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Content-type: text/html
<HTML><HEAD><TITLE>Manpage of IPSEC_ATOASR</TITLE>
</HEAD><BODY>
<H1>IPSEC_ATOASR</H1>
Section: C Library Functions (3)<BR>Updated: 11 June 2001<BR><A HREF="#index">Index</A>
<A HREF="http://localhost/cgi-bin/man/man2html">Return to Main Contents</A><HR>
<A NAME="lbAB"> </A>
<H2>NAME</H2>
ipsec atoasr - convert ASCII to Internet address, subnet, or range
<BR>
ipsec rangetoa - convert Internet address range to ASCII
<A NAME="lbAC"> </A>
<H2>SYNOPSIS</H2>
<B>#include <<A HREF="file:/usr/include/freeswan.h">freeswan.h</A>></B>
<P>
<B>const char *atoasr(const char *src, size_t srclen,</B>
<BR>
<B>char *type, struct in_addr *addrs);</B>
<BR>
<B>size_t rangetoa(struct in_addr *addrs, int format,</B>
<BR>
<B>char *dst, size_t dstlen);</B>
<A NAME="lbAD"> </A>
<H2>DESCRIPTION</H2>
These functions are obsolete;
there is no current equivalent,
because so far they have not proved useful.
<P>
<I>Atoasr</I>
converts an ASCII address, subnet, or address range
into a suitable combination of binary addresses
(in network byte order).
<I>Rangetoa</I>
converts an address range back into ASCII,
using dotted-decimal form for the addresses
(the other reverse conversions are handled by
<I><A HREF="ipsec_addrtoa.3.html">ipsec_addrtoa</A></I>(3)
and
<I><A HREF="ipsec_subnettoa.3.html">ipsec_subnettoa</A></I>(3)).
<P>
A single address can be any form acceptable to
<I><A HREF="ipsec_atoaddr.3.html">ipsec_atoaddr</A></I>(3):
dotted decimal, DNS name, or hexadecimal number.
A subnet
specification uses the form <I>network</I><B>/</B><I>mask</I>
interpreted by
<I><A HREF="ipsec_atosubnet.3.html">ipsec_atosubnet</A></I>(3).
<P>
An address range is two
<I><A HREF="ipsec_atoaddr.3.html">ipsec_atoaddr</A></I>(3)
addresses separated by a
<B>...</B>
delimiter.
If there are four dots rather than three, the first is taken as
part of the begin address,
e.g. for a complete DNS name which ends with
<B>.</B>
to suppress completion attempts.
The begin address of a range must be
less than or equal to the end address.
<P>
The
<I>srclen</I>
parameter of
<I>atoasr</I>
specifies the length of the ASCII string pointed to by
<I>src</I>;
it is an error for there to be anything else
(e.g., a terminating NUL) within that length.
As a convenience for cases where an entire NUL-terminated string is
to be converted,
a
<I>srclen</I>
value of
<B>0</B>
is taken to mean
<B>strlen(src)</B>.
<P>
The
<I>type</I>
parameter of
<I>atoasr</I>
must point to a
<B>char</B>
variable used to record which form was found.
The
<I>addrs</I>
parameter must point to a two-element array of
<B>struct in_addr</B>
which receives the results.
The values stored into
<B>*type</B>,
and the corresponding values in the array, are:
<P>
<TT> </TT>*typeaddrs[0]addrs[1]<BR>
<P>
address<B>'a'</B>address-<BR>
<BR>
subnet<TT> </TT><B>'s'</B>networkmask<BR>
<BR>
range<TT> </TT><B>'r'</B>beginend<BR>
<P>
The
<I>dstlen</I>
parameter of
<I>rangetoa</I>
specifies the size of the
<I>dst</I>
parameter;
under no circumstances are more than
<I>dstlen</I>
bytes written to
<I>dst</I>.
A result which will not fit is truncated.
<I>Dstlen</I>
can be zero, in which case
<I>dst</I>
need not be valid and no result is written,
but the return value is unaffected;
in all other cases, the (possibly truncated) result is NUL-terminated.
The
<I>freeswan.h</I>
header file defines a constant,
<B>RANGETOA_BUF</B>,
which is the size of a buffer just large enough for worst-case results.
<P>
The
<I>format</I>
parameter of
<I>rangetoa</I>
specifies what format is to be used for the conversion.
The value
<B>0</B>
(not the ASCII character
<B>'0'</B>,
but a zero value)
specifies a reasonable default,
and is in fact the only format currently available.
This parameter is a hedge against future needs.
<P>
<I>Atoasr</I>
returns NULL for success and
a pointer to a string-literal error message for failure;
see DIAGNOSTICS.
<I>Rangetoa</I>
returns
<B>0</B>
for a failure, and otherwise
always returns the size of buffer which would
be needed to
accommodate the full conversion result, including terminating NUL;
it is the caller's responsibility to check this against the size of
the provided buffer to determine whether truncation has occurred.
<A NAME="lbAE"> </A>
<H2>SEE ALSO</H2>
<A HREF="ipsec_atoaddr.3.html">ipsec_atoaddr</A>(3), <A HREF="ipsec_atosubnet.3.html">ipsec_atosubnet</A>(3)
<A NAME="lbAF"> </A>
<H2>DIAGNOSTICS</H2>
Fatal errors in
<I>atoasr</I>
are:
empty input;
error in
<I><A HREF="ipsec_atoaddr.3.html">ipsec_atoaddr</A></I>(3)
or
<I><A HREF="ipsec_atosubnet.3.html">ipsec_atosubnet</A></I>(3)
during conversion;
begin address of range exceeds end address.
<P>
Fatal errors in
<I>rangetoa</I>
are:
unknown format.
<A NAME="lbAG"> </A>
<H2>HISTORY</H2>
Written for the FreeS/WAN project by Henry Spencer.
<A NAME="lbAH"> </A>
<H2>BUGS</H2>
The restriction of error reports to literal strings
(so that callers don't need to worry about freeing them or copying them)
does limit the precision of error reporting.
<P>
The error-reporting convention lends itself
to slightly obscure code,
because many readers will not think of NULL as signifying success.
A good way to make it clearer is to write something like:
<P>
<DL COMPACT><DT><DD>
<PRE>
<B>const char *error;</B>
<B>error = atoasr( /* ... */ );</B>
<B>if (error != NULL) {</B>
<B> /* something went wrong */</B>
</PRE>
</DL>
<P>
<HR>
<A NAME="index"> </A><H2>Index</H2>
<DL>
<DT><A HREF="#lbAB">NAME</A><DD>
<DT><A HREF="#lbAC">SYNOPSIS</A><DD>
<DT><A HREF="#lbAD">DESCRIPTION</A><DD>
<DT><A HREF="#lbAE">SEE ALSO</A><DD>
<DT><A HREF="#lbAF">DIAGNOSTICS</A><DD>
<DT><A HREF="#lbAG">HISTORY</A><DD>
<DT><A HREF="#lbAH">BUGS</A><DD>
</DL>
<HR>
This document was created by
<A HREF="http://localhost/cgi-bin/man/man2html">man2html</A>,
using the manual pages.<BR>
Time: 21:40:17 GMT, November 11, 2003
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