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mb_hash.c
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mb_hash.c
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/*
** Copyright (c) 2013 Marc Falzon / Cloudwatt
**
** Permission is hereby granted, free of charge, to any person obtaining a copy
** of this software and associated documentation files (the "Software"), to deal
** in the Software without restriction, including without limitation the rights
** to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
** copies of the Software, and to permit persons to whom the Software is
** furnished to do so, subject to the following conditions:
**
** The above copyright notice and this permission notice shall be included in all
** copies or substantial portions of the Software.
**
** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
** IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
** FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
** AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
** LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
** OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
** SOFTWARE.
*/
#include "mod_bunny.h"
#include "mb_hash.h"
/* From http://www.cse.yorku.ca/~oz/hash.html */
static unsigned long djb2_hash(unsigned char *str) {
/* {{{ */
unsigned long hash = 5381;
int c;
while ((c = *str++))
hash = ((hash << 5) + hash) + c; /* hash * 33 + c */
return (hash);
/* }}} */
}
void mb_gen_cid(char *cid_buf, size_t cid_buf_len, char *host, char *service) {
/* {{{ */
char buf[256] = {0};
struct timeval now;
gettimeofday(&now, NULL);
/* Correlation ID = host + service + msec time */
snprintf(buf,
sizeof (buf) - 1,
"%s%s%ld.%ld",
host,
(service ? service : ""),
now.tv_sec, now.tv_usec);
snprintf(cid_buf, cid_buf_len, "%lX", djb2_hash((unsigned char *)buf));
/* }}} */
}
// vim: ft=c ts=4 et foldmethod=marker