Mercurial > dropbear
annotate cli-chansession.c @ 1244:5b7cc2230de7
TravisCI: use `if` block
author | Chocobo1 <Chocobo1@users.noreply.github.com> |
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date | Tue, 05 Jan 2016 15:27:18 +0800 |
parents | aaf576b27a10 |
children | 7373b304868d |
rev | line source |
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1 /* |
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2 * Dropbear SSH |
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3 * |
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4 * Copyright (c) 2002,2003 Matt Johnston |
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5 * Copyright (c) 2004 by Mihnea Stoenescu |
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6 * All rights reserved. |
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7 * |
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8 * Permission is hereby granted, free of charge, to any person obtaining a copy |
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9 * of this software and associated documentation files (the "Software"), to deal |
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10 * in the Software without restriction, including without limitation the rights |
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11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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12 * copies of the Software, and to permit persons to whom the Software is |
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13 * furnished to do so, subject to the following conditions: |
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14 * |
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15 * The above copyright notice and this permission notice shall be included in |
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16 * all copies or substantial portions of the Software. |
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17 * |
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18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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21 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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24 * SOFTWARE. */ |
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25 |
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26 #include "includes.h" |
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27 #include "packet.h" |
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28 #include "buffer.h" |
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29 #include "session.h" |
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30 #include "dbutil.h" |
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31 #include "channel.h" |
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32 #include "ssh.h" |
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33 #include "runopts.h" |
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34 #include "termcodes.h" |
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35 #include "chansession.h" |
560 | 36 #include "agentfwd.h" |
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37 |
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38 static void cli_closechansess(struct Channel *channel); |
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39 static int cli_initchansess(struct Channel *channel); |
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40 static void cli_chansessreq(struct Channel *channel); |
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41 static void send_chansess_pty_req(struct Channel *channel); |
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42 static void send_chansess_shell_req(struct Channel *channel); |
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43 static void cli_escape_handler(struct Channel *channel, unsigned char* buf, int *len); |
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44 static int cli_init_netcat(struct Channel *channel); |
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45 |
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46 static void cli_tty_setup(); |
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47 |
107 | 48 const struct ChanType clichansess = { |
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49 0, /* sepfds */ |
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50 "session", /* name */ |
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51 cli_initchansess, /* inithandler */ |
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52 NULL, /* checkclosehandler */ |
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53 cli_chansessreq, /* reqhandler */ |
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54 cli_closechansess, /* closehandler */ |
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55 }; |
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56 |
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57 static void cli_chansessreq(struct Channel *channel) { |
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58 |
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59 char* type = NULL; |
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60 int wantreply; |
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61 |
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62 TRACE(("enter cli_chansessreq")) |
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63 |
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64 type = buf_getstring(ses.payload, NULL); |
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65 wantreply = buf_getbool(ses.payload); |
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66 |
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67 if (strcmp(type, "exit-status") == 0) { |
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68 cli_ses.retval = buf_getint(ses.payload); |
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69 TRACE(("got exit-status of '%d'", cli_ses.retval)) |
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70 } else if (strcmp(type, "exit-signal") == 0) { |
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71 TRACE(("got exit-signal, ignoring it")) |
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72 } else { |
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73 TRACE(("unknown request '%s'", type)) |
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74 if (wantreply) { |
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75 send_msg_channel_failure(channel); |
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76 } |
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77 goto out; |
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78 } |
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79 |
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80 out: |
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81 m_free(type); |
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82 } |
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83 |
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84 |
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85 /* If the main session goes, we close it up */ |
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86 static void cli_closechansess(struct Channel *UNUSED(channel)) { |
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87 cli_tty_cleanup(); /* Restore tty modes etc */ |
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88 |
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89 /* This channel hasn't gone yet, so we have > 1 */ |
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90 if (ses.chancount > 1) { |
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91 dropbear_log(LOG_INFO, "Waiting for other channels to close..."); |
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92 } |
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93 } |
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94 |
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95 /* Taken from OpenSSH's sshtty.c: |
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96 * RCSID("OpenBSD: sshtty.c,v 1.5 2003/09/19 17:43:35 markus Exp "); */ |
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97 static void cli_tty_setup() { |
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98 |
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99 struct termios tio; |
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100 |
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101 TRACE(("enter cli_pty_setup")) |
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102 |
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103 if (cli_ses.tty_raw_mode == 1) { |
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104 TRACE(("leave cli_tty_setup: already in raw mode!")) |
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105 return; |
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106 } |
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107 |
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108 if (tcgetattr(STDIN_FILENO, &tio) == -1) { |
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109 dropbear_exit("Failed to set raw TTY mode"); |
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110 } |
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111 |
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112 /* make a copy */ |
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113 cli_ses.saved_tio = tio; |
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114 |
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115 tio.c_iflag |= IGNPAR; |
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116 tio.c_iflag &= ~(ISTRIP | INLCR | IGNCR | ICRNL | IXON | IXANY | IXOFF); |
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117 #ifdef IUCLC |
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118 tio.c_iflag &= ~IUCLC; |
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119 #endif |
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120 tio.c_lflag &= ~(ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHONL); |
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121 #ifdef IEXTEN |
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122 tio.c_lflag &= ~IEXTEN; |
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123 #endif |
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124 tio.c_oflag &= ~OPOST; |
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125 tio.c_cc[VMIN] = 1; |
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126 tio.c_cc[VTIME] = 0; |
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127 if (tcsetattr(STDIN_FILENO, TCSADRAIN, &tio) == -1) { |
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128 dropbear_exit("Failed to set raw TTY mode"); |
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129 } |
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|
130 |
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131 cli_ses.tty_raw_mode = 1; |
165
0cfba3034be5
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132 TRACE(("leave cli_tty_setup")) |
39
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|
133 } |
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|
134 |
40
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diff
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|
135 void cli_tty_cleanup() { |
39
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136 |
165
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|
137 TRACE(("enter cli_tty_cleanup")) |
39
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|
138 |
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139 if (cli_ses.tty_raw_mode == 0) { |
165
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140 TRACE(("leave cli_tty_cleanup: not in raw mode")) |
40
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141 return; |
39
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|
142 } |
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|
143 |
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144 if (tcsetattr(STDIN_FILENO, TCSADRAIN, &cli_ses.saved_tio) == -1) { |
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145 dropbear_log(LOG_WARNING, "Failed restoring TTY"); |
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|
146 } else { |
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|
147 cli_ses.tty_raw_mode = 0; |
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148 } |
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149 |
165
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150 TRACE(("leave cli_tty_cleanup")) |
39
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151 } |
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152 |
40
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153 static void put_termcodes() { |
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154 |
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155 struct termios tio; |
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156 unsigned int sshcode; |
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157 const struct TermCode *termcode; |
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158 unsigned int value; |
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159 unsigned int mapcode; |
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160 |
311
36d21680a9d3
A few more fixups, make sure that variable declarations are the
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161 unsigned int bufpos1, bufpos2; |
300
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162 |
311
36d21680a9d3
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163 TRACE(("enter put_termcodes")) |
40
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164 |
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165 if (tcgetattr(STDIN_FILENO, &tio) == -1) { |
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166 dropbear_log(LOG_WARNING, "Failed reading termmodes"); |
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167 buf_putint(ses.writepayload, 1); /* Just the terminator */ |
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168 buf_putbyte(ses.writepayload, 0); /* TTY_OP_END */ |
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169 return; |
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|
170 } |
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171 |
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172 bufpos1 = ses.writepayload->pos; |
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173 buf_putint(ses.writepayload, 0); /* A placeholder for the final length */ |
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174 |
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175 /* As with Dropbear server, we ignore baud rates for now */ |
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176 for (sshcode = 1; sshcode < MAX_TERMCODE; sshcode++) { |
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177 |
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178 termcode = &termcodes[sshcode]; |
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179 mapcode = termcode->mapcode; |
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180 |
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181 switch (termcode->type) { |
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182 |
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183 case TERMCODE_NONE: |
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184 continue; |
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185 |
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186 case TERMCODE_CONTROLCHAR: |
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187 value = tio.c_cc[mapcode]; |
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188 break; |
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189 |
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190 case TERMCODE_INPUT: |
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191 value = tio.c_iflag & mapcode; |
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192 break; |
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193 |
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194 case TERMCODE_OUTPUT: |
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195 value = tio.c_oflag & mapcode; |
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196 break; |
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197 |
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198 case TERMCODE_LOCAL: |
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199 value = tio.c_lflag & mapcode; |
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diff
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|
200 break; |
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|
201 |
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202 case TERMCODE_CONTROL: |
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203 value = tio.c_cflag & mapcode; |
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diff
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|
204 break; |
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|
205 |
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|
206 default: |
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diff
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|
207 continue; |
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208 |
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|
209 } |
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210 |
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|
211 /* If we reach here, we have something to say */ |
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|
212 buf_putbyte(ses.writepayload, sshcode); |
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213 buf_putint(ses.writepayload, value); |
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|
214 } |
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215 |
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|
216 buf_putbyte(ses.writepayload, 0); /* THE END, aka TTY_OP_END */ |
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|
217 |
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218 /* Put the string length at the start of the buffer */ |
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|
219 bufpos2 = ses.writepayload->pos; |
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220 |
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diff
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|
221 buf_setpos(ses.writepayload, bufpos1); /* Jump back */ |
61
3a4f0ef1e8c3
Write the correct termcodes length
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41
diff
changeset
|
222 buf_putint(ses.writepayload, bufpos2 - bufpos1 - 4); /* len(termcodes) */ |
40
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diff
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|
223 buf_setpos(ses.writepayload, bufpos2); /* Back where we were */ |
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224 |
165
0cfba3034be5
Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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diff
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|
225 TRACE(("leave put_termcodes")) |
40
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|
226 } |
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|
227 |
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diff
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|
228 static void put_winsize() { |
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229 |
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diff
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|
230 struct winsize ws; |
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|
231 |
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diff
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|
232 if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) < 0) { |
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diff
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|
233 /* Some sane defaults */ |
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diff
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|
234 ws.ws_row = 25; |
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diff
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|
235 ws.ws_col = 80; |
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diff
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|
236 ws.ws_xpixel = 0; |
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diff
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|
237 ws.ws_ypixel = 0; |
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|
238 } |
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|
239 |
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diff
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|
240 buf_putint(ses.writepayload, ws.ws_col); /* Cols */ |
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39
diff
changeset
|
241 buf_putint(ses.writepayload, ws.ws_row); /* Rows */ |
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diff
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|
242 buf_putint(ses.writepayload, ws.ws_xpixel); /* Width */ |
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diff
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|
243 buf_putint(ses.writepayload, ws.ws_ypixel); /* Height */ |
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|
244 |
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diff
changeset
|
245 } |
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|
246 |
108
10f4d3319780
- added circular buffering for channels
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107
diff
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|
247 static void sigwinch_handler(int UNUSED(unused)) { |
41
18eccbfb9641
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40
diff
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|
248 |
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added window-size change handling
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diff
changeset
|
249 cli_ses.winchange = 1; |
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250 |
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251 } |
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252 |
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253 void cli_chansess_winchange() { |
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254 |
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255 unsigned int i; |
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256 struct Channel *channel = NULL; |
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257 |
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258 for (i = 0; i < ses.chansize; i++) { |
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259 channel = ses.channels[i]; |
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260 if (channel != NULL && channel->type == &clichansess) { |
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261 CHECKCLEARTOWRITE(); |
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262 buf_putbyte(ses.writepayload, SSH_MSG_CHANNEL_REQUEST); |
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263 buf_putint(ses.writepayload, channel->remotechan); |
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264 buf_putstring(ses.writepayload, "window-change", 13); |
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265 buf_putbyte(ses.writepayload, 0); /* FALSE says the spec */ |
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266 put_winsize(); |
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267 encrypt_packet(); |
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268 } |
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269 } |
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270 cli_ses.winchange = 0; |
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271 } |
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272 |
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273 static void send_chansess_pty_req(struct Channel *channel) { |
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274 |
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275 char* term = NULL; |
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276 |
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277 TRACE(("enter send_chansess_pty_req")) |
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278 |
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279 start_send_channel_request(channel, "pty-req"); |
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280 |
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281 /* Don't want replies */ |
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282 buf_putbyte(ses.writepayload, 0); |
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283 |
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284 /* Get the terminal */ |
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285 term = getenv("TERM"); |
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286 if (term == NULL) { |
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287 term = "vt100"; /* Seems a safe default */ |
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288 } |
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289 buf_putstring(ses.writepayload, term, strlen(term)); |
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290 |
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291 /* Window size */ |
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292 put_winsize(); |
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293 |
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294 /* Terminal mode encoding */ |
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295 put_termcodes(); |
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296 |
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297 encrypt_packet(); |
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298 |
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299 /* Set up a window-change handler */ |
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300 if (signal(SIGWINCH, sigwinch_handler) == SIG_ERR) { |
594
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301 dropbear_exit("Signal error"); |
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302 } |
165
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303 TRACE(("leave send_chansess_pty_req")) |
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304 } |
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305 |
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306 static void send_chansess_shell_req(struct Channel *channel) { |
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307 |
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308 char* reqtype = NULL; |
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309 |
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310 TRACE(("enter send_chansess_shell_req")) |
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311 |
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312 if (cli_opts.cmd) { |
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313 if (cli_opts.is_subsystem) { |
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314 reqtype = "subsystem"; |
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315 } else { |
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316 reqtype = "exec"; |
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317 } |
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318 } else { |
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319 reqtype = "shell"; |
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320 } |
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321 |
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322 start_send_channel_request(channel, reqtype); |
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323 |
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324 /* XXX TODO */ |
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325 buf_putbyte(ses.writepayload, 0); /* Don't want replies */ |
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326 if (cli_opts.cmd) { |
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327 buf_putstring(ses.writepayload, cli_opts.cmd, strlen(cli_opts.cmd)); |
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328 } |
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329 |
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330 encrypt_packet(); |
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331 TRACE(("leave send_chansess_shell_req")) |
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332 } |
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333 |
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334 /* Shared for normal client channel and netcat-alike */ |
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335 static int cli_init_stdpipe_sess(struct Channel *channel) { |
253
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336 channel->writefd = STDOUT_FILENO; |
109
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337 setnonblocking(STDOUT_FILENO); |
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338 |
253
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339 channel->readfd = STDIN_FILENO; |
109
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340 setnonblocking(STDIN_FILENO); |
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341 |
107 | 342 channel->errfd = STDERR_FILENO; |
109
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343 setnonblocking(STDERR_FILENO); |
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344 |
449
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345 channel->extrabuf = cbuf_new(opts.recv_window); |
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346 return 0; |
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347 } |
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348 |
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349 static int cli_init_netcat(struct Channel *channel) { |
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350 channel->prio = DROPBEAR_CHANNEL_PRIO_UNKNOWABLE; |
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351 return cli_init_stdpipe_sess(channel); |
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352 } |
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353 |
485
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354 static int cli_initchansess(struct Channel *channel) { |
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355 |
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356 cli_init_stdpipe_sess(channel); |
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357 |
560 | 358 #ifdef ENABLE_CLI_AGENTFWD |
359 if (cli_opts.agent_fwd) { | |
360 cli_setup_agent(channel); | |
361 } | |
362 #endif | |
363 | |
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364 if (cli_opts.wantpty) { |
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365 send_chansess_pty_req(channel); |
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366 channel->prio = DROPBEAR_CHANNEL_PRIO_INTERACTIVE; |
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367 } else { |
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368 channel->prio = DROPBEAR_CHANNEL_PRIO_BULK; |
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369 } |
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370 |
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371 send_chansess_shell_req(channel); |
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372 |
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373 if (cli_opts.wantpty) { |
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374 cli_tty_setup(); |
722
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375 channel->read_mangler = cli_escape_handler; |
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376 cli_ses.last_char = '\r'; |
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377 } |
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378 |
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379 return 0; /* Success */ |
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380 } |
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381 |
485
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382 #ifdef ENABLE_CLI_NETCAT |
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383 |
582 | 384 static const struct ChanType cli_chan_netcat = { |
564
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385 0, /* sepfds */ |
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386 "direct-tcpip", |
941
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387 cli_init_netcat, /* inithandler */ |
564
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388 NULL, |
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389 NULL, |
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390 cli_closechansess |
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391 }; |
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392 |
485
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393 void cli_send_netcat_request() { |
39
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394 |
1094
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Fix pointer differ in signess warnings [-Werror=pointer-sign]
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395 const char* source_host = "127.0.0.1"; |
485
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396 const int source_port = 22; |
296
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397 |
872
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398 TRACE(("enter cli_send_netcat_request")) |
485
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399 cli_opts.wantpty = 0; |
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400 |
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401 if (send_msg_channel_open_init(STDIN_FILENO, &cli_chan_netcat) |
39
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402 == DROPBEAR_FAILURE) { |
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403 dropbear_exit("Couldn't open initial channel"); |
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404 } |
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405 |
1122
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406 buf_putstring(ses.writepayload, cli_opts.netcat_host, |
485
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407 strlen(cli_opts.netcat_host)); |
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408 buf_putint(ses.writepayload, cli_opts.netcat_port); |
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409 |
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410 /* originator ip - localhost is accurate enough */ |
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411 buf_putstring(ses.writepayload, source_host, strlen(source_host)); |
485
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412 buf_putint(ses.writepayload, source_port); |
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413 |
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414 encrypt_packet(); |
872
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415 TRACE(("leave cli_send_netcat_request")) |
485
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416 } |
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417 #endif |
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418 |
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419 void cli_send_chansess_request() { |
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420 |
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421 TRACE(("enter cli_send_chansess_request")) |
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422 |
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423 if (send_msg_channel_open_init(STDIN_FILENO, &clichansess) |
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424 == DROPBEAR_FAILURE) { |
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425 dropbear_exit("Couldn't open initial channel"); |
296
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426 } |
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427 |
485
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428 /* No special channel request data */ |
39
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429 encrypt_packet(); |
165
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Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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|
430 TRACE(("leave cli_send_chansess_request")) |
39
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431 |
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432 } |
722
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433 |
857 | 434 /* returns 1 if the character should be consumed, 0 to pass through */ |
722
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435 static int |
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|
436 do_escape(unsigned char c) { |
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437 switch (c) { |
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438 case '.': |
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439 dropbear_exit("Terminated"); |
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440 return 1; |
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441 break; |
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442 case 0x1a: |
857 | 443 /* ctrl-z */ |
722
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444 cli_tty_cleanup(); |
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|
445 kill(getpid(), SIGTSTP); |
857 | 446 /* after continuation */ |
722
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|
447 cli_tty_setup(); |
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|
448 cli_ses.winchange = 1; |
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449 return 1; |
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|
450 break; |
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|
451 } |
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452 return 0; |
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|
453 } |
4a274f47eabd
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|
454 |
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changeset
|
455 static |
761
ac2158e3e403
ecc kind of works, needs fixing/testing
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722
diff
changeset
|
456 void cli_escape_handler(struct Channel* UNUSED(channel), unsigned char* buf, int *len) { |
722
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|
457 char c; |
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|
458 int skip_char = 0; |
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|
459 |
857 | 460 /* only handle escape characters if they are read one at a time. simplifies |
461 the code and avoids nasty people putting ~. at the start of a line to paste */ | |
722
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|
462 if (*len != 1) { |
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changeset
|
463 cli_ses.last_char = 0x0; |
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|
464 return; |
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|
465 } |
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changeset
|
466 |
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|
467 c = buf[0]; |
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changeset
|
468 |
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changeset
|
469 if (cli_ses.last_char == DROPBEAR_ESCAPE_CHAR) { |
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|
470 skip_char = do_escape(c); |
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changeset
|
471 cli_ses.last_char = 0x0; |
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|
472 } else { |
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changeset
|
473 if (c == DROPBEAR_ESCAPE_CHAR) { |
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changeset
|
474 if (cli_ses.last_char == '\r') { |
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changeset
|
475 cli_ses.last_char = DROPBEAR_ESCAPE_CHAR; |
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changeset
|
476 skip_char = 1; |
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changeset
|
477 } else { |
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changeset
|
478 cli_ses.last_char = 0x0; |
4a274f47eabd
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diff
changeset
|
479 } |
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|
480 } else { |
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changeset
|
481 cli_ses.last_char = c; |
4a274f47eabd
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diff
changeset
|
482 } |
4a274f47eabd
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parents:
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diff
changeset
|
483 } |
4a274f47eabd
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diff
changeset
|
484 |
4a274f47eabd
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changeset
|
485 if (skip_char) { |
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changeset
|
486 *len = 0; |
4a274f47eabd
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changeset
|
487 } |
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|
488 } |