Added config.h support & autogeneration.

.svnignore

@@ -1,4 +1,5 @@
 libevent-*
 *.o
+config.h
 tags
 redsocks

Makefile

@@ -1,4 +1,4 @@
-CFLAGS=-std=gnu99 -Wall -g
+CFLAGS=-std=gnu99 -Wall -g -O0
 
 .PHONY: all
 redsocks: parser.o main.o redsocks.o log.o http-connect.o socks4.o socks5.o base.o
@@ -9,11 +9,24 @@ tags: *.c *.h
 
 .PHONY: clean distclean
 clean:
-	rm -f redsocks *.o
+	rm -f redsocks config.h *.o
 
 distclean: clean
 	rm -f tags
 
+base.c: config.h
+
+config.h:
+	case `uname` in \
+		Linux*) \
+		echo "#define USE_IPTABLES" > config.h \
+		;; \
+		*) \
+		echo "Unknown system, only generic firewall code is compiled" 1>&2 \
+		echo "/* Unknown system, only generic firewall code is compiled */" > config.h \
+		;; \
+	esac
+
 %.o: %.c
 	$(CC) $(CFLAGS) -c $*.c -o $*.o
 

base.c

@@ -7,6 +7,11 @@
 #include <string.h>
 #include <pwd.h>
 #include <grp.h>
+#include "config.h"
+#if defined USE_IPTABLES
+# include <limits.h>
+# include <linux/netfilter_ipv4.h>
+#endif
 #include "log.h"
 #include "main.h"
 #include "parser.h"
@@ -149,7 +154,7 @@ static int getdestaddr_pf(int fd, const struct sockaddr_in *client, const struct
 }
 #endif
 
-#ifdef __LINUX__
+#ifdef USE_IPTABLES
 static int getdestaddr_iptables(int fd, const struct sockaddr_in *client, const struct sockaddr_in *bindaddr, struct sockaddr_in *destaddr)
 {
 	socklen_t socklen = sizeof(*destaddr);
@@ -190,7 +195,7 @@ static redirector_subsys redirector_subsystems[] =
 #ifdef __OpenBSD__
 	{ .name = "pf",  .init = redir_init_pf,  .fini = redir_close_private, .getdestaddr = getdestaddr_pf },
 #endif
-#ifdef __LINUX__
+#ifdef USE_IPTABLES
 	{ .name = "iptables", .getdestaddr = getdestaddr_iptables },
 #endif
 	{ .name = "generic",  .getdestaddr = getdestaddr_generic  },