1 /*- 2 * Copyright (c) 2009-2010 The FreeBSD Foundation 3 * All rights reserved. 4 * 5 * This software was developed by Pawel Jakub Dawidek under sponsorship from 6 * the FreeBSD Foundation. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include <sys/types.h> 34 #include <sys/queue.h> 35 #include <sys/socket.h> 36 37 #include <assert.h> 38 #include <errno.h> 39 #include <stdint.h> 40 41 #include "proto.h" 42 #include "proto_impl.h" 43 44 #define PROTO_CONN_MAGIC 0x907041c 45 struct proto_conn { 46 int pc_magic; 47 struct hast_proto *pc_proto; 48 void *pc_ctx; 49 int pc_side; 50 #define PROTO_SIDE_CLIENT 0 51 #define PROTO_SIDE_SERVER_LISTEN 1 52 #define PROTO_SIDE_SERVER_WORK 2 53 }; 54 55 static TAILQ_HEAD(, hast_proto) protos = TAILQ_HEAD_INITIALIZER(protos); 56 57 void 58 proto_register(struct hast_proto *proto, bool isdefault) 59 { 60 static bool seen_default = false; 61 62 if (!isdefault) 63 TAILQ_INSERT_HEAD(&protos, proto, hp_next); 64 else { 65 assert(!seen_default); 66 seen_default = true; 67 TAILQ_INSERT_TAIL(&protos, proto, hp_next); 68 } 69 } 70 71 static int 72 proto_common_setup(const char *addr, struct proto_conn **connp, int side) 73 { 74 struct hast_proto *proto; 75 struct proto_conn *conn; 76 void *ctx; 77 int ret; 78 79 assert(side == PROTO_SIDE_CLIENT || side == PROTO_SIDE_SERVER_LISTEN); 80 81 conn = malloc(sizeof(*conn)); 82 if (conn == NULL) 83 return (-1); 84 85 TAILQ_FOREACH(proto, &protos, hp_next) { 86 if (side == PROTO_SIDE_CLIENT) 87 ret = proto->hp_client(addr, &ctx); 88 else /* if (side == PROTO_SIDE_SERVER_LISTEN) */ 89 ret = proto->hp_server(addr, &ctx); 90 /* 91 * ret == 0 - success 92 * ret == -1 - addr is not for this protocol 93 * ret > 0 - right protocol, but an error occured 94 */ 95 if (ret >= 0) 96 break; 97 } 98 if (proto == NULL) { 99 /* Unrecognized address. */ 100 free(conn); 101 errno = EINVAL; 102 return (-1); 103 } 104 if (ret > 0) { 105 /* An error occured. */ 106 free(conn); 107 errno = ret; 108 return (-1); 109 } 110 conn->pc_proto = proto; 111 conn->pc_ctx = ctx; 112 conn->pc_side = side; 113 conn->pc_magic = PROTO_CONN_MAGIC; 114 *connp = conn; 115 return (0); 116 } 117 118 int 119 proto_client(const char *addr, struct proto_conn **connp) 120 { 121 122 return (proto_common_setup(addr, connp, PROTO_SIDE_CLIENT)); 123 } 124 125 int 126 proto_connect(struct proto_conn *conn) 127 { 128 int ret; 129 130 assert(conn != NULL); 131 assert(conn->pc_magic == PROTO_CONN_MAGIC); 132 assert(conn->pc_side == PROTO_SIDE_CLIENT); 133 assert(conn->pc_proto != NULL); 134 135 ret = conn->pc_proto->hp_connect(conn->pc_ctx); 136 if (ret != 0) { 137 errno = ret; 138 return (-1); 139 } 140 141 return (0); 142 } 143 144 int 145 proto_server(const char *addr, struct proto_conn **connp) 146 { 147 148 return (proto_common_setup(addr, connp, PROTO_SIDE_SERVER_LISTEN)); 149 } 150 151 int 152 proto_accept(struct proto_conn *conn, struct proto_conn **newconnp) 153 { 154 struct proto_conn *newconn; 155 int ret; 156 157 assert(conn != NULL); 158 assert(conn->pc_magic == PROTO_CONN_MAGIC); 159 assert(conn->pc_side == PROTO_SIDE_SERVER_LISTEN); 160 assert(conn->pc_proto != NULL); 161 162 newconn = malloc(sizeof(*newconn)); 163 if (newconn == NULL) 164 return (-1); 165 166 ret = conn->pc_proto->hp_accept(conn->pc_ctx, &newconn->pc_ctx); 167 if (ret != 0) { 168 free(newconn); 169 errno = ret; 170 return (-1); 171 } 172 173 newconn->pc_proto = conn->pc_proto; 174 newconn->pc_side = PROTO_SIDE_SERVER_WORK; 175 newconn->pc_magic = PROTO_CONN_MAGIC; 176 *newconnp = newconn; 177 178 return (0); 179 } 180 181 int 182 proto_send(struct proto_conn *conn, const void *data, size_t size) 183 { 184 int ret; 185 186 assert(conn != NULL); 187 assert(conn->pc_magic == PROTO_CONN_MAGIC); 188 assert(conn->pc_proto != NULL); 189 190 ret = conn->pc_proto->hp_send(conn->pc_ctx, data, size); 191 if (ret != 0) { 192 errno = ret; 193 return (-1); 194 } 195 return (0); 196 } 197 198 int 199 proto_recv(struct proto_conn *conn, void *data, size_t size) 200 { 201 int ret; 202 203 assert(conn != NULL); 204 assert(conn->pc_magic == PROTO_CONN_MAGIC); 205 assert(conn->pc_proto != NULL); 206 207 ret = conn->pc_proto->hp_recv(conn->pc_ctx, data, size); 208 if (ret != 0) { 209 errno = ret; 210 return (-1); 211 } 212 return (0); 213 } 214 215 int 216 proto_descriptor(const struct proto_conn *conn) 217 { 218 219 assert(conn != NULL); 220 assert(conn->pc_magic == PROTO_CONN_MAGIC); 221 assert(conn->pc_proto != NULL); 222 223 return (conn->pc_proto->hp_descriptor(conn->pc_ctx)); 224 } 225 226 bool 227 proto_address_match(const struct proto_conn *conn, const char *addr) 228 { 229 230 assert(conn != NULL); 231 assert(conn->pc_magic == PROTO_CONN_MAGIC); 232 assert(conn->pc_proto != NULL); 233 234 return (conn->pc_proto->hp_address_match(conn->pc_ctx, addr)); 235 } 236 237 void 238 proto_local_address(const struct proto_conn *conn, char *addr, size_t size) 239 { 240 241 assert(conn != NULL); 242 assert(conn->pc_magic == PROTO_CONN_MAGIC); 243 assert(conn->pc_proto != NULL); 244 245 conn->pc_proto->hp_local_address(conn->pc_ctx, addr, size); 246 } 247 248 void 249 proto_remote_address(const struct proto_conn *conn, char *addr, size_t size) 250 { 251 252 assert(conn != NULL); 253 assert(conn->pc_magic == PROTO_CONN_MAGIC); 254 assert(conn->pc_proto != NULL); 255 256 conn->pc_proto->hp_remote_address(conn->pc_ctx, addr, size); 257 } 258 259 int 260 proto_timeout(const struct proto_conn *conn, int timeout) 261 { 262 struct timeval tv; 263 int fd; 264 265 assert(conn != NULL); 266 assert(conn->pc_magic == PROTO_CONN_MAGIC); 267 assert(conn->pc_proto != NULL); 268 269 fd = proto_descriptor(conn); 270 if (fd < 0) 271 return (-1); 272 273 tv.tv_sec = timeout; 274 tv.tv_usec = 0; 275 if (setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv)) < 0) 276 return (-1); 277 if (setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv)) < 0) 278 return (-1); 279 280 return (0); 281 } 282 283 void 284 proto_close(struct proto_conn *conn) 285 { 286 287 assert(conn != NULL); 288 assert(conn->pc_magic == PROTO_CONN_MAGIC); 289 assert(conn->pc_proto != NULL); 290 291 conn->pc_proto->hp_close(conn->pc_ctx); 292 conn->pc_magic = 0; 293 free(conn); 294 } 295