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