proto_socketpair.c revision 204076
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 204076 2010-02-18 23:16:19Z 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 __unused, void **ctxp __unused) 95{ 96 97 assert(!"proto_server() not supported on socketpairs"); 98 abort(); 99} 100 101static int 102sp_accept(void *ctx __unused, void **newctxp __unused) 103{ 104 105 assert(!"proto_server() not supported on socketpairs"); 106 abort(); 107} 108 109static int 110sp_send(void *ctx, const unsigned char *data, size_t size) 111{ 112 struct sp_ctx *spctx = ctx; 113 int fd; 114 115 assert(spctx != NULL); 116 assert(spctx->sp_magic == SP_CTX_MAGIC); 117 118 switch (spctx->sp_side) { 119 case SP_SIDE_UNDEF: 120 /* 121 * If the first operation done by the caller is proto_send(), 122 * we assume this the client. 123 */ 124 /* FALLTHROUGH */ 125 spctx->sp_side = SP_SIDE_CLIENT; 126 /* Close other end. */ 127 close(spctx->sp_fd[1]); 128 case SP_SIDE_CLIENT: 129 assert(spctx->sp_fd[0] >= 0); 130 fd = spctx->sp_fd[0]; 131 break; 132 case SP_SIDE_SERVER: 133 assert(spctx->sp_fd[1] >= 0); 134 fd = spctx->sp_fd[1]; 135 break; 136 default: 137 abort(); 138 } 139 140 return (proto_common_send(fd, data, size)); 141} 142 143static int 144sp_recv(void *ctx, unsigned char *data, size_t size) 145{ 146 struct sp_ctx *spctx = ctx; 147 int fd; 148 149 assert(spctx != NULL); 150 assert(spctx->sp_magic == SP_CTX_MAGIC); 151 152 switch (spctx->sp_side) { 153 case SP_SIDE_UNDEF: 154 /* 155 * If the first operation done by the caller is proto_recv(), 156 * we assume this the server. 157 */ 158 /* FALLTHROUGH */ 159 spctx->sp_side = SP_SIDE_SERVER; 160 /* Close other end. */ 161 close(spctx->sp_fd[0]); 162 case SP_SIDE_SERVER: 163 assert(spctx->sp_fd[1] >= 0); 164 fd = spctx->sp_fd[1]; 165 break; 166 case SP_SIDE_CLIENT: 167 assert(spctx->sp_fd[0] >= 0); 168 fd = spctx->sp_fd[0]; 169 break; 170 default: 171 abort(); 172 } 173 174 return (proto_common_recv(fd, data, size)); 175} 176 177static int 178sp_descriptor(const void *ctx) 179{ 180 const struct sp_ctx *spctx = ctx; 181 182 assert(spctx != NULL); 183 assert(spctx->sp_magic == SP_CTX_MAGIC); 184 assert(spctx->sp_side == SP_SIDE_CLIENT || 185 spctx->sp_side == SP_SIDE_SERVER); 186 187 switch (spctx->sp_side) { 188 case SP_SIDE_CLIENT: 189 assert(spctx->sp_fd[0] >= 0); 190 return (spctx->sp_fd[0]); 191 case SP_SIDE_SERVER: 192 assert(spctx->sp_fd[1] >= 0); 193 return (spctx->sp_fd[1]); 194 } 195 196 abort(); 197} 198 199static bool 200sp_address_match(const void *ctx __unused, const char *addr __unused) 201{ 202 203 assert(!"proto_address_match() not supported on socketpairs"); 204 abort(); 205} 206 207static void 208sp_local_address(const void *ctx __unused, char *addr __unused, 209 size_t size __unused) 210{ 211 212 assert(!"proto_local_address() not supported on socketpairs"); 213 abort(); 214} 215 216static void 217sp_remote_address(const void *ctx __unused, char *addr __unused, 218 size_t size __unused) 219{ 220 221 assert(!"proto_remote_address() not supported on socketpairs"); 222 abort(); 223} 224 225static void 226sp_close(void *ctx) 227{ 228 struct sp_ctx *spctx = ctx; 229 230 assert(spctx != NULL); 231 assert(spctx->sp_magic == SP_CTX_MAGIC); 232 233 switch (spctx->sp_side) { 234 case SP_SIDE_UNDEF: 235 close(spctx->sp_fd[0]); 236 close(spctx->sp_fd[1]); 237 break; 238 case SP_SIDE_CLIENT: 239 close(spctx->sp_fd[0]); 240 break; 241 case SP_SIDE_SERVER: 242 close(spctx->sp_fd[1]); 243 break; 244 default: 245 abort(); 246 } 247 248 spctx->sp_magic = 0; 249 free(spctx); 250} 251 252static struct hast_proto sp_proto = { 253 .hp_name = "socketpair", 254 .hp_client = sp_client, 255 .hp_connect = sp_connect, 256 .hp_server = sp_server, 257 .hp_accept = sp_accept, 258 .hp_send = sp_send, 259 .hp_recv = sp_recv, 260 .hp_descriptor = sp_descriptor, 261 .hp_address_match = sp_address_match, 262 .hp_local_address = sp_local_address, 263 .hp_remote_address = sp_remote_address, 264 .hp_close = sp_close 265}; 266 267static __constructor void 268sp_ctor(void) 269{ 270 271 proto_register(&sp_proto); 272} 273