From 0e5b2871ca6456b01d4bf037a6e68badf1ff1a41 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Henryk=20Pl=C3=B6tz?= <henryk@ploetzli.ch>
Date: Fri, 3 Oct 2014 19:58:52 +0200
Subject: Initial commit of djbdns-1.05.tar.gz Source was
 http://cr.yp.to/djbdns/djbdns-1.05.tar.gz, SHA1
 2efdb3a039d0c548f40936aa9cb30829e0ce8c3d

---
 dns_packet.c | 77 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 dns_packet.c

(limited to 'dns_packet.c')

diff --git a/dns_packet.c b/dns_packet.c
new file mode 100644
index 0000000..6d66eeb
--- /dev/null
+++ b/dns_packet.c
@@ -0,0 +1,77 @@
+/*
+DNS should have used LZ77 instead of its own sophomoric compression algorithm.
+*/
+
+#include "error.h"
+#include "dns.h"
+
+unsigned int dns_packet_copy(const char *buf,unsigned int len,unsigned int pos,char *out,unsigned int outlen)
+{
+  while (outlen) {
+    if (pos >= len) { errno = error_proto; return 0; }
+    *out = buf[pos++];
+    ++out; --outlen;
+  }
+  return pos;
+}
+
+unsigned int dns_packet_skipname(const char *buf,unsigned int len,unsigned int pos)
+{
+  unsigned char ch;
+
+  for (;;) {
+    if (pos >= len) break;
+    ch = buf[pos++];
+    if (ch >= 192) return pos + 1;
+    if (ch >= 64) break;
+    if (!ch) return pos;
+    pos += ch;
+  }
+
+  errno = error_proto;
+  return 0;
+}
+
+unsigned int dns_packet_getname(const char *buf,unsigned int len,unsigned int pos,char **d)
+{
+  unsigned int loop = 0;
+  unsigned int state = 0;
+  unsigned int firstcompress = 0;
+  unsigned int where;
+  unsigned char ch;
+  char name[255];
+  unsigned int namelen = 0;
+
+  for (;;) {
+    if (pos >= len) goto PROTO; ch = buf[pos++];
+    if (++loop >= 1000) goto PROTO;
+
+    if (state) {
+      if (namelen + 1 > sizeof name) goto PROTO; name[namelen++] = ch;
+      --state;
+    }
+    else {
+      while (ch >= 192) {
+	where = ch; where -= 192; where <<= 8;
+	if (pos >= len) goto PROTO; ch = buf[pos++];
+	if (!firstcompress) firstcompress = pos;
+	pos = where + ch;
+	if (pos >= len) goto PROTO; ch = buf[pos++];
+	if (++loop >= 1000) goto PROTO;
+      }
+      if (ch >= 64) goto PROTO;
+      if (namelen + 1 > sizeof name) goto PROTO; name[namelen++] = ch;
+      if (!ch) break;
+      state = ch;
+    }
+  }
+
+  if (!dns_domain_copy(d,name)) return 0;
+
+  if (firstcompress) return firstcompress;
+  return pos;
+
+  PROTO:
+  errno = error_proto;
+  return 0;
+}
-- 
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