| /* $OpenBSD: clientloop.c,v 1.246 2012/09/07 01:10:21 dtucker Exp $ */ |
| /* |
| * Author: Tatu Ylonen <ylo@cs.hut.fi> |
| * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| * All rights reserved |
| * The main loop for the interactive session (client side). |
| * |
| * As far as I am concerned, the code I have written for this software |
| * can be used freely for any purpose. Any derived versions of this |
| * software must be clearly marked as such, and if the derived work is |
| * incompatible with the protocol description in the RFC file, it must be |
| * called by a name other than "ssh" or "Secure Shell". |
| * |
| * |
| * Copyright (c) 1999 Theo de Raadt. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| * |
| * |
| * SSH2 support added by Markus Friedl. |
| * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "includes.h" |
| |
| #include <sys/types.h> |
| #include <sys/ioctl.h> |
| #include <sys/param.h> |
| #ifdef HAVE_SYS_STAT_H |
| # include <sys/stat.h> |
| #endif |
| #ifdef HAVE_SYS_TIME_H |
| # include <sys/time.h> |
| #endif |
| #include <sys/socket.h> |
| |
| #include <ctype.h> |
| #include <errno.h> |
| #ifdef HAVE_PATHS_H |
| #include <paths.h> |
| #endif |
| #include <signal.h> |
| #include <stdarg.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <termios.h> |
| #include <pwd.h> |
| #include <unistd.h> |
| |
| #include "openbsd-compat/sys-queue.h" |
| #include "xmalloc.h" |
| #include "ssh.h" |
| #include "ssh1.h" |
| #include "ssh2.h" |
| #include "packet.h" |
| #include "buffer.h" |
| #include "compat.h" |
| #include "channels.h" |
| #include "dispatch.h" |
| #include "key.h" |
| #include "cipher.h" |
| #include "kex.h" |
| #include "log.h" |
| #include "readconf.h" |
| #include "clientloop.h" |
| #include "sshconnect.h" |
| #include "authfd.h" |
| #include "atomicio.h" |
| #include "sshpty.h" |
| #include "misc.h" |
| #include "match.h" |
| #include "msg.h" |
| #include "roaming.h" |
| |
| /* import options */ |
| extern Options options; |
| |
| /* Flag indicating that stdin should be redirected from /dev/null. */ |
| extern int stdin_null_flag; |
| |
| /* Flag indicating that no shell has been requested */ |
| extern int no_shell_flag; |
| |
| /* Control socket */ |
| extern int muxserver_sock; /* XXX use mux_client_cleanup() instead */ |
| |
| /* |
| * Name of the host we are connecting to. This is the name given on the |
| * command line, or the HostName specified for the user-supplied name in a |
| * configuration file. |
| */ |
| extern char *host; |
| |
| /* |
| * Flag to indicate that we have received a window change signal which has |
| * not yet been processed. This will cause a message indicating the new |
| * window size to be sent to the server a little later. This is volatile |
| * because this is updated in a signal handler. |
| */ |
| static volatile sig_atomic_t received_window_change_signal = 0; |
| static volatile sig_atomic_t received_signal = 0; |
| |
| /* Flag indicating whether the user's terminal is in non-blocking mode. */ |
| static int in_non_blocking_mode = 0; |
| |
| /* Time when backgrounded control master using ControlPersist should exit */ |
| static time_t control_persist_exit_time = 0; |
| |
| /* Common data for the client loop code. */ |
| volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */ |
| static int escape_char1; /* Escape character. (proto1 only) */ |
| static int escape_pending1; /* Last character was an escape (proto1 only) */ |
| static int last_was_cr; /* Last character was a newline. */ |
| static int exit_status; /* Used to store the command exit status. */ |
| static int stdin_eof; /* EOF has been encountered on stderr. */ |
| static Buffer stdin_buffer; /* Buffer for stdin data. */ |
| static Buffer stdout_buffer; /* Buffer for stdout data. */ |
| static Buffer stderr_buffer; /* Buffer for stderr data. */ |
| static u_int buffer_high; /* Soft max buffer size. */ |
| static int connection_in; /* Connection to server (input). */ |
| static int connection_out; /* Connection to server (output). */ |
| static int need_rekeying; /* Set to non-zero if rekeying is requested. */ |
| static int session_closed; /* In SSH2: login session closed. */ |
| static int x11_refuse_time; /* If >0, refuse x11 opens after this time. */ |
| |
| static void client_init_dispatch(void); |
| int session_ident = -1; |
| |
| int session_resumed = 0; |
| |
| /* Track escape per proto2 channel */ |
| struct escape_filter_ctx { |
| int escape_pending; |
| int escape_char; |
| }; |
| |
| /* Context for channel confirmation replies */ |
| struct channel_reply_ctx { |
| const char *request_type; |
| int id; |
| enum confirm_action action; |
| }; |
| |
| /* Global request success/failure callbacks */ |
| struct global_confirm { |
| TAILQ_ENTRY(global_confirm) entry; |
| global_confirm_cb *cb; |
| void *ctx; |
| int ref_count; |
| }; |
| TAILQ_HEAD(global_confirms, global_confirm); |
| static struct global_confirms global_confirms = |
| TAILQ_HEAD_INITIALIZER(global_confirms); |
| |
| /*XXX*/ |
| extern Kex *xxx_kex; |
| |
| void ssh_process_session2_setup(int, int, int, Buffer *); |
| |
| /* Restores stdin to blocking mode. */ |
| |
| static void |
| leave_non_blocking(void) |
| { |
| if (in_non_blocking_mode) { |
| unset_nonblock(fileno(stdin)); |
| in_non_blocking_mode = 0; |
| } |
| } |
| |
| /* Puts stdin terminal in non-blocking mode. */ |
| |
| static void |
| enter_non_blocking(void) |
| { |
| in_non_blocking_mode = 1; |
| set_nonblock(fileno(stdin)); |
| } |
| |
| /* |
| * Signal handler for the window change signal (SIGWINCH). This just sets a |
| * flag indicating that the window has changed. |
| */ |
| /*ARGSUSED */ |
| static void |
| window_change_handler(int sig) |
| { |
| received_window_change_signal = 1; |
| signal(SIGWINCH, window_change_handler); |
| } |
| |
| /* |
| * Signal handler for signals that cause the program to terminate. These |
| * signals must be trapped to restore terminal modes. |
| */ |
| /*ARGSUSED */ |
| static void |
| signal_handler(int sig) |
| { |
| received_signal = sig; |
| quit_pending = 1; |
| } |
| |
| /* |
| * Returns current time in seconds from Jan 1, 1970 with the maximum |
| * available resolution. |
| */ |
| |
| static double |
| get_current_time(void) |
| { |
| struct timeval tv; |
| gettimeofday(&tv, NULL); |
| return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0; |
| } |
| |
| /* |
| * Sets control_persist_exit_time to the absolute time when the |
| * backgrounded control master should exit due to expiry of the |
| * ControlPersist timeout. Sets it to 0 if we are not a backgrounded |
| * control master process, or if there is no ControlPersist timeout. |
| */ |
| static void |
| set_control_persist_exit_time(void) |
| { |
| if (muxserver_sock == -1 || !options.control_persist |
| || options.control_persist_timeout == 0) { |
| /* not using a ControlPersist timeout */ |
| control_persist_exit_time = 0; |
| } else if (channel_still_open()) { |
| /* some client connections are still open */ |
| if (control_persist_exit_time > 0) |
| debug2("%s: cancel scheduled exit", __func__); |
| control_persist_exit_time = 0; |
| } else if (control_persist_exit_time <= 0) { |
| /* a client connection has recently closed */ |
| control_persist_exit_time = time(NULL) + |
| (time_t)options.control_persist_timeout; |
| debug2("%s: schedule exit in %d seconds", __func__, |
| options.control_persist_timeout); |
| } |
| /* else we are already counting down to the timeout */ |
| } |
| |
| #define SSH_X11_VALID_DISPLAY_CHARS ":/.-_" |
| static int |
| client_x11_display_valid(const char *display) |
| { |
| size_t i, dlen; |
| |
| dlen = strlen(display); |
| for (i = 0; i < dlen; i++) { |
| if (!isalnum(display[i]) && |
| strchr(SSH_X11_VALID_DISPLAY_CHARS, display[i]) == NULL) { |
| debug("Invalid character '%c' in DISPLAY", display[i]); |
| return 0; |
| } |
| } |
| return 1; |
| } |
| |
| #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1" |
| void |
| client_x11_get_proto(const char *display, const char *xauth_path, |
| u_int trusted, u_int timeout, char **_proto, char **_data) |
| { |
| char cmd[1024]; |
| char line[512]; |
| char xdisplay[512]; |
| static char proto[512], data[512]; |
| FILE *f; |
| int got_data = 0, generated = 0, do_unlink = 0, i; |
| char *xauthdir, *xauthfile; |
| struct stat st; |
| u_int now; |
| |
| xauthdir = xauthfile = NULL; |
| *_proto = proto; |
| *_data = data; |
| proto[0] = data[0] = '\0'; |
| |
| if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) { |
| debug("No xauth program."); |
| } else if (!client_x11_display_valid(display)) { |
| logit("DISPLAY '%s' invalid, falling back to fake xauth data", |
| display); |
| } else { |
| if (display == NULL) { |
| debug("x11_get_proto: DISPLAY not set"); |
| return; |
| } |
| /* |
| * Handle FamilyLocal case where $DISPLAY does |
| * not match an authorization entry. For this we |
| * just try "xauth list unix:displaynum.screennum". |
| * XXX: "localhost" match to determine FamilyLocal |
| * is not perfect. |
| */ |
| if (strncmp(display, "localhost:", 10) == 0) { |
| snprintf(xdisplay, sizeof(xdisplay), "unix:%s", |
| display + 10); |
| display = xdisplay; |
| } |
| if (trusted == 0) { |
| xauthdir = xmalloc(MAXPATHLEN); |
| xauthfile = xmalloc(MAXPATHLEN); |
| mktemp_proto(xauthdir, MAXPATHLEN); |
| if (mkdtemp(xauthdir) != NULL) { |
| do_unlink = 1; |
| snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile", |
| xauthdir); |
| snprintf(cmd, sizeof(cmd), |
| "%s -f %s generate %s " SSH_X11_PROTO |
| " untrusted timeout %u 2>" _PATH_DEVNULL, |
| xauth_path, xauthfile, display, timeout); |
| debug2("x11_get_proto: %s", cmd); |
| if (system(cmd) == 0) |
| generated = 1; |
| if (x11_refuse_time == 0) { |
| now = time(NULL) + 1; |
| if (UINT_MAX - timeout < now) |
| x11_refuse_time = UINT_MAX; |
| else |
| x11_refuse_time = now + timeout; |
| } |
| } |
| } |
| |
| /* |
| * When in untrusted mode, we read the cookie only if it was |
| * successfully generated as an untrusted one in the step |
| * above. |
| */ |
| if (trusted || generated) { |
| snprintf(cmd, sizeof(cmd), |
| "%s %s%s list %s 2>" _PATH_DEVNULL, |
| xauth_path, |
| generated ? "-f " : "" , |
| generated ? xauthfile : "", |
| display); |
| debug2("x11_get_proto: %s", cmd); |
| f = popen(cmd, "r"); |
| if (f && fgets(line, sizeof(line), f) && |
| sscanf(line, "%*s %511s %511s", proto, data) == 2) |
| got_data = 1; |
| if (f) |
| pclose(f); |
| } else |
| error("Warning: untrusted X11 forwarding setup failed: " |
| "xauth key data not generated"); |
| } |
| |
| if (do_unlink) { |
| unlink(xauthfile); |
| rmdir(xauthdir); |
| } |
| if (xauthdir) |
| xfree(xauthdir); |
| if (xauthfile) |
| xfree(xauthfile); |
| |
| /* |
| * If we didn't get authentication data, just make up some |
| * data. The forwarding code will check the validity of the |
| * response anyway, and substitute this data. The X11 |
| * server, however, will ignore this fake data and use |
| * whatever authentication mechanisms it was using otherwise |
| * for the local connection. |
| */ |
| if (!got_data) { |
| u_int32_t rnd = 0; |
| |
| logit("Warning: No xauth data; " |
| "using fake authentication data for X11 forwarding."); |
| strlcpy(proto, SSH_X11_PROTO, sizeof proto); |
| for (i = 0; i < 16; i++) { |
| if (i % 4 == 0) |
| rnd = arc4random(); |
| snprintf(data + 2 * i, sizeof data - 2 * i, "%02x", |
| rnd & 0xff); |
| rnd >>= 8; |
| } |
| } |
| } |
| |
| /* |
| * This is called when the interactive is entered. This checks if there is |
| * an EOF coming on stdin. We must check this explicitly, as select() does |
| * not appear to wake up when redirecting from /dev/null. |
| */ |
| |
| static void |
| client_check_initial_eof_on_stdin(void) |
| { |
| int len; |
| char buf[1]; |
| |
| /* |
| * If standard input is to be "redirected from /dev/null", we simply |
| * mark that we have seen an EOF and send an EOF message to the |
| * server. Otherwise, we try to read a single character; it appears |
| * that for some files, such /dev/null, select() never wakes up for |
| * read for this descriptor, which means that we never get EOF. This |
| * way we will get the EOF if stdin comes from /dev/null or similar. |
| */ |
| if (stdin_null_flag) { |
| /* Fake EOF on stdin. */ |
| debug("Sending eof."); |
| stdin_eof = 1; |
| packet_start(SSH_CMSG_EOF); |
| packet_send(); |
| } else { |
| enter_non_blocking(); |
| |
| /* Check for immediate EOF on stdin. */ |
| len = read(fileno(stdin), buf, 1); |
| if (len == 0) { |
| /* |
| * EOF. Record that we have seen it and send |
| * EOF to server. |
| */ |
| debug("Sending eof."); |
| stdin_eof = 1; |
| packet_start(SSH_CMSG_EOF); |
| packet_send(); |
| } else if (len > 0) { |
| /* |
| * Got data. We must store the data in the buffer, |
| * and also process it as an escape character if |
| * appropriate. |
| */ |
| if ((u_char) buf[0] == escape_char1) |
| escape_pending1 = 1; |
| else |
| buffer_append(&stdin_buffer, buf, 1); |
| } |
| leave_non_blocking(); |
| } |
| } |
| |
| |
| /* |
| * Make packets from buffered stdin data, and buffer them for sending to the |
| * connection. |
| */ |
| |
| static void |
| client_make_packets_from_stdin_data(void) |
| { |
| u_int len; |
| |
| /* Send buffered stdin data to the server. */ |
| while (buffer_len(&stdin_buffer) > 0 && |
| packet_not_very_much_data_to_write()) { |
| len = buffer_len(&stdin_buffer); |
| /* Keep the packets at reasonable size. */ |
| if (len > packet_get_maxsize()) |
| len = packet_get_maxsize(); |
| packet_start(SSH_CMSG_STDIN_DATA); |
| packet_put_string(buffer_ptr(&stdin_buffer), len); |
| packet_send(); |
| buffer_consume(&stdin_buffer, len); |
| /* If we have a pending EOF, send it now. */ |
| if (stdin_eof && buffer_len(&stdin_buffer) == 0) { |
| packet_start(SSH_CMSG_EOF); |
| packet_send(); |
| } |
| } |
| } |
| |
| /* |
| * Checks if the client window has changed, and sends a packet about it to |
| * the server if so. The actual change is detected elsewhere (by a software |
| * interrupt on Unix); this just checks the flag and sends a message if |
| * appropriate. |
| */ |
| |
| static void |
| client_check_window_change(void) |
| { |
| struct winsize ws; |
| |
| if (! received_window_change_signal) |
| return; |
| /** XXX race */ |
| received_window_change_signal = 0; |
| |
| debug2("client_check_window_change: changed"); |
| |
| if (compat20) { |
| channel_send_window_changes(); |
| } else { |
| if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) |
| return; |
| packet_start(SSH_CMSG_WINDOW_SIZE); |
| packet_put_int((u_int)ws.ws_row); |
| packet_put_int((u_int)ws.ws_col); |
| packet_put_int((u_int)ws.ws_xpixel); |
| packet_put_int((u_int)ws.ws_ypixel); |
| packet_send(); |
| } |
| } |
| |
| static void |
| client_global_request_reply(int type, u_int32_t seq, void *ctxt) |
| { |
| struct global_confirm *gc; |
| |
| if ((gc = TAILQ_FIRST(&global_confirms)) == NULL) |
| return; |
| if (gc->cb != NULL) |
| gc->cb(type, seq, gc->ctx); |
| if (--gc->ref_count <= 0) { |
| TAILQ_REMOVE(&global_confirms, gc, entry); |
| bzero(gc, sizeof(*gc)); |
| xfree(gc); |
| } |
| |
| packet_set_alive_timeouts(0); |
| } |
| |
| static void |
| server_alive_check(void) |
| { |
| if (packet_inc_alive_timeouts() > options.server_alive_count_max) { |
| logit("Timeout, server %s not responding.", host); |
| cleanup_exit(255); |
| } |
| packet_start(SSH2_MSG_GLOBAL_REQUEST); |
| packet_put_cstring("keepalive@openssh.com"); |
| packet_put_char(1); /* boolean: want reply */ |
| packet_send(); |
| /* Insert an empty placeholder to maintain ordering */ |
| client_register_global_confirm(NULL, NULL); |
| } |
| |
| /* |
| * Waits until the client can do something (some data becomes available on |
| * one of the file descriptors). |
| */ |
| static void |
| client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, |
| int *maxfdp, u_int *nallocp, int rekeying) |
| { |
| struct timeval tv, *tvp; |
| int timeout_secs; |
| time_t minwait_secs = 0; |
| int ret; |
| |
| /* Add any selections by the channel mechanism. */ |
| channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, |
| &minwait_secs, rekeying); |
| |
| if (!compat20) { |
| /* Read from the connection, unless our buffers are full. */ |
| if (buffer_len(&stdout_buffer) < buffer_high && |
| buffer_len(&stderr_buffer) < buffer_high && |
| channel_not_very_much_buffered_data()) |
| FD_SET(connection_in, *readsetp); |
| /* |
| * Read from stdin, unless we have seen EOF or have very much |
| * buffered data to send to the server. |
| */ |
| if (!stdin_eof && packet_not_very_much_data_to_write()) |
| FD_SET(fileno(stdin), *readsetp); |
| |
| /* Select stdout/stderr if have data in buffer. */ |
| if (buffer_len(&stdout_buffer) > 0) |
| FD_SET(fileno(stdout), *writesetp); |
| if (buffer_len(&stderr_buffer) > 0) |
| FD_SET(fileno(stderr), *writesetp); |
| } else { |
| /* channel_prepare_select could have closed the last channel */ |
| if (session_closed && !channel_still_open() && |
| !packet_have_data_to_write()) { |
| /* clear mask since we did not call select() */ |
| memset(*readsetp, 0, *nallocp); |
| memset(*writesetp, 0, *nallocp); |
| return; |
| } else { |
| FD_SET(connection_in, *readsetp); |
| } |
| } |
| |
| /* Select server connection if have data to write to the server. */ |
| if (packet_have_data_to_write()) |
| FD_SET(connection_out, *writesetp); |
| |
| /* |
| * Wait for something to happen. This will suspend the process until |
| * some selected descriptor can be read, written, or has some other |
| * event pending, or a timeout expires. |
| */ |
| |
| timeout_secs = INT_MAX; /* we use INT_MAX to mean no timeout */ |
| if (options.server_alive_interval > 0 && compat20) |
| timeout_secs = options.server_alive_interval; |
| set_control_persist_exit_time(); |
| if (control_persist_exit_time > 0) { |
| timeout_secs = MIN(timeout_secs, |
| control_persist_exit_time - time(NULL)); |
| if (timeout_secs < 0) |
| timeout_secs = 0; |
| } |
| if (minwait_secs != 0) |
| timeout_secs = MIN(timeout_secs, (int)minwait_secs); |
| if (timeout_secs == INT_MAX) |
| tvp = NULL; |
| else { |
| tv.tv_sec = timeout_secs; |
| tv.tv_usec = 0; |
| tvp = &tv; |
| } |
| |
| ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp); |
| if (ret < 0) { |
| char buf[100]; |
| |
| /* |
| * We have to clear the select masks, because we return. |
| * We have to return, because the mainloop checks for the flags |
| * set by the signal handlers. |
| */ |
| memset(*readsetp, 0, *nallocp); |
| memset(*writesetp, 0, *nallocp); |
| |
| if (errno == EINTR) |
| return; |
| /* Note: we might still have data in the buffers. */ |
| snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno)); |
| buffer_append(&stderr_buffer, buf, strlen(buf)); |
| quit_pending = 1; |
| } else if (ret == 0) |
| server_alive_check(); |
| } |
| |
| static void |
| client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr) |
| { |
| /* Flush stdout and stderr buffers. */ |
| if (buffer_len(bout) > 0) |
| atomicio(vwrite, fileno(stdout), buffer_ptr(bout), |
| buffer_len(bout)); |
| if (buffer_len(berr) > 0) |
| atomicio(vwrite, fileno(stderr), buffer_ptr(berr), |
| buffer_len(berr)); |
| |
| leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE); |
| |
| /* |
| * Free (and clear) the buffer to reduce the amount of data that gets |
| * written to swap. |
| */ |
| buffer_free(bin); |
| buffer_free(bout); |
| buffer_free(berr); |
| |
| /* Send the suspend signal to the program itself. */ |
| kill(getpid(), SIGTSTP); |
| |
| /* Reset window sizes in case they have changed */ |
| received_window_change_signal = 1; |
| |
| /* OK, we have been continued by the user. Reinitialize buffers. */ |
| buffer_init(bin); |
| buffer_init(bout); |
| buffer_init(berr); |
| |
| enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE); |
| } |
| |
| static void |
| client_process_net_input(fd_set *readset) |
| { |
| int len, cont = 0; |
| char buf[SSH_IOBUFSZ]; |
| |
| /* |
| * Read input from the server, and add any such data to the buffer of |
| * the packet subsystem. |
| */ |
| if (FD_ISSET(connection_in, readset)) { |
| /* Read as much as possible. */ |
| len = roaming_read(connection_in, buf, sizeof(buf), &cont); |
| if (len == 0 && cont == 0) { |
| /* |
| * Received EOF. The remote host has closed the |
| * connection. |
| */ |
| snprintf(buf, sizeof buf, |
| "Connection to %.300s closed by remote host.\r\n", |
| host); |
| buffer_append(&stderr_buffer, buf, strlen(buf)); |
| quit_pending = 1; |
| return; |
| } |
| /* |
| * There is a kernel bug on Solaris that causes select to |
| * sometimes wake up even though there is no data available. |
| */ |
| if (len < 0 && |
| (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK)) |
| len = 0; |
| |
| if (len < 0) { |
| /* |
| * An error has encountered. Perhaps there is a |
| * network problem. |
| */ |
| snprintf(buf, sizeof buf, |
| "Read from remote host %.300s: %.100s\r\n", |
| host, strerror(errno)); |
| buffer_append(&stderr_buffer, buf, strlen(buf)); |
| quit_pending = 1; |
| return; |
| } |
| packet_process_incoming(buf, len); |
| } |
| } |
| |
| static void |
| client_status_confirm(int type, Channel *c, void *ctx) |
| { |
| struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx; |
| char errmsg[256]; |
| int tochan; |
| |
| /* |
| * If a TTY was explicitly requested, then a failure to allocate |
| * one is fatal. |
| */ |
| if (cr->action == CONFIRM_TTY && |
| (options.request_tty == REQUEST_TTY_FORCE || |
| options.request_tty == REQUEST_TTY_YES)) |
| cr->action = CONFIRM_CLOSE; |
| |
| /* XXX supress on mux _client_ quietmode */ |
| tochan = options.log_level >= SYSLOG_LEVEL_ERROR && |
| c->ctl_chan != -1 && c->extended_usage == CHAN_EXTENDED_WRITE; |
| |
| if (type == SSH2_MSG_CHANNEL_SUCCESS) { |
| debug2("%s request accepted on channel %d", |
| cr->request_type, c->self); |
| } else if (type == SSH2_MSG_CHANNEL_FAILURE) { |
| if (tochan) { |
| snprintf(errmsg, sizeof(errmsg), |
| "%s request failed\r\n", cr->request_type); |
| } else { |
| snprintf(errmsg, sizeof(errmsg), |
| "%s request failed on channel %d", |
| cr->request_type, c->self); |
| } |
| /* If error occurred on primary session channel, then exit */ |
| if (cr->action == CONFIRM_CLOSE && c->self == session_ident) |
| fatal("%s", errmsg); |
| /* |
| * If error occurred on mux client, append to |
| * their stderr. |
| */ |
| if (tochan) { |
| buffer_append(&c->extended, errmsg, |
| strlen(errmsg)); |
| } else |
| error("%s", errmsg); |
| if (cr->action == CONFIRM_TTY) { |
| /* |
| * If a TTY allocation error occurred, then arrange |
| * for the correct TTY to leave raw mode. |
| */ |
| if (c->self == session_ident) |
| leave_raw_mode(0); |
| else |
| mux_tty_alloc_failed(c); |
| } else if (cr->action == CONFIRM_CLOSE) { |
| chan_read_failed(c); |
| chan_write_failed(c); |
| } |
| } |
| xfree(cr); |
| } |
| |
| static void |
| client_abandon_status_confirm(Channel *c, void *ctx) |
| { |
| xfree(ctx); |
| } |
| |
| void |
| client_expect_confirm(int id, const char *request, |
| enum confirm_action action) |
| { |
| struct channel_reply_ctx *cr = xmalloc(sizeof(*cr)); |
| |
| cr->request_type = request; |
| cr->action = action; |
| |
| channel_register_status_confirm(id, client_status_confirm, |
| client_abandon_status_confirm, cr); |
| } |
| |
| void |
| client_register_global_confirm(global_confirm_cb *cb, void *ctx) |
| { |
| struct global_confirm *gc, *last_gc; |
| |
| /* Coalesce identical callbacks */ |
| last_gc = TAILQ_LAST(&global_confirms, global_confirms); |
| if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) { |
| if (++last_gc->ref_count >= INT_MAX) |
| fatal("%s: last_gc->ref_count = %d", |
| __func__, last_gc->ref_count); |
| return; |
| } |
| |
| gc = xmalloc(sizeof(*gc)); |
| gc->cb = cb; |
| gc->ctx = ctx; |
| gc->ref_count = 1; |
| TAILQ_INSERT_TAIL(&global_confirms, gc, entry); |
| } |
| |
| static void |
| process_cmdline(void) |
| { |
| void (*handler)(int); |
| char *s, *cmd, *cancel_host; |
| int delete = 0, local = 0, remote = 0, dynamic = 0; |
| int cancel_port, ok; |
| Forward fwd; |
| |
| bzero(&fwd, sizeof(fwd)); |
| fwd.listen_host = fwd.connect_host = NULL; |
| |
| leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE); |
| handler = signal(SIGINT, SIG_IGN); |
| cmd = s = read_passphrase("\r\nssh> ", RP_ECHO); |
| if (s == NULL) |
| goto out; |
| while (isspace(*s)) |
| s++; |
| if (*s == '-') |
| s++; /* Skip cmdline '-', if any */ |
| if (*s == '\0') |
| goto out; |
| |
| if (*s == 'h' || *s == 'H' || *s == '?') { |
| logit("Commands:"); |
| logit(" -L[bind_address:]port:host:hostport " |
| "Request local forward"); |
| logit(" -R[bind_address:]port:host:hostport " |
| "Request remote forward"); |
| logit(" -D[bind_address:]port " |
| "Request dynamic forward"); |
| logit(" -KL[bind_address:]port " |
| "Cancel local forward"); |
| logit(" -KR[bind_address:]port " |
| "Cancel remote forward"); |
| logit(" -KD[bind_address:]port " |
| "Cancel dynamic forward"); |
| if (!options.permit_local_command) |
| goto out; |
| logit(" !args " |
| "Execute local command"); |
| goto out; |
| } |
| |
| if (*s == '!' && options.permit_local_command) { |
| s++; |
| ssh_local_cmd(s); |
| goto out; |
| } |
| |
| if (*s == 'K') { |
| delete = 1; |
| s++; |
| } |
| if (*s == 'L') |
| local = 1; |
| else if (*s == 'R') |
| remote = 1; |
| else if (*s == 'D') |
| dynamic = 1; |
| else { |
| logit("Invalid command."); |
| goto out; |
| } |
| |
| if (delete && !compat20) { |
| logit("Not supported for SSH protocol version 1."); |
| goto out; |
| } |
| |
| while (isspace(*++s)) |
| ; |
| |
| /* XXX update list of forwards in options */ |
| if (delete) { |
| cancel_port = 0; |
| cancel_host = hpdelim(&s); /* may be NULL */ |
| if (s != NULL) { |
| cancel_port = a2port(s); |
| cancel_host = cleanhostname(cancel_host); |
| } else { |
| cancel_port = a2port(cancel_host); |
| cancel_host = NULL; |
| } |
| if (cancel_port <= 0) { |
| logit("Bad forwarding close port"); |
| goto out; |
| } |
| if (remote) |
| ok = channel_request_rforward_cancel(cancel_host, |
| cancel_port) == 0; |
| else if (dynamic) |
| ok = channel_cancel_lport_listener(cancel_host, |
| cancel_port, 0, options.gateway_ports) > 0; |
| else |
| ok = channel_cancel_lport_listener(cancel_host, |
| cancel_port, CHANNEL_CANCEL_PORT_STATIC, |
| options.gateway_ports) > 0; |
| if (!ok) { |
| logit("Unkown port forwarding."); |
| goto out; |
| } |
| logit("Canceled forwarding."); |
| } else { |
| if (!parse_forward(&fwd, s, dynamic, remote)) { |
| logit("Bad forwarding specification."); |
| goto out; |
| } |
| if (local || dynamic) { |
| if (channel_setup_local_fwd_listener(fwd.listen_host, |
| fwd.listen_port, fwd.connect_host, |
| fwd.connect_port, options.gateway_ports) < 0) { |
| logit("Port forwarding failed."); |
| goto out; |
| } |
| } else { |
| if (channel_request_remote_forwarding(fwd.listen_host, |
| fwd.listen_port, fwd.connect_host, |
| fwd.connect_port) < 0) { |
| logit("Port forwarding failed."); |
| goto out; |
| } |
| } |
| logit("Forwarding port."); |
| } |
| |
| out: |
| signal(SIGINT, handler); |
| enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE); |
| if (cmd) |
| xfree(cmd); |
| if (fwd.listen_host != NULL) |
| xfree(fwd.listen_host); |
| if (fwd.connect_host != NULL) |
| xfree(fwd.connect_host); |
| } |
| |
| /* reasons to suppress output of an escape command in help output */ |
| #define SUPPRESS_NEVER 0 /* never suppress, always show */ |
| #define SUPPRESS_PROTO1 1 /* don't show in protocol 1 sessions */ |
| #define SUPPRESS_MUXCLIENT 2 /* don't show in mux client sessions */ |
| #define SUPPRESS_MUXMASTER 4 /* don't show in mux master sessions */ |
| #define SUPPRESS_SYSLOG 8 /* don't show when logging to syslog */ |
| struct escape_help_text { |
| const char *cmd; |
| const char *text; |
| unsigned int flags; |
| }; |
| static struct escape_help_text esc_txt[] = { |
| {".", "terminate session", SUPPRESS_MUXMASTER}, |
| {".", "terminate connection (and any multiplexed sessions)", |
| SUPPRESS_MUXCLIENT}, |
| {"B", "send a BREAK to the remote system", SUPPRESS_PROTO1}, |
| {"C", "open a command line", SUPPRESS_MUXCLIENT}, |
| {"R", "request rekey", SUPPRESS_PROTO1}, |
| {"V/v", "decrease/increase verbosity (LogLevel)", SUPPRESS_MUXCLIENT}, |
| {"^Z", "suspend ssh", SUPPRESS_MUXCLIENT}, |
| {"#", "list forwarded connections", SUPPRESS_NEVER}, |
| {"&", "background ssh (when waiting for connections to terminate)", |
| SUPPRESS_MUXCLIENT}, |
| {"?", "this message", SUPPRESS_NEVER}, |
| }; |
| |
| static void |
| print_escape_help(Buffer *b, int escape_char, int protocol2, int mux_client, |
| int using_stderr) |
| { |
| unsigned int i, suppress_flags; |
| char string[1024]; |
| |
| snprintf(string, sizeof string, "%c?\r\n" |
| "Supported escape sequences:\r\n", escape_char); |
| buffer_append(b, string, strlen(string)); |
| |
| suppress_flags = (protocol2 ? 0 : SUPPRESS_PROTO1) | |
| (mux_client ? SUPPRESS_MUXCLIENT : 0) | |
| (mux_client ? 0 : SUPPRESS_MUXMASTER) | |
| (using_stderr ? 0 : SUPPRESS_SYSLOG); |
| |
| for (i = 0; i < sizeof(esc_txt)/sizeof(esc_txt[0]); i++) { |
| if (esc_txt[i].flags & suppress_flags) |
| continue; |
| snprintf(string, sizeof string, " %c%-3s - %s\r\n", |
| escape_char, esc_txt[i].cmd, esc_txt[i].text); |
| buffer_append(b, string, strlen(string)); |
| } |
| |
| snprintf(string, sizeof string, |
| " %c%c - send the escape character by typing it twice\r\n" |
| "(Note that escapes are only recognized immediately after " |
| "newline.)\r\n", escape_char, escape_char); |
| buffer_append(b, string, strlen(string)); |
| } |
| |
| /* |
| * Process the characters one by one, call with c==NULL for proto1 case. |
| */ |
| static int |
| process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr, |
| char *buf, int len) |
| { |
| char string[1024]; |
| pid_t pid; |
| int bytes = 0; |
| u_int i; |
| u_char ch; |
| char *s; |
| int *escape_pendingp, escape_char; |
| struct escape_filter_ctx *efc; |
| |
| if (c == NULL) { |
| escape_pendingp = &escape_pending1; |
| escape_char = escape_char1; |
| } else { |
| if (c->filter_ctx == NULL) |
| return 0; |
| efc = (struct escape_filter_ctx *)c->filter_ctx; |
| escape_pendingp = &efc->escape_pending; |
| escape_char = efc->escape_char; |
| } |
| |
| if (len <= 0) |
| return (0); |
| |
| for (i = 0; i < (u_int)len; i++) { |
| /* Get one character at a time. */ |
| ch = buf[i]; |
| |
| if (*escape_pendingp) { |
| /* We have previously seen an escape character. */ |
| /* Clear the flag now. */ |
| *escape_pendingp = 0; |
| |
| /* Process the escaped character. */ |
| switch (ch) { |
| case '.': |
| /* Terminate the connection. */ |
| snprintf(string, sizeof string, "%c.\r\n", |
| escape_char); |
| buffer_append(berr, string, strlen(string)); |
| |
| if (c && c->ctl_chan != -1) { |
| chan_read_failed(c); |
| chan_write_failed(c); |
| mux_master_session_cleanup_cb(c->self, |
| NULL); |
| return 0; |
| } else |
| quit_pending = 1; |
| return -1; |
| |
| case 'Z' - 64: |
| /* XXX support this for mux clients */ |
| if (c && c->ctl_chan != -1) { |
| char b[16]; |
| noescape: |
| if (ch == 'Z' - 64) |
| snprintf(b, sizeof b, "^Z"); |
| else |
| snprintf(b, sizeof b, "%c", ch); |
| snprintf(string, sizeof string, |
| "%c%s escape not available to " |
| "multiplexed sessions\r\n", |
| escape_char, b); |
| buffer_append(berr, string, |
| strlen(string)); |
| continue; |
| } |
| /* Suspend the program. Inform the user */ |
| snprintf(string, sizeof string, |
| "%c^Z [suspend ssh]\r\n", escape_char); |
| buffer_append(berr, string, strlen(string)); |
| |
| /* Restore terminal modes and suspend. */ |
| client_suspend_self(bin, bout, berr); |
| |
| /* We have been continued. */ |
| continue; |
| |
| case 'B': |
| if (compat20) { |
| snprintf(string, sizeof string, |
| "%cB\r\n", escape_char); |
| buffer_append(berr, string, |
| strlen(string)); |
| channel_request_start(session_ident, |
| "break", 0); |
| packet_put_int(1000); |
| packet_send(); |
| } |
| continue; |
| |
| case 'R': |
| if (compat20) { |
| if (datafellows & SSH_BUG_NOREKEY) |
| logit("Server does not " |
| "support re-keying"); |
| else |
| need_rekeying = 1; |
| } |
| continue; |
| |
| case 'V': |
| /* FALLTHROUGH */ |
| case 'v': |
| if (c && c->ctl_chan != -1) |
| goto noescape; |
| if (!log_is_on_stderr()) { |
| snprintf(string, sizeof string, |
| "%c%c [Logging to syslog]\r\n", |
| escape_char, ch); |
| buffer_append(berr, string, |
| strlen(string)); |
| continue; |
| } |
| if (ch == 'V' && options.log_level > |
| SYSLOG_LEVEL_QUIET) |
| log_change_level(--options.log_level); |
| if (ch == 'v' && options.log_level < |
| SYSLOG_LEVEL_DEBUG3) |
| log_change_level(++options.log_level); |
| snprintf(string, sizeof string, |
| "%c%c [LogLevel %s]\r\n", escape_char, ch, |
| log_level_name(options.log_level)); |
| buffer_append(berr, string, strlen(string)); |
| continue; |
| |
| case '&': |
| if (c && c->ctl_chan != -1) |
| goto noescape; |
| /* |
| * Detach the program (continue to serve |
| * connections, but put in background and no |
| * more new connections). |
| */ |
| /* Restore tty modes. */ |
| leave_raw_mode( |
| options.request_tty == REQUEST_TTY_FORCE); |
| |
| /* Stop listening for new connections. */ |
| channel_stop_listening(); |
| |
| snprintf(string, sizeof string, |
| "%c& [backgrounded]\n", escape_char); |
| buffer_append(berr, string, strlen(string)); |
| |
| /* Fork into background. */ |
| pid = fork(); |
| if (pid < 0) { |
| error("fork: %.100s", strerror(errno)); |
| continue; |
| } |
| if (pid != 0) { /* This is the parent. */ |
| /* The parent just exits. */ |
| exit(0); |
| } |
| /* The child continues serving connections. */ |
| if (compat20) { |
| buffer_append(bin, "\004", 1); |
| /* fake EOF on stdin */ |
| return -1; |
| } else if (!stdin_eof) { |
| /* |
| * Sending SSH_CMSG_EOF alone does not |
| * always appear to be enough. So we |
| * try to send an EOF character first. |
| */ |
| packet_start(SSH_CMSG_STDIN_DATA); |
| packet_put_string("\004", 1); |
| packet_send(); |
| /* Close stdin. */ |
| stdin_eof = 1; |
| if (buffer_len(bin) == 0) { |
| packet_start(SSH_CMSG_EOF); |
| packet_send(); |
| } |
| } |
| continue; |
| |
| case '?': |
| print_escape_help(berr, escape_char, compat20, |
| (c && c->ctl_chan != -1), |
| log_is_on_stderr()); |
| continue; |
| |
| case '#': |
| snprintf(string, sizeof string, "%c#\r\n", |
| escape_char); |
| buffer_append(berr, string, strlen(string)); |
| s = channel_open_message(); |
| buffer_append(berr, s, strlen(s)); |
| xfree(s); |
| continue; |
| |
| case 'C': |
| if (c && c->ctl_chan != -1) |
| goto noescape; |
| process_cmdline(); |
| continue; |
| |
| default: |
| if (ch != escape_char) { |
| buffer_put_char(bin, escape_char); |
| bytes++; |
| } |
| /* Escaped characters fall through here */ |
| break; |
| } |
| } else { |
| /* |
| * The previous character was not an escape char. |
| * Check if this is an escape. |
| */ |
| if (last_was_cr && ch == escape_char) { |
| /* |
| * It is. Set the flag and continue to |
| * next character. |
| */ |
| *escape_pendingp = 1; |
| continue; |
| } |
| } |
| |
| /* |
| * Normal character. Record whether it was a newline, |
| * and append it to the buffer. |
| */ |
| last_was_cr = (ch == '\r' || ch == '\n'); |
| buffer_put_char(bin, ch); |
| bytes++; |
| } |
| return bytes; |
| } |
| |
| static void |
| client_process_input(fd_set *readset) |
| { |
| int len; |
| char buf[SSH_IOBUFSZ]; |
| |
| /* Read input from stdin. */ |
| if (FD_ISSET(fileno(stdin), readset)) { |
| /* Read as much as possible. */ |
| len = read(fileno(stdin), buf, sizeof(buf)); |
| if (len < 0 && |
| (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK)) |
| return; /* we'll try again later */ |
| if (len <= 0) { |
| /* |
| * Received EOF or error. They are treated |
| * similarly, except that an error message is printed |
| * if it was an error condition. |
| */ |
| if (len < 0) { |
| snprintf(buf, sizeof buf, "read: %.100s\r\n", |
| strerror(errno)); |
| buffer_append(&stderr_buffer, buf, strlen(buf)); |
| } |
| /* Mark that we have seen EOF. */ |
| stdin_eof = 1; |
| /* |
| * Send an EOF message to the server unless there is |
| * data in the buffer. If there is data in the |
| * buffer, no message will be sent now. Code |
| * elsewhere will send the EOF when the buffer |
| * becomes empty if stdin_eof is set. |
| */ |
| if (buffer_len(&stdin_buffer) == 0) { |
| packet_start(SSH_CMSG_EOF); |
| packet_send(); |
| } |
| } else if (escape_char1 == SSH_ESCAPECHAR_NONE) { |
| /* |
| * Normal successful read, and no escape character. |
| * Just append the data to buffer. |
| */ |
| buffer_append(&stdin_buffer, buf, len); |
| } else { |
| /* |
| * Normal, successful read. But we have an escape |
| * character and have to process the characters one |
| * by one. |
| */ |
| if (process_escapes(NULL, &stdin_buffer, |
| &stdout_buffer, &stderr_buffer, buf, len) == -1) |
| return; |
| } |
| } |
| } |
| |
| static void |
| client_process_output(fd_set *writeset) |
| { |
| int len; |
| char buf[100]; |
| |
| /* Write buffered output to stdout. */ |
| if (FD_ISSET(fileno(stdout), writeset)) { |
| /* Write as much data as possible. */ |
| len = write(fileno(stdout), buffer_ptr(&stdout_buffer), |
| buffer_len(&stdout_buffer)); |
| if (len <= 0) { |
| if (errno == EINTR || errno == EAGAIN || |
| errno == EWOULDBLOCK) |
| len = 0; |
| else { |
| /* |
| * An error or EOF was encountered. Put an |
| * error message to stderr buffer. |
| */ |
| snprintf(buf, sizeof buf, |
| "write stdout: %.50s\r\n", strerror(errno)); |
| buffer_append(&stderr_buffer, buf, strlen(buf)); |
| quit_pending = 1; |
| return; |
| } |
| } |
| /* Consume printed data from the buffer. */ |
| buffer_consume(&stdout_buffer, len); |
| } |
| /* Write buffered output to stderr. */ |
| if (FD_ISSET(fileno(stderr), writeset)) { |
| /* Write as much data as possible. */ |
| len = write(fileno(stderr), buffer_ptr(&stderr_buffer), |
| buffer_len(&stderr_buffer)); |
| if (len <= 0) { |
| if (errno == EINTR || errno == EAGAIN || |
| errno == EWOULDBLOCK) |
| len = 0; |
| else { |
| /* |
| * EOF or error, but can't even print |
| * error message. |
| */ |
| quit_pending = 1; |
| return; |
| } |
| } |
| /* Consume printed characters from the buffer. */ |
| buffer_consume(&stderr_buffer, len); |
| } |
| } |
| |
| /* |
| * Get packets from the connection input buffer, and process them as long as |
| * there are packets available. |
| * |
| * Any unknown packets received during the actual |
| * session cause the session to terminate. This is |
| * intended to make debugging easier since no |
| * confirmations are sent. Any compatible protocol |
| * extensions must be negotiated during the |
| * preparatory phase. |
| */ |
| |
| static void |
| client_process_buffered_input_packets(void) |
| { |
| dispatch_run(DISPATCH_NONBLOCK, &quit_pending, |
| compat20 ? xxx_kex : NULL); |
| } |
| |
| /* scan buf[] for '~' before sending data to the peer */ |
| |
| /* Helper: allocate a new escape_filter_ctx and fill in its escape char */ |
| void * |
| client_new_escape_filter_ctx(int escape_char) |
| { |
| struct escape_filter_ctx *ret; |
| |
| ret = xmalloc(sizeof(*ret)); |
| ret->escape_pending = 0; |
| ret->escape_char = escape_char; |
| return (void *)ret; |
| } |
| |
| /* Free the escape filter context on channel free */ |
| void |
| client_filter_cleanup(int cid, void *ctx) |
| { |
| xfree(ctx); |
| } |
| |
| int |
| client_simple_escape_filter(Channel *c, char *buf, int len) |
| { |
| if (c->extended_usage != CHAN_EXTENDED_WRITE) |
| return 0; |
| |
| return process_escapes(c, &c->input, &c->output, &c->extended, |
| buf, len); |
| } |
| |
| static void |
| client_channel_closed(int id, void *arg) |
| { |
| channel_cancel_cleanup(id); |
| session_closed = 1; |
| leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE); |
| } |
| |
| /* |
| * Implements the interactive session with the server. This is called after |
| * the user has been authenticated, and a command has been started on the |
| * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character |
| * used as an escape character for terminating or suspending the session. |
| */ |
| |
| int |
| client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id) |
| { |
| fd_set *readset = NULL, *writeset = NULL; |
| double start_time, total_time; |
| int max_fd = 0, max_fd2 = 0, len, rekeying = 0; |
| u_int64_t ibytes, obytes; |
| u_int nalloc = 0; |
| char buf[100]; |
| |
| debug("Entering interactive session."); |
| |
| start_time = get_current_time(); |
| |
| /* Initialize variables. */ |
| escape_pending1 = 0; |
| last_was_cr = 1; |
| exit_status = -1; |
| stdin_eof = 0; |
| buffer_high = 64 * 1024; |
| connection_in = packet_get_connection_in(); |
| connection_out = packet_get_connection_out(); |
| max_fd = MAX(connection_in, connection_out); |
| |
| if (!compat20) { |
| /* enable nonblocking unless tty */ |
| if (!isatty(fileno(stdin))) |
| set_nonblock(fileno(stdin)); |
| if (!isatty(fileno(stdout))) |
| set_nonblock(fileno(stdout)); |
| if (!isatty(fileno(stderr))) |
| set_nonblock(fileno(stderr)); |
| max_fd = MAX(max_fd, fileno(stdin)); |
| max_fd = MAX(max_fd, fileno(stdout)); |
| max_fd = MAX(max_fd, fileno(stderr)); |
| } |
| quit_pending = 0; |
| escape_char1 = escape_char_arg; |
| |
| /* Initialize buffers. */ |
| buffer_init(&stdin_buffer); |
| buffer_init(&stdout_buffer); |
| buffer_init(&stderr_buffer); |
| |
| client_init_dispatch(); |
| |
| /* |
| * Set signal handlers, (e.g. to restore non-blocking mode) |
| * but don't overwrite SIG_IGN, matches behaviour from rsh(1) |
| */ |
| if (signal(SIGHUP, SIG_IGN) != SIG_IGN) |
| signal(SIGHUP, signal_handler); |
| if (signal(SIGINT, SIG_IGN) != SIG_IGN) |
| signal(SIGINT, signal_handler); |
| if (signal(SIGQUIT, SIG_IGN) != SIG_IGN) |
| signal(SIGQUIT, signal_handler); |
| if (signal(SIGTERM, SIG_IGN) != SIG_IGN) |
| signal(SIGTERM, signal_handler); |
| signal(SIGWINCH, window_change_handler); |
| |
| if (have_pty) |
| enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE); |
| |
| if (compat20) { |
| session_ident = ssh2_chan_id; |
| if (session_ident != -1) { |
| if (escape_char_arg != SSH_ESCAPECHAR_NONE) { |
| channel_register_filter(session_ident, |
| client_simple_escape_filter, NULL, |
| client_filter_cleanup, |
| client_new_escape_filter_ctx( |
| escape_char_arg)); |
| } |
| channel_register_cleanup(session_ident, |
| client_channel_closed, 0); |
| } |
| } else { |
| /* Check if we should immediately send eof on stdin. */ |
| client_check_initial_eof_on_stdin(); |
| } |
| |
| /* Main loop of the client for the interactive session mode. */ |
| while (!quit_pending) { |
| |
| /* Process buffered packets sent by the server. */ |
| client_process_buffered_input_packets(); |
| |
| if (compat20 && session_closed && !channel_still_open()) |
| break; |
| |
| rekeying = (xxx_kex != NULL && !xxx_kex->done); |
| |
| if (rekeying) { |
| debug("rekeying in progress"); |
| } else { |
| /* |
| * Make packets of buffered stdin data, and buffer |
| * them for sending to the server. |
| */ |
| if (!compat20) |
| client_make_packets_from_stdin_data(); |
| |
| /* |
| * Make packets from buffered channel data, and |
| * enqueue them for sending to the server. |
| */ |
| if (packet_not_very_much_data_to_write()) |
| channel_output_poll(); |
| |
| /* |
| * Check if the window size has changed, and buffer a |
| * message about it to the server if so. |
| */ |
| client_check_window_change(); |
| |
| if (quit_pending) |
| break; |
| } |
| /* |
| * Wait until we have something to do (something becomes |
| * available on one of the descriptors). |
| */ |
| max_fd2 = max_fd; |
| client_wait_until_can_do_something(&readset, &writeset, |
| &max_fd2, &nalloc, rekeying); |
| |
| if (quit_pending) |
| break; |
| |
| /* Do channel operations unless rekeying in progress. */ |
| if (!rekeying) { |
| channel_after_select(readset, writeset); |
| if (need_rekeying || packet_need_rekeying()) { |
| debug("need rekeying"); |
| xxx_kex->done = 0; |
| kex_send_kexinit(xxx_kex); |
| need_rekeying = 0; |
| } |
| } |
| |
| /* Buffer input from the connection. */ |
| client_process_net_input(readset); |
| |
| if (quit_pending) |
| break; |
| |
| if (!compat20) { |
| /* Buffer data from stdin */ |
| client_process_input(readset); |
| /* |
| * Process output to stdout and stderr. Output to |
| * the connection is processed elsewhere (above). |
| */ |
| client_process_output(writeset); |
| } |
| |
| if (session_resumed) { |
| connection_in = packet_get_connection_in(); |
| connection_out = packet_get_connection_out(); |
| max_fd = MAX(max_fd, connection_out); |
| max_fd = MAX(max_fd, connection_in); |
| session_resumed = 0; |
| } |
| |
| /* |
| * Send as much buffered packet data as possible to the |
| * sender. |
| */ |
| if (FD_ISSET(connection_out, writeset)) |
| packet_write_poll(); |
| |
| /* |
| * If we are a backgrounded control master, and the |
| * timeout has expired without any active client |
| * connections, then quit. |
| */ |
| if (control_persist_exit_time > 0) { |
| if (time(NULL) >= control_persist_exit_time) { |
| debug("ControlPersist timeout expired"); |
| break; |
| } |
| } |
| } |
| if (readset) |
| xfree(readset); |
| if (writeset) |
| xfree(writeset); |
| |
| /* Terminate the session. */ |
| |
| /* Stop watching for window change. */ |
| signal(SIGWINCH, SIG_DFL); |
| |
| if (compat20) { |
| packet_start(SSH2_MSG_DISCONNECT); |
| packet_put_int(SSH2_DISCONNECT_BY_APPLICATION); |
| packet_put_cstring("disconnected by user"); |
| packet_put_cstring(""); /* language tag */ |
| packet_send(); |
| packet_write_wait(); |
| } |
| |
| channel_free_all(); |
| |
| if (have_pty) |
| leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE); |
| |
| /* restore blocking io */ |
| if (!isatty(fileno(stdin))) |
| unset_nonblock(fileno(stdin)); |
| if (!isatty(fileno(stdout))) |
| unset_nonblock(fileno(stdout)); |
| if (!isatty(fileno(stderr))) |
| unset_nonblock(fileno(stderr)); |
| |
| /* |
| * If there was no shell or command requested, there will be no remote |
| * exit status to be returned. In that case, clear error code if the |
| * connection was deliberately terminated at this end. |
| */ |
| if (no_shell_flag && received_signal == SIGTERM) { |
| received_signal = 0; |
| exit_status = 0; |
| } |
| |
| if (received_signal) |
| fatal("Killed by signal %d.", (int) received_signal); |
| |
| /* |
| * In interactive mode (with pseudo tty) display a message indicating |
| * that the connection has been closed. |
| */ |
| if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) { |
| snprintf(buf, sizeof buf, |
| "Connection to %.64s closed.\r\n", host); |
| buffer_append(&stderr_buffer, buf, strlen(buf)); |
| } |
| |
| /* Output any buffered data for stdout. */ |
| if (buffer_len(&stdout_buffer) > 0) { |
| len = atomicio(vwrite, fileno(stdout), |
| buffer_ptr(&stdout_buffer), buffer_len(&stdout_buffer)); |
| if (len < 0 || (u_int)len != buffer_len(&stdout_buffer)) |
| error("Write failed flushing stdout buffer."); |
| else |
| buffer_consume(&stdout_buffer, len); |
| } |
| |
| /* Output any buffered data for stderr. */ |
| if (buffer_len(&stderr_buffer) > 0) { |
| len = atomicio(vwrite, fileno(stderr), |
| buffer_ptr(&stderr_buffer), buffer_len(&stderr_buffer)); |
| if (len < 0 || (u_int)len != buffer_len(&stderr_buffer)) |
| error("Write failed flushing stderr buffer."); |
| else |
| buffer_consume(&stderr_buffer, len); |
| } |
| |
| /* Clear and free any buffers. */ |
| memset(buf, 0, sizeof(buf)); |
| buffer_free(&stdin_buffer); |
| buffer_free(&stdout_buffer); |
| buffer_free(&stderr_buffer); |
| |
| /* Report bytes transferred, and transfer rates. */ |
| total_time = get_current_time() - start_time; |
| packet_get_state(MODE_IN, NULL, NULL, NULL, &ibytes); |
| packet_get_state(MODE_OUT, NULL, NULL, NULL, &obytes); |
| verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds", |
| (unsigned long long)obytes, (unsigned long long)ibytes, total_time); |
| if (total_time > 0) |
| verbose("Bytes per second: sent %.1f, received %.1f", |
| obytes / total_time, ibytes / total_time); |
| /* Return the exit status of the program. */ |
| debug("Exit status %d", exit_status); |
| return exit_status; |
| } |
| |
| /*********/ |
| |
| static void |
| client_input_stdout_data(int type, u_int32_t seq, void *ctxt) |
| { |
| u_int data_len; |
| char *data = packet_get_string(&data_len); |
| packet_check_eom(); |
| buffer_append(&stdout_buffer, data, data_len); |
| memset(data, 0, data_len); |
| xfree(data); |
| } |
| static void |
| client_input_stderr_data(int type, u_int32_t seq, void *ctxt) |
| { |
| u_int data_len; |
| char *data = packet_get_string(&data_len); |
| packet_check_eom(); |
| buffer_append(&stderr_buffer, data, data_len); |
| memset(data, 0, data_len); |
| xfree(data); |
| } |
| static void |
| client_input_exit_status(int type, u_int32_t seq, void *ctxt) |
| { |
| exit_status = packet_get_int(); |
| packet_check_eom(); |
| /* Acknowledge the exit. */ |
| packet_start(SSH_CMSG_EXIT_CONFIRMATION); |
| packet_send(); |
| /* |
| * Must wait for packet to be sent since we are |
| * exiting the loop. |
| */ |
| packet_write_wait(); |
| /* Flag that we want to exit. */ |
| quit_pending = 1; |
| } |
| static void |
| client_input_agent_open(int type, u_int32_t seq, void *ctxt) |
| { |
| Channel *c = NULL; |
| int remote_id, sock; |
| |
| /* Read the remote channel number from the message. */ |
| remote_id = packet_get_int(); |
| packet_check_eom(); |
| |
| /* |
| * Get a connection to the local authentication agent (this may again |
| * get forwarded). |
| */ |
| sock = ssh_get_authentication_socket(); |
| |
| /* |
| * If we could not connect the agent, send an error message back to |
| * the server. This should never happen unless the agent dies, |
| * because authentication forwarding is only enabled if we have an |
| * agent. |
| */ |
| if (sock >= 0) { |
| c = channel_new("", SSH_CHANNEL_OPEN, sock, sock, |
| -1, 0, 0, 0, "authentication agent connection", 1); |
| c->remote_id = remote_id; |
| c->force_drain = 1; |
| } |
| if (c == NULL) { |
| packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
| packet_put_int(remote_id); |
| } else { |
| /* Send a confirmation to the remote host. */ |
| debug("Forwarding authentication connection."); |
| packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); |
| packet_put_int(remote_id); |
| packet_put_int(c->self); |
| } |
| packet_send(); |
| } |
| |
| static Channel * |
| client_request_forwarded_tcpip(const char *request_type, int rchan) |
| { |
| Channel *c = NULL; |
| char *listen_address, *originator_address; |
| u_short listen_port, originator_port; |
| |
| /* Get rest of the packet */ |
| listen_address = packet_get_string(NULL); |
| listen_port = packet_get_int(); |
| originator_address = packet_get_string(NULL); |
| originator_port = packet_get_int(); |
| packet_check_eom(); |
| |
| debug("client_request_forwarded_tcpip: listen %s port %d, " |
| "originator %s port %d", listen_address, listen_port, |
| originator_address, originator_port); |
| |
| c = channel_connect_by_listen_address(listen_port, |
| "forwarded-tcpip", originator_address); |
| |
| xfree(originator_address); |
| xfree(listen_address); |
| return c; |
| } |
| |
| static Channel * |
| client_request_x11(const char *request_type, int rchan) |
| { |
| Channel *c = NULL; |
| char *originator; |
| u_short originator_port; |
| int sock; |
| |
| if (!options.forward_x11) { |
| error("Warning: ssh server tried X11 forwarding."); |
| error("Warning: this is probably a break-in attempt by a " |
| "malicious server."); |
| return NULL; |
| } |
| if (x11_refuse_time != 0 && time(NULL) >= x11_refuse_time) { |
| verbose("Rejected X11 connection after ForwardX11Timeout " |
| "expired"); |
| return NULL; |
| } |
| originator = packet_get_string(NULL); |
| if (datafellows & SSH_BUG_X11FWD) { |
| debug2("buggy server: x11 request w/o originator_port"); |
| originator_port = 0; |
| } else { |
| originator_port = packet_get_int(); |
| } |
| packet_check_eom(); |
| /* XXX check permission */ |
| debug("client_request_x11: request from %s %d", originator, |
| originator_port); |
| xfree(originator); |
| sock = x11_connect_display(); |
| if (sock < 0) |
| return NULL; |
| c = channel_new("x11", |
| SSH_CHANNEL_X11_OPEN, sock, sock, -1, |
| CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1); |
| c->force_drain = 1; |
| return c; |
| } |
| |
| static Channel * |
| client_request_agent(const char *request_type, int rchan) |
| { |
| Channel *c = NULL; |
| int sock; |
| |
| if (!options.forward_agent) { |
| error("Warning: ssh server tried agent forwarding."); |
| error("Warning: this is probably a break-in attempt by a " |
| "malicious server."); |
| return NULL; |
| } |
| sock = ssh_get_authentication_socket(); |
| if (sock < 0) |
| return NULL; |
| c = channel_new("authentication agent connection", |
| SSH_CHANNEL_OPEN, sock, sock, -1, |
| CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, |
| "authentication agent connection", 1); |
| c->force_drain = 1; |
| return c; |
| } |
| |
| int |
| client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun) |
| { |
| Channel *c; |
| int fd; |
| |
| if (tun_mode == SSH_TUNMODE_NO) |
| return 0; |
| |
| if (!compat20) { |
| error("Tunnel forwarding is not supported for protocol 1"); |
| return -1; |
| } |
| |
| debug("Requesting tun unit %d in mode %d", local_tun, tun_mode); |
| |
| /* Open local tunnel device */ |
| if ((fd = tun_open(local_tun, tun_mode)) == -1) { |
| error("Tunnel device open failed."); |
| return -1; |
| } |
| |
| c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1, |
| CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1); |
| c->datagram = 1; |
| |
| #if defined(SSH_TUN_FILTER) |
| if (options.tun_open == SSH_TUNMODE_POINTOPOINT) |
| channel_register_filter(c->self, sys_tun_infilter, |
| sys_tun_outfilter, NULL, NULL); |
| #endif |
| |
| packet_start(SSH2_MSG_CHANNEL_OPEN); |
| packet_put_cstring("tun@openssh.com"); |
| packet_put_int(c->self); |
| packet_put_int(c->local_window_max); |
| packet_put_int(c->local_maxpacket); |
| packet_put_int(tun_mode); |
| packet_put_int(remote_tun); |
| packet_send(); |
| |
| return 0; |
| } |
| |
| /* XXXX move to generic input handler */ |
| static void |
| client_input_channel_open(int type, u_int32_t seq, void *ctxt) |
| { |
| Channel *c = NULL; |
| char *ctype; |
| int rchan; |
| u_int rmaxpack, rwindow, len; |
| |
| ctype = packet_get_string(&len); |
| rchan = packet_get_int(); |
| rwindow = packet_get_int(); |
| rmaxpack = packet_get_int(); |
| |
| debug("client_input_channel_open: ctype %s rchan %d win %d max %d", |
| ctype, rchan, rwindow, rmaxpack); |
| |
| if (strcmp(ctype, "forwarded-tcpip") == 0) { |
| c = client_request_forwarded_tcpip(ctype, rchan); |
| } else if (strcmp(ctype, "x11") == 0) { |
| c = client_request_x11(ctype, rchan); |
| } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) { |
| c = client_request_agent(ctype, rchan); |
| } |
| /* XXX duplicate : */ |
| if (c != NULL) { |
| debug("confirm %s", ctype); |
| c->remote_id = rchan; |
| c->remote_window = rwindow; |
| c->remote_maxpacket = rmaxpack; |
| if (c->type != SSH_CHANNEL_CONNECTING) { |
| packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); |
| packet_put_int(c->remote_id); |
| packet_put_int(c->self); |
| packet_put_int(c->local_window); |
| packet_put_int(c->local_maxpacket); |
| packet_send(); |
| } |
| } else { |
| debug("failure %s", ctype); |
| packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); |
| packet_put_int(rchan); |
| packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED); |
| if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
| packet_put_cstring("open failed"); |
| packet_put_cstring(""); |
| } |
| packet_send(); |
| } |
| xfree(ctype); |
| } |
| static void |
| client_input_channel_req(int type, u_int32_t seq, void *ctxt) |
| { |
| Channel *c = NULL; |
| int exitval, id, reply, success = 0; |
| char *rtype; |
| |
| id = packet_get_int(); |
| rtype = packet_get_string(NULL); |
| reply = packet_get_char(); |
| |
| debug("client_input_channel_req: channel %d rtype %s reply %d", |
| id, rtype, reply); |
| |
| if (id == -1) { |
| error("client_input_channel_req: request for channel -1"); |
| } else if ((c = channel_lookup(id)) == NULL) { |
| error("client_input_channel_req: channel %d: " |
| "unknown channel", id); |
| } else if (strcmp(rtype, "eow@openssh.com") == 0) { |
| packet_check_eom(); |
| chan_rcvd_eow(c); |
| } else if (strcmp(rtype, "exit-status") == 0) { |
| exitval = packet_get_int(); |
| if (c->ctl_chan != -1) { |
| mux_exit_message(c, exitval); |
| success = 1; |
| } else if (id == session_ident) { |
| /* Record exit value of local session */ |
| success = 1; |
| exit_status = exitval; |
| } else { |
| /* Probably for a mux channel that has already closed */ |
| debug("%s: no sink for exit-status on channel %d", |
| __func__, id); |
| } |
| packet_check_eom(); |
| } |
| if (reply && c != NULL) { |
| packet_start(success ? |
| SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); |
| packet_put_int(c->remote_id); |
| packet_send(); |
| } |
| xfree(rtype); |
| } |
| static void |
| client_input_global_request(int type, u_int32_t seq, void *ctxt) |
| { |
| char *rtype; |
| int want_reply; |
| int success = 0; |
| |
| rtype = packet_get_string(NULL); |
| want_reply = packet_get_char(); |
| debug("client_input_global_request: rtype %s want_reply %d", |
| rtype, want_reply); |
| if (want_reply) { |
| packet_start(success ? |
| SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE); |
| packet_send(); |
| packet_write_wait(); |
| } |
| xfree(rtype); |
| } |
| |
| void |
| client_session2_setup(int id, int want_tty, int want_subsystem, |
| const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env) |
| { |
| int len; |
| Channel *c = NULL; |
| |
| debug2("%s: id %d", __func__, id); |
| |
| if ((c = channel_lookup(id)) == NULL) |
| fatal("client_session2_setup: channel %d: unknown channel", id); |
| |
| packet_set_interactive(want_tty, |
| options.ip_qos_interactive, options.ip_qos_bulk); |
| |
| if (want_tty) { |
| struct winsize ws; |
| |
| /* Store window size in the packet. */ |
| if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0) |
| memset(&ws, 0, sizeof(ws)); |
| |
| channel_request_start(id, "pty-req", 1); |
| client_expect_confirm(id, "PTY allocation", CONFIRM_TTY); |
| packet_put_cstring(term != NULL ? term : ""); |
| packet_put_int((u_int)ws.ws_col); |
| packet_put_int((u_int)ws.ws_row); |
| packet_put_int((u_int)ws.ws_xpixel); |
| packet_put_int((u_int)ws.ws_ypixel); |
| if (tiop == NULL) |
| tiop = get_saved_tio(); |
| tty_make_modes(-1, tiop); |
| packet_send(); |
| /* XXX wait for reply */ |
| c->client_tty = 1; |
| } |
| |
| /* Transfer any environment variables from client to server */ |
| if (options.num_send_env != 0 && env != NULL) { |
| int i, j, matched; |
| char *name, *val; |
| |
| debug("Sending environment."); |
| for (i = 0; env[i] != NULL; i++) { |
| /* Split */ |
| name = xstrdup(env[i]); |
| if ((val = strchr(name, '=')) == NULL) { |
| xfree(name); |
| continue; |
| } |
| *val++ = '\0'; |
| |
| matched = 0; |
| for (j = 0; j < options.num_send_env; j++) { |
| if (match_pattern(name, options.send_env[j])) { |
| matched = 1; |
| break; |
| } |
| } |
| if (!matched) { |
| debug3("Ignored env %s", name); |
| xfree(name); |
| continue; |
| } |
| |
| debug("Sending env %s = %s", name, val); |
| channel_request_start(id, "env", 0); |
| packet_put_cstring(name); |
| packet_put_cstring(val); |
| packet_send(); |
| xfree(name); |
| } |
| } |
| |
| len = buffer_len(cmd); |
| if (len > 0) { |
| if (len > 900) |
| len = 900; |
| if (want_subsystem) { |
| debug("Sending subsystem: %.*s", |
| len, (u_char*)buffer_ptr(cmd)); |
| channel_request_start(id, "subsystem", 1); |
| client_expect_confirm(id, "subsystem", CONFIRM_CLOSE); |
| } else { |
| debug("Sending command: %.*s", |
| len, (u_char*)buffer_ptr(cmd)); |
| channel_request_start(id, "exec", 1); |
| client_expect_confirm(id, "exec", CONFIRM_CLOSE); |
| } |
| packet_put_string(buffer_ptr(cmd), buffer_len(cmd)); |
| packet_send(); |
| } else { |
| channel_request_start(id, "shell", 1); |
| client_expect_confirm(id, "shell", CONFIRM_CLOSE); |
| packet_send(); |
| } |
| } |
| |
| static void |
| client_init_dispatch_20(void) |
| { |
| dispatch_init(&dispatch_protocol_error); |
| |
| dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose); |
| dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data); |
| dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof); |
| dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data); |
| dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open); |
| dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
| dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); |
| dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req); |
| dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); |
| dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm); |
| dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm); |
| dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request); |
| |
| /* rekeying */ |
| dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit); |
| |
| /* global request reply messages */ |
| dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply); |
| dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply); |
| } |
| |
| static void |
| client_init_dispatch_13(void) |
| { |
| dispatch_init(NULL); |
| dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); |
| dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation); |
| dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); |
| dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
| dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); |
| dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); |
| dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status); |
| dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data); |
| dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data); |
| |
| dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ? |
| &client_input_agent_open : &deny_input_open); |
| dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ? |
| &x11_input_open : &deny_input_open); |
| } |
| |
| static void |
| client_init_dispatch_15(void) |
| { |
| client_init_dispatch_13(); |
| dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); |
| dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose); |
| } |
| |
| static void |
| client_init_dispatch(void) |
| { |
| if (compat20) |
| client_init_dispatch_20(); |
| else if (compat13) |
| client_init_dispatch_13(); |
| else |
| client_init_dispatch_15(); |
| } |
| |
| void |
| client_stop_mux(void) |
| { |
| if (options.control_path != NULL && muxserver_sock != -1) |
| unlink(options.control_path); |
| /* |
| * If we are in persist mode, signal that we should close when all |
| * active channels are closed. |
| */ |
| if (options.control_persist) { |
| session_closed = 1; |
| setproctitle("[stopped mux]"); |
| } |
| } |
| |
| /* client specific fatal cleanup */ |
| void |
| cleanup_exit(int i) |
| { |
| leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE); |
| leave_non_blocking(); |
| if (options.control_path != NULL && muxserver_sock != -1) |
| unlink(options.control_path); |
| ssh_kill_proxy_command(); |
| _exit(i); |
| } |