22

✏️ Editing: BIO_ADDRINFO_address.3

.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35)
.\"
.\" 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
..
.\" Set up some character translations and predefined strings.  \*(-- will
.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left
.\" double quote, and \*(R" will give a right double quote.  \*(C+ will
.\" give a nicer C++.  Capital omega is used to do unbreakable dashes and
.\" therefore won't be available.  \*(C` and \*(C' expand to `' in nroff,
.\" nothing in troff, for use with C<>.
.tr \(*W-
.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
.ie n \{\
.    ds -- \(*W-
.    ds PI pi
.    if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch
.    if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\"  diablo 12 pitch
.    ds L" ""
.    ds R" ""
.    ds C` ""
.    ds C' ""
'br\}
.el\{\
.    ds -- \|\(em\|
.    ds PI \(*p
.    ds L" ``
.    ds R" ''
.    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
.\"
.\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
.\" Fear.  Run.  Save yourself.  No user-serviceable parts.
.    \" fudge factors for nroff and troff
.if n \{\
.    ds #H 0
.    ds #V .8m
.    ds #F .3m
.    ds #[ \f1
.    ds #] \fP
.\}
.if t \{\
.    ds #H ((1u-(\\\\n(.fu%2u))*.13m)
.    ds #V .6m
.    ds #F 0
.    ds #[ \&
.    ds #] \&
.\}
.    \" simple accents for nroff and troff
.if n \{\
.    ds ' \&
.    ds ` \&
.    ds ^ \&
.    ds , \&
.    ds ~ ~
.    ds /
.\}
.if t \{\
.    ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u"
.    ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u'
.    ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u'
.    ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u'
.    ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u'
.    ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u'
.\}
.    \" troff and (daisy-wheel) nroff accents
.ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V'
.ds 8 \h'\*(#H'\(*b\h'-\*(#H'
.ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#]
.ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H'
.ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u'
.ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#]
.ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#]
.ds ae a\h'-(\w'a'u*4/10)'e
.ds Ae A\h'-(\w'A'u*4/10)'E
.    \" corrections for vroff
.if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u'
.if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u'
.    \" for low resolution devices (crt and lpr)
.if \n(.H>23 .if \n(.V>19 \
\{\
.    ds : e
.    ds 8 ss
.    ds o a
.    ds d- d\h'-1'\(ga
.    ds D- D\h'-1'\(hy
.    ds th \o'bp'
.    ds Th \o'LP'
.    ds ae ae
.    ds Ae AE
.\}
.rm #[ #] #H #V #F C
.\" ========================================================================
.\"
.IX Title "BIO_ADDRINFO 3"
.TH BIO_ADDRINFO 3 "2023-09-11" "1.1.1w" "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_lookup_type, BIO_ADDRINFO, BIO_ADDRINFO_next, BIO_ADDRINFO_free, BIO_ADDRINFO_family, BIO_ADDRINFO_socktype, BIO_ADDRINFO_protocol, BIO_ADDRINFO_address, BIO_lookup_ex, BIO_lookup \&\- BIO_ADDRINFO type and routines
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\& #include <sys/types.h>
\& #include <openssl/bio.h>
\&
\& typedef union bio_addrinfo_st BIO_ADDRINFO;
\&
\& enum BIO_lookup_type {
\&     BIO_LOOKUP_CLIENT, BIO_LOOKUP_SERVER
\& };
\&
\& int BIO_lookup_ex(const char *host, const char *service, int lookup_type,
\&                   int family, int socktype, int protocol, BIO_ADDRINFO **res);
\& int BIO_lookup(const char *node, const char *service,
\&                enum BIO_lookup_type lookup_type,
\&                int family, int socktype, BIO_ADDRINFO **res);
\&
\& const BIO_ADDRINFO *BIO_ADDRINFO_next(const BIO_ADDRINFO *bai);
\& int BIO_ADDRINFO_family(const BIO_ADDRINFO *bai);
\& int BIO_ADDRINFO_socktype(const BIO_ADDRINFO *bai);
\& int BIO_ADDRINFO_protocol(const BIO_ADDRINFO *bai);
\& const BIO_ADDR *BIO_ADDRINFO_address(const BIO_ADDRINFO *bai);
\& void BIO_ADDRINFO_free(BIO_ADDRINFO *bai);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \fB\s-1BIO_ADDRINFO\s0\fR type is a wrapper for address information
types provided on your platform.
.PP
\&\fB\s-1BIO_ADDRINFO\s0\fR normally forms a chain of several that can be
picked at one by one.
.PP
\&\fBBIO_lookup_ex()\fR looks up a specified \fBhost\fR and \fBservice\fR, and
uses \fBlookup_type\fR to determine what the default address should
be if \fBhost\fR is \fB\s-1NULL\s0\fR. \fBfamily\fR, \fBsocktype\fR and \fBprotocol\fR are used to
determine what protocol family, socket type and protocol should be used for
the lookup.  \fBfamily\fR can be any of \s-1AF_INET, AF_INET6, AF_UNIX\s0 and
\&\s-1AF_UNSPEC.\s0 \fBsocktype\fR can be \s-1SOCK_STREAM, SOCK_DGRAM\s0 or 0. Specifying 0
indicates that any type can be used. \fBprotocol\fR specifies a protocol such as
\&\s-1IPPROTO_TCP, IPPROTO_UDP\s0 or \s-1IPPORTO_SCTP.\s0 If set to 0 than any protocol can be
used. \fBres\fR points at a pointer to hold the start of a \fB\s-1BIO_ADDRINFO\s0\fR
chain.
.PP
For the family \fB\s-1AF_UNIX\s0\fR, \fBBIO_lookup_ex()\fR will ignore the \fBservice\fR
parameter and expects the \fBnode\fR parameter to hold the path to the
socket file.
.PP
\&\fBBIO_lookup()\fR does the same as \fBBIO_lookup_ex()\fR but does not provide the ability
to select based on the protocol (any protocol may be returned).
.PP
\&\fBBIO_ADDRINFO_family()\fR returns the family of the given
\&\fB\s-1BIO_ADDRINFO\s0\fR.  The result will be one of the constants
\&\s-1AF_INET, AF_INET6\s0 and \s-1AF_UNIX.\s0
.PP
\&\fBBIO_ADDRINFO_socktype()\fR returns the socket type of the given
\&\fB\s-1BIO_ADDRINFO\s0\fR.  The result will be one of the constants
\&\s-1SOCK_STREAM\s0 and \s-1SOCK_DGRAM.\s0
.PP
\&\fBBIO_ADDRINFO_protocol()\fR returns the protocol id of the given
\&\fB\s-1BIO_ADDRINFO\s0\fR.  The result will be one of the constants
\&\s-1IPPROTO_TCP\s0 and \s-1IPPROTO_UDP.\s0
.PP
\&\fBBIO_ADDRINFO_address()\fR returns the underlying \fB\s-1BIO_ADDR\s0\fR
of the given \fB\s-1BIO_ADDRINFO\s0\fR.
.PP
\&\fBBIO_ADDRINFO_next()\fR returns the next \fB\s-1BIO_ADDRINFO\s0\fR in the chain
from the given one.
.PP
\&\fBBIO_ADDRINFO_free()\fR frees the chain of \fB\s-1BIO_ADDRINFO\s0\fR starting
with the given one.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBBIO_lookup_ex()\fR and \fBBIO_lookup()\fR return 1 on success and 0 when an error
occurred, and will leave an error indication on the OpenSSL error stack in that
case.
.PP
All other functions described here return 0 or \fB\s-1NULL\s0\fR when the
information they should return isn't available.
.SH "NOTES"
.IX Header "NOTES"
The \fBBIO_lookup_ex()\fR implementation uses the platform provided \fBgetaddrinfo()\fR
function. On Linux it is known that specifying 0 for the protocol will not
return any \s-1SCTP\s0 based addresses when calling \fBgetaddrinfo()\fR. Therefore, if an \s-1SCTP\s0
address is required then the \fBprotocol\fR parameter to \fBBIO_lookup_ex()\fR should be
explicitly set to \s-1IPPROTO_SCTP.\s0 The same may be true on other platforms.
.SH "HISTORY"
.IX Header "HISTORY"
The \fBBIO_lookup_ex()\fR function was added in OpenSSL 1.1.1.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2016\-2020 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.

MR SKB