1 | /***************************************************************************
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2 | * _ _ ____ _
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3 | * Project ___| | | | _ \| |
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4 | * / __| | | | |_) | |
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5 | * | (__| |_| | _ <| |___
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6 | * \___|\___/|_| \_\_____|
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7 | *
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8 | * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
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9 | *
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10 | * This software is licensed as described in the file COPYING, which
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11 | * you should have received as part of this distribution. The terms
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12 | * are also available at https://curl.haxx.se/docs/copyright.html.
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13 | *
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14 | * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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15 | * copies of the Software, and permit persons to whom the Software is
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16 | * furnished to do so, under the terms of the COPYING file.
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17 | *
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18 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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19 | * KIND, either express or implied.
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20 | *
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21 | ***************************************************************************/
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22 |
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23 | #include "curl_setup.h"
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24 |
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25 | #ifndef CURL_DISABLE_TFTP
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26 |
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27 | #ifdef HAVE_NETINET_IN_H
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28 | #include <netinet/in.h>
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29 | #endif
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30 | #ifdef HAVE_NETDB_H
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31 | #include <netdb.h>
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32 | #endif
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33 | #ifdef HAVE_ARPA_INET_H
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34 | #include <arpa/inet.h>
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35 | #endif
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36 | #ifdef HAVE_NET_IF_H
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37 | #include <net/if.h>
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38 | #endif
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39 | #ifdef HAVE_SYS_IOCTL_H
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40 | #include <sys/ioctl.h>
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41 | #endif
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42 |
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43 | #ifdef HAVE_SYS_PARAM_H
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44 | #include <sys/param.h>
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45 | #endif
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46 |
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47 | #include "urldata.h"
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48 | #include <curl/curl.h>
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49 | #include "transfer.h"
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50 | #include "sendf.h"
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51 | #include "tftp.h"
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52 | #include "progress.h"
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53 | #include "connect.h"
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54 | #include "strerror.h"
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55 | #include "sockaddr.h" /* required for Curl_sockaddr_storage */
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56 | #include "multiif.h"
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57 | #include "url.h"
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58 | #include "strcase.h"
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59 | #include "speedcheck.h"
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60 | #include "select.h"
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61 | #include "escape.h"
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62 |
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63 | /* The last 3 #include files should be in this order */
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64 | #include "curl_printf.h"
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65 | #include "curl_memory.h"
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66 | #include "memdebug.h"
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67 |
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68 | /* RFC2348 allows the block size to be negotiated */
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69 | #define TFTP_BLKSIZE_DEFAULT 512
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70 | #define TFTP_BLKSIZE_MIN 8
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71 | #define TFTP_BLKSIZE_MAX 65464
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72 | #define TFTP_OPTION_BLKSIZE "blksize"
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73 |
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74 | /* from RFC2349: */
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75 | #define TFTP_OPTION_TSIZE "tsize"
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76 | #define TFTP_OPTION_INTERVAL "timeout"
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77 |
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78 | typedef enum {
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79 | TFTP_MODE_NETASCII = 0,
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80 | TFTP_MODE_OCTET
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81 | } tftp_mode_t;
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82 |
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83 | typedef enum {
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84 | TFTP_STATE_START = 0,
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85 | TFTP_STATE_RX,
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86 | TFTP_STATE_TX,
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87 | TFTP_STATE_FIN
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88 | } tftp_state_t;
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89 |
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90 | typedef enum {
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91 | TFTP_EVENT_NONE = -1,
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92 | TFTP_EVENT_INIT = 0,
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93 | TFTP_EVENT_RRQ = 1,
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94 | TFTP_EVENT_WRQ = 2,
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95 | TFTP_EVENT_DATA = 3,
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96 | TFTP_EVENT_ACK = 4,
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97 | TFTP_EVENT_ERROR = 5,
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98 | TFTP_EVENT_OACK = 6,
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99 | TFTP_EVENT_TIMEOUT
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100 | } tftp_event_t;
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101 |
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102 | typedef enum {
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103 | TFTP_ERR_UNDEF = 0,
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104 | TFTP_ERR_NOTFOUND,
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105 | TFTP_ERR_PERM,
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106 | TFTP_ERR_DISKFULL,
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107 | TFTP_ERR_ILLEGAL,
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108 | TFTP_ERR_UNKNOWNID,
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109 | TFTP_ERR_EXISTS,
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110 | TFTP_ERR_NOSUCHUSER, /* This will never be triggered by this code */
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111 |
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112 | /* The remaining error codes are internal to curl */
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113 | TFTP_ERR_NONE = -100,
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114 | TFTP_ERR_TIMEOUT,
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115 | TFTP_ERR_NORESPONSE
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116 | } tftp_error_t;
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117 |
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118 | typedef struct tftp_packet {
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119 | unsigned char *data;
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120 | } tftp_packet_t;
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121 |
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122 | typedef struct tftp_state_data {
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123 | tftp_state_t state;
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124 | tftp_mode_t mode;
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125 | tftp_error_t error;
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126 | tftp_event_t event;
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127 | struct connectdata *conn;
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128 | curl_socket_t sockfd;
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129 | int retries;
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130 | int retry_time;
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131 | int retry_max;
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132 | time_t start_time;
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133 | time_t max_time;
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134 | time_t rx_time;
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135 | unsigned short block;
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136 | struct Curl_sockaddr_storage local_addr;
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137 | struct Curl_sockaddr_storage remote_addr;
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138 | curl_socklen_t remote_addrlen;
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139 | int rbytes;
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140 | int sbytes;
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141 | int blksize;
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142 | int requested_blksize;
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143 | tftp_packet_t rpacket;
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144 | tftp_packet_t spacket;
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145 | } tftp_state_data_t;
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146 |
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147 |
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148 | /* Forward declarations */
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149 | static CURLcode tftp_rx(tftp_state_data_t *state, tftp_event_t event);
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150 | static CURLcode tftp_tx(tftp_state_data_t *state, tftp_event_t event);
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151 | static CURLcode tftp_connect(struct connectdata *conn, bool *done);
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152 | static CURLcode tftp_disconnect(struct connectdata *conn,
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153 | bool dead_connection);
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154 | static CURLcode tftp_do(struct connectdata *conn, bool *done);
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155 | static CURLcode tftp_done(struct connectdata *conn,
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156 | CURLcode, bool premature);
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157 | static CURLcode tftp_setup_connection(struct connectdata * conn);
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158 | static CURLcode tftp_multi_statemach(struct connectdata *conn, bool *done);
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159 | static CURLcode tftp_doing(struct connectdata *conn, bool *dophase_done);
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160 | static int tftp_getsock(struct connectdata *conn, curl_socket_t *socks,
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161 | int numsocks);
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162 | static CURLcode tftp_translate_code(tftp_error_t error);
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163 |
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164 |
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165 | /*
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166 | * TFTP protocol handler.
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167 | */
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168 |
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169 | const struct Curl_handler Curl_handler_tftp = {
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170 | "TFTP", /* scheme */
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171 | tftp_setup_connection, /* setup_connection */
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172 | tftp_do, /* do_it */
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173 | tftp_done, /* done */
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174 | ZERO_NULL, /* do_more */
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175 | tftp_connect, /* connect_it */
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176 | tftp_multi_statemach, /* connecting */
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177 | tftp_doing, /* doing */
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178 | tftp_getsock, /* proto_getsock */
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179 | tftp_getsock, /* doing_getsock */
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180 | ZERO_NULL, /* domore_getsock */
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181 | ZERO_NULL, /* perform_getsock */
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182 | tftp_disconnect, /* disconnect */
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183 | ZERO_NULL, /* readwrite */
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184 | ZERO_NULL, /* connection_check */
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185 | PORT_TFTP, /* defport */
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186 | CURLPROTO_TFTP, /* protocol */
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187 | PROTOPT_NONE | PROTOPT_NOURLQUERY /* flags */
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188 | };
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189 |
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190 | /**********************************************************
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191 | *
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192 | * tftp_set_timeouts -
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193 | *
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194 | * Set timeouts based on state machine state.
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195 | * Use user provided connect timeouts until DATA or ACK
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196 | * packet is received, then use user-provided transfer timeouts
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197 | *
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198 | *
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199 | **********************************************************/
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200 | static CURLcode tftp_set_timeouts(tftp_state_data_t *state)
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201 | {
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202 | time_t maxtime, timeout;
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203 | timediff_t timeout_ms;
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204 | bool start = (state->state == TFTP_STATE_START) ? TRUE : FALSE;
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205 |
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206 | time(&state->start_time);
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207 |
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208 | /* Compute drop-dead time */
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209 | timeout_ms = Curl_timeleft(state->conn->data, NULL, start);
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210 |
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211 | if(timeout_ms < 0) {
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212 | /* time-out, bail out, go home */
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213 | failf(state->conn->data, "Connection time-out");
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214 | return CURLE_OPERATION_TIMEDOUT;
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215 | }
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216 |
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217 | if(start) {
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218 |
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219 | maxtime = (time_t)(timeout_ms + 500) / 1000;
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220 | state->max_time = state->start_time + maxtime;
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221 |
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222 | /* Set per-block timeout to total */
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223 | timeout = maxtime;
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224 |
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225 | /* Average restart after 5 seconds */
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226 | state->retry_max = (int)timeout/5;
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227 |
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228 | if(state->retry_max < 1)
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229 | /* avoid division by zero below */
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230 | state->retry_max = 1;
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231 |
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232 | /* Compute the re-start interval to suit the timeout */
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233 | state->retry_time = (int)timeout/state->retry_max;
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234 | if(state->retry_time<1)
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235 | state->retry_time = 1;
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236 |
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237 | }
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238 | else {
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239 | if(timeout_ms > 0)
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240 | maxtime = (time_t)(timeout_ms + 500) / 1000;
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241 | else
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242 | maxtime = 3600;
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243 |
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244 | state->max_time = state->start_time + maxtime;
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245 |
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246 | /* Set per-block timeout to total */
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247 | timeout = maxtime;
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248 |
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249 | /* Average reposting an ACK after 5 seconds */
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250 | state->retry_max = (int)timeout/5;
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251 | }
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252 | /* But bound the total number */
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253 | if(state->retry_max<3)
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254 | state->retry_max = 3;
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255 |
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256 | if(state->retry_max>50)
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257 | state->retry_max = 50;
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258 |
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259 | /* Compute the re-ACK interval to suit the timeout */
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260 | state->retry_time = (int)(timeout/state->retry_max);
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261 | if(state->retry_time<1)
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262 | state->retry_time = 1;
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263 |
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264 | infof(state->conn->data,
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265 | "set timeouts for state %d; Total %ld, retry %d maxtry %d\n",
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266 | (int)state->state, (long)(state->max_time-state->start_time),
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267 | state->retry_time, state->retry_max);
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268 |
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269 | /* init RX time */
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270 | time(&state->rx_time);
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271 |
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272 | return CURLE_OK;
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273 | }
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274 |
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275 | /**********************************************************
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276 | *
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277 | * tftp_set_send_first
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278 | *
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279 | * Event handler for the START state
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280 | *
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281 | **********************************************************/
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282 |
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283 | static void setpacketevent(tftp_packet_t *packet, unsigned short num)
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284 | {
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285 | packet->data[0] = (unsigned char)(num >> 8);
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286 | packet->data[1] = (unsigned char)(num & 0xff);
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287 | }
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288 |
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289 |
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290 | static void setpacketblock(tftp_packet_t *packet, unsigned short num)
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291 | {
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292 | packet->data[2] = (unsigned char)(num >> 8);
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293 | packet->data[3] = (unsigned char)(num & 0xff);
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294 | }
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295 |
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296 | static unsigned short getrpacketevent(const tftp_packet_t *packet)
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297 | {
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298 | return (unsigned short)((packet->data[0] << 8) | packet->data[1]);
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299 | }
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300 |
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301 | static unsigned short getrpacketblock(const tftp_packet_t *packet)
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302 | {
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303 | return (unsigned short)((packet->data[2] << 8) | packet->data[3]);
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304 | }
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305 |
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306 | static size_t Curl_strnlen(const char *string, size_t maxlen)
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307 | {
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308 | const char *end = memchr(string, '\0', maxlen);
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309 | return end ? (size_t) (end - string) : maxlen;
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310 | }
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311 |
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312 | static const char *tftp_option_get(const char *buf, size_t len,
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313 | const char **option, const char **value)
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314 | {
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315 | size_t loc;
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316 |
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317 | loc = Curl_strnlen(buf, len);
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318 | loc++; /* NULL term */
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319 |
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320 | if(loc >= len)
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321 | return NULL;
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322 | *option = buf;
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323 |
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324 | loc += Curl_strnlen(buf + loc, len-loc);
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325 | loc++; /* NULL term */
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326 |
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327 | if(loc > len)
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328 | return NULL;
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329 | *value = &buf[strlen(*option) + 1];
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330 |
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331 | return &buf[loc];
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332 | }
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333 |
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334 | static CURLcode tftp_parse_option_ack(tftp_state_data_t *state,
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335 | const char *ptr, int len)
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336 | {
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337 | const char *tmp = ptr;
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338 | struct Curl_easy *data = state->conn->data;
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339 |
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340 | /* if OACK doesn't contain blksize option, the default (512) must be used */
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341 | state->blksize = TFTP_BLKSIZE_DEFAULT;
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342 |
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343 | while(tmp < ptr + len) {
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344 | const char *option, *value;
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345 |
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346 | tmp = tftp_option_get(tmp, ptr + len - tmp, &option, &value);
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347 | if(tmp == NULL) {
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348 | failf(data, "Malformed ACK packet, rejecting");
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349 | return CURLE_TFTP_ILLEGAL;
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350 | }
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351 |
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352 | infof(data, "got option=(%s) value=(%s)\n", option, value);
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353 |
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354 | if(checkprefix(option, TFTP_OPTION_BLKSIZE)) {
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355 | long blksize;
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356 |
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357 | blksize = strtol(value, NULL, 10);
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358 |
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359 | if(!blksize) {
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360 | failf(data, "invalid blocksize value in OACK packet");
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361 | return CURLE_TFTP_ILLEGAL;
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362 | }
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363 | if(blksize > TFTP_BLKSIZE_MAX) {
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364 | failf(data, "%s (%d)", "blksize is larger than max supported",
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365 | TFTP_BLKSIZE_MAX);
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366 | return CURLE_TFTP_ILLEGAL;
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367 | }
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368 | else if(blksize < TFTP_BLKSIZE_MIN) {
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369 | failf(data, "%s (%d)", "blksize is smaller than min supported",
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370 | TFTP_BLKSIZE_MIN);
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371 | return CURLE_TFTP_ILLEGAL;
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372 | }
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373 | else if(blksize > state->requested_blksize) {
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374 | /* could realloc pkt buffers here, but the spec doesn't call out
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375 | * support for the server requesting a bigger blksize than the client
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376 | * requests */
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377 | failf(data, "%s (%ld)",
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378 | "server requested blksize larger than allocated", blksize);
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379 | return CURLE_TFTP_ILLEGAL;
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380 | }
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381 |
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382 | state->blksize = (int)blksize;
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383 | infof(data, "%s (%d) %s (%d)\n", "blksize parsed from OACK",
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384 | state->blksize, "requested", state->requested_blksize);
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385 | }
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386 | else if(checkprefix(option, TFTP_OPTION_TSIZE)) {
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387 | long tsize = 0;
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388 |
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389 | tsize = strtol(value, NULL, 10);
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390 | infof(data, "%s (%ld)\n", "tsize parsed from OACK", tsize);
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391 |
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392 | /* tsize should be ignored on upload: Who cares about the size of the
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393 | remote file? */
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394 | if(!data->set.upload) {
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395 | if(!tsize) {
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396 | failf(data, "invalid tsize -:%s:- value in OACK packet", value);
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397 | return CURLE_TFTP_ILLEGAL;
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398 | }
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399 | Curl_pgrsSetDownloadSize(data, tsize);
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400 | }
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401 | }
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402 | }
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403 |
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404 | return CURLE_OK;
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405 | }
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406 |
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407 | static size_t tftp_option_add(tftp_state_data_t *state, size_t csize,
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408 | char *buf, const char *option)
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409 | {
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410 | if(( strlen(option) + csize + 1) > (size_t)state->blksize)
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411 | return 0;
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412 | strcpy(buf, option);
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413 | return strlen(option) + 1;
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414 | }
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415 |
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416 | static CURLcode tftp_connect_for_tx(tftp_state_data_t *state,
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417 | tftp_event_t event)
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418 | {
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419 | CURLcode result;
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420 | #ifndef CURL_DISABLE_VERBOSE_STRINGS
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421 | struct Curl_easy *data = state->conn->data;
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422 |
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423 | infof(data, "%s\n", "Connected for transmit");
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424 | #endif
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425 | state->state = TFTP_STATE_TX;
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426 | result = tftp_set_timeouts(state);
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427 | if(result)
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428 | return result;
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429 | return tftp_tx(state, event);
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430 | }
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431 |
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432 | static CURLcode tftp_connect_for_rx(tftp_state_data_t *state,
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433 | tftp_event_t event)
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434 | {
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435 | CURLcode result;
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436 | #ifndef CURL_DISABLE_VERBOSE_STRINGS
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437 | struct Curl_easy *data = state->conn->data;
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438 |
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439 | infof(data, "%s\n", "Connected for receive");
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440 | #endif
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441 | state->state = TFTP_STATE_RX;
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442 | result = tftp_set_timeouts(state);
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443 | if(result)
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444 | return result;
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445 | return tftp_rx(state, event);
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446 | }
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447 |
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448 | static CURLcode tftp_send_first(tftp_state_data_t *state, tftp_event_t event)
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449 | {
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450 | size_t sbytes;
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451 | ssize_t senddata;
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452 | const char *mode = "octet";
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453 | char *filename;
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---|
454 | char buf[64];
|
---|
455 | struct Curl_easy *data = state->conn->data;
|
---|
456 | CURLcode result = CURLE_OK;
|
---|
457 |
|
---|
458 | /* Set ascii mode if -B flag was used */
|
---|
459 | if(data->set.prefer_ascii)
|
---|
460 | mode = "netascii";
|
---|
461 |
|
---|
462 | switch(event) {
|
---|
463 |
|
---|
464 | case TFTP_EVENT_INIT: /* Send the first packet out */
|
---|
465 | case TFTP_EVENT_TIMEOUT: /* Resend the first packet out */
|
---|
466 | /* Increment the retry counter, quit if over the limit */
|
---|
467 | state->retries++;
|
---|
468 | if(state->retries>state->retry_max) {
|
---|
469 | state->error = TFTP_ERR_NORESPONSE;
|
---|
470 | state->state = TFTP_STATE_FIN;
|
---|
471 | return result;
|
---|
472 | }
|
---|
473 |
|
---|
474 | if(data->set.upload) {
|
---|
475 | /* If we are uploading, send an WRQ */
|
---|
476 | setpacketevent(&state->spacket, TFTP_EVENT_WRQ);
|
---|
477 | state->conn->data->req.upload_fromhere =
|
---|
478 | (char *)state->spacket.data + 4;
|
---|
479 | if(data->state.infilesize != -1)
|
---|
480 | Curl_pgrsSetUploadSize(data, data->state.infilesize);
|
---|
481 | }
|
---|
482 | else {
|
---|
483 | /* If we are downloading, send an RRQ */
|
---|
484 | setpacketevent(&state->spacket, TFTP_EVENT_RRQ);
|
---|
485 | }
|
---|
486 | /* As RFC3617 describes the separator slash is not actually part of the
|
---|
487 | file name so we skip the always-present first letter of the path
|
---|
488 | string. */
|
---|
489 | result = Curl_urldecode(data, &state->conn->data->state.path[1], 0,
|
---|
490 | &filename, NULL, FALSE);
|
---|
491 | if(result)
|
---|
492 | return result;
|
---|
493 |
|
---|
494 | if(strlen(filename) > (state->blksize - strlen(mode) - 4)) {
|
---|
495 | failf(data, "TFTP file name too long\n");
|
---|
496 | free(filename);
|
---|
497 | return CURLE_TFTP_ILLEGAL; /* too long file name field */
|
---|
498 | }
|
---|
499 |
|
---|
500 | snprintf((char *)state->spacket.data + 2,
|
---|
501 | state->blksize,
|
---|
502 | "%s%c%s%c", filename, '\0', mode, '\0');
|
---|
503 | sbytes = 4 + strlen(filename) + strlen(mode);
|
---|
504 |
|
---|
505 | /* optional addition of TFTP options */
|
---|
506 | if(!data->set.tftp_no_options) {
|
---|
507 | /* add tsize option */
|
---|
508 | if(data->set.upload && (data->state.infilesize != -1))
|
---|
509 | snprintf(buf, sizeof(buf), "%" CURL_FORMAT_CURL_OFF_T,
|
---|
510 | data->state.infilesize);
|
---|
511 | else
|
---|
512 | strcpy(buf, "0"); /* the destination is large enough */
|
---|
513 |
|
---|
514 | sbytes += tftp_option_add(state, sbytes,
|
---|
515 | (char *)state->spacket.data + sbytes,
|
---|
516 | TFTP_OPTION_TSIZE);
|
---|
517 | sbytes += tftp_option_add(state, sbytes,
|
---|
518 | (char *)state->spacket.data + sbytes, buf);
|
---|
519 | /* add blksize option */
|
---|
520 | snprintf(buf, sizeof(buf), "%d", state->requested_blksize);
|
---|
521 | sbytes += tftp_option_add(state, sbytes,
|
---|
522 | (char *)state->spacket.data + sbytes,
|
---|
523 | TFTP_OPTION_BLKSIZE);
|
---|
524 | sbytes += tftp_option_add(state, sbytes,
|
---|
525 | (char *)state->spacket.data + sbytes, buf);
|
---|
526 |
|
---|
527 | /* add timeout option */
|
---|
528 | snprintf(buf, sizeof(buf), "%d", state->retry_time);
|
---|
529 | sbytes += tftp_option_add(state, sbytes,
|
---|
530 | (char *)state->spacket.data + sbytes,
|
---|
531 | TFTP_OPTION_INTERVAL);
|
---|
532 | sbytes += tftp_option_add(state, sbytes,
|
---|
533 | (char *)state->spacket.data + sbytes, buf);
|
---|
534 | }
|
---|
535 |
|
---|
536 | /* the typecase for the 3rd argument is mostly for systems that do
|
---|
537 | not have a size_t argument, like older unixes that want an 'int' */
|
---|
538 | senddata = sendto(state->sockfd, (void *)state->spacket.data,
|
---|
539 | (SEND_TYPE_ARG3)sbytes, 0,
|
---|
540 | state->conn->ip_addr->ai_addr,
|
---|
541 | state->conn->ip_addr->ai_addrlen);
|
---|
542 | if(senddata != (ssize_t)sbytes) {
|
---|
543 | failf(data, "%s", Curl_strerror(state->conn, SOCKERRNO));
|
---|
544 | }
|
---|
545 | free(filename);
|
---|
546 | break;
|
---|
547 |
|
---|
548 | case TFTP_EVENT_OACK:
|
---|
549 | if(data->set.upload) {
|
---|
550 | result = tftp_connect_for_tx(state, event);
|
---|
551 | }
|
---|
552 | else {
|
---|
553 | result = tftp_connect_for_rx(state, event);
|
---|
554 | }
|
---|
555 | break;
|
---|
556 |
|
---|
557 | case TFTP_EVENT_ACK: /* Connected for transmit */
|
---|
558 | result = tftp_connect_for_tx(state, event);
|
---|
559 | break;
|
---|
560 |
|
---|
561 | case TFTP_EVENT_DATA: /* Connected for receive */
|
---|
562 | result = tftp_connect_for_rx(state, event);
|
---|
563 | break;
|
---|
564 |
|
---|
565 | case TFTP_EVENT_ERROR:
|
---|
566 | state->state = TFTP_STATE_FIN;
|
---|
567 | break;
|
---|
568 |
|
---|
569 | default:
|
---|
570 | failf(state->conn->data, "tftp_send_first: internal error");
|
---|
571 | break;
|
---|
572 | }
|
---|
573 |
|
---|
574 | return result;
|
---|
575 | }
|
---|
576 |
|
---|
577 | /* the next blocknum is x + 1 but it needs to wrap at an unsigned 16bit
|
---|
578 | boundary */
|
---|
579 | #define NEXT_BLOCKNUM(x) (((x) + 1)&0xffff)
|
---|
580 |
|
---|
581 | /**********************************************************
|
---|
582 | *
|
---|
583 | * tftp_rx
|
---|
584 | *
|
---|
585 | * Event handler for the RX state
|
---|
586 | *
|
---|
587 | **********************************************************/
|
---|
588 | static CURLcode tftp_rx(tftp_state_data_t *state, tftp_event_t event)
|
---|
589 | {
|
---|
590 | ssize_t sbytes;
|
---|
591 | int rblock;
|
---|
592 | struct Curl_easy *data = state->conn->data;
|
---|
593 |
|
---|
594 | switch(event) {
|
---|
595 |
|
---|
596 | case TFTP_EVENT_DATA:
|
---|
597 | /* Is this the block we expect? */
|
---|
598 | rblock = getrpacketblock(&state->rpacket);
|
---|
599 | if(NEXT_BLOCKNUM(state->block) == rblock) {
|
---|
600 | /* This is the expected block. Reset counters and ACK it. */
|
---|
601 | state->retries = 0;
|
---|
602 | }
|
---|
603 | else if(state->block == rblock) {
|
---|
604 | /* This is the last recently received block again. Log it and ACK it
|
---|
605 | again. */
|
---|
606 | infof(data, "Received last DATA packet block %d again.\n", rblock);
|
---|
607 | }
|
---|
608 | else {
|
---|
609 | /* totally unexpected, just log it */
|
---|
610 | infof(data,
|
---|
611 | "Received unexpected DATA packet block %d, expecting block %d\n",
|
---|
612 | rblock, NEXT_BLOCKNUM(state->block));
|
---|
613 | break;
|
---|
614 | }
|
---|
615 |
|
---|
616 | /* ACK this block. */
|
---|
617 | state->block = (unsigned short)rblock;
|
---|
618 | setpacketevent(&state->spacket, TFTP_EVENT_ACK);
|
---|
619 | setpacketblock(&state->spacket, state->block);
|
---|
620 | sbytes = sendto(state->sockfd, (void *)state->spacket.data,
|
---|
621 | 4, SEND_4TH_ARG,
|
---|
622 | (struct sockaddr *)&state->remote_addr,
|
---|
623 | state->remote_addrlen);
|
---|
624 | if(sbytes < 0) {
|
---|
625 | failf(data, "%s", Curl_strerror(state->conn, SOCKERRNO));
|
---|
626 | return CURLE_SEND_ERROR;
|
---|
627 | }
|
---|
628 |
|
---|
629 | /* Check if completed (That is, a less than full packet is received) */
|
---|
630 | if(state->rbytes < (ssize_t)state->blksize + 4) {
|
---|
631 | state->state = TFTP_STATE_FIN;
|
---|
632 | }
|
---|
633 | else {
|
---|
634 | state->state = TFTP_STATE_RX;
|
---|
635 | }
|
---|
636 | time(&state->rx_time);
|
---|
637 | break;
|
---|
638 |
|
---|
639 | case TFTP_EVENT_OACK:
|
---|
640 | /* ACK option acknowledgement so we can move on to data */
|
---|
641 | state->block = 0;
|
---|
642 | state->retries = 0;
|
---|
643 | setpacketevent(&state->spacket, TFTP_EVENT_ACK);
|
---|
644 | setpacketblock(&state->spacket, state->block);
|
---|
645 | sbytes = sendto(state->sockfd, (void *)state->spacket.data,
|
---|
646 | 4, SEND_4TH_ARG,
|
---|
647 | (struct sockaddr *)&state->remote_addr,
|
---|
648 | state->remote_addrlen);
|
---|
649 | if(sbytes < 0) {
|
---|
650 | failf(data, "%s", Curl_strerror(state->conn, SOCKERRNO));
|
---|
651 | return CURLE_SEND_ERROR;
|
---|
652 | }
|
---|
653 |
|
---|
654 | /* we're ready to RX data */
|
---|
655 | state->state = TFTP_STATE_RX;
|
---|
656 | time(&state->rx_time);
|
---|
657 | break;
|
---|
658 |
|
---|
659 | case TFTP_EVENT_TIMEOUT:
|
---|
660 | /* Increment the retry count and fail if over the limit */
|
---|
661 | state->retries++;
|
---|
662 | infof(data,
|
---|
663 | "Timeout waiting for block %d ACK. Retries = %d\n",
|
---|
664 | NEXT_BLOCKNUM(state->block), state->retries);
|
---|
665 | if(state->retries > state->retry_max) {
|
---|
666 | state->error = TFTP_ERR_TIMEOUT;
|
---|
667 | state->state = TFTP_STATE_FIN;
|
---|
668 | }
|
---|
669 | else {
|
---|
670 | /* Resend the previous ACK */
|
---|
671 | sbytes = sendto(state->sockfd, (void *)state->spacket.data,
|
---|
672 | 4, SEND_4TH_ARG,
|
---|
673 | (struct sockaddr *)&state->remote_addr,
|
---|
674 | state->remote_addrlen);
|
---|
675 | if(sbytes<0) {
|
---|
676 | failf(data, "%s", Curl_strerror(state->conn, SOCKERRNO));
|
---|
677 | return CURLE_SEND_ERROR;
|
---|
678 | }
|
---|
679 | }
|
---|
680 | break;
|
---|
681 |
|
---|
682 | case TFTP_EVENT_ERROR:
|
---|
683 | setpacketevent(&state->spacket, TFTP_EVENT_ERROR);
|
---|
684 | setpacketblock(&state->spacket, state->block);
|
---|
685 | (void)sendto(state->sockfd, (void *)state->spacket.data,
|
---|
686 | 4, SEND_4TH_ARG,
|
---|
687 | (struct sockaddr *)&state->remote_addr,
|
---|
688 | state->remote_addrlen);
|
---|
689 | /* don't bother with the return code, but if the socket is still up we
|
---|
690 | * should be a good TFTP client and let the server know we're done */
|
---|
691 | state->state = TFTP_STATE_FIN;
|
---|
692 | break;
|
---|
693 |
|
---|
694 | default:
|
---|
695 | failf(data, "%s", "tftp_rx: internal error");
|
---|
696 | return CURLE_TFTP_ILLEGAL; /* not really the perfect return code for
|
---|
697 | this */
|
---|
698 | }
|
---|
699 | return CURLE_OK;
|
---|
700 | }
|
---|
701 |
|
---|
702 | /**********************************************************
|
---|
703 | *
|
---|
704 | * tftp_tx
|
---|
705 | *
|
---|
706 | * Event handler for the TX state
|
---|
707 | *
|
---|
708 | **********************************************************/
|
---|
709 | static CURLcode tftp_tx(tftp_state_data_t *state, tftp_event_t event)
|
---|
710 | {
|
---|
711 | struct Curl_easy *data = state->conn->data;
|
---|
712 | ssize_t sbytes;
|
---|
713 | int rblock;
|
---|
714 | CURLcode result = CURLE_OK;
|
---|
715 | struct SingleRequest *k = &data->req;
|
---|
716 | int cb; /* Bytes currently read */
|
---|
717 |
|
---|
718 | switch(event) {
|
---|
719 |
|
---|
720 | case TFTP_EVENT_ACK:
|
---|
721 | case TFTP_EVENT_OACK:
|
---|
722 | if(event == TFTP_EVENT_ACK) {
|
---|
723 | /* Ack the packet */
|
---|
724 | rblock = getrpacketblock(&state->rpacket);
|
---|
725 |
|
---|
726 | if(rblock != state->block &&
|
---|
727 | /* There's a bug in tftpd-hpa that causes it to send us an ack for
|
---|
728 | * 65535 when the block number wraps to 0. So when we're expecting
|
---|
729 | * 0, also accept 65535. See
|
---|
730 | * http://syslinux.zytor.com/archives/2010-September/015253.html
|
---|
731 | * */
|
---|
732 | !(state->block == 0 && rblock == 65535)) {
|
---|
733 | /* This isn't the expected block. Log it and up the retry counter */
|
---|
734 | infof(data, "Received ACK for block %d, expecting %d\n",
|
---|
735 | rblock, state->block);
|
---|
736 | state->retries++;
|
---|
737 | /* Bail out if over the maximum */
|
---|
738 | if(state->retries>state->retry_max) {
|
---|
739 | failf(data, "tftp_tx: giving up waiting for block %d ack",
|
---|
740 | state->block);
|
---|
741 | result = CURLE_SEND_ERROR;
|
---|
742 | }
|
---|
743 | else {
|
---|
744 | /* Re-send the data packet */
|
---|
745 | sbytes = sendto(state->sockfd, (void *)state->spacket.data,
|
---|
746 | 4 + state->sbytes, SEND_4TH_ARG,
|
---|
747 | (struct sockaddr *)&state->remote_addr,
|
---|
748 | state->remote_addrlen);
|
---|
749 | /* Check all sbytes were sent */
|
---|
750 | if(sbytes<0) {
|
---|
751 | failf(data, "%s", Curl_strerror(state->conn, SOCKERRNO));
|
---|
752 | result = CURLE_SEND_ERROR;
|
---|
753 | }
|
---|
754 | }
|
---|
755 |
|
---|
756 | return result;
|
---|
757 | }
|
---|
758 | /* This is the expected packet. Reset the counters and send the next
|
---|
759 | block */
|
---|
760 | time(&state->rx_time);
|
---|
761 | state->block++;
|
---|
762 | }
|
---|
763 | else
|
---|
764 | state->block = 1; /* first data block is 1 when using OACK */
|
---|
765 |
|
---|
766 | state->retries = 0;
|
---|
767 | setpacketevent(&state->spacket, TFTP_EVENT_DATA);
|
---|
768 | setpacketblock(&state->spacket, state->block);
|
---|
769 | if(state->block > 1 && state->sbytes < (int)state->blksize) {
|
---|
770 | state->state = TFTP_STATE_FIN;
|
---|
771 | return CURLE_OK;
|
---|
772 | }
|
---|
773 |
|
---|
774 | /* TFTP considers data block size < 512 bytes as an end of session. So
|
---|
775 | * in some cases we must wait for additional data to build full (512 bytes)
|
---|
776 | * data block.
|
---|
777 | * */
|
---|
778 | state->sbytes = 0;
|
---|
779 | state->conn->data->req.upload_fromhere = (char *)state->spacket.data + 4;
|
---|
780 | do {
|
---|
781 | result = Curl_fillreadbuffer(state->conn, state->blksize - state->sbytes,
|
---|
782 | &cb);
|
---|
783 | if(result)
|
---|
784 | return result;
|
---|
785 | state->sbytes += cb;
|
---|
786 | state->conn->data->req.upload_fromhere += cb;
|
---|
787 | } while(state->sbytes < state->blksize && cb != 0);
|
---|
788 |
|
---|
789 | sbytes = sendto(state->sockfd, (void *) state->spacket.data,
|
---|
790 | 4 + state->sbytes, SEND_4TH_ARG,
|
---|
791 | (struct sockaddr *)&state->remote_addr,
|
---|
792 | state->remote_addrlen);
|
---|
793 | /* Check all sbytes were sent */
|
---|
794 | if(sbytes<0) {
|
---|
795 | failf(data, "%s", Curl_strerror(state->conn, SOCKERRNO));
|
---|
796 | return CURLE_SEND_ERROR;
|
---|
797 | }
|
---|
798 | /* Update the progress meter */
|
---|
799 | k->writebytecount += state->sbytes;
|
---|
800 | Curl_pgrsSetUploadCounter(data, k->writebytecount);
|
---|
801 | break;
|
---|
802 |
|
---|
803 | case TFTP_EVENT_TIMEOUT:
|
---|
804 | /* Increment the retry counter and log the timeout */
|
---|
805 | state->retries++;
|
---|
806 | infof(data, "Timeout waiting for block %d ACK. "
|
---|
807 | " Retries = %d\n", NEXT_BLOCKNUM(state->block), state->retries);
|
---|
808 | /* Decide if we've had enough */
|
---|
809 | if(state->retries > state->retry_max) {
|
---|
810 | state->error = TFTP_ERR_TIMEOUT;
|
---|
811 | state->state = TFTP_STATE_FIN;
|
---|
812 | }
|
---|
813 | else {
|
---|
814 | /* Re-send the data packet */
|
---|
815 | sbytes = sendto(state->sockfd, (void *)state->spacket.data,
|
---|
816 | 4 + state->sbytes, SEND_4TH_ARG,
|
---|
817 | (struct sockaddr *)&state->remote_addr,
|
---|
818 | state->remote_addrlen);
|
---|
819 | /* Check all sbytes were sent */
|
---|
820 | if(sbytes<0) {
|
---|
821 | failf(data, "%s", Curl_strerror(state->conn, SOCKERRNO));
|
---|
822 | return CURLE_SEND_ERROR;
|
---|
823 | }
|
---|
824 | /* since this was a re-send, we remain at the still byte position */
|
---|
825 | Curl_pgrsSetUploadCounter(data, k->writebytecount);
|
---|
826 | }
|
---|
827 | break;
|
---|
828 |
|
---|
829 | case TFTP_EVENT_ERROR:
|
---|
830 | state->state = TFTP_STATE_FIN;
|
---|
831 | setpacketevent(&state->spacket, TFTP_EVENT_ERROR);
|
---|
832 | setpacketblock(&state->spacket, state->block);
|
---|
833 | (void)sendto(state->sockfd, (void *)state->spacket.data, 4, SEND_4TH_ARG,
|
---|
834 | (struct sockaddr *)&state->remote_addr,
|
---|
835 | state->remote_addrlen);
|
---|
836 | /* don't bother with the return code, but if the socket is still up we
|
---|
837 | * should be a good TFTP client and let the server know we're done */
|
---|
838 | state->state = TFTP_STATE_FIN;
|
---|
839 | break;
|
---|
840 |
|
---|
841 | default:
|
---|
842 | failf(data, "tftp_tx: internal error, event: %i", (int)(event));
|
---|
843 | break;
|
---|
844 | }
|
---|
845 |
|
---|
846 | return result;
|
---|
847 | }
|
---|
848 |
|
---|
849 | /**********************************************************
|
---|
850 | *
|
---|
851 | * tftp_translate_code
|
---|
852 | *
|
---|
853 | * Translate internal error codes to CURL error codes
|
---|
854 | *
|
---|
855 | **********************************************************/
|
---|
856 | static CURLcode tftp_translate_code(tftp_error_t error)
|
---|
857 | {
|
---|
858 | CURLcode result = CURLE_OK;
|
---|
859 |
|
---|
860 | if(error != TFTP_ERR_NONE) {
|
---|
861 | switch(error) {
|
---|
862 | case TFTP_ERR_NOTFOUND:
|
---|
863 | result = CURLE_TFTP_NOTFOUND;
|
---|
864 | break;
|
---|
865 | case TFTP_ERR_PERM:
|
---|
866 | result = CURLE_TFTP_PERM;
|
---|
867 | break;
|
---|
868 | case TFTP_ERR_DISKFULL:
|
---|
869 | result = CURLE_REMOTE_DISK_FULL;
|
---|
870 | break;
|
---|
871 | case TFTP_ERR_UNDEF:
|
---|
872 | case TFTP_ERR_ILLEGAL:
|
---|
873 | result = CURLE_TFTP_ILLEGAL;
|
---|
874 | break;
|
---|
875 | case TFTP_ERR_UNKNOWNID:
|
---|
876 | result = CURLE_TFTP_UNKNOWNID;
|
---|
877 | break;
|
---|
878 | case TFTP_ERR_EXISTS:
|
---|
879 | result = CURLE_REMOTE_FILE_EXISTS;
|
---|
880 | break;
|
---|
881 | case TFTP_ERR_NOSUCHUSER:
|
---|
882 | result = CURLE_TFTP_NOSUCHUSER;
|
---|
883 | break;
|
---|
884 | case TFTP_ERR_TIMEOUT:
|
---|
885 | result = CURLE_OPERATION_TIMEDOUT;
|
---|
886 | break;
|
---|
887 | case TFTP_ERR_NORESPONSE:
|
---|
888 | result = CURLE_COULDNT_CONNECT;
|
---|
889 | break;
|
---|
890 | default:
|
---|
891 | result = CURLE_ABORTED_BY_CALLBACK;
|
---|
892 | break;
|
---|
893 | }
|
---|
894 | }
|
---|
895 | else
|
---|
896 | result = CURLE_OK;
|
---|
897 |
|
---|
898 | return result;
|
---|
899 | }
|
---|
900 |
|
---|
901 | /**********************************************************
|
---|
902 | *
|
---|
903 | * tftp_state_machine
|
---|
904 | *
|
---|
905 | * The tftp state machine event dispatcher
|
---|
906 | *
|
---|
907 | **********************************************************/
|
---|
908 | static CURLcode tftp_state_machine(tftp_state_data_t *state,
|
---|
909 | tftp_event_t event)
|
---|
910 | {
|
---|
911 | CURLcode result = CURLE_OK;
|
---|
912 | struct Curl_easy *data = state->conn->data;
|
---|
913 |
|
---|
914 | switch(state->state) {
|
---|
915 | case TFTP_STATE_START:
|
---|
916 | DEBUGF(infof(data, "TFTP_STATE_START\n"));
|
---|
917 | result = tftp_send_first(state, event);
|
---|
918 | break;
|
---|
919 | case TFTP_STATE_RX:
|
---|
920 | DEBUGF(infof(data, "TFTP_STATE_RX\n"));
|
---|
921 | result = tftp_rx(state, event);
|
---|
922 | break;
|
---|
923 | case TFTP_STATE_TX:
|
---|
924 | DEBUGF(infof(data, "TFTP_STATE_TX\n"));
|
---|
925 | result = tftp_tx(state, event);
|
---|
926 | break;
|
---|
927 | case TFTP_STATE_FIN:
|
---|
928 | infof(data, "%s\n", "TFTP finished");
|
---|
929 | break;
|
---|
930 | default:
|
---|
931 | DEBUGF(infof(data, "STATE: %d\n", state->state));
|
---|
932 | failf(data, "%s", "Internal state machine error");
|
---|
933 | result = CURLE_TFTP_ILLEGAL;
|
---|
934 | break;
|
---|
935 | }
|
---|
936 |
|
---|
937 | return result;
|
---|
938 | }
|
---|
939 |
|
---|
940 | /**********************************************************
|
---|
941 | *
|
---|
942 | * tftp_disconnect
|
---|
943 | *
|
---|
944 | * The disconnect callback
|
---|
945 | *
|
---|
946 | **********************************************************/
|
---|
947 | static CURLcode tftp_disconnect(struct connectdata *conn, bool dead_connection)
|
---|
948 | {
|
---|
949 | tftp_state_data_t *state = conn->proto.tftpc;
|
---|
950 | (void) dead_connection;
|
---|
951 |
|
---|
952 | /* done, free dynamically allocated pkt buffers */
|
---|
953 | if(state) {
|
---|
954 | Curl_safefree(state->rpacket.data);
|
---|
955 | Curl_safefree(state->spacket.data);
|
---|
956 | free(state);
|
---|
957 | }
|
---|
958 |
|
---|
959 | return CURLE_OK;
|
---|
960 | }
|
---|
961 |
|
---|
962 | /**********************************************************
|
---|
963 | *
|
---|
964 | * tftp_connect
|
---|
965 | *
|
---|
966 | * The connect callback
|
---|
967 | *
|
---|
968 | **********************************************************/
|
---|
969 | static CURLcode tftp_connect(struct connectdata *conn, bool *done)
|
---|
970 | {
|
---|
971 | tftp_state_data_t *state;
|
---|
972 | int blksize, rc;
|
---|
973 |
|
---|
974 | blksize = TFTP_BLKSIZE_DEFAULT;
|
---|
975 |
|
---|
976 | state = conn->proto.tftpc = calloc(1, sizeof(tftp_state_data_t));
|
---|
977 | if(!state)
|
---|
978 | return CURLE_OUT_OF_MEMORY;
|
---|
979 |
|
---|
980 | /* alloc pkt buffers based on specified blksize */
|
---|
981 | if(conn->data->set.tftp_blksize) {
|
---|
982 | blksize = (int)conn->data->set.tftp_blksize;
|
---|
983 | if(blksize > TFTP_BLKSIZE_MAX || blksize < TFTP_BLKSIZE_MIN)
|
---|
984 | return CURLE_TFTP_ILLEGAL;
|
---|
985 | }
|
---|
986 |
|
---|
987 | if(!state->rpacket.data) {
|
---|
988 | state->rpacket.data = calloc(1, blksize + 2 + 2);
|
---|
989 |
|
---|
990 | if(!state->rpacket.data)
|
---|
991 | return CURLE_OUT_OF_MEMORY;
|
---|
992 | }
|
---|
993 |
|
---|
994 | if(!state->spacket.data) {
|
---|
995 | state->spacket.data = calloc(1, blksize + 2 + 2);
|
---|
996 |
|
---|
997 | if(!state->spacket.data)
|
---|
998 | return CURLE_OUT_OF_MEMORY;
|
---|
999 | }
|
---|
1000 |
|
---|
1001 | /* we don't keep TFTP connections up basically because there's none or very
|
---|
1002 | * little gain for UDP */
|
---|
1003 | connclose(conn, "TFTP");
|
---|
1004 |
|
---|
1005 | state->conn = conn;
|
---|
1006 | state->sockfd = state->conn->sock[FIRSTSOCKET];
|
---|
1007 | state->state = TFTP_STATE_START;
|
---|
1008 | state->error = TFTP_ERR_NONE;
|
---|
1009 | state->blksize = TFTP_BLKSIZE_DEFAULT;
|
---|
1010 | state->requested_blksize = blksize;
|
---|
1011 |
|
---|
1012 | ((struct sockaddr *)&state->local_addr)->sa_family =
|
---|
1013 | (unsigned short)(conn->ip_addr->ai_family);
|
---|
1014 |
|
---|
1015 | tftp_set_timeouts(state);
|
---|
1016 |
|
---|
1017 | if(!conn->bits.bound) {
|
---|
1018 | /* If not already bound, bind to any interface, random UDP port. If it is
|
---|
1019 | * reused or a custom local port was desired, this has already been done!
|
---|
1020 | *
|
---|
1021 | * We once used the size of the local_addr struct as the third argument
|
---|
1022 | * for bind() to better work with IPv6 or whatever size the struct could
|
---|
1023 | * have, but we learned that at least Tru64, AIX and IRIX *requires* the
|
---|
1024 | * size of that argument to match the exact size of a 'sockaddr_in' struct
|
---|
1025 | * when running IPv4-only.
|
---|
1026 | *
|
---|
1027 | * Therefore we use the size from the address we connected to, which we
|
---|
1028 | * assume uses the same IP version and thus hopefully this works for both
|
---|
1029 | * IPv4 and IPv6...
|
---|
1030 | */
|
---|
1031 | rc = bind(state->sockfd, (struct sockaddr *)&state->local_addr,
|
---|
1032 | conn->ip_addr->ai_addrlen);
|
---|
1033 | if(rc) {
|
---|
1034 | failf(conn->data, "bind() failed; %s",
|
---|
1035 | Curl_strerror(conn, SOCKERRNO));
|
---|
1036 | return CURLE_COULDNT_CONNECT;
|
---|
1037 | }
|
---|
1038 | conn->bits.bound = TRUE;
|
---|
1039 | }
|
---|
1040 |
|
---|
1041 | Curl_pgrsStartNow(conn->data);
|
---|
1042 |
|
---|
1043 | *done = TRUE;
|
---|
1044 |
|
---|
1045 | return CURLE_OK;
|
---|
1046 | }
|
---|
1047 |
|
---|
1048 | /**********************************************************
|
---|
1049 | *
|
---|
1050 | * tftp_done
|
---|
1051 | *
|
---|
1052 | * The done callback
|
---|
1053 | *
|
---|
1054 | **********************************************************/
|
---|
1055 | static CURLcode tftp_done(struct connectdata *conn, CURLcode status,
|
---|
1056 | bool premature)
|
---|
1057 | {
|
---|
1058 | CURLcode result = CURLE_OK;
|
---|
1059 | tftp_state_data_t *state = (tftp_state_data_t *)conn->proto.tftpc;
|
---|
1060 |
|
---|
1061 | (void)status; /* unused */
|
---|
1062 | (void)premature; /* not used */
|
---|
1063 |
|
---|
1064 | if(Curl_pgrsDone(conn))
|
---|
1065 | return CURLE_ABORTED_BY_CALLBACK;
|
---|
1066 |
|
---|
1067 | /* If we have encountered an error */
|
---|
1068 | if(state)
|
---|
1069 | result = tftp_translate_code(state->error);
|
---|
1070 |
|
---|
1071 | return result;
|
---|
1072 | }
|
---|
1073 |
|
---|
1074 | /**********************************************************
|
---|
1075 | *
|
---|
1076 | * tftp_getsock
|
---|
1077 | *
|
---|
1078 | * The getsock callback
|
---|
1079 | *
|
---|
1080 | **********************************************************/
|
---|
1081 | static int tftp_getsock(struct connectdata *conn, curl_socket_t *socks,
|
---|
1082 | int numsocks)
|
---|
1083 | {
|
---|
1084 | if(!numsocks)
|
---|
1085 | return GETSOCK_BLANK;
|
---|
1086 |
|
---|
1087 | socks[0] = conn->sock[FIRSTSOCKET];
|
---|
1088 |
|
---|
1089 | return GETSOCK_READSOCK(0);
|
---|
1090 | }
|
---|
1091 |
|
---|
1092 | /**********************************************************
|
---|
1093 | *
|
---|
1094 | * tftp_receive_packet
|
---|
1095 | *
|
---|
1096 | * Called once select fires and data is ready on the socket
|
---|
1097 | *
|
---|
1098 | **********************************************************/
|
---|
1099 | static CURLcode tftp_receive_packet(struct connectdata *conn)
|
---|
1100 | {
|
---|
1101 | struct Curl_sockaddr_storage fromaddr;
|
---|
1102 | curl_socklen_t fromlen;
|
---|
1103 | CURLcode result = CURLE_OK;
|
---|
1104 | struct Curl_easy *data = conn->data;
|
---|
1105 | tftp_state_data_t *state = (tftp_state_data_t *)conn->proto.tftpc;
|
---|
1106 | struct SingleRequest *k = &data->req;
|
---|
1107 |
|
---|
1108 | /* Receive the packet */
|
---|
1109 | fromlen = sizeof(fromaddr);
|
---|
1110 | state->rbytes = (int)recvfrom(state->sockfd,
|
---|
1111 | (void *)state->rpacket.data,
|
---|
1112 | state->blksize + 4,
|
---|
1113 | 0,
|
---|
1114 | (struct sockaddr *)&fromaddr,
|
---|
1115 | &fromlen);
|
---|
1116 | if(state->remote_addrlen == 0) {
|
---|
1117 | memcpy(&state->remote_addr, &fromaddr, fromlen);
|
---|
1118 | state->remote_addrlen = fromlen;
|
---|
1119 | }
|
---|
1120 |
|
---|
1121 | /* Sanity check packet length */
|
---|
1122 | if(state->rbytes < 4) {
|
---|
1123 | failf(data, "Received too short packet");
|
---|
1124 | /* Not a timeout, but how best to handle it? */
|
---|
1125 | state->event = TFTP_EVENT_TIMEOUT;
|
---|
1126 | }
|
---|
1127 | else {
|
---|
1128 | /* The event is given by the TFTP packet time */
|
---|
1129 | unsigned short event = getrpacketevent(&state->rpacket);
|
---|
1130 | state->event = (tftp_event_t)event;
|
---|
1131 |
|
---|
1132 | switch(state->event) {
|
---|
1133 | case TFTP_EVENT_DATA:
|
---|
1134 | /* Don't pass to the client empty or retransmitted packets */
|
---|
1135 | if(state->rbytes > 4 &&
|
---|
1136 | (NEXT_BLOCKNUM(state->block) == getrpacketblock(&state->rpacket))) {
|
---|
1137 | result = Curl_client_write(conn, CLIENTWRITE_BODY,
|
---|
1138 | (char *)state->rpacket.data + 4,
|
---|
1139 | state->rbytes-4);
|
---|
1140 | if(result) {
|
---|
1141 | tftp_state_machine(state, TFTP_EVENT_ERROR);
|
---|
1142 | return result;
|
---|
1143 | }
|
---|
1144 | k->bytecount += state->rbytes-4;
|
---|
1145 | Curl_pgrsSetDownloadCounter(data, (curl_off_t) k->bytecount);
|
---|
1146 | }
|
---|
1147 | break;
|
---|
1148 | case TFTP_EVENT_ERROR:
|
---|
1149 | {
|
---|
1150 | unsigned short error = getrpacketblock(&state->rpacket);
|
---|
1151 | state->error = (tftp_error_t)error;
|
---|
1152 | infof(data, "%s\n", (const char *)state->rpacket.data + 4);
|
---|
1153 | break;
|
---|
1154 | }
|
---|
1155 | case TFTP_EVENT_ACK:
|
---|
1156 | break;
|
---|
1157 | case TFTP_EVENT_OACK:
|
---|
1158 | result = tftp_parse_option_ack(state,
|
---|
1159 | (const char *)state->rpacket.data + 2,
|
---|
1160 | state->rbytes-2);
|
---|
1161 | if(result)
|
---|
1162 | return result;
|
---|
1163 | break;
|
---|
1164 | case TFTP_EVENT_RRQ:
|
---|
1165 | case TFTP_EVENT_WRQ:
|
---|
1166 | default:
|
---|
1167 | failf(data, "%s", "Internal error: Unexpected packet");
|
---|
1168 | break;
|
---|
1169 | }
|
---|
1170 |
|
---|
1171 | /* Update the progress meter */
|
---|
1172 | if(Curl_pgrsUpdate(conn)) {
|
---|
1173 | tftp_state_machine(state, TFTP_EVENT_ERROR);
|
---|
1174 | return CURLE_ABORTED_BY_CALLBACK;
|
---|
1175 | }
|
---|
1176 | }
|
---|
1177 | return result;
|
---|
1178 | }
|
---|
1179 |
|
---|
1180 | /**********************************************************
|
---|
1181 | *
|
---|
1182 | * tftp_state_timeout
|
---|
1183 | *
|
---|
1184 | * Check if timeouts have been reached
|
---|
1185 | *
|
---|
1186 | **********************************************************/
|
---|
1187 | static long tftp_state_timeout(struct connectdata *conn, tftp_event_t *event)
|
---|
1188 | {
|
---|
1189 | time_t current;
|
---|
1190 | tftp_state_data_t *state = (tftp_state_data_t *)conn->proto.tftpc;
|
---|
1191 |
|
---|
1192 | if(event)
|
---|
1193 | *event = TFTP_EVENT_NONE;
|
---|
1194 |
|
---|
1195 | time(¤t);
|
---|
1196 | if(current > state->max_time) {
|
---|
1197 | DEBUGF(infof(conn->data, "timeout: %ld > %ld\n",
|
---|
1198 | (long)current, (long)state->max_time));
|
---|
1199 | state->error = TFTP_ERR_TIMEOUT;
|
---|
1200 | state->state = TFTP_STATE_FIN;
|
---|
1201 | return 0;
|
---|
1202 | }
|
---|
1203 | if(current > state->rx_time + state->retry_time) {
|
---|
1204 | if(event)
|
---|
1205 | *event = TFTP_EVENT_TIMEOUT;
|
---|
1206 | time(&state->rx_time); /* update even though we received nothing */
|
---|
1207 | }
|
---|
1208 |
|
---|
1209 | /* there's a typecast below here since 'time_t' may in fact be larger than
|
---|
1210 | 'long', but we estimate that a 'long' will still be able to hold number
|
---|
1211 | of seconds even if "only" 32 bit */
|
---|
1212 | return (long)(state->max_time - current);
|
---|
1213 | }
|
---|
1214 |
|
---|
1215 | /**********************************************************
|
---|
1216 | *
|
---|
1217 | * tftp_multi_statemach
|
---|
1218 | *
|
---|
1219 | * Handle single RX socket event and return
|
---|
1220 | *
|
---|
1221 | **********************************************************/
|
---|
1222 | static CURLcode tftp_multi_statemach(struct connectdata *conn, bool *done)
|
---|
1223 | {
|
---|
1224 | int rc;
|
---|
1225 | tftp_event_t event;
|
---|
1226 | CURLcode result = CURLE_OK;
|
---|
1227 | struct Curl_easy *data = conn->data;
|
---|
1228 | tftp_state_data_t *state = (tftp_state_data_t *)conn->proto.tftpc;
|
---|
1229 | long timeout_ms = tftp_state_timeout(conn, &event);
|
---|
1230 |
|
---|
1231 | *done = FALSE;
|
---|
1232 |
|
---|
1233 | if(timeout_ms <= 0) {
|
---|
1234 | failf(data, "TFTP response timeout");
|
---|
1235 | return CURLE_OPERATION_TIMEDOUT;
|
---|
1236 | }
|
---|
1237 | if(event != TFTP_EVENT_NONE) {
|
---|
1238 | result = tftp_state_machine(state, event);
|
---|
1239 | if(result)
|
---|
1240 | return result;
|
---|
1241 | *done = (state->state == TFTP_STATE_FIN) ? TRUE : FALSE;
|
---|
1242 | if(*done)
|
---|
1243 | /* Tell curl we're done */
|
---|
1244 | Curl_setup_transfer(conn, -1, -1, FALSE, NULL, -1, NULL);
|
---|
1245 | }
|
---|
1246 | else {
|
---|
1247 | /* no timeouts to handle, check our socket */
|
---|
1248 | rc = SOCKET_READABLE(state->sockfd, 0);
|
---|
1249 |
|
---|
1250 | if(rc == -1) {
|
---|
1251 | /* bail out */
|
---|
1252 | int error = SOCKERRNO;
|
---|
1253 | failf(data, "%s", Curl_strerror(conn, error));
|
---|
1254 | state->event = TFTP_EVENT_ERROR;
|
---|
1255 | }
|
---|
1256 | else if(rc != 0) {
|
---|
1257 | result = tftp_receive_packet(conn);
|
---|
1258 | if(result)
|
---|
1259 | return result;
|
---|
1260 | result = tftp_state_machine(state, state->event);
|
---|
1261 | if(result)
|
---|
1262 | return result;
|
---|
1263 | *done = (state->state == TFTP_STATE_FIN) ? TRUE : FALSE;
|
---|
1264 | if(*done)
|
---|
1265 | /* Tell curl we're done */
|
---|
1266 | Curl_setup_transfer(conn, -1, -1, FALSE, NULL, -1, NULL);
|
---|
1267 | }
|
---|
1268 | /* if rc == 0, then select() timed out */
|
---|
1269 | }
|
---|
1270 |
|
---|
1271 | return result;
|
---|
1272 | }
|
---|
1273 |
|
---|
1274 | /**********************************************************
|
---|
1275 | *
|
---|
1276 | * tftp_doing
|
---|
1277 | *
|
---|
1278 | * Called from multi.c while DOing
|
---|
1279 | *
|
---|
1280 | **********************************************************/
|
---|
1281 | static CURLcode tftp_doing(struct connectdata *conn, bool *dophase_done)
|
---|
1282 | {
|
---|
1283 | CURLcode result;
|
---|
1284 | result = tftp_multi_statemach(conn, dophase_done);
|
---|
1285 |
|
---|
1286 | if(*dophase_done) {
|
---|
1287 | DEBUGF(infof(conn->data, "DO phase is complete\n"));
|
---|
1288 | }
|
---|
1289 | else if(!result) {
|
---|
1290 | /* The multi code doesn't have this logic for the DOING state so we
|
---|
1291 | provide it for TFTP since it may do the entire transfer in this
|
---|
1292 | state. */
|
---|
1293 | if(Curl_pgrsUpdate(conn))
|
---|
1294 | result = CURLE_ABORTED_BY_CALLBACK;
|
---|
1295 | else
|
---|
1296 | result = Curl_speedcheck(conn->data, Curl_now());
|
---|
1297 | }
|
---|
1298 | return result;
|
---|
1299 | }
|
---|
1300 |
|
---|
1301 | /**********************************************************
|
---|
1302 | *
|
---|
1303 | * tftp_peform
|
---|
1304 | *
|
---|
1305 | * Entry point for transfer from tftp_do, sarts state mach
|
---|
1306 | *
|
---|
1307 | **********************************************************/
|
---|
1308 | static CURLcode tftp_perform(struct connectdata *conn, bool *dophase_done)
|
---|
1309 | {
|
---|
1310 | CURLcode result = CURLE_OK;
|
---|
1311 | tftp_state_data_t *state = (tftp_state_data_t *)conn->proto.tftpc;
|
---|
1312 |
|
---|
1313 | *dophase_done = FALSE;
|
---|
1314 |
|
---|
1315 | result = tftp_state_machine(state, TFTP_EVENT_INIT);
|
---|
1316 |
|
---|
1317 | if((state->state == TFTP_STATE_FIN) || result)
|
---|
1318 | return result;
|
---|
1319 |
|
---|
1320 | tftp_multi_statemach(conn, dophase_done);
|
---|
1321 |
|
---|
1322 | if(*dophase_done)
|
---|
1323 | DEBUGF(infof(conn->data, "DO phase is complete\n"));
|
---|
1324 |
|
---|
1325 | return result;
|
---|
1326 | }
|
---|
1327 |
|
---|
1328 |
|
---|
1329 | /**********************************************************
|
---|
1330 | *
|
---|
1331 | * tftp_do
|
---|
1332 | *
|
---|
1333 | * The do callback
|
---|
1334 | *
|
---|
1335 | * This callback initiates the TFTP transfer
|
---|
1336 | *
|
---|
1337 | **********************************************************/
|
---|
1338 |
|
---|
1339 | static CURLcode tftp_do(struct connectdata *conn, bool *done)
|
---|
1340 | {
|
---|
1341 | tftp_state_data_t *state;
|
---|
1342 | CURLcode result;
|
---|
1343 |
|
---|
1344 | *done = FALSE;
|
---|
1345 |
|
---|
1346 | if(!conn->proto.tftpc) {
|
---|
1347 | result = tftp_connect(conn, done);
|
---|
1348 | if(result)
|
---|
1349 | return result;
|
---|
1350 | }
|
---|
1351 |
|
---|
1352 | state = (tftp_state_data_t *)conn->proto.tftpc;
|
---|
1353 | if(!state)
|
---|
1354 | return CURLE_TFTP_ILLEGAL;
|
---|
1355 |
|
---|
1356 | result = tftp_perform(conn, done);
|
---|
1357 |
|
---|
1358 | /* If tftp_perform() returned an error, use that for return code. If it
|
---|
1359 | was OK, see if tftp_translate_code() has an error. */
|
---|
1360 | if(!result)
|
---|
1361 | /* If we have encountered an internal tftp error, translate it. */
|
---|
1362 | result = tftp_translate_code(state->error);
|
---|
1363 |
|
---|
1364 | return result;
|
---|
1365 | }
|
---|
1366 |
|
---|
1367 | static CURLcode tftp_setup_connection(struct connectdata * conn)
|
---|
1368 | {
|
---|
1369 | struct Curl_easy *data = conn->data;
|
---|
1370 | char *type;
|
---|
1371 | char command;
|
---|
1372 |
|
---|
1373 | conn->socktype = SOCK_DGRAM; /* UDP datagram based */
|
---|
1374 |
|
---|
1375 | /* TFTP URLs support an extension like ";mode=<typecode>" that
|
---|
1376 | * we'll try to get now! */
|
---|
1377 | type = strstr(data->state.path, ";mode=");
|
---|
1378 |
|
---|
1379 | if(!type)
|
---|
1380 | type = strstr(conn->host.rawalloc, ";mode=");
|
---|
1381 |
|
---|
1382 | if(type) {
|
---|
1383 | *type = 0; /* it was in the middle of the hostname */
|
---|
1384 | command = Curl_raw_toupper(type[6]);
|
---|
1385 |
|
---|
1386 | switch(command) {
|
---|
1387 | case 'A': /* ASCII mode */
|
---|
1388 | case 'N': /* NETASCII mode */
|
---|
1389 | data->set.prefer_ascii = TRUE;
|
---|
1390 | break;
|
---|
1391 |
|
---|
1392 | case 'O': /* octet mode */
|
---|
1393 | case 'I': /* binary mode */
|
---|
1394 | default:
|
---|
1395 | /* switch off ASCII */
|
---|
1396 | data->set.prefer_ascii = FALSE;
|
---|
1397 | break;
|
---|
1398 | }
|
---|
1399 | }
|
---|
1400 |
|
---|
1401 | return CURLE_OK;
|
---|
1402 | }
|
---|
1403 | #endif
|
---|