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diff --git a/src/or/eventdns.h b/src/or/eventdns.h
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+++ b/src/or/eventdns.h
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+/* 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)
+ */
+
+#ifndef EVENTDNS_H
+#define EVENTDNS_H
+
+#define DNS_ERR_NONE 0
+#define DNS_ERR_FORMAT 1
+#define DNS_ERR_SERVERFAILED 2
+#define DNS_ERR_NOTEXIST 3
+#define DNS_ERR_NOTIMPL 4
+#define DNS_ERR_REFUSED 5
+#define DNS_ERR_TRUNCATED 65
+#define DNS_ERR_UNKNOWN 66
+#define DNS_ERR_TIMEOUT 67
+
+#define DNS_IPv4_A 1
+
+#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
+
+typedef void (*eventdns_callback_type) (int result, char type, int count, int ttl, void *addresses, void *arg);
+
+int eventdns_nameserver_add(unsigned long int address);
+int eventdns_nameserver_ip_add(const char *ip_as_string);
+int eventdns_resolve(const char *name, int flags, eventdns_callback_type callback, void *ptr);
+int eventdns_resolv_conf_parse(int flags, const char *);
+void eventdns_search_clear();
+void eventdns_search_add(const char *domain);
+void eventdns_search_ndots_set();
+
+#define DNS_NO_SEARCH 1
+
+#endif  // !EVENTDNS_H