]> andersk Git - openssh.git/blobdiff - serverloop.c
- (djm) Merge OpenBSD changes:
[openssh.git] / serverloop.c
index 94c2115710dcecb1cc03721aea1c6034c878fd10..c2b2d0222e0a68585b916fba808eeb24123e6203 100644 (file)
@@ -2,8 +2,36 @@
  * 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"
 #include "buffer.h"
 #include "servconf.h"
 #include "pty.h"
+#include "channels.h"
+
+#include "compat.h"
+#include "ssh2.h"
+#include "session.h"
+#include "dispatch.h"
+#include "auth-options.h"
 
 static Buffer stdin_buffer;    /* Buffer for stdin data. */
 static Buffer stdout_buffer;   /* Buffer for stdout data. */
@@ -36,17 +71,25 @@ static int max_fd;          /* Max file descriptor number for select(). */
 /*
  * This SIGCHLD kludge is used to detect when the child exits.  The server
  * will exit after that, as soon as forwarded connections have terminated.
+ *
+ * After SIGCHLD child_has_selected is set to 1 after the first pass
+ * through the wait_until_can_do_something() select(). This ensures
+ * that the child's output gets a chance to drain before it is yanked.
  */
 
-static int child_pid;                  /* Pid of the child. */
+static pid_t child_pid;                        /* Pid of the child. */
 static volatile int child_terminated;  /* The child has terminated. */
+static volatile int child_has_selected; /* Child has had chance to drain. */
 static volatile int child_wait_status; /* Status from wait(). */
 
-void 
+void   server_init_dispatch(void);
+
+void
 sigchld_handler(int sig)
 {
        int save_errno = errno;
-       int wait_pid;
+       pid_t wait_pid;
+
        debug("Received SIGCHLD.");
        wait_pid = wait((int *) &child_wait_status);
        if (wait_pid != -1) {
@@ -56,121 +99,33 @@ sigchld_handler(int sig)
                if (WIFEXITED(child_wait_status) ||
                    WIFSIGNALED(child_wait_status))
                        child_terminated = 1;
+                       child_has_selected = 0;
        }
        signal(SIGCHLD, sigchld_handler);
        errno = save_errno;
 }
-
-/*
- * Process any buffered packets that have been received from the client.
- */
-void 
-process_buffered_input_packets()
+void
+sigchld_handler2(int sig)
 {
-       int type;
-       char *data;
-       unsigned int data_len;
-       int row, col, xpixel, ypixel;
-       int payload_len;
-
-       /* Process buffered packets from the client. */
-       while ((type = packet_read_poll(&payload_len)) != SSH_MSG_NONE) {
-               switch (type) {
-               case SSH_CMSG_STDIN_DATA:
-                       /* Stdin data from the client.  Append it to the buffer. */
-                       /* Ignore any data if the client has closed stdin. */
-                       if (fdin == -1)
-                               break;
-                       data = packet_get_string(&data_len);
-                       packet_integrity_check(payload_len, (4 + data_len), type);
-                       buffer_append(&stdin_buffer, data, data_len);
-                       memset(data, 0, data_len);
-                       xfree(data);
-                       break;
-
-               case SSH_CMSG_EOF:
-                       /*
-                        * Eof from the client.  The stdin descriptor to the
-                        * program will be closed when all buffered data has
-                        * drained.
-                        */
-                       debug("EOF received for stdin.");
-                       packet_integrity_check(payload_len, 0, type);
-                       stdin_eof = 1;
-                       break;
-
-               case SSH_CMSG_WINDOW_SIZE:
-                       debug("Window change received.");
-                       packet_integrity_check(payload_len, 4 * 4, type);
-                       row = packet_get_int();
-                       col = packet_get_int();
-                       xpixel = packet_get_int();
-                       ypixel = packet_get_int();
-                       if (fdin != -1)
-                               pty_change_window_size(fdin, row, col, xpixel, ypixel);
-                       break;
-
-               case SSH_MSG_PORT_OPEN:
-                       debug("Received port open request.");
-                       channel_input_port_open(payload_len);
-                       break;
-
-               case SSH_MSG_CHANNEL_OPEN_CONFIRMATION:
-                       debug("Received channel open confirmation.");
-                       packet_integrity_check(payload_len, 4 + 4, type);
-                       channel_input_open_confirmation();
-                       break;
-
-               case SSH_MSG_CHANNEL_OPEN_FAILURE:
-                       debug("Received channel open failure.");
-                       packet_integrity_check(payload_len, 4, type);
-                       channel_input_open_failure();
-                       break;
-
-               case SSH_MSG_CHANNEL_DATA:
-                       channel_input_data(payload_len);
-                       break;
-
-               case SSH_MSG_CHANNEL_CLOSE:
-                       debug("Received channel close.");
-                       packet_integrity_check(payload_len, 4, type);
-                       channel_input_close();
-                       break;
-
-               case SSH_MSG_CHANNEL_CLOSE_CONFIRMATION:
-                       debug("Received channel close confirmation.");
-                       packet_integrity_check(payload_len, 4, type);
-                       channel_input_close_confirmation();
-                       break;
-
-               default:
-                       /*
-                        * In this phase, any unexpected messages cause a
-                        * protocol error.  This is to ease debugging; also,
-                        * since no confirmations are sent messages,
-                        * unprocessed unknown messages could cause strange
-                        * problems.  Any compatible protocol extensions must
-                        * be negotiated before entering the interactive
-                        * session.
-                        */
-                       packet_disconnect("Protocol error during session: type %d",
-                                         type);
-               }
-       }
+       int save_errno = errno;
+       debug("Received SIGCHLD.");
+       child_terminated = 1;
+       child_has_selected = 0;
+       errno = save_errno;
 }
 
 /*
  * Make packets from buffered stderr data, and buffer it for sending
  * to the client.
  */
-void 
+void
 make_packets_from_stderr_data()
 {
        int len;
 
        /* Send buffered stderr data to the client. */
        while (buffer_len(&stderr_buffer) > 0 &&
-              packet_not_very_much_data_to_write()) {
+           packet_not_very_much_data_to_write()) {
                len = buffer_len(&stderr_buffer);
                if (packet_is_interactive()) {
                        if (len > 512)
@@ -192,14 +147,14 @@ make_packets_from_stderr_data()
  * Make packets from buffered stdout data, and buffer it for sending to the
  * client.
  */
-void 
+void
 make_packets_from_stdout_data()
 {
        int len;
 
        /* Send buffered stdout data to the client. */
        while (buffer_len(&stdout_buffer) > 0 &&
-              packet_not_very_much_data_to_write()) {
+           packet_not_very_much_data_to_write()) {
                len = buffer_len(&stdout_buffer);
                if (packet_is_interactive()) {
                        if (len > 512)
@@ -223,7 +178,7 @@ make_packets_from_stdout_data()
  * have data or can accept data.  Optionally, a maximum time can be specified
  * for the duration of the wait (0 = infinite).
  */
-void 
+void
 wait_until_can_do_something(fd_set * readset, fd_set * writeset,
                            unsigned int max_time_milliseconds)
 {
@@ -235,27 +190,37 @@ retry_select:
 
        /* Initialize select() masks. */
        FD_ZERO(readset);
-
-       /*
-        * Read packets from the client unless we have too much buffered
-        * stdin or channel data.
-        */
-       if (buffer_len(&stdin_buffer) < 4096 &&
-           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);
-       }
        FD_ZERO(writeset);
 
+       if (compat20) {
+               /* wrong: bad condition XXX */
+               if (channel_not_very_much_buffered_data())
+                       FD_SET(connection_in, readset);
+       } else {
+               /*
+                * 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);
+       }
        /* Set masks for channel descriptors. */
        channel_prepare_select(readset, writeset);
 
@@ -266,11 +231,6 @@ retry_select:
        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 (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();
@@ -290,6 +250,8 @@ retry_select:
                tv.tv_usec = 1000 * (max_time_milliseconds % 1000);
                tvp = &tv;
        }
+       if (tvp!=NULL)
+               debug("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);
@@ -300,13 +262,16 @@ retry_select:
                else
                        goto retry_select;
        }
+       
+       if (child_terminated)
+               child_has_selected = 1;
 }
 
 /*
  * Processes input from the client and the program.  Input data is stored
  * in buffers and processed later.
  */
-void 
+void
 process_input(fd_set * readset)
 {
        int len;
@@ -318,27 +283,27 @@ process_input(fd_set * readset)
                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;
                }
@@ -346,30 +311,35 @@ process_input(fd_set * readset)
        /* 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);
+               }
        }
 }
 
 /*
  * Sends data from internal buffers to client program stdin.
  */
-void 
+void
 process_output(fd_set * writeset)
 {
        int len;
 
        /* Write buffered data to program stdin. */
-       if (fdin != -1 && FD_ISSET(fdin, writeset)) {
+       if (!compat20 && fdin != -1 && FD_ISSET(fdin, writeset)) {
                len = write(fdin, buffer_ptr(&stdin_buffer),
-                           buffer_len(&stdin_buffer));
-               if (len <= 0) {
+                   buffer_len(&stdin_buffer));
+               if (len < 0 && (errno == EINTR || errno == EAGAIN)) {
+                       /* do nothing */
+               } else if (len <= 0) {
 #ifdef USE_PIPES
                        close(fdin);
 #else
-                       if (fdout == -1)
+                       if (fdin != fdout)
                                close(fdin);
                        else
                                shutdown(fdin, SHUT_WR); /* We will no longer send. */
@@ -391,7 +361,7 @@ process_output(fd_set * writeset)
  * Wait until all buffered output has been sent to the client.
  * This is used when the program terminates.
  */
-void 
+void
 drain_output()
 {
        /* Send any buffered stdout data to the client. */
@@ -416,6 +386,12 @@ drain_output()
        packet_write_wait();
 }
 
+void
+process_buffered_input_packets()
+{
+       dispatch_run(DISPATCH_NONBLOCK, NULL);
+}
+
 /*
  * Performs the interactive session.  This handles data transmission between
  * the client and the program.  Note that the notion of stdin, stdout, and
@@ -423,10 +399,12 @@ drain_output()
  * stdin (of the child program), and reads from stdout and stderr (of the
  * child program).
  */
-void 
-server_loop(int pid, int fdin_arg, int fdout_arg, int fderr_arg)
+void
+server_loop(pid_t pid, int fdin_arg, int fdout_arg, int fderr_arg)
 {
-       int wait_status, wait_pid;      /* Status and pid returned by wait(). */
+       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. */
        unsigned int max_time_milliseconds;
        unsigned int previous_stdout_buffer_bytes;
@@ -438,12 +416,21 @@ server_loop(int pid, int fdin_arg, int fdout_arg, int fderr_arg)
        /* Initialize the SIGCHLD kludge. */
        child_pid = pid;
        child_terminated = 0;
+       child_has_selected = 0;
        signal(SIGCHLD, sigchld_handler);
 
        /* 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();
 
@@ -480,9 +467,10 @@ server_loop(int pid, int fdin_arg, int fdout_arg, int fderr_arg)
        if (fderr == -1)
                fderr_eof = 1;
 
+       server_init_dispatch();
+
        /* 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();
@@ -495,7 +483,7 @@ server_loop(int pid, int fdin_arg, int fdout_arg, int fderr_arg)
 #ifdef USE_PIPES
                        close(fdin);
 #else
-                       if (fdout == -1)
+                       if (fdin != fdout)
                                close(fdin);
                        else
                                shutdown(fdin, SHUT_WR); /* We will no longer send. */
@@ -533,10 +521,13 @@ server_loop(int pid, int fdin_arg, int fdout_arg, int fderr_arg)
                 * descriptors, and we have no more data to send to the
                 * client, and there is no pending buffered data.
                 */
-               if (fdout_eof && fderr_eof && !packet_have_data_to_write() &&
-                   buffer_len(&stdout_buffer) == 0 && buffer_len(&stderr_buffer) == 0) {
+               if (((fdout_eof && fderr_eof) || 
+                   (child_terminated && child_has_selected)) && 
+                   !packet_have_data_to_write() &&
+                   (buffer_len(&stdout_buffer) == 0) && 
+                        (buffer_len(&stderr_buffer) == 0)) {
                        if (!channel_still_open())
-                               goto quit;
+                               break;
                        if (!waiting_termination) {
                                const char *s = "Waiting for forwarded connections to terminate...\r\n";
                                char *cp;
@@ -563,7 +554,6 @@ server_loop(int pid, int fdin_arg, int fdout_arg, int fderr_arg)
                process_output(&writeset);
        }
 
-quit:
        /* Cleanup and termination code. */
 
        /* Wait until all output has been sent to the client. */
@@ -649,3 +639,246 @@ quit:
        packet_disconnect("wait returned status %04x.", wait_status);
        /* NOTREACHED */
 }
+
+void
+server_loop2(void)
+{
+       fd_set readset, writeset;
+       int had_channel = 0;
+       int status;
+       pid_t pid;
+
+       debug("Entering interactive session for SSH2.");
+
+       signal(SIGCHLD, sigchld_handler2);
+       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;
+       server_init_dispatch();
+
+       for (;;) {
+               process_buffered_input_packets();
+               if (!had_channel && channel_still_open())
+                       had_channel = 1;
+               if (had_channel && !channel_still_open()) {
+                       debug("!channel_still_open.");
+                       break;
+               }
+               if (packet_not_very_much_data_to_write())
+                       channel_output_poll();
+               wait_until_can_do_something(&readset, &writeset, 0);
+               if (child_terminated) {
+                       while ((pid = waitpid(-1, &status, WNOHANG)) > 0)
+                               session_close_by_pid(pid, status);
+                       child_terminated = 0;
+                       signal(SIGCHLD, sigchld_handler2);
+               }
+               channel_after_select(&readset, &writeset);
+               if (child_terminated && child_has_selected)
+                       break;
+               process_input(&readset);
+               process_output(&writeset);
+       }
+       signal(SIGCHLD, SIG_DFL);
+       while ((pid = waitpid(-1, &status, WNOHANG)) > 0)
+               session_close_by_pid(pid, status);
+       channel_stop_listening();
+}
+
+void
+server_input_stdin_data(int type, int plen)
+{
+       char *data;
+       unsigned int data_len;
+
+       /* Stdin data from the client.  Append it to the buffer. */
+       /* Ignore any data if the client has closed stdin. */
+       if (fdin == -1)
+               return;
+       data = packet_get_string(&data_len);
+       packet_integrity_check(plen, (4 + data_len), type);
+       buffer_append(&stdin_buffer, data, data_len);
+       memset(data, 0, data_len);
+       xfree(data);
+}
+
+void
+server_input_eof(int type, int plen)
+{
+       /*
+        * Eof from the client.  The stdin descriptor to the
+        * program will be closed when all buffered data has
+        * drained.
+        */
+       debug("EOF received for stdin.");
+       packet_integrity_check(plen, 0, type);
+       stdin_eof = 1;
+}
+
+void
+server_input_window_size(int type, int plen)
+{
+       int row = packet_get_int();
+       int col = packet_get_int();
+       int xpixel = packet_get_int();
+       int ypixel = packet_get_int();
+
+       debug("Window change received.");
+       packet_integrity_check(plen, 4 * 4, type);
+       if (fdin != -1)
+               pty_change_window_size(fdin, row, col, xpixel, ypixel);
+}
+
+int
+input_direct_tcpip(void)
+{
+       int sock;
+       char *target, *originator;
+       int target_port, originator_port;
+
+       target = packet_get_string(NULL);
+       target_port = 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) {
+               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, CHAN_TCP_WINDOW_DEFAULT,
+           CHAN_TCP_PACKET_DEFAULT, 0, xstrdup("direct-tcpip"));
+}
+
+void
+server_input_channel_open(int type, int plen)
+{
+       Channel *c = NULL;
+       char *ctype;
+       int id;
+       unsigned int len;
+       int rchan;
+       int rmaxpack;
+       int rwindow;
+
+       ctype = packet_get_string(&len);
+       rchan = packet_get_int();
+       rwindow = packet_get_int();
+       rmaxpack = packet_get_int();
+
+       debug("channel_input_open: ctype %s rchan %d win %d max %d",
+           ctype, rchan, rwindow, rmaxpack);
+
+       if (strcmp(ctype, "session") == 0) {
+               debug("open session");
+               packet_done();
+               /*
+                * A server session has no fd to read or write
+                * until a CHANNEL_REQUEST for a shell is made,
+                * so we set the type to SSH_CHANNEL_LARVAL.
+                * Additionally, a callback for handling all
+                * CHANNEL_REQUEST messages is registered.
+                */
+               id = channel_new(ctype, SSH_CHANNEL_LARVAL,
+                   -1, -1, -1, 0, CHAN_SES_PACKET_DEFAULT,
+                   0, xstrdup("server-session"));
+               if (session_open(id) == 1) {
+                       channel_register_callback(id, SSH2_MSG_CHANNEL_REQUEST,
+                           session_input_channel_req, (void *)0);
+                       channel_register_cleanup(id, session_close_by_channel);
+                       c = channel_lookup(id);
+               } else {
+                       debug("session open failed, free channel %d", id);
+                       channel_free(id);
+               }
+       } else if (strcmp(ctype, "direct-tcpip") == 0) {
+               id = input_direct_tcpip();
+               if (id >= 0)
+                       c = channel_lookup(id);
+       }
+       if (c != NULL) {
+               debug("confirm %s", ctype);
+               c->remote_id = rchan;
+               c->remote_window = rwindow;
+               c->remote_maxpacket = rmaxpack;
+
+               packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
+               packet_put_int(c->remote_id);
+               packet_put_int(c->self);
+               packet_put_int(c->local_window);
+               packet_put_int(c->local_maxpacket);
+               packet_send();
+       } else {
+               debug("failure %s", ctype);
+               packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
+               packet_put_int(rchan);
+               packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
+               packet_put_cstring("bla bla");
+               packet_put_cstring("");
+               packet_send();
+       }
+       xfree(ctype);
+}
+
+void
+server_init_dispatch_20()
+{
+       debug("server_init_dispatch_20");
+       dispatch_init(&dispatch_protocol_error);
+       dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
+       dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
+       dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
+       dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
+       dispatch_set(SSH2_MSG_CHANNEL_OPEN, &server_input_channel_open);
+       dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
+       dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
+       dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &channel_input_channel_request);
+       dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
+}
+void
+server_init_dispatch_13()
+{
+       debug("server_init_dispatch_13");
+       dispatch_init(NULL);
+       dispatch_set(SSH_CMSG_EOF, &server_input_eof);
+       dispatch_set(SSH_CMSG_STDIN_DATA, &server_input_stdin_data);
+       dispatch_set(SSH_CMSG_WINDOW_SIZE, &server_input_window_size);
+       dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
+       dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
+       dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
+       dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
+       dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
+       dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
+}
+void
+server_init_dispatch_15()
+{
+       server_init_dispatch_13();
+       debug("server_init_dispatch_15");
+       dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
+       dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_oclose);
+}
+void
+server_init_dispatch()
+{
+       if (compat20)
+               server_init_dispatch_20();
+       else if (compat13)
+               server_init_dispatch_13();
+       else
+               server_init_dispatch_15();
+}
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