Mercurial > dropbear
view cli-chansession.c @ 69:59d16db56e9f
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author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 12 Aug 2004 15:41:36 +0000 |
parents | 3a4f0ef1e8c3 |
children | e3adf4cf5465 |
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#include "includes.h" #include "packet.h" #include "buffer.h" #include "session.h" #include "dbutil.h" #include "channel.h" #include "ssh.h" #include "runopts.h" #include "termcodes.h" static void cli_closechansess(struct Channel *channel); static int cli_initchansess(struct Channel *channel); static void start_channel_request(struct Channel *channel, unsigned char *type); static void send_chansess_pty_req(struct Channel *channel); static void send_chansess_shell_req(struct Channel *channel); static void cli_tty_setup(); void cli_tty_cleanup(); static const struct ChanType clichansess = { 0, /* sepfds */ "session", /* name */ cli_initchansess, /* inithandler */ NULL, /* checkclosehandler */ NULL, /* reqhandler */ cli_closechansess, /* closehandler */ }; /* If the main session goes, we close it up */ static void cli_closechansess(struct Channel *channel) { /* This channel hasn't gone yet, so we have > 1 */ if (ses.chancount > 1) { dropbear_log(LOG_INFO, "Waiting for other channels to close..."); } cli_tty_cleanup(); /* Restore tty modes etc */ } static void start_channel_request(struct Channel *channel, unsigned char *type) { CHECKCLEARTOWRITE(); buf_putbyte(ses.writepayload, SSH_MSG_CHANNEL_REQUEST); buf_putint(ses.writepayload, channel->remotechan); buf_putstring(ses.writepayload, type, strlen(type)); } /* Taken from OpenSSH's sshtty.c: * RCSID("OpenBSD: sshtty.c,v 1.5 2003/09/19 17:43:35 markus Exp "); */ static void cli_tty_setup() { struct termios tio; TRACE(("enter cli_pty_setup")); if (cli_ses.tty_raw_mode == 1) { TRACE(("leave cli_tty_setup: already in raw mode!")); return; } if (tcgetattr(STDIN_FILENO, &tio) == -1) { dropbear_exit("Failed to set raw TTY mode"); } /* make a copy */ cli_ses.saved_tio = tio; tio.c_iflag |= IGNPAR; tio.c_iflag &= ~(ISTRIP | INLCR | IGNCR | ICRNL | IXON | IXANY | IXOFF); #ifdef IUCLC tio.c_iflag &= ~IUCLC; #endif tio.c_lflag &= ~(ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHONL); #ifdef IEXTEN tio.c_lflag &= ~IEXTEN; #endif tio.c_oflag &= ~OPOST; tio.c_cc[VMIN] = 1; tio.c_cc[VTIME] = 0; if (tcsetattr(STDIN_FILENO, TCSADRAIN, &tio) == -1) { dropbear_exit("Failed to set raw TTY mode"); } cli_ses.tty_raw_mode = 1; TRACE(("leave cli_tty_setup")); } void cli_tty_cleanup() { TRACE(("enter cli_tty_cleanup")); if (cli_ses.tty_raw_mode == 0) { TRACE(("leave cli_tty_cleanup: not in raw mode")); return; } if (tcsetattr(STDIN_FILENO, TCSADRAIN, &cli_ses.saved_tio) == -1) { dropbear_log(LOG_WARNING, "Failed restoring TTY"); } else { cli_ses.tty_raw_mode = 0; } TRACE(("leave cli_tty_cleanup")); } static void put_termcodes() { TRACE(("enter put_termcodes")); struct termios tio; unsigned int sshcode; const struct TermCode *termcode; unsigned int value; unsigned int mapcode; unsigned int bufpos1, bufpos2; if (tcgetattr(STDIN_FILENO, &tio) == -1) { dropbear_log(LOG_WARNING, "Failed reading termmodes"); buf_putint(ses.writepayload, 1); /* Just the terminator */ buf_putbyte(ses.writepayload, 0); /* TTY_OP_END */ return; } bufpos1 = ses.writepayload->pos; buf_putint(ses.writepayload, 0); /* A placeholder for the final length */ /* As with Dropbear server, we ignore baud rates for now */ for (sshcode = 1; sshcode < MAX_TERMCODE; sshcode++) { termcode = &termcodes[sshcode]; mapcode = termcode->mapcode; switch (termcode->type) { case TERMCODE_NONE: continue; case TERMCODE_CONTROLCHAR: value = tio.c_cc[mapcode]; break; case TERMCODE_INPUT: value = tio.c_iflag & mapcode; break; case TERMCODE_OUTPUT: value = tio.c_oflag & mapcode; break; case TERMCODE_LOCAL: value = tio.c_lflag & mapcode; break; case TERMCODE_CONTROL: value = tio.c_cflag & mapcode; break; default: continue; } /* If we reach here, we have something to say */ buf_putbyte(ses.writepayload, sshcode); buf_putint(ses.writepayload, value); } buf_putbyte(ses.writepayload, 0); /* THE END, aka TTY_OP_END */ /* Put the string length at the start of the buffer */ bufpos2 = ses.writepayload->pos; buf_setpos(ses.writepayload, bufpos1); /* Jump back */ buf_putint(ses.writepayload, bufpos2 - bufpos1 - 4); /* len(termcodes) */ buf_setpos(ses.writepayload, bufpos2); /* Back where we were */ TRACE(("leave put_termcodes")); } static void put_winsize() { struct winsize ws; if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) < 0) { /* Some sane defaults */ ws.ws_row = 25; ws.ws_col = 80; ws.ws_xpixel = 0; ws.ws_ypixel = 0; } buf_putint(ses.writepayload, ws.ws_col); /* Cols */ buf_putint(ses.writepayload, ws.ws_row); /* Rows */ buf_putint(ses.writepayload, ws.ws_xpixel); /* Width */ buf_putint(ses.writepayload, ws.ws_ypixel); /* Height */ } static void sigwinch_handler(int dummy) { cli_ses.winchange = 1; } void cli_chansess_winchange() { unsigned int i; struct Channel *channel = NULL; for (i = 0; i < ses.chansize; i++) { channel = ses.channels[i]; if (channel != NULL && channel->type == &clichansess) { CHECKCLEARTOWRITE(); buf_putbyte(ses.writepayload, SSH_MSG_CHANNEL_REQUEST); buf_putint(ses.writepayload, channel->remotechan); buf_putstring(ses.writepayload, "window-change", 13); buf_putbyte(ses.writepayload, 0); /* FALSE says the spec */ put_winsize(); encrypt_packet(); } } cli_ses.winchange = 0; } static void send_chansess_pty_req(struct Channel *channel) { unsigned char* term = NULL; TRACE(("enter send_chansess_pty_req")); start_channel_request(channel, "pty-req"); /* Don't want replies */ buf_putbyte(ses.writepayload, 0); /* Get the terminal */ term = getenv("TERM"); if (term == NULL) { term = "vt100"; /* Seems a safe default */ } buf_putstring(ses.writepayload, term, strlen(term)); /* Window size */ put_winsize(); /* Terminal mode encoding */ put_termcodes(); encrypt_packet(); /* Set up a window-change handler */ if (signal(SIGWINCH, sigwinch_handler) == SIG_ERR) { dropbear_exit("signal error"); } TRACE(("leave send_chansess_pty_req")); } static void send_chansess_shell_req(struct Channel *channel) { unsigned char* reqtype = NULL; TRACE(("enter send_chansess_shell_req")); if (cli_opts.cmd) { reqtype = "exec"; } else { reqtype = "shell"; } start_channel_request(channel, reqtype); /* XXX TODO */ buf_putbyte(ses.writepayload, 0); /* Don't want replies */ if (cli_opts.cmd) { buf_putstring(ses.writepayload, cli_opts.cmd, strlen(cli_opts.cmd)); } encrypt_packet(); TRACE(("leave send_chansess_shell_req")); } static int cli_initchansess(struct Channel *channel) { channel->infd = STDOUT_FILENO; //channel->outfd = STDIN_FILENO; //channel->errfd = STDERR_FILENO; if (cli_opts.wantpty) { send_chansess_pty_req(channel); } send_chansess_shell_req(channel); if (cli_opts.wantpty) { cli_tty_setup(); } return 0; /* Success */ } void cli_send_chansess_request() { TRACE(("enter cli_send_chansess_request")); if (send_msg_channel_open_init(STDIN_FILENO, &clichansess) == DROPBEAR_FAILURE) { dropbear_exit("Couldn't open initial channel"); } /* No special channel request data */ encrypt_packet(); TRACE(("leave cli_send_chansess_request")); }