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annotate src/core/ngx_resolver.h @ 6640:e78eca6bfaf0

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HTTP/2: fixed send timer handling. Checking for return value of c->send_chain() isn't sufficient since there are data can be left in the SSL buffer. Now the wew->ready flag is used instead. In particular, this fixed a connection leak in cases when all streams were closed, but there's still some data to be sent in the SSL buffer and the client forgot about the connection.
author Valentin Bartenev <vbart@nginx.com>
date Tue, 19 Jul 2016 20:31:09 +0300
parents 384154fc634f
children c3e3de6d2672
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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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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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12 #ifndef _NGX_RESOLVER_H_INCLUDED_
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13 #define _NGX_RESOLVER_H_INCLUDED_
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15
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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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38
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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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60
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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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69
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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
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86 ngx_uint_t naddrs;
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87 ngx_addr_t *addrs;
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88 } ngx_resolver_srv_name_t;
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89
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90
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91 typedef struct {
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92 ngx_rbtree_node_t node;
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93 ngx_queue_t queue;
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94
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95 /* PTR: resolved name, A: name to resolve */
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96 u_char *name;
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97
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98 #if (NGX_HAVE_INET6)
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99 /* PTR: IPv6 address to resolve (IPv4 address is in rbtree node key) */
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100 struct in6_addr addr6;
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101 #endif
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102
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103 u_short nlen;
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104 u_short qlen;
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105
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106 u_char *query;
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107 #if (NGX_HAVE_INET6)
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108 u_char *query6;
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109 #endif
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110
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111 union {
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112 in_addr_t addr;
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113 in_addr_t *addrs;
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114 u_char *cname;
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115 ngx_resolver_srv_t *srvs;
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116 } u;
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117
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118 u_char code;
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119 u_short naddrs;
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120 u_short nsrvs;
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121 u_short cnlen;
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122
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123 #if (NGX_HAVE_INET6)
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124 union {
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125 struct in6_addr addr6;
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126 struct in6_addr *addrs6;
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127 } u6;
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128
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129 u_short naddrs6;
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130 #endif
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131
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132 time_t expire;
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133 time_t valid;
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134 uint32_t ttl;
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135
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136 unsigned tcp:1;
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137 #if (NGX_HAVE_INET6)
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138 unsigned tcp6:1;
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139 #endif
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140
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141 ngx_uint_t last_connection;
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142
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143 ngx_resolver_ctx_t *waiting;
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144 } ngx_resolver_node_t;
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145
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146
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147 struct ngx_resolver_s {
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148 /* has to be pointer because of "incomplete type" */
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149 ngx_event_t *event;
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150 void *dummy;
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151 ngx_log_t *log;
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152
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153 /* event ident must be after 3 pointers as in ngx_connection_t */
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154 ngx_int_t ident;
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155
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156 /* simple round robin DNS peers balancer */
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157 ngx_array_t connections;
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158 ngx_uint_t last_connection;
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159
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160 ngx_rbtree_t name_rbtree;
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161 ngx_rbtree_node_t name_sentinel;
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162
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163 ngx_rbtree_t srv_rbtree;
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164 ngx_rbtree_node_t srv_sentinel;
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165
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166 ngx_rbtree_t addr_rbtree;
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167 ngx_rbtree_node_t addr_sentinel;
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168
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169 ngx_queue_t name_resend_queue;
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170 ngx_queue_t srv_resend_queue;
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171 ngx_queue_t addr_resend_queue;
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172
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173 ngx_queue_t name_expire_queue;
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174 ngx_queue_t srv_expire_queue;
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175 ngx_queue_t addr_expire_queue;
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176
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177 #if (NGX_HAVE_INET6)
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178 ngx_uint_t ipv6; /* unsigned ipv6:1; */
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179 ngx_rbtree_t addr6_rbtree;
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180 ngx_rbtree_node_t addr6_sentinel;
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181 ngx_queue_t addr6_resend_queue;
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182 ngx_queue_t addr6_expire_queue;
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183 #endif
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184
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185 time_t resend_timeout;
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186 time_t tcp_timeout;
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187 time_t expire;
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188 time_t valid;
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189
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190 ngx_uint_t log_level;
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191 };
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192
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193
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194 struct ngx_resolver_ctx_s {
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195 ngx_resolver_ctx_t *next;
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196 ngx_resolver_t *resolver;
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197 ngx_resolver_node_t *node;
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198
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199 /* event ident must be after 3 pointers as in ngx_connection_t */
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200 ngx_int_t ident;
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201
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202 ngx_int_t state;
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203 ngx_str_t name;
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204 ngx_str_t service;
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205
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206 time_t valid;
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207 ngx_uint_t naddrs;
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208 ngx_resolver_addr_t *addrs;
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209 ngx_resolver_addr_t addr;
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210 struct sockaddr_in sin;
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211
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212 ngx_uint_t count;
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213 ngx_uint_t nsrvs;
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214 ngx_resolver_srv_name_t *srvs;
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215
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216 ngx_resolver_handler_pt handler;
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217 void *data;
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218 ngx_msec_t timeout;
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219
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220 ngx_uint_t quick; /* unsigned quick:1; */
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221 ngx_uint_t recursion;
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222 ngx_event_t *event;
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223 };
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224
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225
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226 ngx_resolver_t *ngx_resolver_create(ngx_conf_t *cf, ngx_str_t *names,
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227 ngx_uint_t n);
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228 ngx_resolver_ctx_t *ngx_resolve_start(ngx_resolver_t *r,
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229 ngx_resolver_ctx_t *temp);
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230 ngx_int_t ngx_resolve_name(ngx_resolver_ctx_t *ctx);
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231 void ngx_resolve_name_done(ngx_resolver_ctx_t *ctx);
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232 ngx_int_t ngx_resolve_addr(ngx_resolver_ctx_t *ctx);
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233 void ngx_resolve_addr_done(ngx_resolver_ctx_t *ctx);
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234 char *ngx_resolver_strerror(ngx_int_t err);
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235
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236
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237 #endif /* _NGX_RESOLVER_H_INCLUDED_ */