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How to get the IP Address of local computer using C/C++?
In this section we will see how to see the Host name and IP address of the local system in an easier way. We will write a C program to find the host name and IP.
Some of the following functions are used. These functions have different task. Let us see the functions and their tasks.
Sr.No | Function & Description |
---|---|
1 | gethostname() It finds the standard host name for the local computer. |
2 | gethostbyname() It finds the host information corresponding to a host name from host database |
3 | iten_ntoa() It converts an IPv4 Internet network address into an ASCII string into dotted decimal format. |
Example
#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> void check_host_name(int hostname) { //This function returns host name for local computer if (hostname == -1) { perror("gethostname"); exit(1); } } void check_host_entry(struct hostent * hostentry) { //find host info from host name if (hostentry == NULL){ perror("gethostbyname"); exit(1); } } void IP_formatter(char *IPbuffer) { //convert IP string to dotted decimal format if (NULL == IPbuffer) { perror("inet_ntoa"); exit(1); } } main() { char host[256]; char *IP; struct hostent *host_entry; int hostname; hostname = gethostname(host, sizeof(host)); //find the host name check_host_name(hostname); host_entry = gethostbyname(host); //find host information check_host_entry(host_entry); IP = inet_ntoa(*((struct in_addr*) host_entry->h_addr_list[0])); //Convert into IP string printf("Current Host Name: %s\n", host); printf("Host IP: %s\n", IP); }
Output
Current Host Name: soumyadeep-VirtualBox Host IP: 127.0.1.1
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