1=pod 2 3=head1 NAME 4 5BIO_lookup_type, 6BIO_ADDRINFO, BIO_ADDRINFO_next, BIO_ADDRINFO_free, 7BIO_ADDRINFO_family, BIO_ADDRINFO_socktype, BIO_ADDRINFO_protocol, 8BIO_ADDRINFO_address, 9BIO_lookup_ex, 10BIO_lookup 11- BIO_ADDRINFO type and routines 12 13=head1 SYNOPSIS 14 15 #include <sys/types.h> 16 #include <openssl/bio.h> 17 18 typedef union bio_addrinfo_st BIO_ADDRINFO; 19 20 enum BIO_lookup_type { 21 BIO_LOOKUP_CLIENT, BIO_LOOKUP_SERVER 22 }; 23 24 int BIO_lookup_ex(const char *host, const char *service, int lookup_type, 25 int family, int socktype, int protocol, BIO_ADDRINFO **res); 26 int BIO_lookup(const char *host, const char *service, 27 enum BIO_lookup_type lookup_type, 28 int family, int socktype, BIO_ADDRINFO **res); 29 30 const BIO_ADDRINFO *BIO_ADDRINFO_next(const BIO_ADDRINFO *bai); 31 int BIO_ADDRINFO_family(const BIO_ADDRINFO *bai); 32 int BIO_ADDRINFO_socktype(const BIO_ADDRINFO *bai); 33 int BIO_ADDRINFO_protocol(const BIO_ADDRINFO *bai); 34 const BIO_ADDR *BIO_ADDRINFO_address(const BIO_ADDRINFO *bai); 35 void BIO_ADDRINFO_free(BIO_ADDRINFO *bai); 36 37=head1 DESCRIPTION 38 39The B<BIO_ADDRINFO> type is a wrapper for address information 40types provided on your platform. 41 42B<BIO_ADDRINFO> normally forms a chain of several that can be 43picked at one by one. 44 45BIO_lookup_ex() looks up a specified B<host> and B<service>, and 46uses B<lookup_type> to determine what the default address should 47be if B<host> is B<NULL>. B<family>, B<socktype> and B<protocol> are used to 48determine what protocol family, socket type and protocol should be used for 49the lookup. B<family> can be any of AF_INET, AF_INET6, AF_UNIX and 50AF_UNSPEC. B<socktype> can be SOCK_STREAM, SOCK_DGRAM or 0. Specifying 0 51indicates that any type can be used. B<protocol> specifies a protocol such as 52IPPROTO_TCP, IPPROTO_UDP or IPPORTO_SCTP. If set to 0 than any protocol can be 53used. B<res> points at a pointer to hold the start of a B<BIO_ADDRINFO> 54chain. 55 56For the family B<AF_UNIX>, BIO_lookup_ex() will ignore the B<service> 57parameter and expects the B<host> parameter to hold the path to the socket file. 58 59BIO_lookup() does the same as BIO_lookup_ex() but does not provide the ability 60to select based on the protocol (any protocol may be returned). 61 62BIO_ADDRINFO_family() returns the family of the given 63B<BIO_ADDRINFO>. The result will be one of the constants 64AF_INET, AF_INET6 and AF_UNIX. 65 66BIO_ADDRINFO_socktype() returns the socket type of the given 67B<BIO_ADDRINFO>. The result will be one of the constants 68SOCK_STREAM and SOCK_DGRAM. 69 70BIO_ADDRINFO_protocol() returns the protocol id of the given 71B<BIO_ADDRINFO>. The result will be one of the constants 72IPPROTO_TCP and IPPROTO_UDP. 73 74BIO_ADDRINFO_address() returns the underlying B<BIO_ADDR> 75of the given B<BIO_ADDRINFO>. 76 77BIO_ADDRINFO_next() returns the next B<BIO_ADDRINFO> in the chain 78from the given one. 79 80BIO_ADDRINFO_free() frees the chain of B<BIO_ADDRINFO> starting 81with the given one. If the argument is NULL, nothing is done. 82 83=head1 RETURN VALUES 84 85BIO_lookup_ex() and BIO_lookup() return 1 on success and 0 when an error 86occurred, and will leave an error indication on the OpenSSL error stack in that 87case. 88 89All other functions described here return 0 or B<NULL> when the 90information they should return isn't available. 91 92=head1 NOTES 93 94The BIO_lookup_ex() implementation uses the platform provided getaddrinfo() 95function. On Linux it is known that specifying 0 for the protocol will not 96return any SCTP based addresses when calling getaddrinfo(). Therefore, if an SCTP 97address is required then the B<protocol> parameter to BIO_lookup_ex() should be 98explicitly set to IPPROTO_SCTP. The same may be true on other platforms. 99 100=head1 HISTORY 101 102The BIO_lookup_ex() function was added in OpenSSL 1.1.1. 103 104=head1 COPYRIGHT 105 106Copyright 2016-2024 The OpenSSL Project Authors. All Rights Reserved. 107 108Licensed under the Apache License 2.0 (the "License"). You may not use 109this file except in compliance with the License. You can obtain a copy 110in the file LICENSE in the source distribution or at 111L<https://www.openssl.org/source/license.html>. 112 113=cut 114