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Issue #222: LOGIN service (can't reopen tty)

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* Workaround for random "Session closed" issues related to /bin/login
  closing and reopening our pty during initialization. This happens only
  on some systems like Fedora for example. Now we allow that our pty is
  closed by ignoring POLLHUP on first read. Delay is also needed so that
  login process has some time to reopen pty.
* Note that the issue may occur anyway but with this workaround we reduce
  the chances.
This commit is contained in:
KLuka 2015-12-28 15:24:49 +01:00
parent d8ef7dad3c
commit 4911d0d39c
3 changed files with 32 additions and 2 deletions
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2
shellinabox/session.c
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@ -116,9 +116,11 @@ void initSession(struct Session *session, const char *sessionKey,
session->http = NULL;
session->done = 0;
session->pty = -1;
session->ptyFirstRead = 1;
session->width = 0;
session->height = 0;
session->buffered = NULL;
session->useLogin = 0;
session->len = 0;
session->pid = 0;
session->cleanup = 0;

2
shellinabox/session.h
View file

@ -58,9 +58,11 @@ struct Session {
HttpConnection *http;
int done;
int pty;
int ptyFirstRead;
int width;
int height;
char *buffered;
int useLogin;
int len;
pid_t pid;
int cleanup;

30
shellinabox/shellinaboxd.c
View file

@ -63,7 +63,7 @@
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <time.h>
#include <unistd.h>
#ifdef HAVE_SYS_PRCTL_H
@ -291,6 +291,13 @@ static void sessionDone(void *arg) {
completePendingRequest(session, "", 0, INT_MAX);
}
static void delaySession(void) {
struct timespec ts;
ts.tv_sec = 0;
ts.tv_nsec = 200 * 1000; // Delay for 0.2 ms
nanosleep(&ts, NULL);
}
static int handleSession(struct ServerConnection *connection, void *arg,
short *events, short revents) {
struct Session *session = (struct Session *)arg;
@ -310,7 +317,7 @@ static int handleSession(struct ServerConnection *connection, void *arg,
int timedOut = serverGetTimeout(connection) < 0;
if (bytes || timedOut) {
if (!session->http && timedOut) {
debug("[server] Timeout. Closing session!");
debug("[server] Timeout. Closing session %s!", session->sessionKey);
session->cleanup = 1;
return 0;
}
@ -324,8 +331,26 @@ static int handleSession(struct ServerConnection *connection, void *arg,
*events = 0;
}
serverSetTimeout(connection, AJAX_TIMEOUT);
session->ptyFirstRead = 0;
return 1;
} else {
if (revents & POLLHUP) {
if (session->useLogin && session->ptyFirstRead) {
// Workaround for random "Session closed" issues related to /bin/login
// closing and reopening our pty during initialization. This happens only
// on some systems like Fedora for example.
// Here we allow that our pty is closed by ignoring POLLHUP on first read.
// Delay is also needed so that login process has some time to reopen pty.
// Note that the issue may occur anyway but with workaround we reduce the
// chances.
debug("[server] POLLHUP received on login PTY first read!");
session->ptyFirstRead = 0;
delaySession();
return 1;
}
debug("[server] POLLHUP received on PTY! Closing session %s!",
session->sessionKey);
}
return 0;
}
}
@ -402,6 +427,7 @@ static int dataHandler(HttpConnection *http, struct Service *service,
goto bad_new_session;
}
session->http = http;
session->useLogin = service->useLogin;
if (launchChild(service->id, session,
rootURL && *rootURL ? rootURL : urlGetURL(url)) < 0) {
abandonSession(session);