Akkariin/proxychains-ng
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Code Issues Releases Wiki Activity

replace hostent lookup with better performing in-memory copy.

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the central dns resolver function proxy_gethostbyname() used
to iterate over the gethostent() db (/etc/hosts) on each dns
request.
since this is not threadsafe, we synchronized access to it
previously using mutexes. the parsing of this file is slow,
and blocking all threads to do it even moreso.
since gethostent_r() is only available on a few platforms,
i decided to read the hostent db once and then use a quick
in-memory lookup on further usage.

+ some further refactoring.
This commit is contained in:
rofl0r
2012-11-08 01:18:19 +01:00
Unverified
parent c698d48c03
commit af5c6f0c6a
11 changed files with 208 additions and 39 deletions
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src/allocator_thread.c
+4 -20
View File
@@ -13,13 +13,8 @@
#include "debug.h"
#include "ip_type.h"
#include "mutex.h"
struct stringpool mem;
static char *at_dumpstring(char* s, size_t len) {
PFUNC();
return stringpool_add(&mem, s, len);
}
#include "hash.h"
#include "stringdump.h"
/* stuff for our internal translation table */
@@ -38,16 +33,6 @@ pthread_mutex_t internal_ips_lock;
internal_ip_lookup_table *internal_ips = NULL;
internal_ip_lookup_table internal_ips_buf;
uint32_t dalias_hash(char *s0) {
unsigned char *s = (void *) s0;
uint_fast32_t h = 0;
while(*s) {
h = 16 * h + *s++;
h ^= h >> 24 & 0xf0;
}
return h & 0xfffffff;
}
uint32_t index_from_internal_ip(ip_type internalip) {
PFUNC();
ip_type tmp = internalip;
@@ -113,7 +98,7 @@ static ip_type ip_from_internal_list(char* name, size_t len) {
goto err_plus_unlock;
string_hash_tuple tmp = { 0 };
new_mem = at_dumpstring((char*) &tmp, sizeof(string_hash_tuple));
new_mem = dumpstring((char*) &tmp, sizeof(string_hash_tuple));
if(!new_mem)
goto oom;
@@ -122,7 +107,7 @@ static ip_type ip_from_internal_list(char* name, size_t len) {
internal_ips->list[internal_ips->counter] = new_mem;
internal_ips->list[internal_ips->counter]->hash = hash;
new_mem = at_dumpstring((char*) name, len + 1);
new_mem = dumpstring((char*) name, len + 1);
if(!new_mem) {
internal_ips->list[internal_ips->counter] = 0;
@@ -285,7 +270,6 @@ void at_init(void) {
memset(internal_ips, 0, sizeof *internal_ips);
initpipe(req_pipefd);
initpipe(resp_pipefd);
stringpool_init(&mem);
pthread_attr_init(&allocator_thread_attr);
pthread_attr_setstacksize(&allocator_thread_attr, 16 * 1024);
pthread_create(&allocator_thread, &allocator_thread_attr, threadfunc, 0);