;
208
209 hdr = (struct isns_hdr *)req->ir_buf;
210 be16enc(hdr->ih_length, req->ir_usedlen - sizeof(*hdr));
211 be16enc(hdr->ih_flags, be16dec(hdr->ih_flags) |
212 ISNS_FLAG_LAST | ISNS_FLAG_FIRST);
213 be16enc(hdr->ih_transaction, 0);
214 be16enc(hdr->ih_sequence, 0);
215
216 res = write(s, req->ir_buf, req->ir_usedlen);
217 return ((res < 0) ? -1 : 0);
218 }
219
220 int
isns_req_receive(int s,struct isns_req * req)221 isns_req_receive(int s, struct isns_req *req)
222 {
223 struct isns_hdr *hdr;
224 ssize_t res, len;
225
226 req->ir_usedlen = 0;
227 isns_req_getspace(req, sizeof(*hdr));
228 res = read(s, req->ir_buf, sizeof(*hdr));
229 if (res < (ssize_t)sizeof(*hdr))
230 return (-1);
231 req->ir_usedlen = sizeof(*hdr);
232 hdr = (struct isns_hdr *)req->ir_buf;
233 if (be16dec(hdr->ih_version) != ISNS_VERSION)
234 return (-1);
235 if ((be16dec(hdr->ih_flags) & (ISNS_FLAG_LAST | ISNS_FLAG_FIRST)) !=
236 (ISNS_FLAG_LAST | ISNS_FLAG_FIRST))
237 return (-1);
238 len = be16dec(hdr->ih_length);
239 isns_req_getspace(req, len);
240 res = read(s, &req->ir_buf[req->ir_usedlen], len);
241 if (res < len)
242 return (-1);
243 req->ir_usedlen += len;
244 return (0);
245 }
246
247 uint32_t
isns_req_get_status(struct isns_req * req)248 isns_req_get_status(struct isns_req *req)
249 {
250
251 if (req->ir_usedlen < sizeof(struct isns_hdr) + 4)
252 return (-1);
253 return (be32dec(&req->ir_buf[sizeof(struct isns_hdr)]));
254 }
255