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author | tfarina <tfarina@chromium.org> | 2015-12-19 05:55:25 -0800 |
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committer | Commit bot <commit-bot@chromium.org> | 2015-12-19 13:56:35 +0000 |
commit | c7ebe6daa79da2e351345065020cc7f216126f15 (patch) | |
tree | 72328c6cf577c4a2a99661b1e79804aa77c3147c /third_party/libevent/evdns.h | |
parent | 1a863cbef705d455a016734b57c638d16be8c578 (diff) | |
download | chromium_src-c7ebe6daa79da2e351345065020cc7f216126f15.zip chromium_src-c7ebe6daa79da2e351345065020cc7f216126f15.tar.gz chromium_src-c7ebe6daa79da2e351345065020cc7f216126f15.tar.bz2 |
move libevent into base
This simplifies the process of bootstrapping gn standalone.
And libevent is not really used outside of base. base is actually its only client.
BUG=569352
TEST=See CL for details for how to reproduce this.
R=thestig@chromium.org
TBR=cpu@chromium.org
Review URL: https://codereview.chromium.org/1531573008
Cr-Commit-Position: refs/heads/master@{#366282}
Diffstat (limited to 'third_party/libevent/evdns.h')
-rw-r--r-- | third_party/libevent/evdns.h | 528 |
1 files changed, 0 insertions, 528 deletions
diff --git a/third_party/libevent/evdns.h b/third_party/libevent/evdns.h deleted file mode 100644 index fca4ac3..0000000 --- a/third_party/libevent/evdns.h +++ /dev/null @@ -1,528 +0,0 @@ -/* - * Copyright (c) 2006 Niels Provos <provos@citi.umich.edu> - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. The name of the author may not be used to endorse or promote products - * derived from this software without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR - * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES - * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. - * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, - * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT - * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF - * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - */ - -/* - * The original DNS code is due to Adam Langley with heavy - * modifications by Nick Mathewson. Adam put his DNS software in the - * public domain. You can find his original copyright below. Please, - * aware that the code as part of libevent is governed by the 3-clause - * BSD license above. - * - * This software is Public Domain. To view a copy of the public domain dedication, - * visit http://creativecommons.org/licenses/publicdomain/ or send a letter to - * Creative Commons, 559 Nathan Abbott Way, Stanford, California 94305, USA. - * - * I ask and expect, but do not require, that all derivative works contain an - * attribution similar to: - * Parts developed by Adam Langley <agl@imperialviolet.org> - * - * You may wish to replace the word "Parts" with something else depending on - * the amount of original code. - * - * (Derivative works does not include programs which link against, run or include - * the source verbatim in their source distributions) - */ - -/** @file evdns.h - * - * Welcome, gentle reader - * - * Async DNS lookups are really a whole lot harder than they should be, - * mostly stemming from the fact that the libc resolver has never been - * very good at them. Before you use this library you should see if libc - * can do the job for you with the modern async call getaddrinfo_a - * (see http://www.imperialviolet.org/page25.html#e498). Otherwise, - * please continue. - * - * This code is based on libevent and you must call event_init before - * any of the APIs in this file. You must also seed the OpenSSL random - * source if you are using OpenSSL for ids (see below). - * - * This library is designed to be included and shipped with your source - * code. You statically link with it. You should also test for the - * existence of strtok_r and define HAVE_STRTOK_R if you have it. - * - * The DNS protocol requires a good source of id numbers and these - * numbers should be unpredictable for spoofing reasons. There are - * three methods for generating them here and you must define exactly - * one of them. In increasing order of preference: - * - * DNS_USE_GETTIMEOFDAY_FOR_ID: - * Using the bottom 16 bits of the usec result from gettimeofday. This - * is a pretty poor solution but should work anywhere. - * DNS_USE_CPU_CLOCK_FOR_ID: - * Using the bottom 16 bits of the nsec result from the CPU's time - * counter. This is better, but may not work everywhere. Requires - * POSIX realtime support and you'll need to link against -lrt on - * glibc systems at least. - * DNS_USE_OPENSSL_FOR_ID: - * Uses the OpenSSL RAND_bytes call to generate the data. You must - * have seeded the pool before making any calls to this library. - * - * The library keeps track of the state of nameservers and will avoid - * them when they go down. Otherwise it will round robin between them. - * - * Quick start guide: - * #include "evdns.h" - * void callback(int result, char type, int count, int ttl, - * void *addresses, void *arg); - * evdns_resolv_conf_parse(DNS_OPTIONS_ALL, "/etc/resolv.conf"); - * evdns_resolve("www.hostname.com", 0, callback, NULL); - * - * When the lookup is complete the callback function is called. The - * first argument will be one of the DNS_ERR_* defines in evdns.h. - * Hopefully it will be DNS_ERR_NONE, in which case type will be - * DNS_IPv4_A, count will be the number of IP addresses, ttl is the time - * which the data can be cached for (in seconds), addresses will point - * to an array of uint32_t's and arg will be whatever you passed to - * evdns_resolve. - * - * Searching: - * - * In order for this library to be a good replacement for glibc's resolver it - * supports searching. This involves setting a list of default domains, in - * which names will be queried for. The number of dots in the query name - * determines the order in which this list is used. - * - * Searching appears to be a single lookup from the point of view of the API, - * although many DNS queries may be generated from a single call to - * evdns_resolve. Searching can also drastically slow down the resolution - * of names. - * - * To disable searching: - * 1. Never set it up. If you never call evdns_resolv_conf_parse or - * evdns_search_add then no searching will occur. - * - * 2. If you do call evdns_resolv_conf_parse then don't pass - * DNS_OPTION_SEARCH (or DNS_OPTIONS_ALL, which implies it). - * - * 3. When calling evdns_resolve, pass the DNS_QUERY_NO_SEARCH flag. - * - * The order of searches depends on the number of dots in the name. If the - * number is greater than the ndots setting then the names is first tried - * globally. Otherwise each search domain is appended in turn. - * - * The ndots setting can either be set from a resolv.conf, or by calling - * evdns_search_ndots_set. - * - * For example, with ndots set to 1 (the default) and a search domain list of - * ["myhome.net"]: - * Query: www - * Order: www.myhome.net, www. - * - * Query: www.abc - * Order: www.abc., www.abc.myhome.net - * - * Internals: - * - * Requests are kept in two queues. The first is the inflight queue. In - * this queue requests have an allocated transaction id and nameserver. - * They will soon be transmitted if they haven't already been. - * - * The second is the waiting queue. The size of the inflight ring is - * limited and all other requests wait in waiting queue for space. This - * bounds the number of concurrent requests so that we don't flood the - * nameserver. Several algorithms require a full walk of the inflight - * queue and so bounding its size keeps thing going nicely under huge - * (many thousands of requests) loads. - * - * If a nameserver loses too many requests it is considered down and we - * try not to use it. After a while we send a probe to that nameserver - * (a lookup for google.com) and, if it replies, we consider it working - * again. If the nameserver fails a probe we wait longer to try again - * with the next probe. - */ - -#ifndef EVENTDNS_H -#define EVENTDNS_H - -#ifdef __cplusplus -extern "C" { -#endif - -/* For integer types. */ -#include "evutil.h" - -/** Error codes 0-5 are as described in RFC 1035. */ -#define DNS_ERR_NONE 0 -/** The name server was unable to interpret the query */ -#define DNS_ERR_FORMAT 1 -/** The name server was unable to process this query due to a problem with the - * name server */ -#define DNS_ERR_SERVERFAILED 2 -/** The domain name does not exist */ -#define DNS_ERR_NOTEXIST 3 -/** The name server does not support the requested kind of query */ -#define DNS_ERR_NOTIMPL 4 -/** The name server refuses to reform the specified operation for policy - * reasons */ -#define DNS_ERR_REFUSED 5 -/** The reply was truncated or ill-formated */ -#define DNS_ERR_TRUNCATED 65 -/** An unknown error occurred */ -#define DNS_ERR_UNKNOWN 66 -/** Communication with the server timed out */ -#define DNS_ERR_TIMEOUT 67 -/** The request was canceled because the DNS subsystem was shut down. */ -#define DNS_ERR_SHUTDOWN 68 - -#define DNS_IPv4_A 1 -#define DNS_PTR 2 -#define DNS_IPv6_AAAA 3 - -#define DNS_QUERY_NO_SEARCH 1 - -#define DNS_OPTION_SEARCH 1 -#define DNS_OPTION_NAMESERVERS 2 -#define DNS_OPTION_MISC 4 -#define DNS_OPTIONS_ALL 7 - -/** - * The callback that contains the results from a lookup. - * - type is either DNS_IPv4_A or DNS_PTR or DNS_IPv6_AAAA - * - count contains the number of addresses of form type - * - ttl is the number of seconds the resolution may be cached for. - * - addresses needs to be cast according to type - */ -typedef void (*evdns_callback_type) (int result, char type, int count, int ttl, void *addresses, void *arg); - -/** - Initialize the asynchronous DNS library. - - This function initializes support for non-blocking name resolution by - calling evdns_resolv_conf_parse() on UNIX and - evdns_config_windows_nameservers() on Windows. - - @return 0 if successful, or -1 if an error occurred - @see evdns_shutdown() - */ -int evdns_init(void); - - -/** - 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. - - @param fail_requests if zero, active requests will be aborted; if non-zero, - active requests will return DNS_ERR_SHUTDOWN. - @see evdns_init() - */ -void evdns_shutdown(int fail_requests); - - -/** - Convert a DNS error code to a string. - - @param err the DNS error code - @return a string containing an explanation of the error code -*/ -const char *evdns_err_to_string(int err); - - -/** - 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. - - @param address an IP address in network byte order - @return 0 if successful, or -1 if an error occurred - @see evdns_nameserver_ip_add() - */ -int evdns_nameserver_add(unsigned long int address); - - -/** - 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. - - @return the number of configured nameservers - @see evdns_nameserver_add() - */ -int evdns_count_nameservers(void); - - -/** - Remove all configured nameservers, and suspend all pending resolves. - - Resolves will not necessarily be re-attempted until evdns_resume() is called. - - @return 0 if successful, or -1 if an error occurred - @see evdns_resume() - */ -int evdns_clear_nameservers_and_suspend(void); - - -/** - Resume normal operation and continue any suspended resolve requests. - - Re-attempt resolves left in limbo after an earlier call to - evdns_clear_nameservers_and_suspend(). - - @return 0 if successful, or -1 if an error occurred - @see evdns_clear_nameservers_and_suspend() - */ -int evdns_resume(void); - - -/** - Add a nameserver. - - This wraps the evdns_nameserver_add() function by parsing a string as an IP - address and adds it as a nameserver. - - @return 0 if successful, or -1 if an error occurred - @see evdns_nameserver_add() - */ -int evdns_nameserver_ip_add(const char *ip_as_string); - - -/** - Lookup an A record for a given name. - - @param name a DNS hostname - @param flags either 0, or DNS_QUERY_NO_SEARCH to disable searching for this query. - @param callback a callback function to invoke when the request is completed - @param ptr an argument to pass to the callback function - @return 0 if successful, or -1 if an error occurred - @see evdns_resolve_ipv6(), evdns_resolve_reverse(), evdns_resolve_reverse_ipv6() - */ -int evdns_resolve_ipv4(const char *name, int flags, evdns_callback_type callback, void *ptr); - - -/** - Lookup an AAAA record for a given name. - - @param name a DNS hostname - @param flags either 0, or DNS_QUERY_NO_SEARCH to disable searching for this query. - @param callback a callback function to invoke when the request is completed - @param ptr an argument to pass to the callback function - @return 0 if successful, or -1 if an error occurred - @see evdns_resolve_ipv4(), evdns_resolve_reverse(), evdns_resolve_reverse_ipv6() - */ -int evdns_resolve_ipv6(const char *name, int flags, evdns_callback_type callback, void *ptr); - -struct in_addr; -struct in6_addr; - -/** - Lookup a PTR record for a given IP address. - - @param in an IPv4 address - @param flags either 0, or DNS_QUERY_NO_SEARCH to disable searching for this query. - @param callback a callback function to invoke when the request is completed - @param ptr an argument to pass to the callback function - @return 0 if successful, or -1 if an error occurred - @see evdns_resolve_reverse_ipv6() - */ -int evdns_resolve_reverse(const struct in_addr *in, int flags, evdns_callback_type callback, void *ptr); - - -/** - Lookup a PTR record for a given IPv6 address. - - @param in an IPv6 address - @param flags either 0, or DNS_QUERY_NO_SEARCH to disable searching for this query. - @param callback a callback function to invoke when the request is completed - @param ptr an argument to pass to the callback function - @return 0 if successful, or -1 if an error occurred - @see evdns_resolve_reverse_ipv6() - */ -int evdns_resolve_reverse_ipv6(const struct in6_addr *in, int flags, evdns_callback_type callback, void *ptr); - - -/** - Set the value of a configuration option. - - The currently available configuration options are: - - ndots, timeout, max-timeouts, max-inflight, and attempts - - @param option the name of the configuration option to be modified - @param val the value to be set - @param flags either 0 | DNS_OPTION_SEARCH | DNS_OPTION_MISC - @return 0 if successful, or -1 if an error occurred - */ -int evdns_set_option(const char *option, const char *val, int flags); - - -/** - 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. - - The following directives are not parsed from the file: sortlist, rotate, - no-check-names, inet6, debug. - - 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 - - @param flags any of DNS_OPTION_NAMESERVERS|DNS_OPTION_SEARCH|DNS_OPTION_MISC| - DNS_OPTIONS_ALL - @param filename the path to the resolv.conf file - @return 0 if successful, or various positive error codes if an error - occurred (see above) - @see resolv.conf(3), evdns_config_windows_nameservers() - */ -int evdns_resolv_conf_parse(int flags, const char *const filename); - - -/** - Obtain nameserver information using the Windows API. - - Attempt to configure a set of nameservers based on platform settings on - a win32 host. Preferentially tries to use GetNetworkParams; if that fails, - looks in the registry. - - @return 0 if successful, or -1 if an error occurred - @see evdns_resolv_conf_parse() - */ -#ifdef WIN32 -int evdns_config_windows_nameservers(void); -#endif - - -/** - Clear the list of search domains. - */ -void evdns_search_clear(void); - - -/** - Add a domain to the list of search domains - - @param domain the domain to be added to the search list - */ -void evdns_search_add(const char *domain); - - -/** - 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. - - @param ndots the new ndots parameter - */ -void evdns_search_ndots_set(const int ndots); - -/** - A callback that is invoked when a log message is generated - - @param is_warning indicates if the log message is a 'warning' - @param msg the content of the log message - */ -typedef void (*evdns_debug_log_fn_type)(int is_warning, const char *msg); - - -/** - Set the callback function to handle log messages. - - @param fn the callback to be invoked when a log message is generated - */ -void evdns_set_log_fn(evdns_debug_log_fn_type fn); - -/** - Set a callback that will be invoked to generate transaction IDs. By - default, we pick transaction IDs based on the current clock time. - - @param fn the new callback, or NULL to use the default. - */ -void evdns_set_transaction_id_fn(ev_uint16_t (*fn)(void)); - -#define DNS_NO_SEARCH 1 - -/* - * Structures and functions used to implement a DNS server. - */ - -struct evdns_server_request { - int flags; - int nquestions; - struct evdns_server_question **questions; -}; -struct evdns_server_question { - int type; -#ifdef __cplusplus - int dns_question_class; -#else - /* You should refer to this field as "dns_question_class". The - * name "class" works in C for backward compatibility, and will be - * removed in a future version. (1.5 or later). */ - int class; -#define dns_question_class class -#endif - char name[1]; -}; -typedef void (*evdns_request_callback_fn_type)(struct evdns_server_request *, void *); -#define EVDNS_ANSWER_SECTION 0 -#define EVDNS_AUTHORITY_SECTION 1 -#define EVDNS_ADDITIONAL_SECTION 2 - -#define EVDNS_TYPE_A 1 -#define EVDNS_TYPE_NS 2 -#define EVDNS_TYPE_CNAME 5 -#define EVDNS_TYPE_SOA 6 -#define EVDNS_TYPE_PTR 12 -#define EVDNS_TYPE_MX 15 -#define EVDNS_TYPE_TXT 16 -#define EVDNS_TYPE_AAAA 28 - -#define EVDNS_QTYPE_AXFR 252 -#define EVDNS_QTYPE_ALL 255 - -#define EVDNS_CLASS_INET 1 - -struct evdns_server_port *evdns_add_server_port(int socket, int is_tcp, evdns_request_callback_fn_type callback, void *user_data); -void evdns_close_server_port(struct evdns_server_port *port); - -int evdns_server_request_add_reply(struct evdns_server_request *req, int section, const char *name, int type, int dns_class, int ttl, int datalen, int is_name, const char *data); -int evdns_server_request_add_a_reply(struct evdns_server_request *req, const char *name, int n, void *addrs, int ttl); -int evdns_server_request_add_aaaa_reply(struct evdns_server_request *req, const char *name, int n, void *addrs, int ttl); -int evdns_server_request_add_ptr_reply(struct evdns_server_request *req, struct in_addr *in, const char *inaddr_name, const char *hostname, int ttl); -int evdns_server_request_add_cname_reply(struct evdns_server_request *req, const char *name, const char *cname, int ttl); - -int evdns_server_request_respond(struct evdns_server_request *req, int err); -int evdns_server_request_drop(struct evdns_server_request *req); -struct sockaddr; -int evdns_server_request_get_requesting_addr(struct evdns_server_request *_req, struct sockaddr *sa, int addr_len); - -#ifdef __cplusplus -} -#endif - -#endif /* !EVENTDNS_H */ |