Mercurial > dropbear
annotate cli-chansession.c @ 341:2eb5a8514905
Make flow of execution clearer for getting process exit status
author | Matt Johnston <matt@ucc.asn.au> |
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date | Fri, 07 Jul 2006 09:18:05 +0000 |
parents | 36d21680a9d3 |
children | a9e0ddac5ba7 |
rev | line source |
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74
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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 |
39
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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" |
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36 |
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37 static void cli_closechansess(struct Channel *channel); |
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38 static int cli_initchansess(struct Channel *channel); |
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39 static void cli_chansessreq(struct Channel *channel); |
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40 |
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41 static void start_channel_request(struct Channel *channel, unsigned char *type); |
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42 |
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43 static void send_chansess_pty_req(struct Channel *channel); |
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44 static void send_chansess_shell_req(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 unsigned 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 TRACE(("unknown request '%s'", type)) |
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69 send_msg_channel_failure(channel); |
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70 goto out; |
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71 } |
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72 |
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73 /* We'll just trust what they tell us */ |
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74 cli_ses.retval = buf_getint(ses.payload); |
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75 TRACE(("got exit-status of '%d'", cli_ses.retval)) |
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76 |
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77 out: |
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78 m_free(type); |
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79 } |
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80 |
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81 |
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82 /* If the main session goes, we close it up */ |
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83 static void cli_closechansess(struct Channel *UNUSED(channel)) { |
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84 |
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85 /* This channel hasn't gone yet, so we have > 1 */ |
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86 if (ses.chancount > 1) { |
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87 dropbear_log(LOG_INFO, "Waiting for other channels to close..."); |
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88 } |
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89 |
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90 cli_tty_cleanup(); /* Restore tty modes etc */ |
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91 |
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92 } |
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93 |
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94 static void start_channel_request(struct Channel *channel, |
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95 unsigned char *type) { |
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96 |
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97 CHECKCLEARTOWRITE(); |
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98 buf_putbyte(ses.writepayload, SSH_MSG_CHANNEL_REQUEST); |
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99 buf_putint(ses.writepayload, channel->remotechan); |
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100 |
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101 buf_putstring(ses.writepayload, type, strlen(type)); |
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102 |
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103 } |
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104 |
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105 /* Taken from OpenSSH's sshtty.c: |
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106 * RCSID("OpenBSD: sshtty.c,v 1.5 2003/09/19 17:43:35 markus Exp "); */ |
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107 static void cli_tty_setup() { |
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108 |
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109 struct termios tio; |
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110 |
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111 TRACE(("enter cli_pty_setup")) |
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112 |
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113 if (cli_ses.tty_raw_mode == 1) { |
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114 TRACE(("leave cli_tty_setup: already in raw mode!")) |
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115 return; |
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116 } |
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117 |
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118 if (tcgetattr(STDIN_FILENO, &tio) == -1) { |
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119 dropbear_exit("Failed to set raw TTY mode"); |
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120 } |
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121 |
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122 /* make a copy */ |
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123 cli_ses.saved_tio = tio; |
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124 |
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125 tio.c_iflag |= IGNPAR; |
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126 tio.c_iflag &= ~(ISTRIP | INLCR | IGNCR | ICRNL | IXON | IXANY | IXOFF); |
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127 #ifdef IUCLC |
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128 tio.c_iflag &= ~IUCLC; |
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129 #endif |
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130 tio.c_lflag &= ~(ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHONL); |
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131 #ifdef IEXTEN |
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132 tio.c_lflag &= ~IEXTEN; |
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133 #endif |
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134 tio.c_oflag &= ~OPOST; |
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135 tio.c_cc[VMIN] = 1; |
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136 tio.c_cc[VTIME] = 0; |
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137 if (tcsetattr(STDIN_FILENO, TCSADRAIN, &tio) == -1) { |
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138 dropbear_exit("Failed to set raw TTY mode"); |
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139 } |
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140 |
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141 cli_ses.tty_raw_mode = 1; |
165
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142 TRACE(("leave cli_tty_setup")) |
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143 } |
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144 |
40
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145 void cli_tty_cleanup() { |
39
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146 |
165
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147 TRACE(("enter cli_tty_cleanup")) |
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148 |
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149 if (cli_ses.tty_raw_mode == 0) { |
165
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150 TRACE(("leave cli_tty_cleanup: not in raw mode")) |
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151 return; |
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152 } |
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153 |
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154 if (tcsetattr(STDIN_FILENO, TCSADRAIN, &cli_ses.saved_tio) == -1) { |
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155 dropbear_log(LOG_WARNING, "Failed restoring TTY"); |
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156 } else { |
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157 cli_ses.tty_raw_mode = 0; |
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158 } |
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159 |
165
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160 TRACE(("leave cli_tty_cleanup")) |
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161 } |
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162 |
40
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163 static void put_termcodes() { |
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164 |
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165 struct termios tio; |
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166 unsigned int sshcode; |
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167 const struct TermCode *termcode; |
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168 unsigned int value; |
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169 unsigned int mapcode; |
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170 |
311
36d21680a9d3
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171 unsigned int bufpos1, bufpos2; |
300
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172 |
311
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173 TRACE(("enter put_termcodes")) |
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174 |
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175 if (tcgetattr(STDIN_FILENO, &tio) == -1) { |
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176 dropbear_log(LOG_WARNING, "Failed reading termmodes"); |
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177 buf_putint(ses.writepayload, 1); /* Just the terminator */ |
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178 buf_putbyte(ses.writepayload, 0); /* TTY_OP_END */ |
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179 return; |
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180 } |
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181 |
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182 bufpos1 = ses.writepayload->pos; |
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183 buf_putint(ses.writepayload, 0); /* A placeholder for the final length */ |
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184 |
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185 /* As with Dropbear server, we ignore baud rates for now */ |
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186 for (sshcode = 1; sshcode < MAX_TERMCODE; sshcode++) { |
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187 |
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188 termcode = &termcodes[sshcode]; |
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189 mapcode = termcode->mapcode; |
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190 |
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191 switch (termcode->type) { |
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192 |
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193 case TERMCODE_NONE: |
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194 continue; |
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195 |
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196 case TERMCODE_CONTROLCHAR: |
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197 value = tio.c_cc[mapcode]; |
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198 break; |
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199 |
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200 case TERMCODE_INPUT: |
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201 value = tio.c_iflag & mapcode; |
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202 break; |
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203 |
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204 case TERMCODE_OUTPUT: |
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205 value = tio.c_oflag & mapcode; |
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206 break; |
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207 |
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208 case TERMCODE_LOCAL: |
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209 value = tio.c_lflag & mapcode; |
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210 break; |
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211 |
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212 case TERMCODE_CONTROL: |
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213 value = tio.c_cflag & mapcode; |
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|
214 break; |
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215 |
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216 default: |
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|
217 continue; |
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218 |
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|
219 } |
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220 |
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221 /* If we reach here, we have something to say */ |
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222 buf_putbyte(ses.writepayload, sshcode); |
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223 buf_putint(ses.writepayload, value); |
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224 } |
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225 |
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226 buf_putbyte(ses.writepayload, 0); /* THE END, aka TTY_OP_END */ |
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227 |
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228 /* Put the string length at the start of the buffer */ |
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229 bufpos2 = ses.writepayload->pos; |
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230 |
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231 buf_setpos(ses.writepayload, bufpos1); /* Jump back */ |
61
3a4f0ef1e8c3
Write the correct termcodes length
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41
diff
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|
232 buf_putint(ses.writepayload, bufpos2 - bufpos1 - 4); /* len(termcodes) */ |
40
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233 buf_setpos(ses.writepayload, bufpos2); /* Back where we were */ |
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234 |
165
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|
235 TRACE(("leave put_termcodes")) |
40
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|
236 } |
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237 |
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|
238 static void put_winsize() { |
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|
239 |
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|
240 struct winsize ws; |
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|
241 |
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|
242 if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) < 0) { |
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|
243 /* Some sane defaults */ |
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244 ws.ws_row = 25; |
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245 ws.ws_col = 80; |
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|
246 ws.ws_xpixel = 0; |
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247 ws.ws_ypixel = 0; |
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|
248 } |
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|
249 |
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|
250 buf_putint(ses.writepayload, ws.ws_col); /* Cols */ |
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|
251 buf_putint(ses.writepayload, ws.ws_row); /* Rows */ |
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|
252 buf_putint(ses.writepayload, ws.ws_xpixel); /* Width */ |
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39
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253 buf_putint(ses.writepayload, ws.ws_ypixel); /* Height */ |
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254 |
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255 } |
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256 |
108
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257 static void sigwinch_handler(int UNUSED(unused)) { |
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258 |
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259 cli_ses.winchange = 1; |
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260 |
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261 } |
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262 |
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263 void cli_chansess_winchange() { |
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264 |
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265 unsigned int i; |
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266 struct Channel *channel = NULL; |
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267 |
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268 for (i = 0; i < ses.chansize; i++) { |
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269 channel = ses.channels[i]; |
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270 if (channel != NULL && channel->type == &clichansess) { |
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271 CHECKCLEARTOWRITE(); |
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272 buf_putbyte(ses.writepayload, SSH_MSG_CHANNEL_REQUEST); |
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273 buf_putint(ses.writepayload, channel->remotechan); |
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274 buf_putstring(ses.writepayload, "window-change", 13); |
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275 buf_putbyte(ses.writepayload, 0); /* FALSE says the spec */ |
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276 put_winsize(); |
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277 encrypt_packet(); |
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278 } |
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279 } |
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280 cli_ses.winchange = 0; |
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281 } |
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282 |
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283 static void send_chansess_pty_req(struct Channel *channel) { |
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284 |
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285 unsigned char* term = NULL; |
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286 |
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287 TRACE(("enter send_chansess_pty_req")) |
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288 |
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289 start_channel_request(channel, "pty-req"); |
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290 |
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291 /* Don't want replies */ |
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292 buf_putbyte(ses.writepayload, 0); |
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293 |
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294 /* Get the terminal */ |
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295 term = getenv("TERM"); |
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296 if (term == NULL) { |
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297 term = "vt100"; /* Seems a safe default */ |
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298 } |
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299 buf_putstring(ses.writepayload, term, strlen(term)); |
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300 |
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301 /* Window size */ |
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302 put_winsize(); |
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303 |
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304 /* Terminal mode encoding */ |
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305 put_termcodes(); |
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306 |
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307 encrypt_packet(); |
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308 |
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309 /* Set up a window-change handler */ |
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310 if (signal(SIGWINCH, sigwinch_handler) == SIG_ERR) { |
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311 dropbear_exit("signal error"); |
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312 } |
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313 TRACE(("leave send_chansess_pty_req")) |
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314 } |
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315 |
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316 static void send_chansess_shell_req(struct Channel *channel) { |
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317 |
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318 unsigned char* reqtype = NULL; |
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319 |
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320 TRACE(("enter send_chansess_shell_req")) |
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321 |
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322 if (cli_opts.cmd) { |
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323 reqtype = "exec"; |
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324 } else { |
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325 reqtype = "shell"; |
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326 } |
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327 |
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328 start_channel_request(channel, reqtype); |
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329 |
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330 /* XXX TODO */ |
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331 buf_putbyte(ses.writepayload, 0); /* Don't want replies */ |
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332 if (cli_opts.cmd) { |
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333 buf_putstring(ses.writepayload, cli_opts.cmd, strlen(cli_opts.cmd)); |
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334 } |
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335 |
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336 encrypt_packet(); |
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337 TRACE(("leave send_chansess_shell_req")) |
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338 } |
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339 |
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340 static int cli_initchansess(struct Channel *channel) { |
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341 |
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342 |
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343 channel->writefd = STDOUT_FILENO; |
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344 setnonblocking(STDOUT_FILENO); |
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345 |
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346 channel->readfd = STDIN_FILENO; |
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347 setnonblocking(STDIN_FILENO); |
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348 |
107 | 349 channel->errfd = STDERR_FILENO; |
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350 setnonblocking(STDERR_FILENO); |
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351 |
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352 channel->extrabuf = cbuf_new(RECV_MAXWINDOW); |
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353 |
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354 if (cli_opts.wantpty) { |
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355 send_chansess_pty_req(channel); |
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356 } |
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357 |
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358 send_chansess_shell_req(channel); |
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359 |
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360 if (cli_opts.wantpty) { |
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361 cli_tty_setup(); |
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362 } |
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363 |
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364 return 0; /* Success */ |
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365 |
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366 } |
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367 |
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368 void cli_send_chansess_request() { |
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369 |
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370 TRACE(("enter cli_send_chansess_request")) |
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371 if (send_msg_channel_open_init(STDIN_FILENO, &clichansess) |
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372 == DROPBEAR_FAILURE) { |
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373 dropbear_exit("Couldn't open initial channel"); |
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374 } |
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375 |
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376 /* No special channel request data */ |
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377 encrypt_packet(); |
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378 TRACE(("leave cli_send_chansess_request")) |
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379 |
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380 } |