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print ip address and hostname.c
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print ip address and hostname.c
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// C program to display hostname
// and IP address
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
// Returns hostname for the local computer
void checkHostName(int hostname)
{
if (hostname == -1)
{
perror("gethostname");
exit(1);
}
}
// Returns host information corresponding to host name
void checkHostEntry(struct hostent * hostentry)
{
if (hostentry == NULL)
{
perror("gethostbyname");
exit(1);
}
}
// Converts space-delimited IPv4 addresses
// to dotted-decimal format
void checkIPbuffer(char *IPbuffer)
{
if (NULL == IPbuffer)
{
perror("inet_ntoa");
exit(1);
}
}
// Driver code
int main()
{
char hostbuffer[256];
char *IPbuffer;
struct hostent *host_entry;
int hostname;
// To retrieve hostname
hostname = gethostname(hostbuffer, sizeof(hostbuffer));
checkHostName(hostname);
// To retrieve host information
host_entry = gethostbyname(hostbuffer);
checkHostEntry(host_entry);
// To convert an Internet network
// address into ASCII string
IPbuffer = inet_ntoa(*((struct in_addr*)
host_entry->h_addr_list[0]));
printf("Hostname: %s\n", hostbuffer);
printf("Host IP: %s", IPbuffer);
return 0;
}