Add CAA record support

1 files changed, 22 insertions, 0 deletions

diff --git a/src/libs6dns/s6dns_fmt_caa.c b/src/libs6dns/s6dns_fmt_caa.c
new file mode 100644
index 0000000..7fbf36b
--- /dev/null
+++ b/src/libs6dns/s6dns_fmt_caa.c
@@ -0,0 +1,22 @@
+/* ISC license. */
+
+#include <stdint.h>
+#include <string.h>
+#include <errno.h>
+#include <skalibs/uint16.h>
+#include <s6-dns/s6dns-fmt.h>
+
+size_t s6dns_fmt_caa (char *s, size_t max, s6dns_message_rr_caa_t const *caa)
+{
+  size_t len = 0, taglen = strlen(caa->tag), valuelen = strlen(caa->value) ;
+  char fmt[UINT16_FMT] ;
+  size_t r = uint16_fmt(fmt, (uint16_t)caa->flags) ;
+  if (r + taglen + valuelen + 2 > max) return (errno = ENAMETOOLONG, 0) ;
+  memcpy(s + len, fmt, r) ;
+  len += r ; s[len++] = ' ' ;
+  memcpy(s + len, caa->tag, taglen) ;
+  len += taglen ; s[len++] = ' ' ;
+  memcpy(s + len, caa->value, valuelen) ;
+  len += valuelen ;
+  return len ;
+}