c++ - Getting hostname aliases from IP -


i want list of aliases hostname in c++. input ip. call gethostbyaddr(), returns hostent struct. struct has field list of aliases.

     struct  hostent {         char    far * h_name;           /* official name of host */         char    far * far * h_aliases;  /* alias list */         short   h_addrtype;             /* host address type */         short   h_length;               /* length of address */         char    far * far * h_addr_list; /* list of addresses */ };

gethostbyaddr() api legacy, , wanted support ipv6 inputs. replaced gethostbyaddr() getnameinfo() recommended in msdn. after changes, there no way list of aliases hostname. getnameinfo() returns hostname string, , there no alias list returned it. can me alias list in case?

i don't think that's possible. dns stores:

  • for each name, 1 or many ip/ipv6 addresses;
  • for each ip/ipv6 address, 1 "canonical" name.

so can query addresses associated name (getaddrinfo), or canonical name associated address (getaddrinfo), there's no way query set of names map given address.


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