pull a function I will need for service-dns out of pretty-print

1 files changed, 25 insertions, 0 deletions

diff --git a/src/vpn/gnunet-dns-parser.c b/src/vpn/gnunet-dns-parser.c
new file mode 100644
index 000000000..3425e78f6
--- /dev/null
+++ b/src/vpn/gnunet-dns-parser.c
@@ -0,0 +1,25 @@
+#include "platform.h"
+#include "gnunet-dns-parser.h"
+
+unsigned int parse_dns_name(unsigned char* d, const unsigned char* src, unsigned short idx) {/*{{{*/
+        unsigned char* dest = d;
+
+        int len = src[idx++];
+        while (len != 0) {
+                if (len & 0xC0) { /* Compressed name, offset in this and the next octet */
+                        unsigned short offset = ((len & 0x3F) << 8) | src[idx++];
+                        parse_dns_name(dest, src, offset - 12); /* 12 for the Header of the DNS-Packet, idx starts at 0 which is 12 bytes from the start of the packet */
+                        return idx;
+                }
+                memcpy(dest, src+idx, len);
+                idx += len;
+                dest += len;
+                *dest = '.';
+                dest++;
+                len = src[idx++];
+        };
+        *dest = 0;
+
+        return idx;
+}
+/*}}}*/