154 строки
3.7 KiB
C
154 строки
3.7 KiB
C
/* $Id$ */
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/* Copyright 1998 by the Massachusetts Institute of Technology.
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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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#include <stdio.h>
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#include <sys/types.h>
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#ifdef WIN32
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#else
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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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#define DEFAULT_TIMEOUT 5
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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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#ifdef WIN32
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#define IsNT ((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 PATH_HOSTS_NT "\\drivers\\etc\\hosts"
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#define PATH_HOSTS_9X "\\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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struct send_request {
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/* Remaining data to send */
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const unsigned char *data;
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int len;
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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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int udp_socket;
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int 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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};
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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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time_t timeout;
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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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int *skip_server;
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int using_tcp;
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int error_status;
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/* Next query in chain */
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struct query *next;
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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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struct apattern {
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struct in_addr addr;
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struct in_addr mask;
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};
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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;
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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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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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/* Active queries */
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struct query *queries;
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};
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void ares__send_query(ares_channel channel, struct query *query, time_t now);
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void ares__close_sockets(struct server_state *server);
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int ares__get_hostent(FILE *fp, struct hostent **host);
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int ares__read_line(FILE *fp, char **buf, int *bufsize);
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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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