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diff --git a/lib/lwres/man/lwres_getaddrinfo.docbook b/lib/lwres/man/lwres_getaddrinfo.docbook new file mode 100644 index 0000000..bfe649a --- /dev/null +++ b/lib/lwres/man/lwres_getaddrinfo.docbook @@ -0,0 +1,381 @@ +<!DOCTYPE book [ +<!ENTITY mdash "—">]> +<!-- + - Copyright (C) Internet Systems Consortium, Inc. ("ISC") + - + - This Source Code Form is subject to the terms of the Mozilla Public + - License, v. 2.0. If a copy of the MPL was not distributed with this + - file, You can obtain one at http://mozilla.org/MPL/2.0/. + - + - See the COPYRIGHT file distributed with this work for additional + - information regarding copyright ownership. +--> + +<!-- Converted by db4-upgrade version 1.0 --> +<refentry xmlns:db="http://docbook.org/ns/docbook" version="5.0"> + <info> + <date>2007-06-18</date> + </info> + <refentryinfo> + <corpname>ISC</corpname> + <corpauthor>Internet Systems Consortium, Inc.</corpauthor> + </refentryinfo> + + <refmeta> + <refentrytitle>lwres_getaddrinfo</refentrytitle> + <manvolnum>3</manvolnum> + <refmiscinfo>BIND9</refmiscinfo> + </refmeta> + + <docinfo> + <copyright> + <year>2000</year> + <year>2001</year> + <year>2003</year> + <year>2004</year> + <year>2005</year> + <year>2007</year> + <year>2014</year> + <year>2015</year> + <year>2016</year> + <year>2018</year> + <year>2019</year> + <holder>Internet Systems Consortium, Inc. ("ISC")</holder> + </copyright> + </docinfo> + + <refnamediv> + <refname>lwres_getaddrinfo</refname> + <refname>lwres_freeaddrinfo</refname> + <refpurpose>socket address structure to host and service name</refpurpose> + </refnamediv> + <refsynopsisdiv> + <funcsynopsis> +<funcsynopsisinfo>#include <lwres/netdb.h></funcsynopsisinfo> +<funcprototype> + <funcdef> +int +<function>lwres_getaddrinfo</function></funcdef> + <paramdef>const char *<parameter>hostname</parameter></paramdef> + <paramdef>const char *<parameter>servname</parameter></paramdef> + <paramdef>const struct addrinfo *<parameter>hints</parameter></paramdef> + <paramdef>struct addrinfo **<parameter>res</parameter></paramdef> + </funcprototype> +<funcprototype> + <funcdef> +void +<function>lwres_freeaddrinfo</function></funcdef> + <paramdef>struct addrinfo *<parameter>ai</parameter></paramdef> + </funcprototype> +</funcsynopsis> + + <para> + If the operating system does not provide a + <type>struct addrinfo</type>, + the following structure is used: + </para> + <para><programlisting> +struct addrinfo { + int ai_flags; /* AI_PASSIVE, AI_CANONNAME */ + int ai_family; /* PF_xxx */ + int ai_socktype; /* SOCK_xxx */ + int ai_protocol; /* 0 or IPPROTO_xxx for IPv4 and IPv6 */ + size_t ai_addrlen; /* length of ai_addr */ + char *ai_canonname; /* canonical name for hostname */ + struct sockaddr *ai_addr; /* binary address */ + struct addrinfo *ai_next; /* next structure in linked list */ +}; +</programlisting> + </para> + + </refsynopsisdiv> + + <refsection><info><title>DESCRIPTION</title></info> + + + <para><function>lwres_getaddrinfo()</function> + is used to get a list of IP addresses and port numbers for host + <parameter>hostname</parameter> and service + <parameter>servname</parameter>. + + The function is the lightweight resolver's implementation of + <function>getaddrinfo()</function> as defined in RFC2133. + <parameter>hostname</parameter> and + <parameter>servname</parameter> are pointers to null-terminated + strings or <type>NULL</type>. + + <parameter>hostname</parameter> is either a host name or a + numeric host address string: a dotted decimal IPv4 address or an + IPv6 address. <parameter>servname</parameter> is either a + decimal port number or a service name as listed in + <filename>/etc/services</filename>. + </para> + + <para><parameter>hints</parameter> + is an optional pointer to a + <type>struct addrinfo</type>. + This structure can be used to provide hints concerning the type of + socket + that the caller supports or wishes to use. + The caller can supply the following structure elements in + <parameter>*hints</parameter>: + + <variablelist> + <varlistentry> + <term><constant>ai_family</constant></term> + <listitem> + <para> + The protocol family that should be used. + When + <constant>ai_family</constant> + is set to + <type>PF_UNSPEC</type>, + it means the caller will accept any protocol family supported by + the + operating system. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term><constant>ai_socktype</constant></term> + <listitem> + <para> + denotes the type of socket — + <type>SOCK_STREAM</type>, + <type>SOCK_DGRAM</type> + or + <type>SOCK_RAW</type> + — that is wanted. + When + <constant>ai_socktype</constant> + is zero the caller will accept any socket type. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term><constant>ai_protocol</constant></term> + <listitem> + <para> + indicates which transport protocol is wanted: IPPROTO_UDP or + IPPROTO_TCP. + If + <constant>ai_protocol</constant> + is zero the caller will accept any protocol. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term><constant>ai_flags</constant></term> + <listitem> + <para> + Flag bits. + If the + <type>AI_CANONNAME</type> + bit is set, a successful call to + <function>lwres_getaddrinfo()</function> + will return a null-terminated string containing the canonical + name + of the specified hostname in + <constant>ai_canonname</constant> + of the first + <type>addrinfo</type> + structure returned. + Setting the + <type>AI_PASSIVE</type> + bit indicates that the returned socket address structure is + intended + for used in a call to + <citerefentry> + <refentrytitle>bind</refentrytitle><manvolnum>2</manvolnum> + </citerefentry>. + + In this case, if the hostname argument is a + <type>NULL</type> + pointer, then the IP address portion of the socket + address structure will be set to + <type>INADDR_ANY</type> + for an IPv4 address or + <type>IN6ADDR_ANY_INIT</type> + for an IPv6 address. + </para> + <para> + When + <constant>ai_flags</constant> + does not set the + <type>AI_PASSIVE</type> + bit, the returned socket address structure will be ready + for use in a call to + <citerefentry> + <refentrytitle>connect</refentrytitle><manvolnum>2</manvolnum> + </citerefentry> + for a connection-oriented protocol or + <citerefentry> + <refentrytitle>connect</refentrytitle><manvolnum>2</manvolnum> + </citerefentry>, + + <citerefentry> + <refentrytitle>sendto</refentrytitle><manvolnum>2</manvolnum> + </citerefentry>, + + or + <citerefentry> + <refentrytitle>sendmsg</refentrytitle><manvolnum>2</manvolnum> + </citerefentry> + if a connectionless protocol was chosen. + The IP address portion of the socket address structure will be + set to the loopback address if + <parameter>hostname</parameter> + is a + <type>NULL</type> + pointer and + <type>AI_PASSIVE</type> + is not set in + <constant>ai_flags</constant>. + </para> + <para> + If + <constant>ai_flags</constant> + is set to + <type>AI_NUMERICHOST</type> + it indicates that + <parameter>hostname</parameter> + should be treated as a numeric string defining an IPv4 or IPv6 + address + and no name resolution should be attempted. + </para> + </listitem> + </varlistentry> + </variablelist> + </para> + + <para> + All other elements of the <type>struct addrinfo</type> passed + via <parameter>hints</parameter> must be zero. + </para> + + <para> + A <parameter>hints</parameter> of <type>NULL</type> is + treated as if + the caller provided a <type>struct addrinfo</type> initialized to zero + with <constant>ai_family</constant>set to + <constant>PF_UNSPEC</constant>. + </para> + + <para> + After a successful call to + <function>lwres_getaddrinfo()</function>, + <parameter>*res</parameter> + is a pointer to a linked list of one or more + <type>addrinfo</type> + structures. + Each + <type>struct addrinfo</type> + in this list cn be processed by following + the + <constant>ai_next</constant> + pointer, until a + <type>NULL</type> + pointer is encountered. + The three members + <constant>ai_family</constant>, + <constant>ai_socktype</constant>, + and + <constant>ai_protocol</constant> + in each + returned + <type>addrinfo</type> + structure contain the corresponding arguments for a call to + <citerefentry> + <refentrytitle>socket</refentrytitle><manvolnum>2</manvolnum> + </citerefentry>. + For each + <type>addrinfo</type> + structure in the list, the + <constant>ai_addr</constant> + member points to a filled-in socket address structure of length + <constant>ai_addrlen</constant>. + </para> + + <para> + All of the information returned by + <function>lwres_getaddrinfo()</function> + is dynamically allocated: the addrinfo structures, and the socket + address structures and canonical host name strings pointed to by the + <constant>addrinfo</constant>structures. + Memory allocated for the dynamically allocated structures created by + a successful call to + <function>lwres_getaddrinfo()</function> + is released by + <function>lwres_freeaddrinfo()</function>. + <parameter>ai</parameter> + is a pointer to a + <type>struct addrinfo</type> + created by a call to + <function>lwres_getaddrinfo()</function>. + </para> + + </refsection> + + <refsection><info><title>RETURN VALUES</title></info> + + + <para><function>lwres_getaddrinfo()</function> + returns zero on success or one of the error codes listed in + <citerefentry> + <refentrytitle>gai_strerror</refentrytitle><manvolnum>3</manvolnum> + </citerefentry> + if an error occurs. If both <parameter>hostname</parameter> and + <parameter>servname</parameter> are <type>NULL</type> + <function>lwres_getaddrinfo()</function> returns + <errorcode>EAI_NONAME</errorcode>. + </para> + </refsection> + <refsection><info><title>SEE ALSO</title></info> + + <para><citerefentry> + <refentrytitle>lwres</refentrytitle><manvolnum>3</manvolnum> + </citerefentry>, + + <citerefentry> + <refentrytitle>lwres_getaddrinfo</refentrytitle><manvolnum>3</manvolnum> + </citerefentry>, + + <citerefentry> + <refentrytitle>lwres_freeaddrinfo</refentrytitle><manvolnum>3</manvolnum> + </citerefentry>, + + <citerefentry> + <refentrytitle>lwres_gai_strerror</refentrytitle><manvolnum>3</manvolnum> + </citerefentry>, + + <citerefentry> + <refentrytitle>RFC2133</refentrytitle> + </citerefentry>, + + <citerefentry> + <refentrytitle>getservbyname</refentrytitle><manvolnum>3</manvolnum> + </citerefentry>, + + <citerefentry> + <refentrytitle>bind</refentrytitle><manvolnum>2</manvolnum> + </citerefentry>, + + <citerefentry> + <refentrytitle>connect</refentrytitle><manvolnum>2</manvolnum> + </citerefentry>, + + <citerefentry> + <refentrytitle>sendto</refentrytitle><manvolnum>2</manvolnum> + </citerefentry>, + + <citerefentry> + <refentrytitle>sendmsg</refentrytitle><manvolnum>2</manvolnum> + </citerefentry>, + + <citerefentry> + <refentrytitle>socket</refentrytitle><manvolnum>2</manvolnum> + </citerefentry>. + </para> + + </refsection> +</refentry> |