1BIO_ADDRINFO(3ossl)                 OpenSSL                BIO_ADDRINFO(3ossl)
2
3
4

NAME

6       BIO_lookup_type, BIO_ADDRINFO, BIO_ADDRINFO_next, BIO_ADDRINFO_free,
7       BIO_ADDRINFO_family, BIO_ADDRINFO_socktype, BIO_ADDRINFO_protocol,
8       BIO_ADDRINFO_address, BIO_lookup_ex, BIO_lookup - BIO_ADDRINFO type and
9       routines
10

SYNOPSIS

12        #include <sys/types.h>
13        #include <openssl/bio.h>
14
15        typedef union bio_addrinfo_st BIO_ADDRINFO;
16
17        enum BIO_lookup_type {
18            BIO_LOOKUP_CLIENT, BIO_LOOKUP_SERVER
19        };
20
21        int BIO_lookup_ex(const char *host, const char *service, int lookup_type,
22                          int family, int socktype, int protocol, BIO_ADDRINFO **res);
23        int BIO_lookup(const char *host, const char *service,
24                       enum BIO_lookup_type lookup_type,
25                       int family, int socktype, BIO_ADDRINFO **res);
26
27        const BIO_ADDRINFO *BIO_ADDRINFO_next(const BIO_ADDRINFO *bai);
28        int BIO_ADDRINFO_family(const BIO_ADDRINFO *bai);
29        int BIO_ADDRINFO_socktype(const BIO_ADDRINFO *bai);
30        int BIO_ADDRINFO_protocol(const BIO_ADDRINFO *bai);
31        const BIO_ADDR *BIO_ADDRINFO_address(const BIO_ADDRINFO *bai);
32        void BIO_ADDRINFO_free(BIO_ADDRINFO *bai);
33

DESCRIPTION

35       The BIO_ADDRINFO type is a wrapper for address information types
36       provided on your platform.
37
38       BIO_ADDRINFO normally forms a chain of several that can be picked at
39       one by one.
40
41       BIO_lookup_ex() looks up a specified host and service, and uses
42       lookup_type to determine what the default address should be if host is
43       NULL. family, socktype and protocol are used to determine what protocol
44       family, socket type and protocol should be used for the lookup.  family
45       can be any of AF_INET, AF_INET6, AF_UNIX and AF_UNSPEC. socktype can be
46       SOCK_STREAM, SOCK_DGRAM or 0. Specifying 0 indicates that any type can
47       be used. protocol specifies a protocol such as IPPROTO_TCP, IPPROTO_UDP
48       or IPPORTO_SCTP. If set to 0 than any protocol can be used. res points
49       at a pointer to hold the start of a BIO_ADDRINFO chain.
50
51       For the family AF_UNIX, BIO_lookup_ex() will ignore the service
52       parameter and expects the host parameter to hold the path to the socket
53       file.
54
55       BIO_lookup() does the same as BIO_lookup_ex() but does not provide the
56       ability to select based on the protocol (any protocol may be returned).
57
58       BIO_ADDRINFO_family() returns the family of the given BIO_ADDRINFO.
59       The result will be one of the constants AF_INET, AF_INET6 and AF_UNIX.
60
61       BIO_ADDRINFO_socktype() returns the socket type of the given
62       BIO_ADDRINFO.  The result will be one of the constants SOCK_STREAM and
63       SOCK_DGRAM.
64
65       BIO_ADDRINFO_protocol() returns the protocol id of the given
66       BIO_ADDRINFO.  The result will be one of the constants IPPROTO_TCP and
67       IPPROTO_UDP.
68
69       BIO_ADDRINFO_address() returns the underlying BIO_ADDR of the given
70       BIO_ADDRINFO.
71
72       BIO_ADDRINFO_next() returns the next BIO_ADDRINFO in the chain from the
73       given one.
74
75       BIO_ADDRINFO_free() frees the chain of BIO_ADDRINFO starting with the
76       given one.
77

RETURN VALUES

79       BIO_lookup_ex() and BIO_lookup() return 1 on success and 0 when an
80       error occurred, and will leave an error indication on the OpenSSL error
81       stack in that case.
82
83       All other functions described here return 0 or NULL when the
84       information they should return isn't available.
85

NOTES

87       The BIO_lookup_ex() implementation uses the platform provided
88       getaddrinfo() function. On Linux it is known that specifying 0 for the
89       protocol will not return any SCTP based addresses when calling
90       getaddrinfo(). Therefore, if an SCTP address is required then the
91       protocol parameter to BIO_lookup_ex() should be explicitly set to
92       IPPROTO_SCTP. The same may be true on other platforms.
93

HISTORY

95       The BIO_lookup_ex() function was added in OpenSSL 1.1.1.
96

98       Copyright 2016-2021 The OpenSSL Project Authors. All Rights Reserved.
99
100       Licensed under the Apache License 2.0 (the "License").  You may not use
101       this file except in compliance with the License.  You can obtain a copy
102       in the file LICENSE in the source distribution or at
103       <https://www.openssl.org/source/license.html>.
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1073.0.9                             2023-07-27               BIO_ADDRINFO(3ossl)
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