deps/hiredis/net.c

   1 /* Extracted from anet.c to work properly with Hiredis error reporting.
   2  *
   3  * Copyright (c) 2006-2011, Salvatore Sanfilippo <antirez at gmail dot com>
   4  * Copyright (c) 2010-2011, Pieter Noordhuis <pcnoordhuis at gmail dot com>
   5  *
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  *   * Redistributions of source code must retain the above copyright notice,
  12  *     this list of conditions and the following disclaimer.
  13  *   * 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  *   * Neither the name of Redis nor the names of its contributors may be used
  17  *     to endorse or promote products derived from this software without
  18  *     specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  21  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  30  * POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include "fmacros.h"
  34 #include <sys/types.h>
  35 #include <sys/socket.h>
  36 #include <sys/select.h>
  37 #include <sys/un.h>
  38 #include <netinet/in.h>
  39 #include <netinet/tcp.h>
  40 #include <arpa/inet.h>
  41 #include <unistd.h>
  42 #include <fcntl.h>
  43 #include <string.h>
  44 #include <netdb.h>
  45 #include <errno.h>
  46 #include <stdarg.h>
  47 #include <stdio.h>
  48
  49 #include "net.h"
  50 #include "sds.h"
  51
  52 /* Defined in hiredis.c */
  53 void __redisSetError(redisContext *c, int type, const char *str);
  54
  55 static void __redisSetErrorFromErrno(redisContext *c, int type, const char *prefix) {
  56     char buf[128];
  57     size_t len = 0;
  58
  59     if (prefix != NULL)
  60         len = snprintf(buf,sizeof(buf),"%s: ",prefix);
  61     strerror_r(errno,buf+len,sizeof(buf)-len);
  62     __redisSetError(c,type,buf);
  63 }
  64
  65 static int redisSetReuseAddr(redisContext *c, int fd) {
  66     int on = 1;
  67     if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) {
  68         __redisSetErrorFromErrno(c,REDIS_ERR_IO,NULL);
  69         close(fd);
  70         return REDIS_ERR;
  71     }
  72     return REDIS_OK;
  73 }
  74
  75 static int redisCreateSocket(redisContext *c, int type) {
  76     int s;
  77     if ((s = socket(type, SOCK_STREAM, 0)) == -1) {
  78         __redisSetErrorFromErrno(c,REDIS_ERR_IO,NULL);
  79         return REDIS_ERR;
  80     }
  81     if (type == AF_INET) {
  82         if (redisSetReuseAddr(c,s) == REDIS_ERR) {
  83             return REDIS_ERR;
  84         }
  85     }
  86     return s;
  87 }
  88
  89 static int redisSetBlocking(redisContext *c, int fd, int blocking) {
  90     int flags;
  91
  92     /* Set the socket nonblocking.
  93      * Note that fcntl(2) for F_GETFL and F_SETFL can't be
  94      * interrupted by a signal. */
  95     if ((flags = fcntl(fd, F_GETFL)) == -1) {
  96         __redisSetErrorFromErrno(c,REDIS_ERR_IO,"fcntl(F_GETFL)");
  97         close(fd);
  98         return REDIS_ERR;
  99     }
 100
 101     if (blocking)
 102         flags &= ~O_NONBLOCK;
 103     else
 104         flags |= O_NONBLOCK;
 105
 106     if (fcntl(fd, F_SETFL, flags) == -1) {
 107         __redisSetErrorFromErrno(c,REDIS_ERR_IO,"fcntl(F_SETFL)");
 108         close(fd);
 109         return REDIS_ERR;
 110     }
 111     return REDIS_OK;
 112 }
 113
 114 static int redisSetTcpNoDelay(redisContext *c, int fd) {
 115     int yes = 1;
 116     if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &yes, sizeof(yes)) == -1) {
 117         __redisSetErrorFromErrno(c,REDIS_ERR_IO,"setsockopt(TCP_NODELAY)");
 118         close(fd);
 119         return REDIS_ERR;
 120     }
 121     return REDIS_OK;
 122 }
 123
 124 static int redisContextWaitReady(redisContext *c, int fd, const struct timeval *timeout) {
 125     struct timeval to;
 126     struct timeval *toptr = NULL;
 127     fd_set wfd;
 128
 129     /* Only use timeout when not NULL. */
 130     if (timeout != NULL) {
 131         to = *timeout;
 132         toptr = &to;
 133     }
 134
 135     if (errno == EINPROGRESS) {
 136         FD_ZERO(&wfd);
 137         FD_SET(fd, &wfd);
 138
 139         if (select(FD_SETSIZE, NULL, &wfd, NULL, toptr) == -1) {
 140             __redisSetErrorFromErrno(c,REDIS_ERR_IO,"select(2)");
 141             close(fd);
 142             return REDIS_ERR;
 143         }
 144
 145         if (!FD_ISSET(fd, &wfd)) {
 146             errno = ETIMEDOUT;
 147             __redisSetErrorFromErrno(c,REDIS_ERR_IO,NULL);
 148             close(fd);
 149             return REDIS_ERR;
 150         }
 151
 152         if (redisCheckSocketError(c, fd) != REDIS_OK)
 153             return REDIS_ERR;
 154
 155         return REDIS_OK;
 156     }
 157
 158     __redisSetErrorFromErrno(c,REDIS_ERR_IO,NULL);
 159     close(fd);
 160     return REDIS_ERR;
 161 }
 162
 163 int redisCheckSocketError(redisContext *c, int fd) {
 164     int err = 0;
 165     socklen_t errlen = sizeof(err);
 166
 167     if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &err, &errlen) == -1) {
 168         __redisSetErrorFromErrno(c,REDIS_ERR_IO,"getsockopt(SO_ERROR)");
 169         close(fd);
 170         return REDIS_ERR;
 171     }
 172
 173     if (err) {
 174         errno = err;
 175         __redisSetErrorFromErrno(c,REDIS_ERR_IO,NULL);
 176         close(fd);
 177         return REDIS_ERR;
 178     }
 179
 180     return REDIS_OK;
 181 }
 182
 183 int redisContextSetTimeout(redisContext *c, struct timeval tv) {
 184     if (setsockopt(c->fd,SOL_SOCKET,SO_RCVTIMEO,&tv,sizeof(tv)) == -1) {
 185         __redisSetErrorFromErrno(c,REDIS_ERR_IO,"setsockopt(SO_RCVTIMEO)");
 186         return REDIS_ERR;
 187     }
 188     if (setsockopt(c->fd,SOL_SOCKET,SO_SNDTIMEO,&tv,sizeof(tv)) == -1) {
 189         __redisSetErrorFromErrno(c,REDIS_ERR_IO,"setsockopt(SO_SNDTIMEO)");
 190         return REDIS_ERR;
 191     }
 192     return REDIS_OK;
 193 }
 194
 195 int redisContextConnectTcp(redisContext *c, const char *addr, int port, struct timeval *timeout) {
 196     int s, rv;
 197     char _port[6];  /* strlen("65535"); */
 198     struct addrinfo hints, *servinfo, *p;
 199     int blocking = (c->flags & REDIS_BLOCK);
 200
 201     snprintf(_port, 6, "%d", port);
 202     memset(&hints,0,sizeof(hints));
 203     hints.ai_family = AF_INET;
 204     hints.ai_socktype = SOCK_STREAM;
 205
 206     if ((rv = getaddrinfo(addr,_port,&hints,&servinfo)) != 0) {
 207         __redisSetError(c,REDIS_ERR_OTHER,gai_strerror(rv));
 208         return REDIS_ERR;
 209     }
 210     for (p = servinfo; p != NULL; p = p->ai_next) {
 211         if ((s = socket(p->ai_family,p->ai_socktype,p->ai_protocol)) == -1)
 212             continue;
 213
 214         if (redisSetBlocking(c,s,0) != REDIS_OK)
 215             goto error;
 216         if (connect(s,p->ai_addr,p->ai_addrlen) == -1) {
 217             if (errno == EHOSTUNREACH) {
 218                 close(s);
 219                 continue;
 220             } else if (errno == EINPROGRESS && !blocking) {
 221                 /* This is ok. */
 222             } else {
 223                 if (redisContextWaitReady(c,s,timeout) != REDIS_OK)
 224                     goto error;
 225             }
 226         }
 227         if (blocking && redisSetBlocking(c,s,1) != REDIS_OK)
 228             goto error;
 229         if (redisSetTcpNoDelay(c,s) != REDIS_OK)
 230             goto error;
 231
 232         c->fd = s;
 233         c->flags |= REDIS_CONNECTED;
 234         rv = REDIS_OK;
 235         goto end;
 236     }
 237     if (p == NULL) {
 238         char buf[128];
 239         snprintf(buf,sizeof(buf),"Can't create socket: %s",strerror(errno));
 240         __redisSetError(c,REDIS_ERR_OTHER,buf);
 241         goto error;
 242     }
 243
 244 error:
 245     rv = REDIS_ERR;
 246 end:
 247     freeaddrinfo(servinfo);
 248     return rv;  // Need to return REDIS_OK if alright
 249 }
 250
 251 int redisContextConnectUnix(redisContext *c, const char *path, struct timeval *timeout) {
 252     int s;
 253     int blocking = (c->flags & REDIS_BLOCK);
 254     struct sockaddr_un sa;
 255
 256     if ((s = redisCreateSocket(c,AF_LOCAL)) < 0)
 257         return REDIS_ERR;
 258     if (redisSetBlocking(c,s,0) != REDIS_OK)
 259         return REDIS_ERR;
 260
 261     sa.sun_family = AF_LOCAL;
 262     strncpy(sa.sun_path,path,sizeof(sa.sun_path)-1);
 263     if (connect(s, (struct sockaddr*)&sa, sizeof(sa)) == -1) {
 264         if (errno == EINPROGRESS && !blocking) {
 265             /* This is ok. */
 266         } else {
 267             if (redisContextWaitReady(c,s,timeout) != REDIS_OK)
 268                 return REDIS_ERR;
 269         }
 270     }
 271
 272     /* Reset socket to be blocking after connect(2). */
 273     if (blocking && redisSetBlocking(c,s,1) != REDIS_OK)
 274         return REDIS_ERR;
 275
 276     c->fd = s;
 277     c->flags |= REDIS_CONNECTED;
 278     return REDIS_OK;
 279 }