682 lines
20 KiB
C
682 lines
20 KiB
C
/*
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* Copyright (c) 2009-2011, 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 <string.h>
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#include <stdlib.h>
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#ifndef _MSC_VER
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#include <unistd.h>
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#include <strings.h>
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#endif
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#include <assert.h>
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#include <errno.h>
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#include <ctype.h>
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#include <limits.h>
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#include <math.h>
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#include "read.h"
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#include "sds.h"
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#include "win32.h"
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static void __redisReaderSetError(redisReader *r, int type, const char *str) {
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size_t len;
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if (r->reply != NULL && r->fn && r->fn->freeObject) {
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r->fn->freeObject(r->reply);
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r->reply = NULL;
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}
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/* Clear input buffer on errors. */
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sdsfree(r->buf);
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r->buf = NULL;
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r->pos = r->len = 0;
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/* Reset task stack. */
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r->ridx = -1;
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/* Set error. */
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r->err = type;
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len = strlen(str);
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len = len < (sizeof(r->errstr)-1) ? len : (sizeof(r->errstr)-1);
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memcpy(r->errstr,str,len);
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r->errstr[len] = '\0';
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}
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static size_t chrtos(char *buf, size_t size, char byte) {
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size_t len = 0;
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switch(byte) {
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case '\\':
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case '"':
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len = snprintf(buf,size,"\"\\%c\"",byte);
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break;
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case '\n': len = snprintf(buf,size,"\"\\n\""); break;
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case '\r': len = snprintf(buf,size,"\"\\r\""); break;
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case '\t': len = snprintf(buf,size,"\"\\t\""); break;
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case '\a': len = snprintf(buf,size,"\"\\a\""); break;
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case '\b': len = snprintf(buf,size,"\"\\b\""); break;
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default:
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if (isprint(byte))
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len = snprintf(buf,size,"\"%c\"",byte);
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else
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len = snprintf(buf,size,"\"\\x%02x\"",(unsigned char)byte);
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break;
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}
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return len;
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}
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static void __redisReaderSetErrorProtocolByte(redisReader *r, char byte) {
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char cbuf[8], sbuf[128];
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chrtos(cbuf,sizeof(cbuf),byte);
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snprintf(sbuf,sizeof(sbuf),
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"Protocol error, got %s as reply type byte", cbuf);
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__redisReaderSetError(r,REDIS_ERR_PROTOCOL,sbuf);
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}
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static void __redisReaderSetErrorOOM(redisReader *r) {
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__redisReaderSetError(r,REDIS_ERR_OOM,"Out of memory");
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}
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static char *readBytes(redisReader *r, unsigned int bytes) {
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char *p;
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if (r->len-r->pos >= bytes) {
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p = r->buf+r->pos;
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r->pos += bytes;
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return p;
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}
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return NULL;
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}
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/* Find pointer to \r\n. */
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static char *seekNewline(char *s, size_t len) {
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int pos = 0;
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int _len = len-1;
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/* Position should be < len-1 because the character at "pos" should be
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* followed by a \n. Note that strchr cannot be used because it doesn't
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* allow to search a limited length and the buffer that is being searched
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* might not have a trailing NULL character. */
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while (pos < _len) {
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while(pos < _len && s[pos] != '\r') pos++;
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if (pos==_len) {
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/* Not found. */
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return NULL;
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} else {
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if (s[pos+1] == '\n') {
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/* Found. */
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return s+pos;
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} else {
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/* Continue searching. */
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pos++;
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}
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}
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}
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return NULL;
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}
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/* Convert a string into a long long. Returns REDIS_OK if the string could be
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* parsed into a (non-overflowing) long long, REDIS_ERR otherwise. The value
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* will be set to the parsed value when appropriate.
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*
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* Note that this function demands that the string strictly represents
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* a long long: no spaces or other characters before or after the string
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* representing the number are accepted, nor zeroes at the start if not
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* for the string "0" representing the zero number.
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*
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* Because of its strictness, it is safe to use this function to check if
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* you can convert a string into a long long, and obtain back the string
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* from the number without any loss in the string representation. */
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static int string2ll(const char *s, size_t slen, long long *value) {
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const char *p = s;
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size_t plen = 0;
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int negative = 0;
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unsigned long long v;
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if (plen == slen)
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return REDIS_ERR;
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/* Special case: first and only digit is 0. */
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if (slen == 1 && p[0] == '0') {
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if (value != NULL) *value = 0;
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return REDIS_OK;
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}
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if (p[0] == '-') {
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negative = 1;
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p++; plen++;
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/* Abort on only a negative sign. */
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if (plen == slen)
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return REDIS_ERR;
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}
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/* First digit should be 1-9, otherwise the string should just be 0. */
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if (p[0] >= '1' && p[0] <= '9') {
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v = p[0]-'0';
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p++; plen++;
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} else if (p[0] == '0' && slen == 1) {
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*value = 0;
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return REDIS_OK;
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} else {
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return REDIS_ERR;
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}
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while (plen < slen && p[0] >= '0' && p[0] <= '9') {
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if (v > (ULLONG_MAX / 10)) /* Overflow. */
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return REDIS_ERR;
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v *= 10;
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if (v > (ULLONG_MAX - (p[0]-'0'))) /* Overflow. */
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return REDIS_ERR;
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v += p[0]-'0';
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p++; plen++;
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}
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/* Return if not all bytes were used. */
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if (plen < slen)
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return REDIS_ERR;
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if (negative) {
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if (v > ((unsigned long long)(-(LLONG_MIN+1))+1)) /* Overflow. */
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return REDIS_ERR;
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if (value != NULL) *value = -v;
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} else {
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if (v > LLONG_MAX) /* Overflow. */
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return REDIS_ERR;
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if (value != NULL) *value = v;
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}
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return REDIS_OK;
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}
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static char *readLine(redisReader *r, int *_len) {
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char *p, *s;
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int len;
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p = r->buf+r->pos;
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s = seekNewline(p,(r->len-r->pos));
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if (s != NULL) {
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len = s-(r->buf+r->pos);
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r->pos += len+2; /* skip \r\n */
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if (_len) *_len = len;
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return p;
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}
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return NULL;
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}
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static void moveToNextTask(redisReader *r) {
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redisReadTask *cur, *prv;
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while (r->ridx >= 0) {
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/* Return a.s.a.p. when the stack is now empty. */
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if (r->ridx == 0) {
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r->ridx--;
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return;
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}
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cur = &(r->rstack[r->ridx]);
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prv = &(r->rstack[r->ridx-1]);
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assert(prv->type == REDIS_REPLY_ARRAY ||
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prv->type == REDIS_REPLY_MAP ||
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prv->type == REDIS_REPLY_SET);
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if (cur->idx == prv->elements-1) {
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r->ridx--;
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} else {
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/* Reset the type because the next item can be anything */
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assert(cur->idx < prv->elements);
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cur->type = -1;
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cur->elements = -1;
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cur->idx++;
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return;
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}
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}
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}
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static int processLineItem(redisReader *r) {
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redisReadTask *cur = &(r->rstack[r->ridx]);
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void *obj;
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char *p;
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int len;
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if ((p = readLine(r,&len)) != NULL) {
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if (cur->type == REDIS_REPLY_INTEGER) {
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if (r->fn && r->fn->createInteger) {
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long long v;
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if (string2ll(p, len, &v) == REDIS_ERR) {
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__redisReaderSetError(r,REDIS_ERR_PROTOCOL,
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"Bad integer value");
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return REDIS_ERR;
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}
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obj = r->fn->createInteger(cur,v);
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} else {
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obj = (void*)REDIS_REPLY_INTEGER;
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}
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} else if (cur->type == REDIS_REPLY_DOUBLE) {
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if (r->fn && r->fn->createDouble) {
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char buf[326], *eptr;
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double d;
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if ((size_t)len >= sizeof(buf)) {
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__redisReaderSetError(r,REDIS_ERR_PROTOCOL,
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"Double value is too large");
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return REDIS_ERR;
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}
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memcpy(buf,p,len);
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buf[len] = '\0';
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if (strcasecmp(buf,",inf") == 0) {
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d = INFINITY; /* Positive infinite. */
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} else if (strcasecmp(buf,",-inf") == 0) {
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d = -INFINITY; /* Nevative infinite. */
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} else {
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d = strtod((char*)buf,&eptr);
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if (buf[0] == '\0' || eptr[0] != '\0' || isnan(d)) {
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__redisReaderSetError(r,REDIS_ERR_PROTOCOL,
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"Bad double value");
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return REDIS_ERR;
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}
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}
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obj = r->fn->createDouble(cur,d,buf,len);
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} else {
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obj = (void*)REDIS_REPLY_DOUBLE;
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}
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} else if (cur->type == REDIS_REPLY_NIL) {
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if (r->fn && r->fn->createNil)
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obj = r->fn->createNil(cur);
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else
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obj = (void*)REDIS_REPLY_NIL;
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} else if (cur->type == REDIS_REPLY_BOOL) {
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int bval = p[0] == 't' || p[0] == 'T';
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if (r->fn && r->fn->createBool)
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obj = r->fn->createBool(cur,bval);
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else
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obj = (void*)REDIS_REPLY_BOOL;
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} else {
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/* Type will be error or status. */
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if (r->fn && r->fn->createString)
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obj = r->fn->createString(cur,p,len);
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else
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obj = (void*)(size_t)(cur->type);
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}
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if (obj == NULL) {
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__redisReaderSetErrorOOM(r);
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return REDIS_ERR;
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}
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/* Set reply if this is the root object. */
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if (r->ridx == 0) r->reply = obj;
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moveToNextTask(r);
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return REDIS_OK;
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}
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return REDIS_ERR;
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}
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static int processBulkItem(redisReader *r) {
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redisReadTask *cur = &(r->rstack[r->ridx]);
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void *obj = NULL;
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char *p, *s;
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long long len;
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unsigned long bytelen;
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int success = 0;
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p = r->buf+r->pos;
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s = seekNewline(p,r->len-r->pos);
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if (s != NULL) {
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p = r->buf+r->pos;
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bytelen = s-(r->buf+r->pos)+2; /* include \r\n */
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if (string2ll(p, bytelen - 2, &len) == REDIS_ERR) {
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__redisReaderSetError(r,REDIS_ERR_PROTOCOL,
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"Bad bulk string length");
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return REDIS_ERR;
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}
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if (len < -1 || (LLONG_MAX > SIZE_MAX && len > (long long)SIZE_MAX)) {
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__redisReaderSetError(r,REDIS_ERR_PROTOCOL,
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"Bulk string length out of range");
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return REDIS_ERR;
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}
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if (len == -1) {
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/* The nil object can always be created. */
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if (r->fn && r->fn->createNil)
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obj = r->fn->createNil(cur);
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else
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obj = (void*)REDIS_REPLY_NIL;
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success = 1;
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} else {
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/* Only continue when the buffer contains the entire bulk item. */
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bytelen += len+2; /* include \r\n */
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if (r->pos+bytelen <= r->len) {
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if ((cur->type == REDIS_REPLY_VERB && len < 4) ||
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(cur->type == REDIS_REPLY_VERB && s[5] != ':'))
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{
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__redisReaderSetError(r,REDIS_ERR_PROTOCOL,
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"Verbatim string 4 bytes of content type are "
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"missing or incorrectly encoded.");
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return REDIS_ERR;
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}
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if (r->fn && r->fn->createString)
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obj = r->fn->createString(cur,s+2,len);
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else
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obj = (void*)(long)cur->type;
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success = 1;
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}
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}
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/* Proceed when obj was created. */
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if (success) {
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if (obj == NULL) {
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__redisReaderSetErrorOOM(r);
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return REDIS_ERR;
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}
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r->pos += bytelen;
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/* Set reply if this is the root object. */
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if (r->ridx == 0) r->reply = obj;
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moveToNextTask(r);
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return REDIS_OK;
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}
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}
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return REDIS_ERR;
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}
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/* Process the array, map and set types. */
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static int processAggregateItem(redisReader *r) {
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redisReadTask *cur = &(r->rstack[r->ridx]);
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void *obj;
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char *p;
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long long elements;
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int root = 0, len;
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/* Set error for nested multi bulks with depth > 7 */
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if (r->ridx == 8) {
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__redisReaderSetError(r,REDIS_ERR_PROTOCOL,
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"No support for nested multi bulk replies with depth > 7");
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return REDIS_ERR;
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}
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if ((p = readLine(r,&len)) != NULL) {
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if (string2ll(p, len, &elements) == REDIS_ERR) {
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__redisReaderSetError(r,REDIS_ERR_PROTOCOL,
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"Bad multi-bulk length");
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return REDIS_ERR;
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}
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root = (r->ridx == 0);
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if (elements < -1 || (LLONG_MAX > SIZE_MAX && elements > SIZE_MAX)) {
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__redisReaderSetError(r,REDIS_ERR_PROTOCOL,
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"Multi-bulk length out of range");
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return REDIS_ERR;
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}
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if (elements == -1) {
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if (r->fn && r->fn->createNil)
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obj = r->fn->createNil(cur);
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else
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obj = (void*)REDIS_REPLY_NIL;
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if (obj == NULL) {
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__redisReaderSetErrorOOM(r);
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return REDIS_ERR;
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}
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moveToNextTask(r);
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} else {
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if (cur->type == REDIS_REPLY_MAP) elements *= 2;
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if (r->fn && r->fn->createArray)
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obj = r->fn->createArray(cur,elements);
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else
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obj = (void*)(long)cur->type;
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if (obj == NULL) {
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__redisReaderSetErrorOOM(r);
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return REDIS_ERR;
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}
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/* Modify task stack when there are more than 0 elements. */
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if (elements > 0) {
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cur->elements = elements;
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cur->obj = obj;
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r->ridx++;
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r->rstack[r->ridx].type = -1;
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r->rstack[r->ridx].elements = -1;
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r->rstack[r->ridx].idx = 0;
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r->rstack[r->ridx].obj = NULL;
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r->rstack[r->ridx].parent = cur;
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r->rstack[r->ridx].privdata = r->privdata;
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} else {
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moveToNextTask(r);
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}
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}
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/* Set reply if this is the root object. */
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if (root) r->reply = obj;
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return REDIS_OK;
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}
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return REDIS_ERR;
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}
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static int processItem(redisReader *r) {
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redisReadTask *cur = &(r->rstack[r->ridx]);
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char *p;
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/* check if we need to read type */
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if (cur->type < 0) {
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if ((p = readBytes(r,1)) != NULL) {
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switch (p[0]) {
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case '-':
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cur->type = REDIS_REPLY_ERROR;
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break;
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case '+':
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cur->type = REDIS_REPLY_STATUS;
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break;
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case ':':
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cur->type = REDIS_REPLY_INTEGER;
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break;
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case ',':
|
|
cur->type = REDIS_REPLY_DOUBLE;
|
|
break;
|
|
case '_':
|
|
cur->type = REDIS_REPLY_NIL;
|
|
break;
|
|
case '$':
|
|
cur->type = REDIS_REPLY_STRING;
|
|
break;
|
|
case '*':
|
|
cur->type = REDIS_REPLY_ARRAY;
|
|
break;
|
|
case '%':
|
|
cur->type = REDIS_REPLY_MAP;
|
|
break;
|
|
case '~':
|
|
cur->type = REDIS_REPLY_SET;
|
|
break;
|
|
case '#':
|
|
cur->type = REDIS_REPLY_BOOL;
|
|
break;
|
|
case '=':
|
|
cur->type = REDIS_REPLY_VERB;
|
|
break;
|
|
default:
|
|
__redisReaderSetErrorProtocolByte(r,*p);
|
|
return REDIS_ERR;
|
|
}
|
|
} else {
|
|
/* could not consume 1 byte */
|
|
return REDIS_ERR;
|
|
}
|
|
}
|
|
|
|
/* process typed item */
|
|
switch(cur->type) {
|
|
case REDIS_REPLY_ERROR:
|
|
case REDIS_REPLY_STATUS:
|
|
case REDIS_REPLY_INTEGER:
|
|
case REDIS_REPLY_DOUBLE:
|
|
case REDIS_REPLY_NIL:
|
|
case REDIS_REPLY_BOOL:
|
|
return processLineItem(r);
|
|
case REDIS_REPLY_STRING:
|
|
case REDIS_REPLY_VERB:
|
|
return processBulkItem(r);
|
|
case REDIS_REPLY_ARRAY:
|
|
case REDIS_REPLY_MAP:
|
|
case REDIS_REPLY_SET:
|
|
return processAggregateItem(r);
|
|
default:
|
|
assert(NULL);
|
|
return REDIS_ERR; /* Avoid warning. */
|
|
}
|
|
}
|
|
|
|
redisReader *redisReaderCreateWithFunctions(redisReplyObjectFunctions *fn) {
|
|
redisReader *r;
|
|
|
|
r = calloc(1,sizeof(redisReader));
|
|
if (r == NULL)
|
|
return NULL;
|
|
|
|
r->fn = fn;
|
|
r->buf = sdsempty();
|
|
r->maxbuf = REDIS_READER_MAX_BUF;
|
|
if (r->buf == NULL) {
|
|
free(r);
|
|
return NULL;
|
|
}
|
|
|
|
r->ridx = -1;
|
|
return r;
|
|
}
|
|
|
|
void redisReaderFree(redisReader *r) {
|
|
if (r == NULL)
|
|
return;
|
|
if (r->reply != NULL && r->fn && r->fn->freeObject)
|
|
r->fn->freeObject(r->reply);
|
|
sdsfree(r->buf);
|
|
free(r);
|
|
}
|
|
|
|
int redisReaderFeed(redisReader *r, const char *buf, size_t len) {
|
|
sds newbuf;
|
|
|
|
/* Return early when this reader is in an erroneous state. */
|
|
if (r->err)
|
|
return REDIS_ERR;
|
|
|
|
/* Copy the provided buffer. */
|
|
if (buf != NULL && len >= 1) {
|
|
/* Destroy internal buffer when it is empty and is quite large. */
|
|
if (r->len == 0 && r->maxbuf != 0 && sdsavail(r->buf) > r->maxbuf) {
|
|
sdsfree(r->buf);
|
|
r->buf = sdsempty();
|
|
r->pos = 0;
|
|
|
|
/* r->buf should not be NULL since we just free'd a larger one. */
|
|
assert(r->buf != NULL);
|
|
}
|
|
|
|
newbuf = sdscatlen(r->buf,buf,len);
|
|
if (newbuf == NULL) {
|
|
__redisReaderSetErrorOOM(r);
|
|
return REDIS_ERR;
|
|
}
|
|
|
|
r->buf = newbuf;
|
|
r->len = sdslen(r->buf);
|
|
}
|
|
|
|
return REDIS_OK;
|
|
}
|
|
|
|
int redisReaderGetReply(redisReader *r, void **reply) {
|
|
/* Default target pointer to NULL. */
|
|
if (reply != NULL)
|
|
*reply = NULL;
|
|
|
|
/* Return early when this reader is in an erroneous state. */
|
|
if (r->err)
|
|
return REDIS_ERR;
|
|
|
|
/* When the buffer is empty, there will never be a reply. */
|
|
if (r->len == 0)
|
|
return REDIS_OK;
|
|
|
|
/* Set first item to process when the stack is empty. */
|
|
if (r->ridx == -1) {
|
|
r->rstack[0].type = -1;
|
|
r->rstack[0].elements = -1;
|
|
r->rstack[0].idx = -1;
|
|
r->rstack[0].obj = NULL;
|
|
r->rstack[0].parent = NULL;
|
|
r->rstack[0].privdata = r->privdata;
|
|
r->ridx = 0;
|
|
}
|
|
|
|
/* Process items in reply. */
|
|
while (r->ridx >= 0)
|
|
if (processItem(r) != REDIS_OK)
|
|
break;
|
|
|
|
/* Return ASAP when an error occurred. */
|
|
if (r->err)
|
|
return REDIS_ERR;
|
|
|
|
/* Discard part of the buffer when we've consumed at least 1k, to avoid
|
|
* doing unnecessary calls to memmove() in sds.c. */
|
|
if (r->pos >= 1024) {
|
|
sdsrange(r->buf,r->pos,-1);
|
|
r->pos = 0;
|
|
r->len = sdslen(r->buf);
|
|
}
|
|
|
|
/* Emit a reply when there is one. */
|
|
if (r->ridx == -1) {
|
|
if (reply != NULL) {
|
|
*reply = r->reply;
|
|
} else if (r->reply != NULL && r->fn && r->fn->freeObject) {
|
|
r->fn->freeObject(r->reply);
|
|
}
|
|
r->reply = NULL;
|
|
}
|
|
return REDIS_OK;
|
|
}
|