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700
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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 /*
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13 * The module can check browser versions conforming to the following formats:
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14 * X, X.X, X.X.X, and X.X.X.X. The maximum values of each format may be
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15 * 4000, 4000.99, 4000.99.99, and 4000.99.99.99.
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16 */
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17
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18
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19 typedef struct {
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20 u_char browser[12];
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21 size_t skip;
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22 size_t add;
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23 u_char name[12];
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24 } ngx_http_modern_browser_mask_t;
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25
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26
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27 typedef struct {
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28 ngx_uint_t version;
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29 size_t skip;
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30 size_t add;
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31 u_char name[12];
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32 } ngx_http_modern_browser_t;
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33
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34
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35 typedef struct {
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36 ngx_str_t name;
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37 ngx_http_get_variable_pt handler;
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38 } ngx_http_browser_t;
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39
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40
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41 typedef struct {
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42 ngx_array_t *modern_browsers;
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43 ngx_http_variable_value_t *value;
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44 } ngx_http_browser_conf_t;
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45
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46
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47 static ngx_int_t ngx_http_msie_variable(ngx_http_request_t *r,
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48 ngx_http_variable_value_t *v, uintptr_t data);
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49 static ngx_int_t ngx_http_browser_add_variable(ngx_conf_t *cf);
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50 static void *ngx_http_browser_create_conf(ngx_conf_t *cf);
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51 static char *ngx_http_browser_merge_conf(ngx_conf_t *cf, void *parent,
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52 void *child);
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53 static int ngx_libc_cdecl ngx_http_modern_browser_sort(const void *one,
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54 const void *two);
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55 static char *ngx_http_modern_browser(ngx_conf_t *cf, ngx_command_t *cmd,
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56 void *conf);
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57 static char *ngx_http_modern_browser_value(ngx_conf_t *cf, ngx_command_t *cmd,
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58 void *conf);
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59
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60
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61 static ngx_command_t ngx_http_browser_commands[] = {
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62
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63 { ngx_string("modern_browser"),
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64 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE2,
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65 ngx_http_modern_browser,
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66 NGX_HTTP_LOC_CONF_OFFSET,
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67 0,
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68 NULL },
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69
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70 { ngx_string("modern_browser_value"),
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71 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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72 ngx_http_modern_browser_value,
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73 NGX_HTTP_LOC_CONF_OFFSET,
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74 0,
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75 NULL },
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76
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77 ngx_null_command
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78 };
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79
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80
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81 static ngx_http_module_t ngx_http_browser_module_ctx = {
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82 ngx_http_browser_add_variable, /* preconfiguration */
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83 NULL, /* postconfiguration */
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84
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85 NULL, /* create main configuration */
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86 NULL, /* init main configuration */
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87
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88 NULL, /* create server configuration */
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89 NULL, /* merge server configuration */
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90
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91 ngx_http_browser_create_conf, /* create location configuration */
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92 ngx_http_browser_merge_conf /* merge location configuration */
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93 };
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94
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95
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96 ngx_module_t ngx_http_browser_module = {
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97 NGX_MODULE_V1,
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98 &ngx_http_browser_module_ctx, /* module context */
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99 ngx_http_browser_commands, /* module directives */
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100 NGX_HTTP_MODULE, /* module type */
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101 NULL, /* init master */
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102 NULL, /* init module */
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103 NULL, /* init process */
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104 NULL, /* init thread */
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105 NULL, /* exit thread */
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106 NULL, /* exit process */
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107 NULL, /* exit master */
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108 NGX_MODULE_V1_PADDING
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109 };
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110
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111
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112 static ngx_http_modern_browser_mask_t ngx_http_modern_browser_masks[] = {
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113
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114 /* Opera must be the first browser to check */
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115
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116 /*
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117 * "Opera/7.50 (X11; FreeBSD i386; U) [en]"
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118 * "Mozilla/5.0 (X11; FreeBSD i386; U) Opera 7.50 [en]"
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119 * "Mozilla/4.0 (compatible; MSIE 6.0; X11; FreeBSD i386) Opera 7.50 [en]"
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120 * "Opera/8.0 (Windows NT 5.1; U; ru)"
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121 * "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; en) Opera 8.0"
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122 * "Opera/9.01 (X11; FreeBSD 6 i386; U; en)"
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123 */
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124
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125 { "opera",
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126 0,
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127 sizeof("Opera ") - 1,
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128 "Opera"},
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129
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130 /* "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)" */
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131
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132 { "msie",
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133 sizeof("Mozilla/4.0 (compatible; ") - 1,
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134 sizeof("MSIE ") - 1,
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135 "MSIE "},
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136
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137 /*
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138 * "Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.0.0) Gecko/20020610"
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139 * "Mozilla/5.0 (Windows; U; Windows NT 5.1; ru-RU; rv:1.5) Gecko/20031006"
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140 * "Mozilla/5.0 (Windows; U; Windows NT 5.1; ru-RU; rv:1.6) Gecko/20040206
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141 * Firefox/0.8"
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142 * "Mozilla/5.0 (Windows; U; Windows NT 5.1; ru-RU; rv:1.7.8)
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143 * Gecko/20050511 Firefox/1.0.4"
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144 * "Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:1.8.0.5) Gecko/20060729
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145 * Firefox/1.5.0.5"
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146 */
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147
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148 { "gecko",
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149 sizeof("Mozilla/5.0 (") - 1,
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150 sizeof("rv:") - 1,
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151 "rv:"},
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152
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153 /*
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154 * "Mozilla/5.0 (Macintosh; U; PPC Mac OS X; ru-ru) AppleWebKit/125.2
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155 * (KHTML, like Gecko) Safari/125.7"
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156 * "Mozilla/5.0 (SymbianOS/9.1; U; en-us) AppleWebKit/413
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157 * (KHTML, like Gecko) Safari/413"
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158 * "Mozilla/5.0 (Macintosh; U; PPC Mac OS X; en) AppleWebKit/418
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159 * (KHTML, like Gecko) Safari/417.9.3"
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160 * "Mozilla/5.0 (Macintosh; U; PPC Mac OS X; ru-ru) AppleWebKit/418.8
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161 * (KHTML, like Gecko) Safari/419.3"
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162 */
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163
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164 { "safari",
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165 sizeof("Mozilla/5.0 (") - 1,
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166 sizeof("Safari/") - 1,
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167 "Safari/"},
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168
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169 /*
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170 * "Mozilla/5.0 (compatible; Konqueror/3.1; Linux)"
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171 * "Mozilla/5.0 (compatible; Konqueror/3.4; Linux) KHTML/3.4.2 (like Gecko)"
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172 * "Mozilla/5.0 (compatible; Konqueror/3.5; FreeBSD) KHTML/3.5.1
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173 * (like Gecko)"
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174 */
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175
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176 { "konqueror",
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177 sizeof("Mozilla/5.0 (compatible; ") - 1,
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178 sizeof("Konqueror/") - 1,
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179 "Konqueror/"},
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180
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181 { "", 0, 0, "" }
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182
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183 };
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184
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185
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186 static ngx_http_browser_t ngx_http_browsers[] = {
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187 { ngx_string("msie"), ngx_http_msie_variable },
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188 { ngx_null_string, NULL }
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189 };
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190
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191
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192 static ngx_int_t
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193 ngx_http_browser_variable(ngx_http_request_t *r, ngx_http_variable_value_t *v,
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194 uintptr_t data)
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195 {
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196 u_char *name, *ua, *last, c;
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197 ngx_uint_t i, version, ver, scale;
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198 ngx_http_browser_conf_t *cf;
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199 ngx_http_modern_browser_t *browsers;
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200
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201 cf = ngx_http_get_module_loc_conf(r, ngx_http_browser_module);
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202
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203 if (cf->modern_browsers == NULL || cf->value == NULL) {
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204 *v = ngx_http_variable_null_value;
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205 return NGX_OK;
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206 }
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207
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208 #if 0
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209 if (!r->headers_in.msie && !r->headers_in.opera
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210 && !r->headers_in.gecko && !r->headers_in.konqueror)
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211 {
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212 *v = ngx_http_variable_null_value;
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213 return NGX_OK;
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214 }
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215 #endif
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216
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217 if (r->headers_in.user_agent == NULL) {
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218 *v = ngx_http_variable_null_value;
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219 return NGX_OK;
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220 }
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221
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222
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223 ua = r->headers_in.user_agent->value.data;
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224 last = ua + r->headers_in.user_agent->value.len;
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225
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226 browsers = cf->modern_browsers->elts;
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227
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228 for (i = 0; i < cf->modern_browsers->nelts; i++) {
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229 name = ua + browsers[i].skip;
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230
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231 if (name >= last) {
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232 continue;
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233 }
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234
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235 name = (u_char *) ngx_strstr(name, browsers[i].name);
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236
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237 if (name == NULL) {
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238 continue;
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239 }
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240
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241 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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242 "browser: \"%s\"", name);
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243
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244 name += browsers[i].add;
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245
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246 if (name >= last) {
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247 *v = ngx_http_variable_null_value;
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248 }
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249
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250 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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251 "version: \"%ui\" \"%s\"", browsers[i].version, name);
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252
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253 version = 0;
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254 ver = 0;
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255 scale = 1000000;
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256
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257 while (name < last) {
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258
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259 c = *name++;
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260
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261 if (c >= '0' && c <= '9') {
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262 ver = ver * 10 + (c - '0');
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263 continue;
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264 }
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265
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266 if (c == '.') {
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267 version += ver * scale;
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268
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269 if (version > browsers[i].version) {
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270 *v = *cf->value;
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271 return NGX_OK;
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272 }
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273
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274 ver = 0;
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275 scale /= 100;
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276 continue;
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277 }
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278
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279 break;
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280 }
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281
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282 version += ver * scale;
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283
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284 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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285 "version: \"%ui\" \"%ui\"",
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286 browsers[i].version, version);
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287
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288 if (version >= browsers[i].version) {
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289 *v = *cf->value;
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290 return NGX_OK;
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291 }
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292 }
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293
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294 *v = ngx_http_variable_null_value;
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295
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296 return NGX_OK;
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297 }
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298
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299
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300 static ngx_int_t
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301 ngx_http_msie_variable(ngx_http_request_t *r, ngx_http_variable_value_t *v,
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302 uintptr_t data)
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303 {
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304 if (r->headers_in.msie) {
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305 *v = ngx_http_variable_true_value;
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306
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307 return NGX_OK;
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308 }
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309
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310 *v = ngx_http_variable_null_value;
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311
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312 return NGX_OK;
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313 }
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314
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315
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316 static ngx_int_t
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317 ngx_http_browser_add_variable(ngx_conf_t *cf)
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318 {
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319 ngx_http_browser_t *browser;
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320 ngx_http_variable_t *var;
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321
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322 for (browser = ngx_http_browsers; browser->name.len; browser++) {
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323
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324 var = ngx_http_add_variable(cf, &browser->name, NGX_HTTP_VAR_CHANGABLE);
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325 if (var == NULL) {
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326 return NGX_ERROR;
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327 }
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328
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329 var->get_handler = browser->handler;
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330 }
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331
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332 return NGX_OK;
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333 }
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334
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335
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336 static void *
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337 ngx_http_browser_create_conf(ngx_conf_t *cf)
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338 {
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339 ngx_http_browser_conf_t *conf;
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340
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341 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_browser_conf_t));
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342 if (conf == NULL) {
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343 return NGX_CONF_ERROR;
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344 }
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345
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346 /*
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347 * set by ngx_pcalloc():
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348 *
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349 * conf->browsers = NULL;
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350 * conf->value = NULL;
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351 */
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352
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353 return conf;
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354 }
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355
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356
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357 static char *
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358 ngx_http_browser_merge_conf(ngx_conf_t *cf, void *parent, void *child)
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359 {
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360 ngx_http_browser_conf_t *prev = parent;
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361 ngx_http_browser_conf_t *conf = child;
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362
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363 ngx_uint_t i, n;
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364 ngx_http_modern_browser_t *browsers, *opera;
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365
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366 /*
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367 * At the merge the skip field is used to store the browser slot,
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368 * it will be used in sorting and then will overwritten
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369 * with a real skip value. The zero value means Opera.
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370 */
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371
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372 if (conf->modern_browsers == NULL) {
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373 conf->modern_browsers = prev->modern_browsers;
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374
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375 } else {
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376 browsers = conf->modern_browsers->elts;
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377
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378 for (i = 0; i < conf->modern_browsers->nelts; i++) {
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379 if (browsers[i].skip == 0) {
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380 goto found;
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381 }
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382 }
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383
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384 /*
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385 * Opera may contain MSIE string, so if Opera was not enumerated
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386 * as modern browsers, then add it and set a unreachable version
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387 */
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388
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389 opera = ngx_array_push(conf->modern_browsers);
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390 if (opera == NULL) {
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391 return NGX_CONF_ERROR;
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392 }
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393
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394 opera->skip = 0;
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395 opera->version = 4001000000U;
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396
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397 browsers = conf->modern_browsers->elts;
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398
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399 found:
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400
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401 ngx_qsort(browsers, (size_t) conf->modern_browsers->nelts,
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402 sizeof(ngx_http_modern_browser_t),
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403 ngx_http_modern_browser_sort);
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404
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405 for (i = 0; i < conf->modern_browsers->nelts; i++) {
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406 n = browsers[i].skip;
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407
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408 browsers[i].skip = ngx_http_modern_browser_masks[n].skip;
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409 browsers[i].add = ngx_http_modern_browser_masks[n].add;
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410 (void) ngx_cpystrn(browsers[i].name,
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411 ngx_http_modern_browser_masks[n].name, 12);
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412 }
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413 }
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414
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415 if (conf->value == NULL) {
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416 conf->value = prev->value;
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417 }
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418
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419 return NGX_CONF_OK;
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420 }
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421
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422
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423 static int ngx_libc_cdecl
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424 ngx_http_modern_browser_sort(const void *one, const void *two)
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425 {
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426 ngx_http_modern_browser_t *first = (ngx_http_modern_browser_t *) one;
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427 ngx_http_modern_browser_t *second = (ngx_http_modern_browser_t *) two;
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428
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429 return (first->skip - second->skip);
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430 }
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431
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432
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433 static char *
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434 ngx_http_modern_browser(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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435 {
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436 ngx_http_browser_conf_t *bcf = conf;
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437
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438 u_char c;
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|
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439 ngx_str_t *value;
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440 ngx_uint_t i, n, version, ver, scale;
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441 ngx_http_modern_browser_t *browser;
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442 ngx_http_modern_browser_mask_t *mask;
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443
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444 if (bcf->modern_browsers == NULL) {
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445 bcf->modern_browsers = ngx_array_create(cf->pool, 4,
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|
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446 sizeof(ngx_http_modern_browser_t));
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|
|
447 if (bcf->modern_browsers == NULL) {
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|
|
448 return NGX_CONF_ERROR;
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|
|
449 }
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|
|
450 }
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|
|
451
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|
|
452 browser = ngx_array_push(bcf->modern_browsers);
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|
|
453 if (browser == NULL) {
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|
|
454 return NGX_CONF_ERROR;
|
|
|
455 }
|
|
|
456
|
|
|
457 value = cf->args->elts;
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|
|
458
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|
|
459 mask = ngx_http_modern_browser_masks;
|
|
|
460
|
|
|
461 for (n = 0; mask[n].browser[0] != '\0'; n++) {
|
|
|
462 if (ngx_strcasecmp(mask[n].browser, value[1].data) == 0) {
|
|
|
463 goto found;
|
|
|
464 }
|
|
|
465 }
|
|
|
466
|
|
|
467 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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|
|
468 "unknown browser name \"%V\"", &value[1]);
|
|
|
469
|
|
|
470 return NGX_CONF_ERROR;
|
|
|
471
|
|
|
472 found:
|
|
|
473
|
|
|
474 /*
|
|
|
475 * at this stage the skip field is used to store the browser slot,
|
|
|
476 * it will be used in sorting in merge stage and then will overwritten
|
|
|
477 * with a real value
|
|
|
478 */
|
|
|
479
|
|
|
480 browser->skip = n;
|
|
|
481
|
|
|
482 version = 0;
|
|
|
483 ver = 0;
|
|
|
484 scale = 1000000;
|
|
|
485
|
|
|
486 for (i = 0; i < value[2].len; i++) {
|
|
|
487
|
|
|
488 c = value[2].data[i];
|
|
|
489
|
|
|
490 if (c >= '0' && c <= '9') {
|
|
|
491 ver = ver * 10 + (c - '0');
|
|
|
492 continue;
|
|
|
493 }
|
|
|
494
|
|
|
495 if (c == '.') {
|
|
|
496 version += ver * scale;
|
|
|
497 ver = 0;
|
|
|
498 scale /= 100;
|
|
|
499 continue;
|
|
|
500 }
|
|
|
501
|
|
|
502 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
503 "invalid browser version \"%V\"", &value[2]);
|
|
|
504
|
|
|
505 return NGX_CONF_ERROR;
|
|
|
506 }
|
|
|
507
|
|
|
508 version += ver * scale;
|
|
|
509
|
|
|
510 ngx_conf_log_error(NGX_LOG_NOTICE, cf, 0,
|
|
|
511 "browser version \"%V\", %ui", &value[2], version);
|
|
|
512
|
|
|
513 browser->version = version;
|
|
|
514
|
|
|
515 return NGX_CONF_OK;
|
|
|
516 }
|
|
|
517
|
|
|
518
|
|
|
519 static char *
|
|
|
520 ngx_http_modern_browser_value(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
|
521 {
|
|
|
522 ngx_http_browser_conf_t *bcf = conf;
|
|
|
523
|
|
|
524 ngx_str_t *value, name;
|
|
|
525 ngx_http_variable_t *var;
|
|
|
526
|
|
|
527 value = cf->args->elts;
|
|
|
528
|
|
|
529 name.len = sizeof("browser") - 1;
|
|
|
530 name.data = (u_char *) "browser";
|
|
|
531
|
|
|
532 var = ngx_http_add_variable(cf, &name, NGX_HTTP_VAR_CHANGABLE);
|
|
|
533 if (var == NULL) {
|
|
|
534 return NGX_CONF_ERROR;
|
|
|
535 }
|
|
|
536
|
|
|
537 var->get_handler = ngx_http_browser_variable;
|
|
|
538
|
|
|
539 bcf->value = ngx_palloc(cf->pool, sizeof(ngx_http_variable_value_t));
|
|
|
540 if (bcf->value == NULL) {
|
|
|
541 return NGX_CONF_ERROR;
|
|
|
542 }
|
|
|
543
|
|
|
544 bcf->value->len = value[1].len;
|
|
|
545 bcf->value->valid = 1;
|
|
|
546 bcf->value->no_cachable = 0;
|
|
|
547 bcf->value->not_found = 0;
|
|
|
548 bcf->value->data = value[1].data;
|
|
|
549
|
|
|
550 return NGX_CONF_OK;
|
|
|
551 }
|
