proto_socketpair.c revision 204177
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: head/sbin/hastd/proto_socketpair.c 204177 2010-02-21 19:56:47Z pjd $"); 32 33#include <sys/types.h> 34#include <sys/socket.h> 35 36#include <assert.h> 37#include <errno.h> 38#include <stdbool.h> 39#include <stdint.h> 40#include <stdio.h> 41#include <string.h> 42#include <unistd.h> 43 44#include "hast.h" 45#include "proto_impl.h" 46 47#define SP_CTX_MAGIC 0x50c3741 48struct sp_ctx { 49 int sp_magic; 50 int sp_fd[2]; 51 int sp_side; 52#define SP_SIDE_UNDEF 0 53#define SP_SIDE_CLIENT 1 54#define SP_SIDE_SERVER 2 55}; 56 57static void sp_close(void *ctx); 58 59static int 60sp_client(const char *addr, void **ctxp) 61{ 62 struct sp_ctx *spctx; 63 int ret; 64 65 if (strcmp(addr, "socketpair://") != 0) 66 return (-1); 67 68 spctx = malloc(sizeof(*spctx)); 69 if (spctx == NULL) 70 return (errno); 71 72 if (socketpair(PF_UNIX, SOCK_STREAM, 0, spctx->sp_fd) < 0) { 73 ret = errno; 74 free(spctx); 75 return (ret); 76 } 77 78 spctx->sp_side = SP_SIDE_UNDEF; 79 spctx->sp_magic = SP_CTX_MAGIC; 80 *ctxp = spctx; 81 82 return (0); 83} 84 85static int 86sp_connect(void *ctx __unused) 87{ 88 89 assert(!"proto_connect() not supported on socketpairs"); 90 abort(); 91} 92 93static int 94sp_server(const char *addr, void **ctxp __unused) 95{ 96 97 if (strcmp(addr, "socketpair://") != 0) 98 return (-1); 99 100 assert(!"proto_server() not supported on socketpairs"); 101 abort(); 102} 103 104static int 105sp_accept(void *ctx __unused, void **newctxp __unused) 106{ 107 108 assert(!"proto_server() not supported on socketpairs"); 109 abort(); 110} 111 112static int 113sp_send(void *ctx, const unsigned char *data, size_t size) 114{ 115 struct sp_ctx *spctx = ctx; 116 int fd; 117 118 assert(spctx != NULL); 119 assert(spctx->sp_magic == SP_CTX_MAGIC); 120 121 switch (spctx->sp_side) { 122 case SP_SIDE_UNDEF: 123 /* 124 * If the first operation done by the caller is proto_send(), 125 * we assume this the client. 126 */ 127 /* FALLTHROUGH */ 128 spctx->sp_side = SP_SIDE_CLIENT; 129 /* Close other end. */ 130 close(spctx->sp_fd[1]); 131 case SP_SIDE_CLIENT: 132 assert(spctx->sp_fd[0] >= 0); 133 fd = spctx->sp_fd[0]; 134 break; 135 case SP_SIDE_SERVER: 136 assert(spctx->sp_fd[1] >= 0); 137 fd = spctx->sp_fd[1]; 138 break; 139 default: 140 abort(); 141 } 142 143 return (proto_common_send(fd, data, size)); 144} 145 146static int 147sp_recv(void *ctx, unsigned char *data, size_t size) 148{ 149 struct sp_ctx *spctx = ctx; 150 int fd; 151 152 assert(spctx != NULL); 153 assert(spctx->sp_magic == SP_CTX_MAGIC); 154 155 switch (spctx->sp_side) { 156 case SP_SIDE_UNDEF: 157 /* 158 * If the first operation done by the caller is proto_recv(), 159 * we assume this the server. 160 */ 161 /* FALLTHROUGH */ 162 spctx->sp_side = SP_SIDE_SERVER; 163 /* Close other end. */ 164 close(spctx->sp_fd[0]); 165 case SP_SIDE_SERVER: 166 assert(spctx->sp_fd[1] >= 0); 167 fd = spctx->sp_fd[1]; 168 break; 169 case SP_SIDE_CLIENT: 170 assert(spctx->sp_fd[0] >= 0); 171 fd = spctx->sp_fd[0]; 172 break; 173 default: 174 abort(); 175 } 176 177 return (proto_common_recv(fd, data, size)); 178} 179 180static int 181sp_descriptor(const void *ctx) 182{ 183 const struct sp_ctx *spctx = ctx; 184 185 assert(spctx != NULL); 186 assert(spctx->sp_magic == SP_CTX_MAGIC); 187 assert(spctx->sp_side == SP_SIDE_CLIENT || 188 spctx->sp_side == SP_SIDE_SERVER); 189 190 switch (spctx->sp_side) { 191 case SP_SIDE_CLIENT: 192 assert(spctx->sp_fd[0] >= 0); 193 return (spctx->sp_fd[0]); 194 case SP_SIDE_SERVER: 195 assert(spctx->sp_fd[1] >= 0); 196 return (spctx->sp_fd[1]); 197 } 198 199 abort(); 200} 201 202static bool 203sp_address_match(const void *ctx __unused, const char *addr __unused) 204{ 205 206 assert(!"proto_address_match() not supported on socketpairs"); 207 abort(); 208} 209 210static void 211sp_local_address(const void *ctx __unused, char *addr __unused, 212 size_t size __unused) 213{ 214 215 assert(!"proto_local_address() not supported on socketpairs"); 216 abort(); 217} 218 219static void 220sp_remote_address(const void *ctx __unused, char *addr __unused, 221 size_t size __unused) 222{ 223 224 assert(!"proto_remote_address() not supported on socketpairs"); 225 abort(); 226} 227 228static void 229sp_close(void *ctx) 230{ 231 struct sp_ctx *spctx = ctx; 232 233 assert(spctx != NULL); 234 assert(spctx->sp_magic == SP_CTX_MAGIC); 235 236 switch (spctx->sp_side) { 237 case SP_SIDE_UNDEF: 238 close(spctx->sp_fd[0]); 239 close(spctx->sp_fd[1]); 240 break; 241 case SP_SIDE_CLIENT: 242 close(spctx->sp_fd[0]); 243 break; 244 case SP_SIDE_SERVER: 245 close(spctx->sp_fd[1]); 246 break; 247 default: 248 abort(); 249 } 250 251 spctx->sp_magic = 0; 252 free(spctx); 253} 254 255static struct hast_proto sp_proto = { 256 .hp_name = "socketpair", 257 .hp_client = sp_client, 258 .hp_connect = sp_connect, 259 .hp_server = sp_server, 260 .hp_accept = sp_accept, 261 .hp_send = sp_send, 262 .hp_recv = sp_recv, 263 .hp_descriptor = sp_descriptor, 264 .hp_address_match = sp_address_match, 265 .hp_local_address = sp_local_address, 266 .hp_remote_address = sp_remote_address, 267 .hp_close = sp_close 268}; 269 270static __constructor void 271sp_ctor(void) 272{ 273 274 proto_register(&sp_proto); 275} 276