280 lines
8.4 KiB
C
280 lines
8.4 KiB
C
/* Extracted from anet.c to work properly with Hiredis error reporting.
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*
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* Copyright (c) 2006-2011, Salvatore Sanfilippo <antirez at gmail dot com>
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* Copyright (c) 2010-2011, Pieter Noordhuis <pcnoordhuis at gmail dot com>
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Redis nor the names of its contributors may be used
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* to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "fmacros.h"
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/select.h>
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#include <sys/un.h>
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#include <netinet/in.h>
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#include <netinet/tcp.h>
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#include <arpa/inet.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <string.h>
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#include <netdb.h>
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#include <errno.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include "net.h"
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#include "sds.h"
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/* Defined in hiredis.c */
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void __redisSetError(redisContext *c, int type, const char *str);
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static void __redisSetErrorFromErrno(redisContext *c, int type, const char *prefix) {
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char buf[128];
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size_t len = 0;
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if (prefix != NULL)
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len = snprintf(buf,sizeof(buf),"%s: ",prefix);
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strerror_r(errno,buf+len,sizeof(buf)-len);
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__redisSetError(c,type,buf);
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}
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static int redisSetReuseAddr(redisContext *c, int fd) {
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int on = 1;
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if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) {
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__redisSetErrorFromErrno(c,REDIS_ERR_IO,NULL);
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close(fd);
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return REDIS_ERR;
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}
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return REDIS_OK;
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}
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static int redisCreateSocket(redisContext *c, int type) {
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int s;
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if ((s = socket(type, SOCK_STREAM, 0)) == -1) {
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__redisSetErrorFromErrno(c,REDIS_ERR_IO,NULL);
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return REDIS_ERR;
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}
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if (type == AF_INET) {
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if (redisSetReuseAddr(c,s) == REDIS_ERR) {
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return REDIS_ERR;
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}
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}
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return s;
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}
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static int redisSetBlocking(redisContext *c, int fd, int blocking) {
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int flags;
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/* Set the socket nonblocking.
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* Note that fcntl(2) for F_GETFL and F_SETFL can't be
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* interrupted by a signal. */
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if ((flags = fcntl(fd, F_GETFL)) == -1) {
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__redisSetErrorFromErrno(c,REDIS_ERR_IO,"fcntl(F_GETFL)");
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close(fd);
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return REDIS_ERR;
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}
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if (blocking)
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flags &= ~O_NONBLOCK;
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else
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flags |= O_NONBLOCK;
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if (fcntl(fd, F_SETFL, flags) == -1) {
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__redisSetErrorFromErrno(c,REDIS_ERR_IO,"fcntl(F_SETFL)");
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close(fd);
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return REDIS_ERR;
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}
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return REDIS_OK;
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}
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static int redisSetTcpNoDelay(redisContext *c, int fd) {
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int yes = 1;
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if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &yes, sizeof(yes)) == -1) {
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__redisSetErrorFromErrno(c,REDIS_ERR_IO,"setsockopt(TCP_NODELAY)");
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close(fd);
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return REDIS_ERR;
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}
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return REDIS_OK;
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}
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static int redisContextWaitReady(redisContext *c, int fd, const struct timeval *timeout) {
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struct timeval to;
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struct timeval *toptr = NULL;
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fd_set wfd;
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/* Only use timeout when not NULL. */
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if (timeout != NULL) {
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to = *timeout;
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toptr = &to;
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}
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if (errno == EINPROGRESS) {
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FD_ZERO(&wfd);
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FD_SET(fd, &wfd);
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if (select(FD_SETSIZE, NULL, &wfd, NULL, toptr) == -1) {
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__redisSetErrorFromErrno(c,REDIS_ERR_IO,"select(2)");
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close(fd);
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return REDIS_ERR;
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}
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if (!FD_ISSET(fd, &wfd)) {
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errno = ETIMEDOUT;
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__redisSetErrorFromErrno(c,REDIS_ERR_IO,NULL);
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close(fd);
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return REDIS_ERR;
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}
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if (redisCheckSocketError(c, fd) != REDIS_OK)
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return REDIS_ERR;
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return REDIS_OK;
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}
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__redisSetErrorFromErrno(c,REDIS_ERR_IO,NULL);
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close(fd);
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return REDIS_ERR;
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}
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int redisCheckSocketError(redisContext *c, int fd) {
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int err = 0;
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socklen_t errlen = sizeof(err);
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if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &err, &errlen) == -1) {
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__redisSetErrorFromErrno(c,REDIS_ERR_IO,"getsockopt(SO_ERROR)");
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close(fd);
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return REDIS_ERR;
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}
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if (err) {
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errno = err;
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__redisSetErrorFromErrno(c,REDIS_ERR_IO,NULL);
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close(fd);
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return REDIS_ERR;
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}
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return REDIS_OK;
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}
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int redisContextSetTimeout(redisContext *c, struct timeval tv) {
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if (setsockopt(c->fd,SOL_SOCKET,SO_RCVTIMEO,&tv,sizeof(tv)) == -1) {
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__redisSetErrorFromErrno(c,REDIS_ERR_IO,"setsockopt(SO_RCVTIMEO)");
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return REDIS_ERR;
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}
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if (setsockopt(c->fd,SOL_SOCKET,SO_SNDTIMEO,&tv,sizeof(tv)) == -1) {
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__redisSetErrorFromErrno(c,REDIS_ERR_IO,"setsockopt(SO_SNDTIMEO)");
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return REDIS_ERR;
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}
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return REDIS_OK;
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}
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int redisContextConnectTcp(redisContext *c, const char *addr, int port, struct timeval *timeout) {
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int s, rv;
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char _port[6]; /* strlen("65535"); */
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struct addrinfo hints, *servinfo, *p;
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int blocking = (c->flags & REDIS_BLOCK);
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snprintf(_port, 6, "%d", port);
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memset(&hints,0,sizeof(hints));
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hints.ai_family = AF_INET;
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hints.ai_socktype = SOCK_STREAM;
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if ((rv = getaddrinfo(addr,_port,&hints,&servinfo)) != 0) {
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__redisSetError(c,REDIS_ERR_OTHER,gai_strerror(rv));
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return REDIS_ERR;
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}
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for (p = servinfo; p != NULL; p = p->ai_next) {
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if ((s = socket(p->ai_family,p->ai_socktype,p->ai_protocol)) == -1)
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continue;
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if (redisSetBlocking(c,s,0) != REDIS_OK)
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goto error;
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if (connect(s,p->ai_addr,p->ai_addrlen) == -1) {
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if (errno == EHOSTUNREACH) {
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close(s);
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continue;
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} else if (errno == EINPROGRESS && !blocking) {
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/* This is ok. */
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} else {
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if (redisContextWaitReady(c,s,timeout) != REDIS_OK)
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goto error;
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}
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}
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if (blocking && redisSetBlocking(c,s,1) != REDIS_OK)
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goto error;
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if (redisSetTcpNoDelay(c,s) != REDIS_OK)
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goto error;
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c->fd = s;
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c->flags |= REDIS_CONNECTED;
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rv = REDIS_OK;
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goto end;
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}
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if (p == NULL) {
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char buf[128];
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snprintf(buf,sizeof(buf),"Can't create socket: %s",strerror(errno));
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__redisSetError(c,REDIS_ERR_OTHER,buf);
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goto error;
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}
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error:
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rv = REDIS_ERR;
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end:
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freeaddrinfo(servinfo);
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return rv; // Need to return REDIS_OK if alright
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}
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int redisContextConnectUnix(redisContext *c, const char *path, struct timeval *timeout) {
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int s;
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int blocking = (c->flags & REDIS_BLOCK);
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struct sockaddr_un sa;
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if ((s = redisCreateSocket(c,AF_LOCAL)) < 0)
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return REDIS_ERR;
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if (redisSetBlocking(c,s,0) != REDIS_OK)
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return REDIS_ERR;
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sa.sun_family = AF_LOCAL;
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strncpy(sa.sun_path,path,sizeof(sa.sun_path)-1);
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if (connect(s, (struct sockaddr*)&sa, sizeof(sa)) == -1) {
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if (errno == EINPROGRESS && !blocking) {
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/* This is ok. */
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} else {
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if (redisContextWaitReady(c,s,timeout) != REDIS_OK)
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return REDIS_ERR;
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}
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}
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/* Reset socket to be blocking after connect(2). */
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if (blocking && redisSetBlocking(c,s,1) != REDIS_OK)
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return REDIS_ERR;
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c->fd = s;
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c->flags |= REDIS_CONNECTED;
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return REDIS_OK;
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}
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