| 1 | /* anet.c -- Basic TCP socket stuff made a bit less boring |
| 2 | * |
| 3 | * Copyright (c) 2006-2009, Salvatore Sanfilippo <antirez at gmail dot com> |
| 4 | * All rights reserved. |
| 5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions are met: |
| 8 | * |
| 9 | * * Redistributions of source code must retain the above copyright notice, |
| 10 | * this list of conditions and the following disclaimer. |
| 11 | * * Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
| 14 | * * Neither the name of Redis nor the names of its contributors may be used |
| 15 | * to endorse or promote products derived from this software without |
| 16 | * specific prior written permission. |
| 17 | * |
| 18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| 19 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 21 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| 22 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 23 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 24 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 25 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 26 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 27 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 28 | * POSSIBILITY OF SUCH DAMAGE. |
| 29 | */ |
| 30 | |
| 31 | #include "fmacros.h" |
| 32 | |
| 33 | #include <sys/types.h> |
| 34 | #include <sys/socket.h> |
| 35 | #include <netinet/in.h> |
| 36 | #include <netinet/tcp.h> |
| 37 | #include <arpa/inet.h> |
| 38 | #include <unistd.h> |
| 39 | #include <fcntl.h> |
| 40 | #include <string.h> |
| 41 | #include <netdb.h> |
| 42 | #include <errno.h> |
| 43 | #include <stdarg.h> |
| 44 | #include <stdio.h> |
| 45 | |
| 46 | #include "anet.h" |
| 47 | |
| 48 | static void anetSetError(char *err, const char *fmt, ...) |
| 49 | { |
| 50 | va_list ap; |
| 51 | |
| 52 | if (!err) return; |
| 53 | va_start(ap, fmt); |
| 54 | vsnprintf(err, ANET_ERR_LEN, fmt, ap); |
| 55 | va_end(ap); |
| 56 | } |
| 57 | |
| 58 | int anetNonBlock(char *err, int fd) |
| 59 | { |
| 60 | int flags; |
| 61 | |
| 62 | /* Set the socket nonblocking. |
| 63 | * Note that fcntl(2) for F_GETFL and F_SETFL can't be |
| 64 | * interrupted by a signal. */ |
| 65 | if ((flags = fcntl(fd, F_GETFL)) == -1) { |
| 66 | anetSetError(err, "fcntl(F_GETFL): %s\n", strerror(errno)); |
| 67 | return ANET_ERR; |
| 68 | } |
| 69 | if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1) { |
| 70 | anetSetError(err, "fcntl(F_SETFL,O_NONBLOCK): %s\n", strerror(errno)); |
| 71 | return ANET_ERR; |
| 72 | } |
| 73 | return ANET_OK; |
| 74 | } |
| 75 | |
| 76 | int anetTcpNoDelay(char *err, int fd) |
| 77 | { |
| 78 | int yes = 1; |
| 79 | if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &yes, sizeof(yes)) == -1) |
| 80 | { |
| 81 | anetSetError(err, "setsockopt TCP_NODELAY: %s\n", strerror(errno)); |
| 82 | return ANET_ERR; |
| 83 | } |
| 84 | return ANET_OK; |
| 85 | } |
| 86 | |
| 87 | int anetSetSendBuffer(char *err, int fd, int buffsize) |
| 88 | { |
| 89 | if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &buffsize, sizeof(buffsize)) == -1) |
| 90 | { |
| 91 | anetSetError(err, "setsockopt SO_SNDBUF: %s\n", strerror(errno)); |
| 92 | return ANET_ERR; |
| 93 | } |
| 94 | return ANET_OK; |
| 95 | } |
| 96 | |
| 97 | int anetTcpKeepAlive(char *err, int fd) |
| 98 | { |
| 99 | int yes = 1; |
| 100 | if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &yes, sizeof(yes)) == -1) { |
| 101 | anetSetError(err, "setsockopt SO_KEEPALIVE: %s\n", strerror(errno)); |
| 102 | return ANET_ERR; |
| 103 | } |
| 104 | return ANET_OK; |
| 105 | } |
| 106 | |
| 107 | int anetResolve(char *err, char *host, char *ipbuf) |
| 108 | { |
| 109 | struct sockaddr_in sa; |
| 110 | |
| 111 | sa.sin_family = AF_INET; |
| 112 | if (inet_aton(host, &sa.sin_addr) == 0) { |
| 113 | struct hostent *he; |
| 114 | |
| 115 | he = gethostbyname(host); |
| 116 | if (he == NULL) { |
| 117 | anetSetError(err, "can't resolve: %s\n", host); |
| 118 | return ANET_ERR; |
| 119 | } |
| 120 | memcpy(&sa.sin_addr, he->h_addr, sizeof(struct in_addr)); |
| 121 | } |
| 122 | strcpy(ipbuf,inet_ntoa(sa.sin_addr)); |
| 123 | return ANET_OK; |
| 124 | } |
| 125 | |
| 126 | #define ANET_CONNECT_NONE 0 |
| 127 | #define ANET_CONNECT_NONBLOCK 1 |
| 128 | static int anetTcpGenericConnect(char *err, char *addr, int port, int flags) |
| 129 | { |
| 130 | int s, on = 1; |
| 131 | struct sockaddr_in sa; |
| 132 | |
| 133 | if ((s = socket(AF_INET, SOCK_STREAM, 0)) == -1) { |
| 134 | anetSetError(err, "creating socket: %s\n", strerror(errno)); |
| 135 | return ANET_ERR; |
| 136 | } |
| 137 | /* Make sure connection-intensive things like the redis benckmark |
| 138 | * will be able to close/open sockets a zillion of times */ |
| 139 | setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); |
| 140 | |
| 141 | sa.sin_family = AF_INET; |
| 142 | sa.sin_port = htons(port); |
| 143 | if (inet_aton(addr, &sa.sin_addr) == 0) { |
| 144 | struct hostent *he; |
| 145 | |
| 146 | he = gethostbyname(addr); |
| 147 | if (he == NULL) { |
| 148 | anetSetError(err, "can't resolve: %s\n", addr); |
| 149 | close(s); |
| 150 | return ANET_ERR; |
| 151 | } |
| 152 | memcpy(&sa.sin_addr, he->h_addr, sizeof(struct in_addr)); |
| 153 | } |
| 154 | if (flags & ANET_CONNECT_NONBLOCK) { |
| 155 | if (anetNonBlock(err,s) != ANET_OK) |
| 156 | return ANET_ERR; |
| 157 | } |
| 158 | if (connect(s, (struct sockaddr*)&sa, sizeof(sa)) == -1) { |
| 159 | if (errno == EINPROGRESS && |
| 160 | flags & ANET_CONNECT_NONBLOCK) |
| 161 | return s; |
| 162 | |
| 163 | anetSetError(err, "connect: %s\n", strerror(errno)); |
| 164 | close(s); |
| 165 | return ANET_ERR; |
| 166 | } |
| 167 | return s; |
| 168 | } |
| 169 | |
| 170 | int anetTcpConnect(char *err, char *addr, int port) |
| 171 | { |
| 172 | return anetTcpGenericConnect(err,addr,port,ANET_CONNECT_NONE); |
| 173 | } |
| 174 | |
| 175 | int anetTcpNonBlockConnect(char *err, char *addr, int port) |
| 176 | { |
| 177 | return anetTcpGenericConnect(err,addr,port,ANET_CONNECT_NONBLOCK); |
| 178 | } |
| 179 | |
| 180 | /* Like read(2) but make sure 'count' is read before to return |
| 181 | * (unless error or EOF condition is encountered) */ |
| 182 | int anetRead(int fd, char *buf, int count) |
| 183 | { |
| 184 | int nread, totlen = 0; |
| 185 | while(totlen != count) { |
| 186 | nread = read(fd,buf,count-totlen); |
| 187 | if (nread == 0) return totlen; |
| 188 | if (nread == -1) return -1; |
| 189 | totlen += nread; |
| 190 | buf += nread; |
| 191 | } |
| 192 | return totlen; |
| 193 | } |
| 194 | |
| 195 | /* Like write(2) but make sure 'count' is read before to return |
| 196 | * (unless error is encountered) */ |
| 197 | int anetWrite(int fd, char *buf, int count) |
| 198 | { |
| 199 | int nwritten, totlen = 0; |
| 200 | while(totlen != count) { |
| 201 | nwritten = write(fd,buf,count-totlen); |
| 202 | if (nwritten == 0) return totlen; |
| 203 | if (nwritten == -1) return -1; |
| 204 | totlen += nwritten; |
| 205 | buf += nwritten; |
| 206 | } |
| 207 | return totlen; |
| 208 | } |
| 209 | |
| 210 | int anetTcpServer(char *err, int port, char *bindaddr) |
| 211 | { |
| 212 | int s, on = 1; |
| 213 | struct sockaddr_in sa; |
| 214 | |
| 215 | if ((s = socket(AF_INET, SOCK_STREAM, 0)) == -1) { |
| 216 | anetSetError(err, "socket: %s\n", strerror(errno)); |
| 217 | return ANET_ERR; |
| 218 | } |
| 219 | if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) { |
| 220 | anetSetError(err, "setsockopt SO_REUSEADDR: %s\n", strerror(errno)); |
| 221 | close(s); |
| 222 | return ANET_ERR; |
| 223 | } |
| 224 | memset(&sa,0,sizeof(sa)); |
| 225 | sa.sin_family = AF_INET; |
| 226 | sa.sin_port = htons(port); |
| 227 | sa.sin_addr.s_addr = htonl(INADDR_ANY); |
| 228 | if (bindaddr) { |
| 229 | if (inet_aton(bindaddr, &sa.sin_addr) == 0) { |
| 230 | anetSetError(err, "Invalid bind address\n"); |
| 231 | close(s); |
| 232 | return ANET_ERR; |
| 233 | } |
| 234 | } |
| 235 | if (bind(s, (struct sockaddr*)&sa, sizeof(sa)) == -1) { |
| 236 | anetSetError(err, "bind: %s\n", strerror(errno)); |
| 237 | close(s); |
| 238 | return ANET_ERR; |
| 239 | } |
| 240 | if (listen(s, 32) == -1) { |
| 241 | anetSetError(err, "listen: %s\n", strerror(errno)); |
| 242 | close(s); |
| 243 | return ANET_ERR; |
| 244 | } |
| 245 | return s; |
| 246 | } |
| 247 | |
| 248 | int anetAccept(char *err, int serversock, char *ip, int *port) |
| 249 | { |
| 250 | int fd; |
| 251 | struct sockaddr_in sa; |
| 252 | unsigned int saLen; |
| 253 | |
| 254 | while(1) { |
| 255 | saLen = sizeof(sa); |
| 256 | fd = accept(serversock, (struct sockaddr*)&sa, &saLen); |
| 257 | if (fd == -1) { |
| 258 | if (errno == EINTR) |
| 259 | continue; |
| 260 | else { |
| 261 | anetSetError(err, "accept: %s\n", strerror(errno)); |
| 262 | return ANET_ERR; |
| 263 | } |
| 264 | } |
| 265 | break; |
| 266 | } |
| 267 | if (ip) strcpy(ip,inet_ntoa(sa.sin_addr)); |
| 268 | if (port) *port = ntohs(sa.sin_port); |
| 269 | return fd; |
| 270 | } |