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+.\" -*- mode: troff; coding: utf-8 -*-
+.\" Automatically generated by Pod::Man v6.0.2 (Pod::Simple 3.45)
+.\"
+.\" Standard preamble:
+.\" ========================================================================
+.de Sp \" Vertical space (when we can't use .PP)
+.if t .sp .5v
+.if n .sp
+..
+.de Vb \" Begin verbatim text
+.ft CW
+.nf
+.ne \\$1
+..
+.de Ve \" End verbatim text
+.ft R
+.fi
+..
+.\" \*(C` and \*(C' are quotes in nroff, nothing in troff, for use with C<>.
+.ie n \{\
+.    ds C` ""
+.    ds C' ""
+'br\}
+.el\{\
+.    ds C`
+.    ds C'
+'br\}
+.\"
+.\" Escape single quotes in literal strings from groff's Unicode transform.
+.ie \n(.g .ds Aq \(aq
+.el       .ds Aq '
+.\"
+.\" If the F register is >0, we'll generate index entries on stderr for
+.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
+.\" entries marked with X<> in POD.  Of course, you'll have to process the
+.\" output yourself in some meaningful fashion.
+.\"
+.\" Avoid warning from groff about undefined register 'F'.
+.de IX
+..
+.nr rF 0
+.if \n(.g .if rF .nr rF 1
+.if (\n(rF:(\n(.g==0)) \{\
+.    if \nF \{\
+.        de IX
+.        tm Index:\\$1\t\\n%\t"\\$2"
+..
+.        if !\nF==2 \{\
+.            nr % 0
+.            nr F 2
+.        \}
+.    \}
+.\}
+.rr rF
+.\"
+.\" Required to disable full justification in groff 1.23.0.
+.if n .ds AD l
+.\" ========================================================================
+.\"
+.IX Title "BIO_ADDR 3ossl"
+.TH BIO_ADDR 3ossl 2026-04-07 3.5.6 OpenSSL
+.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
+.\" way too many mistakes in technical documents.
+.if n .ad l
+.nh
+.SH NAME
+BIO_ADDR, BIO_ADDR_new, BIO_ADDR_copy, BIO_ADDR_dup, BIO_ADDR_clear,
+BIO_ADDR_free, BIO_ADDR_rawmake,
+BIO_ADDR_family, BIO_ADDR_rawaddress, BIO_ADDR_rawport,
+BIO_ADDR_hostname_string, BIO_ADDR_service_string,
+BIO_ADDR_path_string \- BIO_ADDR routines
+.SH SYNOPSIS
+.IX Header "SYNOPSIS"
+.Vb 2
+\& #include <sys/types.h>
+\& #include <openssl/bio.h>
+\&
+\& typedef union bio_addr_st BIO_ADDR;
+\&
+\& BIO_ADDR *BIO_ADDR_new(void);
+\& int BIO_ADDR_copy(BIO_ADDR *dst, const BIO_ADDR *src);
+\& BIO_ADDR *BIO_ADDR_dup(const BIO_ADDR *ap);
+\& void BIO_ADDR_free(BIO_ADDR *ap);
+\& void BIO_ADDR_clear(BIO_ADDR *ap);
+\& int BIO_ADDR_rawmake(BIO_ADDR *ap, int family,
+\&                      const void *where, size_t wherelen, unsigned short port);
+\& int BIO_ADDR_family(const BIO_ADDR *ap);
+\& int BIO_ADDR_rawaddress(const BIO_ADDR *ap, void *p, size_t *l);
+\& unsigned short BIO_ADDR_rawport(const BIO_ADDR *ap);
+\& char *BIO_ADDR_hostname_string(const BIO_ADDR *ap, int numeric);
+\& char *BIO_ADDR_service_string(const BIO_ADDR *ap, int numeric);
+\& char *BIO_ADDR_path_string(const BIO_ADDR *ap);
+.Ve
+.SH DESCRIPTION
+.IX Header "DESCRIPTION"
+The \fBBIO_ADDR\fR type is a wrapper around all types of socket
+addresses that OpenSSL deals with, currently transparently
+supporting AF_INET, AF_INET6 and AF_UNIX according to what\*(Aqs
+available on the platform at hand.
+.PP
+\&\fBBIO_ADDR_new()\fR creates a new unfilled \fBBIO_ADDR\fR, to be used
+with routines that will fill it with information, such as
+\&\fBBIO_accept_ex()\fR.
+.PP
+\&\fBBIO_ADDR_copy()\fR copies the contents of \fBsrc\fR into \fBdst\fR. Neither \fBsrc\fR or
+\&\fBdst\fR can be NULL.
+.PP
+\&\fBBIO_ADDR_dup()\fR creates a new \fBBIO_ADDR\fR, with a copy of the
+address data in \fBap\fR.
+.PP
+\&\fBBIO_ADDR_free()\fR frees a \fBBIO_ADDR\fR created with \fBBIO_ADDR_new()\fR
+or \fBBIO_ADDR_dup()\fR. If the argument is NULL, nothing is done.
+.PP
+\&\fBBIO_ADDR_clear()\fR clears any data held within the provided \fBBIO_ADDR\fR and sets
+it back to an uninitialised state.
+.PP
+\&\fBBIO_ADDR_rawmake()\fR takes a protocol \fBfamily\fR, a byte array of
+size \fBwherelen\fR with an address in network byte order pointed at
+by \fBwhere\fR and a port number in network byte order in \fBport\fR (except
+for the \fBAF_UNIX\fR protocol family, where \fBport\fR is meaningless and
+therefore ignored) and populates the given \fBBIO_ADDR\fR with them.
+In case this creates a \fBAF_UNIX\fR \fBBIO_ADDR\fR, \fBwherelen\fR is expected
+to be the length of the path string (not including the terminating
+NUL, such as the result of a call to \fBstrlen()\fR).
+Read on about the addresses in "RAW ADDRESSES" below.
+.PP
+\&\fBBIO_ADDR_family()\fR returns the protocol family of the given
+\&\fBBIO_ADDR\fR.  The possible non\-error results are one of the
+constants AF_INET, AF_INET6 and AF_UNIX. It will also return AF_UNSPEC if the
+BIO_ADDR has not been initialised.
+.PP
+\&\fBBIO_ADDR_rawaddress()\fR will write the raw address of the given
+\&\fBBIO_ADDR\fR in the area pointed at by \fBp\fR if \fBp\fR is non\-NULL,
+and will set \fB*l\fR to be the amount of bytes the raw address
+takes up if \fBl\fR is non\-NULL.
+A technique to only find out the size of the address is a call
+with \fBp\fR set to \fBNULL\fR.  The raw address will be in network byte
+order, most significant byte first.
+In case this is a \fBAF_UNIX\fR \fBBIO_ADDR\fR, \fBl\fR gets the length of the
+path string (not including the terminating NUL, such as the result of
+a call to \fBstrlen()\fR).
+Read on about the addresses in "RAW ADDRESSES" below.
+.PP
+\&\fBBIO_ADDR_rawport()\fR returns the raw port of the given \fBBIO_ADDR\fR.
+The raw port will be in network byte order.
+.PP
+\&\fBBIO_ADDR_hostname_string()\fR returns a character string with the
+hostname of the given \fBBIO_ADDR\fR.  If \fBnumeric\fR is 1, the string
+will contain the numerical form of the address.  This only works for
+\&\fBBIO_ADDR\fR of the protocol families AF_INET and AF_INET6.  The
+returned string has been allocated on the heap and must be freed
+with \fBOPENSSL_free()\fR.
+.PP
+\&\fBBIO_ADDR_service_string()\fR returns a character string with the
+service name of the port of the given \fBBIO_ADDR\fR.  If \fBnumeric\fR
+is 1, the string will contain the port number.  This only works
+for \fBBIO_ADDR\fR of the protocol families AF_INET and AF_INET6.  The
+returned string has been allocated on the heap and must be freed
+with \fBOPENSSL_free()\fR.
+.PP
+\&\fBBIO_ADDR_path_string()\fR returns a character string with the path
+of the given \fBBIO_ADDR\fR.  This only works for \fBBIO_ADDR\fR of the
+protocol family AF_UNIX.  The returned string has been allocated
+on the heap and must be freed with \fBOPENSSL_free()\fR.
+.SH "RAW ADDRESSES"
+.IX Header "RAW ADDRESSES"
+Both \fBBIO_ADDR_rawmake()\fR and \fBBIO_ADDR_rawaddress()\fR take a pointer to a
+network byte order address of a specific site.  Internally, those are
+treated as a pointer to \fBstruct in_addr\fR (for \fBAF_INET\fR), \fBstruct
+in6_addr\fR (for \fBAF_INET6\fR) or \fBchar *\fR (for \fBAF_UNIX\fR), all
+depending on the protocol family the address is for.
+.SH "RETURN VALUES"
+.IX Header "RETURN VALUES"
+The string producing functions \fBBIO_ADDR_hostname_string()\fR,
+\&\fBBIO_ADDR_service_string()\fR and \fBBIO_ADDR_path_string()\fR will
+return \fBNULL\fR on error and leave an error indication on the
+OpenSSL error stack.
+.PP
+\&\fBBIO_ADDR_copy()\fR returns 1 on success or 0 on error.
+.PP
+All other functions described here return 0 or \fBNULL\fR when the
+information they should return isn\*(Aqt available.
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+\&\fBBIO_connect\fR\|(3), \fBBIO_s_connect\fR\|(3)
+.SH HISTORY
+.IX Header "HISTORY"
+\&\fBBIO_ADDR_copy()\fR and \fBBIO_ADDR_dup()\fR were added in OpenSSL 3.2.
+.SH COPYRIGHT
+.IX Header "COPYRIGHT"
+Copyright 2016\-2024 The OpenSSL Project Authors. All Rights Reserved.
+.PP
+Licensed under the Apache License 2.0 (the "License").  You may not use
+this file except in compliance with the License.  You can obtain a copy
+in the file LICENSE in the source distribution or at
+<https://www.openssl.org/source/license.html>.