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 * 47 isns_req_alloc(void) 48 { 49 struct isns_req *req; 50 51 req = calloc(1, sizeof(struct isns_req)); 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(1, req->ir_buflen); 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 * 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 83 isns_req_free(struct isns_req *req) 84 { 85 86 free(req->ir_buf); 87 free(req); 88 } 89 90 static int 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 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 128 isns_req_add_delim(struct isns_req *req) 129 { 130 131 isns_req_add(req, 0, 0, NULL); 132 } 133 134 void 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 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 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 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 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 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 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