annotate cli-chansession.c @ 45:9ee8996a375f

Pubkey auth is mostly there for the client. Something strange with remote hostkey verification though.
author Matt Johnston <matt@ucc.asn.au>
date Tue, 03 Aug 2004 17:26:56 +0000
parents 18eccbfb9641
children 3a4f0ef1e8c3
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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"
39
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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;
39
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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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diff changeset
154 value = tio.c_oflag & mapcode;
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parents: 39
diff changeset
155 break;
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diff changeset
156
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parents: 39
diff changeset
157 case TERMCODE_LOCAL:
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parents: 39
diff changeset
158 value = tio.c_lflag & mapcode;
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parents: 39
diff changeset
159 break;
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parents: 39
diff changeset
160
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parents: 39
diff changeset
161 case TERMCODE_CONTROL:
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parents: 39
diff changeset
162 value = tio.c_cflag & mapcode;
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Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
163 break;
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parents: 39
diff changeset
164
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parents: 39
diff changeset
165 default:
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parents: 39
diff changeset
166 continue;
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parents: 39
diff changeset
167
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
168 }
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parents: 39
diff changeset
169
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parents: 39
diff changeset
170 /* If we reach here, we have something to say */
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parents: 39
diff changeset
171 buf_putbyte(ses.writepayload, sshcode);
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diff changeset
172 buf_putint(ses.writepayload, value);
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parents: 39
diff changeset
173 }
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parents: 39
diff changeset
174
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parents: 39
diff changeset
175 buf_putbyte(ses.writepayload, 0); /* THE END, aka TTY_OP_END */
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parents: 39
diff changeset
176
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parents: 39
diff changeset
177 /* Put the string length at the start of the buffer */
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diff changeset
178 bufpos2 = ses.writepayload->pos;
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parents: 39
diff changeset
179
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parents: 39
diff changeset
180 buf_setpos(ses.writepayload, bufpos1); /* Jump back */
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parents: 39
diff changeset
181 buf_putint(ses.writepayload, bufpos2 - bufpos1); /* len(termcodes) */
b4874d772210 - Added terminal mode handling etc for the client, and window change
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parents: 39
diff changeset
182 buf_setpos(ses.writepayload, bufpos2); /* Back where we were */
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parents: 39
diff changeset
183
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parents: 39
diff changeset
184 TRACE(("leave put_termcodes"));
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parents: 39
diff changeset
185 }
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parents: 39
diff changeset
186
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diff changeset
187 static void put_winsize() {
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diff changeset
188
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diff changeset
189 struct winsize ws;
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diff changeset
190
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parents: 39
diff changeset
191 if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) < 0) {
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parents: 39
diff changeset
192 /* Some sane defaults */
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parents: 39
diff changeset
193 ws.ws_row = 25;
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parents: 39
diff changeset
194 ws.ws_col = 80;
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parents: 39
diff changeset
195 ws.ws_xpixel = 0;
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parents: 39
diff changeset
196 ws.ws_ypixel = 0;
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parents: 39
diff changeset
197 }
b4874d772210 - Added terminal mode handling etc for the client, and window change
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parents: 39
diff changeset
198
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parents: 39
diff changeset
199 buf_putint(ses.writepayload, ws.ws_col); /* Cols */
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parents: 39
diff changeset
200 buf_putint(ses.writepayload, ws.ws_row); /* Rows */
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Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
201 buf_putint(ses.writepayload, ws.ws_xpixel); /* Width */
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
202 buf_putint(ses.writepayload, ws.ws_ypixel); /* Height */
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
203
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
204 }
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
205
41
18eccbfb9641 added window-size change handling
Matt Johnston <matt@ucc.asn.au>
parents: 40
diff changeset
206 static void sigwinch_handler(int dummy) {
18eccbfb9641 added window-size change handling
Matt Johnston <matt@ucc.asn.au>
parents: 40
diff changeset
207
18eccbfb9641 added window-size change handling
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diff changeset
208 cli_ses.winchange = 1;
18eccbfb9641 added window-size change handling
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diff changeset
209
18eccbfb9641 added window-size change handling
Matt Johnston <matt@ucc.asn.au>
parents: 40
diff changeset
210 }
18eccbfb9641 added window-size change handling
Matt Johnston <matt@ucc.asn.au>
parents: 40
diff changeset
211
18eccbfb9641 added window-size change handling
Matt Johnston <matt@ucc.asn.au>
parents: 40
diff changeset
212 void cli_chansess_winchange() {
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diff changeset
213
18eccbfb9641 added window-size change handling
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parents: 40
diff changeset
214 unsigned int i;
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diff changeset
215 struct Channel *channel = NULL;
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Matt Johnston <matt@ucc.asn.au>
parents: 40
diff changeset
216
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Matt Johnston <matt@ucc.asn.au>
parents: 40
diff changeset
217 for (i = 0; i < ses.chansize; i++) {
18eccbfb9641 added window-size change handling
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parents: 40
diff changeset
218 channel = ses.channels[i];
18eccbfb9641 added window-size change handling
Matt Johnston <matt@ucc.asn.au>
parents: 40
diff changeset
219 if (channel != NULL && channel->type == &clichansess) {
18eccbfb9641 added window-size change handling
Matt Johnston <matt@ucc.asn.au>
parents: 40
diff changeset
220 CHECKCLEARTOWRITE();
18eccbfb9641 added window-size change handling
Matt Johnston <matt@ucc.asn.au>
parents: 40
diff changeset
221 buf_putbyte(ses.writepayload, SSH_MSG_CHANNEL_REQUEST);
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Matt Johnston <matt@ucc.asn.au>
parents: 40
diff changeset
222 buf_putint(ses.writepayload, channel->remotechan);
18eccbfb9641 added window-size change handling
Matt Johnston <matt@ucc.asn.au>
parents: 40
diff changeset
223 buf_putstring(ses.writepayload, "window-change", 13);
18eccbfb9641 added window-size change handling
Matt Johnston <matt@ucc.asn.au>
parents: 40
diff changeset
224 buf_putbyte(ses.writepayload, 0); /* FALSE says the spec */
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Matt Johnston <matt@ucc.asn.au>
parents: 40
diff changeset
225 put_winsize();
18eccbfb9641 added window-size change handling
Matt Johnston <matt@ucc.asn.au>
parents: 40
diff changeset
226 encrypt_packet();
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Matt Johnston <matt@ucc.asn.au>
parents: 40
diff changeset
227 }
18eccbfb9641 added window-size change handling
Matt Johnston <matt@ucc.asn.au>
parents: 40
diff changeset
228 }
18eccbfb9641 added window-size change handling
Matt Johnston <matt@ucc.asn.au>
parents: 40
diff changeset
229 cli_ses.winchange = 0;
18eccbfb9641 added window-size change handling
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parents: 40
diff changeset
230 }
18eccbfb9641 added window-size change handling
Matt Johnston <matt@ucc.asn.au>
parents: 40
diff changeset
231
39
0883c0906870 tty raw mode support works mostly
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parents:
diff changeset
232 static void send_chansess_pty_req(struct Channel *channel) {
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diff changeset
233
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diff changeset
234 unsigned char* term = NULL;
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parents:
diff changeset
235
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diff changeset
236 TRACE(("enter send_chansess_pty_req"));
40
b4874d772210 - Added terminal mode handling etc for the client, and window change
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diff changeset
237
39
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parents:
diff changeset
238 start_channel_request(channel, "pty-req");
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parents:
diff changeset
239
40
b4874d772210 - Added terminal mode handling etc for the client, and window change
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parents: 39
diff changeset
240 /* Don't want replies */
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
241 buf_putbyte(ses.writepayload, 0);
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Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
242
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
243 /* Get the terminal */
39
0883c0906870 tty raw mode support works mostly
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
244 term = getenv("TERM");
0883c0906870 tty raw mode support works mostly
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parents:
diff changeset
245 if (term == NULL) {
40
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
246 term = "vt100"; /* Seems a safe default */
39
0883c0906870 tty raw mode support works mostly
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
247 }
0883c0906870 tty raw mode support works mostly
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parents:
diff changeset
248 buf_putstring(ses.writepayload, term, strlen(term));
0883c0906870 tty raw mode support works mostly
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parents:
diff changeset
249
40
b4874d772210 - Added terminal mode handling etc for the client, and window change
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parents: 39
diff changeset
250 /* Window size */
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
251 put_winsize();
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Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
252
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
253 /* Terminal mode encoding */
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
254 put_termcodes();
39
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parents:
diff changeset
255
0883c0906870 tty raw mode support works mostly
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
256 encrypt_packet();
41
18eccbfb9641 added window-size change handling
Matt Johnston <matt@ucc.asn.au>
parents: 40
diff changeset
257
18eccbfb9641 added window-size change handling
Matt Johnston <matt@ucc.asn.au>
parents: 40
diff changeset
258 /* Set up a window-change handler */
18eccbfb9641 added window-size change handling
Matt Johnston <matt@ucc.asn.au>
parents: 40
diff changeset
259 if (signal(SIGWINCH, sigwinch_handler) == SIG_ERR) {
18eccbfb9641 added window-size change handling
Matt Johnston <matt@ucc.asn.au>
parents: 40
diff changeset
260 dropbear_exit("signal error");
18eccbfb9641 added window-size change handling
Matt Johnston <matt@ucc.asn.au>
parents: 40
diff changeset
261 }
39
0883c0906870 tty raw mode support works mostly
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parents:
diff changeset
262 TRACE(("leave send_chansess_pty_req"));
0883c0906870 tty raw mode support works mostly
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
263 }
0883c0906870 tty raw mode support works mostly
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parents:
diff changeset
264
0883c0906870 tty raw mode support works mostly
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parents:
diff changeset
265 static void send_chansess_shell_req(struct Channel *channel) {
0883c0906870 tty raw mode support works mostly
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parents:
diff changeset
266
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parents:
diff changeset
267 unsigned char* reqtype = NULL;
0883c0906870 tty raw mode support works mostly
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parents:
diff changeset
268
0883c0906870 tty raw mode support works mostly
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parents:
diff changeset
269 TRACE(("enter send_chansess_shell_req"));
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parents:
diff changeset
270
0883c0906870 tty raw mode support works mostly
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
271 if (cli_opts.cmd) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
272 reqtype = "exec";
0883c0906870 tty raw mode support works mostly
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parents:
diff changeset
273 } else {
0883c0906870 tty raw mode support works mostly
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parents:
diff changeset
274 reqtype = "shell";
0883c0906870 tty raw mode support works mostly
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parents:
diff changeset
275 }
0883c0906870 tty raw mode support works mostly
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parents:
diff changeset
276
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parents:
diff changeset
277 start_channel_request(channel, reqtype);
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parents:
diff changeset
278
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parents:
diff changeset
279 /* XXX TODO */
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parents:
diff changeset
280 buf_putbyte(ses.writepayload, 0); /* Don't want replies */
0883c0906870 tty raw mode support works mostly
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
281 if (cli_opts.cmd) {
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parents:
diff changeset
282 buf_putstring(ses.writepayload, cli_opts.cmd, strlen(cli_opts.cmd));
0883c0906870 tty raw mode support works mostly
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parents:
diff changeset
283 }
0883c0906870 tty raw mode support works mostly
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parents:
diff changeset
284
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parents:
diff changeset
285 encrypt_packet();
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parents:
diff changeset
286 TRACE(("leave send_chansess_shell_req"));
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
287 }
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parents:
diff changeset
288
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parents:
diff changeset
289 static int cli_initchansess(struct Channel *channel) {
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parents:
diff changeset
290
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parents:
diff changeset
291 channel->infd = STDOUT_FILENO;
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parents:
diff changeset
292 //channel->outfd = STDIN_FILENO;
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parents:
diff changeset
293 //channel->errfd = STDERR_FILENO;
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parents:
diff changeset
294
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parents:
diff changeset
295 if (cli_opts.wantpty) {
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parents:
diff changeset
296 send_chansess_pty_req(channel);
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parents:
diff changeset
297 }
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parents:
diff changeset
298
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parents:
diff changeset
299 send_chansess_shell_req(channel);
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parents:
diff changeset
300
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parents:
diff changeset
301 if (cli_opts.wantpty) {
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parents:
diff changeset
302 cli_tty_setup();
0883c0906870 tty raw mode support works mostly
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parents:
diff changeset
303 }
0883c0906870 tty raw mode support works mostly
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parents:
diff changeset
304
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parents:
diff changeset
305 return 0; /* Success */
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parents:
diff changeset
306
0883c0906870 tty raw mode support works mostly
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parents:
diff changeset
307 }
0883c0906870 tty raw mode support works mostly
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parents:
diff changeset
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 }