123 lines
2.4 KiB
HTML
123 lines
2.4 KiB
HTML
Content-type: text/html
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<HTML><HEAD><TITLE>Manpage of IPSEC_GOODMASK</TITLE>
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</HEAD><BODY>
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<H1>IPSEC_GOODMASK</H1>
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Section: C Library Functions (3)<BR>Updated: 11 June 2001<BR><A HREF="#index">Index</A>
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<A HREF="http://localhost/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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ipsec goodmask - is this Internet subnet mask a valid one?
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<BR>
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ipsec masktobits - convert Internet subnet mask to bit count
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<BR>
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ipsec bitstomask - convert bit count to Internet subnet mask
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<B>#include <<A HREF="file:/usr/include/freeswan.h">freeswan.h</A>></B>
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<P>
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<B>int goodmask(struct in_addr mask);</B>
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<BR>
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<B>int masktobits(struct in_addr mask);</B>
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<BR>
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<B>struct in_addr bitstomask(int n);</B>
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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These functions are obsolete;
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see
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<I><A HREF="ipsec_masktocount.3.html">ipsec_masktocount</A></I>(3)
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for a partial replacement.
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<P>
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<I>Goodmask</I>
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reports whether the subnet
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<I>mask</I>
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is a valid one,
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i.e. consists of a (possibly empty) sequence of
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<B>1</B>s
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followed by a (possibly empty) sequence of
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<B>0</B>s.
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<I>Masktobits</I>
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takes a (valid) subnet mask and returns the number of
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<B>1</B>
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bits in it.
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<I>Bitstomask</I>
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reverses this,
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returning the subnet mask corresponding to bit count
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<I>n</I>.
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<P>
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All masks are in network byte order.
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<A NAME="lbAE"> </A>
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<H2>SEE ALSO</H2>
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<A HREF="inet.3.html">inet</A>(3), <A HREF="ipsec_atosubnet.3.html">ipsec_atosubnet</A>(3)
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<A NAME="lbAF"> </A>
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<H2>DIAGNOSTICS</H2>
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<I>Masktobits</I>
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returns
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<B>-1</B>
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for an invalid mask.
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<I>Bitstomask</I>
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returns an all-zeros mask for a negative or out-of-range
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<I>n</I>.
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<A NAME="lbAG"> </A>
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<H2>HISTORY</H2>
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Written for the FreeS/WAN project by Henry Spencer.
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<A NAME="lbAH"> </A>
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<H2>BUGS</H2>
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The error-reporting convention of
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<I>bitstomask</I>
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is less than ideal;
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zero is sometimes a legitimate mask.
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT><A HREF="#lbAB">NAME</A><DD>
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<DT><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT><A HREF="#lbAE">SEE ALSO</A><DD>
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<DT><A HREF="#lbAF">DIAGNOSTICS</A><DD>
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<DT><A HREF="#lbAG">HISTORY</A><DD>
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<DT><A HREF="#lbAH">BUGS</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="http://localhost/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 21:40:17 GMT, November 11, 2003
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</BODY>
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</HTML>
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