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<span style="font-size: 10pt"><a href="/plan9/">Plan 9 from Bell Labs</a>&rsquo;s /usr/web/sources/contrib/rsc/dyndns.c</span></p>
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Copyright © 2009 Alcatel-Lucent.<br />
Distributed under the
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<a href="/plan9/download.html">Download the Plan 9 distribution.</a>
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#include &lt;u.h&gt;
#include &lt;libc.h&gt;
#include &lt;libsec.h&gt;
#include &lt;auth.h&gt;
#include &lt;thread.h&gt;

void
usage(void)
{
       fprint(2, "usage: dyndns [-k keyspec] [-s server] host [ip]\n");
       threadexitsall("usage");
}

void
threadmain(int argc, char **argv)
{
       char buf[100], *auth, *keyspec, *server;
       int n, fd;
       UserPasswd *up;

       fmtinstall('[', encodefmt);
       keyspec = "";
       server = "members.dyndns.org";
       ARGBEGIN{
       case 's':
               server = EARGF(usage());
               break;
       case 'k':
               keyspec = EARGF(usage());
               break;
       default:
               usage();
       }ARGEND

       if(argc &lt; 1 || argc &gt; 2)
               usage();

       if((up = auth_getuserpasswd(auth_getkey, "proto=pass role=client service=dyndns server=%s %s", server, keyspec)) == nil)
               sysfatal("cannot get password: %r");
       auth = smprint("%s:%s", up-&gt;user, up-&gt;passwd);

       server = netmkaddr(server, "net", "http");
       if((fd = dial(server, nil, nil, nil)) &lt; 0)
               sysfatal("dial %s: %r", server);

       fprint(fd, "GET /nic/update?hostname=%s&amp;myip=%s HTTP/1.0\r\n"
               "Host: %s\r\n"
               "Authorization: Basic %.*[\r\n"
               "User-Agent: stupid\r\n"
               "\r\n", argv[0], argc==2 ? argv[1] : "", server, strlen(auth), auth);

       while((n = read(fd, buf, sizeof buf)) &gt; 0)
               write(1, buf, n);
       threadexitsall(0);
}
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