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/*
Copyright (C) 2017 Paweł Redman
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 3
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "shared.h"
typedef enum {
ENTRY_REVDNS,
ENTRY_WHOIS
} entry_type_t;
typedef struct {
entry_type_t type;
char *pattern;
int niceness;
eli_header list;
} entry_t;
static entry_t *entry_list;
static pthread_mutex_t entry_list_mutex = PTHREAD_MUTEX_INITIALIZER;
static size_t total_entries;
static int parse_entry(lexer_state_t *lexer, vstr_t *token, entry_type_t type)
{
entry_t *entry;
int niceness;
char *pattern;
if (lexer_get_token(lexer)) {
lexer_perror_eg(lexer, "the niceness adjustment");
return 1;
}
niceness = atoi(vstr_to_cstr(token));
if (lexer_get_token(lexer)) {
lexer_perror_eg(lexer, "the pattern");
return 1;
}
pattern = vstr_strdup(token);
if (!pattern) {
lexer_perror(lexer, "out of memory\n");
return 1;
}
entry = malloc(sizeof(entry_t));
if (!entry) {
free(pattern);
lexer_perror(lexer, "out of memory\n");
return 1;
}
entry->type = type;
entry->niceness = niceness;
entry->pattern = pattern;
eli_append(&entry_list, entry, list);
total_entries++;
return 0;
}
// NOTE: This function is not MT-safe. It's to be called only once during
// initialization. Use lists_reload to reload the lists on-the-fly.
int lists_load(const char *file, size_t depth)
{
int error = 1, rv;
lexer_state_t lexer;
vstr_t token = VSTR_INITIALIZER;
if (depth > 20) {
eprintf("%s: error: deep recursion (probably a circular dependency)\n", file);
return 1;
}
if ((rv = lexer_open(&lexer, file, &token))) {
perror(file);
return 1;
}
while (!lexer_get_token(&lexer)) {
if (!vstr_cmp(&token, "include")) {
if (lexer_get_token(&lexer)) {
lexer_perror_eg(&lexer, "the filename");
goto out;
}
// FIXME: relative paths
if (lists_load(vstr_to_cstr(&token), depth + 1)) {
lexer_perror(&lexer, "included from here\n");
goto out;
}
} else if (!vstr_cmp(&token, "revdns")) {
if (parse_entry(&lexer, &token, ENTRY_REVDNS))
goto out;
} else if (!vstr_cmp(&token, "whois")) {
if (parse_entry(&lexer, &token, ENTRY_WHOIS))
goto out;
} else {
lexer_perror_eg(&lexer, "'whois' or 'revdns'");
goto out;
}
}
if (depth == 0)
DEBUG("loaded entries: %zu\n", total_entries);
error = 0;
out:
lexer_close(&lexer);
return error;
}
void lists_destroy(void)
{
entry_t *entry, *next;
for (entry = entry_list; entry; entry = next){
next = entry->list.next;
free(entry->pattern);
free(entry);
}
entry_list = NULL;
total_entries = 0;
}
int lists_reload(const char *file)
{
int ret;
pthread_mutex_lock(&entry_list_mutex);
lists_destroy();
ret = lists_load(file, 0);
if (!ret)
lists_destroy();
pthread_mutex_unlock(&entry_list_mutex);
// FIXME: invalidate all cached results
return ret;
}
int lists_test(const char *revdns, const char *whois)
{
entry_t *entry;
int total = 0;
pthread_mutex_lock(&entry_list_mutex);
eli_for(entry, entry_list, list) {
// TODO: regexps
if (entry->type == ENTRY_REVDNS &&
!strstr(revdns, entry->pattern))
continue;
if (entry->type == ENTRY_WHOIS &&
!strstr(whois, entry->pattern))
continue;
// TODO: avoid overflows
total += entry->niceness;
}
pthread_mutex_unlock(&entry_list_mutex);
return total;
}
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