proxychains.conf: add hint that proxy must be in ipv4 notation

it is generally invalid to use a DNS name since DNS subsystem
is only available once connected to the proxy; because
DNS is done server-side.

closes #19

Makefile

@@ -49,13 +49,13 @@ CFLAGS_MAIN=-DLIB_DIR=\"$(libdir)\" -DSYSCONFDIR=\"$(sysconfdir)\" -DDLL_NAME=\"
 all: $(ALL_LIBS) $(ALL_TOOLS)
 
 install-config:
-	install -d $(DESTDIR)/$(sysconfdir)
-	install $(INSTALL_FLAGS) 644 src/proxychains.conf $(DESTDIR)/$(sysconfdir)/
+	install -d $(DESTDIR)$(sysconfdir)
+	install $(INSTALL_FLAGS) 644 src/proxychains.conf $(DESTDIR)$(sysconfdir)/
 
 install: 
-	install -d $(DESTDIR)/$(bindir)/ $(DESTDIR)/$(libdir)/
-	install $(INSTALL_FLAGS) 755 $(ALL_TOOLS) $(DESTDIR)/$(bindir)/
-	install $(INSTALL_FLAGS) 644 $(ALL_LIBS) $(DESTDIR)/$(libdir)/
+	install -d $(DESTDIR)$(bindir)/ $(DESTDIR)$(libdir)/
+	install $(INSTALL_FLAGS) 755 $(ALL_TOOLS) $(DESTDIR)$(bindir)/
+	install $(INSTALL_FLAGS) 644 $(ALL_LIBS) $(DESTDIR)$(libdir)/
 
 clean:
 	rm -f $(ALL_LIBS)

README

@@ -150,3 +150,7 @@ Usage Example:
 in this example it will resolve targethost.com through proxy(or chained proxies)
 specified by proxychains.conf
 
+Community:
+----------
+#proxychains on irc.freenode.net
+

src/libproxychains.c

@@ -168,7 +168,11 @@ static void get_chain_data(proxy_data * pd, unsigned int *proxy_count, chain_typ
 	*ct = DYNAMIC_TYPE;
 	
 	env = get_config_path(getenv(PROXYCHAINS_CONF_FILE_ENV_VAR), buff, sizeof(buff));
-	file = fopen(env, "r");
+	if( ( file = fopen(env, "r") ) == NULL )
+	{
+	        perror("couldnt read configuration file");
+        	exit(1);
+	}
 
 	env = getenv(PROXYCHAINS_QUIET_MODE_ENV_VAR);
 	if(env && *env == '1')
@@ -188,7 +192,12 @@ static void get_chain_data(proxy_data * pd, unsigned int *proxy_count, chain_typ
 
 				sscanf(buff, "%s %s %d %s %s", type, host, &port_n, pd[count].user, pd[count].pass);
 
-				pd[count].ip.as_int = (uint32_t) inet_addr(host);
+				in_addr_t host_ip = inet_addr(host);
+				if(host_ip == INADDR_NONE) {
+					fprintf(stderr, "proxy %s has invalid value or is not numeric\n", host);
+					exit(1);
+				}
+				pd[count].ip.as_int = (uint32_t) host_ip;
 				pd[count].port = htons((unsigned short) port_n);
 
 				if(!strcmp(type, "http")) {

src/proxychains.conf

@@ -77,9 +77,11 @@ tcp_connect_time_out 8000
 # localnet 192.168.0.0/255.255.0.0
 
 # ProxyList format
-#       type  host  port [user pass]
+#       type  ip  port [user pass]
 #       (values separated by 'tab' or 'blank')
 #
+#       only numeric ipv4 addresses are valid
+#
 #
 #        Examples:
 #