1 files changed, 37 insertions, 0 deletions
diff --git a/src/dnsptr.c b/src/dnsptr.c
new file mode 100644
index 0000000..25a4731
--- /dev/null
+++ b/src/dnsptr.c
@@ -0,0 +1,37 @@
+#include <unistd.h>
+#include "buffer.h"
+#include "stralloc.h"
+#include "str.h"
+#include "dnsresolv.h"
+#include "dns.h"
+#include "ip.h"
+#include "exit.h"
+#include "logmsg.h"
+
+#define WHO "dnsptr"
+
+stralloc out = {0};
+char ip4[4];
+char ip6[16];
+ 
+int main(int argc,char **argv)
+{
+  if (!argv[1])
+    logmsg(WHO,100,USAGE,"dnsptr ipv4 || ipv6 (compactified)");
+
+  DNS_INIT
+  if (str_chr(argv[1],':') < str_len(argv[1])) {
+    if (!ip6_scan(argv[1],ip6))
+      logmsg(WHO,111,FATAL,"wrong IPv6 format");
+    if (dns_name6(&out,ip6) > 0)
+      buffer_put(buffer_1,out.s,out.len);
+  } else {
+    if (!ip4_scan(argv[1],ip4))
+      logmsg(WHO,111,FATAL,"wrong IPv4 format");
+    if (dns_name4(&out,ip4) > 0)
+      buffer_put(buffer_1,out.s,out.len);
+  }
+  buffer_putsflush(buffer_1,"\n");
+
+  _exit(0);
+}