lipify connects to http://api.ipify.org to query your current IP address. Both IPv4 and IPv6 is supported, for connecting to the ipify server and returning your address.

The library weighs in at 14 kiB. A versioned tarball can be downloaded from GitHub: https://github.com/troglobit/lipify/releases

By default, lipify installs to /usr/local:

make
make install

The default can be changed by setting the prefix= variable at install:

make install prefix=/opt

The DESTDIR= variable is also supported, for the benefit of packagers.

The simplest example of lipify looks like this:

    #include <stdio.h>
    #include <ipify.h>

    int main(void)
    {
            char addr[256];

            if (ipify(addr, sizeof(addr)))
                    return 1;

            printf("%s\n", addr);

            return 0;
    }

You can also get a descriptor, to use with poll() or an event loop library like libuEv, like this:

    #include <ipify.h>

    int main(void)
    {
            int sd;
            char addr[256];

            sd = ipify_connect();
            if (sd < 0)
                    return 1;

            if (!ipify_query(sd, addr, sizeof(addr)))
                    printf("%s\n", addr);

            return ipify_disconnect(sd);
    }

lipify is free software, licensed to you under the very permissive ISC license. See the file LICENSE in the lipify distribution for details.

lipify is written by Joachim Wiberg, post bug reports and pull requests to the project's GitHub repository at https://github.com/troglobit/lipify