From 73ede020c76126e81325fcd8d3e186132db21198 Mon Sep 17 00:00:00 2001
From: Jonas Gunz <himself@jonasgunz.de>
Date: Sat, 2 Nov 2019 16:38:44 +0100
Subject: Added fqdn to qname

---
 src/dns.c  | 40 ++++++++++++++++++++++++++++++++++++++++
 src/dns.h  | 17 +++++++++++++++++
 src/main.c | 29 ++++++++++++++++++++++++++++-
 3 files changed, 85 insertions(+), 1 deletion(-)
 create mode 100644 src/dns.c
 create mode 100644 src/dns.h

(limited to 'src')

diff --git a/src/dns.c b/src/dns.c
new file mode 100644
index 0000000..5045e2a
--- /dev/null
+++ b/src/dns.c
@@ -0,0 +1,40 @@
+#include "dns.h"
+
+int fqdn_to_qname( char* _source, int _sourcelen, char* _sink ,int _sinklen )
+{
+	// TODO Opttimize
+	int i = 0;
+	int lastdot = 0;
+
+	if (_sourcelen < 1 || _sinklen < 1)
+		return -1;
+
+	_sink[0] = ' '; //Set to known value
+
+	while ( (i < _sourcelen) && (i < (_sinklen - 1))) { //Copy offset 1
+		if(! _source[i])
+			break;
+		_sink[i+1] = _source[i];
+		i++;
+	}
+
+	if( _source[i] ) // _source not terminated
+		return -1;
+
+	for (int o = 0; o < i; o++) {
+		if( _sink[o] == '.') {
+			_sink[lastdot] = o - lastdot - 1;
+			lastdot = o;
+		}
+	}
+
+	_sink[lastdot] = i - lastdot;
+	_sink[i + 1] = 0;
+
+	return i+2; 
+}
+
+int qname_to_fqdn( char* _source, int _sourcelen, char* _sink, int _sinklen )
+{
+	return -1;
+}
diff --git a/src/dns.h b/src/dns.h
new file mode 100644
index 0000000..9f66367
--- /dev/null
+++ b/src/dns.h
@@ -0,0 +1,17 @@
+#pragma once
+
+#include <stdint.h>
+
+/**
+ * Convert a null terminated string containing a 
+ * fqdn (eg server.example.com) to the binary format used by DNS records
+ * ( [6]server[7]example[3]com[0] )
+ * returns: length of string in _sink, < 0 on failure
+ * _sink might not be terminated on error.
+ * */
+int fqdn_to_qname( char* _source, int _sourcelen, char* _sink, int _sinklen );
+
+/**
+ * Opposite of fqdn_to_qname()
+ * */
+int qname_to_fqdn( char* _source, int _sourcelen, char* _sink, int _sinklen );
diff --git a/src/main.c b/src/main.c
index 1dcd0f4..120637d 100644
--- a/src/main.c
+++ b/src/main.c
@@ -28,8 +28,35 @@ void signal_term ( );
 
 void signal_term_child ( );
 
+int test_main(	int argc,
+		char* argv[] )
+{
+	printf("TEST MODE. NOT FUNCTIONAL\n");
+
+	char in[128];
+	char out[128];
+
+	strncpy ( in, "www.example.com\0", 127);
+
+	printf("%s\n", in);
+
+	int written = fqdn_to_qname (in,128,out,128);
+
+	if (written < 0) {
+		printf("invallid fqdn\n");
+		return 1;
+	}
+
+	for(int i = 0; i < written; i++)
+		printf(" %x ", out[i]);
+
+	printf("\n\n");
+	return 0;
+}
+
 int main(	int argc,
-		char* argv[] ) {
+		char* argv[] )
+{
 	int 		ret;
        	struct		sockaddr_in sock_server_addr;
 	
-- 
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