Mercurial > dropbear
annotate cli-chansession.c @ 64:efb5e0b335cf
TCP forwarding works.
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 12 Aug 2004 13:48:42 +0000 |
parents | 3a4f0ef1e8c3 |
children | e3adf4cf5465 |
rev | line source |
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1 #include "includes.h" |
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2 #include "packet.h" |
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3 #include "buffer.h" |
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4 #include "session.h" |
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5 #include "dbutil.h" |
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6 #include "channel.h" |
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7 #include "ssh.h" |
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8 #include "runopts.h" |
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9 #include "termcodes.h" |
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10 |
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11 static void cli_closechansess(struct Channel *channel); |
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12 static int cli_initchansess(struct Channel *channel); |
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13 |
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14 static void start_channel_request(struct Channel *channel, unsigned char *type); |
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15 |
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16 static void send_chansess_pty_req(struct Channel *channel); |
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17 static void send_chansess_shell_req(struct Channel *channel); |
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18 |
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19 static void cli_tty_setup(); |
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20 void cli_tty_cleanup(); |
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21 |
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22 static const struct ChanType clichansess = { |
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23 0, /* sepfds */ |
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24 "session", /* name */ |
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25 cli_initchansess, /* inithandler */ |
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26 NULL, /* checkclosehandler */ |
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27 NULL, /* reqhandler */ |
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28 cli_closechansess, /* closehandler */ |
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29 }; |
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30 |
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31 /* If the main session goes, we close it up */ |
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32 static void cli_closechansess(struct Channel *channel) { |
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33 |
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34 /* This channel hasn't gone yet, so we have > 1 */ |
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35 if (ses.chancount > 1) { |
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36 dropbear_log(LOG_INFO, "Waiting for other channels to close..."); |
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37 } |
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38 |
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39 cli_tty_cleanup(); /* Restore tty modes etc */ |
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40 |
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41 } |
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42 |
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43 static void start_channel_request(struct Channel *channel, |
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44 unsigned char *type) { |
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45 |
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46 CHECKCLEARTOWRITE(); |
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47 buf_putbyte(ses.writepayload, SSH_MSG_CHANNEL_REQUEST); |
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48 buf_putint(ses.writepayload, channel->remotechan); |
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49 |
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50 buf_putstring(ses.writepayload, type, strlen(type)); |
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51 |
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52 } |
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53 |
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54 /* Taken from OpenSSH's sshtty.c: |
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55 * RCSID("OpenBSD: sshtty.c,v 1.5 2003/09/19 17:43:35 markus Exp "); */ |
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56 static void cli_tty_setup() { |
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57 |
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58 struct termios tio; |
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59 |
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60 TRACE(("enter cli_pty_setup")); |
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61 |
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62 if (cli_ses.tty_raw_mode == 1) { |
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63 TRACE(("leave cli_tty_setup: already in raw mode!")); |
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64 return; |
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65 } |
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66 |
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67 if (tcgetattr(STDIN_FILENO, &tio) == -1) { |
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68 dropbear_exit("Failed to set raw TTY mode"); |
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69 } |
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70 |
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71 /* make a copy */ |
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72 cli_ses.saved_tio = tio; |
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73 |
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74 tio.c_iflag |= IGNPAR; |
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75 tio.c_iflag &= ~(ISTRIP | INLCR | IGNCR | ICRNL | IXON | IXANY | IXOFF); |
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76 #ifdef IUCLC |
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77 tio.c_iflag &= ~IUCLC; |
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78 #endif |
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79 tio.c_lflag &= ~(ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHONL); |
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80 #ifdef IEXTEN |
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81 tio.c_lflag &= ~IEXTEN; |
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82 #endif |
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83 tio.c_oflag &= ~OPOST; |
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84 tio.c_cc[VMIN] = 1; |
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85 tio.c_cc[VTIME] = 0; |
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86 if (tcsetattr(STDIN_FILENO, TCSADRAIN, &tio) == -1) { |
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87 dropbear_exit("Failed to set raw TTY mode"); |
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88 } |
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89 |
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90 cli_ses.tty_raw_mode = 1; |
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91 TRACE(("leave cli_tty_setup")); |
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92 } |
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93 |
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94 void cli_tty_cleanup() { |
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95 |
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96 TRACE(("enter cli_tty_cleanup")); |
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97 |
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98 if (cli_ses.tty_raw_mode == 0) { |
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99 TRACE(("leave cli_tty_cleanup: not in raw mode")); |
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100 return; |
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101 } |
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102 |
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103 if (tcsetattr(STDIN_FILENO, TCSADRAIN, &cli_ses.saved_tio) == -1) { |
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104 dropbear_log(LOG_WARNING, "Failed restoring TTY"); |
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105 } else { |
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106 cli_ses.tty_raw_mode = 0; |
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107 } |
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108 |
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109 TRACE(("leave cli_tty_cleanup")); |
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110 } |
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111 |
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112 static void put_termcodes() { |
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113 |
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114 TRACE(("enter put_termcodes")); |
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115 |
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116 struct termios tio; |
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117 unsigned int sshcode; |
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118 const struct TermCode *termcode; |
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119 unsigned int value; |
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120 unsigned int mapcode; |
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121 |
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122 unsigned int bufpos1, bufpos2; |
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123 |
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124 if (tcgetattr(STDIN_FILENO, &tio) == -1) { |
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125 dropbear_log(LOG_WARNING, "Failed reading termmodes"); |
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126 buf_putint(ses.writepayload, 1); /* Just the terminator */ |
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127 buf_putbyte(ses.writepayload, 0); /* TTY_OP_END */ |
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128 return; |
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129 } |
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130 |
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131 bufpos1 = ses.writepayload->pos; |
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132 buf_putint(ses.writepayload, 0); /* A placeholder for the final length */ |
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133 |
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134 /* As with Dropbear server, we ignore baud rates for now */ |
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135 for (sshcode = 1; sshcode < MAX_TERMCODE; sshcode++) { |
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136 |
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137 termcode = &termcodes[sshcode]; |
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138 mapcode = termcode->mapcode; |
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139 |
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140 switch (termcode->type) { |
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141 |
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142 case TERMCODE_NONE: |
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143 continue; |
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144 |
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145 case TERMCODE_CONTROLCHAR: |
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146 value = tio.c_cc[mapcode]; |
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147 break; |
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148 |
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149 case TERMCODE_INPUT: |
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150 value = tio.c_iflag & mapcode; |
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151 break; |
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152 |
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153 case TERMCODE_OUTPUT: |
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154 value = tio.c_oflag & mapcode; |
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155 break; |
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156 |
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157 case TERMCODE_LOCAL: |
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158 value = tio.c_lflag & mapcode; |
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159 break; |
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160 |
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161 case TERMCODE_CONTROL: |
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162 value = tio.c_cflag & mapcode; |
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163 break; |
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164 |
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165 default: |
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166 continue; |
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167 |
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168 } |
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169 |
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170 /* If we reach here, we have something to say */ |
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171 buf_putbyte(ses.writepayload, sshcode); |
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172 buf_putint(ses.writepayload, value); |
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173 } |
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174 |
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175 buf_putbyte(ses.writepayload, 0); /* THE END, aka TTY_OP_END */ |
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176 |
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177 /* Put the string length at the start of the buffer */ |
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178 bufpos2 = ses.writepayload->pos; |
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179 |
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180 buf_setpos(ses.writepayload, bufpos1); /* Jump back */ |
61
3a4f0ef1e8c3
Write the correct termcodes length
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181 buf_putint(ses.writepayload, bufpos2 - bufpos1 - 4); /* len(termcodes) */ |
40
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182 buf_setpos(ses.writepayload, bufpos2); /* Back where we were */ |
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183 |
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184 TRACE(("leave put_termcodes")); |
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185 } |
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186 |
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187 static void put_winsize() { |
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188 |
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189 struct winsize ws; |
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190 |
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191 if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) < 0) { |
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192 /* Some sane defaults */ |
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193 ws.ws_row = 25; |
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194 ws.ws_col = 80; |
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195 ws.ws_xpixel = 0; |
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196 ws.ws_ypixel = 0; |
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197 } |
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198 |
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199 buf_putint(ses.writepayload, ws.ws_col); /* Cols */ |
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200 buf_putint(ses.writepayload, ws.ws_row); /* Rows */ |
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201 buf_putint(ses.writepayload, ws.ws_xpixel); /* Width */ |
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202 buf_putint(ses.writepayload, ws.ws_ypixel); /* Height */ |
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203 |
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|
204 } |
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205 |
41
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diff
changeset
|
206 static void sigwinch_handler(int dummy) { |
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207 |
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|
208 cli_ses.winchange = 1; |
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|
209 |
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|
210 } |
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|
211 |
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|
212 void cli_chansess_winchange() { |
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|
213 |
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|
214 unsigned int i; |
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|
215 struct Channel *channel = NULL; |
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216 |
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217 for (i = 0; i < ses.chansize; i++) { |
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218 channel = ses.channels[i]; |
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219 if (channel != NULL && channel->type == &clichansess) { |
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220 CHECKCLEARTOWRITE(); |
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diff
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|
221 buf_putbyte(ses.writepayload, SSH_MSG_CHANNEL_REQUEST); |
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diff
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|
222 buf_putint(ses.writepayload, channel->remotechan); |
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223 buf_putstring(ses.writepayload, "window-change", 13); |
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diff
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224 buf_putbyte(ses.writepayload, 0); /* FALSE says the spec */ |
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diff
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|
225 put_winsize(); |
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diff
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|
226 encrypt_packet(); |
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|
227 } |
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|
228 } |
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229 cli_ses.winchange = 0; |
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230 } |
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231 |
39
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232 static void send_chansess_pty_req(struct Channel *channel) { |
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233 |
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234 unsigned char* term = NULL; |
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235 |
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236 TRACE(("enter send_chansess_pty_req")); |
40
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237 |
39
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238 start_channel_request(channel, "pty-req"); |
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239 |
40
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240 /* Don't want replies */ |
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diff
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241 buf_putbyte(ses.writepayload, 0); |
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242 |
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243 /* Get the terminal */ |
39
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244 term = getenv("TERM"); |
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245 if (term == NULL) { |
40
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diff
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246 term = "vt100"; /* Seems a safe default */ |
39
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247 } |
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248 buf_putstring(ses.writepayload, term, strlen(term)); |
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249 |
40
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250 /* Window size */ |
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251 put_winsize(); |
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252 |
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253 /* Terminal mode encoding */ |
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diff
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|
254 put_termcodes(); |
39
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255 |
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|
256 encrypt_packet(); |
41
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257 |
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258 /* Set up a window-change handler */ |
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259 if (signal(SIGWINCH, sigwinch_handler) == SIG_ERR) { |
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260 dropbear_exit("signal error"); |
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|
261 } |
39
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262 TRACE(("leave send_chansess_pty_req")); |
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263 } |
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264 |
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265 static void send_chansess_shell_req(struct Channel *channel) { |
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266 |
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267 unsigned char* reqtype = NULL; |
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268 |
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269 TRACE(("enter send_chansess_shell_req")); |
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270 |
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271 if (cli_opts.cmd) { |
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272 reqtype = "exec"; |
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273 } else { |
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274 reqtype = "shell"; |
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275 } |
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276 |
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277 start_channel_request(channel, reqtype); |
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278 |
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279 /* XXX TODO */ |
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280 buf_putbyte(ses.writepayload, 0); /* Don't want replies */ |
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281 if (cli_opts.cmd) { |
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282 buf_putstring(ses.writepayload, cli_opts.cmd, strlen(cli_opts.cmd)); |
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283 } |
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284 |
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285 encrypt_packet(); |
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286 TRACE(("leave send_chansess_shell_req")); |
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287 } |
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288 |
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289 static int cli_initchansess(struct Channel *channel) { |
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290 |
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291 channel->infd = STDOUT_FILENO; |
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292 //channel->outfd = STDIN_FILENO; |
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293 //channel->errfd = STDERR_FILENO; |
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294 |
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295 if (cli_opts.wantpty) { |
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296 send_chansess_pty_req(channel); |
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297 } |
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298 |
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299 send_chansess_shell_req(channel); |
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300 |
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301 if (cli_opts.wantpty) { |
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302 cli_tty_setup(); |
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303 } |
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304 |
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305 return 0; /* Success */ |
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306 |
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307 } |
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308 |
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309 void cli_send_chansess_request() { |
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310 |
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311 TRACE(("enter cli_send_chansess_request")); |
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312 if (send_msg_channel_open_init(STDIN_FILENO, &clichansess) |
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313 == DROPBEAR_FAILURE) { |
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314 dropbear_exit("Couldn't open initial channel"); |
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315 } |
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316 |
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317 /* No special channel request data */ |
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318 encrypt_packet(); |
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319 TRACE(("leave cli_send_chansess_request")); |
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320 |
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321 } |