1 | /**
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2 | * @file
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3 | * HTTP server
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4 | */
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5 |
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6 | /*
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7 | * Copyright (c) 2001-2003 Swedish Institute of Computer Science.
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8 | * All rights reserved.
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9 | *
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10 | * Redistribution and use in source and binary forms, with or without modification,
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11 | * are permitted provided that the following conditions are met:
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12 | *
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13 | * 1. Redistributions of source code must retain the above copyright notice,
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14 | * this list of conditions and the following disclaimer.
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15 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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16 | * this list of conditions and the following disclaimer in the documentation
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17 | * and/or other materials provided with the distribution.
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18 | * 3. The name of the author may not be used to endorse or promote products
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19 | * derived from this software without specific prior written permission.
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20 | *
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21 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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22 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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23 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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24 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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25 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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26 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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27 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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28 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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29 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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30 | * OF SUCH DAMAGE.
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31 | *
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32 | * This file is part of the lwIP TCP/IP stack.
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33 | *
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34 | * Author: Adam Dunkels <adam@sics.se>
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35 | *
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36 | * This version of the file has been modified by Texas Instruments to offer
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37 | * simple server-side-include (SSI) and Common Gateway Interface (CGI)
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38 | * capability.
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39 | */
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40 |
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41 | #ifndef LWIP_HDR_APPS_HTTPD_H
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42 | #define LWIP_HDR_APPS_HTTPD_H
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43 |
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44 | #include "httpd_opts.h"
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45 | #include "lwip/err.h"
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46 | #include "lwip/pbuf.h"
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47 |
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48 | #ifdef __cplusplus
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49 | extern "C" {
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50 | #endif
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51 |
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52 | #if LWIP_HTTPD_CGI
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53 |
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54 | /**
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55 | * @ingroup httpd
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56 | * Function pointer for a CGI script handler.
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57 | *
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58 | * This function is called each time the HTTPD server is asked for a file
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59 | * whose name was previously registered as a CGI function using a call to
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60 | * http_set_cgi_handlers. The iIndex parameter provides the index of the
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61 | * CGI within the cgis array passed to http_set_cgi_handlers. Parameters
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62 | * pcParam and pcValue provide access to the parameters provided along with
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63 | * the URI. iNumParams provides a count of the entries in the pcParam and
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64 | * pcValue arrays. Each entry in the pcParam array contains the name of a
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65 | * parameter with the corresponding entry in the pcValue array containing the
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66 | * value for that parameter. Note that pcParam may contain multiple elements
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67 | * with the same name if, for example, a multi-selection list control is used
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68 | * in the form generating the data.
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69 | *
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70 | * The function should return a pointer to a character string which is the
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71 | * path and filename of the response that is to be sent to the connected
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72 | * browser, for example "/thanks.htm" or "/response/error.ssi".
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73 | *
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74 | * The maximum number of parameters that will be passed to this function via
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75 | * iNumParams is defined by LWIP_HTTPD_MAX_CGI_PARAMETERS. Any parameters in
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76 | * the incoming HTTP request above this number will be discarded.
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77 | *
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78 | * Requests intended for use by this CGI mechanism must be sent using the GET
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79 | * method (which encodes all parameters within the URI rather than in a block
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80 | * later in the request). Attempts to use the POST method will result in the
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81 | * request being ignored.
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82 | *
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83 | */
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84 | typedef const char *(*tCGIHandler)(int iIndex, int iNumParams, char *pcParam[],
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85 | char *pcValue[]);
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86 |
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87 | /**
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88 | * @ingroup httpd
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89 | * Structure defining the base filename (URL) of a CGI and the associated
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90 | * function which is to be called when that URL is requested.
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91 | */
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92 | typedef struct
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93 | {
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94 | const char *pcCGIName;
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95 | tCGIHandler pfnCGIHandler;
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96 | } tCGI;
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97 |
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98 | void http_set_cgi_handlers(const tCGI *pCGIs, int iNumHandlers);
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99 |
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100 | #endif /* LWIP_HTTPD_CGI */
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101 |
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102 | #if LWIP_HTTPD_CGI || LWIP_HTTPD_CGI_SSI
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103 |
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104 | #if LWIP_HTTPD_CGI_SSI
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105 | /* we have to prototype this struct here to make it available for the handler */
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106 | struct fs_file;
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107 |
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108 | /** Define this generic CGI handler in your application.
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109 | * It is called once for every URI with parameters.
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110 | * The parameters can be stored to the object passed as connection_state, which
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111 | * is allocated to file->state via fs_state_init() from fs_open() or fs_open_custom().
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112 | * Content creation via SSI or complete dynamic files can retrieve the CGI params from there.
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113 | */
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114 | extern void httpd_cgi_handler(struct fs_file *file, const char* uri, int iNumParams,
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115 | char **pcParam, char **pcValue
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116 | #if defined(LWIP_HTTPD_FILE_STATE) && LWIP_HTTPD_FILE_STATE
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117 | , void *connection_state
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118 | #endif /* LWIP_HTTPD_FILE_STATE */
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119 | );
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120 | #endif /* LWIP_HTTPD_CGI_SSI */
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121 |
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122 | #endif /* LWIP_HTTPD_CGI || LWIP_HTTPD_CGI_SSI */
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123 |
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124 | #if LWIP_HTTPD_SSI
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125 |
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126 | /**
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127 | * @ingroup httpd
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128 | * Function pointer for the SSI tag handler callback.
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129 | *
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130 | * This function will be called each time the HTTPD server detects a tag of the
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131 | * form <!--#name--> in files with extensions mentioned in the g_pcSSIExtensions
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132 | * array (currently .shtml, .shtm, .ssi, .xml, .json) where "name" appears as
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133 | * one of the tags supplied to http_set_ssi_handler in the tags array. The
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134 | * returned insert string, which will be appended after the the string
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135 | * "<!--#name-->" in file sent back to the client, should be written to pointer
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136 | * pcInsert. iInsertLen contains the size of the buffer pointed to by
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137 | * pcInsert. The iIndex parameter provides the zero-based index of the tag as
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138 | * found in the tags array and identifies the tag that is to be processed.
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139 | *
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140 | * The handler returns the number of characters written to pcInsert excluding
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141 | * any terminating NULL or HTTPD_SSI_TAG_UNKNOWN when tag is not recognized.
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142 | *
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143 | * Note that the behavior of this SSI mechanism is somewhat different from the
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144 | * "normal" SSI processing as found in, for example, the Apache web server. In
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145 | * this case, the inserted text is appended following the SSI tag rather than
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146 | * replacing the tag entirely. This allows for an implementation that does not
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147 | * require significant additional buffering of output data yet which will still
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148 | * offer usable SSI functionality. One downside to this approach is when
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149 | * attempting to use SSI within JavaScript. The SSI tag is structured to
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150 | * resemble an HTML comment but this syntax does not constitute a comment
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151 | * within JavaScript and, hence, leaving the tag in place will result in
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152 | * problems in these cases. In order to avoid these problems, define
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153 | * LWIP_HTTPD_SSI_INCLUDE_TAG as zero in your lwip options file, or use JavaScript
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154 | * style block comments in the form / * # name * / (without the spaces).
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155 | */
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156 | typedef u16_t (*tSSIHandler)(
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157 | #if LWIP_HTTPD_SSI_RAW
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158 | const char* ssi_tag_name,
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159 | #else /* LWIP_HTTPD_SSI_RAW */
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160 | int iIndex,
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161 | #endif /* LWIP_HTTPD_SSI_RAW */
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162 | char *pcInsert, int iInsertLen
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163 | #if LWIP_HTTPD_SSI_MULTIPART
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164 | , u16_t current_tag_part, u16_t *next_tag_part
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165 | #endif /* LWIP_HTTPD_SSI_MULTIPART */
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166 | #if defined(LWIP_HTTPD_FILE_STATE) && LWIP_HTTPD_FILE_STATE
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167 | , void *connection_state
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168 | #endif /* LWIP_HTTPD_FILE_STATE */
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169 | );
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170 |
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171 | /** Set the SSI handler function
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172 | * (if LWIP_HTTPD_SSI_RAW==1, only the first argument is used)
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173 | */
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174 | void http_set_ssi_handler(tSSIHandler pfnSSIHandler,
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175 | const char **ppcTags, int iNumTags);
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176 |
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177 | /** For LWIP_HTTPD_SSI_RAW==1, return this to indicate the tag is unknown.
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178 | * In this case, the webserver writes a warning into the page.
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179 | * You can also just return 0 to write nothing for unknown tags.
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180 | */
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181 | #define HTTPD_SSI_TAG_UNKNOWN 0xFFFF
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182 |
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183 | #endif /* LWIP_HTTPD_SSI */
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184 |
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185 | #if LWIP_HTTPD_SUPPORT_POST
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186 |
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187 | /* These functions must be implemented by the application */
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188 |
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189 | /**
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190 | * @ingroup httpd
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191 | * Called when a POST request has been received. The application can decide
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192 | * whether to accept it or not.
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193 | *
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194 | * @param connection Unique connection identifier, valid until httpd_post_end
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195 | * is called.
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196 | * @param uri The HTTP header URI receiving the POST request.
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197 | * @param http_request The raw HTTP request (the first packet, normally).
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198 | * @param http_request_len Size of 'http_request'.
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199 | * @param content_len Content-Length from HTTP header.
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200 | * @param response_uri Filename of response file, to be filled when denying the
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201 | * request
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202 | * @param response_uri_len Size of the 'response_uri' buffer.
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203 | * @param post_auto_wnd Set this to 0 to let the callback code handle window
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204 | * updates by calling 'httpd_post_data_recved' (to throttle rx speed)
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205 | * default is 1 (httpd handles window updates automatically)
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206 | * @return ERR_OK: Accept the POST request, data may be passed in
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207 | * another err_t: Deny the POST request, send back 'bad request'.
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208 | */
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209 | err_t httpd_post_begin(void *connection, const char *uri, const char *http_request,
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210 | u16_t http_request_len, int content_len, char *response_uri,
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211 | u16_t response_uri_len, u8_t *post_auto_wnd);
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212 |
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213 | /**
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214 | * @ingroup httpd
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215 | * Called for each pbuf of data that has been received for a POST.
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216 | * ATTENTION: The application is responsible for freeing the pbufs passed in!
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217 | *
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218 | * @param connection Unique connection identifier.
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219 | * @param p Received data.
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220 | * @return ERR_OK: Data accepted.
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221 | * another err_t: Data denied, http_post_get_response_uri will be called.
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222 | */
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223 | err_t httpd_post_receive_data(void *connection, struct pbuf *p);
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224 |
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225 | /**
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226 | * @ingroup httpd
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227 | * Called when all data is received or when the connection is closed.
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228 | * The application must return the filename/URI of a file to send in response
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229 | * to this POST request. If the response_uri buffer is untouched, a 404
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230 | * response is returned.
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231 | *
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232 | * @param connection Unique connection identifier.
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233 | * @param response_uri Filename of response file, to be filled when denying the request
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234 | * @param response_uri_len Size of the 'response_uri' buffer.
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235 | */
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236 | void httpd_post_finished(void *connection, char *response_uri, u16_t response_uri_len);
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237 |
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238 | #if LWIP_HTTPD_POST_MANUAL_WND
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239 | void httpd_post_data_recved(void *connection, u16_t recved_len);
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240 | #endif /* LWIP_HTTPD_POST_MANUAL_WND */
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241 |
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242 | #endif /* LWIP_HTTPD_SUPPORT_POST */
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243 |
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244 | void httpd_init(void);
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245 |
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246 | #if HTTPD_ENABLE_HTTPS
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247 | struct altcp_tls_config;
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248 | void httpd_inits(struct altcp_tls_config *conf);
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249 | #endif
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250 |
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251 | #ifdef __cplusplus
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252 | }
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253 | #endif
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254 |
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255 | #endif /* LWIP_HDR_APPS_HTTPD_H */
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