зеркало из https://github.com/Azure/sonic-openssh.git
- (djm) OpenBSD CVS Sync:
- markus@cvs.openbsd.org 2001/01/29 09:55:37 [channels.c channels.h clientloop.c serverloop.c] fix select overflow; ok deraadt@ and stevesk@
This commit is contained in:
Damien Miller
Родитель
b71eb58ff4
Коммит
5e953217f1
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@ -1,3 +1,9 @@
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20000130
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- (djm) OpenBSD CVS Sync:
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- markus@cvs.openbsd.org 2001/01/29 09:55:37
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[channels.c channels.h clientloop.c serverloop.c]
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fix select overflow; ok deraadt@ and stevesk@
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20000129
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- (stevesk) sftp-server.c: use %lld vs. %qd
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46
channels.c
46
channels.c
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@ -40,7 +40,7 @@
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*/
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#include "includes.h"
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RCSID("$OpenBSD: channels.c,v 1.83 2001/01/24 21:03:50 stevesk Exp $");
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RCSID("$OpenBSD: channels.c,v 1.84 2001/01/29 16:55:36 markus Exp $");
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#include <openssl/rsa.h>
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#include <openssl/dsa.h>
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@ -84,7 +84,7 @@ static int channels_alloc = 0;
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* Maximum file descriptor value used in any of the channels. This is
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* updated in channel_allocate.
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*/
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static int channel_max_fd_value = 0;
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static int channel_max_fd = 0;
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/* Name and directory of socket for authentication agent forwarding. */
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static char *channel_forwarded_auth_socket_name = NULL;
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@ -181,12 +181,10 @@ channel_register_fds(Channel *c, int rfd, int wfd, int efd,
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int extusage, int nonblock)
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{
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/* Update the maximum file descriptor value. */
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if (rfd > channel_max_fd_value)
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channel_max_fd_value = rfd;
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if (wfd > channel_max_fd_value)
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channel_max_fd_value = wfd;
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if (efd > channel_max_fd_value)
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channel_max_fd_value = efd;
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channel_max_fd = MAX(channel_max_fd, rfd);
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channel_max_fd = MAX(channel_max_fd, wfd);
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channel_max_fd = MAX(channel_max_fd, efd);
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/* XXX set close-on-exec -markus */
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c->rfd = rfd;
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@ -965,9 +963,27 @@ channel_handler(chan_fn *ftab[], fd_set * readset, fd_set * writeset)
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}
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void
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channel_prepare_select(fd_set * readset, fd_set * writeset)
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channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp)
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{
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channel_handler(channel_pre, readset, writeset);
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int n;
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u_int sz;
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n = MAX(*maxfdp, channel_max_fd);
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sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
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if (*readsetp == NULL || n > *maxfdp) {
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if (*readsetp)
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xfree(*readsetp);
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if (*writesetp)
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xfree(*writesetp);
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*readsetp = xmalloc(sz);
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*writesetp = xmalloc(sz);
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*maxfdp = n;
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}
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memset(*readsetp, 0, sz);
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memset(*writesetp, 0, sz);
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channel_handler(channel_pre, *readsetp, *writesetp);
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}
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void
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@ -976,7 +992,7 @@ channel_after_select(fd_set * readset, fd_set * writeset)
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channel_handler(channel_post, readset, writeset);
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}
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/* If there is data to send to the connection, send some of it now. */
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/* If there is data to send to the connection, enqueue some of it now. */
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void
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channel_output_poll()
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@ -1417,14 +1433,6 @@ channel_close_all()
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channel_close_fds(&channels[i]);
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}
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/* Returns the maximum file descriptor number used by the channels. */
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int
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channel_max_fd()
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{
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return channel_max_fd_value;
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}
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/* Returns true if any channel is still open. */
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int
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13
channels.h
13
channels.h
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@ -32,7 +32,7 @@
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/* RCSID("$OpenBSD: channels.h,v 1.24 2000/12/05 20:34:10 markus Exp $"); */
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/* RCSID("$OpenBSD: channels.h,v 1.25 2001/01/29 16:55:36 markus Exp $"); */
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#ifndef CHANNELS_H
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#define CHANNELS_H
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@ -163,8 +163,12 @@ int channel_allocate(int type, int sock, char *remote_name);
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/* Free the channel and close its socket. */
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void channel_free(int channel);
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/* Add any bits relevant to channels in select bitmasks. */
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void channel_prepare_select(fd_set * readset, fd_set * writeset);
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/*
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* Allocate/update select bitmasks and add any bits relevant to channels in
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* select bitmasks.
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*/
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void
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channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp);
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/*
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* After select, perform any appropriate operations for channels which have
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@ -188,9 +192,6 @@ void channel_stop_listening(void);
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*/
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void channel_close_all(void);
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/* Returns the maximum file descriptor number used by the channels. */
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int channel_max_fd(void);
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/* Returns true if there is still an open channel over the connection. */
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int channel_still_open(void);
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67
clientloop.c
67
clientloop.c
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@ -59,7 +59,7 @@
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*/
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#include "includes.h"
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RCSID("$OpenBSD: clientloop.c,v 1.45 2001/01/21 19:05:47 markus Exp $");
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RCSID("$OpenBSD: clientloop.c,v 1.46 2001/01/29 16:55:36 markus Exp $");
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#include "ssh.h"
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#include "ssh1.h"
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@ -124,7 +124,6 @@ static Buffer stdout_buffer; /* Buffer for stdout data. */
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static Buffer stderr_buffer; /* Buffer for stderr data. */
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static u_long stdin_bytes, stdout_bytes, stderr_bytes;
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static u_int buffer_high;/* Soft max buffer size. */
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static int max_fd; /* Maximum file descriptor number in select(). */
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static int connection_in; /* Connection to server (input). */
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static int connection_out; /* Connection to server (output). */
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@ -365,45 +364,37 @@ client_check_window_change()
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*/
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void
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client_wait_until_can_do_something(fd_set * readset, fd_set * writeset)
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client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
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int *maxfdp)
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{
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/* Initialize select masks. */
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FD_ZERO(readset);
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FD_ZERO(writeset);
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/* Add any selections by the channel mechanism. */
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channel_prepare_select(readsetp, writesetp, maxfdp);
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if (!compat20) {
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/* Read from the connection, unless our buffers are full. */
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if (buffer_len(&stdout_buffer) < buffer_high &&
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buffer_len(&stderr_buffer) < buffer_high &&
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channel_not_very_much_buffered_data())
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FD_SET(connection_in, readset);
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FD_SET(connection_in, *readsetp);
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/*
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* Read from stdin, unless we have seen EOF or have very much
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* buffered data to send to the server.
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*/
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if (!stdin_eof && packet_not_very_much_data_to_write())
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FD_SET(fileno(stdin), readset);
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FD_SET(fileno(stdin), *readsetp);
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/* Select stdout/stderr if have data in buffer. */
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if (buffer_len(&stdout_buffer) > 0)
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FD_SET(fileno(stdout), writeset);
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FD_SET(fileno(stdout), *writesetp);
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if (buffer_len(&stderr_buffer) > 0)
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FD_SET(fileno(stderr), writeset);
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FD_SET(fileno(stderr), *writesetp);
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} else {
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FD_SET(connection_in, readset);
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FD_SET(connection_in, *readsetp);
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}
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/* Add any selections by the channel mechanism. */
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channel_prepare_select(readset, writeset);
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/* Select server connection if have data to write to the server. */
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if (packet_have_data_to_write())
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FD_SET(connection_out, writeset);
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/* move UP XXX */
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/* Update maximum file descriptor number, if appropriate. */
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if (channel_max_fd() > max_fd)
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max_fd = channel_max_fd();
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FD_SET(connection_out, *writesetp);
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/*
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* Wait for something to happen. This will suspend the process until
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@ -414,11 +405,8 @@ client_wait_until_can_do_something(fd_set * readset, fd_set * writeset)
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* SSH_MSG_IGNORE packet when the timeout expires.
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*/
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if (select(max_fd + 1, readset, writeset, NULL, NULL) < 0) {
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if (select((*maxfdp)+1, *readsetp, *writesetp, NULL, NULL) < 0) {
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char buf[100];
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/* Some systems fail to clear these automatically. */
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FD_ZERO(readset);
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FD_ZERO(writeset);
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if (errno == EINTR)
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return;
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/* Note: we might still have data in the buffers. */
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@ -797,6 +785,8 @@ simple_escape_filter(Channel *c, char *buf, int len)
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int
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client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
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{
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fd_set *readset = NULL, *writeset = NULL;
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int max_fd = 0;
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double start_time, total_time;
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int len;
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char buf[100];
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@ -813,9 +803,13 @@ client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
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buffer_high = 64 * 1024;
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connection_in = packet_get_connection_in();
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connection_out = packet_get_connection_out();
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max_fd = connection_in;
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if (connection_out > max_fd)
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max_fd = connection_out;
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max_fd = MAX(connection_in, connection_out);
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if (!compat20) {
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max_fd = MAX(max_fd, fileno(stdin));
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max_fd = MAX(max_fd, fileno(stdout));
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max_fd = MAX(max_fd, fileno(stderr));
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}
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stdin_bytes = 0;
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stdout_bytes = 0;
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stderr_bytes = 0;
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@ -849,7 +843,6 @@ client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
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/* Main loop of the client for the interactive session mode. */
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while (!quit_pending) {
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fd_set readset, writeset;
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/* Process buffered packets sent by the server. */
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client_process_buffered_input_packets();
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@ -867,7 +860,7 @@ client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
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client_make_packets_from_stdin_data();
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/*
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* Make packets from buffered channel data, and buffer them
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* Make packets from buffered channel data, and enqueue them
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* for sending to the server.
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*/
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if (packet_not_very_much_data_to_write())
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@ -886,34 +879,38 @@ client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
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* Wait until we have something to do (something becomes
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* available on one of the descriptors).
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*/
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client_wait_until_can_do_something(&readset, &writeset);
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client_wait_until_can_do_something(&readset, &writeset, &max_fd);
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if (quit_pending)
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break;
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/* Do channel operations. */
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channel_after_select(&readset, &writeset);
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channel_after_select(readset, writeset);
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/* Buffer input from the connection. */
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client_process_net_input(&readset);
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client_process_net_input(readset);
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if (quit_pending)
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break;
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if (!compat20) {
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/* Buffer data from stdin */
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client_process_input(&readset);
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client_process_input(readset);
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/*
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* Process output to stdout and stderr. Output to
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* the connection is processed elsewhere (above).
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*/
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client_process_output(&writeset);
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client_process_output(writeset);
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}
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/* Send as much buffered packet data as possible to the sender. */
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if (FD_ISSET(connection_out, &writeset))
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if (FD_ISSET(connection_out, writeset))
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packet_write_poll();
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}
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if (readset)
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xfree(readset);
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if (writeset)
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xfree(writeset);
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/* Terminate the session. */
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85
serverloop.c
85
serverloop.c
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@ -35,7 +35,7 @@
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*/
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#include "includes.h"
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RCSID("$OpenBSD: serverloop.c,v 1.42 2001/01/21 19:05:55 markus Exp $");
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RCSID("$OpenBSD: serverloop.c,v 1.43 2001/01/29 16:55:37 markus Exp $");
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#include "xmalloc.h"
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#include "packet.h"
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@ -73,7 +73,6 @@ static int fderr_eof = 0; /* EOF encountered readung from fderr. */
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static int connection_in; /* Connection to client (input). */
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static int connection_out; /* Connection to client (output). */
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static u_int buffer_high;/* "Soft" max buffer size. */
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static int max_fd; /* Max file descriptor number for select(). */
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/*
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* This SIGCHLD kludge is used to detect when the child exits. The server
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@ -180,8 +179,8 @@ make_packets_from_stdout_data()
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* for the duration of the wait (0 = infinite).
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*/
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void
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wait_until_can_do_something(fd_set * readset, fd_set * writeset,
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u_int max_time_milliseconds)
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wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, int *maxfdp,
|
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u_int max_time_milliseconds)
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{
|
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struct timeval tv, *tvp;
|
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int ret;
|
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|
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@ -189,14 +188,13 @@ wait_until_can_do_something(fd_set * readset, fd_set * writeset,
|
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/* When select fails we restart from here. */
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retry_select:
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/* Initialize select() masks. */
|
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FD_ZERO(readset);
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FD_ZERO(writeset);
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/* Allocate and update select() masks for channel descriptors. */
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channel_prepare_select(readsetp, writesetp, maxfdp);
|
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|
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if (compat20) {
|
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/* wrong: bad condition XXX */
|
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if (channel_not_very_much_buffered_data())
|
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FD_SET(connection_in, readset);
|
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FD_SET(connection_in, *readsetp);
|
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} else {
|
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/*
|
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* Read packets from the client unless we have too much
|
||||
|
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@ -204,37 +202,31 @@ retry_select:
|
|||
*/
|
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if (buffer_len(&stdin_buffer) < buffer_high &&
|
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channel_not_very_much_buffered_data())
|
||||
FD_SET(connection_in, readset);
|
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FD_SET(connection_in, *readsetp);
|
||||
/*
|
||||
* If there is not too much data already buffered going to
|
||||
* the client, try to get some more data from the program.
|
||||
*/
|
||||
if (packet_not_very_much_data_to_write()) {
|
||||
if (!fdout_eof)
|
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FD_SET(fdout, readset);
|
||||
FD_SET(fdout, *readsetp);
|
||||
if (!fderr_eof)
|
||||
FD_SET(fderr, readset);
|
||||
FD_SET(fderr, *readsetp);
|
||||
}
|
||||
/*
|
||||
* If we have buffered data, try to write some of that data
|
||||
* to the program.
|
||||
*/
|
||||
if (fdin != -1 && buffer_len(&stdin_buffer) > 0)
|
||||
FD_SET(fdin, writeset);
|
||||
FD_SET(fdin, *writesetp);
|
||||
}
|
||||
/* Set masks for channel descriptors. */
|
||||
channel_prepare_select(readset, writeset);
|
||||
|
||||
/*
|
||||
* If we have buffered packet data going to the client, mark that
|
||||
* descriptor.
|
||||
*/
|
||||
if (packet_have_data_to_write())
|
||||
FD_SET(connection_out, writeset);
|
||||
|
||||
/* Update the maximum descriptor number if appropriate. */
|
||||
if (channel_max_fd() > max_fd)
|
||||
max_fd = channel_max_fd();
|
||||
FD_SET(connection_out, *writesetp);
|
||||
|
||||
/*
|
||||
* If child has terminated and there is enough buffer space to read
|
||||
|
|
@ -255,7 +247,7 @@ retry_select:
|
|||
debug2("tvp!=NULL kid %d mili %d", child_terminated, max_time_milliseconds);
|
||||
|
||||
/* Wait for something to happen, or the timeout to expire. */
|
||||
ret = select(max_fd + 1, readset, writeset, NULL, tvp);
|
||||
ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
|
||||
|
||||
if (ret < 0) {
|
||||
if (errno != EINTR)
|
||||
|
|
@ -400,7 +392,8 @@ process_buffered_input_packets()
|
|||
void
|
||||
server_loop(pid_t pid, int fdin_arg, int fdout_arg, int fderr_arg)
|
||||
{
|
||||
fd_set readset, writeset;
|
||||
fd_set *readset = NULL, *writeset = NULL;
|
||||
int max_fd;
|
||||
int wait_status; /* Status returned by wait(). */
|
||||
pid_t wait_pid; /* pid returned by wait(). */
|
||||
int waiting_termination = 0; /* Have displayed waiting close message. */
|
||||
|
|
@ -441,15 +434,11 @@ server_loop(pid_t pid, int fdin_arg, int fdout_arg, int fderr_arg)
|
|||
buffer_high = 64 * 1024;
|
||||
|
||||
/* Initialize max_fd to the maximum of the known file descriptors. */
|
||||
max_fd = fdin;
|
||||
if (fdout > max_fd)
|
||||
max_fd = fdout;
|
||||
if (fderr != -1 && fderr > max_fd)
|
||||
max_fd = fderr;
|
||||
if (connection_in > max_fd)
|
||||
max_fd = connection_in;
|
||||
if (connection_out > max_fd)
|
||||
max_fd = connection_out;
|
||||
max_fd = MAX(fdin, fdout);
|
||||
if (fderr != -1)
|
||||
max_fd = MAX(max_fd, fderr);
|
||||
max_fd = MAX(max_fd, connection_in);
|
||||
max_fd = MAX(max_fd, connection_out);
|
||||
|
||||
/* Initialize Initialize buffers. */
|
||||
buffer_init(&stdin_buffer);
|
||||
|
|
@ -536,18 +525,22 @@ server_loop(pid_t pid, int fdin_arg, int fdout_arg, int fderr_arg)
|
|||
}
|
||||
}
|
||||
/* Sleep in select() until we can do something. */
|
||||
wait_until_can_do_something(&readset, &writeset,
|
||||
max_time_milliseconds);
|
||||
wait_until_can_do_something(&readset, &writeset, &max_fd,
|
||||
max_time_milliseconds);
|
||||
|
||||
/* Process any channel events. */
|
||||
channel_after_select(&readset, &writeset);
|
||||
channel_after_select(readset, writeset);
|
||||
|
||||
/* Process input from the client and from program stdout/stderr. */
|
||||
process_input(&readset);
|
||||
process_input(readset);
|
||||
|
||||
/* Process output to the client and to program stdin. */
|
||||
process_output(&writeset);
|
||||
process_output(writeset);
|
||||
}
|
||||
if (readset)
|
||||
xfree(readset);
|
||||
if (writeset)
|
||||
xfree(writeset);
|
||||
|
||||
/* Cleanup and termination code. */
|
||||
|
||||
|
|
@ -638,7 +631,8 @@ server_loop(pid_t pid, int fdin_arg, int fdout_arg, int fderr_arg)
|
|||
void
|
||||
server_loop2(void)
|
||||
{
|
||||
fd_set readset, writeset;
|
||||
fd_set *readset = NULL, *writeset = NULL;
|
||||
int max_fd;
|
||||
int had_channel = 0;
|
||||
int status;
|
||||
pid_t pid;
|
||||
|
|
@ -650,9 +644,9 @@ server_loop2(void)
|
|||
child_terminated = 0;
|
||||
connection_in = packet_get_connection_in();
|
||||
connection_out = packet_get_connection_out();
|
||||
max_fd = connection_in;
|
||||
if (connection_out > max_fd)
|
||||
max_fd = connection_out;
|
||||
|
||||
max_fd = MAX(connection_in, connection_out);
|
||||
|
||||
server_init_dispatch();
|
||||
|
||||
for (;;) {
|
||||
|
|
@ -665,16 +659,21 @@ server_loop2(void)
|
|||
}
|
||||
if (packet_not_very_much_data_to_write())
|
||||
channel_output_poll();
|
||||
wait_until_can_do_something(&readset, &writeset, 0);
|
||||
wait_until_can_do_something(&readset, &writeset, &max_fd, 0);
|
||||
if (child_terminated) {
|
||||
while ((pid = waitpid(-1, &status, WNOHANG)) > 0)
|
||||
session_close_by_pid(pid, status);
|
||||
child_terminated = 0;
|
||||
}
|
||||
channel_after_select(&readset, &writeset);
|
||||
process_input(&readset);
|
||||
process_output(&writeset);
|
||||
channel_after_select(readset, writeset);
|
||||
process_input(readset);
|
||||
process_output(writeset);
|
||||
}
|
||||
if (readset)
|
||||
xfree(readset);
|
||||
if (writeset)
|
||||
xfree(writeset);
|
||||
|
||||
signal(SIGCHLD, SIG_DFL);
|
||||
while ((pid = waitpid(-1, &status, WNOHANG)) > 0)
|
||||
session_close_by_pid(pid, status);
|
||||
|
|
|
|||
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