mirror of https://github.com/openssl/openssl.git
126 lines
4.9 KiB
Plaintext
126 lines
4.9 KiB
Plaintext
=pod
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=head1 NAME
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BIO_ADDR, BIO_ADDR_new, BIO_ADDR_clear, BIO_ADDR_free, BIO_ADDR_rawmake,
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BIO_ADDR_family, BIO_ADDR_rawaddress, BIO_ADDR_rawport,
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BIO_ADDR_hostname_string, BIO_ADDR_service_string,
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BIO_ADDR_path_string - BIO_ADDR routines
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=head1 SYNOPSIS
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#include <sys/types.h>
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#include <openssl/bio.h>
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typedef union bio_addr_st BIO_ADDR;
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BIO_ADDR *BIO_ADDR_new(void);
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void BIO_ADDR_free(BIO_ADDR *);
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void BIO_ADDR_clear(BIO_ADDR *ap);
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int BIO_ADDR_rawmake(BIO_ADDR *ap, int family,
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const void *where, size_t wherelen, unsigned short port);
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int BIO_ADDR_family(const BIO_ADDR *ap);
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int BIO_ADDR_rawaddress(const BIO_ADDR *ap, void *p, size_t *l);
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unsigned short BIO_ADDR_rawport(const BIO_ADDR *ap);
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char *BIO_ADDR_hostname_string(const BIO_ADDR *ap, int numeric);
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char *BIO_ADDR_service_string(const BIO_ADDR *ap, int numeric);
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char *BIO_ADDR_path_string(const BIO_ADDR *ap);
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=head1 DESCRIPTION
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The B<BIO_ADDR> type is a wrapper around all types of socket
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addresses that OpenSSL deals with, currently transparently
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supporting AF_INET, AF_INET6 and AF_UNIX according to what's
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available on the platform at hand.
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BIO_ADDR_new() creates a new unfilled B<BIO_ADDR>, to be used
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with routines that will fill it with information, such as
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BIO_accept_ex().
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BIO_ADDR_free() frees a B<BIO_ADDR> created with BIO_ADDR_new().
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BIO_ADDR_clear() clears any data held within the provided B<BIO_ADDR> and sets
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it back to an uninitialised state.
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BIO_ADDR_rawmake() takes a protocol B<family>, a byte array of
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size B<wherelen> with an address in network byte order pointed at
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by B<where> and a port number in network byte order in B<port> (except
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for the B<AF_UNIX> protocol family, where B<port> is meaningless and
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therefore ignored) and populates the given B<BIO_ADDR> with them.
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In case this creates a B<AF_UNIX> B<BIO_ADDR>, B<wherelen> is expected
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to be the length of the path string (not including the terminating
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NUL, such as the result of a call to strlen()).
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Read on about the addresses in L</RAW ADDRESSES> below.
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BIO_ADDR_family() returns the protocol family of the given
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B<BIO_ADDR>. The possible non-error results are one of the
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constants AF_INET, AF_INET6 and AF_UNIX. It will also return AF_UNSPEC if the
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BIO_ADDR has not been initialised.
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BIO_ADDR_rawaddress() will write the raw address of the given
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B<BIO_ADDR> in the area pointed at by B<p> if B<p> is non-NULL,
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and will set B<*l> to be the amount of bytes the raw address
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takes up if B<l> is non-NULL.
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A technique to only find out the size of the address is a call
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with B<p> set to B<NULL>. The raw address will be in network byte
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order, most significant byte first.
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In case this is a B<AF_UNIX> B<BIO_ADDR>, B<l> gets the length of the
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path string (not including the terminating NUL, such as the result of
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a call to strlen()).
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Read on about the addresses in L</RAW ADDRESSES> below.
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BIO_ADDR_rawport() returns the raw port of the given B<BIO_ADDR>.
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The raw port will be in network byte order.
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BIO_ADDR_hostname_string() returns a character string with the
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hostname of the given B<BIO_ADDR>. If B<numeric> is 1, the string
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will contain the numerical form of the address. This only works for
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B<BIO_ADDR> of the protocol families AF_INET and AF_INET6. The
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returned string has been allocated on the heap and must be freed
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with OPENSSL_free().
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BIO_ADDR_service_string() returns a character string with the
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service name of the port of the given B<BIO_ADDR>. If B<numeric>
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is 1, the string will contain the port number. This only works
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for B<BIO_ADDR> of the protocol families AF_INET and AF_INET6. The
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returned string has been allocated on the heap and must be freed
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with OPENSSL_free().
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BIO_ADDR_path_string() returns a character string with the path
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of the given B<BIO_ADDR>. This only works for B<BIO_ADDR> of the
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protocol family AF_UNIX. The returned string has been allocated
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on the heap and must be freed with OPENSSL_free().
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=head1 RAW ADDRESSES
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Both BIO_ADDR_rawmake() and BIO_ADDR_rawaddress() take a pointer to a
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network byte order address of a specific site. Internally, those are
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treated as a pointer to B<struct in_addr> (for B<AF_INET>), B<struct
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in6_addr> (for B<AF_INET6>) or B<char *> (for B<AF_UNIX>), all
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depending on the protocol family the address is for.
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=head1 RETURN VALUES
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The string producing functions BIO_ADDR_hostname_string(),
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BIO_ADDR_service_string() and BIO_ADDR_path_string() will
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return B<NULL> on error and leave an error indication on the
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OpenSSL error stack.
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All other functions described here return 0 or B<NULL> when the
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information they should return isn't available.
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=head1 SEE ALSO
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L<BIO_connect(3)>, L<BIO_s_connect(3)>
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=head1 COPYRIGHT
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Copyright 2016-2020 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). 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 LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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