1 /*-
2 * Copyright (c) 2014 Alexander Motin <mav@FreeBSD.org>
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 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
30
31 #include <sys/types.h>
32 #include <sys/time.h>
33 #include <sys/socket.h>
34 #include <sys/wait.h>
35 #include <sys/endian.h>
36 #include <netinet/in.h>
37 #include <arpa/inet.h>
38 #include <netdb.h>
39 #include <stdbool.h>
40 #include <stdlib.h>
41 #include <string.h>
42 #include <unistd.h>
43
44 #include "ctld.h"
45 #include "isns.h"
46
47 struct isns_req *
isns_req_alloc(void)48 isns_req_alloc(void)
49 {
50 struct isns_req *req;
51
52 req = calloc(sizeof(struct isns_req), 1);
53 if (req == NULL) {
54 log_err(1, "calloc");
55 return (NULL);
56 }
57 req->ir_buflen = sizeof(struct isns_hdr);
58 req->ir_usedlen = 0;
59 req->ir_buf = calloc(req->ir_buflen, 1);
60 if (req->ir_buf == NULL) {
61 free(req);
62 log_err(1, "calloc");
63 return (NULL);
64 }
65 return (req);
66 }
67
68 struct isns_req *
isns_req_create(uint16_t func,uint16_t flags)69 isns_req_create(uint16_t func, uint16_t flags)
70 {
71 struct isns_req *req;
72 struct isns_hdr *hdr;
73
74 req = isns_req_alloc();
75 req->ir_usedlen = sizeof(struct isns_hdr);
76 hdr = (struct isns_hdr *)req->ir_buf;
77 be16enc(hdr->ih_version, ISNS_VERSION);
78 be16enc(hdr->ih_function, func);
79 be16enc(hdr->ih_flags, flags);
80 return (req);
81 }
82
83 void
isns_req_free(struct isns_req * req)84 isns_req_free(struct isns_req *req)
85 {
86
87 free(req->ir_buf);
88 free(req);
89 }
90
91 static int
isns_req_getspace(struct isns_req * req,uint32_t len)92 isns_req_getspace(struct isns_req *req, uint32_t len)
93 {
94 void *newbuf;
95 int newlen;
96
97 if (req->ir_usedlen + len <= req->ir_buflen)
98 return (0);
99 newlen = 1 << flsl(req->ir_usedlen + len);
100 newbuf = realloc(req->ir_buf, newlen);
101 if (newbuf == NULL) {
102 log_err(1, "realloc");
103 return (1);
104 }
105 req->ir_buf = newbuf;
106 req->ir_buflen = newlen;
107 return (0);
108 }
109
110 void
isns_req_add(struct isns_req * req,uint32_t tag,uint32_t len,const void * value)111 isns_req_add(struct isns_req *req, uint32_t tag, uint32_t len,
112 const void *value)
113 {
114 struct isns_tlv *tlv;
115 uint32_t vlen;
116
117 vlen = len + ((len & 3) ? (4 - (len & 3)) : 0);
118 isns_req_getspace(req, sizeof(*tlv) + vlen);
119 tlv = (struct isns_tlv *)&req->ir_buf[req->ir_usedlen];
120 be32enc(tlv->it_tag, tag);
121 be32enc(tlv->it_length, vlen);
122 memcpy(tlv->it_value, value, len);
123 if (vlen != len)
124 memset(&tlv->it_value[len], 0, vlen - len);
125 req->ir_usedlen += sizeof(*tlv) + vlen;
126 }
127
128 void
isns_req_add_delim(struct isns_req * req)129 isns_req_add_delim(struct isns_req *req)
130 {
131
132 isns_req_add(req, 0, 0, NULL);
133 }
134
135 void
isns_req_add_str(struct isns_req * req,uint32_t tag,const char * value)136 isns_req_add_str(struct isns_req *req, uint32_t tag, const char *value)
137 {
138
139 isns_req_add(req, tag, strlen(value) + 1, value);
140 }
141
142 void
isns_req_add_32(struct isns_req * req,uint32_t tag,uint32_t value)143 isns_req_add_32(struct isns_req *req, uint32_t tag, uint32_t value)
144 {
145 uint32_t beval;
146
147 be32enc(&beval, value);
148 isns_req_add(req, tag, sizeof(value), &beval);
149 }
150
151 void
isns_req_add_addr(struct isns_req * req,uint32_t tag,struct addrinfo * ai)152 isns_req_add_addr(struct isns_req *req, uint32_t tag, struct addrinfo *ai)
153 {
154 struct sockaddr_in *in4;
155 struct sockaddr_in6 *in6;
156 uint8_t buf[16];
157
158 switch (ai->ai_addr->sa_family) {
159 case AF_INET:
160 in4 = (struct sockaddr_in *)(void *)ai->ai_addr;
161 memset(buf, 0, 10);
162 buf[10] = 0xff;
163 buf[11] = 0xff;
164 memcpy(&buf[12], &in4->sin_addr, sizeof(in4->sin_addr));
165 isns_req_add(req, tag, sizeof(buf), buf);
166 break;
167 case AF_INET6:
168 in6 = (struct sockaddr_in6 *)(void *)ai->ai_addr;
169 isns_req_add(req, tag, sizeof(in6->sin6_addr), &in6->sin6_addr);
170 break;
171 default:
172 log_errx(1, "Unsupported address family %d",
173 ai->ai_addr->sa_family);
174 }
175 }
176
177 void
isns_req_add_port(struct isns_req * req,uint32_t tag,struct addrinfo * ai)178 isns_req_add_port(struct isns_req *req, uint32_t tag, struct addrinfo *ai)
179 {
180 struct sockaddr_in *in4;
181 struct sockaddr_in6 *in6;
182 uint32_t buf;
183
184 switch (ai->ai_addr->sa_family) {
185 case AF_INET:
186 in4 = (struct sockaddr_in *)(void *)ai->ai_addr;
187 be32enc(&buf, ntohs(in4->sin_port));
188 isns_req_add(req, tag, sizeof(buf), &buf);
189 break;
190 case AF_INET6:
191 in6 = (struct sockaddr_in6 *)(void *)ai->ai_addr;
192 be32enc(&buf, ntohs(in6->sin6_port));
193 isns_req_add(req, tag, sizeof(buf), &buf);
194 break;
195 default:
196 log_errx(1, "Unsupported address family %d",
197 ai->ai_addr->sa_family);
198 }
199 }
200
201 int
isns_req_send(int s,struct isns_req * req)202 isns_req_send(int s, struct isns_req *req)
203 {
204 struct isns_hdr *hdr;
205 int res;
206
207 hdr = (struct isns_hdr *)req->ir_buf;
208 be16enc(hdr->ih_length, req->ir_usedlen - sizeof(*hdr));
209 be16enc(hdr->ih_flags, be16dec(hdr->ih_flags) |
210 ISNS_FLAG_LAST | ISNS_FLAG_FIRST);
211 be16enc(hdr->ih_transaction, 0);
212 be16enc(hdr->ih_sequence, 0);
213
214 res = write(s, req->ir_buf, req->ir_usedlen);
215 return ((res < 0) ? -1 : 0);
216 }
217
218 int
isns_req_receive(int s,struct isns_req * req)219 isns_req_receive(int s, struct isns_req *req)
220 {
221 struct isns_hdr *hdr;
222 ssize_t res, len;
223
224 req->ir_usedlen = 0;
225 isns_req_getspace(req, sizeof(*hdr));
226 res = read(s, req->ir_buf, sizeof(*hdr));
227 if (res < (ssize_t)sizeof(*hdr))
228 return (-1);
229 req->ir_usedlen = sizeof(*hdr);
230 hdr = (struct isns_hdr *)req->ir_buf;
231 if (be16dec(hdr->ih_version) != ISNS_VERSION)
232 return (-1);
233 if ((be16dec(hdr->ih_flags) & (ISNS_FLAG_LAST | ISNS_FLAG_FIRST)) !=
234 (ISNS_FLAG_LAST | ISNS_FLAG_FIRST))
235 return (-1);
236 len = be16dec(hdr->ih_length);
237 isns_req_getspace(req, len);
238 res = read(s, &req->ir_buf[req->ir_usedlen], len);
239 if (res < len)
240 return (-1);
241 req->ir_usedlen += len;
242 return (0);
243 }
244
245 uint32_t
isns_req_get_status(struct isns_req * req)246 isns_req_get_status(struct isns_req *req)
247 {
248
249 if (req->ir_usedlen < sizeof(struct isns_hdr) + 4)
250 return (-1);
251 return (be32dec(&req->ir_buf[sizeof(struct isns_hdr)]));
252 }
253