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