Skip to content
This repository
Fetching contributors…

Octocat-spinner-32-eaf2f5

Cannot retrieve contributors at this time

file 271 lines (244 sloc) 8.123 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270
/* anet.c -- Basic TCP socket stuff made a bit less boring
*
* Copyright (c) 2006-2010, Salvatore Sanfilippo <antirez at gmail dot com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Redis nor the names of its contributors may be used
* to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/

#include "fmacros.h"

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <netdb.h>
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>

#include "anet.h"

static void anetSetError(char *err, const char *fmt, ...)
{
    va_list ap;

    if (!err) return;
    va_start(ap, fmt);
    vsnprintf(err, ANET_ERR_LEN, fmt, ap);
    va_end(ap);
}

int anetNonBlock(char *err, int fd)
{
    int flags;

    /* Set the socket nonblocking.
* Note that fcntl(2) for F_GETFL and F_SETFL can't be
* interrupted by a signal. */
    if ((flags = fcntl(fd, F_GETFL)) == -1) {
        anetSetError(err, "fcntl(F_GETFL): %s\n", strerror(errno));
        return ANET_ERR;
    }
    if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1) {
        anetSetError(err, "fcntl(F_SETFL,O_NONBLOCK): %s\n", strerror(errno));
        return ANET_ERR;
    }
    return ANET_OK;
}

int anetTcpNoDelay(char *err, int fd)
{
    int yes = 1;
    if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &yes, sizeof(yes)) == -1)
    {
        anetSetError(err, "setsockopt TCP_NODELAY: %s\n", strerror(errno));
        return ANET_ERR;
    }
    return ANET_OK;
}

int anetSetSendBuffer(char *err, int fd, int buffsize)
{
    if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &buffsize, sizeof(buffsize)) == -1)
    {
        anetSetError(err, "setsockopt SO_SNDBUF: %s\n", strerror(errno));
        return ANET_ERR;
    }
    return ANET_OK;
}

int anetTcpKeepAlive(char *err, int fd)
{
    int yes = 1;
    if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &yes, sizeof(yes)) == -1) {
        anetSetError(err, "setsockopt SO_KEEPALIVE: %s\n", strerror(errno));
        return ANET_ERR;
    }
    return ANET_OK;
}

int anetResolve(char *err, char *host, char *ipbuf)
{
    struct sockaddr_in sa;

    sa.sin_family = AF_INET;
    if (inet_aton(host, &sa.sin_addr) == 0) {
        struct hostent *he;

        he = gethostbyname(host);
        if (he == NULL) {
            anetSetError(err, "can't resolve: %s\n", host);
            return ANET_ERR;
        }
        memcpy(&sa.sin_addr, he->h_addr, sizeof(struct in_addr));
    }
    strcpy(ipbuf,inet_ntoa(sa.sin_addr));
    return ANET_OK;
}

#define ANET_CONNECT_NONE 0
#define ANET_CONNECT_NONBLOCK 1
static int anetTcpGenericConnect(char *err, char *addr, int port, int flags)
{
    int s, on = 1;
    struct sockaddr_in sa;

    if ((s = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
        anetSetError(err, "creating socket: %s\n", strerror(errno));
        return ANET_ERR;
    }
    /* Make sure connection-intensive things like the redis benckmark
* will be able to close/open sockets a zillion of times */
    setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));

    sa.sin_family = AF_INET;
    sa.sin_port = htons(port);
    if (inet_aton(addr, &sa.sin_addr) == 0) {
        struct hostent *he;

        he = gethostbyname(addr);
        if (he == NULL) {
            anetSetError(err, "can't resolve: %s\n", addr);
            close(s);
            return ANET_ERR;
        }
        memcpy(&sa.sin_addr, he->h_addr, sizeof(struct in_addr));
    }
    if (flags & ANET_CONNECT_NONBLOCK) {
        if (anetNonBlock(err,s) != ANET_OK)
            return ANET_ERR;
    }
    if (connect(s, (struct sockaddr*)&sa, sizeof(sa)) == -1) {
        if (errno == EINPROGRESS &&
            flags & ANET_CONNECT_NONBLOCK)
            return s;

        anetSetError(err, "connect: %s\n", strerror(errno));
        close(s);
        return ANET_ERR;
    }
    return s;
}

int anetTcpConnect(char *err, char *addr, int port)
{
    return anetTcpGenericConnect(err,addr,port,ANET_CONNECT_NONE);
}

int anetTcpNonBlockConnect(char *err, char *addr, int port)
{
    return anetTcpGenericConnect(err,addr,port,ANET_CONNECT_NONBLOCK);
}

/* Like read(2) but make sure 'count' is read before to return
* (unless error or EOF condition is encountered) */
int anetRead(int fd, char *buf, int count)
{
    int nread, totlen = 0;
    while(totlen != count) {
        nread = read(fd,buf,count-totlen);
        if (nread == 0) return totlen;
        if (nread == -1) return -1;
        totlen += nread;
        buf += nread;
    }
    return totlen;
}

/* Like write(2) but make sure 'count' is read before to return
* (unless error is encountered) */
int anetWrite(int fd, char *buf, int count)
{
    int nwritten, totlen = 0;
    while(totlen != count) {
        nwritten = write(fd,buf,count-totlen);
        if (nwritten == 0) return totlen;
        if (nwritten == -1) return -1;
        totlen += nwritten;
        buf += nwritten;
    }
    return totlen;
}

int anetTcpServer(char *err, int port, char *bindaddr)
{
    int s, on = 1;
    struct sockaddr_in sa;
    
    if ((s = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
        anetSetError(err, "socket: %s\n", strerror(errno));
        return ANET_ERR;
    }
    if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) {
        anetSetError(err, "setsockopt SO_REUSEADDR: %s\n", strerror(errno));
        close(s);
        return ANET_ERR;
    }
    memset(&sa,0,sizeof(sa));
    sa.sin_family = AF_INET;
    sa.sin_port = htons(port);
    sa.sin_addr.s_addr = htonl(INADDR_ANY);
    if (bindaddr) {
        if (inet_aton(bindaddr, &sa.sin_addr) == 0) {
            anetSetError(err, "Invalid bind address\n");
            close(s);
            return ANET_ERR;
        }
    }
    if (bind(s, (struct sockaddr*)&sa, sizeof(sa)) == -1) {
        anetSetError(err, "bind: %s\n", strerror(errno));
        close(s);
        return ANET_ERR;
    }
    if (listen(s, 511) == -1) { /* the magic 511 constant is from nginx */
        anetSetError(err, "listen: %s\n", strerror(errno));
        close(s);
        return ANET_ERR;
    }
    return s;
}

int anetAccept(char *err, int serversock, char *ip, int *port)
{
    int fd;
    struct sockaddr_in sa;
    unsigned int saLen;

    while(1) {
        saLen = sizeof(sa);
        fd = accept(serversock, (struct sockaddr*)&sa, &saLen);
        if (fd == -1) {
            if (errno == EINTR)
                continue;
            else {
                anetSetError(err, "accept: %s\n", strerror(errno));
                return ANET_ERR;
            }
        }
        break;
    }
    if (ip) strcpy(ip,inet_ntoa(sa.sin_addr));
    if (port) *port = ntohs(sa.sin_port);
    return fd;
}
Something went wrong with that request. Please try again.