fixed a couple of bugs, warnings, added basic gethostbyaddr support and a plain Makefile

.gitignore

@@ -8,5 +8,4 @@
 # Autoconf stuff 
 libtool
 config.*
-Makefile
 stamp-h

Makefile

@@ -0,0 +1,76 @@
+#
+# Makefile for proxychains (requires GNU make), stolen from musl
+#
+# Use config.mak to override any of the following variables.
+# Do not make changes here.
+#
+
+exec_prefix = /usr/local
+bindir = $(exec_prefix)/bin
+
+prefix = /usr/local/
+includedir = $(prefix)/include
+libdir = $(prefix)/lib
+syslibdir = /lib
+
+SRCS = $(sort $(wildcard src/*.c))
+OBJS = $(SRCS:.c=.o)
+LOBJS = $(OBJS:.o=.lo)
+
+CFLAGS  += -Wall -O0 -g -std=c99 -D_GNU_SOURCE -pipe 
+LDFLAGS = -shared -fPIC -ldl
+INC     = 
+PIC     = -fPIC -O0
+AR      = $(CROSS_COMPILE)ar
+RANLIB  = $(CROSS_COMPILE)ranlib
+
+SHARED_LIBS = lib/libproxychains.so
+ALL_LIBS = $(SHARED_LIBS)
+ALL_TOOLS = proxychains
+
+LDSO_PATHNAME = libproxychains.so.3
+
+-include config.mak
+
+CFLAGS_MAIN=-DLIB_DIR=\"$(libdir)\"
+
+
+all: $(ALL_LIBS) $(ALL_TOOLS)
+
+#install: $(ALL_LIBS:lib/%=$(DESTDIR)$(libdir)/%) $(DESTDIR)$(LDSO_PATHNAME)
+install: 
+	install -D -m 644 proxychains $(bindir)
+	install -D -m 644 src/proxyresolv $(bindir)
+	install -D -m 644 lib/libproxychains.so $(libdir)
+	ln -sf $(libdir)/libproxychains.so $(libdir)/libproxychains.so.3
+
+clean:
+	rm -f $(OBJS)
+	rm -f $(LOBJS)
+	rm -f $(ALL_LIBS) lib/*.[ao] lib/*.so
+
+%.o: %.c
+	$(CC) $(CFLAGS) $(CFLAGS_MAIN) $(INC) -c -o $@ $<
+
+%.lo: %.c
+	$(CC) $(CFLAGS) $(CFLAGS_MAIN) $(INC) $(PIC) -c -o $@ $<
+
+lib/libproxychains.so: $(LOBJS)
+	$(CC) $(LDFLAGS) -Wl,-soname=libproxychains.so -o $@ $(LOBJS) -lgcc
+
+lib/%.o:
+	cp $< $@
+
+$(ALL_TOOLS): $(OBJS)
+	$(CC) src/main.o -o proxychains
+
+$(DESTDIR)$(libdir)/%.so: lib/%.so
+	install -D -m 755 $< $@
+
+$(DESTDIR)$(libdir)/%: lib/%
+	install -D -m 644 $< $@
+
+$(DESTDIR)$(LDSO_PATHNAME): lib/libproxychains.so
+	ln -sf $(libdir)/libproxychains.so $@ || true
+
+.PHONY: all clean install

src/core.c

@@ -126,9 +126,9 @@ int proxychains_write_log(char *str,...)
 
 static int write_n_bytes(int fd,char *buff,size_t size)
 {
-  int i=0,wrote=0;
+	int i=0;
-  for(;;)
+	size_t wrote=0;
-  {
+	for(;;)	{
 		i = write(fd,&buff[wrote],size-wrote);
 		if(i<=0)
 			return i;
@@ -138,31 +138,10 @@ static int write_n_bytes(int fd,char *buff,size_t size)
 	}
 }
 
-static int read_line(int fd, char *buff, size_t size)
-{
-  int i,ready;
-  struct pollfd pfd[1];
-
-  pfd[0].fd=fd;
-  pfd[0].events=POLLIN;
-  for(i=0;i<size-1;i++)
-  {
-    pfd[0].revents=0;
-    ready=poll_retry(pfd,1,tcp_read_time_out);
-    if(ready!=1 || !(pfd[0].revents&POLLIN) || 1!=read(fd,&buff[i],1))
-      return -1;
-    else if(buff[i]=='\n')
-    {
-        buff[i+1]=0;
-        return (i+1);
-    }
-  }
-  return -1;
-}
-
 static int read_n_bytes(int fd,char *buff, size_t size)
 {
-  int i,ready;
+	int ready;
+	size_t i;
 	struct pollfd pfd[1];
 
 	pfd[0].fd=fd;
@@ -173,10 +152,10 @@ static int read_n_bytes(int fd,char *buff, size_t size)
 		if(ready != 1 || !(pfd[0].revents&POLLIN) || 1 != read(fd,&buff[i],1))
 			return -1;
 	}
-  return size;
+	return (int) size;
 }
 
-static int timed_connect(int sock, const struct sockaddr *addr, unsigned int len)
+static int timed_connect(int sock, const struct sockaddr *addr, socklen_t len)
 {
 	int ret, value;
 	socklen_t value_len;
@@ -186,14 +165,23 @@ static int timed_connect(int sock, const struct sockaddr *addr, unsigned int len
 	pfd[0].events=POLLOUT;	
 	fcntl(sock, F_SETFL, O_NONBLOCK);
   	ret = true_connect(sock, addr,  len);
-//	printf("\nconnect ret=%d\n",ret);fflush(stdout);
+#ifdef DEBUG
+	if(ret == -1) perror("true_connect");
+	printf("\nconnect ret=%d\n",ret);
+	
+	fflush(stdout);
+#endif
   	if(ret==-1 && errno==EINPROGRESS) {
 		ret=poll_retry(pfd,1,tcp_connect_time_out);
-		//printf("\npoll ret=%d\n",ret);fflush(stdout);
+#ifdef DEBUG
+		printf("\npoll ret=%d\n",ret);fflush(stdout);
+#endif
 	      	if(ret == 1) {
 			value_len=sizeof(socklen_t);
 			getsockopt(sock,SOL_SOCKET,SO_ERROR,&value,&value_len) ;
-			//printf("\nvalue=%d\n",value);fflush(stdout);
+#ifdef DEBUG
+			printf("\nvalue=%d\n",value);fflush(stdout);
+#endif
         	       	if(!value)
 				ret=0;
 			else
@@ -212,6 +200,9 @@ static int timed_connect(int sock, const struct sockaddr *addr, unsigned int len
 
 static int tunnel_to(int sock, unsigned int ip, unsigned short port, proxy_type pt,char *user,char *pass)
 {
+#ifdef DEBUG
+	PDEBUG("tunnel to\n");
+#endif	
         int len;
         char buff[BUFF_SIZE];
         memset (buff, 0, sizeof(buff));
@@ -428,9 +419,9 @@ error:
 }
 
 static proxy_data * select_proxy(select_type how, 
-		proxy_data *pd, int proxy_count, int *offset)
+		proxy_data *pd, unsigned int proxy_count, unsigned int *offset)
 {
-	int i=0,k=0;
+	unsigned int i=0, k=0;
 	if(*offset >= proxy_count)
 		return NULL;
 	switch(how) {
@@ -438,7 +429,7 @@ static proxy_data * select_proxy(select_type how,
 			srand(time(NULL));
 			do {
 				k++;
-				i = 0 + (int) (proxy_count*1.0*rand()/
+				i = 0 + (unsigned int) (proxy_count * 1.0 * rand()/
 						(RAND_MAX + 1.0));
 			} while (pd[i].ps != PLAY_STATE && k < proxy_count*100 );
 		break;
@@ -454,30 +445,30 @@ static proxy_data * select_proxy(select_type how,
 	}
 	if (i >= proxy_count)
 		i = 0;
-	return pd[i].ps==PLAY_STATE?&pd[i]:NULL;
+	return (pd[i].ps == PLAY_STATE)? &pd[i] : NULL;
 }
 
 
-static void release_all(proxy_data *pd, int proxy_count)
+static void release_all(proxy_data *pd, unsigned int proxy_count)
 {
-	int i;
+	unsigned int i;
 	for(i=0; i<proxy_count; i++)
 		pd[i].ps = PLAY_STATE;
 	return;
 }
 
-static void release_busy(proxy_data *pd, int proxy_count)
+static void release_busy(proxy_data *pd, unsigned int proxy_count)
 {
-	int i;
+	unsigned int i;
 	for(i=0; i<proxy_count; i++)
 		if(pd[i].ps == BUSY_STATE)
 			pd[i].ps = PLAY_STATE;
 	return;
 }
 
-static int calc_alive(proxy_data *pd, int proxy_count)
+static unsigned int calc_alive(proxy_data *pd, unsigned int proxy_count)
 {
-	int i;
+	unsigned int i;
 	int alive_count=0;
 	release_busy(pd, proxy_count);
 	for(i=0; i<proxy_count; i++)
@@ -490,6 +481,9 @@ static int calc_alive(proxy_data *pd, int proxy_count)
 static int chain_step(int ns, proxy_data *pfrom, proxy_data *pto)
 {
 	int retcode=-1;
+#ifdef DEBUG
+	PDEBUG("chain_step()\n");
+#endif
 	
 	proxychains_write_log("<>-%s:%d-", 
 			inet_ntoa(*(struct in_addr*)&pto->ip),
@@ -517,14 +511,14 @@ static int chain_step(int ns, proxy_data *pfrom, proxy_data *pto)
 
 int connect_proxy_chain( int sock, unsigned int target_ip, 
 		unsigned short target_port, proxy_data *pd, 
-		unsigned int proxy_count, chain_type ct, int max_chain )
+		unsigned int proxy_count, chain_type ct, unsigned int max_chain )
 {
 	proxy_data p4;
 	proxy_data *p1,*p2,*p3;
 	int ns=-1;
-	int offset=0;
+	unsigned int offset=0;
-	int alive_count=0;
+	unsigned int alive_count=0;
-	int curr_len=0;
+	unsigned int curr_len=0;
 
 #define TP "<>"
 #define DT "|D-chain|"
@@ -532,8 +526,12 @@ int connect_proxy_chain( int sock, unsigned int target_ip,
 #define RT "|R-chain|"
 	
 	p3=&p4;
+#ifdef DEBUG
+	PDEBUG("connect_proxy_chain\n");
+#endif
 	
 again:
+
 	switch(ct)  {
 		case DYNAMIC_TYPE:
 		alive_count=calc_alive(pd,proxy_count);
@@ -546,8 +544,12 @@ again:
 			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)) {
+				#ifdef DEBUG
+				PDEBUG("GOTO AGAIN 1\n");
+				#endif
 				goto again;
+			}
 			p1=p2;
 		}
 		proxychains_write_log(TP);
@@ -560,15 +562,27 @@ again:
 	case STRICT_TYPE:
 		alive_count=calc_alive(pd, proxy_count);
 		offset=0;
-		if(!(p1=select_proxy(FIFOLY,pd,proxy_count,&offset)))
+		if(!(p1=select_proxy(FIFOLY, pd, proxy_count, &offset))) {
+			#ifdef DEBUG
+			PDEBUG("select_proxy failed\n");
+			#endif
 			goto error_strict;
-		if(SUCCESS!=start_chain(&ns,p1,ST))
+		}
+		if(SUCCESS!=start_chain(&ns, p1, ST)) {
+			#ifdef DEBUG
+			PDEBUG("start_chain failed\n");
+			#endif
 			goto error_strict;
+		}
 		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)) {
+				#ifdef DEBUG
+				PDEBUG("chain_step failed\n");
+				#endif
 				goto error_strict;
+			}
 			p1=p2;
 		}
 		proxychains_write_log(TP);
@@ -590,8 +604,12 @@ again:
 		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)) {
+				#ifdef DEBUG
+				PDEBUG("GOTO AGAIN 2\n");
+				#endif
 				goto again;
+			}	
 			p1=p2;
 		}
 		proxychains_write_log(TP);
@@ -602,7 +620,6 @@ again:
 			
 	}
 
-done:
 	proxychains_write_log("<><>-OK\n");
 	dup2(ns,sock);
 	close(ns);
@@ -616,6 +633,9 @@ error:
 error_more:
 	proxychains_write_log("\n!!!need more proxies!!!\n");
 error_strict:
+	#ifdef DEBUG
+	PDEBUG("error\n");
+	#endif
 	release_all(pd,proxy_count);
 	if(ns!=-1)
 		close(ns);
@@ -648,7 +668,7 @@ struct hostent* proxy_gethostbyname(const char *name)
 	
 	// TODO: this works only once, so cache it  ...
 	// 	 later
-	while (hp=gethostent())
+	while ((hp=gethostent()))
 		if (!strcmp(hp->h_name,name)) 
 			return hp; 
 	
@@ -679,7 +699,7 @@ struct hostent* proxy_gethostbyname(const char *name)
 			close(pipe_fd[0]);
 got_buff:
 			addr = inet_addr(buff);
-			if (addr == -1)
+			if (addr == (in_addr_t) (-1))
 				goto err_dns;
 			memcpy(*(hostent_space.h_addr_list),
 						&addr ,sizeof(struct in_addr));
@@ -690,7 +710,8 @@ got_buff:
 			name, inet_ntoa(*(struct in_addr*)&addr));
 	return &hostent_space;
 err_dns:
-	proxychains_write_log("|DNS-response|: %s is not exist\n", name);
+	proxychains_write_log("|DNS-response|: %s does not exist\n", name);
+	perror("err_dns");
 err:
 	return NULL;
 }

src/core.h

@@ -41,8 +41,7 @@ typedef struct
 	unsigned short port;
 } localaddr_arg;
 
-typedef struct
+typedef struct {
-{
 	unsigned int ip;
 	unsigned short port;
 	proxy_type pt;
@@ -51,8 +50,7 @@ char user[256];
 	char pass[256];
 } proxy_data;
 
-typedef struct
+typedef struct {
-{
 	proxy_data *pd;
  	chain_type ct;
   	unsigned int proxy_count;
@@ -68,7 +66,7 @@ int connect_proxy_chain (
 		proxy_data * pd,
 		unsigned int proxy_count,
 		chain_type ct,
-		int max_chain );
+		unsigned int max_chain );
 
 int proxychains_write_log(char *str,...);
 struct hostent* proxy_gethostbyname(const char *name);
@@ -103,7 +101,7 @@ int proxy_getaddrinfo(const char *node, const char *service,
 
 struct hostent* proxy_gethostbyname(const char *name);
 
-#if 0
+#ifdef DEBUG
 # define PDEBUG(fmt, args...) fprintf(stderr,"DEBUG:"fmt, ## args)
 #else
 # define PDEBUG(fmt, args...)

src/libproxychains.c

@@ -14,10 +14,10 @@
  *   (at your option) any later version.                                   *
  *                                                                         *
  ***************************************************************************/
+
+#undef _GNU_SOURCE
 #define _GNU_SOURCE
-#ifdef HAVE_CONFIG_H
+
-#include <config.h>
-#endif
 #include <stdio.h>
 #include <unistd.h>
 #include <stdlib.h>
@@ -46,9 +46,9 @@ int tcp_read_time_out;
 int tcp_connect_time_out;
 chain_type proxychains_ct;
 proxy_data proxychains_pd[MAX_CHAIN];
-int proxychains_proxy_count = 0;
+unsigned int proxychains_proxy_count = 0;
 int proxychains_got_chain_data = 0;
-int proxychains_max_chain = 1;
+unsigned int proxychains_max_chain = 1;
 int proxychains_quiet_mode = 0;
 int proxychains_resolver = 0;
 static int init_l = 0;
@@ -61,8 +61,7 @@ static void init_lib(void);
 
 static void init_lib(void)
 {
-//	proxychains_write_log("ProxyChains-"VERSION
+	proxychains_write_log("ProxyChains-3.1 (http://proxychains.sf.net)\n");
-//			" (http://proxychains.sf.net)\n");
 	
 	get_chain_data(proxychains_pd, &proxychains_proxy_count, &proxychains_ct);
 	true_connect = (connect_t) dlsym(RTLD_NEXT, "connect");
@@ -71,10 +70,19 @@ static void init_lib(void)
 		fprintf(stderr, "Cannot load symbol 'connect' %s\n", dlerror());
 		exit(1);
 	} else {
-//		PDEBUG( "loaded symbol 'connect'"
+		#ifdef DEBUG
-//		" real addr %p  wrapped addr %p\n",
+		PDEBUG( "loaded symbol 'connect'"
-//		true_connect, connect);
+		" real addr %p  wrapped addr %p\n",
+		true_connect, connect);
+		#endif
 	}
+	if(connect==true_connect) {
+		#ifdef DEBUG
+		PDEBUG("circular reference detected, aborting!\n");
+		#endif
+		abort();
+	}
+	
 	true_gethostbyname = (gethostbyname_t) 
 		dlsym(RTLD_NEXT, "gethostbyname");
 
@@ -83,9 +91,11 @@ static void init_lib(void)
 				dlerror());
 		exit(1);
 	} else {
-//		PDEBUG( "loaded symbol 'gethostbyname'"
+		#ifdef DEBUG
-//		" real addr %p  wrapped addr %p\n",
+		PDEBUG( "loaded symbol 'gethostbyname'"
-//		true_gethostbyname, gethostbyname);
+		" real addr %p  wrapped addr %p\n",
+		true_gethostbyname, gethostbyname);
+		#endif
 	}
 	true_getaddrinfo = (getaddrinfo_t) 
 		dlsym(RTLD_NEXT, "getaddrinfo");
@@ -95,9 +105,11 @@ static void init_lib(void)
 				dlerror());
 		exit(1);
 	} else {
-//		PDEBUG( "loaded symbol 'getaddrinfo'"
+		#ifdef DEBUG
-//			" real addr %p  wrapped addr %p\n",
+		PDEBUG( "loaded symbol 'getaddrinfo'"
-//			true_getaddrinfo, getaddrinfo);
+			" real addr %p  wrapped addr %p\n",
+			true_getaddrinfo, getaddrinfo);
+		#endif
 	}
 	true_freeaddrinfo = (freeaddrinfo_t) 
 		dlsym(RTLD_NEXT, "freeaddrinfo");
@@ -107,9 +119,11 @@ static void init_lib(void)
 				dlerror());
 		exit(1);
 	} else {
-//		PDEBUG( "loaded symbol 'freeaddrinfo'"
+		#ifdef DEBUG
-//			" real addr %p  wrapped addr %p\n",
+		PDEBUG( "loaded symbol 'freeaddrinfo'"
-//			true_freeaddrinfo, freeaddrinfo);
+			" real addr %p  wrapped addr %p\n",
+			true_freeaddrinfo, freeaddrinfo);
+		#endif
 	}
 	true_gethostbyaddr = (gethostbyaddr_t) 
 		dlsym(RTLD_NEXT, "gethostbyaddr");
@@ -119,9 +133,11 @@ static void init_lib(void)
 				dlerror());
 		exit(1);
 	} else {
-//		PDEBUG( "loaded symbol 'gethostbyaddr'"
+		#ifdef DEBUG
-//			" real addr %p  wrapped addr %p\n",
+		PDEBUG( "loaded symbol 'gethostbyaddr'"
-//			true_gethostbyaddr, gethostbyaddr);
+			" real addr %p  wrapped addr %p\n",
+			true_gethostbyaddr, gethostbyaddr);
+		#endif
 	}
 	true_getnameinfo = (getnameinfo_t) 
 		dlsym(RTLD_NEXT, "getnameinfo");
@@ -131,9 +147,11 @@ static void init_lib(void)
 				dlerror());
 		exit(1);
 	} else {
-//		PDEBUG( "loaded symbol 'getnameinfo'"
+		#ifdef DEBUG
-//			" real addr %p  wrapped addr %p\n",
+		PDEBUG( "loaded symbol 'getnameinfo'"
-//			true_getnameinfo, getnameinfo);
+			" real addr %p  wrapped addr %p\n",
+			true_getnameinfo, getnameinfo);
+		#endif
 	}
 	init_l = 1;
 }
@@ -184,7 +202,7 @@ static inline void get_chain_data(
 	}
 
 	while(fgets(buff,sizeof(buff),file)) {
-		if(buff[strspn(buff," ")]!='#') {
+		if(buff[0] != '\n' && buff[strspn(buff," ")]!='#') {
 			if(list) {
 				memset(&pd[count], 0, sizeof(proxy_data));
 				pd[count].ps=PLAY_STATE;
@@ -201,7 +219,7 @@ static inline void get_chain_data(
 					pd[count].pt=SOCKS5_TYPE;
 				}else continue;
 				
-				if( pd[count].ip && pd[count].ip!=-1 && port_n)
+				if( pd[count].ip && (int) pd[count].ip != -1 && port_n)
 					if(++count==MAX_CHAIN)
 						break;
 			 } else {
@@ -286,8 +304,11 @@ static inline void get_chain_data(
 
 int connect (int sock, const struct sockaddr *addr, unsigned int len)
 {
-	int socktype=0,optlen=0,flags=0,ret=0;
+	int socktype=0, flags=0, ret=0;
+	socklen_t optlen = 0;
+#ifdef DEBUG
 	char str[256];
+#endif
 	struct in_addr *p_addr_in;
 	unsigned short port;
 	size_t i;
@@ -302,10 +323,12 @@ int connect (int sock, const struct sockaddr *addr, unsigned int len)
 	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("target: %s\n", inet_ntop(AF_INET, p_addr_in, str, sizeof(str)));
+	PDEBUG("target: %s\n", inet_ntop(AF_INET, p_addr_in, str, sizeof(str)));
-	//PDEBUG("port: %d\n", port);
+	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))
@@ -346,6 +369,7 @@ struct hostent *gethostbyname(const char *name)
 			
 	return NULL;
 }
+
 int getaddrinfo(const char *node, const char *service,
 		const struct addrinfo *hints,
 		struct addrinfo **res)
@@ -361,6 +385,7 @@ int getaddrinfo(const char *node, const char *service,
 			
 	return ret;
 }
+
 void freeaddrinfo(struct addrinfo *res)
 {
 	PDEBUG("freeaddrinfo %p \n",res);
@@ -375,12 +400,20 @@ void freeaddrinfo(struct addrinfo *res)
 	return;
 }
 
+#ifdef __GLIBC__
+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)
+#endif
 {
 	int ret = 0;
+	PDEBUG("getnameinfo: %s %s\n", host, serv);
 	if(!init_l)
 		init_lib();
 	if(!proxychains_resolver) {
@@ -392,17 +425,55 @@ int getnameinfo (const struct sockaddr * sa,
 		if(servlen) 
 			snprintf(serv, servlen,"%d",ntohs(SOCKPORT(*sa)));
 	}
-	PDEBUG("getnameinfo: %s %s\n", host, serv);
 	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)
 {
-	PDEBUG("TODO: gethostbyaddr hook\n"); 
+	static char buf[16];
+	static char ipv4[4];
+	static char* list[2];
+	static struct hostent he;
+	PDEBUG("TODO: proper gethostbyaddr hook\n");
 	if(!init_l)
 		init_lib();
 	if(!proxychains_resolver)
 		return true_gethostbyaddr(addr,len,type);
+	else {
+		if(len != 4) return NULL;
+		he.h_name = buf;
+		memcpy(ipv4, addr, 4);
+		list[0] = ipv4;
+		list[1] = NULL;
+		he.h_addr_list = list;
+		he.h_addrtype = AF_INET;
+		he.h_aliases = NULL;
+		he.h_length = 4;
+		pc_stringfromipv4((unsigned char*)addr, buf);
+		return &he;
+	}
 	return NULL;
 }
 	

src/main.c

@@ -1,6 +1,6 @@
 /***************************************************************************
                           main.c  -  description
-   q							 -------------------
+
     begin                : Tue May 14 2002
     copyright            :  netcreature (C) 2002
     email                : netcreature@users.sourceforge.net
@@ -15,69 +15,71 @@
  *                                                                         *
  ***************************************************************************/
 
-
-/*
-* 	 well ... actually this file could be a shell script ... but C rulez :).
-*/
-
-#ifdef HAVE_CONFIG_H
-#include <config.h>
-#endif
-
 #include <stdio.h>
 #include <unistd.h>
 #include <stdlib.h>
-#include <memory.h>
+#include <string.h>
 #include <errno.h>
 #include <sys/types.h>
 #include <sys/wait.h>
 
 extern char *optarg;
-extern int optind, opterr, optopt
+extern int optind, opterr, optopt;
 
-/*
+#define PROXYCHAINS_CONF_FILE "proxychains.conf"
- * XXX. Same thing is defined in proxychains main.c it
- * needs to be changed, too.
- */
-#define PROXYCHAINS_CONF_FILE "PROXYCHAINS_CONF_FILE"
-
-static usage(void)
-{
 
+static void usage(char** argv) {
 	printf("\nUsage:	 %s [h] [f] config_file program_name [arguments]\n"
 		"\t for example : proxychains telnet somehost.com\n"
-										"More help in README file\n", argv[0], );
+		"More help in README file\n", argv[0]);
 }
 
-int main(int argc, char *argv[])
+int main(int argc, char *argv[]) {
-{
+	char *path = NULL;
-		char *path;
+	char buf[256];
-
+	char pbuf[256];
-		path = NULL;
+	int opt;
 
 	while ((opt = getopt(argc, argv, "fh:")) != -1) {
 		switch (opt) {
 			case 'h':
-								usage();
+				usage(argv);
 				break;
 			case 'f':
 				path = (char *)optarg;
 				break;
 			default: /* '?' */
-								usage();
+				usage(argv);
 				exit(EXIT_FAILURE);
 			}
 	}
 
-		printf("Proxychains are going to use %s as config file.\n", path);
+	if(!path) {
+		if(!(path = getenv("PROXYCHAINS_CONF_FILE")))
+			path = getcwd(buf, sizeof(buf));
+		else if(access(path, R_OK) != -1) goto have; 
+		if(!path ||
+			!snprintf(pbuf, sizeof(pbuf), "%s/%s", path, PROXYCHAINS_CONF_FILE) ||
+			access(pbuf, R_OK) == -1
+		) 
+			path = "/etc/proxychains.conf";
+		else 
+			path = pbuf;
+	}
+	if(access(path, R_OK) == -1) {
+		perror("couldnt find configuration file");
+		return 1;
+	}
+	have:
+
+	printf("Proxychains is going to use %s as config file.\n", path);
 	printf("argv = %s\n", argv[1]);
 
-		/* Set PROXYCHAINS_CONF_FILE to get proxychains lib to
+	/* Set PROXYCHAINS_CONF_FILE to get proxychains lib to use new config file. */
-			 use new config file. */
+	setenv("PROXYCHAINS_CONF_FILE", path, 1);
-		setenv(PROXYCHAINS_CONF_FILE, path, 1);
 	
-		/*XXX. proxychains might be installed in some different location */
+	snprintf(buf, sizeof(buf), "LD_PRELOAD=%s/libproxychains.so", LIB_DIR);
-  putenv("LD_PRELOAD=/usr/lib/libproxychains.so");
+	putenv(buf);
 	execvp(argv[1], &argv[1]);
 	perror("proxychains can't load process....");