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350
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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
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11
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12 #define NGX_RESOLVER_UDP_SIZE 4096
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13
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14
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15 typedef struct {
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16 u_char ident_hi;
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17 u_char ident_lo;
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18 u_char flags_hi;
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19 u_char flags_lo;
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20 u_char nqs_hi;
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21 u_char nqs_lo;
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22 u_char nan_hi;
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23 u_char nan_lo;
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24 u_char nns_hi;
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25 u_char nns_lo;
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26 u_char nar_hi;
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27 u_char nar_lo;
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28 } ngx_resolver_query_t;
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29
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30
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31 typedef struct {
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32 u_char type_hi;
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33 u_char type_lo;
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34 u_char class_hi;
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35 u_char class_lo;
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36 } ngx_resolver_qs_t;
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37
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38
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39 typedef struct {
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40 u_char type_hi;
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41 u_char type_lo;
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42 u_char class_hi;
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43 u_char class_lo;
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44 u_char ttl[4];
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45 u_char len_hi;
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46 u_char len_lo;
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47 } ngx_resolver_an_t;
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48
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49
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50 ngx_int_t ngx_udp_connect(ngx_udp_connection_t *uc);
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51
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52
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366
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53 static void ngx_resolver_cleanup(void *data);
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54 static void ngx_resolver_cleanup_tree(ngx_resolver_t *r, ngx_rbtree_t *tree);
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350
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55 static ngx_int_t ngx_resolve_name_locked(ngx_resolver_t *r,
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56 ngx_resolver_ctx_t *ctx);
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57 static void ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree,
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58 ngx_queue_t *queue);
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59 static ngx_int_t ngx_resolver_send_query(ngx_resolver_t *r,
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60 ngx_resolver_node_t *rn);
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61 static ngx_int_t ngx_resolver_create_name_query(ngx_resolver_node_t *rn,
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62 ngx_resolver_ctx_t *ctx);
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63 static ngx_int_t ngx_resolver_create_addr_query(ngx_resolver_node_t *rn,
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64 ngx_resolver_ctx_t *ctx);
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65 static void ngx_resolver_resend_handler(ngx_event_t *ev);
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66 static time_t ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree,
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67 ngx_queue_t *queue);
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68 static void ngx_resolver_read_response(ngx_event_t *rev);
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69 static void ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf,
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70 size_t n);
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71 static void ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t n,
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356
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72 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans);
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350
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73 static void ngx_resolver_process_ptr(ngx_resolver_t *r, u_char *buf, size_t n,
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356
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74 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan);
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350
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75 static ngx_resolver_node_t *ngx_resolver_lookup_name(ngx_resolver_t *r,
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76 ngx_str_t *name, uint32_t hash);
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77 static ngx_resolver_node_t *ngx_resolver_lookup_addr(ngx_resolver_t *r,
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78 in_addr_t addr);
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79 static void ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp,
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80 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel);
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81 static ngx_int_t ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name,
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82 u_char *buf, u_char *src, u_char *last);
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83 static void ngx_resolver_timeout_handler(ngx_event_t *ev);
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84 static void ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn);
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85 static void *ngx_resolver_alloc(ngx_resolver_t *r, size_t size);
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366
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86 static void *ngx_resolver_calloc(ngx_resolver_t *r, size_t size);
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350
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87 static void ngx_resolver_free(ngx_resolver_t *r, void *p);
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88 static void ngx_resolver_free_locked(ngx_resolver_t *r, void *p);
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89 static void *ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size);
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560
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90 static u_char *ngx_resolver_log_error(ngx_log_t *log, u_char *buf, size_t len);
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350
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91
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92
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93 ngx_resolver_t *
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646
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94 ngx_resolver_create(ngx_conf_t *cf, ngx_str_t *names, ngx_uint_t n)
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350
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95 {
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650
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96 ngx_str_t s;
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646
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97 ngx_url_t u;
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98 ngx_uint_t i;
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350
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99 ngx_resolver_t *r;
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366
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100 ngx_pool_cleanup_t *cln;
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350
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101 ngx_udp_connection_t *uc;
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102
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366
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103 cln = ngx_pool_cleanup_add(cf->pool, 0);
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104 if (cln == NULL) {
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105 return NULL;
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106 }
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107
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108 cln->handler = ngx_resolver_cleanup;
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109
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110 r = ngx_calloc(sizeof(ngx_resolver_t), cf->log);
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350
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111 if (r == NULL) {
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112 return NULL;
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113 }
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114
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646
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115 if (n) {
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116 if (ngx_array_init(&r->udp_connections, cf->pool, n,
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117 sizeof(ngx_udp_connection_t))
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118 != NGX_OK)
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119 {
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120 return NULL;
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121 }
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122 }
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123
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366
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124 cln->data = r;
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125
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126 r->event = ngx_calloc(sizeof(ngx_event_t), cf->log);
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350
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127 if (r->event == NULL) {
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128 return NULL;
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129 }
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130
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354
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131 ngx_rbtree_init(&r->name_rbtree, &r->name_sentinel,
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132 ngx_resolver_rbtree_insert_value);
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133
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134 ngx_rbtree_init(&r->addr_rbtree, &r->addr_sentinel,
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135 ngx_rbtree_insert_value);
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136
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137 ngx_queue_init(&r->name_resend_queue);
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138 ngx_queue_init(&r->addr_resend_queue);
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139
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140 ngx_queue_init(&r->name_expire_queue);
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141 ngx_queue_init(&r->addr_expire_queue);
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350
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142
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143 r->event->handler = ngx_resolver_resend_handler;
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144 r->event->data = r;
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484
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145 r->event->log = &cf->cycle->new_log;
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350
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146 r->ident = -1;
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147
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148 r->resend_timeout = 5;
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149 r->expire = 30;
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650
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150 r->valid = 0;
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350
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151
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484
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152 r->log = &cf->cycle->new_log;
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598
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153 r->log_level = NGX_LOG_ERR;
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350
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154
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646
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155 for (i = 0; i < n; i++) {
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650
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156 if (ngx_strncmp(names[i].data, "valid=", 6) == 0) {
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157 s.len = names[i].len - 6;
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158 s.data = names[i].data + 6;
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159
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160 r->valid = ngx_parse_time(&s, 1);
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161
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162 if (r->valid == NGX_ERROR) {
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163 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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164 "invalid parameter: %V", &names[i]);
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165 return NULL;
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166 }
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167
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168 continue;
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169 }
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170
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646
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171 ngx_memzero(&u, sizeof(ngx_url_t));
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172
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173 u.host = names[i];
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174 u.port = 53;
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175
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176 if (ngx_inet_resolve_host(cf->pool, &u) != NGX_OK) {
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177 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "%V: %s", &u.host, u.err);
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178 return NULL;
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179 }
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180
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181 uc = ngx_array_push(&r->udp_connections);
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354
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182 if (uc == NULL) {
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183 return NULL;
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184 }
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185
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646
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186 ngx_memzero(uc, sizeof(ngx_udp_connection_t));
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187
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188 uc->sockaddr = u.addrs->sockaddr;
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189 uc->socklen = u.addrs->socklen;
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190 uc->server = u.addrs->name;
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560
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191
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192 uc->log = cf->cycle->new_log;
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193 uc->log.handler = ngx_resolver_log_error;
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194 uc->log.data = uc;
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195 uc->log.action = "resolving";
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354
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196 }
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350
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197
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198 return r;
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199 }
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200
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201
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366
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202 static void
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203 ngx_resolver_cleanup(void *data)
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204 {
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205 ngx_resolver_t *r = data;
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206
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646
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207 ngx_uint_t i;
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208 ngx_udp_connection_t *uc;
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209
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366
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210 if (r) {
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211 ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0,
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212 "cleanup resolver");
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213
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214 ngx_resolver_cleanup_tree(r, &r->name_rbtree);
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215
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216 ngx_resolver_cleanup_tree(r, &r->addr_rbtree);
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217
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218 if (r->event) {
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219 ngx_free(r->event);
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220 }
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221
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646
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222
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223 uc = r->udp_connections.elts;
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224
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225 for (i = 0; i < r->udp_connections.nelts; i++) {
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226 if (uc[i].connection) {
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227 ngx_close_connection(uc[i].connection);
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366
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228 }
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229 }
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230
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231 ngx_free(r);
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232 }
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233 }
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234
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235
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236 static void
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237 ngx_resolver_cleanup_tree(ngx_resolver_t *r, ngx_rbtree_t *tree)
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238 {
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239 ngx_resolver_ctx_t *ctx, *next;
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240 ngx_resolver_node_t *rn;
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241
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242 while (tree->root != tree->sentinel) {
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243
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244 rn = (ngx_resolver_node_t *) ngx_rbtree_min(tree->root, tree->sentinel);
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245
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246 ngx_queue_remove(&rn->queue);
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247
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248 for (ctx = rn->waiting; ctx; ctx = next) {
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376
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249 next = ctx->next;
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366
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250
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251 if (ctx->event) {
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252 ngx_resolver_free(r, ctx->event);
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253 }
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254
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255 ngx_resolver_free(r, ctx);
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256 }
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257
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258 ngx_rbtree_delete(tree, &rn->node);
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259
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260 ngx_resolver_free_node(r, rn);
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261 }
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262 }
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263
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264
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350
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265 ngx_resolver_ctx_t *
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266 ngx_resolve_start(ngx_resolver_t *r, ngx_resolver_ctx_t *temp)
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267 {
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268 in_addr_t addr;
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269 ngx_resolver_ctx_t *ctx;
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270
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271 if (temp) {
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272 addr = ngx_inet_addr(temp->name.data, temp->name.len);
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273
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274 if (addr != INADDR_NONE) {
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275 temp->resolver = r;
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276 temp->state = NGX_OK;
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277 temp->naddrs = 1;
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278 temp->addrs = &temp->addr;
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279 temp->addr = addr;
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280 temp->quick = 1;
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281
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282 return temp;
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283 }
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284 }
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285
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646
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286 if (r->udp_connections.nelts == 0) {
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354
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287 return NGX_NO_RESOLVER;
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288 }
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289
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350
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290 ctx = ngx_resolver_calloc(r, sizeof(ngx_resolver_ctx_t));
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291
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292 if (ctx) {
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293 ctx->resolver = r;
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294 }
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295
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296 return ctx;
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297 }
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298
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299
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300 ngx_int_t
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301 ngx_resolve_name(ngx_resolver_ctx_t *ctx)
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302 {
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303 ngx_int_t rc;
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304 ngx_resolver_t *r;
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305
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306 r = ctx->resolver;
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307
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308 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0,
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309 "resolve: \"%V\"", &ctx->name);
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310
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311 if (ctx->quick) {
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312 ctx->handler(ctx);
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313 return NGX_OK;
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314 }
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315
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316 /* lock name mutex */
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317
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318 rc = ngx_resolve_name_locked(r, ctx);
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319
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320 if (rc == NGX_OK) {
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321 return NGX_OK;
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322 }
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323
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324 /* unlock name mutex */
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325
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326 if (rc == NGX_AGAIN) {
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327 return NGX_OK;
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328 }
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329
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366
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330 /* NGX_ERROR */
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350
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331
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332 if (ctx->event) {
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366
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333 ngx_resolver_free(r, ctx->event);
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350
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334 }
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335
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366
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336 ngx_resolver_free(r, ctx);
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350
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337
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338 return NGX_ERROR;
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339 }
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340
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341
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342 void
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343 ngx_resolve_name_done(ngx_resolver_ctx_t *ctx)
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344 {
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345 uint32_t hash;
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346 ngx_resolver_t *r;
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347 ngx_resolver_ctx_t *w, **p;
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348 ngx_resolver_node_t *rn;
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349
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350 r = ctx->resolver;
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351
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352 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0,
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353 "resolve name done: %i", ctx->state);
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354
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355 if (ctx->quick) {
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356 return;
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357 }
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358
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359 if (ctx->event && ctx->event->timer_set) {
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360 ngx_del_timer(ctx->event);
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361 }
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362
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363 /* lock name mutex */
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364
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365 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) {
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366
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367 hash = ngx_crc32_short(ctx->name.data, ctx->name.len);
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368
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369 rn = ngx_resolver_lookup_name(r, &ctx->name, hash);
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370
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371 if (rn) {
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372 p = &rn->waiting;
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373 w = rn->waiting;
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374
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375 while (w) {
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376 if (w == ctx) {
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377 *p = w->next;
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378
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379 goto done;
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380 }
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381
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382 p = &w->next;
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383 w = w->next;
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384 }
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385 }
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386
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387 ngx_log_error(NGX_LOG_ALERT, r->log, 0,
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388 "could not cancel %V resolving", &ctx->name);
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389 }
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390
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391 done:
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392
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393 ngx_resolver_expire(r, &r->name_rbtree, &r->name_expire_queue);
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394
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395 /* unlock name mutex */
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396
|
|
366
|
397 /* lock alloc mutex */
|
|
|
398
|
|
|
399 if (ctx->event) {
|
|
|
400 ngx_resolver_free_locked(r, ctx->event);
|
|
|
401 }
|
|
|
402
|
|
|
403 ngx_resolver_free_locked(r, ctx);
|
|
|
404
|
|
|
405 /* unlock alloc mutex */
|
|
350
|
406 }
|
|
|
407
|
|
|
408
|
|
|
409 /* NGX_RESOLVE_A only */
|
|
|
410
|
|
|
411 static ngx_int_t
|
|
|
412 ngx_resolve_name_locked(ngx_resolver_t *r, ngx_resolver_ctx_t *ctx)
|
|
|
413 {
|
|
|
414 uint32_t hash;
|
|
|
415 in_addr_t addr, *addrs;
|
|
372
|
416 ngx_int_t rc;
|
|
350
|
417 ngx_uint_t naddrs;
|
|
|
418 ngx_resolver_ctx_t *next;
|
|
|
419 ngx_resolver_node_t *rn;
|
|
|
420
|
|
|
421 hash = ngx_crc32_short(ctx->name.data, ctx->name.len);
|
|
|
422
|
|
|
423 rn = ngx_resolver_lookup_name(r, &ctx->name, hash);
|
|
|
424
|
|
|
425 if (rn) {
|
|
|
426
|
|
|
427 if (rn->valid >= ngx_time()) {
|
|
|
428
|
|
|
429 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached");
|
|
|
430
|
|
|
431 ngx_queue_remove(&rn->queue);
|
|
|
432
|
|
|
433 rn->expire = ngx_time() + r->expire;
|
|
|
434
|
|
|
435 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue);
|
|
|
436
|
|
|
437 naddrs = rn->naddrs;
|
|
|
438
|
|
|
439 if (naddrs) {
|
|
|
440
|
|
|
441 /* NGX_RESOLVE_A answer */
|
|
|
442
|
|
|
443 if (naddrs != 1) {
|
|
|
444 addr = 0;
|
|
|
445 addrs = ngx_resolver_dup(r, rn->u.addrs,
|
|
|
446 naddrs * sizeof(in_addr_t));
|
|
|
447 if (addrs == NULL) {
|
|
|
448 return NGX_ERROR;
|
|
|
449 }
|
|
|
450
|
|
|
451 } else {
|
|
|
452 addr = rn->u.addr;
|
|
|
453 addrs = NULL;
|
|
|
454 }
|
|
|
455
|
|
|
456 ctx->next = rn->waiting;
|
|
|
457 rn->waiting = NULL;
|
|
|
458
|
|
|
459 /* unlock name mutex */
|
|
|
460
|
|
|
461 do {
|
|
|
462 ctx->state = NGX_OK;
|
|
|
463 ctx->naddrs = naddrs;
|
|
|
464 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs;
|
|
|
465 ctx->addr = addr;
|
|
|
466 next = ctx->next;
|
|
|
467
|
|
|
468 ctx->handler(ctx);
|
|
|
469
|
|
|
470 ctx = next;
|
|
|
471 } while (ctx);
|
|
|
472
|
|
|
473 if (addrs) {
|
|
|
474 ngx_resolver_free(r, addrs);
|
|
|
475 }
|
|
|
476
|
|
|
477 return NGX_OK;
|
|
|
478 }
|
|
|
479
|
|
|
480 /* NGX_RESOLVE_CNAME */
|
|
|
481
|
|
372
|
482 if (ctx->recursion++ < NGX_RESOLVER_MAX_RECURSION) {
|
|
|
483
|
|
|
484 ctx->name.len = rn->cnlen;
|
|
|
485 ctx->name.data = rn->u.cname;
|
|
|
486
|
|
|
487 return ngx_resolve_name_locked(r, ctx);
|
|
|
488 }
|
|
|
489
|
|
|
490 ctx->next = rn->waiting;
|
|
|
491 rn->waiting = NULL;
|
|
|
492
|
|
|
493 /* unlock name mutex */
|
|
|
494
|
|
|
495 do {
|
|
|
496 ctx->state = NGX_RESOLVE_NXDOMAIN;
|
|
|
497 next = ctx->next;
|
|
|
498
|
|
|
499 ctx->handler(ctx);
|
|
|
500
|
|
|
501 ctx = next;
|
|
|
502 } while (ctx);
|
|
|
503
|
|
|
504 return NGX_OK;
|
|
350
|
505 }
|
|
|
506
|
|
|
507 if (rn->waiting) {
|
|
|
508
|
|
|
509 ctx->next = rn->waiting;
|
|
|
510 rn->waiting = ctx;
|
|
542
|
511 ctx->state = NGX_AGAIN;
|
|
350
|
512
|
|
|
513 return NGX_AGAIN;
|
|
|
514 }
|
|
|
515
|
|
|
516 ngx_queue_remove(&rn->queue);
|
|
|
517
|
|
|
518 /* lock alloc mutex */
|
|
|
519
|
|
|
520 ngx_resolver_free_locked(r, rn->query);
|
|
372
|
521 rn->query = NULL;
|
|
350
|
522
|
|
|
523 if (rn->cnlen) {
|
|
|
524 ngx_resolver_free_locked(r, rn->u.cname);
|
|
|
525 }
|
|
|
526
|
|
|
527 if (rn->naddrs > 1) {
|
|
|
528 ngx_resolver_free_locked(r, rn->u.addrs);
|
|
|
529 }
|
|
|
530
|
|
|
531 /* unlock alloc mutex */
|
|
|
532
|
|
|
533 } else {
|
|
|
534
|
|
|
535 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t));
|
|
|
536 if (rn == NULL) {
|
|
|
537 return NGX_ERROR;
|
|
|
538 }
|
|
|
539
|
|
|
540 rn->name = ngx_resolver_dup(r, ctx->name.data, ctx->name.len);
|
|
|
541 if (rn->name == NULL) {
|
|
|
542 ngx_resolver_free(r, rn);
|
|
|
543 return NGX_ERROR;
|
|
|
544 }
|
|
|
545
|
|
|
546 rn->node.key = hash;
|
|
|
547 rn->nlen = (u_short) ctx->name.len;
|
|
372
|
548 rn->query = NULL;
|
|
350
|
549
|
|
|
550 ngx_rbtree_insert(&r->name_rbtree, &rn->node);
|
|
|
551 }
|
|
|
552
|
|
372
|
553 rc = ngx_resolver_create_name_query(rn, ctx);
|
|
|
554
|
|
|
555 if (rc == NGX_ERROR) {
|
|
350
|
556 goto failed;
|
|
|
557 }
|
|
|
558
|
|
372
|
559 if (rc == NGX_DECLINED) {
|
|
|
560 ngx_rbtree_delete(&r->name_rbtree, &rn->node);
|
|
|
561
|
|
|
562 ngx_resolver_free(r, rn->query);
|
|
|
563 ngx_resolver_free(r, rn->name);
|
|
|
564 ngx_resolver_free(r, rn);
|
|
|
565
|
|
|
566 ctx->state = NGX_RESOLVE_NXDOMAIN;
|
|
|
567 ctx->handler(ctx);
|
|
|
568
|
|
|
569 return NGX_OK;
|
|
|
570 }
|
|
|
571
|
|
350
|
572 if (ngx_resolver_send_query(r, rn) != NGX_OK) {
|
|
|
573 goto failed;
|
|
|
574 }
|
|
|
575
|
|
|
576 if (ctx->event == NULL) {
|
|
|
577 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t));
|
|
|
578 if (ctx->event == NULL) {
|
|
|
579 goto failed;
|
|
|
580 }
|
|
|
581
|
|
|
582 ctx->event->handler = ngx_resolver_timeout_handler;
|
|
|
583 ctx->event->data = ctx;
|
|
|
584 ctx->event->log = r->log;
|
|
|
585 ctx->ident = -1;
|
|
|
586
|
|
|
587 ngx_add_timer(ctx->event, ctx->timeout);
|
|
|
588 }
|
|
|
589
|
|
|
590 if (ngx_queue_empty(&r->name_resend_queue)) {
|
|
|
591 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000));
|
|
|
592 }
|
|
|
593
|
|
|
594 rn->expire = ngx_time() + r->resend_timeout;
|
|
|
595
|
|
|
596 ngx_queue_insert_head(&r->name_resend_queue, &rn->queue);
|
|
|
597
|
|
|
598 rn->cnlen = 0;
|
|
|
599 rn->naddrs = 0;
|
|
|
600 rn->valid = 0;
|
|
|
601 rn->waiting = ctx;
|
|
|
602
|
|
|
603 ctx->state = NGX_AGAIN;
|
|
|
604
|
|
|
605 return NGX_AGAIN;
|
|
|
606
|
|
|
607 failed:
|
|
|
608
|
|
|
609 ngx_rbtree_delete(&r->name_rbtree, &rn->node);
|
|
|
610
|
|
372
|
611 if (rn->query) {
|
|
|
612 ngx_resolver_free(r, rn->query);
|
|
|
613 }
|
|
|
614
|
|
350
|
615 ngx_resolver_free(r, rn->name);
|
|
|
616
|
|
|
617 ngx_resolver_free(r, rn);
|
|
|
618
|
|
|
619 return NGX_ERROR;
|
|
|
620 }
|
|
|
621
|
|
|
622
|
|
|
623 ngx_int_t
|
|
|
624 ngx_resolve_addr(ngx_resolver_ctx_t *ctx)
|
|
|
625 {
|
|
442
|
626 u_char *name;
|
|
350
|
627 ngx_resolver_t *r;
|
|
|
628 ngx_resolver_node_t *rn;
|
|
|
629
|
|
|
630 r = ctx->resolver;
|
|
|
631
|
|
|
632 ctx->addr = ntohl(ctx->addr);
|
|
|
633
|
|
|
634 /* lock addr mutex */
|
|
|
635
|
|
|
636 rn = ngx_resolver_lookup_addr(r, ctx->addr);
|
|
|
637
|
|
|
638 if (rn) {
|
|
|
639
|
|
|
640 if (rn->valid >= ngx_time()) {
|
|
|
641
|
|
|
642 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached");
|
|
|
643
|
|
|
644 ngx_queue_remove(&rn->queue);
|
|
|
645
|
|
|
646 rn->expire = ngx_time() + r->expire;
|
|
|
647
|
|
|
648 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue);
|
|
|
649
|
|
442
|
650 name = ngx_resolver_dup(r, rn->name, rn->nlen);
|
|
|
651 if (name == NULL) {
|
|
350
|
652 goto failed;
|
|
|
653 }
|
|
|
654
|
|
442
|
655 ctx->name.len = rn->nlen;
|
|
|
656 ctx->name.data = name;
|
|
|
657
|
|
350
|
658 /* unlock addr mutex */
|
|
|
659
|
|
|
660 ctx->state = NGX_OK;
|
|
|
661
|
|
|
662 ctx->handler(ctx);
|
|
|
663
|
|
442
|
664 ngx_resolver_free(r, name);
|
|
350
|
665
|
|
|
666 return NGX_OK;
|
|
|
667 }
|
|
|
668
|
|
|
669 if (rn->waiting) {
|
|
|
670
|
|
|
671 ctx->next = rn->waiting;
|
|
|
672 rn->waiting = ctx;
|
|
542
|
673 ctx->state = NGX_AGAIN;
|
|
350
|
674
|
|
442
|
675 /* unlock addr mutex */
|
|
|
676
|
|
|
677 return NGX_OK;
|
|
350
|
678 }
|
|
|
679
|
|
|
680 ngx_queue_remove(&rn->queue);
|
|
|
681
|
|
|
682 ngx_resolver_free(r, rn->query);
|
|
372
|
683 rn->query = NULL;
|
|
350
|
684
|
|
|
685 } else {
|
|
|
686 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t));
|
|
|
687 if (rn == NULL) {
|
|
|
688 goto failed;
|
|
|
689 }
|
|
|
690
|
|
|
691 rn->node.key = ctx->addr;
|
|
372
|
692 rn->query = NULL;
|
|
350
|
693
|
|
|
694 ngx_rbtree_insert(&r->addr_rbtree, &rn->node);
|
|
|
695 }
|
|
|
696
|
|
|
697 if (ngx_resolver_create_addr_query(rn, ctx) != NGX_OK) {
|
|
|
698 goto failed;
|
|
|
699 }
|
|
|
700
|
|
|
701 if (ngx_resolver_send_query(r, rn) != NGX_OK) {
|
|
|
702 goto failed;
|
|
|
703 }
|
|
|
704
|
|
|
705 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t));
|
|
|
706 if (ctx->event == NULL) {
|
|
|
707 goto failed;
|
|
|
708 }
|
|
|
709
|
|
|
710 ctx->event->handler = ngx_resolver_timeout_handler;
|
|
|
711 ctx->event->data = ctx;
|
|
|
712 ctx->event->log = r->log;
|
|
|
713 ctx->ident = -1;
|
|
|
714
|
|
|
715 ngx_add_timer(ctx->event, ctx->timeout);
|
|
|
716
|
|
|
717 if (ngx_queue_empty(&r->addr_resend_queue)) {
|
|
|
718 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000));
|
|
|
719 }
|
|
|
720
|
|
|
721 rn->expire = ngx_time() + r->resend_timeout;
|
|
|
722
|
|
|
723 ngx_queue_insert_head(&r->addr_resend_queue, &rn->queue);
|
|
|
724
|
|
|
725 rn->cnlen = 0;
|
|
|
726 rn->naddrs = 0;
|
|
|
727 rn->name = NULL;
|
|
|
728 rn->nlen = 0;
|
|
|
729 rn->valid = 0;
|
|
|
730 rn->waiting = ctx;
|
|
|
731
|
|
|
732 /* unlock addr mutex */
|
|
|
733
|
|
|
734 ctx->state = NGX_AGAIN;
|
|
|
735
|
|
|
736 return NGX_OK;
|
|
|
737
|
|
|
738 failed:
|
|
|
739
|
|
|
740 if (rn) {
|
|
|
741 ngx_rbtree_delete(&r->addr_rbtree, &rn->node);
|
|
|
742
|
|
372
|
743 if (rn->query) {
|
|
|
744 ngx_resolver_free(r, rn->query);
|
|
|
745 }
|
|
|
746
|
|
350
|
747 ngx_resolver_free(r, rn);
|
|
|
748 }
|
|
|
749
|
|
|
750 /* unlock addr mutex */
|
|
|
751
|
|
|
752 if (ctx->event) {
|
|
366
|
753 ngx_resolver_free(r, ctx->event);
|
|
350
|
754 }
|
|
|
755
|
|
366
|
756 ngx_resolver_free(r, ctx);
|
|
350
|
757
|
|
|
758 return NGX_ERROR;
|
|
|
759 }
|
|
|
760
|
|
|
761
|
|
|
762 void
|
|
|
763 ngx_resolve_addr_done(ngx_resolver_ctx_t *ctx)
|
|
|
764 {
|
|
|
765 in_addr_t addr;
|
|
|
766 ngx_resolver_t *r;
|
|
|
767 ngx_resolver_ctx_t *w, **p;
|
|
|
768 ngx_resolver_node_t *rn;
|
|
|
769
|
|
|
770 r = ctx->resolver;
|
|
|
771
|
|
|
772 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0,
|
|
|
773 "resolve addr done: %i", ctx->state);
|
|
|
774
|
|
|
775 if (ctx->event && ctx->event->timer_set) {
|
|
|
776 ngx_del_timer(ctx->event);
|
|
|
777 }
|
|
|
778
|
|
|
779 /* lock addr mutex */
|
|
|
780
|
|
|
781 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) {
|
|
|
782
|
|
|
783 rn = ngx_resolver_lookup_addr(r, ctx->addr);
|
|
|
784
|
|
|
785 if (rn) {
|
|
|
786 p = &rn->waiting;
|
|
|
787 w = rn->waiting;
|
|
|
788
|
|
|
789 while (w) {
|
|
|
790 if (w == ctx) {
|
|
|
791 *p = w->next;
|
|
|
792
|
|
|
793 goto done;
|
|
|
794 }
|
|
|
795
|
|
|
796 p = &w->next;
|
|
|
797 w = w->next;
|
|
|
798 }
|
|
|
799 }
|
|
|
800
|
|
|
801 addr = ntohl(ctx->addr);
|
|
|
802
|
|
|
803 ngx_log_error(NGX_LOG_ALERT, r->log, 0,
|
|
|
804 "could not cancel %ud.%ud.%ud.%ud resolving",
|
|
|
805 (addr >> 24) & 0xff, (addr >> 16) & 0xff,
|
|
|
806 (addr >> 8) & 0xff, addr & 0xff);
|
|
|
807 }
|
|
|
808
|
|
|
809 done:
|
|
|
810
|
|
|
811 ngx_resolver_expire(r, &r->addr_rbtree, &r->addr_expire_queue);
|
|
|
812
|
|
|
813 /* unlock addr mutex */
|
|
|
814
|
|
366
|
815 /* lock alloc mutex */
|
|
|
816
|
|
|
817 if (ctx->event) {
|
|
|
818 ngx_resolver_free_locked(r, ctx->event);
|
|
|
819 }
|
|
|
820
|
|
|
821 ngx_resolver_free_locked(r, ctx);
|
|
|
822
|
|
|
823 /* unlock alloc mutex */
|
|
350
|
824 }
|
|
|
825
|
|
|
826
|
|
|
827 static void
|
|
|
828 ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue)
|
|
|
829 {
|
|
|
830 time_t now;
|
|
|
831 ngx_uint_t i;
|
|
|
832 ngx_queue_t *q;
|
|
|
833 ngx_resolver_node_t *rn;
|
|
|
834
|
|
|
835 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver expire");
|
|
|
836
|
|
|
837 now = ngx_time();
|
|
|
838
|
|
|
839 for (i = 0; i < 2; i++) {
|
|
|
840 if (ngx_queue_empty(queue)) {
|
|
|
841 return;
|
|
|
842 }
|
|
|
843
|
|
|
844 q = ngx_queue_last(queue);
|
|
|
845
|
|
|
846 rn = ngx_queue_data(q, ngx_resolver_node_t, queue);
|
|
|
847
|
|
|
848 if (now <= rn->expire) {
|
|
|
849 return;
|
|
|
850 }
|
|
|
851
|
|
358
|
852 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0,
|
|
|
853 "resolver expire \"%*s\"", (size_t) rn->nlen, rn->name);
|
|
350
|
854
|
|
|
855 ngx_queue_remove(q);
|
|
|
856
|
|
|
857 ngx_rbtree_delete(tree, &rn->node);
|
|
|
858
|
|
|
859 ngx_resolver_free_node(r, rn);
|
|
|
860 }
|
|
|
861 }
|
|
|
862
|
|
|
863
|
|
|
864 static ngx_int_t
|
|
|
865 ngx_resolver_send_query(ngx_resolver_t *r, ngx_resolver_node_t *rn)
|
|
|
866 {
|
|
|
867 ssize_t n;
|
|
|
868 ngx_udp_connection_t *uc;
|
|
|
869
|
|
646
|
870 uc = r->udp_connections.elts;
|
|
|
871
|
|
|
872 uc = &uc[r->last_connection++];
|
|
|
873 if (r->last_connection == r->udp_connections.nelts) {
|
|
|
874 r->last_connection = 0;
|
|
|
875 }
|
|
350
|
876
|
|
|
877 if (uc->connection == NULL) {
|
|
|
878 if (ngx_udp_connect(uc) != NGX_OK) {
|
|
|
879 return NGX_ERROR;
|
|
|
880 }
|
|
|
881
|
|
|
882 uc->connection->data = r;
|
|
|
883 uc->connection->read->handler = ngx_resolver_read_response;
|
|
366
|
884 uc->connection->read->resolver = 1;
|
|
350
|
885 }
|
|
|
886
|
|
|
887 n = ngx_send(uc->connection, rn->query, rn->qlen);
|
|
|
888
|
|
|
889 if (n == -1) {
|
|
|
890 return NGX_ERROR;
|
|
|
891 }
|
|
|
892
|
|
|
893 if ((size_t) n != (size_t) rn->qlen) {
|
|
560
|
894 ngx_log_error(NGX_LOG_CRIT, &uc->log, 0, "send() incomplete");
|
|
350
|
895 return NGX_ERROR;
|
|
|
896 }
|
|
|
897
|
|
|
898 return NGX_OK;
|
|
|
899 }
|
|
|
900
|
|
|
901
|
|
|
902 static void
|
|
|
903 ngx_resolver_resend_handler(ngx_event_t *ev)
|
|
|
904 {
|
|
|
905 time_t timer, atimer, ntimer;
|
|
|
906 ngx_resolver_t *r;
|
|
|
907
|
|
|
908 r = ev->data;
|
|
|
909
|
|
|
910 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0,
|
|
|
911 "resolver resend handler");
|
|
|
912
|
|
|
913 /* lock name mutex */
|
|
|
914
|
|
|
915 ntimer = ngx_resolver_resend(r, &r->name_rbtree, &r->name_resend_queue);
|
|
|
916
|
|
|
917 /* unlock name mutex */
|
|
|
918
|
|
|
919 /* lock addr mutex */
|
|
|
920
|
|
|
921 atimer = ngx_resolver_resend(r, &r->addr_rbtree, &r->addr_resend_queue);
|
|
354
|
922
|
|
350
|
923 /* unlock addr mutex */
|
|
|
924
|
|
|
925 if (ntimer == 0) {
|
|
|
926 timer = atimer;
|
|
|
927
|
|
|
928 } else if (atimer == 0) {
|
|
|
929 timer = ntimer;
|
|
|
930
|
|
|
931 } else {
|
|
|
932 timer = (atimer < ntimer) ? atimer : ntimer;
|
|
|
933 }
|
|
|
934
|
|
|
935 if (timer) {
|
|
|
936 ngx_add_timer(r->event, (ngx_msec_t) (timer * 1000));
|
|
|
937 }
|
|
|
938 }
|
|
|
939
|
|
|
940
|
|
|
941 static time_t
|
|
|
942 ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue)
|
|
|
943 {
|
|
|
944 time_t now;
|
|
|
945 ngx_queue_t *q;
|
|
|
946 ngx_resolver_node_t *rn;
|
|
|
947
|
|
|
948 now = ngx_time();
|
|
|
949
|
|
|
950 for ( ;; ) {
|
|
|
951 if (ngx_queue_empty(queue)) {
|
|
|
952 return 0;
|
|
|
953 }
|
|
|
954
|
|
|
955 q = ngx_queue_last(queue);
|
|
|
956
|
|
|
957 rn = ngx_queue_data(q, ngx_resolver_node_t, queue);
|
|
|
958
|
|
|
959 if (now < rn->expire) {
|
|
|
960 return rn->expire - now;
|
|
|
961 }
|
|
|
962
|
|
358
|
963 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0,
|
|
|
964 "resolver resend \"%*s\" %p",
|
|
|
965 (size_t) rn->nlen, rn->name, rn->waiting);
|
|
350
|
966
|
|
|
967 ngx_queue_remove(q);
|
|
|
968
|
|
|
969 if (rn->waiting) {
|
|
|
970
|
|
|
971 if (ngx_resolver_send_query(r, rn) == NGX_OK) {
|
|
|
972
|
|
|
973 rn->expire = now + r->resend_timeout;
|
|
|
974
|
|
|
975 ngx_queue_insert_head(queue, &rn->queue);
|
|
|
976 }
|
|
364
|
977
|
|
|
978 continue;
|
|
350
|
979 }
|
|
|
980
|
|
|
981 ngx_rbtree_delete(tree, &rn->node);
|
|
|
982
|
|
|
983 ngx_resolver_free_node(r, rn);
|
|
|
984 }
|
|
|
985 }
|
|
|
986
|
|
|
987
|
|
|
988 static void
|
|
|
989 ngx_resolver_read_response(ngx_event_t *rev)
|
|
|
990 {
|
|
|
991 ssize_t n;
|
|
|
992 ngx_connection_t *c;
|
|
|
993 u_char buf[NGX_RESOLVER_UDP_SIZE];
|
|
|
994
|
|
|
995 c = rev->data;
|
|
|
996
|
|
|
997 do {
|
|
354
|
998 n = ngx_udp_recv(c, buf, NGX_RESOLVER_UDP_SIZE);
|
|
|
999
|
|
|
1000 if (n < 0) {
|
|
350
|
1001 return;
|
|
|
1002 }
|
|
|
1003
|
|
|
1004 ngx_resolver_process_response(c->data, buf, n);
|
|
|
1005
|
|
|
1006 } while (rev->ready);
|
|
|
1007 }
|
|
|
1008
|
|
|
1009
|
|
|
1010 static void
|
|
|
1011 ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, size_t n)
|
|
|
1012 {
|
|
|
1013 char *err;
|
|
|
1014 size_t len;
|
|
416
|
1015 ngx_uint_t i, times, ident, qident, flags, code, nqs, nan,
|
|
|
1016 qtype, qclass;
|
|
|
1017 ngx_queue_t *q;
|
|
350
|
1018 ngx_resolver_qs_t *qs;
|
|
416
|
1019 ngx_resolver_node_t *rn;
|
|
350
|
1020 ngx_resolver_query_t *query;
|
|
|
1021
|
|
416
|
1022 if ((size_t) n < sizeof(ngx_resolver_query_t)) {
|
|
350
|
1023 goto short_response;
|
|
|
1024 }
|
|
|
1025
|
|
|
1026 query = (ngx_resolver_query_t *) buf;
|
|
|
1027
|
|
|
1028 ident = (query->ident_hi << 8) + query->ident_lo;
|
|
|
1029 flags = (query->flags_hi << 8) + query->flags_lo;
|
|
|
1030 nqs = (query->nqs_hi << 8) + query->nqs_lo;
|
|
|
1031 nan = (query->nan_hi << 8) + query->nan_lo;
|
|
|
1032
|
|
|
1033 ngx_log_debug6(NGX_LOG_DEBUG_CORE, r->log, 0,
|
|
372
|
1034 "resolver DNS response %ui fl:%04Xui %ui/%ui/%ui/%ui",
|
|
350
|
1035 ident, flags, nqs, nan,
|
|
|
1036 (query->nns_hi << 8) + query->nns_lo,
|
|
|
1037 (query->nar_hi << 8) + query->nar_lo);
|
|
|
1038
|
|
|
1039 if (!(flags & 0x8000)) {
|
|
|
1040 ngx_log_error(r->log_level, r->log, 0,
|
|
372
|
1041 "invalid DNS response %ui fl:%04Xui", ident, flags);
|
|
350
|
1042 return;
|
|
|
1043 }
|
|
|
1044
|
|
|
1045 code = flags & 0x7f;
|
|
|
1046
|
|
416
|
1047 if (code == NGX_RESOLVE_FORMERR) {
|
|
|
1048
|
|
|
1049 times = 0;
|
|
|
1050
|
|
|
1051 for (q = ngx_queue_head(&r->name_resend_queue);
|
|
|
1052 q != ngx_queue_sentinel(&r->name_resend_queue) || times++ < 100;
|
|
|
1053 q = ngx_queue_next(q))
|
|
|
1054 {
|
|
|
1055 rn = ngx_queue_data(q, ngx_resolver_node_t, queue);
|
|
|
1056 qident = (rn->query[0] << 8) + rn->query[1];
|
|
|
1057
|
|
|
1058 if (qident == ident) {
|
|
|
1059 ngx_log_error(r->log_level, r->log, 0,
|
|
|
1060 "DNS error (%ui: %s), query id:%ui, name:\"%*s\"",
|
|
|
1061 code, ngx_resolver_strerror(code), ident,
|
|
|
1062 rn->nlen, rn->name);
|
|
|
1063 return;
|
|
|
1064 }
|
|
|
1065 }
|
|
|
1066
|
|
|
1067 goto dns_error;
|
|
|
1068 }
|
|
|
1069
|
|
|
1070 if (code > NGX_RESOLVE_REFUSED) {
|
|
|
1071 goto dns_error;
|
|
350
|
1072 }
|
|
|
1073
|
|
|
1074 if (nqs != 1) {
|
|
|
1075 err = "invalid number of questions in DNS response";
|
|
|
1076 goto done;
|
|
|
1077 }
|
|
|
1078
|
|
|
1079 i = sizeof(ngx_resolver_query_t);
|
|
|
1080
|
|
|
1081 while (i < (ngx_uint_t) n) {
|
|
|
1082 if (buf[i] == '\0') {
|
|
|
1083 goto found;
|
|
|
1084 }
|
|
|
1085
|
|
|
1086 len = buf[i];
|
|
|
1087 i += 1 + len;
|
|
|
1088 }
|
|
|
1089
|
|
|
1090 goto short_response;
|
|
|
1091
|
|
|
1092 found:
|
|
|
1093
|
|
|
1094 if (i++ == 0) {
|
|
|
1095 err = "zero-length domain name in DNS response";
|
|
|
1096 goto done;
|
|
|
1097 }
|
|
|
1098
|
|
|
1099 if (i + sizeof(ngx_resolver_qs_t) + nan * (2 + sizeof(ngx_resolver_an_t))
|
|
|
1100 > (ngx_uint_t) n)
|
|
|
1101 {
|
|
|
1102 goto short_response;
|
|
|
1103 }
|
|
|
1104
|
|
|
1105 qs = (ngx_resolver_qs_t *) &buf[i];
|
|
|
1106
|
|
|
1107 qtype = (qs->type_hi << 8) + qs->type_lo;
|
|
|
1108 qclass = (qs->class_hi << 8) + qs->class_lo;
|
|
|
1109
|
|
|
1110 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0,
|
|
372
|
1111 "resolver DNS response qt:%ui cl:%ui", qtype, qclass);
|
|
350
|
1112
|
|
|
1113 if (qclass != 1) {
|
|
|
1114 ngx_log_error(r->log_level, r->log, 0,
|
|
372
|
1115 "unknown query class %ui in DNS response", qclass);
|
|
350
|
1116 return;
|
|
|
1117 }
|
|
|
1118
|
|
|
1119 switch (qtype) {
|
|
|
1120
|
|
|
1121 case NGX_RESOLVE_A:
|
|
|
1122
|
|
|
1123 ngx_resolver_process_a(r, buf, n, ident, code, nan,
|
|
356
|
1124 i + sizeof(ngx_resolver_qs_t));
|
|
350
|
1125
|
|
|
1126 break;
|
|
|
1127
|
|
|
1128 case NGX_RESOLVE_PTR:
|
|
|
1129
|
|
356
|
1130 ngx_resolver_process_ptr(r, buf, n, ident, code, nan);
|
|
350
|
1131
|
|
|
1132 break;
|
|
|
1133
|
|
|
1134 default:
|
|
|
1135 ngx_log_error(r->log_level, r->log, 0,
|
|
372
|
1136 "unknown query type %ui in DNS response", qtype);
|
|
350
|
1137 return;
|
|
|
1138 }
|
|
|
1139
|
|
|
1140 return;
|
|
|
1141
|
|
|
1142 short_response:
|
|
|
1143
|
|
|
1144 err = "short dns response";
|
|
|
1145
|
|
|
1146 done:
|
|
|
1147
|
|
|
1148 ngx_log_error(r->log_level, r->log, 0, err);
|
|
|
1149
|
|
|
1150 return;
|
|
416
|
1151
|
|
|
1152 dns_error:
|
|
|
1153
|
|
|
1154 ngx_log_error(r->log_level, r->log, 0,
|
|
|
1155 "DNS error (%ui: %s), query id:%ui",
|
|
|
1156 code, ngx_resolver_strerror(code), ident);
|
|
|
1157 return;
|
|
350
|
1158 }
|
|
|
1159
|
|
|
1160
|
|
|
1161 static void
|
|
|
1162 ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t last,
|
|
|
1163 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans)
|
|
|
1164 {
|
|
|
1165 char *err;
|
|
|
1166 u_char *cname;
|
|
|
1167 size_t len;
|
|
650
|
1168 int32_t ttl;
|
|
350
|
1169 uint32_t hash;
|
|
|
1170 in_addr_t addr, *addrs;
|
|
|
1171 ngx_str_t name;
|
|
|
1172 ngx_uint_t qtype, qident, naddrs, a, i, n, start;
|
|
|
1173 ngx_resolver_an_t *an;
|
|
|
1174 ngx_resolver_ctx_t *ctx, *next;
|
|
|
1175 ngx_resolver_node_t *rn;
|
|
|
1176
|
|
|
1177 if (ngx_resolver_copy(r, &name, buf, &buf[12], &buf[last]) != NGX_OK) {
|
|
|
1178 return;
|
|
|
1179 }
|
|
|
1180
|
|
|
1181 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver qs:%V", &name);
|
|
|
1182
|
|
|
1183 hash = ngx_crc32_short(name.data, name.len);
|
|
|
1184
|
|
|
1185 /* lock name mutex */
|
|
|
1186
|
|
|
1187 rn = ngx_resolver_lookup_name(r, &name, hash);
|
|
|
1188
|
|
|
1189 if (rn == NULL || rn->query == NULL) {
|
|
|
1190 ngx_log_error(r->log_level, r->log, 0,
|
|
|
1191 "unexpected response for %V", &name);
|
|
|
1192 goto failed;
|
|
|
1193 }
|
|
|
1194
|
|
|
1195 qident = (rn->query[0] << 8) + rn->query[1];
|
|
|
1196
|
|
|
1197 if (ident != qident) {
|
|
|
1198 ngx_log_error(r->log_level, r->log, 0,
|
|
372
|
1199 "wrong ident %ui response for %V, expect %ui",
|
|
350
|
1200 ident, &name, qident);
|
|
|
1201 goto failed;
|
|
|
1202 }
|
|
|
1203
|
|
528
|
1204 ngx_resolver_free(r, name.data);
|
|
|
1205
|
|
356
|
1206 if (code == 0 && nan == 0) {
|
|
|
1207 code = 3; /* NXDOMAIN */
|
|
|
1208 }
|
|
|
1209
|
|
350
|
1210 if (code) {
|
|
|
1211 next = rn->waiting;
|
|
|
1212 rn->waiting = NULL;
|
|
|
1213
|
|
|
1214 ngx_queue_remove(&rn->queue);
|
|
|
1215
|
|
|
1216 ngx_rbtree_delete(&r->name_rbtree, &rn->node);
|
|
|
1217
|
|
|
1218 ngx_resolver_free_node(r, rn);
|
|
|
1219
|
|
|
1220 /* unlock name mutex */
|
|
|
1221
|
|
|
1222 while (next) {
|
|
|
1223 ctx = next;
|
|
|
1224 ctx->state = code;
|
|
|
1225 next = ctx->next;
|
|
|
1226
|
|
|
1227 ctx->handler(ctx);
|
|
|
1228 }
|
|
|
1229
|
|
|
1230 return;
|
|
|
1231 }
|
|
|
1232
|
|
|
1233 i = ans;
|
|
|
1234 naddrs = 0;
|
|
|
1235 addr = 0;
|
|
|
1236 addrs = NULL;
|
|
|
1237 cname = NULL;
|
|
|
1238 qtype = 0;
|
|
650
|
1239 ttl = 0;
|
|
350
|
1240
|
|
|
1241 for (a = 0; a < nan; a++) {
|
|
|
1242
|
|
|
1243 start = i;
|
|
|
1244
|
|
|
1245 while (i < last) {
|
|
|
1246
|
|
|
1247 if (buf[i] & 0xc0) {
|
|
|
1248 i += 2;
|
|
|
1249 goto found;
|
|
|
1250 }
|
|
|
1251
|
|
|
1252 if (buf[i] == 0) {
|
|
|
1253 i++;
|
|
|
1254 goto test_length;
|
|
|
1255 }
|
|
|
1256
|
|
|
1257 i += 1 + buf[i];
|
|
|
1258 }
|
|
|
1259
|
|
|
1260 goto short_response;
|
|
|
1261
|
|
|
1262 test_length:
|
|
|
1263
|
|
|
1264 if (i - start < 2) {
|
|
|
1265 err = "invalid name in dns response";
|
|
|
1266 goto invalid;
|
|
|
1267 }
|
|
|
1268
|
|
|
1269 found:
|
|
|
1270
|
|
|
1271 if (i + sizeof(ngx_resolver_an_t) >= last) {
|
|
|
1272 goto short_response;
|
|
|
1273 }
|
|
|
1274
|
|
|
1275 an = (ngx_resolver_an_t *) &buf[i];
|
|
|
1276
|
|
|
1277 qtype = (an->type_hi << 8) + an->type_lo;
|
|
|
1278 len = (an->len_hi << 8) + an->len_lo;
|
|
650
|
1279 ttl = (an->ttl[0] << 24) + (an->ttl[1] << 16)
|
|
|
1280 + (an->ttl[2] << 8) + (an->ttl[3]);
|
|
|
1281
|
|
|
1282 if (ttl < 0) {
|
|
|
1283 ttl = 0;
|
|
|
1284 }
|
|
350
|
1285
|
|
|
1286 if (qtype == NGX_RESOLVE_A) {
|
|
|
1287
|
|
|
1288 i += sizeof(ngx_resolver_an_t);
|
|
|
1289
|
|
|
1290 if (i + len > last) {
|
|
|
1291 goto short_response;
|
|
|
1292 }
|
|
|
1293
|
|
|
1294 addr = htonl((buf[i] << 24) + (buf[i + 1] << 16)
|
|
|
1295 + (buf[i + 2] << 8) + (buf[i + 3]));
|
|
|
1296
|
|
|
1297 naddrs++;
|
|
|
1298
|
|
|
1299 i += len;
|
|
|
1300
|
|
|
1301 } else if (qtype == NGX_RESOLVE_CNAME) {
|
|
|
1302 cname = &buf[i] + sizeof(ngx_resolver_an_t);
|
|
|
1303 i += sizeof(ngx_resolver_an_t) + len;
|
|
372
|
1304
|
|
|
1305 } else if (qtype == NGX_RESOLVE_DNAME) {
|
|
|
1306 i += sizeof(ngx_resolver_an_t) + len;
|
|
|
1307
|
|
|
1308 } else {
|
|
|
1309 ngx_log_error(r->log_level, r->log, 0,
|
|
|
1310 "unexpected qtype %ui", qtype);
|
|
350
|
1311 }
|
|
|
1312 }
|
|
|
1313
|
|
650
|
1314 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0,
|
|
|
1315 "resolver naddrs:%ui cname:%p ttl:%d",
|
|
|
1316 naddrs, cname, ttl);
|
|
350
|
1317
|
|
|
1318 if (naddrs) {
|
|
|
1319
|
|
|
1320 if (naddrs == 1) {
|
|
|
1321 rn->u.addr = addr;
|
|
|
1322
|
|
|
1323 } else {
|
|
|
1324
|
|
|
1325 addrs = ngx_resolver_alloc(r, naddrs * sizeof(in_addr_t));
|
|
|
1326 if (addrs == NULL) {
|
|
|
1327 return;
|
|
|
1328 }
|
|
|
1329
|
|
|
1330 n = 0;
|
|
|
1331 i = ans;
|
|
|
1332
|
|
|
1333 for (a = 0; a < nan; a++) {
|
|
|
1334
|
|
|
1335 for ( ;; ) {
|
|
|
1336
|
|
|
1337 if (buf[i] & 0xc0) {
|
|
|
1338 i += 2;
|
|
|
1339 goto ok;
|
|
|
1340 }
|
|
|
1341
|
|
|
1342 if (buf[i] == 0) {
|
|
|
1343 i++;
|
|
|
1344 goto ok;
|
|
|
1345 }
|
|
|
1346
|
|
|
1347 i += 1 + buf[i];
|
|
|
1348 }
|
|
|
1349
|
|
|
1350 ok:
|
|
|
1351
|
|
|
1352 an = (ngx_resolver_an_t *) &buf[i];
|
|
|
1353
|
|
|
1354 qtype = (an->type_hi << 8) + an->type_lo;
|
|
|
1355 len = (an->len_hi << 8) + an->len_lo;
|
|
|
1356
|
|
|
1357 i += sizeof(ngx_resolver_an_t);
|
|
|
1358
|
|
|
1359 if (qtype == NGX_RESOLVE_A) {
|
|
|
1360
|
|
|
1361 addrs[n++] = htonl((buf[i] << 24) + (buf[i + 1] << 16)
|
|
|
1362 + (buf[i + 2] << 8) + (buf[i + 3]));
|
|
|
1363
|
|
|
1364 if (n == naddrs) {
|
|
|
1365 break;
|
|
|
1366 }
|
|
|
1367 }
|
|
|
1368
|
|
|
1369 i += len;
|
|
|
1370 }
|
|
|
1371
|
|
|
1372 rn->u.addrs = addrs;
|
|
|
1373
|
|
|
1374 addrs = ngx_resolver_dup(r, rn->u.addrs,
|
|
|
1375 naddrs * sizeof(in_addr_t));
|
|
|
1376 if (addrs == NULL) {
|
|
|
1377 return;
|
|
|
1378 }
|
|
|
1379 }
|
|
|
1380
|
|
|
1381 rn->naddrs = (u_short) naddrs;
|
|
|
1382
|
|
|
1383 ngx_queue_remove(&rn->queue);
|
|
|
1384
|
|
650
|
1385 rn->valid = ngx_time() + (r->valid ? r->valid : ttl);
|
|
350
|
1386 rn->expire = ngx_time() + r->expire;
|
|
|
1387
|
|
|
1388 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue);
|
|
|
1389
|
|
|
1390 next = rn->waiting;
|
|
|
1391 rn->waiting = NULL;
|
|
|
1392
|
|
|
1393 /* unlock name mutex */
|
|
|
1394
|
|
|
1395 while (next) {
|
|
|
1396 ctx = next;
|
|
|
1397 ctx->state = NGX_OK;
|
|
|
1398 ctx->naddrs = naddrs;
|
|
|
1399 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs;
|
|
|
1400 ctx->addr = addr;
|
|
|
1401 next = ctx->next;
|
|
|
1402
|
|
|
1403 ctx->handler(ctx);
|
|
|
1404 }
|
|
|
1405
|
|
442
|
1406 if (naddrs > 1) {
|
|
350
|
1407 ngx_resolver_free(r, addrs);
|
|
|
1408 }
|
|
|
1409
|
|
|
1410 return;
|
|
|
1411
|
|
|
1412 } else if (cname) {
|
|
|
1413
|
|
|
1414 /* CNAME only */
|
|
|
1415
|
|
|
1416 if (ngx_resolver_copy(r, &name, buf, cname, &buf[last]) != NGX_OK) {
|
|
|
1417 return;
|
|
|
1418 }
|
|
|
1419
|
|
|
1420 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0,
|
|
|
1421 "resolver cname:\"%V\"", &name);
|
|
|
1422
|
|
356
|
1423 ngx_queue_remove(&rn->queue);
|
|
|
1424
|
|
350
|
1425 rn->cnlen = (u_short) name.len;
|
|
|
1426 rn->u.cname = name.data;
|
|
650
|
1427
|
|
|
1428 rn->valid = ngx_time() + (r->valid ? r->valid : ttl);
|
|
350
|
1429 rn->expire = ngx_time() + r->expire;
|
|
|
1430
|
|
|
1431 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue);
|
|
|
1432
|
|
|
1433 ctx = rn->waiting;
|
|
|
1434 rn->waiting = NULL;
|
|
|
1435
|
|
|
1436 if (ctx) {
|
|
|
1437 ctx->name = name;
|
|
|
1438
|
|
|
1439 (void) ngx_resolve_name_locked(r, ctx);
|
|
|
1440 }
|
|
|
1441
|
|
|
1442 return;
|
|
|
1443 }
|
|
|
1444
|
|
|
1445 ngx_log_error(r->log_level, r->log, 0,
|
|
372
|
1446 "no A or CNAME types in DNS responses, unknown query type: %ui",
|
|
|
1447 qtype);
|
|
350
|
1448 return;
|
|
|
1449
|
|
|
1450 short_response:
|
|
|
1451
|
|
|
1452 err = "short dns response";
|
|
|
1453
|
|
|
1454 invalid:
|
|
|
1455
|
|
|
1456 /* unlock name mutex */
|
|
|
1457
|
|
|
1458 ngx_log_error(r->log_level, r->log, 0, err);
|
|
|
1459
|
|
|
1460 return;
|
|
|
1461
|
|
|
1462 failed:
|
|
|
1463
|
|
|
1464 /* unlock name mutex */
|
|
|
1465
|
|
528
|
1466 ngx_resolver_free(r, name.data);
|
|
|
1467
|
|
350
|
1468 return;
|
|
|
1469 }
|
|
|
1470
|
|
|
1471
|
|
|
1472 static void
|
|
|
1473 ngx_resolver_process_ptr(ngx_resolver_t *r, u_char *buf, size_t n,
|
|
356
|
1474 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan)
|
|
350
|
1475 {
|
|
|
1476 char *err;
|
|
|
1477 size_t len;
|
|
|
1478 in_addr_t addr;
|
|
650
|
1479 int32_t ttl;
|
|
350
|
1480 ngx_int_t digit;
|
|
|
1481 ngx_str_t name;
|
|
622
|
1482 ngx_uint_t i, mask, qident;
|
|
350
|
1483 ngx_resolver_an_t *an;
|
|
|
1484 ngx_resolver_ctx_t *ctx, *next;
|
|
|
1485 ngx_resolver_node_t *rn;
|
|
|
1486
|
|
|
1487 if (ngx_resolver_copy(r, NULL, buf, &buf[12], &buf[n]) != NGX_OK) {
|
|
|
1488 goto invalid_in_addr_arpa;
|
|
|
1489 }
|
|
|
1490
|
|
|
1491 addr = 0;
|
|
|
1492 i = 12;
|
|
|
1493
|
|
|
1494 for (mask = 0; mask < 32; mask += 8) {
|
|
|
1495 len = buf[i++];
|
|
|
1496
|
|
|
1497 digit = ngx_atoi(&buf[i], len);
|
|
|
1498 if (digit == NGX_ERROR || digit > 255) {
|
|
|
1499 goto invalid_in_addr_arpa;
|
|
|
1500 }
|
|
|
1501
|
|
|
1502 addr += digit << mask;
|
|
|
1503 i += len;
|
|
|
1504 }
|
|
|
1505
|
|
|
1506 if (ngx_strcmp(&buf[i], "\7in-addr\4arpa") != 0) {
|
|
|
1507 goto invalid_in_addr_arpa;
|
|
|
1508 }
|
|
|
1509
|
|
|
1510 /* lock addr mutex */
|
|
|
1511
|
|
|
1512 rn = ngx_resolver_lookup_addr(r, addr);
|
|
|
1513
|
|
|
1514 if (rn == NULL || rn->query == NULL) {
|
|
|
1515 ngx_log_error(r->log_level, r->log, 0,
|
|
|
1516 "unexpected response for %ud.%ud.%ud.%ud",
|
|
|
1517 (addr >> 24) & 0xff, (addr >> 16) & 0xff,
|
|
|
1518 (addr >> 8) & 0xff, addr & 0xff);
|
|
|
1519 goto failed;
|
|
|
1520 }
|
|
|
1521
|
|
|
1522 qident = (rn->query[0] << 8) + rn->query[1];
|
|
|
1523
|
|
|
1524 if (ident != qident) {
|
|
|
1525 ngx_log_error(r->log_level, r->log, 0,
|
|
372
|
1526 "wrong ident %ui response for %ud.%ud.%ud.%ud, expect %ui",
|
|
|
1527 ident, (addr >> 24) & 0xff, (addr >> 16) & 0xff,
|
|
|
1528 (addr >> 8) & 0xff, addr & 0xff, qident);
|
|
350
|
1529 goto failed;
|
|
|
1530 }
|
|
|
1531
|
|
356
|
1532 if (code == 0 && nan == 0) {
|
|
|
1533 code = 3; /* NXDOMAIN */
|
|
|
1534 }
|
|
|
1535
|
|
350
|
1536 if (code) {
|
|
|
1537 next = rn->waiting;
|
|
|
1538 rn->waiting = NULL;
|
|
|
1539
|
|
|
1540 ngx_queue_remove(&rn->queue);
|
|
|
1541
|
|
|
1542 ngx_rbtree_delete(&r->addr_rbtree, &rn->node);
|
|
|
1543
|
|
|
1544 ngx_resolver_free_node(r, rn);
|
|
|
1545
|
|
|
1546 /* unlock addr mutex */
|
|
|
1547
|
|
|
1548 while (next) {
|
|
|
1549 ctx = next;
|
|
|
1550 ctx->state = code;
|
|
|
1551 next = ctx->next;
|
|
|
1552
|
|
|
1553 ctx->handler(ctx);
|
|
|
1554 }
|
|
|
1555
|
|
|
1556 return;
|
|
|
1557 }
|
|
|
1558
|
|
|
1559 i += sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t);
|
|
|
1560
|
|
|
1561 if (i + 2 + sizeof(ngx_resolver_an_t) > (ngx_uint_t) n) {
|
|
|
1562 goto short_response;
|
|
|
1563 }
|
|
|
1564
|
|
|
1565 /* compression pointer to "XX.XX.XX.XX.in-addr.arpa */
|
|
|
1566
|
|
|
1567 if (buf[i] != 0xc0 || buf[i + 1] != 0x0c) {
|
|
|
1568 err = "invalid in-addr.arpa name in DNS response";
|
|
|
1569 goto invalid;
|
|
|
1570 }
|
|
|
1571
|
|
|
1572 an = (ngx_resolver_an_t *) &buf[i + 2];
|
|
|
1573
|
|
|
1574 len = (an->len_hi << 8) + an->len_lo;
|
|
650
|
1575 ttl = (an->ttl[0] << 24) + (an->ttl[1] << 16)
|
|
|
1576 + (an->ttl[2] << 8) + (an->ttl[3]);
|
|
|
1577
|
|
|
1578 if (ttl < 0) {
|
|
|
1579 ttl = 0;
|
|
|
1580 }
|
|
350
|
1581
|
|
|
1582 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0,
|
|
622
|
1583 "resolver qt:%ui cl:%ui len:%uz",
|
|
|
1584 (an->type_hi << 8) + an->type_lo,
|
|
|
1585 (an->class_hi << 8) + an->class_lo, len);
|
|
350
|
1586
|
|
|
1587 i += 2 + sizeof(ngx_resolver_an_t);
|
|
|
1588
|
|
|
1589 if (i + len > (ngx_uint_t) n) {
|
|
|
1590 goto short_response;
|
|
|
1591 }
|
|
|
1592
|
|
|
1593 if (ngx_resolver_copy(r, &name, buf, &buf[i], &buf[n]) != NGX_OK) {
|
|
|
1594 return;
|
|
|
1595 }
|
|
|
1596
|
|
|
1597 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver an:%V", &name);
|
|
|
1598
|
|
442
|
1599 if (name.len != (size_t) rn->nlen
|
|
|
1600 || ngx_strncmp(name.data, rn->name, name.len) != 0)
|
|
350
|
1601 {
|
|
442
|
1602 if (rn->nlen) {
|
|
|
1603 ngx_resolver_free(r, rn->name);
|
|
|
1604 }
|
|
|
1605
|
|
|
1606 rn->nlen = (u_short) name.len;
|
|
350
|
1607 rn->name = name.data;
|
|
|
1608
|
|
442
|
1609 name.data = ngx_resolver_dup(r, rn->name, name.len);
|
|
350
|
1610 if (name.data == NULL) {
|
|
|
1611 goto failed;
|
|
|
1612 }
|
|
|
1613 }
|
|
|
1614
|
|
|
1615 ngx_queue_remove(&rn->queue);
|
|
|
1616
|
|
650
|
1617 rn->valid = ngx_time() + (r->valid ? r->valid : ttl);
|
|
350
|
1618 rn->expire = ngx_time() + r->expire;
|
|
|
1619
|
|
|
1620 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue);
|
|
|
1621
|
|
|
1622 next = rn->waiting;
|
|
|
1623 rn->waiting = NULL;
|
|
|
1624
|
|
|
1625 /* unlock addr mutex */
|
|
|
1626
|
|
|
1627 while (next) {
|
|
|
1628 ctx = next;
|
|
|
1629 ctx->state = NGX_OK;
|
|
|
1630 ctx->name = name;
|
|
|
1631 next = ctx->next;
|
|
|
1632
|
|
|
1633 ctx->handler(ctx);
|
|
|
1634 }
|
|
|
1635
|
|
|
1636 ngx_resolver_free(r, name.data);
|
|
|
1637
|
|
|
1638 return;
|
|
|
1639
|
|
|
1640 invalid_in_addr_arpa:
|
|
|
1641
|
|
|
1642 ngx_log_error(r->log_level, r->log, 0,
|
|
|
1643 "invalid in-addr.arpa name in DNS response");
|
|
|
1644 return;
|
|
|
1645
|
|
|
1646 short_response:
|
|
|
1647
|
|
|
1648 err = "short DNS response";
|
|
|
1649
|
|
|
1650 invalid:
|
|
|
1651
|
|
|
1652 /* unlock addr mutex */
|
|
|
1653
|
|
|
1654 ngx_log_error(r->log_level, r->log, 0, err);
|
|
|
1655
|
|
|
1656 return;
|
|
|
1657
|
|
|
1658 failed:
|
|
|
1659
|
|
|
1660 /* unlock addr mutex */
|
|
|
1661
|
|
|
1662 return;
|
|
|
1663 }
|
|
|
1664
|
|
|
1665
|
|
|
1666 static ngx_resolver_node_t *
|
|
|
1667 ngx_resolver_lookup_name(ngx_resolver_t *r, ngx_str_t *name, uint32_t hash)
|
|
|
1668 {
|
|
|
1669 ngx_int_t rc;
|
|
|
1670 ngx_rbtree_node_t *node, *sentinel;
|
|
|
1671 ngx_resolver_node_t *rn;
|
|
|
1672
|
|
|
1673 node = r->name_rbtree.root;
|
|
|
1674 sentinel = r->name_rbtree.sentinel;
|
|
|
1675
|
|
|
1676 while (node != sentinel) {
|
|
|
1677
|
|
|
1678 if (hash < node->key) {
|
|
|
1679 node = node->left;
|
|
|
1680 continue;
|
|
|
1681 }
|
|
|
1682
|
|
|
1683 if (hash > node->key) {
|
|
|
1684 node = node->right;
|
|
|
1685 continue;
|
|
|
1686 }
|
|
|
1687
|
|
|
1688 /* hash == node->key */
|
|
|
1689
|
|
|
1690 do {
|
|
|
1691 rn = (ngx_resolver_node_t *) node;
|
|
|
1692
|
|
528
|
1693 rc = ngx_memn2cmp(name->data, rn->name, name->len, rn->nlen);
|
|
350
|
1694
|
|
|
1695 if (rc == 0) {
|
|
|
1696 return rn;
|
|
|
1697 }
|
|
|
1698
|
|
|
1699 node = (rc < 0) ? node->left : node->right;
|
|
|
1700
|
|
|
1701 } while (node != sentinel && hash == node->key);
|
|
|
1702
|
|
|
1703 break;
|
|
|
1704 }
|
|
|
1705
|
|
|
1706 /* not found */
|
|
|
1707
|
|
|
1708 return NULL;
|
|
|
1709 }
|
|
|
1710
|
|
|
1711
|
|
|
1712 static ngx_resolver_node_t *
|
|
|
1713 ngx_resolver_lookup_addr(ngx_resolver_t *r, in_addr_t addr)
|
|
|
1714 {
|
|
|
1715 ngx_rbtree_node_t *node, *sentinel;
|
|
|
1716
|
|
|
1717 node = r->addr_rbtree.root;
|
|
|
1718 sentinel = r->addr_rbtree.sentinel;
|
|
|
1719
|
|
|
1720 while (node != sentinel) {
|
|
|
1721
|
|
|
1722 if (addr < node->key) {
|
|
|
1723 node = node->left;
|
|
|
1724 continue;
|
|
|
1725 }
|
|
|
1726
|
|
|
1727 if (addr > node->key) {
|
|
|
1728 node = node->right;
|
|
|
1729 continue;
|
|
|
1730 }
|
|
|
1731
|
|
|
1732 /* addr == node->key */
|
|
|
1733
|
|
|
1734 return (ngx_resolver_node_t *) node;
|
|
|
1735 }
|
|
|
1736
|
|
|
1737 /* not found */
|
|
|
1738
|
|
|
1739 return NULL;
|
|
|
1740 }
|
|
|
1741
|
|
|
1742
|
|
|
1743 static void
|
|
|
1744 ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp,
|
|
|
1745 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel)
|
|
|
1746 {
|
|
|
1747 ngx_rbtree_node_t **p;
|
|
|
1748 ngx_resolver_node_t *rn, *rn_temp;
|
|
|
1749
|
|
|
1750 for ( ;; ) {
|
|
|
1751
|
|
|
1752 if (node->key < temp->key) {
|
|
|
1753
|
|
|
1754 p = &temp->left;
|
|
|
1755
|
|
|
1756 } else if (node->key > temp->key) {
|
|
|
1757
|
|
|
1758 p = &temp->right;
|
|
|
1759
|
|
|
1760 } else { /* node->key == temp->key */
|
|
|
1761
|
|
|
1762 rn = (ngx_resolver_node_t *) node;
|
|
|
1763 rn_temp = (ngx_resolver_node_t *) temp;
|
|
|
1764
|
|
528
|
1765 p = (ngx_memn2cmp(rn->name, rn_temp->name, rn->nlen, rn_temp->nlen)
|
|
|
1766 < 0) ? &temp->left : &temp->right;
|
|
350
|
1767 }
|
|
|
1768
|
|
|
1769 if (*p == sentinel) {
|
|
|
1770 break;
|
|
|
1771 }
|
|
|
1772
|
|
|
1773 temp = *p;
|
|
|
1774 }
|
|
|
1775
|
|
|
1776 *p = node;
|
|
|
1777 node->parent = temp;
|
|
|
1778 node->left = sentinel;
|
|
|
1779 node->right = sentinel;
|
|
|
1780 ngx_rbt_red(node);
|
|
|
1781 }
|
|
|
1782
|
|
|
1783
|
|
|
1784 static ngx_int_t
|
|
|
1785 ngx_resolver_create_name_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx)
|
|
|
1786 {
|
|
|
1787 u_char *p, *s;
|
|
544
|
1788 size_t len, nlen;
|
|
350
|
1789 ngx_uint_t ident;
|
|
|
1790 ngx_resolver_qs_t *qs;
|
|
|
1791 ngx_resolver_query_t *query;
|
|
|
1792
|
|
544
|
1793 nlen = ctx->name.len ? (1 + ctx->name.len + 1) : 1;
|
|
|
1794
|
|
|
1795 len = sizeof(ngx_resolver_query_t) + nlen + sizeof(ngx_resolver_qs_t);
|
|
|
1796
|
|
|
1797 p = ngx_resolver_alloc(ctx->resolver, len);
|
|
350
|
1798 if (p == NULL) {
|
|
|
1799 return NGX_ERROR;
|
|
|
1800 }
|
|
|
1801
|
|
|
1802 rn->qlen = (u_short) len;
|
|
|
1803 rn->query = p;
|
|
|
1804
|
|
|
1805 query = (ngx_resolver_query_t *) p;
|
|
|
1806
|
|
|
1807 ident = ngx_random();
|
|
|
1808
|
|
|
1809 ngx_log_debug2(NGX_LOG_DEBUG_CORE, ctx->resolver->log, 0,
|
|
|
1810 "resolve: \"%V\" %i", &ctx->name, ident & 0xffff);
|
|
|
1811
|
|
|
1812 query->ident_hi = (u_char) ((ident >> 8) & 0xff);
|
|
|
1813 query->ident_lo = (u_char) (ident & 0xff);
|
|
|
1814
|
|
|
1815 /* recursion query */
|
|
|
1816 query->flags_hi = 1; query->flags_lo = 0;
|
|
|
1817
|
|
|
1818 /* one question */
|
|
|
1819 query->nqs_hi = 0; query->nqs_lo = 1;
|
|
|
1820 query->nan_hi = 0; query->nan_lo = 0;
|
|
|
1821 query->nns_hi = 0; query->nns_lo = 0;
|
|
|
1822 query->nar_hi = 0; query->nar_lo = 0;
|
|
|
1823
|
|
544
|
1824 p += sizeof(ngx_resolver_query_t) + nlen;
|
|
350
|
1825
|
|
|
1826 qs = (ngx_resolver_qs_t *) p;
|
|
|
1827
|
|
|
1828 /* query type */
|
|
|
1829 qs->type_hi = 0; qs->type_lo = (u_char) ctx->type;
|
|
|
1830
|
|
|
1831 /* IP query class */
|
|
|
1832 qs->class_hi = 0; qs->class_lo = 1;
|
|
|
1833
|
|
|
1834 /* convert "www.example.com" to "\3www\7example\3com\0" */
|
|
|
1835
|
|
|
1836 len = 0;
|
|
|
1837 p--;
|
|
|
1838 *p-- = '\0';
|
|
|
1839
|
|
|
1840 for (s = ctx->name.data + ctx->name.len - 1; s >= ctx->name.data; s--) {
|
|
|
1841 if (*s != '.') {
|
|
|
1842 *p = *s;
|
|
|
1843 len++;
|
|
|
1844
|
|
|
1845 } else {
|
|
372
|
1846 if (len == 0) {
|
|
|
1847 return NGX_DECLINED;
|
|
|
1848 }
|
|
|
1849
|
|
350
|
1850 *p = (u_char) len;
|
|
|
1851 len = 0;
|
|
|
1852 }
|
|
|
1853
|
|
|
1854 p--;
|
|
|
1855 }
|
|
|
1856
|
|
|
1857 *p = (u_char) len;
|
|
|
1858
|
|
|
1859 return NGX_OK;
|
|
|
1860 }
|
|
|
1861
|
|
|
1862
|
|
|
1863 /* AF_INET only */
|
|
|
1864
|
|
|
1865 static ngx_int_t
|
|
|
1866 ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx)
|
|
|
1867 {
|
|
|
1868 u_char *p, *d;
|
|
|
1869 size_t len;
|
|
|
1870 ngx_int_t n;
|
|
|
1871 ngx_uint_t ident;
|
|
|
1872 ngx_resolver_query_t *query;
|
|
|
1873
|
|
|
1874 len = sizeof(ngx_resolver_query_t)
|
|
|
1875 + sizeof(".255.255.255.255.in-addr.arpa.") - 1
|
|
|
1876 + sizeof(ngx_resolver_qs_t);
|
|
|
1877
|
|
544
|
1878 p = ngx_resolver_alloc(ctx->resolver, len);
|
|
350
|
1879 if (p == NULL) {
|
|
|
1880 return NGX_ERROR;
|
|
|
1881 }
|
|
|
1882
|
|
|
1883 rn->query = p;
|
|
|
1884 query = (ngx_resolver_query_t *) p;
|
|
|
1885
|
|
|
1886 ident = ngx_random();
|
|
|
1887
|
|
|
1888 query->ident_hi = (u_char) ((ident >> 8) & 0xff);
|
|
|
1889 query->ident_lo = (u_char) (ident & 0xff);
|
|
|
1890
|
|
|
1891 /* recursion query */
|
|
|
1892 query->flags_hi = 1; query->flags_lo = 0;
|
|
|
1893
|
|
|
1894 /* one question */
|
|
|
1895 query->nqs_hi = 0; query->nqs_lo = 1;
|
|
|
1896 query->nan_hi = 0; query->nan_lo = 0;
|
|
|
1897 query->nns_hi = 0; query->nns_lo = 0;
|
|
|
1898 query->nar_hi = 0; query->nar_lo = 0;
|
|
|
1899
|
|
|
1900 p += sizeof(ngx_resolver_query_t);
|
|
|
1901
|
|
582
|
1902 for (n = 0; n < 32; n += 8) {
|
|
350
|
1903 d = ngx_sprintf(&p[1], "%ud", (ctx->addr >> n) & 0xff);
|
|
|
1904 *p = (u_char) (d - &p[1]);
|
|
|
1905 p = d;
|
|
|
1906 }
|
|
|
1907
|
|
|
1908 /* query type "PTR", IP query class */
|
|
|
1909 ngx_memcpy(p, "\7in-addr\4arpa\0\0\14\0\1", 18);
|
|
|
1910
|
|
|
1911 rn->qlen = (u_short)
|
|
|
1912 (p + sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t)
|
|
|
1913 - rn->query);
|
|
|
1914
|
|
|
1915 return NGX_OK;
|
|
|
1916 }
|
|
|
1917
|
|
|
1918
|
|
|
1919 static ngx_int_t
|
|
|
1920 ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, u_char *buf, u_char *src,
|
|
|
1921 u_char *last)
|
|
|
1922 {
|
|
|
1923 char *err;
|
|
|
1924 u_char *p, *dst;
|
|
|
1925 ssize_t len;
|
|
|
1926 ngx_uint_t i, n;
|
|
|
1927
|
|
|
1928 p = src;
|
|
|
1929 len = -1;
|
|
|
1930
|
|
|
1931 /*
|
|
|
1932 * compression pointers allow to create endless loop, so we set limit;
|
|
|
1933 * 128 pointers should be enough to store 255-byte name
|
|
|
1934 */
|
|
|
1935
|
|
|
1936 for (i = 0; i < 128; i++) {
|
|
|
1937 n = *p++;
|
|
|
1938
|
|
|
1939 if (n == 0) {
|
|
|
1940 goto done;
|
|
|
1941 }
|
|
|
1942
|
|
|
1943 if (n & 0xc0) {
|
|
420
|
1944 n = ((n & 0x3f) << 8) + *p;
|
|
350
|
1945 p = &buf[n];
|
|
|
1946
|
|
|
1947 } else {
|
|
|
1948 len += 1 + n;
|
|
|
1949 p = &p[n];
|
|
|
1950 }
|
|
|
1951
|
|
|
1952 if (p >= last) {
|
|
|
1953 err = "name is out of response";
|
|
|
1954 goto invalid;
|
|
|
1955 }
|
|
|
1956 }
|
|
|
1957
|
|
|
1958 err = "compression pointers loop";
|
|
|
1959
|
|
|
1960 invalid:
|
|
|
1961
|
|
|
1962 ngx_log_error(r->log_level, r->log, 0, err);
|
|
|
1963
|
|
|
1964 return NGX_ERROR;
|
|
|
1965
|
|
|
1966 done:
|
|
|
1967
|
|
|
1968 if (name == NULL) {
|
|
|
1969 return NGX_OK;
|
|
|
1970 }
|
|
|
1971
|
|
542
|
1972 if (len == -1) {
|
|
|
1973 name->len = 0;
|
|
|
1974 name->data = NULL;
|
|
|
1975 return NGX_OK;
|
|
|
1976 }
|
|
|
1977
|
|
350
|
1978 dst = ngx_resolver_alloc(r, len);
|
|
|
1979 if (dst == NULL) {
|
|
|
1980 return NGX_ERROR;
|
|
|
1981 }
|
|
|
1982
|
|
|
1983 name->data = dst;
|
|
|
1984
|
|
|
1985 n = *src++;
|
|
|
1986
|
|
|
1987 for ( ;; ) {
|
|
648
|
1988 if (n & 0xc0) {
|
|
|
1989 n = ((n & 0x3f) << 8) + *src;
|
|
|
1990 src = &buf[n];
|
|
|
1991
|
|
|
1992 n = *src++;
|
|
|
1993
|
|
|
1994 } else {
|
|
350
|
1995 ngx_memcpy(dst, src, n);
|
|
|
1996 dst += n;
|
|
|
1997 src += n;
|
|
|
1998
|
|
|
1999 n = *src++;
|
|
|
2000
|
|
|
2001 if (n != 0) {
|
|
|
2002 *dst++ = '.';
|
|
|
2003 }
|
|
|
2004 }
|
|
|
2005
|
|
|
2006 if (n == 0) {
|
|
|
2007 name->len = dst - name->data;
|
|
|
2008 return NGX_OK;
|
|
|
2009 }
|
|
|
2010 }
|
|
|
2011 }
|
|
|
2012
|
|
|
2013
|
|
|
2014 static void
|
|
|
2015 ngx_resolver_timeout_handler(ngx_event_t *ev)
|
|
|
2016 {
|
|
|
2017 ngx_resolver_ctx_t *ctx;
|
|
|
2018
|
|
|
2019 ctx = ev->data;
|
|
|
2020
|
|
|
2021 ctx->state = NGX_RESOLVE_TIMEDOUT;
|
|
|
2022
|
|
|
2023 ctx->handler(ctx);
|
|
|
2024 }
|
|
|
2025
|
|
|
2026
|
|
|
2027 static void
|
|
|
2028 ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn)
|
|
|
2029 {
|
|
|
2030 /* lock alloc mutex */
|
|
|
2031
|
|
|
2032 if (rn->query) {
|
|
|
2033 ngx_resolver_free_locked(r, rn->query);
|
|
|
2034 }
|
|
|
2035
|
|
|
2036 if (rn->name) {
|
|
|
2037 ngx_resolver_free_locked(r, rn->name);
|
|
|
2038 }
|
|
|
2039
|
|
|
2040 if (rn->cnlen) {
|
|
|
2041 ngx_resolver_free_locked(r, rn->u.cname);
|
|
|
2042 }
|
|
|
2043
|
|
|
2044 if (rn->naddrs > 1) {
|
|
|
2045 ngx_resolver_free_locked(r, rn->u.addrs);
|
|
|
2046 }
|
|
|
2047
|
|
|
2048 ngx_resolver_free_locked(r, rn);
|
|
|
2049
|
|
|
2050 /* unlock alloc mutex */
|
|
|
2051 }
|
|
|
2052
|
|
|
2053
|
|
|
2054 static void *
|
|
|
2055 ngx_resolver_alloc(ngx_resolver_t *r, size_t size)
|
|
|
2056 {
|
|
|
2057 u_char *p;
|
|
|
2058
|
|
|
2059 /* lock alloc mutex */
|
|
|
2060
|
|
|
2061 p = ngx_alloc(size, r->log);
|
|
|
2062
|
|
|
2063 /* unlock alloc mutex */
|
|
|
2064
|
|
|
2065 return p;
|
|
|
2066 }
|
|
|
2067
|
|
|
2068
|
|
366
|
2069 static void *
|
|
350
|
2070 ngx_resolver_calloc(ngx_resolver_t *r, size_t size)
|
|
|
2071 {
|
|
|
2072 u_char *p;
|
|
|
2073
|
|
|
2074 p = ngx_resolver_alloc(r, size);
|
|
|
2075
|
|
|
2076 if (p) {
|
|
|
2077 ngx_memzero(p, size);
|
|
|
2078 }
|
|
|
2079
|
|
|
2080 return p;
|
|
|
2081 }
|
|
|
2082
|
|
|
2083
|
|
|
2084 static void
|
|
|
2085 ngx_resolver_free(ngx_resolver_t *r, void *p)
|
|
|
2086 {
|
|
|
2087 /* lock alloc mutex */
|
|
|
2088
|
|
|
2089 ngx_free(p);
|
|
|
2090
|
|
|
2091 /* unlock alloc mutex */
|
|
|
2092 }
|
|
|
2093
|
|
|
2094
|
|
|
2095 static void
|
|
|
2096 ngx_resolver_free_locked(ngx_resolver_t *r, void *p)
|
|
|
2097 {
|
|
|
2098 ngx_free(p);
|
|
|
2099 }
|
|
|
2100
|
|
|
2101
|
|
|
2102 static void *
|
|
|
2103 ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size)
|
|
|
2104 {
|
|
|
2105 void *dst;
|
|
|
2106
|
|
|
2107 dst = ngx_resolver_alloc(r, size);
|
|
|
2108
|
|
|
2109 if (dst == NULL) {
|
|
|
2110 return dst;
|
|
|
2111 }
|
|
|
2112
|
|
|
2113 ngx_memcpy(dst, src, size);
|
|
|
2114
|
|
|
2115 return dst;
|
|
|
2116 }
|
|
|
2117
|
|
|
2118
|
|
|
2119 char *
|
|
|
2120 ngx_resolver_strerror(ngx_int_t err)
|
|
|
2121 {
|
|
|
2122 static char *errors[] = {
|
|
|
2123 "Format error", /* FORMERR */
|
|
|
2124 "Server failure", /* SERVFAIL */
|
|
|
2125 "Host not found", /* NXDOMAIN */
|
|
|
2126 "Unimplemented", /* NOTIMP */
|
|
|
2127 "Operation refused" /* REFUSED */
|
|
|
2128 };
|
|
|
2129
|
|
|
2130 if (err > 0 && err < 6) {
|
|
|
2131 return errors[err - 1];
|
|
|
2132 }
|
|
|
2133
|
|
|
2134 if (err == NGX_RESOLVE_TIMEDOUT) {
|
|
|
2135 return "Operation timed out";
|
|
|
2136 }
|
|
|
2137
|
|
|
2138 return "Unknown error";
|
|
|
2139 }
|
|
|
2140
|
|
|
2141
|
|
560
|
2142 static u_char *
|
|
|
2143 ngx_resolver_log_error(ngx_log_t *log, u_char *buf, size_t len)
|
|
|
2144 {
|
|
|
2145 u_char *p;
|
|
|
2146 ngx_udp_connection_t *uc;
|
|
|
2147
|
|
|
2148 p = buf;
|
|
|
2149
|
|
|
2150 if (log->action) {
|
|
|
2151 p = ngx_snprintf(buf, len, " while %s", log->action);
|
|
|
2152 len -= p - buf;
|
|
|
2153 }
|
|
|
2154
|
|
|
2155 uc = log->data;
|
|
|
2156
|
|
|
2157 if (uc) {
|
|
|
2158 p = ngx_snprintf(p, len, ", resolver: %V", &uc->server);
|
|
|
2159 }
|
|
|
2160
|
|
|
2161 return p;
|
|
|
2162 }
|
|
|
2163
|
|
|
2164
|
|
350
|
2165 ngx_int_t
|
|
|
2166 ngx_udp_connect(ngx_udp_connection_t *uc)
|
|
|
2167 {
|
|
|
2168 int rc;
|
|
|
2169 ngx_int_t event;
|
|
|
2170 ngx_event_t *rev, *wev;
|
|
|
2171 ngx_socket_t s;
|
|
|
2172 ngx_connection_t *c;
|
|
|
2173
|
|
|
2174 s = ngx_socket(AF_INET, SOCK_DGRAM, 0);
|
|
|
2175
|
|
560
|
2176 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, &uc->log, 0, "UDP socket %d", s);
|
|
350
|
2177
|
|
|
2178 if (s == -1) {
|
|
560
|
2179 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno,
|
|
350
|
2180 ngx_socket_n " failed");
|
|
|
2181 return NGX_ERROR;
|
|
|
2182 }
|
|
|
2183
|
|
560
|
2184 c = ngx_get_connection(s, &uc->log);
|
|
350
|
2185
|
|
|
2186 if (c == NULL) {
|
|
|
2187 if (ngx_close_socket(s) == -1) {
|
|
560
|
2188 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno,
|
|
350
|
2189 ngx_close_socket_n "failed");
|
|
|
2190 }
|
|
|
2191
|
|
|
2192 return NGX_ERROR;
|
|
|
2193 }
|
|
|
2194
|
|
|
2195 if (ngx_nonblocking(s) == -1) {
|
|
560
|
2196 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno,
|
|
350
|
2197 ngx_nonblocking_n " failed");
|
|
|
2198
|
|
|
2199 ngx_free_connection(c);
|
|
|
2200
|
|
|
2201 if (ngx_close_socket(s) == -1) {
|
|
560
|
2202 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno,
|
|
350
|
2203 ngx_close_socket_n " failed");
|
|
|
2204 }
|
|
|
2205
|
|
|
2206 return NGX_ERROR;
|
|
|
2207 }
|
|
|
2208
|
|
|
2209 rev = c->read;
|
|
|
2210 wev = c->write;
|
|
|
2211
|
|
560
|
2212 rev->log = &uc->log;
|
|
|
2213 wev->log = &uc->log;
|
|
350
|
2214
|
|
|
2215 uc->connection = c;
|
|
|
2216
|
|
|
2217 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1);
|
|
|
2218
|
|
|
2219 #if (NGX_THREADS)
|
|
|
2220
|
|
|
2221 /* TODO: lock event when call completion handler */
|
|
|
2222
|
|
|
2223 rev->lock = &c->lock;
|
|
|
2224 wev->lock = &c->lock;
|
|
|
2225 rev->own_lock = &c->lock;
|
|
|
2226 wev->own_lock = &c->lock;
|
|
|
2227
|
|
|
2228 #endif
|
|
|
2229
|
|
560
|
2230 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, &uc->log, 0,
|
|
350
|
2231 "connect to %V, fd:%d #%d", &uc->server, s, c->number);
|
|
|
2232
|
|
|
2233 rc = connect(s, uc->sockaddr, uc->socklen);
|
|
|
2234
|
|
|
2235 /* TODO: aio, iocp */
|
|
|
2236
|
|
|
2237 if (rc == -1) {
|
|
560
|
2238 ngx_log_error(NGX_LOG_CRIT, &uc->log, ngx_socket_errno,
|
|
|
2239 "connect() failed");
|
|
350
|
2240
|
|
|
2241 return NGX_ERROR;
|
|
|
2242 }
|
|
|
2243
|
|
|
2244 /* UDP sockets are always ready to write */
|
|
|
2245 wev->ready = 1;
|
|
|
2246
|
|
|
2247 if (ngx_add_event) {
|
|
|
2248
|
|
|
2249 event = (ngx_event_flags & NGX_USE_CLEAR_EVENT) ?
|
|
|
2250 /* kqueue, epoll */ NGX_CLEAR_EVENT:
|
|
|
2251 /* select, poll, /dev/poll */ NGX_LEVEL_EVENT;
|
|
|
2252 /* eventport event type has no meaning: oneshot only */
|
|
|
2253
|
|
|
2254 if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) {
|
|
|
2255 return NGX_ERROR;
|
|
|
2256 }
|
|
|
2257
|
|
|
2258 } else {
|
|
|
2259 /* rtsig */
|
|
|
2260
|
|
|
2261 if (ngx_add_conn(c) == NGX_ERROR) {
|
|
|
2262 return NGX_ERROR;
|
|
|
2263 }
|
|
|
2264 }
|
|
|
2265
|
|
|
2266 return NGX_OK;
|
|
|
2267 }
|
