1 files changed, 75 insertions, 0 deletions
diff --git a/src/clients/s6-dnssrv.c b/src/clients/s6-dnssrv.c
new file mode 100644
index 0000000..283f1cd
--- /dev/null
+++ b/src/clients/s6-dnssrv.c
@@ -0,0 +1,75 @@
+/* ISC license. */
+
+#include <errno.h>
+#include <skalibs/uint.h>
+#include <skalibs/bytestr.h>
+#include <skalibs/sgetopt.h>
+#include <skalibs/strerr2.h>
+#include <skalibs/buffer.h>
+#include <skalibs/tai.h>
+#include <skalibs/genalloc.h>
+#include <skalibs/random.h>
+#include <s6-dns/s6dns.h>
+
+#define USAGE "s6-dnssrv [ -q ] [ -r ] [ -t timeout ] service protocol name"
+#define dieusage() strerr_dieusage(100, USAGE)
+
+int main (int argc, char const *const *argv)
+{
+  genalloc srvs = GENALLOC_ZERO ; /* array of s6dns_message_rr_srv_t */
+  tain_t deadline ;
+  unsigned int i = 0 ;
+  int flagqualify = 0 ;
+  int flagunsort = 0 ;
+  PROG = "s6-dnssrv" ;
+  for (;;)
+  {
+    register int opt = subgetopt(argc, argv, "qt:") ;
+    if (opt == -1) break ;
+    switch (opt)
+    {
+      case 'q' : flagqualify = 1 ; break ;
+      case 'r' : flagunsort = 1 ; break ;
+      case 't' : if (!uint0_scan(subgetopt_here.arg, &i)) dieusage() ; break ;
+      default : dieusage() ;
+    }
+  }
+  argc -= subgetopt_here.ind ; argv += subgetopt_here.ind ;
+  if (argc < 3) dieusage() ;
+
+  tain_now_g() ;
+  if (i) tain_from_millisecs(&deadline, i) ; else deadline = tain_infinite_relative ;
+  tain_add_g(&deadline, &deadline) ;
+  if (!s6dns_init()) strerr_diefu1sys(111, "s6dns_init") ;
+  {
+    unsigned int n0 = str_len(argv[0]) ;
+    unsigned int n1 = str_len(argv[1]) ;
+    unsigned int n2 = str_len(argv[2]) ;
+    char name[n0 + n1 + n2 + 5] ;
+    name[0] = '_' ;
+    byte_copy(name + 1, n0, argv[0]) ;
+    name[n0 + 1] = '.' ;
+    name[n0 + 2] = '_' ;
+    byte_copy(name + n0 + 3, n1, argv[1]) ;
+    name[n0 + n1 + 3] = '.' ;
+    byte_copy(name + n0 + n1 + 4, n2, argv[2]) ;
+    name[n0 + n1 + n2 + 4] = 0 ;
+    register int r = s6dns_resolve_srv_g(&srvs, name, n0 + n1 + n2 + 4, flagqualify, &deadline) ;
+    if (r < 0) strerr_diefu2sys((errno == ETIMEDOUT) ? 99 : 111, "resolve ", argv[0]) ;
+    if (!r) strerr_diefu4x(2, "resolve ", name, ": ", s6dns_constants_error_str(errno)) ;
+  }
+  if (!genalloc_len(s6dns_message_rr_srv_t, &srvs)) return 1 ;
+  if (flagunsort) random_unsort(srvs.s, genalloc_len(s6dns_message_rr_srv_t, &srvs), sizeof(s6dns_message_rr_srv_t)) ;
+  for (i = 0 ; i < genalloc_len(s6dns_message_rr_srv_t, &srvs) ; i++)
+  {
+    char buf[S6DNS_FMT_SRV] ;
+    register unsigned int len = s6dns_fmt_srv(buf, S6DNS_FMT_SRV, genalloc_s(s6dns_message_rr_srv_t, &srvs) + i) ;
+    if (!len) strerr_diefu1sys(111, "format result") ;
+    if (buffer_put(buffer_1, buf, len) < 0) goto err ;
+    if (buffer_put(buffer_1, "\n", 1) < 0) goto err ;
+  }
+  if (!buffer_flush(buffer_1)) goto err ;
+  return 0 ;
+ err:
+  strerr_diefu1sys(111, "write to stdout") ;
+}