C Program to Display the IP Address of the System

August 14, 2016

C Program to Display the IP Address of the System.

```
#include <stdio.h>
```
```
#include <string.h>
```
```
#include <sys/types.h>
```
```
#include <sys/socket.h>
```
```
#include <sys/ioctl.h>
```
```
#include <netinet/in.h>
```
```
#include <net/if.h>
```
```
#include <unistd.h>
```
```
#include <arpa/inet.h>
```
```
 
```
```
int main()
```
```
{
```
```
    int n;
```
```
    struct ifreq ifr;
```
```
    char array[] = "eth0";
```
```
 
```
```
    n = socket(AF_INET, SOCK_DGRAM, 0);
```

    //Type of address to retrieve - IPv4 IP address

```
    ifr.ifr_addr.sa_family = AF_INET;
```

    //Copy the interface name in the ifreq structure

    strncpy(ifr.ifr_name , array , IFNAMSIZ - 1);

```
    ioctl(n, SIOCGIFADDR, &ifr);
```
```
    close(n);
```
```
    //display result
```

    printf("IP Address is %s - %s\n" , array , inet_ntoa(( (struct sockaddr_in *)&ifr.ifr_addr )->sin_addr) );

```
    return 0;
```
```
}
```

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