From b8d0f83e6cea9640a7ee4402c163ad812237355d Mon Sep 17 00:00:00 2001
From: Laurent Bercot <ska-skaware@skarnet.org>
Date: Sun, 10 Dec 2023 11:48:01 +0000
Subject:  Initial commit

Signed-off-by: Laurent Bercot <ska@appnovation.com>
---
 src/server/shibari_tdb_entry_parse.c | 56 ++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 src/server/shibari_tdb_entry_parse.c

(limited to 'src/server/shibari_tdb_entry_parse.c')

diff --git a/src/server/shibari_tdb_entry_parse.c b/src/server/shibari_tdb_entry_parse.c
new file mode 100644
index 0000000..61f076f
--- /dev/null
+++ b/src/server/shibari_tdb_entry_parse.c
@@ -0,0 +1,56 @@
+/* ISC license. */
+
+#include <stdint.h>
+
+#include <skalibs/uint16.h>
+#include <skalibs/uint32.h>
+#include <skalibs/tai.h>
+
+#include <shibari/constants.h>
+#include <shibari/tdb.h>
+
+int shibari_tdb_entry_parse (shibari_tdb_entry *out, char const *s, uint16_t len, uint16_t qtype, unsigned int wild, char const *loc, tain const *stamp)
+{
+  tai ttd ;
+  uint32_t ttl ;
+  uint32_t flags = 0 ;
+  uint16_t type ;
+  if (len < 15) return -1 ;
+  uint16_unpack_big(s, &type) ;
+  if (qtype != SHIBARI_T_ANY && qtype != type && type != SHIBARI_T_CNAME) return 0 ;
+  s += 3 ; len -= 3 ;
+  switch (s[-1])
+  {
+    case '+' : flags |= 1 ;
+    case '>' :
+      if (len < 14) return -1 ;
+      if (loc && loc[0] && (loc[0] != s[0] || loc[1] != s[1])) return 0 ;
+      s += 2 ; len -= 2 ;
+      break ;
+    case '*' : flags |= 1 ;
+    case '=' : break ;
+    default : return -1 ;
+  }
+  if (wild < 2 && wild != (flags & 1)) return 0 ;
+  uint32_unpack_big(s, &ttl) ;
+  s += 4 ; len -= 4 ;
+  tai_unpack(s, &ttd) ;
+  s += 8 ; len -= 8 ;
+  if (tai_sec(&ttd))
+  {
+    if (!ttl == !tai_less(tain_secp(stamp), &ttd)) return 0 ;
+    if (!ttl)
+    {
+      tai t ;
+      tai_sub(&t, &ttd, tain_secp(stamp)) ;
+      if (tai_sec(&t) < 2) ttl = 2 ;
+      else if (tai_sec(&t) > 3600 && qtype != SHIBARI_T_ANY) ttl = 3600 ;
+    }
+  }
+  out->ttl = ttl ;
+  out->flags = flags ;
+  out->type = type ;
+  out->data.s = s ;
+  out->data.len = len ;
+  return 1 ;
+}
-- 
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