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Title "BIO_ADDRINFO 3ossl" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
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 Header "SYNOPSIS" .Vb 2 #include <sys/types.h> #include <openssl/bio.h> \& 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); .Ve Header "DESCRIPTION" The \s-1BIO_ADDRINFO\s0 type is a wrapper for address information types provided on your platform.

\fB\s-1BIO_ADDRINFO\s0 normally forms a chain of several that can be picked at one by one.

\fBBIO_lookup_ex() looks up a specified host and service, and uses lookup_type to determine what the default address should be if host is \s-1NULL\s0. family, socktype and protocol are used to determine what protocol family, socket type and protocol should be used for the lookup. family can be any of \s-1AF_INET, AF_INET6, AF_UNIX\s0 and \s-1AF_UNSPEC.\s0 socktype can be \s-1SOCK_STREAM, SOCK_DGRAM\s0 or 0. Specifying 0 indicates that any type can be used. protocol specifies a protocol such as \s-1IPPROTO_TCP, IPPROTO_UDP\s0 or \s-1IPPORTO_SCTP.\s0 If set to 0 than any protocol can be used. res points at a pointer to hold the start of a \s-1BIO_ADDRINFO\s0 chain.

For the family \s-1AF_UNIX\s0, BIO_lookup_ex() will ignore the service parameter and expects the host parameter to hold the path to the socket file.

\fBBIO_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).

\fBBIO_ADDRINFO_family() returns the family of the given \fB\s-1BIO_ADDRINFO\s0. The result will be one of the constants \s-1AF_INET, AF_INET6\s0 and \s-1AF_UNIX.\s0

\fBBIO_ADDRINFO_socktype() returns the socket type of the given \fB\s-1BIO_ADDRINFO\s0. The result will be one of the constants \s-1SOCK_STREAM\s0 and \s-1SOCK_DGRAM.\s0

\fBBIO_ADDRINFO_protocol() returns the protocol id of the given \fB\s-1BIO_ADDRINFO\s0. The result will be one of the constants \s-1IPPROTO_TCP\s0 and \s-1IPPROTO_UDP.\s0

\fBBIO_ADDRINFO_address() returns the underlying \s-1BIO_ADDR\s0 of the given \s-1BIO_ADDRINFO\s0.

\fBBIO_ADDRINFO_next() returns the next \s-1BIO_ADDRINFO\s0 in the chain from the given one.

\fBBIO_ADDRINFO_free() frees the chain of \s-1BIO_ADDRINFO\s0 starting with the given one.

Header "RETURN VALUES" \fBBIO_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.

All other functions described here return 0 or \s-1NULL\s0 when the information they should return isn't available.

Header "NOTES" 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 \s-1SCTP\s0 based addresses when calling getaddrinfo(). Therefore, if an \s-1SCTP\s0 address is required then the protocol parameter to BIO_lookup_ex() should be explicitly set to \s-1IPPROTO_SCTP.\s0 The same may be true on other platforms. Header "HISTORY" The BIO_lookup_ex() function was added in OpenSSL 1.1.1. Header "COPYRIGHT" Copyright 2016-2021 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.