annotate cli-session.c @ 172:3e49d8d18005

* respect DO_HOST_LOOKUP config option
author Matt Johnston <matt@ucc.asn.au>
date Mon, 28 Feb 2005 10:15:16 +0000
parents 0cfba3034be5
children 2c5741e4b855
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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
26
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26 #include "includes.h"
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27 #include "session.h"
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28 #include "dbutil.h"
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29 #include "kex.h"
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30 #include "ssh.h"
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31 #include "packet.h"
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32 #include "tcpfwd.h"
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33 #include "channel.h"
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34 #include "random.h"
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35 #include "service.h"
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36 #include "runopts.h"
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37 #include "chansession.h"
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38
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39 static void cli_remoteclosed();
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40 static void cli_sessionloop();
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41 static void cli_session_init();
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42 static void cli_finished();
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43
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44 struct clientsession cli_ses; /* GLOBAL */
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45
45
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46 /* Sorted in decreasing frequency will be more efficient - data and window
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47 * should be first */
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48 static const packettype cli_packettypes[] = {
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49 /* TYPE, FUNCTION */
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50 {SSH_MSG_CHANNEL_DATA, recv_msg_channel_data},
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51 {SSH_MSG_CHANNEL_EXTENDED_DATA, recv_msg_channel_extended_data},
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52 {SSH_MSG_CHANNEL_WINDOW_ADJUST, recv_msg_channel_window_adjust},
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53 {SSH_MSG_USERAUTH_FAILURE, recv_msg_userauth_failure}, /* client */
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54 {SSH_MSG_USERAUTH_SUCCESS, recv_msg_userauth_success}, /* client */
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55 {SSH_MSG_KEXINIT, recv_msg_kexinit},
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56 {SSH_MSG_KEXDH_REPLY, recv_msg_kexdh_reply}, /* client */
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57 {SSH_MSG_NEWKEYS, recv_msg_newkeys},
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58 {SSH_MSG_SERVICE_ACCEPT, recv_msg_service_accept}, /* client */
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59 {SSH_MSG_CHANNEL_REQUEST, recv_msg_channel_request},
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60 {SSH_MSG_CHANNEL_OPEN, recv_msg_channel_open},
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61 {SSH_MSG_CHANNEL_EOF, recv_msg_channel_eof},
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62 {SSH_MSG_CHANNEL_CLOSE, recv_msg_channel_close},
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63 {SSH_MSG_CHANNEL_OPEN_CONFIRMATION, recv_msg_channel_open_confirmation},
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64 {SSH_MSG_CHANNEL_OPEN_FAILURE, recv_msg_channel_open_failure},
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65 {SSH_MSG_USERAUTH_BANNER, recv_msg_userauth_banner}, /* client */
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66 #ifdef ENABLE_CLI_PUBKEY_AUTH
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67 {SSH_MSG_USERAUTH_PK_OK, recv_msg_userauth_pk_ok}, /* client */
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68 #endif
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69 {0, 0} /* End */
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70 };
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71
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72 static const struct ChanType *cli_chantypes[] = {
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73 #ifdef ENABLE_CLI_REMOTETCPFWD
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74 &cli_chan_tcpremote,
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75 #endif
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76 NULL /* Null termination */
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77 };
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78
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79 void cli_session(int sock, char* remotehost) {
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80
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81 crypto_init();
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82 common_session_init(sock, remotehost);
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83
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84 chaninitialise(cli_chantypes);
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85
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86
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87 /* Set up cli_ses vars */
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88 cli_session_init();
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89
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90 /* Ready to go */
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91 sessinitdone = 1;
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92
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93 /* Exchange identification */
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94 session_identification();
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95
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96 seedrandom();
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97
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98 send_msg_kexinit();
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99
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100 /* XXX here we do stuff differently */
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101
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102 session_loop(cli_sessionloop);
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103
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104 /* Not reached */
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105
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106 }
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107
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108 static void cli_session_init() {
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109
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110 cli_ses.state = STATE_NOTHING;
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111 cli_ses.kex_state = KEX_NOTHING;
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112
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113 cli_ses.tty_raw_mode = 0;
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114 cli_ses.winchange = 0;
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115
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116 /* We store stdin's flags, so we can set them back on exit (otherwise
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117 * busybox's ash isn't happy */
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118 cli_ses.stdincopy = dup(STDIN_FILENO);
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119 cli_ses.stdinflags = fcntl(STDIN_FILENO, F_GETFL, 0);
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120
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121 cli_ses.retval = EXIT_SUCCESS; /* Assume it's clean if we don't get a
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122 specific exit status */
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123
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124 /* Auth */
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125 cli_ses.lastpubkey = NULL;
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126 cli_ses.lastauthtype = 0;
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127
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128 /* For printing "remote host closed" for the user */
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129 ses.remoteclosed = cli_remoteclosed;
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130 ses.buf_match_algo = cli_buf_match_algo;
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131
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132 /* packet handlers */
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133 ses.packettypes = cli_packettypes;
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134
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135 ses.isserver = 0;
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136 }
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137
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138 /* This function drives the progress of the session - it initiates KEX,
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139 * service, userauth and channel requests */
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140 static void cli_sessionloop() {
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141
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142 TRACE(("enter cli_sessionloop"))
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143
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144 if (ses.lastpacket == SSH_MSG_KEXINIT && cli_ses.kex_state == KEX_NOTHING) {
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145 cli_ses.kex_state = KEXINIT_RCVD;
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146 }
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147
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parents: 33
diff changeset
148 if (cli_ses.kex_state == KEXINIT_RCVD) {
33
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parents: 26
diff changeset
149
f789045062e6 Progressing client support
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parents: 26
diff changeset
150 /* We initiate the KEXDH. If DH wasn't the correct type, the KEXINIT
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
151 * negotiation would have failed. */
f789045062e6 Progressing client support
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parents: 26
diff changeset
152 send_msg_kexdh_init();
f789045062e6 Progressing client support
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parents: 26
diff changeset
153 cli_ses.kex_state = KEXDH_INIT_SENT;
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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parents: 136
diff changeset
154 TRACE(("leave cli_sessionloop: done with KEXINIT_RCVD"))
33
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parents: 26
diff changeset
155 return;
f789045062e6 Progressing client support
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parents: 26
diff changeset
156 }
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
157
f789045062e6 Progressing client support
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parents: 26
diff changeset
158 /* A KEX has finished, so we should go back to our KEX_NOTHING state */
f789045062e6 Progressing client support
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parents: 26
diff changeset
159 if (cli_ses.kex_state != KEX_NOTHING && ses.kexstate.recvkexinit == 0
f789045062e6 Progressing client support
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parents: 26
diff changeset
160 && ses.kexstate.sentkexinit == 0) {
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parents: 26
diff changeset
161 cli_ses.kex_state = KEX_NOTHING;
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
162 }
f789045062e6 Progressing client support
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parents: 26
diff changeset
163
f789045062e6 Progressing client support
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parents: 26
diff changeset
164 /* We shouldn't do anything else if a KEX is in progress */
f789045062e6 Progressing client support
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parents: 26
diff changeset
165 if (cli_ses.kex_state != KEX_NOTHING) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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parents: 136
diff changeset
166 TRACE(("leave cli_sessionloop: kex_state != KEX_NOTHING"))
33
f789045062e6 Progressing client support
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parents: 26
diff changeset
167 return;
f789045062e6 Progressing client support
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parents: 26
diff changeset
168 }
f789045062e6 Progressing client support
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parents: 26
diff changeset
169
f789045062e6 Progressing client support
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parents: 26
diff changeset
170 /* We should exit if we haven't donefirstkex: we shouldn't reach here
f789045062e6 Progressing client support
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parents: 26
diff changeset
171 * in normal operation */
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parents: 26
diff changeset
172 if (ses.kexstate.donefirstkex == 0) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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parents: 136
diff changeset
173 TRACE(("XXX XXX might be bad! leave cli_sessionloop: haven't donefirstkex"))
34
e2a1eaa19f22 Client mostly works up to password auth
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parents: 33
diff changeset
174 return;
33
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parents: 26
diff changeset
175 }
f789045062e6 Progressing client support
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parents: 26
diff changeset
176
26
0969767bca0d snapshot of stuff
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parents:
diff changeset
177 switch (cli_ses.state) {
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parents:
diff changeset
178
33
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parents: 26
diff changeset
179 case STATE_NOTHING:
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parents: 26
diff changeset
180 /* We've got the transport layer sorted, we now need to request
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parents: 26
diff changeset
181 * userauth */
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parents: 26
diff changeset
182 send_msg_service_request(SSH_SERVICE_USERAUTH);
f789045062e6 Progressing client support
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diff changeset
183 cli_ses.state = SERVICE_AUTH_REQ_SENT;
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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diff changeset
184 TRACE(("leave cli_sessionloop: sent userauth service req"))
33
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parents: 26
diff changeset
185 return;
26
0969767bca0d snapshot of stuff
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parents:
diff changeset
186
33
f789045062e6 Progressing client support
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parents: 26
diff changeset
187 /* userauth code */
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parents: 26
diff changeset
188 case SERVICE_AUTH_ACCEPT_RCVD:
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parents: 26
diff changeset
189 cli_auth_getmethods();
45
9ee8996a375f Pubkey auth is mostly there for the client. Something strange with
Matt Johnston <matt@ucc.asn.au>
parents: 43
diff changeset
190 cli_ses.state = USERAUTH_REQ_SENT;
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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parents: 136
diff changeset
191 TRACE(("leave cli_sessionloop: sent userauth methods req"))
33
f789045062e6 Progressing client support
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parents: 26
diff changeset
192 return;
f789045062e6 Progressing client support
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parents: 26
diff changeset
193
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parents: 26
diff changeset
194 case USERAUTH_FAIL_RCVD:
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parents: 26
diff changeset
195 cli_auth_try();
45
9ee8996a375f Pubkey auth is mostly there for the client. Something strange with
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parents: 43
diff changeset
196 cli_ses.state = USERAUTH_REQ_SENT;
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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parents: 136
diff changeset
197 TRACE(("leave cli_sessionloop: cli_auth_try"))
33
f789045062e6 Progressing client support
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parents: 26
diff changeset
198 return;
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parents: 26
diff changeset
199
47
4b53a43f0082 - client pubkey auth works
Matt Johnston <matt@ucc.asn.au>
parents: 45
diff changeset
200 /*
37
0913e2ee3545 we're nearly there yet
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parents: 35
diff changeset
201 case USERAUTH_SUCCESS_RCVD:
0913e2ee3545 we're nearly there yet
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parents: 35
diff changeset
202 send_msg_service_request(SSH_SERVICE_CONNECTION);
0913e2ee3545 we're nearly there yet
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parents: 35
diff changeset
203 cli_ses.state = SERVICE_CONN_REQ_SENT;
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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parents: 136
diff changeset
204 TRACE(("leave cli_sessionloop: sent ssh-connection service req"))
37
0913e2ee3545 we're nearly there yet
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parents: 35
diff changeset
205 return;
0913e2ee3545 we're nearly there yet
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parents: 35
diff changeset
206
45
9ee8996a375f Pubkey auth is mostly there for the client. Something strange with
Matt Johnston <matt@ucc.asn.au>
parents: 43
diff changeset
207 case SERVICE_CONN_ACCEPT_RCVD:
9ee8996a375f Pubkey auth is mostly there for the client. Something strange with
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parents: 43
diff changeset
208 cli_send_chansess_request();
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 136
diff changeset
209 TRACE(("leave cli_sessionloop: cli_send_chansess_request"))
45
9ee8996a375f Pubkey auth is mostly there for the client. Something strange with
Matt Johnston <matt@ucc.asn.au>
parents: 43
diff changeset
210 cli_ses.state = SESSION_RUNNING;
9ee8996a375f Pubkey auth is mostly there for the client. Something strange with
Matt Johnston <matt@ucc.asn.au>
parents: 43
diff changeset
211 return;
47
4b53a43f0082 - client pubkey auth works
Matt Johnston <matt@ucc.asn.au>
parents: 45
diff changeset
212 */
45
9ee8996a375f Pubkey auth is mostly there for the client. Something strange with
Matt Johnston <matt@ucc.asn.au>
parents: 43
diff changeset
213
37
0913e2ee3545 we're nearly there yet
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
214 case USERAUTH_SUCCESS_RCVD:
64
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents: 62
diff changeset
215 #ifdef ENABLE_CLI_LOCALTCPFWD
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents: 62
diff changeset
216 setup_localtcp();
efb5e0b335cf TCP forwarding works.
Matt Johnston <matt@ucc.asn.au>
parents: 62
diff changeset
217 #endif
65
02e4a7f614f8 Oops, forgot to call the actual code.
Matt Johnston <matt@ucc.asn.au>
parents: 64
diff changeset
218 #ifdef ENABLE_CLI_REMOTETCPFWD
02e4a7f614f8 Oops, forgot to call the actual code.
Matt Johnston <matt@ucc.asn.au>
parents: 64
diff changeset
219 setup_remotetcp();
02e4a7f614f8 Oops, forgot to call the actual code.
Matt Johnston <matt@ucc.asn.au>
parents: 64
diff changeset
220 #endif
37
0913e2ee3545 we're nearly there yet
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
221 cli_send_chansess_request();
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 136
diff changeset
222 TRACE(("leave cli_sessionloop: cli_send_chansess_request"))
37
0913e2ee3545 we're nearly there yet
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
223 cli_ses.state = SESSION_RUNNING;
0913e2ee3545 we're nearly there yet
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
224 return;
0913e2ee3545 we're nearly there yet
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
225
40
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
226 case SESSION_RUNNING:
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
227 if (ses.chancount < 1) {
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
228 cli_finished();
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
229 }
41
18eccbfb9641 added window-size change handling
Matt Johnston <matt@ucc.asn.au>
parents: 40
diff changeset
230
18eccbfb9641 added window-size change handling
Matt Johnston <matt@ucc.asn.au>
parents: 40
diff changeset
231 if (cli_ses.winchange) {
18eccbfb9641 added window-size change handling
Matt Johnston <matt@ucc.asn.au>
parents: 40
diff changeset
232 cli_chansess_winchange();
18eccbfb9641 added window-size change handling
Matt Johnston <matt@ucc.asn.au>
parents: 40
diff changeset
233 }
40
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
234 return;
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
235
33
f789045062e6 Progressing client support
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parents: 26
diff changeset
236 /* XXX more here needed */
f789045062e6 Progressing client support
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parents: 26
diff changeset
237
f789045062e6 Progressing client support
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parents: 26
diff changeset
238
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
239 default:
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
240 break;
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
241 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
242
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 136
diff changeset
243 TRACE(("leave cli_sessionloop: fell out"))
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
244
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
245 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
246
40
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
247 void cli_session_cleanup() {
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
248
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
249 if (!sessinitdone) {
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
250 return;
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
251 }
99
0247fbd9379d Move the revert-to-non-blocking-stdin code to cli-session so it
Matt Johnston <matt@ucc.asn.au>
parents: 74
diff changeset
252
0247fbd9379d Move the revert-to-non-blocking-stdin code to cli-session so it
Matt Johnston <matt@ucc.asn.au>
parents: 74
diff changeset
253 /* Set stdin back to non-blocking - busybox ash dies nastily
0247fbd9379d Move the revert-to-non-blocking-stdin code to cli-session so it
Matt Johnston <matt@ucc.asn.au>
parents: 74
diff changeset
254 * if we don't revert the flags */
100
c72f5c10125d oops, the fcntl() was commented out
Matt Johnston <matt@ucc.asn.au>
parents: 99
diff changeset
255 fcntl(cli_ses.stdincopy, F_SETFL, cli_ses.stdinflags);
99
0247fbd9379d Move the revert-to-non-blocking-stdin code to cli-session so it
Matt Johnston <matt@ucc.asn.au>
parents: 74
diff changeset
256
40
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
257 cli_tty_cleanup();
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
258
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
259 }
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
260
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
261 static void cli_finished() {
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
262
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
263 cli_session_cleanup();
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
264 common_session_cleanup();
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
265 fprintf(stderr, "Connection to %s@%s:%s closed.\n", cli_opts.username,
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
266 cli_opts.remotehost, cli_opts.remoteport);
108
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents: 107
diff changeset
267 exit(cli_ses.retval);
40
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
268 }
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
269
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
270
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
271 /* called when the remote side closes the connection */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
272 static void cli_remoteclosed() {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
273
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
274 /* XXX TODO perhaps print a friendlier message if we get this but have
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
275 * already sent/received disconnect message(s) ??? */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
276 close(ses.sock);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
277 ses.sock = -1;
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
278 dropbear_exit("remote closed the connection");
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
279 }
43
942b22d7dd1c Banner printing
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
280
942b22d7dd1c Banner printing
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
281 /* Operates in-place turning dirty (untrusted potentially containing control
942b22d7dd1c Banner printing
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
282 * characters) text into clean text. */
942b22d7dd1c Banner printing
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
283 void cleantext(unsigned char* dirtytext) {
942b22d7dd1c Banner printing
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
284
942b22d7dd1c Banner printing
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
285 unsigned int i, j;
47
4b53a43f0082 - client pubkey auth works
Matt Johnston <matt@ucc.asn.au>
parents: 45
diff changeset
286 unsigned char c;
43
942b22d7dd1c Banner printing
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
287
942b22d7dd1c Banner printing
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
288 j = 0;
942b22d7dd1c Banner printing
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
289 for (i = 0; dirtytext[i] != '\0'; i++) {
942b22d7dd1c Banner printing
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
290
942b22d7dd1c Banner printing
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
291 c = dirtytext[i];
942b22d7dd1c Banner printing
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
292 /* We can ignore '\r's */
942b22d7dd1c Banner printing
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
293 if ( (c >= ' ' && c <= '~') || c == '\n' || c == '\t') {
942b22d7dd1c Banner printing
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
294 dirtytext[j] = c;
942b22d7dd1c Banner printing
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
295 j++;
942b22d7dd1c Banner printing
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
296 }
942b22d7dd1c Banner printing
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
297 }
942b22d7dd1c Banner printing
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
298 /* Null terminate */
942b22d7dd1c Banner printing
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
299 dirtytext[j] = '\0';
942b22d7dd1c Banner printing
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
300 }