mirror of
http://github.com/valkey-io/valkey
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613 lines
19 KiB
C
613 lines
19 KiB
C
/* Extracted from anet.c to work properly with Hiredis error reporting.
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*
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* Copyright (c) 2009-2011, Salvatore Sanfilippo <antirez at gmail dot com>
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* Copyright (c) 2010-2014, Pieter Noordhuis <pcnoordhuis at gmail dot com>
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* Copyright (c) 2015, Matt Stancliff <matt at genges dot com>,
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* Jan-Erik Rediger <janerik at fnordig 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 <fcntl.h>
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#include <string.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 <limits.h>
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#include <stdlib.h>
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#include "net.h"
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#include "sds.h"
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#include "sockcompat.h"
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#include "win32.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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void redisNetClose(redisContext *c) {
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if (c && c->fd != REDIS_INVALID_FD) {
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close(c->fd);
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c->fd = REDIS_INVALID_FD;
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}
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}
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ssize_t redisNetRead(redisContext *c, char *buf, size_t bufcap) {
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ssize_t nread = recv(c->fd, buf, bufcap, 0);
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if (nread == -1) {
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if ((errno == EWOULDBLOCK && !(c->flags & REDIS_BLOCK)) || (errno == EINTR)) {
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/* Try again later */
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return 0;
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} else if(errno == ETIMEDOUT && (c->flags & REDIS_BLOCK)) {
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/* especially in windows */
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__redisSetError(c, REDIS_ERR_TIMEOUT, "recv timeout");
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return -1;
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} else {
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__redisSetError(c, REDIS_ERR_IO, NULL);
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return -1;
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}
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} else if (nread == 0) {
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__redisSetError(c, REDIS_ERR_EOF, "Server closed the connection");
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return -1;
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} else {
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return nread;
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}
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}
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ssize_t redisNetWrite(redisContext *c) {
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ssize_t nwritten = send(c->fd, c->obuf, hi_sdslen(c->obuf), 0);
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if (nwritten < 0) {
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if ((errno == EWOULDBLOCK && !(c->flags & REDIS_BLOCK)) || (errno == EINTR)) {
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/* Try again later */
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} else {
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__redisSetError(c, REDIS_ERR_IO, NULL);
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return -1;
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}
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}
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return nwritten;
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}
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static void __redisSetErrorFromErrno(redisContext *c, int type, const char *prefix) {
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int errorno = errno; /* snprintf() may change errno */
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char buf[128] = { 0 };
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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(errorno, (char *)(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) {
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int on = 1;
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if (setsockopt(c->fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) {
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__redisSetErrorFromErrno(c,REDIS_ERR_IO,NULL);
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redisNetClose(c);
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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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redisFD s;
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if ((s = socket(type, SOCK_STREAM, 0)) == REDIS_INVALID_FD) {
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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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c->fd = s;
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if (type == AF_INET) {
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if (redisSetReuseAddr(c) == REDIS_ERR) {
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return REDIS_ERR;
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}
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}
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return REDIS_OK;
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}
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static int redisSetBlocking(redisContext *c, int blocking) {
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#ifndef _WIN32
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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(c->fd, F_GETFL)) == -1) {
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__redisSetErrorFromErrno(c,REDIS_ERR_IO,"fcntl(F_GETFL)");
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redisNetClose(c);
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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(c->fd, F_SETFL, flags) == -1) {
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__redisSetErrorFromErrno(c,REDIS_ERR_IO,"fcntl(F_SETFL)");
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redisNetClose(c);
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return REDIS_ERR;
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}
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#else
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u_long mode = blocking ? 0 : 1;
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if (ioctl(c->fd, FIONBIO, &mode) == -1) {
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__redisSetErrorFromErrno(c, REDIS_ERR_IO, "ioctl(FIONBIO)");
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redisNetClose(c);
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return REDIS_ERR;
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}
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#endif /* _WIN32 */
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return REDIS_OK;
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}
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int redisKeepAlive(redisContext *c, int interval) {
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int val = 1;
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redisFD fd = c->fd;
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if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &val, sizeof(val)) == -1){
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__redisSetError(c,REDIS_ERR_OTHER,strerror(errno));
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return REDIS_ERR;
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}
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val = interval;
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#if defined(__APPLE__) && defined(__MACH__)
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if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPALIVE, &val, sizeof(val)) < 0) {
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__redisSetError(c,REDIS_ERR_OTHER,strerror(errno));
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return REDIS_ERR;
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}
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#else
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#if defined(__GLIBC__) && !defined(__FreeBSD_kernel__)
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if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPIDLE, &val, sizeof(val)) < 0) {
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__redisSetError(c,REDIS_ERR_OTHER,strerror(errno));
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return REDIS_ERR;
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}
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val = interval/3;
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if (val == 0) val = 1;
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if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPINTVL, &val, sizeof(val)) < 0) {
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__redisSetError(c,REDIS_ERR_OTHER,strerror(errno));
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return REDIS_ERR;
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}
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val = 3;
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if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPCNT, &val, sizeof(val)) < 0) {
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__redisSetError(c,REDIS_ERR_OTHER,strerror(errno));
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return REDIS_ERR;
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}
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#endif
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#endif
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return REDIS_OK;
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}
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int redisSetTcpNoDelay(redisContext *c) {
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int yes = 1;
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if (setsockopt(c->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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redisNetClose(c);
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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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#define __MAX_MSEC (((LONG_MAX) - 999) / 1000)
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static int redisContextTimeoutMsec(redisContext *c, long *result)
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{
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const struct timeval *timeout = c->connect_timeout;
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long msec = -1;
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/* Only use timeout when not NULL. */
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if (timeout != NULL) {
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if (timeout->tv_usec > 1000000 || timeout->tv_sec > __MAX_MSEC) {
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*result = msec;
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return REDIS_ERR;
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}
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msec = (timeout->tv_sec * 1000) + ((timeout->tv_usec + 999) / 1000);
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if (msec < 0 || msec > INT_MAX) {
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msec = INT_MAX;
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}
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}
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*result = msec;
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return REDIS_OK;
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}
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static int redisContextWaitReady(redisContext *c, long msec) {
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struct pollfd wfd[1];
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wfd[0].fd = c->fd;
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wfd[0].events = POLLOUT;
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if (errno == EINPROGRESS) {
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int res;
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if ((res = poll(wfd, 1, msec)) == -1) {
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__redisSetErrorFromErrno(c, REDIS_ERR_IO, "poll(2)");
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redisNetClose(c);
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return REDIS_ERR;
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} else if (res == 0) {
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errno = ETIMEDOUT;
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__redisSetErrorFromErrno(c,REDIS_ERR_IO,NULL);
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redisNetClose(c);
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return REDIS_ERR;
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}
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if (redisCheckConnectDone(c, &res) != REDIS_OK || res == 0) {
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redisCheckSocketError(c);
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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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__redisSetErrorFromErrno(c,REDIS_ERR_IO,NULL);
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redisNetClose(c);
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return REDIS_ERR;
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}
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int redisCheckConnectDone(redisContext *c, int *completed) {
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int rc = connect(c->fd, (const struct sockaddr *)c->saddr, c->addrlen);
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if (rc == 0) {
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*completed = 1;
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return REDIS_OK;
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}
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switch (errno) {
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case EISCONN:
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*completed = 1;
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return REDIS_OK;
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case EALREADY:
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case EINPROGRESS:
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case EWOULDBLOCK:
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*completed = 0;
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return REDIS_OK;
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default:
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return REDIS_ERR;
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}
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}
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int redisCheckSocketError(redisContext *c) {
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int err = 0, errno_saved = errno;
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socklen_t errlen = sizeof(err);
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if (getsockopt(c->fd, SOL_SOCKET, SO_ERROR, &err, &errlen) == -1) {
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__redisSetErrorFromErrno(c,REDIS_ERR_IO,"getsockopt(SO_ERROR)");
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return REDIS_ERR;
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}
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if (err == 0) {
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err = errno_saved;
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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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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, const struct timeval tv) {
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const void *to_ptr = &tv;
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size_t to_sz = sizeof(tv);
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if (setsockopt(c->fd,SOL_SOCKET,SO_RCVTIMEO,to_ptr,to_sz) == -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,to_ptr,to_sz) == -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 redisContextUpdateConnectTimeout(redisContext *c, const struct timeval *timeout) {
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/* Same timeval struct, short circuit */
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if (c->connect_timeout == timeout)
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return REDIS_OK;
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/* Allocate context timeval if we need to */
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if (c->connect_timeout == NULL) {
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c->connect_timeout = hi_malloc(sizeof(*c->connect_timeout));
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if (c->connect_timeout == NULL)
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return REDIS_ERR;
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}
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memcpy(c->connect_timeout, timeout, sizeof(*c->connect_timeout));
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return REDIS_OK;
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}
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int redisContextUpdateCommandTimeout(redisContext *c, const struct timeval *timeout) {
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/* Same timeval struct, short circuit */
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if (c->command_timeout == timeout)
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return REDIS_OK;
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/* Allocate context timeval if we need to */
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if (c->command_timeout == NULL) {
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c->command_timeout = hi_malloc(sizeof(*c->command_timeout));
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if (c->command_timeout == NULL)
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return REDIS_ERR;
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}
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memcpy(c->command_timeout, timeout, sizeof(*c->command_timeout));
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return REDIS_OK;
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}
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static int _redisContextConnectTcp(redisContext *c, const char *addr, int port,
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const struct timeval *timeout,
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const char *source_addr) {
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redisFD s;
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int rv, n;
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char _port[6]; /* strlen("65535"); */
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struct addrinfo hints, *servinfo, *bservinfo, *p, *b;
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int blocking = (c->flags & REDIS_BLOCK);
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int reuseaddr = (c->flags & REDIS_REUSEADDR);
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int reuses = 0;
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long timeout_msec = -1;
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servinfo = NULL;
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c->connection_type = REDIS_CONN_TCP;
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c->tcp.port = port;
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/* We need to take possession of the passed parameters
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* to make them reusable for a reconnect.
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* We also carefully check we don't free data we already own,
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* as in the case of the reconnect method.
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*
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* This is a bit ugly, but atleast it works and doesn't leak memory.
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**/
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if (c->tcp.host != addr) {
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hi_free(c->tcp.host);
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c->tcp.host = hi_strdup(addr);
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if (c->tcp.host == NULL)
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goto oom;
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}
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if (timeout) {
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if (redisContextUpdateConnectTimeout(c, timeout) == REDIS_ERR)
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goto oom;
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} else {
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hi_free(c->connect_timeout);
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c->connect_timeout = NULL;
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}
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if (redisContextTimeoutMsec(c, &timeout_msec) != REDIS_OK) {
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__redisSetError(c, REDIS_ERR_IO, "Invalid timeout specified");
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goto error;
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}
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if (source_addr == NULL) {
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hi_free(c->tcp.source_addr);
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c->tcp.source_addr = NULL;
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} else if (c->tcp.source_addr != source_addr) {
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hi_free(c->tcp.source_addr);
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c->tcp.source_addr = hi_strdup(source_addr);
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}
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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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/* Try with IPv6 if no IPv4 address was found. We do it in this order since
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* in a Redis client you can't afford to test if you have IPv6 connectivity
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* as this would add latency to every connect. Otherwise a more sensible
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* route could be: Use IPv6 if both addresses are available and there is IPv6
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* connectivity. */
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if ((rv = getaddrinfo(c->tcp.host,_port,&hints,&servinfo)) != 0) {
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hints.ai_family = AF_INET6;
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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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}
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for (p = servinfo; p != NULL; p = p->ai_next) {
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addrretry:
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if ((s = socket(p->ai_family,p->ai_socktype,p->ai_protocol)) == REDIS_INVALID_FD)
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continue;
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c->fd = s;
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if (redisSetBlocking(c,0) != REDIS_OK)
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goto error;
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if (c->tcp.source_addr) {
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int bound = 0;
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/* Using getaddrinfo saves us from self-determining IPv4 vs IPv6 */
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if ((rv = getaddrinfo(c->tcp.source_addr, NULL, &hints, &bservinfo)) != 0) {
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char buf[128];
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snprintf(buf,sizeof(buf),"Can't get addr: %s",gai_strerror(rv));
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__redisSetError(c,REDIS_ERR_OTHER,buf);
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goto error;
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}
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if (reuseaddr) {
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n = 1;
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if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char*) &n,
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sizeof(n)) < 0) {
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freeaddrinfo(bservinfo);
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goto error;
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}
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}
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for (b = bservinfo; b != NULL; b = b->ai_next) {
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if (bind(s,b->ai_addr,b->ai_addrlen) != -1) {
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bound = 1;
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break;
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}
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}
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freeaddrinfo(bservinfo);
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if (!bound) {
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char buf[128];
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snprintf(buf,sizeof(buf),"Can't bind 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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}
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/* For repeat connection */
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hi_free(c->saddr);
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c->saddr = hi_malloc(p->ai_addrlen);
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if (c->saddr == NULL)
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goto oom;
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memcpy(c->saddr, p->ai_addr, p->ai_addrlen);
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c->addrlen = p->ai_addrlen;
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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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redisNetClose(c);
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continue;
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} else if (errno == EINPROGRESS) {
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if (blocking) {
|
|
goto wait_for_ready;
|
|
}
|
|
/* This is ok.
|
|
* Note that even when it's in blocking mode, we unset blocking
|
|
* for `connect()`
|
|
*/
|
|
} else if (errno == EADDRNOTAVAIL && reuseaddr) {
|
|
if (++reuses >= REDIS_CONNECT_RETRIES) {
|
|
goto error;
|
|
} else {
|
|
redisNetClose(c);
|
|
goto addrretry;
|
|
}
|
|
} else {
|
|
wait_for_ready:
|
|
if (redisContextWaitReady(c,timeout_msec) != REDIS_OK)
|
|
goto error;
|
|
if (redisSetTcpNoDelay(c) != REDIS_OK)
|
|
goto error;
|
|
}
|
|
}
|
|
if (blocking && redisSetBlocking(c,1) != REDIS_OK)
|
|
goto error;
|
|
|
|
c->flags |= REDIS_CONNECTED;
|
|
rv = REDIS_OK;
|
|
goto end;
|
|
}
|
|
if (p == NULL) {
|
|
char buf[128];
|
|
snprintf(buf,sizeof(buf),"Can't create socket: %s",strerror(errno));
|
|
__redisSetError(c,REDIS_ERR_OTHER,buf);
|
|
goto error;
|
|
}
|
|
|
|
oom:
|
|
__redisSetError(c, REDIS_ERR_OOM, "Out of memory");
|
|
error:
|
|
rv = REDIS_ERR;
|
|
end:
|
|
if(servinfo) {
|
|
freeaddrinfo(servinfo);
|
|
}
|
|
|
|
return rv; // Need to return REDIS_OK if alright
|
|
}
|
|
|
|
int redisContextConnectTcp(redisContext *c, const char *addr, int port,
|
|
const struct timeval *timeout) {
|
|
return _redisContextConnectTcp(c, addr, port, timeout, NULL);
|
|
}
|
|
|
|
int redisContextConnectBindTcp(redisContext *c, const char *addr, int port,
|
|
const struct timeval *timeout,
|
|
const char *source_addr) {
|
|
return _redisContextConnectTcp(c, addr, port, timeout, source_addr);
|
|
}
|
|
|
|
int redisContextConnectUnix(redisContext *c, const char *path, const struct timeval *timeout) {
|
|
#ifndef _WIN32
|
|
int blocking = (c->flags & REDIS_BLOCK);
|
|
struct sockaddr_un *sa;
|
|
long timeout_msec = -1;
|
|
|
|
if (redisCreateSocket(c,AF_UNIX) < 0)
|
|
return REDIS_ERR;
|
|
if (redisSetBlocking(c,0) != REDIS_OK)
|
|
return REDIS_ERR;
|
|
|
|
c->connection_type = REDIS_CONN_UNIX;
|
|
if (c->unix_sock.path != path) {
|
|
hi_free(c->unix_sock.path);
|
|
|
|
c->unix_sock.path = hi_strdup(path);
|
|
if (c->unix_sock.path == NULL)
|
|
goto oom;
|
|
}
|
|
|
|
if (timeout) {
|
|
if (redisContextUpdateConnectTimeout(c, timeout) == REDIS_ERR)
|
|
goto oom;
|
|
} else {
|
|
hi_free(c->connect_timeout);
|
|
c->connect_timeout = NULL;
|
|
}
|
|
|
|
if (redisContextTimeoutMsec(c,&timeout_msec) != REDIS_OK)
|
|
return REDIS_ERR;
|
|
|
|
/* Don't leak sockaddr if we're reconnecting */
|
|
if (c->saddr) hi_free(c->saddr);
|
|
|
|
sa = (struct sockaddr_un*)(c->saddr = hi_malloc(sizeof(struct sockaddr_un)));
|
|
if (sa == NULL)
|
|
goto oom;
|
|
|
|
c->addrlen = sizeof(struct sockaddr_un);
|
|
sa->sun_family = AF_UNIX;
|
|
strncpy(sa->sun_path, path, sizeof(sa->sun_path) - 1);
|
|
if (connect(c->fd, (struct sockaddr*)sa, sizeof(*sa)) == -1) {
|
|
if (errno == EINPROGRESS && !blocking) {
|
|
/* This is ok. */
|
|
} else {
|
|
if (redisContextWaitReady(c,timeout_msec) != REDIS_OK)
|
|
return REDIS_ERR;
|
|
}
|
|
}
|
|
|
|
/* Reset socket to be blocking after connect(2). */
|
|
if (blocking && redisSetBlocking(c,1) != REDIS_OK)
|
|
return REDIS_ERR;
|
|
|
|
c->flags |= REDIS_CONNECTED;
|
|
return REDIS_OK;
|
|
#else
|
|
/* We currently do not support Unix sockets for Windows. */
|
|
/* TODO(m): https://devblogs.microsoft.com/commandline/af_unix-comes-to-windows/ */
|
|
errno = EPROTONOSUPPORT;
|
|
return REDIS_ERR;
|
|
#endif /* _WIN32 */
|
|
oom:
|
|
__redisSetError(c, REDIS_ERR_OOM, "Out of memory");
|
|
return REDIS_ERR;
|
|
}
|