938 lines
22 KiB
C
938 lines
22 KiB
C
/* NeoStats - IRC Statistical Services
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|
** Copyright (c) 1999-2004 Adam Rutter, Justin Hammond
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** http://www.neostats.net/
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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 of the License, or
|
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** (at your option) 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
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** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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** USA
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**
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** NeoStats CVS Identification
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** $Id$
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*/
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/*
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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
|
|
* 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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#include <errno.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <netdb.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include "internal.h"
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#include "tvarith.h"
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/* TCP connection management. */
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static void tcp_close(adns_state ads)
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{
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int serv;
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serv = ads->tcpserver;
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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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{
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int serv;
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adns_query qu;
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assert(ads->tcpstate == server_connecting
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|| ads->tcpstate == server_ok);
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serv = ads->tcpserver;
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if (what)
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adns__warn(ads, serv, 0, "TCP connection failed: %s: %s",
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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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{
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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;
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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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{
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int r, fd, tries;
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struct sockaddr_in addr;
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struct protoent *proto;
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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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proto = getprotobyname("tcp");
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if (!proto) {
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adns__diag(ads, -1, 0,
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"unable to find protocol no. for TCP !");
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return;
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}
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fd = socket(AF_INET, SOCK_STREAM, proto->p_proto);
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if (fd < 0) {
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adns__diag(ads, -1, 0,
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"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,
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"cannot make TCP socket nonblocking: %s",
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strerror(r));
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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,
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sizeof(addr));
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ads->tcpsocket = fd;
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ads->tcpstate = server_connecting;
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if (r == 0) {
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tcp_connected(ads, now);
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return;
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}
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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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{
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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)
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return;
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r = gettimeofday(tv_buf, 0);
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if (!r) {
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*now_io = tv_buf;
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return;
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}
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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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{
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struct timeval *rbuf;
|
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if (!tv_io)
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return;
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rbuf = *tv_io;
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if (!rbuf) {
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*tv_io = rbuf = tvbuf;
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}
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timerclear(rbuf);
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}
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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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{
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struct timeval *rbuf;
|
|
|
|
if (!tv_io)
|
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return;
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rbuf = *tv_io;
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if (!rbuf) {
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*tvbuf = maxto;
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*tv_io = tvbuf;
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} else {
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if (timercmp(rbuf, &maxto, >))
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*rbuf = maxto;
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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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{
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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)
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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)
|
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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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{
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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) {
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inter_immed(tv_io, tvbuf);
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return;
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}
|
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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);
|
|
}
|
|
nqu = queue->head;
|
|
}
|
|
}
|
|
}
|
|
|
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static void tcp_events(adns_state ads, int act,
|
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struct timeval **tv_io, struct timeval *tvbuf,
|
|
struct timeval now)
|
|
{
|
|
adns_query qu, nqu;
|
|
|
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for (;;) {
|
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switch (ads->tcpstate) {
|
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case server_broken:
|
|
if (!act) {
|
|
inter_immed(tv_io, tvbuf);
|
|
return;
|
|
}
|
|
for (qu = ads->tcpw.head; qu; qu = nqu) {
|
|
nqu = qu->next;
|
|
assert(qu->state == query_tcpw);
|
|
if (qu->retries > ads->nservers) {
|
|
LIST_UNLINK(ads->tcpw, qu);
|
|
adns__query_fail(qu,
|
|
adns_s_allservfail);
|
|
}
|
|
}
|
|
ads->tcpstate = server_disconnected;
|
|
case server_disconnected: /* fall through */
|
|
if (!ads->tcpw.head)
|
|
return;
|
|
if (!act) {
|
|
inter_immed(tv_io, tvbuf);
|
|
return;
|
|
}
|
|
adns__tcp_tryconnect(ads, now);
|
|
break;
|
|
case server_ok:
|
|
if (ads->tcpw.head)
|
|
return;
|
|
if (!ads->tcptimeout.tv_sec) {
|
|
assert(!ads->tcptimeout.tv_usec);
|
|
ads->tcptimeout = now;
|
|
timevaladd(&ads->tcptimeout, TCPIDLEMS);
|
|
}
|
|
case server_connecting: /* fall through */
|
|
if (!act || !timercmp(&now, &ads->tcptimeout, >)) {
|
|
inter_maxtoabs(tv_io, tvbuf, now,
|
|
ads->tcptimeout);
|
|
return;
|
|
}
|
|
{
|
|
/* TCP timeout has happened */
|
|
switch (ads->tcpstate) {
|
|
case server_connecting: /* failed to connect */
|
|
adns__tcp_broken(ads,
|
|
"unable to make connection",
|
|
"timed out");
|
|
break;
|
|
case server_ok: /* idle timeout */
|
|
tcp_close(ads);
|
|
ads->tcpstate =
|
|
server_disconnected;
|
|
return;
|
|
default:
|
|
abort();
|
|
}
|
|
}
|
|
break;
|
|
default:
|
|
abort();
|
|
}
|
|
}
|
|
return;
|
|
}
|
|
|
|
void adns__timeouts(adns_state ads, int act,
|
|
struct timeval **tv_io, struct timeval *tvbuf,
|
|
struct timeval now)
|
|
{
|
|
timeouts_queue(ads, act, tv_io, tvbuf, now, &ads->udpw);
|
|
timeouts_queue(ads, act, tv_io, tvbuf, now, &ads->tcpw);
|
|
tcp_events(ads, act, tv_io, tvbuf, now);
|
|
}
|
|
|
|
void adns_firsttimeout(adns_state ads,
|
|
struct timeval **tv_io, struct timeval *tvbuf,
|
|
struct timeval now)
|
|
{
|
|
adns__consistency(ads, 0, cc_entex);
|
|
adns__timeouts(ads, 0, tv_io, tvbuf, now);
|
|
adns__consistency(ads, 0, cc_entex);
|
|
}
|
|
|
|
void adns_processtimeouts(adns_state ads, const struct timeval *now)
|
|
{
|
|
struct timeval tv_buf;
|
|
|
|
adns__consistency(ads, 0, cc_entex);
|
|
adns__must_gettimeofday(ads, &now, &tv_buf);
|
|
if (now)
|
|
adns__timeouts(ads, 1, 0, 0, *now);
|
|
adns__consistency(ads, 0, cc_entex);
|
|
}
|
|
|
|
/* fd handling functions. These are the top-level of the real work of
|
|
* reception and often transmission.
|
|
*/
|
|
|
|
int adns__pollfds(adns_state ads, struct pollfd pollfds_buf[MAX_POLLFDS])
|
|
{
|
|
/* Returns the number of entries filled in. Always zeroes revents. */
|
|
|
|
assert(MAX_POLLFDS == 2);
|
|
|
|
pollfds_buf[0].fd = ads->udpsocket;
|
|
pollfds_buf[0].events = POLLIN;
|
|
pollfds_buf[0].revents = 0;
|
|
|
|
switch (ads->tcpstate) {
|
|
case server_disconnected:
|
|
case server_broken:
|
|
return 1;
|
|
case server_connecting:
|
|
pollfds_buf[1].events = POLLOUT;
|
|
break;
|
|
case server_ok:
|
|
pollfds_buf[1].events =
|
|
ads->tcpsend.
|
|
used ? POLLIN | POLLOUT | POLLPRI : POLLIN | POLLPRI;
|
|
break;
|
|
default:
|
|
abort();
|
|
}
|
|
pollfds_buf[1].fd = ads->tcpsocket;
|
|
return 2;
|
|
}
|
|
|
|
int adns_processreadable(adns_state ads, int fd, const struct timeval *now)
|
|
{
|
|
int want, dgramlen, r, udpaddrlen, serv, old_skip;
|
|
byte udpbuf[DNS_MAXUDP];
|
|
struct sockaddr_in udpaddr;
|
|
|
|
adns__consistency(ads, 0, cc_entex);
|
|
|
|
switch (ads->tcpstate) {
|
|
case server_disconnected:
|
|
case server_broken:
|
|
case server_connecting:
|
|
break;
|
|
case server_ok:
|
|
if (fd != ads->tcpsocket)
|
|
break;
|
|
assert(!ads->tcprecv_skip);
|
|
do {
|
|
if (ads->tcprecv.used >= ads->tcprecv_skip + 2) {
|
|
dgramlen =
|
|
((ads->tcprecv.
|
|
buf[ads->tcprecv_skip] << 8) | ads->
|
|
tcprecv.buf[ads->tcprecv_skip + 1]);
|
|
if (ads->tcprecv.used >=
|
|
ads->tcprecv_skip + 2 + dgramlen) {
|
|
old_skip = ads->tcprecv_skip;
|
|
ads->tcprecv_skip += 2 + dgramlen;
|
|
adns__procdgram(ads,
|
|
ads->tcprecv.buf +
|
|
old_skip + 2,
|
|
dgramlen,
|
|
ads->tcpserver, 1,
|
|
*now);
|
|
continue;
|
|
} else {
|
|
want = 2 + dgramlen;
|
|
}
|
|
} else {
|
|
want = 2;
|
|
}
|
|
ads->tcprecv.used -= ads->tcprecv_skip;
|
|
memmove(ads->tcprecv.buf,
|
|
ads->tcprecv.buf + ads->tcprecv_skip,
|
|
ads->tcprecv.used);
|
|
ads->tcprecv_skip = 0;
|
|
if (!adns__vbuf_ensure(&ads->tcprecv, want)) {
|
|
r = ENOMEM;
|
|
goto xit;
|
|
}
|
|
assert(ads->tcprecv.used <= ads->tcprecv.avail);
|
|
if (ads->tcprecv.used == ads->tcprecv.avail)
|
|
continue;
|
|
r = read(ads->tcpsocket,
|
|
ads->tcprecv.buf + ads->tcprecv.used,
|
|
ads->tcprecv.avail - ads->tcprecv.used);
|
|
if (r > 0) {
|
|
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",
|
|
inet_ntoa(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) {
|
|
adns__sigpipe_protect(ads);
|
|
r = write(ads->tcpsocket, ads->tcpsend.buf,
|
|
ads->tcpsend.used);
|
|
adns__sigpipe_unprotect(ads);
|
|
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 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, POLLIN, maxfd, readfds,
|
|
adns_processreadable, now, r_r);
|
|
fd_event(ads, fd, revents, POLLOUT, maxfd, writefds,
|
|
adns_processwriteable, now, r_r);
|
|
fd_event(ads, fd, revents, POLLPRI, maxfd, exceptfds,
|
|
adns_processexceptional, now, r_r);
|
|
}
|
|
}
|
|
|
|
/* Wrappers for select(2). */
|
|
|
|
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 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);
|
|
adns__consistency(ads, 0, cc_entex);
|
|
return;
|
|
#if 0
|
|
goto xit;
|
|
#endif
|
|
}
|
|
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 & POLLIN)
|
|
FD_SET(fd, readfds_io);
|
|
if (pollfds[i].events & POLLOUT)
|
|
FD_SET(fd, writefds_io);
|
|
if (pollfds[i].events & POLLPRI)
|
|
FD_SET(fd, exceptfds_io);
|
|
}
|
|
*maxfd_io = maxfd;
|
|
#if 0
|
|
xit:
|
|
#endif
|
|
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 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 = POLLIN | POLLOUT | POLLPRI;
|
|
adns__fdevents(ads,
|
|
pollfds, npollfds,
|
|
maxfd, readfds, writefds, exceptfds, *now, 0);
|
|
xit:
|
|
adns__consistency(ads, 0, cc_entex);
|
|
}
|
|
|
|
/* 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 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 & ~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;
|
|
free(qu);
|
|
return 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;
|
|
}
|
|
|
|
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;
|
|
}
|