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annotate src/core/ngx_resolver.h @ 7690:8253424d1aff

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Added size check to ngx_http_alloc_large_header_buffer(). This ensures that copying won't write more than the buffer size even if the buffer comes from hc->free and it is smaller than the large client header buffer size in the virtual host configuration. This might happen if size of large client header buffers is different in name-based virtual hosts, similarly to the problem with number of buffers fixed in 6926:e662cbf1b932.
author Maxim Dounin <mdounin@mdounin.ru>
date Thu, 06 Aug 2020 05:02:22 +0300
parents 70e65bf8dfd7
children 2a77754cd9fe
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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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33
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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 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_ */