1 | /* |
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2 | * vim: set expandtab tabstop=4 shiftwidth=4 ai : |
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3 | * |
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4 | * Trivial File Transfer Protocol (RFC 1350) |
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5 | * |
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6 | * Transfer file to/from remote host |
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7 | * |
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8 | * W. Eric Norum |
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9 | * Saskatchewan Accelerator Laboratory |
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10 | * University of Saskatchewan |
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11 | * Saskatoon, Saskatchewan, CANADA |
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12 | * eric@skatter.usask.ca |
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13 | * |
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14 | * $Id$ |
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15 | * |
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16 | */ |
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17 | |
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18 | #include <stdio.h> |
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19 | #include <stdlib.h> |
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20 | #include <errno.h> |
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21 | #include <malloc.h> |
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22 | #include <string.h> |
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23 | #include <unistd.h> |
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24 | #include <fcntl.h> |
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25 | #include <rtems.h> |
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26 | #include <rtems/libio.h> |
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27 | #include <rtems/libio_.h> |
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28 | #include <rtems/seterr.h> |
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29 | #include <rtems/rtems_bsdnet.h> |
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30 | #include <sys/types.h> |
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31 | #include <sys/socket.h> |
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32 | #include <netinet/in.h> |
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33 | #include <arpa/inet.h> |
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34 | |
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35 | #ifdef RTEMS_TFTP_DRIVER_DEBUG |
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36 | int rtems_tftp_driver_debug = 1; |
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37 | #endif |
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38 | |
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39 | /* |
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40 | * Range of UDP ports to try |
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41 | */ |
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42 | #define UDP_PORT_BASE 3180 |
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43 | |
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44 | /* |
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45 | * Pathname prefix |
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46 | */ |
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47 | #define TFTP_PATHNAME_PREFIX "/TFTP/" |
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48 | |
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49 | /* |
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50 | * Root node_access value |
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51 | * By using the address of a local static variable |
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52 | * we ensure a unique value for this identifier. |
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53 | */ |
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54 | #define ROOT_NODE_ACCESS (&tftp_mutex) |
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55 | |
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56 | /* |
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57 | * Default limits |
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58 | */ |
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59 | #define PACKET_FIRST_TIMEOUT_MILLISECONDS 400L |
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60 | #define PACKET_TIMEOUT_MILLISECONDS 6000L |
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61 | #define OPEN_RETRY_LIMIT 10 |
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62 | #define IO_RETRY_LIMIT 10 |
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63 | |
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64 | /* |
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65 | * TFTP opcodes |
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66 | */ |
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67 | #define TFTP_OPCODE_RRQ 1 |
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68 | #define TFTP_OPCODE_WRQ 2 |
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69 | #define TFTP_OPCODE_DATA 3 |
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70 | #define TFTP_OPCODE_ACK 4 |
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71 | #define TFTP_OPCODE_ERROR 5 |
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72 | |
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73 | /* |
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74 | * Largest data transfer |
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75 | */ |
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76 | #define TFTP_BUFSIZE 512 |
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77 | |
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78 | /* |
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79 | * Packets transferred between machines |
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80 | */ |
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81 | union tftpPacket { |
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82 | /* |
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83 | * RRQ/WRQ packet |
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84 | */ |
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85 | struct tftpRWRQ { |
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86 | uint16_t opcode; |
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87 | char filename_mode[TFTP_BUFSIZE]; |
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88 | } tftpRWRQ; |
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89 | |
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90 | /* |
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91 | * DATA packet |
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92 | */ |
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93 | struct tftpDATA { |
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94 | uint16_t opcode; |
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95 | uint16_t blocknum; |
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96 | uint8_t data[TFTP_BUFSIZE]; |
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97 | } tftpDATA; |
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98 | |
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99 | /* |
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100 | * ACK packet |
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101 | */ |
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102 | struct tftpACK { |
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103 | uint16_t opcode; |
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104 | uint16_t blocknum; |
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105 | } tftpACK; |
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106 | |
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107 | /* |
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108 | * ERROR packet |
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109 | */ |
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110 | struct tftpERROR { |
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111 | uint16_t opcode; |
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112 | uint16_t errorCode; |
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113 | char errorMessage[TFTP_BUFSIZE]; |
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114 | } tftpERROR; |
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115 | }; |
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116 | |
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117 | /* |
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118 | * State of each TFTP stream |
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119 | */ |
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120 | struct tftpStream { |
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121 | /* |
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122 | * Buffer for storing most recently-received packet |
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123 | */ |
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124 | union tftpPacket pkbuf; |
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125 | |
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126 | /* |
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127 | * Last block number transferred |
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128 | */ |
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129 | uint16_t blocknum; |
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130 | |
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131 | /* |
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132 | * Data transfer socket |
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133 | */ |
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134 | int socket; |
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135 | struct sockaddr_in myAddress; |
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136 | struct sockaddr_in farAddress; |
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137 | |
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138 | /* |
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139 | * Indices into buffer |
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140 | */ |
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141 | int nleft; |
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142 | int nused; |
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143 | |
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144 | /* |
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145 | * Flags |
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146 | */ |
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147 | int firstReply; |
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148 | int eof; |
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149 | int writing; |
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150 | }; |
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151 | |
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152 | /* |
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153 | * Number of streams open at the same time |
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154 | */ |
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155 | static rtems_id tftp_mutex; |
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156 | static int nStreams; |
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157 | static struct tftpStream ** volatile tftpStreams; |
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158 | |
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159 | typedef const char *tftp_node; |
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160 | extern rtems_filesystem_operations_table rtems_tftp_ops; |
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161 | extern rtems_filesystem_file_handlers_r rtems_tftp_handlers; |
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162 | |
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163 | /* |
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164 | * Direct copy from the IMFS. Look at this. |
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165 | */ |
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166 | |
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167 | rtems_filesystem_limits_and_options_t rtems_tftp_limits_and_options = { |
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168 | 5, /* link_max */ |
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169 | 6, /* max_canon */ |
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170 | 7, /* max_input */ |
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171 | 255, /* name_max */ |
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172 | 255, /* path_max */ |
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173 | 2, /* pipe_buf */ |
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174 | 1, /* posix_async_io */ |
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175 | 2, /* posix_chown_restrictions */ |
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176 | 3, /* posix_no_trunc */ |
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177 | 4, /* posix_prio_io */ |
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178 | 5, /* posix_sync_io */ |
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179 | 6 /* posix_vdisable */ |
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180 | }; |
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181 | |
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182 | static int rtems_tftp_mount_me( |
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183 | rtems_filesystem_mount_table_entry_t *temp_mt_entry |
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184 | ) |
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185 | { |
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186 | rtems_status_code sc; |
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187 | |
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188 | temp_mt_entry->mt_fs_root.handlers = &rtems_tftp_handlers; |
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189 | temp_mt_entry->mt_fs_root.ops = &rtems_tftp_ops; |
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190 | |
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191 | /* |
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192 | * We have no tftp filesystem specific data to maintain. This |
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193 | * filesystem may only be mounted ONCE. |
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194 | * |
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195 | * And we maintain no real filesystem nodes, so there is no real root. |
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196 | */ |
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197 | |
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198 | temp_mt_entry->fs_info = NULL; |
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199 | temp_mt_entry->mt_fs_root.node_access = ROOT_NODE_ACCESS; |
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200 | |
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201 | /* |
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202 | * These need to be looked at for full POSIX semantics. |
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203 | */ |
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204 | |
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205 | temp_mt_entry->pathconf_limits_and_options = rtems_tftp_limits_and_options; |
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206 | |
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207 | |
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208 | /* |
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209 | * Now allocate a semaphore for mutual exclusion. |
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210 | * |
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211 | * NOTE: This could be in an fsinfo for this filesystem type. |
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212 | */ |
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213 | |
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214 | sc = rtems_semaphore_create ( |
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215 | rtems_build_name('T', 'F', 'T', 'P'), |
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216 | 1, |
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217 | RTEMS_FIFO | |
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218 | RTEMS_BINARY_SEMAPHORE | |
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219 | RTEMS_NO_INHERIT_PRIORITY | |
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220 | RTEMS_NO_PRIORITY_CEILING | |
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221 | RTEMS_LOCAL, |
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222 | 0, |
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223 | &tftp_mutex |
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224 | ); |
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225 | |
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226 | if (sc != RTEMS_SUCCESSFUL) |
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227 | rtems_set_errno_and_return_minus_one( ENOMEM ); |
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228 | |
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229 | return 0; |
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230 | } |
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231 | |
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232 | /* |
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233 | * Initialize the TFTP driver |
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234 | */ |
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235 | |
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236 | int rtems_bsdnet_initialize_tftp_filesystem () |
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237 | { |
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238 | int status; |
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239 | rtems_filesystem_mount_table_entry_t *entry; |
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240 | |
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241 | status = mkdir( TFTP_PATHNAME_PREFIX, S_IRWXU | S_IRWXG | S_IRWXO ); |
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242 | if ( status == -1 ) |
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243 | return status; |
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244 | |
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245 | status = mount( |
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246 | &entry, |
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247 | &rtems_tftp_ops, |
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248 | RTEMS_FILESYSTEM_READ_WRITE, |
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249 | NULL, |
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250 | TFTP_PATHNAME_PREFIX |
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251 | ); |
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252 | |
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253 | if ( status ) |
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254 | perror( "TFTP mount failed" ); |
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255 | |
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256 | return status; |
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257 | } |
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258 | |
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259 | /* |
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260 | * Map error message |
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261 | */ |
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262 | static int |
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263 | tftpErrno (struct tftpStream *tp) |
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264 | { |
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265 | unsigned int tftpError; |
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266 | static const int errorMap[] = { |
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267 | EINVAL, |
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268 | ENOENT, |
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269 | EPERM, |
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270 | ENOSPC, |
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271 | EINVAL, |
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272 | ENXIO, |
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273 | EEXIST, |
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274 | ESRCH, |
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275 | }; |
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276 | |
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277 | tftpError = ntohs (tp->pkbuf.tftpERROR.errorCode); |
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278 | if (tftpError < (sizeof errorMap / sizeof errorMap[0])) |
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279 | return errorMap[tftpError]; |
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280 | else |
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281 | return 1000 + tftpError; |
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282 | } |
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283 | |
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284 | /* |
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285 | * Send a message to make the other end shut up |
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286 | */ |
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287 | static void |
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288 | sendStifle (struct tftpStream *tp, struct sockaddr_in *to) |
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289 | { |
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290 | int len; |
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291 | struct { |
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292 | uint16_t opcode; |
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293 | uint16_t errorCode; |
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294 | char errorMessage[12]; |
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295 | } msg; |
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296 | |
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297 | /* |
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298 | * Create the error packet (Unknown transfer ID). |
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299 | */ |
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300 | msg.opcode = htons (TFTP_OPCODE_ERROR); |
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301 | msg.errorCode = htons (5); |
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302 | len = sizeof msg.opcode + sizeof msg.errorCode + 1; |
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303 | len += sprintf (msg.errorMessage, "GO AWAY"); |
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304 | |
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305 | /* |
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306 | * Send it |
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307 | */ |
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308 | sendto (tp->socket, (char *)&msg, len, 0, (struct sockaddr *)to, sizeof *to); |
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309 | } |
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310 | |
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311 | /* |
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312 | * Wait for a data packet |
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313 | */ |
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314 | static int |
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315 | getPacket (struct tftpStream *tp, int retryCount) |
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316 | { |
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317 | int len; |
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318 | struct timeval tv; |
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319 | |
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320 | if (retryCount == 0) { |
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321 | tv.tv_sec = PACKET_FIRST_TIMEOUT_MILLISECONDS / 1000L; |
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322 | tv.tv_usec = (PACKET_FIRST_TIMEOUT_MILLISECONDS % 1000L) * 1000L; |
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323 | } |
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324 | else { |
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325 | tv.tv_sec = PACKET_TIMEOUT_MILLISECONDS / 1000L; |
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326 | tv.tv_usec = (PACKET_TIMEOUT_MILLISECONDS % 1000L) * 1000L; |
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327 | } |
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328 | setsockopt (tp->socket, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof tv); |
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329 | for (;;) { |
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330 | union { |
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331 | struct sockaddr s; |
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332 | struct sockaddr_in i; |
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333 | } from; |
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334 | socklen_t fromlen = sizeof from; |
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335 | len = recvfrom (tp->socket, &tp->pkbuf, |
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336 | sizeof tp->pkbuf, 0, |
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337 | &from.s, &fromlen); |
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338 | if (len < 0) |
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339 | break; |
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340 | if (from.i.sin_addr.s_addr == tp->farAddress.sin_addr.s_addr) { |
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341 | if (tp->firstReply) { |
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342 | tp->firstReply = 0; |
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343 | tp->farAddress.sin_port = from.i.sin_port; |
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344 | } |
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345 | if (tp->farAddress.sin_port == from.i.sin_port) |
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346 | break; |
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347 | } |
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348 | |
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349 | /* |
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350 | * Packet is from someone with whom we are |
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351 | * not interested. Tell them to go away. |
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352 | */ |
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353 | sendStifle (tp, &from.i); |
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354 | } |
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355 | tv.tv_sec = 0; |
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356 | tv.tv_usec = 0; |
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357 | setsockopt (tp->socket, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof tv); |
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358 | #ifdef RTEMS_TFTP_DRIVER_DEBUG |
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359 | if (rtems_tftp_driver_debug) { |
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360 | if (len >= (int) sizeof tp->pkbuf.tftpACK) { |
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361 | int opcode = ntohs (tp->pkbuf.tftpDATA.opcode); |
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362 | switch (opcode) { |
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363 | default: |
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364 | printf ("TFTP: OPCODE %d\n", opcode); |
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365 | break; |
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366 | |
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367 | case TFTP_OPCODE_DATA: |
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368 | printf ("TFTP: RECV %d\n", ntohs (tp->pkbuf.tftpDATA.blocknum)); |
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369 | break; |
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370 | |
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371 | case TFTP_OPCODE_ACK: |
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372 | printf ("TFTP: GOT ACK %d\n", ntohs (tp->pkbuf.tftpACK.blocknum)); |
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373 | break; |
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374 | } |
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375 | } |
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376 | else { |
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377 | printf ("TFTP: %d-byte packet\n", len); |
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378 | } |
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379 | } |
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380 | #endif |
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381 | return len; |
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382 | } |
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383 | |
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384 | /* |
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385 | * Send an acknowledgement |
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386 | */ |
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387 | static int |
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388 | sendAck (struct tftpStream *tp) |
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389 | { |
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390 | #ifdef RTEMS_TFTP_DRIVER_DEBUG |
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391 | if (rtems_tftp_driver_debug) |
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392 | printf ("TFTP: ACK %d\n", tp->blocknum); |
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393 | #endif |
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394 | |
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395 | /* |
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396 | * Create the acknowledgement |
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397 | */ |
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398 | tp->pkbuf.tftpACK.opcode = htons (TFTP_OPCODE_ACK); |
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399 | tp->pkbuf.tftpACK.blocknum = htons (tp->blocknum); |
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400 | |
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401 | /* |
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402 | * Send it |
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403 | */ |
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404 | if (sendto (tp->socket, (char *)&tp->pkbuf, sizeof tp->pkbuf.tftpACK, 0, |
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405 | (struct sockaddr *)&tp->farAddress, |
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406 | sizeof tp->farAddress) < 0) |
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407 | return errno; |
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408 | return 0; |
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409 | } |
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410 | |
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411 | /* |
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412 | * Release a stream and clear the pointer to it |
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413 | */ |
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414 | static void |
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415 | releaseStream (int s) |
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416 | { |
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417 | rtems_semaphore_obtain (tftp_mutex, RTEMS_WAIT, RTEMS_NO_TIMEOUT); |
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418 | free (tftpStreams[s]); |
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419 | tftpStreams[s] = NULL; |
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420 | rtems_semaphore_release (tftp_mutex); |
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421 | } |
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422 | |
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423 | static int rtems_tftp_evaluate_for_make( |
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424 | const char *path, /* IN */ |
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425 | rtems_filesystem_location_info_t *pathloc, /* IN/OUT */ |
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426 | const char **name /* OUT */ |
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427 | ) |
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428 | { |
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429 | pathloc->node_access = NULL; |
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430 | rtems_set_errno_and_return_minus_one( EIO ); |
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431 | } |
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432 | |
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433 | /* |
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434 | * Convert a path to canonical form |
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435 | */ |
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436 | static void |
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437 | fixPath (char *path) |
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438 | { |
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439 | char *inp, *outp, *base; |
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440 | |
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441 | outp = inp = path; |
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442 | base = NULL; |
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443 | for (;;) { |
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444 | if (inp[0] == '.') { |
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445 | if (inp[1] == '\0') |
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446 | break; |
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447 | if (inp[1] == '/') { |
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448 | inp += 2; |
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449 | continue; |
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450 | } |
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451 | if (inp[1] == '.') { |
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452 | if (inp[2] == '\0') { |
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453 | if ((base != NULL) && (outp > base)) { |
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454 | outp--; |
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455 | while ((outp > base) && (outp[-1] != '/')) |
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456 | outp--; |
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457 | } |
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458 | break; |
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459 | } |
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460 | if (inp[2] == '/') { |
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461 | inp += 3; |
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462 | if (base == NULL) |
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463 | continue; |
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464 | if (outp > base) { |
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465 | outp--; |
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466 | while ((outp > base) && (outp[-1] != '/')) |
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467 | outp--; |
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468 | } |
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469 | continue; |
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470 | } |
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471 | } |
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472 | } |
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473 | if (base == NULL) |
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474 | base = inp; |
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475 | while (inp[0] != '/') { |
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476 | if ((*outp++ = *inp++) == '\0') |
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477 | return; |
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478 | } |
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479 | *outp++ = '/'; |
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480 | while (inp[0] == '/') |
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481 | inp++; |
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482 | } |
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483 | *outp = '\0'; |
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484 | return; |
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485 | } |
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486 | |
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487 | static int rtems_tftp_eval_path( |
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488 | const char *pathname, /* IN */ |
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489 | int flags, /* IN */ |
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490 | rtems_filesystem_location_info_t *pathloc /* IN/OUT */ |
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491 | ) |
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492 | { |
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493 | pathloc->handlers = &rtems_tftp_handlers; |
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494 | |
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495 | /* |
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496 | * Hack to provide the illusion of directories inside the TFTP file system. |
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497 | * Paths ending in a / are assumed to be directories. |
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498 | */ |
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499 | if (pathname[strlen(pathname)-1] == '/') { |
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500 | int isRelative = (pathloc->node_access != ROOT_NODE_ACCESS); |
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501 | char *cp; |
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502 | |
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503 | /* |
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504 | * Reject attempts to open() directories |
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505 | */ |
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506 | if (flags & RTEMS_LIBIO_PERMS_RDWR) |
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507 | rtems_set_errno_and_return_minus_one( EISDIR ); |
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508 | if (isRelative) { |
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509 | cp = malloc (strlen(pathloc->node_access)+strlen(pathname)+1); |
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510 | if (cp == NULL) |
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511 | rtems_set_errno_and_return_minus_one( ENOMEM ); |
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512 | strcpy (cp, pathloc->node_access); |
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513 | strcat (cp, pathname); |
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514 | } |
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515 | else { |
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516 | cp = strdup (pathname); |
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517 | if (cp == NULL) |
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518 | rtems_set_errno_and_return_minus_one( ENOMEM ); |
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519 | } |
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520 | fixPath (cp); |
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521 | pathloc->node_access = cp; |
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522 | return 0; |
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523 | } |
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524 | if (pathloc->node_access != ROOT_NODE_ACCESS) |
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525 | pathloc->node_access = 0; |
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526 | |
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527 | /* |
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528 | * Reject it if it's not read-only or write-only. |
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529 | */ |
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530 | flags &= RTEMS_LIBIO_PERMS_READ | RTEMS_LIBIO_PERMS_WRITE; |
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531 | if ((flags != RTEMS_LIBIO_PERMS_READ) && (flags != RTEMS_LIBIO_PERMS_WRITE) ) |
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532 | rtems_set_errno_and_return_minus_one( EINVAL ); |
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533 | return 0; |
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534 | } |
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535 | |
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536 | /* |
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537 | * The routine which does most of the work for the IMFS open handler |
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538 | */ |
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539 | static int rtems_tftp_open_worker( |
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540 | rtems_libio_t *iop, |
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541 | char *full_path_name, |
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542 | uint32_t flags, |
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543 | uint32_t mode |
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544 | ) |
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545 | { |
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546 | struct tftpStream *tp; |
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547 | int retryCount; |
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548 | struct in_addr farAddress; |
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549 | int s; |
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550 | int len; |
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551 | char *cp1; |
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552 | char *cp2; |
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553 | char *remoteFilename; |
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554 | rtems_interval now; |
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555 | rtems_status_code sc; |
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556 | char *hostname; |
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557 | |
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558 | /* |
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559 | * Extract the host name component |
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560 | */ |
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561 | cp2 = full_path_name; |
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562 | while (*cp2 == '/') |
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563 | cp2++; |
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564 | hostname = cp2; |
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565 | while (*cp2 != '/') { |
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566 | if (*cp2 == '\0') |
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567 | return ENOENT; |
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568 | cp2++; |
---|
569 | } |
---|
570 | *cp2++ = '\0'; |
---|
571 | |
---|
572 | /* |
---|
573 | * Convert hostname to Internet address |
---|
574 | */ |
---|
575 | if (strcmp (hostname, "BOOTP_HOST") == 0) |
---|
576 | farAddress = rtems_bsdnet_bootp_server_address; |
---|
577 | else |
---|
578 | farAddress.s_addr = inet_addr (hostname); |
---|
579 | if ((farAddress.s_addr == 0) || (farAddress.s_addr == ~0)) |
---|
580 | return ENOENT; |
---|
581 | |
---|
582 | /* |
---|
583 | * Extract file pathname component |
---|
584 | */ |
---|
585 | while (*cp2 == '/') |
---|
586 | cp2++; |
---|
587 | if (strcmp (cp2, "BOOTP_FILE") == 0) { |
---|
588 | cp2 = rtems_bsdnet_bootp_boot_file_name; |
---|
589 | while (*cp2 == '/') |
---|
590 | cp2++; |
---|
591 | } |
---|
592 | if (*cp2 == '\0') |
---|
593 | return ENOENT; |
---|
594 | remoteFilename = cp2; |
---|
595 | if (strlen (remoteFilename) > (TFTP_BUFSIZE - 10)) |
---|
596 | return ENOENT; |
---|
597 | |
---|
598 | /* |
---|
599 | * Find a free stream |
---|
600 | */ |
---|
601 | sc = rtems_semaphore_obtain (tftp_mutex, RTEMS_WAIT, RTEMS_NO_TIMEOUT); |
---|
602 | if (sc != RTEMS_SUCCESSFUL) |
---|
603 | return EBUSY; |
---|
604 | for (s = 0 ; s < nStreams ; s++) { |
---|
605 | if (tftpStreams[s] == NULL) |
---|
606 | break; |
---|
607 | } |
---|
608 | if (s == nStreams) { |
---|
609 | /* |
---|
610 | * Reallocate stream pointers |
---|
611 | * Guard against the case where realloc() returns NULL. |
---|
612 | */ |
---|
613 | struct tftpStream **np; |
---|
614 | |
---|
615 | np = realloc (tftpStreams, ++nStreams * sizeof *tftpStreams); |
---|
616 | if (np == NULL) { |
---|
617 | rtems_semaphore_release (tftp_mutex); |
---|
618 | return ENOMEM; |
---|
619 | } |
---|
620 | tftpStreams = np; |
---|
621 | } |
---|
622 | tp = tftpStreams[s] = malloc (sizeof (struct tftpStream)); |
---|
623 | rtems_semaphore_release (tftp_mutex); |
---|
624 | if (tp == NULL) |
---|
625 | return ENOMEM; |
---|
626 | iop->data0 = s; |
---|
627 | iop->data1 = tp; |
---|
628 | |
---|
629 | /* |
---|
630 | * Create the socket |
---|
631 | */ |
---|
632 | if ((tp->socket = socket (AF_INET, SOCK_DGRAM, 0)) < 0) { |
---|
633 | releaseStream (s); |
---|
634 | return ENOMEM; |
---|
635 | } |
---|
636 | |
---|
637 | /* |
---|
638 | * Bind the socket to a local address |
---|
639 | */ |
---|
640 | retryCount = 0; |
---|
641 | rtems_clock_get (RTEMS_CLOCK_GET_TICKS_SINCE_BOOT, &now); |
---|
642 | for (;;) { |
---|
643 | int try = (now + retryCount) % 10; |
---|
644 | |
---|
645 | tp->myAddress.sin_family = AF_INET; |
---|
646 | tp->myAddress.sin_port = htons (UDP_PORT_BASE + nStreams * try + s); |
---|
647 | tp->myAddress.sin_addr.s_addr = htonl (INADDR_ANY); |
---|
648 | if (bind (tp->socket, (struct sockaddr *)&tp->myAddress, sizeof tp->myAddress) >= 0) |
---|
649 | break; |
---|
650 | if (++retryCount == 10) { |
---|
651 | close (tp->socket); |
---|
652 | releaseStream (s); |
---|
653 | return EBUSY; |
---|
654 | } |
---|
655 | } |
---|
656 | |
---|
657 | /* |
---|
658 | * Set the UDP destination to the TFTP server |
---|
659 | * port on the remote machine. |
---|
660 | */ |
---|
661 | tp->farAddress.sin_family = AF_INET; |
---|
662 | tp->farAddress.sin_addr = farAddress; |
---|
663 | tp->farAddress.sin_port = htons (69); |
---|
664 | |
---|
665 | /* |
---|
666 | * Start the transfer |
---|
667 | */ |
---|
668 | tp->firstReply = 1; |
---|
669 | retryCount = 0; |
---|
670 | for (;;) { |
---|
671 | /* |
---|
672 | * Create the request |
---|
673 | */ |
---|
674 | if ((flags & O_ACCMODE) == O_RDONLY) { |
---|
675 | tp->writing = 0; |
---|
676 | tp->pkbuf.tftpRWRQ.opcode = htons (TFTP_OPCODE_RRQ); |
---|
677 | } |
---|
678 | else { |
---|
679 | tp->writing = 1; |
---|
680 | tp->pkbuf.tftpRWRQ.opcode = htons (TFTP_OPCODE_WRQ); |
---|
681 | } |
---|
682 | cp1 = (char *) tp->pkbuf.tftpRWRQ.filename_mode; |
---|
683 | cp2 = (char *) remoteFilename; |
---|
684 | while ((*cp1++ = *cp2++) != '\0') |
---|
685 | continue; |
---|
686 | cp2 = "octet"; |
---|
687 | while ((*cp1++ = *cp2++) != '\0') |
---|
688 | continue; |
---|
689 | len = cp1 - (char *)&tp->pkbuf.tftpRWRQ; |
---|
690 | |
---|
691 | /* |
---|
692 | * Send the request |
---|
693 | */ |
---|
694 | if (sendto (tp->socket, (char *)&tp->pkbuf, len, 0, |
---|
695 | (struct sockaddr *)&tp->farAddress, |
---|
696 | sizeof tp->farAddress) < 0) { |
---|
697 | close (tp->socket); |
---|
698 | releaseStream (s); |
---|
699 | return EIO; |
---|
700 | } |
---|
701 | |
---|
702 | /* |
---|
703 | * Get reply |
---|
704 | */ |
---|
705 | len = getPacket (tp, retryCount); |
---|
706 | if (len >= (int) sizeof tp->pkbuf.tftpACK) { |
---|
707 | int opcode = ntohs (tp->pkbuf.tftpDATA.opcode); |
---|
708 | if (!tp->writing |
---|
709 | && (opcode == TFTP_OPCODE_DATA) |
---|
710 | && (ntohs (tp->pkbuf.tftpDATA.blocknum) == 1)) { |
---|
711 | tp->nused = 0; |
---|
712 | tp->blocknum = 1; |
---|
713 | tp->nleft = len - 2 * sizeof (uint16_t ); |
---|
714 | tp->eof = (tp->nleft < TFTP_BUFSIZE); |
---|
715 | if (sendAck (tp) != 0) { |
---|
716 | close (tp->socket); |
---|
717 | releaseStream (s); |
---|
718 | return EIO; |
---|
719 | } |
---|
720 | break; |
---|
721 | } |
---|
722 | if (tp->writing |
---|
723 | && (opcode == TFTP_OPCODE_ACK) |
---|
724 | && (ntohs (tp->pkbuf.tftpACK.blocknum) == 0)) { |
---|
725 | tp->nused = 0; |
---|
726 | tp->blocknum = 1; |
---|
727 | break; |
---|
728 | } |
---|
729 | if (opcode == TFTP_OPCODE_ERROR) { |
---|
730 | int e = tftpErrno (tp); |
---|
731 | close (tp->socket); |
---|
732 | releaseStream (s); |
---|
733 | return e; |
---|
734 | } |
---|
735 | } |
---|
736 | |
---|
737 | /* |
---|
738 | * Keep trying |
---|
739 | */ |
---|
740 | if (++retryCount >= OPEN_RETRY_LIMIT) { |
---|
741 | close (tp->socket); |
---|
742 | releaseStream (s); |
---|
743 | return EIO; |
---|
744 | } |
---|
745 | } |
---|
746 | return 0; |
---|
747 | } |
---|
748 | |
---|
749 | /* |
---|
750 | * The IMFS open handler |
---|
751 | */ |
---|
752 | static int rtems_tftp_open( |
---|
753 | rtems_libio_t *iop, |
---|
754 | const char *new_name, |
---|
755 | uint32_t flags, |
---|
756 | uint32_t mode |
---|
757 | ) |
---|
758 | { |
---|
759 | char *full_path_name; |
---|
760 | char *s1; |
---|
761 | int err; |
---|
762 | |
---|
763 | /* |
---|
764 | * Tack the `current directory' on to relative paths. |
---|
765 | * We know that the current directory ends in a / character. |
---|
766 | */ |
---|
767 | if (*new_name == '/') { |
---|
768 | /* |
---|
769 | * Skip the TFTP filesystem prefix. |
---|
770 | */ |
---|
771 | int len = strlen (TFTP_PATHNAME_PREFIX); |
---|
772 | if (strncmp (new_name, TFTP_PATHNAME_PREFIX, len)) |
---|
773 | return ENOENT; |
---|
774 | new_name += len; |
---|
775 | s1 = ""; |
---|
776 | } |
---|
777 | else { |
---|
778 | s1 = rtems_filesystem_current.node_access; |
---|
779 | } |
---|
780 | full_path_name = malloc (strlen (s1) + strlen (new_name) + 1); |
---|
781 | if (full_path_name == NULL) |
---|
782 | return ENOMEM; |
---|
783 | strcpy (full_path_name, s1); |
---|
784 | strcat (full_path_name, new_name); |
---|
785 | fixPath (full_path_name); |
---|
786 | err = rtems_tftp_open_worker (iop, full_path_name, flags, mode); |
---|
787 | free (full_path_name); |
---|
788 | return err; |
---|
789 | } |
---|
790 | |
---|
791 | /* |
---|
792 | * Read from a TFTP stream |
---|
793 | */ |
---|
794 | static ssize_t rtems_tftp_read( |
---|
795 | rtems_libio_t *iop, |
---|
796 | void *buffer, |
---|
797 | size_t count |
---|
798 | ) |
---|
799 | { |
---|
800 | char *bp; |
---|
801 | struct tftpStream *tp = iop->data1; |
---|
802 | int retryCount; |
---|
803 | int nwant; |
---|
804 | |
---|
805 | |
---|
806 | /* |
---|
807 | * Read till user request is satisfied or EOF is reached |
---|
808 | */ |
---|
809 | bp = buffer; |
---|
810 | nwant = count; |
---|
811 | while (nwant) { |
---|
812 | if (tp->nleft) { |
---|
813 | int ncopy; |
---|
814 | if (nwant < tp->nleft) |
---|
815 | ncopy = nwant; |
---|
816 | else |
---|
817 | ncopy = tp->nleft; |
---|
818 | memcpy (bp, &tp->pkbuf.tftpDATA.data[tp->nused], ncopy); |
---|
819 | tp->nused += ncopy; |
---|
820 | tp->nleft -= ncopy; |
---|
821 | bp += ncopy; |
---|
822 | nwant -= ncopy; |
---|
823 | if (nwant == 0) |
---|
824 | break; |
---|
825 | } |
---|
826 | if (tp->eof) |
---|
827 | break; |
---|
828 | |
---|
829 | /* |
---|
830 | * Wait for the next packet |
---|
831 | */ |
---|
832 | retryCount = 0; |
---|
833 | for (;;) { |
---|
834 | int len = getPacket (tp, retryCount); |
---|
835 | if (len >= (int)sizeof tp->pkbuf.tftpACK) { |
---|
836 | int opcode = ntohs (tp->pkbuf.tftpDATA.opcode); |
---|
837 | uint16_t nextBlock = tp->blocknum + 1; |
---|
838 | if ((opcode == TFTP_OPCODE_DATA) |
---|
839 | && (ntohs (tp->pkbuf.tftpDATA.blocknum) == nextBlock)) { |
---|
840 | tp->nused = 0; |
---|
841 | tp->nleft = len - 2 * sizeof (uint16_t ); |
---|
842 | tp->eof = (tp->nleft < TFTP_BUFSIZE); |
---|
843 | tp->blocknum++; |
---|
844 | if (sendAck (tp) != 0) |
---|
845 | rtems_set_errno_and_return_minus_one( EIO ); |
---|
846 | break; |
---|
847 | } |
---|
848 | if (opcode == TFTP_OPCODE_ERROR) |
---|
849 | rtems_set_errno_and_return_minus_one( tftpErrno (tp) ); |
---|
850 | } |
---|
851 | |
---|
852 | /* |
---|
853 | * Keep trying? |
---|
854 | */ |
---|
855 | if (++retryCount == IO_RETRY_LIMIT) |
---|
856 | rtems_set_errno_and_return_minus_one( EIO ); |
---|
857 | if (sendAck (tp) != 0) |
---|
858 | rtems_set_errno_and_return_minus_one( EIO ); |
---|
859 | } |
---|
860 | } |
---|
861 | return count - nwant; |
---|
862 | } |
---|
863 | |
---|
864 | /* |
---|
865 | * Flush a write buffer and wait for acknowledgement |
---|
866 | */ |
---|
867 | static int rtems_tftp_flush ( struct tftpStream *tp ) |
---|
868 | { |
---|
869 | int wlen, rlen; |
---|
870 | int retryCount = 0; |
---|
871 | |
---|
872 | wlen = tp->nused + 2 * sizeof (uint16_t ); |
---|
873 | for (;;) { |
---|
874 | tp->pkbuf.tftpDATA.opcode = htons (TFTP_OPCODE_DATA); |
---|
875 | tp->pkbuf.tftpDATA.blocknum = htons (tp->blocknum); |
---|
876 | #ifdef RTEMS_TFTP_DRIVER_DEBUG |
---|
877 | if (rtems_tftp_driver_debug) |
---|
878 | printf ("TFTP: SEND %d (%d)\n", tp->blocknum, tp->nused); |
---|
879 | #endif |
---|
880 | if (sendto (tp->socket, (char *)&tp->pkbuf, wlen, 0, |
---|
881 | (struct sockaddr *)&tp->farAddress, |
---|
882 | sizeof tp->farAddress) < 0) |
---|
883 | return EIO; |
---|
884 | rlen = getPacket (tp, retryCount); |
---|
885 | /* |
---|
886 | * Our last packet won't necessarily be acknowledged! |
---|
887 | */ |
---|
888 | if ((rlen < 0) && (tp->nused < sizeof tp->pkbuf.tftpDATA.data)) |
---|
889 | return 0; |
---|
890 | if (rlen >= (int)sizeof tp->pkbuf.tftpACK) { |
---|
891 | int opcode = ntohs (tp->pkbuf.tftpACK.opcode); |
---|
892 | if ((opcode == TFTP_OPCODE_ACK) |
---|
893 | && (ntohs (tp->pkbuf.tftpACK.blocknum) == tp->blocknum)) { |
---|
894 | tp->nused = 0; |
---|
895 | tp->blocknum++; |
---|
896 | return 0; |
---|
897 | } |
---|
898 | if (opcode == TFTP_OPCODE_ERROR) |
---|
899 | return tftpErrno (tp); |
---|
900 | } |
---|
901 | |
---|
902 | /* |
---|
903 | * Keep trying? |
---|
904 | */ |
---|
905 | if (++retryCount == IO_RETRY_LIMIT) |
---|
906 | return EIO; |
---|
907 | } |
---|
908 | } |
---|
909 | |
---|
910 | /* |
---|
911 | * Close a TFTP stream |
---|
912 | */ |
---|
913 | static int rtems_tftp_close( |
---|
914 | rtems_libio_t *iop |
---|
915 | ) |
---|
916 | { |
---|
917 | struct tftpStream *tp = iop->data1;; |
---|
918 | |
---|
919 | if (tp->writing) |
---|
920 | rtems_tftp_flush (tp); |
---|
921 | if (!tp->eof && !tp->firstReply) { |
---|
922 | /* |
---|
923 | * Tell the other end to stop |
---|
924 | */ |
---|
925 | rtems_interval ticksPerSecond; |
---|
926 | sendStifle (tp, &tp->farAddress); |
---|
927 | rtems_clock_get (RTEMS_CLOCK_GET_TICKS_PER_SECOND, &ticksPerSecond); |
---|
928 | rtems_task_wake_after (1 + ticksPerSecond / 10); |
---|
929 | } |
---|
930 | close (tp->socket); |
---|
931 | releaseStream (iop->data0); |
---|
932 | return RTEMS_SUCCESSFUL; |
---|
933 | } |
---|
934 | |
---|
935 | static ssize_t rtems_tftp_write( |
---|
936 | rtems_libio_t *iop, |
---|
937 | const void *buffer, |
---|
938 | size_t count |
---|
939 | ) |
---|
940 | { |
---|
941 | const char *bp; |
---|
942 | struct tftpStream *tp = iop->data1; |
---|
943 | int nleft, nfree, ncopy; |
---|
944 | |
---|
945 | /* |
---|
946 | * Bail out if an error has occurred |
---|
947 | */ |
---|
948 | if (!tp->writing) |
---|
949 | return EIO; |
---|
950 | |
---|
951 | |
---|
952 | /* |
---|
953 | * Write till user request is satisfied |
---|
954 | * Notice that the buffer is flushed as soon as it is filled rather |
---|
955 | * than waiting for the next write or a close. This ensures that |
---|
956 | * the flush in close writes a less than full buffer so the far |
---|
957 | * end can detect the end-of-file condition. |
---|
958 | */ |
---|
959 | bp = buffer; |
---|
960 | nleft = count; |
---|
961 | while (nleft) { |
---|
962 | nfree = sizeof tp->pkbuf.tftpDATA.data - tp->nused; |
---|
963 | if (nleft < nfree) |
---|
964 | ncopy = nleft; |
---|
965 | else |
---|
966 | ncopy = nfree; |
---|
967 | memcpy (&tp->pkbuf.tftpDATA.data[tp->nused], bp, ncopy); |
---|
968 | tp->nused += ncopy; |
---|
969 | nleft -= ncopy; |
---|
970 | bp += ncopy; |
---|
971 | if (tp->nused == sizeof tp->pkbuf.tftpDATA.data) { |
---|
972 | int e = rtems_tftp_flush (tp); |
---|
973 | if (e) { |
---|
974 | tp->writing = 0; |
---|
975 | rtems_set_errno_and_return_minus_one (e); |
---|
976 | } |
---|
977 | } |
---|
978 | } |
---|
979 | return count; |
---|
980 | } |
---|
981 | |
---|
982 | /* |
---|
983 | * Dummy version to let fopen(xxxx,"w") work properly. |
---|
984 | */ |
---|
985 | static int rtems_tftp_ftruncate( |
---|
986 | rtems_libio_t *iop, |
---|
987 | off_t count |
---|
988 | ) |
---|
989 | { |
---|
990 | return 0; |
---|
991 | } |
---|
992 | |
---|
993 | static rtems_filesystem_node_types_t rtems_tftp_node_type( |
---|
994 | rtems_filesystem_location_info_t *pathloc /* IN */ |
---|
995 | ) |
---|
996 | { |
---|
997 | if ((pathloc->node_access == NULL) |
---|
998 | || (pathloc->node_access == ROOT_NODE_ACCESS)) |
---|
999 | return RTEMS_FILESYSTEM_MEMORY_FILE; |
---|
1000 | return RTEMS_FILESYSTEM_DIRECTORY; |
---|
1001 | } |
---|
1002 | |
---|
1003 | static int rtems_tftp_free_node_info( |
---|
1004 | rtems_filesystem_location_info_t *pathloc /* IN */ |
---|
1005 | ) |
---|
1006 | { |
---|
1007 | if (pathloc->node_access && (pathloc->node_access != ROOT_NODE_ACCESS)) { |
---|
1008 | free (pathloc->node_access); |
---|
1009 | pathloc->node_access = NULL; |
---|
1010 | } |
---|
1011 | return 0; |
---|
1012 | } |
---|
1013 | |
---|
1014 | |
---|
1015 | rtems_filesystem_operations_table rtems_tftp_ops = { |
---|
1016 | rtems_tftp_eval_path, /* eval_path */ |
---|
1017 | rtems_tftp_evaluate_for_make, /* evaluate_for_make */ |
---|
1018 | NULL, /* link */ |
---|
1019 | NULL, /* unlink */ |
---|
1020 | rtems_tftp_node_type, /* node_type */ |
---|
1021 | NULL, /* mknod */ |
---|
1022 | NULL, /* chown */ |
---|
1023 | rtems_tftp_free_node_info, /* freenodinfo */ |
---|
1024 | NULL, /* mount */ |
---|
1025 | rtems_tftp_mount_me, /* initialize */ |
---|
1026 | NULL, /* unmount */ |
---|
1027 | NULL, /* fsunmount */ |
---|
1028 | NULL, /* utime, */ |
---|
1029 | NULL, /* evaluate_link */ |
---|
1030 | NULL, /* symlink */ |
---|
1031 | NULL, /* readlin */ |
---|
1032 | }; |
---|
1033 | |
---|
1034 | rtems_filesystem_file_handlers_r rtems_tftp_handlers = { |
---|
1035 | rtems_tftp_open, /* open */ |
---|
1036 | rtems_tftp_close, /* close */ |
---|
1037 | rtems_tftp_read, /* read */ |
---|
1038 | rtems_tftp_write, /* write */ |
---|
1039 | NULL, /* ioctl */ |
---|
1040 | NULL, /* lseek */ |
---|
1041 | NULL, /* fstat */ |
---|
1042 | NULL, /* fchmod */ |
---|
1043 | rtems_tftp_ftruncate, /* ftruncate */ |
---|
1044 | NULL, /* fpathconf */ |
---|
1045 | NULL, /* fsync */ |
---|
1046 | NULL, /* fdatasync */ |
---|
1047 | NULL, /* fcntl */ |
---|
1048 | NULL /* rmnod */ |
---|
1049 | }; |
---|