clean: remove dns lookup

src/dns.c

@@ -32,19 +32,3 @@ int dns_lookup(struct hostenv *host)
 
     return 0;
 }
-
-int dns_reverse_lookup(struct hostenv *host)
-{
-    int ret = getnameinfo(
-        (struct sockaddr *)&host->ip, sizeof(host->ip),
-        host->reverse_dns, sizeof(host->reverse_dns),
-        NULL, 0, NI_NAMEREQD);
-
-    if (ret != 0) 
-    {
-        print_err("reverse dns failed.");
-        return 1;
-    }
-
-    return 0;
-}

src/dns.h

@@ -3,4 +3,3 @@
 #include "host.h"
 
 int dns_lookup(struct hostenv *host);
-int dns_reverse_lookup(struct hostenv *host);

src/host.h

@@ -7,5 +7,4 @@ struct hostenv {
     char ipstr[INET_ADDRSTRLEN];
     struct sockaddr_in ip;
     char *hostname;
-    char reverse_dns[NI_MAXHOST];
 };