1 | /* SPDX-License-Identifier: BSD-2-Clause */ |
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2 | |
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3 | /** |
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4 | * @file |
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5 | * |
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6 | * @brief |
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7 | */ |
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8 | |
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9 | /* FIXME: 1. Parse command is a hack. We can do better. |
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10 | * 2. OSV: hooks support seems to be bad, as it requires storing of |
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11 | * entire input file in memory. Seems to be better to change it to |
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12 | * something more reasonable, like having |
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13 | * 'hook_write(void const *buf, int count)' routine that will be |
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14 | * called multiple times while file is being received. |
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15 | * 3. OSV: Remove hack with "/dev/null"? |
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16 | * |
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17 | * FTP Server Daemon |
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18 | * |
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19 | * Submitted by: Jake Janovetz <janovetz@tempest.ece.uiuc.edu> |
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20 | * |
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21 | * Changed by: Sergei Organov <osv@javad.ru> (OSV) |
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22 | * Arnout Vandecappelle <arnout@mind.be> (AV) |
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23 | * Sebastien Bourdeauducq <sebastien@milkymist.org> (MM) |
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24 | * |
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25 | * |
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26 | * Changes: |
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27 | * |
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28 | * 2010-12-02 Sebastien Bourdeauducq <sebastien@milkymist.org> |
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29 | * |
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30 | * * Support spaces in filenames |
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31 | * |
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32 | * 2010-04-29 Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be> |
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33 | * |
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34 | * * Added USER/PASS authentication. |
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35 | * |
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36 | * 2001-01-31 Sergei Organov <osv@javad.ru> |
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37 | * |
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38 | * * Hacks with current dir and root dir removed in favor of new libio |
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39 | * support for task-local current and root directories. |
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40 | * |
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41 | * 2001-01-30 Sergei Organov <osv@javad.ru> |
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42 | * |
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43 | * * Bug in `close_data_socket()' introduced by previous change fixed. |
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44 | * * `command_pasv()' changed to set timeout on socket we are listening on |
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45 | * and code fixed to not close socket twice on error. |
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46 | * * `serr()' changed to clear `errno'. |
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47 | * * `data_socket()' changed to clear `errno' before `bind()'. |
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48 | * * `session()' changed to clear `errno' before processing session. |
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49 | * |
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50 | * 2001-01-29 Sergei Organov <osv@javad.ru> |
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51 | * |
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52 | * * `close_data_socket()' fixed to close both active and passive sockets |
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53 | * * Initialize info->data_socket to -1 in `daemon()' |
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54 | * * Initialize `fname' to empty string in `exec_command()' |
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55 | * |
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56 | * 2001-01-22 Sergei Organov <osv@javad.ru> |
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57 | * |
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58 | * * Timeouts on sockets implemented. 'idle' field added to |
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59 | * configuration. No timeout by default to keep backward compatibility. |
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60 | * Note: SITE IDLE command not implemented yet. |
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61 | * * Basic global access control implemented. 'access' field added to |
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62 | * configuration. No access limitations by default to keep backward |
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63 | * compatibility. |
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64 | * |
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65 | * 2001-01-17 Sergei Organov <osv@javad.ru> |
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66 | * |
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67 | * * Anchor data socket for active mode (using self IP and port 20.) |
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68 | * * Fixed default data port support (still not tested). |
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69 | * * Don't allow IP address different from originating host in |
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70 | * PORT command to improve security. |
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71 | * * Fixed bug in MDTM command. |
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72 | * * Check for correctness of parsing of argument in command_port(). |
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73 | * * Fixed squeeze_path() to don't allow names like 'NAME/smth' where |
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74 | * 'NAME' is not a directory. |
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75 | * * Command parsing a little bit improved: command names are now |
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76 | * converted to upper-case to be more compatible with RFC (command |
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77 | * names are not case-sensitive.) |
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78 | * * Reformat comments so that they have RTEMS look and feel. |
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79 | * |
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80 | * 2001-01-16 Sergei Organov <osv@javad.ru> |
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81 | * |
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82 | * * Fixed DELE, SITE CHMOD, RMD, MKD broken by previous changes |
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83 | * * True ASCII mode implemented (doesn't work for hooks and /dev/null) |
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84 | * * Passive mode implemented, PASV command added. |
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85 | * * Default port for data connection could be used (untested, can't find |
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86 | * ftp client that doesn't send PORT command) |
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87 | * * SYST reply changed to UNIX, as former RTEMS isn't registered name. |
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88 | * * Reply codes reviewed and fixed. |
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89 | * |
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90 | * 2001-01-08 Sergei Organov <osv@javad.ru> |
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91 | * |
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92 | * * use pool of pre-created threads to handle sessions |
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93 | * * LIST output now similar to what "/bin/ls -al" would output, thus |
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94 | * FTP clients could parse it. |
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95 | * * LIST NAME now works (both for files and directories) |
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96 | * * keep track of CWD for every session separately |
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97 | * * ability to specify root directory name in configuration table |
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98 | * * options sent in commands are ignored, thus LIST -al FILE works |
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99 | * * added support for NLST, CDUP and MDTM commands |
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100 | * * buffers are allocated on stack instead of heap where possible |
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101 | * * drop using of task notepad to pass parameters - use function |
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102 | * arguments instead |
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103 | * * various bug-fixes, e.g., use of PF_INET in socket() instead of |
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104 | * AF_INET, use snprintf() instead of sprintf() everywhere for safety, |
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105 | * etc. |
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106 | */ |
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107 | |
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108 | /************************************************************************* |
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109 | * ftpd.c |
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110 | ************************************************************************* |
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111 | * Description: |
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112 | * |
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113 | * This file contains the daemon which services requests that appear |
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114 | * on the FTP port. This server is compatible with FTP, but it |
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115 | * also provides 'hooks' to make it usable in situations where files |
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116 | * are not used/necessary. Once the server is started, it runs |
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117 | * forever. |
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118 | * |
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119 | * |
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120 | * Organization: |
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121 | * |
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122 | * The FTP daemon is started upon boot along with a (configurable) |
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123 | * number of tasks to handle sessions. It runs all the time and |
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124 | * waits for connections on the known FTP port (21). When |
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125 | * a connection is made, it wakes-up a 'session' task. That |
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126 | * session then interacts with the remote host. When the session |
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127 | * is complete, the session task goes to sleep. The daemon still |
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128 | * runs, however. |
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129 | * |
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130 | * |
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131 | * Supported commands are: |
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132 | * |
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133 | * RETR xxx - Sends a file from the client. |
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134 | * STOR xxx - Receives a file from the client. xxx = filename. |
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135 | * LIST xxx - Sends a file list to the client. |
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136 | * NLST xxx - Sends a file list to the client. |
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137 | * USER - Does nothing. |
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138 | * PASS - Does nothing. |
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139 | * SYST - Replies with the system type (`RTEMS'). |
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140 | * DELE xxx - Delete file xxx. |
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141 | * MKD xxx - Create directory xxx. |
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142 | * RMD xxx - Remove directory xxx. |
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143 | * PWD - Print working directory. |
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144 | * CWD xxx - Change working directory. |
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145 | * CDUP - Change to upper directory. |
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146 | * SITE CHMOD xxx yyy - Change permissions on file yyy to xxx. |
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147 | * PORT a,b,c,d,x,y - Setup for a data port to IP address a.b.c.d |
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148 | * and port (x*256 + y). |
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149 | * MDTM xxx - Send file modification date/time to the client. |
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150 | * xxx = filename. |
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151 | * PASV - Use passive mode data connection. |
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152 | * |
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153 | * |
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154 | * The public routines contained in this file are: |
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155 | * |
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156 | * rtems_initialize_ftpd - Initializes and starts the server daemon, |
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157 | * then returns to its caller. |
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158 | * |
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159 | *------------------------------------------------------------------------ |
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160 | * Jake Janovetz |
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161 | * University of Illinois |
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162 | * 1406 West Green Street |
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163 | * Urbana IL 61801 |
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164 | ************************************************************************* |
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165 | * Change History: |
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166 | * 12/01/97 - Creation (JWJ) |
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167 | * 2001-01-08 - Changes by OSV |
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168 | * 2010-04-29 - Authentication added by AV |
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169 | *************************************************************************/ |
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170 | |
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171 | /************************************************************************* |
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172 | * Meanings of first and second digits of reply codes: |
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173 | * |
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174 | * Reply: Description: |
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175 | *-------- -------------- |
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176 | * 1yz Positive preliminary reply. The action is being started but |
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177 | * expect another reply before sending another command. |
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178 | * 2yz Positive completion reply. A new command can be sent. |
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179 | * 3yz Positive intermediate reply. The command has been accepted |
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180 | * but another command must be sent. |
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181 | * 4yz Transient negative completion reply. The requested action did |
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182 | * not take place, but the error condition is temporary so the |
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183 | * command can be reissued later. |
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184 | * 5yz Permanent negative completion reply. The command was not |
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185 | * accepted and should not be retried. |
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186 | *------------------------------------------------------------------------- |
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187 | * x0z Syntax errors. |
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188 | * x1z Information. |
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189 | * x2z Connections. Replies referring to the control or data |
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190 | * connections. |
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191 | * x3z Authentication and accounting. Replies for the login or |
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192 | * accounting commands. |
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193 | * x4z Unspecified. |
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194 | * x5z Filesystem status. |
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195 | *************************************************************************/ |
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196 | |
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197 | /* |
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198 | * Copyright (C) 1999 Jake Janovetz <janovetz@tempest.ece.uiuc.edu> |
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199 | * |
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200 | * Redistribution and use in source and binary forms, with or without |
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201 | * modification, are permitted provided that the following conditions |
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202 | * are met: |
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203 | * 1. Redistributions of source code must retain the above copyright |
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204 | * notice, this list of conditions and the following disclaimer. |
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205 | * 2. Redistributions in binary form must reproduce the above copyright |
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206 | * notice, this list of conditions and the following disclaimer in the |
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207 | * documentation and/or other materials provided with the distribution. |
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208 | * |
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209 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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210 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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211 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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212 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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213 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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214 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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215 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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216 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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217 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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218 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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219 | * POSSIBILITY OF SUCH DAMAGE. |
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220 | */ |
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221 | |
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222 | #ifdef HAVE_CONFIG_H |
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223 | #include "config.h" |
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224 | #endif |
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225 | |
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226 | #include <stdio.h> |
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227 | #include <stdlib.h> |
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228 | #include <string.h> |
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229 | #include <unistd.h> |
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230 | #include <fcntl.h> |
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231 | #include <dirent.h> |
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232 | #include <errno.h> |
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233 | #include <ctype.h> |
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234 | #include <inttypes.h> |
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235 | #include <sched.h> |
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236 | |
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237 | #include <rtems.h> |
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238 | #include <rtems/error.h> |
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239 | #include <rtems/ftpd.h> |
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240 | #include <rtems/libio.h> |
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241 | #include <rtems/thread.h> |
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242 | #include <rtems/userenv.h> |
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243 | #include <syslog.h> |
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244 | |
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245 | #include <sys/types.h> |
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246 | #include <sys/socket.h> |
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247 | #include <arpa/ftp.h> |
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248 | #include <netinet/in.h> |
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249 | |
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250 | |
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251 | #ifdef __GNUC__ |
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252 | /* change to #if 1 to disable syslog entirely */ |
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253 | #if 0 |
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254 | #undef syslog |
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255 | #define syslog(a, b, ...) while(0){} |
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256 | #endif |
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257 | #endif |
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258 | |
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259 | #define FTPD_SERVER_MESSAGE "RTEMS FTP server (Version 1.1-JWJ) ready." |
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260 | |
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261 | #define FTPD_SYSTYPE "UNIX Type: L8" |
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262 | |
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263 | /* Seems to be unused */ |
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264 | #if 0 |
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265 | #define FTPD_WELCOME_MESSAGE \ |
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266 | "Welcome to the RTEMS FTP server.\n" \ |
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267 | "\n" \ |
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268 | "Login accepted.\n" |
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269 | #endif |
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270 | |
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271 | /* Event to be used by session tasks for waiting */ |
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272 | enum |
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273 | { |
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274 | FTPD_RTEMS_EVENT = RTEMS_EVENT_1 |
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275 | }; |
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276 | |
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277 | /* Configuration table */ |
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278 | static struct rtems_ftpd_configuration *ftpd_config; |
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279 | |
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280 | /* this is not prototyped in strict ansi mode */ |
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281 | FILE *fdopen (int fildes, const char *mode); |
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282 | |
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283 | /*SessionInfo structure. |
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284 | * |
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285 | * The following structure is allocated for each session. |
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286 | */ |
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287 | typedef struct |
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288 | { |
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289 | struct sockaddr_in ctrl_addr; /* Control connection self address */ |
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290 | struct sockaddr_in data_addr; /* Data address set by PORT command */ |
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291 | struct sockaddr_in def_addr; /* Default address for data */ |
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292 | int use_default; /* 1 - use default address for data */ |
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293 | FILE *ctrl_fp; /* File pointer for control connection */ |
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294 | int ctrl_socket; /* Socket for ctrl connection */ |
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295 | int pasv_socket; /* Socket for PASV connection */ |
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296 | int data_socket; /* Socket for data connection */ |
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297 | int idle; /* Timeout in seconds */ |
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298 | int xfer_mode; /* Transfer mode (ASCII/binary) */ |
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299 | rtems_id tid; /* Task id */ |
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300 | char *user; /* user name (0 if not supplied) */ |
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301 | char user_buf[256]; /* user name buffer */ |
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302 | bool auth; /* true if user/pass was valid, false if not or not supplied */ |
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303 | } FTPD_SessionInfo_t; |
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304 | |
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305 | |
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306 | /* |
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307 | * TaskPool structure. |
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308 | */ |
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309 | typedef struct |
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310 | { |
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311 | FTPD_SessionInfo_t *info; |
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312 | FTPD_SessionInfo_t **queue; |
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313 | int count; |
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314 | int head; |
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315 | int tail; |
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316 | rtems_mutex mutex; |
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317 | rtems_counting_semaphore sem; |
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318 | } FTPD_TaskPool_t; |
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319 | |
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320 | /* |
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321 | * Task pool instance. |
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322 | */ |
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323 | static FTPD_TaskPool_t task_pool; |
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324 | |
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325 | /* |
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326 | * Root directory |
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327 | */ |
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328 | |
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329 | static char const* ftpd_root = "/"; |
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330 | |
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331 | /* |
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332 | * Default idle timeout for sockets in seconds. |
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333 | */ |
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334 | static int ftpd_timeout = 0; |
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335 | |
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336 | /* |
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337 | * Global access flags. |
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338 | */ |
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339 | static int ftpd_access = 0; |
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340 | |
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341 | static void |
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342 | yield(void) |
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343 | { |
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344 | /* |
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345 | * If we do not build for the legacy network stack, then we use the libbsd. In |
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346 | * the libbsd there is no global network stack semaphore which provides round |
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347 | * robin fairness for threads of equal priority. |
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348 | */ |
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349 | #ifndef RTEMS_NETWORKING |
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350 | sched_yield(); |
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351 | #endif |
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352 | } |
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353 | |
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354 | /* |
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355 | * serr |
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356 | * |
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357 | * Return error string corresponding to current 'errno'. |
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358 | * |
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359 | */ |
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360 | static char const* |
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361 | serr(void) |
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362 | { |
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363 | int err = errno; |
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364 | errno = 0; |
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365 | return strerror(err); |
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366 | } |
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367 | |
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368 | /* |
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369 | * Utility routines for access control. |
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370 | * |
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371 | */ |
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372 | |
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373 | static int |
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374 | can_read(void) |
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375 | { |
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376 | return (ftpd_access & FTPD_NO_READ) == 0; |
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377 | } |
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378 | |
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379 | static int |
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380 | can_write(void) |
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381 | { |
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382 | return (ftpd_access & FTPD_NO_WRITE) == 0; |
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383 | } |
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384 | |
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385 | /* |
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386 | * Task pool management routines |
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387 | * |
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388 | */ |
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389 | |
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390 | |
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391 | /* |
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392 | * task_pool_done |
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393 | * |
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394 | * Cleanup task pool. |
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395 | * |
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396 | * Input parameters: |
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397 | * count - number of entries in task pool to cleanup |
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398 | * |
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399 | * Output parameters: |
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400 | * NONE |
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401 | * |
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402 | */ |
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403 | static void |
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404 | task_pool_done(int count) |
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405 | { |
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406 | int i; |
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407 | for(i = 0; i < count; ++i) |
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408 | rtems_task_delete(task_pool.info[i].tid); |
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409 | free(task_pool.info); |
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410 | free(task_pool.queue); |
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411 | rtems_mutex_destroy(&task_pool.mutex); |
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412 | rtems_counting_semaphore_destroy(&task_pool.sem); |
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413 | task_pool.info = 0; |
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414 | task_pool.queue = 0; |
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415 | task_pool.count = 0; |
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416 | } |
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417 | |
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418 | /* |
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419 | * task_pool_init |
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420 | * |
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421 | * Initialize task pool. |
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422 | * |
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423 | * Input parameters: |
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424 | * count - number of entries in task pool to create |
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425 | * priority - priority tasks are started with |
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426 | * |
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427 | * Output parameters: |
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428 | * returns 1 on success, 0 on failure. |
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429 | * |
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430 | */ |
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431 | static void session(rtems_task_argument arg); /* Forward declare */ |
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432 | |
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433 | static int |
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434 | task_pool_init(int count, rtems_task_priority priority) |
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435 | { |
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436 | int i; |
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437 | rtems_status_code sc; |
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438 | char id = 'a'; |
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439 | |
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440 | task_pool.count = 0; |
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441 | task_pool.head = task_pool.tail = 0; |
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442 | |
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443 | rtems_mutex_init(&task_pool.mutex, "FTPD"); |
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444 | rtems_counting_semaphore_init(&task_pool.sem, "FTPD", (unsigned int) count); |
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445 | |
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446 | task_pool.info = (FTPD_SessionInfo_t*) |
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447 | malloc(sizeof(FTPD_SessionInfo_t) * count); |
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448 | task_pool.queue = (FTPD_SessionInfo_t**) |
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449 | malloc(sizeof(FTPD_SessionInfo_t*) * count); |
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450 | if (NULL == task_pool.info || NULL == task_pool.queue) |
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451 | { |
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452 | task_pool_done(0); |
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453 | syslog(LOG_ERR, "ftpd: Not enough memory"); |
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454 | return 0; |
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455 | } |
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456 | |
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457 | for(i = 0; i < count; ++i) |
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458 | { |
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459 | FTPD_SessionInfo_t *info = &task_pool.info[i]; |
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460 | sc = rtems_task_create(rtems_build_name('F', 'T', 'P', id), |
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461 | priority, FTPD_STACKSIZE, |
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462 | RTEMS_PREEMPT | RTEMS_NO_TIMESLICE | |
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463 | RTEMS_NO_ASR | RTEMS_INTERRUPT_LEVEL(0), |
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464 | RTEMS_FLOATING_POINT | RTEMS_LOCAL, |
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465 | &info->tid); |
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466 | if (sc == RTEMS_SUCCESSFUL) |
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467 | { |
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468 | sc = rtems_task_start( |
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469 | info->tid, session, (rtems_task_argument)info); |
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470 | if (sc != RTEMS_SUCCESSFUL) |
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471 | task_pool_done(i); |
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472 | } |
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473 | else |
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474 | task_pool_done(i + 1); |
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475 | if (sc != RTEMS_SUCCESSFUL) |
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476 | { |
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477 | syslog(LOG_ERR, "ftpd: Could not create/start FTPD session: %s", |
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478 | rtems_status_text(sc)); |
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479 | return 0; |
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480 | } |
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481 | task_pool.queue[i] = task_pool.info + i; |
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482 | if (++id > 'z') |
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483 | id = 'a'; |
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484 | } |
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485 | task_pool.count = count; |
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486 | return 1; |
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487 | } |
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488 | |
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489 | /* |
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490 | * task_pool_obtain |
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491 | * |
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492 | * Obtain free task from task pool. |
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493 | * |
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494 | * Input parameters: |
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495 | * NONE |
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496 | * |
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497 | * Output parameters: |
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498 | * returns pointer to the corresponding SessionInfo structure on success, |
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499 | * NULL if there are no free tasks in the pool. |
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500 | * |
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501 | */ |
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502 | static FTPD_SessionInfo_t* |
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503 | task_pool_obtain(void) |
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504 | { |
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505 | FTPD_SessionInfo_t* info = 0; |
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506 | rtems_counting_semaphore_wait(&task_pool.sem); |
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507 | rtems_mutex_lock(&task_pool.mutex); |
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508 | info = task_pool.queue[task_pool.head]; |
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509 | if(++task_pool.head >= task_pool.count) |
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510 | task_pool.head = 0; |
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511 | rtems_mutex_unlock(&task_pool.mutex); |
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512 | return info; |
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513 | } |
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514 | |
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515 | /* |
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516 | * task_pool_release |
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517 | * |
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518 | * Return task obtained by 'obtain()' back to the task pool. |
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519 | * |
---|
520 | * Input parameters: |
---|
521 | * info - pointer to corresponding SessionInfo structure. |
---|
522 | * |
---|
523 | * Output parameters: |
---|
524 | * NONE |
---|
525 | * |
---|
526 | */ |
---|
527 | static void |
---|
528 | task_pool_release(FTPD_SessionInfo_t* info) |
---|
529 | { |
---|
530 | rtems_mutex_lock(&task_pool.mutex); |
---|
531 | task_pool.queue[task_pool.tail] = info; |
---|
532 | if(++task_pool.tail >= task_pool.count) |
---|
533 | task_pool.tail = 0; |
---|
534 | rtems_mutex_unlock(&task_pool.mutex); |
---|
535 | rtems_counting_semaphore_post(&task_pool.sem); |
---|
536 | } |
---|
537 | |
---|
538 | /* |
---|
539 | * End of task pool routines |
---|
540 | */ |
---|
541 | |
---|
542 | /* |
---|
543 | * Function: send_reply |
---|
544 | * |
---|
545 | * |
---|
546 | * This procedure sends a reply to the client via the control |
---|
547 | * connection. |
---|
548 | * |
---|
549 | * |
---|
550 | * Input parameters: |
---|
551 | * code - 3-digit reply code. |
---|
552 | * text - Reply text. |
---|
553 | * |
---|
554 | * Output parameters: |
---|
555 | * NONE |
---|
556 | */ |
---|
557 | static void |
---|
558 | send_reply(FTPD_SessionInfo_t *info, int code, const char *text) |
---|
559 | { |
---|
560 | text = text != NULL ? text : ""; |
---|
561 | fprintf(info->ctrl_fp, "%d %.70s\r\n", code, text); |
---|
562 | fflush(info->ctrl_fp); |
---|
563 | } |
---|
564 | |
---|
565 | |
---|
566 | /* |
---|
567 | * close_socket |
---|
568 | * |
---|
569 | * Close socket. |
---|
570 | * |
---|
571 | * Input parameters: |
---|
572 | * s - socket descriptor. |
---|
573 | * seconds - number of seconds the timeout should be, |
---|
574 | * if >= 0 - infinite timeout (no timeout). |
---|
575 | * |
---|
576 | * Output parameters: |
---|
577 | * returns 1 on success, 0 on failure. |
---|
578 | */ |
---|
579 | static void |
---|
580 | set_socket_timeout(int s, int seconds) |
---|
581 | { |
---|
582 | struct timeval tv; |
---|
583 | int len = sizeof(tv); |
---|
584 | |
---|
585 | if(seconds < 0) |
---|
586 | seconds = 0; |
---|
587 | tv.tv_usec = 0; |
---|
588 | tv.tv_sec = seconds; |
---|
589 | if(0 != setsockopt(s, SOL_SOCKET, SO_SNDTIMEO, &tv, len)) |
---|
590 | syslog(LOG_ERR, "ftpd: Can't set send timeout on socket: %s.", serr()); |
---|
591 | else if(0 != setsockopt(s, SOL_SOCKET, SO_RCVTIMEO, &tv, len)) |
---|
592 | syslog(LOG_ERR, "ftpd: Can't set receive timeout on socket: %s.", serr()); |
---|
593 | } |
---|
594 | |
---|
595 | /* |
---|
596 | * close_socket |
---|
597 | * |
---|
598 | * Close socket. |
---|
599 | * |
---|
600 | * Input parameters: |
---|
601 | * s - socket descriptor to be closed. |
---|
602 | * |
---|
603 | * Output parameters: |
---|
604 | * returns 1 on success, 0 on failure |
---|
605 | */ |
---|
606 | static int |
---|
607 | close_socket(int s) |
---|
608 | { |
---|
609 | if (0 <= s) |
---|
610 | { |
---|
611 | if (0 != close(s)) |
---|
612 | { |
---|
613 | shutdown(s, 2); |
---|
614 | if (0 != close(s)) |
---|
615 | return 0; |
---|
616 | } |
---|
617 | } |
---|
618 | return 1; |
---|
619 | } |
---|
620 | |
---|
621 | /* |
---|
622 | * data_socket |
---|
623 | * |
---|
624 | * Create data socket for session. |
---|
625 | * |
---|
626 | * Input parameters: |
---|
627 | * info - corresponding SessionInfo structure |
---|
628 | * |
---|
629 | * Output parameters: |
---|
630 | * returns socket descriptor, or -1 if failure |
---|
631 | * |
---|
632 | */ |
---|
633 | static int |
---|
634 | data_socket(FTPD_SessionInfo_t *info) |
---|
635 | { |
---|
636 | int s = info->pasv_socket; |
---|
637 | if(0 > s) |
---|
638 | { |
---|
639 | int on = 1; |
---|
640 | s = socket(PF_INET, SOCK_STREAM, 0); |
---|
641 | if(0 > s) |
---|
642 | send_reply(info, 425, "Can't create data socket."); |
---|
643 | else if(0 > setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on))) |
---|
644 | { |
---|
645 | close_socket(s); |
---|
646 | s = -1; |
---|
647 | } |
---|
648 | else |
---|
649 | { |
---|
650 | struct sockaddr_in data_source; |
---|
651 | int tries; |
---|
652 | |
---|
653 | /* anchor socket to avoid multi-homing problems */ |
---|
654 | data_source = info->ctrl_addr; |
---|
655 | data_source.sin_port = htons(20); /* ftp-data port */ |
---|
656 | for(tries = 1; tries < 10; ++tries) |
---|
657 | { |
---|
658 | errno = 0; |
---|
659 | if(bind(s, (struct sockaddr *)&data_source, sizeof(data_source)) >= 0) |
---|
660 | break; |
---|
661 | if (errno != EADDRINUSE) |
---|
662 | tries = 10; |
---|
663 | else |
---|
664 | rtems_task_wake_after(tries * 10); |
---|
665 | } |
---|
666 | if(tries >= 10) |
---|
667 | { |
---|
668 | send_reply(info, 425, "Can't bind data socket."); |
---|
669 | close_socket(s); |
---|
670 | s = -1; |
---|
671 | } |
---|
672 | else |
---|
673 | { |
---|
674 | struct sockaddr_in *data_dest = |
---|
675 | (info->use_default) ? &info->def_addr : &info->data_addr; |
---|
676 | if(0 > connect(s, (struct sockaddr *)data_dest, sizeof(*data_dest))) |
---|
677 | { |
---|
678 | send_reply(info, 425, "Can't connect data socket."); |
---|
679 | close_socket(s); |
---|
680 | s = -1; |
---|
681 | } |
---|
682 | } |
---|
683 | } |
---|
684 | } |
---|
685 | info->data_socket = s; |
---|
686 | info->use_default = 1; |
---|
687 | set_socket_timeout(s, info->idle); |
---|
688 | return s; |
---|
689 | } |
---|
690 | |
---|
691 | /* |
---|
692 | * close_data_socket |
---|
693 | * |
---|
694 | * Close data socket for session. |
---|
695 | * |
---|
696 | * Input parameters: |
---|
697 | * info - corresponding SessionInfo structure |
---|
698 | * |
---|
699 | * Output parameters: |
---|
700 | * NONE |
---|
701 | * |
---|
702 | */ |
---|
703 | static void |
---|
704 | close_data_socket(FTPD_SessionInfo_t *info) |
---|
705 | { |
---|
706 | /* As at most one data socket could be open simultaneously and in some cases |
---|
707 | data_socket == pasv_socket, we select socket to close, then close it. */ |
---|
708 | int s = info->data_socket; |
---|
709 | if(0 > s) |
---|
710 | s = info->pasv_socket; |
---|
711 | if(!close_socket(s)) |
---|
712 | syslog(LOG_ERR, "ftpd: Error closing data socket."); |
---|
713 | info->data_socket = -1; |
---|
714 | info->pasv_socket = -1; |
---|
715 | info->use_default = 1; |
---|
716 | } |
---|
717 | |
---|
718 | /* |
---|
719 | * close_stream |
---|
720 | * |
---|
721 | * Close control stream of session. |
---|
722 | * |
---|
723 | * Input parameters: |
---|
724 | * info - corresponding SessionInfo structure |
---|
725 | * |
---|
726 | * Output parameters: |
---|
727 | * NONE |
---|
728 | * |
---|
729 | */ |
---|
730 | static void |
---|
731 | close_stream(FTPD_SessionInfo_t* info) |
---|
732 | { |
---|
733 | if (NULL != info->ctrl_fp) |
---|
734 | { |
---|
735 | if (0 != fclose(info->ctrl_fp)) |
---|
736 | { |
---|
737 | syslog(LOG_ERR, "ftpd: Could not close control stream: %s", serr()); |
---|
738 | } |
---|
739 | else |
---|
740 | info->ctrl_socket = -1; |
---|
741 | } |
---|
742 | |
---|
743 | if (!close_socket(info->ctrl_socket)) |
---|
744 | syslog(LOG_ERR, "ftpd: Could not close control socket: %s", serr()); |
---|
745 | |
---|
746 | info->ctrl_fp = NULL; |
---|
747 | info->ctrl_socket = -1; |
---|
748 | } |
---|
749 | |
---|
750 | |
---|
751 | /* |
---|
752 | * send_mode_reply |
---|
753 | * |
---|
754 | * Sends BINARY/ASCII reply string depending on current transfer mode. |
---|
755 | * |
---|
756 | * Input parameters: |
---|
757 | * info - corresponding SessionInfo structure |
---|
758 | * |
---|
759 | * Output parameters: |
---|
760 | * NONE |
---|
761 | * |
---|
762 | */ |
---|
763 | static void |
---|
764 | send_mode_reply(FTPD_SessionInfo_t *info) |
---|
765 | { |
---|
766 | if(info->xfer_mode == TYPE_I) |
---|
767 | send_reply(info, 150, "Opening BINARY mode data connection."); |
---|
768 | else |
---|
769 | send_reply(info, 150, "Opening ASCII mode data connection."); |
---|
770 | } |
---|
771 | |
---|
772 | /* |
---|
773 | * command_retrieve |
---|
774 | * |
---|
775 | * Perform the "RETR" command (send file to client). |
---|
776 | * |
---|
777 | * Input parameters: |
---|
778 | * info - corresponding SessionInfo structure |
---|
779 | * char *filename - source filename. |
---|
780 | * |
---|
781 | * Output parameters: |
---|
782 | * NONE |
---|
783 | * |
---|
784 | */ |
---|
785 | static void |
---|
786 | command_retrieve(FTPD_SessionInfo_t *info, char const *filename) |
---|
787 | { |
---|
788 | int s = -1; |
---|
789 | int fd = -1; |
---|
790 | char buf[FTPD_DATASIZE]; |
---|
791 | struct stat stat_buf; |
---|
792 | int res = 0; |
---|
793 | |
---|
794 | if(!can_read() || !info->auth) |
---|
795 | { |
---|
796 | send_reply(info, 550, "Access denied."); |
---|
797 | return; |
---|
798 | } |
---|
799 | |
---|
800 | if (0 > (fd = open(filename, O_RDONLY))) |
---|
801 | { |
---|
802 | send_reply(info, 550, "Error opening file."); |
---|
803 | return; |
---|
804 | } |
---|
805 | |
---|
806 | if (fstat(fd, &stat_buf) == 0 && S_ISDIR(stat_buf.st_mode)) |
---|
807 | { |
---|
808 | if (-1 != fd) |
---|
809 | close(fd); |
---|
810 | send_reply(info, 550, "Is a directory."); |
---|
811 | return; |
---|
812 | } |
---|
813 | |
---|
814 | send_mode_reply(info); |
---|
815 | |
---|
816 | s = data_socket(info); |
---|
817 | |
---|
818 | if (0 <= s) |
---|
819 | { |
---|
820 | int n = -1; |
---|
821 | |
---|
822 | if(info->xfer_mode == TYPE_I) |
---|
823 | { |
---|
824 | while ((n = read(fd, buf, FTPD_DATASIZE)) > 0) |
---|
825 | { |
---|
826 | if(send(s, buf, n, 0) != n) |
---|
827 | break; |
---|
828 | yield(); |
---|
829 | } |
---|
830 | } |
---|
831 | else if (info->xfer_mode == TYPE_A) |
---|
832 | { |
---|
833 | int rest = 0; |
---|
834 | while (rest == 0 && (n = read(fd, buf, FTPD_DATASIZE)) > 0) |
---|
835 | { |
---|
836 | char const* e = buf; |
---|
837 | char const* b; |
---|
838 | int i; |
---|
839 | rest = n; |
---|
840 | do |
---|
841 | { |
---|
842 | char lf = '\0'; |
---|
843 | |
---|
844 | b = e; |
---|
845 | for(i = 0; i < rest; ++i, ++e) |
---|
846 | { |
---|
847 | if(*e == '\n') |
---|
848 | { |
---|
849 | lf = '\n'; |
---|
850 | break; |
---|
851 | } |
---|
852 | } |
---|
853 | if(send(s, b, i, 0) != i) |
---|
854 | break; |
---|
855 | if(lf == '\n') |
---|
856 | { |
---|
857 | if(send(s, "\r\n", 2, 0) != 2) |
---|
858 | break; |
---|
859 | ++e; |
---|
860 | ++i; |
---|
861 | } |
---|
862 | } |
---|
863 | while((rest -= i) > 0); |
---|
864 | yield(); |
---|
865 | } |
---|
866 | } |
---|
867 | |
---|
868 | if (0 == n) |
---|
869 | { |
---|
870 | if (0 == close(fd)) |
---|
871 | { |
---|
872 | fd = -1; |
---|
873 | res = 1; |
---|
874 | } |
---|
875 | } |
---|
876 | } |
---|
877 | |
---|
878 | if (-1 != fd) |
---|
879 | close(fd); |
---|
880 | |
---|
881 | if (0 == res) |
---|
882 | send_reply(info, 451, "File read error."); |
---|
883 | else |
---|
884 | send_reply(info, 226, "Transfer complete."); |
---|
885 | |
---|
886 | close_data_socket(info); |
---|
887 | |
---|
888 | return; |
---|
889 | } |
---|
890 | |
---|
891 | |
---|
892 | /* |
---|
893 | * discard |
---|
894 | * |
---|
895 | * Analog of `write' routine that just discards passed data |
---|
896 | * |
---|
897 | * Input parameters: |
---|
898 | * fd - file descriptor (ignored) |
---|
899 | * buf - data to write (ignored) |
---|
900 | * count - number of bytes in `buf' |
---|
901 | * |
---|
902 | * Output parameters: |
---|
903 | * returns `count' |
---|
904 | * |
---|
905 | */ |
---|
906 | static ssize_t |
---|
907 | discard(int fd, void const* buf, size_t count) |
---|
908 | { |
---|
909 | (void)fd; |
---|
910 | (void)buf; |
---|
911 | return count; |
---|
912 | } |
---|
913 | |
---|
914 | /* |
---|
915 | * command_store |
---|
916 | * |
---|
917 | * Performs the "STOR" command (receive data from client). |
---|
918 | * |
---|
919 | * Input parameters: |
---|
920 | * info - corresponding SessionInfo structure |
---|
921 | * char *filename - Destination filename. |
---|
922 | * |
---|
923 | * Output parameters: |
---|
924 | * NONE |
---|
925 | */ |
---|
926 | static void |
---|
927 | command_store(FTPD_SessionInfo_t *info, char const *filename) |
---|
928 | { |
---|
929 | int s; |
---|
930 | int n; |
---|
931 | unsigned long size = 0; |
---|
932 | struct rtems_ftpd_hook *usehook = NULL; |
---|
933 | char buf[FTPD_DATASIZE]; |
---|
934 | int res = 1; |
---|
935 | int bare_lfs = 0; |
---|
936 | int null = 0; |
---|
937 | typedef ssize_t (*WriteProc)(int, void const*, size_t); |
---|
938 | WriteProc wrt = &write; |
---|
939 | |
---|
940 | if(!can_write() || !info->auth) |
---|
941 | { |
---|
942 | send_reply(info, 550, "Access denied."); |
---|
943 | return; |
---|
944 | } |
---|
945 | |
---|
946 | send_mode_reply(info); |
---|
947 | |
---|
948 | s = data_socket(info); |
---|
949 | if(0 > s) |
---|
950 | return; |
---|
951 | |
---|
952 | null = !strcmp("/dev/null", filename); |
---|
953 | if (null) |
---|
954 | { |
---|
955 | /* File "/dev/null" just throws data away. |
---|
956 | * FIXME: this is hack. Using `/dev/null' filesystem entry would be |
---|
957 | * better. |
---|
958 | */ |
---|
959 | wrt = &discard; |
---|
960 | } |
---|
961 | |
---|
962 | if (!null && ftpd_config->hooks != NULL) |
---|
963 | { |
---|
964 | |
---|
965 | /* Search our list of hooks to see if we need to do something special. */ |
---|
966 | struct rtems_ftpd_hook *hook; |
---|
967 | int i; |
---|
968 | |
---|
969 | i = 0; |
---|
970 | hook = &ftpd_config->hooks[i++]; |
---|
971 | while (hook->filename != NULL) |
---|
972 | { |
---|
973 | if (!strcmp(hook->filename, filename)) |
---|
974 | { |
---|
975 | usehook = hook; |
---|
976 | break; |
---|
977 | } |
---|
978 | hook = &ftpd_config->hooks[i++]; |
---|
979 | } |
---|
980 | } |
---|
981 | |
---|
982 | if (usehook != NULL) |
---|
983 | { |
---|
984 | /* |
---|
985 | * OSV: FIXME: Small buffer could be used and hook routine |
---|
986 | * called multiple times instead. Alternatively, the support could be |
---|
987 | * removed entirely in favor of configuring RTEMS pseudo-device with |
---|
988 | * given name. |
---|
989 | */ |
---|
990 | |
---|
991 | char *bigBufr; |
---|
992 | size_t filesize = ftpd_config->max_hook_filesize + 1; |
---|
993 | |
---|
994 | /* |
---|
995 | * Allocate space for our "file". |
---|
996 | */ |
---|
997 | bigBufr = (char *)malloc(filesize); |
---|
998 | if (bigBufr == NULL) |
---|
999 | { |
---|
1000 | send_reply(info, 451, "Local resource failure: malloc."); |
---|
1001 | close_data_socket(info); |
---|
1002 | return; |
---|
1003 | } |
---|
1004 | |
---|
1005 | /* |
---|
1006 | * Retrieve the file into our buffer space. |
---|
1007 | */ |
---|
1008 | size = 0; |
---|
1009 | while ((n = recv(s, bigBufr + size, filesize - size, 0)) > 0) |
---|
1010 | { |
---|
1011 | size += n; |
---|
1012 | } |
---|
1013 | if (size >= filesize) |
---|
1014 | { |
---|
1015 | send_reply(info, 451, "File too long: buffer size exceeded."); |
---|
1016 | free(bigBufr); |
---|
1017 | close_data_socket(info); |
---|
1018 | return; |
---|
1019 | } |
---|
1020 | |
---|
1021 | /* |
---|
1022 | * Call our hook. |
---|
1023 | */ |
---|
1024 | res = (usehook->hook_function)(bigBufr, size) == 0; |
---|
1025 | free(bigBufr); |
---|
1026 | if(!res) |
---|
1027 | { |
---|
1028 | send_reply(info, 451, "File processing failed."); |
---|
1029 | close_data_socket(info); |
---|
1030 | return; |
---|
1031 | } |
---|
1032 | } |
---|
1033 | else |
---|
1034 | { |
---|
1035 | /* Data transfer to regular file or /dev/null. */ |
---|
1036 | int fd = 0; |
---|
1037 | |
---|
1038 | if(!null) |
---|
1039 | fd = creat(filename, |
---|
1040 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); |
---|
1041 | |
---|
1042 | if (0 > fd) |
---|
1043 | { |
---|
1044 | send_reply(info, 550, "Error creating file."); |
---|
1045 | close_data_socket(info); |
---|
1046 | return; |
---|
1047 | } |
---|
1048 | |
---|
1049 | if(info->xfer_mode == TYPE_I) |
---|
1050 | { |
---|
1051 | while ((n = recv(s, buf, FTPD_DATASIZE, 0)) > 0) |
---|
1052 | { |
---|
1053 | if (wrt(fd, buf, n) != n) |
---|
1054 | { |
---|
1055 | res = 0; |
---|
1056 | break; |
---|
1057 | } |
---|
1058 | yield(); |
---|
1059 | } |
---|
1060 | } |
---|
1061 | else if(info->xfer_mode == TYPE_A) |
---|
1062 | { |
---|
1063 | int rest = 0; |
---|
1064 | int pended_cr = 0; |
---|
1065 | while (res && rest == 0 && (n = recv(s, buf, FTPD_DATASIZE, 0)) > 0) |
---|
1066 | { |
---|
1067 | char const* e = buf; |
---|
1068 | char const* b; |
---|
1069 | int i; |
---|
1070 | |
---|
1071 | rest = n; |
---|
1072 | if(pended_cr && *e != '\n') |
---|
1073 | { |
---|
1074 | char const lf = '\r'; |
---|
1075 | pended_cr = 0; |
---|
1076 | if(wrt(fd, &lf, 1) != 1) |
---|
1077 | { |
---|
1078 | res = 0; |
---|
1079 | break; |
---|
1080 | } |
---|
1081 | } |
---|
1082 | do |
---|
1083 | { |
---|
1084 | int count; |
---|
1085 | int sub = 0; |
---|
1086 | |
---|
1087 | b = e; |
---|
1088 | for(i = 0; i < rest; ++i, ++e) |
---|
1089 | { |
---|
1090 | int pcr = pended_cr; |
---|
1091 | pended_cr = 0; |
---|
1092 | if(*e == '\r') |
---|
1093 | { |
---|
1094 | pended_cr = 1; |
---|
1095 | } |
---|
1096 | else if(*e == '\n') |
---|
1097 | { |
---|
1098 | if(pcr) |
---|
1099 | { |
---|
1100 | sub = 2; |
---|
1101 | ++i; |
---|
1102 | ++e; |
---|
1103 | break; |
---|
1104 | } |
---|
1105 | ++bare_lfs; |
---|
1106 | } |
---|
1107 | } |
---|
1108 | if(res == 0) |
---|
1109 | break; |
---|
1110 | count = i - sub - pended_cr; |
---|
1111 | if(count > 0 && wrt(fd, b, count) != count) |
---|
1112 | { |
---|
1113 | res = 0; |
---|
1114 | break; |
---|
1115 | } |
---|
1116 | if(sub == 2 && wrt(fd, e - 1, 1) != 1) |
---|
1117 | res = 0; |
---|
1118 | } |
---|
1119 | while((rest -= i) > 0); |
---|
1120 | yield(); |
---|
1121 | } |
---|
1122 | } |
---|
1123 | |
---|
1124 | if (0 > close(fd) || res == 0) |
---|
1125 | { |
---|
1126 | send_reply(info, 452, "Error writing file."); |
---|
1127 | close_data_socket(info); |
---|
1128 | return; |
---|
1129 | } |
---|
1130 | } |
---|
1131 | |
---|
1132 | if (bare_lfs > 0) |
---|
1133 | { |
---|
1134 | snprintf(buf, FTPD_BUFSIZE, |
---|
1135 | "Transfer complete. WARNING! %d bare linefeeds received in ASCII mode.", |
---|
1136 | bare_lfs); |
---|
1137 | send_reply(info, 226, buf); |
---|
1138 | } |
---|
1139 | else |
---|
1140 | send_reply(info, 226, "Transfer complete."); |
---|
1141 | close_data_socket(info); |
---|
1142 | |
---|
1143 | } |
---|
1144 | |
---|
1145 | |
---|
1146 | /* |
---|
1147 | * send_dirline |
---|
1148 | * |
---|
1149 | * Sends one line of LIST command reply corresponding to single file. |
---|
1150 | * |
---|
1151 | * Input parameters: |
---|
1152 | * s - socket descriptor to send data to |
---|
1153 | * wide - if 0, send only file name. If not 0, send 'stat' info as well in |
---|
1154 | * "ls -l" format. |
---|
1155 | * curTime - current time |
---|
1156 | * path - path to be prepended to what is given by 'add' |
---|
1157 | * add - path to be appended to what is given by 'path', the resulting path |
---|
1158 | * is then passed to 'stat()' routine |
---|
1159 | * name - file name to be reported in output |
---|
1160 | * buf - buffer for temporary data |
---|
1161 | * |
---|
1162 | * Output parameters: |
---|
1163 | * returns false on failure, true on success |
---|
1164 | * |
---|
1165 | */ |
---|
1166 | static bool |
---|
1167 | send_dirline(int s, bool wide, time_t curTime, char const* path, |
---|
1168 | char const* add, char const* fname, char* buf) |
---|
1169 | { |
---|
1170 | struct stat stat_buf; |
---|
1171 | size_t plen = strlen(path); |
---|
1172 | size_t alen = strlen(add); |
---|
1173 | int slen = 0; |
---|
1174 | |
---|
1175 | if(plen == 0) |
---|
1176 | { |
---|
1177 | buf[plen++] = '/'; |
---|
1178 | buf[plen] = '\0'; |
---|
1179 | } |
---|
1180 | else |
---|
1181 | { |
---|
1182 | buf = memcpy(buf, path, plen + 1); |
---|
1183 | if(alen > 0 && buf[plen - 1] != '/') |
---|
1184 | { |
---|
1185 | buf[plen++] = '/'; |
---|
1186 | if(plen >= FTPD_BUFSIZE) |
---|
1187 | return 0; |
---|
1188 | buf[plen] = '\0'; |
---|
1189 | } |
---|
1190 | } |
---|
1191 | if(plen + alen >= FTPD_BUFSIZE) |
---|
1192 | return 0; |
---|
1193 | memcpy(buf + plen, add, alen + 1); |
---|
1194 | |
---|
1195 | if (stat(buf, &stat_buf) == 0) |
---|
1196 | { |
---|
1197 | if (wide) |
---|
1198 | { |
---|
1199 | struct tm bt; |
---|
1200 | time_t tf = stat_buf.st_mtime; |
---|
1201 | enum { SIZE = 80 }; |
---|
1202 | time_t SIX_MONTHS = (365L*24L*60L*60L)/2L; |
---|
1203 | char timeBuf[SIZE]; |
---|
1204 | gmtime_r(&tf, &bt); |
---|
1205 | if(curTime > tf + SIX_MONTHS || tf > curTime + SIX_MONTHS) |
---|
1206 | strftime (timeBuf, SIZE, "%b %d %Y", &bt); |
---|
1207 | else |
---|
1208 | strftime (timeBuf, SIZE, "%b %d %H:%M", &bt); |
---|
1209 | |
---|
1210 | slen = snprintf(buf, FTPD_BUFSIZE, |
---|
1211 | "%c%c%c%c%c%c%c%c%c%c 1 %5d %5d %11u %s %s\r\n", |
---|
1212 | (S_ISLNK(stat_buf.st_mode)?('l'): |
---|
1213 | (S_ISDIR(stat_buf.st_mode)?('d'):('-'))), |
---|
1214 | (stat_buf.st_mode & S_IRUSR)?('r'):('-'), |
---|
1215 | (stat_buf.st_mode & S_IWUSR)?('w'):('-'), |
---|
1216 | (stat_buf.st_mode & S_IXUSR)?('x'):('-'), |
---|
1217 | (stat_buf.st_mode & S_IRGRP)?('r'):('-'), |
---|
1218 | (stat_buf.st_mode & S_IWGRP)?('w'):('-'), |
---|
1219 | (stat_buf.st_mode & S_IXGRP)?('x'):('-'), |
---|
1220 | (stat_buf.st_mode & S_IROTH)?('r'):('-'), |
---|
1221 | (stat_buf.st_mode & S_IWOTH)?('w'):('-'), |
---|
1222 | (stat_buf.st_mode & S_IXOTH)?('x'):('-'), |
---|
1223 | (int)stat_buf.st_uid, |
---|
1224 | (int)stat_buf.st_gid, |
---|
1225 | (int)stat_buf.st_size, |
---|
1226 | timeBuf, |
---|
1227 | fname |
---|
1228 | ); |
---|
1229 | } |
---|
1230 | else |
---|
1231 | { |
---|
1232 | slen = snprintf(buf, FTPD_BUFSIZE, "%s\r\n", fname); |
---|
1233 | } |
---|
1234 | } |
---|
1235 | else |
---|
1236 | { |
---|
1237 | slen = snprintf(buf, FTPD_BUFSIZE, "%s: %s.\r\n", fname, strerror(errno)); |
---|
1238 | } |
---|
1239 | |
---|
1240 | if (slen >= FTPD_BUFSIZE) |
---|
1241 | { |
---|
1242 | static const char dots[] = { '.', '.', '.', '\r', '\n' }; |
---|
1243 | |
---|
1244 | /* |
---|
1245 | * The file name exceeds the send buffer, indicate this with a ... at the |
---|
1246 | * end of the line. |
---|
1247 | */ |
---|
1248 | slen = FTPD_BUFSIZE - 1; |
---|
1249 | memcpy(&buf[slen - sizeof(dots)], dots, sizeof(dots)); |
---|
1250 | } |
---|
1251 | |
---|
1252 | if (slen > 0 && send(s, buf, (size_t) slen, 0) != slen) |
---|
1253 | return false; |
---|
1254 | |
---|
1255 | return true; |
---|
1256 | } |
---|
1257 | |
---|
1258 | /* |
---|
1259 | * command_list |
---|
1260 | * |
---|
1261 | * Send file list to client. |
---|
1262 | * |
---|
1263 | * Input parameters: |
---|
1264 | * info - corresponding SessionInfo structure |
---|
1265 | * char *fname - File (or directory) to list. |
---|
1266 | * |
---|
1267 | * Output parameters: |
---|
1268 | * NONE |
---|
1269 | */ |
---|
1270 | static void |
---|
1271 | command_list(FTPD_SessionInfo_t *info, char const *fname, bool wide) |
---|
1272 | { |
---|
1273 | int s; |
---|
1274 | DIR *dirp = 0; |
---|
1275 | struct dirent *dp = 0; |
---|
1276 | char buf[FTPD_BUFSIZE]; |
---|
1277 | time_t curTime; |
---|
1278 | bool ok = true; |
---|
1279 | |
---|
1280 | if(!info->auth) |
---|
1281 | { |
---|
1282 | send_reply(info, 550, "Access denied."); |
---|
1283 | return; |
---|
1284 | } |
---|
1285 | |
---|
1286 | send_reply(info, 150, "Opening ASCII mode data connection for LIST."); |
---|
1287 | |
---|
1288 | s = data_socket(info); |
---|
1289 | if(0 > s) |
---|
1290 | { |
---|
1291 | syslog(LOG_ERR, "ftpd: Error connecting to data socket."); |
---|
1292 | return; |
---|
1293 | } |
---|
1294 | |
---|
1295 | if (fname[0] == '\0') |
---|
1296 | fname = "."; |
---|
1297 | |
---|
1298 | time(&curTime); |
---|
1299 | dirp = opendir(fname); |
---|
1300 | if (dirp != NULL) |
---|
1301 | { |
---|
1302 | /* FIXME: need "." and ".." only when '-a' option is given */ |
---|
1303 | ok = ok && send_dirline(s, wide, curTime, fname, "", ".", buf); |
---|
1304 | ok = ok && send_dirline(s, wide, curTime, fname, |
---|
1305 | (strcmp(fname, ftpd_root) ? ".." : ""), "..", buf); |
---|
1306 | |
---|
1307 | while (ok && (dp = readdir(dirp)) != NULL) |
---|
1308 | ok = ok && |
---|
1309 | send_dirline(s, wide, curTime, fname, dp->d_name, dp->d_name, buf); |
---|
1310 | |
---|
1311 | closedir(dirp); |
---|
1312 | } |
---|
1313 | else |
---|
1314 | { |
---|
1315 | send_dirline(s, wide, curTime, fname, "", fname, buf); |
---|
1316 | } |
---|
1317 | |
---|
1318 | close_data_socket(info); |
---|
1319 | |
---|
1320 | if (ok) |
---|
1321 | send_reply(info, 226, "Transfer complete."); |
---|
1322 | else |
---|
1323 | send_reply(info, 426, "Connection aborted."); |
---|
1324 | } |
---|
1325 | |
---|
1326 | |
---|
1327 | /* |
---|
1328 | * command_cwd |
---|
1329 | * |
---|
1330 | * Change current working directory. |
---|
1331 | * |
---|
1332 | * Input parameters: |
---|
1333 | * info - corresponding SessionInfo structure |
---|
1334 | * dir - directory name passed in CWD command |
---|
1335 | * |
---|
1336 | * Output parameters: |
---|
1337 | * NONE |
---|
1338 | * |
---|
1339 | */ |
---|
1340 | static void |
---|
1341 | command_cwd(FTPD_SessionInfo_t *info, const char *dir) |
---|
1342 | { |
---|
1343 | if(!info->auth) |
---|
1344 | { |
---|
1345 | send_reply(info, 550, "Access denied."); |
---|
1346 | return; |
---|
1347 | } |
---|
1348 | |
---|
1349 | if(chdir(dir) == 0) |
---|
1350 | send_reply(info, 250, "CWD command successful."); |
---|
1351 | else |
---|
1352 | send_reply(info, 550, "CWD command failed."); |
---|
1353 | } |
---|
1354 | |
---|
1355 | |
---|
1356 | /* |
---|
1357 | * command_pwd |
---|
1358 | * |
---|
1359 | * Send current working directory to client. |
---|
1360 | * |
---|
1361 | * Input parameters: |
---|
1362 | * info - corresponding SessionInfo structure |
---|
1363 | * |
---|
1364 | * Output parameters: |
---|
1365 | * NONE |
---|
1366 | */ |
---|
1367 | static void |
---|
1368 | command_pwd(FTPD_SessionInfo_t *info) |
---|
1369 | { |
---|
1370 | char buf[FTPD_BUFSIZE]; |
---|
1371 | char const* cwd; |
---|
1372 | errno = 0; |
---|
1373 | buf[0] = '"'; |
---|
1374 | |
---|
1375 | if(!info->auth) |
---|
1376 | { |
---|
1377 | send_reply(info, 550, "Access denied."); |
---|
1378 | return; |
---|
1379 | } |
---|
1380 | |
---|
1381 | cwd = getcwd(buf + 1, FTPD_BUFSIZE - 4); |
---|
1382 | if(cwd) |
---|
1383 | { |
---|
1384 | int len = strlen(cwd); |
---|
1385 | static char const txt[] = "\" is the current directory."; |
---|
1386 | int size = sizeof(txt); |
---|
1387 | if(len + size + 1 >= FTPD_BUFSIZE) |
---|
1388 | size = FTPD_BUFSIZE - len - 2; |
---|
1389 | memcpy(buf + len + 1, txt, size); |
---|
1390 | buf[len + size] = '\0'; |
---|
1391 | send_reply(info, 250, buf); |
---|
1392 | } |
---|
1393 | else { |
---|
1394 | snprintf(buf, FTPD_BUFSIZE, "Error: %s.", serr()); |
---|
1395 | send_reply(info, 452, buf); |
---|
1396 | } |
---|
1397 | } |
---|
1398 | |
---|
1399 | /* |
---|
1400 | * command_mdtm |
---|
1401 | * |
---|
1402 | * Handle FTP MDTM command (send file modification time to client)/ |
---|
1403 | * |
---|
1404 | * Input parameters: |
---|
1405 | * info - corresponding SessionInfo structure |
---|
1406 | * fname - file name passed in MDTM command |
---|
1407 | * |
---|
1408 | * Output parameters: |
---|
1409 | * info->cwd is set to new CWD value. |
---|
1410 | */ |
---|
1411 | static void |
---|
1412 | command_mdtm(FTPD_SessionInfo_t *info, char const* fname) |
---|
1413 | { |
---|
1414 | struct stat stbuf; |
---|
1415 | char buf[FTPD_BUFSIZE]; |
---|
1416 | |
---|
1417 | if(!info->auth) |
---|
1418 | { |
---|
1419 | send_reply(info, 550, "Access denied."); |
---|
1420 | return; |
---|
1421 | } |
---|
1422 | |
---|
1423 | if (0 > stat(fname, &stbuf)) |
---|
1424 | { |
---|
1425 | snprintf(buf, FTPD_BUFSIZE, "%s: %s.", fname, serr()); |
---|
1426 | send_reply(info, 550, buf); |
---|
1427 | } |
---|
1428 | else |
---|
1429 | { |
---|
1430 | struct tm *t = gmtime(&stbuf.st_mtime); |
---|
1431 | snprintf(buf, FTPD_BUFSIZE, "%04d%02d%02d%02d%02d%02d", |
---|
1432 | 1900 + t->tm_year, |
---|
1433 | t->tm_mon+1, t->tm_mday, |
---|
1434 | t->tm_hour, t->tm_min, t->tm_sec); |
---|
1435 | send_reply(info, 213, buf); |
---|
1436 | } |
---|
1437 | } |
---|
1438 | |
---|
1439 | static void |
---|
1440 | command_size(FTPD_SessionInfo_t *info, char const* fname) |
---|
1441 | { |
---|
1442 | struct stat stbuf; |
---|
1443 | char buf[FTPD_BUFSIZE]; |
---|
1444 | |
---|
1445 | if(!info->auth) |
---|
1446 | { |
---|
1447 | send_reply(info, 550, "Access denied."); |
---|
1448 | return; |
---|
1449 | } |
---|
1450 | |
---|
1451 | if (info->xfer_mode != TYPE_I || 0 > stat(fname, &stbuf) || stbuf.st_size < 0) |
---|
1452 | { |
---|
1453 | send_reply(info, 550, "Could not get file size."); |
---|
1454 | } |
---|
1455 | else |
---|
1456 | { |
---|
1457 | snprintf(buf, FTPD_BUFSIZE, "%" PRIuMAX, (uintmax_t) stbuf.st_size); |
---|
1458 | send_reply(info, 213, buf); |
---|
1459 | } |
---|
1460 | } |
---|
1461 | |
---|
1462 | /* |
---|
1463 | * command_port |
---|
1464 | * |
---|
1465 | * This procedure fills address for data connection given the IP address and |
---|
1466 | * port of the remote machine. |
---|
1467 | * |
---|
1468 | * Input parameters: |
---|
1469 | * info - corresponding SessionInfo structure |
---|
1470 | * args - arguments to the "PORT" command. |
---|
1471 | * |
---|
1472 | * Output parameters: |
---|
1473 | * info->data_addr is set according to arguments of the PORT command. |
---|
1474 | * info->use_default is set to 0 on success, 1 on failure. |
---|
1475 | */ |
---|
1476 | static void |
---|
1477 | command_port(FTPD_SessionInfo_t *info, char const *args) |
---|
1478 | { |
---|
1479 | enum { NUM_FIELDS = 6 }; |
---|
1480 | unsigned int a[NUM_FIELDS]; |
---|
1481 | int n; |
---|
1482 | |
---|
1483 | close_data_socket(info); |
---|
1484 | |
---|
1485 | n = sscanf(args, "%u,%u,%u,%u,%u,%u", a+0, a+1, a+2, a+3, a+4, a+5); |
---|
1486 | if(NUM_FIELDS == n) |
---|
1487 | { |
---|
1488 | int i; |
---|
1489 | union { |
---|
1490 | uint8_t b[NUM_FIELDS]; |
---|
1491 | struct { |
---|
1492 | uint32_t ip; |
---|
1493 | uint16_t port; |
---|
1494 | } u ; |
---|
1495 | } ip_info; |
---|
1496 | |
---|
1497 | for(i = 0; i < NUM_FIELDS; ++i) |
---|
1498 | { |
---|
1499 | if(a[i] > 255) |
---|
1500 | break; |
---|
1501 | ip_info.b[i] = (uint8_t)a[i]; |
---|
1502 | } |
---|
1503 | |
---|
1504 | if(i == NUM_FIELDS) |
---|
1505 | { |
---|
1506 | /* Note: while it contradicts RFC959, we don't allow PORT command |
---|
1507 | * to specify IP address different from that of the originating client |
---|
1508 | * for the sake of safety. */ |
---|
1509 | if (ip_info.u.ip == info->def_addr.sin_addr.s_addr) |
---|
1510 | { |
---|
1511 | info->data_addr.sin_addr.s_addr = ip_info.u.ip; |
---|
1512 | info->data_addr.sin_port = ip_info.u.port; |
---|
1513 | info->data_addr.sin_family = AF_INET; |
---|
1514 | memset(info->data_addr.sin_zero, 0, sizeof(info->data_addr.sin_zero)); |
---|
1515 | |
---|
1516 | info->use_default = 0; |
---|
1517 | send_reply(info, 200, "PORT command successful."); |
---|
1518 | return; /* success */ |
---|
1519 | } |
---|
1520 | else |
---|
1521 | { |
---|
1522 | send_reply(info, 425, "Address doesn't match peer's IP."); |
---|
1523 | return; |
---|
1524 | } |
---|
1525 | } |
---|
1526 | } |
---|
1527 | send_reply(info, 501, "Syntax error."); |
---|
1528 | } |
---|
1529 | |
---|
1530 | |
---|
1531 | /* |
---|
1532 | * command_pasv |
---|
1533 | * |
---|
1534 | * Handle FTP PASV command. |
---|
1535 | * Open socket, listen for and accept connection on it. |
---|
1536 | * |
---|
1537 | * Input parameters: |
---|
1538 | * info - corresponding SessionInfo structure |
---|
1539 | * |
---|
1540 | * Output parameters: |
---|
1541 | * info->pasv_socket is set to the descriptor of the data socket |
---|
1542 | */ |
---|
1543 | static void |
---|
1544 | command_pasv(FTPD_SessionInfo_t *info) |
---|
1545 | { |
---|
1546 | int s = -1; |
---|
1547 | int err = 1; |
---|
1548 | |
---|
1549 | close_data_socket(info); |
---|
1550 | |
---|
1551 | s = socket(PF_INET, SOCK_STREAM, 0); |
---|
1552 | if (s < 0) |
---|
1553 | syslog(LOG_ERR, "ftpd: Error creating PASV socket: %s", serr()); |
---|
1554 | else |
---|
1555 | { |
---|
1556 | struct sockaddr_in addr; |
---|
1557 | socklen_t addrLen = sizeof(addr); |
---|
1558 | |
---|
1559 | addr = info->ctrl_addr; |
---|
1560 | addr.sin_port = htons(0); |
---|
1561 | |
---|
1562 | if (0 > bind(s, (struct sockaddr *)&addr, addrLen)) |
---|
1563 | syslog(LOG_ERR, "ftpd: Error binding PASV socket: %s", serr()); |
---|
1564 | else if (0 > listen(s, 1)) |
---|
1565 | syslog(LOG_ERR, "ftpd: Error listening on PASV socket: %s", serr()); |
---|
1566 | { |
---|
1567 | set_socket_timeout(s, info->idle); |
---|
1568 | if (0 == getsockname(s, (struct sockaddr *)&addr, &addrLen)) |
---|
1569 | { |
---|
1570 | char buf[FTPD_BUFSIZE]; |
---|
1571 | unsigned char const *ip, *p; |
---|
1572 | |
---|
1573 | ip = (unsigned char const*)&(addr.sin_addr); |
---|
1574 | p = (unsigned char const*)&(addr.sin_port); |
---|
1575 | snprintf(buf, FTPD_BUFSIZE, "Entering passive mode (%u,%u,%u,%u,%u,%u).", |
---|
1576 | ip[0], ip[1], ip[2], ip[3], p[0], p[1]); |
---|
1577 | send_reply(info, 227, buf); |
---|
1578 | |
---|
1579 | info->pasv_socket = accept(s, (struct sockaddr *)&addr, &addrLen); |
---|
1580 | if (0 > info->pasv_socket) |
---|
1581 | syslog(LOG_ERR, "ftpd: Error accepting PASV connection: %s", serr()); |
---|
1582 | else |
---|
1583 | { |
---|
1584 | close_socket(s); |
---|
1585 | s = -1; |
---|
1586 | err = 0; |
---|
1587 | } |
---|
1588 | } |
---|
1589 | else |
---|
1590 | syslog(LOG_ERR, "ftpd: Cannot get socket name: %s", serr()); |
---|
1591 | } |
---|
1592 | } |
---|
1593 | if(err) |
---|
1594 | { |
---|
1595 | /* (OSV) The note is from FreeBSD FTPD. |
---|
1596 | * Note: a response of 425 is not mentioned as a possible response to |
---|
1597 | * the PASV command in RFC959. However, it has been blessed as a |
---|
1598 | * legitimate response by Jon Postel in a telephone conversation |
---|
1599 | * with Rick Adams on 25 Jan 89. */ |
---|
1600 | send_reply(info, 425, "Can't open passive connection."); |
---|
1601 | close_socket(s); |
---|
1602 | } |
---|
1603 | } |
---|
1604 | |
---|
1605 | |
---|
1606 | /* |
---|
1607 | * skip_options |
---|
1608 | * |
---|
1609 | * Utility routine to skip options (if any) from input command. |
---|
1610 | * |
---|
1611 | * Input parameters: |
---|
1612 | * p - pointer to pointer to command |
---|
1613 | * |
---|
1614 | * Output parameters: |
---|
1615 | * p - is changed to point to first non-option argument |
---|
1616 | */ |
---|
1617 | static void |
---|
1618 | skip_options(char **p) |
---|
1619 | { |
---|
1620 | char* buf = *p; |
---|
1621 | char* last = NULL; |
---|
1622 | while(1) { |
---|
1623 | while(isspace((unsigned char)*buf)) |
---|
1624 | ++buf; |
---|
1625 | if(*buf == '-') { |
---|
1626 | if(*++buf == '-') { /* `--' should terminate options */ |
---|
1627 | if(isspace((unsigned char)*++buf)) { |
---|
1628 | last = buf; |
---|
1629 | do ++buf; |
---|
1630 | while(isspace((unsigned char)*buf)); |
---|
1631 | break; |
---|
1632 | } |
---|
1633 | } |
---|
1634 | while(*buf && !isspace((unsigned char)*buf)) |
---|
1635 | ++buf; |
---|
1636 | last = buf; |
---|
1637 | } |
---|
1638 | else |
---|
1639 | break; |
---|
1640 | } |
---|
1641 | if(last) |
---|
1642 | *last = '\0'; |
---|
1643 | *p = buf; |
---|
1644 | } |
---|
1645 | |
---|
1646 | /* |
---|
1647 | * split_command |
---|
1648 | * |
---|
1649 | * Split command into command itself, options, and arguments. Command itself |
---|
1650 | * is converted to upper case. |
---|
1651 | * |
---|
1652 | * Input parameters: |
---|
1653 | * buf - initial command string |
---|
1654 | * |
---|
1655 | * Output parameter: |
---|
1656 | * buf - is modified by inserting '\0' at ends of split entities |
---|
1657 | * cmd - upper-cased command code |
---|
1658 | * opts - string containing all the options |
---|
1659 | * args - string containing all the arguments |
---|
1660 | */ |
---|
1661 | static void |
---|
1662 | split_command(char *buf, char **cmd, char **opts, char **args) |
---|
1663 | { |
---|
1664 | char* eoc; |
---|
1665 | char* p = buf; |
---|
1666 | while(isspace((unsigned char)*p)) |
---|
1667 | ++p; |
---|
1668 | *cmd = p; |
---|
1669 | while(*p && !isspace((unsigned char)*p)) |
---|
1670 | { |
---|
1671 | *p = toupper((unsigned char)*p); |
---|
1672 | ++p; |
---|
1673 | } |
---|
1674 | eoc = p; |
---|
1675 | if(*p) |
---|
1676 | *p++ = '\0'; |
---|
1677 | while(isspace((unsigned char)*p)) |
---|
1678 | ++p; |
---|
1679 | *opts = p; |
---|
1680 | skip_options(&p); |
---|
1681 | *args = p; |
---|
1682 | if(*opts == p) |
---|
1683 | *opts = eoc; |
---|
1684 | while(*p && *p != '\r' && *p != '\n') |
---|
1685 | ++p; |
---|
1686 | if(*p) |
---|
1687 | *p++ = '\0'; |
---|
1688 | } |
---|
1689 | |
---|
1690 | /* |
---|
1691 | * exec_command |
---|
1692 | * |
---|
1693 | * Parse and execute FTP command. |
---|
1694 | * |
---|
1695 | * FIXME: This section is somewhat of a hack. We should have a better |
---|
1696 | * way to parse commands. |
---|
1697 | * |
---|
1698 | * Input parameters: |
---|
1699 | * info - corresponding SessionInfo structure |
---|
1700 | * cmd - command to be executed (upper-case) |
---|
1701 | * args - arguments of the command |
---|
1702 | * |
---|
1703 | * Output parameters: |
---|
1704 | * NONE |
---|
1705 | */ |
---|
1706 | static void |
---|
1707 | exec_command(FTPD_SessionInfo_t *info, char *cmd, char *args) |
---|
1708 | { |
---|
1709 | int wrong_command = 0; |
---|
1710 | |
---|
1711 | if (!strcmp("PORT", cmd)) |
---|
1712 | { |
---|
1713 | command_port(info, args); |
---|
1714 | } |
---|
1715 | else if (!strcmp("PASV", cmd)) |
---|
1716 | { |
---|
1717 | command_pasv(info); |
---|
1718 | } |
---|
1719 | else if (!strcmp("RETR", cmd)) |
---|
1720 | { |
---|
1721 | command_retrieve(info, args); |
---|
1722 | } |
---|
1723 | else if (!strcmp("STOR", cmd)) |
---|
1724 | { |
---|
1725 | command_store(info, args); |
---|
1726 | } |
---|
1727 | else if (!strcmp("LIST", cmd)) |
---|
1728 | { |
---|
1729 | command_list(info, args, true); |
---|
1730 | } |
---|
1731 | else if (!strcmp("NLST", cmd)) |
---|
1732 | { |
---|
1733 | command_list(info, args, false); |
---|
1734 | } |
---|
1735 | else if (!strcmp("MDTM", cmd)) |
---|
1736 | { |
---|
1737 | command_mdtm(info, args); |
---|
1738 | } |
---|
1739 | else if (!strcmp("SIZE", cmd)) |
---|
1740 | { |
---|
1741 | command_size(info, args); |
---|
1742 | } |
---|
1743 | else if (!strcmp("SYST", cmd)) |
---|
1744 | { |
---|
1745 | send_reply(info, 215, FTPD_SYSTYPE); |
---|
1746 | } |
---|
1747 | else if (!strcmp("TYPE", cmd)) |
---|
1748 | { |
---|
1749 | if (args[0] == 'I') |
---|
1750 | { |
---|
1751 | info->xfer_mode = TYPE_I; |
---|
1752 | send_reply(info, 200, "Type set to I."); |
---|
1753 | } |
---|
1754 | else if (args[0] == 'A') |
---|
1755 | { |
---|
1756 | info->xfer_mode = TYPE_A; |
---|
1757 | send_reply(info, 200, "Type set to A."); |
---|
1758 | } |
---|
1759 | else |
---|
1760 | { |
---|
1761 | info->xfer_mode = TYPE_I; |
---|
1762 | send_reply(info, 504, "Type not implemented. Set to I."); |
---|
1763 | } |
---|
1764 | } |
---|
1765 | else if (!strcmp("USER", cmd)) |
---|
1766 | { |
---|
1767 | strlcpy(info->user_buf, args, sizeof(info->user_buf)); |
---|
1768 | info->user = info->user_buf; |
---|
1769 | if (ftpd_config->login && |
---|
1770 | !ftpd_config->login(info->user, NULL)) { |
---|
1771 | info->auth = false; |
---|
1772 | send_reply(info, 331, "User name okay, need password."); |
---|
1773 | } else { |
---|
1774 | info->auth = true; |
---|
1775 | send_reply(info, 230, "User logged in."); |
---|
1776 | } |
---|
1777 | } |
---|
1778 | else if (!strcmp("PASS", cmd)) |
---|
1779 | { |
---|
1780 | if (!info->user) { |
---|
1781 | send_reply(info, 332, "Need account to log in"); |
---|
1782 | } else { |
---|
1783 | if (ftpd_config->login && |
---|
1784 | !ftpd_config->login(info->user, args)) { |
---|
1785 | info->auth = false; |
---|
1786 | send_reply(info, 530, "Not logged in."); |
---|
1787 | } else { |
---|
1788 | info->auth = true; |
---|
1789 | send_reply(info, 230, "User logged in."); |
---|
1790 | } |
---|
1791 | } |
---|
1792 | } |
---|
1793 | else if (!strcmp("DELE", cmd)) |
---|
1794 | { |
---|
1795 | if(!can_write() || !info->auth) |
---|
1796 | { |
---|
1797 | send_reply(info, 550, "Access denied."); |
---|
1798 | } |
---|
1799 | else if (unlink(args) == 0) |
---|
1800 | { |
---|
1801 | send_reply(info, 257, "DELE successful."); |
---|
1802 | } |
---|
1803 | else |
---|
1804 | { |
---|
1805 | send_reply(info, 550, "DELE failed."); |
---|
1806 | } |
---|
1807 | } |
---|
1808 | else if (!strcmp("SITE", cmd)) |
---|
1809 | { |
---|
1810 | char* opts; |
---|
1811 | split_command(args, &cmd, &opts, &args); |
---|
1812 | if(!strcmp("CHMOD", cmd)) |
---|
1813 | { |
---|
1814 | int mask; |
---|
1815 | |
---|
1816 | if(!can_write() || !info->auth) |
---|
1817 | { |
---|
1818 | send_reply(info, 550, "Access denied."); |
---|
1819 | } |
---|
1820 | else { |
---|
1821 | char *c; |
---|
1822 | c = strchr(args, ' '); |
---|
1823 | if((c != NULL) && (sscanf(args, "%o", &mask) == 1) |
---|
1824 | && (chmod(c + 1, (mode_t)mask) == 0)) |
---|
1825 | send_reply(info, 257, "CHMOD successful."); |
---|
1826 | else |
---|
1827 | send_reply(info, 550, "CHMOD failed."); |
---|
1828 | } |
---|
1829 | } |
---|
1830 | else |
---|
1831 | wrong_command = 1; |
---|
1832 | } |
---|
1833 | else if (!strcmp("RMD", cmd)) |
---|
1834 | { |
---|
1835 | if(!can_write() || !info->auth) |
---|
1836 | { |
---|
1837 | send_reply(info, 550, "Access denied."); |
---|
1838 | } |
---|
1839 | else if (rmdir(args) == 0) |
---|
1840 | { |
---|
1841 | send_reply(info, 257, "RMD successful."); |
---|
1842 | } |
---|
1843 | else |
---|
1844 | { |
---|
1845 | send_reply(info, 550, "RMD failed."); |
---|
1846 | } |
---|
1847 | } |
---|
1848 | else if (!strcmp("MKD", cmd)) |
---|
1849 | { |
---|
1850 | if(!can_write() || !info->auth) |
---|
1851 | { |
---|
1852 | send_reply(info, 550, "Access denied."); |
---|
1853 | } |
---|
1854 | else if (mkdir(args, S_IRWXU | S_IRWXG | S_IRWXO) == 0) |
---|
1855 | { |
---|
1856 | send_reply(info, 257, "MKD successful."); |
---|
1857 | } |
---|
1858 | else |
---|
1859 | { |
---|
1860 | send_reply(info, 550, "MKD failed."); |
---|
1861 | } |
---|
1862 | } |
---|
1863 | else if (!strcmp("CWD", cmd)) |
---|
1864 | { |
---|
1865 | command_cwd(info, args); |
---|
1866 | } |
---|
1867 | else if (!strcmp("CDUP", cmd)) |
---|
1868 | { |
---|
1869 | command_cwd(info, ".."); |
---|
1870 | } |
---|
1871 | else if (!strcmp("PWD", cmd)) |
---|
1872 | { |
---|
1873 | command_pwd(info); |
---|
1874 | } |
---|
1875 | else |
---|
1876 | wrong_command = 1; |
---|
1877 | |
---|
1878 | if(wrong_command) |
---|
1879 | send_reply(info, 500, "Command not understood."); |
---|
1880 | } |
---|
1881 | |
---|
1882 | |
---|
1883 | /* |
---|
1884 | * session |
---|
1885 | * |
---|
1886 | * This task handles single session. It is woken up when the FTP daemon gets a |
---|
1887 | * service request from a remote machine. Here, we watch for commands that |
---|
1888 | * will come through the control connection. These commands are then parsed |
---|
1889 | * and executed until the connection is closed, either unintentionally or |
---|
1890 | * intentionally with the "QUIT" command. |
---|
1891 | * |
---|
1892 | * Input parameters: |
---|
1893 | * arg - pointer to corresponding SessionInfo. |
---|
1894 | * |
---|
1895 | * Output parameters: |
---|
1896 | * NONE |
---|
1897 | */ |
---|
1898 | static void |
---|
1899 | session(rtems_task_argument arg) |
---|
1900 | { |
---|
1901 | FTPD_SessionInfo_t *const info = (FTPD_SessionInfo_t *)arg; |
---|
1902 | bool chroot_made = false; |
---|
1903 | |
---|
1904 | while (1) |
---|
1905 | { |
---|
1906 | rtems_event_set set; |
---|
1907 | |
---|
1908 | rtems_event_receive(FTPD_RTEMS_EVENT, RTEMS_EVENT_ANY, RTEMS_NO_TIMEOUT, |
---|
1909 | &set); |
---|
1910 | |
---|
1911 | chroot_made = chroot_made |
---|
1912 | || (rtems_libio_set_private_env() == RTEMS_SUCCESSFUL |
---|
1913 | && chroot(ftpd_root) == 0); |
---|
1914 | |
---|
1915 | /* |
---|
1916 | * The chdir() must immediately follow the chroot(), otherwise static |
---|
1917 | * analysis tools may complain about a security issue. |
---|
1918 | */ |
---|
1919 | |
---|
1920 | if (chroot_made && chdir("/") == 0) |
---|
1921 | { |
---|
1922 | send_reply(info, 220, FTPD_SERVER_MESSAGE); |
---|
1923 | |
---|
1924 | while (1) |
---|
1925 | { |
---|
1926 | char buf[FTPD_BUFSIZE]; |
---|
1927 | char *cmd, *opts, *args; |
---|
1928 | size_t len; |
---|
1929 | |
---|
1930 | if (fgets(buf, FTPD_BUFSIZE, info->ctrl_fp) == NULL) |
---|
1931 | { |
---|
1932 | syslog(LOG_INFO, "ftpd: Connection aborted."); |
---|
1933 | break; |
---|
1934 | } |
---|
1935 | |
---|
1936 | len = strlen(buf); |
---|
1937 | |
---|
1938 | if (len == 0) |
---|
1939 | continue; |
---|
1940 | |
---|
1941 | if (buf[len - 1] != '\n') |
---|
1942 | { |
---|
1943 | send_reply(info, 501, "Command line too long."); |
---|
1944 | |
---|
1945 | /* |
---|
1946 | * We could also try to continue here; however, discarding the rest |
---|
1947 | * of the current command line and figuring out when the next command |
---|
1948 | * starts with fgets() is not that easy. It would be better to avoid |
---|
1949 | * the FILE stream and just use the socket directly with send() and |
---|
1950 | * recv(). |
---|
1951 | */ |
---|
1952 | break; |
---|
1953 | } |
---|
1954 | |
---|
1955 | split_command(buf, &cmd, &opts, &args); |
---|
1956 | |
---|
1957 | if (!strcmp("QUIT", cmd)) |
---|
1958 | { |
---|
1959 | send_reply(info, 221, "Goodbye."); |
---|
1960 | break; |
---|
1961 | } |
---|
1962 | else |
---|
1963 | { |
---|
1964 | exec_command(info, cmd, args); |
---|
1965 | } |
---|
1966 | } |
---|
1967 | } |
---|
1968 | else |
---|
1969 | { |
---|
1970 | send_reply(info, 421, "Service not available, closing control connection."); |
---|
1971 | } |
---|
1972 | |
---|
1973 | /* |
---|
1974 | * Go back to the root directory. A use case is to release a current |
---|
1975 | * directory in a mounted file system on dynamic media, e.g. USB stick. |
---|
1976 | * The return value can be ignored since the next session will try do the |
---|
1977 | * operation again and an error check is performed in this case. |
---|
1978 | */ |
---|
1979 | chdir("/"); |
---|
1980 | |
---|
1981 | /* Close connection and put ourselves back into the task pool. */ |
---|
1982 | close_data_socket(info); |
---|
1983 | close_stream(info); |
---|
1984 | task_pool_release(info); |
---|
1985 | } |
---|
1986 | } |
---|
1987 | |
---|
1988 | |
---|
1989 | /* |
---|
1990 | * ftpd_daemon |
---|
1991 | * |
---|
1992 | * This task runs forever. It waits for service requests on the FTP port |
---|
1993 | * (port 21 by default). When a request is received, it opens a new session |
---|
1994 | * to handle those requests until the connection is closed. |
---|
1995 | * |
---|
1996 | * Input parameters: |
---|
1997 | * NONE |
---|
1998 | * |
---|
1999 | * Output parameters: |
---|
2000 | * NONE |
---|
2001 | */ |
---|
2002 | static void |
---|
2003 | ftpd_daemon(rtems_task_argument args RTEMS_UNUSED) |
---|
2004 | { |
---|
2005 | int s; |
---|
2006 | socklen_t addrLen; |
---|
2007 | struct sockaddr_in addr; |
---|
2008 | |
---|
2009 | memset(&addr, 0, sizeof(addr)); |
---|
2010 | addr.sin_family = AF_INET; |
---|
2011 | addr.sin_port = htons(ftpd_config->port); |
---|
2012 | addr.sin_addr.s_addr = htonl(INADDR_ANY); |
---|
2013 | |
---|
2014 | s = socket(PF_INET, SOCK_STREAM, 0); |
---|
2015 | if (s < 0) |
---|
2016 | syslog(LOG_ERR, "ftpd: Error creating control socket: %s", serr()); |
---|
2017 | else if (0 > bind(s, (struct sockaddr *)&addr, sizeof(addr))) |
---|
2018 | syslog(LOG_ERR, "ftpd: Error binding control socket: %s", serr()); |
---|
2019 | else if (0 > listen(s, 1)) |
---|
2020 | syslog(LOG_ERR, "ftpd: Error listening on control socket: %s", serr()); |
---|
2021 | else while (1) |
---|
2022 | { |
---|
2023 | int ss; |
---|
2024 | addrLen = sizeof(addr); |
---|
2025 | ss = accept(s, (struct sockaddr *)&addr, &addrLen); |
---|
2026 | if (0 > ss) |
---|
2027 | syslog(LOG_ERR, "ftpd: Error accepting control connection: %s", serr()); |
---|
2028 | else |
---|
2029 | { |
---|
2030 | FTPD_SessionInfo_t *info; |
---|
2031 | |
---|
2032 | set_socket_timeout(ss, ftpd_timeout); |
---|
2033 | info = task_pool_obtain(); |
---|
2034 | if (NULL == info) |
---|
2035 | { |
---|
2036 | close_socket(ss); |
---|
2037 | } |
---|
2038 | else |
---|
2039 | { |
---|
2040 | info->ctrl_socket = ss; |
---|
2041 | if ((info->ctrl_fp = fdopen(info->ctrl_socket, "r+")) == NULL) |
---|
2042 | { |
---|
2043 | syslog(LOG_ERR, "ftpd: fdopen() on socket failed: %s", serr()); |
---|
2044 | close_stream(info); |
---|
2045 | task_pool_release(info); |
---|
2046 | } |
---|
2047 | else |
---|
2048 | { |
---|
2049 | /* Initialize corresponding SessionInfo structure */ |
---|
2050 | info->def_addr = addr; |
---|
2051 | if(0 > getsockname(ss, (struct sockaddr *)&addr, &addrLen)) |
---|
2052 | { |
---|
2053 | syslog(LOG_ERR, "ftpd: getsockname(): %s", serr()); |
---|
2054 | close_stream(info); |
---|
2055 | task_pool_release(info); |
---|
2056 | } |
---|
2057 | else |
---|
2058 | { |
---|
2059 | info->use_default = 1; |
---|
2060 | info->ctrl_addr = addr; |
---|
2061 | info->pasv_socket = -1; |
---|
2062 | info->data_socket = -1; |
---|
2063 | info->xfer_mode = TYPE_A; |
---|
2064 | info->data_addr.sin_port = |
---|
2065 | htons(ntohs(info->ctrl_addr.sin_port) - 1); |
---|
2066 | info->idle = ftpd_timeout; |
---|
2067 | info->user = NULL; |
---|
2068 | if (ftpd_config->login) |
---|
2069 | info->auth = false; |
---|
2070 | else |
---|
2071 | info->auth = true; |
---|
2072 | /* Wakeup the session task. The task will call task_pool_release |
---|
2073 | after it closes connection. */ |
---|
2074 | rtems_event_send(info->tid, FTPD_RTEMS_EVENT); |
---|
2075 | } |
---|
2076 | } |
---|
2077 | } |
---|
2078 | } |
---|
2079 | } |
---|
2080 | |
---|
2081 | close(s); |
---|
2082 | rtems_task_exit(); |
---|
2083 | } |
---|
2084 | |
---|
2085 | |
---|
2086 | /* |
---|
2087 | * rtems_ftpd_start |
---|
2088 | * |
---|
2089 | * Here, we start the FTPD task which waits for FTP requests and services |
---|
2090 | * them. This procedure returns to its caller once the task is started. |
---|
2091 | * |
---|
2092 | * |
---|
2093 | * Input parameters: |
---|
2094 | * config: constant initial setup. |
---|
2095 | * Output parameters: |
---|
2096 | * returns RTEMS_SUCCESSFUL on successful start of the daemon. |
---|
2097 | */ |
---|
2098 | rtems_status_code |
---|
2099 | rtems_ftpd_start(const struct rtems_ftpd_configuration* config) |
---|
2100 | { |
---|
2101 | rtems_status_code sc; |
---|
2102 | rtems_id tid; |
---|
2103 | rtems_task_priority priority; |
---|
2104 | int count; |
---|
2105 | |
---|
2106 | if (ftpd_config != NULL) |
---|
2107 | return RTEMS_RESOURCE_IN_USE; |
---|
2108 | |
---|
2109 | ftpd_config = malloc(sizeof(*ftpd_config)); |
---|
2110 | if (ftpd_config == NULL) |
---|
2111 | return RTEMS_NO_MEMORY; |
---|
2112 | |
---|
2113 | *ftpd_config = *config; |
---|
2114 | |
---|
2115 | if (ftpd_config->port == 0) |
---|
2116 | { |
---|
2117 | ftpd_config->port = FTPD_CONTROL_PORT; |
---|
2118 | } |
---|
2119 | |
---|
2120 | if (ftpd_config->priority == 0) |
---|
2121 | { |
---|
2122 | ftpd_config->priority = 40; |
---|
2123 | } |
---|
2124 | priority = ftpd_config->priority; |
---|
2125 | |
---|
2126 | ftpd_timeout = ftpd_config->idle; |
---|
2127 | if (ftpd_timeout < 0) |
---|
2128 | ftpd_timeout = 0; |
---|
2129 | ftpd_config->idle = ftpd_timeout; |
---|
2130 | |
---|
2131 | ftpd_access = ftpd_config->access; |
---|
2132 | |
---|
2133 | ftpd_root = "/"; |
---|
2134 | if (ftpd_config->root && ftpd_config->root[0] == '/' ) |
---|
2135 | ftpd_root = ftpd_config->root; |
---|
2136 | |
---|
2137 | ftpd_config->root = ftpd_root; |
---|
2138 | |
---|
2139 | if (ftpd_config->tasks_count <= 0) |
---|
2140 | ftpd_config->tasks_count = 1; |
---|
2141 | count = ftpd_config->tasks_count; |
---|
2142 | |
---|
2143 | if (!task_pool_init(count, priority)) |
---|
2144 | { |
---|
2145 | syslog(LOG_ERR, "ftpd: Could not initialize task pool."); |
---|
2146 | return RTEMS_UNSATISFIED; |
---|
2147 | } |
---|
2148 | |
---|
2149 | sc = rtems_task_create(rtems_build_name('F', 'T', 'P', 'D'), |
---|
2150 | priority, RTEMS_MINIMUM_STACK_SIZE, |
---|
2151 | RTEMS_PREEMPT | RTEMS_NO_TIMESLICE | RTEMS_NO_ASR | |
---|
2152 | RTEMS_INTERRUPT_LEVEL(0), |
---|
2153 | RTEMS_FLOATING_POINT | RTEMS_LOCAL, |
---|
2154 | &tid); |
---|
2155 | |
---|
2156 | if (sc == RTEMS_SUCCESSFUL) |
---|
2157 | { |
---|
2158 | sc = rtems_task_start(tid, ftpd_daemon, 0); |
---|
2159 | if (sc != RTEMS_SUCCESSFUL) |
---|
2160 | rtems_task_delete(tid); |
---|
2161 | } |
---|
2162 | |
---|
2163 | if (sc != RTEMS_SUCCESSFUL) |
---|
2164 | { |
---|
2165 | task_pool_done(count); |
---|
2166 | syslog(LOG_ERR, "ftpd: Could not create/start FTP daemon: %s", |
---|
2167 | rtems_status_text(sc)); |
---|
2168 | return RTEMS_UNSATISFIED; |
---|
2169 | } |
---|
2170 | |
---|
2171 | if (ftpd_config->verbose) |
---|
2172 | syslog(LOG_INFO, "ftpd: FTP daemon started (%d session%s max)", |
---|
2173 | count, ((count > 1) ? "s" : "")); |
---|
2174 | |
---|
2175 | return RTEMS_SUCCESSFUL; |
---|
2176 | } |
---|