How do I get my IP address in C on Linux?

Question

How could I get my IP address (preferably in 192.168.0.1 format)?

See previous [question](http://stackoverflow.com/questions/212528/get-the-ip-address-of-the-machine) — Louis Hugues, Dec 27 '13 at 12:00
look here: http://stackoverflow.com/questions/2283494/get-ip-address-of-an-interface-on-linux — Soosh, Dec 27 '13 at 12:03
`const char* my_address = "127.0.0.1";` works most of the time. — n. m. could be an AI, Dec 27 '13 at 12:38

score 15 · Accepted Answer · answered Dec 27 '13 at 14:58

This example code lists both the interface name (e.g. lo or eth0) together with the currently assigned IP address, for all the IPv4 network interfaces that exist on your computer:

getifaddrs(&addrs);
tmp = addrs;

while (tmp) 
{
    if (tmp->ifa_addr && tmp->ifa_addr->sa_family == AF_INET)
    {
        struct sockaddr_in *pAddr = (struct sockaddr_in *)tmp->ifa_addr;
        printf("%s: %s\n", tmp->ifa_name, inet_ntoa(pAddr->sin_addr));
    }

    tmp = tmp->ifa_next;
}

freeifaddrs(addrs);

uClibc does not contain getifaddrs until very crecently. Do you know any other method which could be used on embedded devices? — Marki555, Dec 29 '14 at 00:44

score 7 · Answer 2 · answered Dec 27 '13 at 12:07

7

For Linux:

To get all interfaces local to the machine use getifaddrs().

There is an example at the end of the page linked above.

answered Dec 27 '13 at 12:07

alk

69,737
10
105
255

How do I get my IP address in C on Linux?

2 Answers2

Linked

Related