mirror of
https://github.com/rspamd/rspamd.git
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465 lines
14 KiB
C
465 lines
14 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 <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 <poll.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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/* Defined in hiredis.c */
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void __redisSetError(redisContext *c, int type, const char *str);
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static void redisContextCloseFd(redisContext *c) {
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if (c && c->fd >= 0) {
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close(c->fd);
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c->fd = -1;
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}
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}
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static void __redisSetErrorFromErrno(redisContext *c, int type, const char *prefix) {
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char buf[128] = { 0 };
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char *p;
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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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p = buf + len;
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__redis_strerror_r(errno, p, 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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redisContextCloseFd(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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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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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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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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redisContextCloseFd(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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redisContextCloseFd(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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int redisKeepAlive(redisContext *c, int interval) {
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int val = 1;
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int 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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#ifdef _OSX
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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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val = interval;
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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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static 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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redisContextCloseFd(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 redisContextWaitReady(redisContext *c, const struct timeval *timeout) {
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struct pollfd wfd[1];
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long msec;
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msec = -1;
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wfd[0].fd = c->fd;
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wfd[0].events = POLLOUT;
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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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__redisSetErrorFromErrno(c, REDIS_ERR_IO, NULL);
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redisContextCloseFd(c);
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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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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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redisContextCloseFd(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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redisContextCloseFd(c);
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return REDIS_ERR;
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}
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if (redisCheckSocketError(c) != 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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redisContextCloseFd(c);
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return REDIS_ERR;
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}
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int redisCheckSocketError(redisContext *c) {
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int err = 0;
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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) {
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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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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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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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int s, 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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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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if (c->tcp.host)
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free(c->tcp.host);
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c->tcp.host = strdup(addr);
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}
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if (timeout) {
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if (c->timeout != timeout) {
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if (c->timeout == NULL)
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c->timeout = malloc(sizeof(struct timeval));
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memcpy(c->timeout, timeout, sizeof(struct timeval));
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}
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} else {
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if (c->timeout)
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free(c->timeout);
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c->timeout = NULL;
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}
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if (source_addr == NULL) {
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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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free(c->tcp.source_addr);
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c->tcp.source_addr = 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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if (!blocking) {
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/* Rspamd specific: never try to resolve on non-blocking conn requests */
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hints.ai_flags = AI_NUMERICHOST | AI_NUMERICSERV;
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}
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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)) == -1)
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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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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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if (redisSetTcpNoDelay(c) != 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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redisContextCloseFd(c);
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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 if (errno == EADDRNOTAVAIL && reuseaddr) {
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if (++reuses >= REDIS_CONNECT_RETRIES) {
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goto error;
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} else {
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goto addrretry;
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}
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} else {
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if (redisContextWaitReady(c,c->timeout) != REDIS_OK)
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goto error;
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}
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}
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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 (blocking && redisSetBlocking(c,1) != REDIS_OK)
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goto error;
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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 redisContextConnectTcp(redisContext *c, const char *addr, int port,
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const struct timeval *timeout) {
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return _redisContextConnectTcp(c, addr, port, timeout, NULL);
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}
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int redisContextConnectBindTcp(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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return _redisContextConnectTcp(c, addr, port, timeout, source_addr);
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}
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int redisContextConnectUnix(redisContext *c, const char *path, const struct timeval *timeout) {
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int blocking = (c->flags & REDIS_BLOCK);
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struct sockaddr_un sa;
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if (redisCreateSocket(c,AF_LOCAL) < 0)
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return REDIS_ERR;
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if (redisSetBlocking(c,0) != REDIS_OK)
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return REDIS_ERR;
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c->connection_type = REDIS_CONN_UNIX;
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if (c->unix_sock.path != path)
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c->unix_sock.path = strdup(path);
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if (timeout) {
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if (c->timeout != timeout) {
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if (c->timeout == NULL)
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c->timeout = malloc(sizeof(struct timeval));
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memcpy(c->timeout, timeout, sizeof(struct timeval));
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}
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} else {
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if (c->timeout)
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free(c->timeout);
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c->timeout = NULL;
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}
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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(c->fd, (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,c->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,1) != REDIS_OK)
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return REDIS_ERR;
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c->flags |= REDIS_CONNECTED;
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return REDIS_OK;
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}
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