237 lines
8.3 KiB
Groff
Executable File
237 lines
8.3 KiB
Groff
Executable File
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.\" ========================================================================
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.\"
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.IX Title "BIO_ADDRINFO 3"
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.TH BIO_ADDRINFO 3 "2020-03-02" "3.0.0-dev" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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BIO_lookup_type,
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BIO_ADDRINFO, BIO_ADDRINFO_next, BIO_ADDRINFO_free,
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BIO_ADDRINFO_family, BIO_ADDRINFO_socktype, BIO_ADDRINFO_protocol,
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BIO_ADDRINFO_address,
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BIO_lookup_ex,
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BIO_lookup
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\&\- BIO_ADDRINFO type and routines
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 2
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\& #include <sys/types.h>
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\& #include <openssl/bio.h>
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\&
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\& typedef union bio_addrinfo_st BIO_ADDRINFO;
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\&
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\& enum BIO_lookup_type {
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\& BIO_LOOKUP_CLIENT, BIO_LOOKUP_SERVER
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\& };
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\&
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\& int BIO_lookup_ex(const char *host, const char *service, int lookup_type,
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\& int family, int socktype, int protocol, BIO_ADDRINFO **res);
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\& int BIO_lookup(const char *node, const char *service,
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\& enum BIO_lookup_type lookup_type,
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\& int family, int socktype, BIO_ADDRINFO **res);
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\&
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\& const BIO_ADDRINFO *BIO_ADDRINFO_next(const BIO_ADDRINFO *bai);
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\& int BIO_ADDRINFO_family(const BIO_ADDRINFO *bai);
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\& int BIO_ADDRINFO_socktype(const BIO_ADDRINFO *bai);
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\& int BIO_ADDRINFO_protocol(const BIO_ADDRINFO *bai);
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\& const BIO_ADDR *BIO_ADDRINFO_address(const BIO_ADDRINFO *bai);
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\& void BIO_ADDRINFO_free(BIO_ADDRINFO *bai);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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The \fB\s-1BIO_ADDRINFO\s0\fR type is a wrapper for address information
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types provided on your platform.
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.PP
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\&\fB\s-1BIO_ADDRINFO\s0\fR normally forms a chain of several that can be
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picked at one by one.
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.PP
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\&\fIBIO_lookup_ex()\fR looks up a specified \fBhost\fR and \fBservice\fR, and
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uses \fBlookup_type\fR to determine what the default address should
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be if \fBhost\fR is \fB\s-1NULL\s0\fR. \fBfamily\fR, \fBsocktype\fR and \fBprotocol\fR are used to
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determine what protocol family, socket type and protocol should be used for
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the lookup. \fBfamily\fR can be any of \s-1AF_INET\s0, \s-1AF_INET6\s0, \s-1AF_UNIX\s0 and
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\&\s-1AF_UNSPEC\s0. \fBsocktype\fR can be \s-1SOCK_STREAM\s0, \s-1SOCK_DGRAM\s0 or 0. Specifying 0
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indicates that any type can be used. \fBprotocol\fR specifies a protocol such as
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\&\s-1IPPROTO_TCP\s0, \s-1IPPROTO_UDP\s0 or \s-1IPPORTO_SCTP\s0. If set to 0 than any protocol can be
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used. \fBres\fR points at a pointer to hold the start of a \fB\s-1BIO_ADDRINFO\s0\fR
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chain.
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.PP
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For the family \fB\s-1AF_UNIX\s0\fR, \fIBIO_lookup_ex()\fR will ignore the \fBservice\fR
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parameter and expects the \fBnode\fR parameter to hold the path to the
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socket file.
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.PP
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\&\fIBIO_lookup()\fR does the same as \fIBIO_lookup_ex()\fR but does not provide the ability
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to select based on the protocol (any protocol may be returned).
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.PP
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\&\fIBIO_ADDRINFO_family()\fR returns the family of the given
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\&\fB\s-1BIO_ADDRINFO\s0\fR. The result will be one of the constants
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\&\s-1AF_INET\s0, \s-1AF_INET6\s0 and \s-1AF_UNIX\s0.
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.PP
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\&\fIBIO_ADDRINFO_socktype()\fR returns the socket type of the given
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\&\fB\s-1BIO_ADDRINFO\s0\fR. The result will be one of the constants
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\&\s-1SOCK_STREAM\s0 and \s-1SOCK_DGRAM\s0.
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.PP
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\&\fIBIO_ADDRINFO_protocol()\fR returns the protocol id of the given
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\&\fB\s-1BIO_ADDRINFO\s0\fR. The result will be one of the constants
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\&\s-1IPPROTO_TCP\s0 and \s-1IPPROTO_UDP\s0.
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.PP
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\&\fIBIO_ADDRINFO_address()\fR returns the underlying \fB\s-1BIO_ADDR\s0\fR
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of the given \fB\s-1BIO_ADDRINFO\s0\fR.
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.PP
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\&\fIBIO_ADDRINFO_next()\fR returns the next \fB\s-1BIO_ADDRINFO\s0\fR in the chain
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from the given one.
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.PP
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\&\fIBIO_ADDRINFO_free()\fR frees the chain of \fB\s-1BIO_ADDRINFO\s0\fR starting
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with the given one.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIBIO_lookup_ex()\fR and \fIBIO_lookup()\fR return 1 on success and 0 when an error
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occurred, and will leave an error indication on the OpenSSL error stack in that
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case.
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.PP
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All other functions described here return 0 or \fB\s-1NULL\s0\fR when the
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information they should return isn't available.
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.SH "NOTES"
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.IX Header "NOTES"
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The \fIBIO_lookup_ex()\fR implementation uses the platform provided \fIgetaddrinfo()\fR
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function. On Linux it is known that specifying 0 for the protocol will not
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return any \s-1SCTP\s0 based addresses when calling \fIgetaddrinfo()\fR. Therefore if an \s-1SCTP\s0
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address is required then the \fBprotocol\fR parameter to \fIBIO_lookup_ex()\fR should be
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explicitly set to \s-1IPPROTO_SCTP\s0. The same may be true on other platforms.
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.SH "HISTORY"
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.IX Header "HISTORY"
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The \fIBIO_lookup_ex()\fR function was added in OpenSSL 1.1.1.
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2016\-2017 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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