475 lines
12 KiB
C
475 lines
12 KiB
C
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/*-
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* Copyright (c) 2005 Michael Bushkov <bushman@rsu.ru>
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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
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* 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 AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <assert.h>
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#include <stdio.h>
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#include <string.h>
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#include "config.h"
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#include "debug.h"
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#include "log.h"
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#include "parser.h"
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static void enable_cache(struct configuration *,const char *, int);
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static struct configuration_entry *find_create_entry(struct configuration *,
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const char *);
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static int get_number(const char *, int, int);
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static enum cache_policy_t get_policy(const char *);
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static int get_yesno(const char *);
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static int check_cachename(const char *);
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static void check_files(struct configuration *, const char *, int);
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static void set_keep_hot_count(struct configuration *, const char *, int);
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static void set_negative_policy(struct configuration *, const char *,
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enum cache_policy_t);
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static void set_negative_time_to_live(struct configuration *,
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const char *, int);
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static void set_positive_policy(struct configuration *, const char *,
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enum cache_policy_t);
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static void set_perform_actual_lookups(struct configuration *, const char *,
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int);
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static void set_positive_time_to_live(struct configuration *,
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const char *, int);
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static void set_suggested_size(struct configuration *, const char *,
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int size);
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static void set_threads_num(struct configuration *, int);
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static int strbreak(char *, char **, int);
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static int
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strbreak(char *str, char **fields, int fields_size)
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{
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char *c = str;
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int i, num;
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TRACE_IN(strbreak);
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num = 0;
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for (i = 0;
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((*fields =
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strsep(i < fields_size ? &c : NULL, "\n\t ")) != NULL);
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++i)
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if ((*(*fields)) != '\0') {
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++fields;
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++num;
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}
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TRACE_OUT(strbreak);
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return (num);
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}
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/*
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* Tries to find the configuration entry with the specified name. If search
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* fails, the new entry with the default parameters will be created.
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*/
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static struct configuration_entry *
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find_create_entry(struct configuration *config,
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const char *entry_name)
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{
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struct configuration_entry *entry = NULL;
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int res;
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TRACE_IN(find_create_entry);
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entry = configuration_find_entry(config, entry_name);
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if (entry == NULL) {
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entry = create_def_configuration_entry(entry_name);
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assert( entry != NULL);
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res = add_configuration_entry(config, entry);
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assert(res == 0);
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}
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TRACE_OUT(find_create_entry);
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return (entry);
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}
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/*
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* The vast majority of the functions below corresponds to the particular
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* keywords in the configuration file.
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*/
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static void
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enable_cache(struct configuration *config, const char *entry_name, int flag)
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{
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struct configuration_entry *entry;
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TRACE_IN(enable_cache);
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entry = find_create_entry(config, entry_name);
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entry->enabled = flag;
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TRACE_OUT(enable_cache);
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}
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static void
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set_positive_time_to_live(struct configuration *config,
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const char *entry_name, int ttl)
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{
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struct configuration_entry *entry;
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struct timeval lifetime;
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TRACE_IN(set_positive_time_to_live);
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assert(ttl >= 0);
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assert(entry_name != NULL);
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memset(&lifetime, 0, sizeof(struct timeval));
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lifetime.tv_sec = ttl;
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entry = find_create_entry(config, entry_name);
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memcpy(&entry->positive_cache_params.max_lifetime,
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&lifetime, sizeof(struct timeval));
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memcpy(&entry->mp_cache_params.max_lifetime,
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&lifetime, sizeof(struct timeval));
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TRACE_OUT(set_positive_time_to_live);
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}
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static void
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set_negative_time_to_live(struct configuration *config,
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const char *entry_name, int nttl)
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{
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struct configuration_entry *entry;
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struct timeval lifetime;
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TRACE_IN(set_negative_time_to_live);
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assert(nttl > 0);
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assert(entry_name != NULL);
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memset(&lifetime, 0, sizeof(struct timeval));
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lifetime.tv_sec = nttl;
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entry = find_create_entry(config, entry_name);
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assert(entry != NULL);
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memcpy(&entry->negative_cache_params.max_lifetime,
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&lifetime, sizeof(struct timeval));
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TRACE_OUT(set_negative_time_to_live);
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}
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/*
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* Hot count is actually the elements size limit.
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*/
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static void
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set_keep_hot_count(struct configuration *config,
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const char *entry_name, int count)
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{
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struct configuration_entry *entry;
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TRACE_IN(set_keep_hot_count);
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assert(count >= 0);
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assert(entry_name != NULL);
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entry = find_create_entry(config, entry_name);
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assert(entry != NULL);
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entry->positive_cache_params.max_elemsize = count;
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entry = find_create_entry(config, entry_name);
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assert(entry != NULL);
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entry->negative_cache_params.max_elemsize = count;
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TRACE_OUT(set_keep_hot_count);
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}
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static void
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set_positive_policy(struct configuration *config,
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const char *entry_name, enum cache_policy_t policy)
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{
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struct configuration_entry *entry;
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TRACE_IN(set_positive_policy);
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assert(entry_name != NULL);
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entry = find_create_entry(config, entry_name);
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assert(entry != NULL);
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entry->positive_cache_params.policy = policy;
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TRACE_OUT(set_positive_policy);
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}
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static void
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set_negative_policy(struct configuration *config,
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const char *entry_name, enum cache_policy_t policy)
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{
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struct configuration_entry *entry;
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TRACE_IN(set_negative_policy);
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assert(entry_name != NULL);
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entry = find_create_entry(config, entry_name);
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assert(entry != NULL);
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entry->negative_cache_params.policy = policy;
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TRACE_OUT(set_negative_policy);
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}
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static void
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set_perform_actual_lookups(struct configuration *config,
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const char *entry_name, int flag)
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{
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struct configuration_entry *entry;
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TRACE_IN(set_perform_actual_lookups);
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assert(entry_name != NULL);
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entry = find_create_entry(config, entry_name);
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assert(entry != NULL);
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entry->perform_actual_lookups = flag;
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TRACE_OUT(set_perform_actual_lookups);
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}
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static void
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set_suggested_size(struct configuration *config,
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const char *entry_name, int size)
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{
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struct configuration_entry *entry;
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TRACE_IN(set_suggested_size);
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assert(config != NULL);
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assert(entry_name != NULL);
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assert(size > 0);
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entry = find_create_entry(config, entry_name);
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assert(entry != NULL);
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entry->positive_cache_params.cache_entries_size = size;
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entry->negative_cache_params.cache_entries_size = size;
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TRACE_OUT(set_suggested_size);
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}
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static void
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check_files(struct configuration *config, const char *entry_name, int flag)
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{
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TRACE_IN(check_files);
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assert(entry_name != NULL);
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TRACE_OUT(check_files);
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}
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static int
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get_yesno(const char *str)
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{
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if (strcmp(str, "yes") == 0)
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return (1);
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else if (strcmp(str, "no") == 0)
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return (0);
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else
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return (-1);
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}
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static int
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get_number(const char *str, int low, int max)
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{
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char *end = NULL;
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int res = 0;
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if (str[0] == '\0')
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return (-1);
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res = strtol(str, &end, 10);
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if (*end != '\0')
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return (-1);
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else
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if (((res >= low) || (low == -1)) &&
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((res <= max) || (max == -1)))
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return (res);
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else
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return (-2);
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}
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static enum cache_policy_t
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get_policy(const char *str)
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{
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if (strcmp(str, "fifo") == 0)
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return (CPT_FIFO);
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else if (strcmp(str, "lru") == 0)
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return (CPT_LRU);
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else if (strcmp(str, "lfu") == 0)
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return (CPT_LFU);
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return (-1);
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}
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static int
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check_cachename(const char *str)
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{
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assert(str != NULL);
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return ((strlen(str) > 0) ? 0 : -1);
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}
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static void
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set_threads_num(struct configuration *config, int value)
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{
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assert(config != NULL);
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config->threads_num = value;
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}
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/*
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* The main configuration routine. Its implementation is hugely inspired by the
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* the same routine implementation in Solaris NSCD.
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*/
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int
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parse_config_file(struct configuration *config,
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const char *fname, char const **error_str, int *error_line)
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{
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FILE *fin;
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char buffer[255];
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char *fields[128];
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int field_count, line_num, value;
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int res;
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TRACE_IN(parse_config_file);
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assert(config != NULL);
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assert(fname != NULL);
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fin = fopen(fname, "r");
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if (fin == NULL) {
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TRACE_OUT(parse_config_file);
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return (-1);
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}
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res = 0;
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line_num = 0;
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memset(buffer, 0, sizeof(buffer));
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while ((res == 0) && (fgets(buffer, sizeof(buffer) - 1, fin) != NULL)) {
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field_count = strbreak(buffer, fields, sizeof(fields));
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++line_num;
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if (field_count == 0)
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continue;
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switch (fields[0][0]) {
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case '#':
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case '\0':
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continue;
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case 'e':
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if ((field_count == 3) &&
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(strcmp(fields[0], "enable-cache") == 0) &&
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(check_cachename(fields[1]) == 0) &&
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((value = get_yesno(fields[2])) != -1)) {
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enable_cache(config, fields[1], value);
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continue;
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}
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break;
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case 'd':
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if ((field_count == 2) &&
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(strcmp(fields[0], "debug-level") == 0) &&
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((value = get_number(fields[1], 0, 10)) != -1)) {
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continue;
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}
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break;
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case 'p':
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if ((field_count == 3) &&
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(strcmp(fields[0], "positive-time-to-live") == 0) &&
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(check_cachename(fields[1]) == 0) &&
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((value = get_number(fields[2], 0, -1)) != -1)) {
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set_positive_time_to_live(config,
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fields[1], value);
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continue;
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} else if ((field_count == 3) &&
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(strcmp(fields[0], "positive-policy") == 0) &&
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(check_cachename(fields[1]) == 0) &&
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((value = get_policy(fields[2])) != -1)) {
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set_positive_policy(config, fields[1], value);
|
||
|
|
continue;
|
||
|
|
} else if ((field_count == 3) &&
|
||
|
|
(strcmp(fields[0], "perform-actual-lookups") == 0) &&
|
||
|
|
(check_cachename(fields[1]) == 0) &&
|
||
|
|
((value = get_yesno(fields[2])) != -1)) {
|
||
|
|
set_perform_actual_lookups(config, fields[1],
|
||
|
|
value);
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case 'n':
|
||
|
|
if ((field_count == 3) &&
|
||
|
|
(strcmp(fields[0], "negative-time-to-live") == 0) &&
|
||
|
|
(check_cachename(fields[1]) == 0) &&
|
||
|
|
((value = get_number(fields[2], 0, -1)) != -1)) {
|
||
|
|
set_negative_time_to_live(config,
|
||
|
|
fields[1], value);
|
||
|
|
continue;
|
||
|
|
} else if ((field_count == 3) &&
|
||
|
|
(strcmp(fields[0], "negative-policy") == 0) &&
|
||
|
|
(check_cachename(fields[1]) == 0) &&
|
||
|
|
((value = get_policy(fields[2])) != -1)) {
|
||
|
|
set_negative_policy(config,
|
||
|
|
fields[1], value);
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case 's':
|
||
|
|
if ((field_count == 3) &&
|
||
|
|
(strcmp(fields[0], "suggested-size") == 0) &&
|
||
|
|
(check_cachename(fields[1]) == 0) &&
|
||
|
|
((value = get_number(fields[2], 1, -1)) != -1)) {
|
||
|
|
set_suggested_size(config, fields[1], value);
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case 't':
|
||
|
|
if ((field_count == 2) &&
|
||
|
|
(strcmp(fields[0], "threads") == 0) &&
|
||
|
|
((value = get_number(fields[1], 1, -1)) != -1)) {
|
||
|
|
set_threads_num(config, value);
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case 'k':
|
||
|
|
if ((field_count == 3) &&
|
||
|
|
(strcmp(fields[0], "keep-hot-count") == 0) &&
|
||
|
|
(check_cachename(fields[1]) == 0) &&
|
||
|
|
((value = get_number(fields[2], 0, -1)) != -1)) {
|
||
|
|
set_keep_hot_count(config,
|
||
|
|
fields[1], value);
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case 'c':
|
||
|
|
if ((field_count == 3) &&
|
||
|
|
(strcmp(fields[0], "check-files") == 0) &&
|
||
|
|
(check_cachename(fields[1]) == 0) &&
|
||
|
|
((value = get_yesno(fields[2])) != -1)) {
|
||
|
|
check_files(config,
|
||
|
|
fields[1], value);
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
LOG_ERR_2("config file parser", "error in file "
|
||
|
|
"%s on line %d", fname, line_num);
|
||
|
|
*error_str = "syntax error";
|
||
|
|
*error_line = line_num;
|
||
|
|
res = -1;
|
||
|
|
}
|
||
|
|
fclose(fin);
|
||
|
|
|
||
|
|
TRACE_OUT(parse_config_file);
|
||
|
|
return (res);
|
||
|
|
}
|