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-.\" $OpenBSD: a2i_ipadd.3,v 1.1 2024/12/27 15:30:17 schwarze Exp $
-.\"
-.\" Copyright (c) 2024 Ingo Schwarze <schwarze@openbsd.org>
-.\"
-.\" Permission to use, copy, modify, and distribute this software for any
-.\" purpose with or without fee is hereby granted, provided that the above
-.\" copyright notice and this permission notice appear in all copies.
-.\"
-.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
-.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-.\"
-.Dd $Mdocdate: December 27 2024 $
-.Dt A2I_IPADD 3
-.Os
-.Sh NAME
-.Nm a2i_ipadd ,
-.Nm a2i_IPADDRESS ,
-.Nm a2i_IPADDRESS_NC
-.Nd parse Internet Protocol addresses into ASN.1 OCTET STRINGs for X.509
-.Sh SYNOPSIS
-.In openssl/x509v3.h
-.Ft int
-.Fo a2i_ipadd
-.Fa "unsigned char *ipout"
-.Fa "const char *ipasc"
-.Fc
-.Ft ASN1_OCTET_STRING *
-.Fo a2i_IPADDRESS
-.Fa "const char *ipasc"
-.Fc
-.Ft ASN1_OCTET_STRING *
-.Fo a2i_IPADDRESS_NC
-.Fa "const char *ipasc"
-.Fc
-.Sh DESCRIPTION
-.Fn a2i_ipadd
-and
-.Fn a2i_IPADDRESS
-parse the string
-.Fa ipasc
-containing an IPv4 or IPv6 address
-in one of the following formats:
-.Bd -literal -offset indent
-d.d.d.d
-x:x:x:x:x:x:x:x (exactly 8 words)
-(x:)*x::x(:x)* (less than 8 words)
-(x:)*x:: (less than 8 words)
-::x(:x)* (less than 8 words)
-::
-(x:)*d.d.d.d (up to 6 hexadecimal words, :: can be used)
-.Ed
-.Pp
-where each
-.Ar d
-represents a non-negative decimal number less than 256
-with one, two or three digits and each
-.Ar x
-represents a non-negative hexadecimal number
-with one, two, three, or four digits.
-Both the lower case letters a-f and the upper case letters A-F can be used.
-.Pp
-.Fn a2i_ipadd
-stores the bytes of the address in network byte order (big endian) starting at
-.Fa ipout .
-The caller is responsible for providing sufficient space;
-always providing a buffer of at least 16 bytes is recommended,
-even if an IPv4 address is expected, to avoid buffer overruns in case
-.Fa ipasc
-is malformed.
-.Pp
-.Fn a2i_IPADDRESS
-stores the address in a newly allocated ASN.1
-.Vt OCTET STRING .
-.Pp
-.Fn a2i_IPADDRESS_NC
-expects
-.Fa ipasc
-to contain two addresses of the same address family in the above form,
-separated by a slash
-.Pq Sq /
-character, and stores the concatenation of both addresses
-in a newly allocated ASN.1
-.Vt OCTET STRING ,
-which is typically used for address/mask pairs
-in name constraint extensions of CA certificates.
-.Sh RETURN VALUES
-.Fn a2i_ipadd
-returns the number of bytes written to
-.Fa ipout
-in case of success, i.e. 4 for an IPv4 or 16 for an IPv6 address,
-or 0 if parsing failed.
-.Pp
-.Fn a2i_IPADDRESS
-and
-.Fn a2i_IPADDRESS_NC
-return the new object or
-.Dv NULL
-if parsing or memory allocation failed.
-.Sh SEE ALSO
-.Xr a2i_ASN1_STRING 3 ,
-.Xr ASN1_OCTET_STRING_new 3 ,
-.Xr ASN1_OCTET_STRING_set 3 ,
-.Xr GENERAL_NAME_new 3 ,
-.Xr IPAddressRange_new 3 ,
-.Xr NAME_CONSTRAINTS_new 3 ,
-.Xr s2i_ASN1_OCTET_STRING 3 ,
-.Xr X509_EXTENSION_new 3
-.Sh STANDARDS
-RFC 5280: Internet X.509 Public Key Infrastructure Certificate and
-Certificate Revocation List (CRL) Profile
-.Bl -dash -width 1n -compact
-.It
-section 4.2.1.6: Subject Alternative Name
-.It
-section 4.2.1.10: Name Constraints
-.El
-.Sh HISTORY
-.Fn a2i_IPADDRESS
-and
-.Fn a2i_IPADDRESS_NC
-first appeared in OpenSSL 0.9.8 and
-.Fn a2i_ipadd
-in OpenSSL 0.9.8e.
-They have been available since
-.Ox 4.5 .
-.Sh CAVEATS
-While some syntax errors are caught, only minimal validation takes place,
-and these functions often return objects that make no sense, in particular
-in the context of IPv6.
-For example, the trailing :d.d.d.d syntax can be appended
-to a hexadecimal part that results in twelve arbitrary bytes.