mirror of
https://github.com/moparisthebest/curl
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325 lines
9.0 KiB
C
325 lines
9.0 KiB
C
#ifndef __ARES_PRIVATE_H
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#define __ARES_PRIVATE_H
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/* $Id$ */
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/* Copyright 1998 by the Massachusetts Institute of Technology.
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* Copyright (C) 2004-2008 by Daniel Stenberg
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*
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* Permission to use, copy, modify, and distribute this
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* software and its documentation for any purpose and without
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* fee is hereby granted, provided that the above copyright
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* notice appear in all copies and that both that copyright
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* notice and this permission notice appear in supporting
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* documentation, and that the name of M.I.T. not be used in
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* advertising or publicity pertaining to distribution of the
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* software without specific, written prior permission.
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* M.I.T. makes no representations about the suitability of
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* this software for any purpose. It is provided "as is"
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* without express or implied warranty.
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*/
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/*
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* Define WIN32 when build target is Win32 API
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*/
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#if (defined(_WIN32) || defined(__WIN32__)) && !defined(WIN32)
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#define WIN32
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#endif
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#include <stdio.h>
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#include <sys/types.h>
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#if !defined(WIN32) || defined(WATT32)
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#include <netinet/in.h>
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/* We define closesocket() here so that we can use this function all over
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the source code for closing sockets. */
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#define closesocket(x) close(x)
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#endif
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#ifdef WATT32
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#include <tcp.h>
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#include <sys/ioctl.h>
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#undef closesocket
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#define closesocket(s) close_s(s)
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#define writev(s,v,c) writev_s(s,v,c)
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#define HAVE_WRITEV 1
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#endif
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#ifdef NETWARE
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#include <time.h>
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#endif
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#define DEFAULT_TIMEOUT 5000 /* milliseconds */
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#define DEFAULT_TRIES 4
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#ifndef INADDR_NONE
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#define INADDR_NONE 0xffffffff
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#endif
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#if defined(WIN32) && !defined(WATT32)
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#define IS_NT() ((int)GetVersion() > 0)
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#define WIN_NS_9X "System\\CurrentControlSet\\Services\\VxD\\MSTCP"
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#define WIN_NS_NT_KEY "System\\CurrentControlSet\\Services\\Tcpip\\Parameters"
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#define NAMESERVER "NameServer"
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#define DHCPNAMESERVER "DhcpNameServer"
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#define DATABASEPATH "DatabasePath"
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#define WIN_PATH_HOSTS "\\hosts"
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#elif defined(WATT32)
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#define PATH_RESOLV_CONF "/dev/ENV/etc/resolv.conf"
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#elif defined(NETWARE)
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#define PATH_RESOLV_CONF "sys:/etc/resolv.cfg"
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#define PATH_HOSTS "sys:/etc/hosts"
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#elif defined(__riscos__)
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#define PATH_HOSTS "InetDBase:Hosts"
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#else
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#define PATH_RESOLV_CONF "/etc/resolv.conf"
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#ifdef ETC_INET
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#define PATH_HOSTS "/etc/inet/hosts"
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#else
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#define PATH_HOSTS "/etc/hosts"
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#endif
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#endif
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#define ARES_ID_KEY_LEN 31
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#include "ares_ipv6.h"
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#include "ares_llist.h"
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#ifndef HAVE_STRDUP
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# include "ares_strdup.h"
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# define strdup(ptr) ares_strdup(ptr)
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#endif
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#ifndef HAVE_STRCASECMP
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# include "ares_strcasecmp.h"
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# define strcasecmp(p1,p2) ares_strcasecmp(p1,p2)
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#endif
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#ifndef HAVE_STRNCASECMP
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# include "ares_strcasecmp.h"
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# define strncasecmp(p1,p2,n) ares_strncasecmp(p1,p2,n)
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#endif
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#ifndef HAVE_WRITEV
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# include "ares_writev.h"
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# define writev(s,ptr,cnt) ares_writev(s,ptr,cnt)
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#endif
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struct query;
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struct send_request {
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/* Remaining data to send */
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const unsigned char *data;
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size_t len;
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/* The query for which we're sending this data */
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struct query* owner_query;
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/* The buffer we're using, if we have our own copy of the packet */
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unsigned char *data_storage;
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/* Next request in queue */
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struct send_request *next;
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};
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struct server_state {
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struct in_addr addr;
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ares_socket_t udp_socket;
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ares_socket_t tcp_socket;
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/* Mini-buffer for reading the length word */
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unsigned char tcp_lenbuf[2];
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int tcp_lenbuf_pos;
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int tcp_length;
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/* Buffer for reading actual TCP data */
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unsigned char *tcp_buffer;
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int tcp_buffer_pos;
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/* TCP output queue */
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struct send_request *qhead;
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struct send_request *qtail;
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/* Which incarnation of this connection is this? We don't want to
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* retransmit requests into the very same socket, but if the server
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* closes on us and we re-open the connection, then we do want to
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* re-send. */
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int tcp_connection_generation;
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/* Circular, doubly-linked list of outstanding queries to this server */
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struct list_node queries_to_server;
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/* Link back to owning channel */
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ares_channel channel;
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/* Is this server broken? We mark connections as broken when a
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* request that is queued for sending times out.
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*/
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int is_broken;
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};
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/* State to represent a DNS query */
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struct query {
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/* Query ID from qbuf, for faster lookup, and current timeout */
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unsigned short qid;
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struct timeval timeout;
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/*
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* Links for the doubly-linked lists in which we insert a query.
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* These circular, doubly-linked lists that are hash-bucketed based
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* the attributes we care about, help making most important
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* operations O(1).
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*/
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struct list_node queries_by_qid; /* hopefully in same cache line as qid */
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struct list_node queries_by_timeout;
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struct list_node queries_to_server;
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struct list_node all_queries;
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/* Query buf with length at beginning, for TCP transmission */
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unsigned char *tcpbuf;
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int tcplen;
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/* Arguments passed to ares_send() (qbuf points into tcpbuf) */
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const unsigned char *qbuf;
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int qlen;
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ares_callback callback;
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void *arg;
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/* Query status */
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int try;
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int server;
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struct query_server_info *server_info; /* per-server state */
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int using_tcp;
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int error_status;
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int timeouts; /* number of timeouts we saw for this request */
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};
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/* Per-server state for a query */
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struct query_server_info {
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int skip_server; /* should we skip server, due to errors, etc? */
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int tcp_connection_generation; /* into which TCP connection did we send? */
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};
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/* An IP address pattern; matches an IP address X if X & mask == addr */
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#define PATTERN_MASK 0x1
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#define PATTERN_CIDR 0x2
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union ares_addr {
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struct in_addr addr4;
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struct in6_addr addr6;
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};
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struct apattern {
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union ares_addr addr;
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union
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{
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union ares_addr addr;
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unsigned short bits;
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} mask;
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int family;
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unsigned short type;
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};
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typedef struct rc4_key
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{
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unsigned char state[256];
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unsigned char x;
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unsigned char y;
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} rc4_key;
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struct ares_channeldata {
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/* Configuration data */
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int flags;
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int timeout; /* in milliseconds */
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int tries;
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int ndots;
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int udp_port;
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int tcp_port;
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int socket_send_buffer_size;
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int socket_receive_buffer_size;
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char **domains;
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int ndomains;
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struct apattern *sortlist;
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int nsort;
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char *lookups;
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/* Server addresses and communications state */
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struct server_state *servers;
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int nservers;
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/* ID to use for next query */
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unsigned short next_id;
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/* key to use when generating new ids */
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rc4_key id_key;
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/* Generation number to use for the next TCP socket open/close */
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int tcp_connection_generation;
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/* The time at which we last called process_timeouts(). Uses integer seconds
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just to draw the line somewhere. */
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time_t last_timeout_processed;
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/* Circular, doubly-linked list of queries, bucketed various ways.... */
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/* All active queries in a single list: */
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struct list_node all_queries;
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/* Queries bucketed by qid, for quickly dispatching DNS responses: */
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#define ARES_QID_TABLE_SIZE 2048
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struct list_node queries_by_qid[ARES_QID_TABLE_SIZE];
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/* Queries bucketed by timeout, for quickly handling timeouts: */
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#define ARES_TIMEOUT_TABLE_SIZE 1024
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struct list_node queries_by_timeout[ARES_TIMEOUT_TABLE_SIZE];
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ares_sock_state_cb sock_state_cb;
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void *sock_state_cb_data;
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};
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/* return true if now is exactly check time or later */
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int ares__timedout(struct timeval *now,
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struct timeval *check);
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/* add the specific number of milliseconds to the time in the first argument */
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int ares__timeadd(struct timeval *now,
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int millisecs);
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/* return time offset between now and (future) check, in milliseconds */
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long ares__timeoffset(struct timeval *now,
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struct timeval *check);
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void ares__rc4(rc4_key* key,unsigned char *buffer_ptr, int buffer_len);
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void ares__send_query(ares_channel channel, struct query *query,
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struct timeval *now);
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void ares__close_sockets(ares_channel channel, struct server_state *server);
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int ares__get_hostent(FILE *fp, int family, struct hostent **host);
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int ares__read_line(FILE *fp, char **buf, int *bufsize);
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void ares__free_query(struct query *query);
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short ares__generate_new_id(rc4_key* key);
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struct timeval ares__tvnow(void);
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#if 0 /* Not used */
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long ares__tvdiff(struct timeval t1, struct timeval t2);
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#endif
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#define ARES_SWAP_BYTE(a,b) \
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{ unsigned char swapByte = *(a); *(a) = *(b); *(b) = swapByte; }
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#define SOCK_STATE_CALLBACK(c, s, r, w) \
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do { \
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if ((c)->sock_state_cb) \
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(c)->sock_state_cb((c)->sock_state_cb_data, (s), (r), (w)); \
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} while (0)
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#ifdef CURLDEBUG
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/* This is low-level hard-hacking memory leak tracking and similar. Using the
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libcurl lowlevel code from within library is ugly and only works when
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c-ares is built and linked with a similarly debug-build libcurl, but we do
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this anyway for convenience. */
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#include "../lib/memdebug.h"
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#endif
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#endif /* __ARES_PRIVATE_H */
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