Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 4 | * All rights reserved |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 5 | * The main loop for the interactive session (client side). |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 6 | * |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 7 | * As far as I am concerned, the code I have written for this software |
| 8 | * can be used freely for any purpose. Any derived versions of this |
| 9 | * software must be clearly marked as such, and if the derived work is |
| 10 | * incompatible with the protocol description in the RFC file, it must be |
| 11 | * called by a name other than "ssh" or "Secure Shell". |
| 12 | * |
| 13 | * |
| 14 | * Copyright (c) 1999 Theo de Raadt. All rights reserved. |
| 15 | * |
| 16 | * Redistribution and use in source and binary forms, with or without |
| 17 | * modification, are permitted provided that the following conditions |
| 18 | * are met: |
| 19 | * 1. Redistributions of source code must retain the above copyright |
| 20 | * notice, this list of conditions and the following disclaimer. |
| 21 | * 2. Redistributions in binary form must reproduce the above copyright |
| 22 | * notice, this list of conditions and the following disclaimer in the |
| 23 | * documentation and/or other materials provided with the distribution. |
| 24 | * |
| 25 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 26 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 27 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 28 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 29 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 30 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 31 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 32 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 33 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 34 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 35 | * |
| 36 | * |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 37 | * SSH2 support added by Markus Friedl. |
Ben Lindstrom | 4469723 | 2001-07-04 03:32:30 +0000 | [diff] [blame] | 38 | * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved. |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 39 | * |
| 40 | * Redistribution and use in source and binary forms, with or without |
| 41 | * modification, are permitted provided that the following conditions |
| 42 | * are met: |
| 43 | * 1. Redistributions of source code must retain the above copyright |
| 44 | * notice, this list of conditions and the following disclaimer. |
| 45 | * 2. Redistributions in binary form must reproduce the above copyright |
| 46 | * notice, this list of conditions and the following disclaimer in the |
| 47 | * documentation and/or other materials provided with the distribution. |
| 48 | * |
| 49 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 50 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 51 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 52 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 53 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 54 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 55 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 56 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 57 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 58 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 59 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 60 | |
| 61 | #include "includes.h" |
Damien Miller | 03e66f6 | 2004-06-15 15:47:51 +1000 | [diff] [blame] | 62 | RCSID("$OpenBSD: clientloop.c,v 1.125 2004/06/15 05:45:04 djm Exp $"); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 63 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 64 | #include "ssh.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 65 | #include "ssh1.h" |
| 66 | #include "ssh2.h" |
| 67 | #include "xmalloc.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 68 | #include "packet.h" |
| 69 | #include "buffer.h" |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 70 | #include "compat.h" |
Ben Lindstrom | c763767 | 2001-06-09 00:36:26 +0000 | [diff] [blame] | 71 | #include "channels.h" |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 72 | #include "dispatch.h" |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 73 | #include "buffer.h" |
| 74 | #include "bufaux.h" |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 75 | #include "key.h" |
Ben Lindstrom | f28f634 | 2001-04-04 02:03:04 +0000 | [diff] [blame] | 76 | #include "kex.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 77 | #include "log.h" |
| 78 | #include "readconf.h" |
Ben Lindstrom | bf555ba | 2001-01-18 02:04:35 +0000 | [diff] [blame] | 79 | #include "clientloop.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 80 | #include "authfd.h" |
| 81 | #include "atomicio.h" |
Darren Tucker | 06f2bd8 | 2004-05-13 16:06:46 +1000 | [diff] [blame] | 82 | #include "sshpty.h" |
Ben Lindstrom | 302ea6f | 2001-04-16 02:01:25 +0000 | [diff] [blame] | 83 | #include "misc.h" |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 84 | #include "monitor_fdpass.h" |
| 85 | #include "match.h" |
| 86 | #include "msg.h" |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 87 | |
| 88 | /* import options */ |
| 89 | extern Options options; |
| 90 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 91 | /* Flag indicating that stdin should be redirected from /dev/null. */ |
| 92 | extern int stdin_null_flag; |
| 93 | |
Damien Miller | d696551 | 2003-12-17 16:31:53 +1100 | [diff] [blame] | 94 | /* Flag indicating that no shell has been requested */ |
| 95 | extern int no_shell_flag; |
| 96 | |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 97 | /* Control socket */ |
| 98 | extern int control_fd; |
| 99 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 100 | /* |
| 101 | * Name of the host we are connecting to. This is the name given on the |
| 102 | * command line, or the HostName specified for the user-supplied name in a |
| 103 | * configuration file. |
| 104 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 105 | extern char *host; |
| 106 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 107 | /* |
| 108 | * Flag to indicate that we have received a window change signal which has |
| 109 | * not yet been processed. This will cause a message indicating the new |
| 110 | * window size to be sent to the server a little later. This is volatile |
| 111 | * because this is updated in a signal handler. |
| 112 | */ |
Ben Lindstrom | 5e71c54 | 2001-12-06 16:48:14 +0000 | [diff] [blame] | 113 | static volatile sig_atomic_t received_window_change_signal = 0; |
| 114 | static volatile sig_atomic_t received_signal = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 115 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 116 | /* Flag indicating whether the user\'s terminal is in non-blocking mode. */ |
| 117 | static int in_non_blocking_mode = 0; |
| 118 | |
| 119 | /* Common data for the client loop code. */ |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 120 | static int quit_pending; /* Set to non-zero to quit the client loop. */ |
| 121 | static int escape_char; /* Escape character. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 122 | static int escape_pending; /* Last character was the escape character */ |
| 123 | static int last_was_cr; /* Last character was a newline. */ |
| 124 | static int exit_status; /* Used to store the exit status of the command. */ |
| 125 | static int stdin_eof; /* EOF has been encountered on standard error. */ |
| 126 | static Buffer stdin_buffer; /* Buffer for stdin data. */ |
| 127 | static Buffer stdout_buffer; /* Buffer for stdout data. */ |
| 128 | static Buffer stderr_buffer; /* Buffer for stderr data. */ |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 129 | static u_long stdin_bytes, stdout_bytes, stderr_bytes; |
| 130 | static u_int buffer_high;/* Soft max buffer size. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 131 | static int connection_in; /* Connection to server (input). */ |
| 132 | static int connection_out; /* Connection to server (output). */ |
Ben Lindstrom | be2cc43 | 2001-04-04 23:46:07 +0000 | [diff] [blame] | 133 | static int need_rekeying; /* Set to non-zero if rekeying is requested. */ |
Ben Lindstrom | 4c3f77d | 2001-04-05 23:37:36 +0000 | [diff] [blame] | 134 | static int session_closed = 0; /* In SSH2: login session closed. */ |
Damien Miller | 509b010 | 2003-12-17 16:33:10 +1100 | [diff] [blame] | 135 | static int server_alive_timeouts = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 136 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 137 | static void client_init_dispatch(void); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 138 | int session_ident = -1; |
| 139 | |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 140 | struct confirm_ctx { |
| 141 | int want_tty; |
| 142 | int want_subsys; |
| 143 | Buffer cmd; |
| 144 | char *term; |
| 145 | struct termios tio; |
| 146 | }; |
| 147 | |
Ben Lindstrom | f28f634 | 2001-04-04 02:03:04 +0000 | [diff] [blame] | 148 | /*XXX*/ |
| 149 | extern Kex *xxx_kex; |
| 150 | |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 151 | void ssh_process_session2_setup(int, int, int, Buffer *); |
| 152 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 153 | /* Restores stdin to blocking mode. */ |
| 154 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 155 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 156 | leave_non_blocking(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 157 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 158 | if (in_non_blocking_mode) { |
Damien Miller | 03e66f6 | 2004-06-15 15:47:51 +1000 | [diff] [blame] | 159 | unset_nonblock(fileno(stdin)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 160 | in_non_blocking_mode = 0; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 161 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 162 | } |
| 163 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 164 | /* Puts stdin terminal in non-blocking mode. */ |
| 165 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 166 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 167 | enter_non_blocking(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 168 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 169 | in_non_blocking_mode = 1; |
Damien Miller | 232711f | 2004-06-15 10:35:30 +1000 | [diff] [blame] | 170 | set_nonblock(fileno(stdin)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 171 | } |
| 172 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 173 | /* |
| 174 | * Signal handler for the window change signal (SIGWINCH). This just sets a |
| 175 | * flag indicating that the window has changed. |
| 176 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 177 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 178 | static void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 179 | window_change_handler(int sig) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 180 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 181 | received_window_change_signal = 1; |
| 182 | signal(SIGWINCH, window_change_handler); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 183 | } |
| 184 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 185 | /* |
| 186 | * Signal handler for signals that cause the program to terminate. These |
| 187 | * signals must be trapped to restore terminal modes. |
| 188 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 189 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 190 | static void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 191 | signal_handler(int sig) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 192 | { |
Ben Lindstrom | ec46e0b | 2001-06-09 01:27:31 +0000 | [diff] [blame] | 193 | received_signal = sig; |
| 194 | quit_pending = 1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 195 | } |
| 196 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 197 | /* |
| 198 | * Returns current time in seconds from Jan 1, 1970 with the maximum |
| 199 | * available resolution. |
| 200 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 201 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 202 | static double |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 203 | get_current_time(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 204 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 205 | struct timeval tv; |
| 206 | gettimeofday(&tv, NULL); |
| 207 | return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 208 | } |
| 209 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 210 | /* |
| 211 | * This is called when the interactive is entered. This checks if there is |
| 212 | * an EOF coming on stdin. We must check this explicitly, as select() does |
| 213 | * not appear to wake up when redirecting from /dev/null. |
| 214 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 215 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 216 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 217 | client_check_initial_eof_on_stdin(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 218 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 219 | int len; |
| 220 | char buf[1]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 221 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 222 | /* |
| 223 | * If standard input is to be "redirected from /dev/null", we simply |
| 224 | * mark that we have seen an EOF and send an EOF message to the |
| 225 | * server. Otherwise, we try to read a single character; it appears |
| 226 | * that for some files, such /dev/null, select() never wakes up for |
| 227 | * read for this descriptor, which means that we never get EOF. This |
| 228 | * way we will get the EOF if stdin comes from /dev/null or similar. |
| 229 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 230 | if (stdin_null_flag) { |
| 231 | /* Fake EOF on stdin. */ |
| 232 | debug("Sending eof."); |
| 233 | stdin_eof = 1; |
| 234 | packet_start(SSH_CMSG_EOF); |
| 235 | packet_send(); |
| 236 | } else { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 237 | enter_non_blocking(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 238 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 239 | /* Check for immediate EOF on stdin. */ |
| 240 | len = read(fileno(stdin), buf, 1); |
| 241 | if (len == 0) { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 242 | /* EOF. Record that we have seen it and send EOF to server. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 243 | debug("Sending eof."); |
| 244 | stdin_eof = 1; |
| 245 | packet_start(SSH_CMSG_EOF); |
| 246 | packet_send(); |
| 247 | } else if (len > 0) { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 248 | /* |
| 249 | * Got data. We must store the data in the buffer, |
| 250 | * and also process it as an escape character if |
| 251 | * appropriate. |
| 252 | */ |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 253 | if ((u_char) buf[0] == escape_char) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 254 | escape_pending = 1; |
Ben Lindstrom | e9613cf | 2001-03-05 06:14:02 +0000 | [diff] [blame] | 255 | else |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 256 | buffer_append(&stdin_buffer, buf, 1); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 257 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 258 | leave_non_blocking(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 259 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 260 | } |
| 261 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 262 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 263 | /* |
| 264 | * Make packets from buffered stdin data, and buffer them for sending to the |
| 265 | * connection. |
| 266 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 267 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 268 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 269 | client_make_packets_from_stdin_data(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 270 | { |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 271 | u_int len; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 272 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 273 | /* Send buffered stdin data to the server. */ |
| 274 | while (buffer_len(&stdin_buffer) > 0 && |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 275 | packet_not_very_much_data_to_write()) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 276 | len = buffer_len(&stdin_buffer); |
| 277 | /* Keep the packets at reasonable size. */ |
| 278 | if (len > packet_get_maxsize()) |
| 279 | len = packet_get_maxsize(); |
| 280 | packet_start(SSH_CMSG_STDIN_DATA); |
| 281 | packet_put_string(buffer_ptr(&stdin_buffer), len); |
| 282 | packet_send(); |
| 283 | buffer_consume(&stdin_buffer, len); |
Ben Lindstrom | e9613cf | 2001-03-05 06:14:02 +0000 | [diff] [blame] | 284 | stdin_bytes += len; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 285 | /* If we have a pending EOF, send it now. */ |
| 286 | if (stdin_eof && buffer_len(&stdin_buffer) == 0) { |
| 287 | packet_start(SSH_CMSG_EOF); |
| 288 | packet_send(); |
| 289 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 290 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 291 | } |
| 292 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 293 | /* |
| 294 | * Checks if the client window has changed, and sends a packet about it to |
| 295 | * the server if so. The actual change is detected elsewhere (by a software |
| 296 | * interrupt on Unix); this just checks the flag and sends a message if |
| 297 | * appropriate. |
| 298 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 299 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 300 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 301 | client_check_window_change(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 302 | { |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 303 | struct winsize ws; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 304 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 305 | if (! received_window_change_signal) |
| 306 | return; |
| 307 | /** XXX race */ |
| 308 | received_window_change_signal = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 309 | |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 310 | debug2("client_check_window_change: changed"); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 311 | |
| 312 | if (compat20) { |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 313 | channel_send_window_changes(); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 314 | } else { |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 315 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) |
| 316 | return; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 317 | packet_start(SSH_CMSG_WINDOW_SIZE); |
| 318 | packet_put_int(ws.ws_row); |
| 319 | packet_put_int(ws.ws_col); |
| 320 | packet_put_int(ws.ws_xpixel); |
| 321 | packet_put_int(ws.ws_ypixel); |
| 322 | packet_send(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 323 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 324 | } |
| 325 | |
Damien Miller | 509b010 | 2003-12-17 16:33:10 +1100 | [diff] [blame] | 326 | static void |
| 327 | client_global_request_reply(int type, u_int32_t seq, void *ctxt) |
| 328 | { |
| 329 | server_alive_timeouts = 0; |
| 330 | client_global_request_reply_fwd(type, seq, ctxt); |
| 331 | } |
| 332 | |
| 333 | static void |
| 334 | server_alive_check(void) |
| 335 | { |
| 336 | if (++server_alive_timeouts > options.server_alive_count_max) |
| 337 | packet_disconnect("Timeout, server not responding."); |
| 338 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
| 339 | packet_put_cstring("keepalive@openssh.com"); |
| 340 | packet_put_char(1); /* boolean: want reply */ |
| 341 | packet_send(); |
| 342 | } |
| 343 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 344 | /* |
| 345 | * Waits until the client can do something (some data becomes available on |
| 346 | * one of the file descriptors). |
| 347 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 348 | static void |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 349 | client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 350 | int *maxfdp, int *nallocp, int rekeying) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 351 | { |
Damien Miller | 509b010 | 2003-12-17 16:33:10 +1100 | [diff] [blame] | 352 | struct timeval tv, *tvp; |
| 353 | int ret; |
| 354 | |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 355 | /* Add any selections by the channel mechanism. */ |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 356 | channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 357 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 358 | if (!compat20) { |
| 359 | /* Read from the connection, unless our buffers are full. */ |
| 360 | if (buffer_len(&stdout_buffer) < buffer_high && |
| 361 | buffer_len(&stderr_buffer) < buffer_high && |
| 362 | channel_not_very_much_buffered_data()) |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 363 | FD_SET(connection_in, *readsetp); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 364 | /* |
| 365 | * Read from stdin, unless we have seen EOF or have very much |
| 366 | * buffered data to send to the server. |
| 367 | */ |
| 368 | if (!stdin_eof && packet_not_very_much_data_to_write()) |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 369 | FD_SET(fileno(stdin), *readsetp); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 370 | |
| 371 | /* Select stdout/stderr if have data in buffer. */ |
| 372 | if (buffer_len(&stdout_buffer) > 0) |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 373 | FD_SET(fileno(stdout), *writesetp); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 374 | if (buffer_len(&stderr_buffer) > 0) |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 375 | FD_SET(fileno(stderr), *writesetp); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 376 | } else { |
Ben Lindstrom | c8b3f47 | 2001-05-17 03:19:40 +0000 | [diff] [blame] | 377 | /* channel_prepare_select could have closed the last channel */ |
Damien Miller | 164a7f4 | 2001-10-12 11:36:09 +1000 | [diff] [blame] | 378 | if (session_closed && !channel_still_open() && |
| 379 | !packet_have_data_to_write()) { |
| 380 | /* clear mask since we did not call select() */ |
Damien Miller | 79faeff | 2001-11-12 11:06:32 +1100 | [diff] [blame] | 381 | memset(*readsetp, 0, *nallocp); |
| 382 | memset(*writesetp, 0, *nallocp); |
Damien Miller | 164a7f4 | 2001-10-12 11:36:09 +1000 | [diff] [blame] | 383 | return; |
Ben Lindstrom | c8b3f47 | 2001-05-17 03:19:40 +0000 | [diff] [blame] | 384 | } else { |
| 385 | FD_SET(connection_in, *readsetp); |
| 386 | } |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 387 | } |
| 388 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 389 | /* Select server connection if have data to write to the server. */ |
| 390 | if (packet_have_data_to_write()) |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 391 | FD_SET(connection_out, *writesetp); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 392 | |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 393 | if (control_fd != -1) |
| 394 | FD_SET(control_fd, *readsetp); |
| 395 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 396 | /* |
| 397 | * Wait for something to happen. This will suspend the process until |
| 398 | * some selected descriptor can be read, written, or has some other |
Damien Miller | 509b010 | 2003-12-17 16:33:10 +1100 | [diff] [blame] | 399 | * event pending. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 400 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 401 | |
Damien Miller | 509b010 | 2003-12-17 16:33:10 +1100 | [diff] [blame] | 402 | if (options.server_alive_interval == 0 || !compat20) |
| 403 | tvp = NULL; |
| 404 | else { |
| 405 | tv.tv_sec = options.server_alive_interval; |
| 406 | tv.tv_usec = 0; |
| 407 | tvp = &tv; |
| 408 | } |
| 409 | ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp); |
| 410 | if (ret < 0) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 411 | char buf[100]; |
Ben Lindstrom | f945251 | 2001-02-15 03:12:08 +0000 | [diff] [blame] | 412 | |
| 413 | /* |
| 414 | * We have to clear the select masks, because we return. |
| 415 | * We have to return, because the mainloop checks for the flags |
| 416 | * set by the signal handlers. |
| 417 | */ |
Damien Miller | 79faeff | 2001-11-12 11:06:32 +1100 | [diff] [blame] | 418 | memset(*readsetp, 0, *nallocp); |
| 419 | memset(*writesetp, 0, *nallocp); |
Ben Lindstrom | f945251 | 2001-02-15 03:12:08 +0000 | [diff] [blame] | 420 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 421 | if (errno == EINTR) |
| 422 | return; |
| 423 | /* Note: we might still have data in the buffers. */ |
| 424 | snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno)); |
| 425 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 426 | quit_pending = 1; |
Damien Miller | 509b010 | 2003-12-17 16:33:10 +1100 | [diff] [blame] | 427 | } else if (ret == 0) |
| 428 | server_alive_check(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 429 | } |
| 430 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 431 | static void |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 432 | client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 433 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 434 | struct winsize oldws, newws; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 435 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 436 | /* Flush stdout and stderr buffers. */ |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 437 | if (buffer_len(bout) > 0) |
Darren Tucker | 9f63f22 | 2003-07-03 13:46:56 +1000 | [diff] [blame] | 438 | atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout)); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 439 | if (buffer_len(berr) > 0) |
Darren Tucker | 9f63f22 | 2003-07-03 13:46:56 +1000 | [diff] [blame] | 440 | atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 441 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 442 | leave_raw_mode(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 443 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 444 | /* |
| 445 | * Free (and clear) the buffer to reduce the amount of data that gets |
| 446 | * written to swap. |
| 447 | */ |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 448 | buffer_free(bin); |
| 449 | buffer_free(bout); |
| 450 | buffer_free(berr); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 451 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 452 | /* Save old window size. */ |
| 453 | ioctl(fileno(stdin), TIOCGWINSZ, &oldws); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 454 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 455 | /* Send the suspend signal to the program itself. */ |
| 456 | kill(getpid(), SIGTSTP); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 457 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 458 | /* Check if the window size has changed. */ |
| 459 | if (ioctl(fileno(stdin), TIOCGWINSZ, &newws) >= 0 && |
| 460 | (oldws.ws_row != newws.ws_row || |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 461 | oldws.ws_col != newws.ws_col || |
| 462 | oldws.ws_xpixel != newws.ws_xpixel || |
| 463 | oldws.ws_ypixel != newws.ws_ypixel)) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 464 | received_window_change_signal = 1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 465 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 466 | /* OK, we have been continued by the user. Reinitialize buffers. */ |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 467 | buffer_init(bin); |
| 468 | buffer_init(bout); |
| 469 | buffer_init(berr); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 470 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 471 | enter_raw_mode(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 472 | } |
| 473 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 474 | static void |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 475 | client_process_net_input(fd_set * readset) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 476 | { |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 477 | int len; |
| 478 | char buf[8192]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 479 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 480 | /* |
| 481 | * Read input from the server, and add any such data to the buffer of |
| 482 | * the packet subsystem. |
| 483 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 484 | if (FD_ISSET(connection_in, readset)) { |
| 485 | /* Read as much as possible. */ |
| 486 | len = read(connection_in, buf, sizeof(buf)); |
| 487 | if (len == 0) { |
| 488 | /* Received EOF. The remote host has closed the connection. */ |
| 489 | snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n", |
| 490 | host); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 491 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 492 | quit_pending = 1; |
| 493 | return; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 494 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 495 | /* |
| 496 | * There is a kernel bug on Solaris that causes select to |
| 497 | * sometimes wake up even though there is no data available. |
| 498 | */ |
Ben Lindstrom | ebc8827 | 2001-03-06 03:34:40 +0000 | [diff] [blame] | 499 | if (len < 0 && (errno == EAGAIN || errno == EINTR)) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 500 | len = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 501 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 502 | if (len < 0) { |
| 503 | /* An error has encountered. Perhaps there is a network problem. */ |
| 504 | snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n", |
| 505 | host, strerror(errno)); |
| 506 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 507 | quit_pending = 1; |
| 508 | return; |
| 509 | } |
| 510 | packet_process_incoming(buf, len); |
| 511 | } |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 512 | } |
| 513 | |
Ben Lindstrom | 5589f4b | 2002-03-22 03:24:32 +0000 | [diff] [blame] | 514 | static void |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 515 | client_subsystem_reply(int type, u_int32_t seq, void *ctxt) |
| 516 | { |
| 517 | int id; |
| 518 | Channel *c; |
| 519 | |
| 520 | id = packet_get_int(); |
| 521 | packet_check_eom(); |
| 522 | |
| 523 | if ((c = channel_lookup(id)) == NULL) { |
| 524 | error("%s: no channel for id %d", __func__, id); |
| 525 | return; |
| 526 | } |
| 527 | |
| 528 | if (type == SSH2_MSG_CHANNEL_SUCCESS) |
| 529 | debug2("Request suceeded on channel %d", id); |
| 530 | else if (type == SSH2_MSG_CHANNEL_FAILURE) { |
| 531 | error("Request failed on channel %d", id); |
| 532 | channel_free(c); |
| 533 | } |
| 534 | } |
| 535 | |
| 536 | static void |
| 537 | client_extra_session2_setup(int id, void *arg) |
| 538 | { |
| 539 | struct confirm_ctx *cctx = arg; |
| 540 | Channel *c; |
| 541 | |
| 542 | if (cctx == NULL) |
| 543 | fatal("%s: cctx == NULL", __func__); |
| 544 | if ((c = channel_lookup(id)) == NULL) |
| 545 | fatal("%s: no channel for id %d", __func__, id); |
| 546 | |
| 547 | client_session2_setup(id, cctx->want_tty, cctx->want_subsys, |
| 548 | cctx->term, &cctx->tio, c->rfd, &cctx->cmd, |
| 549 | client_subsystem_reply); |
| 550 | |
| 551 | c->confirm_ctx = NULL; |
| 552 | buffer_free(&cctx->cmd); |
| 553 | free(cctx->term); |
| 554 | free(cctx); |
| 555 | } |
| 556 | |
| 557 | static void |
| 558 | client_process_control(fd_set * readset) |
| 559 | { |
| 560 | Buffer m; |
| 561 | Channel *c; |
| 562 | int client_fd, new_fd[3], ver; |
| 563 | socklen_t addrlen; |
| 564 | struct sockaddr_storage addr; |
| 565 | struct confirm_ctx *cctx; |
| 566 | char *cmd; |
| 567 | u_int len; |
| 568 | uid_t euid; |
| 569 | gid_t egid; |
| 570 | |
| 571 | /* |
| 572 | * Accept connection on control socket |
| 573 | */ |
| 574 | if (control_fd == -1 || !FD_ISSET(control_fd, readset)) |
| 575 | return; |
| 576 | |
| 577 | memset(&addr, 0, sizeof(addr)); |
| 578 | addrlen = sizeof(addr); |
| 579 | if ((client_fd = accept(control_fd, |
| 580 | (struct sockaddr*)&addr, &addrlen)) == -1) { |
| 581 | error("%s accept: %s", __func__, strerror(errno)); |
| 582 | return; |
| 583 | } |
| 584 | |
| 585 | if (getpeereid(client_fd, &euid, &egid) < 0) { |
| 586 | error("%s getpeereid failed: %s", __func__, strerror(errno)); |
| 587 | close(client_fd); |
| 588 | return; |
| 589 | } |
| 590 | if ((euid != 0) && (getuid() != euid)) { |
| 591 | error("control mode uid mismatch: peer euid %u != uid %u", |
| 592 | (u_int) euid, (u_int) getuid()); |
| 593 | close(client_fd); |
| 594 | return; |
| 595 | } |
| 596 | /* XXX: implement use of ssh-askpass to confirm additional channels */ |
| 597 | |
| 598 | unset_nonblock(client_fd); |
| 599 | |
| 600 | buffer_init(&m); |
| 601 | |
| 602 | buffer_put_int(&m, getpid()); |
| 603 | if (ssh_msg_send(client_fd, /* version */0, &m) == -1) { |
| 604 | error("%s: client msg_send failed", __func__); |
| 605 | close(client_fd); |
| 606 | return; |
| 607 | } |
| 608 | buffer_clear(&m); |
| 609 | |
| 610 | if (ssh_msg_recv(client_fd, &m) == -1) { |
| 611 | error("%s: client msg_recv failed", __func__); |
| 612 | close(client_fd); |
| 613 | return; |
| 614 | } |
| 615 | |
| 616 | if ((ver = buffer_get_char(&m)) != 0) { |
| 617 | error("%s: wrong client version %d", __func__, ver); |
| 618 | buffer_free(&m); |
| 619 | close(client_fd); |
| 620 | return; |
| 621 | } |
| 622 | |
| 623 | cctx = xmalloc(sizeof(*cctx)); |
| 624 | memset(cctx, 0, sizeof(*cctx)); |
| 625 | |
| 626 | cctx->want_tty = buffer_get_int(&m); |
| 627 | cctx->want_subsys = buffer_get_int(&m); |
| 628 | cctx->term = buffer_get_string(&m, &len); |
| 629 | |
| 630 | cmd = buffer_get_string(&m, &len); |
| 631 | buffer_init(&cctx->cmd); |
| 632 | buffer_append(&cctx->cmd, cmd, strlen(cmd)); |
| 633 | |
| 634 | debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__, |
| 635 | cctx->want_tty, cctx->want_subsys, cmd); |
| 636 | |
| 637 | /* Gather fds from client */ |
| 638 | new_fd[0] = mm_receive_fd(client_fd); |
| 639 | new_fd[1] = mm_receive_fd(client_fd); |
| 640 | new_fd[2] = mm_receive_fd(client_fd); |
| 641 | |
| 642 | debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__, |
| 643 | new_fd[0], new_fd[1], new_fd[2]); |
| 644 | |
| 645 | /* Try to pick up ttymodes from client before it goes raw */ |
| 646 | if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1) |
| 647 | error("%s: tcgetattr: %s", __func__, strerror(errno)); |
| 648 | |
| 649 | buffer_clear(&m); |
| 650 | if (ssh_msg_send(client_fd, /* version */0, &m) == -1) { |
| 651 | error("%s: client msg_send failed", __func__); |
| 652 | close(client_fd); |
| 653 | close(new_fd[0]); |
| 654 | close(new_fd[1]); |
| 655 | close(new_fd[2]); |
| 656 | return; |
| 657 | } |
| 658 | buffer_free(&m); |
| 659 | |
| 660 | /* enable nonblocking unless tty */ |
| 661 | if (!isatty(new_fd[0])) |
| 662 | set_nonblock(new_fd[0]); |
| 663 | if (!isatty(new_fd[1])) |
| 664 | set_nonblock(new_fd[1]); |
| 665 | if (!isatty(new_fd[2])) |
| 666 | set_nonblock(new_fd[2]); |
| 667 | |
| 668 | set_nonblock(client_fd); |
| 669 | |
| 670 | c = channel_new("session", SSH_CHANNEL_OPENING, |
| 671 | new_fd[0], new_fd[1], new_fd[2], |
| 672 | CHAN_SES_WINDOW_DEFAULT, CHAN_SES_PACKET_DEFAULT, |
| 673 | CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0); |
| 674 | |
| 675 | /* XXX */ |
| 676 | c->ctl_fd = client_fd; |
| 677 | |
| 678 | debug3("%s: channel_new: %d", __func__, c->self); |
| 679 | |
| 680 | channel_send_open(c->self); |
| 681 | channel_register_confirm(c->self, client_extra_session2_setup, cctx); |
| 682 | } |
| 683 | |
| 684 | static void |
Ben Lindstrom | 681d932 | 2002-03-22 03:53:00 +0000 | [diff] [blame] | 685 | process_cmdline(void) |
Ben Lindstrom | 5589f4b | 2002-03-22 03:24:32 +0000 | [diff] [blame] | 686 | { |
Ben Lindstrom | 5589f4b | 2002-03-22 03:24:32 +0000 | [diff] [blame] | 687 | void (*handler)(int); |
| 688 | char *s, *cmd; |
| 689 | u_short fwd_port, fwd_host_port; |
| 690 | char buf[1024], sfwd_port[6], sfwd_host_port[6]; |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 691 | int delete = 0; |
Ben Lindstrom | 5589f4b | 2002-03-22 03:24:32 +0000 | [diff] [blame] | 692 | int local = 0; |
Ben Lindstrom | 5589f4b | 2002-03-22 03:24:32 +0000 | [diff] [blame] | 693 | |
| 694 | leave_raw_mode(); |
Ben Lindstrom | 5a6abda | 2002-06-09 19:41:48 +0000 | [diff] [blame] | 695 | handler = signal(SIGINT, SIG_IGN); |
Ben Lindstrom | 681d932 | 2002-03-22 03:53:00 +0000 | [diff] [blame] | 696 | cmd = s = read_passphrase("\r\nssh> ", RP_ECHO); |
Ben Lindstrom | 5589f4b | 2002-03-22 03:24:32 +0000 | [diff] [blame] | 697 | if (s == NULL) |
| 698 | goto out; |
Ben Lindstrom | 5589f4b | 2002-03-22 03:24:32 +0000 | [diff] [blame] | 699 | while (*s && isspace(*s)) |
| 700 | s++; |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 701 | if (*s == '-') |
| 702 | s++; /* Skip cmdline '-', if any */ |
Darren Tucker | e167582 | 2004-05-24 10:13:07 +1000 | [diff] [blame] | 703 | if (*s == '\0') |
Ben Lindstrom | 5589f4b | 2002-03-22 03:24:32 +0000 | [diff] [blame] | 704 | goto out; |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 705 | |
Darren Tucker | 1973c88 | 2004-05-24 10:34:36 +1000 | [diff] [blame] | 706 | if (*s == 'h' || *s == 'H' || *s == '?') { |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 707 | logit("Commands:"); |
| 708 | logit(" -Lport:host:hostport Request local forward"); |
| 709 | logit(" -Rport:host:hostport Request remote forward"); |
| 710 | logit(" -KRhostport Cancel remote forward"); |
| 711 | goto out; |
| 712 | } |
| 713 | |
| 714 | if (*s == 'K') { |
| 715 | delete = 1; |
| 716 | s++; |
| 717 | } |
| 718 | if (*s != 'L' && *s != 'R') { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 719 | logit("Invalid command."); |
Ben Lindstrom | 5589f4b | 2002-03-22 03:24:32 +0000 | [diff] [blame] | 720 | goto out; |
| 721 | } |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 722 | if (*s == 'L') |
Ben Lindstrom | 5589f4b | 2002-03-22 03:24:32 +0000 | [diff] [blame] | 723 | local = 1; |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 724 | if (local && delete) { |
| 725 | logit("Not supported."); |
| 726 | goto out; |
| 727 | } |
| 728 | if ((!local || delete) && !compat20) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 729 | logit("Not supported for SSH protocol version 1."); |
Ben Lindstrom | 5589f4b | 2002-03-22 03:24:32 +0000 | [diff] [blame] | 730 | goto out; |
| 731 | } |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 732 | |
| 733 | s++; |
Ben Lindstrom | 5589f4b | 2002-03-22 03:24:32 +0000 | [diff] [blame] | 734 | while (*s && isspace(*s)) |
| 735 | s++; |
| 736 | |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 737 | if (delete) { |
| 738 | if (sscanf(s, "%5[0-9]", sfwd_host_port) != 1) { |
| 739 | logit("Bad forwarding specification."); |
Ben Lindstrom | 5589f4b | 2002-03-22 03:24:32 +0000 | [diff] [blame] | 740 | goto out; |
| 741 | } |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 742 | if ((fwd_host_port = a2port(sfwd_host_port)) == 0) { |
| 743 | logit("Bad forwarding port(s)."); |
| 744 | goto out; |
| 745 | } |
| 746 | channel_request_rforward_cancel(fwd_host_port); |
| 747 | } else { |
| 748 | if (sscanf(s, "%5[0-9]:%255[^:]:%5[0-9]", |
| 749 | sfwd_port, buf, sfwd_host_port) != 3 && |
| 750 | sscanf(s, "%5[0-9]/%255[^/]/%5[0-9]", |
| 751 | sfwd_port, buf, sfwd_host_port) != 3) { |
| 752 | logit("Bad forwarding specification."); |
| 753 | goto out; |
| 754 | } |
| 755 | if ((fwd_port = a2port(sfwd_port)) == 0 || |
| 756 | (fwd_host_port = a2port(sfwd_host_port)) == 0) { |
| 757 | logit("Bad forwarding port(s)."); |
| 758 | goto out; |
| 759 | } |
| 760 | if (local) { |
| 761 | if (channel_setup_local_fwd_listener(fwd_port, buf, |
| 762 | fwd_host_port, options.gateway_ports) < 0) { |
| 763 | logit("Port forwarding failed."); |
| 764 | goto out; |
| 765 | } |
| 766 | } else |
| 767 | channel_request_remote_forwarding(fwd_port, buf, |
| 768 | fwd_host_port); |
| 769 | logit("Forwarding port."); |
| 770 | } |
| 771 | |
Ben Lindstrom | 5589f4b | 2002-03-22 03:24:32 +0000 | [diff] [blame] | 772 | out: |
| 773 | signal(SIGINT, handler); |
| 774 | enter_raw_mode(); |
| 775 | if (cmd) |
| 776 | xfree(cmd); |
| 777 | } |
| 778 | |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 779 | /* process the characters one by one */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 780 | static int |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 781 | process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len) |
| 782 | { |
| 783 | char string[1024]; |
| 784 | pid_t pid; |
| 785 | int bytes = 0; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 786 | u_int i; |
| 787 | u_char ch; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 788 | char *s; |
| 789 | |
| 790 | for (i = 0; i < len; i++) { |
| 791 | /* Get one character at a time. */ |
| 792 | ch = buf[i]; |
| 793 | |
| 794 | if (escape_pending) { |
| 795 | /* We have previously seen an escape character. */ |
| 796 | /* Clear the flag now. */ |
| 797 | escape_pending = 0; |
| 798 | |
| 799 | /* Process the escaped character. */ |
| 800 | switch (ch) { |
| 801 | case '.': |
| 802 | /* Terminate the connection. */ |
| 803 | snprintf(string, sizeof string, "%c.\r\n", escape_char); |
| 804 | buffer_append(berr, string, strlen(string)); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 805 | |
| 806 | quit_pending = 1; |
| 807 | return -1; |
| 808 | |
| 809 | case 'Z' - 64: |
| 810 | /* Suspend the program. */ |
| 811 | /* Print a message to that effect to the user. */ |
| 812 | snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char); |
| 813 | buffer_append(berr, string, strlen(string)); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 814 | |
| 815 | /* Restore terminal modes and suspend. */ |
| 816 | client_suspend_self(bin, bout, berr); |
| 817 | |
| 818 | /* We have been continued. */ |
| 819 | continue; |
| 820 | |
Damien Miller | 54c4598 | 2003-05-15 10:20:13 +1000 | [diff] [blame] | 821 | case 'B': |
| 822 | if (compat20) { |
| 823 | snprintf(string, sizeof string, |
| 824 | "%cB\r\n", escape_char); |
| 825 | buffer_append(berr, string, |
| 826 | strlen(string)); |
| 827 | channel_request_start(session_ident, |
| 828 | "break", 0); |
| 829 | packet_put_int(1000); |
| 830 | packet_send(); |
| 831 | } |
| 832 | continue; |
| 833 | |
Ben Lindstrom | f28f634 | 2001-04-04 02:03:04 +0000 | [diff] [blame] | 834 | case 'R': |
Ben Lindstrom | 11bd899 | 2001-04-05 23:34:29 +0000 | [diff] [blame] | 835 | if (compat20) { |
| 836 | if (datafellows & SSH_BUG_NOREKEY) |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 837 | logit("Server does not support re-keying"); |
Ben Lindstrom | 11bd899 | 2001-04-05 23:34:29 +0000 | [diff] [blame] | 838 | else |
| 839 | need_rekeying = 1; |
| 840 | } |
Ben Lindstrom | f28f634 | 2001-04-04 02:03:04 +0000 | [diff] [blame] | 841 | continue; |
| 842 | |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 843 | case '&': |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 844 | /* |
| 845 | * Detach the program (continue to serve connections, |
| 846 | * but put in background and no more new connections). |
| 847 | */ |
Damien Miller | 96507ef | 2001-11-12 10:52:25 +1100 | [diff] [blame] | 848 | /* Restore tty modes. */ |
| 849 | leave_raw_mode(); |
| 850 | |
| 851 | /* Stop listening for new connections. */ |
| 852 | channel_stop_listening(); |
| 853 | |
| 854 | snprintf(string, sizeof string, |
| 855 | "%c& [backgrounded]\n", escape_char); |
| 856 | buffer_append(berr, string, strlen(string)); |
| 857 | |
| 858 | /* Fork into background. */ |
| 859 | pid = fork(); |
| 860 | if (pid < 0) { |
| 861 | error("fork: %.100s", strerror(errno)); |
| 862 | continue; |
| 863 | } |
| 864 | if (pid != 0) { /* This is the parent. */ |
| 865 | /* The parent just exits. */ |
| 866 | exit(0); |
| 867 | } |
| 868 | /* The child continues serving connections. */ |
| 869 | if (compat20) { |
| 870 | buffer_append(bin, "\004", 1); |
| 871 | /* fake EOF on stdin */ |
| 872 | return -1; |
| 873 | } else if (!stdin_eof) { |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 874 | /* |
| 875 | * Sending SSH_CMSG_EOF alone does not always appear |
| 876 | * to be enough. So we try to send an EOF character |
| 877 | * first. |
| 878 | */ |
| 879 | packet_start(SSH_CMSG_STDIN_DATA); |
| 880 | packet_put_string("\004", 1); |
| 881 | packet_send(); |
| 882 | /* Close stdin. */ |
| 883 | stdin_eof = 1; |
| 884 | if (buffer_len(bin) == 0) { |
| 885 | packet_start(SSH_CMSG_EOF); |
| 886 | packet_send(); |
| 887 | } |
| 888 | } |
Damien Miller | 96507ef | 2001-11-12 10:52:25 +1100 | [diff] [blame] | 889 | continue; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 890 | |
| 891 | case '?': |
| 892 | snprintf(string, sizeof string, |
| 893 | "%c?\r\n\ |
| 894 | Supported escape sequences:\r\n\ |
Damien Miller | 0669286 | 2002-09-04 16:32:10 +1000 | [diff] [blame] | 895 | %c. - terminate connection\r\n\ |
Damien Miller | 54c4598 | 2003-05-15 10:20:13 +1000 | [diff] [blame] | 896 | %cB - send a BREAK to the remote system\r\n\ |
Damien Miller | 0669286 | 2002-09-04 16:32:10 +1000 | [diff] [blame] | 897 | %cC - open a command line\r\n\ |
| 898 | %cR - Request rekey (SSH protocol 2 only)\r\n\ |
| 899 | %c^Z - suspend ssh\r\n\ |
| 900 | %c# - list forwarded connections\r\n\ |
| 901 | %c& - background ssh (when waiting for connections to terminate)\r\n\ |
| 902 | %c? - this message\r\n\ |
| 903 | %c%c - send the escape character by typing it twice\r\n\ |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 904 | (Note that escapes are only recognized immediately after newline.)\r\n", |
Damien Miller | 0669286 | 2002-09-04 16:32:10 +1000 | [diff] [blame] | 905 | escape_char, escape_char, escape_char, escape_char, |
| 906 | escape_char, escape_char, escape_char, escape_char, |
Damien Miller | 54c4598 | 2003-05-15 10:20:13 +1000 | [diff] [blame] | 907 | escape_char, escape_char, escape_char); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 908 | buffer_append(berr, string, strlen(string)); |
| 909 | continue; |
| 910 | |
| 911 | case '#': |
| 912 | snprintf(string, sizeof string, "%c#\r\n", escape_char); |
| 913 | buffer_append(berr, string, strlen(string)); |
| 914 | s = channel_open_message(); |
| 915 | buffer_append(berr, s, strlen(s)); |
| 916 | xfree(s); |
| 917 | continue; |
| 918 | |
Ben Lindstrom | 5589f4b | 2002-03-22 03:24:32 +0000 | [diff] [blame] | 919 | case 'C': |
Ben Lindstrom | 681d932 | 2002-03-22 03:53:00 +0000 | [diff] [blame] | 920 | process_cmdline(); |
Ben Lindstrom | 5589f4b | 2002-03-22 03:24:32 +0000 | [diff] [blame] | 921 | continue; |
| 922 | |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 923 | default: |
| 924 | if (ch != escape_char) { |
| 925 | buffer_put_char(bin, escape_char); |
| 926 | bytes++; |
| 927 | } |
| 928 | /* Escaped characters fall through here */ |
| 929 | break; |
| 930 | } |
| 931 | } else { |
| 932 | /* |
| 933 | * The previous character was not an escape char. Check if this |
| 934 | * is an escape. |
| 935 | */ |
| 936 | if (last_was_cr && ch == escape_char) { |
| 937 | /* It is. Set the flag and continue to next character. */ |
| 938 | escape_pending = 1; |
| 939 | continue; |
| 940 | } |
| 941 | } |
| 942 | |
| 943 | /* |
| 944 | * Normal character. Record whether it was a newline, |
| 945 | * and append it to the buffer. |
| 946 | */ |
| 947 | last_was_cr = (ch == '\r' || ch == '\n'); |
| 948 | buffer_put_char(bin, ch); |
| 949 | bytes++; |
| 950 | } |
| 951 | return bytes; |
| 952 | } |
| 953 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 954 | static void |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 955 | client_process_input(fd_set * readset) |
| 956 | { |
Damien Miller | 166fca8 | 2000-04-20 07:42:21 +1000 | [diff] [blame] | 957 | int len; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 958 | char buf[8192]; |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 959 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 960 | /* Read input from stdin. */ |
| 961 | if (FD_ISSET(fileno(stdin), readset)) { |
| 962 | /* Read as much as possible. */ |
| 963 | len = read(fileno(stdin), buf, sizeof(buf)); |
Ben Lindstrom | 4c8cff1 | 2001-04-17 18:09:42 +0000 | [diff] [blame] | 964 | if (len < 0 && (errno == EAGAIN || errno == EINTR)) |
| 965 | return; /* we'll try again later */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 966 | if (len <= 0) { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 967 | /* |
| 968 | * Received EOF or error. They are treated |
| 969 | * similarly, except that an error message is printed |
| 970 | * if it was an error condition. |
| 971 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 972 | if (len < 0) { |
| 973 | snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno)); |
| 974 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 975 | } |
| 976 | /* Mark that we have seen EOF. */ |
| 977 | stdin_eof = 1; |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 978 | /* |
| 979 | * Send an EOF message to the server unless there is |
| 980 | * data in the buffer. If there is data in the |
| 981 | * buffer, no message will be sent now. Code |
| 982 | * elsewhere will send the EOF when the buffer |
| 983 | * becomes empty if stdin_eof is set. |
| 984 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 985 | if (buffer_len(&stdin_buffer) == 0) { |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 986 | packet_start(SSH_CMSG_EOF); |
| 987 | packet_send(); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 988 | } |
Ben Lindstrom | 2b1f71b | 2001-06-05 20:32:21 +0000 | [diff] [blame] | 989 | } else if (escape_char == SSH_ESCAPECHAR_NONE) { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 990 | /* |
| 991 | * Normal successful read, and no escape character. |
| 992 | * Just append the data to buffer. |
| 993 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 994 | buffer_append(&stdin_buffer, buf, len); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 995 | } else { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 996 | /* |
| 997 | * Normal, successful read. But we have an escape character |
| 998 | * and have to process the characters one by one. |
| 999 | */ |
Ben Lindstrom | e9613cf | 2001-03-05 06:14:02 +0000 | [diff] [blame] | 1000 | if (process_escapes(&stdin_buffer, &stdout_buffer, |
| 1001 | &stderr_buffer, buf, len) == -1) |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 1002 | return; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1003 | } |
| 1004 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1005 | } |
| 1006 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1007 | static void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1008 | client_process_output(fd_set * writeset) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1009 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1010 | int len; |
| 1011 | char buf[100]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1012 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1013 | /* Write buffered output to stdout. */ |
| 1014 | if (FD_ISSET(fileno(stdout), writeset)) { |
| 1015 | /* Write as much data as possible. */ |
| 1016 | len = write(fileno(stdout), buffer_ptr(&stdout_buffer), |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 1017 | buffer_len(&stdout_buffer)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1018 | if (len <= 0) { |
Ben Lindstrom | 4c8cff1 | 2001-04-17 18:09:42 +0000 | [diff] [blame] | 1019 | if (errno == EINTR || errno == EAGAIN) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1020 | len = 0; |
| 1021 | else { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1022 | /* |
| 1023 | * An error or EOF was encountered. Put an |
| 1024 | * error message to stderr buffer. |
| 1025 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1026 | snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno)); |
| 1027 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1028 | quit_pending = 1; |
| 1029 | return; |
| 1030 | } |
| 1031 | } |
| 1032 | /* Consume printed data from the buffer. */ |
| 1033 | buffer_consume(&stdout_buffer, len); |
Ben Lindstrom | a370005 | 2001-04-05 23:26:32 +0000 | [diff] [blame] | 1034 | stdout_bytes += len; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1035 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1036 | /* Write buffered output to stderr. */ |
| 1037 | if (FD_ISSET(fileno(stderr), writeset)) { |
| 1038 | /* Write as much data as possible. */ |
| 1039 | len = write(fileno(stderr), buffer_ptr(&stderr_buffer), |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 1040 | buffer_len(&stderr_buffer)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1041 | if (len <= 0) { |
Ben Lindstrom | 4c8cff1 | 2001-04-17 18:09:42 +0000 | [diff] [blame] | 1042 | if (errno == EINTR || errno == EAGAIN) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1043 | len = 0; |
| 1044 | else { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1045 | /* EOF or error, but can't even print error message. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1046 | quit_pending = 1; |
| 1047 | return; |
| 1048 | } |
| 1049 | } |
| 1050 | /* Consume printed characters from the buffer. */ |
| 1051 | buffer_consume(&stderr_buffer, len); |
Ben Lindstrom | a370005 | 2001-04-05 23:26:32 +0000 | [diff] [blame] | 1052 | stderr_bytes += len; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1053 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1054 | } |
| 1055 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1056 | /* |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1057 | * Get packets from the connection input buffer, and process them as long as |
| 1058 | * there are packets available. |
| 1059 | * |
| 1060 | * Any unknown packets received during the actual |
| 1061 | * session cause the session to terminate. This is |
| 1062 | * intended to make debugging easier since no |
| 1063 | * confirmations are sent. Any compatible protocol |
| 1064 | * extensions must be negotiated during the |
| 1065 | * preparatory phase. |
| 1066 | */ |
| 1067 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1068 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 1069 | client_process_buffered_input_packets(void) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1070 | { |
Ben Lindstrom | f28f634 | 2001-04-04 02:03:04 +0000 | [diff] [blame] | 1071 | dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1072 | } |
| 1073 | |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 1074 | /* scan buf[] for '~' before sending data to the peer */ |
| 1075 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1076 | static int |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 1077 | simple_escape_filter(Channel *c, char *buf, int len) |
| 1078 | { |
| 1079 | /* XXX we assume c->extended is writeable */ |
| 1080 | return process_escapes(&c->input, &c->output, &c->extended, buf, len); |
| 1081 | } |
| 1082 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1083 | static void |
Ben Lindstrom | 4c3f77d | 2001-04-05 23:37:36 +0000 | [diff] [blame] | 1084 | client_channel_closed(int id, void *arg) |
| 1085 | { |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 1086 | channel_cancel_cleanup(id); |
Ben Lindstrom | 4c3f77d | 2001-04-05 23:37:36 +0000 | [diff] [blame] | 1087 | session_closed = 1; |
Darren Tucker | 9a2c4cd | 2003-09-22 21:16:05 +1000 | [diff] [blame] | 1088 | leave_raw_mode(); |
Ben Lindstrom | 4c3f77d | 2001-04-05 23:37:36 +0000 | [diff] [blame] | 1089 | } |
| 1090 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1091 | /* |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1092 | * Implements the interactive session with the server. This is called after |
| 1093 | * the user has been authenticated, and a command has been started on the |
Ben Lindstrom | 2b1f71b | 2001-06-05 20:32:21 +0000 | [diff] [blame] | 1094 | * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character |
| 1095 | * used as an escape character for terminating or suspending the session. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1096 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1097 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1098 | int |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 1099 | client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1100 | { |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 1101 | fd_set *readset = NULL, *writeset = NULL; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1102 | double start_time, total_time; |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 1103 | int max_fd = 0, max_fd2 = 0, len, rekeying = 0, nalloc = 0; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1104 | char buf[100]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1105 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1106 | debug("Entering interactive session."); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1107 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1108 | start_time = get_current_time(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1109 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1110 | /* Initialize variables. */ |
| 1111 | escape_pending = 0; |
| 1112 | last_was_cr = 1; |
| 1113 | exit_status = -1; |
| 1114 | stdin_eof = 0; |
| 1115 | buffer_high = 64 * 1024; |
| 1116 | connection_in = packet_get_connection_in(); |
| 1117 | connection_out = packet_get_connection_out(); |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 1118 | max_fd = MAX(connection_in, connection_out); |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1119 | if (control_fd != -1) |
| 1120 | max_fd = MAX(max_fd, control_fd); |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 1121 | |
| 1122 | if (!compat20) { |
Ben Lindstrom | 302ea6f | 2001-04-16 02:01:25 +0000 | [diff] [blame] | 1123 | /* enable nonblocking unless tty */ |
| 1124 | if (!isatty(fileno(stdin))) |
| 1125 | set_nonblock(fileno(stdin)); |
| 1126 | if (!isatty(fileno(stdout))) |
| 1127 | set_nonblock(fileno(stdout)); |
| 1128 | if (!isatty(fileno(stderr))) |
| 1129 | set_nonblock(fileno(stderr)); |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 1130 | max_fd = MAX(max_fd, fileno(stdin)); |
| 1131 | max_fd = MAX(max_fd, fileno(stdout)); |
| 1132 | max_fd = MAX(max_fd, fileno(stderr)); |
| 1133 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1134 | stdin_bytes = 0; |
| 1135 | stdout_bytes = 0; |
| 1136 | stderr_bytes = 0; |
| 1137 | quit_pending = 0; |
| 1138 | escape_char = escape_char_arg; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1139 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1140 | /* Initialize buffers. */ |
| 1141 | buffer_init(&stdin_buffer); |
| 1142 | buffer_init(&stdout_buffer); |
| 1143 | buffer_init(&stderr_buffer); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1144 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1145 | client_init_dispatch(); |
| 1146 | |
Ben Lindstrom | f49dbff | 2002-12-23 02:01:55 +0000 | [diff] [blame] | 1147 | /* |
| 1148 | * Set signal handlers, (e.g. to restore non-blocking mode) |
| 1149 | * but don't overwrite SIG_IGN, matches behaviour from rsh(1) |
| 1150 | */ |
| 1151 | if (signal(SIGINT, SIG_IGN) != SIG_IGN) |
| 1152 | signal(SIGINT, signal_handler); |
| 1153 | if (signal(SIGQUIT, SIG_IGN) != SIG_IGN) |
| 1154 | signal(SIGQUIT, signal_handler); |
| 1155 | if (signal(SIGTERM, SIG_IGN) != SIG_IGN) |
| 1156 | signal(SIGTERM, signal_handler); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1157 | if (have_pty) |
| 1158 | signal(SIGWINCH, window_change_handler); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1159 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1160 | if (have_pty) |
| 1161 | enter_raw_mode(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1162 | |
Ben Lindstrom | 5b82832 | 2001-02-09 01:34:36 +0000 | [diff] [blame] | 1163 | if (compat20) { |
| 1164 | session_ident = ssh2_chan_id; |
Ben Lindstrom | 2b1f71b | 2001-06-05 20:32:21 +0000 | [diff] [blame] | 1165 | if (escape_char != SSH_ESCAPECHAR_NONE) |
Ben Lindstrom | 5b82832 | 2001-02-09 01:34:36 +0000 | [diff] [blame] | 1166 | channel_register_filter(session_ident, |
| 1167 | simple_escape_filter); |
Ben Lindstrom | 4c3f77d | 2001-04-05 23:37:36 +0000 | [diff] [blame] | 1168 | if (session_ident != -1) |
| 1169 | channel_register_cleanup(session_ident, |
| 1170 | client_channel_closed); |
Ben Lindstrom | 5b82832 | 2001-02-09 01:34:36 +0000 | [diff] [blame] | 1171 | } else { |
| 1172 | /* Check if we should immediately send eof on stdin. */ |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1173 | client_check_initial_eof_on_stdin(); |
Ben Lindstrom | 5b82832 | 2001-02-09 01:34:36 +0000 | [diff] [blame] | 1174 | } |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 1175 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1176 | /* Main loop of the client for the interactive session mode. */ |
| 1177 | while (!quit_pending) { |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1178 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1179 | /* Process buffered packets sent by the server. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1180 | client_process_buffered_input_packets(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1181 | |
Ben Lindstrom | 4c3f77d | 2001-04-05 23:37:36 +0000 | [diff] [blame] | 1182 | if (compat20 && session_closed && !channel_still_open()) |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1183 | break; |
Ben Lindstrom | 4c3f77d | 2001-04-05 23:37:36 +0000 | [diff] [blame] | 1184 | |
| 1185 | rekeying = (xxx_kex != NULL && !xxx_kex->done); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1186 | |
Ben Lindstrom | be2cc43 | 2001-04-04 23:46:07 +0000 | [diff] [blame] | 1187 | if (rekeying) { |
| 1188 | debug("rekeying in progress"); |
| 1189 | } else { |
| 1190 | /* |
| 1191 | * Make packets of buffered stdin data, and buffer |
| 1192 | * them for sending to the server. |
| 1193 | */ |
| 1194 | if (!compat20) |
| 1195 | client_make_packets_from_stdin_data(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1196 | |
Ben Lindstrom | be2cc43 | 2001-04-04 23:46:07 +0000 | [diff] [blame] | 1197 | /* |
| 1198 | * Make packets from buffered channel data, and |
| 1199 | * enqueue them for sending to the server. |
| 1200 | */ |
| 1201 | if (packet_not_very_much_data_to_write()) |
| 1202 | channel_output_poll(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1203 | |
Ben Lindstrom | be2cc43 | 2001-04-04 23:46:07 +0000 | [diff] [blame] | 1204 | /* |
| 1205 | * Check if the window size has changed, and buffer a |
| 1206 | * message about it to the server if so. |
| 1207 | */ |
| 1208 | client_check_window_change(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1209 | |
Ben Lindstrom | be2cc43 | 2001-04-04 23:46:07 +0000 | [diff] [blame] | 1210 | if (quit_pending) |
| 1211 | break; |
| 1212 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1213 | /* |
| 1214 | * Wait until we have something to do (something becomes |
| 1215 | * available on one of the descriptors). |
| 1216 | */ |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 1217 | max_fd2 = max_fd; |
Ben Lindstrom | be2cc43 | 2001-04-04 23:46:07 +0000 | [diff] [blame] | 1218 | client_wait_until_can_do_something(&readset, &writeset, |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 1219 | &max_fd2, &nalloc, rekeying); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1220 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1221 | if (quit_pending) |
| 1222 | break; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1223 | |
Ben Lindstrom | be2cc43 | 2001-04-04 23:46:07 +0000 | [diff] [blame] | 1224 | /* Do channel operations unless rekeying in progress. */ |
| 1225 | if (!rekeying) { |
| 1226 | channel_after_select(readset, writeset); |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 1227 | if (need_rekeying || packet_need_rekeying()) { |
| 1228 | debug("need rekeying"); |
Ben Lindstrom | be2cc43 | 2001-04-04 23:46:07 +0000 | [diff] [blame] | 1229 | xxx_kex->done = 0; |
| 1230 | kex_send_kexinit(xxx_kex); |
| 1231 | need_rekeying = 0; |
| 1232 | } |
| 1233 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1234 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1235 | /* Buffer input from the connection. */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 1236 | client_process_net_input(readset); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1237 | |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1238 | /* Accept control connections. */ |
| 1239 | client_process_control(readset); |
| 1240 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1241 | if (quit_pending) |
| 1242 | break; |
| 1243 | |
| 1244 | if (!compat20) { |
| 1245 | /* Buffer data from stdin */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 1246 | client_process_input(readset); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1247 | /* |
| 1248 | * Process output to stdout and stderr. Output to |
| 1249 | * the connection is processed elsewhere (above). |
| 1250 | */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 1251 | client_process_output(writeset); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1252 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1253 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1254 | /* Send as much buffered packet data as possible to the sender. */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 1255 | if (FD_ISSET(connection_out, writeset)) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1256 | packet_write_poll(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1257 | } |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 1258 | if (readset) |
| 1259 | xfree(readset); |
| 1260 | if (writeset) |
| 1261 | xfree(writeset); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1262 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1263 | /* Terminate the session. */ |
| 1264 | |
| 1265 | /* Stop watching for window change. */ |
| 1266 | if (have_pty) |
| 1267 | signal(SIGWINCH, SIG_DFL); |
| 1268 | |
Ben Lindstrom | 601e436 | 2001-06-21 03:19:23 +0000 | [diff] [blame] | 1269 | channel_free_all(); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1270 | |
Ben Lindstrom | ec46e0b | 2001-06-09 01:27:31 +0000 | [diff] [blame] | 1271 | if (have_pty) |
| 1272 | leave_raw_mode(); |
Ben Lindstrom | c93e84c | 2001-05-12 00:08:37 +0000 | [diff] [blame] | 1273 | |
| 1274 | /* restore blocking io */ |
| 1275 | if (!isatty(fileno(stdin))) |
| 1276 | unset_nonblock(fileno(stdin)); |
| 1277 | if (!isatty(fileno(stdout))) |
| 1278 | unset_nonblock(fileno(stdout)); |
| 1279 | if (!isatty(fileno(stderr))) |
| 1280 | unset_nonblock(fileno(stderr)); |
| 1281 | |
Damien Miller | d696551 | 2003-12-17 16:31:53 +1100 | [diff] [blame] | 1282 | /* |
| 1283 | * If there was no shell or command requested, there will be no remote |
| 1284 | * exit status to be returned. In that case, clear error code if the |
| 1285 | * connection was deliberately terminated at this end. |
| 1286 | */ |
| 1287 | if (no_shell_flag && received_signal == SIGTERM) { |
| 1288 | received_signal = 0; |
| 1289 | exit_status = 0; |
| 1290 | } |
| 1291 | |
Darren Tucker | 9a2c4cd | 2003-09-22 21:16:05 +1000 | [diff] [blame] | 1292 | if (received_signal) |
Ben Lindstrom | f8f065b | 2001-12-06 17:52:16 +0000 | [diff] [blame] | 1293 | fatal("Killed by signal %d.", (int) received_signal); |
Ben Lindstrom | ec46e0b | 2001-06-09 01:27:31 +0000 | [diff] [blame] | 1294 | |
| 1295 | /* |
| 1296 | * In interactive mode (with pseudo tty) display a message indicating |
| 1297 | * that the connection has been closed. |
| 1298 | */ |
| 1299 | if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) { |
| 1300 | snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host); |
| 1301 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
| 1302 | } |
| 1303 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1304 | /* Output any buffered data for stdout. */ |
Ben Lindstrom | c93e84c | 2001-05-12 00:08:37 +0000 | [diff] [blame] | 1305 | while (buffer_len(&stdout_buffer) > 0) { |
| 1306 | len = write(fileno(stdout), buffer_ptr(&stdout_buffer), |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 1307 | buffer_len(&stdout_buffer)); |
Ben Lindstrom | c93e84c | 2001-05-12 00:08:37 +0000 | [diff] [blame] | 1308 | if (len <= 0) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1309 | error("Write failed flushing stdout buffer."); |
Ben Lindstrom | c93e84c | 2001-05-12 00:08:37 +0000 | [diff] [blame] | 1310 | break; |
| 1311 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1312 | buffer_consume(&stdout_buffer, len); |
Ben Lindstrom | a370005 | 2001-04-05 23:26:32 +0000 | [diff] [blame] | 1313 | stdout_bytes += len; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1314 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1315 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1316 | /* Output any buffered data for stderr. */ |
Ben Lindstrom | c93e84c | 2001-05-12 00:08:37 +0000 | [diff] [blame] | 1317 | while (buffer_len(&stderr_buffer) > 0) { |
| 1318 | len = write(fileno(stderr), buffer_ptr(&stderr_buffer), |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 1319 | buffer_len(&stderr_buffer)); |
Ben Lindstrom | c93e84c | 2001-05-12 00:08:37 +0000 | [diff] [blame] | 1320 | if (len <= 0) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1321 | error("Write failed flushing stderr buffer."); |
Ben Lindstrom | c93e84c | 2001-05-12 00:08:37 +0000 | [diff] [blame] | 1322 | break; |
| 1323 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1324 | buffer_consume(&stderr_buffer, len); |
Ben Lindstrom | a370005 | 2001-04-05 23:26:32 +0000 | [diff] [blame] | 1325 | stderr_bytes += len; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1326 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1327 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1328 | /* Clear and free any buffers. */ |
| 1329 | memset(buf, 0, sizeof(buf)); |
| 1330 | buffer_free(&stdin_buffer); |
| 1331 | buffer_free(&stdout_buffer); |
| 1332 | buffer_free(&stderr_buffer); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1333 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1334 | /* Report bytes transferred, and transfer rates. */ |
| 1335 | total_time = get_current_time() - start_time; |
| 1336 | debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds", |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 1337 | stdin_bytes, stdout_bytes, stderr_bytes, total_time); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1338 | if (total_time > 0) |
| 1339 | debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f", |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 1340 | stdin_bytes / total_time, stdout_bytes / total_time, |
| 1341 | stderr_bytes / total_time); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1342 | |
| 1343 | /* Return the exit status of the program. */ |
| 1344 | debug("Exit status %d", exit_status); |
| 1345 | return exit_status; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1346 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1347 | |
| 1348 | /*********/ |
| 1349 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1350 | static void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 1351 | client_input_stdout_data(int type, u_int32_t seq, void *ctxt) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1352 | { |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 1353 | u_int data_len; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1354 | char *data = packet_get_string(&data_len); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1355 | packet_check_eom(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1356 | buffer_append(&stdout_buffer, data, data_len); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1357 | memset(data, 0, data_len); |
| 1358 | xfree(data); |
| 1359 | } |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1360 | static void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 1361 | client_input_stderr_data(int type, u_int32_t seq, void *ctxt) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1362 | { |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 1363 | u_int data_len; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1364 | char *data = packet_get_string(&data_len); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1365 | packet_check_eom(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1366 | buffer_append(&stderr_buffer, data, data_len); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1367 | memset(data, 0, data_len); |
| 1368 | xfree(data); |
| 1369 | } |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1370 | static void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 1371 | client_input_exit_status(int type, u_int32_t seq, void *ctxt) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1372 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1373 | exit_status = packet_get_int(); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1374 | packet_check_eom(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1375 | /* Acknowledge the exit. */ |
| 1376 | packet_start(SSH_CMSG_EXIT_CONFIRMATION); |
| 1377 | packet_send(); |
| 1378 | /* |
| 1379 | * Must wait for packet to be sent since we are |
| 1380 | * exiting the loop. |
| 1381 | */ |
| 1382 | packet_write_wait(); |
| 1383 | /* Flag that we want to exit. */ |
| 1384 | quit_pending = 1; |
| 1385 | } |
Darren Tucker | 5dcdd21 | 2003-10-02 16:17:00 +1000 | [diff] [blame] | 1386 | static void |
| 1387 | client_input_agent_open(int type, u_int32_t seq, void *ctxt) |
| 1388 | { |
| 1389 | Channel *c = NULL; |
| 1390 | int remote_id, sock; |
| 1391 | |
| 1392 | /* Read the remote channel number from the message. */ |
| 1393 | remote_id = packet_get_int(); |
| 1394 | packet_check_eom(); |
| 1395 | |
| 1396 | /* |
| 1397 | * Get a connection to the local authentication agent (this may again |
| 1398 | * get forwarded). |
| 1399 | */ |
| 1400 | sock = ssh_get_authentication_socket(); |
| 1401 | |
| 1402 | /* |
| 1403 | * If we could not connect the agent, send an error message back to |
| 1404 | * the server. This should never happen unless the agent dies, |
| 1405 | * because authentication forwarding is only enabled if we have an |
| 1406 | * agent. |
| 1407 | */ |
| 1408 | if (sock >= 0) { |
| 1409 | c = channel_new("", SSH_CHANNEL_OPEN, sock, sock, |
| 1410 | -1, 0, 0, 0, "authentication agent connection", 1); |
| 1411 | c->remote_id = remote_id; |
| 1412 | c->force_drain = 1; |
| 1413 | } |
| 1414 | if (c == NULL) { |
| 1415 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
| 1416 | packet_put_int(remote_id); |
| 1417 | } else { |
| 1418 | /* Send a confirmation to the remote host. */ |
| 1419 | debug("Forwarding authentication connection."); |
| 1420 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); |
| 1421 | packet_put_int(remote_id); |
| 1422 | packet_put_int(c->self); |
| 1423 | } |
| 1424 | packet_send(); |
| 1425 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1426 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1427 | static Channel * |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1428 | client_request_forwarded_tcpip(const char *request_type, int rchan) |
| 1429 | { |
Ben Lindstrom | a962c2f | 2002-07-04 00:14:17 +0000 | [diff] [blame] | 1430 | Channel *c = NULL; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1431 | char *listen_address, *originator_address; |
| 1432 | int listen_port, originator_port; |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1433 | int sock; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1434 | |
| 1435 | /* Get rest of the packet */ |
| 1436 | listen_address = packet_get_string(NULL); |
| 1437 | listen_port = packet_get_int(); |
| 1438 | originator_address = packet_get_string(NULL); |
| 1439 | originator_port = packet_get_int(); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1440 | packet_check_eom(); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1441 | |
| 1442 | debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d", |
| 1443 | listen_address, listen_port, originator_address, originator_port); |
| 1444 | |
Ben Lindstrom | 173e646 | 2001-07-04 05:15:15 +0000 | [diff] [blame] | 1445 | sock = channel_connect_by_listen_address(listen_port); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1446 | if (sock < 0) { |
| 1447 | xfree(originator_address); |
| 1448 | xfree(listen_address); |
| 1449 | return NULL; |
| 1450 | } |
| 1451 | c = channel_new("forwarded-tcpip", |
| 1452 | SSH_CHANNEL_CONNECTING, sock, sock, -1, |
| 1453 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0, |
Damien Miller | b1ca8bb | 2003-05-14 13:45:42 +1000 | [diff] [blame] | 1454 | originator_address, 1); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1455 | xfree(originator_address); |
| 1456 | xfree(listen_address); |
| 1457 | return c; |
| 1458 | } |
| 1459 | |
Ben Lindstrom | a962c2f | 2002-07-04 00:14:17 +0000 | [diff] [blame] | 1460 | static Channel * |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1461 | client_request_x11(const char *request_type, int rchan) |
| 1462 | { |
| 1463 | Channel *c = NULL; |
| 1464 | char *originator; |
| 1465 | int originator_port; |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1466 | int sock; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1467 | |
| 1468 | if (!options.forward_x11) { |
| 1469 | error("Warning: ssh server tried X11 forwarding."); |
| 1470 | error("Warning: this is probably a break in attempt by a malicious server."); |
| 1471 | return NULL; |
| 1472 | } |
| 1473 | originator = packet_get_string(NULL); |
| 1474 | if (datafellows & SSH_BUG_X11FWD) { |
| 1475 | debug2("buggy server: x11 request w/o originator_port"); |
| 1476 | originator_port = 0; |
| 1477 | } else { |
| 1478 | originator_port = packet_get_int(); |
| 1479 | } |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1480 | packet_check_eom(); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1481 | /* XXX check permission */ |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 1482 | debug("client_request_x11: request from %s %d", originator, |
| 1483 | originator_port); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1484 | xfree(originator); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1485 | sock = x11_connect_display(); |
| 1486 | if (sock < 0) |
| 1487 | return NULL; |
| 1488 | c = channel_new("x11", |
| 1489 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, |
Damien Miller | b1ca8bb | 2003-05-14 13:45:42 +1000 | [diff] [blame] | 1490 | CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1); |
Ben Lindstrom | 944c4f0 | 2001-09-18 05:51:13 +0000 | [diff] [blame] | 1491 | c->force_drain = 1; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1492 | return c; |
| 1493 | } |
| 1494 | |
Ben Lindstrom | a962c2f | 2002-07-04 00:14:17 +0000 | [diff] [blame] | 1495 | static Channel * |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1496 | client_request_agent(const char *request_type, int rchan) |
| 1497 | { |
| 1498 | Channel *c = NULL; |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1499 | int sock; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1500 | |
| 1501 | if (!options.forward_agent) { |
| 1502 | error("Warning: ssh server tried agent forwarding."); |
| 1503 | error("Warning: this is probably a break in attempt by a malicious server."); |
| 1504 | return NULL; |
| 1505 | } |
| 1506 | sock = ssh_get_authentication_socket(); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1507 | if (sock < 0) |
| 1508 | return NULL; |
| 1509 | c = channel_new("authentication agent connection", |
| 1510 | SSH_CHANNEL_OPEN, sock, sock, -1, |
| 1511 | CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0, |
Damien Miller | b1ca8bb | 2003-05-14 13:45:42 +1000 | [diff] [blame] | 1512 | "authentication agent connection", 1); |
Ben Lindstrom | 944c4f0 | 2001-09-18 05:51:13 +0000 | [diff] [blame] | 1513 | c->force_drain = 1; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1514 | return c; |
| 1515 | } |
| 1516 | |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1517 | /* XXXX move to generic input handler */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1518 | static void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 1519 | client_input_channel_open(int type, u_int32_t seq, void *ctxt) |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1520 | { |
| 1521 | Channel *c = NULL; |
| 1522 | char *ctype; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1523 | int rchan; |
Ben Lindstrom | 4fed2be | 2002-06-25 23:17:36 +0000 | [diff] [blame] | 1524 | u_int rmaxpack, rwindow, len; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1525 | |
| 1526 | ctype = packet_get_string(&len); |
| 1527 | rchan = packet_get_int(); |
| 1528 | rwindow = packet_get_int(); |
| 1529 | rmaxpack = packet_get_int(); |
| 1530 | |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 1531 | debug("client_input_channel_open: ctype %s rchan %d win %d max %d", |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1532 | ctype, rchan, rwindow, rmaxpack); |
| 1533 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1534 | if (strcmp(ctype, "forwarded-tcpip") == 0) { |
| 1535 | c = client_request_forwarded_tcpip(ctype, rchan); |
| 1536 | } else if (strcmp(ctype, "x11") == 0) { |
| 1537 | c = client_request_x11(ctype, rchan); |
| 1538 | } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) { |
| 1539 | c = client_request_agent(ctype, rchan); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1540 | } |
| 1541 | /* XXX duplicate : */ |
| 1542 | if (c != NULL) { |
| 1543 | debug("confirm %s", ctype); |
| 1544 | c->remote_id = rchan; |
| 1545 | c->remote_window = rwindow; |
| 1546 | c->remote_maxpacket = rmaxpack; |
Ben Lindstrom | a69d89b | 2001-05-09 00:01:18 +0000 | [diff] [blame] | 1547 | if (c->type != SSH_CHANNEL_CONNECTING) { |
| 1548 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); |
| 1549 | packet_put_int(c->remote_id); |
| 1550 | packet_put_int(c->self); |
| 1551 | packet_put_int(c->local_window); |
| 1552 | packet_put_int(c->local_maxpacket); |
| 1553 | packet_send(); |
| 1554 | } |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1555 | } else { |
| 1556 | debug("failure %s", ctype); |
| 1557 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); |
| 1558 | packet_put_int(rchan); |
| 1559 | packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED); |
Ben Lindstrom | f343674 | 2001-04-29 19:52:00 +0000 | [diff] [blame] | 1560 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
Ben Lindstrom | a69d89b | 2001-05-09 00:01:18 +0000 | [diff] [blame] | 1561 | packet_put_cstring("open failed"); |
Ben Lindstrom | f343674 | 2001-04-29 19:52:00 +0000 | [diff] [blame] | 1562 | packet_put_cstring(""); |
| 1563 | } |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1564 | packet_send(); |
| 1565 | } |
| 1566 | xfree(ctype); |
| 1567 | } |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1568 | static void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 1569 | client_input_channel_req(int type, u_int32_t seq, void *ctxt) |
Ben Lindstrom | 5b82832 | 2001-02-09 01:34:36 +0000 | [diff] [blame] | 1570 | { |
| 1571 | Channel *c = NULL; |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1572 | int exitval, id, reply, success = 0; |
Ben Lindstrom | 5b82832 | 2001-02-09 01:34:36 +0000 | [diff] [blame] | 1573 | char *rtype; |
| 1574 | |
| 1575 | id = packet_get_int(); |
| 1576 | rtype = packet_get_string(NULL); |
| 1577 | reply = packet_get_char(); |
| 1578 | |
| 1579 | debug("client_input_channel_req: channel %d rtype %s reply %d", |
| 1580 | id, rtype, reply); |
| 1581 | |
Ben Lindstrom | 5b82832 | 2001-02-09 01:34:36 +0000 | [diff] [blame] | 1582 | c = channel_lookup(id); |
| 1583 | if (c == NULL) { |
| 1584 | error("client_input_channel_req: channel %d: unknown channel", id); |
| 1585 | } else if (strcmp(rtype, "exit-status") == 0) { |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1586 | exitval = packet_get_int(); |
| 1587 | if (id == session_ident) { |
| 1588 | success = 1; |
| 1589 | exit_status = exitval; |
| 1590 | } else if (c->ctl_fd == -1) { |
| 1591 | error("client_input_channel_req: unexpected channel %d", |
| 1592 | session_ident); |
| 1593 | } else { |
| 1594 | atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval)); |
| 1595 | success = 1; |
| 1596 | } |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1597 | packet_check_eom(); |
Ben Lindstrom | 5b82832 | 2001-02-09 01:34:36 +0000 | [diff] [blame] | 1598 | } |
| 1599 | if (reply) { |
| 1600 | packet_start(success ? |
| 1601 | SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); |
| 1602 | packet_put_int(c->remote_id); |
| 1603 | packet_send(); |
| 1604 | } |
| 1605 | xfree(rtype); |
| 1606 | } |
Damien Miller | c3fa407 | 2002-01-22 23:21:58 +1100 | [diff] [blame] | 1607 | static void |
| 1608 | client_input_global_request(int type, u_int32_t seq, void *ctxt) |
| 1609 | { |
| 1610 | char *rtype; |
| 1611 | int want_reply; |
| 1612 | int success = 0; |
| 1613 | |
| 1614 | rtype = packet_get_string(NULL); |
| 1615 | want_reply = packet_get_char(); |
Damien Miller | 509b010 | 2003-12-17 16:33:10 +1100 | [diff] [blame] | 1616 | debug("client_input_global_request: rtype %s want_reply %d", |
| 1617 | rtype, want_reply); |
Damien Miller | c3fa407 | 2002-01-22 23:21:58 +1100 | [diff] [blame] | 1618 | if (want_reply) { |
| 1619 | packet_start(success ? |
| 1620 | SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE); |
| 1621 | packet_send(); |
| 1622 | packet_write_wait(); |
| 1623 | } |
| 1624 | xfree(rtype); |
| 1625 | } |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1626 | |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1627 | void |
| 1628 | client_session2_setup(int id, int want_tty, int want_subsystem, |
| 1629 | const char *term, struct termios *tiop, int in_fd, Buffer *cmd, |
| 1630 | dispatch_fn *subsys_repl) |
| 1631 | { |
| 1632 | int len; |
| 1633 | |
| 1634 | debug2("%s: id %d", __func__, id); |
| 1635 | |
| 1636 | if (want_tty) { |
| 1637 | struct winsize ws; |
| 1638 | struct termios tio; |
| 1639 | |
| 1640 | /* Store window size in the packet. */ |
| 1641 | if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0) |
| 1642 | memset(&ws, 0, sizeof(ws)); |
| 1643 | |
| 1644 | channel_request_start(id, "pty-req", 0); |
| 1645 | packet_put_cstring(term != NULL ? term : ""); |
| 1646 | packet_put_int(ws.ws_col); |
| 1647 | packet_put_int(ws.ws_row); |
| 1648 | packet_put_int(ws.ws_xpixel); |
| 1649 | packet_put_int(ws.ws_ypixel); |
| 1650 | tio = get_saved_tio(); |
| 1651 | tty_make_modes(-1, tiop != NULL ? tiop : &tio); |
| 1652 | packet_send(); |
| 1653 | /* XXX wait for reply */ |
| 1654 | } |
| 1655 | |
| 1656 | /* Transfer any environment variables from client to server */ |
| 1657 | if (options.num_send_env != 0) { |
| 1658 | int i, j, matched; |
| 1659 | extern char **environ; |
| 1660 | char *name, *val; |
| 1661 | |
| 1662 | debug("Sending environment."); |
| 1663 | for (i = 0; environ && environ[i] != NULL; i++) { |
| 1664 | /* Split */ |
| 1665 | name = xstrdup(environ[i]); |
| 1666 | if ((val = strchr(name, '=')) == NULL) { |
| 1667 | free(name); |
| 1668 | continue; |
| 1669 | } |
| 1670 | *val++ = '\0'; |
| 1671 | |
| 1672 | matched = 0; |
| 1673 | for (j = 0; j < options.num_send_env; j++) { |
| 1674 | if (match_pattern(name, options.send_env[j])) { |
| 1675 | matched = 1; |
| 1676 | break; |
| 1677 | } |
| 1678 | } |
| 1679 | if (!matched) { |
| 1680 | debug3("Ignored env %s", name); |
| 1681 | free(name); |
| 1682 | continue; |
| 1683 | } |
| 1684 | |
| 1685 | debug("Sending env %s = %s", name, val); |
| 1686 | channel_request_start(id, "env", 0); |
| 1687 | packet_put_cstring(name); |
| 1688 | packet_put_cstring(val); |
| 1689 | packet_send(); |
| 1690 | free(name); |
| 1691 | } |
| 1692 | } |
| 1693 | |
| 1694 | len = buffer_len(cmd); |
| 1695 | if (len > 0) { |
| 1696 | if (len > 900) |
| 1697 | len = 900; |
| 1698 | if (want_subsystem) { |
| 1699 | debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd)); |
| 1700 | channel_request_start(id, "subsystem", subsys_repl != NULL); |
| 1701 | if (subsys_repl != NULL) { |
| 1702 | /* register callback for reply */ |
| 1703 | /* XXX we assume that client_loop has already been called */ |
| 1704 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl); |
| 1705 | dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl); |
| 1706 | } |
| 1707 | } else { |
| 1708 | debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd)); |
| 1709 | channel_request_start(id, "exec", 0); |
| 1710 | } |
| 1711 | packet_put_string(buffer_ptr(cmd), buffer_len(cmd)); |
| 1712 | packet_send(); |
| 1713 | } else { |
| 1714 | channel_request_start(id, "shell", 0); |
| 1715 | packet_send(); |
| 1716 | } |
| 1717 | } |
| 1718 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1719 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 1720 | client_init_dispatch_20(void) |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1721 | { |
Ben Lindstrom | 8ac9106 | 2001-04-04 17:57:54 +0000 | [diff] [blame] | 1722 | dispatch_init(&dispatch_protocol_error); |
Damien Miller | 2797f7f | 2002-04-23 21:09:44 +1000 | [diff] [blame] | 1723 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1724 | dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose); |
| 1725 | dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data); |
| 1726 | dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof); |
| 1727 | dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1728 | dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1729 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
| 1730 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); |
Ben Lindstrom | 5b82832 | 2001-02-09 01:34:36 +0000 | [diff] [blame] | 1731 | dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1732 | dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); |
Damien Miller | c3fa407 | 2002-01-22 23:21:58 +1100 | [diff] [blame] | 1733 | dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request); |
Ben Lindstrom | 8ac9106 | 2001-04-04 17:57:54 +0000 | [diff] [blame] | 1734 | |
| 1735 | /* rekeying */ |
| 1736 | dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit); |
Damien Miller | 2797f7f | 2002-04-23 21:09:44 +1000 | [diff] [blame] | 1737 | |
| 1738 | /* global request reply messages */ |
| 1739 | dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply); |
| 1740 | dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1741 | } |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1742 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 1743 | client_init_dispatch_13(void) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1744 | { |
| 1745 | dispatch_init(NULL); |
| 1746 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); |
| 1747 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation); |
| 1748 | dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1749 | dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
| 1750 | dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); |
| 1751 | dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1752 | dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status); |
| 1753 | dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data); |
| 1754 | dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data); |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 1755 | |
| 1756 | dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ? |
Darren Tucker | 5dcdd21 | 2003-10-02 16:17:00 +1000 | [diff] [blame] | 1757 | &client_input_agent_open : &deny_input_open); |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 1758 | dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ? |
| 1759 | &x11_input_open : &deny_input_open); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1760 | } |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1761 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 1762 | client_init_dispatch_15(void) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1763 | { |
| 1764 | client_init_dispatch_13(); |
| 1765 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); |
| 1766 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose); |
| 1767 | } |
Ben Lindstrom | db47f38 | 2001-07-04 05:10:27 +0000 | [diff] [blame] | 1768 | static void |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 1769 | client_init_dispatch(void) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1770 | { |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1771 | if (compat20) |
| 1772 | client_init_dispatch_20(); |
| 1773 | else if (compat13) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1774 | client_init_dispatch_13(); |
| 1775 | else |
| 1776 | client_init_dispatch_15(); |
| 1777 | } |
Darren Tucker | 9a2c4cd | 2003-09-22 21:16:05 +1000 | [diff] [blame] | 1778 | |
| 1779 | /* client specific fatal cleanup */ |
| 1780 | void |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 1781 | cleanup_exit(int i) |
Darren Tucker | 9a2c4cd | 2003-09-22 21:16:05 +1000 | [diff] [blame] | 1782 | { |
Darren Tucker | 9a2c4cd | 2003-09-22 21:16:05 +1000 | [diff] [blame] | 1783 | leave_raw_mode(); |
| 1784 | leave_non_blocking(); |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1785 | if (options.control_path != NULL && control_fd != -1) |
| 1786 | unlink(options.control_path); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 1787 | _exit(i); |
Darren Tucker | 9a2c4cd | 2003-09-22 21:16:05 +1000 | [diff] [blame] | 1788 | } |