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annotate src/core/ngx_resolver.h @ 7682:2ab0ecfe5a5f

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release-1.19.1 tag
author Maxim Dounin <mdounin@mdounin.ru>
date Tue, 07 Jul 2020 18:56:06 +0300
parents 70e65bf8dfd7
children 2a77754cd9fe
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 * Copyright (C) Nginx, Inc.
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5 */
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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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12 #ifndef _NGX_RESOLVER_H_INCLUDED_
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13 #define _NGX_RESOLVER_H_INCLUDED_
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16 #define NGX_RESOLVE_A 1
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17 #define NGX_RESOLVE_CNAME 5
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18 #define NGX_RESOLVE_PTR 12
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19 #define NGX_RESOLVE_MX 15
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20 #define NGX_RESOLVE_TXT 16
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21 #if (NGX_HAVE_INET6)
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22 #define NGX_RESOLVE_AAAA 28
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23 #endif
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24 #define NGX_RESOLVE_SRV 33
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25 #define NGX_RESOLVE_DNAME 39
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27 #define NGX_RESOLVE_FORMERR 1
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28 #define NGX_RESOLVE_SERVFAIL 2
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29 #define NGX_RESOLVE_NXDOMAIN 3
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30 #define NGX_RESOLVE_NOTIMP 4
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31 #define NGX_RESOLVE_REFUSED 5
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32 #define NGX_RESOLVE_TIMEDOUT NGX_ETIMEDOUT
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34
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35 #define NGX_NO_RESOLVER (void *) -1
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36
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37 #define NGX_RESOLVER_MAX_RECURSION 50
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39
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40 typedef struct ngx_resolver_s ngx_resolver_t;
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41
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42
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43 typedef struct {
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44 ngx_connection_t *udp;
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45 ngx_connection_t *tcp;
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46 struct sockaddr *sockaddr;
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47 socklen_t socklen;
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48 ngx_str_t server;
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49 ngx_log_t log;
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50 ngx_buf_t *read_buf;
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51 ngx_buf_t *write_buf;
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52 ngx_resolver_t *resolver;
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53 } ngx_resolver_connection_t;
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54
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55
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56 typedef struct ngx_resolver_ctx_s ngx_resolver_ctx_t;
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57
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58 typedef void (*ngx_resolver_handler_pt)(ngx_resolver_ctx_t *ctx);
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59
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61 typedef struct {
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62 struct sockaddr *sockaddr;
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63 socklen_t socklen;
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64 ngx_str_t name;
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65 u_short priority;
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66 u_short weight;
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67 } ngx_resolver_addr_t;
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68
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70 typedef struct {
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71 ngx_str_t name;
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72 u_short priority;
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73 u_short weight;
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74 u_short port;
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75 } ngx_resolver_srv_t;
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78 typedef struct {
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79 ngx_str_t name;
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80 u_short priority;
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81 u_short weight;
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82 u_short port;
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83
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84 ngx_resolver_ctx_t *ctx;
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85 ngx_int_t state;
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86
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87 ngx_uint_t naddrs;
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88 ngx_addr_t *addrs;
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89 } ngx_resolver_srv_name_t;
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91
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92 typedef struct {
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93 ngx_rbtree_node_t node;
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94 ngx_queue_t queue;
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95
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96 /* PTR: resolved name, A: name to resolve */
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97 u_char *name;
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98
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99 #if (NGX_HAVE_INET6)
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100 /* PTR: IPv6 address to resolve (IPv4 address is in rbtree node key) */
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101 struct in6_addr addr6;
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102 #endif
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103
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104 u_short nlen;
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105 u_short qlen;
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106
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107 u_char *query;
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108 #if (NGX_HAVE_INET6)
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109 u_char *query6;
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110 #endif
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111
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112 union {
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113 in_addr_t addr;
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114 in_addr_t *addrs;
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115 u_char *cname;
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116 ngx_resolver_srv_t *srvs;
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117 } u;
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118
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119 u_char code;
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120 u_short naddrs;
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121 u_short nsrvs;
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122 u_short cnlen;
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123
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124 #if (NGX_HAVE_INET6)
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125 union {
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126 struct in6_addr addr6;
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127 struct in6_addr *addrs6;
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128 } u6;
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129
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130 u_short naddrs6;
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131 #endif
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132
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133 time_t expire;
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134 time_t valid;
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135 uint32_t ttl;
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136
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137 unsigned tcp:1;
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138 #if (NGX_HAVE_INET6)
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139 unsigned tcp6:1;
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140 #endif
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141
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142 ngx_uint_t last_connection;
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143
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144 ngx_resolver_ctx_t *waiting;
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145 } ngx_resolver_node_t;
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146
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147
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148 struct ngx_resolver_s {
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149 /* has to be pointer because of "incomplete type" */
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150 ngx_event_t *event;
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151 void *dummy;
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152 ngx_log_t *log;
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153
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154 /* event ident must be after 3 pointers as in ngx_connection_t */
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155 ngx_int_t ident;
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156
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157 /* simple round robin DNS peers balancer */
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158 ngx_array_t connections;
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159 ngx_uint_t last_connection;
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160
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161 ngx_rbtree_t name_rbtree;
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162 ngx_rbtree_node_t name_sentinel;
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163
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164 ngx_rbtree_t srv_rbtree;
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165 ngx_rbtree_node_t srv_sentinel;
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166
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167 ngx_rbtree_t addr_rbtree;
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168 ngx_rbtree_node_t addr_sentinel;
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169
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170 ngx_queue_t name_resend_queue;
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171 ngx_queue_t srv_resend_queue;
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172 ngx_queue_t addr_resend_queue;
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173
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174 ngx_queue_t name_expire_queue;
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175 ngx_queue_t srv_expire_queue;
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176 ngx_queue_t addr_expire_queue;
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177
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178 #if (NGX_HAVE_INET6)
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179 ngx_uint_t ipv6; /* unsigned ipv6:1; */
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180 ngx_rbtree_t addr6_rbtree;
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181 ngx_rbtree_node_t addr6_sentinel;
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182 ngx_queue_t addr6_resend_queue;
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183 ngx_queue_t addr6_expire_queue;
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184 #endif
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185
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186 time_t resend_timeout;
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187 time_t tcp_timeout;
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188 time_t expire;
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189 time_t valid;
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190
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191 ngx_uint_t log_level;
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192 };
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193
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194
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195 struct ngx_resolver_ctx_s {
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196 ngx_resolver_ctx_t *next;
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197 ngx_resolver_t *resolver;
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198 ngx_resolver_node_t *node;
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199
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200 /* event ident must be after 3 pointers as in ngx_connection_t */
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201 ngx_int_t ident;
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202
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203 ngx_int_t state;
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204 ngx_str_t name;
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205 ngx_str_t service;
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206
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207 time_t valid;
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208 ngx_uint_t naddrs;
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209 ngx_resolver_addr_t *addrs;
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210 ngx_resolver_addr_t addr;
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211 struct sockaddr_in sin;
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212
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213 ngx_uint_t count;
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214 ngx_uint_t nsrvs;
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215 ngx_resolver_srv_name_t *srvs;
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216
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217 ngx_resolver_handler_pt handler;
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218 void *data;
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219 ngx_msec_t timeout;
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220
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221 unsigned quick:1;
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222 unsigned async:1;
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223 unsigned cancelable:1;
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224 ngx_uint_t recursion;
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225 ngx_event_t *event;
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226 };
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227
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228
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229 ngx_resolver_t *ngx_resolver_create(ngx_conf_t *cf, ngx_str_t *names,
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230 ngx_uint_t n);
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231 ngx_resolver_ctx_t *ngx_resolve_start(ngx_resolver_t *r,
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232 ngx_resolver_ctx_t *temp);
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233 ngx_int_t ngx_resolve_name(ngx_resolver_ctx_t *ctx);
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234 void ngx_resolve_name_done(ngx_resolver_ctx_t *ctx);
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235 ngx_int_t ngx_resolve_addr(ngx_resolver_ctx_t *ctx);
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236 void ngx_resolve_addr_done(ngx_resolver_ctx_t *ctx);
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237 char *ngx_resolver_strerror(ngx_int_t err);
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238
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239
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240 #endif /* _NGX_RESOLVER_H_INCLUDED_ */