* - 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 Tony Finch <dot@dotat.at>
+ * This file is part of adns, which is
+ * Copyright (C) 1997-2000,2003,2006 Ian Jackson
+ * 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
/* 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;
void adns__tcp_broken(adns_state ads, const char *what, const char *why) {
int serv;
+ adns_query qu;
assert(ads->tcpstate == server_connecting || ads->tcpstate == server_ok);
serv= ads->tcpserver;
if (what) adns__warn(ads,serv,0,"TCP connection failed: %s: %s",what,why);
+ if (ads->tcpstate == server_connecting) {
+ /* Counts as a retry for all the queries waiting for TCP. */
+ for (qu= ads->tcpw.head; qu; qu= qu->next)
+ qu->retries++;
+ }
+
tcp_close(ads);
ads->tcpstate= server_broken;
ads->tcpserver= (serv+1)%ads->nservers;
}
}
+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++) {
assert(!ads->tcprecv_skip);
proto= getprotobyname("tcp");
- if (!proto) { adns__diag(ads,-1,0,"unable to find protocol no. for TCP !"); return; }
- fd= socket(AF_INET,SOCK_STREAM,proto->p_proto);
+ if (!proto) {
+ adns__diag(ads,-1,0,"unable to find protocol no. for TCP !");
+ return;
+ }
+ 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;
}
r= adns__setnonblock(ads,fd);
if (r) {
- adns__diag(ads,-1,0,"cannot make TCP socket nonblocking: %s",strerror(r));
+ adns__diag(ads,-1,0,"cannot make TCP socket nonblocking:"
+ " %s",strerror(r));
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; }
pollfds_buf[1].events= POLLOUT;
break;
case server_ok:
- pollfds_buf[1].events= ads->tcpsend.used ? POLLIN|POLLOUT|POLLPRI : POLLIN|POLLPRI;
+ pollfds_buf[1].events=
+ ads->tcpsend.used ? POLLIN|POLLOUT|POLLPRI : POLLIN|POLLPRI;
break;
default:
abort();
switch (ads->tcpstate) {
case server_disconnected:
+ case server_broken:
case server_connecting:
break;
case server_ok:
want= 2;
}
ads->tcprecv.used -= ads->tcprecv_skip;
- memmove(ads->tcprecv.buf,ads->tcprecv.buf+ads->tcprecv_skip,ads->tcprecv.used);
+ 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 (udpaddrlen != sizeof(udpaddr)) {
adns__diag(ads,-1,0,"datagram received with wrong address length %d"
- " (expected %d)", udpaddrlen,sizeof(udpaddr));
+ " (expected %lu)", udpaddrlen,
+ (unsigned long)sizeof(udpaddr));
continue;
}
if (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);
+ 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__sockaddr_equal_p(&ads->servers[serv].addr.sa,
+ (const struct sockaddr *)&udpaddr);
serv++);
if (serv >= ads->nservers) {
adns__warn(ads,-1,0,"datagram received from unknown nameserver %s",
switch (ads->tcpstate) {
case server_disconnected:
+ case server_broken:
break;
case server_connecting:
if (fd != ads->tcpsocket) break;
r= 0; goto xit;
} /* not reached */
case server_ok:
- if (!(ads->tcpsend.used && fd == ads->tcpsocket)) break;
- for (;;) {
+ 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);
ads->tcpsend.used -= r;
memmove(ads->tcpsend.buf,ads->tcpsend.buf+r,ads->tcpsend.used);
}
- } /* not reached */
+ }
+ r= 0;
+ goto xit;
default:
abort();
}
return r;
}
-int adns_processexceptional(adns_state ads, int fd, const struct timeval *now) {
+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:
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),
+ int (*func)(adns_state, int fd,
+ const struct timeval *now),
struct timeval now, int *r_r) {
int r;
if (r_r) {
*r_r= r;
} else {
- adns__diag(ads,-1,0,"process fd failed after select: %s",strerror(errno));
+ adns__diag(ads,-1,0,"process fd failed after select:"
+ " %s",strerror(errno));
adns_globalsystemfailure(ads);
}
}
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);
+#define EV(pollfl,fds,how) \
+ fd_event(ads,fd, revents,pollfl, maxfd,fds, adns_process##how,now,r_r)
+ EV( POLLIN, readfds, readable );
+ EV( POLLOUT, writefds, writeable );
+ EV( POLLPRI, exceptfds, exceptional );
+#undef EV
}
}
adns__tcp_broken(ads,0,0);
break;
case server_disconnected:
+ case server_broken:
break;
default:
abort();
~mdw / adns / blobdiff