499 lines
14 KiB
Groff
499 lines
14 KiB
Groff
.TH "event2/dns_compat.h" 3 "Wed Apr 10 2013" "libevent" \" -*- nroff -*-
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.ad l
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.nh
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.SH NAME
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event2/dns_compat.h \-
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.PP
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Potentially non-threadsafe versions of the functions in \fBdns\&.h\fP: provided only for backwards compatibility\&.
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.SH SYNOPSIS
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.br
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.PP
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\fC#include <event2/event-config\&.h>\fP
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.br
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\fC#include <event2/util\&.h>\fP
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.br
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.SS "Functions"
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.in +1c
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.ti -1c
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.RI "struct evdns_server_port * \fBevdns_add_server_port\fP (\fBevutil_socket_t\fP socket, int flags, \fBevdns_request_callback_fn_type\fP callback, void *user_data)"
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.br
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.RI "\fIAs evdns_server_new_with_base\&. \fP"
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.ti -1c
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.RI "int \fBevdns_clear_nameservers_and_suspend\fP (void)"
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.br
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.RI "\fIRemove all configured nameservers, and suspend all pending resolves\&. \fP"
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.ti -1c
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.RI "int \fBevdns_count_nameservers\fP (void)"
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.br
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.RI "\fIGet the number of configured nameservers\&. \fP"
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.ti -1c
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.RI "struct evdns_base * \fBevdns_get_global_base\fP (void)"
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.br
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.RI "\fIReturn the global evdns_base created by \fBevent_init()\fP and used by the other deprecated functions\&. \fP"
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.ti -1c
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.RI "int \fBevdns_init\fP (void)"
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.br
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.RI "\fIInitialize the asynchronous DNS library\&. \fP"
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.ti -1c
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.RI "int \fBevdns_nameserver_add\fP (unsigned long int address)"
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.br
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.RI "\fIAdd a nameserver\&. \fP"
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.ti -1c
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.RI "int \fBevdns_nameserver_ip_add\fP (const char *ip_as_string)"
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.br
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.RI "\fIAdd a nameserver\&. \fP"
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.ti -1c
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.RI "int \fBevdns_resolv_conf_parse\fP (int flags, const char *const filename)"
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.br
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.RI "\fIParse a resolv\&.conf file\&. \fP"
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.ti -1c
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.RI "int \fBevdns_resolve_ipv4\fP (const char *name, int flags, \fBevdns_callback_type\fP callback, void *ptr)"
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.br
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.RI "\fILookup an A record for a given name\&. \fP"
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.ti -1c
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.RI "int \fBevdns_resolve_ipv6\fP (const char *name, int flags, \fBevdns_callback_type\fP callback, void *ptr)"
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.br
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.RI "\fILookup an AAAA record for a given name\&. \fP"
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.ti -1c
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.RI "int \fBevdns_resolve_reverse\fP (const struct in_addr *in, int flags, \fBevdns_callback_type\fP callback, void *ptr)"
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.br
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.RI "\fILookup a PTR record for a given IP address\&. \fP"
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.ti -1c
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.RI "int \fBevdns_resolve_reverse_ipv6\fP (const struct in6_addr *in, int flags, \fBevdns_callback_type\fP callback, void *ptr)"
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.br
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.RI "\fILookup a PTR record for a given IPv6 address\&. \fP"
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.ti -1c
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.RI "int \fBevdns_resume\fP (void)"
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.br
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.RI "\fIResume normal operation and continue any suspended resolve requests\&. \fP"
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.ti -1c
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.RI "void \fBevdns_search_add\fP (const char *domain)"
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.br
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.RI "\fIAdd a domain to the list of search domains\&. \fP"
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.ti -1c
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.RI "void \fBevdns_search_clear\fP (void)"
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.br
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.RI "\fIClear the list of search domains\&. \fP"
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.ti -1c
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.RI "void \fBevdns_search_ndots_set\fP (const int ndots)"
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.br
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.RI "\fISet the 'ndots' parameter for searches\&. \fP"
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.ti -1c
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.RI "int \fBevdns_set_option\fP (const char *option, const char *val, int flags)"
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.br
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.RI "\fISet the value of a configuration option\&. \fP"
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.ti -1c
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.RI "void \fBevdns_shutdown\fP (int fail_requests)"
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.br
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.RI "\fIShut down the asynchronous DNS resolver and terminate all active requests\&. \fP"
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.in -1c
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.SH "Detailed Description"
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.PP
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Potentially non-threadsafe versions of the functions in \fBdns\&.h\fP: provided only for backwards compatibility\&.
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.SH "Function Documentation"
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.PP
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.SS "struct evdns_server_port* evdns_add_server_port (\fBevutil_socket_t\fPsocket, intflags, \fBevdns_request_callback_fn_type\fPcallback, void *user_data)\fC [read]\fP"
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.PP
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As evdns_server_new_with_base\&. \fBDeprecated\fP
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.RS 4
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This function is deprecated because it does not allow the caller to specify which even_base it uses\&. The recommended function is \fBevdns_add_server_port_with_base()\fP\&.
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.RE
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.PP
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.SS "int evdns_clear_nameservers_and_suspend (void)"
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.PP
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Remove all configured nameservers, and suspend all pending resolves\&. Resolves will not necessarily be re-attempted until \fBevdns_resume()\fP is called\&.
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.PP
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\fBDeprecated\fP
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.RS 4
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This function is deprecated because it does not allow the caller to specify which evdns_base it applies to\&. The recommended function is \fBevdns_base_clear_nameservers_and_suspend()\fP\&.
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.RE
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.PP
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.PP
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\fBReturns:\fP
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.RS 4
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0 if successful, or -1 if an error occurred
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.RE
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.PP
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\fBSee Also:\fP
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.RS 4
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\fBevdns_resume()\fP
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.RE
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.PP
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.SS "int evdns_count_nameservers (void)"
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.PP
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Get the number of configured nameservers\&. This returns the number of configured nameservers (not necessarily the number of running nameservers)\&. This is useful for double-checking whether our calls to the various nameserver configuration functions have been successful\&.
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.PP
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\fBDeprecated\fP
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.RS 4
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This function is deprecated because it does not allow the caller to specify which evdns_base it applies to\&. The recommended function is \fBevdns_base_count_nameservers()\fP\&.
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.RE
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.PP
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.PP
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\fBReturns:\fP
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.RS 4
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the number of configured nameservers
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.RE
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.PP
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\fBSee Also:\fP
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.RS 4
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\fBevdns_nameserver_add()\fP
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.RE
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.PP
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.SS "struct evdns_base* evdns_get_global_base (void)\fC [read]\fP"
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.PP
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Return the global evdns_base created by \fBevent_init()\fP and used by the other deprecated functions\&. \fBDeprecated\fP
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.RS 4
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This function is deprecated because use of the global evdns_base is error-prone\&.
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.RE
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.PP
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.SS "int evdns_init (void)"
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.PP
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Initialize the asynchronous DNS library\&. This function initializes support for non-blocking name resolution by calling \fBevdns_resolv_conf_parse()\fP on UNIX and evdns_config_windows_nameservers() on Windows\&.
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.PP
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\fBDeprecated\fP
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.RS 4
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This function is deprecated because it always uses the current event base, and is easily confused by multiple calls to \fBevent_init()\fP, and so is not safe for multithreaded use\&. Additionally, it allocates a global structure that only one thread can use\&. The replacement is \fBevdns_base_new()\fP\&.
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.RE
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.PP
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.PP
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\fBReturns:\fP
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.RS 4
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0 if successful, or -1 if an error occurred
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.RE
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.PP
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\fBSee Also:\fP
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.RS 4
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\fBevdns_shutdown()\fP
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.RE
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.PP
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.SS "int evdns_nameserver_add (unsigned long intaddress)"
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.PP
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Add a nameserver\&. The address should be an IPv4 address in network byte order\&. The type of address is chosen so that it matches in_addr\&.s_addr\&.
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.PP
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\fBDeprecated\fP
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.RS 4
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This function is deprecated because it does not allow the caller to specify which evdns_base it applies to\&. The recommended function is \fBevdns_base_nameserver_add()\fP\&.
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.RE
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.PP
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.PP
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\fBParameters:\fP
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.RS 4
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\fIaddress\fP an IP address in network byte order
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.RE
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.PP
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\fBReturns:\fP
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.RS 4
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0 if successful, or -1 if an error occurred
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.RE
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.PP
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\fBSee Also:\fP
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.RS 4
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\fBevdns_nameserver_ip_add()\fP
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.RE
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.PP
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.SS "int evdns_nameserver_ip_add (const char *ip_as_string)"
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.PP
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Add a nameserver\&. This wraps the \fBevdns_nameserver_add()\fP function by parsing a string as an IP address and adds it as a nameserver\&.
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.PP
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\fBDeprecated\fP
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.RS 4
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This function is deprecated because it does not allow the caller to specify which evdns_base it applies to\&. The recommended function is \fBevdns_base_nameserver_ip_add()\fP\&.
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.RE
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.PP
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.PP
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\fBReturns:\fP
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.RS 4
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0 if successful, or -1 if an error occurred
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.RE
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.PP
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\fBSee Also:\fP
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.RS 4
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\fBevdns_nameserver_add()\fP
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.RE
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.PP
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.SS "int evdns_resolv_conf_parse (intflags, const char *constfilename)"
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.PP
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Parse a resolv\&.conf file\&. The 'flags' parameter determines what information is parsed from the resolv\&.conf file\&. See the man page for resolv\&.conf for the format of this file\&.
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.PP
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The following directives are not parsed from the file: sortlist, rotate, no-check-names, inet6, debug\&.
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.PP
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If this function encounters an error, the possible return values are: 1 = failed to open file, 2 = failed to stat file, 3 = file too large, 4 = out of memory, 5 = short read from file, 6 = no nameservers listed in the file
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.PP
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\fBDeprecated\fP
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.RS 4
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This function is deprecated because it does not allow the caller to specify which evdns_base it applies to\&. The recommended function is \fBevdns_base_resolv_conf_parse()\fP\&.
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.RE
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.PP
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.PP
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\fBParameters:\fP
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.RS 4
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\fIflags\fP any of DNS_OPTION_NAMESERVERS|DNS_OPTION_SEARCH|DNS_OPTION_MISC| DNS_OPTIONS_ALL
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.br
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\fIfilename\fP the path to the resolv\&.conf file
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.RE
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.PP
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\fBReturns:\fP
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.RS 4
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0 if successful, or various positive error codes if an error occurred (see above)
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.RE
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.PP
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\fBSee Also:\fP
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.RS 4
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resolv\&.conf(3), evdns_config_windows_nameservers()
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.RE
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.PP
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.SS "int evdns_resolve_ipv4 (const char *name, intflags, \fBevdns_callback_type\fPcallback, void *ptr)"
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.PP
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Lookup an A record for a given name\&. \fBDeprecated\fP
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.RS 4
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This function is deprecated because it does not allow the caller to specify which evdns_base it applies to\&. The recommended function is \fBevdns_base_resolve_ipv4()\fP\&.
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.RE
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.PP
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.PP
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\fBParameters:\fP
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.RS 4
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\fIname\fP a DNS hostname
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.br
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\fIflags\fP either 0, or DNS_QUERY_NO_SEARCH to disable searching for this query\&.
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.br
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\fIcallback\fP a callback function to invoke when the request is completed
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.br
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\fIptr\fP an argument to pass to the callback function
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.RE
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.PP
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\fBReturns:\fP
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.RS 4
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0 if successful, or -1 if an error occurred
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.RE
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.PP
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\fBSee Also:\fP
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.RS 4
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\fBevdns_resolve_ipv6()\fP, \fBevdns_resolve_reverse()\fP, \fBevdns_resolve_reverse_ipv6()\fP
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.RE
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.PP
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.SS "int evdns_resolve_ipv6 (const char *name, intflags, \fBevdns_callback_type\fPcallback, void *ptr)"
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.PP
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Lookup an AAAA record for a given name\&. \fBParameters:\fP
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.RS 4
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\fIname\fP a DNS hostname
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.br
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\fIflags\fP either 0, or DNS_QUERY_NO_SEARCH to disable searching for this query\&.
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.br
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\fIcallback\fP a callback function to invoke when the request is completed
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.br
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\fIptr\fP an argument to pass to the callback function
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.RE
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.PP
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\fBReturns:\fP
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.RS 4
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0 if successful, or -1 if an error occurred
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.RE
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.PP
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\fBSee Also:\fP
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.RS 4
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\fBevdns_resolve_ipv4()\fP, \fBevdns_resolve_reverse()\fP, \fBevdns_resolve_reverse_ipv6()\fP
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.RE
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.PP
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.SS "int evdns_resolve_reverse (const struct in_addr *in, intflags, \fBevdns_callback_type\fPcallback, void *ptr)"
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.PP
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Lookup a PTR record for a given IP address\&. \fBDeprecated\fP
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.RS 4
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This function is deprecated because it does not allow the caller to specify which evdns_base it applies to\&. The recommended function is \fBevdns_base_resolve_reverse()\fP\&.
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.RE
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.PP
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.PP
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\fBParameters:\fP
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.RS 4
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\fIin\fP an IPv4 address
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.br
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\fIflags\fP either 0, or DNS_QUERY_NO_SEARCH to disable searching for this query\&.
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.br
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\fIcallback\fP a callback function to invoke when the request is completed
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.br
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\fIptr\fP an argument to pass to the callback function
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.RE
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.PP
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\fBReturns:\fP
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.RS 4
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0 if successful, or -1 if an error occurred
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.RE
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.PP
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\fBSee Also:\fP
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.RS 4
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\fBevdns_resolve_reverse_ipv6()\fP
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.RE
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.PP
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.SS "int evdns_resolve_reverse_ipv6 (const struct in6_addr *in, intflags, \fBevdns_callback_type\fPcallback, void *ptr)"
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.PP
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Lookup a PTR record for a given IPv6 address\&. \fBDeprecated\fP
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.RS 4
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This function is deprecated because it does not allow the caller to specify which evdns_base it applies to\&. The recommended function is \fBevdns_base_resolve_reverse_ipv6()\fP\&.
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.RE
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.PP
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.PP
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\fBParameters:\fP
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.RS 4
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\fIin\fP an IPv6 address
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.br
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\fIflags\fP either 0, or DNS_QUERY_NO_SEARCH to disable searching for this query\&.
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.br
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\fIcallback\fP a callback function to invoke when the request is completed
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.br
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\fIptr\fP an argument to pass to the callback function
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.RE
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.PP
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\fBReturns:\fP
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.RS 4
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0 if successful, or -1 if an error occurred
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.RE
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.PP
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\fBSee Also:\fP
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.RS 4
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\fBevdns_resolve_reverse_ipv6()\fP
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.RE
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.PP
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.SS "int evdns_resume (void)"
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.PP
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Resume normal operation and continue any suspended resolve requests\&. Re-attempt resolves left in limbo after an earlier call to \fBevdns_clear_nameservers_and_suspend()\fP\&.
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.PP
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\fBDeprecated\fP
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.RS 4
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This function is deprecated because it does not allow the caller to specify which evdns_base it applies to\&. The recommended function is \fBevdns_base_resume()\fP\&.
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.RE
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.PP
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.PP
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\fBReturns:\fP
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.RS 4
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0 if successful, or -1 if an error occurred
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.RE
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.PP
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\fBSee Also:\fP
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.RS 4
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\fBevdns_clear_nameservers_and_suspend()\fP
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.RE
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.PP
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.SS "void evdns_search_add (const char *domain)"
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.PP
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Add a domain to the list of search domains\&. \fBDeprecated\fP
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.RS 4
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This function is deprecated because it does not allow the caller to specify which evdns_base it applies to\&. The recommended function is \fBevdns_base_search_add()\fP\&.
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.RE
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.PP
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.PP
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\fBParameters:\fP
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.RS 4
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\fIdomain\fP the domain to be added to the search list
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.RE
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.PP
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.SS "void evdns_search_clear (void)"
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.PP
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Clear the list of search domains\&. \fBDeprecated\fP
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.RS 4
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This function is deprecated because it does not allow the caller to specify which evdns_base it applies to\&. The recommended function is \fBevdns_base_search_clear()\fP\&.
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.RE
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.PP
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.SS "void evdns_search_ndots_set (const intndots)"
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.PP
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Set the 'ndots' parameter for searches\&. Sets the number of dots which, when found in a name, causes the first query to be without any search domain\&.
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.PP
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\fBDeprecated\fP
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.RS 4
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This function is deprecated because it does not allow the caller to specify which evdns_base it applies to\&. The recommended function is \fBevdns_base_search_ndots_set()\fP\&.
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.RE
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.PP
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.PP
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\fBParameters:\fP
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.RS 4
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\fIndots\fP the new ndots parameter
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.RE
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.PP
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.SS "int evdns_set_option (const char *option, const char *val, intflags)"
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.PP
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Set the value of a configuration option\&. The currently available configuration options are:
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.PP
|
|
ndots, timeout, max-timeouts, max-inflight, and attempts
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.PP
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|
\fBDeprecated\fP
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.RS 4
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|
This function is deprecated because it does not allow the caller to specify which evdns_base it applies to\&. The recommended function is \fBevdns_base_set_option()\fP\&.
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.RE
|
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.PP
|
|
.PP
|
|
\fBParameters:\fP
|
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.RS 4
|
|
\fIoption\fP the name of the configuration option to be modified
|
|
.br
|
|
\fIval\fP the value to be set
|
|
.br
|
|
\fIflags\fP Ignored\&.
|
|
.RE
|
|
.PP
|
|
\fBReturns:\fP
|
|
.RS 4
|
|
0 if successful, or -1 if an error occurred
|
|
.RE
|
|
.PP
|
|
|
|
.SS "void evdns_shutdown (intfail_requests)"
|
|
|
|
.PP
|
|
Shut down the asynchronous DNS resolver and terminate all active requests\&. If the 'fail_requests' option is enabled, all active requests will return an empty result with the error flag set to DNS_ERR_SHUTDOWN\&. Otherwise, the requests will be silently discarded\&.
|
|
.PP
|
|
\fBDeprecated\fP
|
|
.RS 4
|
|
This function is deprecated because it does not allow the caller to specify which evdns_base it applies to\&. The recommended function is evdns_base_shutdown()\&.
|
|
.RE
|
|
.PP
|
|
.PP
|
|
\fBParameters:\fP
|
|
.RS 4
|
|
\fIfail_requests\fP if zero, active requests will be aborted; if non-zero, active requests will return DNS_ERR_SHUTDOWN\&.
|
|
.RE
|
|
.PP
|
|
\fBSee Also:\fP
|
|
.RS 4
|
|
\fBevdns_init()\fP
|
|
.RE
|
|
.PP
|
|
|
|
.SH "Author"
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|
.PP
|
|
Generated automatically by Doxygen for libevent from the source code\&.
|