* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
* All rights reserved
- * Created: Sun Sep 10 00:30:37 1995 ylo
* Server main loop for handling the interactive session.
- */
-/*
+ *
+ * As far as I am concerned, the code I have written for this software
+ * can be used freely for any purpose. Any derived versions of this
+ * software must be clearly marked as such, and if the derived work is
+ * incompatible with the protocol description in the RFC file, it must be
+ * called by a name other than "ssh" or "Secure Shell".
+ *
* SSH2 support by Markus Friedl.
* Copyright (c) 2000 Markus Friedl. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "includes.h"
+RCSID("$OpenBSD: serverloop.c,v 1.34 2000/10/27 07:32:18 markus Exp $");
+
#include "xmalloc.h"
#include "ssh.h"
#include "packet.h"
#include "ssh2.h"
#include "session.h"
#include "dispatch.h"
+#include "auth-options.h"
+
+extern ServerOptions options;
static Buffer stdin_buffer; /* Buffer for stdin data. */
static Buffer stdout_buffer; /* Buffer for stdout data. */
error("Strange, got SIGCHLD and wait returned pid %d but child is %d",
wait_pid, child_pid);
if (WIFEXITED(child_wait_status) ||
- WIFSIGNALED(child_wait_status))
+ WIFSIGNALED(child_wait_status)) {
child_terminated = 1;
child_has_selected = 0;
+ }
}
signal(SIGCHLD, sigchld_handler);
errno = save_errno;
int save_errno = errno;
debug("Received SIGCHLD.");
child_terminated = 1;
- signal(SIGCHLD, sigchld_handler2);
+ child_has_selected = 0;
errno = save_errno;
}
/* Initialize select() masks. */
FD_ZERO(readset);
+ FD_ZERO(writeset);
- /*
- * Read packets from the client unless we have too much buffered
- * stdin or channel data.
- */
if (compat20) {
- // wrong: bad conditionXXX
+ /* wrong: bad condition XXX */
if (channel_not_very_much_buffered_data())
FD_SET(connection_in, readset);
} else {
- if (buffer_len(&stdin_buffer) < 4096 &&
+ /*
+ * Read packets from the client unless we have too much
+ * buffered stdin or channel data.
+ */
+ if (buffer_len(&stdin_buffer) < buffer_high &&
channel_not_very_much_buffered_data())
FD_SET(connection_in, readset);
+ /*
+ * 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)
+ FD_SET(fdout, readset);
+ if (!fderr_eof)
+ FD_SET(fderr, readset);
+ }
+ /*
+ * 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);
}
-
- /*
- * If there is not too much data already buffered going to the
- * client, try to get some more data from the program.
- */
- if (!compat20 && packet_not_very_much_data_to_write()) {
- if (!fdout_eof)
- FD_SET(fdout, readset);
- if (!fderr_eof)
- FD_SET(fderr, readset);
- }
- FD_ZERO(writeset);
-
/* Set masks for channel descriptors. */
channel_prepare_select(readset, writeset);
if (packet_have_data_to_write())
FD_SET(connection_out, writeset);
- /* If we have buffered data, try to write some of that data to the
- program. */
- if (!compat20 && fdin != -1 && buffer_len(&stdin_buffer) > 0)
- FD_SET(fdin, writeset);
-
/* Update the maximum descriptor number if appropriate. */
if (channel_max_fd() > max_fd)
max_fd = channel_max_fd();
if (len == 0) {
verbose("Connection closed by remote host.");
fatal_cleanup();
+ } else if (len < 0) {
+ if (errno != EINTR && errno != EAGAIN) {
+ verbose("Read error from remote host: %.100s", strerror(errno));
+ fatal_cleanup();
+ }
+ } else {
+ /* Buffer any received data. */
+ packet_process_incoming(buf, len);
}
- /*
- * There is a kernel bug on Solaris that causes select to
- * sometimes wake up even though there is no data available.
- */
- if (len < 0 && errno == EAGAIN)
- len = 0;
-
- if (len < 0) {
- verbose("Read error from remote host: %.100s", strerror(errno));
- fatal_cleanup();
- }
- /* Buffer any received data. */
- packet_process_incoming(buf, len);
}
if (compat20)
return;
/* Read and buffer any available stdout data from the program. */
if (!fdout_eof && FD_ISSET(fdout, readset)) {
len = read(fdout, buf, sizeof(buf));
- if (len <= 0)
+ if (len < 0 && (errno == EINTR || errno == EAGAIN)) {
+ /* do nothing */
+ } else if (len <= 0) {
fdout_eof = 1;
- else {
+ } else {
buffer_append(&stdout_buffer, buf, len);
fdout_bytes += len;
}
/* Read and buffer any available stderr data from the program. */
if (!fderr_eof && FD_ISSET(fderr, readset)) {
len = read(fderr, buf, sizeof(buf));
- if (len <= 0)
+ if (len < 0 && (errno == EINTR || errno == EAGAIN)) {
+ /* do nothing */
+ } else if (len <= 0) {
fderr_eof = 1;
- else
+ } else {
buffer_append(&stderr_buffer, buf, len);
+ }
}
}
if (!compat20 && fdin != -1 && FD_ISSET(fdin, writeset)) {
len = write(fdin, buffer_ptr(&stdin_buffer),
buffer_len(&stdin_buffer));
- if (len <= 0) {
+ if (len < 0 && (errno == EINTR || errno == EAGAIN)) {
+ /* do nothing */
+ } else if (len <= 0) {
#ifdef USE_PIPES
close(fdin);
#else
void
process_buffered_input_packets()
{
- dispatch_run(DISPATCH_NONBLOCK, NULL);
+ dispatch_run(DISPATCH_NONBLOCK, NULL, NULL);
}
/*
void
server_loop(pid_t pid, int fdin_arg, int fdout_arg, int fderr_arg)
{
+ fd_set readset, writeset;
int wait_status; /* Status returned by wait(). */
pid_t wait_pid; /* pid returned by wait(). */
int waiting_termination = 0; /* Have displayed waiting close message. */
child_terminated = 0;
child_has_selected = 0;
signal(SIGCHLD, sigchld_handler);
+ signal(SIGPIPE, SIG_IGN);
/* Initialize our global variables. */
fdin = fdin_arg;
fdout = fdout_arg;
fderr = fderr_arg;
+
+ /* nonblocking IO */
+ set_nonblock(fdin);
+ set_nonblock(fdout);
+ /* we don't have stderr for interactive terminal sessions, see below */
+ if (fderr != -1)
+ set_nonblock(fderr);
+
connection_in = packet_get_connection_in();
connection_out = packet_get_connection_out();
/* Main loop of the server for the interactive session mode. */
for (;;) {
- fd_set readset, writeset;
/* Process buffered packets from the client. */
process_buffered_input_packets();
debug("Entering interactive session for SSH2.");
signal(SIGCHLD, sigchld_handler2);
+ signal(SIGPIPE, SIG_IGN);
child_terminated = 0;
connection_in = packet_get_connection_in();
connection_out = packet_get_connection_out();
if (packet_not_very_much_data_to_write())
channel_output_poll();
wait_until_can_do_something(&readset, &writeset, 0);
- if (child_terminated) {
+ if (child_terminated && child_has_selected) {
+ /* XXX: race - assumes only one child has terminated */
while ((pid = waitpid(-1, &status, WNOHANG)) > 0)
session_close_by_pid(pid, status);
child_terminated = 0;
+ child_has_selected = 0;
+ signal(SIGCHLD, sigchld_handler2);
}
channel_after_select(&readset, &writeset);
process_input(&readset);
}
void
-server_input_stdin_data(int type, int plen)
+server_input_stdin_data(int type, int plen, void *ctxt)
{
char *data;
unsigned int data_len;
}
void
-server_input_eof(int type, int plen)
+server_input_eof(int type, int plen, void *ctxt)
{
/*
* Eof from the client. The stdin descriptor to the
}
void
-server_input_window_size(int type, int plen)
+server_input_window_size(int type, int plen, void *ctxt)
{
int row = packet_get_int();
int col = packet_get_int();
originator = packet_get_string(NULL);
originator_port = packet_get_int();
packet_done();
+
+ debug("open direct-tcpip: from %s port %d to %s port %d",
+ originator, originator_port, target, target_port);
+
/* XXX check permission */
+ if (no_port_forwarding_flag || !options.allow_tcp_forwarding) {
+ xfree(target);
+ xfree(originator);
+ return -1;
+ }
sock = channel_connect_to(target, target_port);
xfree(target);
xfree(originator);
if (sock < 0)
return -1;
return channel_new("direct-tcpip", SSH_CHANNEL_OPEN,
- sock, sock, -1, 4*1024, 32*1024, 0, xstrdup("direct-tcpip"));
+ sock, sock, -1, CHAN_TCP_WINDOW_DEFAULT,
+ CHAN_TCP_PACKET_DEFAULT, 0, xstrdup("direct-tcpip"), 1);
}
void
-server_input_channel_open(int type, int plen)
+server_input_channel_open(int type, int plen, void *ctxt)
{
Channel *c = NULL;
char *ctype;
rwindow = packet_get_int();
rmaxpack = packet_get_int();
- debug("channel_input_open: ctype %s rchan %d win %d max %d",
+ debug("server_input_channel_open: ctype %s rchan %d win %d max %d",
ctype, rchan, rwindow, rmaxpack);
if (strcmp(ctype, "session") == 0) {
* CHANNEL_REQUEST messages is registered.
*/
id = channel_new(ctype, SSH_CHANNEL_LARVAL,
- -1, -1, -1, 0, 32*1024, 0, xstrdup("server-session"));
+ -1, -1, -1, 0, CHAN_SES_PACKET_DEFAULT,
+ 0, xstrdup("server-session"), 1);
if (session_open(id) == 1) {
channel_register_callback(id, SSH2_MSG_CHANNEL_REQUEST,
session_input_channel_req, (void *)0);
channel_free(id);
}
} else if (strcmp(ctype, "direct-tcpip") == 0) {
- debug("open direct-tcpip");
id = input_direct_tcpip();
if (id >= 0)
c = channel_lookup(id);
andersk / openssh.git / blobdiff