preliminary support for new DYLD hooking method for OSX Monterey

there's currently no build system support yet. after ./configure
was executed, add -DMONTEREY_HOOKING to CFLAGS/CPPFLAGS in config.mak
to activate this.

addressing #409

Makefile

@@ -19,7 +19,7 @@ DOBJS = src/daemon/hsearch.o \
         src/daemon/sblist.o src/daemon/sblist_delete.o \
         src/daemon/daemon.o src/daemon/udpserver.o
 
-LOBJS = src/nameinfo.o src/version.o \
+LOBJS = src/version.o \
         src/core.o src/common.o src/libproxychains.o \
         src/allocator_thread.o src/rdns.o \
         src/hostsreader.o src/hash.o src/debug.o
@@ -30,7 +30,7 @@ GENH = src/version.h
 CFLAGS  += -Wall -O0 -g -std=c99 -D_GNU_SOURCE -pipe
 NO_AS_NEEDED = -Wl,--no-as-needed
 LIBDL   = -ldl
-LDFLAGS = -fPIC $(NO_AS_NEEDED) $(LIBDL) -lpthread
+LDFLAGS = -fPIC $(NO_AS_NEEDED) $(LIBDL) $(PTHREAD)
 INC     = 
 PIC     = -fPIC
 AR      = $(CROSS_COMPILE)ar

README

@@ -1,4 +1,4 @@
-ProxyChains-NG ver 4.14 README
+ProxyChains-NG ver 4.15 README
 =============================
 
   ProxyChains is a UNIX program, that hooks network-related libc functions
@@ -52,6 +52,18 @@ ProxyChains-NG ver 4.14 README
 
 Changelog:
 ----------
+Version 4.15
+- fix configure script for buggy binutils version
+- initialize rand_seed with nano-second granularity
+- add support for numeric ipv6 in getaddrinfo
+- fix bug in getaddrinfo when node is null and !passive
+- add dnat feature
+- add raw proxy type
+- add haiku support
+- add proxy_dns_old to emulate proxychains 3.1 behaviour
+- add new proxy_dns_daemon feature (experimental)
+- various other fixes
+
 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)
@@ -236,7 +248,7 @@ Known Problems:
 
 Community:
 ----------
-#proxychains on irc.freenode.net
+#proxychains on irc.libera.chat
 
 Donations:
 ----------

VERSION

@@ -1 +1 @@
-4.14
+4.15

configure

@@ -19,11 +19,12 @@ check_compile() {
 	printf "checking %s ... " "$1"
 	printf "$3" > "$tmpc"
 	local res=0
-	$CC $OUR_CPPFLAGS $CPPFLAGS $2 $CFLAGS "$tmpc" -o /dev/null >/dev/null 2>&1 \
+	$CC $OUR_CPPFLAGS $CPPFLAGS $2 $CFLAGS "$tmpc" -o "$tmpc".out >/dev/null 2>&1 \
 	|| res=1
 	test x$res = x0 && \
 	{ printf "yes\n" ; test x"$2" = x || OUR_CPPFLAGS="$OUR_CPPFLAGS $2" ; } \
 	|| printf "no\n"
+	rm -f "$tmpc".out
 	return $res
 }
 
@@ -49,7 +50,10 @@ check_compile_run() {
 
 check_link_silent() {
 	printf "$2" > "$tmpc"
-	$CC $OUR_CPPFLAGS $CPPFLAGS $1 $CFLAGS "$tmpc" -o /dev/null >/dev/null 2>&1
+	local res=0
+	$CC $OUR_CPPFLAGS $CPPFLAGS $1 $CFLAGS "$tmpc" -o "$tmpc".out  >/dev/null 2>&1 || res=1
+	rm -f "$tmpc".out
+	return $res
 }
 
 check_link() {
@@ -165,6 +169,9 @@ check_compile 'whether we have pipe2() and O_CLOEXEC' "-DHAVE_PIPE2" \
 check_compile 'whether we have SOCK_CLOEXEC' "-DHAVE_SOCK_CLOEXEC" \
 '#define _GNU_SOURCE\n#include <sys/socket.h>\nint main() {\nreturn socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC, 0);}'
 
+check_compile 'whether we have clock_gettime' "-DHAVE_CLOCK_GETTIME" \
+'#define _GNU_SOURCE\n#include <time.h>\nint main() {\nstruct timespec now;clock_gettime(CLOCK_REALTIME, &now);\nreturn now.tv_sec ^ now.tv_nsec;}'
+
 check_define __APPLE__ && {
 	mac_detected=true
 	check_define __x86_64__ && mac_64=true
@@ -208,6 +215,15 @@ fi
 echo "$LD_SONAME_FLAG"
 echo "LD_SET_SONAME = -Wl,$LD_SONAME_FLAG," >> config.mak
 
+if check_link "checking whether we can use -lpthread" "-lpthread" \
+"int main(){return 0;}" ; then
+echo "PTHREAD = -lpthread" >> config.mak
+else
+check_link "checking whether we can use -pthread" "-pthread" \
+"int main(){return 0;}" || fail "no pthread support detected"
+echo "PTHREAD = -pthread" >> config.mak
+fi
+
 make_cmd=make
 if ismac ; then
 	echo LDSO_SUFFIX=dylib>>config.mak

src/core.c

@@ -475,8 +475,7 @@ static proxy_data *select_proxy(select_type how, proxy_data * pd, unsigned int p
 		case RANDOMLY:
 			do {
 				k++;
-				i = rand() % (proxy_count-proxychains_fixed_chain);
+				i = rand() % proxy_count;
-				i += proxychains_fixed_chain;
 			} while(pd[i].ps != PLAY_STATE && k < proxy_count * 100);
 			break;
 		case FIFOLY:
@@ -564,38 +563,9 @@ static int chain_step(int ns, proxy_data * pfrom, proxy_data * pto) {
 	return retcode;
 }
 
-static int strict_connect(
-	unsigned *alive_count,
-	unsigned *offset,
-	int *ns,
-	proxy_data **p1, proxy_data **p2,
-	unsigned proxy_count, proxy_data * pd)
-{
-	*alive_count = calc_alive(pd, proxy_count);
-	*offset = 0;
-	if(!(*p1 = select_proxy(FIFOLY, pd, proxy_count, offset))) {
-		PDEBUG("select_proxy failed\n");
-		return 0;
-	}
-	if(SUCCESS != start_chain(ns, *p1, ST)) {
-		PDEBUG("start_chain failed\n");
-		return 0;
-	}
-	while(*offset < proxy_count) {
-		if(!(*p2 = select_proxy(FIFOLY, pd, proxy_count, offset)))
-			break;
-		if(SUCCESS != chain_step(*ns, *p1, *p2)) {
-			PDEBUG("chain_step failed\n");
-			return 0;
-		}
-		*p1 = *p2;
-	}
-	return 1;
-}
-
 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 proxy_count, chain_type ct, unsigned int max_chain) {
 	proxy_data p4;
 	proxy_data *p1, *p2, *p3;
 	int ns = -1;
@@ -605,7 +575,6 @@ int connect_proxy_chain(int sock, ip_type target_ip,
 	unsigned int curr_len = 0;
 	unsigned int looped = 0; // went back to start of list in RR mode
 	unsigned int rr_loop_max = 14;
-	unsigned int max_chain = proxychains_max_chain;
 
 	p3 = &p4;
 
@@ -614,14 +583,9 @@ int connect_proxy_chain(int sock, ip_type target_ip,
 	again:
 	rc = -1;
 	DUMP_PROXY_CHAIN(pd, proxy_count);
-	if(proxychains_fixed_chain) {
-		if(!strict_connect(&alive_count, &offset, &ns, &p1, &p2, proxychains_fixed_chain, pd))
-			goto error_strict;
-	}
 
 	switch (ct) {
 		case DYNAMIC_TYPE:
-			if(proxychains_fixed_chain) goto dyn_fixed_resume;
 			alive_count = calc_alive(pd, proxy_count);
 			offset = 0;
 			do {
@@ -637,7 +601,6 @@ int connect_proxy_chain(int sock, ip_type target_ip,
 					goto again;
 				}
 				p1 = p2;
-		dyn_fixed_resume:;
 			}
 			//proxychains_write_log(TP);
 			p3->ip = target_ip;
@@ -647,7 +610,6 @@ int connect_proxy_chain(int sock, ip_type target_ip,
 			break;
 
 		case ROUND_ROBIN_TYPE:
-			// FIXME: add support for fixed_len
 			alive_count = calc_alive(pd, proxy_count);
 			offset = proxychains_proxy_offset;
 			if(alive_count < max_chain)
@@ -698,8 +660,25 @@ int connect_proxy_chain(int sock, ip_type target_ip,
 			break;
 
 		case STRICT_TYPE:
-			if(!strict_connect(&alive_count, &offset, &ns, &p1, &p2, proxy_count, pd))
+			alive_count = calc_alive(pd, proxy_count);
+			offset = 0;
+			if(!(p1 = select_proxy(FIFOLY, pd, proxy_count, &offset))) {
+				PDEBUG("select_proxy failed\n");
 				goto error_strict;
+			}
+			if(SUCCESS != start_chain(&ns, p1, ST)) {
+				PDEBUG("start_chain failed\n");
+				goto error_strict;
+			}
+			while(offset < proxy_count) {
+				if(!(p2 = select_proxy(FIFOLY, pd, proxy_count, &offset)))
+					break;
+				if(SUCCESS != chain_step(ns, p1, p2)) {
+					PDEBUG("chain_step failed\n");
+					goto error_strict;
+				}
+				p1 = p2;
+			}
 			//proxychains_write_log(TP);
 			p3->ip = target_ip;
 			p3->port = target_port;
@@ -708,12 +687,6 @@ int connect_proxy_chain(int sock, ip_type target_ip,
 			break;
 
 		case RANDOM_TYPE:
-			if(proxychains_fixed_chain) {
-				if(alive_count < max_chain)
-					goto error_more;
-				curr_len = proxychains_fixed_chain - 1;
-				goto random_fixed_resume;
-			}
 			alive_count = calc_alive(pd, proxy_count);
 			if(alive_count < max_chain)
 				goto error_more;
@@ -722,9 +695,6 @@ int connect_proxy_chain(int sock, ip_type target_ip,
 				if(!(p1 = select_proxy(RANDOMLY, pd, proxy_count, &offset)))
 					goto error_more;
 			} while(SUCCESS != start_chain(&ns, p1, RT) && offset < max_chain);
-
-		random_fixed_resume:;
-
 			while(++curr_len < max_chain) {
 				if(!(p2 = select_proxy(RANDOMLY, pd, proxy_count, &offset)))
 					goto error_more;

src/core.h

@@ -84,7 +84,8 @@ typedef struct {
 } proxy_data;
 
 int connect_proxy_chain (int sock, ip_type target_ip, unsigned short target_port,
-			 proxy_data * pd, unsigned int proxy_count, chain_type ct );
+			 proxy_data * pd, unsigned int proxy_count, chain_type ct,
+			 unsigned int max_chain );
 
 void proxychains_write_log(char *str, ...);
 
@@ -129,9 +130,6 @@ void proxy_freeaddrinfo(struct addrinfo *res);
 void core_initialize(void);
 void core_unload(void);
 
-extern unsigned int proxychains_max_chain;
-extern unsigned int proxychains_fixed_chain;
-
 #include "debug.h"
 
 #endif

src/libproxychains.c

@@ -71,7 +71,6 @@ unsigned int proxychains_proxy_count = 0;
 unsigned int proxychains_proxy_offset = 0;
 int proxychains_got_chain_data = 0;
 unsigned int proxychains_max_chain = 1;
-unsigned int proxychains_fixed_chain = 0;
 int proxychains_quiet_mode = 0;
 enum dns_lookup_flavor proxychains_resolver = DNSLF_LIBC;
 localaddr_arg localnet_addr[MAX_LOCALNET];
@@ -105,31 +104,28 @@ static void* load_sym(char* symname, void* proxyfunc) {
 
 #define INIT() init_lib_wrapper(__FUNCTION__)
 
-#define SETUP_SYM(X) do { if (! true_ ## X ) true_ ## X = load_sym( # X, X ); } while(0)
 
 #include "allocator_thread.h"
 
 const char *proxychains_get_version(void);
 
-static void setup_hooks(void) {
+static void setup_hooks(void);
-	SETUP_SYM(connect);
-	SETUP_SYM(sendto);
-	SETUP_SYM(gethostbyname);
-	SETUP_SYM(getaddrinfo);
-	SETUP_SYM(freeaddrinfo);
-	SETUP_SYM(gethostbyaddr);
-	SETUP_SYM(getnameinfo);
-#ifdef IS_SOLARIS
-	SETUP_SYM(__xnet_connect);
-#endif
-	SETUP_SYM(close);
-}
 
 static int close_fds[16];
 static int close_fds_cnt = 0;
 
+static unsigned get_rand_seed(void) {
+#ifdef HAVE_CLOCK_GETTIME
+	struct timespec now;
+	clock_gettime(CLOCK_REALTIME, &now);
+	return now.tv_sec ^ now.tv_nsec;
+#else
+	return time(NULL);
+#endif
+}
+
 static void do_init(void) {
-	srand(time(NULL));
+	srand(get_rand_seed());
 	core_initialize();
 
 	/* read the config file */
@@ -439,16 +435,6 @@ inv_host:
 					}
 					len = atoi(++pc);
 					proxychains_max_chain = (len ? len : 1);
-				} else if(STR_STARTSWITH(buff, "fixed_len")) {
-					char *pc;
-					int len;
-					pc = strchr(buff, '=');
-					if(!pc) {
-						fprintf(stderr, "error: missing equals sign '=' in fixed_len directive.\n");
-						exit(1);
-					}
-					len = atoi(++pc);
-					proxychains_fixed_chain = (len ? len : 1);
 				} else if(!strcmp(buff, "quiet_mode")) {
 					proxychains_quiet_mode = 1;
 				} else if(!strcmp(buff, "proxy_dns_old")) {
@@ -531,14 +517,6 @@ inv_host:
 		fprintf(stderr, "error: no valid proxy found in config\n");
 		exit(1);
 	}
-	if(proxychains_max_chain <= proxychains_fixed_chain) {
-		fprintf(stderr, "error: fixed_len needs to be smaller than chain_len\n");
-		exit(1);
-	}
-	if(proxychains_fixed_chain > count) {
-		fprintf(stderr, "error: fixed_len > proxycount\n");
-		exit(1);
-	}
 	*proxy_count = count;
 	proxychains_got_chain_data = 1;
 	PDEBUG("proxy_dns: %s\n", rdns_resolver_string(proxychains_resolver));
@@ -546,7 +524,14 @@ inv_host:
 
 /*******  HOOK FUNCTIONS  *******/
 
-int close(int fd) {
+#define EXPAND( args...) args
+#ifdef MONTEREY_HOOKING
+#define HOOKFUNC(R, N, args...) R pxcng_ ## N ( EXPAND(args) )
+#else
+#define HOOKFUNC(R, N, args...) R N ( EXPAND(args) )
+#endif
+
+HOOKFUNC(int, close, int fd) {
 	if(!init_l) {
 		if(close_fds_cnt>=(sizeof close_fds/sizeof close_fds[0])) goto err;
 		close_fds[close_fds_cnt++] = fd;
@@ -567,7 +552,8 @@ int close(int fd) {
 static int is_v4inv6(const struct in6_addr *a) {
 	return !memcmp(a->s6_addr, "\0\0\0\0\0\0\0\0\0\0\xff\xff", 12);
 }
-int connect(int sock, const struct sockaddr *addr, unsigned int len) {
+
+HOOKFUNC(int, connect, int sock, const struct sockaddr *addr, unsigned int len) {
 	INIT();
 	PFUNC();
 
@@ -649,7 +635,7 @@ int connect(int sock, const struct sockaddr *addr, unsigned int len) {
 	ret = connect_proxy_chain(sock,
 				  dest_ip,
 				  htons(port),
-				  proxychains_pd, proxychains_proxy_count, proxychains_ct);
+				  proxychains_pd, proxychains_proxy_count, proxychains_ct, proxychains_max_chain);
 
 	fcntl(sock, F_SETFL, flags);
 	if(ret != SUCCESS)
@@ -658,13 +644,13 @@ int connect(int sock, const struct sockaddr *addr, unsigned int len) {
 }
 
 #ifdef IS_SOLARIS
-int __xnet_connect(int sock, const struct sockaddr *addr, unsigned int len) {
+HOOKFUNC(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) {
+HOOKFUNC(struct hostent*, gethostbyname, const char *name) {
 	INIT();
 	PDEBUG("gethostbyname: %s\n", name);
 
@@ -678,7 +664,7 @@ struct hostent *gethostbyname(const char *name) {
 	return NULL;
 }
 
-int getaddrinfo(const char *node, const char *service, const struct addrinfo *hints, struct addrinfo **res) {
+HOOKFUNC(int, getaddrinfo, const char *node, const char *service, const struct addrinfo *hints, struct addrinfo **res) {
 	INIT();
 	PDEBUG("getaddrinfo: %s %s\n", node ? node : "null", service ? service : "null");
 
@@ -688,7 +674,7 @@ int getaddrinfo(const char *node, const char *service, const struct addrinfo *hi
 		return true_getaddrinfo(node, service, hints, res);
 }
 
-void freeaddrinfo(struct addrinfo *res) {
+HOOKFUNC(void, freeaddrinfo, struct addrinfo *res) {
 	INIT();
 	PDEBUG("freeaddrinfo %p \n", (void *) res);
 
@@ -698,7 +684,7 @@ void freeaddrinfo(struct addrinfo *res) {
 		proxy_freeaddrinfo(res);
 }
 
-int pc_getnameinfo(const struct sockaddr *sa, socklen_t salen,
+HOOKFUNC(int, getnameinfo, const struct sockaddr *sa, socklen_t salen,
 	           char *host, socklen_t hostlen, char *serv,
 	           socklen_t servlen, int flags)
 {
@@ -742,7 +728,7 @@ int pc_getnameinfo(const struct sockaddr *sa, socklen_t salen,
 	return 0;
 }
 
-struct hostent *gethostbyaddr(const void *addr, socklen_t len, int type) {
+HOOKFUNC(struct hostent*, gethostbyaddr, const void *addr, socklen_t len, int type) {
 	INIT();
 	PDEBUG("TODO: proper gethostbyaddr hook\n");
 
@@ -778,7 +764,7 @@ struct hostent *gethostbyaddr(const void *addr, socklen_t len, int type) {
 #   define MSG_FASTOPEN 0x20000000
 #endif
 
-ssize_t sendto(int sockfd, const void *buf, size_t len, int flags,
+HOOKFUNC(ssize_t, sendto, int sockfd, const void *buf, size_t len, int flags,
 	       const struct sockaddr *dest_addr, socklen_t addrlen) {
 	INIT();
 	PFUNC();
@@ -792,3 +778,41 @@ ssize_t sendto(int sockfd, const void *buf, size_t len, int flags,
 	}
 	return true_sendto(sockfd, buf, len, flags, dest_addr, addrlen);
 }
+
+#ifdef MONTEREY_HOOKING
+#define SETUP_SYM(X) do { if (! true_ ## X ) true_ ## X = &X; } while(0)
+#else
+#define SETUP_SYM(X) do { if (! true_ ## X ) true_ ## X = load_sym( # X, X ); } while(0)
+#endif
+
+static void setup_hooks(void) {
+	SETUP_SYM(connect);
+	SETUP_SYM(sendto);
+	SETUP_SYM(gethostbyname);
+	SETUP_SYM(getaddrinfo);
+	SETUP_SYM(freeaddrinfo);
+	SETUP_SYM(gethostbyaddr);
+	SETUP_SYM(getnameinfo);
+#ifdef IS_SOLARIS
+	SETUP_SYM(__xnet_connect);
+#endif
+	SETUP_SYM(close);
+}
+
+#ifdef MONTEREY_HOOKING
+
+#define DYLD_INTERPOSE(_replacement,_replacee) \
+   __attribute__((used)) static struct{ const void* replacement; const void* replacee; } _interpose_##_replacee \
+   __attribute__((section ("__DATA,__interpose"))) = { (const void*)(unsigned long)&_replacement, (const void*)(unsigned long)&_replacee };
+#define DYLD_HOOK(F) DYLD_INTERPOSE(pxcng_ ## F, F)
+
+DYLD_HOOK(connect);
+DYLD_HOOK(sendto);
+DYLD_HOOK(gethostbyname);
+DYLD_HOOK(getaddrinfo);
+DYLD_HOOK(freeaddrinfo);
+DYLD_HOOK(gethostbyaddr);
+DYLD_HOOK(getnameinfo);
+DYLD_HOOK(close);
+
+#endif

src/nameinfo.c

@@ -1,13 +0,0 @@
-#include <sys/socket.h>
-
-extern int pc_getnameinfo(const void *sa, socklen_t salen, 
-                   char *host, socklen_t hostlen, char *serv, 
-                   socklen_t servlen, int flags);
-
-
-int getnameinfo(const void *sa, socklen_t salen, 
-                   char *host, socklen_t hostlen, char *serv, 
-                   socklen_t servlen, int flags) {
-	return pc_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
-}
-

src/proxychains.conf

@@ -45,12 +45,6 @@ strict_chain
 # Make sense only if random_chain or round_robin_chain
 #chain_len = 2
 
-# use this if you want to use e.g. random_chain but always have
-# e.g. tor as first proxy. in that case only chain_len - fixed_len proxies
-# will be used for random chain.
-# currently only implemented for dynamic_chain and random_chain.
-#fixed_len = 1
-
 # Quiet mode (no output from library)
 #quiet_mode
 

tests/test_getaddrinfo.c

@@ -3,6 +3,8 @@
 #include <netdb.h>
 #include <netinet/in.h>
 #include <sys/socket.h>
+#include <assert.h>
+#include <string.h>
 
 #ifndef   NI_MAXHOST
 #define   NI_MAXHOST 1025
@@ -43,9 +45,42 @@ static int doit(const char* host, const char* service) {
 	return EXIT_SUCCESS;
 }
 
+/* reproduce use of getaddrinfo as used by nmap 7.91's canonicalize_address */
+int canonicalize_address(struct sockaddr_storage *ss, struct sockaddr_storage *output) {
+	char canonical_ip_string[NI_MAXHOST];
+	struct addrinfo *ai;
+	int rc;
+	/* Convert address to string. */
+	rc = getnameinfo((struct sockaddr *) ss, sizeof(*ss),
+		canonical_ip_string, sizeof(canonical_ip_string), NULL, 0, NI_NUMERICHOST);
+	assert(rc == 0);
+	struct addrinfo hints = {
+		.ai_family = ss->ss_family,
+		.ai_socktype = SOCK_DGRAM,
+		.ai_flags = AI_NUMERICHOST,
+	};
+	rc = getaddrinfo(canonical_ip_string, NULL, &hints, &ai);
+	if (rc != 0 || ai == NULL)
+		return -1;
+	assert(ai->ai_addrlen > 0 && ai->ai_addrlen <= (int) sizeof(*output));
+	memcpy(output, ai->ai_addr, ai->ai_addrlen);
+	freeaddrinfo(ai);
+	return 0;
+}
+
 int main(void) {
 	int ret;
 	ret = doit("www.example.com", NULL);
 	ret = doit("www.example.com", "80");
+	struct sockaddr_storage o, ss = {.ss_family = PF_INET};
+	struct sockaddr_in *v4 = &ss;
+	struct sockaddr_in6 *v6 = &ss;
+	memcpy(&v4->sin_addr, "\x7f\0\0\1", 4);
+	ret = canonicalize_address(&ss, &o);
+	assert (ret == 0);
+	ss.ss_family = PF_INET6;
+	memcpy(&v6->sin6_addr, "\0\0\0\0" "\0\0\0\0" "\0\0\0\0""\0\0\0\1", 16);
+	ret = canonicalize_address(&ss, &o);
+	assert (ret == 0);
 	return ret;
 }

tests/test_getnameinfo.c

@@ -123,5 +123,17 @@ int main() {
 
 	ASSERT(ret == 0);
 
+	b.sin6_port = 0;
+	b.sin6_scope_id = 0;
+	memcpy(&b.sin6_addr,"\0\0\0\0" "\0\0\0\0" "\0\0\0\0" "\0\0\0\1", 16);
+
+	if ((ret = getnameinfo((void*)sb, sizeof b, hbuf, sizeof(hbuf), NULL,
+	    0, NI_NUMERICHOST)) == 0)
+		printf("host=%s\n", hbuf);
+	else
+		printf("%s\n", gai_strerror(ret));
+
+	ASSERT(ret == 0);
+
 	return 0;
 }