1 files changed, 38 insertions, 0 deletions
diff --git a/src/libs6/s6_accessrules_backend_cdb.c b/src/libs6/s6_accessrules_backend_cdb.c
new file mode 100644
index 0000000..fc564bb
--- /dev/null
+++ b/src/libs6/s6_accessrules_backend_cdb.c
@@ -0,0 +1,38 @@
+/* ISC license. */
+
+#include <unistd.h>
+#include <errno.h>
+#include <skalibs/bytestr.h>
+#include <skalibs/uint16.h>
+#include <skalibs/cdb.h>
+#include <skalibs/stralloc.h>
+#include <s6/accessrules.h>
+
+s6_accessrules_result_t s6_accessrules_backend_cdb (char const *key, unsigned int keylen, void *data, s6_accessrules_params_t *params)
+{
+  struct cdb *c = data ;
+  unsigned int execbase, n ;
+  uint16 envlen, execlen ;
+  register int r = cdb_find(c, key, keylen) ;
+  if (r < 0) return S6_ACCESSRULES_ERROR ;
+  else if (!r) return S6_ACCESSRULES_NOTFOUND ;
+  n = cdb_datalen(c) ;
+  if ((n < 5U) || (n > 8197U)) return (errno = EINVAL, S6_ACCESSRULES_ERROR) ;
+  if (!stralloc_readyplus(&params->exec, n)) return S6_ACCESSRULES_ERROR ;
+  execbase = params->exec.len ;
+  if (cdb_read(c, params->exec.s + execbase, n, cdb_datapos(c)) < 0) return S6_ACCESSRULES_ERROR ;
+  if (params->exec.s[execbase] == 'D') return S6_ACCESSRULES_DENY ;
+  else if (params->exec.s[execbase] != 'A') return S6_ACCESSRULES_NOTFOUND ;
+  uint16_unpack_big(params->exec.s + execbase + 1U, &envlen) ;
+  if ((envlen > 4096U) || (envlen+5U > n)) return (errno = EINVAL, S6_ACCESSRULES_ERROR) ;
+  uint16_unpack_big(params->exec.s + execbase + 3 + envlen, &execlen) ;
+  if ((execlen > 4096U) || (5U + envlen + execlen != n)) return (errno = EINVAL, S6_ACCESSRULES_ERROR) ;
+  if (!stralloc_catb(&params->env, params->exec.s + execbase + 3U, envlen)) return S6_ACCESSRULES_ERROR ;
+  byte_copy(params->exec.s + execbase, execlen, params->exec.s + execbase + 5U + envlen) ;
+  if (execlen)
+  {
+    params->exec.len += execlen ;
+    params->exec.s[params->exec.len++] = 0 ;
+  }
+  return S6_ACCESSRULES_ALLOW ;
+}