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o Protect against expected NULL fdset pointers.

Browse Source 
o Log FD_SET()s in LogTIMER.
o Identify the descriptor that causes an EBADF from select()
  if LogTIMER is enabled (then exit).
o Call the MP server UpdateSet() function after calling
  the UpdateSet() for all links - the link may enter
  PHASE_TERMINATE and bring down the MP server - breaking
  the imminent select().
This commit is contained in:
Brian Somers 1998-05-10 22:20:20 +00:00
parent e8607d386f
commit 24989c68ac
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/cvs2svn/branches/MP/; revision=35924
6 changed files with 51 additions and 11 deletions
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5
usr.sbin/ppp/bundle.c
View File

@ -23,7 +23,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: bundle.c,v 1.1.2.79 1998/05/09 14:44:11 brian Exp $
* $Id: bundle.c,v 1.1.2.80 1998/05/10 10:21:10 brian Exp $
*/
#include <sys/types.h>
@ -373,10 +373,11 @@ bundle_UpdateSet(struct descriptor *d, fd_set *r, fd_set *w, fd_set *e, int *n)
result += descriptor_UpdateSet(desc, r, w, e, n);
/* If there are aren't many packets queued, look for some more. */
if (bundle->links && bundle_FillQueues(bundle) < 20) {
if (r && bundle->links && bundle_FillQueues(bundle) < 20) {
if (*n < bundle->dev.fd + 1)
*n = bundle->dev.fd + 1;
FD_SET(bundle->dev.fd, r);
log_Printf(LogTIMER, "tun: fdset(r) %d\n", bundle->dev.fd);
result++;
}

42
usr.sbin/ppp/main.c
View File

@ -17,7 +17,7 @@
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* $Id: main.c,v 1.121.2.57 1998/05/08 01:15:11 brian Exp $
* $Id: main.c,v 1.121.2.58 1998/05/08 18:50:21 brian Exp $
*
* TODO:
*/
@ -36,6 +36,7 @@
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <sys/time.h>
#include <termios.h>
#include <unistd.h>
@ -473,11 +474,10 @@ DoLoop(struct bundle *bundle, struct prompt *prompt)
sig_Handle();
/* This may nuke a datalink */
descriptor_UpdateSet(&bundle->ncp.mp.server.desc, &rfds, &wfds,
&efds, &nfds);
descriptor_UpdateSet(&bundle->desc, &rfds, &wfds, &efds, &nfds);
descriptor_UpdateSet(&server.desc, &rfds, &wfds, &efds, &nfds);
descriptor_UpdateSet(&bundle->ncp.mp.server.desc, &rfds, &wfds,
&efds, &nfds);
if (bundle_IsDead(bundle))
/* Don't select - we'll be here forever */
@ -491,6 +491,39 @@ DoLoop(struct bundle *bundle, struct prompt *prompt)
if (errno == EINTR)
continue;
log_Printf(LogERROR, "DoLoop: select(): %s\n", strerror(errno));
if (log_IsKept(LogTIMER)) {
struct timeval t;
for (i = 0; i <= nfds; i++) {
if (FD_ISSET(i, &rfds)) {
log_Printf(LogTIMER, "Read set contains %d\n", i);
FD_CLR(i, &rfds);
t.tv_sec = t.tv_usec = 0;
if (select(nfds, &rfds, &wfds, &efds, &t) != -1) {
log_Printf(LogTIMER, "The culprit !\n");
break;
}
}
if (FD_ISSET(i, &wfds)) {
log_Printf(LogTIMER, "Write set contains %d\n", i);
FD_CLR(i, &wfds);
t.tv_sec = t.tv_usec = 0;
if (select(nfds, &rfds, &wfds, &efds, &t) != -1) {
log_Printf(LogTIMER, "The culprit !\n");
break;
}
}
if (FD_ISSET(i, &efds)) {
log_Printf(LogTIMER, "Error set contains %d\n", i);
FD_CLR(i, &efds);
t.tv_sec = t.tv_usec = 0;
if (select(nfds, &rfds, &wfds, &efds, &t) != -1) {
log_Printf(LogTIMER, "The culprit !\n");
break;
}
}
}
}
break;
}
@ -512,7 +545,6 @@ DoLoop(struct bundle *bundle, struct prompt *prompt)
if (descriptor_IsSet(&bundle->desc, &wfds))
descriptor_Write(&bundle->desc, bundle, &wfds);
/* This may add a datalink */
if (descriptor_IsSet(&bundle->desc, &rfds))
descriptor_Read(&bundle->desc, bundle, &rfds);
} while (bundle_CleanDatalinks(bundle), !bundle_IsDead(bundle));

3
usr.sbin/ppp/mp.c
View File

@ -23,7 +23,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: mp.c,v 1.1.2.25 1998/05/06 23:49:48 brian Exp $
* $Id: mp.c,v 1.1.2.26 1998/05/08 01:15:16 brian Exp $
*/
#include <sys/types.h>
@ -848,6 +848,7 @@ mpserver_UpdateSet(struct descriptor *d, fd_set *r, fd_set *w, fd_set *e,
if (*n < s->fd + 1)
*n = s->fd + 1;
FD_SET(s->fd, r);
log_Printf(LogTIMER, "mp: fdset(r) %d\n", s->fd);
return 1;
}
return 0;

5
usr.sbin/ppp/physical.c
View File

@ -16,7 +16,7 @@
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* $Id: physical.c,v 1.1.2.29 1998/05/01 19:22:21 brian Exp $
* $Id: physical.c,v 1.1.2.30 1998/05/01 19:25:35 brian Exp $
*
*/
@ -130,14 +130,17 @@ physical_UpdateSet(struct descriptor *d, fd_set *r, fd_set *w, fd_set *e,
if (p->fd >= 0) {
if (r) {
FD_SET(p->fd, r);
log_Printf(LogTIMER, "%s: fdset(r) %d\n", p->link.name, p->fd);
sets++;
}
if (e) {
FD_SET(p->fd, e);
log_Printf(LogTIMER, "%s: fdset(e) %d\n", p->link.name, p->fd);
sets++;
}
if (w && (force || link_QueueLen(&p->link))) {
FD_SET(p->fd, w);
log_Printf(LogTIMER, "%s: fdset(w) %d\n", p->link.name, p->fd);
sets++;
}
if (sets && *n < p->fd + 1)

4
usr.sbin/ppp/prompt.c
View File

@ -23,7 +23,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: prompt.c,v 1.1.2.28 1998/04/19 15:24:49 brian Exp $
* $Id: prompt.c,v 1.1.2.29 1998/05/01 19:25:41 brian Exp $
*/
#include <sys/param.h>
@ -126,10 +126,12 @@ prompt_UpdateSet(struct descriptor *d, fd_set *r, fd_set *w, fd_set *e, int *n)
if (p->fd_in >= 0) {
if (r) {
FD_SET(p->fd_in, r);
log_Printf(LogTIMER, "prompt %s: fdset(r) %d\n", p->src.from, p->fd_in);
sets++;
}
if (e) {
FD_SET(p->fd_in, e);
log_Printf(LogTIMER, "prompt %s: fdset(e) %d\n", p->src.from, p->fd_in);
sets++;
}
if (sets && *n < p->fd_in + 1)

3
usr.sbin/ppp/server.c
View File

@ -23,7 +23,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: server.c,v 1.16.2.17 1998/04/28 01:25:41 brian Exp $
* $Id: server.c,v 1.16.2.18 1998/05/01 19:25:50 brian Exp $
*/
#include <sys/types.h>
@ -72,6 +72,7 @@ server_UpdateSet(struct descriptor *d, fd_set *r, fd_set *w, fd_set *e, int *n)
if (*n < s->fd + 1)
*n = s->fd + 1;
FD_SET(s->fd, r);
log_Printf(LogTIMER, "server: fdset(r) %d\n", s->fd);
return 1;
}
return 0;