* - user-visible check/wait and event-loop-related functions
*/
/*
- * This file is
- * Copyright (C) 1997-2000 Ian Jackson <ian@davenant.greenend.org.uk>
- *
- * It is part of adns, which is
- * Copyright (C) 1997-2000 Ian Jackson <ian@davenant.greenend.org.uk>
- * Copyright (C) 1999-2000 Tony Finch <dot@dotat.at>
+ * This file is part of adns, which is
+ * Copyright (C) 1997-2000,2003,2006,2014 Ian Jackson
+ * Copyright (C) 2014 Mark Wooding
+ * Copyright (C) 1999-2000,2003,2006 Tony Finch
+ * Copyright (C) 1991 Massachusetts Institute of Technology
+ * (See the file INSTALL for full details.)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2, or (at your option)
+ * the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software Foundation,
- * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ * along with this program; if not, write to the Free Software Foundation.
*/
#include <errno.h>
/* TCP connection management. */
static void tcp_close(adns_state ads) {
- int serv;
-
- serv= ads->tcpserver;
close(ads->tcpsocket);
ads->tcpsocket= -1;
ads->tcprecv.used= ads->tcprecv_skip= ads->tcpsend.used= 0;
}
}
+static void tcp_broken_events(adns_state ads) {
+ adns_query qu, nqu;
+
+ assert(ads->tcpstate == server_broken);
+ 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;
+}
+
void adns__tcp_tryconnect(adns_state ads, struct timeval now) {
int r, fd, tries;
- struct sockaddr_in addr;
+ adns_rr_addr *addr;
struct protoent *proto;
for (tries=0; tries<ads->nservers; tries++) {
adns__diag(ads,-1,0,"unable to find protocol no. for TCP !");
return;
}
- fd= socket(AF_INET,SOCK_STREAM,proto->p_proto);
+ addr = &ads->servers[ads->tcpserver];
+ fd= socket(addr->addr.sa.sa_family, SOCK_STREAM, proto->p_proto);
if (fd<0) {
adns__diag(ads,-1,0,"cannot create TCP socket: %s",strerror(errno));
return;
close(fd);
return;
}
- memset(&addr,0,sizeof(addr));
- addr.sin_family= AF_INET;
- addr.sin_port= htons(DNS_PORT);
- addr.sin_addr= ads->servers[ads->tcpserver].addr;
- r= connect(fd,(const struct sockaddr*)&addr,sizeof(addr));
+ r= connect(fd,&addr->addr.sa,addr->len);
ads->tcpsocket= fd;
ads->tcpstate= server_connecting;
if (r==0) { tcp_connected(ads,now); return; }
return;
}
adns__tcp_broken(ads,"connect",strerror(errno));
- ads->tcpstate= server_disconnected;
+ tcp_broken_events(ads);
}
}
static void tcp_events(adns_state ads, int act,
struct timeval **tv_io, struct timeval *tvbuf,
struct timeval now) {
- adns_query qu, nqu;
-
for (;;) {
switch (ads->tcpstate) {
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;
+ tcp_broken_events(ads);
case server_disconnected: /* fall through */
if (!ads->tcpw.head) return;
if (!act) { inter_immed(tv_io,tvbuf); return; }
struct timeval now) {
adns__consistency(ads,0,cc_entex);
adns__timeouts(ads, 0, tv_io,tvbuf, now);
- adns__consistency(ads,0,cc_entex);
+ adns__returning(ads,0);
}
void adns_processtimeouts(adns_state ads, const struct timeval *now) {
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);
+ adns__returning(ads,0);
}
/* fd handling functions. These are the top-level of the real work of
int adns__pollfds(adns_state ads, struct pollfd pollfds_buf[MAX_POLLFDS]) {
/* Returns the number of entries filled in. Always zeroes revents. */
+ int nwanted=0;
+#define ADD_POLLFD(wantfd, wantevents) do{ \
+ pollfds_buf[nwanted].fd= (wantfd); \
+ pollfds_buf[nwanted].events= (wantevents); \
+ pollfds_buf[nwanted].revents= 0; \
+ nwanted++; \
+ }while(0)
+
+ int i;
- assert(MAX_POLLFDS==2);
+ assert(MAX_POLLFDS == MAXUDP + 1);
- pollfds_buf[0].fd= ads->udpsocket;
- pollfds_buf[0].events= POLLIN;
- pollfds_buf[0].revents= 0;
+ for (i=0; i<ads->nudpsockets; i++)
+ ADD_POLLFD(ads->udpsockets[i].fd, POLLIN);
switch (ads->tcpstate) {
case server_disconnected:
case server_broken:
- return 1;
+ break;
case server_connecting:
- pollfds_buf[1].events= POLLOUT;
+ ADD_POLLFD(ads->tcpsocket, POLLOUT);
break;
case server_ok:
- pollfds_buf[1].events=
- ads->tcpsend.used ? POLLIN|POLLOUT|POLLPRI : POLLIN|POLLPRI;
+ ADD_POLLFD(ads->tcpsocket,
+ ads->tcpsend.used ? POLLIN|POLLOUT|POLLPRI : POLLIN|POLLPRI);
break;
default:
abort();
}
- pollfds_buf[1].fd= ads->tcpsocket;
- return 2;
+ assert(nwanted<=MAX_POLLFDS);
+#undef ADD_POLLFD
+ return nwanted;
}
int adns_processreadable(adns_state ads, int fd, const struct timeval *now) {
- int want, dgramlen, r, udpaddrlen, serv, old_skip;
+ int want, dgramlen, r, i, udpaddrlen, serv, old_skip;
byte udpbuf[DNS_MAXUDP];
- struct sockaddr_in udpaddr;
+ char addrbuf[ADNS_ADDR2TEXT_BUFLEN];
+ struct udpsocket *udp;
+ adns_sockaddr udpaddr;
adns__consistency(ads,0,cc_entex);
default:
abort();
}
- if (fd == ads->udpsocket) {
+ for (i=0; i<ads->nudpsockets; i++) {
+ udp= &ads->udpsockets[i];
+ if (fd != udp->fd) continue;
for (;;) {
udpaddrlen= sizeof(udpaddr);
- r= recvfrom(ads->udpsocket,udpbuf,sizeof(udpbuf),0,
- (struct sockaddr*)&udpaddr,&udpaddrlen);
+ r= recvfrom(fd,udpbuf,sizeof(udpbuf),0, &udpaddr.sa,&udpaddrlen);
if (r<0) {
if (errno == EAGAIN || errno == EWOULDBLOCK) { r= 0; goto xit; }
if (errno == EINTR) continue;
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;
+ !adns__sockaddrs_equal(&udpaddr.sa,
+ &ads->servers[serv].addr.sa);
serv++);
if (serv >= ads->nservers) {
adns__warn(ads,-1,0,"datagram received from unknown nameserver %s",
- inet_ntoa(udpaddr.sin_addr));
+ adns__sockaddr_ntoa(&udpaddr.sa, addrbuf));
continue;
}
adns__procdgram(ads,udpbuf,r,serv,0,*now);
}
+ break;
}
r= 0;
xit:
- adns__consistency(ads,0,cc_entex);
+ adns__returning(ads,0);
return r;
}
}
r= 0;
xit:
- adns__consistency(ads,0,cc_entex);
+ adns__returning(ads,0);
return r;
}
default:
abort();
}
- adns__consistency(ads,0,cc_entex);
+ adns__returning(ads,0);
return 0;
}
*maxfd_io= maxfd;
xit:
- adns__consistency(ads,0,cc_entex);
+ adns__returning(ads,0);
}
void adns_afterselect(adns_state ads, int maxfd, const fd_set *readfds,
maxfd,readfds,writefds,exceptfds,
*now, 0);
xit:
- adns__consistency(ads,0,cc_entex);
+ adns__returning(ads,0);
}
/* General helpful functions. */
default:
abort();
}
- adns__consistency(ads,0,cc_entex);
+ adns__returning(ads,0);
}
int adns_processany(adns_state ads) {
0,0,0,0,
now,&r);
- adns__consistency(ads,0,cc_entex);
+ adns__returning(ads,0);
return 0;
}
adns_afterselect(ads,maxfd,&readfds,&writefds,&exceptfds,0);
}
}
- adns__consistency(ads,0,cc_entex);
+ adns__returning(ads,0);
return r;
}
if (!r) adns__autosys(ads,now);
r= adns__internal_check(ads,query_io,answer_r,context_r);
- adns__consistency(ads,0,cc_entex);
+ adns__returning(ads,0);
return r;
}
~ianmdlvl / adns.git / blobdiff