src/server/daemon/httpparser.c

Sat, 28 Jan 2017 10:38:34 +0100

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Sat, 28 Jan 2017 10:38:34 +0100
changeset 162
b169992137a8
parent 101
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child 163
3589ed579127
permissions
-rw-r--r--

improves cgi error handling and allows requests with empty headers

also fixes broken windows porting commit

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1 /*
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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3 *
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4 * Copyright 2013 Olaf Wintermann. All rights reserved.
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5 *
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6 * Redistribution and use in source and binary forms, with or without
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7 * modification, are permitted provided that the following conditions are met:
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8 *
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9 * 1. Redistributions of source code must retain the above copyright
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10 * notice, this list of conditions and the following disclaimer.
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11 *
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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26 * POSSIBILITY OF SUCH DAMAGE.
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27 */
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28
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29 #include <stdio.h>
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30 #include <stdlib.h>
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31
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32 #include "httpparser.h"
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33 #include "../public/nsapi.h"
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34 //include "request.h"
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35
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36
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37 HttpParser* http_parser_new(HTTPRequest *request) {
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38 HttpParser *parser = malloc(sizeof(HttpParser));
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39 parser->request = request;
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40
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41 parser->state = 0;
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42 parser->start_line.ptr = (char*)request->netbuf->inbuf;
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43 parser->start_line.length = 0;
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44
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45 parser->offset = 0;
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46
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47 return parser;
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48 }
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49
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50 void http_parser_free(HttpParser *parser) {
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51 free(parser);
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52 }
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53
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54 int http_parser_process(HttpParser *parser) {
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55 switch(parser->state) {
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56 case 0: {
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57 int r = get_start_line(parser);
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58 switch(r) {
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59 case 0: break;
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60 default: return r;
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61 }
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62 parse_request_line(parser);
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63 parser->state++;
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64 }
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65 case 1: {
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66 return http_parser_parse_header(parser);
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67 }
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68 case 2: {
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69 return 0;
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70 }
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71 }
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72 return -1;
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73 }
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74
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75 int get_start_line(HttpParser *parser) {
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76 netbuf *buf = parser->request->netbuf;
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77 while(buf->pos < buf->cursize) {
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78 unsigned char c = buf->inbuf[buf->pos];
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79 if(c == '\n') {
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80 size_t lnlen = buf->pos - parser->offset + 1;
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81 if(lnlen <= 2) {
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82 if(lnlen == 1 || buf->inbuf[buf->pos-1] == '\r') {
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83 // skip empty line
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84 buf->pos++;
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85 parser->offset = buf->pos;
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86 return 1;
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87 }
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88 // insufficient chars for request, return error
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89 return 2;
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90 }
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91 if(buf->inbuf[buf->pos - 1] == '\r') {
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92 parser->start_line.length = lnlen - 1;
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93 } else {
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94 parser->start_line.length = lnlen;
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95 }
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96 parser->start_line.ptr = (char*)buf->inbuf + parser->offset;
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97 buf->pos++;
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98 return 0;
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99 }
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100 buf->pos++;
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101 }
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102 return 1;
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103 }
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104
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105 int http_parser_parse_header(HttpParser *parser) {
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106 netbuf *buf = parser->request->netbuf;
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107
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108 parser->offset = buf->pos; // line offset
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109 parser->name.ptr = NULL;
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110 parser->name.length = 0;
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111 parser->value.ptr = NULL;
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112 parser->value.length = 0;
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113 while(1) {
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114 if(buf->pos >= buf->cursize) {
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115 return 1;
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116 }
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117 char c = (char)buf->inbuf[buf->pos++];
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118
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119 if(c > 32) {
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120 parser->wl = 0;
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121 if(c == ':' && parser->value.ptr == NULL) {
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122 parser->name.ptr = (char*)buf->inbuf + parser->offset;
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123 parser->name.length = buf->pos - parser->offset - 1;
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124 } else if(parser->name.ptr != NULL && parser->value.ptr == NULL) {
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125 parser->value.ptr = (char*)buf->inbuf + buf->pos - 1;
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126 }
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127 } else if(c == '\n') {
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128 if(parser->wl) {
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129 // line contains only white space -> end of request
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130 parser->state++;
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131 return 0;
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132 } else {
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133 parser->offset = buf->pos;
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134 if(parser->name.length != 0) {
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135 if(parser->value.ptr) {
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136 parser->value.length = (buf->inbuf + buf->pos - 1)
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137 - (unsigned char*)parser->value.ptr;
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138 if(buf->inbuf[buf->pos-2] == '\r') {
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139 parser->value.length--;
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140 }
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141 }
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142 // add header
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143 header_add(
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144 parser->request->headers,
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145 parser->name,
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146 parser->value);
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147 } else {
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148 // error: no value
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149 return 2;
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150 }
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151 parser->name.ptr = NULL;
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152 parser->value.ptr = NULL;
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153 parser->name.length = 0;
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154 parser->value.length = 0;
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155 parser->wl = 1;
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156 }
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157 }
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158 }
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159 }
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160
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161 int parse_request_line(HttpParser *parser) {
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162 sstr_t line = parser->start_line;
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163 parser->request->request_line = line;
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164
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165 /*
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166 * parse method, url and http version
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167 */
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168
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169 int i = 0;
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170 int ns = 0;
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171
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172 parser->request->method.ptr = line.ptr;
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173 for(;i<line.length;i++) {
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174 if(!ns && line.ptr[i] == ' ') {
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175 ns = 1;
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176 //line.ptr[i] = 0; // TODO: remove
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177 parser->request->method.length = i;
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178 } else if(ns) {
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179 if(line.ptr[i] != ' ') {
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180 break;
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181 }
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182 }
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183 }
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184
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185 parser->request->uri.ptr = line.ptr + i;
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186 ns = 0;
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187 int s = i;
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188 for(;i<line.length;i++) {
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189 if(!ns && line.ptr[i] < 33) {
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190 ns = 1;
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191 //line.ptr[i] = 0; // TODO: remove
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192 parser->request->uri.length = i - s;
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193 } else if(ns) {
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194 if(line.ptr[i] > 32) {
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195 break;
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196 }
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197 }
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198 }
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199
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200 parser->request->httpv.ptr = line.ptr + i;
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201 ns = 0;
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202 s = i;
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203 for(;i<line.length;i++) {
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204 if(!ns && line.ptr[i] < 33) {
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205 ns = 1;
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206 //line.ptr[i] = 0; // TODO: remove
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207 parser->request->httpv.length = i - s;
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208 } else if(ns) {
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209 if(line.ptr[i] > 32) {
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210 break;
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211 }
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212 }
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213 }
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214
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215 return 0;
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216 }

mercurial