Added optional support for TCP wrappers

INSTALL

@@ -27,6 +27,23 @@ hostname (the one set with -h <hostname>) directory available
 (mkdir /var/gopher/$HOSTNAME).
 
 
+Compiling with TCP wrappers
+===========================
+
+Gophernicus uses no extra libraries... well... except libwrap
+(TCP wrappers) if it is installed with headers in default Unix
+directories at the time of compiling. If you have the headers
+installed and don't want wrapper support, run 'make generic'
+instead of just 'make', and if you have wrappers installed in
+non-standard place and want to force compile with wrappers
+just run 'make withwrap'.
+
+For configuring IP access lists with TCP wrappers, take a look
+at the files /etc/hosts.allow and /etc/hosts.deny (because the
+manual pages suck). Use the daemon name 'in.gophernicus' to
+make your access lists.
+
+
 Running with traditional inetd superserver
 ==========================================
 
@@ -49,6 +66,9 @@ of "sudo make install" you should just install the deb with
 "dpkg -i ../gophernicus_*.deb" after which It Should Just
 Work(tm).
 
+If you need TCP wrappers support on Debian/Ubuntu, please
+install libwrap0-dev before compiling.
+
 
 Cross-compiling
 ===============

Makefile

@@ -52,19 +52,25 @@ IPCRM   = /usr/bin/ipcrm
 #
 all:
 	@case `uname` in \
-		Darwin)  $(MAKE) ROOT="$(OSXROOT)" DESTDIR="$(OSXDEST)" $(BINARY); ;; \
-		Haiku)   $(MAKE) EXTRA_LDFLAGS="-lnetwork" $(BINARY); ;; \
-		*)       $(MAKE) $(BINARY); ;; \
+		Darwin)	$(MAKE) ROOT="$(OSXROOT)" DESTDIR="$(OSXDEST)" $(BINARY); ;; \
+		Haiku)	$(MAKE) EXTRA_LDFLAGS="-lnetwork" $(BINARY); ;; \
+		*)	if [ -f "/usr/include/tcpd.h" ]; then $(MAKE) withwrap; else $(MAKE) $(BINARY); fi; ;; \
 	esac
 
 generic: $(BINARY)
 
+withwrap:
+	$(MAKE) EXTRA_CFLAGS="-DHAVE_LIBWRAP" EXTRA_LDFLAGS="-lwrap" $(BINARY)
+
 
 #
 # Special targets
 #
 deb: ChangeLog
-	dpkg-buildpackage -rfakeroot -uc -us
+	@echo
+	@echo "Debian package building can haz borken, plz wait some moar..."
+	@echo
+	@#dpkg-buildpackage -rfakeroot -uc -us
 
 ChangeLog:
 	if [ -d .git ]; then \

gophernicus.c

@@ -329,7 +329,7 @@ char *get_local_address(void)
 #endif
 
 	/* Nothing works... I'm out of ideas */
-	return DEFAULT_ADDR;
+	return UNKNOWN_ADDR;
 }
 
 
@@ -374,7 +374,7 @@ char *get_peer_address(void)
 #endif
 
 	/* Nothing works... I'm out of ideas */
-	return DEFAULT_ADDR;
+	return UNKNOWN_ADDR;
 }
 
 
@@ -498,6 +498,13 @@ int main(int argc, char *argv[])
 	/* Open syslog() */
 	if (st.opt_syslog) openlog(self, LOG_PID, LOG_DAEMON);
 
+	/* Check if TCP wrappers have something to say about this connection */
+#ifdef HAVE_LIBWRAP
+	if (sstrncmp(st.req_remote_addr, UNKNOWN_ADDR) != MATCH &&
+	    hosts_ctl(self, STRING_UNKNOWN, st.req_remote_addr, STRING_UNKNOWN) == WRAP_DENIED)
+		die(&st, ERR_ACCESS, "Refused connection");
+#endif
+
 	/* Make sure the computer is turned on */
 #ifdef __HAIKU__
 	if (is_computer_on() != TRUE)

gophernicus.h

@@ -48,6 +48,7 @@
 #define HAVE_POPEN		/* popen() */
 #undef  HAVE_STRLCPY		/* strlcpy() from OpenBSD */
 #undef  HAVE_SENDFILE		/* sendfile() in Linux & others */
+/* #undef  HAVE_LIBWRAP		   autodetected, don't enable here */
 
 /* Linux */
 #ifdef __linux
@@ -130,6 +131,10 @@ size_t strlcpy(char *dst, const char *src, size_t siz);
 size_t strlcat(char *dst, const char *src, size_t siz);
 #endif
 
+#ifdef HAVE_LIBWRAP
+#include <tcpd.h>
+#endif
+
 /*
  * Compile-time configuration
  */
@@ -148,6 +153,8 @@ size_t strlcat(char *dst, const char *src, size_t siz);
 #define ERROR		-1
 
 #define MATCH		0
+#define WRAP_DENIED	0
+
 
 /* Gopher filetypes */
 #define TYPE_TEXT	'0'
@@ -188,11 +195,11 @@ size_t strlcat(char *dst, const char *src, size_t siz);
 #define DEFAULT_TAG	"gophertag"
 #define DEFAULT_CGI	"/cgi-bin/"
 #define DEFAULT_USERDIR	"public_gopher"
-#define DEFAULT_ADDR	"unknown"
 #define DEFAULT_WIDTH	76
 #define DEFAULT_CHARSET	US_ASCII
 #define MIN_WIDTH	33
 #define MAX_WIDTH	200
+#define UNKNOWN_ADDR	"unknown"
 
 /* Session defaults */
 #define DEFAULT_SESSION_TIMEOUT		1800