Add -t u option to ahost

Add an option to allow specification of the AF_UNSPEC
address family.

ahost.1

@@ -23,6 +23,7 @@ Display this help and exit.
 \fB\-t\fR type
 If type is "a", print the A record (default).
 If type is "aaaa", print the AAAA record.
+If type is "u", look for either AAAA or A record (in that order).
 .TP
 \fB\-s\fR \fIdomain\fP
 Specify the \fIdomain\fP to search instead of using the default values from

ahost.c

@@ -96,6 +96,8 @@ int main(int argc, char **argv)
             addr_family = AF_INET;
           else if (!strcasecmp(optarg,"aaaa"))
             addr_family = AF_INET6;
+          else if (!strcasecmp(optarg,"u"))
+            addr_family = AF_UNSPEC;
           else
             usage();
           break;
@@ -195,6 +197,6 @@ static void callback(void *arg, int status, int timeouts, struct hostent *host)
 
 static void usage(void)
 {
-  fprintf(stderr, "usage: ahost [-t {a|aaaa}] {host|addr} ...\n");
+  fprintf(stderr, "usage: ahost [-t {a|aaaa|u}] {host|addr} ...\n");
   exit(1);
 }