1 | /* FIXME: 1. Parse command is a hack. We can do better. |
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2 | * 2. Some sort of access control? |
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3 | * 3. OSV: Timeouts on sockets. |
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4 | * 4. OSV: hooks support seems to be a joke, as it requires storing of |
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5 | * entire input file in memory. Seem to be better to change it to |
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6 | * something more reasonable, like having |
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7 | * 'hook_write(void const *buf, int count)' routine that will be |
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8 | * called multiple times while file is being received. |
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9 | * 5. OSV: Remove hack with "/dev/null"? |
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10 | * 6. OSV: data_addr field of SessionInfo structure is not initialized. |
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11 | * This will lead to undefined behavior if FTP client doesn't send |
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12 | * PORT command. Seems we need to implement usage of default port |
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13 | * (ftp port - 1). I didn't find any FTP client that doesn't send |
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14 | * PORT command though. |
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15 | * 7. OSV: while server claims TYPE ASCII command succeeds (to make |
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16 | * happy some clients), ASCII mode isn't actually implemented. |
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17 | * 8. Passive Mode? |
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18 | * |
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19 | * FTP Server Daemon |
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20 | * |
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21 | * Submitted by: Jake Janovetz <janovetz@tempest.ece.uiuc.edu> |
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22 | * |
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23 | * Changed by: Sergei Organov <osv@javad.ru> (OSV) |
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24 | * Changes: |
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25 | * - use pool of pre-created threads to handle sessions |
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26 | * - LIST output now similar to what "/bin/ls -al" would output, thus |
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27 | * FTP clients could parse it. |
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28 | * - LIST NAME now works (both for files and directories) |
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29 | * - keep track of CWD for every session separately |
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30 | * - ability to specify root directory name in configuration table |
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31 | * - options sent in commands are ignored, thus LIST -al FILE works |
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32 | * - added support for NLST, CDUP and MDTM commands |
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33 | * - buffers are allocated on stack instead of heap where possible |
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34 | * - drop using of task notepad to pass parameters - use function |
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35 | * arguments instead |
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36 | * - various bug-fixes, e.g., use of PF_INET in socket() instead of |
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37 | * AF_INET, use snprintf() instead of sprintf() everywhere for safety, |
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38 | * etc. |
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39 | * |
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40 | * $Id$ |
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41 | */ |
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42 | |
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43 | /************************************************************************** |
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44 | * ftpd.c * |
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45 | ************************************************************************** |
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46 | * Description: * |
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47 | * * |
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48 | * This file contains the daemon which services requests that appear * |
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49 | * on the FTP port. This server is compatible with FTP, but it * |
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50 | * also provides 'hooks' to make it usable in situations where files * |
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51 | * are not used/necessary. Once the server is started, it runs * |
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52 | * forever. * |
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53 | * * |
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54 | * * |
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55 | * Organization: * |
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56 | * * |
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57 | * The FTP daemon is started upon boot along with a (configurable) * |
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58 | * number of tasks to handle sessions. It runs all the time and * |
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59 | * waits for connections on the known FTP port (21). When * |
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60 | * a connection is made, it wakeups a 'session' task. That * |
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61 | * session then interacts with the remote host. When the session * |
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62 | * is complete, the session task goes to sleep. The daemon still * |
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63 | * runs, however. * |
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64 | * * |
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65 | * * |
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66 | * Supported commands are: * |
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67 | * * |
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68 | * RETR xxx - Sends a file from the client. * |
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69 | * STOR xxx - Receives a file from the client. xxx = filename. * |
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70 | * LIST xxx - Sends a file list to the client. * |
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71 | * NLST xxx - Sends a file list to the client. * |
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72 | * USER - Does nothing. * |
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73 | * PASS - Does nothing. * |
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74 | * SYST - Replies with the system type (`RTEMS'). * |
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75 | * DELE xxx - Delete file xxx. * |
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76 | * MKD xxx - Create directory xxx. * |
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77 | * RMD xxx - Remove directory xxx. * |
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78 | * PWD - Print working directory. * |
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79 | * CWD xxx - Change working directory. * |
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80 | * CDUP - Change to upper directory. * |
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81 | * SITE CHMOD xxx yyy - Change permissions on file yyy to xxx. * |
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82 | * PORT a,b,c,d,x,y - Setup for a data port to IP address a.b.c.d * |
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83 | * and port (x*256 + y). * |
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84 | * MDTM xxx - Send date/time to the client. xxx = filename. * |
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85 | * * |
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86 | * * |
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87 | * The public routines contained in this file are: * |
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88 | * * |
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89 | * rtems_initialize_ftpd - Initializes and starts the server daemon, * |
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90 | * then returns to its caller. * |
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91 | * * |
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92 | *------------------------------------------------------------------------* |
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93 | * Jake Janovetz * |
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94 | * University of Illinois * |
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95 | * 1406 West Green Street * |
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96 | * Urbana IL 61801 * |
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97 | ************************************************************************** |
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98 | * Change History: * |
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99 | * 12/01/97 - Creation (JWJ) * |
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100 | * 2001-01-08 - Changes by OSV * |
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101 | *************************************************************************/ |
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102 | |
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103 | /************************************************************************** |
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104 | * Meanings of first and second digits of reply codes: |
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105 | * |
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106 | * Reply: Description: |
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107 | *-------- -------------- |
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108 | * 1yz Positive preliminary reply. The action is being started but |
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109 | * expect another reply before sending another command. |
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110 | * 2yz Positive completion reply. A new command can be sent. |
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111 | * 3yz Positive intermediate reply. The command has been accpeted |
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112 | * but another command must be sent. |
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113 | * 4yz Transient negative completion reply. The requested action did |
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114 | * not take place, but the error condition is temporary so the |
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115 | * command can be reissued later. |
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116 | * 5yz Permanent negative completion reply. The command was not |
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117 | * accepted and should not be retried. |
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118 | *------------------------------------------------------------------------- |
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119 | * x0z Syntax errors. |
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120 | * x1z Information. |
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121 | * x2z Connections. Replies referring to the control or data |
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122 | * connections. |
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123 | * x3z Authentication and accounting. Replies for the login or |
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124 | * accounting commands. |
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125 | * x4z Unspecified. |
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126 | * x5z Filesystem status. |
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127 | *************************************************************************/ |
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128 | |
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129 | #include <stdio.h> |
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130 | #include <stdlib.h> |
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131 | #include <string.h> |
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132 | #include <unistd.h> |
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133 | #include <fcntl.h> |
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134 | #include <dirent.h> |
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135 | #include <errno.h> |
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136 | |
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137 | #include <rtems.h> |
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138 | #include <rtems/rtems_bsdnet.h> |
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139 | #include <rtems/error.h> |
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140 | #include <syslog.h> |
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141 | |
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142 | #include <sys/types.h> |
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143 | #include <sys/socket.h> |
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144 | #include <arpa/ftp.h> |
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145 | #include <netinet/in.h> |
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146 | |
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147 | #include "ftpd.h" |
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148 | |
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149 | |
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150 | #ifdef __GNUC__ |
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151 | /* change to #if 1 to disable syslog entirely */ |
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152 | #if 0 |
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153 | #undef syslog |
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154 | #define syslog(a, b, ...) while(0){} |
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155 | #endif |
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156 | #endif |
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157 | |
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158 | #define FTPD_SERVER_MESSAGE "RTEMS FTP server (Version 1.1-JWJ) ready." |
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159 | |
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160 | #define FTPD_SYSTYPE "RTEMS" |
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161 | |
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162 | /* Seem to be unused */ |
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163 | #if 0 |
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164 | #define FTPD_WELCOME_MESSAGE \ |
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165 | "Welcome to the RTEMS FTP server.\n" \ |
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166 | "\n" \ |
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167 | "Login accepted.\n" |
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168 | #endif |
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169 | |
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170 | /* Various buffer sizes */ |
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171 | enum |
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172 | { |
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173 | FTPD_BUFSIZE = 256, /* Size for temporary buffers */ |
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174 | FTPD_DATASIZE = 1024, /* Size for file transfer buffers */ |
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175 | FTPD_STACKSIZE = 8 * 1024, /* Tasks stack size */ |
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176 | }; |
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177 | |
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178 | /* Event to be used by session tasks for waiting */ |
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179 | enum |
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180 | { |
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181 | FTPD_RTEMS_EVENT = RTEMS_EVENT_1 |
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182 | }; |
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183 | |
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184 | /* Configuration table */ |
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185 | extern struct rtems_ftpd_configuration rtems_ftpd_configuration; |
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186 | |
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187 | /* this is not prototyped in strict ansi mode */ |
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188 | FILE *fdopen (int fildes, const char *mode); |
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189 | |
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190 | /* |
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191 | * SessionInfo structure. |
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192 | * |
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193 | * The following structure is allocated for each session. |
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194 | */ |
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195 | typedef struct |
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196 | { |
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197 | struct sockaddr_in data_addr; /* Data address for PORT commands */ |
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198 | FILE *ctrl_fp; /* File pointer for control connection */ |
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199 | int socket; /* Socket descriptor for ctrl connection */ |
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200 | char cwd[FTPD_BUFSIZE]; /* Current working directory */ |
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201 | /* Login -- future use -- */ |
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202 | int xfer_mode; /* Transfer mode (ASCII/binary) */ |
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203 | rtems_id tid; /* Task id */ |
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204 | } FTPD_SessionInfo_t; |
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205 | |
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206 | |
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207 | /* |
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208 | * TaskPool structure. |
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209 | */ |
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210 | typedef struct |
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211 | { |
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212 | FTPD_SessionInfo_t *info; |
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213 | FTPD_SessionInfo_t **queue; |
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214 | int count; |
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215 | int head; |
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216 | int tail; |
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217 | rtems_id mutex; |
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218 | rtems_id sem; |
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219 | } FTPD_TaskPool_t; |
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220 | |
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221 | /* |
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222 | * Task pool instance. |
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223 | */ |
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224 | static FTPD_TaskPool_t task_pool; |
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225 | |
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226 | /* |
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227 | * Root node for FTPD without trailing slash. Even '/' node is denoted as |
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228 | * empty string here. |
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229 | */ |
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230 | static char root[FTPD_BUFSIZE]; |
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231 | |
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232 | |
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233 | /*PAGE |
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234 | * |
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235 | * serr |
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236 | * |
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237 | * Return errror string corresponding to current 'errno'. |
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238 | * |
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239 | */ |
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240 | static char const* |
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241 | serr(void) |
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242 | { |
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243 | return strerror(errno); |
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244 | } |
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245 | |
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246 | |
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247 | /* |
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248 | * Utility routines to manage root directory and session local |
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249 | * current working directory. |
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250 | */ |
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251 | |
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252 | |
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253 | /*PAGE |
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254 | * |
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255 | * squeeze_path |
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256 | * |
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257 | * Squeezes path according to OS rules, i.e., eliminates /./, /../, and // |
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258 | * from the path. Does nothing if the path is relative, i.e. doesn't begin |
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259 | * with '/'. The trailing slash is always removed, even when alone, i.e. "/" |
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260 | * will be "" after squeeze. |
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261 | * |
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262 | * Input parameters: |
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263 | * path - the path to be squeezed |
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264 | * |
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265 | * Output parameters: |
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266 | * path - squeezed path |
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267 | * |
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268 | */ |
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269 | static void |
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270 | squeeze_path(char* path) |
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271 | { |
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272 | if(path[0] == '/') |
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273 | { |
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274 | char* e = path + 1; |
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275 | int rest = strlen(e); |
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276 | while(rest >= 0) |
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277 | { |
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278 | int len; |
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279 | char* s = e; |
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280 | e = strchr(s, '/'); |
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281 | if(e) |
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282 | ++e; |
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283 | else |
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284 | e = s + rest + 1; |
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285 | len = e - s; |
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286 | rest -= len; |
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287 | if(len == 1 || (len == 2 && s[0] == '.')) |
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288 | { |
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289 | if(rest >= 0) |
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290 | memmove(s, e, rest + 1); |
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291 | else |
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292 | *s++ = '\0'; |
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293 | e = s; |
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294 | } |
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295 | else if(len == 3 && s[0] == '.' && s[1] == '.') |
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296 | { |
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297 | char* ps = s; |
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298 | if(ps - 1 > path) { |
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299 | do |
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300 | --ps; |
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301 | while(ps[-1] != '/'); |
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302 | } |
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303 | if(rest >= 0) |
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304 | memmove(ps, e, rest + 1); |
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305 | else |
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306 | *ps++ = '\0'; |
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307 | e = ps; |
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308 | } |
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309 | } |
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310 | if(e[-2] == '/') |
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311 | e[-2] = '\0'; |
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312 | } |
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313 | } |
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314 | |
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315 | |
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316 | /*PAGE |
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317 | * |
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318 | * make_path |
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319 | * |
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320 | * Makes full path given file name, current working directory and root |
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321 | * directory (file scope variable 'root'). |
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322 | * |
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323 | * Input parameters: |
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324 | * cwd - current working directory |
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325 | * name - file name |
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326 | * root (file scope variable) - FTPD root directory |
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327 | * |
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328 | * Output parameters: |
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329 | * buf - full path |
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330 | * returns pointer to non-root part of the 'buf', i.e. to first character |
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331 | * different from '/' after root part. |
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332 | * |
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333 | */ |
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334 | static char const* |
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335 | make_path(char* buf, char const* cwd, char const* name) |
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336 | { |
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337 | char* res = NULL; |
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338 | |
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339 | int rlen = strlen(root); |
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340 | int clen = strlen(cwd); |
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341 | int nlen = strlen(name); |
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342 | int len = rlen + nlen; |
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343 | |
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344 | if (name[0] != '/') |
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345 | { |
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346 | ++len; |
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347 | if (clen > 0) |
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348 | len += clen + 1; |
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349 | } |
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350 | |
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351 | if (FTPD_BUFSIZE > len) |
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352 | { |
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353 | char* b = buf; |
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354 | memcpy(b, root, rlen); b += rlen; |
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355 | if (name[0] != '/') |
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356 | { |
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357 | *b++ = '/'; |
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358 | if (clen > 0) |
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359 | { |
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360 | memcpy(b, cwd, clen); b += clen; |
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361 | *b++ = '/'; |
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362 | } |
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363 | } |
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364 | memcpy(b, name, nlen); b += nlen; |
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365 | *b = '\0'; |
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366 | |
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367 | res = buf + rlen; |
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368 | while(rlen-- > 0 && res[-1] == '/') |
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369 | --res; |
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370 | squeeze_path(res); |
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371 | } |
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372 | |
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373 | return res; |
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374 | } |
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375 | |
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376 | /* |
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377 | * Task pool management routines |
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378 | */ |
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379 | |
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380 | |
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381 | /*PAGE |
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382 | * |
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383 | * task_pool_done |
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384 | * |
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385 | * Cleanup task pool. |
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386 | * |
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387 | * Input parameters: |
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388 | * count - number of entries in task pool to cleanup |
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389 | * |
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390 | * Output parameters: |
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391 | * NONE |
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392 | * |
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393 | */ |
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394 | static void |
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395 | task_pool_done(int count) |
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396 | { |
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397 | int i; |
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398 | for(i = 0; i < count; ++i) |
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399 | rtems_task_delete(task_pool.info[i].tid); |
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400 | if(task_pool.info) |
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401 | free(task_pool.info); |
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402 | if(task_pool.queue) |
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403 | free(task_pool.queue); |
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404 | if(task_pool.mutex != (rtems_id)-1) |
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405 | rtems_semaphore_delete(task_pool.mutex); |
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406 | if(task_pool.sem != (rtems_id)-1) |
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407 | rtems_semaphore_delete(task_pool.sem); |
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408 | task_pool.info = 0; |
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409 | task_pool.queue = 0; |
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410 | task_pool.count = 0; |
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411 | task_pool.sem = -1; |
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412 | task_pool.mutex = -1; |
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413 | } |
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414 | |
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415 | /* Forward declare */ |
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416 | static void session(rtems_task_argument arg); |
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417 | |
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418 | /*PAGE |
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419 | * |
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420 | * task_pool_init |
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421 | * |
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422 | * Initialize task pool. |
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423 | * |
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424 | * Input parameters: |
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425 | * count - number of entries in task pool to create |
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426 | * priority - priority tasks are started with |
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427 | * |
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428 | * Output parameters: |
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429 | * returns 1 on success, 0 on failure. |
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430 | * |
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431 | */ |
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432 | static int |
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433 | task_pool_init(int count, rtems_task_priority priority) |
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434 | { |
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435 | int i; |
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436 | rtems_status_code sc; |
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437 | char id = 'a'; |
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438 | |
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439 | task_pool.count = 0; |
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440 | task_pool.head = task_pool.tail = 0; |
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441 | task_pool.mutex = (rtems_id)-1; |
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442 | task_pool.sem = (rtems_id)-1; |
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443 | |
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444 | sc = rtems_semaphore_create( |
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445 | rtems_build_name('F', 'T', 'P', 'M'), |
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446 | 1, |
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447 | RTEMS_DEFAULT_ATTRIBUTES |
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448 | | RTEMS_BINARY_SEMAPHORE |
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449 | | RTEMS_INHERIT_PRIORITY |
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450 | | RTEMS_PRIORITY, |
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451 | RTEMS_NO_PRIORITY, |
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452 | &task_pool.mutex); |
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453 | |
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454 | if(sc == RTEMS_SUCCESSFUL) |
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455 | sc = rtems_semaphore_create( |
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456 | rtems_build_name('F', 'T', 'P', 'S'), |
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457 | count, |
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458 | RTEMS_DEFAULT_ATTRIBUTES, |
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459 | RTEMS_NO_PRIORITY, |
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460 | &task_pool.sem); |
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461 | |
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462 | if(sc != RTEMS_SUCCESSFUL) { |
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463 | task_pool_done(0); |
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464 | syslog(LOG_ERR, "ftpd: Can not create semaphores"); |
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465 | return 0; |
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466 | } |
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467 | |
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468 | task_pool.info = (FTPD_SessionInfo_t*) |
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469 | malloc(sizeof(FTPD_SessionInfo_t) * count); |
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470 | task_pool.queue = (FTPD_SessionInfo_t**) |
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471 | malloc(sizeof(FTPD_SessionInfo_t*) * count); |
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472 | if (NULL == task_pool.info || NULL == task_pool.queue) |
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473 | { |
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474 | task_pool_done(0); |
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475 | syslog(LOG_ERR, "ftpd: Not enough memory"); |
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476 | return 0; |
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477 | } |
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478 | |
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479 | for(i = 0; i < count; ++i) |
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480 | { |
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481 | FTPD_SessionInfo_t *info = &task_pool.info[i]; |
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482 | sc = rtems_task_create(rtems_build_name('F', 'T', 'P', id), |
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483 | priority, FTPD_STACKSIZE, |
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484 | RTEMS_PREEMPT | RTEMS_NO_TIMESLICE | |
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485 | RTEMS_NO_ASR | RTEMS_INTERRUPT_LEVEL(0), |
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486 | RTEMS_NO_FLOATING_POINT | RTEMS_LOCAL, |
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487 | &info->tid); |
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488 | if (sc == RTEMS_SUCCESSFUL) |
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489 | { |
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490 | sc = rtems_task_start( |
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491 | info->tid, session, (rtems_task_argument)info); |
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492 | if (sc != RTEMS_SUCCESSFUL) |
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493 | task_pool_done(i); |
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494 | } |
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495 | else |
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496 | task_pool_done(i + 1); |
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497 | if (sc != RTEMS_SUCCESSFUL) |
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498 | { |
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499 | syslog(LOG_ERR, "ftpd: Could not create/start FTPD session: %s", |
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500 | rtems_status_text(sc)); |
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501 | return 0; |
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502 | } |
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503 | task_pool.queue[i] = task_pool.info + i; |
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504 | info->ctrl_fp = NULL; |
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505 | info->socket = -1; |
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506 | if (++id > 'z') |
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507 | id = 'a'; |
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508 | } |
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509 | task_pool.count = count; |
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510 | return 1; |
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511 | } |
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512 | |
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513 | /*PAGE |
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514 | * |
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515 | * task_pool_obtain |
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516 | * |
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517 | * Obtain free task from task pool. |
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518 | * |
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519 | * Input parameters: |
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520 | * NONE |
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521 | * |
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522 | * Output parameters: |
---|
523 | * returns pointer to the corresponding SessionInfo structure on success, |
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524 | * NULL if there are no free tasks in the pool. |
---|
525 | * |
---|
526 | */ |
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527 | static FTPD_SessionInfo_t* |
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528 | task_pool_obtain() |
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529 | { |
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530 | FTPD_SessionInfo_t* info = 0; |
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531 | rtems_status_code sc; |
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532 | sc = rtems_semaphore_obtain(task_pool.sem, RTEMS_NO_WAIT, RTEMS_NO_TIMEOUT); |
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533 | if (sc == RTEMS_SUCCESSFUL) |
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534 | { |
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535 | rtems_semaphore_obtain(task_pool.mutex, RTEMS_WAIT, RTEMS_NO_TIMEOUT); |
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536 | info = task_pool.queue[task_pool.head]; |
---|
537 | if(++task_pool.head >= task_pool.count) |
---|
538 | task_pool.head = 0; |
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539 | info->socket = -1; |
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540 | info->ctrl_fp = NULL; |
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541 | rtems_semaphore_release(task_pool.mutex); |
---|
542 | } |
---|
543 | return info; |
---|
544 | } |
---|
545 | |
---|
546 | /*PAGE |
---|
547 | * |
---|
548 | * task_pool_release |
---|
549 | * |
---|
550 | * Return task obtained by 'obtain()' back to the task pool. |
---|
551 | * |
---|
552 | * Input parameters: |
---|
553 | * info - pointer to corresponding SessionInfo structure. |
---|
554 | * |
---|
555 | * Output parameters: |
---|
556 | * NONE |
---|
557 | * |
---|
558 | */ |
---|
559 | static void |
---|
560 | task_pool_release(FTPD_SessionInfo_t* info) |
---|
561 | { |
---|
562 | rtems_semaphore_obtain(task_pool.mutex, RTEMS_WAIT, RTEMS_NO_TIMEOUT); |
---|
563 | task_pool.queue[task_pool.tail] = info; |
---|
564 | if(++task_pool.tail >= task_pool.count) |
---|
565 | task_pool.tail = 0; |
---|
566 | rtems_semaphore_release(task_pool.mutex); |
---|
567 | rtems_semaphore_release(task_pool.sem); |
---|
568 | } |
---|
569 | |
---|
570 | /* |
---|
571 | * End of task pool routines |
---|
572 | */ |
---|
573 | |
---|
574 | /*PAGE |
---|
575 | * |
---|
576 | * close_socket |
---|
577 | * |
---|
578 | * Close socket. |
---|
579 | * |
---|
580 | * Input parameters: |
---|
581 | * s - socket descriptor to be closed. |
---|
582 | * |
---|
583 | * Output parameters: |
---|
584 | * returns 1 on success, 0 on failure |
---|
585 | * |
---|
586 | */ |
---|
587 | static int |
---|
588 | close_socket(int s) |
---|
589 | { |
---|
590 | if (0 <= s) |
---|
591 | { |
---|
592 | if (0 != close(s)) |
---|
593 | { |
---|
594 | shutdown(s, 2); |
---|
595 | if (0 != close(s)) |
---|
596 | return 0; |
---|
597 | } |
---|
598 | } |
---|
599 | return 1; |
---|
600 | } |
---|
601 | |
---|
602 | /*PAGE |
---|
603 | * |
---|
604 | * close_stream |
---|
605 | * |
---|
606 | * Close data stream of session. |
---|
607 | * |
---|
608 | * Input parameters: |
---|
609 | * info - corresponding SessionInfo structure |
---|
610 | * |
---|
611 | * Output parameters: |
---|
612 | * NONE |
---|
613 | * |
---|
614 | */ |
---|
615 | static void |
---|
616 | close_stream(FTPD_SessionInfo_t* info) |
---|
617 | { |
---|
618 | if (NULL != info->ctrl_fp) |
---|
619 | { |
---|
620 | if (0 != fclose(info->ctrl_fp)) |
---|
621 | { |
---|
622 | syslog(LOG_ERR, "ftpd: Could not close control stream: %s", serr()); |
---|
623 | } |
---|
624 | else |
---|
625 | info->socket = -1; |
---|
626 | } |
---|
627 | |
---|
628 | if (!close_socket(info->socket)) |
---|
629 | syslog(LOG_ERR, "ftpd: Could not close control socket: %s", serr()); |
---|
630 | |
---|
631 | info->ctrl_fp = NULL; |
---|
632 | info->socket = -1; |
---|
633 | } |
---|
634 | |
---|
635 | |
---|
636 | /************************************************************************** |
---|
637 | * Function: send_reply * |
---|
638 | ************************************************************************** |
---|
639 | * Description: * |
---|
640 | * * |
---|
641 | * This procedure sends a reply to the client via the control * |
---|
642 | * connection. * |
---|
643 | * * |
---|
644 | * * |
---|
645 | * Inputs: * |
---|
646 | * * |
---|
647 | * int code - The 3-digit reply code. * |
---|
648 | * char *text - Reply text. * |
---|
649 | * * |
---|
650 | * Output: * |
---|
651 | * * |
---|
652 | * none * |
---|
653 | * * |
---|
654 | *************************************************************************/ |
---|
655 | static void |
---|
656 | send_reply(FTPD_SessionInfo_t *info, int code, char *text) |
---|
657 | { |
---|
658 | char const* s; |
---|
659 | |
---|
660 | |
---|
661 | /*********************************************************************** |
---|
662 | * code must be a 3-digit number. |
---|
663 | **********************************************************************/ |
---|
664 | if ((code < 100) || (code > 999)) |
---|
665 | { |
---|
666 | syslog(LOG_ERR, "ftpd: Code not 3-digits."); |
---|
667 | return; |
---|
668 | } |
---|
669 | |
---|
670 | /*********************************************************************** |
---|
671 | * If a text reply exists, add it to the reply data. |
---|
672 | **********************************************************************/ |
---|
673 | s = (info->xfer_mode == TYPE_A) ? "\r" : ""; |
---|
674 | if (text != NULL) |
---|
675 | fprintf(info->ctrl_fp, "%d %.70s%s\n", code, text, s); |
---|
676 | else |
---|
677 | fprintf(info->ctrl_fp, "%d%s\n", code, s); |
---|
678 | fflush(info->ctrl_fp); |
---|
679 | } |
---|
680 | |
---|
681 | |
---|
682 | /*PAGE |
---|
683 | * |
---|
684 | * send_mode_reply |
---|
685 | * |
---|
686 | * Sends BINARY/ASCII reply string depending on current transfer mode. |
---|
687 | * |
---|
688 | * Input parameters: |
---|
689 | * info - corresponding SessionInfo structure |
---|
690 | * |
---|
691 | * Output parameters: |
---|
692 | * NONE |
---|
693 | * |
---|
694 | */ |
---|
695 | static void |
---|
696 | send_mode_reply(FTPD_SessionInfo_t *info) |
---|
697 | { |
---|
698 | if(info->xfer_mode == TYPE_I) |
---|
699 | send_reply(info, 150, "Opening BINARY mode data connection."); |
---|
700 | else |
---|
701 | send_reply(info, 150, "Opening ASCII mode data connection."); |
---|
702 | } |
---|
703 | |
---|
704 | /*PAGE |
---|
705 | * |
---|
706 | * data_socket |
---|
707 | * |
---|
708 | * Create data socket for session. |
---|
709 | * |
---|
710 | * Input parameters: |
---|
711 | * info - corresponding SessionInfo structure |
---|
712 | * |
---|
713 | * Output parameters: |
---|
714 | * returns socket descriptor, or -1 if failure |
---|
715 | * |
---|
716 | */ |
---|
717 | static int |
---|
718 | data_socket(FTPD_SessionInfo_t *info) |
---|
719 | { |
---|
720 | int s = socket(PF_INET, SOCK_STREAM, 0); |
---|
721 | if(0 > s) |
---|
722 | send_reply(info, 420, "Server error - could not create socket."); |
---|
723 | else if(0 > connect(s, (struct sockaddr *)&info->data_addr, |
---|
724 | sizeof(struct sockaddr))) |
---|
725 | { |
---|
726 | send_reply(info, 420, "Server error - could not connect socket."); |
---|
727 | close_socket(s); |
---|
728 | s = -1; |
---|
729 | } |
---|
730 | return s; |
---|
731 | } |
---|
732 | |
---|
733 | /************************************************************************** |
---|
734 | * Function: command_retrieve * |
---|
735 | ************************************************************************** |
---|
736 | * Description: * |
---|
737 | * * |
---|
738 | * This performs the "RETR" command. A data connection must already * |
---|
739 | * be open (via the "PORT" command.) Here, we send the data to the * |
---|
740 | * connection. * |
---|
741 | * * |
---|
742 | * * |
---|
743 | * Inputs: * |
---|
744 | * * |
---|
745 | * char *filename - Source filename. * |
---|
746 | * * |
---|
747 | * Output: * |
---|
748 | * * |
---|
749 | * int - 0 for reply sent. * |
---|
750 | * 1 for no reply sent. * |
---|
751 | * * |
---|
752 | *************************************************************************/ |
---|
753 | static int |
---|
754 | command_retrieve(FTPD_SessionInfo_t *info, char *filename) |
---|
755 | { |
---|
756 | int s = -1; |
---|
757 | int n; |
---|
758 | int fd = -1; |
---|
759 | char buf[FTPD_DATASIZE]; |
---|
760 | int res = 0; |
---|
761 | |
---|
762 | char const* r = make_path(buf, info->cwd, filename); |
---|
763 | |
---|
764 | if (NULL == r || 0 > (fd = open(buf, O_RDONLY))) |
---|
765 | { |
---|
766 | send_reply(info, 450, "Error opening file."); |
---|
767 | return(res); |
---|
768 | } |
---|
769 | |
---|
770 | send_mode_reply(info); |
---|
771 | |
---|
772 | /*********************************************************************** |
---|
773 | * Connect to the data connection (PORT made in an earlier PORT call). |
---|
774 | **********************************************************************/ |
---|
775 | s = data_socket(info); |
---|
776 | if (0 <= s) |
---|
777 | { |
---|
778 | /*********************************************************************** |
---|
779 | * Send the data over the ether. |
---|
780 | **********************************************************************/ |
---|
781 | while ((n = read(fd, buf, FTPD_DATASIZE)) > 0) |
---|
782 | { |
---|
783 | send(s, buf, n, 0); |
---|
784 | } |
---|
785 | |
---|
786 | if (0 == n) |
---|
787 | { |
---|
788 | if (0 == close(fd)) |
---|
789 | { |
---|
790 | fd = -1; |
---|
791 | res = 1; |
---|
792 | } |
---|
793 | } |
---|
794 | } |
---|
795 | |
---|
796 | if (0 == res) |
---|
797 | send_reply(info, 450, "Retrieve failed."); |
---|
798 | else |
---|
799 | send_reply(info, 210, "File sent successfully."); |
---|
800 | |
---|
801 | if (-1 != fd) |
---|
802 | close(fd); |
---|
803 | |
---|
804 | if (!close_socket(s)) |
---|
805 | syslog(LOG_ERR, "ftpd: Error closing data socket"); |
---|
806 | |
---|
807 | return(res); |
---|
808 | } |
---|
809 | |
---|
810 | |
---|
811 | /************************************************************************** |
---|
812 | * Function: command_store * |
---|
813 | ************************************************************************** |
---|
814 | * Description: * |
---|
815 | * * |
---|
816 | * This performs the "STOR" command. A data connection must already * |
---|
817 | * be open (via the "PORT" command.) Here, we get the data from the * |
---|
818 | * connection and figure out what to do with it. * |
---|
819 | * * |
---|
820 | * * |
---|
821 | * Inputs: * |
---|
822 | * * |
---|
823 | * char *filename - Destination filename. * |
---|
824 | * * |
---|
825 | * Output: * |
---|
826 | * * |
---|
827 | * int - 0 for success. * |
---|
828 | * 1 for failure. * |
---|
829 | * * |
---|
830 | *************************************************************************/ |
---|
831 | static int |
---|
832 | command_store(FTPD_SessionInfo_t *info, char *filename) |
---|
833 | { |
---|
834 | int s; |
---|
835 | int n; |
---|
836 | unsigned long size = 0; |
---|
837 | struct rtems_ftpd_hook *usehook = NULL; |
---|
838 | char buf[FTPD_DATASIZE]; |
---|
839 | |
---|
840 | int null = !strcmp("/dev/null", filename); |
---|
841 | |
---|
842 | if(!null) |
---|
843 | { |
---|
844 | if (NULL == make_path(buf, info->cwd, filename)) |
---|
845 | { |
---|
846 | send_reply(info, 450, "Error creating file."); |
---|
847 | return(0); |
---|
848 | } |
---|
849 | } |
---|
850 | |
---|
851 | send_mode_reply(info); |
---|
852 | |
---|
853 | s = data_socket(info); |
---|
854 | if(0 > s) |
---|
855 | { |
---|
856 | return(1); |
---|
857 | } |
---|
858 | |
---|
859 | |
---|
860 | /*********************************************************************** |
---|
861 | * File: "/dev/null" just throws the data away. |
---|
862 | * Otherwise, search our list of hooks to see if we need to do something |
---|
863 | * special. |
---|
864 | * OSV: FIXME: this is hack. Using /dev/null filesystem entry would be |
---|
865 | * better. However, it's not clear how to handle root directory |
---|
866 | * other than '/' then. |
---|
867 | **********************************************************************/ |
---|
868 | if (null) |
---|
869 | { |
---|
870 | while ((n = read(s, buf, FTPD_DATASIZE)) > 0); |
---|
871 | } |
---|
872 | else if (rtems_ftpd_configuration.hooks != NULL) |
---|
873 | { |
---|
874 | struct rtems_ftpd_hook *hook; |
---|
875 | int i; |
---|
876 | |
---|
877 | i = 0; |
---|
878 | hook = &rtems_ftpd_configuration.hooks[i++]; |
---|
879 | while (hook->filename != NULL) |
---|
880 | { |
---|
881 | if (!strcmp(hook->filename, buf)) |
---|
882 | { |
---|
883 | usehook = hook; |
---|
884 | break; |
---|
885 | } |
---|
886 | hook = &rtems_ftpd_configuration.hooks[i++]; |
---|
887 | } |
---|
888 | } |
---|
889 | |
---|
890 | if (usehook != NULL) |
---|
891 | { |
---|
892 | /* |
---|
893 | * OSV: FIXME: Small buffer could be used and hook routine |
---|
894 | * called multiple times instead. Alternatively, the support could be |
---|
895 | * removed entirely in favor of configuring RTEMS pseudo-device with |
---|
896 | * given name. |
---|
897 | */ |
---|
898 | |
---|
899 | char *bigBufr; |
---|
900 | size_t filesize = rtems_ftpd_configuration.max_hook_filesize + 1; |
---|
901 | |
---|
902 | /*********************************************************************** |
---|
903 | * Allocate space for our "file". |
---|
904 | **********************************************************************/ |
---|
905 | bigBufr = (char *)malloc(filesize); |
---|
906 | if (bigBufr == NULL) |
---|
907 | { |
---|
908 | send_reply(info, 440, "Server error - malloc fail."); |
---|
909 | return(1); |
---|
910 | } |
---|
911 | |
---|
912 | /*********************************************************************** |
---|
913 | * Retrieve the file into our buffer space. |
---|
914 | **********************************************************************/ |
---|
915 | size = 0; |
---|
916 | while ((n = read(s, bigBufr + size, filesize - size)) > 0) |
---|
917 | { |
---|
918 | size += n; |
---|
919 | } |
---|
920 | if (size >= filesize) |
---|
921 | { |
---|
922 | send_reply(info, 440, "Server error - Buffer size exceeded."); |
---|
923 | free(bigBufr); |
---|
924 | close_socket(s); |
---|
925 | return(1); |
---|
926 | } |
---|
927 | close_socket(s); |
---|
928 | |
---|
929 | /*********************************************************************** |
---|
930 | * Call our hook. |
---|
931 | **********************************************************************/ |
---|
932 | if ((usehook->hook_function)(bigBufr, size) == 0) |
---|
933 | { |
---|
934 | send_reply(info, 210, "File transferred successfully."); |
---|
935 | } |
---|
936 | else |
---|
937 | { |
---|
938 | send_reply(info, 440, "File transfer failed."); |
---|
939 | } |
---|
940 | free(bigBufr); |
---|
941 | } |
---|
942 | else |
---|
943 | { |
---|
944 | int fd = |
---|
945 | creat(buf, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); |
---|
946 | |
---|
947 | if (0 > fd) |
---|
948 | { |
---|
949 | send_reply(info, 450, "Error creating file."); |
---|
950 | close_socket(s); |
---|
951 | return(0); |
---|
952 | } |
---|
953 | |
---|
954 | while ((n = read(s, buf, FTPD_DATASIZE)) > 0) |
---|
955 | { |
---|
956 | if (0 > write(fd, buf, n)) |
---|
957 | { |
---|
958 | send_reply(info, 450, "Error during write."); |
---|
959 | close(fd); |
---|
960 | close_socket(s); |
---|
961 | return(1); |
---|
962 | } |
---|
963 | } |
---|
964 | if (0 > close(fd)) |
---|
965 | { |
---|
966 | send_reply(info, 450, "Error during write."); |
---|
967 | close_socket(s); |
---|
968 | return(1); |
---|
969 | } |
---|
970 | close_socket(s); |
---|
971 | send_reply(info, 226, "Transfer complete."); |
---|
972 | } |
---|
973 | |
---|
974 | return(0); |
---|
975 | } |
---|
976 | |
---|
977 | |
---|
978 | /*PAGE |
---|
979 | * |
---|
980 | * send_dirline |
---|
981 | * |
---|
982 | * Sends one line of LIST command reply corresponding to single file. |
---|
983 | * |
---|
984 | * Input parameters: |
---|
985 | * s - socket descriptor to send data to |
---|
986 | * wide - if 0, send only file name. If not 0, send 'stat' info as well in |
---|
987 | * "ls -l" format. |
---|
988 | * curTime - current time |
---|
989 | * path - path to be prepended to what is given by 'add' |
---|
990 | * add - path to be appended to what is given by 'path', the resulting path |
---|
991 | * is then passed to 'stat()' routine |
---|
992 | * name - file name to be reported in output |
---|
993 | * buf - buffer for temporary data |
---|
994 | * |
---|
995 | * Output parameters: |
---|
996 | * NONE |
---|
997 | * |
---|
998 | */ |
---|
999 | static void |
---|
1000 | send_dirline(int s, int wide, time_t curTime, char const* path, |
---|
1001 | char const* add, char const* fname, char* buf) |
---|
1002 | { |
---|
1003 | if(wide) |
---|
1004 | { |
---|
1005 | struct stat stat_buf; |
---|
1006 | |
---|
1007 | int plen = strlen(path); |
---|
1008 | int alen = strlen(add); |
---|
1009 | if(plen == 0) |
---|
1010 | { |
---|
1011 | buf[plen++] = '/'; |
---|
1012 | buf[plen] = '\0'; |
---|
1013 | } |
---|
1014 | else |
---|
1015 | { |
---|
1016 | strcpy(buf, path); |
---|
1017 | if(alen > 0 && buf[plen - 1] != '/') |
---|
1018 | { |
---|
1019 | buf[plen++] = '/'; |
---|
1020 | if(plen >= FTPD_BUFSIZE) |
---|
1021 | return; |
---|
1022 | buf[plen] = '\0'; |
---|
1023 | } |
---|
1024 | } |
---|
1025 | if(plen + alen >= FTPD_BUFSIZE) |
---|
1026 | return; |
---|
1027 | strcpy(buf + plen, add); |
---|
1028 | |
---|
1029 | if (stat(buf, &stat_buf) == 0) |
---|
1030 | { |
---|
1031 | int len; |
---|
1032 | struct tm bt; |
---|
1033 | time_t tf = stat_buf.st_mtime; |
---|
1034 | enum { SIZE = 80 }; |
---|
1035 | enum { SIX_MONTHS = 365*24*60*60/2 }; |
---|
1036 | char timeBuf[SIZE]; |
---|
1037 | gmtime_r(&tf, &bt); |
---|
1038 | if(curTime > tf + SIX_MONTHS || tf > curTime + SIX_MONTHS) |
---|
1039 | strftime (timeBuf, SIZE, "%b %d %Y", &bt); |
---|
1040 | else |
---|
1041 | strftime (timeBuf, SIZE, "%b %d %H:%M", &bt); |
---|
1042 | |
---|
1043 | len = snprintf(buf, FTPD_BUFSIZE, |
---|
1044 | "%c%c%c%c%c%c%c%c%c%c 1 %5d %5d %11u %s %s\r\n", |
---|
1045 | (S_ISLNK(stat_buf.st_mode)?('l'): |
---|
1046 | (S_ISDIR(stat_buf.st_mode)?('d'):('-'))), |
---|
1047 | (stat_buf.st_mode & S_IRUSR)?('r'):('-'), |
---|
1048 | (stat_buf.st_mode & S_IWUSR)?('w'):('-'), |
---|
1049 | (stat_buf.st_mode & S_IXUSR)?('x'):('-'), |
---|
1050 | (stat_buf.st_mode & S_IRGRP)?('r'):('-'), |
---|
1051 | (stat_buf.st_mode & S_IWGRP)?('w'):('-'), |
---|
1052 | (stat_buf.st_mode & S_IXGRP)?('x'):('-'), |
---|
1053 | (stat_buf.st_mode & S_IROTH)?('r'):('-'), |
---|
1054 | (stat_buf.st_mode & S_IWOTH)?('w'):('-'), |
---|
1055 | (stat_buf.st_mode & S_IXOTH)?('x'):('-'), |
---|
1056 | (int)stat_buf.st_uid, |
---|
1057 | (int)stat_buf.st_gid, |
---|
1058 | (int)stat_buf.st_size, |
---|
1059 | timeBuf, |
---|
1060 | fname |
---|
1061 | ); |
---|
1062 | |
---|
1063 | send(s, buf, len, 0); |
---|
1064 | } |
---|
1065 | } |
---|
1066 | else |
---|
1067 | { |
---|
1068 | int len = snprintf(buf, FTPD_BUFSIZE, "%s\r\n", fname); |
---|
1069 | send(s, buf, len, 0); |
---|
1070 | } |
---|
1071 | } |
---|
1072 | |
---|
1073 | /************************************************************************** |
---|
1074 | * Function: command_list * |
---|
1075 | ************************************************************************** |
---|
1076 | * Description: * |
---|
1077 | * * |
---|
1078 | * Sends a file list through a data connection. The data * |
---|
1079 | * connection must have already been opened with the "PORT" command. * |
---|
1080 | * * |
---|
1081 | * * |
---|
1082 | * Inputs: * |
---|
1083 | * * |
---|
1084 | * char *fname - File (or directory) to list. * |
---|
1085 | * * |
---|
1086 | * Output: * |
---|
1087 | * * |
---|
1088 | * none * |
---|
1089 | * * |
---|
1090 | *************************************************************************/ |
---|
1091 | static void |
---|
1092 | command_list(FTPD_SessionInfo_t *info, char const *fname, int wide) |
---|
1093 | { |
---|
1094 | int s; |
---|
1095 | DIR *dirp = 0; |
---|
1096 | struct dirent *dp = 0; |
---|
1097 | struct stat stat_buf; |
---|
1098 | char buf[FTPD_BUFSIZE]; |
---|
1099 | char path[FTPD_BUFSIZE]; |
---|
1100 | time_t curTime; |
---|
1101 | char const* res; |
---|
1102 | char const* cwd = info->cwd; |
---|
1103 | |
---|
1104 | send_reply(info, 150, "Opening ASCII mode data connection for LIST."); |
---|
1105 | |
---|
1106 | s = data_socket(info); |
---|
1107 | if(0 > s) |
---|
1108 | { |
---|
1109 | syslog(LOG_ERR, "ftpd: Error connecting to data socket."); |
---|
1110 | return; |
---|
1111 | } |
---|
1112 | |
---|
1113 | if(fname[0] == '\0') |
---|
1114 | fname = "."; |
---|
1115 | |
---|
1116 | res = make_path(path, cwd, fname); |
---|
1117 | |
---|
1118 | if (NULL == res || 0 > stat(path, &stat_buf)) |
---|
1119 | { |
---|
1120 | snprintf(buf, FTPD_BUFSIZE, |
---|
1121 | "%s: No such file or directory.\r\n", fname); |
---|
1122 | send(s, buf, strlen(buf), 0); |
---|
1123 | } |
---|
1124 | else if (S_ISDIR(stat_buf.st_mode) && (NULL == (dirp = opendir(path)))) |
---|
1125 | { |
---|
1126 | snprintf(buf, FTPD_BUFSIZE, |
---|
1127 | "%s: Can not open directory.\r\n", fname); |
---|
1128 | send(s, buf, strlen(buf), 0); |
---|
1129 | } |
---|
1130 | else |
---|
1131 | { |
---|
1132 | time(&curTime); |
---|
1133 | if(!dirp) |
---|
1134 | send_dirline(s, wide, curTime, path, "", fname, buf); |
---|
1135 | else { |
---|
1136 | /* FIXME: need "." and ".." only when '-a' option is given */ |
---|
1137 | send_dirline(s, wide, curTime, path, "", ".", buf); |
---|
1138 | if(!strcmp(path, root)) |
---|
1139 | send_dirline(s, wide, curTime, path, "", "..", buf); |
---|
1140 | else |
---|
1141 | send_dirline(s, wide, curTime, path, "..", "..", buf); |
---|
1142 | while ((dp = readdir(dirp)) != NULL) |
---|
1143 | send_dirline(s, wide, curTime, path, dp->d_name, dp->d_name, buf); |
---|
1144 | } |
---|
1145 | } |
---|
1146 | |
---|
1147 | if(dirp) |
---|
1148 | closedir(dirp); |
---|
1149 | close_socket(s); |
---|
1150 | send_reply(info, 226, "Transfer complete."); |
---|
1151 | } |
---|
1152 | |
---|
1153 | |
---|
1154 | /*PAGE |
---|
1155 | * |
---|
1156 | * rtems_ftpd_cwd |
---|
1157 | * |
---|
1158 | * Change current working directory. We use 'chdir' here only to validate the |
---|
1159 | * new directory. We keep track of current working directory ourselves because |
---|
1160 | * current working directory in RTEMS isn't thread local, but we need it to be |
---|
1161 | * session local. |
---|
1162 | * |
---|
1163 | * Input parameters: |
---|
1164 | * info - corresponding SessionInfo structure |
---|
1165 | * dir - directory name passed in CWD command |
---|
1166 | * |
---|
1167 | * Output parameters: |
---|
1168 | * info->cwd is set to new CWD value. |
---|
1169 | * |
---|
1170 | */ |
---|
1171 | static void |
---|
1172 | rtems_ftpd_cwd(FTPD_SessionInfo_t *info, char *dir) |
---|
1173 | { |
---|
1174 | char buf[FTPD_BUFSIZE]; |
---|
1175 | char const* cwd = make_path(buf, info->cwd, dir); |
---|
1176 | if(cwd && chdir(buf) == 0) |
---|
1177 | { |
---|
1178 | send_reply(info, 250, "CWD command successful."); |
---|
1179 | strcpy(info->cwd, cwd); |
---|
1180 | } |
---|
1181 | else |
---|
1182 | { |
---|
1183 | send_reply(info, 550, "CWD command failed."); |
---|
1184 | } |
---|
1185 | } |
---|
1186 | |
---|
1187 | |
---|
1188 | |
---|
1189 | /*PAGE |
---|
1190 | * |
---|
1191 | * command_mdtm |
---|
1192 | * |
---|
1193 | * Handle FTP MDTM command |
---|
1194 | * |
---|
1195 | * Input parameters: |
---|
1196 | * info - corresponding SessionInfo structure |
---|
1197 | * fname - file name passed in MDTM command |
---|
1198 | * |
---|
1199 | * Output parameters: |
---|
1200 | * info->cwd is set to new CWD value. |
---|
1201 | * |
---|
1202 | */ |
---|
1203 | static void |
---|
1204 | command_mdtm(FTPD_SessionInfo_t *info, char const* fname) |
---|
1205 | { |
---|
1206 | struct stat stbuf; |
---|
1207 | char buf[FTPD_BUFSIZE]; |
---|
1208 | |
---|
1209 | if(*fname == '\0') |
---|
1210 | fname = "."; |
---|
1211 | |
---|
1212 | if (stat(fname, &stbuf) < 0) |
---|
1213 | { |
---|
1214 | snprintf(buf, FTPD_BUFSIZE, "%s: %s.", fname, serr()); |
---|
1215 | send_reply(info, 550, buf); |
---|
1216 | } |
---|
1217 | else |
---|
1218 | { |
---|
1219 | struct tm *t = gmtime(&stbuf.st_mtime); |
---|
1220 | snprintf(buf, FTPD_BUFSIZE, "%04d%02d%02d%02d%02d%02d", |
---|
1221 | 1900 + t->tm_year, |
---|
1222 | t->tm_mon+1, t->tm_mday, |
---|
1223 | t->tm_hour, t->tm_min, t->tm_sec); |
---|
1224 | send_reply(info, 213, buf); |
---|
1225 | } |
---|
1226 | } |
---|
1227 | |
---|
1228 | /************************************************************************** |
---|
1229 | * Function: command_port * |
---|
1230 | ************************************************************************** |
---|
1231 | * Description: * |
---|
1232 | * * |
---|
1233 | * This procedure opens up a data port given the IP address of the * |
---|
1234 | * remote machine and the port on the remote machine. This connection * |
---|
1235 | * will then be used to transfer data between the hosts. * |
---|
1236 | * * |
---|
1237 | * * |
---|
1238 | * Inputs: * |
---|
1239 | * * |
---|
1240 | * char *bufr - Arguments to the "PORT" command. * |
---|
1241 | * * |
---|
1242 | * * |
---|
1243 | * Output: * |
---|
1244 | * * |
---|
1245 | * none * |
---|
1246 | * * |
---|
1247 | *************************************************************************/ |
---|
1248 | static void |
---|
1249 | command_port(FTPD_SessionInfo_t *info, char *bufr) |
---|
1250 | { |
---|
1251 | char *ip; |
---|
1252 | char *port; |
---|
1253 | int ip0, ip1, ip2, ip3, port0, port1; |
---|
1254 | |
---|
1255 | sscanf(bufr, "%d,%d,%d,%d,%d,%d", &ip0, &ip1, &ip2, &ip3, &port0, &port1); |
---|
1256 | ip = (char *)&(info->data_addr.sin_addr); |
---|
1257 | ip[0] = ip0 & 0xff; |
---|
1258 | ip[1] = ip1 & 0xff; |
---|
1259 | ip[2] = ip2 & 0xff; |
---|
1260 | ip[3] = ip3 & 0xff; |
---|
1261 | port = (char *)&(info->data_addr.sin_port); |
---|
1262 | port[0] = port0 & 0xff; |
---|
1263 | port[1] = port1 & 0xff; |
---|
1264 | info->data_addr.sin_family = AF_INET; |
---|
1265 | } |
---|
1266 | |
---|
1267 | |
---|
1268 | /*PAGE |
---|
1269 | * |
---|
1270 | * skip_options |
---|
1271 | * |
---|
1272 | * Utility routine to skip options (if any) from input command. |
---|
1273 | * |
---|
1274 | * Input parameters: |
---|
1275 | * p - pointer to pointer to command |
---|
1276 | * |
---|
1277 | * Output parameters: |
---|
1278 | * p - is changed to point to first non-option argument |
---|
1279 | * |
---|
1280 | */ |
---|
1281 | static void |
---|
1282 | skip_options(char **p) |
---|
1283 | { |
---|
1284 | char* buf = *p; |
---|
1285 | while(1) { |
---|
1286 | while(*buf == ' ') |
---|
1287 | ++buf; |
---|
1288 | if(*buf == '-') { |
---|
1289 | if(*++buf == '-') { /* `--' should terminate options */ |
---|
1290 | ++buf; |
---|
1291 | while(*buf == ' ') |
---|
1292 | ++buf; |
---|
1293 | break; |
---|
1294 | } |
---|
1295 | while(*buf != ' ' && *buf != '\0') |
---|
1296 | ++buf; |
---|
1297 | } |
---|
1298 | else |
---|
1299 | break; |
---|
1300 | } |
---|
1301 | *p = buf; |
---|
1302 | } |
---|
1303 | |
---|
1304 | /************************************************************************** |
---|
1305 | * Function: parse_command * |
---|
1306 | ************************************************************************** |
---|
1307 | * Description: * |
---|
1308 | * * |
---|
1309 | * Here, we parse the commands that have come through the control * |
---|
1310 | * connection. * |
---|
1311 | * * |
---|
1312 | * FIXME: This section is somewhat of a hack. We should have a better * |
---|
1313 | * way to parse commands. * |
---|
1314 | * * |
---|
1315 | * Inputs: * |
---|
1316 | * * |
---|
1317 | * char *bufr - Pointer to the buffer which contains the command * |
---|
1318 | * text. * |
---|
1319 | * * |
---|
1320 | * Output: * |
---|
1321 | * * |
---|
1322 | * none * |
---|
1323 | * * |
---|
1324 | *************************************************************************/ |
---|
1325 | static void |
---|
1326 | parse_command(FTPD_SessionInfo_t *info, char *bufr) |
---|
1327 | { |
---|
1328 | char fname[FTPD_BUFSIZE]; |
---|
1329 | |
---|
1330 | if (!strncmp("PORT", bufr, 4)) |
---|
1331 | { |
---|
1332 | send_reply(info, 200, "PORT command successful."); |
---|
1333 | command_port(info, &bufr[5]); |
---|
1334 | } |
---|
1335 | else if (!strncmp("RETR", bufr, 4)) |
---|
1336 | { |
---|
1337 | sscanf(&bufr[5], "%254s", fname); |
---|
1338 | command_retrieve(info, fname); |
---|
1339 | } |
---|
1340 | else if (!strncmp("STOR", bufr, 4)) |
---|
1341 | { |
---|
1342 | sscanf(&bufr[5], "%254s", fname); |
---|
1343 | command_store(info, fname); |
---|
1344 | } |
---|
1345 | else if (!strncmp("LIST", bufr, 4)) |
---|
1346 | { |
---|
1347 | bufr += 4; |
---|
1348 | skip_options(&bufr); |
---|
1349 | sscanf(bufr, "%254s", fname); |
---|
1350 | command_list(info, fname, 1); |
---|
1351 | } |
---|
1352 | else if (!strncmp("NLST", bufr, 4)) |
---|
1353 | { |
---|
1354 | bufr += 4; |
---|
1355 | skip_options(&bufr); |
---|
1356 | sscanf(bufr, "%254s", fname); |
---|
1357 | command_list(info, fname, 0); |
---|
1358 | } |
---|
1359 | else if (!strncmp("MDTM", bufr, 4)) |
---|
1360 | { |
---|
1361 | bufr += 4; |
---|
1362 | skip_options(&bufr); |
---|
1363 | sscanf(bufr, "%254s", fname); |
---|
1364 | command_mdtm(info, fname); |
---|
1365 | } |
---|
1366 | else if (!strncmp("USER", bufr, 4)) |
---|
1367 | { |
---|
1368 | send_reply(info, 230, "User logged in."); |
---|
1369 | } |
---|
1370 | else if (!strncmp("SYST", bufr, 4)) |
---|
1371 | { |
---|
1372 | send_reply(info, 240, FTPD_SYSTYPE); |
---|
1373 | } |
---|
1374 | else if (!strncmp("TYPE", bufr, 4)) |
---|
1375 | { |
---|
1376 | if (bufr[5] == 'I') |
---|
1377 | { |
---|
1378 | info->xfer_mode = TYPE_I; |
---|
1379 | send_reply(info, 200, "Type set to I."); |
---|
1380 | } |
---|
1381 | else if (bufr[5] == 'A') |
---|
1382 | { |
---|
1383 | /* FIXME: ASCII mode isn't actually supported yet. */ |
---|
1384 | info->xfer_mode = TYPE_A; |
---|
1385 | send_reply(info, 200, "Type set to A."); |
---|
1386 | } |
---|
1387 | else |
---|
1388 | { |
---|
1389 | info->xfer_mode = TYPE_I; |
---|
1390 | send_reply(info, 504, "Type not implemented. Set to I."); |
---|
1391 | } |
---|
1392 | } |
---|
1393 | else if (!strncmp("PASS", bufr, 4)) |
---|
1394 | { |
---|
1395 | send_reply(info, 230, "User logged in."); |
---|
1396 | } |
---|
1397 | else if (!strncmp("DELE", bufr, 4)) |
---|
1398 | { |
---|
1399 | sscanf(&bufr[4], "%254s", fname); |
---|
1400 | if (unlink(fname) == 0) |
---|
1401 | { |
---|
1402 | send_reply(info, 257, "DELE successful."); |
---|
1403 | } |
---|
1404 | else |
---|
1405 | { |
---|
1406 | send_reply(info, 550, "DELE failed."); |
---|
1407 | } |
---|
1408 | } |
---|
1409 | else if (!strncmp("SITE CHMOD", bufr, 10)) |
---|
1410 | { |
---|
1411 | int mask; |
---|
1412 | |
---|
1413 | sscanf(&bufr[11], "%o %254s", &mask, fname); |
---|
1414 | if (chmod(fname, (mode_t)mask) == 0) |
---|
1415 | { |
---|
1416 | send_reply(info, 257, "CHMOD successful."); |
---|
1417 | } |
---|
1418 | else |
---|
1419 | { |
---|
1420 | send_reply(info, 550, "CHMOD failed."); |
---|
1421 | } |
---|
1422 | } |
---|
1423 | else if (!strncmp("RMD", bufr, 3)) |
---|
1424 | { |
---|
1425 | sscanf(&bufr[4], "%254s", fname); |
---|
1426 | if (rmdir(fname) == 0) |
---|
1427 | { |
---|
1428 | send_reply(info, 257, "RMD successful."); |
---|
1429 | } |
---|
1430 | else |
---|
1431 | { |
---|
1432 | send_reply(info, 550, "RMD failed."); |
---|
1433 | } |
---|
1434 | } |
---|
1435 | else if (!strncmp("MKD", bufr, 3)) |
---|
1436 | { |
---|
1437 | sscanf(&bufr[4], "%254s", fname); |
---|
1438 | if (mkdir(fname, S_IRWXU | S_IRWXG | S_IRWXO) == 0) |
---|
1439 | { |
---|
1440 | send_reply(info, 257, "MKD successful."); |
---|
1441 | } |
---|
1442 | else |
---|
1443 | { |
---|
1444 | send_reply(info, 550, "MKD failed."); |
---|
1445 | } |
---|
1446 | } |
---|
1447 | else if (!strncmp("CWD", bufr, 3)) |
---|
1448 | { |
---|
1449 | sscanf(&bufr[4], "%254s", fname); |
---|
1450 | rtems_ftpd_cwd(info, fname); |
---|
1451 | } |
---|
1452 | else if (!strncmp("CDUP", bufr, 4)) |
---|
1453 | { |
---|
1454 | rtems_ftpd_cwd(info, ".."); |
---|
1455 | } |
---|
1456 | else if (!strncmp("PWD", bufr, 3)) |
---|
1457 | { |
---|
1458 | char const* cwd = "/"; |
---|
1459 | if(info->cwd[0]) |
---|
1460 | cwd = info->cwd; |
---|
1461 | snprintf(bufr, FTPD_BUFSIZE, |
---|
1462 | "\"%s\" is the current directory.", cwd); |
---|
1463 | send_reply(info, 250, bufr); |
---|
1464 | } |
---|
1465 | else |
---|
1466 | { |
---|
1467 | send_reply(info, 500, "Unrecognized/unsupported command."); |
---|
1468 | } |
---|
1469 | } |
---|
1470 | |
---|
1471 | |
---|
1472 | /************************************************************************** |
---|
1473 | * Function: session * |
---|
1474 | ************************************************************************** |
---|
1475 | * Description: * |
---|
1476 | * * |
---|
1477 | * This task is started when the FTP daemon gets a service request * |
---|
1478 | * from a remote machine. Here, we watch for commands that will * |
---|
1479 | * come through the "control" connection. These commands are then * |
---|
1480 | * parsed and executed until the connection is closed, either * |
---|
1481 | * unintentionally or intentionally with the "QUIT" command. * |
---|
1482 | * * |
---|
1483 | * * |
---|
1484 | * Inputs: * |
---|
1485 | * * |
---|
1486 | * rtems_task_argument arg - The daemon task passes the socket * |
---|
1487 | * which serves as the control connection. * |
---|
1488 | * * |
---|
1489 | * Output: * |
---|
1490 | * * |
---|
1491 | * none * |
---|
1492 | * * |
---|
1493 | *************************************************************************/ |
---|
1494 | static void |
---|
1495 | session(rtems_task_argument arg) |
---|
1496 | { |
---|
1497 | char cmd[FTPD_BUFSIZE]; |
---|
1498 | FTPD_SessionInfo_t *info = (FTPD_SessionInfo_t *)arg; |
---|
1499 | rtems_event_set set; |
---|
1500 | |
---|
1501 | while(1) { |
---|
1502 | rtems_event_receive(FTPD_RTEMS_EVENT, RTEMS_EVENT_ANY, RTEMS_NO_TIMEOUT, |
---|
1503 | &set); |
---|
1504 | |
---|
1505 | send_reply(info, 220, FTPD_SERVER_MESSAGE); |
---|
1506 | |
---|
1507 | info->cwd[0] = 0; |
---|
1508 | info->xfer_mode = TYPE_I; |
---|
1509 | |
---|
1510 | while (1) |
---|
1511 | { |
---|
1512 | if (fgets(cmd, FTPD_BUFSIZE, info->ctrl_fp) == NULL) |
---|
1513 | { |
---|
1514 | syslog(LOG_INFO, "ftpd: Connection aborted."); |
---|
1515 | break; |
---|
1516 | } |
---|
1517 | |
---|
1518 | if (!strncmp("QUIT", cmd, 4)) |
---|
1519 | { |
---|
1520 | send_reply(info, 221, "Goodbye."); |
---|
1521 | break; |
---|
1522 | } |
---|
1523 | else |
---|
1524 | { |
---|
1525 | parse_command(info, cmd); |
---|
1526 | } |
---|
1527 | } |
---|
1528 | |
---|
1529 | /* Close connection and put ourselves back into the task pool. */ |
---|
1530 | close_stream(info); |
---|
1531 | task_pool_release(info); |
---|
1532 | } |
---|
1533 | } |
---|
1534 | |
---|
1535 | |
---|
1536 | /************************************************************************** |
---|
1537 | * Function: daemon * |
---|
1538 | ************************************************************************** |
---|
1539 | * Description: * |
---|
1540 | * * |
---|
1541 | * This task runs in the background forever. It waits for service * |
---|
1542 | * requests on the FTP port (port 21). When a request is received, * |
---|
1543 | * it opens a new session to handle those requests until the * |
---|
1544 | * connection is closed. * |
---|
1545 | * * |
---|
1546 | * * |
---|
1547 | * Inputs: * |
---|
1548 | * * |
---|
1549 | * none * |
---|
1550 | * * |
---|
1551 | * Output: * |
---|
1552 | * * |
---|
1553 | * none * |
---|
1554 | * * |
---|
1555 | *************************************************************************/ |
---|
1556 | static void |
---|
1557 | daemon() |
---|
1558 | { |
---|
1559 | int s; |
---|
1560 | int addrLen; |
---|
1561 | struct sockaddr_in remoteAddr; |
---|
1562 | struct sockaddr_in localAddr; |
---|
1563 | char sessionID; |
---|
1564 | FTPD_SessionInfo_t *info = NULL; |
---|
1565 | |
---|
1566 | |
---|
1567 | sessionID = 'a'; |
---|
1568 | |
---|
1569 | s = socket(PF_INET, SOCK_STREAM, 0); |
---|
1570 | if (s < 0) |
---|
1571 | syslog(LOG_ERR, "ftpd: Error creating socket: %s", serr()); |
---|
1572 | |
---|
1573 | localAddr.sin_family = AF_INET; |
---|
1574 | localAddr.sin_port = htons(rtems_ftpd_configuration.port); |
---|
1575 | localAddr.sin_addr.s_addr = htonl(INADDR_ANY); |
---|
1576 | memset(localAddr.sin_zero, '\0', sizeof(localAddr.sin_zero)); |
---|
1577 | |
---|
1578 | if (0 > bind(s, (struct sockaddr *)&localAddr, sizeof(localAddr))) |
---|
1579 | syslog(LOG_ERR, "ftpd: Error binding control socket: %s", serr()); |
---|
1580 | |
---|
1581 | if (0 > listen(s, 1)) |
---|
1582 | syslog(LOG_ERR, "ftpd: Error listening on control socket: %s", serr()); |
---|
1583 | |
---|
1584 | while (1) |
---|
1585 | { |
---|
1586 | int ss; |
---|
1587 | addrLen = sizeof(remoteAddr); |
---|
1588 | ss = accept(s, (struct sockaddr *)&remoteAddr, &addrLen); |
---|
1589 | if (0 > ss) |
---|
1590 | { |
---|
1591 | syslog(LOG_ERR, "ftpd: Error accepting control connection: %s", serr()); |
---|
1592 | } |
---|
1593 | else |
---|
1594 | { |
---|
1595 | info = task_pool_obtain(); |
---|
1596 | if (NULL == info) |
---|
1597 | { |
---|
1598 | close_socket(ss); |
---|
1599 | } |
---|
1600 | else |
---|
1601 | { |
---|
1602 | info->socket = ss; |
---|
1603 | if ((info->ctrl_fp = fdopen(info->socket, "r+")) == NULL) |
---|
1604 | { |
---|
1605 | syslog(LOG_ERR, "ftpd: fdopen() on socket failed: %s", serr()); |
---|
1606 | close_stream(info); |
---|
1607 | task_pool_release(info); |
---|
1608 | } |
---|
1609 | else |
---|
1610 | { |
---|
1611 | /* Wakeup the session task. The task will call task_pool_release |
---|
1612 | after it closes connection. */ |
---|
1613 | rtems_event_send(info->tid, FTPD_RTEMS_EVENT); |
---|
1614 | } |
---|
1615 | } |
---|
1616 | } |
---|
1617 | } |
---|
1618 | } |
---|
1619 | |
---|
1620 | |
---|
1621 | /************************************************************************** |
---|
1622 | * Function: rtems_ftpd_start * |
---|
1623 | ************************************************************************** |
---|
1624 | * Description: * |
---|
1625 | * * |
---|
1626 | * Here, we start the FTPD task which waits for FTP requests and * |
---|
1627 | * services them. This procedure returns to its caller once the * |
---|
1628 | * task is started. * |
---|
1629 | * * |
---|
1630 | * * |
---|
1631 | * Inputs: * |
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1632 | * * |
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1633 | * Output: * |
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1634 | * * |
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1635 | * int - RTEMS_SUCCESSFUL on successful start of the daemon. * |
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1636 | * * |
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1637 | *************************************************************************/ |
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1638 | int |
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1639 | rtems_initialize_ftpd() |
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1640 | { |
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1641 | rtems_status_code sc; |
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1642 | rtems_id tid; |
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1643 | rtems_task_priority priority; |
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1644 | int count; |
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1645 | |
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1646 | if (rtems_ftpd_configuration.port == 0) |
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1647 | { |
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1648 | rtems_ftpd_configuration.port = FTPD_CONTROL_PORT; |
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1649 | } |
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1650 | |
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1651 | if (rtems_ftpd_configuration.priority == 0) |
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1652 | { |
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1653 | rtems_ftpd_configuration.priority = 40; |
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1654 | } |
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1655 | priority = rtems_ftpd_configuration.priority; |
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1656 | |
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1657 | if (rtems_ftpd_configuration.tasks_count <= 0) |
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1658 | rtems_ftpd_configuration.tasks_count = 1; |
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1659 | count = rtems_ftpd_configuration.tasks_count; |
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1660 | |
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1661 | if (!task_pool_init(count, priority)) |
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1662 | { |
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1663 | syslog(LOG_ERR, "ftpd: Could not initialize task pool."); |
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1664 | return RTEMS_UNSATISFIED; |
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1665 | } |
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1666 | |
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1667 | sc = rtems_task_create(rtems_build_name('F', 'T', 'P', 'D'), |
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1668 | priority, FTPD_STACKSIZE, |
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1669 | RTEMS_PREEMPT | RTEMS_NO_TIMESLICE | RTEMS_NO_ASR | |
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1670 | RTEMS_INTERRUPT_LEVEL(0), |
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1671 | RTEMS_NO_FLOATING_POINT | RTEMS_LOCAL, |
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1672 | &tid); |
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1673 | |
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1674 | if (sc == RTEMS_SUCCESSFUL) |
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1675 | { |
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1676 | sc = rtems_task_start(tid, daemon, 0); |
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1677 | if (sc != RTEMS_SUCCESSFUL) |
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1678 | rtems_task_delete(tid); |
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1679 | } |
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1680 | |
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1681 | if (sc != RTEMS_SUCCESSFUL) |
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1682 | { |
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1683 | task_pool_done(count); |
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1684 | syslog(LOG_ERR, "ftpd: Could not create/start FTP daemon: %s", |
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1685 | rtems_status_text(sc)); |
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1686 | return RTEMS_UNSATISFIED; |
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1687 | } |
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1688 | |
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1689 | root[0] = '\0'; |
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1690 | if ( |
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1691 | rtems_ftpd_configuration.root && |
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1692 | strlen(rtems_ftpd_configuration.root) < FTPD_BUFSIZE && |
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1693 | rtems_ftpd_configuration.root[0] == '/') |
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1694 | { |
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1695 | strcpy(root, rtems_ftpd_configuration.root); |
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1696 | squeeze_path(root); |
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1697 | rtems_ftpd_configuration.root = root; |
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1698 | } |
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1699 | |
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1700 | syslog(LOG_INFO, "ftpd: FTP daemon started (%d session%s max)", |
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1701 | count, ((count > 1) ? "s" : "")); |
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1702 | return RTEMS_SUCCESSFUL; |
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1703 | } |
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