release 4.14

conditions that need to be met are:
1) chaintype strict
2) proxy_dns on
3) not the first proxy in the list

if these conditions are met, the dns name can be passed to be
receiving proxy and be resolved there.

addressing https://github.com/rofl0r/proxychains-ng/issues/246#issuecomment-468222637

Makefile

@@ -30,6 +30,7 @@ INC     =
 PIC     = -fPIC
 AR      = $(CROSS_COMPILE)ar
 RANLIB  = $(CROSS_COMPILE)ranlib
+SOCKET_LIBS =
 
 LDSO_SUFFIX = so
 LD_SET_SONAME = -Wl,-soname=
@@ -82,7 +83,7 @@ src/version.o: src/version.h
 
 $(LDSO_PATHNAME): $(LOBJS)
 	$(CC) $(LDFLAGS) $(LD_SET_SONAME)$(LDSO_PATHNAME) $(USER_LDFLAGS) \
-		-shared -o $@ $(LOBJS)
+		-shared -o $@ $(LOBJS) $(SOCKET_LIBS)
 
 $(ALL_TOOLS): $(OBJS)
 	$(CC) src/main.o src/common.o $(USER_LDFLAGS) -o $(PXCHAINS)

README

@@ -1,4 +1,4 @@
-ProxyChains-NG ver 4.12 README
+ProxyChains-NG ver 4.14 README
 =============================
 
   ProxyChains is a UNIX program, that hooks network-related libc functions
@@ -52,6 +52,20 @@ ProxyChains-NG ver 4.12 README
 
 Changelog:
 ----------
+Version 4.14
+- allow alternative proto://user:pass@ip:port syntax for proxylist
+- fix endless loop in round robin mode when all proxies are down (#147)
+- fix compilation on android (#265)
+- fix fd leak in forked processes (#273)
+- skip connection attempt to nullrouted ips
+- allow hostnames for proxylist under specific circumstances
+
+Version 4.13
+- fix robustness of DNS lookup thread and a segfault
+- fix socks5 user/pass auth on non-conforming servers
+- fix memory leak
+- add support for Solaris
+
 Version 4.12
 - fix several build issues
   - for MAC

VERSION

@@ -1 +1 @@
-4.12
+4.14

configure

@@ -14,27 +14,11 @@ done
 set +C
 trap 'rm "$tmpc"' EXIT INT QUIT TERM HUP
 
-ismac() {
-	uname -s | grep Darwin >/dev/null
-}
-
-isx86_64() {
-	uname -m | grep -i X86_64 >/dev/null
-}
-
-isbsd() {
-	uname -s | grep BSD >/dev/null
-}
-
-isopenbsd() {
-	uname -s | grep OpenBSD >/dev/null
-}
-
 check_compile() {
 	printf "checking %s ... " "$1"
 	printf "$3" > "$tmpc"
 	local res=0
-	$CC $OUR_CPPFLAGS $CPPFLAGS $2 $CFLAGS -c "$tmpc" -o /dev/null >/dev/null 2>&1 \
+	$CC $OUR_CPPFLAGS $CPPFLAGS $2 $CFLAGS "$tmpc" -o /dev/null >/dev/null 2>&1 \
 	|| res=1
 	test x$res = x0 && \
 	{ printf "yes\n" ; test x"$2" = x || OUR_CPPFLAGS="$OUR_CPPFLAGS $2" ; } \
@@ -62,6 +46,19 @@ check_compile_run() {
 	return $res
 }
 
+check_link_silent() {
+	printf "$2" > "$tmpc"
+	$CC $OUR_CPPFLAGS $CPPFLAGS $1 $CFLAGS "$tmpc" -o /dev/null >/dev/null 2>&1
+}
+
+check_link() {
+	printf "checking %s ... " "$1"
+	local res=0
+	check_link_silent "$2" "$3" || res=1
+	test x$res = x0 && printf "yes\n" || printf "no\n"
+	return $res
+}
+
 usage() {
 	echo "supported arguments"
 	echo "--prefix=/path            default: $prefix"
@@ -73,7 +70,7 @@ usage() {
 	echo "--ignore-cve              default: no"
 	echo "	if set to yes ignores CVE-2015-3887 and makes it possible"
 	echo "	to preload from current dir (insecure)"
-	ismac && isx86_64 && echo "--fat-binary : build for both i386 and x86_64 architectures on 64-bit Macs"
+	echo "--fat-binary : build for both i386 and x86_64 architectures on 64-bit Macs"
 	echo "--help : show this text"
 	exit 1
 }
@@ -133,20 +130,46 @@ if [ -z "$CC" ] ; then
 	CC=cc
 fi
 
-check_compile 'whether netinet/in.h defines s6_addr16' "" \
+echo > config.mak
-'#include <netinet/in.h>\nint main(int a, char**c){struct in6_addr x={.s6_addr32[0]=a};return x.s6_addr16[0]; }' \
+
-|| {
+bsd_detected=false
-check_compile 'whether netinet/in.h defines __u6_addr.__u6_addr16' \
+isbsd() {
-'-Ds6_addr16=__u6_addr.__u6_addr16 -Ds6_addr32=__u6_addr.__u6_addr32' \
+	$bsd_detected
-'#include <netinet/in.h>\nint main(int a, char**c){struct in6_addr x={.s6_addr32[0]=a};return x.s6_addr16[0]; }'
+}
+mac_detected=false
+ismac() {
+	$mac_detected
+}
+mac_64=false
+ismac64() {
+	$mac_64
+}
+solaris_detected=false
+issolaris() {
+	$solaris_detected
 }
 
-check_define __OpenBSD__ && \
+check_compile 'whether we have GNU-style getservbyname_r()' "-DHAVE_GNU_GETSERVBYNAME_R" \
+'#define _GNU_SOURCE\n#include <netdb.h>\nint main() {\nstruct servent *se = 0;struct servent se_buf;char buf[1024];\ngetservbyname_r("foo", (void*) 0, &se_buf, buf, sizeof(buf), &se);\nreturn 0;}'
+
+check_compile 'whether we have pipe2() and O_CLOEXEC' "-DHAVE_PIPE2" \
+'#define _GNU_SOURCE\n#include <fcntl.h>\n#include <unistd.h>\nint main() {\nint pipefd[2];\npipe2(pipefd, O_CLOEXEC);\nreturn 0;}'
+
+check_define __APPLE__ && {
+	mac_detected=true
+	check_define __x86_64__ && mac_64=true
+}
+check_define __FreeBSD__ && bsd_detected=true
+check_define __OpenBSD__ && {
+bsd_detected=true
+echo "CFLAGS+=-DIS_OPENBSD">>config.mak
 check_compile_run 'whether OpenBSDs fclose() (illegally) calls close()' \
 '#include <stdio.h>\n#include<stdlib.h>\nint close(int x){exit(0);}int main(){fclose(stdin);return 1;}' && \
 OUR_CPPFLAGS="$OUR_CPPFLAGS -DBROKEN_FCLOSE"
+}
+check_define __sun && check_define __SVR4 && solaris_detected=true
 
-echo "CC=$CC">config.mak
+echo "CC=$CC">>config.mak
 [ -z "$CPPFLAGS" ] || echo "CPPFLAGS=$CPPFLAGS">>config.mak
 [ -z "$CFLAGS" ] || echo "USER_CFLAGS=$CFLAGS">>config.mak
 [ -z "$LDFLAGS" ] || echo "USER_LDFLAGS=$LDFLAGS">>config.mak
@@ -158,22 +181,38 @@ echo includedir=$includedir>>config.mak
 echo sysconfdir=$sysconfdir>>config.mak
 [ "$ignore_cve" = "no" ] && echo "CPPFLAGS+= -DSUPER_SECURE">>config.mak
 [ -z "$OUR_CPPFLAGS" ] || echo "CPPFLAGS+= $OUR_CPPFLAGS" >>config.mak
+
+check_link "whether we can use -Wl,--no-as-needed" "-Wl,--no-as-needed" \
+"int main() { return 0; }" || echo NO_AS_NEEDED= >> config.mak
+
+LD_SONAME_FLAG=
+printf "checking what's the option to use in linker to set library name ... "
+for o in --soname -h -soname -install_name; do
+	check_link_silent "-shared -Wl,$o,libconftest.so" "void test_func(int a) {}" && LD_SONAME_FLAG=$o && break
+done
+if [ -z "$LD_SONAME_FLAG" ]; then
+	printf '\ncannot find an option to set library name\n'
+	exit 1
+fi
+echo "$LD_SONAME_FLAG"
+echo "LD_SET_SONAME = -Wl,$LD_SONAME_FLAG," >> config.mak
+
 make_cmd=make
 if ismac ; then
-	echo NO_AS_NEEDED=>>config.mak
 	echo LDSO_SUFFIX=dylib>>config.mak
 	echo MAC_CFLAGS+=-DIS_MAC=1>>config.mak
-	if isx86_64 && [ "$fat_binary" = 1 ] ; then
+	if ismac64 && [ "$fat_binary" = 1 ] ; then
 		echo "Configuring a fat binary for i386 and x86_64"
 		echo MAC_CFLAGS+=-arch i386 -arch x86_64>>config.mak
 		echo LDFLAGS+=-arch i386 -arch x86_64>>config.mak
 	fi
-	echo LD_SET_SONAME=-Wl,-install_name,>>config.mak
 elif isbsd ; then
 	echo LIBDL=>>config.mak
 	echo "CFLAGS+=-DIS_BSD">>config.mak
-	isopenbsd && echo "CFLAGS+=-DIS_OPENBSD">>config.mak
 	make_cmd=gmake
+elif issolaris; then
+	echo "CFLAGS+=-DIS_SOLARIS -D__EXTENSIONS__" >> config.mak
+	echo "SOCKET_LIBS=-lsocket -lnsl" >> config.mak
 fi
 
 echo "Done, now run $make_cmd && $make_cmd install"

src/allocator_thread.c

@@ -1,3 +1,8 @@
+#undef _GNU_SOURCE
+#define _GNU_SOURCE
+#undef _POSIX_C_SOURCE
+#define _DARWIN_C_SOURCE
+#include <limits.h>
 #include <pthread.h>
 #include <unistd.h>
 #include <fcntl.h>
@@ -9,6 +14,7 @@
 #include <stdint.h>
 #include <stddef.h>
 #include <errno.h>
+#include <sys/mman.h>
 #include "allocator_thread.h"
 #include "debug.h"
 #include "ip_type.h"
@@ -34,9 +40,8 @@ static void *dumpstring(char* s, size_t len) {
 	return p;
 }
 
-pthread_mutex_t internal_ips_lock;
+static pthread_mutex_t *internal_ips_lock;
-internal_ip_lookup_table *internal_ips = NULL;
+static internal_ip_lookup_table *internal_ips;
-internal_ip_lookup_table internal_ips_buf;
 
 uint32_t index_from_internal_ip(ip_type4 internalip) {
 	PFUNC();
@@ -111,9 +116,9 @@ static ip_type4 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 = dumpstring((char*) name, len + 1);
-	
+
 	if(!new_mem) {
 		internal_ips->list[internal_ips->counter] = 0;
 		goto oom;
@@ -126,7 +131,7 @@ static ip_type4 ip_from_internal_list(char* name, size_t len) {
 
 	return res;
 	err_plus_unlock:
-	
+
 	PDEBUG("return err\n");
 	return ip_type_invalid.addr.v4;
 }
@@ -151,7 +156,6 @@ struct at_msghdr {
 };
 
 static pthread_t allocator_thread;
-static pthread_attr_t allocator_thread_attr;
 int req_pipefd[2];
 int resp_pipefd[2];
 
@@ -240,7 +244,7 @@ static void* threadfunc(void* x) {
 	(void) x;
 	int ret;
 	struct at_msghdr msg;
-	union { 
+	union {
 		char host[MSG_LEN_MAX];
 		ip_type4 ip;
 	} readbuf;
@@ -276,7 +280,7 @@ static void* threadfunc(void* x) {
 
 ip_type4 at_get_ip_for_host(char* host, size_t len) {
 	ip_type4 readbuf;
-	MUTEX_LOCK(&internal_ips_lock);
+	MUTEX_LOCK(internal_ips_lock);
 	if(len > MSG_LEN_MAX) goto inv;
 	struct at_msghdr msg = {.msgtype = ATM_GETIP, .datalen = len + 1 };
 	if(sendmessage(ATD_SERVER, &msg, host) &&
@@ -285,42 +289,70 @@ ip_type4 at_get_ip_for_host(char* host, size_t len) {
 		inv:
 		readbuf = ip_type_invalid.addr.v4;
 	}
-	MUTEX_UNLOCK(&internal_ips_lock);
+	assert(msg.msgtype == ATM_GETIP);
+	MUTEX_UNLOCK(internal_ips_lock);
 	return readbuf;
 }
 
 size_t at_get_host_for_ip(ip_type4 ip, char* readbuf) {
 	struct at_msghdr msg = {.msgtype = ATM_GETNAME, .datalen = sizeof(ip_type4) };
 	size_t res = 0;
-	MUTEX_LOCK(&internal_ips_lock);
+	MUTEX_LOCK(internal_ips_lock);
 	if(sendmessage(ATD_SERVER, &msg, &ip) && getmessage(ATD_CLIENT, &msg, readbuf)) {
 		if((ptrdiff_t) msg.datalen <= 0) res = 0;
 		else res = msg.datalen - 1;
 	}
-	MUTEX_UNLOCK(&internal_ips_lock);
+	assert(msg.msgtype == ATM_GETNAME);
+	MUTEX_UNLOCK(internal_ips_lock);
 	return res;
 }
 
 
 static void initpipe(int* fds) {
-	if(pipe(fds) == -1) {
+	int retval;
+
+#ifdef HAVE_PIPE2
+	retval = pipe2(fds, O_CLOEXEC);
+#else
+	retval = pipe(fds);
+	if(retval == 0) {
+		fcntl(fds[0], F_SETFD, FD_CLOEXEC);
+		fcntl(fds[1], F_SETFD, FD_CLOEXEC);
+	}
+#endif
+	if(retval == -1) {
 		perror("pipe");
 		exit(1);
 	}
 }
 
+#ifndef MAX
+#define MAX(x, y) ((x) > (y) ? (x) : (y))
+#endif
+
+#if !defined(PTHREAD_STACK_MIN) || defined(__APPLE__)
+/* MAC says its min is 8KB, but then crashes in our face. thx hunkOLard */
+#define PTHREAD_STACK_MIN 64*1024
+#endif
+
 /* initialize with pointers to shared memory. these will
  * be used to place responses and arguments */
 void at_init(void) {
 	PFUNC();
-	MUTEX_INIT(&internal_ips_lock);
+	void *shm = mmap(0, 4096, PROT_WRITE|PROT_READ, MAP_ANON|MAP_SHARED, -1, 0);
-	internal_ips = &internal_ips_buf;
+	assert(shm);
+	internal_ips_lock = shm;
+	internal_ips = (void*)((char*)shm + 2048);
+
+	MUTEX_INIT(internal_ips_lock);
 	memset(internal_ips, 0, sizeof *internal_ips);
 	initpipe(req_pipefd);
 	initpipe(resp_pipefd);
+	pthread_attr_t allocator_thread_attr;
 	pthread_attr_init(&allocator_thread_attr);
-	pthread_attr_setstacksize(&allocator_thread_attr, 16 * 1024);
+	pthread_attr_setstacksize(&allocator_thread_attr, MAX(16 * 1024, PTHREAD_STACK_MIN));
 	pthread_create(&allocator_thread, &allocator_thread_attr, threadfunc, 0);
+	pthread_attr_destroy(&allocator_thread_attr);
 }
 
 void at_close(void) {
@@ -332,6 +364,5 @@ void at_close(void) {
 	close(req_pipefd[1]);
 	close(resp_pipefd[0]);
 	close(resp_pipefd[1]);
-	pthread_attr_destroy(&allocator_thread_attr);
+	MUTEX_DESTROY(internal_ips_lock);
-	MUTEX_DESTROY(&internal_ips_lock);
 }

src/core.c

@@ -38,6 +38,7 @@
 #include "core.h"
 #include "common.h"
 #include "allocator_thread.h"
+#include "mutex.h"
 
 extern int tcp_read_time_out;
 extern int tcp_connect_time_out;
@@ -106,7 +107,7 @@ static void encode_base_64(char *src, char *dest, int max_len) {
 }
 
 void proxychains_write_log(char *str, ...) {
-	char buff[1024*20];
+	char buff[1024*4];
 	va_list arglist;
 	if(!proxychains_quiet_mode) {
 		va_start(arglist, str);
@@ -350,12 +351,15 @@ static int tunnel_to(int sock, ip_type ip, unsigned short port, proxy_type pt, c
 
 				if(2 != read_n_bytes(sock, in, 2))
 					goto err;
-				if(in[0] != 1 || in[1] != 0) {
+	/* according to RFC 1929 the version field for the user/pass auth sub-
-					if(in[0] != 1)
+	   negotiation should be 1, which is kinda counter-intuitive, so there
-						goto err;
+	   are some socks5 proxies that return 5 instead. other programs like
-					else
+	   curl work fine when the version is 5, so let's do the same and accept
-						return BLOCKED;
+	   either of them. */
-				}
+				if(!(in[0] == 5 || in[0] == 1))
+					goto err;
+				if(in[1] != 0)
+					return BLOCKED;
 			}
 			int buff_iter = 0;
 			buff[buff_iter++] = 5;	// version
@@ -564,8 +568,8 @@ int connect_proxy_chain(int sock, ip_type target_ip,
 	unsigned int offset = 0;
 	unsigned int alive_count = 0;
 	unsigned int curr_len = 0;
-	unsigned int curr_pos = 0;
 	unsigned int looped = 0; // went back to start of list in RR mode
+	unsigned int rr_loop_max = 14;
 
 	p3 = &p4;
 
@@ -602,23 +606,27 @@ int connect_proxy_chain(int sock, ip_type target_ip,
 
 		case ROUND_ROBIN_TYPE:
 			alive_count = calc_alive(pd, proxy_count);
-			curr_pos = offset = proxychains_proxy_offset;
+			offset = proxychains_proxy_offset;
 			if(alive_count < max_chain)
 				goto error_more;
-                        PDEBUG("1:rr_offset = %d, curr_pos = %d\n", offset, curr_pos);
+			PDEBUG("1:rr_offset = %d\n", offset);
 			/* Check from current RR offset til end */
 			for (;rc != SUCCESS;) {
 				if (!(p1 = select_proxy(FIFOLY, pd, proxy_count, &offset))) {
 					/* We've reached the end of the list, go to the start */
  					offset = 0;
 					looped++;
-					continue;
+					if (looped > rr_loop_max) {
-				} else if (looped && rc > 0 && offset >= curr_pos) {
+						proxychains_proxy_offset = 0;
- 					PDEBUG("GOTO MORE PROXIES 0\n");
+						goto error_more;
-					/* We've gone back to the start and now past our starting position */
+					} else {
-					proxychains_proxy_offset = 0;
+						PDEBUG("rr_type all proxies down, release all\n");
- 					goto error_more;
+						release_all(pd, proxy_count);
- 				}
+						/* Each loop we wait 10ms more */
+						usleep(10000 * looped);
+						continue;
+					}
+				}
  				PDEBUG("2:rr_offset = %d\n", offset);
  				rc=start_chain(&ns, p1, RRT);
 			}
@@ -721,10 +729,13 @@ int connect_proxy_chain(int sock, ip_type target_ip,
 	return -1;
 }
 
+static pthread_mutex_t servbyname_lock;
 void core_initialize(void) {
+	MUTEX_INIT(&servbyname_lock);
 }
 
 void core_unload(void) {
+	MUTEX_DESTROY(&servbyname_lock);
 }
 
 static void gethostbyname_data_setstring(struct gethostbyname_data* data, char* name) {
@@ -787,18 +798,17 @@ void proxy_freeaddrinfo(struct addrinfo *res) {
 	free(res);
 }
 
-#if defined(IS_MAC) || defined(IS_OPENBSD)
+static int mygetservbyname_r(const char* name, const char* proto, struct servent* result_buf,
-#ifdef IS_OPENBSD /* OpenBSD has its own incompatible getservbyname_r */
-#define getservbyname_r mygetservbyname_r
-#endif
-/* getservbyname on mac is using thread local storage, so we dont need mutex 
-   TODO: check if the same applies to OpenBSD */
-static int getservbyname_r(const char* name, const char* proto, struct servent* result_buf, 
 			   char* buf, size_t buflen, struct servent** result) {
 	PFUNC();
+#ifdef HAVE_GNU_GETSERVBYNAME_R
+	PDEBUG("using host getservbyname_r\n");
+	return getservbyname_r(name, proto, result_buf, buf, buflen, result);
+#endif
 	struct servent *res;
 	int ret;
 	(void) buf; (void) buflen;
+	MUTEX_LOCK(&servbyname_lock);
 	res = getservbyname(name, proto);
 	if(res) {
 		*result_buf = *res;
@@ -808,9 +818,9 @@ static int getservbyname_r(const char* name, const char* proto, struct servent*
 		*result = NULL;
 		ret = ENOENT;
 	}
+	MUTEX_UNLOCK(&servbyname_lock);
 	return ret;
 }
-#endif
 
 int proxy_getaddrinfo(const char *node, const char *service, const struct addrinfo *hints, struct addrinfo **res) {
 	struct gethostbyname_data ghdata;
@@ -830,7 +840,10 @@ int proxy_getaddrinfo(const char *node, const char *service, const struct addrin
 	if(node && !inet_aton(node, &((struct sockaddr_in *) &space->sockaddr_space)->sin_addr)) {
 		/* some folks (nmap) use getaddrinfo() with AI_NUMERICHOST to check whether a string
 		   containing a numeric ip was passed. we must return failure in that case. */
-		if(hints && (hints->ai_flags & AI_NUMERICHOST)) return EAI_NONAME;
+		if(hints && (hints->ai_flags & AI_NUMERICHOST)) {
+			free(space);
+			return EAI_NONAME;
+		}
 		hp = proxy_gethostbyname(node, &ghdata);
 		if(hp)
 			memcpy(&((struct sockaddr_in *) &space->sockaddr_space)->sin_addr,
@@ -838,7 +851,7 @@ int proxy_getaddrinfo(const char *node, const char *service, const struct addrin
 		else
 			goto err2;
 	}
-	if(service) getservbyname_r(service, NULL, &se_buf, buf, sizeof(buf), &se);
+	if(service) mygetservbyname_r(service, NULL, &se_buf, buf, sizeof(buf), &se);
 
 	port = se ? se->s_port : htons(atoi(service ? service : "0"));
 	((struct sockaddr_in *) &space->sockaddr_space)->sin_port = port;

src/libproxychains.c

@@ -45,6 +45,12 @@
 #define     SOCKFAMILY(x)     (satosin(x)->sin_family)
 #define     MAX_CHAIN 512
 
+#ifdef IS_SOLARIS
+#undef connect
+int __xnet_connect(int sock, const struct sockaddr *addr, unsigned int len);
+connect_t true___xnet_connect;
+#endif
+
 close_t true_close;
 connect_t true_connect;
 gethostbyname_t true_gethostbyname;
@@ -72,7 +78,7 @@ pthread_once_t init_once = PTHREAD_ONCE_INIT;
 
 static int init_l = 0;
 
-static inline void get_chain_data(proxy_data * pd, unsigned int *proxy_count, chain_type * ct);
+static void get_chain_data(proxy_data * pd, unsigned int *proxy_count, chain_type * ct);
 
 static void* load_sym(char* symname, void* proxyfunc) {
 
@@ -108,6 +114,9 @@ static void setup_hooks(void) {
 	SETUP_SYM(gethostbyaddr);
 	SETUP_SYM(getnameinfo);
 	SETUP_SYM(close);
+#ifdef IS_SOLARIS
+	SETUP_SYM(__xnet_connect);
+#endif
 }
 
 static int close_fds[16];
@@ -151,6 +160,107 @@ static void gcc_init(void) {
 }
 #endif
 
+
+typedef enum {
+	RS_PT_NONE = 0,
+	RS_PT_SOCKS4,
+	RS_PT_SOCKS5,
+	RS_PT_HTTP
+} rs_proxyType;
+
+/*
+  proxy_from_string() taken from rocksock network I/O library (C) rofl0r
+  valid inputs:
+	socks5://user:password@proxy.domain.com:port
+	socks5://proxy.domain.com:port
+	socks4://proxy.domain.com:port
+	http://user:password@proxy.domain.com:port
+	http://proxy.domain.com:port
+
+	supplying port number is obligatory.
+	user:pass@ part is optional for http and socks5.
+	however, user:pass authentication is currently not implemented for http proxies.
+  return 1 on success, 0 on error.
+*/
+static int proxy_from_string(const char *proxystring,
+	char *type_buf,
+	char* host_buf,
+	int *port_n,
+	char *user_buf,
+	char* pass_buf)
+{
+	const char* p;
+	rs_proxyType proxytype;
+
+	size_t next_token = 6, ul = 0, pl = 0, hl;
+	if(!proxystring[0] || !proxystring[1] || !proxystring[2] || !proxystring[3] || !proxystring[4] || !proxystring[5]) goto inv_string;
+	if(*proxystring == 's') {
+		switch(proxystring[5]) {
+			case '5': proxytype = RS_PT_SOCKS5; break;
+			case '4': proxytype = RS_PT_SOCKS4; break;
+			default: goto inv_string;
+		}
+	} else if(*proxystring == 'h') {
+		proxytype = RS_PT_HTTP;
+		next_token = 4;
+	} else goto inv_string;
+	if(
+	   proxystring[next_token++] != ':' ||
+	   proxystring[next_token++] != '/' ||
+	   proxystring[next_token++] != '/') goto inv_string;
+	const char *at = strchr(proxystring+next_token, '@');
+	if(at) {
+		if(proxytype == RS_PT_SOCKS4)
+			return 0;
+		p = strchr(proxystring+next_token, ':');
+		if(!p || p >= at) goto inv_string;
+		const char *u = proxystring+next_token;
+		ul = p-u;
+		p++;
+		pl = at-p;
+		if(proxytype == RS_PT_SOCKS5 && (ul > 255 || pl > 255))
+			return 0;
+		memcpy(user_buf, u, ul);
+		user_buf[ul]=0;
+		memcpy(pass_buf, p, pl);
+		pass_buf[pl]=0;
+		next_token += 2+ul+pl;
+	} else {
+		user_buf[0]=0;
+		pass_buf[0]=0;
+	}
+	const char* h = proxystring+next_token;
+	p = strchr(h, ':');
+	if(!p) goto inv_string;
+	hl = p-h;
+	if(hl > 255)
+		return 0;
+	memcpy(host_buf, h, hl);
+	host_buf[hl]=0;
+	*port_n = atoi(p+1);
+	switch(proxytype) {
+		case RS_PT_SOCKS4:
+			strcpy(type_buf, "socks4");
+			break;
+		case RS_PT_SOCKS5:
+			strcpy(type_buf, "socks5");
+			break;
+		case RS_PT_HTTP:
+			strcpy(type_buf, "http");
+			break;
+		default:
+			return 0;
+	}
+	return 1;
+inv_string:
+	return 0;
+}
+
+static const char* bool_str(int bool_val) {
+	if(bool_val) return "true";
+	return "false";
+}
+
 /* 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;
@@ -193,9 +303,11 @@ static void get_chain_data(proxy_data * pd, unsigned int *proxy_count, chain_typ
 
 				int ret = sscanf(buff, "%s %s %d %s %s", type, host, &port_n, pd[count].user, pd[count].pass);
 				if(ret < 3 || ret == EOF) {
-					inv:
+					if(!proxy_from_string(buff, type, host, &port_n, pd[count].user, pd[count].pass)) {
-					fprintf(stderr, "error: invalid item in proxylist section: %s", buff);
+						inv:
-					exit(1);
+						fprintf(stderr, "error: invalid item in proxylist section: %s", buff);
+						exit(1);
+					}
 				}
 
 				memset(&pd[count].ip, 0, sizeof(pd[count].ip));
@@ -203,8 +315,20 @@ static void get_chain_data(proxy_data * pd, unsigned int *proxy_count, chain_typ
 				pd[count].port = htons((unsigned short) port_n);
 				ip_type* host_ip = &pd[count].ip;
 				if(1 != inet_pton(host_ip->is_v6 ? AF_INET6 : AF_INET, host, host_ip->addr.v6)) {
-					fprintf(stderr, "proxy %s has invalid value or is not numeric\n", host);
+					if(*ct == STRICT_TYPE && proxychains_resolver && count > 0) {
-					exit(1);
+						/* we can allow dns hostnames for all but the first proxy in the list if chaintype is strict, as remote lookup can be done */
+						ip_type4 internal_ip = at_get_ip_for_host(host, strlen(host));
+						pd[count].ip.is_v6 = 0;
+						host_ip->addr.v4 = internal_ip;
+						if(internal_ip.as_int == ip_type_invalid.addr.v4.as_int)
+							goto inv_host;
+					} else {
+inv_host:
+						fprintf(stderr, "proxy %s has invalid value or is not numeric\n", host);
+						fprintf(stderr, "non-numeric ips are only allowed under the following circumstances:\n");
+						fprintf(stderr, "chaintype == strict (%s), proxy is not first in list (%s), proxy_dns active (%s)\n\n", bool_str(*ct == STRICT_TYPE), bool_str(count > 0), bool_str(proxychains_resolver));
+						exit(1);
+					}
 				}
 
 				if(!strcmp(type, "http")) {
@@ -308,6 +432,7 @@ static void get_chain_data(proxy_data * pd, unsigned int *proxy_count, chain_typ
 	}
 	*proxy_count = count;
 	proxychains_got_chain_data = 1;
+	PDEBUG("proxy_dns: %s\n", proxychains_resolver ? "ON" : "OFF");
 }
 
 /*******  HOOK FUNCTIONS  *******/
@@ -329,8 +454,7 @@ int close(int fd) {
 	return -1;
 }
 static int is_v4inv6(const struct in6_addr *a) {
-	return a->s6_addr32[0] == 0 && a->s6_addr32[1] == 0 &&
+	return !memcmp(a->s6_addr, "\0\0\0\0\0\0\0\0\0\0\xff\xff", 12);
-	       a->s6_addr16[4] == 0 && a->s6_addr16[5] == 0xffff;
 }
 int connect(int sock, const struct sockaddr *addr, unsigned int len) {
 	INIT();
@@ -360,10 +484,14 @@ int connect(int sock, const struct sockaddr *addr, unsigned int len) {
 	           : ntohs(((struct sockaddr_in6 *) addr)->sin6_port);
 	struct in_addr v4inv6;
 	if(v6 && is_v4inv6(p_addr_in6)) {
-		memcpy(&v4inv6.s_addr, &p_addr_in6->s6_addr32[3], 4);
+		memcpy(&v4inv6.s_addr, &p_addr_in6->s6_addr[12], 4);
 		v6 = dest_ip.is_v6 = 0;
 		p_addr_in = &v4inv6;
 	}
+	if(!v6 && !memcmp(p_addr_in, "\0\0\0\0", 4)) {
+		errno = ECONNREFUSED;
+		return -1;
+	}
 
 //      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)));
@@ -400,6 +528,12 @@ int connect(int sock, const struct sockaddr *addr, unsigned int len) {
 	return ret;
 }
 
+#ifdef IS_SOLARIS
+int __xnet_connect(int sock, const struct sockaddr *addr, unsigned int len) {
+	return connect(sock, addr, len);
+}
+#endif
+
 static struct gethostbyname_data ghbndata;
 struct hostent *gethostbyname(const char *name) {
 	INIT();
@@ -455,7 +589,7 @@ int pc_getnameinfo(const struct sockaddr *sa, socklen_t salen,
 			unsigned scopeid = 0;
 			if(v6) {
 				if(is_v4inv6(&((struct sockaddr_in6*)sa)->sin6_addr)) {
-					memcpy(v4inv6buf, &((struct sockaddr_in6*)sa)->sin6_addr.s6_addr32[3], 4);
+					memcpy(v4inv6buf, &((struct sockaddr_in6*)sa)->sin6_addr.s6_addr[12], 4);
 					ip = v4inv6buf;
 					v6 = 0;
 				} else

src/main.c

@@ -8,9 +8,9 @@
  ***************************************************************************/
 
 #undef _POSIX_C_SOURCE
-#define _POSIX_C_SOURCE 200809L
+#define _POSIX_C_SOURCE 200112L
 #undef _XOPEN_SOURCE
-#define _XOPEN_SOURCE 700
+#define _XOPEN_SOURCE 600
 #include <stdio.h>
 #include <unistd.h>
 #include <stdlib.h>
@@ -72,6 +72,9 @@ int main(int argc, char *argv[]) {
 	size_t i;
 	const char *prefix = NULL;
 
+	if(argc == 2 && !strcmp(argv[1], "--help"))
+		return usage(argv);
+
 	for(i = 0; i < MAX_COMMANDLINE_FLAGS; i++) {
 		if(start_argv < argc && argv[start_argv][0] == '-') {
 			if(argv[start_argv][1] == 'q') {

tests/test_getaddrinfo.c

@@ -3,30 +3,30 @@
 #include <netdb.h>
 #include <netinet/in.h>
 #include <sys/socket.h>
- 
+
 #ifndef   NI_MAXHOST
 #define   NI_MAXHOST 1025
 #endif
- 
+
-int main(void) {
+static int doit(const char* host, const char* service) {
 	struct addrinfo *result;
 	struct addrinfo *res;
 	int error;
-	
+
 	/* resolve the domain name into a list of addresses */
-	error = getaddrinfo("www.example.com", NULL, NULL, &result);
+	error = getaddrinfo(host, service, NULL, &result);
 	if (error != 0)
-	{   
+	{
 		fprintf(stderr, "error in getaddrinfo: %s\n", gai_strerror(error));
 		return EXIT_FAILURE;
-	}   
+	}
-	
+
 	/* loop over all returned results and do inverse lookup */
 	for (res = result; res != NULL; res = res->ai_next)
-	{   
+	{
 		char hostname[NI_MAXHOST] = "";
-	
+
-		error = getnameinfo(res->ai_addr, res->ai_addrlen, hostname, NI_MAXHOST, NULL, 0, 0); 
+		error = getnameinfo(res->ai_addr, res->ai_addrlen, hostname, NI_MAXHOST, NULL, 0, 0);
 		if (error != 0)
 		{
 		fprintf(stderr, "error in getnameinfo: %s\n", gai_strerror(error));
@@ -34,8 +34,15 @@ int main(void) {
 		}
 		if (*hostname != '\0')
 		printf("hostname: %s\n", hostname);
-	}   
+	}
-	
+
 	freeaddrinfo(result);
 	return EXIT_SUCCESS;
 }
+
+int main(void) {
+	int ret;
+	ret = doit("www.example.com", NULL);
+	ret = doit("www.example.com", "80");
+	return ret;
+}