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.\"
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.\" Copyright 1998 by the Massachusetts Institute of Technology.
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.\"
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.\" Permission to use, copy, modify, and distribute this
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.\" software and its documentation for any purpose and without
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.\" fee is hereby granted, provided that the above copyright
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.\" notice appear in all copies and that both that copyright
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.\" notice and this permission notice appear in supporting
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.\" documentation, and that the name of M.I.T. not be used in
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.\" advertising or publicity pertaining to distribution of the
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.\" software without specific, written prior permission.
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.\" M.I.T. makes no representations about the suitability of
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.\" this software for any purpose. It is provided "as is"
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.\" without express or implied warranty.
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.\"
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.TH ARES_EXPAND_NAME 3 "20 Nov 2009"
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.SH NAME
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ares_expand_name \- Expand a DNS-encoded domain name
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.SH SYNOPSIS
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.nf
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.B #include <ares.h>
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.PP
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.B int ares_expand_name(const unsigned char *\fIencoded\fP,
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.B const unsigned char *\fIabuf\fP, int \fIalen\fP, char **\fIs\fP,
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.B long *\fIenclen\fP)
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.fi
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.SH DESCRIPTION
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The
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.B ares_expand_name
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function converts a DNS-encoded domain name to a dot-separated C
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string. The argument
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.I encoded
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gives the beginning of the encoded domain name, and the arguments
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.I abuf
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and
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.I alen
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give the containing message buffer (necessary for the processing of
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indirection pointers within the encoded domain name). The result is
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placed in a NUL-terminated allocated buffer, a pointer to which is
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stored in the variable pointed to by
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.IR s .
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The length of the encoded name is stored in the variable pointed to by
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.I enclen
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so that the caller can advance past the encoded domain name to read
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further data in the message.
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Use \fIares_free_string(3)\fP to free the allocated hostname.
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.SH RETURN VALUES
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.B ares_expand_name
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can return any of the following values:
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.TP 15
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.B ARES_SUCCESS
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Expansion of the encoded name succeeded.
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.TP 15
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.B ARES_EBADNAME
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The encoded domain name was malformed and could not be expanded.
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.TP 15
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.B ARES_ENOMEM
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Memory was exhausted.
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.SH SEE ALSO
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.BR ares_mkquery (3), ares_free_string (3)
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.SH AUTHOR
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Greg Hudson, MIT Information Systems
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.br
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Copyright 1998 by the Massachusetts Institute of Technology.
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