Add s6dns_hosts reading functions

Signed-off-by: Laurent Bercot <ska@appnovation.com>

1 files changed, 36 insertions, 0 deletions

diff --git a/src/libs6dns/s6dns_hosts_ip_string.c b/src/libs6dns/s6dns_hosts_ip_string.c
new file mode 100644
index 0000000..430f7d3
--- /dev/null
+++ b/src/libs6dns/s6dns_hosts_ip_string.c
@@ -0,0 +1,36 @@
+/* ISC license. */
+
+#include <errno.h>
+#include <string.h>
+
+#include <skalibs/cdb.h>
+#include <skalibs/stralloc.h>
+
+#include <s6-dns/s6dns-domain.h>
+#include <s6-dns/hosts.h>
+
+#include <skalibs/posixishard.h>
+
+extern int s6dns_hosts_ip_string_r (cdb const *c, char const *name, stralloc *sa, unsigned int flags)
+{
+  s6dns_domain_t d ;
+  int r ;
+  cdb_data data ;
+  if (!c->map) return 0 ;
+  if (!s6dns_domain_fromstring(&d, name, strlen(name))
+   || !s6dns_domain_noqualify(&d)) return -1 ;
+
+  {
+    char tmp[3 + d.len] ;
+    tmp[0] = flags & 2 ? 'u' : 'a' ;
+    tmp[1] = flags & 1 ? '6' : '4' ;
+    tmp[2] = ':' ;
+    memcpy(tmp + 3, d.s, d.len) ;
+    r = cdb_find(c, &data, tmp, 3 + d.len) ;
+  }
+  if (r <= 0) return r ;
+  if (!data.len) return 0 ;
+  if (data.len & (flags & 1 ? 15 : 3)) return (errno = EPROTO, -1) ;
+  if (!stralloc_catb(sa, data.s, data.len)) return -1 ;
+  return data.len >> (flags & 1 ? 4 : 2) ;
+}