68 Commits

Author SHA1 Message Date
Daniel Kempenich
a7fffb5c0f Replace magic numbers with consts for evdns_base_resolv_conf_parse() errors 2023-01-27 08:47:01 +01:00
Yongsheng Xu
cd6a41ecdd feat: add evdns_base_get_nameserver_fd method
To get underlying udp socket fd.
2021-12-10 11:05:13 +08:00
Azat Khuzhin
0c217f4fe1 Fix comment for evdns_base_new() 2021-11-22 00:05:27 +03:00
Sergey Matveychuk
19b3fd0bf0 evdns: add ability to get CNAME
Add new flag (DNS_CNAME_CALLBACK) for
evdns_base_resolve_ipv4()/evdns_base_resolve_ipv6().

If set, you will get one more callback with type == DNS_CNAME and CNAME
in addrs argument.
2021-05-24 21:03:45 +03:00
fanquake
01beec2fea
dns: remove evdns_set_transaction_id_fn 2021-04-03 12:55:32 +08:00
fanquake
39d680534a
dns: remove evdns_set_random_bytes_fn 2021-04-03 12:55:11 +08:00
chux0519
617ba83874 evdns: add max-probe-timeout/probe-backoff-factor settings
I recently found that when the network status changed when calling
bufferevent_socket_connect_hostname (e.g. switching between several
WIFIs), all DNS servers would fail, and the timeout of probe would be
very long if there were many DNS requests. I want libevent to support
manual setting of MAX_PROBE_TIMEOUT and TIMEOUT_BACKOFF_FACTOR

So move hardcoded MAX_PROBE_TIMEOUT and TIMEOUT_BACKOFF_FACTOR into
struct, and allow changing them.
2021-01-12 10:56:13 +03:00
seleznevae
83c58d4985 evdns: Add support for setting maximum UDP DNS message size.
Added new option `edns-udp-size` for evdns_base which allows
to control maximum allowed size of UDP DNS messages. This
maximum size is passed to the DNS server via edns mechanism.
2020-05-31 19:59:49 +03:00
ayuseleznev
0f6ee89a39 evdns: Implement dns requests via tcp 2020-05-21 12:46:20 +03:00
yuangongji
620a3fa1d5 Doxygen documentation improvements
- Documentation for `bufferevent_compat.h` and `rpc.h` is not generated
  since the `@file` command is missing. It can be fixed by adding
  `@file` in file comment block.
- The briefs of buffer.h,bufferevent.h and some other files are missing.
  Adding `@brief` command can fix it.
- The parameters in the function declaration are different from the
  parameters following the `@param` command.We should change them to the
  same.
- Documentation of `watch.h` is not generated since `watch.h` has not
  been added to the Doxyfile `INPUT` tag.

- Add link to the watch.h in event.h
2019-08-29 23:08:12 +03:00
Azat Khuzhin
538141eb7e
evdns: add new options -- so-rcvbuf/so-sndbuf
This will allow to customize SO_RCVBUF/SO_SNDBUF for nameservers in this
evdns_base, you may want to adjust them if the kernel starts dropping
udp packages.
2019-06-15 23:32:39 +03:00
Azat Khuzhin
e5b8f4c192
evdns: add DNS_OPTION_NAMESERVERS_NO_DEFAULT/EVDNS_BASE_NAMESERVERS_NO_DEFAULT
- DNS_OPTION_NAMESERVERS_NO_DEFAULT
  Do not "default" nameserver (i.e. "127.0.0.1:53") if there is no nameservers
  in resolv.conf, (iff DNS_OPTION_NAMESERVERS is set)

- EVDNS_BASE_NAMESERVERS_NO_DEFAULT
  If EVDNS_BASE_INITIALIZE_NAMESERVERS isset, do not add default
  nameserver if there are no nameservers in resolv.conf (just set
  DNS_OPTION_NAMESERVERS_NO_DEFAULT internally)

Fixes: #569
2019-04-01 02:18:59 +03:00
Azat Khuzhin
3e0dc1a6ab
evdns: add descriptions for DNS_OPTION_*/DNS_OPTIONS_ALL 2019-04-01 01:41:10 +03:00
dpayne
791e3de0c3 Generating evdns_base_config_windows_nameservers docs on all platforms 2018-04-03 15:43:22 -07:00
dpayne
2c1562949c Fixing doxygen docs for evdns_base_search_clear when generated on non-windows machines 2018-04-03 15:17:51 -07:00
Nikolay Edigaryev
808524252f Document some obvious cases where a function might also return NULL
Closes: #525
2017-07-02 13:16:59 +03:00
Nick Mathewson
537177d315 New function to get address for nameserver. 2015-02-02 13:57:22 -05:00
Nick Mathewson
0fb71c35dc Merge remote-tracking branch 'origin/patches-2.0' 2014-10-09 10:14:30 -04:00
Nick Mathewson
be1aeff21a Fix a typo in a doxygen comment. Reported by 亦得. 2014-10-09 10:14:12 -04:00
Trond Norbye
4545fa9b68 Add option to build shared library 2014-02-25 14:57:24 +01:00
Nick Mathewson
45eba6ffd5 Rename flush_outdated_host_addresses to clear_host_addresses
"flush" can imply writing something out to a file or connection before
clearing it; "clear" always means "remove".  It's also potentially
misleading to say "outdated" here, since the function removes _all_
addresses regardless, not just certain outdated ones.

Also, don't free the lock in this function.  Also reindent the function.
2013-12-06 10:50:17 -05:00
Kuldeep Gupta
f03d3535af bug fix for issues #293 evdns_base_load_hosts doesn't remove outdated addresses
As mentioned at https://sourceforge.net/p/levent/bugs/293/
created a small function "evdns_base_flush_outdated_host_addresses" which removes all the previous host addresses, if user wants to clean up the list of hosts can call and use this function.
Defination of this function is part of another patch.
2013-12-06 17:06:20 +05:30
Azat Khuzhin
6b7fa620e8 evdns: New flag to make evdns not prevent the event loop from exiting
Here is the brief description of problem:
When you are use evdns to resolve domains to IP adresses (see
./sample/dns-example) you loop never returns from event_base_dispatch(),
and because of this the program will never terminated.

Because existing programs may be depending on the old behavior, we
only apply the fix when evdns_base_new() is created with a new flag -
EVDNS_BASE_DISABLE_WHEN_INACTIVE.

 (Commit message edited by Nick while squashing the branch.)
2013-04-25 10:43:12 -04:00
Nick Mathewson
946b5841c2 Clean up lingering _identifiers. 2012-02-29 15:47:16 -05:00
Nick Mathewson
3f8c7cd035 Convert include-guard macro convention to avoid reserved identifiers
Previously we used include-guards with names like _EVENT2_EVENT_H_.
But C reserves macros beginning with an underscore for use by the
system.  This patch converts all include guards for files like
include/event2/<fname.h> to be of form EVENT2_<FNAME_H>_INCLUDED_,
and all Libevent 1.x headers in include/<fname.h> to be of the form
EVENT1_<FNAME_H>_INCLUDED_, and all internal libevent headers with
names like <fname.h> to the form <FNAME_H>_INCLUDED_.

FNAME_H is here derived from fname.h by replacing every
non-macro-usable character in fname.h with an underscore, and
putting every remaining character in uppercase.

This is an automatic conversion.  The script that produced was made by
running the following script over all header files:

=====
#!/usr/bin/perl -w

# Run this on every .h file except config.h, sys/queue.h, WIN32/event2/event-config.h

use strict;

my %macros = ();
my %skipped = ();
FILE: for my $fn (@ARGV) {
    my $f = $fn;
    if ($fn !~ /^\.\//) {
	$f = "./$fn";
    }
    if ($f eq './config.h' or
	$f =~ m#/tree.h$# or
	$f =~ m#/queue.h# or
	$f =~ m#/event-config.h# or
	$f =~ m#/evconfig-private.h#) {
	$skipped{$fn} = 1;
	next FILE;
    }
    $skipped{$fn} = 0;
    open(F, $fn);
    while (<F>) {
	if (/^#ifndef ([A-Za-z0-9_]+)/) {
	    $macros{$fn} = $1;
	    next FILE;
	}
    }
}

print "#!/usr/bin/perl -w -i -p\n\n";
for my $fn (@ARGV) {
    if (! exists $macros{$fn}) {
	print "# No macro known for $fn!\n" if (!$skipped{$fn});
    } else {
	if ($macros{$fn} !~ /_H_?$/) {
	    print "# Weird macro for $fn...\n";
	}
	my $goodmacro = uc $fn;
	$goodmacro =~ s#^\./##;
	$goodmacro =~ s#INCLUDE/EVENT2#EVENT2#;
	$goodmacro =~ s#INCLUDE/#EVENT1_#;
	$goodmacro =~ s#TEST/##;

	$goodmacro =~ s#[\/\-\.]#_#g;

	print "s/(?<![A-Za-z0-9_])$macros{$fn}(?![A-Za-z0-9_])/${goodmacro}_INCLUDED_/g;\n"
    }
}
=== And then running the script below that it generated over all
=== the .h files again
#!/usr/bin/perl -w -i -p

s/(?<![A-Za-z0-9_])_BUFFEREVENT_INTERNAL_H_(?![A-Za-z0-9_])/BUFFEREVENT_INTERNAL_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_CHANGELIST_H_(?![A-Za-z0-9_])/CHANGELIST_INTERNAL_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_DEFER_INTERNAL_H_(?![A-Za-z0-9_])/DEFER_INTERNAL_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_EVBUFFER_INTERNAL_H_(?![A-Za-z0-9_])/EVBUFFER_INTERNAL_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_EVENT_INTERNAL_H_(?![A-Za-z0-9_])/EVENT_INTERNAL_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_EVMAP_H_(?![A-Za-z0-9_])/EVMAP_INTERNAL_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_EVRPC_INTERNAL_H_(?![A-Za-z0-9_])/EVRPC_INTERNAL_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_EVSIGNAL_H_(?![A-Za-z0-9_])/EVSIGNAL_INTERNAL_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_EVTHREAD_INTERNAL_H_(?![A-Za-z0-9_])/EVTHREAD_INTERNAL_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_EVENT_HT_H(?![A-Za-z0-9_])/HT_INTERNAL_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_HTTP_INTERNAL_H_(?![A-Za-z0-9_])/HTTP_INTERNAL_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_EVDNS_H_(?![A-Za-z0-9_])/EVENT1_EVDNS_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_EVENT_H_(?![A-Za-z0-9_])/EVENT1_EVENT_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_EVENT2_BUFFER_H_(?![A-Za-z0-9_])/EVENT2_BUFFER_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_EVENT2_BUFFER_COMPAT_H_(?![A-Za-z0-9_])/EVENT2_BUFFER_COMPAT_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_EVENT2_BUFFEREVENT_H_(?![A-Za-z0-9_])/EVENT2_BUFFEREVENT_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_EVENT2_BUFFEREVENT_COMPAT_H_(?![A-Za-z0-9_])/EVENT2_BUFFEREVENT_COMPAT_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_EVENT2_BUFFEREVENT_SSL_H_(?![A-Za-z0-9_])/EVENT2_BUFFEREVENT_SSL_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_EVENT2_BUFFEREVENT_STRUCT_H_(?![A-Za-z0-9_])/EVENT2_BUFFEREVENT_STRUCT_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_EVENT2_DNS_H_(?![A-Za-z0-9_])/EVENT2_DNS_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_EVENT2_DNS_COMPAT_H_(?![A-Za-z0-9_])/EVENT2_DNS_COMPAT_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_EVENT2_DNS_STRUCT_H_(?![A-Za-z0-9_])/EVENT2_DNS_STRUCT_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_EVENT2_EVENT_H_(?![A-Za-z0-9_])/EVENT2_EVENT_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_EVENT2_EVENT_COMPAT_H_(?![A-Za-z0-9_])/EVENT2_EVENT_COMPAT_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_EVENT2_EVENT_STRUCT_H_(?![A-Za-z0-9_])/EVENT2_EVENT_STRUCT_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_EVENT2_HTTP_H_(?![A-Za-z0-9_])/EVENT2_HTTP_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_EVENT2_HTTP_COMPAT_H_(?![A-Za-z0-9_])/EVENT2_HTTP_COMPAT_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_EVENT2_HTTP_STRUCT_H_(?![A-Za-z0-9_])/EVENT2_HTTP_STRUCT_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_EVENT2_EVENT_KEYVALQ_STRUCT_H_(?![A-Za-z0-9_])/EVENT2_KEYVALQ_STRUCT_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_EVENT2_LISTENER_H_(?![A-Za-z0-9_])/EVENT2_LISTENER_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_EVENT2_RPC_H_(?![A-Za-z0-9_])/EVENT2_RPC_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_EVENT2_RPC_COMPAT_H_(?![A-Za-z0-9_])/EVENT2_RPC_COMPAT_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_EVENT2_RPC_STRUCT_H_(?![A-Za-z0-9_])/EVENT2_RPC_STRUCT_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_EVENT2_TAG_H_(?![A-Za-z0-9_])/EVENT2_TAG_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_EVENT2_TAG_COMPAT_H_(?![A-Za-z0-9_])/EVENT2_TAG_COMPAT_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_EVENT2_THREAD_H_(?![A-Za-z0-9_])/EVENT2_THREAD_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_EVENT2_UTIL_H_(?![A-Za-z0-9_])/EVENT2_UTIL_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_EVHTTP_H_(?![A-Za-z0-9_])/EVENT1_EVHTTP_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_EVRPC_H_(?![A-Za-z0-9_])/EVENT1_EVRPC_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_EVUTIL_H_(?![A-Za-z0-9_])/EVENT1_EVUTIL_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_EVENT_IOCP_INTERNAL_H(?![A-Za-z0-9_])/IOCP_INTERNAL_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_EVENT_IPV6_INTERNAL_H(?![A-Za-z0-9_])/IPV6_INTERNAL_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_LOG_H_(?![A-Za-z0-9_])/LOG_INTERNAL_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_MIN_HEAP_H_(?![A-Za-z0-9_])/MINHEAP_INTERNAL_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_EVENT_MM_INTERNAL_H(?![A-Za-z0-9_])/MM_INTERNAL_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_RATELIM_INTERNAL_H_(?![A-Za-z0-9_])/RATELIM_INTERNAL_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_STRLCPY_INTERNAL_H_(?![A-Za-z0-9_])/STRLCPY_INTERNAL_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_REGRESS_H_(?![A-Za-z0-9_])/REGRESS_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_TESTUTILS_H(?![A-Za-z0-9_])/REGRESS_TESTUTILS_H_INCLUDED_/g;
# Weird macro for test/tinytest.h...
s/(?<![A-Za-z0-9_])TINYTEST_H_INCLUDED_(?![A-Za-z0-9_])/TINYTEST_H_INCLUDED_/g;
# No macro known for test/tinytest_local.h!
# Weird macro for test/tinytest_macros.h...
s/(?<![A-Za-z0-9_])TINYTEST_MACROS_H_INCLUDED_(?![A-Za-z0-9_])/TINYTEST_MACROS_H_INCLUDED_/g;
s/(?<![A-Za-z0-9_])_EVENT_UTIL_INTERNAL_H(?![A-Za-z0-9_])/UTIL_INTERNAL_H_INCLUDED_/g;
2012-02-29 15:07:31 -05:00
Nick Mathewson
539466e568 Merge remote-tracking branch 'origin/patches-2.0'
Conflicts:
	Makefile.am
	WIN32-Code/event2/event-config.h
	configure.in
2012-02-10 17:33:50 -05:00
Nick Mathewson
e49e289129 Update copyright notices to 2012 2012-02-10 17:29:53 -05:00
Nick Mathewson
0cb70e3333 Merge remote-tracking branch 'origin/patches-2.0' 2011-10-26 10:17:21 -04:00
Nick Mathewson
3c824bd334 Update copyright dates to 2011. 2011-10-24 13:18:09 -04:00
Nick Mathewson
fed8f6e484 Merge remote-tracking branch 'origin/patches-2.0' 2011-10-10 11:34:26 -04:00
Greg Hazel
ba5c27d47f refer to non-deprecated evdns functions in comments 2011-10-10 11:33:15 -04:00
Nick Mathewson
38674d4a5e Merge remote-tracking branch 'origin/patches-2.0' 2011-09-12 15:46:54 -04:00
Leonid Evdokimov
94fba5b9ac Add DNS_ERR_NODATA error code to handle empty replies. 2011-09-12 15:38:05 -04:00
Leonid Evdokimov
2b6eae5999 Fix docstring in dns.h 2011-09-12 15:09:30 -04:00
Nick Mathewson
d7451b0523 Merge remote-tracking branch 'origin/patches-2.0' 2011-08-15 11:14:57 -04:00
Leonid Evdokimov
50be5a14b5 Another docstring fix. 2011-08-15 11:11:10 -04:00
Nick Mathewson
21be3dff74 Merge remote-tracking branch 'origin/patches-2.0'
Conflicts:
	include/event2/buffer.h
	include/event2/thread.h
	include/event2/util.h
2011-07-05 14:38:21 -04:00
Nick Mathewson
2888faccd1 Revise the event/evbuffer/bufferevent doxygen for clarity and accuracy 2011-07-05 13:01:07 -04:00
Nick Mathewson
9f560bfa11 Use "_WIN32", not WIN32: it's standard and we don't need to fake it
This patch was automatically generated with perl.

Based on a patch by Peter Rosin.
2011-05-25 20:03:15 -04:00
Nick Mathewson
494186129f Use the US-English "canceled", not the UK "cancelled". 2010-11-19 12:08:29 -05:00
Nick Mathewson
195214360c Expose a function to add a nameserver by sockaddr 2010-09-03 16:42:16 -04:00
Nick Mathewson
33200e72de Document that DNS_NO_SEARCH is an obsolete alias for DNS_QUERY_NO_SEARCH 2010-08-10 15:03:14 -04:00
Nick Mathewson
cc2379d264 Constify a couple of arguments to evdns_server_request_add_*_reply 2010-07-26 14:48:32 -04:00
Nick Mathewson
e1c1167cbe Replace (unused,always 0) is_tcp argument to evdns_add_server_port*() with flags
Since we weren't using it for anything, and we always failed if it was
set, we're allowed to change the future semantics of setting it.
2010-07-22 14:44:24 +02:00
Nick Mathewson
b2f2be6edc Make evdns use the regular logging system by default
Once, for reasons that made sense at the time, we had evdns.c use its
own logging subsystem with two levels, "warn" and "debug".  This leads
to problems, since setting a log handler for Libevent wouldn't actually
trap these messages, since they weren't on by default, and since some of
the warns should really be msgs.

This patch changes the default behavior of evdns.c to log to
event_(debugx,warnx,msgx) by default, and adds a new (internal-use-only)
log level of EVDNS_LOG_MSG.  Programs that set a evdns logging
function will see no change.  Programs that don't will now see evdns
warnings reported like other warnings.
2010-03-10 16:25:16 -05:00
Nick Mathewson
17efc1cdfa Update all our copyright notices to say "2010" 2010-03-04 01:38:48 -05:00
Nick Mathewson
e5bbd40ad7 Clean up formatting: use tabs, not 8-spaces, to indent. 2010-02-18 17:44:09 -05:00
Nick Mathewson
8fdf09c09d Clean up formatting: Disallow space-before-tab. 2010-02-18 17:08:50 -05:00
Nick Mathewson
d4de062efc Add an arc4random implementation for use by evdns
Previously, evdns was at the mercy of the user for providing a good
entropy source; without one, it would be vulnerable to various
active attacks.

This patch adds a port of OpenBSD's arc4random() calls to Libevent
[port by Chris Davis], and wraps it up a little bit so we can use it
more safely.
2010-02-11 12:53:32 -05:00
Nick Mathewson
1dd7e6dc3a Remove the 'flags' argument from evdns_base_set_option()
The 'flags' argument made sense when passed to
evdns_(base_)?parse_resolv_conf when it said which parts of the
resolv.conf file to obey.  But for evdns_set_option(), it was really
silly, since you wouldn't be calling evdns_set_option() unless you
actually wanted to set the option.  Its meaning was basically, "set
this to DNS_OPTIONS_ALL unless you want a funny surprise."

evdns_base_set_option was new in 2.0.1-alpha, so we aren't committed
to keeping it source-compatible.
2010-02-05 13:55:12 -05:00