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_find_authority.c | 46 +++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 src/server/shibari_tdb_find_authority.c

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

diff --git a/src/server/shibari_tdb_find_authority.c b/src/server/shibari_tdb_find_authority.c
new file mode 100644
index 0000000..5550f52
--- /dev/null
+++ b/src/server/shibari_tdb_find_authority.c
@@ -0,0 +1,46 @@
+/* ISC license. */
+
+#include <stdint.h>
+
+#include <skalibs/cdb.h>
+
+#include <shibari/constants.h>
+#include <shibari/tdb.h>
+
+static int find_ns_and_soa (cdb const *tdb, char const *s, uint16_t len, char const *loc, tain const *stamp)
+{
+  cdb_find_state state = CDB_FIND_STATE_ZERO ;
+  unsigned int flags = 0 ;
+  for (;;)
+  {
+    shibari_tdb_entry entry ;
+    cdb_data data ;
+    int r = cdb_findnext(tdb, &data, s, len, &state) ;
+    if (r == -1) return -1 ;
+    if (!r) break ;
+    r = shibari_tdb_entry_parse(&entry, data.s, data.len, SHIBARI_T_ANY, 0, loc, stamp) ;
+    if (r == -1) return -1 ;
+    if (!r) continue ;
+    if (entry.type == SHIBARI_T_SOA) flags |= 1 ;
+    else if (entry.type == SHIBARI_T_NS) flags |= 2 ;
+  }
+  return flags ;
+}
+
+int shibari_tdb_find_authority (cdb const *tdb, char const *s, uint16_t len, char const *loc, tain const *stamp, int *npl)
+{
+  uint16_t pos = 0 ;
+  uint16_t zplen = 0 ;
+  int nplen = -1 ;
+  while (pos < len)
+  {
+    int flags = find_ns_and_soa(tdb, s + pos, len - pos, loc, stamp) ;
+    if (flags == -1) return -1 ;
+    if (flags & 2) nplen = pos ;
+    if (flags & 1) { zplen = pos ; break ; }
+    pos += 1 + (uint8_t)s[pos] ;
+  }
+  if (pos >= len) return -2 ;  /* out of bailiwick */
+  *npl = nplen ;
+  return zplen ;
+}
-- 
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