0
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_http.h>
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10
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11
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12 ngx_int_t ngx_http_parse_request_line(ngx_http_request_t *r, ngx_buf_t *b)
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13 {
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14 u_char ch, *p, *m;
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15 enum {
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16 sw_start = 0,
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17 sw_method,
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18 sw_space_after_method,
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19 sw_spaces_before_uri,
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20 sw_schema,
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21 sw_schema_slash,
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22 sw_schema_slash_slash,
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23 sw_host,
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24 sw_port,
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25 sw_after_slash_in_uri,
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26 sw_check_uri,
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27 sw_uri,
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28 sw_http_09,
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29 sw_http_H,
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30 sw_http_HT,
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31 sw_http_HTT,
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32 sw_http_HTTP,
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33 sw_first_major_digit,
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34 sw_major_digit,
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35 sw_first_minor_digit,
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36 sw_minor_digit,
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37 sw_almost_done,
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38 sw_done
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39 } state;
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40
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41 state = r->state;
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42 p = b->pos;
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43
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44 while (p < b->last && state < sw_done) {
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45 ch = *p++;
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46
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47 /* gcc 2.95.2 and msvc 6.0 compile this switch as an jump table */
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48
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49 switch (state) {
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50
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51 /* HTTP methods: GET, HEAD, POST */
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52 case sw_start:
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53 r->request_start = p - 1;
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54
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55 if (ch == CR || ch == LF) {
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56 break;
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57 }
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58
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59 if (ch < 'A' || ch > 'Z') {
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60 return NGX_HTTP_PARSE_INVALID_METHOD;
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61 }
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62
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63 state = sw_method;
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64 break;
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65
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66 case sw_method:
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67 if (ch == ' ') {
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68 r->method_end = p - 1;
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69 m = r->request_start;
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70
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71 if (r->method_end - m == 3) {
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72
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73 if (m[0] == 'G' && m[1] == 'E' && m[2] == 'T') {
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74 r->method = NGX_HTTP_GET;
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75 }
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76
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77 } else if (r->method_end - m == 4) {
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78
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79 if (m[0] == 'P' && m[1] == 'O'
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80 && m[2] == 'T' && m[3] == 'T')
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81 {
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82 r->method = NGX_HTTP_POST;
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83
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84 } else if (m[0] == 'H' && m[1] == 'E'
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85 && m[2] == 'A' && m[3] == 'D')
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86 {
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87 r->method = NGX_HTTP_HEAD;
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88 }
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89 }
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90
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91 state = sw_spaces_before_uri;
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92 break;
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93 }
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94
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95 if (ch < 'A' || ch > 'Z') {
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96 return NGX_HTTP_PARSE_INVALID_METHOD;
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97 }
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98
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99 break;
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100
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101 /* single space after method */
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102 case sw_space_after_method:
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103 switch (ch) {
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104 case ' ':
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105 state = sw_spaces_before_uri;
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106 break;
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107 default:
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108 return NGX_HTTP_PARSE_INVALID_METHOD;
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109 }
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110 break;
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111
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112 /* space* before URI */
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113 case sw_spaces_before_uri:
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114 switch (ch) {
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115 case '/':
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116 r->uri_start = p - 1;
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117 state = sw_after_slash_in_uri;
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118 break;
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119 case ' ':
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120 break;
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121 default:
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122 if ((ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z')) {
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123 r->schema_start = p - 1;
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124 state = sw_schema;
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125 break;
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126 }
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127 return NGX_HTTP_PARSE_INVALID_REQUEST;
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128 }
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129 break;
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130
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131 case sw_schema:
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132 switch (ch) {
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133 case ':':
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134 r->schema_end = p - 1;
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135 state = sw_schema_slash;
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136 break;
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137 default:
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138 if ((ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z')) {
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139 break;
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140 }
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141 return NGX_HTTP_PARSE_INVALID_REQUEST;
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142 }
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143 break;
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144
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145 case sw_schema_slash:
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146 switch (ch) {
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147 case '/':
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148 state = sw_schema_slash_slash;
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149 break;
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150 default:
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151 return NGX_HTTP_PARSE_INVALID_REQUEST;
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152 }
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153 break;
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154
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155 case sw_schema_slash_slash:
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156 switch (ch) {
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157 case '/':
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158 r->host_start = p - 1;
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159 state = sw_host;
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160 break;
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161 default:
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162 return NGX_HTTP_PARSE_INVALID_REQUEST;
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163 }
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164 break;
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165
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166 case sw_host:
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167 switch (ch) {
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168 case ':':
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169 r->host_end = p - 1;
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170 state = sw_port;
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171 break;
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172 case '/':
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173 r->host_end = p - 1;
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174 r->uri_start = p - 1;
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175 state = sw_after_slash_in_uri;
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176 break;
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177 default:
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178 if ((ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z')
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179 || (ch >= '0' && ch <= '9') || ch == '.' || ch == '-')
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180 {
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181 break;
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182 }
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183 return NGX_HTTP_PARSE_INVALID_REQUEST;
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184 }
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185 break;
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186
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187 case sw_port:
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188 switch (ch) {
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189 case '/':
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190 r->port_end = p - 1;
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191 r->uri_start = p - 1;
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192 state = sw_after_slash_in_uri;
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193 break;
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194 default:
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195 if (ch < '0' && ch > '9') {
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196 return NGX_HTTP_PARSE_INVALID_REQUEST;
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197 }
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198 break;
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199 }
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200 break;
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201
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202 /* check "/.", "//", and "%" in URI */
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203 case sw_after_slash_in_uri:
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204 switch (ch) {
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205 case CR:
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206 r->uri_end = p - 1;
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207 r->http_minor = 9;
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208 state = sw_almost_done;
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209 break;
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210 case LF:
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211 r->uri_end = p - 1;
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212 r->http_minor = 9;
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213 state = sw_done;
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214 break;
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215 case ' ':
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216 r->uri_end = p - 1;
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217 state = sw_http_09;
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218 break;
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219 case '.':
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220 case '%':
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221 r->complex_uri = 1;
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222 state = sw_uri;
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223 break;
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224 case '/':
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225 r->complex_uri = 1;
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226 break;
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227 case '?':
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228 r->args_start = p;
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229 state = sw_uri;
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230 break;
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231 default:
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232 state = sw_check_uri;
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233 break;
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234 }
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235 break;
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236
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237 /* check "/" and "%" in URI */
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238 case sw_check_uri:
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239 switch (ch) {
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240 case CR:
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241 r->uri_end = p - 1;
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242 r->http_minor = 9;
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243 state = sw_almost_done;
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244 break;
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245 case LF:
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246 r->uri_end = p - 1;
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247 r->http_minor = 9;
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248 state = sw_done;
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249 break;
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250 case ' ':
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251 r->uri_end = p - 1;
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252 state = sw_http_09;
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253 break;
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254 case '.':
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255 r->uri_ext = p;
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256 break;
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257 case '/':
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258 r->uri_ext = NULL;
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259 state = sw_after_slash_in_uri;
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260 break;
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261 case '%':
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262 r->complex_uri = 1;
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263 state = sw_uri;
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264 break;
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265 case '?':
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266 r->args_start = p;
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267 state = sw_uri;
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268 break;
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269 }
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270 break;
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271
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272 /* URI */
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273 case sw_uri:
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274 switch (ch) {
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275 case CR:
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276 r->uri_end = p - 1;
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277 r->http_minor = 9;
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278 state = sw_almost_done;
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279 break;
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280 case LF:
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281 r->uri_end = p - 1;
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282 r->http_minor = 9;
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283 state = sw_done;
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284 break;
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285 case ' ':
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286 r->uri_end = p - 1;
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287 state = sw_http_09;
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288 break;
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289 }
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290 break;
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291
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292 /* space+ after URI */
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293 case sw_http_09:
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294 switch (ch) {
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295 case ' ':
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296 break;
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297 case CR:
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298 r->http_minor = 9;
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299 state = sw_almost_done;
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300 break;
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301 case LF:
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302 r->http_minor = 9;
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303 state = sw_done;
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304 break;
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305 case 'H':
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306 state = sw_http_H;
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307 break;
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308 default:
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309 return NGX_HTTP_PARSE_INVALID_REQUEST;
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310 }
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311 break;
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312
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313 case sw_http_H:
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314 switch (ch) {
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315 case 'T':
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316 state = sw_http_HT;
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317 break;
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318 default:
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319 return NGX_HTTP_PARSE_INVALID_REQUEST;
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320 }
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321 break;
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322
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323 case sw_http_HT:
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324 switch (ch) {
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325 case 'T':
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326 state = sw_http_HTT;
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327 break;
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328 default:
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329 return NGX_HTTP_PARSE_INVALID_REQUEST;
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330 }
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331 break;
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332
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333 case sw_http_HTT:
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334 switch (ch) {
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335 case 'P':
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336 state = sw_http_HTTP;
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337 break;
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338 default:
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339 return NGX_HTTP_PARSE_INVALID_REQUEST;
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340 }
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341 break;
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342
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343 case sw_http_HTTP:
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344 switch (ch) {
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345 case '/':
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346 state = sw_first_major_digit;
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347 break;
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348 default:
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349 return NGX_HTTP_PARSE_INVALID_REQUEST;
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350 }
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351 break;
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352
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353 /* first digit of major HTTP version */
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354 case sw_first_major_digit:
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355 if (ch < '1' || ch > '9') {
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356 return NGX_HTTP_PARSE_INVALID_REQUEST;
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357 }
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358
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359 r->http_major = ch - '0';
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360 state = sw_major_digit;
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361 break;
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362
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363 /* major HTTP version or dot */
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364 case sw_major_digit:
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365 if (ch == '.') {
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366 state = sw_first_minor_digit;
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367 break;
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368 }
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369
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370 if (ch < '0' || ch > '9') {
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371 return NGX_HTTP_PARSE_INVALID_REQUEST;
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372 }
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373
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374 r->http_major = r->http_major * 10 + ch - '0';
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375 break;
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376
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377 /* first digit of minor HTTP version */
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378 case sw_first_minor_digit:
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379 if (ch < '0' || ch > '9') {
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380 return NGX_HTTP_PARSE_INVALID_REQUEST;
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381 }
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382
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383 r->http_minor = ch - '0';
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384 state = sw_minor_digit;
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385 break;
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386
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387 /* minor HTTP version or end of request line */
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388 case sw_minor_digit:
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389 if (ch == CR) {
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390 state = sw_almost_done;
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391 break;
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392 }
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393
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394 if (ch == LF) {
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395 state = sw_done;
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396 break;
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397 }
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398
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399 if (ch < '0' || ch > '9') {
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400 return NGX_HTTP_PARSE_INVALID_REQUEST;
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401 }
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402
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403 r->http_minor = r->http_minor * 10 + ch - '0';
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404 break;
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405
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406 /* end of request line */
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407 case sw_almost_done:
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408 r->request_end = p - 2;
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409 switch (ch) {
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410 case LF:
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411 state = sw_done;
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412 break;
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413 default:
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414 return NGX_HTTP_PARSE_INVALID_REQUEST;
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415 }
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416 break;
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417
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418 /* suppress warning */
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419 case sw_done:
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420 break;
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421 }
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422 }
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423
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424 b->pos = p;
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425
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426 if (state == sw_done) {
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427 if (r->request_end == NULL) {
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428 r->request_end = p - 1;
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429 }
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430
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431 r->http_version = r->http_major * 1000 + r->http_minor;
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432 r->state = sw_start;
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433
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434 if (r->http_version == 9 && r->method != NGX_HTTP_GET) {
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435 return NGX_HTTP_PARSE_INVALID_09_METHOD;
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436 }
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437
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438 return NGX_OK;
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439
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440 } else {
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441 r->state = state;
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442 return NGX_AGAIN;
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443 }
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444 }
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445
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446
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447 ngx_int_t ngx_http_parse_header_line(ngx_http_request_t *r, ngx_buf_t *b)
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448 {
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449 u_char c, ch, *p;
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450 enum {
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451 sw_start = 0,
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452 sw_name,
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453 sw_space_before_value,
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454 sw_value,
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455 sw_space_after_value,
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456 sw_almost_done,
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457 sw_header_almost_done,
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458 sw_ignore_line,
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459 sw_done,
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460 sw_header_done
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461 } state;
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462
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463 state = r->state;
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464 p = b->pos;
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465
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466 while (p < b->last && state < sw_done) {
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467 ch = *p++;
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468
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469 switch (state) {
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470
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471 /* first char */
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472 case sw_start:
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473 switch (ch) {
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474 case CR:
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475 r->header_end = p - 1;
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476 state = sw_header_almost_done;
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477 break;
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478 case LF:
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479 r->header_end = p - 1;
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480 state = sw_header_done;
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481 break;
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482 default:
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483 state = sw_name;
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484 r->header_name_start = p - 1;
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485
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486 c = (u_char) (ch | 0x20);
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487 if (c >= 'a' && c <= 'z') {
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488 break;
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489 }
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490
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491 if (ch == '-' || ch == '_' || ch == '~' || ch == '.') {
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492 break;
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493 }
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494
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495 if (ch >= '0' && ch <= '9') {
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496 break;
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497 }
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498
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499 return NGX_HTTP_PARSE_INVALID_HEADER;
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500
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501 }
|
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502 break;
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503
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504 /* header name */
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505 case sw_name:
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506 c = (u_char) (ch | 0x20);
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507 if (c >= 'a' && c <= 'z') {
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508 break;
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509 }
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510
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511 if (ch == ':') {
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512 r->header_name_end = p - 1;
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513 state = sw_space_before_value;
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514 break;
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515 }
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516
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517 if (ch == '-' || ch == '_' || ch == '~' || ch == '.') {
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518 break;
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519 }
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520
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521 if (ch >= '0' && ch <= '9') {
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522 break;
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523 }
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524
|
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525 /* IIS can send duplicate "HTTP/1.1 ..." lines */
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526 if (ch == '/'
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527 && r->proxy
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528 && p - r->header_start == 5
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529 && ngx_strncmp(r->header_start, "HTTP", 4) == 0)
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530 {
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531 state = sw_ignore_line;
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532 break;
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533 }
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534
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535 return NGX_HTTP_PARSE_INVALID_HEADER;
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536
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537 /* space* before header value */
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538 case sw_space_before_value:
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539 switch (ch) {
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540 case ' ':
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541 break;
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542 case CR:
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543 r->header_start = r->header_end = p - 1;
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544 state = sw_almost_done;
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545 break;
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546 case LF:
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547 r->header_start = r->header_end = p - 1;
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548 state = sw_done;
|
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549 break;
|
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550 default:
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551 r->header_start = p - 1;
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552 state = sw_value;
|
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553 break;
|
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554 }
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555 break;
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556
|
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557 /* header value */
|
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558 case sw_value:
|
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559 switch (ch) {
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560 case ' ':
|
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561 r->header_end = p - 1;
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562 state = sw_space_after_value;
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563 break;
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564 case CR:
|
|
565 r->header_end = p - 1;
|
|
566 state = sw_almost_done;
|
|
567 break;
|
|
568 case LF:
|
|
569 r->header_end = p - 1;
|
|
570 state = sw_done;
|
|
571 break;
|
|
572 }
|
|
573 break;
|
|
574
|
|
575 /* space* before end of header line */
|
|
576 case sw_space_after_value:
|
|
577 switch (ch) {
|
|
578 case ' ':
|
|
579 break;
|
|
580 case CR:
|
|
581 state = sw_almost_done;
|
|
582 break;
|
|
583 case LF:
|
|
584 state = sw_done;
|
|
585 break;
|
|
586 default:
|
|
587 state = sw_value;
|
|
588 break;
|
|
589 }
|
|
590 break;
|
|
591
|
|
592 /* ignore header line */
|
|
593 case sw_ignore_line:
|
|
594 switch (ch) {
|
|
595 case LF:
|
|
596 state = sw_start;
|
|
597 break;
|
|
598 default:
|
|
599 break;
|
|
600 }
|
|
601 break;
|
|
602
|
|
603 /* end of header line */
|
|
604 case sw_almost_done:
|
|
605 switch (ch) {
|
|
606 case LF:
|
|
607 state = sw_done;
|
|
608 break;
|
|
609 default:
|
|
610 return NGX_HTTP_PARSE_INVALID_HEADER;
|
|
611 }
|
|
612 break;
|
|
613
|
|
614 /* end of header */
|
|
615 case sw_header_almost_done:
|
|
616 switch (ch) {
|
|
617 case LF:
|
|
618 state = sw_header_done;
|
|
619 break;
|
|
620 default:
|
|
621 return NGX_HTTP_PARSE_INVALID_HEADER;
|
|
622 }
|
|
623 break;
|
|
624
|
|
625 /* suppress warning */
|
|
626 case sw_done:
|
|
627 case sw_header_done:
|
|
628 break;
|
|
629 }
|
|
630 }
|
|
631
|
|
632 b->pos = p;
|
|
633
|
|
634 if (state == sw_done) {
|
|
635 r->state = sw_start;
|
|
636 return NGX_OK;
|
|
637
|
|
638 } else if (state == sw_header_done) {
|
|
639 r->state = sw_start;
|
|
640 return NGX_HTTP_PARSE_HEADER_DONE;
|
|
641
|
|
642 } else {
|
|
643 r->state = state;
|
|
644 return NGX_AGAIN;
|
|
645 }
|
|
646 }
|
|
647
|
|
648
|
|
649 ngx_int_t ngx_http_parse_complex_uri(ngx_http_request_t *r)
|
|
650 {
|
|
651 u_char c, ch, decoded, *p, *u;
|
|
652 enum {
|
|
653 sw_usual = 0,
|
|
654 sw_slash,
|
|
655 sw_dot,
|
|
656 sw_dot_dot,
|
|
657 #if (WIN32)
|
|
658 sw_dot_dot_dot,
|
|
659 #endif
|
|
660 sw_quoted,
|
|
661 sw_quoted_second
|
|
662 } state, quoted_state;
|
|
663
|
|
664 decoded = '\0';
|
|
665 quoted_state = sw_usual;
|
|
666
|
|
667 state = sw_usual;
|
|
668 p = r->uri_start;
|
|
669 u = r->uri.data;
|
|
670 r->uri_ext = NULL;
|
|
671
|
|
672 ch = *p++;
|
|
673
|
|
674 while (p < r->uri_start + r->uri.len + 1) {
|
|
675
|
|
676 ngx_log_debug4(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
677 "s:%d in:'%x:%c', out:'%c'", state, ch, ch, *u);
|
|
678
|
|
679 switch (state) {
|
|
680 case sw_usual:
|
|
681 switch(ch) {
|
|
682 case '/':
|
|
683 r->uri_ext = NULL;
|
|
684 state = sw_slash;
|
|
685 *u++ = ch;
|
|
686 break;
|
|
687 case '%':
|
|
688 quoted_state = state;
|
|
689 state = sw_quoted;
|
|
690 break;
|
|
691 case '.':
|
|
692 r->uri_ext = u + 1;
|
|
693 default:
|
|
694 *u++ = ch;
|
|
695 break;
|
|
696 }
|
|
697 ch = *p++;
|
|
698 break;
|
|
699
|
|
700 case sw_slash:
|
|
701 switch(ch) {
|
|
702 case '/':
|
|
703 break;
|
|
704 case '.':
|
|
705 state = sw_dot;
|
|
706 *u++ = ch;
|
|
707 break;
|
|
708 case '%':
|
|
709 quoted_state = state;
|
|
710 state = sw_quoted;
|
|
711 break;
|
|
712 default:
|
|
713 state = sw_usual;
|
|
714 *u++ = ch;
|
|
715 break;
|
|
716 }
|
|
717 ch = *p++;
|
|
718 break;
|
|
719
|
|
720 case sw_dot:
|
|
721 switch(ch) {
|
|
722 case '/':
|
|
723 state = sw_slash;
|
|
724 u--;
|
|
725 break;
|
|
726 case '.':
|
|
727 state = sw_dot_dot;
|
|
728 *u++ = ch;
|
|
729 break;
|
|
730 case '%':
|
|
731 quoted_state = state;
|
|
732 state = sw_quoted;
|
|
733 break;
|
|
734 default:
|
|
735 state = sw_usual;
|
|
736 *u++ = ch;
|
|
737 break;
|
|
738 }
|
|
739 ch = *p++;
|
|
740 break;
|
|
741
|
|
742 case sw_dot_dot:
|
|
743 switch(ch) {
|
|
744 case '/':
|
|
745 state = sw_slash;
|
|
746 u -= 4;
|
|
747 if (u < r->uri.data) {
|
|
748 return NGX_HTTP_PARSE_INVALID_REQUEST;
|
|
749 }
|
|
750 while (*(u - 1) != '/') {
|
|
751 u--;
|
|
752 }
|
|
753 break;
|
|
754 case '%':
|
|
755 quoted_state = state;
|
|
756 state = sw_quoted;
|
|
757 break;
|
|
758 #if (WIN32)
|
|
759 case '.':
|
|
760 state = sw_dot_dot_dot;
|
|
761 *u++ = ch;
|
|
762 break;
|
|
763 #endif
|
|
764 default:
|
|
765 state = sw_usual;
|
|
766 *u++ = ch;
|
|
767 break;
|
|
768 }
|
|
769 ch = *p++;
|
|
770 break;
|
|
771
|
|
772 #if (WIN32)
|
|
773 case sw_dot_dot_dot:
|
|
774 switch(ch) {
|
|
775 case '/':
|
|
776 state = sw_slash;
|
|
777 u -= 5;
|
|
778 if (u < r->uri.data) {
|
|
779 return NGX_HTTP_PARSE_INVALID_REQUEST;
|
|
780 }
|
|
781 while (*u != '/') {
|
|
782 u--;
|
|
783 }
|
|
784 if (u < r->uri.data) {
|
|
785 return NGX_HTTP_PARSE_INVALID_REQUEST;
|
|
786 }
|
|
787 while (*(u - 1) != '/') {
|
|
788 u--;
|
|
789 }
|
|
790 break;
|
|
791 case '%':
|
|
792 quoted_state = state;
|
|
793 state = sw_quoted;
|
|
794 break;
|
|
795 default:
|
|
796 state = sw_usual;
|
|
797 *u++ = ch;
|
|
798 break;
|
|
799 }
|
|
800 ch = *p++;
|
|
801 break;
|
|
802 #endif
|
|
803
|
|
804 case sw_quoted:
|
|
805 if (ch >= '0' && ch <= '9') {
|
|
806 decoded = (u_char) (ch - '0');
|
|
807 state = sw_quoted_second;
|
|
808 ch = *p++;
|
|
809 break;
|
|
810 }
|
|
811
|
|
812 c = (u_char) (ch | 0x20);
|
|
813 if (c >= 'a' && c <= 'f') {
|
|
814 decoded = (u_char) (c - 'a' + 10);
|
|
815 state = sw_quoted_second;
|
|
816 ch = *p++;
|
|
817 break;
|
|
818 }
|
|
819
|
|
820 return NGX_HTTP_PARSE_INVALID_REQUEST;
|
|
821
|
|
822 case sw_quoted_second:
|
|
823 if (ch >= '0' && ch <= '9') {
|
|
824 ch = (u_char) ((decoded << 4) + ch - '0');
|
|
825 if (ch == '%') {
|
|
826 state = sw_usual;
|
|
827 *u++ = ch;
|
|
828 ch = *p++;
|
|
829 break;
|
|
830 }
|
|
831 state = quoted_state;
|
|
832 break;
|
|
833 }
|
|
834
|
|
835 c = (u_char) (ch | 0x20);
|
|
836 if (c >= 'a' && c <= 'f') {
|
|
837 ch = (u_char) ((decoded << 4) + c - 'a' + 10);
|
|
838 if (ch == '%') {
|
|
839 state = sw_usual;
|
|
840 *u++ = ch;
|
|
841 ch = *p++;
|
|
842 break;
|
|
843 }
|
|
844 state = quoted_state;
|
|
845 break;
|
|
846 }
|
|
847
|
|
848 return NGX_HTTP_PARSE_INVALID_REQUEST;
|
|
849 }
|
|
850 }
|
|
851
|
|
852 r->uri.len = u - r->uri.data;
|
|
853 r->uri.data[r->uri.len] = '\0';
|
|
854
|
|
855 if (r->uri_ext) {
|
|
856 r->exten.len = u - r->uri_ext;
|
|
857
|
|
858 if (!(r->exten.data = ngx_palloc(r->pool, r->exten.len + 1))) {
|
|
859 return NGX_HTTP_INTERNAL_SERVER_ERROR;
|
|
860 }
|
|
861
|
|
862 ngx_cpystrn(r->exten.data, r->uri_ext, r->exten.len + 1);
|
|
863 }
|
|
864
|
|
865 r->uri_ext = NULL;
|
|
866
|
|
867 return NGX_OK;
|
|
868 }
|