| /* |
| * Author: Tatu Ylonen <ylo@cs.hut.fi> |
| * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| * All rights reserved |
| * The main loop for the interactive session (client side). |
| * |
| * 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". |
| * |
| * |
| * Copyright (c) 1999 Theo de Raadt. 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. |
| * |
| * |
| * SSH2 support added by Markus Friedl. |
| * Copyright (c) 1999, 2000, 2001 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: clientloop.c,v 1.116 2003/12/09 23:45:32 dtucker Exp $"); |
| |
| #include "ssh.h" |
| #include "ssh1.h" |
| #include "ssh2.h" |
| #include "xmalloc.h" |
| #include "packet.h" |
| #include "buffer.h" |
| #include "compat.h" |
| #include "channels.h" |
| #include "dispatch.h" |
| #include "buffer.h" |
| #include "bufaux.h" |
| #include "key.h" |
| #include "kex.h" |
| #include "log.h" |
| #include "readconf.h" |
| #include "clientloop.h" |
| #include "authfd.h" |
| #include "atomicio.h" |
| #include "sshtty.h" |
| #include "misc.h" |
| #include "readpass.h" |
| |
| /* import options */ |
| extern Options options; |
| |
| /* Flag indicating that stdin should be redirected from /dev/null. */ |
| extern int stdin_null_flag; |
| |
| /* Flag indicating that no shell has been requested */ |
| extern int no_shell_flag; |
| |
| /* |
| * Name of the host we are connecting to. This is the name given on the |
| * command line, or the HostName specified for the user-supplied name in a |
| * configuration file. |
| */ |
| extern char *host; |
| |
| /* |
| * Flag to indicate that we have received a window change signal which has |
| * not yet been processed. This will cause a message indicating the new |
| * window size to be sent to the server a little later. This is volatile |
| * because this is updated in a signal handler. |
| */ |
| static volatile sig_atomic_t received_window_change_signal = 0; |
| static volatile sig_atomic_t received_signal = 0; |
| |
| /* Flag indicating whether the user\'s terminal is in non-blocking mode. */ |
| static int in_non_blocking_mode = 0; |
| |
| /* Common data for the client loop code. */ |
| static int quit_pending; /* Set to non-zero to quit the client loop. */ |
| static int escape_char; /* Escape character. */ |
| static int escape_pending; /* Last character was the escape character */ |
| static int last_was_cr; /* Last character was a newline. */ |
| static int exit_status; /* Used to store the exit status of the command. */ |
| static int stdin_eof; /* EOF has been encountered on standard error. */ |
| static Buffer stdin_buffer; /* Buffer for stdin data. */ |
| static Buffer stdout_buffer; /* Buffer for stdout data. */ |
| static Buffer stderr_buffer; /* Buffer for stderr data. */ |
| static u_long stdin_bytes, stdout_bytes, stderr_bytes; |
| static u_int buffer_high;/* Soft max buffer size. */ |
| static int connection_in; /* Connection to server (input). */ |
| static int connection_out; /* Connection to server (output). */ |
| static int need_rekeying; /* Set to non-zero if rekeying is requested. */ |
| static int session_closed = 0; /* In SSH2: login session closed. */ |
| |
| static void client_init_dispatch(void); |
| int session_ident = -1; |
| |
| /*XXX*/ |
| extern Kex *xxx_kex; |
| |
| /* Restores stdin to blocking mode. */ |
| |
| static void |
| leave_non_blocking(void) |
| { |
| if (in_non_blocking_mode) { |
| (void) fcntl(fileno(stdin), F_SETFL, 0); |
| in_non_blocking_mode = 0; |
| } |
| } |
| |
| /* Puts stdin terminal in non-blocking mode. */ |
| |
| static void |
| enter_non_blocking(void) |
| { |
| in_non_blocking_mode = 1; |
| (void) fcntl(fileno(stdin), F_SETFL, O_NONBLOCK); |
| } |
| |
| /* |
| * Signal handler for the window change signal (SIGWINCH). This just sets a |
| * flag indicating that the window has changed. |
| */ |
| |
| static void |
| window_change_handler(int sig) |
| { |
| received_window_change_signal = 1; |
| signal(SIGWINCH, window_change_handler); |
| } |
| |
| /* |
| * Signal handler for signals that cause the program to terminate. These |
| * signals must be trapped to restore terminal modes. |
| */ |
| |
| static void |
| signal_handler(int sig) |
| { |
| received_signal = sig; |
| quit_pending = 1; |
| } |
| |
| /* |
| * Returns current time in seconds from Jan 1, 1970 with the maximum |
| * available resolution. |
| */ |
| |
| static double |
| get_current_time(void) |
| { |
| struct timeval tv; |
| gettimeofday(&tv, NULL); |
| return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0; |
| } |
| |
| /* |
| * This is called when the interactive is entered. This checks if there is |
| * an EOF coming on stdin. We must check this explicitly, as select() does |
| * not appear to wake up when redirecting from /dev/null. |
| */ |
| |
| static void |
| client_check_initial_eof_on_stdin(void) |
| { |
| int len; |
| char buf[1]; |
| |
| /* |
| * If standard input is to be "redirected from /dev/null", we simply |
| * mark that we have seen an EOF and send an EOF message to the |
| * server. Otherwise, we try to read a single character; it appears |
| * that for some files, such /dev/null, select() never wakes up for |
| * read for this descriptor, which means that we never get EOF. This |
| * way we will get the EOF if stdin comes from /dev/null or similar. |
| */ |
| if (stdin_null_flag) { |
| /* Fake EOF on stdin. */ |
| debug("Sending eof."); |
| stdin_eof = 1; |
| packet_start(SSH_CMSG_EOF); |
| packet_send(); |
| } else { |
| enter_non_blocking(); |
| |
| /* Check for immediate EOF on stdin. */ |
| len = read(fileno(stdin), buf, 1); |
| if (len == 0) { |
| /* EOF. Record that we have seen it and send EOF to server. */ |
| debug("Sending eof."); |
| stdin_eof = 1; |
| packet_start(SSH_CMSG_EOF); |
| packet_send(); |
| } else if (len > 0) { |
| /* |
| * Got data. We must store the data in the buffer, |
| * and also process it as an escape character if |
| * appropriate. |
| */ |
| if ((u_char) buf[0] == escape_char) |
| escape_pending = 1; |
| else |
| buffer_append(&stdin_buffer, buf, 1); |
| } |
| leave_non_blocking(); |
| } |
| } |
| |
| |
| /* |
| * Make packets from buffered stdin data, and buffer them for sending to the |
| * connection. |
| */ |
| |
| static void |
| client_make_packets_from_stdin_data(void) |
| { |
| u_int len; |
| |
| /* Send buffered stdin data to the server. */ |
| while (buffer_len(&stdin_buffer) > 0 && |
| packet_not_very_much_data_to_write()) { |
| len = buffer_len(&stdin_buffer); |
| /* Keep the packets at reasonable size. */ |
| if (len > packet_get_maxsize()) |
| len = packet_get_maxsize(); |
| packet_start(SSH_CMSG_STDIN_DATA); |
| packet_put_string(buffer_ptr(&stdin_buffer), len); |
| packet_send(); |
| buffer_consume(&stdin_buffer, len); |
| stdin_bytes += len; |
| /* If we have a pending EOF, send it now. */ |
| if (stdin_eof && buffer_len(&stdin_buffer) == 0) { |
| packet_start(SSH_CMSG_EOF); |
| packet_send(); |
| } |
| } |
| } |
| |
| /* |
| * Checks if the client window has changed, and sends a packet about it to |
| * the server if so. The actual change is detected elsewhere (by a software |
| * interrupt on Unix); this just checks the flag and sends a message if |
| * appropriate. |
| */ |
| |
| static void |
| client_check_window_change(void) |
| { |
| struct winsize ws; |
| |
| if (! received_window_change_signal) |
| return; |
| /** XXX race */ |
| received_window_change_signal = 0; |
| |
| if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) |
| return; |
| |
| debug2("client_check_window_change: changed"); |
| |
| if (compat20) { |
| channel_request_start(session_ident, "window-change", 0); |
| packet_put_int(ws.ws_col); |
| packet_put_int(ws.ws_row); |
| packet_put_int(ws.ws_xpixel); |
| packet_put_int(ws.ws_ypixel); |
| packet_send(); |
| } else { |
| packet_start(SSH_CMSG_WINDOW_SIZE); |
| packet_put_int(ws.ws_row); |
| packet_put_int(ws.ws_col); |
| packet_put_int(ws.ws_xpixel); |
| packet_put_int(ws.ws_ypixel); |
| packet_send(); |
| } |
| } |
| |
| /* |
| * Waits until the client can do something (some data becomes available on |
| * one of the file descriptors). |
| */ |
| |
| static void |
| client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, |
| int *maxfdp, int *nallocp, int rekeying) |
| { |
| /* Add any selections by the channel mechanism. */ |
| channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying); |
| |
| if (!compat20) { |
| /* Read from the connection, unless our buffers are full. */ |
| if (buffer_len(&stdout_buffer) < buffer_high && |
| buffer_len(&stderr_buffer) < buffer_high && |
| channel_not_very_much_buffered_data()) |
| FD_SET(connection_in, *readsetp); |
| /* |
| * Read from stdin, unless we have seen EOF or have very much |
| * buffered data to send to the server. |
| */ |
| if (!stdin_eof && packet_not_very_much_data_to_write()) |
| FD_SET(fileno(stdin), *readsetp); |
| |
| /* Select stdout/stderr if have data in buffer. */ |
| if (buffer_len(&stdout_buffer) > 0) |
| FD_SET(fileno(stdout), *writesetp); |
| if (buffer_len(&stderr_buffer) > 0) |
| FD_SET(fileno(stderr), *writesetp); |
| } else { |
| /* channel_prepare_select could have closed the last channel */ |
| if (session_closed && !channel_still_open() && |
| !packet_have_data_to_write()) { |
| /* clear mask since we did not call select() */ |
| memset(*readsetp, 0, *nallocp); |
| memset(*writesetp, 0, *nallocp); |
| return; |
| } else { |
| FD_SET(connection_in, *readsetp); |
| } |
| } |
| |
| /* Select server connection if have data to write to the server. */ |
| if (packet_have_data_to_write()) |
| FD_SET(connection_out, *writesetp); |
| |
| /* |
| * Wait for something to happen. This will suspend the process until |
| * some selected descriptor can be read, written, or has some other |
| * event pending. Note: if you want to implement SSH_MSG_IGNORE |
| * messages to fool traffic analysis, this might be the place to do |
| * it: just have a random timeout for the select, and send a random |
| * SSH_MSG_IGNORE packet when the timeout expires. |
| */ |
| |
| if (select((*maxfdp)+1, *readsetp, *writesetp, NULL, NULL) < 0) { |
| char buf[100]; |
| |
| /* |
| * We have to clear the select masks, because we return. |
| * We have to return, because the mainloop checks for the flags |
| * set by the signal handlers. |
| */ |
| memset(*readsetp, 0, *nallocp); |
| memset(*writesetp, 0, *nallocp); |
| |
| if (errno == EINTR) |
| return; |
| /* Note: we might still have data in the buffers. */ |
| snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno)); |
| buffer_append(&stderr_buffer, buf, strlen(buf)); |
| quit_pending = 1; |
| } |
| } |
| |
| static void |
| client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr) |
| { |
| struct winsize oldws, newws; |
| |
| /* Flush stdout and stderr buffers. */ |
| if (buffer_len(bout) > 0) |
| atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout)); |
| if (buffer_len(berr) > 0) |
| atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr)); |
| |
| leave_raw_mode(); |
| |
| /* |
| * Free (and clear) the buffer to reduce the amount of data that gets |
| * written to swap. |
| */ |
| buffer_free(bin); |
| buffer_free(bout); |
| buffer_free(berr); |
| |
| /* Save old window size. */ |
| ioctl(fileno(stdin), TIOCGWINSZ, &oldws); |
| |
| /* Send the suspend signal to the program itself. */ |
| kill(getpid(), SIGTSTP); |
| |
| /* Check if the window size has changed. */ |
| if (ioctl(fileno(stdin), TIOCGWINSZ, &newws) >= 0 && |
| (oldws.ws_row != newws.ws_row || |
| oldws.ws_col != newws.ws_col || |
| oldws.ws_xpixel != newws.ws_xpixel || |
| oldws.ws_ypixel != newws.ws_ypixel)) |
| received_window_change_signal = 1; |
| |
| /* OK, we have been continued by the user. Reinitialize buffers. */ |
| buffer_init(bin); |
| buffer_init(bout); |
| buffer_init(berr); |
| |
| enter_raw_mode(); |
| } |
| |
| static void |
| client_process_net_input(fd_set * readset) |
| { |
| int len; |
| char buf[8192]; |
| |
| /* |
| * Read input from the server, and add any such data to the buffer of |
| * the packet subsystem. |
| */ |
| if (FD_ISSET(connection_in, readset)) { |
| /* Read as much as possible. */ |
| len = read(connection_in, buf, sizeof(buf)); |
| if (len == 0) { |
| /* Received EOF. The remote host has closed the connection. */ |
| snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n", |
| host); |
| buffer_append(&stderr_buffer, buf, strlen(buf)); |
| quit_pending = 1; |
| return; |
| } |
| /* |
| * 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 || errno == EINTR)) |
| len = 0; |
| |
| if (len < 0) { |
| /* An error has encountered. Perhaps there is a network problem. */ |
| snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n", |
| host, strerror(errno)); |
| buffer_append(&stderr_buffer, buf, strlen(buf)); |
| quit_pending = 1; |
| return; |
| } |
| packet_process_incoming(buf, len); |
| } |
| } |
| |
| static void |
| process_cmdline(void) |
| { |
| void (*handler)(int); |
| char *s, *cmd; |
| u_short fwd_port, fwd_host_port; |
| char buf[1024], sfwd_port[6], sfwd_host_port[6]; |
| int local = 0; |
| |
| leave_raw_mode(); |
| handler = signal(SIGINT, SIG_IGN); |
| cmd = s = read_passphrase("\r\nssh> ", RP_ECHO); |
| if (s == NULL) |
| goto out; |
| while (*s && isspace(*s)) |
| s++; |
| if (*s == 0) |
| goto out; |
| if (strlen(s) < 2 || s[0] != '-' || !(s[1] == 'L' || s[1] == 'R')) { |
| logit("Invalid command."); |
| goto out; |
| } |
| if (s[1] == 'L') |
| local = 1; |
| if (!local && !compat20) { |
| logit("Not supported for SSH protocol version 1."); |
| goto out; |
| } |
| s += 2; |
| while (*s && isspace(*s)) |
| s++; |
| |
| if (sscanf(s, "%5[0-9]:%255[^:]:%5[0-9]", |
| sfwd_port, buf, sfwd_host_port) != 3 && |
| sscanf(s, "%5[0-9]/%255[^/]/%5[0-9]", |
| sfwd_port, buf, sfwd_host_port) != 3) { |
| logit("Bad forwarding specification."); |
| goto out; |
| } |
| if ((fwd_port = a2port(sfwd_port)) == 0 || |
| (fwd_host_port = a2port(sfwd_host_port)) == 0) { |
| logit("Bad forwarding port(s)."); |
| goto out; |
| } |
| if (local) { |
| if (channel_setup_local_fwd_listener(fwd_port, buf, |
| fwd_host_port, options.gateway_ports) < 0) { |
| logit("Port forwarding failed."); |
| goto out; |
| } |
| } else |
| channel_request_remote_forwarding(fwd_port, buf, |
| fwd_host_port); |
| logit("Forwarding port."); |
| out: |
| signal(SIGINT, handler); |
| enter_raw_mode(); |
| if (cmd) |
| xfree(cmd); |
| } |
| |
| /* process the characters one by one */ |
| static int |
| process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len) |
| { |
| char string[1024]; |
| pid_t pid; |
| int bytes = 0; |
| u_int i; |
| u_char ch; |
| char *s; |
| |
| for (i = 0; i < len; i++) { |
| /* Get one character at a time. */ |
| ch = buf[i]; |
| |
| if (escape_pending) { |
| /* We have previously seen an escape character. */ |
| /* Clear the flag now. */ |
| escape_pending = 0; |
| |
| /* Process the escaped character. */ |
| switch (ch) { |
| case '.': |
| /* Terminate the connection. */ |
| snprintf(string, sizeof string, "%c.\r\n", escape_char); |
| buffer_append(berr, string, strlen(string)); |
| |
| quit_pending = 1; |
| return -1; |
| |
| case 'Z' - 64: |
| /* Suspend the program. */ |
| /* Print a message to that effect to the user. */ |
| snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char); |
| buffer_append(berr, string, strlen(string)); |
| |
| /* Restore terminal modes and suspend. */ |
| client_suspend_self(bin, bout, berr); |
| |
| /* We have been continued. */ |
| continue; |
| |
| case 'B': |
| if (compat20) { |
| snprintf(string, sizeof string, |
| "%cB\r\n", escape_char); |
| buffer_append(berr, string, |
| strlen(string)); |
| channel_request_start(session_ident, |
| "break", 0); |
| packet_put_int(1000); |
| packet_send(); |
| } |
| continue; |
| |
| case 'R': |
| if (compat20) { |
| if (datafellows & SSH_BUG_NOREKEY) |
| logit("Server does not support re-keying"); |
| else |
| need_rekeying = 1; |
| } |
| continue; |
| |
| case '&': |
| /* |
| * Detach the program (continue to serve connections, |
| * but put in background and no more new connections). |
| */ |
| /* Restore tty modes. */ |
| leave_raw_mode(); |
| |
| /* Stop listening for new connections. */ |
| channel_stop_listening(); |
| |
| snprintf(string, sizeof string, |
| "%c& [backgrounded]\n", escape_char); |
| buffer_append(berr, string, strlen(string)); |
| |
| /* Fork into background. */ |
| pid = fork(); |
| if (pid < 0) { |
| error("fork: %.100s", strerror(errno)); |
| continue; |
| } |
| if (pid != 0) { /* This is the parent. */ |
| /* The parent just exits. */ |
| exit(0); |
| } |
| /* The child continues serving connections. */ |
| if (compat20) { |
| buffer_append(bin, "\004", 1); |
| /* fake EOF on stdin */ |
| return -1; |
| } else if (!stdin_eof) { |
| /* |
| * Sending SSH_CMSG_EOF alone does not always appear |
| * to be enough. So we try to send an EOF character |
| * first. |
| */ |
| packet_start(SSH_CMSG_STDIN_DATA); |
| packet_put_string("\004", 1); |
| packet_send(); |
| /* Close stdin. */ |
| stdin_eof = 1; |
| if (buffer_len(bin) == 0) { |
| packet_start(SSH_CMSG_EOF); |
| packet_send(); |
| } |
| } |
| continue; |
| |
| case '?': |
| snprintf(string, sizeof string, |
| "%c?\r\n\ |
| Supported escape sequences:\r\n\ |
| %c. - terminate connection\r\n\ |
| %cB - send a BREAK to the remote system\r\n\ |
| %cC - open a command line\r\n\ |
| %cR - Request rekey (SSH protocol 2 only)\r\n\ |
| %c^Z - suspend ssh\r\n\ |
| %c# - list forwarded connections\r\n\ |
| %c& - background ssh (when waiting for connections to terminate)\r\n\ |
| %c? - this message\r\n\ |
| %c%c - send the escape character by typing it twice\r\n\ |
| (Note that escapes are only recognized immediately after newline.)\r\n", |
| escape_char, escape_char, escape_char, escape_char, |
| escape_char, escape_char, escape_char, escape_char, |
| escape_char, escape_char, escape_char); |
| buffer_append(berr, string, strlen(string)); |
| continue; |
| |
| case '#': |
| snprintf(string, sizeof string, "%c#\r\n", escape_char); |
| buffer_append(berr, string, strlen(string)); |
| s = channel_open_message(); |
| buffer_append(berr, s, strlen(s)); |
| xfree(s); |
| continue; |
| |
| case 'C': |
| process_cmdline(); |
| continue; |
| |
| default: |
| if (ch != escape_char) { |
| buffer_put_char(bin, escape_char); |
| bytes++; |
| } |
| /* Escaped characters fall through here */ |
| break; |
| } |
| } else { |
| /* |
| * The previous character was not an escape char. Check if this |
| * is an escape. |
| */ |
| if (last_was_cr && ch == escape_char) { |
| /* It is. Set the flag and continue to next character. */ |
| escape_pending = 1; |
| continue; |
| } |
| } |
| |
| /* |
| * Normal character. Record whether it was a newline, |
| * and append it to the buffer. |
| */ |
| last_was_cr = (ch == '\r' || ch == '\n'); |
| buffer_put_char(bin, ch); |
| bytes++; |
| } |
| return bytes; |
| } |
| |
| static void |
| client_process_input(fd_set * readset) |
| { |
| int len; |
| char buf[8192]; |
| |
| /* Read input from stdin. */ |
| if (FD_ISSET(fileno(stdin), readset)) { |
| /* Read as much as possible. */ |
| len = read(fileno(stdin), buf, sizeof(buf)); |
| if (len < 0 && (errno == EAGAIN || errno == EINTR)) |
| return; /* we'll try again later */ |
| if (len <= 0) { |
| /* |
| * Received EOF or error. They are treated |
| * similarly, except that an error message is printed |
| * if it was an error condition. |
| */ |
| if (len < 0) { |
| snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno)); |
| buffer_append(&stderr_buffer, buf, strlen(buf)); |
| } |
| /* Mark that we have seen EOF. */ |
| stdin_eof = 1; |
| /* |
| * Send an EOF message to the server unless there is |
| * data in the buffer. If there is data in the |
| * buffer, no message will be sent now. Code |
| * elsewhere will send the EOF when the buffer |
| * becomes empty if stdin_eof is set. |
| */ |
| if (buffer_len(&stdin_buffer) == 0) { |
| packet_start(SSH_CMSG_EOF); |
| packet_send(); |
| } |
| } else if (escape_char == SSH_ESCAPECHAR_NONE) { |
| /* |
| * Normal successful read, and no escape character. |
| * Just append the data to buffer. |
| */ |
| buffer_append(&stdin_buffer, buf, len); |
| } else { |
| /* |
| * Normal, successful read. But we have an escape character |
| * and have to process the characters one by one. |
| */ |
| if (process_escapes(&stdin_buffer, &stdout_buffer, |
| &stderr_buffer, buf, len) == -1) |
| return; |
| } |
| } |
| } |
| |
| static void |
| client_process_output(fd_set * writeset) |
| { |
| int len; |
| char buf[100]; |
| |
| /* Write buffered output to stdout. */ |
| if (FD_ISSET(fileno(stdout), writeset)) { |
| /* Write as much data as possible. */ |
| len = write(fileno(stdout), buffer_ptr(&stdout_buffer), |
| buffer_len(&stdout_buffer)); |
| if (len <= 0) { |
| if (errno == EINTR || errno == EAGAIN) |
| len = 0; |
| else { |
| /* |
| * An error or EOF was encountered. Put an |
| * error message to stderr buffer. |
| */ |
| snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno)); |
| buffer_append(&stderr_buffer, buf, strlen(buf)); |
| quit_pending = 1; |
| return; |
| } |
| } |
| /* Consume printed data from the buffer. */ |
| buffer_consume(&stdout_buffer, len); |
| stdout_bytes += len; |
| } |
| /* Write buffered output to stderr. */ |
| if (FD_ISSET(fileno(stderr), writeset)) { |
| /* Write as much data as possible. */ |
| len = write(fileno(stderr), buffer_ptr(&stderr_buffer), |
| buffer_len(&stderr_buffer)); |
| if (len <= 0) { |
| if (errno == EINTR || errno == EAGAIN) |
| len = 0; |
| else { |
| /* EOF or error, but can't even print error message. */ |
| quit_pending = 1; |
| return; |
| } |
| } |
| /* Consume printed characters from the buffer. */ |
| buffer_consume(&stderr_buffer, len); |
| stderr_bytes += len; |
| } |
| } |
| |
| /* |
| * Get packets from the connection input buffer, and process them as long as |
| * there are packets available. |
| * |
| * Any unknown packets received during the actual |
| * session cause the session to terminate. This is |
| * intended to make debugging easier since no |
| * confirmations are sent. Any compatible protocol |
| * extensions must be negotiated during the |
| * preparatory phase. |
| */ |
| |
| static void |
| client_process_buffered_input_packets(void) |
| { |
| dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL); |
| } |
| |
| /* scan buf[] for '~' before sending data to the peer */ |
| |
| static int |
| simple_escape_filter(Channel *c, char *buf, int len) |
| { |
| /* XXX we assume c->extended is writeable */ |
| return process_escapes(&c->input, &c->output, &c->extended, buf, len); |
| } |
| |
| static void |
| client_channel_closed(int id, void *arg) |
| { |
| if (id != session_ident) |
| error("client_channel_closed: id %d != session_ident %d", |
| id, session_ident); |
| channel_cancel_cleanup(id); |
| session_closed = 1; |
| leave_raw_mode(); |
| } |
| |
| /* |
| * Implements the interactive session with the server. This is called after |
| * the user has been authenticated, and a command has been started on the |
| * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character |
| * used as an escape character for terminating or suspending the session. |
| */ |
| |
| int |
| client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id) |
| { |
| fd_set *readset = NULL, *writeset = NULL; |
| double start_time, total_time; |
| int max_fd = 0, max_fd2 = 0, len, rekeying = 0, nalloc = 0; |
| char buf[100]; |
| |
| debug("Entering interactive session."); |
| |
| start_time = get_current_time(); |
| |
| /* Initialize variables. */ |
| escape_pending = 0; |
| last_was_cr = 1; |
| exit_status = -1; |
| stdin_eof = 0; |
| buffer_high = 64 * 1024; |
| connection_in = packet_get_connection_in(); |
| connection_out = packet_get_connection_out(); |
| max_fd = MAX(connection_in, connection_out); |
| |
| if (!compat20) { |
| /* enable nonblocking unless tty */ |
| if (!isatty(fileno(stdin))) |
| set_nonblock(fileno(stdin)); |
| if (!isatty(fileno(stdout))) |
| set_nonblock(fileno(stdout)); |
| if (!isatty(fileno(stderr))) |
| set_nonblock(fileno(stderr)); |
| max_fd = MAX(max_fd, fileno(stdin)); |
| max_fd = MAX(max_fd, fileno(stdout)); |
| max_fd = MAX(max_fd, fileno(stderr)); |
| } |
| stdin_bytes = 0; |
| stdout_bytes = 0; |
| stderr_bytes = 0; |
| quit_pending = 0; |
| escape_char = escape_char_arg; |
| |
| /* Initialize buffers. */ |
| buffer_init(&stdin_buffer); |
| buffer_init(&stdout_buffer); |
| buffer_init(&stderr_buffer); |
| |
| client_init_dispatch(); |
| |
| /* |
| * Set signal handlers, (e.g. to restore non-blocking mode) |
| * but don't overwrite SIG_IGN, matches behaviour from rsh(1) |
| */ |
| if (signal(SIGINT, SIG_IGN) != SIG_IGN) |
| signal(SIGINT, signal_handler); |
| if (signal(SIGQUIT, SIG_IGN) != SIG_IGN) |
| signal(SIGQUIT, signal_handler); |
| if (signal(SIGTERM, SIG_IGN) != SIG_IGN) |
| signal(SIGTERM, signal_handler); |
| if (have_pty) |
| signal(SIGWINCH, window_change_handler); |
| |
| if (have_pty) |
| enter_raw_mode(); |
| |
| if (compat20) { |
| session_ident = ssh2_chan_id; |
| if (escape_char != SSH_ESCAPECHAR_NONE) |
| channel_register_filter(session_ident, |
| simple_escape_filter); |
| if (session_ident != -1) |
| channel_register_cleanup(session_ident, |
| client_channel_closed); |
| } else { |
| /* Check if we should immediately send eof on stdin. */ |
| client_check_initial_eof_on_stdin(); |
| } |
| |
| /* Main loop of the client for the interactive session mode. */ |
| while (!quit_pending) { |
| |
| /* Process buffered packets sent by the server. */ |
| client_process_buffered_input_packets(); |
| |
| if (compat20 && session_closed && !channel_still_open()) |
| break; |
| |
| rekeying = (xxx_kex != NULL && !xxx_kex->done); |
| |
| if (rekeying) { |
| debug("rekeying in progress"); |
| } else { |
| /* |
| * Make packets of buffered stdin data, and buffer |
| * them for sending to the server. |
| */ |
| if (!compat20) |
| client_make_packets_from_stdin_data(); |
| |
| /* |
| * Make packets from buffered channel data, and |
| * enqueue them for sending to the server. |
| */ |
| if (packet_not_very_much_data_to_write()) |
| channel_output_poll(); |
| |
| /* |
| * Check if the window size has changed, and buffer a |
| * message about it to the server if so. |
| */ |
| client_check_window_change(); |
| |
| if (quit_pending) |
| break; |
| } |
| /* |
| * Wait until we have something to do (something becomes |
| * available on one of the descriptors). |
| */ |
| max_fd2 = max_fd; |
| client_wait_until_can_do_something(&readset, &writeset, |
| &max_fd2, &nalloc, rekeying); |
| |
| if (quit_pending) |
| break; |
| |
| /* Do channel operations unless rekeying in progress. */ |
| if (!rekeying) { |
| channel_after_select(readset, writeset); |
| if (need_rekeying || packet_need_rekeying()) { |
| debug("need rekeying"); |
| xxx_kex->done = 0; |
| kex_send_kexinit(xxx_kex); |
| need_rekeying = 0; |
| } |
| } |
| |
| /* Buffer input from the connection. */ |
| client_process_net_input(readset); |
| |
| if (quit_pending) |
| break; |
| |
| if (!compat20) { |
| /* Buffer data from stdin */ |
| client_process_input(readset); |
| /* |
| * Process output to stdout and stderr. Output to |
| * the connection is processed elsewhere (above). |
| */ |
| client_process_output(writeset); |
| } |
| |
| /* Send as much buffered packet data as possible to the sender. */ |
| if (FD_ISSET(connection_out, writeset)) |
| packet_write_poll(); |
| } |
| if (readset) |
| xfree(readset); |
| if (writeset) |
| xfree(writeset); |
| |
| /* Terminate the session. */ |
| |
| /* Stop watching for window change. */ |
| if (have_pty) |
| signal(SIGWINCH, SIG_DFL); |
| |
| channel_free_all(); |
| |
| if (have_pty) |
| leave_raw_mode(); |
| |
| /* restore blocking io */ |
| if (!isatty(fileno(stdin))) |
| unset_nonblock(fileno(stdin)); |
| if (!isatty(fileno(stdout))) |
| unset_nonblock(fileno(stdout)); |
| if (!isatty(fileno(stderr))) |
| unset_nonblock(fileno(stderr)); |
| |
| /* |
| * If there was no shell or command requested, there will be no remote |
| * exit status to be returned. In that case, clear error code if the |
| * connection was deliberately terminated at this end. |
| */ |
| if (no_shell_flag && received_signal == SIGTERM) { |
| received_signal = 0; |
| exit_status = 0; |
| } |
| |
| if (received_signal) |
| fatal("Killed by signal %d.", (int) received_signal); |
| |
| /* |
| * In interactive mode (with pseudo tty) display a message indicating |
| * that the connection has been closed. |
| */ |
| if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) { |
| snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host); |
| buffer_append(&stderr_buffer, buf, strlen(buf)); |
| } |
| |
| /* Output any buffered data for stdout. */ |
| while (buffer_len(&stdout_buffer) > 0) { |
| len = write(fileno(stdout), buffer_ptr(&stdout_buffer), |
| buffer_len(&stdout_buffer)); |
| if (len <= 0) { |
| error("Write failed flushing stdout buffer."); |
| break; |
| } |
| buffer_consume(&stdout_buffer, len); |
| stdout_bytes += len; |
| } |
| |
| /* Output any buffered data for stderr. */ |
| while (buffer_len(&stderr_buffer) > 0) { |
| len = write(fileno(stderr), buffer_ptr(&stderr_buffer), |
| buffer_len(&stderr_buffer)); |
| if (len <= 0) { |
| error("Write failed flushing stderr buffer."); |
| break; |
| } |
| buffer_consume(&stderr_buffer, len); |
| stderr_bytes += len; |
| } |
| |
| /* Clear and free any buffers. */ |
| memset(buf, 0, sizeof(buf)); |
| buffer_free(&stdin_buffer); |
| buffer_free(&stdout_buffer); |
| buffer_free(&stderr_buffer); |
| |
| /* Report bytes transferred, and transfer rates. */ |
| total_time = get_current_time() - start_time; |
| debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds", |
| stdin_bytes, stdout_bytes, stderr_bytes, total_time); |
| if (total_time > 0) |
| debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f", |
| stdin_bytes / total_time, stdout_bytes / total_time, |
| stderr_bytes / total_time); |
| |
| /* Return the exit status of the program. */ |
| debug("Exit status %d", exit_status); |
| return exit_status; |
| } |
| |
| /*********/ |
| |
| static void |
| client_input_stdout_data(int type, u_int32_t seq, void *ctxt) |
| { |
| u_int data_len; |
| char *data = packet_get_string(&data_len); |
| packet_check_eom(); |
| buffer_append(&stdout_buffer, data, data_len); |
| memset(data, 0, data_len); |
| xfree(data); |
| } |
| static void |
| client_input_stderr_data(int type, u_int32_t seq, void *ctxt) |
| { |
| u_int data_len; |
| char *data = packet_get_string(&data_len); |
| packet_check_eom(); |
| buffer_append(&stderr_buffer, data, data_len); |
| memset(data, 0, data_len); |
| xfree(data); |
| } |
| static void |
| client_input_exit_status(int type, u_int32_t seq, void *ctxt) |
| { |
| exit_status = packet_get_int(); |
| packet_check_eom(); |
| /* Acknowledge the exit. */ |
| packet_start(SSH_CMSG_EXIT_CONFIRMATION); |
| packet_send(); |
| /* |
| * Must wait for packet to be sent since we are |
| * exiting the loop. |
| */ |
| packet_write_wait(); |
| /* Flag that we want to exit. */ |
| quit_pending = 1; |
| } |
| static void |
| client_input_agent_open(int type, u_int32_t seq, void *ctxt) |
| { |
| Channel *c = NULL; |
| int remote_id, sock; |
| |
| /* Read the remote channel number from the message. */ |
| remote_id = packet_get_int(); |
| packet_check_eom(); |
| |
| /* |
| * Get a connection to the local authentication agent (this may again |
| * get forwarded). |
| */ |
| sock = ssh_get_authentication_socket(); |
| |
| /* |
| * If we could not connect the agent, send an error message back to |
| * the server. This should never happen unless the agent dies, |
| * because authentication forwarding is only enabled if we have an |
| * agent. |
| */ |
| if (sock >= 0) { |
| c = channel_new("", SSH_CHANNEL_OPEN, sock, sock, |
| -1, 0, 0, 0, "authentication agent connection", 1); |
| c->remote_id = remote_id; |
| c->force_drain = 1; |
| } |
| if (c == NULL) { |
| packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
| packet_put_int(remote_id); |
| } else { |
| /* Send a confirmation to the remote host. */ |
| debug("Forwarding authentication connection."); |
| packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); |
| packet_put_int(remote_id); |
| packet_put_int(c->self); |
| } |
| packet_send(); |
| } |
| |
| static Channel * |
| client_request_forwarded_tcpip(const char *request_type, int rchan) |
| { |
| Channel *c = NULL; |
| char *listen_address, *originator_address; |
| int listen_port, originator_port; |
| int sock; |
| |
| /* Get rest of the packet */ |
| listen_address = packet_get_string(NULL); |
| listen_port = packet_get_int(); |
| originator_address = packet_get_string(NULL); |
| originator_port = packet_get_int(); |
| packet_check_eom(); |
| |
| debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d", |
| listen_address, listen_port, originator_address, originator_port); |
| |
| sock = channel_connect_by_listen_address(listen_port); |
| if (sock < 0) { |
| xfree(originator_address); |
| xfree(listen_address); |
| return NULL; |
| } |
| c = channel_new("forwarded-tcpip", |
| SSH_CHANNEL_CONNECTING, sock, sock, -1, |
| CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0, |
| originator_address, 1); |
| xfree(originator_address); |
| xfree(listen_address); |
| return c; |
| } |
| |
| static Channel * |
| client_request_x11(const char *request_type, int rchan) |
| { |
| Channel *c = NULL; |
| char *originator; |
| int originator_port; |
| int sock; |
| |
| if (!options.forward_x11) { |
| error("Warning: ssh server tried X11 forwarding."); |
| error("Warning: this is probably a break in attempt by a malicious server."); |
| return NULL; |
| } |
| originator = packet_get_string(NULL); |
| if (datafellows & SSH_BUG_X11FWD) { |
| debug2("buggy server: x11 request w/o originator_port"); |
| originator_port = 0; |
| } else { |
| originator_port = packet_get_int(); |
| } |
| packet_check_eom(); |
| /* XXX check permission */ |
| debug("client_request_x11: request from %s %d", originator, |
| originator_port); |
| xfree(originator); |
| sock = x11_connect_display(); |
| if (sock < 0) |
| return NULL; |
| c = channel_new("x11", |
| SSH_CHANNEL_X11_OPEN, sock, sock, -1, |
| CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1); |
| c->force_drain = 1; |
| return c; |
| } |
| |
| static Channel * |
| client_request_agent(const char *request_type, int rchan) |
| { |
| Channel *c = NULL; |
| int sock; |
| |
| if (!options.forward_agent) { |
| error("Warning: ssh server tried agent forwarding."); |
| error("Warning: this is probably a break in attempt by a malicious server."); |
| return NULL; |
| } |
| sock = ssh_get_authentication_socket(); |
| if (sock < 0) |
| return NULL; |
| c = channel_new("authentication agent connection", |
| SSH_CHANNEL_OPEN, sock, sock, -1, |
| CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0, |
| "authentication agent connection", 1); |
| c->force_drain = 1; |
| return c; |
| } |
| |
| /* XXXX move to generic input handler */ |
| static void |
| client_input_channel_open(int type, u_int32_t seq, void *ctxt) |
| { |
| Channel *c = NULL; |
| char *ctype; |
| int rchan; |
| u_int rmaxpack, rwindow, len; |
| |
| ctype = packet_get_string(&len); |
| rchan = packet_get_int(); |
| rwindow = packet_get_int(); |
| rmaxpack = packet_get_int(); |
| |
| debug("client_input_channel_open: ctype %s rchan %d win %d max %d", |
| ctype, rchan, rwindow, rmaxpack); |
| |
| if (strcmp(ctype, "forwarded-tcpip") == 0) { |
| c = client_request_forwarded_tcpip(ctype, rchan); |
| } else if (strcmp(ctype, "x11") == 0) { |
| c = client_request_x11(ctype, rchan); |
| } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) { |
| c = client_request_agent(ctype, rchan); |
| } |
| /* XXX duplicate : */ |
| if (c != NULL) { |
| debug("confirm %s", ctype); |
| c->remote_id = rchan; |
| c->remote_window = rwindow; |
| c->remote_maxpacket = rmaxpack; |
| if (c->type != SSH_CHANNEL_CONNECTING) { |
| 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); |
| if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
| packet_put_cstring("open failed"); |
| packet_put_cstring(""); |
| } |
| packet_send(); |
| } |
| xfree(ctype); |
| } |
| static void |
| client_input_channel_req(int type, u_int32_t seq, void *ctxt) |
| { |
| Channel *c = NULL; |
| int id, reply, success = 0; |
| char *rtype; |
| |
| id = packet_get_int(); |
| rtype = packet_get_string(NULL); |
| reply = packet_get_char(); |
| |
| debug("client_input_channel_req: channel %d rtype %s reply %d", |
| id, rtype, reply); |
| |
| if (session_ident == -1) { |
| error("client_input_channel_req: no channel %d", session_ident); |
| } else if (id != session_ident) { |
| error("client_input_channel_req: channel %d: wrong channel: %d", |
| session_ident, id); |
| } |
| c = channel_lookup(id); |
| if (c == NULL) { |
| error("client_input_channel_req: channel %d: unknown channel", id); |
| } else if (strcmp(rtype, "exit-status") == 0) { |
| success = 1; |
| exit_status = packet_get_int(); |
| packet_check_eom(); |
| } |
| if (reply) { |
| packet_start(success ? |
| SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); |
| packet_put_int(c->remote_id); |
| packet_send(); |
| } |
| xfree(rtype); |
| } |
| static void |
| client_input_global_request(int type, u_int32_t seq, void *ctxt) |
| { |
| char *rtype; |
| int want_reply; |
| int success = 0; |
| |
| rtype = packet_get_string(NULL); |
| want_reply = packet_get_char(); |
| debug("client_input_global_request: rtype %s want_reply %d", rtype, want_reply); |
| if (want_reply) { |
| packet_start(success ? |
| SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE); |
| packet_send(); |
| packet_write_wait(); |
| } |
| xfree(rtype); |
| } |
| |
| static void |
| client_init_dispatch_20(void) |
| { |
| 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, &client_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, &client_input_channel_req); |
| dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); |
| dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request); |
| |
| /* rekeying */ |
| dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit); |
| |
| /* global request reply messages */ |
| dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply); |
| dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply); |
| } |
| static void |
| client_init_dispatch_13(void) |
| { |
| dispatch_init(NULL); |
| 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); |
| dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status); |
| dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data); |
| dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data); |
| |
| dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ? |
| &client_input_agent_open : &deny_input_open); |
| dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ? |
| &x11_input_open : &deny_input_open); |
| } |
| static void |
| client_init_dispatch_15(void) |
| { |
| client_init_dispatch_13(); |
| dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); |
| dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose); |
| } |
| static void |
| client_init_dispatch(void) |
| { |
| if (compat20) |
| client_init_dispatch_20(); |
| else if (compat13) |
| client_init_dispatch_13(); |
| else |
| client_init_dispatch_15(); |
| } |
| |
| /* client specific fatal cleanup */ |
| void |
| cleanup_exit(int i) |
| { |
| leave_raw_mode(); |
| leave_non_blocking(); |
| _exit(i); |
| } |