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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_event.h>
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10 #include <ngx_http.h>
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11
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12
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13 ngx_int_t
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14 ngx_http_config_add_hash(ngx_http_hash_conf_t *h, ngx_str_t *key, void *value,
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15 ngx_uint_t flags)
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16 {
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17 size_t len;
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18 ngx_str_t *name;
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19 ngx_uint_t i, k, n, skip;
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20 ngx_hash_key_t *hk;
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21 u_char buf[2048];
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22
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23 if (!(flags & NGX_HTTP_WILDCARD_HASH)) {
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24
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25 /* exact hash */
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26
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27 k = 0;
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28
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29 for (i = 0; i < key->len; i++) {
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30 key->data[i] = ngx_tolower(key->data[i]);
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31 k = ngx_hash(k, key->data[i]);
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32 }
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33
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34 k %= NGX_HTTP_CONFIG_HASH;
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35
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36 /* check conflicts in exact hash */
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37
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38 name = h->keys_hash[k].elts;
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39
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40 if (name) {
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41 for (i = 0; i < h->keys_hash[k].nelts; i++) {
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42 if (key->len != name[i].len) {
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43 continue;
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44 }
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45
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46 if (ngx_strncmp(key->data, name[i].data, key->len) == 0) {
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47 return NGX_BUSY;
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48 }
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49 }
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50
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51 } else {
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52 if (ngx_array_init(&h->keys_hash[k], h->temp_pool, 4,
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53 sizeof(ngx_str_t))
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54 != NGX_OK)
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55 {
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56 return NGX_ERROR;
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57 }
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58 }
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59
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60 name = ngx_array_push(&h->keys_hash[k]);
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61 if (name == NULL) {
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62 return NGX_ERROR;
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63 }
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64
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65 *name = *key;
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66
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67 hk = ngx_array_push(&h->keys);
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68 if (hk == NULL) {
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69 return NGX_ERROR;
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70 }
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71
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72 hk->key = *key;
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73 hk->key_hash = ngx_hash_key(key->data, key->len);
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74 hk->value = value;
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75
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76 } else {
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77
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78 /* wildcard hash */
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79
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80 skip = (key->data[0] == '*') ? 2 : 1;
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81 k = 0;
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82
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83 for (i = skip; i < key->len; i++) {
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84 key->data[i] = ngx_tolower(key->data[i]);
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85 k = ngx_hash(k, key->data[i]);
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86 }
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87
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88 k %= NGX_HTTP_CONFIG_HASH;
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89
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90 if (skip == 1) {
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91
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92 /* check conflicts in exact hash for ".example.com" */
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93
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94 name = h->keys_hash[k].elts;
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95
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96 if (name) {
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97 len = key->len - skip;
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98
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99 for (i = 0; i < h->keys_hash[k].nelts; i++) {
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100 if (len != name[i].len) {
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101 continue;
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102 }
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103
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104 if (ngx_strncmp(&key->data[1], name[i].data, len) == 0) {
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105 return NGX_BUSY;
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106 }
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107 }
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108
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109 } else {
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110 if (ngx_array_init(&h->keys_hash[k], h->temp_pool, 4,
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111 sizeof(ngx_str_t))
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112 != NGX_OK)
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113 {
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114 return NGX_ERROR;
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115 }
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116 }
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117
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118 name = ngx_array_push(&h->keys_hash[k]);
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119 if (name == NULL) {
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120 return NGX_ERROR;
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121 }
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122
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123 name->len = key->len - 1;
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124 name->data = ngx_palloc(h->temp_pool, name->len);
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125 if (name->data == NULL) {
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126 return NGX_ERROR;
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127 }
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128
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129 ngx_memcpy(name->data, &key->data[1], name->len);
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130 }
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131
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132
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133 /*
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134 * convert "*.example.com" to "com.example.\0"
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135 * and ".example.com" to "com.example\0"
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136 */
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137
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138 len = 0;
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139 n = 0;
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140
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141 for (i = key->len - 1; i; i--) {
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142 if (key->data[i] == '.') {
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143 ngx_memcpy(&buf[n], &key->data[i + 1], len);
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144 n += len;
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145 buf[n++] = '.';
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146 len = 0;
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147 continue;
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148 }
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149
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150 len++;
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151 }
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152
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153 if (len) {
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154 ngx_memcpy(&buf[n], &key->data[1], len);
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155 n += len;
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156 }
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157
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158 buf[n] = '\0';
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159
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160
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161 /* check conflicts in wildcard hash */
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162
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163 name = h->dns_hash[k].elts;
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164
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165 if (name) {
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166 len = key->len - skip;
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167
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168 for (i = 0; i < h->dns_hash[k].nelts; i++) {
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169 if (len != name[i].len) {
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170 continue;
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171 }
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172
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173 if (ngx_strncmp(key->data + skip, name[i].data, len) == 0) {
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174 return NGX_BUSY;
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175 }
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176 }
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177
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178 } else {
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179 if (ngx_array_init(&h->dns_hash[k], h->temp_pool, 4,
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180 sizeof(ngx_str_t))
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181 != NGX_OK)
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182 {
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183 return NGX_ERROR;
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184 }
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185 }
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186
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187 name = ngx_array_push(&h->dns_hash[k]);
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188 if (name == NULL) {
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189 return NGX_ERROR;
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190 }
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191
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192 name->len = key->len - skip;
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193 name->data = ngx_palloc(h->temp_pool, name->len);
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194 if (name->data == NULL) {
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195 return NGX_ERROR;
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196 }
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197 ngx_memcpy(name->data, key->data + skip, name->len);
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198
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199
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200 ngx_memcpy(key->data, buf, key->len);
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201 key->len--;
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202
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203 hk = ngx_array_push(&h->dns_wildcards);
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204 if (hk == NULL) {
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205 return NGX_ERROR;
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206 }
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207
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208 hk->key = *key;
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209 hk->key_hash = 0;
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210 hk->value = value;
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211 }
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212
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213 return NGX_OK;
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214 }
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