Fix merge error.

Hi ! Nice job with localnet, just what I was needing, here is just a small fix. Hope this helps.

Makefile

@@ -8,6 +8,7 @@
 prefix = /usr/local
 includedir = $(prefix)/include
 libdir = $(prefix)/lib
+confdir = $(prefix)/etc
 
 exec_prefix = $(prefix)
 bindir = $(exec_prefix)/bin
@@ -16,33 +17,41 @@ SRCS = $(sort $(wildcard src/*.c))
 OBJS = $(SRCS:.c=.o)
 LOBJS = src/core.o src/libproxychains.o
 
-CFLAGS  += -Wall -O0 -g -std=c99 -D_GNU_SOURCE -pipe -DTHREAD_SAFE
+CCFLAGS  = -Wall -O0 -g -std=c99 -D_GNU_SOURCE -pipe -DTHREAD_SAFE -Werror
 LDFLAGS = -shared -fPIC -ldl -lpthread
 INC     = 
 PIC     = -fPIC
 AR      = $(CROSS_COMPILE)ar
 RANLIB  = $(CROSS_COMPILE)ranlib
 
-LDSO_PATHNAME = libproxychains4.so
+LDSO_SUFFIX = so
+LD_SET_SONAME = -Wl,-soname=
+INSTALL_FLAGS = -D -m
+
+-include config.mak
+
+LDSO_PATHNAME = libproxychains4.$(LDSO_SUFFIX)
 
 SHARED_LIBS = $(LDSO_PATHNAME)
 ALL_LIBS = $(SHARED_LIBS)
 PXCHAINS = proxychains4
 ALL_TOOLS = $(PXCHAINS)
 
--include config.mak
 
-CFLAGS+=$(USER_CFLAGS)
-CFLAGS_MAIN=-DLIB_DIR=\"$(libdir)\"
+CCFLAGS+=$(USER_CFLAGS) $(MAC_CFLAGS)
+LDFLAGS+=$(USER_LDFLAGS) $(MAC_LDFLAGS)
+CXXFLAGS+=$(CCFLAGS) $(USER_CFLAGS) $(MAC_CFLAGS)
+CFLAGS_MAIN=-DLIB_DIR=\"$(libdir)\" -DINSTALL_PREFIX=\"$(prefix)\" -DDLL_NAME=\"$(LDSO_PATHNAME)\"
 
 
 all: $(ALL_LIBS) $(ALL_TOOLS)
 
 #install: $(ALL_LIBS:lib/%=$(DESTDIR)$(libdir)/%) $(DESTDIR)$(LDSO_PATHNAME)
-install: 
-	install -D -m 755 $(ALL_TOOLS) $(bindir)/
-	install -D -m 644 $(ALL_LIBS) $(libdir)/
-	install -D -m 644 src/proxychains.conf $(prefix)/etc/
+install:
+	install -d $(DESTDIR)/$(bindir) $(DESTDIR)/$(libdir) $(DESTDIR)/$(confdir) $(DESTDIR)/$(includedir)
+	install $(INSTALL_FLAGS) 755 $(ALL_TOOLS) $(DESTDIR)/$(bindir)/
+	install $(INSTALL_FLAGS) 644 $(ALL_LIBS) $(DESTDIR)/$(libdir)/
+	install $(INSTALL_FLAGS) 644 src/proxychains.conf $(DESTDIR)/$(confdir)
 
 clean:
 	rm -f $(ALL_LIBS)
@@ -50,13 +59,12 @@ clean:
 	rm -f $(OBJS)
 
 %.o: %.c
-	$(CC) $(CFLAGS) $(CFLAGS_MAIN) $(INC) $(PIC) -c -o $@ $<
+	$(CC) $(CCFLAGS) $(CFLAGS_MAIN) $(INC) $(PIC) -c -o $@ $<
 
 $(LDSO_PATHNAME): $(LOBJS)
-	$(CC) $(LDFLAGS) -Wl,-soname=$(LDSO_PATHNAME) -o $@ $(LOBJS)
+	$(CC) $(LDFLAGS) $(LD_SET_SONAME)$(LDSO_PATHNAME) -o $@ $(LOBJS)
 
 $(ALL_TOOLS): $(OBJS)
 	$(CC) src/main.o -o $(PXCHAINS)
 
-
 .PHONY: all clean install

TODO

@@ -1,8 +1,6 @@
-ProxyChains ver 3.1 TODO
+ProxyChains ver 4.0 TODO
 ===================
 
-   stable DNS resolver .... currently gnu dig is used, which is an ugly hack
-	also it is required to link it with the same libc as proxychains
 	
    hooks for reentrant dns functions, i.e. gethostbyaddr_r
 

configure

@@ -11,14 +11,19 @@ spliteq() {
 
 parsearg() {
 	case "$1" in
-	--prefix=*) prefix=$(spliteq "$1");;
+	--prefix=*) prefix=`spliteq $1`;;
 	--exec_prefix=*) exec_prefix=`spliteq $1`;;
 	--bindir=*) bindir=`spliteq $1`;;
 	--libdir=*) libdir=`spliteq $1`;;
 	--includedir=*) includedir=`spliteq $1`;;
+	--sysconfdir=*) sysconfdir=`spliteq $1`;;
 	esac
 }
 
+ismac() {
+	uname -s | grep Darwin
+}
+
 while true ; do
 	case $1 in
 	-*) parsearg "$1"; shift;;
@@ -26,23 +31,27 @@ while true ; do
 	esac
 done
 
-if [ ! $exec_prefix ] ; then
+if [ -z "$exec_prefix" ] ; then
 	exec_prefix=$prefix
 fi
 
-if [ ! $libdir ] ; then
+if [ -z "$libdir" ] ; then
 	libdir=$prefix/lib
 fi
 
-if [ ! $includedir ] ; then
+if [ -z "$includedir" ] ; then
 	includedir=$prefix/include
 fi
 
-if [ ! $bindir ] ; then
+if [ -z "$sysconfdir" ] ; then
+	sysconfdir=$prefix/etc
+fi
+
+if [ -z "$bindir" ] ; then
 	bindir=$exec_prefix/bin
 fi
 
-if [ ! $CC ] ; then
+if [ -z "$CC" ] ; then
 	CC=cc
 fi
 
@@ -54,6 +63,14 @@ echo exec_prefix=$exec_prefix>>config.mak
 echo bindir=$bindir>>config.mak
 echo libdir=$libdir>>config.mak
 echo includedir=$includedir>>config.mak
+echo sysconfdir=$sysconfdir>>config.mak
+if ismac ; then
+	echo LDSO_SUFFIX=dylib>>config.mak
+	echo MAC_CFLAGS+=-DIS_MAC=1 -arch x86_64 -arch i386 >>config.mak
+	echo MAC_LDFLAGS+=-arch x86_64 -arch i386 >>config.mak
+	echo LD_SET_SONAME=-Wl,-install_name,>>config.mak
+	echo INSTALL_FLAGS=-m>>config.mak
+fi
 
 echo done, now run make \&\& make install
 

src/core.h

@@ -18,7 +18,7 @@
 #ifndef __CORE_HEADER
 #define __CORE_HEADER
 #define BUFF_SIZE 8*1024  // used to read responses from proxies.
-#define     MAX_LOCALNET 1024
+#define     MAX_LOCALNET 64
 
 typedef union {
 	unsigned char octet[4];
@@ -37,9 +37,17 @@ typedef struct {
 } internal_ip_lookup_table;
 
 extern internal_ip_lookup_table internal_ips;
+
 #ifdef THREAD_SAFE
 #include <pthread.h>
-extern pthread_mutex_t internal_ips_lock;
+pthread_mutex_t internal_ips_lock;
+# define MUTEX_LOCK(x) pthread_mutex_lock(x)
+# define MUTEX_UNLOCK(x) pthread_mutex_unlock(x)
+# define MUTEX_INIT(x,y) pthread_mutex_init(x, y)
+#else
+# define MUTEX_LOCK(x)
+# define MUTEX_UNLOCK(x)
+# define MUTEX_INIT(x,y)
 #endif
 
 /*error codes*/
@@ -52,7 +60,6 @@ typedef enum {
 	BLOCKED  //  target's port blocked on last proxy in the chain
 } ERR_CODE;
 
-
 typedef enum {
 	HTTP_TYPE,
 	SOCKS4_TYPE,
@@ -91,27 +98,11 @@ typedef struct {
 	char pass[256];
 } proxy_data;
 
-typedef struct {
-	proxy_data *pd;
-	chain_type ct;
-	unsigned int proxy_count;
-	int sock;
-	struct sockaddr addr;
-	int flags;
-} thread_arg;
-
-int connect_proxy_chain (
-	int sock,
-	ip_type target_ip,
-	unsigned short target_port,
-	proxy_data * pd,
-	unsigned int proxy_count,
-	chain_type ct,
-	unsigned int max_chain );
+int connect_proxy_chain (int sock, ip_type target_ip, unsigned short target_port,
+			 proxy_data * pd, unsigned int proxy_count, chain_type ct,
+			 unsigned int max_chain );
 
 int proxychains_write_log(char *str,...);
-struct hostent* proxy_gethostbyname(const char *name);
-
 
 typedef int (*connect_t)(int, const struct sockaddr *, socklen_t);
 connect_t true_connect;
@@ -130,22 +121,23 @@ freeaddrinfo_t true_freeaddrinfo;
 typedef int (*getnameinfo_t) (const struct sockaddr *,
 		socklen_t, char *,
 		socklen_t, char *,
-		socklen_t, unsigned int);
+		socklen_t, int);
 getnameinfo_t true_getnameinfo;
 
 typedef struct hostent *(*gethostbyaddr_t) (const void *, socklen_t, int);
 gethostbyaddr_t true_gethostbyaddr;
 
+struct hostent* proxy_gethostbyname(const char *name);
+
 int proxy_getaddrinfo(const char *node, const char *service,
 		                const struct addrinfo *hints,
 				                struct addrinfo **res);
 
-struct hostent* proxy_gethostbyname(const char *name);
 
 #ifdef DEBUG
 # define PDEBUG(fmt, args...) fprintf(stderr,"DEBUG:"fmt, ## args)
 #else
-# define PDEBUG(fmt, args...)
+# define PDEBUG(fmt, args...) do {} while (0)
 #endif
 
-#endif 
+#endif

src/libproxychains.c

@@ -18,20 +18,20 @@
 #undef _GNU_SOURCE
 #define _GNU_SOURCE
 
+#include <sys/types.h>
+
+#include <dlfcn.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <netdb.h>
 #include <stdio.h>
-#include <unistd.h>
 #include <stdlib.h>
 #include <string.h>
-#include <errno.h>
-#include <netdb.h>
+#include <unistd.h>
 
 #include <netinet/in.h>
 #include <arpa/inet.h>
-#include <sys/types.h>
 #include <sys/socket.h>
-#include <fcntl.h>
-#include <dlfcn.h>
-
 
 #include "core.h"
 #include "common.h"
@@ -41,145 +41,118 @@
 #define     SOCKADDR_2(x)     (satosin(x)->sin_addr)
 #define     SOCKPORT(x)     (satosin(x)->sin_port)
 #define     SOCKFAMILY(x)     (satosin(x)->sin_family)
-#define     MAX_CHAIN 30*1024
+#define     MAX_CHAIN 512
 
 int tcp_read_time_out;
 int tcp_connect_time_out;
-chain_type proxychains_ct;
-proxy_data proxychains_pd[MAX_CHAIN];
-unsigned int proxychains_proxy_count = 0;
 int proxychains_got_chain_data = 0;
-unsigned int proxychains_max_chain = 1;
 int proxychains_quiet_mode = 0;
 int proxychains_resolver = 0;
-static int init_l = 0;
+
+unsigned int proxychains_proxy_count = 0;
+unsigned int proxychains_max_chain = 1;
+unsigned int remote_dns_subnet = 224;
+
 localaddr_arg localnet_addr[MAX_LOCALNET];
+chain_type proxychains_ct;
+proxy_data proxychains_pd[MAX_CHAIN];
+
 size_t num_localnet_addr = 0;
 
-static inline void get_chain_data(proxy_data *pd, unsigned int *proxy_count,
-	chain_type *ct);
-static void init_lib(void);
-
-static void init_lib(void)
-{
 #ifdef THREAD_SAFE
-	pthread_mutex_init(&internal_ips_lock, NULL);
+pthread_once_t init_once = PTHREAD_ONCE_INIT;
 #endif
-	/* read the config file */
-	get_chain_data(proxychains_pd, &proxychains_proxy_count, &proxychains_ct);
-	
-	proxychains_write_log(LOG_PREFIX "DLL init\n");
-	
-	true_connect = (connect_t) dlsym(RTLD_NEXT, "connect");
+static int init_l = 0;
 
-	if (!true_connect) {
-		fprintf(stderr, "Cannot load symbol 'connect' %s\n", dlerror());
+static inline void get_chain_data(proxy_data * pd, unsigned int *proxy_count, chain_type * ct);
+
+static void load_sym(void** funcptr, char* symname, void* proxyfunc) {
+
+	*funcptr = dlsym(RTLD_NEXT, symname);
+
+	if(!(*funcptr)) {
+		fprintf(stderr, "Cannot load symbol '%s' %s\n", symname, dlerror());
 		exit(1);
 	} else {
-		#ifdef DEBUG
-		PDEBUG( "loaded symbol 'connect'"
-		" real addr %p  wrapped addr %p\n",
-		true_connect, connect);
-		#endif
+		PDEBUG("loaded symbol '%s'" " real addr %p  wrapped addr %p\n", symname, (*funcptr), proxyfunc);
 	}
-	if(connect==true_connect) {
-		#ifdef DEBUG
+	if((*funcptr) == proxyfunc) {
 		PDEBUG("circular reference detected, aborting!\n");
-		#endif
 		abort();
 	}
-	
-	true_gethostbyname = (gethostbyname_t) 
-		dlsym(RTLD_NEXT, "gethostbyname");
+}
 
-	if (!true_gethostbyname) {
-		fprintf(stderr, "Cannot load symbol 'gethostbyname' %s\n", 
-				dlerror());
-		exit(1);
-	} else {
-		#ifdef DEBUG
-		PDEBUG( "loaded symbol 'gethostbyname'"
-		" real addr %p  wrapped addr %p\n",
-		true_gethostbyname, gethostbyname);
-		#endif
-	}
-	true_getaddrinfo = (getaddrinfo_t) 
-		dlsym(RTLD_NEXT, "getaddrinfo");
+#define INIT() init_lib_wrapper(__FUNCTION__)
 
-	if (!true_getaddrinfo) {
-		fprintf(stderr, "Cannot load symbol 'getaddrinfo' %s\n", 
-				dlerror());
-		exit(1);
-	} else {
-		#ifdef DEBUG
-		PDEBUG( "loaded symbol 'getaddrinfo'"
-			" real addr %p  wrapped addr %p\n",
-			true_getaddrinfo, getaddrinfo);
-		#endif
-	}
-	true_freeaddrinfo = (freeaddrinfo_t) 
-		dlsym(RTLD_NEXT, "freeaddrinfo");
+static void do_init(void) {
+	static const struct override_info {
+		void* funcptr;
+		char* symname;
+		void* proxyfunc;
+	} override_symbols[] = {
+		#define SYM_ENTRY(X) { .funcptr = &true_ ## X,  .symname = # X, .proxyfunc = X,}
+		SYM_ENTRY(connect),
+		SYM_ENTRY(gethostbyname),
+		SYM_ENTRY(getaddrinfo),
+		SYM_ENTRY(freeaddrinfo),
+		SYM_ENTRY(gethostbyaddr),
+		SYM_ENTRY(getnameinfo),
+		#undef SYM_ENTRY
+	};
+	unsigned i;
+	MUTEX_INIT(&internal_ips_lock, NULL);
+	/* read the config file */
+	get_chain_data(proxychains_pd, &proxychains_proxy_count, &proxychains_ct);
 
-	if (!true_freeaddrinfo) {
-		fprintf(stderr, "Cannot load symbol 'freeaddrinfo' %s\n", 
-				dlerror());
-		exit(1);
-	} else {
-		#ifdef DEBUG
-		PDEBUG( "loaded symbol 'freeaddrinfo'"
-			" real addr %p  wrapped addr %p\n",
-			true_freeaddrinfo, freeaddrinfo);
-		#endif
-	}
-	true_gethostbyaddr = (gethostbyaddr_t) 
-		dlsym(RTLD_NEXT, "gethostbyaddr");
+	proxychains_write_log(LOG_PREFIX "DLL init\n");
 
-	if (!true_gethostbyaddr) {
-		fprintf(stderr, "Cannot load symbol 'gethostbyaddr' %s\n", 
-				dlerror());
-		exit(1);
-	} else {
-		#ifdef DEBUG
-		PDEBUG( "loaded symbol 'gethostbyaddr'"
-			" real addr %p  wrapped addr %p\n",
-			true_gethostbyaddr, gethostbyaddr);
-		#endif
-	}
-	true_getnameinfo = (getnameinfo_t) 
-		dlsym(RTLD_NEXT, "getnameinfo");
-
-	if (!true_getnameinfo) {
-		fprintf(stderr, "Cannot load symbol 'getnameinfo' %s\n", 
-				dlerror());
-		exit(1);
-	} else {
-		#ifdef DEBUG
-		PDEBUG( "loaded symbol 'getnameinfo'"
-			" real addr %p  wrapped addr %p\n",
-			true_getnameinfo, getnameinfo);
-		#endif
+	for (i = 0; i < (sizeof(override_symbols) / sizeof(override_symbols[0])); i++) {
+		load_sym(override_symbols[i].funcptr, override_symbols[i].symname, override_symbols[i].proxyfunc);
 	}
 	init_l = 1;
 }
 
-static inline void get_chain_data(
-			proxy_data *pd,
-			unsigned int *proxy_count,
-			chain_type *ct)
-{
-	int count=0,port_n=0,list=0;
-	char buff[1024],type[1024],host[1024],user[1024];
+static void init_lib_wrapper(const char* caller) {
+#ifndef DEBUG
+	(void) caller;
+#endif
+#ifndef THREAD_SAFE
+	if(init_l) return;
+	PDEBUG("%s called from %s\n", __FUNCTION__,  caller);
+	do_init();
+#else
+	if(!init_l) PDEBUG("%s called from %s\n", __FUNCTION__,  caller);
+	pthread_once(&init_once, do_init);
+#endif
+}
+
+/* if we use gcc >= 3, we can instruct the dynamic loader
+ * to call init_lib at link time. otherwise it gets loaded
+ * lazily, which has the disadvantage that there's a potential
+ * race condition if 2 threads call it before init_l is set
+ * and PTHREAD support was disabled */
+#if __GNUC__ > 2
+__attribute__((constructor))
+static void gcc_init(void) {
+	INIT();
+}
+#endif
+
+/* get configuration from config file */
+static void get_chain_data(proxy_data * pd, unsigned int *proxy_count, chain_type * ct) {
+	int count = 0, port_n = 0, list = 0;
+	char buff[1024], type[1024], host[1024], user[1024];
 	char *env;
 	char local_in_addr_port[32];
 	char local_in_addr[32], local_in_port[32], local_netmask[32];
-	FILE* file;
+	FILE *file;
 
 	if(proxychains_got_chain_data)
-	return;
+		return;
 
 	//Some defaults
-	tcp_read_time_out = 4*1000;
-	tcp_connect_time_out = 10*1000;
+	tcp_read_time_out = 4 * 1000;
+	tcp_connect_time_out = 10 * 1000;
 	*ct = DYNAMIC_TYPE;
 
 	/*
@@ -188,113 +161,119 @@ static inline void get_chain_data(
 	 */
 	env = getenv(PROXYCHAINS_CONF_FILE_ENV_VAR);
 
-	snprintf(buff,256,"%s/.proxychains/proxychains.conf",getenv("HOME"));
+	snprintf(buff, 256, "%s/.proxychains/proxychains.conf", getenv("HOME"));
+
+	if(!env || (!(file = fopen(env, "r"))))
+		if(!(file = fopen("./proxychains.conf", "r")))
+			if(!(file = fopen(buff, "r")))
+				if(!(file = fopen("/etc/proxychains.conf", "r"))) {
+					perror("Can't locate proxychains.conf");
+					exit(1);
+				}
 
-	if(!env || (!(file=fopen(env,"r"))))
-	if(!(file=fopen("./proxychains.conf","r")))
-	if(!(file=fopen(buff,"r")))
-	if(!(file=fopen("/etc/proxychains.conf","r")))
-	{
-		perror("Can't locate proxychains.conf");
-		exit(1);
-	}
-	
 	env = getenv(PROXYCHAINS_QUIET_MODE_ENV_VAR);
-	if(env && *env == '1') proxychains_quiet_mode = 1;
+	if(env && *env == '1')
+		proxychains_quiet_mode = 1;
 
-	while(fgets(buff,sizeof(buff),file)) {
-		if(buff[0] != '\n' && buff[strspn(buff," ")]!='#') {
+	while(fgets(buff, sizeof(buff), file)) {
+		if(buff[0] != '\n' && buff[strspn(buff, " ")] != '#') {
+			/* proxylist has to come last */
 			if(list) {
+				if(count >= MAX_CHAIN)
+					break;
+
 				memset(&pd[count], 0, sizeof(proxy_data));
-				
+
 				pd[count].ps = PLAY_STATE;
 				port_n = 0;
-				
-				sscanf(buff,"%s %s %d %s %s", type, host, &port_n,
-					pd[count].user, pd[count].pass);
-				
+
+				sscanf(buff, "%s %s %d %s %s", type, host, &port_n, pd[count].user, pd[count].pass);
+
 				pd[count].ip.as_int = (uint32_t) inet_addr(host);
-				pd[count].port = htons((unsigned short)port_n);
-				
-				if(!strcmp(type,"http")) {
+				pd[count].port = htons((unsigned short) port_n);
+
+				if(!strcmp(type, "http")) {
 					pd[count].pt = HTTP_TYPE;
-				} else if(!strcmp(type,"socks4")) {
+				} else if(!strcmp(type, "socks4")) {
 					pd[count].pt = SOCKS4_TYPE;
-				} else if(!strcmp(type,"socks5")) {
+				} else if(!strcmp(type, "socks5")) {
 					pd[count].pt = SOCKS5_TYPE;
-				} else 
+				} else
 					continue;
-				
-				if(pd[count].ip.as_int && port_n &&
-				   pd[count].ip.as_int != (uint32_t) -1)
-					if(++count==MAX_CHAIN)
-						break;
-			 } else {
-				if(strstr(buff,"[ProxyList]")) {
-					list=1;
-				} else if(strstr(buff,"random_chain")) {
-					*ct=RANDOM_TYPE;
-				} else if(strstr(buff,"strict_chain")) {
-					*ct=STRICT_TYPE;
-				} else if(strstr(buff,"dynamic_chain")) {
-					*ct=DYNAMIC_TYPE;
-				} else if(strstr(buff,"tcp_read_time_out")){
-					sscanf(buff,"%s %d",user,&tcp_read_time_out) ;
-				} else if(strstr(buff,"tcp_connect_time_out")){
-					sscanf(buff,"%s %d",user,&tcp_connect_time_out) ;
-				} else if(strstr(buff,"localnet")) {
-					if (sscanf(buff,"%s %21[^/]/%15s", user,
-						local_in_addr_port, local_netmask) < 3) {
+
+				if(pd[count].ip.as_int && port_n && pd[count].ip.as_int != (uint32_t) - 1)
+					count++;
+			} else {
+				if(strstr(buff, "[ProxyList]")) {
+					list = 1;
+				} else if(strstr(buff, "random_chain")) {
+					*ct = RANDOM_TYPE;
+				} else if(strstr(buff, "strict_chain")) {
+					*ct = STRICT_TYPE;
+				} else if(strstr(buff, "dynamic_chain")) {
+					*ct = DYNAMIC_TYPE;
+				} else if(strstr(buff, "tcp_read_time_out")) {
+					sscanf(buff, "%s %d", user, &tcp_read_time_out);
+				} else if(strstr(buff, "tcp_connect_time_out")) {
+					sscanf(buff, "%s %d", user, &tcp_connect_time_out);
+				} else if(strstr(buff, "remote_dns_subnet")) {
+					sscanf(buff, "%s %d", user, &remote_dns_subnet);
+					if(remote_dns_subnet >= 256) {
+						fprintf(stderr,
+							"remote_dns_subnet: invalid value. requires a number between 0 and 255.\n");
+						exit(1);
+					}
+				} else if(strstr(buff, "localnet")) {
+					if(sscanf(buff, "%s %21[^/]/%15s", user, local_in_addr_port, local_netmask) < 3) {
 						fprintf(stderr, "localnet format error");
 						exit(1);
 					}
 					/* clean previously used buffer */
-					memset(local_in_port, 0,
-						sizeof(local_in_port) / sizeof(local_in_port[0]));
+					memset(local_in_port, 0, sizeof(local_in_port) / sizeof(local_in_port[0]));
 
-					if (sscanf(local_in_addr_port, "%15[^:]:%5s",
-						local_in_addr, local_in_port) < 2) {
-					    PDEBUG("added localnet: netaddr=%s, port=%s\n",
-							local_in_addr, local_netmask);
+					if(sscanf(local_in_addr_port, "%15[^:]:%5s", local_in_addr, local_in_port) < 2) {
+						PDEBUG("added localnet: netaddr=%s, netmask=%s\n",
+						       local_in_addr, local_netmask);
 					} else {
-					    PDEBUG("added localnet: netaddr=%s, port=%s, netmask=%s\n",
-							local_in_addr, local_in_port, local_netmask);
+						PDEBUG("added localnet: netaddr=%s, port=%s, netmask=%s\n",
+						       local_in_addr, local_in_port, local_netmask);
 					}
-					if (num_localnet_addr < MAX_LOCALNET)
-					{
+					if(num_localnet_addr < MAX_LOCALNET) {
 						int error;
-						error = inet_pton(AF_INET, local_in_addr, &localnet_addr[num_localnet_addr].in_addr);
-						if (error <= 0)
-						{
+						error =
+						    inet_pton(AF_INET, local_in_addr,
+							      &localnet_addr[num_localnet_addr].in_addr);
+						if(error <= 0) {
 							fprintf(stderr, "localnet address error\n");
 							exit(1);
 						}
-						error = inet_pton(AF_INET, local_netmask, &localnet_addr[num_localnet_addr].netmask);
-						if (error <= 0)
-						{
+						error =
+						    inet_pton(AF_INET, local_netmask,
+							      &localnet_addr[num_localnet_addr].netmask);
+						if(error <= 0) {
 							fprintf(stderr, "localnet netmask error\n");
 							exit(1);
 						}
-						if (local_in_port[0]) {
-							localnet_addr[num_localnet_addr].port = (short)atoi(local_in_port);
+						if(local_in_port[0]) {
+							localnet_addr[num_localnet_addr].port =
+							    (short) atoi(local_in_port);
 						} else {
 							localnet_addr[num_localnet_addr].port = 0;
 						}
 						++num_localnet_addr;
-					}
-					else
-					{
+					} else {
 						fprintf(stderr, "# of localnet exceed %d.\n", MAX_LOCALNET);
 					}
-				} else if(strstr(buff,"chain_len")){
-					char *pc;int len;
-					pc=strchr(buff,'=');
-					len=atoi(++pc);
-					proxychains_max_chain=(len?len:1);
-				} else if(strstr(buff,"quiet_mode")){
-					proxychains_quiet_mode=1;
-				} else if(strstr(buff,"proxy_dns")){
-					proxychains_resolver=1;
+				} else if(strstr(buff, "chain_len")) {
+					char *pc;
+					int len;
+					pc = strchr(buff, '=');
+					len = atoi(++pc);
+					proxychains_max_chain = (len ? len : 1);
+				} else if(strstr(buff, "quiet_mode")) {
+					proxychains_quiet_mode = 1;
+				} else if(strstr(buff, "proxy_dns")) {
+					proxychains_resolver = 1;
 				}
 			}
 		}
@@ -304,11 +283,10 @@ static inline void get_chain_data(
 	proxychains_got_chain_data = 1;
 }
 
+/*******  HOOK FUNCTIONS  *******/
 
-
-int connect (int sock, const struct sockaddr *addr, unsigned int len)
-{
-	int socktype=0, flags=0, ret=0;
+int connect(int sock, const struct sockaddr *addr, unsigned int len) {
+	int socktype = 0, flags = 0, ret = 0;
 	socklen_t optlen = 0;
 	ip_type dest_ip;
 #ifdef DEBUG
@@ -317,177 +295,145 @@ int connect (int sock, const struct sockaddr *addr, unsigned int len)
 	struct in_addr *p_addr_in;
 	unsigned short port;
 	size_t i;
+	int remote_dns_connect = 0;
 
-	if(!init_l)
-		init_lib();
-	optlen=sizeof(socktype);
-	getsockopt(sock,SOL_SOCKET,SO_TYPE,&socktype,&optlen);
-	if (! (SOCKFAMILY(*addr)==AF_INET  && socktype==SOCK_STREAM))
-		return true_connect(sock,addr,len);
+	INIT();
+	optlen = sizeof(socktype);
+	getsockopt(sock, SOL_SOCKET, SO_TYPE, &socktype, &optlen);
+	if(!(SOCKFAMILY(*addr) == AF_INET && socktype == SOCK_STREAM))
+		return true_connect(sock, addr, len);
 
-	p_addr_in = &((struct sockaddr_in *)addr)->sin_addr;
-	port = ntohs(((struct sockaddr_in *)addr)->sin_port);
+	p_addr_in = &((struct sockaddr_in *) addr)->sin_addr;
+	port = ntohs(((struct sockaddr_in *) addr)->sin_port);
 
 #ifdef DEBUG
-//	PDEBUG("localnet: %s; ", inet_ntop(AF_INET,&in_addr_localnet, str, sizeof(str)));
-//	PDEBUG("netmask: %s; " , inet_ntop(AF_INET, &in_addr_netmask, str, sizeof(str)));
+//      PDEBUG("localnet: %s; ", inet_ntop(AF_INET,&in_addr_localnet, str, sizeof(str)));
+//      PDEBUG("netmask: %s; " , inet_ntop(AF_INET, &in_addr_netmask, str, sizeof(str)));
 	PDEBUG("target: %s\n", inet_ntop(AF_INET, p_addr_in, str, sizeof(str)));
 	PDEBUG("port: %d\n", port);
 #endif
-	for (i = 0; i < num_localnet_addr; i++) {
-		if ((localnet_addr[i].in_addr.s_addr & localnet_addr[i].netmask.s_addr)
-			== (p_addr_in->s_addr & localnet_addr[i].netmask.s_addr))
-		{
-			if (localnet_addr[i].port || localnet_addr[i].port == port) {
+
+	// check if connect called from proxydns
+        remote_dns_connect = (ntohl(p_addr_in->s_addr) >> 24 == remote_dns_subnet);
+
+	for(i = 0; i < num_localnet_addr && !remote_dns_connect; i++) {
+		if((localnet_addr[i].in_addr.s_addr & localnet_addr[i].netmask.s_addr)
+		   == (p_addr_in->s_addr & localnet_addr[i].netmask.s_addr)) {
+			if(!localnet_addr[i].port || localnet_addr[i].port == port) {
 				PDEBUG("accessing localnet using true_connect\n");
-				return true_connect(sock,addr,len);
+				return true_connect(sock, addr, len);
 			}
 		}
 	}
 
 	flags = fcntl(sock, F_GETFL, 0);
 	if(flags & O_NONBLOCK)
-	fcntl(sock, F_SETFL, !O_NONBLOCK);
-	
+		fcntl(sock, F_SETFL, !O_NONBLOCK);
+
 	dest_ip.as_int = SOCKADDR(*addr);
-	
-	ret = connect_proxy_chain(
-		sock,
-		dest_ip,
-		SOCKPORT(*addr),
-		proxychains_pd,
-		proxychains_proxy_count,
-		proxychains_ct,
-		proxychains_max_chain );
-	
+
+	ret = connect_proxy_chain(sock,
+				  dest_ip,
+				  SOCKPORT(*addr),
+				  proxychains_pd, proxychains_proxy_count, proxychains_ct, proxychains_max_chain);
+
 	fcntl(sock, F_SETFL, flags);
 	if(ret != SUCCESS)
-	errno = ECONNREFUSED;
+		errno = ECONNREFUSED;
 	return ret;
 }
 
-struct hostent *gethostbyname(const char *name)
-{
-	if(!init_l)
-		init_lib();
-	
-	PDEBUG("gethostbyname: %s\n",name);
-	
+struct hostent *gethostbyname(const char *name) {
+	INIT();
+
+	PDEBUG("gethostbyname: %s\n", name);
+
 	if(proxychains_resolver)
 		return proxy_gethostbyname(name);
 	else
 		return true_gethostbyname(name);
-			
+
 	return NULL;
 }
 
-int getaddrinfo(const char *node, const char *service,
-		const struct addrinfo *hints,
-		struct addrinfo **res)
-{
+int getaddrinfo(const char *node, const char *service, const struct addrinfo *hints, struct addrinfo **res) {
 	int ret = 0;
-	
-	if(!init_l)
-		init_lib();
-	
-	PDEBUG("getaddrinfo: %s %s\n",node ,service);
-	
+
+	INIT();
+
+	PDEBUG("getaddrinfo: %s %s\n", node, service);
+
 	if(proxychains_resolver)
 		ret = proxy_getaddrinfo(node, service, hints, res);
 	else
 		ret = true_getaddrinfo(node, service, hints, res);
-			
+
 	return ret;
 }
 
-void freeaddrinfo(struct addrinfo *res)
-{
-	if(!init_l)
-		init_lib();
-	
-	PDEBUG("freeaddrinfo %p \n",res);
-	
+void freeaddrinfo(struct addrinfo *res) {
+	INIT();
+
+	PDEBUG("freeaddrinfo %p \n", res);
+
 	if(!proxychains_resolver)
 		true_freeaddrinfo(res);
 	else {
-		free(res->ai_addr);
-		free(res);
+		if (res != NULL) {
+			free(res->ai_addr);
+			free(res);
+		}
 	}
 	return;
 }
+
 // work around a buggy prototype in GLIBC. according to the bugtracker it has been fixed in git at 02 May 2011.
 // 2.14 came out in June 2011 so that should be the first fixed version
 #if defined(__GLIBC__) && (__GLIBC__ < 3) && (__GLIBC_MINOR__ < 14)
-int getnameinfo (const struct sockaddr * sa,
-                        socklen_t salen, char * host,
-                        socklen_t hostlen, char * serv,
-                        socklen_t servlen, unsigned int flags)
+int getnameinfo(const struct sockaddr *sa,
+		socklen_t salen, char *host, socklen_t hostlen, char *serv, socklen_t servlen, unsigned int flags)
 #else
-int getnameinfo (const struct sockaddr * sa,
-			socklen_t salen, char * host,
-			socklen_t hostlen, char * serv,
-			socklen_t servlen, int flags)
+int getnameinfo(const struct sockaddr *sa,
+		socklen_t salen, char *host, socklen_t hostlen, char *serv, socklen_t servlen, int flags)
 #endif
 {
+	char ip_buf[16];
 	int ret = 0;
-	
-	if(!init_l)
-		init_lib();
-	
+
+	INIT();
+
 	PDEBUG("getnameinfo: %s %s\n", host, serv);
-	
+
 	if(!proxychains_resolver) {
-		ret = true_getnameinfo(sa,salen,host,hostlen,
-				serv,servlen,flags);
+		ret = true_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
 	} else {
-		if(hostlen) 
-			strncpy(host, inet_ntoa(SOCKADDR_2(*sa)),hostlen);
-		if(servlen) 
-			snprintf(serv, servlen,"%d",ntohs(SOCKPORT(*sa)));
+		if(hostlen) {
+			inet_ntop(AF_INET, (unsigned char*) &(SOCKADDR_2(*sa)), ip_buf, sizeof(ip_buf));
+			strncpy(host, ip_buf, hostlen);
+		}
+		if(servlen)
+			snprintf(serv, servlen, "%d", ntohs(SOCKPORT(*sa)));
 	}
 	return ret;
 }
 
-// stolen from libulz (C) rofl0r
-static void pc_stringfromipv4(unsigned char* ip_buf_4_bytes, char* outbuf_16_bytes) {
-        unsigned char* p;
-        char *o = outbuf_16_bytes;
-        unsigned char n;
-        for(p = ip_buf_4_bytes; p < ip_buf_4_bytes + 4; p++) {
-                n = *p;
-                if(*p >= 100) {
-                        if(*p >= 200) *(o++) = '2';
-                        else *(o++) = '1';
-                        n %= 100;
-                }
-                if(*p >= 10) {
-                        *(o++) = (n / 10) + '0';
-                        n %= 10;
-                }
-                *(o++) = n + '0';
-                *(o++) = '.';
-        }
-        o[-1] = 0;
-}
-
-struct hostent *gethostbyaddr (const void *addr, socklen_t len, int type)
-{
+struct hostent *gethostbyaddr(const void *addr, socklen_t len, int type) {
 	static char buf[16];
 	static char ipv4[4];
-	static char* list[2];
+	static char *list[2];
 	static struct hostent he;
-	
-	if(!init_l)
-		init_lib();
-	
+
+	INIT();
+
 	PDEBUG("TODO: proper gethostbyaddr hook\n");
-	
+
 	if(!proxychains_resolver)
-		return true_gethostbyaddr(addr,len,type);
+		return true_gethostbyaddr(addr, len, type);
 	else {
-		
+
 		PDEBUG("len %u\n", len);
-		if(len != 4) return NULL;
+		if(len != 4)
+			return NULL;
 		he.h_name = buf;
 		memcpy(ipv4, addr, 4);
 		list[0] = ipv4;
@@ -496,9 +442,8 @@ struct hostent *gethostbyaddr (const void *addr, socklen_t len, int type)
 		he.h_addrtype = AF_INET;
 		he.h_aliases = NULL;
 		he.h_length = 4;
-		pc_stringfromipv4((unsigned char*)addr, buf);
+		inet_ntop(AF_INET, addr, buf, sizeof(buf));
 		return &he;
 	}
 	return NULL;
 }
-	

src/main.c

@@ -18,37 +18,38 @@
 #define _POSIX_C_SOURCE 200809L
 #undef _XOPEN_SOURCE
 #define _XOPEN_SOURCE 700
+
+#include <sys/types.h>
+#include <sys/param.h>
+
+#include <errno.h>
 #include <stdio.h>
-#include <unistd.h>
 #include <stdlib.h>
 #include <string.h>
-#include <errno.h>
-#include <sys/types.h>
-#include <sys/wait.h>
+#include <unistd.h>
 
-extern char *optarg;
-extern int optind, opterr, optopt;
+#include <sys/wait.h>
 
 #include "common.h"
 
-static int usage(char** argv) {
-	printf( "\nUsage:\t%s -q -f config_file program_name [arguments]\n"
-		"\t-q makes proxychains quiet - this overrides the config setting\n"
-		"\t-t allows to manually specify a configfile to use\n"
-		"\tfor example : proxychains telnet somehost.com\n"
-		"More help in README file\n\n", argv[0]);
+static int usage(char **argv) {
+	printf("\nUsage:\t%s -q -f config_file program_name [arguments]\n"
+	       "\t-q makes proxychains quiet - this overrides the config setting\n"
+	       "\t-t allows to manually specify a configfile to use\n"
+	       "\tfor example : proxychains telnet somehost.com\n" "More help in README file\n\n", argv[0]);
 	return EXIT_FAILURE;
 }
 
-int check_path(char* path) {
-	if(!path) return 0;
+int check_path(char *path) {
+	if(!path)
+		return 0;
 	return access(path, R_OK) != -1;
 }
 
-static const char* dll_name = "libproxychains4.so";
+static const char *dll_name = DLL_NAME;
 
 static char own_dir[256];
-static const char* dll_dirs[] = {
+static const char *dll_dirs[] = {
 	".",
 	own_dir,
 	LIB_DIR,
@@ -59,9 +60,10 @@ static const char* dll_dirs[] = {
 	NULL
 };
 
-static void set_own_dir(const char* argv0) {
+static void set_own_dir(const char *argv0) {
 	size_t l = strlen(argv0);
-	while(l && argv0[l - 1] != '/') l--;
+	while(l && argv0[l - 1] != '/')
+		l--;
 	if(l == 0)
 		memcpy(own_dir, ".", 2);
 	else {
@@ -70,76 +72,90 @@ static void set_own_dir(const char* argv0) {
 	}
 }
 
+#define MAX_COMMANDLINE_FLAGS 2
+
 int main(int argc, char *argv[]) {
 	char *path = NULL;
-	char buf[256];
-	char pbuf[256];
-	int opt;
+	char buf[PATH_MAX];
+	char pbuf[PATH_MAX];
 	int start_argv = 1;
 	int quiet = 0;
-	
-	if(argc == 1) return usage(argv);
+	size_t i;
 
-	while ((opt = getopt(argc, argv, "qf:")) != -1) {
-		switch (opt) {
-			case 'q':
+	const char *prefix = NULL;
+
+	for(i = 0; i < MAX_COMMANDLINE_FLAGS; i++) {
+		if(start_argv < argc && argv[start_argv][0] == '-') {
+			if(argv[start_argv][1] == 'q') {
 				quiet = 1;
 				start_argv++;
-				break;
-			case 'f':
-				path = (char *)optarg;
-				if(!path) {
-					fprintf(stderr, "error: no path supplied.\n");
-					return EXIT_FAILURE;
-				}
+			} else if(argv[start_argv][1] == 'f') {
+
+				if(start_argv + 1 < argc)
+					path = argv[start_argv + 1];
+				else
+					return usage(argv);
+
 				start_argv += 2;
-				break;
-			default: /* '?' */
-				return usage(argv);
 			}
+		} else
+			break;
 	}
-	
-	if(start_argv >= argc) return usage(argv);
+
+	if(start_argv >= argc)
+		return usage(argv);
 
 	/* check if path of config file has not been passed via command line */
 	if(!path) {
 		// priority 1: env var PROXYCHAINS_CONF_FILE
 		path = getenv(PROXYCHAINS_CONF_FILE_ENV_VAR);
-		if(check_path(path)) goto have;
-		
+
+		if(check_path(path))
+			goto have;
+
 		// priority 2; proxychains conf in actual dir
 		path = getcwd(buf, sizeof(buf));
 		snprintf(pbuf, sizeof(pbuf), "%s/%s", path, PROXYCHAINS_CONF_FILE);
 		path = pbuf;
-		if(check_path(path)) goto have;
-		
+
+		if(check_path(path))
+			goto have;
+
 		// priority 3; $HOME/.proxychains/proxychains.conf
 		path = getenv("HOME");
 		snprintf(pbuf, sizeof(pbuf), "%s/.proxychains/%s", path, PROXYCHAINS_CONF_FILE);
 		path = pbuf;
-		if(check_path(path)) goto have;
-		
-		// priority 4: /etc/proxychains.conf
-		path = "/etc/proxychains.conf";
-		if(check_path(path)) goto have;
-		perror("couldnt find configuration file");
+		if(check_path(path))
+			goto have;
+
+		/* Check for default config file in two locations {install_prefix}/etc /etc */
+		// priority 4: $INSTALL_PREFIX/etc/proxychains.conf
+		snprintf(pbuf, sizeof(pbuf), "%s/etc/%s", INSTALL_PREFIX, PROXYCHAINS_CONF_FILE);
+		path = pbuf;
+		if(check_path(path))
+			goto have;
+
+		// priority 5: /etc/proxychains.conf
+		snprintf(pbuf, sizeof(pbuf), "/etc/%s", PROXYCHAINS_CONF_FILE);
+		path = pbuf;
+		if(check_path(path))
+			goto have;
+		perror("Couldn't find configuration file");
 		return 1;
 	}
-	
+
 	have:
 
-	if(!quiet) fprintf(stderr, LOG_PREFIX "config file found: %s\n", path);
+	if(!quiet)
+		fprintf(stderr, LOG_PREFIX "config file found: %s\n", path);
 
 	/* Set PROXYCHAINS_CONF_FILE to get proxychains lib to use new config file. */
 	setenv(PROXYCHAINS_CONF_FILE_ENV_VAR, path, 1);
-	
-	if(quiet) setenv(PROXYCHAINS_QUIET_MODE_ENV_VAR, "1", 1);
 
+	if(quiet)
+		setenv(PROXYCHAINS_QUIET_MODE_ENV_VAR, "1", 1);
 
 	// search DLL
-	size_t i = 0;
-	const char* prefix = NULL;
-
 	set_own_dir(argv[0]);
 
 	while(dll_dirs[i]) {
@@ -155,11 +171,18 @@ int main(int argc, char *argv[]) {
 		fprintf(stderr, "couldnt locate %s\n", dll_name);
 		return EXIT_FAILURE;
 	}
-	if(!quiet) fprintf(stderr, LOG_PREFIX "preloading %s/%s\n", prefix, dll_name);
-	
-	snprintf(buf, sizeof(buf), "LD_PRELOAD=%s/%s", prefix, dll_name);
 
-	putenv(buf);
+	if(!quiet)
+		fprintf(stderr, LOG_PREFIX "preloading %s/%s\n", prefix, dll_name);
+
+#ifndef IS_MAC
+	snprintf(buf, sizeof(buf), "%s/%s", prefix, dll_name);
+	setenv("LD_PRELOAD", buf, 1);
+#else
+	snprintf(buf, sizeof(buf), "%s/%s", prefix, dll_name);
+	setenv("DYLD_INSERT_LIBRARIES", buf, 1);
+	setenv("DYLD_FORCE_FLAT_NAMESPACE", "1", 1);
+#endif
 	execvp(argv[start_argv], &argv[start_argv]);
 	perror("proxychains can't load process....");
 

src/proxychains

@@ -1,26 +1,106 @@
 #!/bin/sh
-echo "ProxyChains-3.1 (http://proxychains.sf.net)"
+echo "ProxyChains-4.0 (https://github.com/haad/proxychains)"
 
 usage() {
 
 	echo "	usage:"
-	echo "		$0 [h] [f config-file] <prog> [args]"
+	echo "	$0 [hq] [-f config-file] <prog> [args]"
+	echo "		-q make proxychains quiet"
 	exit
 }
 
+find_proxy_conf() {
+
+	show_proxy_env
+	if [ -f "/usr/local/etc/proxychains.conf" ]; then
+		export PROXYCHAINS_CONF_FILE="/usr/local/etc/proxychains.conf"
+	else 
+		if [ -f "/etc/proxychains.conf" ];then
+			PROXYCHAINS_CONF_FILE="/etc/proxychains.conf"
+		fi
+	fi
+}
+
+#
+# XXX We should not overide possible user settings here. Just add libproxychains to it.
+# 
+setup_proxy_env() {
+
+	if [ -z "$PROXYCHAINS_CONF_FILE" ]; then
+		find_proxy_conf
+	fi
+
+	if [ $(uname -s) = "Darwin" ]; then
+		export DYLD_FORCE_FLAT_NAMESPACE=
+		export DYLD_INSERT_LIBRARIES=libproxychains4.dylib
+	else
+		export LD_PRELOAD=libproxychains.so.4
+	fi
+}
+
+disable_proxy_env() {
+
+	if [ $(uname -s) = "Darwin" ]; then
+		unset DYLD_FORCE_FLAT_NAMESPACE
+		export DYLD_INSERT_LIBRARIES=$(echo $DYLD_INSERT_LIBRARIES | sed -e 's/libproxychains4.dylib//g')
+		if [ -z $DYLD_INSERT_LIBRARIES ]; then
+			unset DYLD_INSERT_LIBRARIES
+		fi
+	else
+		export LD_PRELOAD=$(echo $DYLD_INSERT_LIBRARIES | sed -e 's/libproxychains.so.4//g')
+		if [ -z $LD_PRELOAD ]; then
+			unset LD_PRELOAD
+		fi
+	fi
+}
+
+show_proxy_env() {
+
+	echo "Proxified environment setup"
+	echo "PROXYCHAINS_CONF_FILE = $PROXYCHAINS_CONF_FILE"
+	
+	if [ $(uname -s) = "Darwin" ]; then
+		echo "DYLD_FORCE_FLAT_NAMESPACE = $DYLD_FORCE_FLAT_NAMESPACE"
+		echo "DYLD_INSERT_LIBRARIES = $DYLD_INSERT_LIBRARIES"
+	else
+		echo "LD_PRELOAD = $LD_PRELOAD"
+	fi
+}
+
 if [ $# = 0 ] ; then
 	usage
 fi
 
-if [ $1 = "-h" ]; then
-	usage
-fi
+case "$1" in
+	-h)
+		usage
+		;;
+	-f)
+		export PROXYCHAINS_CONF_FILE=$2;
+		shift;
+		shift;
+		;;
+	-q)
+		export PROXYCHAINS_QUIET_MODE=1;
+		shift;
+		;;
+	show)
+		show_proxy_env
+		return
+		;;
+esac
 
-if [ "$1" = "-f" ]; then
-	export PROXYCHAINS_CONF_FILE=$2;
-	shift;
-	shift;
-fi
-
-export LD_PRELOAD=libproxychains.so.3
-exec "$@"
+case "$1" in
+	on)
+		setup_proxy_env
+		show_proxy_env
+		;;
+	off)
+		disable_proxy_env
+		show_proxy_env
+		;;
+	*)
+		setup_proxy_env
+		exec "$@"
+		;;
+esac

src/proxychains.conf

@@ -1,4 +1,4 @@
-# proxychains.conf  VER 3.1
+# proxychains.conf  VER 4
 #
 #        HTTP, SOCKS4, SOCKS5 tunneling proxifier with DNS.
 #	
@@ -37,10 +37,32 @@ strict_chain
 # Proxy DNS requests - no leak for DNS data
 proxy_dns 
 
+# set the class A subnet number to usefor use of the internal remote DNS mapping
+# we use the reserved 224.x.x.x range by default,
+# if the proxified app does a DNS request, we will return an IP from that range.
+# on further accesses to this ip we will send the saved DNS name to the proxy.
+# in case some control-freak app checks the returned ip, and denies to 
+# connect, you can use another subnet, e.g. 10.x.x.x or 127.x.x.x.
+# of course you should make sure that the proxified app does not need
+# *real* access to this subnet. 
+# i.e. dont use the same subnet then in the localnet section
+#remote_dns_subnet 127 
+#remote_dns_subnet 10
+remote_dns_subnet 224
+
 # Some timeouts in milliseconds
 tcp_read_time_out 15000
 tcp_connect_time_out 8000
 
+# By default enable localnet for loopback address ranges
+# RFC5735 Loopback address range
+localnet 127.0.0.0/255.0.0.0
+# RFC1918 Private Address Ranges
+# localnet 10.0.0.0/255.0.0.0
+# localnet 172.16.0.0/255.240.0.0
+# localnet 192.168.0.0/255.255.0.0
+
+
 # Example for localnet exclusion
 ## Exclude connections to 192.168.1.0/24 with port 80
 # localnet 192.168.1.0:80/255.255.255.0