Socket Programming Question:
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How to finding a Machine Address?
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Answer:
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 */
};
#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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