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authorJannis Hoffmann <jannis@fehcom.de>2024-07-09 13:02:45 +0200
committerJannis Hoffmann <jannis@fehcom.de>2024-07-09 13:02:45 +0200
commit96cf8dffe4f7b0b910f790066ae622dc429eb522 (patch)
treecc1343a0ac92bb4836cae2dd63a97fa045765e7f /dnsstub/dns_nd.c
initial commit of version 23fehQlibs-23
Diffstat (limited to 'dnsstub/dns_nd.c')
-rw-r--r--dnsstub/dns_nd.c48
1 files changed, 48 insertions, 0 deletions
diff --git a/dnsstub/dns_nd.c b/dnsstub/dns_nd.c
new file mode 100644
index 0000000..6ce8ed9
--- /dev/null
+++ b/dnsstub/dns_nd.c
@@ -0,0 +1,48 @@
+#include "byte.h"
+#include "fmt.h"
+#include "ip.h"
+#include "dnsresolv.h"
+
+/**
+ @file dns_nd.c
+ @autor djb, fefe
+ @source ucspi-tcp
+ @brief DNS domain name for ip (wire format)
+*/
+
+int dns_name4_domain(char name[DNS_NAME4_DOMAIN],const char ip[4])
+{
+ unsigned int namelen;
+ unsigned int i;
+
+ namelen = 0;
+ i = fmt_ulong(name + namelen + 1,(unsigned long) (unsigned char) ip[3]);
+ name[namelen++] = i;
+ namelen += i;
+ i = fmt_ulong(name + namelen + 1,(unsigned long) (unsigned char) ip[2]);
+ name[namelen++] = i;
+ namelen += i;
+ i = fmt_ulong(name + namelen + 1,(unsigned long) (unsigned char) ip[1]);
+ name[namelen++] = i;
+ namelen += i;
+ i = fmt_ulong(name + namelen + 1,(unsigned long) (unsigned char) ip[0]);
+ name[namelen++] = i;
+ namelen += i;
+ byte_copy(name + namelen,14,"\7in-addr\4arpa\0");
+ return namelen+14;
+}
+
+int dns_name6_domain(char name[DNS_NAME6_DOMAIN],const char ip[16])
+{
+ unsigned int j;
+
+ for (j = 0; j < 16; j++) {
+ name[j * 4] = 1;
+ name[j * 4 + 1] = tohex(ip[15 - j] & 15);
+ name[j * 4 + 2] = 1;
+ name[j * 4 + 3] = tohex((unsigned char)ip[15 - j] >> 4);
+ }
+ byte_copy(name + 4 * 16,10,"\3ip6\4arpa\0");
+ return 4 * 16 + 10;
+}
+