How To Finding A Machine Address

  • 15 Feb, 2012

    Finding an address that can be used to connect to a remote machine is done with either of the following commands:#include <netdb.h>struct hostent *gethostbyname(char *name)struct hostent *gethostbyaddr(char *addr, int len, int type)name contains the host name for which the IP address is needed. addr points to a structure of type in_addr and len is the size in bytes of this structure. In this discussion type is always AF_INET since the discussion is limited to use of IP addresses on the Internet.Both calls return a pointer to a host entry structure.This structure has the following form:struct hostent {char *h_name; /*official name of host*/char **h_aliases; /* alias list */int h_addrtype; /* address type */int h_length; /* length of address */char **h_addr_list;/* list of addresses from name server */ #define h_addr h_addr_list[0]/* address for backward compatibility */ };

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