release 4.17

in case of an error condition, both start_chain() and chain_step()
were closing the fd to be acted upon, without setting it to -1,
and the function calling them would close them again.

this could affect multi-threaded applications that opened new fds
between the first and the second close, invalidating those fds
in the targeted app.

patch loosely based on report and PR by @jhfrontz.

closes #542

.gitignore

@@ -1,4 +1,5 @@
 proxychains4
+proxychains4-daemon
 *.bz2
 *.xz
 *.o

Makefile

@@ -11,7 +11,8 @@ bindir = $(exec_prefix)/bin
 prefix = /usr/local/
 includedir = $(prefix)/include
 libdir = $(prefix)/lib
-sysconfdir=$(prefix)/etc
+sysconfdir = $(prefix)/etc
+zshcompletiondir = $(prefix)/share/zsh/site-functions
 
 OBJS = src/common.o src/main.o
 
@@ -19,7 +20,7 @@ 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
@@ -29,8 +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) $(PTHREAD)
-LDFLAGS = -fPIC $(NO_AS_NEEDED) $(LIBDL) -lpthread
 INC     = 
 PIC     = -fPIC
 AR      = $(CROSS_COMPILE)ar
@@ -49,6 +49,7 @@ PXCHAINS = proxychains4
 PXCHAINS_D = proxychains4-daemon
 ALL_TOOLS = $(PXCHAINS) $(PXCHAINS_D)
 ALL_CONFIGS = src/proxychains.conf
+ZSH_COMPLETION = completions/zsh/_proxychains4
 
 -include config.mak
 
@@ -69,9 +70,13 @@ $(DESTDIR)$(libdir)/%: %
 $(DESTDIR)$(sysconfdir)/%: src/%
 	$(INSTALL) -D -m 644 $< $@
 
+$(DESTDIR)$(zshcompletiondir)/%: completions/zsh/%
+	$(INSTALL) -D -m 644 $< $@
+
 install-libs: $(ALL_LIBS:%=$(DESTDIR)$(libdir)/%)
 install-tools: $(ALL_TOOLS:%=$(DESTDIR)$(bindir)/%)
 install-config: $(ALL_CONFIGS:src/%=$(DESTDIR)$(sysconfdir)/%)
+install-zsh-completion: $(ZSH_COMPLETION:completions/zsh/%=$(DESTDIR)$(zshcompletiondir)/%)
 
 clean:
 	rm -f $(ALL_LIBS)
@@ -88,14 +93,14 @@ src/version.o: src/version.h
 	$(CC) $(CPPFLAGS) $(CFLAGS) $(CFLAGS_MAIN) $(INC) $(PIC) -c -o $@ $<
 
 $(LDSO_PATHNAME): $(LOBJS)
-	$(CC) $(LDFLAGS) $(LD_SET_SONAME)$(LDSO_PATHNAME) $(USER_LDFLAGS) \
+	$(CC) $(LDFLAGS) $(FAT_LDFLAGS) $(LD_SET_SONAME)$(LDSO_PATHNAME) \
-		-shared -o $@ $^ $(SOCKET_LIBS)
+		$(USER_LDFLAGS) -shared -o $@ $^ $(SOCKET_LIBS)
 
 $(PXCHAINS): $(OBJS)
-	$(CC) $^ $(USER_LDFLAGS) $(LIBDL) -o $@
+	$(CC) $^ $(FAT_BIN_LDFLAGS) $(USER_LDFLAGS) $(LIBDL) -o $@
 
 $(PXCHAINS_D): $(DOBJS)
-	$(CC) $^ $(USER_LDFLAGS) -o $@
+	$(CC) $^ $(FAT_BIN_LDFLAGS) $(USER_LDFLAGS) -o $@
 
 
-.PHONY: all clean install install-config install-libs install-tools
+.PHONY: all clean install install-config install-libs install-tools install-zsh-completion

README

@@ -1,4 +1,4 @@
-ProxyChains-NG ver 4.14 README
+ProxyChains-NG ver 4.17 README
 =============================
 
   ProxyChains is a UNIX program, that hooks network-related libc functions
@@ -52,6 +52,36 @@ ProxyChains-NG ver 4.14 README
 
 Changelog:
 ----------
+Version 4.17
+- add hook for close_range function, fixing newer versions of openssh
+- fat-binary-m1 option for mac
+- fix DNS error handling in proxy_dns_old
+- simplify init code
+- fix openbsd preloading
+- fix double-close in multithreaded apps
+- various improvements to configure script
+
+Version 4.16
+- fix regression in configure script linker flag detection
+- remove 10 year old workaround for wrong glibc getnameinfo signature
+- support for new DYLD hooking method for OSX Monterey
+- netbsd compilation fix
+- support IPv6 localnets
+- more user-friendly error message when execvp fails
+- proxy_getaddrinfo(): fill in ai_socktype if requested
+
+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 +266,7 @@ Known Problems:
 
 Community:
 ----------
-#proxychains on irc.freenode.net
+#proxychains on irc.libera.chat
 
 Donations:
 ----------

VERSION

@@ -1 +1 @@
-4.14
+4.17

completions/zsh/_proxychains4

@@ -0,0 +1,8 @@
+#compdef proxychains4
+
+_arguments \
+  '(- : *)--help[More help in README file]' \
+  '-q[makes proxychains quiet - this overrides the config setting]' \
+  '-f[allows one to manually specify a configfile to use]: :_files' \
+  '(-)1: :{_command_names -e}' \
+  '*:: :_normal'

configure

@@ -19,18 +19,29 @@ 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
 }
 
+get_define() {
+	$CC $OUR_CPPFLAGS $CPPFLAGS $CFLAGS -dM -E - </dev/null | grep "$1"
+}
+
+get_define_stripped() {
+	local output=$(get_define "$1")
+	test "$?" = 0 || return 1
+	printf "%s\n" "$output" | sed 's/^.* .* //'
+}
+
 check_define() {
 	printf "checking whether \$CC defines %s ... " "$1"
 	local res=1
-	$CC $OUR_CPPFLAGS $CPPFLAGS $CFLAGS -dM -E - </dev/null | grep "$1" >/dev/null && res=0
+	get_define "$1" >/dev/null && res=0
 	test x$res = x0 && printf "yes\n" || printf "no\n"
 	return $res
 }
@@ -49,7 +60,10 @@ 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() {
@@ -70,8 +84,11 @@ usage() {
 	echo "--sysconfdir=/path        default: $prefix/etc"
 	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)"
+	echo "	to preload from current dir (possibly insecure, but handy)"
 	echo "--fat-binary : build for both i386 and x86_64 architectures on 64-bit Macs"
+	echo "--fat-binary-m1 : build for both arm64e and x86_64 architectures on M1 Macs"
+	echo "--hookmethod=dlsym|dyld   hook method for osx. default: auto"
+	echo "  if OSX >= 12 is detected, dyld method will be used if auto."
 	echo "--help : show this text"
 	exit 1
 }
@@ -84,7 +101,10 @@ spliteq() {
 }
 
 fat_binary=
+fat_binary_m1=
 ignore_cve=no
+hookmethod=auto
+
 parsearg() {
 	case "$1" in
 	--prefix=*) prefix=`spliteq $1`;;
@@ -95,7 +115,9 @@ parsearg() {
 	--sysconfdir=*) sysconfdir=`spliteq $1`;;
 	--ignore-cve) ignore_cve=1;;
 	--ignore-cve=*) ignore_cve=`spliteq $1`;;
+	--hookmethod=*) hookmethod=`spliteq $1`;;
 	--fat-binary) fat_binary=1;;
+	--fat-binary-m1) fat_binary_m1=1;;
 	--help) usage;;
 	esac
 }
@@ -151,10 +173,28 @@ issolaris() {
 }
 haiku_detected=false
 ishaiku() {
-	$haiku_detected	
+	$haiku_detected
 }
 
 check_compile 'whether C compiler works' '' 'int main() {return 0;}' || fail 'error: install a C compiler and library'
+check_compile 'whether libc headers are complete' '' '#include <netdb.h>\nint main() {return 0;}' || fail 'error: necessary libc headers are not installed'
+check_compile 'whether C compiler understands -Wno-unknown-pragmas' '-Wno-unknown-pragmas' 'int main() {return 0;}'
+
+if ! check_compile 'whether getnameinfo() servlen argument is POSIX compliant (socklen_t)' "-DGN_NODELEN_T=socklen_t -DGN_SERVLEN_T=socklen_t -DGN_FLAGS_T=int" \
+'#define _GNU_SOURCE\n#include <netdb.h>\nint getnameinfo(const struct sockaddr *, socklen_t, char *, socklen_t, char *, socklen_t, int);int main() {\nreturn 0;}' ; then
+ # GLIBC < 2.14
+ if ! check_compile 'whether getnameinfo() flags argument is unsigned' "-DGN_NODELEN_T=socklen_t -DGN_SERVLEN_T=socklen_t -DGN_FLAGS_T=unsigned" \
+  '#define _GNU_SOURCE\n#include <netdb.h>\nint getnameinfo(const struct sockaddr *, socklen_t, char *, socklen_t, char *, socklen_t, unsigned);int main() {\nreturn 0;}' ; then
+  if ! check_compile 'whether getnameinfo() servlen argument is size_t' "-DGN_NODELEN_T=socklen_t -DGN_SERVLEN_T=size_t -DGN_FLAGS_T=int" \
+   '#define _GNU_SOURCE\n#include <netdb.h>\nint getnameinfo(const struct sockaddr *, socklen_t, char *, socklen_t, char *, size_t, int);int main() {\nreturn 0;}' ; then
+   # OpenBSD & FreeBSD
+   if ! check_compile 'whether getnameinfo() servlen and nodelen argument is size_t' "-DGN_NODELEN_T=size_t -DGN_SERVLEN_T=size_t -DGN_FLAGS_T=int" \
+    '#define _GNU_SOURCE\n#include <netdb.h>\nint getnameinfo(const struct sockaddr *, socklen_t, char *, size_t, char *, size_t, int);int main() {\nreturn 0;}' ; then
+     fail "failed to detect getnameinfo signature"
+   fi
+  fi
+ fi
+fi
 
 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;}'
@@ -165,9 +205,16 @@ 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
+	if test "$hookmethod" = auto ; then
+		osver=$(get_define_stripped __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ 2>/dev/null)
+		test "$osver" -gt $((120000 - 1)) && hookmethod=dyld
+	fi
 }
 check_define __FreeBSD__ && bsd_detected=true
 check_define __OpenBSD__ && {
@@ -208,14 +255,39 @@ fi
 echo "$LD_SONAME_FLAG"
 echo "LD_SET_SONAME = -Wl,$LD_SONAME_FLAG," >> config.mak
 
+if check_link "checking whether we can use -ldl" "-ldl" \
+"int main(){return 0;}" ; then
+echo "LIBDL = -ldl" >> config.mak
+fi
+
+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
 	echo MAC_CFLAGS+=-DIS_MAC=1>>config.mak
+	if test "$hookmethod" = dyld ; then
+		echo "using Monterey style DYLD hooking"
+		echo "CFLAGS+=-DMONTEREY_HOOKING">>config.mak
+	fi
 	if ismac64 && [ "$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 "MAC_CFLAGS+=-arch i386 -arch x86_64">>config.mak
-		echo LDFLAGS+=-arch i386 -arch x86_64>>config.mak
+		echo "FAT_LDFLAGS=-arch i386 -arch x86_64">>config.mak
+		echo "FAT_BIN_LDFLAGS=-arch i386 -arch x86_64">>config.mak
+	fi
+	if [ "$fat_binary_m1" = 1 ] ; then
+		echo "Configuring a fat binary for arm64[e] and x86_64"
+		echo "MAC_CFLAGS+=-arch arm64 -arch arm64e -arch x86_64">>config.mak
+		echo "FAT_LDFLAGS=-arch arm64 -arch arm64e -arch x86_64">>config.mak
+		echo "FAT_BIN_LDFLAGS=-arch arm64 -arch x86_64">>config.mak
 	fi
 elif isbsd ; then
 	echo LIBDL=>>config.mak

src/core.c

@@ -462,8 +462,10 @@ static int start_chain(int *fd, proxy_data * pd, char *begin_mark) {
 	error1:
 	proxychains_write_log(TP " timeout\n");
 	error:
-	if(*fd != -1)
+	if(*fd != -1) {
 		close(*fd);
+		*fd = -1;
+	}
 	return SOCKET_ERROR;
 }
 
@@ -520,9 +522,9 @@ static unsigned int calc_alive(proxy_data * pd, unsigned int proxy_count) {
 }
 
 
-static int chain_step(int ns, proxy_data * pfrom, proxy_data * pto) {
+static int chain_step(int *ns, proxy_data * pfrom, proxy_data * pto) {
 	int retcode = -1;
-	char *hostname;
+	char *hostname, *errmsg = 0;
 	char hostname_buf[MSG_LEN_MAX];
 	char ip_buf[INET6_ADDRSTRLEN];
 	int v6 = pto->ip.is_v6;
@@ -536,31 +538,34 @@ static int chain_step(int ns, proxy_data * pfrom, proxy_data * pto) {
 	usenumericip:
 		if(!inet_ntop(v6?AF_INET6:AF_INET,pto->ip.addr.v6,ip_buf,sizeof ip_buf)) {
 			pto->ps = DOWN_STATE;
-			proxychains_write_log("<--ip conversion error!\n");
+			errmsg = "<--ip conversion error!\n";
-			close(ns);
+			retcode = SOCKET_ERROR;
-			return SOCKET_ERROR;
+			goto err;
 		}
 		hostname = ip_buf;
 	}
 
 	proxychains_write_log(TP " %s:%d ", hostname, htons(pto->port));
-	retcode = tunnel_to(ns, pto->ip, pto->port, pfrom->pt, pfrom->user, pfrom->pass);
+	retcode = tunnel_to(*ns, pto->ip, pto->port, pfrom->pt, pfrom->user, pfrom->pass);
 	switch (retcode) {
 		case SUCCESS:
 			pto->ps = BUSY_STATE;
 			break;
 		case BLOCKED:
 			pto->ps = BLOCKED_STATE;
-			proxychains_write_log("<--denied\n");
+			errmsg = "<--denied\n";
-			close(ns);
+			goto err;
-			break;
 		case SOCKET_ERROR:
 			pto->ps = DOWN_STATE;
-			proxychains_write_log("<--socket error or timeout!\n");
+			errmsg = "<--socket error or timeout!\n";
-			close(ns);
+			goto err;
-			break;
 	}
 	return retcode;
+err:
+	if(errmsg) proxychains_write_log(errmsg);
+	if(*ns != -1) close(*ns);
+	*ns = -1;
+	return retcode;
 }
 
 int connect_proxy_chain(int sock, ip_type target_ip,
@@ -596,7 +601,7 @@ int connect_proxy_chain(int sock, ip_type target_ip,
 				p2 = select_proxy(FIFOLY, pd, proxy_count, &offset);
 				if(!p2)
 					break;
-				if(SUCCESS != chain_step(ns, p1, p2)) {
+				if(SUCCESS != chain_step(&ns, p1, p2)) {
 					PDEBUG("GOTO AGAIN 1\n");
 					goto again;
 				}
@@ -605,7 +610,7 @@ int connect_proxy_chain(int sock, ip_type target_ip,
 			//proxychains_write_log(TP);
 			p3->ip = target_ip;
 			p3->port = target_port;
-			if(SUCCESS != chain_step(ns, p1, p3))
+			if(SUCCESS != chain_step(&ns, p1, p3))
 				goto error;
 			break;
 
@@ -643,7 +648,7 @@ int connect_proxy_chain(int sock, ip_type target_ip,
 					/* Try from the beginning to where we started */
 					offset = 0;
 					continue;
-				} else if(SUCCESS != chain_step(ns, p1, p2)) {
+				} else if(SUCCESS != chain_step(&ns, p1, p2)) {
 					PDEBUG("GOTO AGAIN 1\n");
 					goto again;
 				} else
@@ -655,7 +660,7 @@ int connect_proxy_chain(int sock, ip_type target_ip,
 			p3->port = target_port;
 			proxychains_proxy_offset = offset+1;
 			PDEBUG("pd_offset = %d, curr_len = %d\n", proxychains_proxy_offset, curr_len);
-			if(SUCCESS != chain_step(ns, p1, p3))
+			if(SUCCESS != chain_step(&ns, p1, p3))
 				goto error;
 			break;
 
@@ -673,7 +678,7 @@ int connect_proxy_chain(int sock, ip_type target_ip,
 			while(offset < proxy_count) {
 				if(!(p2 = select_proxy(FIFOLY, pd, proxy_count, &offset)))
 					break;
-				if(SUCCESS != chain_step(ns, p1, p2)) {
+				if(SUCCESS != chain_step(&ns, p1, p2)) {
 					PDEBUG("chain_step failed\n");
 					goto error_strict;
 				}
@@ -682,7 +687,7 @@ int connect_proxy_chain(int sock, ip_type target_ip,
 			//proxychains_write_log(TP);
 			p3->ip = target_ip;
 			p3->port = target_port;
-			if(SUCCESS != chain_step(ns, p1, p3))
+			if(SUCCESS != chain_step(&ns, p1, p3))
 				goto error;
 			break;
 
@@ -698,7 +703,7 @@ int connect_proxy_chain(int sock, ip_type target_ip,
 			while(++curr_len < max_chain) {
 				if(!(p2 = select_proxy(RANDOMLY, pd, proxy_count, &offset)))
 					goto error_more;
-				if(SUCCESS != chain_step(ns, p1, p2)) {
+				if(SUCCESS != chain_step(&ns, p1, p2)) {
 					PDEBUG("GOTO AGAIN 2\n");
 					goto again;
 				}
@@ -707,7 +712,7 @@ int connect_proxy_chain(int sock, ip_type target_ip,
 			//proxychains_write_log(TP);
 			p3->ip = target_ip;
 			p3->port = target_port;
-			if(SUCCESS != chain_step(ns, p1, p3))
+			if(SUCCESS != chain_step(&ns, p1, p3))
 				goto error;
 
 	}
@@ -824,7 +829,8 @@ struct hostent* proxy_gethostbyname_old(const char *name)
 			close(pipe_fd[0]);
 got_buff:
 			l = strlen(buff);
-			if(l && buff[l-1] == '\n') buff[l-1] = 0;
+			if (!l) goto err_dns;
+			if (buff[l-1] == '\n') buff[l-1] = 0;
 			addr = inet_addr(buff);
 			if (addr == (in_addr_t) (-1))
 				goto err_dns;
@@ -839,8 +845,7 @@ got_buff:
 			name, inet_ntoa(*(struct in_addr*)&addr));
 	return &hostent_space;
 err_dns:
-	proxychains_write_log("|DNS-response|: %s does not exist\n", name);
+	proxychains_write_log("|DNS-response|: %s lookup error\n", name);
-	perror("err_dns");
 err:
 	return NULL;
 }
@@ -969,12 +974,13 @@ int proxy_getaddrinfo(const char *node, const char *service, const struct addrin
 		node?node:"",service?service:"",hints?(int)hints->ai_flags:0);
 
 	space = calloc(1, sizeof(struct addrinfo_data));
-	if(!space) goto err1;
+	if(!space) return EAI_MEMORY;
 
 	if(node && !my_inet_aton(node, space)) {
 		/* 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)) {
+err_nn:
 			free(space);
 			return EAI_NONAME;
 		}
@@ -987,7 +993,7 @@ int proxy_getaddrinfo(const char *node, const char *service, const struct addrin
 			memcpy(&((struct sockaddr_in *) &space->sockaddr_space)->sin_addr,
 			       *(hp->h_addr_list), sizeof(in_addr_t));
 		else
-			goto err2;
+			goto err_nn;
 	} else if(node) {
 		af = ((struct sockaddr_in *) &space->sockaddr_space)->sin_family;
 	} else if(!node && !(hints->ai_flags & AI_PASSIVE)) {
@@ -1018,18 +1024,13 @@ int proxy_getaddrinfo(const char *node, const char *service, const struct addrin
 		p->ai_socktype = hints->ai_socktype;
 		p->ai_flags = hints->ai_flags;
 		p->ai_protocol = hints->ai_protocol;
+		if(!p->ai_socktype && p->ai_protocol == IPPROTO_TCP)
+			p->ai_socktype = SOCK_STREAM;
 	} else {
 #ifndef AI_V4MAPPED
 #define AI_V4MAPPED 0
 #endif
 		p->ai_flags = (AI_V4MAPPED | AI_ADDRCONFIG);
 	}
-
-	goto out;
-	err2:
-	free(space);
-	err1:
-	return 1;
-	out:
 	return 0;
 }

src/core.h

@@ -65,8 +65,18 @@ typedef enum {
 } select_type;
 
 typedef struct {
-	struct in_addr in_addr, netmask;
+	sa_family_t family;
 	unsigned short port;
+	union {
+		struct {
+			struct in_addr in_addr;
+			struct in_addr in_mask;
+		};
+		struct {
+			struct in6_addr in6_addr;
+			unsigned char in6_prefix;
+		};
+	};
 } localaddr_arg;
 
 typedef struct {
@@ -90,6 +100,7 @@ int connect_proxy_chain (int sock, ip_type target_ip, unsigned short target_port
 void proxychains_write_log(char *str, ...);
 
 typedef int (*close_t)(int);
+typedef int (*close_range_t)(unsigned, unsigned, int);
 typedef int (*connect_t)(int, const struct sockaddr *, socklen_t);
 typedef struct hostent* (*gethostbyname_t)(const char *);
 typedef int (*freeaddrinfo_t)(struct addrinfo *);
@@ -99,7 +110,7 @@ typedef int (*getaddrinfo_t)(const char *, const char *, const struct addrinfo *
 			     struct addrinfo **);
 
 typedef int (*getnameinfo_t) (const struct sockaddr *, socklen_t, char *, 
-			      socklen_t, char *, socklen_t, int);
+			      GN_NODELEN_T, char *, GN_SERVLEN_T, GN_FLAGS_T);
 
 typedef ssize_t (*sendto_t) (int sockfd, const void *buf, size_t len, int flags,
 			     const struct sockaddr *dest_addr, socklen_t addrlen);

src/libproxychains.c

@@ -22,6 +22,7 @@
 #include <unistd.h>
 #include <stdlib.h>
 #include <string.h>
+#include <limits.h>
 #include <ctype.h>
 #include <errno.h>
 #include <assert.h>
@@ -55,6 +56,7 @@ connect_t true___xnet_connect;
 #endif
 
 close_t true_close;
+close_range_t true_close_range;
 connect_t true_connect;
 gethostbyname_t true_gethostbyname;
 getaddrinfo_t true_getaddrinfo;
@@ -85,13 +87,14 @@ static int init_l = 0;
 
 static void get_chain_data(proxy_data * pd, unsigned int *proxy_count, chain_type * ct);
 
-static void* load_sym(char* symname, void* proxyfunc) {
+static void* load_sym(char* symname, void* proxyfunc, int is_mandatory) {
-
 	void *funcptr = dlsym(RTLD_NEXT, symname);
 
-	if(!funcptr) {
+	if(is_mandatory && !funcptr) {
 		fprintf(stderr, "Cannot load symbol '%s' %s\n", symname, dlerror());
 		exit(1);
+	} else if (!funcptr) {
+		return funcptr;
 	} else {
 		PDEBUG("loaded symbol '%s'" " real addr %p  wrapped addr %p\n", symname, funcptr, proxyfunc);
 	}
@@ -102,44 +105,56 @@ static void* load_sym(char* symname, void* proxyfunc) {
 	return funcptr;
 }
 
-#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);
-}
 
+typedef struct {
+	unsigned int first, last, flags;
+} close_range_args_t;
+
+/* If there is some `close` or `close_range` system call before do_init, 
+   we buffer it, and actually execute them in do_init. */
 static int close_fds[16];
 static int close_fds_cnt = 0;
+static close_range_args_t close_range_buffer[16];
+static int close_range_buffer_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));
+	char *env;
+
+	srand(get_rand_seed());
 	core_initialize();
 
-	/* read the config file */
+	env = getenv(PROXYCHAINS_QUIET_MODE_ENV_VAR);
-	get_chain_data(proxychains_pd, &proxychains_proxy_count, &proxychains_ct);
+	if(env && *env == '1')
-	DUMP_PROXY_CHAIN(proxychains_pd, proxychains_proxy_count);
+		proxychains_quiet_mode = 1;
 
 	proxychains_write_log(LOG_PREFIX "DLL init: proxychains-ng %s\n", proxychains_get_version());
 
 	setup_hooks();
 
+	/* read the config file */
+	get_chain_data(proxychains_pd, &proxychains_proxy_count, &proxychains_ct);
+	DUMP_PROXY_CHAIN(proxychains_pd, proxychains_proxy_count);
+
 	while(close_fds_cnt) true_close(close_fds[--close_fds_cnt]);
+	while(close_range_buffer_cnt) {
+		int i = --close_range_buffer_cnt;
+		true_close_range(close_range_buffer[i].first, close_range_buffer[i].last, close_range_buffer[i].flags);
+	}
 	init_l = 1;
 
 	rdns_init(proxychains_resolver);
@@ -153,16 +168,19 @@ static void init_lib_wrapper(const char* caller) {
 	pthread_once(&init_once, do_init);
 }
 
-/* if we use gcc >= 3, we can instruct the dynamic loader 
+/* 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 
+ * race condition if 2 threads call it before init_l is set
  * and PTHREAD support was disabled */
-#if __GNUC__ > 2
+#if __GNUC__+0 > 2
 __attribute__((constructor))
 static void gcc_init(void) {
-	INIT();
+	init_lib_wrapper(__FUNCTION__);
 }
+#define INIT() do {} while(0)
+#else
+#define INIT() init_lib_wrapper(__FUNCTION__)
 #endif
 
 
@@ -272,8 +290,7 @@ static void get_chain_data(proxy_data * pd, unsigned int *proxy_count, chain_typ
 	int count = 0, port_n = 0, list = 0;
 	char buf[1024], type[1024], host[1024], user[1024];
 	char *buff, *env, *p;
-	char local_in_addr_port[32];
+	char local_addr_port[64], local_addr[64], local_netmask[32];
-	char local_in_addr[32], local_in_port[32], local_netmask[32];
 	char dnat_orig_addr_port[32], dnat_new_addr_port[32];
 	char dnat_orig_addr[32], dnat_orig_port[32], dnat_new_addr[32], dnat_new_port[32];
 	char rdnsd_addr[32], rdnsd_port[8];
@@ -296,10 +313,6 @@ static void get_chain_data(proxy_data * pd, unsigned int *proxy_count, chain_typ
         	exit(1);
 	}
 
-	env = getenv(PROXYCHAINS_QUIET_MODE_ENV_VAR);
-	if(env && *env == '1')
-		proxychains_quiet_mode = 1;
-
 	while(fgets(buf, sizeof(buf), file)) {
 		buff = buf;
 		/* remove leading whitespace */
@@ -338,7 +351,7 @@ static void get_chain_data(proxy_data * pd, unsigned int *proxy_count, chain_typ
 					if(*ct == STRICT_TYPE && proxychains_resolver >= DNSLF_RDNS_START && count > 0) {
 						/* we can allow dns hostnames for all but the first proxy in the list if chaintype is strict, as remote lookup can be done */
 						rdns_init(proxychains_resolver);
-						ip_type4 internal_ip = at_get_ip_for_host(host, strlen(host));
+						ip_type4 internal_ip = rdns_get_ip_for_host(host, strlen(host));
 						pd[count].ip.is_v6 = 0;
 						host_ip->addr.v4 = internal_ip;
 						if(internal_ip.as_int == IPT4_INVALID.as_int)
@@ -388,42 +401,76 @@ inv_host:
 						exit(1);
 					}
 				} else if(STR_STARTSWITH(buff, "localnet")) {
-					if(sscanf(buff, "%s %21[^/]/%15s", user, local_in_addr_port, local_netmask) < 3) {
+					char colon, extra, right_bracket[2];
+					unsigned short local_port = 0, local_prefix;
+					int local_family, n, valid;
+					if(sscanf(buff, "%s %53[^/]/%15s%c", user, local_addr_port, local_netmask, &extra) != 3) {
 						fprintf(stderr, "localnet format error");
 						exit(1);
 					}
-					/* clean previously used buffer */
+					p = strchr(local_addr_port, ':');
-					memset(local_in_port, 0, sizeof(local_in_port) / sizeof(local_in_port[0]));
+					if(!p || p == strrchr(local_addr_port, ':')) {
-
+						local_family = AF_INET;
-					if(sscanf(local_in_addr_port, "%15[^:]:%5s", local_in_addr, local_in_port) < 2) {
+						n = sscanf(local_addr_port, "%15[^:]%c%5hu%c", local_addr, &colon, &local_port, &extra);
-						PDEBUG("added localnet: netaddr=%s, netmask=%s\n",
+						valid = n == 1 || (n == 3 && colon == ':');
-						       local_in_addr, local_netmask);
+					} else if(local_addr_port[0] == '[') {
+						local_family = AF_INET6;
+						n = sscanf(local_addr_port, "[%45[^][]%1[]]%c%5hu%c", local_addr, right_bracket, &colon, &local_port, &extra);
+						valid = n == 2 || (n == 4 && colon == ':');
 					} else {
-						PDEBUG("added localnet: netaddr=%s, port=%s, netmask=%s\n",
+						local_family = AF_INET6;
-						       local_in_addr, local_in_port, local_netmask);
+						valid = sscanf(local_addr_port, "%45[^][]%c", local_addr, &extra) == 1;
+					}
+					if(!valid) {
+						fprintf(stderr, "localnet address or port error\n");
+						exit(1);
+					}
+					if(local_port) {
+						PDEBUG("added localnet: netaddr=%s, port=%u, netmask=%s\n",
+						       local_addr, local_port, local_netmask);
+					} else {
+						PDEBUG("added localnet: netaddr=%s, netmask=%s\n",
+						       local_addr, local_netmask);
 					}
 					if(num_localnet_addr < MAX_LOCALNET) {
-						int error;
+						localnet_addr[num_localnet_addr].family = local_family;
-						error =
+						localnet_addr[num_localnet_addr].port = local_port;
-						    inet_pton(AF_INET, local_in_addr,
+						valid = 0;
-							      &localnet_addr[num_localnet_addr].in_addr);
+						if (local_family == AF_INET) {
-						if(error <= 0) {
+							valid =
+							    inet_pton(local_family, local_addr,
+							              &localnet_addr[num_localnet_addr].in_addr) > 0;
+						} else if(local_family == AF_INET6) {
+							valid =
+							    inet_pton(local_family, local_addr,
+							              &localnet_addr[num_localnet_addr].in6_addr) > 0;
+						}
+						if(!valid) {
 							fprintf(stderr, "localnet address error\n");
 							exit(1);
 						}
-						error =
+						if(local_family == AF_INET && strchr(local_netmask, '.')) {
-						    inet_pton(AF_INET, local_netmask,
+							valid =
-							      &localnet_addr[num_localnet_addr].netmask);
+							    inet_pton(local_family, local_netmask,
-						if(error <= 0) {
+							              &localnet_addr[num_localnet_addr].in_mask) > 0;
+						} else {
+							valid = sscanf(local_netmask, "%hu%c", &local_prefix, &extra) == 1;
+							if (valid) {
+								if(local_family == AF_INET && local_prefix <= 32) {
+									localnet_addr[num_localnet_addr].in_mask.s_addr =
+										htonl(0xFFFFFFFFu << (32u - local_prefix));
+								} else if(local_family == AF_INET6 && local_prefix <= 128) {
+									localnet_addr[num_localnet_addr].in6_prefix =
+										local_prefix;
+								} else {
+									valid = 0;
+								}
+							}
+						}
+						if(!valid) {
 							fprintf(stderr, "localnet netmask error\n");
 							exit(1);
 						}
-						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 {
 						fprintf(stderr, "# of localnet exceed %d.\n", MAX_LOCALNET);
@@ -527,7 +574,14 @@ 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;
@@ -548,7 +602,71 @@ 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) {
+
+static void intsort(int *a, int n) {
+	int i, j, s;
+	for(i=0; i<n; ++i)
+		for(j=i+1; j<n; ++j)
+			if(a[j] < a[i]) {
+				s = a[i];
+				a[i] = a[j];
+				a[j] = s;
+			}
+}
+
+/* Warning: Linux manual says the third arg is `unsigned int`, but unistd.h says `int`. */
+HOOKFUNC(int, close_range, unsigned first, unsigned last, int flags) {
+	if(true_close_range == NULL) {
+		fprintf(stderr, "Calling close_range, but this platform does not provide this system call. ");
+		return -1;
+	}
+	if(!init_l) {
+		/* push back to cache, and delay the execution. */
+		if(close_range_buffer_cnt >= (sizeof close_range_buffer / sizeof close_range_buffer[0])) {
+			errno = ENOMEM;
+			return -1;
+		}
+		int i = close_range_buffer_cnt++;
+		close_range_buffer[i].first = first;
+		close_range_buffer[i].last = last;
+		close_range_buffer[i].flags = flags;
+		return errno = 0;
+	}
+	if(proxychains_resolver != DNSLF_RDNS_THREAD) return true_close_range(first, last, flags);
+
+	/* prevent rude programs (like ssh) from closing our pipes */
+	int res = 0, uerrno = 0, i;
+	int protected_fds[] = {req_pipefd[0], req_pipefd[1], resp_pipefd[0], resp_pipefd[1]};
+	intsort(protected_fds, 4);
+	/* We are skipping protected_fds while calling true_close_range()
+	 * If protected_fds cut the range into some sub-ranges, we close sub-ranges BEFORE cut point in the loop. 
+	 * [first, cut1-1] , [cut1+1, cut2-1] , [cut2+1, cut3-1]
+	 * Finally, we delete the remaining sub-range, outside the loop. [cut3+1, tail]
+	 */
+	int next_fd_to_close = first;
+	for(i = 0; i < 4; ++i) {
+		if(protected_fds[i] < first || protected_fds[i] > last)
+			continue;
+		int prev = (i == 0 || protected_fds[i-1] < first) ? first : protected_fds[i-1]+1;
+		if(prev != protected_fds[i]) {
+			if(-1 == true_close_range(prev, protected_fds[i]-1, flags)) {
+				res = -1;
+				uerrno = errno;
+			}
+		}
+		next_fd_to_close = protected_fds[i]+1;
+	}
+	if(next_fd_to_close <= last) {
+		if(-1 == true_close_range(next_fd_to_close, last, flags)) {
+			res = -1;
+			uerrno = errno;
+		}
+	}
+	errno = uerrno;
+	return res;
+}
+
+HOOKFUNC(int, connect, int sock, const struct sockaddr *addr, unsigned int len) {
 	INIT();
 	PFUNC();
 
@@ -611,14 +729,24 @@ int connect(int sock, const struct sockaddr *addr, unsigned int len) {
 			port = dnat->new_port;
 	}
 
-	if (!v6) for(i = 0; i < num_localnet_addr && !remote_dns_connect; i++) {
+	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)
+		if (localnet_addr[i].port && localnet_addr[i].port != port)
-		   == (p_addr_in->s_addr & localnet_addr[i].netmask.s_addr)) {
+			continue;
-			if(!localnet_addr[i].port || localnet_addr[i].port == port) {
+		if (localnet_addr[i].family != (v6 ? AF_INET6 : AF_INET))
-				PDEBUG("accessing localnet using true_connect\n");
+			continue;
-				return true_connect(sock, addr, len);
+		if (v6) {
-			}
+			size_t prefix_bytes = localnet_addr[i].in6_prefix / CHAR_BIT;
+			size_t prefix_bits = localnet_addr[i].in6_prefix % CHAR_BIT;
+			if (prefix_bytes && memcmp(p_addr_in6->s6_addr, localnet_addr[i].in6_addr.s6_addr, prefix_bytes) != 0)
+				continue;
+			if (prefix_bits && (p_addr_in6->s6_addr[prefix_bytes] ^ localnet_addr[i].in6_addr.s6_addr[prefix_bytes]) >> (CHAR_BIT - prefix_bits))
+				continue;
+		} else {
+			if((p_addr_in->s_addr ^ localnet_addr[i].in_addr.s_addr) & localnet_addr[i].in_mask.s_addr)
+				continue;
 		}
+		PDEBUG("accessing localnet using true_connect\n");
+		return true_connect(sock, addr, len);
 	}
 
 	flags = fcntl(sock, F_GETFL, 0);
@@ -639,13 +767,13 @@ 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);
 
@@ -659,7 +787,7 @@ 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");
 
@@ -669,7 +797,7 @@ 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);
 
@@ -679,9 +807,9 @@ 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,
+	           char *host, GN_NODELEN_T hostlen, char *serv,
-	           socklen_t servlen, int flags)
+	           GN_SERVLEN_T servlen, GN_FLAGS_T flags)
 {
 	INIT();
 	PFUNC();
@@ -723,7 +851,7 @@ 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");
 
@@ -759,7 +887,7 @@ 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();
@@ -773,3 +901,45 @@ 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)
+#define SETUP_SYM_OPTIONAL(X)
+#else
+#define SETUP_SYM_IMPL(X, IS_MANDATORY) do { if (! true_ ## X ) true_ ## X = load_sym( # X, X, IS_MANDATORY ); } while(0)
+#define SETUP_SYM(X) SETUP_SYM_IMPL(X, 1)
+#define SETUP_SYM_OPTIONAL(X) SETUP_SYM_IMPL(X, 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);
+	SETUP_SYM_OPTIONAL(close_range);
+}
+
+#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/main.c

@@ -135,16 +135,20 @@ int main(int argc, char *argv[]) {
 	if(!quiet)
 		fprintf(stderr, LOG_PREFIX "preloading %s/%s\n", prefix, dll_name);
 
+#if defined(IS_MAC) || defined(IS_OPENBSD)
+#define LD_PRELOAD_SEP ":"
+#else
+/* Dynlinkers for Linux and most BSDs seem to support space
+   as LD_PRELOAD separator, with colon added only recently.
+   We use the old syntax for maximum compat */
+#define LD_PRELOAD_SEP " "
+#endif
+
 #ifdef IS_MAC
 	putenv("DYLD_FORCE_FLAT_NAMESPACE=1");
 #define LD_PRELOAD_ENV "DYLD_INSERT_LIBRARIES"
-#define LD_PRELOAD_SEP ":"
 #else
 #define LD_PRELOAD_ENV "LD_PRELOAD"
-/* all historic implementations of BSD and linux dynlinkers seem to support
-   space as LD_PRELOAD separator, with colon added only recently.
-   we use the old syntax for maximum compat */
-#define LD_PRELOAD_SEP " "
 #endif
 	char *old_val = getenv(LD_PRELOAD_ENV);
 	snprintf(buf, sizeof(buf), LD_PRELOAD_ENV "=%s/%s%s%s",
@@ -154,7 +158,8 @@ int main(int argc, char *argv[]) {
 	         old_val ? old_val : "");
 	putenv(buf);
 	execvp(argv[start_argv], &argv[start_argv]);
-	perror("proxychains can't load process....");
+	fprintf(stderr, "proxychains: can't load process '%s'.", argv[start_argv]);
+	perror(" (hint: it's probably a typo)");
 
 	return EXIT_FAILURE;
 }

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

@@ -53,9 +53,9 @@ strict_chain
 
 # method 1. this uses the proxychains4 style method to do remote dns:
 # a thread is spawned that serves DNS requests and hands down an ip
-# assigned from an internal list (via remote_dns_subset).
+# assigned from an internal list (via remote_dns_subnet).
 # this is the easiest (setup-wise) and fastest method, however on
-# systems with buggy libcs and very complex software like webbrosers
+# systems with buggy libcs and very complex software like webbrowsers
 # this might not work and/or cause crashes.
 proxy_dns
 
@@ -94,7 +94,7 @@ tcp_connect_time_out 8000
 
 ### Examples for localnet exclusion
 ## localnet ranges will *not* use a proxy to connect.
-## note that localnet works only when plain IPv4 addresses are passed to the app,
+## note that localnet works only when plain IP addresses are passed to the app,
 ## the hostname resolves via /etc/hosts, or proxy_dns is disabled or proxy_dns_old used.
 
 ## Exclude connections to 192.168.1.0/24 with port 80
@@ -105,12 +105,14 @@ tcp_connect_time_out 8000
 
 ## Exclude connections to ANYwhere with port 80
 # localnet 0.0.0.0:80/0.0.0.0
+# localnet [::]:80/0
 
-## RFC5735 Loopback address range
+## RFC6890 Loopback address range
 ## if you enable this, you have to make sure remote_dns_subnet is not 127
 ## you'll need to enable it if you want to use an application that 
 ## connects to localhost.
 # localnet 127.0.0.0/255.0.0.0
+# localnet ::1/128
 
 ## RFC1918 Private Address Ranges
 # localnet 10.0.0.0/255.0.0.0

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;
 }