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129 .\" ========================================================================
131 .IX Title "BIO_ADDRINFO 3"
132 .TH BIO_ADDRINFO 3 "2018-09-11" "1.1.1" "OpenSSL"
133 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
134 .\" way too many mistakes in technical documents.
138 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
140 .IX Header "SYNOPSIS"
142 \& #include <sys/types.h>
143 \& #include <openssl/bio.h>
145 \& typedef union bio_addrinfo_st BIO_ADDRINFO;
147 \& enum BIO_lookup_type {
148 \& BIO_LOOKUP_CLIENT, BIO_LOOKUP_SERVER
151 \& int BIO_lookup_ex(const char *host, const char *service, int lookup_type,
152 \& int family, int socktype, int protocol, BIO_ADDRINFO **res);
153 \& int BIO_lookup(const char *node, const char *service,
154 \& enum BIO_lookup_type lookup_type,
155 \& int family, int socktype, BIO_ADDRINFO **res);
157 \& const BIO_ADDRINFO *BIO_ADDRINFO_next(const BIO_ADDRINFO *bai);
158 \& int BIO_ADDRINFO_family(const BIO_ADDRINFO *bai);
159 \& int BIO_ADDRINFO_socktype(const BIO_ADDRINFO *bai);
160 \& int BIO_ADDRINFO_protocol(const BIO_ADDRINFO *bai);
161 \& const BIO_ADDR *BIO_ADDRINFO_address(const BIO_ADDRINFO *bai);
162 \& void BIO_ADDRINFO_free(BIO_ADDRINFO *bai);
165 .IX Header "DESCRIPTION"
166 The \fB\s-1BIO_ADDRINFO\s0\fR type is a wrapper for address information
167 types provided on your platform.
169 \&\fB\s-1BIO_ADDRINFO\s0\fR normally forms a chain of several that can be
170 picked at one by one.
172 \&\fIBIO_lookup_ex()\fR looks up a specified \fBhost\fR and \fBservice\fR, and
173 uses \fBlookup_type\fR to determine what the default address should
174 be if \fBhost\fR is \fB\s-1NULL\s0\fR. \fBfamily\fR, \fBsocktype\fR and \fBprotocol\fR are used to
175 determine what protocol family, socket type and protocol should be used for
176 the lookup. \fBfamily\fR can be any of \s-1AF_INET, AF_INET6, AF_UNIX\s0 and
177 \&\s-1AF_UNSPEC.\s0 \fBsocktype\fR can be \s-1SOCK_STREAM, SOCK_DGRAM\s0 or 0. Specifying 0
178 indicates that any type can be used. \fBprotocol\fR specifies a protocol such as
179 \&\s-1IPPROTO_TCP, IPPROTO_UDP\s0 or \s-1IPPORTO_SCTP.\s0 If set to 0 than any protocol can be
180 used. \fBres\fR points at a pointer to hold the start of a \fB\s-1BIO_ADDRINFO\s0\fR
183 For the family \fB\s-1AF_UNIX\s0\fR, \fIBIO_lookup_ex()\fR will ignore the \fBservice\fR
184 parameter and expects the \fBnode\fR parameter to hold the path to the
187 \&\fIBIO_lookup()\fR does the same as \fIBIO_lookup_ex()\fR but does not provide the ability
188 to select based on the protocol (any protocol may be returned).
190 \&\fIBIO_ADDRINFO_family()\fR returns the family of the given
191 \&\fB\s-1BIO_ADDRINFO\s0\fR. The result will be one of the constants
192 \&\s-1AF_INET, AF_INET6\s0 and \s-1AF_UNIX.\s0
194 \&\fIBIO_ADDRINFO_socktype()\fR returns the socket type of the given
195 \&\fB\s-1BIO_ADDRINFO\s0\fR. The result will be one of the constants
196 \&\s-1SOCK_STREAM\s0 and \s-1SOCK_DGRAM.\s0
198 \&\fIBIO_ADDRINFO_protocol()\fR returns the protocol id of the given
199 \&\fB\s-1BIO_ADDRINFO\s0\fR. The result will be one of the constants
200 \&\s-1IPPROTO_TCP\s0 and \s-1IPPROTO_UDP.\s0
202 \&\fIBIO_ADDRINFO_address()\fR returns the underlying \fB\s-1BIO_ADDR\s0\fR
203 of the given \fB\s-1BIO_ADDRINFO\s0\fR.
205 \&\fIBIO_ADDRINFO_next()\fR returns the next \fB\s-1BIO_ADDRINFO\s0\fR in the chain
208 \&\fIBIO_ADDRINFO_free()\fR frees the chain of \fB\s-1BIO_ADDRINFO\s0\fR starting
211 .IX Header "RETURN VALUES"
212 \&\fIBIO_lookup_ex()\fR and \fIBIO_lookup()\fR return 1 on success and 0 when an error
213 occurred, and will leave an error indication on the OpenSSL error stack in that
216 All other functions described here return 0 or \fB\s-1NULL\s0\fR when the
217 information they should return isn't available.
220 The \fIBIO_lookup_ex()\fR implementation uses the platform provided \fIgetaddrinfo()\fR
221 function. On Linux it is known that specifying 0 for the protocol will not
222 return any \s-1SCTP\s0 based addresses when calling \fIgetaddrinfo()\fR. Therefore if an \s-1SCTP\s0
223 address is required then the \fBprotocol\fR parameter to \fIBIO_lookup_ex()\fR should be
224 explicitly set to \s-1IPPROTO_SCTP.\s0 The same may be true on other platforms.
227 The \fIBIO_lookup_ex()\fR function was added in OpenSSL 1.1.1.
229 .IX Header "COPYRIGHT"
230 Copyright 2016\-2017 The OpenSSL Project Authors. All Rights Reserved.
232 Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use
233 this file except in compliance with the License. You can obtain a copy
234 in the file \s-1LICENSE\s0 in the source distribution or at
235 <https://www.openssl.org/source/license.html>.