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annotate packages/net/tcpip/current/src/lib/tftp_server.c @ 97:ced4577552cd ecos-sw-2000-06-06

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Merge from eCos master repository on 2000-06-06-08:44:00-BST
author jlarmour
date Tue, 06 Jun 2000 08:39:36 +0000
parents
children 02ea4320376c
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97
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1 //==========================================================================
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2 //
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3 // lib/tftp_server.c
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4 //
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5 // TFTP server support
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6 //
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7 //==========================================================================
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8 //####COPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.1 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://www.redhat.com/
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15 //
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16 // Software distributed under the License is distributed on an "AS IS"
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //####BSDCOPYRIGHTBEGIN####
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32 //
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33 // -------------------------------------------
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34 //
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35 // Portions of this software may have been derived from OpenBSD or other sources,
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36 // and are covered by the appropriate copyright disclaimers included herein.
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37 //
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38 // -------------------------------------------
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39 //
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40 //####BSDCOPYRIGHTEND####
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41 //==========================================================================
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42 //#####DESCRIPTIONBEGIN####
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43 //
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44 // Author(s): gthomas
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45 // Contributors: gthomas
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46 // Date: 2000-04-06
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47 // Purpose:
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48 // Description:
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49 //
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50 //
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51 //####DESCRIPTIONEND####
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52 //
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53 //==========================================================================
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54
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55 // TFTP server support
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56
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57 #include <network.h> // Basic networking support
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58 #include <arpa/tftp.h> // TFTP protocol definitions
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59 #include <tftp_support.h> // TFTPD structures
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60 #include <cyg/kernel/kapi.h>
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61 #include <stdlib.h> // For malloc
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62
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63 #define STACK_SIZE (CYGNUM_HAL_STACK_SIZE_TYPICAL+(3*(SEGSIZE+sizeof(struct tftphdr))))
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64 static char *TFTP_tag = "TFTPD";
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65 struct tftp_server {
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66 char *tag;
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67 char stack[STACK_SIZE];
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68 cyg_thread thread_data;
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69 cyg_handle_t thread_handle;
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70 int port;
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71 struct tftpd_fileops *ops;
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72 };
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73
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74 //
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75 // Receive a file from the client
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76 //
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77 static void
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78 tftpd_write_file(struct tftp_server *server,
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79 struct tftphdr *hdr,
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80 struct sockaddr_in *from_addr, int from_len)
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81 {
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82 char data_out[SEGSIZE+sizeof(struct tftphdr)];
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83 char data_in[SEGSIZE+sizeof(struct tftphdr)];
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84 struct tftphdr *reply = (struct tftphdr *)data_out;
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85 struct tftphdr *response = (struct tftphdr *)data_in;
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86 int fd, block, len, ok, data_len, s;
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87 struct timeval timeout;
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88 fd_set fds;
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89 int total_timeouts = 0;
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90 struct sockaddr_in client_addr, local_addr;
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91 int client_len;
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92
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93 s = socket(AF_INET, SOCK_DGRAM, 0);
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94 if (s < 0) {
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95 diag_printf("TFTPD: can't open socket for 'write_file'\n");
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96 return;
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97 }
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98 memset((char *)&local_addr, 0, sizeof(local_addr));
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99 local_addr.sin_family = AF_INET;
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100 local_addr.sin_addr.s_addr = htonl(INADDR_ANY);
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101 local_addr.sin_port = htons(INADDR_ANY);
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102 if (bind(s, (struct sockaddr *)&local_addr, sizeof(local_addr)) < 0) {
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103 // Problem setting up my end
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104 diag_printf("TFTPD: can't bind to reply port for 'write_file'\n");
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105 close(s);
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106 return;
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107 }
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108 if ((fd = (server->ops->open)(hdr->th_stuff, O_WRONLY)) < 0) {
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109 reply->th_opcode = htons(ERROR);
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110 reply->th_code = htons(ENOTFOUND);
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111 strcpy(reply->th_msg, "Can't open file");
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112 sendto(s, reply, 4+strlen(reply->th_msg)+1, 0,
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113 (struct sockaddr *)from_addr, from_len);
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114 close(s);
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115 return;
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116 }
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117 // Send ACK telling client he can send data
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118 reply->th_opcode = htons(ACK);
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119 reply->th_block = 0;
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120 sendto(s, reply, 4, 0, (struct sockaddr *)from_addr, from_len);
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121 block = 1;
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122 ok = true;
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123 while (ok) {
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124 timeout.tv_sec = TFTP_TIMEOUT_PERIOD;
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125 timeout.tv_usec = 0;
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126 FD_ZERO(&fds);
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127 FD_SET(s, &fds);
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128 if (select(s+1, &fds, 0, 0, &timeout) <= 0) {
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129 if (++total_timeouts > TFTP_TIMEOUT_MAX) {
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130 ok = false;
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131 break;
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132 }
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133 // Try resending last ACK
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134 sendto(s, reply, 4, 0, (struct sockaddr *)from_addr, from_len);
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135 } else {
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136 // Some data has arrived
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137 data_len = sizeof(data_in);
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138 client_len = sizeof(client_addr);
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139 if ((data_len = recvfrom(s, data_in, data_len, 0,
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140 (struct sockaddr *)&client_addr, &client_len)) < 0) {
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141 // What happened?
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142 diag_printf("Can't read client data!\n");
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143 ok = false;
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144 break;
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145 }
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146 if (ntohs(response->th_opcode) == DATA) {
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147 if (ntohs(response->th_block) == block) {
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148 // Good data - write to file
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149 len = (server->ops->write)(fd, response->th_data, data_len-4);
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150 if (len < (data_len-4)) {
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151 // File is "full"
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152 reply->th_opcode = htons(ERROR);
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153 reply->th_code = htons(TFTP_ENOSPACE);
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154 ok = false; // Give up
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155 } else {
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156 reply->th_opcode = htons(ACK);
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157 reply->th_block = htons(block++);
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158 }
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159 sendto(s, reply, 4, 0, (struct sockaddr *)from_addr, from_len);
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160 if (data_len < (SEGSIZE+4)) {
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161 // End of file
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162 ok = false;
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163 }
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164 } else {
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165 // Something is wrong - tell client last good block
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166 sendto(s, reply, 4, 0, (struct sockaddr *)from_addr, from_len);
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167 }
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168 } else {
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169 // Client has sent something bogus - bag out!
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170 reply->th_opcode = htons(ERROR);
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171 reply->th_code = htons(TFTP_EBADOP);
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172 sendto(s, reply, 4, 0, (struct sockaddr *)from_addr, from_len);
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173 ok = false;
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174 }
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175 }
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176 }
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177 close(s);
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178 (server->ops->close)(fd);
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179 }
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180
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181 //
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182 // Send a file to the client
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183 //
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184 static void
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185 tftpd_read_file(struct tftp_server *server,
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186 struct tftphdr *hdr,
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187 struct sockaddr_in *from_addr, int from_len)
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188 {
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189 char data_out[SEGSIZE+sizeof(struct tftphdr)];
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190 char data_in[SEGSIZE+sizeof(struct tftphdr)];
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191 struct tftphdr *reply = (struct tftphdr *)data_out;
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192 struct tftphdr *response = (struct tftphdr *)data_in;
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193 int fd, block, len, tries, ok, data_len, s;
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194 struct timeval timeout;
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195 fd_set fds;
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196 int total_timeouts = 0;
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197 struct sockaddr_in client_addr, local_addr;
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198 int client_len;
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199
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200 s = socket(AF_INET, SOCK_DGRAM, 0);
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201 if (s < 0) {
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202 diag_printf("TFTPD: can't open socket for 'read_file'\n");
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203 return;
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204 }
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205 memset((char *)&local_addr, 0, sizeof(local_addr));
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206 local_addr.sin_family = AF_INET;
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207 local_addr.sin_addr.s_addr = htonl(INADDR_ANY);
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208 local_addr.sin_port = htons(INADDR_ANY);
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209 if (bind(s, (struct sockaddr *)&local_addr, sizeof(local_addr)) < 0) {
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210 // Problem setting up my end
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211 diag_printf("TFTPD: can't bind to reply port for 'read_file'\n");
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212 close(s);
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213 return;
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214 }
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215 if ((fd = (server->ops->open)(hdr->th_stuff, O_RDONLY)) < 0) {
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216 reply->th_opcode = htons(ERROR);
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217 reply->th_code = htons(ENOTFOUND);
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218 strcpy(reply->th_msg, "Can't open file");
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219 sendto(s, reply, 4+strlen(reply->th_msg)+1, 0,
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220 (struct sockaddr *)from_addr, from_len);
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221 close(s);
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222 return;
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223 }
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224 block = 0;
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225 ok = true;
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226 while (ok) {
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227 // Read next chunk of file
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228 len = (server->ops->read)(fd, reply->th_data, SEGSIZE);
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229 reply->th_block = htons(++block);
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230 reply->th_opcode = htons(DATA);
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231 for (tries = 0; tries < TFTP_RETRIES_MAX; tries++) {
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232 if (sendto(s, reply, 4+len, 0, (struct sockaddr *)from_addr, from_len) < 0) {
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233 // Something went wrong with the network!
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234 ok = false;
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235 break;
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236 }
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237 timeout.tv_sec = TFTP_TIMEOUT_PERIOD;
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238 timeout.tv_usec = 0;
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239 FD_ZERO(&fds);
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240 FD_SET(s, &fds);
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241 if (select(s+1, &fds, 0, 0, &timeout) <= 0) {
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242 if (++total_timeouts > TFTP_TIMEOUT_MAX) {
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243 ok = false;
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244 break;
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245 }
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246 }
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247 data_len = sizeof(data_in);
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248 client_len = sizeof(client_addr);
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249 if ((data_len = recvfrom(s, data_in, data_len, 0,
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250 (struct sockaddr *)&client_addr, &client_len)) < 0) {
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251 // What happened?
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252 ok = false;
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253 break;
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254 }
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255 if ((ntohs(response->th_opcode) == ACK) &&
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256 (ntohs(response->th_block) == block)) {
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257 break;
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258 }
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259 }
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260 if (len < SEGSIZE) {
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261 break;
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262 }
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263 }
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264 close(s);
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265 (server->ops->close)(fd);
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266 }
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267
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268 //
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269 // Actual TFTP server
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270 //
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271 static void
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272 tftpd_server(cyg_addrword_t p)
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273 {
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274 struct tftp_server *server = (struct tftp_server *)p;
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275 int s;
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276 int data_len, recv_len, from_len;
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277 struct sockaddr_in local_addr, from_addr;
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278 struct servent *server_info;
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279 char data[SEGSIZE+sizeof(struct tftphdr)];
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280 struct tftphdr *hdr = (struct tftphdr *)data;
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281
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282 #ifndef CYGPKG_NET_TESTS_USE_RT_TEST_HARNESS
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283 // Otherwise routine printfs fail the test - interrupts disabled too long.
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284 diag_printf("TFTPD: %x, port: %d\n", p, server->port);
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285 #endif
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286
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287 // Set up port
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288 if (server->port == 0) {
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289 server_info = getservbyname("tftp", "udp");
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290 if (server_info == (struct servent *)0) {
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291 diag_printf("TFTPD: can't get TFTP service information\n");
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292 return;
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293 }
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294 server->port = server_info->s_port;
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295 }
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296
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297 // Create socket
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298 s = socket(AF_INET, SOCK_DGRAM, 0);
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299 if (s < 0) {
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300 diag_printf("TFTPD: can't open socket\n");
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301 return;
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302 }
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303 memset((char *)&local_addr, 0, sizeof(local_addr));
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304 local_addr.sin_family = AF_INET;
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305 local_addr.sin_addr.s_addr = htonl(INADDR_ANY);
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306 local_addr.sin_port = htons(server->port);
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307 if (bind(s, (struct sockaddr *)&local_addr, sizeof(local_addr)) < 0) {
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308 // Problem setting up my end
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309 diag_printf("TFTPD: can't bind to service port\n");
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310 close(s);
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311 return;
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312 }
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313
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314 while (true) {
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315 recv_len = sizeof(data);
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316 from_len = sizeof(from_addr);
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317 if ((data_len = recvfrom(s, hdr, recv_len, 0,
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318 (struct sockaddr *)&from_addr, &from_len)) < 0) {
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319 diag_printf("TFTPD: can't read request\n");
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320 } else {
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321 #ifndef CYGPKG_NET_TESTS_USE_RT_TEST_HARNESS
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322 diag_printf("TFTPD: received %x from %s:%d\n",
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323 ntohs(hdr->th_opcode), inet_ntoa(from_addr.sin_addr), from_addr.sin_port);
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324 #endif
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325 switch (ntohs(hdr->th_opcode)) {
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326 case WRQ:
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327 tftpd_write_file(server, hdr, &from_addr, from_len);
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328 break;
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329 case RRQ:
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330 tftpd_read_file(server, hdr, &from_addr, from_len);
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331 break;
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332 case ACK:
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333 case DATA:
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334 case ERROR:
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335 // Ignore
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336 break;
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337 default:
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338 diag_printf("TFTPD: bogus request %x from %s:%d\n",
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339 ntohs(hdr->th_opcode), inet_ntoa(from_addr.sin_addr), from_addr.sin_port);
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340 hdr->th_opcode = htons(ERROR);
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341 hdr->th_code = htons(EBADOP);
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342 strcpy(hdr->th_msg, "Illegal request/operation");
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343 sendto(s, hdr, 4+strlen(hdr->th_msg)+1, 0,
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344 (struct sockaddr *)&from_addr, from_len);
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345 }
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346 }
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347 }
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348 }
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349
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350 //
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351 // This function is used to create a new server [thread] which supports
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352 // the TFTP protocol on the given port. A server 'id' will be returned
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353 // which can later be used to destroy the server.
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354 //
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355 // Note: all [memory] resources for the server thread will be allocated
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356 // dynamically. If there are insufficient resources, an error will be
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357 // returned.
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358 //
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359 int
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360 tftpd_start(int port, struct tftpd_fileops *ops)
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361 {
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362 struct tftp_server *server;
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363 if ((server = malloc(sizeof(struct tftp_server)))) {
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364 server->tag = TFTP_tag;
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365 server->port = port;
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366 server->ops = ops;
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367 cyg_thread_create(CYGPKG_NET_TFTPD_THREAD_PRIORITY, // Priority
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368 tftpd_server, // entry
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369 (cyg_addrword_t)server, // entry parameter
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370 "TFTP server", // Name
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371 &server->stack[0], // Stack
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372 STACK_SIZE, // Size
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373 &server->thread_handle, // Handle
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374 &server->thread_data // Thread data structure
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375 );
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376 cyg_thread_resume(server->thread_handle); // Start it
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377
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378 }
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379 return (int)server;
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380 }
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381
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382 //
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383 // Destroy a TFTP server, using a previously created server 'id'.
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384 //
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385 int
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386 tftpd_stop(int p)
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387 {
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388 struct tftp_server *server = (struct tftp_server *)p;
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389 // Simple sanity check
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390 if (server->tag == TFTP_tag) {
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391 cyg_thread_kill(server->thread_handle);
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392 cyg_thread_set_priority(server->thread_handle, 0);
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393 cyg_thread_delay(1); // Make sure it gets to die...
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394 if (cyg_thread_delete(server->thread_handle)) {
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395 // Success shutting down the thread
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396 free(server); // Give up memory
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397 return 1;
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398 }
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399 }
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400 return 0;
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401 }
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402
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403 // EOF tftp_server.c