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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
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10
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11 #ifndef _NGX_RESOLVER_H_INCLUDED_
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12 #define _NGX_RESOLVER_H_INCLUDED_
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13
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14
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15 #define NGX_RESOLVE_A 1
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16 #define NGX_RESOLVE_CNAME 5
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17 #define NGX_RESOLVE_PTR 12
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18 #define NGX_RESOLVE_MX 15
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19 #define NGX_RESOLVE_TXT 16
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20
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21 #define NGX_RESOLVE_FORMERR 1
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22 #define NGX_RESOLVE_SERVFAIL 2
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23 #define NGX_RESOLVE_NXDOMAIN 3
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24 #define NGX_RESOLVE_NOTIMP 4
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25 #define NGX_RESOLVE_REFUSED 5
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26 #define NGX_RESOLVE_TIMEDOUT NGX_ETIMEDOUT
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27
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28
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354
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29 #define NGX_NO_RESOLVER (void *) -1
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30
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31
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350
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32 typedef struct {
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33 ngx_connection_t *connection;
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34 struct sockaddr *sockaddr;
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35 socklen_t socklen;
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36 ngx_str_t server;
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37 ngx_log_t *log;
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38 } ngx_udp_connection_t;
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39
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40
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41 typedef struct ngx_resolver_ctx_s ngx_resolver_ctx_t;
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42
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43 typedef void (*ngx_resolver_handler_pt)(ngx_resolver_ctx_t *ctx);
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44
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45
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46 typedef struct {
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47 ngx_rbtree_node_t node;
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48 ngx_queue_t queue;
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49
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50 /* PTR: resolved name, A: name to resolve */
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51 u_char *name;
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52
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53 u_short nlen;
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54 u_short qlen;
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55
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56 u_char *query;
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57
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58 union {
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59 in_addr_t addr;
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60 in_addr_t *addrs;
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61 u_char *cname;
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62 } u;
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63
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64 u_short naddrs;
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65 u_short cnlen;
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66
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67 time_t expire;
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68 time_t valid;
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69
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70 ngx_resolver_ctx_t *waiting;
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71 } ngx_resolver_node_t;
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72
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73
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74 typedef struct {
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75 /* has to be pointer because of "incomplete type" */
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76 ngx_event_t *event;
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77
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78 /* TODO: DNS peers balancer */
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79 /* STUB */
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80 ngx_udp_connection_t *udp_connection;
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81
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82 ngx_log_t *log;
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83
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84 /* ident must be after 3 pointers */
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85 ngx_int_t ident;
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86
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87 ngx_rbtree_t name_rbtree;
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88 ngx_rbtree_node_t name_sentinel;
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89
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90 ngx_rbtree_t addr_rbtree;
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91 ngx_rbtree_node_t addr_sentinel;
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92
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93 ngx_queue_t name_resend_queue;
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94 ngx_queue_t addr_resend_queue;
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95
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96 ngx_queue_t name_expire_queue;
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97 ngx_queue_t addr_expire_queue;
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98
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99 time_t resend_timeout;
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100 time_t expire;
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101 time_t valid;
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102
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103 ngx_uint_t log_level;
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104 } ngx_resolver_t;
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105
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106
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107 struct ngx_resolver_ctx_s {
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108 ngx_resolver_ctx_t *next;
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109 ngx_resolver_t *resolver;
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110 ngx_udp_connection_t *udp_connection;
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111
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112 /* ident must be after 3 pointers */
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113 ngx_int_t ident;
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114
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115 ngx_int_t state;
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116 ngx_int_t type;
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117 ngx_str_t name;
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118
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119 ngx_uint_t naddrs;
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120 in_addr_t *addrs;
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121 in_addr_t addr;
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122
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123 /* TODO: DNS peers balancer ctx */
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124
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125 ngx_resolver_handler_pt handler;
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126 void *data;
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127 ngx_msec_t timeout;
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128
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129 ngx_uint_t quick; /* unsigned quick:1; */
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130 ngx_event_t *event;
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131 };
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132
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133
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366
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134 ngx_resolver_t *ngx_resolver_create(ngx_conf_t *cf, ngx_peer_addr_t *addr);
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350
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135 ngx_resolver_ctx_t *ngx_resolve_start(ngx_resolver_t *r,
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136 ngx_resolver_ctx_t *temp);
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137 ngx_int_t ngx_resolve_name(ngx_resolver_ctx_t *ctx);
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138 void ngx_resolve_name_done(ngx_resolver_ctx_t *ctx);
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139 ngx_int_t ngx_resolve_addr(ngx_resolver_ctx_t *ctx);
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140 void ngx_resolve_addr_done(ngx_resolver_ctx_t *ctx);
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141 char *ngx_resolver_strerror(ngx_int_t err);
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142
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143
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144 #endif /* _NGX_RESOLVER_H_INCLUDED_ */
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