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 | * |
| 3 | * clientloop.c |
| 4 | * |
| 5 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
| 6 | * |
| 7 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 8 | * All rights reserved |
| 9 | * |
| 10 | * |
| 11 | * Created: Sat Sep 23 12:23:57 1995 ylo |
| 12 | * |
| 13 | * The main loop for the interactive session (client side). |
| 14 | * |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 15 | * SSH2 support added by Markus Friedl. |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 16 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 17 | |
| 18 | #include "includes.h" |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame^] | 19 | RCSID("$Id: clientloop.c,v 1.10 2000/04/12 10:17:39 damien Exp $"); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 20 | |
| 21 | #include "xmalloc.h" |
| 22 | #include "ssh.h" |
| 23 | #include "packet.h" |
| 24 | #include "buffer.h" |
| 25 | #include "authfd.h" |
Damien Miller | 5ce662a | 1999-11-11 17:57:39 +1100 | [diff] [blame] | 26 | #include "readconf.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 27 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 28 | #include "ssh2.h" |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 29 | #include "compat.h" |
| 30 | #include "channels.h" |
| 31 | #include "dispatch.h" |
| 32 | |
| 33 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 34 | /* Flag indicating that stdin should be redirected from /dev/null. */ |
| 35 | extern int stdin_null_flag; |
| 36 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 37 | /* |
| 38 | * Name of the host we are connecting to. This is the name given on the |
| 39 | * command line, or the HostName specified for the user-supplied name in a |
| 40 | * configuration file. |
| 41 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 42 | extern char *host; |
| 43 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 44 | /* |
| 45 | * Flag to indicate that we have received a window change signal which has |
| 46 | * not yet been processed. This will cause a message indicating the new |
| 47 | * window size to be sent to the server a little later. This is volatile |
| 48 | * because this is updated in a signal handler. |
| 49 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 50 | static volatile int received_window_change_signal = 0; |
| 51 | |
| 52 | /* Terminal modes, as saved by enter_raw_mode. */ |
| 53 | static struct termios saved_tio; |
| 54 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 55 | /* |
| 56 | * Flag indicating whether we are in raw mode. This is used by |
| 57 | * enter_raw_mode and leave_raw_mode. |
| 58 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 59 | static int in_raw_mode = 0; |
| 60 | |
| 61 | /* Flag indicating whether the user\'s terminal is in non-blocking mode. */ |
| 62 | static int in_non_blocking_mode = 0; |
| 63 | |
| 64 | /* Common data for the client loop code. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 65 | static int escape_pending; /* Last character was the escape character */ |
| 66 | static int last_was_cr; /* Last character was a newline. */ |
| 67 | static int exit_status; /* Used to store the exit status of the command. */ |
| 68 | static int stdin_eof; /* EOF has been encountered on standard error. */ |
| 69 | static Buffer stdin_buffer; /* Buffer for stdin data. */ |
| 70 | static Buffer stdout_buffer; /* Buffer for stdout data. */ |
| 71 | static Buffer stderr_buffer; /* Buffer for stderr data. */ |
| 72 | static unsigned int buffer_high;/* Soft max buffer size. */ |
| 73 | static int max_fd; /* Maximum file descriptor number in select(). */ |
| 74 | static int connection_in; /* Connection to server (input). */ |
| 75 | static int connection_out; /* Connection to server (output). */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 76 | static unsigned long stdin_bytes, stdout_bytes, stderr_bytes; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 77 | static int quit_pending; /* Set to non-zero to quit the client loop. */ |
| 78 | static int escape_char; /* Escape character. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 79 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 80 | |
| 81 | void client_init_dispatch(void); |
| 82 | int session_ident = -1; |
| 83 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 84 | /* Returns the user\'s terminal to normal mode if it had been put in raw mode. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 85 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 86 | void |
| 87 | leave_raw_mode() |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 88 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 89 | if (!in_raw_mode) |
| 90 | return; |
| 91 | in_raw_mode = 0; |
| 92 | if (tcsetattr(fileno(stdin), TCSADRAIN, &saved_tio) < 0) |
| 93 | perror("tcsetattr"); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 94 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 95 | fatal_remove_cleanup((void (*) (void *)) leave_raw_mode, NULL); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 96 | } |
| 97 | |
| 98 | /* Puts the user\'s terminal in raw mode. */ |
| 99 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 100 | void |
| 101 | enter_raw_mode() |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 102 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 103 | struct termios tio; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 104 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 105 | if (tcgetattr(fileno(stdin), &tio) < 0) |
| 106 | perror("tcgetattr"); |
| 107 | saved_tio = tio; |
| 108 | tio.c_iflag |= IGNPAR; |
| 109 | tio.c_iflag &= ~(ISTRIP | INLCR | IGNCR | ICRNL | IXON | IXANY | IXOFF); |
| 110 | tio.c_lflag &= ~(ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHONL); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 111 | #ifdef IEXTEN |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 112 | tio.c_lflag &= ~IEXTEN; |
| 113 | #endif /* IEXTEN */ |
| 114 | tio.c_oflag &= ~OPOST; |
| 115 | tio.c_cc[VMIN] = 1; |
| 116 | tio.c_cc[VTIME] = 0; |
| 117 | if (tcsetattr(fileno(stdin), TCSADRAIN, &tio) < 0) |
| 118 | perror("tcsetattr"); |
| 119 | in_raw_mode = 1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 120 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 121 | fatal_add_cleanup((void (*) (void *)) leave_raw_mode, NULL); |
| 122 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 123 | |
| 124 | /* Restores stdin to blocking mode. */ |
| 125 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 126 | void |
| 127 | leave_non_blocking() |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 128 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 129 | if (in_non_blocking_mode) { |
| 130 | (void) fcntl(fileno(stdin), F_SETFL, 0); |
| 131 | in_non_blocking_mode = 0; |
| 132 | fatal_remove_cleanup((void (*) (void *)) leave_non_blocking, NULL); |
| 133 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 134 | } |
| 135 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 136 | /* Puts stdin terminal in non-blocking mode. */ |
| 137 | |
| 138 | void |
| 139 | enter_non_blocking() |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 140 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 141 | in_non_blocking_mode = 1; |
| 142 | (void) fcntl(fileno(stdin), F_SETFL, O_NONBLOCK); |
| 143 | fatal_add_cleanup((void (*) (void *)) leave_non_blocking, NULL); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 144 | } |
| 145 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 146 | /* |
| 147 | * Signal handler for the window change signal (SIGWINCH). This just sets a |
| 148 | * flag indicating that the window has changed. |
| 149 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 150 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 151 | void |
| 152 | window_change_handler(int sig) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 153 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 154 | received_window_change_signal = 1; |
| 155 | signal(SIGWINCH, window_change_handler); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 156 | } |
| 157 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 158 | /* |
| 159 | * Signal handler for signals that cause the program to terminate. These |
| 160 | * signals must be trapped to restore terminal modes. |
| 161 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 162 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 163 | void |
| 164 | signal_handler(int sig) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 165 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 166 | if (in_raw_mode) |
| 167 | leave_raw_mode(); |
| 168 | if (in_non_blocking_mode) |
| 169 | leave_non_blocking(); |
| 170 | channel_stop_listening(); |
| 171 | packet_close(); |
| 172 | fatal("Killed by signal %d.", sig); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 173 | } |
| 174 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 175 | /* |
| 176 | * Returns current time in seconds from Jan 1, 1970 with the maximum |
| 177 | * available resolution. |
| 178 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 179 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 180 | double |
| 181 | get_current_time() |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 182 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 183 | struct timeval tv; |
| 184 | gettimeofday(&tv, NULL); |
| 185 | return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 186 | } |
| 187 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 188 | /* |
| 189 | * This is called when the interactive is entered. This checks if there is |
| 190 | * an EOF coming on stdin. We must check this explicitly, as select() does |
| 191 | * not appear to wake up when redirecting from /dev/null. |
| 192 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 193 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 194 | void |
| 195 | client_check_initial_eof_on_stdin() |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 196 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 197 | int len; |
| 198 | char buf[1]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 199 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 200 | /* |
| 201 | * If standard input is to be "redirected from /dev/null", we simply |
| 202 | * mark that we have seen an EOF and send an EOF message to the |
| 203 | * server. Otherwise, we try to read a single character; it appears |
| 204 | * that for some files, such /dev/null, select() never wakes up for |
| 205 | * read for this descriptor, which means that we never get EOF. This |
| 206 | * way we will get the EOF if stdin comes from /dev/null or similar. |
| 207 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 208 | if (stdin_null_flag) { |
| 209 | /* Fake EOF on stdin. */ |
| 210 | debug("Sending eof."); |
| 211 | stdin_eof = 1; |
| 212 | packet_start(SSH_CMSG_EOF); |
| 213 | packet_send(); |
| 214 | } else { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 215 | enter_non_blocking(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 216 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 217 | /* Check for immediate EOF on stdin. */ |
| 218 | len = read(fileno(stdin), buf, 1); |
| 219 | if (len == 0) { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 220 | /* EOF. Record that we have seen it and send EOF to server. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 221 | debug("Sending eof."); |
| 222 | stdin_eof = 1; |
| 223 | packet_start(SSH_CMSG_EOF); |
| 224 | packet_send(); |
| 225 | } else if (len > 0) { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 226 | /* |
| 227 | * Got data. We must store the data in the buffer, |
| 228 | * and also process it as an escape character if |
| 229 | * appropriate. |
| 230 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 231 | if ((unsigned char) buf[0] == escape_char) |
| 232 | escape_pending = 1; |
| 233 | else { |
| 234 | buffer_append(&stdin_buffer, buf, 1); |
| 235 | stdin_bytes += 1; |
| 236 | } |
| 237 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 238 | leave_non_blocking(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 239 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 240 | } |
| 241 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 242 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 243 | /* |
| 244 | * Make packets from buffered stdin data, and buffer them for sending to the |
| 245 | * connection. |
| 246 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 247 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 248 | void |
| 249 | client_make_packets_from_stdin_data() |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 250 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 251 | unsigned int len; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 252 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 253 | /* Send buffered stdin data to the server. */ |
| 254 | while (buffer_len(&stdin_buffer) > 0 && |
| 255 | packet_not_very_much_data_to_write()) { |
| 256 | len = buffer_len(&stdin_buffer); |
| 257 | /* Keep the packets at reasonable size. */ |
| 258 | if (len > packet_get_maxsize()) |
| 259 | len = packet_get_maxsize(); |
| 260 | packet_start(SSH_CMSG_STDIN_DATA); |
| 261 | packet_put_string(buffer_ptr(&stdin_buffer), len); |
| 262 | packet_send(); |
| 263 | buffer_consume(&stdin_buffer, len); |
| 264 | /* If we have a pending EOF, send it now. */ |
| 265 | if (stdin_eof && buffer_len(&stdin_buffer) == 0) { |
| 266 | packet_start(SSH_CMSG_EOF); |
| 267 | packet_send(); |
| 268 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 269 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 270 | } |
| 271 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 272 | /* |
| 273 | * Checks if the client window has changed, and sends a packet about it to |
| 274 | * the server if so. The actual change is detected elsewhere (by a software |
| 275 | * interrupt on Unix); this just checks the flag and sends a message if |
| 276 | * appropriate. |
| 277 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 278 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 279 | void |
| 280 | client_check_window_change() |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 281 | { |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 282 | struct winsize ws; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 283 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 284 | if (! received_window_change_signal) |
| 285 | return; |
| 286 | /** XXX race */ |
| 287 | received_window_change_signal = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 288 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 289 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) |
| 290 | return; |
| 291 | |
| 292 | debug("client_check_window_change: changed"); |
| 293 | |
| 294 | if (compat20) { |
| 295 | channel_request_start(session_ident, "window-change", 0); |
| 296 | packet_put_int(ws.ws_col); |
| 297 | packet_put_int(ws.ws_row); |
| 298 | packet_put_int(ws.ws_xpixel); |
| 299 | packet_put_int(ws.ws_ypixel); |
| 300 | packet_send(); |
| 301 | } else { |
| 302 | packet_start(SSH_CMSG_WINDOW_SIZE); |
| 303 | packet_put_int(ws.ws_row); |
| 304 | packet_put_int(ws.ws_col); |
| 305 | packet_put_int(ws.ws_xpixel); |
| 306 | packet_put_int(ws.ws_ypixel); |
| 307 | packet_send(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 308 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 309 | } |
| 310 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 311 | /* |
| 312 | * Waits until the client can do something (some data becomes available on |
| 313 | * one of the file descriptors). |
| 314 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 315 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 316 | void |
| 317 | client_wait_until_can_do_something(fd_set * readset, fd_set * writeset) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 318 | { |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 319 | /*debug("client_wait_until_can_do_something"); */ |
| 320 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 321 | /* Initialize select masks. */ |
| 322 | FD_ZERO(readset); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 323 | FD_ZERO(writeset); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 324 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 325 | if (!compat20) { |
| 326 | /* Read from the connection, unless our buffers are full. */ |
| 327 | if (buffer_len(&stdout_buffer) < buffer_high && |
| 328 | buffer_len(&stderr_buffer) < buffer_high && |
| 329 | channel_not_very_much_buffered_data()) |
| 330 | FD_SET(connection_in, readset); |
| 331 | /* |
| 332 | * Read from stdin, unless we have seen EOF or have very much |
| 333 | * buffered data to send to the server. |
| 334 | */ |
| 335 | if (!stdin_eof && packet_not_very_much_data_to_write()) |
| 336 | FD_SET(fileno(stdin), readset); |
| 337 | |
| 338 | /* Select stdout/stderr if have data in buffer. */ |
| 339 | if (buffer_len(&stdout_buffer) > 0) |
| 340 | FD_SET(fileno(stdout), writeset); |
| 341 | if (buffer_len(&stderr_buffer) > 0) |
| 342 | FD_SET(fileno(stderr), writeset); |
| 343 | } else { |
| 344 | FD_SET(connection_in, readset); |
| 345 | } |
| 346 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 347 | /* Add any selections by the channel mechanism. */ |
| 348 | channel_prepare_select(readset, writeset); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 349 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 350 | /* Select server connection if have data to write to the server. */ |
| 351 | if (packet_have_data_to_write()) |
| 352 | FD_SET(connection_out, writeset); |
| 353 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 354 | /* move UP XXX */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 355 | /* Update maximum file descriptor number, if appropriate. */ |
| 356 | if (channel_max_fd() > max_fd) |
| 357 | max_fd = channel_max_fd(); |
| 358 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 359 | /* |
| 360 | * Wait for something to happen. This will suspend the process until |
| 361 | * some selected descriptor can be read, written, or has some other |
| 362 | * event pending. Note: if you want to implement SSH_MSG_IGNORE |
| 363 | * messages to fool traffic analysis, this might be the place to do |
| 364 | * it: just have a random timeout for the select, and send a random |
| 365 | * SSH_MSG_IGNORE packet when the timeout expires. |
| 366 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 367 | |
| 368 | if (select(max_fd + 1, readset, writeset, NULL, NULL) < 0) { |
| 369 | char buf[100]; |
| 370 | /* Some systems fail to clear these automatically. */ |
| 371 | FD_ZERO(readset); |
| 372 | FD_ZERO(writeset); |
| 373 | if (errno == EINTR) |
| 374 | return; |
| 375 | /* Note: we might still have data in the buffers. */ |
| 376 | snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno)); |
| 377 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
| 378 | stderr_bytes += strlen(buf); |
| 379 | quit_pending = 1; |
| 380 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 381 | } |
| 382 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 383 | void |
| 384 | client_suspend_self() |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 385 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 386 | struct winsize oldws, newws; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 387 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 388 | /* Flush stdout and stderr buffers. */ |
| 389 | if (buffer_len(&stdout_buffer) > 0) |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 390 | atomicio(write, fileno(stdout), buffer_ptr(&stdout_buffer), |
| 391 | buffer_len(&stdout_buffer)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 392 | if (buffer_len(&stderr_buffer) > 0) |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 393 | atomicio(write, fileno(stderr), buffer_ptr(&stderr_buffer), |
| 394 | buffer_len(&stderr_buffer)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 395 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 396 | leave_raw_mode(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 397 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 398 | /* |
| 399 | * Free (and clear) the buffer to reduce the amount of data that gets |
| 400 | * written to swap. |
| 401 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 402 | buffer_free(&stdin_buffer); |
| 403 | buffer_free(&stdout_buffer); |
| 404 | buffer_free(&stderr_buffer); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 405 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 406 | /* Save old window size. */ |
| 407 | ioctl(fileno(stdin), TIOCGWINSZ, &oldws); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 408 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 409 | /* Send the suspend signal to the program itself. */ |
| 410 | kill(getpid(), SIGTSTP); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 411 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 412 | /* Check if the window size has changed. */ |
| 413 | if (ioctl(fileno(stdin), TIOCGWINSZ, &newws) >= 0 && |
| 414 | (oldws.ws_row != newws.ws_row || |
| 415 | oldws.ws_col != newws.ws_col || |
| 416 | oldws.ws_xpixel != newws.ws_xpixel || |
| 417 | oldws.ws_ypixel != newws.ws_ypixel)) |
| 418 | received_window_change_signal = 1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 419 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 420 | /* OK, we have been continued by the user. Reinitialize buffers. */ |
| 421 | buffer_init(&stdin_buffer); |
| 422 | buffer_init(&stdout_buffer); |
| 423 | buffer_init(&stderr_buffer); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 424 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 425 | enter_raw_mode(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 426 | } |
| 427 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 428 | void |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 429 | client_process_net_input(fd_set * readset) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 430 | { |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 431 | int len; |
| 432 | char buf[8192]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 433 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 434 | /* |
| 435 | * Read input from the server, and add any such data to the buffer of |
| 436 | * the packet subsystem. |
| 437 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 438 | if (FD_ISSET(connection_in, readset)) { |
| 439 | /* Read as much as possible. */ |
| 440 | len = read(connection_in, buf, sizeof(buf)); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 441 | /*debug("read connection_in len %d", len); XXX */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 442 | if (len == 0) { |
| 443 | /* Received EOF. The remote host has closed the connection. */ |
| 444 | snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n", |
| 445 | host); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 446 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
| 447 | stderr_bytes += strlen(buf); |
| 448 | quit_pending = 1; |
| 449 | return; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 450 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 451 | /* |
| 452 | * There is a kernel bug on Solaris that causes select to |
| 453 | * sometimes wake up even though there is no data available. |
| 454 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 455 | if (len < 0 && errno == EAGAIN) |
| 456 | len = 0; |
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 | if (len < 0) { |
| 459 | /* An error has encountered. Perhaps there is a network problem. */ |
| 460 | snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n", |
| 461 | host, strerror(errno)); |
| 462 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
| 463 | stderr_bytes += strlen(buf); |
| 464 | quit_pending = 1; |
| 465 | return; |
| 466 | } |
| 467 | packet_process_incoming(buf, len); |
| 468 | } |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 469 | } |
| 470 | |
| 471 | void |
| 472 | client_process_input(fd_set * readset) |
| 473 | { |
| 474 | int len, pid; |
| 475 | char buf[8192], *s; |
| 476 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 477 | /* Read input from stdin. */ |
| 478 | if (FD_ISSET(fileno(stdin), readset)) { |
| 479 | /* Read as much as possible. */ |
| 480 | len = read(fileno(stdin), buf, sizeof(buf)); |
| 481 | if (len <= 0) { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 482 | /* |
| 483 | * Received EOF or error. They are treated |
| 484 | * similarly, except that an error message is printed |
| 485 | * if it was an error condition. |
| 486 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 487 | if (len < 0) { |
| 488 | snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno)); |
| 489 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
| 490 | stderr_bytes += strlen(buf); |
| 491 | } |
| 492 | /* Mark that we have seen EOF. */ |
| 493 | stdin_eof = 1; |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 494 | /* |
| 495 | * Send an EOF message to the server unless there is |
| 496 | * data in the buffer. If there is data in the |
| 497 | * buffer, no message will be sent now. Code |
| 498 | * elsewhere will send the EOF when the buffer |
| 499 | * becomes empty if stdin_eof is set. |
| 500 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 501 | if (buffer_len(&stdin_buffer) == 0) { |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 502 | packet_start(SSH_CMSG_EOF); |
| 503 | packet_send(); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 504 | } |
| 505 | } else if (escape_char == -1) { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 506 | /* |
| 507 | * Normal successful read, and no escape character. |
| 508 | * Just append the data to buffer. |
| 509 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 510 | buffer_append(&stdin_buffer, buf, len); |
| 511 | stdin_bytes += len; |
| 512 | } else { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 513 | /* |
| 514 | * Normal, successful read. But we have an escape character |
| 515 | * and have to process the characters one by one. |
| 516 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 517 | unsigned int i; |
| 518 | for (i = 0; i < len; i++) { |
| 519 | unsigned char ch; |
| 520 | /* Get one character at a time. */ |
| 521 | ch = buf[i]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 522 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 523 | if (escape_pending) { |
| 524 | /* We have previously seen an escape character. */ |
| 525 | /* Clear the flag now. */ |
| 526 | escape_pending = 0; |
| 527 | /* Process the escaped character. */ |
| 528 | switch (ch) { |
| 529 | case '.': |
| 530 | /* Terminate the connection. */ |
| 531 | snprintf(buf, sizeof buf, "%c.\r\n", escape_char); |
| 532 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
| 533 | stderr_bytes += strlen(buf); |
| 534 | quit_pending = 1; |
| 535 | return; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 536 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 537 | case 'Z' - 64: |
| 538 | /* Suspend the program. */ |
| 539 | /* Print a message to that effect to the user. */ |
| 540 | snprintf(buf, sizeof buf, "%c^Z\r\n", escape_char); |
| 541 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
| 542 | stderr_bytes += strlen(buf); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 543 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 544 | /* Restore terminal modes and suspend. */ |
| 545 | client_suspend_self(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 546 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 547 | /* We have been continued. */ |
| 548 | continue; |
| 549 | |
| 550 | case '&': |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 551 | /* |
| 552 | * Detach the program (continue to serve connections, |
| 553 | * but put in background and no more new connections). |
| 554 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 555 | if (!stdin_eof) { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 556 | /* |
| 557 | * Sending SSH_CMSG_EOF alone does not always appear |
| 558 | * to be enough. So we try to send an EOF character |
| 559 | * first. |
| 560 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 561 | packet_start(SSH_CMSG_STDIN_DATA); |
| 562 | packet_put_string("\004", 1); |
| 563 | packet_send(); |
| 564 | /* Close stdin. */ |
| 565 | stdin_eof = 1; |
| 566 | if (buffer_len(&stdin_buffer) == 0) { |
| 567 | packet_start(SSH_CMSG_EOF); |
| 568 | packet_send(); |
| 569 | } |
| 570 | } |
| 571 | /* Restore tty modes. */ |
| 572 | leave_raw_mode(); |
| 573 | |
| 574 | /* Stop listening for new connections. */ |
| 575 | channel_stop_listening(); |
| 576 | |
| 577 | printf("%c& [backgrounded]\n", escape_char); |
| 578 | |
| 579 | /* Fork into background. */ |
| 580 | pid = fork(); |
| 581 | if (pid < 0) { |
| 582 | error("fork: %.100s", strerror(errno)); |
| 583 | continue; |
| 584 | } |
| 585 | if (pid != 0) { /* This is the parent. */ |
| 586 | /* The parent just exits. */ |
| 587 | exit(0); |
| 588 | } |
| 589 | /* The child continues serving connections. */ |
| 590 | continue; |
| 591 | |
| 592 | case '?': |
| 593 | snprintf(buf, sizeof buf, |
| 594 | "%c?\r\n\ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 595 | Supported escape sequences:\r\n\ |
| 596 | ~. - terminate connection\r\n\ |
| 597 | ~^Z - suspend ssh\r\n\ |
| 598 | ~# - list forwarded connections\r\n\ |
| 599 | ~& - background ssh (when waiting for connections to terminate)\r\n\ |
| 600 | ~? - this message\r\n\ |
| 601 | ~~ - send the escape character by typing it twice\r\n\ |
| 602 | (Note that escapes are only recognized immediately after newline.)\r\n", |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 603 | escape_char); |
| 604 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
| 605 | continue; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 606 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 607 | case '#': |
| 608 | snprintf(buf, sizeof buf, "%c#\r\n", escape_char); |
| 609 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
| 610 | s = channel_open_message(); |
| 611 | buffer_append(&stderr_buffer, s, strlen(s)); |
| 612 | xfree(s); |
| 613 | continue; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 614 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 615 | default: |
| 616 | if (ch != escape_char) { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 617 | /* |
| 618 | * Escape character followed by non-special character. |
| 619 | * Append both to the input buffer. |
| 620 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 621 | buf[0] = escape_char; |
| 622 | buf[1] = ch; |
| 623 | buffer_append(&stdin_buffer, buf, 2); |
| 624 | stdin_bytes += 2; |
| 625 | continue; |
| 626 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 627 | /* |
| 628 | * Note that escape character typed twice |
| 629 | * falls through here; the latter gets processed |
| 630 | * as a normal character below. |
| 631 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 632 | break; |
| 633 | } |
| 634 | } else { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 635 | /* |
| 636 | * The previous character was not an escape char. Check if this |
| 637 | * is an escape. |
| 638 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 639 | if (last_was_cr && ch == escape_char) { |
| 640 | /* It is. Set the flag and continue to next character. */ |
| 641 | escape_pending = 1; |
| 642 | continue; |
| 643 | } |
| 644 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 645 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 646 | /* |
| 647 | * Normal character. Record whether it was a newline, |
| 648 | * and append it to the buffer. |
| 649 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 650 | last_was_cr = (ch == '\r' || ch == '\n'); |
| 651 | buf[0] = ch; |
| 652 | buffer_append(&stdin_buffer, buf, 1); |
| 653 | stdin_bytes += 1; |
| 654 | continue; |
| 655 | } |
| 656 | } |
| 657 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 658 | } |
| 659 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 660 | void |
| 661 | client_process_output(fd_set * writeset) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 662 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 663 | int len; |
| 664 | char buf[100]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 665 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 666 | /* Write buffered output to stdout. */ |
| 667 | if (FD_ISSET(fileno(stdout), writeset)) { |
| 668 | /* Write as much data as possible. */ |
| 669 | len = write(fileno(stdout), buffer_ptr(&stdout_buffer), |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 670 | buffer_len(&stdout_buffer)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 671 | if (len <= 0) { |
| 672 | if (errno == EAGAIN) |
| 673 | len = 0; |
| 674 | else { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 675 | /* |
| 676 | * An error or EOF was encountered. Put an |
| 677 | * error message to stderr buffer. |
| 678 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 679 | snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno)); |
| 680 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
| 681 | stderr_bytes += strlen(buf); |
| 682 | quit_pending = 1; |
| 683 | return; |
| 684 | } |
| 685 | } |
| 686 | /* Consume printed data from the buffer. */ |
| 687 | buffer_consume(&stdout_buffer, len); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 688 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 689 | /* Write buffered output to stderr. */ |
| 690 | if (FD_ISSET(fileno(stderr), writeset)) { |
| 691 | /* Write as much data as possible. */ |
| 692 | len = write(fileno(stderr), buffer_ptr(&stderr_buffer), |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 693 | buffer_len(&stderr_buffer)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 694 | if (len <= 0) { |
| 695 | if (errno == EAGAIN) |
| 696 | len = 0; |
| 697 | else { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 698 | /* EOF or error, but can't even print error message. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 699 | quit_pending = 1; |
| 700 | return; |
| 701 | } |
| 702 | } |
| 703 | /* Consume printed characters from the buffer. */ |
| 704 | buffer_consume(&stderr_buffer, len); |
| 705 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 706 | } |
| 707 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 708 | /* |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 709 | * Get packets from the connection input buffer, and process them as long as |
| 710 | * there are packets available. |
| 711 | * |
| 712 | * Any unknown packets received during the actual |
| 713 | * session cause the session to terminate. This is |
| 714 | * intended to make debugging easier since no |
| 715 | * confirmations are sent. Any compatible protocol |
| 716 | * extensions must be negotiated during the |
| 717 | * preparatory phase. |
| 718 | */ |
| 719 | |
| 720 | void |
| 721 | client_process_buffered_input_packets() |
| 722 | { |
| 723 | dispatch_run(DISPATCH_NONBLOCK, &quit_pending); |
| 724 | } |
| 725 | |
| 726 | /* |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 727 | * Implements the interactive session with the server. This is called after |
| 728 | * the user has been authenticated, and a command has been started on the |
| 729 | * remote host. If escape_char != -1, it is the character used as an escape |
| 730 | * character for terminating or suspending the session. |
| 731 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 732 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 733 | int |
| 734 | client_loop(int have_pty, int escape_char_arg) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 735 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 736 | extern Options options; |
| 737 | double start_time, total_time; |
| 738 | int len; |
| 739 | char buf[100]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 740 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 741 | debug("Entering interactive session."); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 742 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 743 | start_time = get_current_time(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 744 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 745 | /* Initialize variables. */ |
| 746 | escape_pending = 0; |
| 747 | last_was_cr = 1; |
| 748 | exit_status = -1; |
| 749 | stdin_eof = 0; |
| 750 | buffer_high = 64 * 1024; |
| 751 | connection_in = packet_get_connection_in(); |
| 752 | connection_out = packet_get_connection_out(); |
| 753 | max_fd = connection_in; |
| 754 | if (connection_out > max_fd) |
| 755 | max_fd = connection_out; |
| 756 | stdin_bytes = 0; |
| 757 | stdout_bytes = 0; |
| 758 | stderr_bytes = 0; |
| 759 | quit_pending = 0; |
| 760 | escape_char = escape_char_arg; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 761 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 762 | /* Initialize buffers. */ |
| 763 | buffer_init(&stdin_buffer); |
| 764 | buffer_init(&stdout_buffer); |
| 765 | buffer_init(&stderr_buffer); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 766 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 767 | client_init_dispatch(); |
| 768 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 769 | /* Set signal handlers to restore non-blocking mode. */ |
| 770 | signal(SIGINT, signal_handler); |
| 771 | signal(SIGQUIT, signal_handler); |
| 772 | signal(SIGTERM, signal_handler); |
| 773 | signal(SIGPIPE, SIG_IGN); |
| 774 | if (have_pty) |
| 775 | signal(SIGWINCH, window_change_handler); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 776 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 777 | if (have_pty) |
| 778 | enter_raw_mode(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 779 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 780 | /* Check if we should immediately send of on stdin. */ |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 781 | if (!compat20) |
| 782 | client_check_initial_eof_on_stdin(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 783 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 784 | /* Main loop of the client for the interactive session mode. */ |
| 785 | while (!quit_pending) { |
| 786 | fd_set readset, writeset; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 787 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 788 | /* Process buffered packets sent by the server. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 789 | client_process_buffered_input_packets(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 790 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 791 | if (compat20 && !channel_still_open()) { |
| 792 | debug("!channel_still_open."); |
| 793 | break; |
| 794 | } |
| 795 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 796 | /* |
| 797 | * Make packets of buffered stdin data, and buffer them for |
| 798 | * sending to the server. |
| 799 | */ |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 800 | if (!compat20) |
| 801 | client_make_packets_from_stdin_data(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 802 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 803 | /* |
| 804 | * Make packets from buffered channel data, and buffer them |
| 805 | * for sending to the server. |
| 806 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 807 | if (packet_not_very_much_data_to_write()) |
| 808 | channel_output_poll(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 809 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 810 | /* |
| 811 | * Check if the window size has changed, and buffer a message |
| 812 | * about it to the server if so. |
| 813 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 814 | client_check_window_change(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 815 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 816 | if (quit_pending) |
| 817 | break; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 818 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 819 | /* |
| 820 | * Wait until we have something to do (something becomes |
| 821 | * available on one of the descriptors). |
| 822 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 823 | client_wait_until_can_do_something(&readset, &writeset); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 824 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 825 | if (quit_pending) |
| 826 | break; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 827 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 828 | /* Do channel operations. */ |
| 829 | channel_after_select(&readset, &writeset); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 830 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 831 | /* Buffer input from the connection. */ |
| 832 | client_process_net_input(&readset); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 833 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 834 | if (quit_pending) |
| 835 | break; |
| 836 | |
| 837 | if (!compat20) { |
| 838 | /* Buffer data from stdin */ |
| 839 | client_process_input(&readset); |
| 840 | /* |
| 841 | * Process output to stdout and stderr. Output to |
| 842 | * the connection is processed elsewhere (above). |
| 843 | */ |
| 844 | client_process_output(&writeset); |
| 845 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 846 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 847 | /* Send as much buffered packet data as possible to the sender. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 848 | if (FD_ISSET(connection_out, &writeset)) |
| 849 | packet_write_poll(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 850 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 851 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 852 | /* Terminate the session. */ |
| 853 | |
| 854 | /* Stop watching for window change. */ |
| 855 | if (have_pty) |
| 856 | signal(SIGWINCH, SIG_DFL); |
| 857 | |
| 858 | /* Stop listening for connections. */ |
| 859 | channel_stop_listening(); |
| 860 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 861 | /* |
| 862 | * In interactive mode (with pseudo tty) display a message indicating |
| 863 | * that the connection has been closed. |
| 864 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 865 | if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) { |
| 866 | snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host); |
| 867 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
| 868 | stderr_bytes += strlen(buf); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 869 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 870 | /* Output any buffered data for stdout. */ |
| 871 | while (buffer_len(&stdout_buffer) > 0) { |
| 872 | len = write(fileno(stdout), buffer_ptr(&stdout_buffer), |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 873 | buffer_len(&stdout_buffer)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 874 | if (len <= 0) { |
| 875 | error("Write failed flushing stdout buffer."); |
| 876 | break; |
| 877 | } |
| 878 | buffer_consume(&stdout_buffer, len); |
| 879 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 880 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 881 | /* Output any buffered data for stderr. */ |
| 882 | while (buffer_len(&stderr_buffer) > 0) { |
| 883 | len = write(fileno(stderr), buffer_ptr(&stderr_buffer), |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 884 | buffer_len(&stderr_buffer)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 885 | if (len <= 0) { |
| 886 | error("Write failed flushing stderr buffer."); |
| 887 | break; |
| 888 | } |
| 889 | buffer_consume(&stderr_buffer, len); |
| 890 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 891 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 892 | if (have_pty) |
| 893 | leave_raw_mode(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 894 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 895 | /* Clear and free any buffers. */ |
| 896 | memset(buf, 0, sizeof(buf)); |
| 897 | buffer_free(&stdin_buffer); |
| 898 | buffer_free(&stdout_buffer); |
| 899 | buffer_free(&stderr_buffer); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 900 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 901 | /* Report bytes transferred, and transfer rates. */ |
| 902 | total_time = get_current_time() - start_time; |
| 903 | debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds", |
| 904 | stdin_bytes, stdout_bytes, stderr_bytes, total_time); |
| 905 | if (total_time > 0) |
| 906 | debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f", |
| 907 | stdin_bytes / total_time, stdout_bytes / total_time, |
| 908 | stderr_bytes / total_time); |
| 909 | |
| 910 | /* Return the exit status of the program. */ |
| 911 | debug("Exit status %d", exit_status); |
| 912 | return exit_status; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 913 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 914 | |
| 915 | /*********/ |
| 916 | |
| 917 | void |
| 918 | client_input_stdout_data(int type, int plen) |
| 919 | { |
| 920 | unsigned int data_len; |
| 921 | char *data = packet_get_string(&data_len); |
| 922 | packet_integrity_check(plen, 4 + data_len, type); |
| 923 | buffer_append(&stdout_buffer, data, data_len); |
| 924 | stdout_bytes += data_len; |
| 925 | memset(data, 0, data_len); |
| 926 | xfree(data); |
| 927 | } |
| 928 | void |
| 929 | client_input_stderr_data(int type, int plen) |
| 930 | { |
| 931 | unsigned int data_len; |
| 932 | char *data = packet_get_string(&data_len); |
| 933 | packet_integrity_check(plen, 4 + data_len, type); |
| 934 | buffer_append(&stderr_buffer, data, data_len); |
| 935 | stdout_bytes += data_len; |
| 936 | memset(data, 0, data_len); |
| 937 | xfree(data); |
| 938 | } |
| 939 | void |
| 940 | client_input_exit_status(int type, int plen) |
| 941 | { |
| 942 | packet_integrity_check(plen, 4, type); |
| 943 | exit_status = packet_get_int(); |
| 944 | /* Acknowledge the exit. */ |
| 945 | packet_start(SSH_CMSG_EXIT_CONFIRMATION); |
| 946 | packet_send(); |
| 947 | /* |
| 948 | * Must wait for packet to be sent since we are |
| 949 | * exiting the loop. |
| 950 | */ |
| 951 | packet_write_wait(); |
| 952 | /* Flag that we want to exit. */ |
| 953 | quit_pending = 1; |
| 954 | } |
| 955 | |
| 956 | void |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 957 | client_init_dispatch_20() |
| 958 | { |
| 959 | dispatch_init(&dispatch_protocol_error); |
| 960 | dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose); |
| 961 | dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data); |
| 962 | dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof); |
| 963 | dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data); |
| 964 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
| 965 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); |
| 966 | dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &channel_input_channel_request); |
| 967 | dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); |
| 968 | } |
| 969 | void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 970 | client_init_dispatch_13() |
| 971 | { |
| 972 | dispatch_init(NULL); |
| 973 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); |
| 974 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation); |
| 975 | dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); |
| 976 | dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); |
| 977 | dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
| 978 | dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); |
| 979 | dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); |
| 980 | dispatch_set(SSH_SMSG_AGENT_OPEN, &auth_input_open_request); |
| 981 | dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status); |
| 982 | dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data); |
| 983 | dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data); |
| 984 | dispatch_set(SSH_SMSG_X11_OPEN, &x11_input_open); |
| 985 | } |
| 986 | void |
| 987 | client_init_dispatch_15() |
| 988 | { |
| 989 | client_init_dispatch_13(); |
| 990 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); |
| 991 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose); |
| 992 | } |
| 993 | void |
| 994 | client_init_dispatch() |
| 995 | { |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 996 | if (compat20) |
| 997 | client_init_dispatch_20(); |
| 998 | else if (compat13) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 999 | client_init_dispatch_13(); |
| 1000 | else |
| 1001 | client_init_dispatch_15(); |
| 1002 | } |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1003 | |
| 1004 | void |
| 1005 | client_input_channel_req(int id, void *arg) |
| 1006 | { |
| 1007 | Channel *c = NULL; |
| 1008 | unsigned int len; |
| 1009 | int success = 0; |
| 1010 | int reply; |
| 1011 | char *rtype; |
| 1012 | |
| 1013 | rtype = packet_get_string(&len); |
| 1014 | reply = packet_get_char(); |
| 1015 | |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame^] | 1016 | debug("session_input_channel_req: rtype %s reply %d", rtype, reply); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1017 | |
| 1018 | c = channel_lookup(id); |
| 1019 | if (c == NULL) |
| 1020 | fatal("session_input_channel_req: channel %d: bad channel", id); |
| 1021 | |
| 1022 | if (session_ident == -1) { |
| 1023 | error("client_input_channel_req: no channel %d", id); |
| 1024 | } else if (id != session_ident) { |
| 1025 | error("client_input_channel_req: bad channel %d != %d", |
| 1026 | id, session_ident); |
| 1027 | } else if (strcmp(rtype, "exit-status") == 0) { |
| 1028 | success = 1; |
| 1029 | exit_status = packet_get_int(); |
| 1030 | } |
| 1031 | if (reply) { |
| 1032 | packet_start(success ? |
| 1033 | SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); |
| 1034 | packet_put_int(c->remote_id); |
| 1035 | packet_send(); |
| 1036 | } |
| 1037 | xfree(rtype); |
| 1038 | } |
| 1039 | |
| 1040 | void |
| 1041 | client_set_session_ident(int id) |
| 1042 | { |
| 1043 | debug("client_set_session_ident: id %d", id); |
| 1044 | session_ident = id; |
| 1045 | channel_register_callback(id, SSH2_MSG_CHANNEL_REQUEST, |
| 1046 | client_input_channel_req, (void *)0); |
| 1047 | } |