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mod_anticrawl.c
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/*
mod_anticrawl for Apache 2
@author Oguzhan Topgul
@mail [email protected]
mod_anticralw is an Apache module that fights against web site crawlers, bots, and automated vulnerability scanners
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <time.h>
#include <syslog.h>
#include <errno.h>
#include "httpd.h"
#include "http_core.h"
#include "http_config.h"
#include "http_log.h"
#include "http_request.h"
#include "apr_strmatch.h"
#include "apr_general.h"
#include "apr_strings.h"
#include "apr_strmatch.h"
#include "apr_lib.h"
#include "apr_buckets.h"
#include "apr_want.h"
#include "apr_global_mutex.h"
module AP_MODULE_DECLARE_DATA anticrawl_module;
/* BEGIN Anticrawler Definitions */
#define MAILER "/bin/mail %s"
#define LOG( A, ... ) { openlog("mod_anticrawl", LOG_PID, LOG_DAEMON); syslog( A, __VA_ARGS__ ); closelog(); }
#define DEFAULT_HASH_TBL_SIZE 3097ul // Default hash table size
#define DEFAULT_COUNT 100 // Default maximum site hit count per interval
#define DEFAULT_INTERVAL 3 // Default 1 Second site interval
#define DEFAULT_BLOCKING_PERIOD 3600 // Default for Detected IPs; blocked for 10 seconds
#define DEFAULT_LOG_DIR "/tmp" // Default temp directory
/* END Anticrawler Definitions */
/* BEGIN tree (Named Timestamp Tree) Headers */
enum {
tree_num_primes = 28
};
apr_global_mutex_t *mutex;
/* tree root tree */
struct tree {
long size;
long items;
struct tree_node **tbl;
};
/* tree node (entry in the tree root tree) */
struct tree_node {
char *key;
time_t timestamp;
long count;
struct tree_node *next;
};
/* tree cursor */
struct tree_c {
long iter_index;
struct tree_node *iter_next;
};
struct tree *tree_create(long size);
int tree_destroy(struct tree *tree);
struct tree_node *tree_find(struct tree *tree, const char *key);
struct tree_node *tree_insert(struct tree *tree, const char *key);
int tree_delete(struct tree *tree, const char *key);
long tree_hashcode(struct tree *tree, const char *key);
struct tree_node *c_tree_first(struct tree *tree, struct tree_c *c);
struct tree_node *c_tree_next(struct tree *tree, struct tree_c *c);
void mymutex_lock();
void mymutex_unlock();
/* END tree (Named Timestamp Tree) Headers */
/* Inject Function Related Structs */
static const char injection_filter_name[] = "INJECT";
typedef struct inject_pattern_t {
const apr_strmatch_pattern *pattern;
const ap_regex_t *regexp;
const char *replacement;
apr_size_t replen;
apr_size_t patlen;
int flatten;
} inject_pattern_t;
typedef struct {
apr_array_header_t *patterns;
} inject_dir_conf;
typedef struct {
apr_bucket_brigade *linebb;
apr_bucket_brigade *linesbb;
apr_bucket_brigade *passbb;
apr_bucket_brigade *pattbb;
apr_pool_t *tpool;
} injection_module_ctx;
#define AP_MAX_BUCKETS 1000
#define SEDSCAT(s1, s2, pool, buff, blen, repl) do { \
if (!s1) { \
s1 = apr_pstrmemdup(pool, buff, blen); \
} \
else { \
s2 = apr_pstrmemdup(pool, buff, blen); \
s1 = apr_pstrcat(pool, s1, s2, NULL); \
} \
s1 = apr_pstrcat(pool, s1, repl, NULL); \
} while (0)
#define SEDRMPATBCKT(b, offset, tmp_b, patlen) do { \
apr_bucket_split(b, offset); \
tmp_b = APR_BUCKET_NEXT(b); \
apr_bucket_split(tmp_b, patlen); \
b = APR_BUCKET_NEXT(tmp_b); \
apr_bucket_delete(tmp_b); \
} while (0)
/* END Inject Related Structs Globals*/
/* BEGIN Anticrawler Globals */
struct tree *timetable; // Our dynamic hash table
static unsigned long hash_table_size = DEFAULT_HASH_TBL_SIZE;
static int interval = DEFAULT_INTERVAL;
static int count = DEFAULT_COUNT;
static int blocking_period = DEFAULT_BLOCKING_PERIOD;
static char *email_notify = NULL;
static char *log_dir = NULL;
static char *system_command = NULL;
/* END Anticrawler Globals */
static void * create_timetable(apr_pool_t *p, server_rec *s) {
/* Create a new hit list (timetable) for this listener */
timetable = tree_create(hash_table_size);
}
/* Inject operation Configs */
static void *create_injection_dcfg(apr_pool_t *p, char *d) {
inject_dir_conf *dcfg =
(inject_dir_conf *) apr_pcalloc(p, sizeof (inject_dir_conf));
dcfg->patterns = apr_array_make(p, 10, sizeof (inject_pattern_t));
return dcfg;
}
static void *merge_injection_dcfg(apr_pool_t *p, void *basev, void *overv) {
inject_dir_conf *a =
(inject_dir_conf *) apr_pcalloc(p, sizeof (inject_dir_conf));
inject_dir_conf *base = (inject_dir_conf *) basev;
inject_dir_conf *over = (inject_dir_conf *) overv;
a->patterns = apr_array_append(p, over->patterns,
base->patterns);
return a;
}
/* End of Inject operation Configs */
static void do_pattmatch(ap_filter_t *f, apr_bucket *inb,
apr_bucket_brigade *mybb,
apr_pool_t *tmp_pool) {
int i;
int force_quick = 0;
ap_regmatch_t regm[AP_MAX_REG_MATCH];
apr_size_t bytes;
apr_size_t len;
apr_size_t fbytes;
const char *buff;
const char *repl;
char *scratch;
char *p;
char *s1;
char *s2;
apr_bucket *b;
apr_bucket *tmp_b;
apr_pool_t *tpool;
inject_dir_conf *cfg =
(inject_dir_conf *) ap_get_module_config(f->r->per_dir_config,
&anticrawl_module);
inject_pattern_t *script;
APR_BRIGADE_INSERT_TAIL(mybb, inb);
script = (inject_pattern_t *) cfg->patterns->elts;
apr_pool_create(&tpool, tmp_pool);
scratch = NULL;
fbytes = 0;
if (cfg->patterns->nelts == 1) {
force_quick = 1;
}
for (i = 0; i < cfg->patterns->nelts; i++) {
for (b = APR_BRIGADE_FIRST(mybb);
b != APR_BRIGADE_SENTINEL(mybb);
b = APR_BUCKET_NEXT(b)) {
if (APR_BUCKET_IS_METADATA(b)) {
continue;
}
if (apr_bucket_read(b, &buff, &bytes, APR_BLOCK_READ)
== APR_SUCCESS) {
s1 = NULL;
if (script->pattern) {
while ((repl = apr_strmatch(script->pattern, buff, bytes))) {
/* get offset into buff for pattern */
len = (apr_size_t) (repl - buff);
if (script->flatten && !force_quick) {
SEDSCAT(s1, s2, tmp_pool, buff, len,
script->replacement);
} else {
SEDRMPATBCKT(b, len, tmp_b, script->patlen);
tmp_b = apr_bucket_transient_create(script->replacement,
script->replen,
f->r->connection->bucket_alloc);
APR_BUCKET_INSERT_BEFORE(b, tmp_b);
}
len += script->patlen;
bytes -= len;
buff += len;
}
if (script->flatten && s1 && !force_quick) {
s2 = apr_pstrmemdup(tmp_pool, buff, bytes);
s1 = apr_pstrcat(tmp_pool, s1, s2, NULL);
tmp_b = apr_bucket_transient_create(s1, strlen(s1),
f->r->connection->bucket_alloc);
APR_BUCKET_INSERT_BEFORE(b, tmp_b);
apr_bucket_delete(b);
b = tmp_b;
}
} else if (script->regexp) {
if (!scratch || (bytes > (fbytes + 1))) {
fbytes = bytes + 1;
scratch = apr_palloc(tpool, fbytes);
}
/* reset pointer to the scratch space */
p = scratch;
memcpy(p, buff, bytes);
p[bytes] = '\0';
while (!ap_regexec(script->regexp, p,
AP_MAX_REG_MATCH, regm, 0)) {
/* first, grab the replacement string */
repl = ap_pregsub(tmp_pool, script->replacement, p,
AP_MAX_REG_MATCH, regm);
if (script->flatten && !force_quick) {
SEDSCAT(s1, s2, tmp_pool, p, regm[0].rm_so, repl);
} else {
len = (apr_size_t) (regm[0].rm_eo - regm[0].rm_so);
SEDRMPATBCKT(b, regm[0].rm_so, tmp_b, len);
tmp_b = apr_bucket_transient_create(repl,
strlen(repl),
f->r->connection->bucket_alloc);
APR_BUCKET_INSERT_BEFORE(b, tmp_b);
}
p += regm[0].rm_eo;
}
if (script->flatten && s1 && !force_quick) {
s1 = apr_pstrcat(tmp_pool, s1, p, NULL);
tmp_b = apr_bucket_transient_create(s1, strlen(s1),
f->r->connection->bucket_alloc);
APR_BUCKET_INSERT_BEFORE(b, tmp_b);
apr_bucket_delete(b);
b = tmp_b;
}
} else {
continue;
}
}
}
script++;
}
apr_pool_destroy(tpool);
return;
}
static int access_checker(request_rec *r) {
int ret = OK;
/* BEGIN Anticrawler Code */
mymutex_lock();
if (r->prev == NULL && r->main == NULL && timetable != NULL) {
char hash_key[2048];
struct tree_node *n;
time_t t = time(NULL);
/* First see if the IP itself is on Blacklist */
snprintf(hash_key, 2048, "%s_BLOCKED", r->connection->remote_ip);
n = tree_find(timetable, hash_key);
if (n != NULL) {
if (t - n->timestamp < blocking_period) {
ap_log_error("xx", 1, 1, 0, NULL, "IP found on blacklist: %s, counter= %ld", n->key, n->count);
/* If the IP is on "hold", make it wait longer in 403 land */
ret = HTTP_NOT_FOUND;
n->timestamp = time(NULL);
} else {
// if blocking period is over delete from Blacklist and insert into Hitlist
snprintf(hash_key, 2048, "%s_BLOCKED", r->connection->remote_ip);
tree_delete(timetable, hash_key);
tree_insert(timetable, r->connection->remote_ip);
}
/* Not on Blacklist, check hit stats */
} else {
/* IF Crawler Hits the Trap */
int dclen=strlen("/dontclick.html");
int rurilen=strlen(r->uri);
if (rurilen >= dclen)
if (strcmp(r->uri + rurilen - dclen , "/dontclick.html") == 0) {
ret = HTTP_NOT_FOUND;
ap_log_error("xx", 1, 1, 0, NULL, "IP hit the trap");
snprintf(hash_key, 2048, "%s_BLOCKED", r->connection->remote_ip);
tree_insert(timetable, hash_key);
n = tree_find(timetable, r->connection->remote_ip);
if (n != NULL) {
tree_delete(timetable, r->connection->remote_ip);
}
} else {
/* Has IP hit too much? */
n = tree_find(timetable, r->connection->remote_ip);
if (n != NULL) {
ap_log_error("xx", 1, 1, 0, NULL, "IP found on hitlist: %s, counter= %ld", n->key, n->count);
/* If IP is being hit too much, add to "hold" list and 403 */
if (t - n->timestamp < interval && n->count >= count) {
ap_log_error("xx", 1, 1, 0, NULL, "IP %s hits too much, counter= %ld", n->key, n->count);
ret = HTTP_NOT_FOUND;
snprintf(hash_key, 2048, "%s_BLOCKED", r->connection->remote_ip);
tree_insert(timetable, hash_key);
tree_delete(timetable, r->connection->remote_ip);
} else {
/* Reset our hit count list as necessary */
if (t - n->timestamp >= interval) {
n->count = 0;
ap_log_error("xx", 1, 1, 0, NULL, "IP found on hitlist: %s, but we set counter to = %ld", n->key, n->count);
n->timestamp = t; //DEBUG: Bunu ekledim
}
}
//n->timestamp = t; //Bunu kaldırıp üsttekini ekle
n->count++;
} else {
//ap_log_error("xx", 1, 1, 0, NULL,"IP could not be found on hitlist: %s, counter= %ld",n->key,n->count);
tree_insert(timetable, r->connection->remote_ip);
}
}
}
} /* if (r->prev == NULL && r->main == NULL && timetable != NULL) */
/* END Anticrawler Code */
/*
if (ret == HTTP_NOT_ACCEPTABLE && (ap_satisfies(r) != SATISFY_ANY || !ap_some_auth_required(r))) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
"client denied by server configuration: %s",
r->filename);
}*/
mymutex_unlock();
return ret;
}
static apr_status_t injection_filter(ap_filter_t *f, apr_bucket_brigade *bb) {
apr_size_t bytes;
apr_size_t len;
apr_size_t fbytes;
const char *buff;
const char *nl = NULL;
char *bflat;
apr_bucket *b;
apr_bucket *tmp_b;
apr_bucket_brigade *tmp_bb = NULL;
apr_status_t rv;
injection_module_ctx *ctx = f->ctx;
if (!ctx) {
f->ctx = ctx = apr_pcalloc(f->r->pool, sizeof (*ctx));
ctx->linebb = apr_brigade_create(f->r->pool, f->c->bucket_alloc);
ctx->linesbb = apr_brigade_create(f->r->pool, f->c->bucket_alloc);
ctx->pattbb = apr_brigade_create(f->r->pool, f->c->bucket_alloc);
ctx->passbb = apr_brigade_create(f->r->pool, f->c->bucket_alloc);
/* Create our temporary pool only once */
apr_pool_create(&(ctx->tpool), f->r->pool);
apr_table_unset(f->r->headers_out, "Content-Length");
}
/*
* Shortcircuit
*/
if (APR_BRIGADE_EMPTY(bb))
return APR_SUCCESS;
while ((b = APR_BRIGADE_FIRST(bb)) && (b != APR_BRIGADE_SENTINEL(bb))) {
if (APR_BUCKET_IS_EOS(b)) {
if (!APR_BRIGADE_EMPTY(ctx->linebb)) {
rv = apr_brigade_pflatten(ctx->linebb, &bflat,
&fbytes, ctx->tpool);
tmp_b = apr_bucket_transient_create(bflat, fbytes,
f->r->connection->bucket_alloc);
do_pattmatch(f, tmp_b, ctx->pattbb, ctx->tpool);
APR_BRIGADE_CONCAT(ctx->passbb, ctx->pattbb);
}
apr_brigade_cleanup(ctx->linebb);
APR_BUCKET_REMOVE(b);
APR_BRIGADE_INSERT_TAIL(ctx->passbb, b);
} else if (APR_BUCKET_IS_METADATA(b)) {
APR_BUCKET_REMOVE(b);
APR_BRIGADE_INSERT_TAIL(ctx->passbb, b);
} else {
rv = apr_bucket_read(b, &buff, &bytes, APR_BLOCK_READ);
if (rv != APR_SUCCESS || bytes == 0) {
apr_bucket_delete(b);
} else {
int num = 0;
while (bytes > 0) {
nl = memchr(buff, APR_ASCII_LF, bytes);
if (nl) {
len = (apr_size_t) (nl - buff) + 1;
/* split *after* the newline */
apr_bucket_split(b, len);
bytes -= len;
buff += len;
tmp_b = APR_BUCKET_NEXT(b);
APR_BUCKET_REMOVE(b);
if (!APR_BRIGADE_EMPTY(ctx->linebb)) {
APR_BRIGADE_INSERT_TAIL(ctx->linebb, b);
rv = apr_brigade_pflatten(ctx->linebb, &bflat,
&fbytes, ctx->tpool);
b = apr_bucket_transient_create(bflat, fbytes,
f->r->connection->bucket_alloc);
apr_brigade_cleanup(ctx->linebb);
}
do_pattmatch(f, b, ctx->pattbb, ctx->tpool);
for (b = APR_BRIGADE_FIRST(ctx->pattbb);
b != APR_BRIGADE_SENTINEL(ctx->pattbb);
b = APR_BUCKET_NEXT(b)) {
num++;
}
APR_BRIGADE_CONCAT(ctx->passbb, ctx->pattbb);
// for safety reasons flush bb
if (num > AP_MAX_BUCKETS) {
b = apr_bucket_flush_create(
f->r->connection->bucket_alloc);
APR_BRIGADE_INSERT_TAIL(ctx->passbb, b);
rv = ap_pass_brigade(f->next, ctx->passbb);
apr_brigade_cleanup(ctx->passbb);
num = 0;
apr_pool_clear(ctx->tpool);
if (rv != APR_SUCCESS)
return rv;
}
b = tmp_b;
} else {
//no newline
APR_BUCKET_REMOVE(b);
APR_BRIGADE_INSERT_TAIL(ctx->linebb, b);
bytes = 0;
}
}
}
}
if (!APR_BRIGADE_EMPTY(ctx->passbb)) {
rv = ap_pass_brigade(f->next, ctx->passbb);
apr_brigade_cleanup(ctx->passbb);
if (rv != APR_SUCCESS) {
apr_pool_clear(ctx->tpool);
return rv;
}
}
apr_pool_clear(ctx->tpool);
}
/* Anything left we want to save/setaside for the next go-around */
if (!APR_BRIGADE_EMPTY(ctx->linebb)) {
/*
* Provide ap_save_brigade with an existing empty brigade
* (ctx->linesbb) to avoid creating a new one.
*/
ap_save_brigade(f, &(ctx->linesbb), &(ctx->linebb), f->r->pool);
tmp_bb = ctx->linebb;
ctx->linebb = ctx->linesbb;
ctx->linesbb = tmp_bb;
}
return APR_SUCCESS;
}
static apr_status_t destroy_timetable(void *not_used) {
tree_destroy(timetable);
free(email_notify);
free(system_command);
}
/* BEGIN tree (Named Timestamp Tree) Functions */
static unsigned long tree_prime_list[tree_num_primes] = {
53ul, 97ul, 193ul, 389ul, 769ul,
1543ul, 3079ul, 6151ul, 12289ul, 24593ul,
49157ul, 98317ul, 196613ul, 393241ul, 786433ul,
1572869ul, 3145739ul, 6291469ul, 12582917ul, 25165843ul,
50331653ul, 100663319ul, 201326611ul, 402653189ul, 805306457ul,
1610612741ul, 3221225473ul, 4294967291ul
};
/* Find the numeric position in the hash table based on key and modulus */
long tree_hashcode(struct tree *tree, const char *key) {
unsigned long val = 0;
for (; *key; ++key) val = 5 * val + *key;
return (val % tree->size);
}
/* Creates a single node in the tree */
struct tree_node *tree_node_create(const char *key) {
char *node_key;
struct tree_node* node;
node = (struct tree_node *) malloc(sizeof (struct tree_node));
if (node == NULL) {
return NULL;
}
if ((node_key = strdup(key)) == NULL) {
free(node);
return NULL;
}
node->key = node_key;
node->timestamp = time(NULL);
node->next = NULL;
return (node);
}
/* Tree initializer */
struct tree *tree_create(long size) {
long i = 0;
struct tree *tree;
tree = (struct tree *) malloc(sizeof (struct tree));
if (tree == NULL)
return NULL;
while (tree_prime_list[i] < size) {
i++;
}
tree->size = tree_prime_list[i];
tree->items = 0;
tree->tbl = (struct tree_node **) calloc(tree->size, sizeof (struct tree_node *));
if (tree->tbl == NULL) {
free(tree);
return NULL;
}
return (tree);
}
/* Find an object in the tree */
struct tree_node *tree_find(struct tree *tree, const char *key) {
long hash_code;
struct tree_node *node;
if (tree == NULL) return NULL;
hash_code = tree_hashcode(tree, key);
node = tree->tbl[hash_code];
while (node) {
if (!strcmp(key, node->key)) {
return (node);
}
node = node->next;
}
return ((struct tree_node *) NULL);
}
void write_to_file() {
long i;
FILE *f = fopen("/dev/shm/anticrawl-data", "w");
for (i = 0; i < timetable->size; i++) {
if (timetable->tbl[i] != NULL) {
fprintf(f, "%s\n", timetable->tbl[i]->key);
fprintf(f, "%ld\n", timetable->tbl[i]->count);
fprintf(f, "%ld\n", timetable->tbl[i]->timestamp);
}
}
fprintf(f, "EOF\n");
fclose(f);
}
void read_from_file() {
char *key = malloc(80 * sizeof (char));
long count;
time_t timestamp;
FILE *f = fopen("/dev/shm/anticrawl-data", "r");
if (f == NULL)
return;
int finished = 0;
timetable->tbl = (struct tree_node **) calloc(timetable->size, sizeof (struct tree_node *));
while (!finished) {
fscanf(f, "%s", key);
if (strcmp("EOF", key) == 0) {
finished = 1;
} else {
fscanf(f, "%ld", &count);
fscanf(f, "%ld", ×tamp);
tree_insert(timetable, key);
struct tree_node *t = tree_find(timetable, key);
t->count = count;
t->timestamp = timestamp;
}
}
fclose(f);
}
void mymutex_lock() {
ap_log_error(APLOG_MARK, APLOG_INFO, 0, 0, "mutex lock start");
int rv = apr_global_mutex_lock(mutex);
if (rv != APR_SUCCESS) {
char *buf = malloc(sizeof (char) *200);
char* r = apr_strerror(rv,
buf,
200
);
ap_log_error("xx", 1, 1, 0, NULL, "apr_global_mutex_lock failed %s", r);
} else
read_from_file();
ap_log_error(APLOG_MARK, APLOG_INFO, 0, 0, "mutex lock end");
}
void mymutex_unlock() {
write_to_file();
int rv = apr_global_mutex_unlock(mutex);
if (rv != APR_SUCCESS) {
ap_log_error("xx", 1, 1, 0, NULL, "apr_global_mutex_lock failed");
}
}
/* Insert a node into the tree */
struct tree_node *tree_insert(struct tree *tree, const char *key) {
long hash_code;
struct tree_node *parent;
struct tree_node *node;
struct tree_node *new_node = NULL;
struct tree_node *result = NULL;
time_t timestamp = time(NULL);
if (tree == NULL)
result = NULL;
else {
hash_code = tree_hashcode(tree, key);
parent = NULL;
node = tree->tbl[hash_code];
while (node != NULL) {
if (strcmp(key, node->key) == 0) {
new_node = node;
node = NULL;
}
if (new_node == NULL) {
parent = node;
node = node->next;
}
}
if (new_node != NULL) {
new_node->timestamp = timestamp;
new_node->count = 1;
result = new_node;
} else {
/* Create a new node */
new_node = tree_node_create(key);
new_node->timestamp = timestamp;
//new_node->timestamp = 0;
new_node->count = 1; //DEBUG: Bunu ekledim ust satiri comment ettim
tree->items++;
/* Insert */
if (parent) { /* Existing parent */
parent->next = new_node;
result = new_node; /* Return the locked node */
} else {
/* No existing parent; add directly to hash table */
tree->tbl[hash_code] = new_node;
result = new_node;
}
}
}
return result;
}
/* Tree destructor */
int tree_destroy(struct tree *tree) {
struct tree_node *node, *next;
struct tree_c c;
int result;
mymutex_lock();
if (tree == NULL) {
result = -1;
} else {
node = c_tree_first(tree, &c);
while (node != NULL) {
next = c_tree_next(tree, &c);
tree_delete(tree, node->key);
node = next;
}
free(tree->tbl);
free(tree);
tree = (struct tree *) NULL;
result = 0;
}
mymutex_unlock();
return result;
}
/* Delete a single node in the tree */
int tree_delete(struct tree *tree, const char *key) {
long hash_code;
struct tree_node *parent = NULL;
struct tree_node *node;
struct tree_node *del_node = NULL;
int result;
if (tree == NULL) {
result = -1;
} else {
hash_code = tree_hashcode(tree, key);
node = tree->tbl[hash_code];
while (node != NULL) {
if (strcmp(key, node->key) == 0) {
del_node = node;
node = NULL;
}
if (del_node == NULL) {
parent = node;
node = node->next;
}
}
if (del_node != NULL) {
if (parent) {
parent->next = del_node->next;
} else {
tree->tbl[hash_code] = del_node->next;
}
free(del_node->key);
free(del_node);
tree->items--;
result = 0;
} else
result = -5;
}
return result;
}
/* Point cursor to first item in tree */
struct tree_node *c_tree_first(struct tree *tree, struct tree_c *c) {
c->iter_index = 0;
c->iter_next = (struct tree_node *) NULL;
return (c_tree_next(tree, c));
}
/* Point cursor to next iteration in tree */
struct tree_node *c_tree_next(struct tree *tree, struct tree_c *c) {
long index;
struct tree_node *node = c->iter_next;
if (tree == NULL) return NULL;
if (node) {
if (node != NULL) {
c->iter_next = node->next;
return (node);
}
}
if (!node) {
while (c->iter_index < tree->size) {
index = c->iter_index++;
if (tree->tbl[index]) {
c->iter_next = tree->tbl[index]->next;
return (tree->tbl[index]);
}
}
}
return ((struct tree_node *) NULL);
}
/* END tree (Named Pointer Tree) Functions */
/* BEGIN Configuration Functions */
static const char *
get_hash_tbl_size(cmd_parms *cmd, void *dconfig, const char *value) {
long n = strtol(value, NULL, 0);
if (n <= 0) {
hash_table_size = DEFAULT_HASH_TBL_SIZE;
} else {
hash_table_size = n;
}
return NULL;
}
static const char *
get_count(cmd_parms *cmd, void *dconfig, const char *value) {
long n = strtol(value, NULL, 0);
if (n <= 0) {
count = DEFAULT_COUNT;
} else {
count = n;
}
return NULL;
}
static const char *
get_interval(cmd_parms *cmd, void *dconfig, const char *value) {
long n = strtol(value, NULL, 0);
if (n <= 0) {
interval = DEFAULT_INTERVAL;
} else {
interval = n;
}
return NULL;
}
static const char *
get_blocking_period(cmd_parms *cmd, void *dconfig, const char *value) {
long n = strtol(value, NULL, 0);
if (n <= 0) {
blocking_period = DEFAULT_BLOCKING_PERIOD;
} else {
blocking_period = n;
}
return NULL;
}
static const char *
get_log_dir(cmd_parms *cmd, void *dconfig, const char *value) {
if (value != NULL && value[0] != 0) {
if (log_dir != NULL)
free(log_dir);
log_dir = strdup(value);
}
return NULL;
}
static const char *
get_email_notify(cmd_parms *cmd, void *dconfig, const char *value) {
if (value != NULL && value[0] != 0) {
if (email_notify != NULL)
free(email_notify);
email_notify = strdup(value);
}
return NULL;
}
static const char *
get_system_command(cmd_parms *cmd, void *dconfig, const char *value) {
if (value != NULL && value[0] != 0) {
if (system_command != NULL)
free(system_command);
system_command = strdup(value);
}
return NULL;
}
static const char *
set_pattern(cmd_parms *cmd, void *cfg, const char *line) {
char *from = NULL;
char *to = NULL;
char *flags = NULL;
char *ourline;
char delim;
inject_pattern_t *nscript;
int is_pattern = 0;
int ignore_case = 0;
int flatten = 1;
ap_regex_t *r = NULL;
if (apr_tolower(*line) != 's') {
return "Bad Substitute format, must be an s/// pattern";
}
ourline = apr_pstrdup(cmd->pool, line);
delim = *++ourline;
if (delim)
from = ++ourline;
if (from) {
if (*ourline != delim) {
while (*++ourline && *ourline != delim);
}
if (*ourline) {
*ourline = '\0';
to = ++ourline;
}
}
if (to) {
if (*ourline != delim) {
while (*++ourline && *ourline != delim);
}
if (*ourline) {
*ourline = '\0';
flags = ++ourline;
}
}
if (!delim || !from || !*from || !to) {
return "Bad Substitute format, must be a complete s/// pattern";
}
if (flags) {
while (*flags) {
delim = apr_tolower(*flags); /* re-use */
if (delim == 'i')
ignore_case = 1;
else if (delim == 'n')
is_pattern = 1;
else if (delim == 'f')
flatten = 1;
else if (delim == 'q')