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<title>BIO_ADDRINFO</title>
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<ul id="index">
  <li><a href="#NAME">NAME</a></li>
  <li><a href="#SYNOPSIS">SYNOPSIS</a></li>
  <li><a href="#DESCRIPTION">DESCRIPTION</a></li>
  <li><a href="#RETURN-VALUES">RETURN VALUES</a></li>
  <li><a href="#NOTES">NOTES</a></li>
  <li><a href="#HISTORY">HISTORY</a></li>
  <li><a href="#COPYRIGHT">COPYRIGHT</a></li>
</ul>

<h1 id="NAME">NAME</h1>

<p>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</p>

<h1 id="SYNOPSIS">SYNOPSIS</h1>

<pre><code>#include &lt;sys/types.h&gt;
#include &lt;openssl/bio.h&gt;

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 *host, 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);</code></pre>

<h1 id="DESCRIPTION">DESCRIPTION</h1>

<p>The <b>BIO_ADDRINFO</b> type is a wrapper for address information types provided on your platform.</p>

<p><b>BIO_ADDRINFO</b> normally forms a chain of several that can be picked at one by one.</p>

<p>BIO_lookup_ex() looks up a specified <b>host</b> and <b>service</b>, and uses <b>lookup_type</b> to determine what the default address should be if <b>host</b> is <b>NULL</b>. <b>family</b>, <b>socktype</b> and <b>protocol</b> are used to determine what protocol family, socket type and protocol should be used for the lookup. <b>family</b> can be any of AF_INET, AF_INET6, AF_UNIX and AF_UNSPEC. <b>socktype</b> can be SOCK_STREAM, SOCK_DGRAM or 0. Specifying 0 indicates that any type can be used. <b>protocol</b> specifies a protocol such as IPPROTO_TCP, IPPROTO_UDP or IPPORTO_SCTP. If set to 0 than any protocol can be used. <b>res</b> points at a pointer to hold the start of a <b>BIO_ADDRINFO</b> chain.</p>

<p>For the family <b>AF_UNIX</b>, BIO_lookup_ex() will ignore the <b>service</b> parameter and expects the <b>host</b> parameter to hold the path to the socket file.</p>

<p>BIO_lookup() does the same as BIO_lookup_ex() but does not provide the ability to select based on the protocol (any protocol may be returned).</p>

<p>BIO_ADDRINFO_family() returns the family of the given <b>BIO_ADDRINFO</b>. The result will be one of the constants AF_INET, AF_INET6 and AF_UNIX.</p>

<p>BIO_ADDRINFO_socktype() returns the socket type of the given <b>BIO_ADDRINFO</b>. The result will be one of the constants SOCK_STREAM and SOCK_DGRAM.</p>

<p>BIO_ADDRINFO_protocol() returns the protocol id of the given <b>BIO_ADDRINFO</b>. The result will be one of the constants IPPROTO_TCP and IPPROTO_UDP.</p>

<p>BIO_ADDRINFO_address() returns the underlying <b>BIO_ADDR</b> of the given <b>BIO_ADDRINFO</b>.</p>

<p>BIO_ADDRINFO_next() returns the next <b>BIO_ADDRINFO</b> in the chain from the given one.</p>

<p>BIO_ADDRINFO_free() frees the chain of <b>BIO_ADDRINFO</b> starting with the given one. If the argument is NULL, nothing is done.</p>

<h1 id="RETURN-VALUES">RETURN VALUES</h1>

<p>BIO_lookup_ex() and BIO_lookup() return 1 on success and 0 when an error occurred, and will leave an error indication on the OpenSSL error stack in that case.</p>

<p>All other functions described here return 0 or <b>NULL</b> when the information they should return isn&#39;t available.</p>

<h1 id="NOTES">NOTES</h1>

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

<h1 id="HISTORY">HISTORY</h1>

<p>The BIO_lookup_ex() function was added in OpenSSL 1.1.1.</p>

<h1 id="COPYRIGHT">COPYRIGHT</h1>

<p>Copyright 2016-2024 The OpenSSL Project Authors. All Rights Reserved.</p>

<p>Licensed under the Apache License 2.0 (the &quot;License&quot;). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p>


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