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