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2235
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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 typedef struct {
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13 ngx_flag_t enable;
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14 } ngx_http_random_index_loc_conf_t;
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15
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16
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17 #define NGX_HTTP_RANDOM_INDEX_PREALLOCATE 50
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18
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19
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20 static ngx_int_t ngx_http_random_index_error(ngx_http_request_t *r,
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21 ngx_dir_t *dir, ngx_str_t *name);
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22 static void *ngx_http_random_index_create_loc_conf(ngx_conf_t *cf);
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23 static char *ngx_http_random_index_merge_loc_conf(ngx_conf_t *cf,
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24 void *parent, void *child);
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2258
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25 static ngx_int_t ngx_http_random_index_add_variable(ngx_conf_t *cf);
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26 static ngx_int_t ngx_http_random_index_init(ngx_conf_t *cf);
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2235
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27
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28
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29 static ngx_command_t ngx_http_random_index_commands[] = {
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30
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31 { ngx_string("random_index"),
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32 NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
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33 ngx_conf_set_flag_slot,
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34 NGX_HTTP_LOC_CONF_OFFSET,
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35 offsetof(ngx_http_random_index_loc_conf_t, enable),
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36 NULL },
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37
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38 ngx_null_command
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39 };
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40
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41
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42 static ngx_http_module_t ngx_http_random_index_module_ctx = {
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2258
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43 ngx_http_random_index_add_variable, /* preconfiguration */
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2235
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44 ngx_http_random_index_init, /* postconfiguration */
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45
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46 NULL, /* create main configuration */
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47 NULL, /* init main configuration */
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48
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49 NULL, /* create server configuration */
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50 NULL, /* merge server configuration */
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51
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52 ngx_http_random_index_create_loc_conf, /* create location configration */
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53 ngx_http_random_index_merge_loc_conf /* merge location configration */
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54 };
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55
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56
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57 ngx_module_t ngx_http_random_index_module = {
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58 NGX_MODULE_V1,
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59 &ngx_http_random_index_module_ctx, /* module context */
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60 ngx_http_random_index_commands, /* module directives */
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61 NGX_HTTP_MODULE, /* module type */
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62 NULL, /* init master */
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63 NULL, /* init module */
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64 NULL, /* init process */
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65 NULL, /* init thread */
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66 NULL, /* exit thread */
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67 NULL, /* exit process */
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68 NULL, /* exit master */
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69 NGX_MODULE_V1_PADDING
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70 };
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71
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72
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2258
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73 static ngx_str_t ngx_http_random_index = ngx_string("random_index");
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74 static ngx_int_t ngx_random_index_variable_index;
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75
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76
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2235
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77 static ngx_int_t
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78 ngx_http_random_index_handler(ngx_http_request_t *r)
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79 {
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80 u_char *last, *filename;
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81 size_t len, allocated, root;
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82 ngx_err_t err;
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83 ngx_int_t rc;
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84 ngx_str_t path, uri, *name;
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85 ngx_dir_t dir;
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86 ngx_uint_t n, level;
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87 ngx_array_t names;
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2258
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88 ngx_http_variable_value_t *v;
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2235
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89 ngx_http_random_index_loc_conf_t *rlcf;
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90
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91 if (r->uri.data[r->uri.len - 1] != '/') {
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92 return NGX_DECLINED;
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93 }
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94
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95 /* TODO: Win32 */
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96 if (r->zero_in_uri) {
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97 return NGX_DECLINED;
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98 }
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99
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100 if (!(r->method & (NGX_HTTP_GET|NGX_HTTP_HEAD|NGX_HTTP_POST))) {
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101 return NGX_DECLINED;
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102 }
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103
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104 rlcf = ngx_http_get_module_loc_conf(r, ngx_http_random_index_module);
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105
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106 if (!rlcf->enable) {
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107 return NGX_DECLINED;
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108 }
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109
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110 #if (NGX_HAVE_D_TYPE)
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111 len = NGX_DIR_MASK_LEN;
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112 #else
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113 len = NGX_HTTP_RANDOM_INDEX_PREALLOCATE;
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114 #endif
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115
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116 last = ngx_http_map_uri_to_path(r, &path, &root, len);
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117 if (last == NULL) {
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118 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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119 }
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120
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121 allocated = path.len;
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122
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123 path.len = last - path.data - 1;
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124 path.data[path.len] = '\0';
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125
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126 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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127 "http random index: \"%s\"", path.data);
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128
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129 if (ngx_open_dir(&path, &dir) == NGX_ERROR) {
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130 err = ngx_errno;
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131
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132 if (err == NGX_ENOENT
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133 || err == NGX_ENOTDIR
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134 || err == NGX_ENAMETOOLONG)
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135 {
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136 level = NGX_LOG_ERR;
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137 rc = NGX_HTTP_NOT_FOUND;
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138
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139 } else if (err == NGX_EACCES) {
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140 level = NGX_LOG_ERR;
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141 rc = NGX_HTTP_FORBIDDEN;
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142
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143 } else {
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144 level = NGX_LOG_CRIT;
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145 rc = NGX_HTTP_INTERNAL_SERVER_ERROR;
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146 }
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147
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148 ngx_log_error(level, r->connection->log, err,
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149 ngx_open_dir_n " \"%s\" failed", path.data);
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150
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151 return rc;
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152 }
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153
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154 if (ngx_array_init(&names, r->pool, 32, sizeof(ngx_str_t)) != NGX_OK) {
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155 return ngx_http_random_index_error(r, &dir, &path);
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156 }
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157
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158 filename = path.data;
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159 filename[path.len] = '/';
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160
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161 for ( ;; ) {
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162 ngx_set_errno(0);
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163
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164 if (ngx_read_dir(&dir) == NGX_ERROR) {
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165 err = ngx_errno;
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166
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167 if (err != NGX_ENOMOREFILES) {
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168 ngx_log_error(NGX_LOG_CRIT, r->connection->log, err,
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169 ngx_read_dir_n " \"%V\" failed", &path);
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170 return ngx_http_random_index_error(r, &dir, &path);
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171 }
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172
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173 break;
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174 }
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175
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176 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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177 "http random index file: \"%s\"", ngx_de_name(&dir));
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178
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179 if (ngx_de_name(&dir)[0] == '.') {
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180 continue;
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181 }
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182
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183 len = ngx_de_namelen(&dir);
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184
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185 if (!dir.valid_type) {
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186
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187 /* 1 byte for '/' and 1 byte for terminating '\0' */
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188
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189 if (path.len + 1 + len + 1 > allocated) {
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190 allocated = path.len + 1 + len + 1
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191 + NGX_HTTP_RANDOM_INDEX_PREALLOCATE;
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192
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193 filename = ngx_pnalloc(r->pool, allocated);
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194 if (filename == NULL) {
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195 return ngx_http_random_index_error(r, &dir, &path);
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196 }
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197
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198 last = ngx_cpystrn(filename, path.data, path.len + 1);
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199 *last++ = '/';
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200 }
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201
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202 ngx_cpystrn(last, ngx_de_name(&dir), len + 1);
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203
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204 if (ngx_de_info(filename, &dir) == NGX_FILE_ERROR) {
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205 err = ngx_errno;
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206
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207 if (err != NGX_ENOENT) {
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208 ngx_log_error(NGX_LOG_CRIT, r->connection->log, err,
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209 ngx_de_info_n " \"%s\" failed", filename);
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210 return ngx_http_random_index_error(r, &dir, &path);
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211 }
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212
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213 if (ngx_de_link_info(filename, &dir) == NGX_FILE_ERROR) {
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214 ngx_log_error(NGX_LOG_CRIT, r->connection->log, ngx_errno,
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215 ngx_de_link_info_n " \"%s\" failed",
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216 filename);
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217 return ngx_http_random_index_error(r, &dir, &path);
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218 }
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219 }
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220 }
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221
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222 if (!ngx_de_is_file(&dir)) {
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223 continue;
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224 }
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225
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226 name = ngx_array_push(&names);
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227 if (name == NULL) {
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228 return ngx_http_random_index_error(r, &dir, &path);
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229 }
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230
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231 name->len = len;
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232
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233 name->data = ngx_pnalloc(r->pool, len);
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234 if (name->data == NULL) {
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235 return ngx_http_random_index_error(r, &dir, &path);
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236 }
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237
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238 ngx_memcpy(name->data, ngx_de_name(&dir), len);
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239 }
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240
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241 if (ngx_close_dir(&dir) == NGX_ERROR) {
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242 ngx_log_error(NGX_LOG_ALERT, r->connection->log, ngx_errno,
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243 ngx_close_dir_n " \"%s\" failed", &path);
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244 }
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245
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246 n = names.nelts;
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247
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248 if (n == 0) {
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249 return NGX_DECLINED;
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250 }
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251
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252 name = names.elts;
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253
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254 n = (ngx_uint_t) (((uint64_t) ngx_random() * n) / 0x80000000);
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255
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256 uri.len = r->uri.len + name[n].len;
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257
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258 uri.data = ngx_pnalloc(r->pool, uri.len);
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259 if (uri.data == NULL) {
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260 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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261 }
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262
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263 last = ngx_copy(uri.data, r->uri.data, r->uri.len);
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264 ngx_memcpy(last, name[n].data, name[n].len);
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265
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266 v = &r->variables[ngx_random_index_variable_index];
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267
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268 v->len = name[n].len;
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269 v->valid = 1;
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270 v->no_cacheable = 0;
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271 v->not_found = 0;
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272 v->data = name[n].data;
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273
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2235
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274 return ngx_http_internal_redirect(r, &uri, &r->args);
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275 }
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276
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277
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278 static ngx_int_t
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279 ngx_http_random_index_error(ngx_http_request_t *r, ngx_dir_t *dir,
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280 ngx_str_t *name)
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281 {
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282 if (ngx_close_dir(dir) == NGX_ERROR) {
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283 ngx_log_error(NGX_LOG_ALERT, r->connection->log, ngx_errno,
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284 ngx_close_dir_n " \"%V\" failed", name);
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285 }
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286
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287 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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288 }
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289
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290
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2258
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291 static ngx_int_t
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292 ngx_http_random_index_variable(ngx_http_request_t *r,
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293 ngx_http_variable_value_t *v, uintptr_t data)
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294 {
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295 /*
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296 * the "random_index" directive stores index file name directly inside
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297 * r->variables[] because request context is not preserved while
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298 * an internal redirection
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299 */
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300
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301 v->not_found = 1;
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302
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303 return NGX_OK;
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304 }
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305
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306
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2235
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307 static void *
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308 ngx_http_random_index_create_loc_conf(ngx_conf_t *cf)
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309 {
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310 ngx_http_random_index_loc_conf_t *conf;
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311
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312 conf = ngx_palloc(cf->pool, sizeof(ngx_http_random_index_loc_conf_t));
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313 if (conf == NULL) {
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314 return NGX_CONF_ERROR;
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315 }
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316
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317 conf->enable = NGX_CONF_UNSET;
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318
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319 return conf;
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320 }
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321
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322
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323 static char *
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324 ngx_http_random_index_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
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325 {
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326 ngx_http_random_index_loc_conf_t *prev = parent;
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327 ngx_http_random_index_loc_conf_t *conf = child;
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328
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329 ngx_conf_merge_value(conf->enable, prev->enable, 0);
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330
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331 return NGX_CONF_OK;
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332 }
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333
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334
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335 static ngx_int_t
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2258
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336 ngx_http_random_index_add_variable(ngx_conf_t *cf)
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337 {
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338 ngx_int_t index;
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339 ngx_http_variable_t *var;
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340
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341 var = ngx_http_add_variable(cf, &ngx_http_random_index,
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342 NGX_HTTP_VAR_NOHASH);
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343 if (var == NULL) {
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344 return NGX_ERROR;
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345 }
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346
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347 index = ngx_http_get_variable_index(cf, &ngx_http_random_index);
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348 if (index == NGX_ERROR) {
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349 return NGX_ERROR;
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350 }
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351
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352 ngx_random_index_variable_index = index;
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353
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354 var->get_handler = ngx_http_random_index_variable;
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355
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356 return NGX_OK;
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357 }
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358
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359
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360 static ngx_int_t
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2235
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361 ngx_http_random_index_init(ngx_conf_t *cf)
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362 {
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363 ngx_http_handler_pt *h;
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364 ngx_http_core_main_conf_t *cmcf;
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365
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366 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
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367
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368 h = ngx_array_push(&cmcf->phases[NGX_HTTP_CONTENT_PHASE].handlers);
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369 if (h == NULL) {
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370 return NGX_ERROR;
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371 }
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372
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373 *h = ngx_http_random_index_handler;
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374
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375 return NGX_OK;
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376 }
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