723 lines
20 KiB
C
723 lines
20 KiB
C
/*
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* event.c
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* - event loop core
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* - TCP connection management
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* - user-visible check/wait and event-loop-related functions
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*/
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/*
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* This file is
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* Copyright (C) 1997-2000 Ian Jackson <ian@davenant.greenend.org.uk>
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*
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* It is part of adns, which is
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* Copyright (C) 1997-2000 Ian Jackson <ian@davenant.greenend.org.uk>
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* Copyright (C) 1999-2000 Tony Finch <dot@dotat.at>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* $Id: event.c,v 1.2 2002/08/13 14:44:59 fishwaldo Exp $
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*/
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#include "stdinc.h"
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#include "fileio.h"
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#include "s_bsd.h"
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#include "internal.h"
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#include "memory.h"
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#include "tvarith.h"
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#include "irc_string.h"
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#include "memory.h"
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#include "adns.h"
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/* TCP connection management. */
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static void tcp_close(adns_state ads) {
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int serv;
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serv= ads->tcpserver;
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fd_close(ads->tcpsocket);
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ads->tcpsocket= -1;
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ads->tcprecv.used= ads->tcprecv_skip= ads->tcpsend.used= 0;
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}
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void adns__tcp_broken(adns_state ads, const char *what, const char *why) {
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int serv;
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adns_query qu;
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assert(ads->tcpstate == server_connecting || ads->tcpstate == server_ok);
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serv= ads->tcpserver;
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if (what) adns__warn(ads,serv,0,"TCP connection failed: %s: %s",what,why);
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if (ads->tcpstate == server_connecting) {
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/* Counts as a retry for all the queries waiting for TCP. */
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for (qu= ads->tcpw.head; qu; qu= qu->next)
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qu->retries++;
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}
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tcp_close(ads);
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ads->tcpstate= server_broken;
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ads->tcpserver= (serv+1)%ads->nservers;
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}
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static void tcp_connected(adns_state ads, struct timeval now) {
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adns_query qu, nqu;
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adns__debug(ads,ads->tcpserver,0,"TCP connected");
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ads->tcpstate= server_ok;
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for (qu= ads->tcpw.head; qu && ads->tcpstate == server_ok; qu= nqu) {
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nqu= qu->next;
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assert(qu->state == query_tcpw);
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adns__querysend_tcp(qu,now);
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}
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}
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void adns__tcp_tryconnect(adns_state ads, struct timeval now) {
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int r, fd, tries;
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struct sockaddr_in addr;
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for (tries=0; tries<ads->nservers; tries++) {
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switch (ads->tcpstate) {
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case server_connecting:
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case server_ok:
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case server_broken:
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return;
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case server_disconnected:
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break;
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default:
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abort();
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}
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assert(!ads->tcpsend.used);
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assert(!ads->tcprecv.used);
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assert(!ads->tcprecv_skip);
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fd= comm_open(AF_INET, SOCK_STREAM, 0, "adns TCP socket");
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if (fd<0) {
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adns__diag(ads,-1,0,"cannot create TCP socket: %s",strerror(errno));
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return;
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}
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r= adns__setnonblock(ads,fd);
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if (r) {
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adns__diag(ads,-1,0,"cannot make TCP socket nonblocking: %s",strerror(r));
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fd_close(fd);
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return;
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}
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memset(&addr,0,sizeof(addr));
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addr.sin_family= AF_INET;
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addr.sin_port= htons(DNS_PORT);
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addr.sin_addr= ads->servers[ads->tcpserver].addr;
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r= connect(fd,(const struct sockaddr*)&addr,sizeof(addr));
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ads->tcpsocket= fd;
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ads->tcpstate= server_connecting;
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if (r==0) { tcp_connected(ads,now); return; }
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if (errno == EWOULDBLOCK || errno == EINPROGRESS) {
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ads->tcptimeout= now;
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timevaladd(&ads->tcptimeout,TCPCONNMS);
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return;
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}
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adns__tcp_broken(ads,"connect",strerror(errno));
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ads->tcpstate= server_disconnected;
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}
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}
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/* Timeout handling functions. */
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void adns__must_gettimeofday(adns_state ads, const struct timeval **now_io,
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struct timeval *tv_buf) {
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const struct timeval *now;
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int r;
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now= *now_io;
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if (now) return;
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r= gettimeofday(tv_buf,0); if (!r) { *now_io= tv_buf; return; }
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adns__diag(ads,-1,0,"gettimeofday failed: %s",strerror(errno));
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adns_globalsystemfailure(ads);
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return;
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}
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static void inter_immed(struct timeval **tv_io, struct timeval *tvbuf) {
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struct timeval *rbuf;
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if (!tv_io) return;
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rbuf= *tv_io;
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if (!rbuf) { *tv_io= rbuf= tvbuf; }
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timerclear(rbuf);
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}
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static void inter_maxto(struct timeval **tv_io, struct timeval *tvbuf,
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struct timeval maxto) {
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struct timeval *rbuf;
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if (!tv_io) return;
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rbuf= *tv_io;
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if (!rbuf) {
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*tvbuf= maxto; *tv_io= tvbuf;
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} else {
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if (timercmp(rbuf,&maxto,>)) *rbuf= maxto;
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}
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/*fprintf(stderr,"inter_maxto maxto=%ld.%06ld result=%ld.%06ld\n",
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maxto.tv_sec,maxto.tv_usec,(**tv_io).tv_sec,(**tv_io).tv_usec);*/
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}
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static void inter_maxtoabs(struct timeval **tv_io, struct timeval *tvbuf,
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struct timeval now, struct timeval maxtime) {
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/* tv_io may be 0 */
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ldiv_t dr;
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/*fprintf(stderr,"inter_maxtoabs now=%ld.%06ld maxtime=%ld.%06ld\n",
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now.tv_sec,now.tv_usec,maxtime.tv_sec,maxtime.tv_usec);*/
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if (!tv_io) return;
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maxtime.tv_sec -= (now.tv_sec+2);
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maxtime.tv_usec -= (now.tv_usec-2000000);
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dr= ldiv(maxtime.tv_usec,1000000);
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maxtime.tv_sec += dr.quot;
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maxtime.tv_usec -= dr.quot*1000000;
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if (maxtime.tv_sec<0) timerclear(&maxtime);
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inter_maxto(tv_io,tvbuf,maxtime);
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}
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static void timeouts_queue(adns_state ads, int act,
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struct timeval **tv_io, struct timeval *tvbuf,
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struct timeval now, struct query_queue *queue) {
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adns_query qu, nqu;
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for (qu= queue->head; qu; qu= nqu) {
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nqu= qu->next;
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if (!timercmp(&now,&qu->timeout,>)) {
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inter_maxtoabs(tv_io,tvbuf,now,qu->timeout);
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} else {
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if (!act) { inter_immed(tv_io,tvbuf); return; }
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LIST_UNLINK(*queue,qu);
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if (qu->state != query_tosend) {
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adns__query_fail(qu,adns_s_timeout);
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} else {
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adns__query_send(qu,now);
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}
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nqu= queue->head;
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}
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}
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}
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static void tcp_events(adns_state ads, int act,
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struct timeval **tv_io, struct timeval *tvbuf,
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struct timeval now) {
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adns_query qu, nqu;
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for (;;) {
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switch (ads->tcpstate) {
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case server_broken:
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if (!act) { inter_immed(tv_io,tvbuf); return; }
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for (qu= ads->tcpw.head; qu; qu= nqu) {
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nqu= qu->next;
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assert(qu->state == query_tcpw);
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if (qu->retries > ads->nservers) {
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LIST_UNLINK(ads->tcpw,qu);
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adns__query_fail(qu,adns_s_allservfail);
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}
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}
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ads->tcpstate= server_disconnected;
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case server_disconnected: /* fall through */
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if (!ads->tcpw.head) return;
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if (!act) { inter_immed(tv_io,tvbuf); return; }
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adns__tcp_tryconnect(ads,now);
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break;
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case server_ok:
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if (ads->tcpw.head) return;
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if (!ads->tcptimeout.tv_sec) {
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assert(!ads->tcptimeout.tv_usec);
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ads->tcptimeout= now;
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timevaladd(&ads->tcptimeout,TCPIDLEMS);
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}
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case server_connecting: /* fall through */
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if (!act || !timercmp(&now,&ads->tcptimeout,>)) {
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inter_maxtoabs(tv_io,tvbuf,now,ads->tcptimeout);
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return;
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} {
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/* TCP timeout has happened */
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switch (ads->tcpstate) {
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case server_connecting: /* failed to connect */
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adns__tcp_broken(ads,"unable to make connection","timed out");
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break;
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case server_ok: /* idle timeout */
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tcp_close(ads);
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ads->tcpstate= server_disconnected;
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return;
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default:
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abort();
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}
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}
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break;
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default:
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abort();
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}
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}
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return;
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}
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void adns__timeouts(adns_state ads, int act,
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struct timeval **tv_io, struct timeval *tvbuf,
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struct timeval now) {
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timeouts_queue(ads,act,tv_io,tvbuf,now, &ads->udpw);
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timeouts_queue(ads,act,tv_io,tvbuf,now, &ads->tcpw);
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tcp_events(ads,act,tv_io,tvbuf,now);
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}
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void adns_firsttimeout(adns_state ads,
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struct timeval **tv_io, struct timeval *tvbuf,
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struct timeval now) {
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adns__consistency(ads,0,cc_entex);
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adns__timeouts(ads, 0, tv_io,tvbuf, now);
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adns__consistency(ads,0,cc_entex);
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}
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void adns_processtimeouts(adns_state ads, const struct timeval *now) {
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struct timeval tv_buf;
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adns__consistency(ads,0,cc_entex);
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adns__must_gettimeofday(ads,&now,&tv_buf);
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if (now) adns__timeouts(ads, 1, 0,0, *now);
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adns__consistency(ads,0,cc_entex);
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}
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/* fd handling functions. These are the top-level of the real work of
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* reception and often transmission.
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*/
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int adns__pollfds(adns_state ads, struct adns_pollfd pollfds_buf[MAX_POLLFDS]) {
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/* Returns the number of entries filled in. Always zeroes revents. */
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assert(MAX_POLLFDS==2);
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pollfds_buf[0].fd= ads->udpsocket;
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pollfds_buf[0].events= ADNS_POLLIN;
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pollfds_buf[0].revents= 0;
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switch (ads->tcpstate) {
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case server_disconnected:
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case server_broken:
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return 1;
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case server_connecting:
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pollfds_buf[1].events= ADNS_POLLOUT;
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break;
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case server_ok:
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#if 0
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pollfds_buf[1].events= ads->tcpsend.used ? ADNS_POLLIN|ADNS_POLLOUT|ADNS_POLLPRI : ADNS_POLLIN|ADNS_POLLPRI;
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#endif
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pollfds_buf[1].events= ADNS_POLLIN|ADNS_POLLOUT|ADNS_POLLPRI;
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break;
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default:
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abort();
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}
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pollfds_buf[1].fd= ads->tcpsocket;
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return 2;
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}
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int adns_processreadable(adns_state ads, int fd, const struct timeval *now) {
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int want, dgramlen, r, serv, old_skip;
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socklen_t udpaddrlen;
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byte udpbuf[DNS_MAXUDP];
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struct sockaddr_in udpaddr;
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|
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adns__consistency(ads,0,cc_entex);
|
|
|
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switch (ads->tcpstate) {
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case server_disconnected:
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case server_broken:
|
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case server_connecting:
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break;
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case server_ok:
|
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if (fd != ads->tcpsocket) break;
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assert(!ads->tcprecv_skip);
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do {
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if (ads->tcprecv.used >= ads->tcprecv_skip+2) {
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dgramlen= ((ads->tcprecv.buf[ads->tcprecv_skip]<<8) |
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ads->tcprecv.buf[ads->tcprecv_skip+1]);
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if (ads->tcprecv.used >= ads->tcprecv_skip+2+dgramlen) {
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old_skip= ads->tcprecv_skip;
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ads->tcprecv_skip += 2+dgramlen;
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adns__procdgram(ads, ads->tcprecv.buf+old_skip+2,
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dgramlen, ads->tcpserver, 1,*now);
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continue;
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} else {
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want= 2+dgramlen;
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}
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} else {
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want= 2;
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}
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ads->tcprecv.used -= ads->tcprecv_skip;
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memmove(ads->tcprecv.buf,ads->tcprecv.buf+ads->tcprecv_skip,ads->tcprecv.used);
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ads->tcprecv_skip= 0;
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if (!adns__vbuf_ensure(&ads->tcprecv,want)) { r= ENOMEM; goto xit; }
|
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assert(ads->tcprecv.used <= ads->tcprecv.avail);
|
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if (ads->tcprecv.used == ads->tcprecv.avail) continue;
|
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r= read(ads->tcpsocket,
|
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ads->tcprecv.buf+ads->tcprecv.used,
|
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ads->tcprecv.avail-ads->tcprecv.used);
|
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if (r>0) {
|
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ads->tcprecv.used+= r;
|
|
} else {
|
|
if (r) {
|
|
if (errno==EAGAIN || errno==EWOULDBLOCK) { r= 0; goto xit; }
|
|
if (errno==EINTR) continue;
|
|
if (errno_resources(errno)) { r= errno; goto xit; }
|
|
}
|
|
adns__tcp_broken(ads,"read",r?strerror(errno):"closed");
|
|
}
|
|
} while (ads->tcpstate == server_ok);
|
|
r= 0; goto xit;
|
|
default:
|
|
abort();
|
|
}
|
|
if (fd == ads->udpsocket) {
|
|
for (;;) {
|
|
udpaddrlen= sizeof(udpaddr);
|
|
r= recvfrom(ads->udpsocket,udpbuf,sizeof(udpbuf),0,
|
|
(struct sockaddr*)&udpaddr,&udpaddrlen);
|
|
if (r<0) {
|
|
if (errno == EAGAIN || errno == EWOULDBLOCK) { r= 0; goto xit; }
|
|
if (errno == EINTR) continue;
|
|
if (errno_resources(errno)) { r= errno; goto xit; }
|
|
adns__warn(ads,-1,0,"datagram receive error: %s",strerror(errno));
|
|
r= 0; goto xit;
|
|
}
|
|
if (udpaddrlen != sizeof(udpaddr)) {
|
|
adns__diag(ads,-1,0,"datagram received with wrong address length %d"
|
|
" (expected %lu)", udpaddrlen,
|
|
(unsigned long)sizeof(udpaddr));
|
|
continue;
|
|
}
|
|
if (udpaddr.sin_family != AF_INET) {
|
|
adns__diag(ads,-1,0,"datagram received with wrong protocol family"
|
|
" %u (expected %u)",udpaddr.sin_family,AF_INET);
|
|
continue;
|
|
}
|
|
if (ntohs(udpaddr.sin_port) != DNS_PORT) {
|
|
adns__diag(ads,-1,0,"datagram received from wrong port %u (expected %u)",
|
|
ntohs(udpaddr.sin_port),DNS_PORT);
|
|
continue;
|
|
}
|
|
for (serv= 0;
|
|
serv < ads->nservers &&
|
|
ads->servers[serv].addr.s_addr != udpaddr.sin_addr.s_addr;
|
|
serv++);
|
|
if (serv >= ads->nservers) {
|
|
adns__warn(ads,-1,0,"datagram received from unknown nameserver %s",
|
|
inetntoa((char *)&udpaddr.sin_addr));
|
|
continue;
|
|
}
|
|
adns__procdgram(ads,udpbuf,r,serv,0,*now);
|
|
}
|
|
}
|
|
r= 0;
|
|
xit:
|
|
adns__consistency(ads,0,cc_entex);
|
|
return r;
|
|
}
|
|
|
|
int adns_processwriteable(adns_state ads, int fd, const struct timeval *now) {
|
|
int r;
|
|
|
|
adns__consistency(ads,0,cc_entex);
|
|
|
|
switch (ads->tcpstate) {
|
|
case server_disconnected:
|
|
case server_broken:
|
|
break;
|
|
case server_connecting:
|
|
if (fd != ads->tcpsocket) break;
|
|
assert(ads->tcprecv.used==0);
|
|
assert(ads->tcprecv_skip==0);
|
|
for (;;) {
|
|
if (!adns__vbuf_ensure(&ads->tcprecv,1)) { r= ENOMEM; goto xit; }
|
|
r= read(ads->tcpsocket,&ads->tcprecv.buf,1);
|
|
if (r==0 || (r<0 && (errno==EAGAIN || errno==EWOULDBLOCK))) {
|
|
tcp_connected(ads,*now);
|
|
r= 0; goto xit;
|
|
}
|
|
if (r>0) {
|
|
adns__tcp_broken(ads,"connect/read","sent data before first request");
|
|
r= 0; goto xit;
|
|
}
|
|
if (errno==EINTR) continue;
|
|
if (errno_resources(errno)) { r= errno; goto xit; }
|
|
adns__tcp_broken(ads,"connect/read",strerror(errno));
|
|
r= 0; goto xit;
|
|
} /* not reached */
|
|
case server_ok:
|
|
if (fd != ads->tcpsocket) break;
|
|
while (ads->tcpsend.used) {
|
|
r= write(ads->tcpsocket,ads->tcpsend.buf,ads->tcpsend.used);
|
|
if (r<0) {
|
|
if (errno==EINTR) continue;
|
|
if (errno==EAGAIN || errno==EWOULDBLOCK) { r= 0; goto xit; }
|
|
if (errno_resources(errno)) { r= errno; goto xit; }
|
|
adns__tcp_broken(ads,"write",strerror(errno));
|
|
r= 0; goto xit;
|
|
} else if (r>0) {
|
|
ads->tcpsend.used -= r;
|
|
memmove(ads->tcpsend.buf,ads->tcpsend.buf+r,ads->tcpsend.used);
|
|
}
|
|
}
|
|
r= 0;
|
|
goto xit;
|
|
default:
|
|
abort();
|
|
}
|
|
r= 0;
|
|
xit:
|
|
adns__consistency(ads,0,cc_entex);
|
|
return r;
|
|
}
|
|
|
|
int adns_processexceptional(adns_state ads, int fd, const struct timeval *now) {
|
|
adns__consistency(ads,0,cc_entex);
|
|
switch (ads->tcpstate) {
|
|
case server_disconnected:
|
|
case server_broken:
|
|
break;
|
|
case server_connecting:
|
|
case server_ok:
|
|
if (fd != ads->tcpsocket) break;
|
|
adns__tcp_broken(ads,"poll/select","exceptional condition detected");
|
|
break;
|
|
default:
|
|
abort();
|
|
}
|
|
adns__consistency(ads,0,cc_entex);
|
|
return 0;
|
|
}
|
|
|
|
static void fd_event(adns_state ads, int fd,
|
|
int revent, int pollflag,
|
|
int maxfd, const fd_set *fds,
|
|
int (*func)(adns_state, int fd, const struct timeval *now),
|
|
struct timeval now, int *r_r) {
|
|
int r;
|
|
|
|
if (!(revent & pollflag)) return;
|
|
if (fds && !(fd<maxfd && FD_ISSET(fd,fds))) return;
|
|
r= func(ads,fd,&now);
|
|
if (r) {
|
|
if (r_r) {
|
|
*r_r= r;
|
|
} else {
|
|
adns__diag(ads,-1,0,"process fd failed after select: %s",strerror(errno));
|
|
adns_globalsystemfailure(ads);
|
|
}
|
|
}
|
|
}
|
|
|
|
void adns__fdevents(adns_state ads,
|
|
const struct adns_pollfd *pollfds, int npollfds,
|
|
int maxfd, const fd_set *readfds,
|
|
const fd_set *writefds, const fd_set *exceptfds,
|
|
struct timeval now, int *r_r) {
|
|
int i, fd, revents;
|
|
|
|
for (i=0; i<npollfds; i++) {
|
|
fd= pollfds[i].fd;
|
|
if (fd >= maxfd) maxfd= fd+1;
|
|
revents= pollfds[i].revents;
|
|
fd_event(ads,fd, revents,ADNS_POLLIN, maxfd,readfds, adns_processreadable,now,r_r);
|
|
fd_event(ads,fd, revents,ADNS_POLLOUT, maxfd,writefds, adns_processwriteable,now,r_r);
|
|
fd_event(ads,fd, revents,ADNS_POLLPRI, maxfd,exceptfds, adns_processexceptional,now,r_r);
|
|
}
|
|
}
|
|
|
|
/* Wrappers for select(2). */
|
|
#if 0
|
|
void adns_beforeselect(adns_state ads, int *maxfd_io, fd_set *readfds_io,
|
|
fd_set *writefds_io, fd_set *exceptfds_io,
|
|
struct timeval **tv_mod, struct timeval *tv_tobuf,
|
|
const struct timeval *now) {
|
|
struct timeval tv_nowbuf;
|
|
struct adns_pollfd pollfds[MAX_POLLFDS];
|
|
int i, fd, maxfd, npollfds;
|
|
|
|
adns__consistency(ads,0,cc_entex);
|
|
|
|
if (tv_mod && (!*tv_mod || (*tv_mod)->tv_sec || (*tv_mod)->tv_usec)) {
|
|
/* The caller is planning to sleep. */
|
|
adns__must_gettimeofday(ads,&now,&tv_nowbuf);
|
|
if (!now) { inter_immed(tv_mod,tv_tobuf); goto xit; }
|
|
adns__timeouts(ads, 0, tv_mod,tv_tobuf, *now);
|
|
}
|
|
|
|
npollfds= adns__pollfds(ads,pollfds);
|
|
maxfd= *maxfd_io;
|
|
for (i=0; i<npollfds; i++) {
|
|
fd= pollfds[i].fd;
|
|
if (fd >= maxfd) maxfd= fd+1;
|
|
if (pollfds[i].events & ADNS_POLLIN) FD_SET(fd,readfds_io);
|
|
if (pollfds[i].events & ADNS_POLLOUT) FD_SET(fd,writefds_io);
|
|
if (pollfds[i].events & ADNS_POLLPRI) FD_SET(fd,exceptfds_io);
|
|
}
|
|
*maxfd_io= maxfd;
|
|
|
|
xit:
|
|
adns__consistency(ads,0,cc_entex);
|
|
}
|
|
|
|
void adns_afterselect(adns_state ads, int maxfd, const fd_set *readfds,
|
|
const fd_set *writefds, const fd_set *exceptfds,
|
|
const struct timeval *now) {
|
|
struct timeval tv_buf;
|
|
struct adns_pollfd pollfds[MAX_POLLFDS];
|
|
int npollfds, i;
|
|
|
|
adns__consistency(ads,0,cc_entex);
|
|
adns__must_gettimeofday(ads,&now,&tv_buf);
|
|
if (!now) goto xit;
|
|
adns_processtimeouts(ads,now);
|
|
|
|
npollfds= adns__pollfds(ads,pollfds);
|
|
for (i=0; i<npollfds; i++) pollfds[i].revents= ADNS_POLLIN|ADNS_POLLOUT|ADNS_POLLPRI;
|
|
adns__fdevents(ads,
|
|
pollfds,npollfds,
|
|
maxfd,readfds,writefds,exceptfds,
|
|
*now, 0);
|
|
xit:
|
|
adns__consistency(ads,0,cc_entex);
|
|
}
|
|
#endif
|
|
/* General helpful functions. */
|
|
|
|
void adns_globalsystemfailure(adns_state ads) {
|
|
adns__consistency(ads,0,cc_entex);
|
|
|
|
while (ads->udpw.head) adns__query_fail(ads->udpw.head, adns_s_systemfail);
|
|
while (ads->tcpw.head) adns__query_fail(ads->tcpw.head, adns_s_systemfail);
|
|
|
|
switch (ads->tcpstate) {
|
|
case server_connecting:
|
|
case server_ok:
|
|
adns__tcp_broken(ads,0,0);
|
|
break;
|
|
case server_disconnected:
|
|
case server_broken:
|
|
break;
|
|
default:
|
|
abort();
|
|
}
|
|
adns__consistency(ads,0,cc_entex);
|
|
}
|
|
|
|
int adns_processany(adns_state ads) {
|
|
int r, i;
|
|
struct timeval now;
|
|
struct adns_pollfd pollfds[MAX_POLLFDS];
|
|
int npollfds;
|
|
|
|
adns__consistency(ads,0,cc_entex);
|
|
|
|
r= gettimeofday(&now,0);
|
|
if (!r) adns_processtimeouts(ads,&now);
|
|
|
|
/* We just use adns__fdevents to loop over the fd's trying them.
|
|
* This seems more sensible than calling select, since we're most
|
|
* likely just to want to do a read on one or two fds anyway.
|
|
*/
|
|
npollfds= adns__pollfds(ads,pollfds);
|
|
for (i=0; i<npollfds; i++) pollfds[i].revents= pollfds[i].events & ~ADNS_POLLPRI;
|
|
adns__fdevents(ads,
|
|
pollfds,npollfds,
|
|
0,0,0,0,
|
|
now,&r);
|
|
|
|
adns__consistency(ads,0,cc_entex);
|
|
return 0;
|
|
}
|
|
|
|
void adns__autosys(adns_state ads, struct timeval now) {
|
|
if (ads->iflags & adns_if_noautosys) return;
|
|
adns_processany(ads);
|
|
}
|
|
|
|
int adns__internal_check(adns_state ads,
|
|
adns_query *query_io,
|
|
adns_answer **answer,
|
|
void **context_r) {
|
|
adns_query qu;
|
|
|
|
qu= *query_io;
|
|
if (!qu) {
|
|
if (ads->output.head) {
|
|
qu= ads->output.head;
|
|
} else if (ads->udpw.head || ads->tcpw.head) {
|
|
return EAGAIN;
|
|
} else {
|
|
return ESRCH;
|
|
}
|
|
} else {
|
|
if (qu->id>=0) return EAGAIN;
|
|
}
|
|
LIST_UNLINK(ads->output,qu);
|
|
*answer= qu->answer;
|
|
if (context_r) *context_r= qu->ctx.ext;
|
|
*query_io= qu;
|
|
MyFree(qu);
|
|
return 0;
|
|
}
|
|
|
|
#if 0
|
|
int adns_wait(adns_state ads,
|
|
adns_query *query_io,
|
|
adns_answer **answer_r,
|
|
void **context_r) {
|
|
int r, maxfd, rsel;
|
|
fd_set readfds, writefds, exceptfds;
|
|
struct timeval tvbuf, *tvp;
|
|
|
|
adns__consistency(ads,*query_io,cc_entex);
|
|
for (;;) {
|
|
r= adns__internal_check(ads,query_io,answer_r,context_r);
|
|
if (r != EAGAIN) break;
|
|
maxfd= 0; tvp= 0;
|
|
FD_ZERO(&readfds); FD_ZERO(&writefds); FD_ZERO(&exceptfds);
|
|
adns_beforeselect(ads,&maxfd,&readfds,&writefds,&exceptfds,&tvp,&tvbuf,0);
|
|
assert(tvp);
|
|
rsel= select(maxfd,&readfds,&writefds,&exceptfds,tvp);
|
|
if (rsel==-1) {
|
|
if (errno == EINTR) {
|
|
if (ads->iflags & adns_if_eintr) { r= EINTR; break; }
|
|
} else {
|
|
adns__diag(ads,-1,0,"select failed in wait: %s",strerror(errno));
|
|
adns_globalsystemfailure(ads);
|
|
}
|
|
} else {
|
|
assert(rsel >= 0);
|
|
adns_afterselect(ads,maxfd,&readfds,&writefds,&exceptfds,0);
|
|
}
|
|
}
|
|
adns__consistency(ads,0,cc_entex);
|
|
return r;
|
|
}
|
|
#endif
|
|
int adns_check(adns_state ads,
|
|
adns_query *query_io,
|
|
adns_answer **answer_r,
|
|
void **context_r) {
|
|
struct timeval now;
|
|
int r;
|
|
|
|
adns__consistency(ads,*query_io,cc_entex);
|
|
r= gettimeofday(&now,0);
|
|
if (!r) adns__autosys(ads,now);
|
|
|
|
r= adns__internal_check(ads,query_io,answer_r,context_r);
|
|
adns__consistency(ads,0,cc_entex);
|
|
return r;
|
|
}
|