✏ 编辑: BIO_lookup_type.3

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.\" ========================================================================
.\"
.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
\&\fIBIO_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, \fIBIO_lookup_ex()\fR will ignore the \fBservice\fR
parameter and expects the \fBnode\fR parameter to hold the path to the
socket file.
.PP
\&\fIBIO_lookup()\fR does the same as \fIBIO_lookup_ex()\fR but does not provide the ability
to select based on the protocol (any protocol may be returned).
.PP
\&\fIBIO_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
\&\fIBIO_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
\&\fIBIO_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
\&\fIBIO_ADDRINFO_address()\fR returns the underlying \fB\s-1BIO_ADDR\s0\fR
of the given \fB\s-1BIO_ADDRINFO\s0\fR.
.PP
\&\fIBIO_ADDRINFO_next()\fR returns the next \fB\s-1BIO_ADDRINFO\s0\fR in the chain
from the given one.
.PP
\&\fIBIO_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"
\&\fIBIO_lookup_ex()\fR and \fIBIO_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 \fIBIO_lookup_ex()\fR implementation uses the platform provided \fIgetaddrinfo()\fR
function. On Linux it is known that specifying 0 for the protocol will not
return any \s-1SCTP\s0 based addresses when calling \fIgetaddrinfo()\fR. Therefore, if an \s-1SCTP\s0
address is required then the \fBprotocol\fR parameter to \fIBIO_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 \fIBIO_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>.

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