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BIO_ADDRINFO_next.3
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" 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 .SH "SYNOPSIS" .IX 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 *node, 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 .SH "DESCRIPTION" .IX Header "DESCRIPTION" The \fB\s-1BIO_ADDRINFO\s0\fR type is a wrapper for address information types provided on your platform. .PP \&\fB\s-1BIO_ADDRINFO\s0\fR normally forms a chain of several that can be picked at one by one. .PP \&\fBBIO_lookup_ex()\fR looks up a specified \fBhost\fR and \fBservice\fR, and uses \fBlookup_type\fR to determine what the default address should be if \fBhost\fR is \fB\s-1NULL\s0\fR. \fBfamily\fR, \fBsocktype\fR and \fBprotocol\fR are used to determine what protocol family, socket type and protocol should be used for the lookup. \fBfamily\fR can be any of \s-1AF_INET, AF_INET6, AF_UNIX\s0 and \&\s-1AF_UNSPEC.\s0 \fBsocktype\fR can be \s-1SOCK_STREAM, SOCK_DGRAM\s0 or 0. Specifying 0 indicates that any type can be used. \fBprotocol\fR 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. \fBres\fR points at a pointer to hold the start of a \fB\s-1BIO_ADDRINFO\s0\fR chain. .PP For the family \fB\s-1AF_UNIX\s0\fR, \fBBIO_lookup_ex()\fR will ignore the \fBservice\fR parameter and expects the \fBnode\fR parameter to hold the path to the socket file. .PP \&\fBBIO_lookup()\fR does the same as \fBBIO_lookup_ex()\fR but does not provide the ability to select based on the protocol (any protocol may be returned). .PP \&\fBBIO_ADDRINFO_family()\fR returns the family of the given \&\fB\s-1BIO_ADDRINFO\s0\fR. The result will be one of the constants \&\s-1AF_INET, AF_INET6\s0 and \s-1AF_UNIX.\s0 .PP \&\fBBIO_ADDRINFO_socktype()\fR returns the socket type of the given \&\fB\s-1BIO_ADDRINFO\s0\fR. The result will be one of the constants \&\s-1SOCK_STREAM\s0 and \s-1SOCK_DGRAM.\s0 .PP \&\fBBIO_ADDRINFO_protocol()\fR returns the protocol id of the given \&\fB\s-1BIO_ADDRINFO\s0\fR. The result will be one of the constants \&\s-1IPPROTO_TCP\s0 and \s-1IPPROTO_UDP.\s0 .PP \&\fBBIO_ADDRINFO_address()\fR returns the underlying \fB\s-1BIO_ADDR\s0\fR of the given \fB\s-1BIO_ADDRINFO\s0\fR. .PP \&\fBBIO_ADDRINFO_next()\fR returns the next \fB\s-1BIO_ADDRINFO\s0\fR in the chain from the given one. .PP \&\fBBIO_ADDRINFO_free()\fR frees the chain of \fB\s-1BIO_ADDRINFO\s0\fR starting with the given one. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBBIO_lookup_ex()\fR and \fBBIO_lookup()\fR return 1 on success and 0 when an error occurred, and will leave an error indication on the OpenSSL error stack in that case. .PP All other functions described here return 0 or \fB\s-1NULL\s0\fR when the information they should return isn't available. .SH "NOTES" .IX Header "NOTES" The \fBBIO_lookup_ex()\fR implementation uses the platform provided \fBgetaddrinfo()\fR function. On Linux it is known that specifying 0 for the protocol will not return any \s-1SCTP\s0 based addresses when calling \fBgetaddrinfo()\fR. Therefore, if an \s-1SCTP\s0 address is required then the \fBprotocol\fR parameter to \fBBIO_lookup_ex()\fR should be explicitly set to \s-1IPPROTO_SCTP.\s0 The same may be true on other platforms. .SH "HISTORY" .IX Header "HISTORY" The \fBBIO_lookup_ex()\fR function was added in OpenSSL 1.1.1. .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2016\-2020 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (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>.
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