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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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356
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70 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans);
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350
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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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356
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72 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan);
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350
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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;
|
|
|
414 }
|
|
|
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
|
|
358
|
672 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0,
|
|
|
673 "resolver expire \"%*s\"", (size_t) rn->nlen, rn->name);
|
|
350
|
674
|
|
|
675 ngx_queue_remove(q);
|
|
|
676
|
|
|
677 ngx_rbtree_delete(tree, &rn->node);
|
|
|
678
|
|
|
679 ngx_resolver_free_node(r, rn);
|
|
|
680 }
|
|
|
681 }
|
|
|
682
|
|
|
683
|
|
|
684 static ngx_int_t
|
|
|
685 ngx_resolver_send_query(ngx_resolver_t *r, ngx_resolver_node_t *rn)
|
|
|
686 {
|
|
|
687 ssize_t n;
|
|
|
688 ngx_udp_connection_t *uc;
|
|
|
689
|
|
|
690 uc = r->udp_connection;
|
|
|
691
|
|
|
692 if (uc->connection == NULL) {
|
|
|
693 if (ngx_udp_connect(uc) != NGX_OK) {
|
|
|
694 return NGX_ERROR;
|
|
|
695 }
|
|
|
696
|
|
|
697 uc->connection->data = r;
|
|
|
698 uc->connection->read->handler = ngx_resolver_read_response;
|
|
|
699 }
|
|
|
700
|
|
|
701 n = ngx_send(uc->connection, rn->query, rn->qlen);
|
|
|
702
|
|
|
703 if (n == -1) {
|
|
|
704 return NGX_ERROR;
|
|
|
705 }
|
|
|
706
|
|
|
707 if ((size_t) n != (size_t) rn->qlen) {
|
|
|
708 ngx_log_error(NGX_LOG_CRIT, uc->log, 0, "send() incomplete");
|
|
|
709 return NGX_ERROR;
|
|
|
710 }
|
|
|
711
|
|
|
712 return NGX_OK;
|
|
|
713 }
|
|
|
714
|
|
|
715
|
|
|
716 static void
|
|
|
717 ngx_resolver_resend_handler(ngx_event_t *ev)
|
|
|
718 {
|
|
|
719 time_t timer, atimer, ntimer;
|
|
|
720 ngx_resolver_t *r;
|
|
|
721
|
|
|
722 r = ev->data;
|
|
|
723
|
|
|
724 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0,
|
|
|
725 "resolver resend handler");
|
|
|
726
|
|
|
727 /* lock name mutex */
|
|
|
728
|
|
|
729 ntimer = ngx_resolver_resend(r, &r->name_rbtree, &r->name_resend_queue);
|
|
|
730
|
|
|
731 /* unlock name mutex */
|
|
|
732
|
|
|
733 /* lock addr mutex */
|
|
|
734
|
|
|
735 atimer = ngx_resolver_resend(r, &r->addr_rbtree, &r->addr_resend_queue);
|
|
354
|
736
|
|
350
|
737 /* unlock addr mutex */
|
|
|
738
|
|
|
739 if (ntimer == 0) {
|
|
|
740 timer = atimer;
|
|
|
741
|
|
|
742 } else if (atimer == 0) {
|
|
|
743 timer = ntimer;
|
|
|
744
|
|
|
745 } else {
|
|
|
746 timer = (atimer < ntimer) ? atimer : ntimer;
|
|
|
747 }
|
|
|
748
|
|
|
749 if (timer) {
|
|
|
750 ngx_add_timer(r->event, (ngx_msec_t) (timer * 1000));
|
|
|
751 }
|
|
|
752 }
|
|
|
753
|
|
|
754
|
|
|
755 static time_t
|
|
|
756 ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue)
|
|
|
757 {
|
|
|
758 time_t now;
|
|
|
759 ngx_queue_t *q;
|
|
|
760 ngx_resolver_node_t *rn;
|
|
|
761
|
|
|
762 now = ngx_time();
|
|
|
763
|
|
|
764 for ( ;; ) {
|
|
|
765 if (ngx_queue_empty(queue)) {
|
|
|
766 return 0;
|
|
|
767 }
|
|
|
768
|
|
|
769 q = ngx_queue_last(queue);
|
|
|
770
|
|
|
771 rn = ngx_queue_data(q, ngx_resolver_node_t, queue);
|
|
|
772
|
|
|
773 if (now < rn->expire) {
|
|
|
774 return rn->expire - now;
|
|
|
775 }
|
|
|
776
|
|
358
|
777 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0,
|
|
|
778 "resolver resend \"%*s\" %p",
|
|
|
779 (size_t) rn->nlen, rn->name, rn->waiting);
|
|
350
|
780
|
|
|
781 ngx_queue_remove(q);
|
|
|
782
|
|
|
783 if (rn->waiting) {
|
|
|
784
|
|
|
785 if (ngx_resolver_send_query(r, rn) == NGX_OK) {
|
|
|
786
|
|
|
787 rn->expire = now + r->resend_timeout;
|
|
|
788
|
|
|
789 ngx_queue_insert_head(queue, &rn->queue);
|
|
|
790
|
|
|
791 continue;
|
|
|
792 }
|
|
|
793 }
|
|
|
794
|
|
|
795 ngx_rbtree_delete(tree, &rn->node);
|
|
|
796
|
|
|
797 ngx_resolver_free_node(r, rn);
|
|
|
798 }
|
|
|
799 }
|
|
|
800
|
|
|
801
|
|
|
802 static void
|
|
|
803 ngx_resolver_read_response(ngx_event_t *rev)
|
|
|
804 {
|
|
|
805 ssize_t n;
|
|
|
806 ngx_connection_t *c;
|
|
|
807 u_char buf[NGX_RESOLVER_UDP_SIZE];
|
|
|
808
|
|
|
809 c = rev->data;
|
|
|
810
|
|
|
811 do {
|
|
354
|
812 n = ngx_udp_recv(c, buf, NGX_RESOLVER_UDP_SIZE);
|
|
|
813
|
|
|
814 if (n < 0) {
|
|
350
|
815 return;
|
|
|
816 }
|
|
|
817
|
|
|
818 ngx_resolver_process_response(c->data, buf, n);
|
|
|
819
|
|
|
820 } while (rev->ready);
|
|
|
821 }
|
|
|
822
|
|
|
823
|
|
|
824 static void
|
|
|
825 ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, size_t n)
|
|
|
826 {
|
|
|
827 char *err;
|
|
|
828 size_t len;
|
|
|
829 ngx_uint_t i, ident, flags, code, nqs, nan, qtype, qclass;
|
|
|
830 ngx_resolver_qs_t *qs;
|
|
|
831 ngx_resolver_query_t *query;
|
|
|
832
|
|
|
833 if ((size_t) n < sizeof(ngx_resolver_query_t) + 1) {
|
|
|
834 goto short_response;
|
|
|
835 }
|
|
|
836
|
|
|
837 query = (ngx_resolver_query_t *) buf;
|
|
|
838
|
|
|
839 ident = (query->ident_hi << 8) + query->ident_lo;
|
|
|
840 flags = (query->flags_hi << 8) + query->flags_lo;
|
|
|
841 nqs = (query->nqs_hi << 8) + query->nqs_lo;
|
|
|
842 nan = (query->nan_hi << 8) + query->nan_lo;
|
|
|
843
|
|
|
844 ngx_log_debug6(NGX_LOG_DEBUG_CORE, r->log, 0,
|
|
|
845 "resolver DNS response %d fl:%04Xud %d/%d/%d/%d",
|
|
|
846 ident, flags, nqs, nan,
|
|
|
847 (query->nns_hi << 8) + query->nns_lo,
|
|
|
848 (query->nar_hi << 8) + query->nar_lo);
|
|
|
849
|
|
|
850 if (!(flags & 0x8000)) {
|
|
|
851 ngx_log_error(r->log_level, r->log, 0,
|
|
|
852 "invalid DNS response %d fl:%04Xud", ident, flags);
|
|
|
853 return;
|
|
|
854 }
|
|
|
855
|
|
|
856 code = flags & 0x7f;
|
|
|
857
|
|
|
858 if (code == NGX_RESOLVE_FORMERR || code > NGX_RESOLVE_REFUSED) {
|
|
|
859 ngx_log_error(r->log_level, r->log, 0,
|
|
|
860 "DNS error (%d: %s), query id:%d",
|
|
|
861 code, ngx_resolver_strerror(code), ident);
|
|
|
862 return;
|
|
|
863 }
|
|
|
864
|
|
|
865 if (nqs != 1) {
|
|
|
866 err = "invalid number of questions in DNS response";
|
|
|
867 goto done;
|
|
|
868 }
|
|
|
869
|
|
|
870 i = sizeof(ngx_resolver_query_t);
|
|
|
871
|
|
|
872 while (i < (ngx_uint_t) n) {
|
|
|
873 if (buf[i] == '\0') {
|
|
|
874 goto found;
|
|
|
875 }
|
|
|
876
|
|
|
877 len = buf[i];
|
|
|
878 i += 1 + len;
|
|
|
879 }
|
|
|
880
|
|
|
881 goto short_response;
|
|
|
882
|
|
|
883 found:
|
|
|
884
|
|
|
885 if (i++ == 0) {
|
|
|
886 err = "zero-length domain name in DNS response";
|
|
|
887 goto done;
|
|
|
888 }
|
|
|
889
|
|
|
890 if (i + sizeof(ngx_resolver_qs_t) + nan * (2 + sizeof(ngx_resolver_an_t))
|
|
|
891 > (ngx_uint_t) n)
|
|
|
892 {
|
|
|
893 goto short_response;
|
|
|
894 }
|
|
|
895
|
|
|
896 qs = (ngx_resolver_qs_t *) &buf[i];
|
|
|
897
|
|
|
898 qtype = (qs->type_hi << 8) + qs->type_lo;
|
|
|
899 qclass = (qs->class_hi << 8) + qs->class_lo;
|
|
|
900
|
|
|
901 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0,
|
|
|
902 "resolver DNS response qt:%d cl:%d", qtype, qclass);
|
|
|
903
|
|
|
904 if (qclass != 1) {
|
|
|
905 ngx_log_error(r->log_level, r->log, 0,
|
|
|
906 "unknown query class %d in DNS response", qclass);
|
|
|
907 return;
|
|
|
908 }
|
|
|
909
|
|
|
910 switch (qtype) {
|
|
|
911
|
|
|
912 case NGX_RESOLVE_A:
|
|
|
913
|
|
|
914 ngx_resolver_process_a(r, buf, n, ident, code, nan,
|
|
356
|
915 i + sizeof(ngx_resolver_qs_t));
|
|
350
|
916
|
|
|
917 break;
|
|
|
918
|
|
|
919 case NGX_RESOLVE_PTR:
|
|
|
920
|
|
356
|
921 ngx_resolver_process_ptr(r, buf, n, ident, code, nan);
|
|
350
|
922
|
|
|
923 break;
|
|
|
924
|
|
|
925 default:
|
|
|
926 ngx_log_error(r->log_level, r->log, 0,
|
|
|
927 "unknown query type %d in DNS response", qtype);
|
|
|
928 return;
|
|
|
929 }
|
|
|
930
|
|
|
931 return;
|
|
|
932
|
|
|
933 short_response:
|
|
|
934
|
|
|
935 err = "short dns response";
|
|
|
936
|
|
|
937 done:
|
|
|
938
|
|
|
939 ngx_log_error(r->log_level, r->log, 0, err);
|
|
|
940
|
|
|
941 return;
|
|
|
942 }
|
|
|
943
|
|
|
944
|
|
|
945 static void
|
|
|
946 ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t last,
|
|
|
947 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans)
|
|
|
948 {
|
|
|
949 char *err;
|
|
|
950 u_char *cname;
|
|
|
951 size_t len;
|
|
|
952 uint32_t hash;
|
|
|
953 in_addr_t addr, *addrs;
|
|
|
954 ngx_str_t name;
|
|
|
955 ngx_uint_t qtype, qident, naddrs, a, i, n, start;
|
|
|
956 ngx_resolver_an_t *an;
|
|
|
957 ngx_resolver_ctx_t *ctx, *next;
|
|
|
958 ngx_resolver_node_t *rn;
|
|
|
959
|
|
|
960 if (ngx_resolver_copy(r, &name, buf, &buf[12], &buf[last]) != NGX_OK) {
|
|
|
961 return;
|
|
|
962 }
|
|
|
963
|
|
|
964 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver qs:%V", &name);
|
|
|
965
|
|
|
966 hash = ngx_crc32_short(name.data, name.len);
|
|
|
967
|
|
|
968 /* lock name mutex */
|
|
|
969
|
|
|
970 rn = ngx_resolver_lookup_name(r, &name, hash);
|
|
|
971
|
|
|
972 if (rn == NULL || rn->query == NULL) {
|
|
|
973 ngx_log_error(r->log_level, r->log, 0,
|
|
|
974 "unexpected response for %V", &name);
|
|
|
975 goto failed;
|
|
|
976 }
|
|
|
977
|
|
|
978 qident = (rn->query[0] << 8) + rn->query[1];
|
|
|
979
|
|
|
980 if (ident != qident) {
|
|
|
981 ngx_log_error(r->log_level, r->log, 0,
|
|
|
982 "wrong ident %d response for %V, expect %d",
|
|
|
983 ident, &name, qident);
|
|
|
984 goto failed;
|
|
|
985 }
|
|
|
986
|
|
356
|
987 if (code == 0 && nan == 0) {
|
|
|
988 code = 3; /* NXDOMAIN */
|
|
|
989 }
|
|
|
990
|
|
350
|
991 if (code) {
|
|
|
992 next = rn->waiting;
|
|
|
993 rn->waiting = NULL;
|
|
|
994
|
|
|
995 ngx_queue_remove(&rn->queue);
|
|
|
996
|
|
|
997 ngx_rbtree_delete(&r->name_rbtree, &rn->node);
|
|
|
998
|
|
|
999 ngx_resolver_free_node(r, rn);
|
|
|
1000
|
|
|
1001 /* unlock name mutex */
|
|
|
1002
|
|
|
1003 while (next) {
|
|
|
1004 ctx = next;
|
|
|
1005 ctx->state = code;
|
|
|
1006 next = ctx->next;
|
|
|
1007
|
|
|
1008 ctx->handler(ctx);
|
|
|
1009 }
|
|
|
1010
|
|
|
1011 return;
|
|
|
1012 }
|
|
|
1013
|
|
|
1014 i = ans;
|
|
|
1015 naddrs = 0;
|
|
|
1016 addr = 0;
|
|
|
1017 addrs = NULL;
|
|
|
1018 cname = NULL;
|
|
|
1019 qtype = 0;
|
|
|
1020
|
|
|
1021 for (a = 0; a < nan; a++) {
|
|
|
1022
|
|
|
1023 start = i;
|
|
|
1024
|
|
|
1025 while (i < last) {
|
|
|
1026
|
|
|
1027 if (buf[i] & 0xc0) {
|
|
|
1028 i += 2;
|
|
|
1029 goto found;
|
|
|
1030 }
|
|
|
1031
|
|
|
1032 if (buf[i] == 0) {
|
|
|
1033 i++;
|
|
|
1034 goto test_length;
|
|
|
1035 }
|
|
|
1036
|
|
|
1037 i += 1 + buf[i];
|
|
|
1038 }
|
|
|
1039
|
|
|
1040 goto short_response;
|
|
|
1041
|
|
|
1042 test_length:
|
|
|
1043
|
|
|
1044 if (i - start < 2) {
|
|
|
1045 err = "invalid name in dns response";
|
|
|
1046 goto invalid;
|
|
|
1047 }
|
|
|
1048
|
|
|
1049 found:
|
|
|
1050
|
|
|
1051 if (i + sizeof(ngx_resolver_an_t) >= last) {
|
|
|
1052 goto short_response;
|
|
|
1053 }
|
|
|
1054
|
|
|
1055 an = (ngx_resolver_an_t *) &buf[i];
|
|
|
1056
|
|
|
1057 qtype = (an->type_hi << 8) + an->type_lo;
|
|
|
1058 len = (an->len_hi << 8) + an->len_lo;
|
|
|
1059
|
|
|
1060 if (qtype == NGX_RESOLVE_A) {
|
|
|
1061
|
|
|
1062 i += sizeof(ngx_resolver_an_t);
|
|
|
1063
|
|
|
1064 if (i + len > last) {
|
|
|
1065 goto short_response;
|
|
|
1066 }
|
|
|
1067
|
|
|
1068 addr = htonl((buf[i] << 24) + (buf[i + 1] << 16)
|
|
|
1069 + (buf[i + 2] << 8) + (buf[i + 3]));
|
|
|
1070
|
|
|
1071 naddrs++;
|
|
|
1072
|
|
|
1073 i += len;
|
|
|
1074
|
|
|
1075 } else if (qtype == NGX_RESOLVE_CNAME) {
|
|
|
1076 cname = &buf[i] + sizeof(ngx_resolver_an_t);
|
|
|
1077 i += sizeof(ngx_resolver_an_t) + len;
|
|
|
1078 }
|
|
|
1079 }
|
|
|
1080
|
|
|
1081 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0,
|
|
|
1082 "resolver naddrs:%ui cname:%p", naddrs, cname);
|
|
|
1083
|
|
|
1084 if (naddrs) {
|
|
|
1085
|
|
|
1086 if (naddrs == 1) {
|
|
|
1087 rn->u.addr = addr;
|
|
|
1088
|
|
|
1089 } else {
|
|
|
1090
|
|
|
1091 addrs = ngx_resolver_alloc(r, naddrs * sizeof(in_addr_t));
|
|
|
1092 if (addrs == NULL) {
|
|
|
1093 return;
|
|
|
1094 }
|
|
|
1095
|
|
|
1096 n = 0;
|
|
|
1097 i = ans;
|
|
|
1098
|
|
|
1099 for (a = 0; a < nan; a++) {
|
|
|
1100
|
|
|
1101 for ( ;; ) {
|
|
|
1102
|
|
|
1103 if (buf[i] & 0xc0) {
|
|
|
1104 i += 2;
|
|
|
1105 goto ok;
|
|
|
1106 }
|
|
|
1107
|
|
|
1108 if (buf[i] == 0) {
|
|
|
1109 i++;
|
|
|
1110 goto ok;
|
|
|
1111 }
|
|
|
1112
|
|
|
1113 i += 1 + buf[i];
|
|
|
1114 }
|
|
|
1115
|
|
|
1116 ok:
|
|
|
1117
|
|
|
1118 an = (ngx_resolver_an_t *) &buf[i];
|
|
|
1119
|
|
|
1120 qtype = (an->type_hi << 8) + an->type_lo;
|
|
|
1121 len = (an->len_hi << 8) + an->len_lo;
|
|
|
1122
|
|
|
1123 i += sizeof(ngx_resolver_an_t);
|
|
|
1124
|
|
|
1125 if (qtype == NGX_RESOLVE_A) {
|
|
|
1126
|
|
|
1127 addrs[n++] = htonl((buf[i] << 24) + (buf[i + 1] << 16)
|
|
|
1128 + (buf[i + 2] << 8) + (buf[i + 3]));
|
|
|
1129
|
|
|
1130 if (n == naddrs) {
|
|
|
1131 break;
|
|
|
1132 }
|
|
|
1133 }
|
|
|
1134
|
|
|
1135 i += len;
|
|
|
1136 }
|
|
|
1137
|
|
|
1138 rn->u.addrs = addrs;
|
|
|
1139
|
|
|
1140 addrs = ngx_resolver_dup(r, rn->u.addrs,
|
|
|
1141 naddrs * sizeof(in_addr_t));
|
|
|
1142 if (addrs == NULL) {
|
|
|
1143 return;
|
|
|
1144 }
|
|
|
1145 }
|
|
|
1146
|
|
|
1147 rn->naddrs = (u_short) naddrs;
|
|
|
1148
|
|
|
1149 ngx_queue_remove(&rn->queue);
|
|
|
1150
|
|
|
1151 rn->valid = ngx_time() + r->valid;
|
|
|
1152 rn->expire = ngx_time() + r->expire;
|
|
|
1153
|
|
|
1154 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue);
|
|
|
1155
|
|
|
1156 next = rn->waiting;
|
|
|
1157 rn->waiting = NULL;
|
|
|
1158
|
|
|
1159 /* unlock name mutex */
|
|
|
1160
|
|
|
1161 while (next) {
|
|
|
1162 ctx = next;
|
|
|
1163 ctx->state = NGX_OK;
|
|
|
1164 ctx->naddrs = naddrs;
|
|
|
1165 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs;
|
|
|
1166 ctx->addr = addr;
|
|
|
1167 next = ctx->next;
|
|
|
1168
|
|
|
1169 ctx->handler(ctx);
|
|
|
1170 }
|
|
|
1171
|
|
|
1172 if (naddrs) {
|
|
|
1173 ngx_resolver_free(r, addrs);
|
|
|
1174 }
|
|
|
1175
|
|
|
1176 return;
|
|
|
1177
|
|
|
1178 } else if (cname) {
|
|
|
1179
|
|
|
1180 /* CNAME only */
|
|
|
1181
|
|
|
1182 if (ngx_resolver_copy(r, &name, buf, cname, &buf[last]) != NGX_OK) {
|
|
|
1183 return;
|
|
|
1184 }
|
|
|
1185
|
|
|
1186 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0,
|
|
|
1187 "resolver cname:\"%V\"", &name);
|
|
|
1188
|
|
356
|
1189 ngx_queue_remove(&rn->queue);
|
|
|
1190
|
|
350
|
1191 rn->cnlen = (u_short) name.len;
|
|
|
1192 rn->u.cname = name.data;
|
|
|
1193 rn->valid = ngx_time() + r->valid;
|
|
|
1194 rn->expire = ngx_time() + r->expire;
|
|
|
1195
|
|
|
1196 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue);
|
|
|
1197
|
|
|
1198 ctx = rn->waiting;
|
|
|
1199 rn->waiting = NULL;
|
|
|
1200
|
|
|
1201 if (ctx) {
|
|
|
1202 ctx->name = name;
|
|
|
1203
|
|
|
1204 (void) ngx_resolve_name_locked(r, ctx);
|
|
|
1205 }
|
|
|
1206
|
|
|
1207 return;
|
|
|
1208 }
|
|
|
1209
|
|
|
1210 ngx_log_error(r->log_level, r->log, 0,
|
|
|
1211 "no A or CNAME types in DNS responses, unknown query type: %d",
|
|
|
1212 qtype);
|
|
|
1213 return;
|
|
|
1214
|
|
|
1215 short_response:
|
|
|
1216
|
|
|
1217 err = "short dns response";
|
|
|
1218
|
|
|
1219 invalid:
|
|
|
1220
|
|
|
1221 /* unlock name mutex */
|
|
|
1222
|
|
|
1223 ngx_log_error(r->log_level, r->log, 0, err);
|
|
|
1224
|
|
|
1225 return;
|
|
|
1226
|
|
|
1227 failed:
|
|
|
1228
|
|
|
1229 /* unlock name mutex */
|
|
|
1230
|
|
|
1231 return;
|
|
|
1232 }
|
|
|
1233
|
|
|
1234
|
|
|
1235 static void
|
|
|
1236 ngx_resolver_process_ptr(ngx_resolver_t *r, u_char *buf, size_t n,
|
|
356
|
1237 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan)
|
|
350
|
1238 {
|
|
|
1239 char *err;
|
|
|
1240 size_t len;
|
|
|
1241 in_addr_t addr;
|
|
|
1242 ngx_int_t digit;
|
|
|
1243 ngx_str_t name;
|
|
|
1244 ngx_uint_t i, mask, qtype, qclass, qident;
|
|
|
1245 ngx_resolver_an_t *an;
|
|
|
1246 ngx_resolver_ctx_t *ctx, *next;
|
|
|
1247 ngx_resolver_node_t *rn;
|
|
|
1248
|
|
|
1249 if (ngx_resolver_copy(r, NULL, buf, &buf[12], &buf[n]) != NGX_OK) {
|
|
|
1250 goto invalid_in_addr_arpa;
|
|
|
1251 }
|
|
|
1252
|
|
|
1253 addr = 0;
|
|
|
1254 i = 12;
|
|
|
1255
|
|
|
1256 for (mask = 0; mask < 32; mask += 8) {
|
|
|
1257 len = buf[i++];
|
|
|
1258
|
|
|
1259 digit = ngx_atoi(&buf[i], len);
|
|
|
1260 if (digit == NGX_ERROR || digit > 255) {
|
|
|
1261 goto invalid_in_addr_arpa;
|
|
|
1262 }
|
|
|
1263
|
|
|
1264 addr += digit << mask;
|
|
|
1265 i += len;
|
|
|
1266 }
|
|
|
1267
|
|
|
1268 if (ngx_strcmp(&buf[i], "\7in-addr\4arpa") != 0) {
|
|
|
1269 goto invalid_in_addr_arpa;
|
|
|
1270 }
|
|
|
1271
|
|
|
1272 /* lock addr mutex */
|
|
|
1273
|
|
|
1274 rn = ngx_resolver_lookup_addr(r, addr);
|
|
|
1275
|
|
|
1276 if (rn == NULL || rn->query == NULL) {
|
|
|
1277 ngx_log_error(r->log_level, r->log, 0,
|
|
|
1278 "unexpected response for %ud.%ud.%ud.%ud",
|
|
|
1279 (addr >> 24) & 0xff, (addr >> 16) & 0xff,
|
|
|
1280 (addr >> 8) & 0xff, addr & 0xff);
|
|
|
1281 goto failed;
|
|
|
1282 }
|
|
|
1283
|
|
|
1284 qident = (rn->query[0] << 8) + rn->query[1];
|
|
|
1285
|
|
|
1286 if (ident != qident) {
|
|
|
1287 ngx_log_error(r->log_level, r->log, 0,
|
|
|
1288 "wrong ident %d response for %ud.%ud.%ud.%ud, expect %d",
|
|
|
1289 ident, (addr >> 24) & 0xff, (addr >> 16) & 0xff,
|
|
|
1290 (addr >> 8) & 0xff, addr & 0xff, qident);
|
|
|
1291 goto failed;
|
|
|
1292 }
|
|
|
1293
|
|
356
|
1294 if (code == 0 && nan == 0) {
|
|
|
1295 code = 3; /* NXDOMAIN */
|
|
|
1296 }
|
|
|
1297
|
|
350
|
1298 if (code) {
|
|
|
1299 next = rn->waiting;
|
|
|
1300 rn->waiting = NULL;
|
|
|
1301
|
|
|
1302 ngx_queue_remove(&rn->queue);
|
|
|
1303
|
|
|
1304 ngx_rbtree_delete(&r->addr_rbtree, &rn->node);
|
|
|
1305
|
|
|
1306 ngx_resolver_free_node(r, rn);
|
|
|
1307
|
|
|
1308 /* unlock addr mutex */
|
|
|
1309
|
|
|
1310 while (next) {
|
|
|
1311 ctx = next;
|
|
|
1312 ctx->state = code;
|
|
|
1313 next = ctx->next;
|
|
|
1314
|
|
|
1315 ctx->handler(ctx);
|
|
|
1316 }
|
|
|
1317
|
|
|
1318 return;
|
|
|
1319 }
|
|
|
1320
|
|
|
1321 i += sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t);
|
|
|
1322
|
|
|
1323 if (i + 2 + sizeof(ngx_resolver_an_t) > (ngx_uint_t) n) {
|
|
|
1324 goto short_response;
|
|
|
1325 }
|
|
|
1326
|
|
|
1327 /* compression pointer to "XX.XX.XX.XX.in-addr.arpa */
|
|
|
1328
|
|
|
1329 if (buf[i] != 0xc0 || buf[i + 1] != 0x0c) {
|
|
|
1330 err = "invalid in-addr.arpa name in DNS response";
|
|
|
1331 goto invalid;
|
|
|
1332 }
|
|
|
1333
|
|
|
1334 an = (ngx_resolver_an_t *) &buf[i + 2];
|
|
|
1335
|
|
|
1336 qtype = (an->type_hi << 8) + an->type_lo;
|
|
|
1337 qclass = (an->class_hi << 8) + an->class_lo;
|
|
|
1338 len = (an->len_hi << 8) + an->len_lo;
|
|
|
1339
|
|
|
1340 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0,
|
|
|
1341 "resolver qt:%d cl:%d len:%uz", qtype, qclass, len);
|
|
|
1342
|
|
|
1343 i += 2 + sizeof(ngx_resolver_an_t);
|
|
|
1344
|
|
|
1345 if (i + len > (ngx_uint_t) n) {
|
|
|
1346 goto short_response;
|
|
|
1347 }
|
|
|
1348
|
|
|
1349 len -= 2;
|
|
|
1350
|
|
|
1351 if (ngx_resolver_copy(r, &name, buf, &buf[i], &buf[n]) != NGX_OK) {
|
|
|
1352 return;
|
|
|
1353 }
|
|
|
1354
|
|
|
1355 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver an:%V", &name);
|
|
|
1356
|
|
|
1357 if (len != (size_t) rn->nlen || ngx_strncmp(name.data, rn->name, len) != 0)
|
|
|
1358 {
|
|
|
1359 ngx_resolver_free(r, rn->name);
|
|
|
1360 rn->name = name.data;
|
|
|
1361
|
|
|
1362 name.data = ngx_resolver_dup(r, rn->name, len);
|
|
|
1363 if (name.data == NULL) {
|
|
|
1364 goto failed;
|
|
|
1365 }
|
|
|
1366 }
|
|
|
1367
|
|
|
1368 ngx_queue_remove(&rn->queue);
|
|
|
1369
|
|
|
1370 rn->valid = ngx_time() + r->valid;
|
|
|
1371 rn->expire = ngx_time() + r->expire;
|
|
|
1372
|
|
|
1373 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue);
|
|
|
1374
|
|
|
1375 next = rn->waiting;
|
|
|
1376 rn->waiting = NULL;
|
|
|
1377
|
|
|
1378 /* unlock addr mutex */
|
|
|
1379
|
|
|
1380 while (next) {
|
|
|
1381 ctx = next;
|
|
|
1382 ctx->state = NGX_OK;
|
|
|
1383 ctx->name = name;
|
|
|
1384 next = ctx->next;
|
|
|
1385
|
|
|
1386 ctx->handler(ctx);
|
|
|
1387 }
|
|
|
1388
|
|
|
1389 ngx_resolver_free(r, name.data);
|
|
|
1390
|
|
|
1391 return;
|
|
|
1392
|
|
|
1393 invalid_in_addr_arpa:
|
|
|
1394
|
|
|
1395 ngx_log_error(r->log_level, r->log, 0,
|
|
|
1396 "invalid in-addr.arpa name in DNS response");
|
|
|
1397 return;
|
|
|
1398
|
|
|
1399 short_response:
|
|
|
1400
|
|
|
1401 err = "short DNS response";
|
|
|
1402
|
|
|
1403 invalid:
|
|
|
1404
|
|
|
1405 /* unlock addr mutex */
|
|
|
1406
|
|
|
1407 ngx_log_error(r->log_level, r->log, 0, err);
|
|
|
1408
|
|
|
1409 return;
|
|
|
1410
|
|
|
1411 failed:
|
|
|
1412
|
|
|
1413 /* unlock addr mutex */
|
|
|
1414
|
|
|
1415 return;
|
|
|
1416 }
|
|
|
1417
|
|
|
1418
|
|
|
1419 static ngx_resolver_node_t *
|
|
|
1420 ngx_resolver_lookup_name(ngx_resolver_t *r, ngx_str_t *name, uint32_t hash)
|
|
|
1421 {
|
|
|
1422 ngx_int_t rc;
|
|
|
1423 size_t len;
|
|
|
1424 ngx_rbtree_node_t *node, *sentinel;
|
|
|
1425 ngx_resolver_node_t *rn;
|
|
|
1426
|
|
|
1427 node = r->name_rbtree.root;
|
|
|
1428 sentinel = r->name_rbtree.sentinel;
|
|
|
1429
|
|
|
1430 while (node != sentinel) {
|
|
|
1431
|
|
|
1432 if (hash < node->key) {
|
|
|
1433 node = node->left;
|
|
|
1434 continue;
|
|
|
1435 }
|
|
|
1436
|
|
|
1437 if (hash > node->key) {
|
|
|
1438 node = node->right;
|
|
|
1439 continue;
|
|
|
1440 }
|
|
|
1441
|
|
|
1442 /* hash == node->key */
|
|
|
1443
|
|
|
1444 do {
|
|
|
1445 rn = (ngx_resolver_node_t *) node;
|
|
|
1446
|
|
|
1447 len = (name->len > (size_t) rn->nlen) ? rn->nlen : name->len;
|
|
|
1448
|
|
|
1449 rc = ngx_strncmp(name->data, rn->name, len);
|
|
|
1450
|
|
|
1451 if (rc == 0) {
|
|
|
1452 return rn;
|
|
|
1453 }
|
|
|
1454
|
|
|
1455 node = (rc < 0) ? node->left : node->right;
|
|
|
1456
|
|
|
1457 } while (node != sentinel && hash == node->key);
|
|
|
1458
|
|
|
1459 break;
|
|
|
1460 }
|
|
|
1461
|
|
|
1462 /* not found */
|
|
|
1463
|
|
|
1464 return NULL;
|
|
|
1465 }
|
|
|
1466
|
|
|
1467
|
|
|
1468 static ngx_resolver_node_t *
|
|
|
1469 ngx_resolver_lookup_addr(ngx_resolver_t *r, in_addr_t addr)
|
|
|
1470 {
|
|
|
1471 ngx_rbtree_node_t *node, *sentinel;
|
|
|
1472
|
|
|
1473 node = r->addr_rbtree.root;
|
|
|
1474 sentinel = r->addr_rbtree.sentinel;
|
|
|
1475
|
|
|
1476 while (node != sentinel) {
|
|
|
1477
|
|
|
1478 if (addr < node->key) {
|
|
|
1479 node = node->left;
|
|
|
1480 continue;
|
|
|
1481 }
|
|
|
1482
|
|
|
1483 if (addr > node->key) {
|
|
|
1484 node = node->right;
|
|
|
1485 continue;
|
|
|
1486 }
|
|
|
1487
|
|
|
1488 /* addr == node->key */
|
|
|
1489
|
|
|
1490 return (ngx_resolver_node_t *) node;
|
|
|
1491 }
|
|
|
1492
|
|
|
1493 /* not found */
|
|
|
1494
|
|
|
1495 return NULL;
|
|
|
1496 }
|
|
|
1497
|
|
|
1498
|
|
|
1499 static void
|
|
|
1500 ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp,
|
|
|
1501 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel)
|
|
|
1502 {
|
|
|
1503 size_t len;
|
|
|
1504 ngx_rbtree_node_t **p;
|
|
|
1505 ngx_resolver_node_t *rn, *rn_temp;
|
|
|
1506
|
|
|
1507 for ( ;; ) {
|
|
|
1508
|
|
|
1509 if (node->key < temp->key) {
|
|
|
1510
|
|
|
1511 p = &temp->left;
|
|
|
1512
|
|
|
1513 } else if (node->key > temp->key) {
|
|
|
1514
|
|
|
1515 p = &temp->right;
|
|
|
1516
|
|
|
1517 } else { /* node->key == temp->key */
|
|
|
1518
|
|
|
1519 rn = (ngx_resolver_node_t *) node;
|
|
|
1520 rn_temp = (ngx_resolver_node_t *) temp;
|
|
|
1521
|
|
|
1522 len = (rn->nlen > rn_temp->nlen) ? rn_temp->nlen : rn->nlen;
|
|
|
1523
|
|
|
1524 p = (ngx_strncmp(rn->name, rn_temp->name, len) < 0)
|
|
|
1525 ? &temp->left : &temp->right;
|
|
|
1526 }
|
|
|
1527
|
|
|
1528 if (*p == sentinel) {
|
|
|
1529 break;
|
|
|
1530 }
|
|
|
1531
|
|
|
1532 temp = *p;
|
|
|
1533 }
|
|
|
1534
|
|
|
1535 *p = node;
|
|
|
1536 node->parent = temp;
|
|
|
1537 node->left = sentinel;
|
|
|
1538 node->right = sentinel;
|
|
|
1539 ngx_rbt_red(node);
|
|
|
1540 }
|
|
|
1541
|
|
|
1542
|
|
|
1543 static ngx_int_t
|
|
|
1544 ngx_resolver_create_name_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx)
|
|
|
1545 {
|
|
|
1546 u_char *p, *s;
|
|
|
1547 size_t len;
|
|
|
1548 ngx_uint_t ident;
|
|
|
1549 ngx_resolver_qs_t *qs;
|
|
|
1550 ngx_resolver_query_t *query;
|
|
|
1551
|
|
|
1552 len = sizeof(ngx_resolver_query_t)
|
|
|
1553 + 1 + ctx->name.len + 1 + sizeof(ngx_resolver_qs_t);
|
|
|
1554
|
|
|
1555 p = ngx_resolver_calloc(ctx->resolver, len);
|
|
|
1556 if (p == NULL) {
|
|
|
1557 return NGX_ERROR;
|
|
|
1558 }
|
|
|
1559
|
|
|
1560 rn->qlen = (u_short) len;
|
|
|
1561 rn->query = p;
|
|
|
1562
|
|
|
1563 query = (ngx_resolver_query_t *) p;
|
|
|
1564
|
|
|
1565 ident = ngx_random();
|
|
|
1566
|
|
|
1567 ngx_log_debug2(NGX_LOG_DEBUG_CORE, ctx->resolver->log, 0,
|
|
|
1568 "resolve: \"%V\" %i", &ctx->name, ident & 0xffff);
|
|
|
1569
|
|
|
1570 query->ident_hi = (u_char) ((ident >> 8) & 0xff);
|
|
|
1571 query->ident_lo = (u_char) (ident & 0xff);
|
|
|
1572
|
|
|
1573 /* recursion query */
|
|
|
1574 query->flags_hi = 1; query->flags_lo = 0;
|
|
|
1575
|
|
|
1576 /* one question */
|
|
|
1577 query->nqs_hi = 0; query->nqs_lo = 1;
|
|
|
1578 query->nan_hi = 0; query->nan_lo = 0;
|
|
|
1579 query->nns_hi = 0; query->nns_lo = 0;
|
|
|
1580 query->nar_hi = 0; query->nar_lo = 0;
|
|
|
1581
|
|
|
1582 p += sizeof(ngx_resolver_query_t) + 1 + ctx->name.len + 1;
|
|
|
1583
|
|
|
1584 qs = (ngx_resolver_qs_t *) p;
|
|
|
1585
|
|
|
1586 /* query type */
|
|
|
1587 qs->type_hi = 0; qs->type_lo = (u_char) ctx->type;
|
|
|
1588
|
|
|
1589 /* IP query class */
|
|
|
1590 qs->class_hi = 0; qs->class_lo = 1;
|
|
|
1591
|
|
|
1592 /* convert "www.example.com" to "\3www\7example\3com\0" */
|
|
|
1593
|
|
|
1594 len = 0;
|
|
|
1595 p--;
|
|
|
1596 *p-- = '\0';
|
|
|
1597
|
|
|
1598 for (s = ctx->name.data + ctx->name.len - 1; s >= ctx->name.data; s--) {
|
|
|
1599 if (*s != '.') {
|
|
|
1600 *p = *s;
|
|
|
1601 len++;
|
|
|
1602
|
|
|
1603 } else {
|
|
|
1604 *p = (u_char) len;
|
|
|
1605 len = 0;
|
|
|
1606 }
|
|
|
1607
|
|
|
1608 p--;
|
|
|
1609 }
|
|
|
1610
|
|
|
1611 *p = (u_char) len;
|
|
|
1612
|
|
|
1613 return NGX_OK;
|
|
|
1614 }
|
|
|
1615
|
|
|
1616
|
|
|
1617 /* AF_INET only */
|
|
|
1618
|
|
|
1619 static ngx_int_t
|
|
|
1620 ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx)
|
|
|
1621 {
|
|
|
1622 u_char *p, *d;
|
|
|
1623 size_t len;
|
|
|
1624 ngx_int_t n;
|
|
|
1625 ngx_uint_t ident;
|
|
|
1626 ngx_resolver_query_t *query;
|
|
|
1627
|
|
|
1628 len = sizeof(ngx_resolver_query_t)
|
|
|
1629 + sizeof(".255.255.255.255.in-addr.arpa.") - 1
|
|
|
1630 + sizeof(ngx_resolver_qs_t);
|
|
|
1631
|
|
|
1632 p = ngx_resolver_calloc(ctx->resolver, len);
|
|
|
1633 if (p == NULL) {
|
|
|
1634 return NGX_ERROR;
|
|
|
1635 }
|
|
|
1636
|
|
|
1637 rn->query = p;
|
|
|
1638 query = (ngx_resolver_query_t *) p;
|
|
|
1639
|
|
|
1640 ident = ngx_random();
|
|
|
1641
|
|
|
1642 query->ident_hi = (u_char) ((ident >> 8) & 0xff);
|
|
|
1643 query->ident_lo = (u_char) (ident & 0xff);
|
|
|
1644
|
|
|
1645 /* recursion query */
|
|
|
1646 query->flags_hi = 1; query->flags_lo = 0;
|
|
|
1647
|
|
|
1648 /* one question */
|
|
|
1649 query->nqs_hi = 0; query->nqs_lo = 1;
|
|
|
1650 query->nan_hi = 0; query->nan_lo = 0;
|
|
|
1651 query->nns_hi = 0; query->nns_lo = 0;
|
|
|
1652 query->nar_hi = 0; query->nar_lo = 0;
|
|
|
1653
|
|
|
1654 p += sizeof(ngx_resolver_query_t);
|
|
|
1655
|
|
|
1656 for (n = 0; n < 32; n += 8){
|
|
|
1657 d = ngx_sprintf(&p[1], "%ud", (ctx->addr >> n) & 0xff);
|
|
|
1658 *p = (u_char) (d - &p[1]);
|
|
|
1659 p = d;
|
|
|
1660 }
|
|
|
1661
|
|
|
1662 /* query type "PTR", IP query class */
|
|
|
1663 ngx_memcpy(p, "\7in-addr\4arpa\0\0\14\0\1", 18);
|
|
|
1664
|
|
|
1665 rn->qlen = (u_short)
|
|
|
1666 (p + sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t)
|
|
|
1667 - rn->query);
|
|
|
1668
|
|
|
1669 return NGX_OK;
|
|
|
1670 }
|
|
|
1671
|
|
|
1672
|
|
|
1673 static ngx_int_t
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|
1674 ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, u_char *buf, u_char *src,
|
|
|
1675 u_char *last)
|
|
|
1676 {
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|
|
1677 char *err;
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|
|
1678 u_char *p, *dst;
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|
|
1679 ssize_t len;
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|
|
1680 ngx_uint_t i, n;
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|
|
1681
|
|
|
1682 p = src;
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|
|
1683 len = -1;
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|
|
1684
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|
1685 /*
|
|
|
1686 * compression pointers allow to create endless loop, so we set limit;
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|
|
1687 * 128 pointers should be enough to store 255-byte name
|
|
|
1688 */
|
|
|
1689
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|
|
1690 for (i = 0; i < 128; i++) {
|
|
|
1691 n = *p++;
|
|
|
1692
|
|
|
1693 if (n == 0) {
|
|
|
1694 goto done;
|
|
|
1695 }
|
|
|
1696
|
|
|
1697 if (n & 0xc0) {
|
|
|
1698 n = (n & 0x3f << 8) + *p;
|
|
|
1699 p = &buf[n];
|
|
|
1700
|
|
|
1701 } else {
|
|
|
1702 len += 1 + n;
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|
|
1703 p = &p[n];
|
|
|
1704 }
|
|
|
1705
|
|
|
1706 if (p >= last) {
|
|
|
1707 err = "name is out of response";
|
|
|
1708 goto invalid;
|
|
|
1709 }
|
|
|
1710 }
|
|
|
1711
|
|
|
1712 err = "compression pointers loop";
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|
|
1713
|
|
|
1714 invalid:
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|
|
1715
|
|
|
1716 ngx_log_error(r->log_level, r->log, 0, err);
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|
|
1717
|
|
|
1718 return NGX_ERROR;
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|
|
1719
|
|
|
1720 done:
|
|
|
1721
|
|
|
1722 if (name == NULL) {
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|
|
1723 return NGX_OK;
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|
|
1724 }
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|
|
1725
|
|
|
1726 dst = ngx_resolver_alloc(r, len);
|
|
|
1727 if (dst == NULL) {
|
|
|
1728 return NGX_ERROR;
|
|
|
1729 }
|
|
|
1730
|
|
|
1731 name->data = dst;
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|
|
1732
|
|
|
1733 n = *src++;
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|
|
1734
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|
|
1735 for ( ;; ) {
|
|
|
1736 if (n != 0xc0) {
|
|
|
1737 ngx_memcpy(dst, src, n);
|
|
|
1738 dst += n;
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|
|
1739 src += n;
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|
|
1740
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|
|
1741 n = *src++;
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|
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1742
|
|
|
1743 if (n != 0) {
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|
|
1744 *dst++ = '.';
|
|
|
1745 }
|
|
|
1746
|
|
|
1747 } else {
|
|
|
1748 n = (n & 0x3f << 8) + *src;
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|
|
1749 src = &buf[n];
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|
|
1750
|
|
|
1751 n = *src++;
|
|
|
1752 }
|
|
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1753
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|
|
1754 if (n == 0) {
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|
|
1755 name->len = dst - name->data;
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|
|
1756 return NGX_OK;
|
|
|
1757 }
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|
|
1758 }
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|
|
1759 }
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|
|
1760
|
|
|
1761
|
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|
1762 static void
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1763 ngx_resolver_timeout_handler(ngx_event_t *ev)
|
|
|
1764 {
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|
|
1765 ngx_resolver_ctx_t *ctx;
|
|
|
1766
|
|
|
1767 ctx = ev->data;
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|
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1768
|
|
|
1769 ctx->state = NGX_RESOLVE_TIMEDOUT;
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|
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1770
|
|
|
1771 ctx->handler(ctx);
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|
|
1772 }
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|
|
1773
|
|
|
1774
|
|
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1775 static void
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1776 ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn)
|
|
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1777 {
|
|
|
1778 /* lock alloc mutex */
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|
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1779
|
|
|
1780 if (rn->query) {
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|
|
1781 ngx_resolver_free_locked(r, rn->query);
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|
|
1782 }
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|
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1783
|
|
|
1784 if (rn->name) {
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|
|
1785 ngx_resolver_free_locked(r, rn->name);
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|
|
1786 }
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|
|
1787
|
|
|
1788 if (rn->cnlen) {
|
|
|
1789 ngx_resolver_free_locked(r, rn->u.cname);
|
|
|
1790 }
|
|
|
1791
|
|
|
1792 if (rn->naddrs > 1) {
|
|
|
1793 ngx_resolver_free_locked(r, rn->u.addrs);
|
|
|
1794 }
|
|
|
1795
|
|
|
1796 ngx_resolver_free_locked(r, rn);
|
|
|
1797
|
|
|
1798 /* unlock alloc mutex */
|
|
|
1799 }
|
|
|
1800
|
|
|
1801
|
|
|
1802 static void *
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|
|
1803 ngx_resolver_alloc(ngx_resolver_t *r, size_t size)
|
|
|
1804 {
|
|
|
1805 u_char *p;
|
|
|
1806
|
|
|
1807 /* lock alloc mutex */
|
|
|
1808
|
|
|
1809 p = ngx_alloc(size, r->log);
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|
|
1810
|
|
|
1811 /* unlock alloc mutex */
|
|
|
1812
|
|
|
1813 return p;
|
|
|
1814 }
|
|
|
1815
|
|
|
1816
|
|
|
1817 void *
|
|
|
1818 ngx_resolver_calloc(ngx_resolver_t *r, size_t size)
|
|
|
1819 {
|
|
|
1820 u_char *p;
|
|
|
1821
|
|
|
1822 p = ngx_resolver_alloc(r, size);
|
|
|
1823
|
|
|
1824 if (p) {
|
|
|
1825 ngx_memzero(p, size);
|
|
|
1826 }
|
|
|
1827
|
|
|
1828 return p;
|
|
|
1829 }
|
|
|
1830
|
|
|
1831
|
|
|
1832 static void
|
|
|
1833 ngx_resolver_free(ngx_resolver_t *r, void *p)
|
|
|
1834 {
|
|
|
1835 /* lock alloc mutex */
|
|
|
1836
|
|
|
1837 ngx_free(p);
|
|
|
1838
|
|
|
1839 /* unlock alloc mutex */
|
|
|
1840 }
|
|
|
1841
|
|
|
1842
|
|
|
1843 static void
|
|
|
1844 ngx_resolver_free_locked(ngx_resolver_t *r, void *p)
|
|
|
1845 {
|
|
|
1846 ngx_free(p);
|
|
|
1847 }
|
|
|
1848
|
|
|
1849
|
|
|
1850 static void *
|
|
|
1851 ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size)
|
|
|
1852 {
|
|
|
1853 void *dst;
|
|
|
1854
|
|
|
1855 dst = ngx_resolver_alloc(r, size);
|
|
|
1856
|
|
|
1857 if (dst == NULL) {
|
|
|
1858 return dst;
|
|
|
1859 }
|
|
|
1860
|
|
|
1861 ngx_memcpy(dst, src, size);
|
|
|
1862
|
|
|
1863 return dst;
|
|
|
1864 }
|
|
|
1865
|
|
|
1866
|
|
|
1867 char *
|
|
|
1868 ngx_resolver_strerror(ngx_int_t err)
|
|
|
1869 {
|
|
|
1870 static char *errors[] = {
|
|
|
1871 "Format error", /* FORMERR */
|
|
|
1872 "Server failure", /* SERVFAIL */
|
|
|
1873 "Host not found", /* NXDOMAIN */
|
|
|
1874 "Unimplemented", /* NOTIMP */
|
|
|
1875 "Operation refused" /* REFUSED */
|
|
|
1876 };
|
|
|
1877
|
|
|
1878 if (err > 0 && err < 6) {
|
|
|
1879 return errors[err - 1];
|
|
|
1880 }
|
|
|
1881
|
|
|
1882 if (err == NGX_RESOLVE_TIMEDOUT) {
|
|
|
1883 return "Operation timed out";
|
|
|
1884 }
|
|
|
1885
|
|
|
1886 return "Unknown error";
|
|
|
1887 }
|
|
|
1888
|
|
|
1889
|
|
|
1890 ngx_int_t
|
|
|
1891 ngx_udp_connect(ngx_udp_connection_t *uc)
|
|
|
1892 {
|
|
|
1893 int rc;
|
|
|
1894 ngx_int_t event;
|
|
|
1895 ngx_event_t *rev, *wev;
|
|
|
1896 ngx_socket_t s;
|
|
|
1897 ngx_connection_t *c;
|
|
|
1898
|
|
|
1899 s = ngx_socket(AF_INET, SOCK_DGRAM, 0);
|
|
|
1900
|
|
|
1901 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, uc->log, 0, "UDP socket %d", s);
|
|
|
1902
|
|
|
1903 if (s == -1) {
|
|
|
1904 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno,
|
|
|
1905 ngx_socket_n " failed");
|
|
|
1906 return NGX_ERROR;
|
|
|
1907 }
|
|
|
1908
|
|
|
1909 c = ngx_get_connection(s, uc->log);
|
|
|
1910
|
|
|
1911 if (c == NULL) {
|
|
|
1912 if (ngx_close_socket(s) == -1) {
|
|
|
1913 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno,
|
|
|
1914 ngx_close_socket_n "failed");
|
|
|
1915 }
|
|
|
1916
|
|
|
1917 return NGX_ERROR;
|
|
|
1918 }
|
|
|
1919
|
|
|
1920 if (ngx_nonblocking(s) == -1) {
|
|
|
1921 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno,
|
|
|
1922 ngx_nonblocking_n " failed");
|
|
|
1923
|
|
|
1924 ngx_free_connection(c);
|
|
|
1925
|
|
|
1926 if (ngx_close_socket(s) == -1) {
|
|
|
1927 ngx_log_error(NGX_LOG_ALERT, uc->log, ngx_socket_errno,
|
|
|
1928 ngx_close_socket_n " failed");
|
|
|
1929 }
|
|
|
1930
|
|
|
1931 return NGX_ERROR;
|
|
|
1932 }
|
|
|
1933
|
|
|
1934 rev = c->read;
|
|
|
1935 wev = c->write;
|
|
|
1936
|
|
|
1937 rev->log = uc->log;
|
|
|
1938 wev->log = uc->log;
|
|
|
1939
|
|
|
1940 uc->connection = c;
|
|
|
1941
|
|
|
1942 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1);
|
|
|
1943
|
|
|
1944 #if (NGX_THREADS)
|
|
|
1945
|
|
|
1946 /* TODO: lock event when call completion handler */
|
|
|
1947
|
|
|
1948 rev->lock = &c->lock;
|
|
|
1949 wev->lock = &c->lock;
|
|
|
1950 rev->own_lock = &c->lock;
|
|
|
1951 wev->own_lock = &c->lock;
|
|
|
1952
|
|
|
1953 #endif
|
|
|
1954
|
|
|
1955 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, uc->log, 0,
|
|
|
1956 "connect to %V, fd:%d #%d", &uc->server, s, c->number);
|
|
|
1957
|
|
|
1958 rc = connect(s, uc->sockaddr, uc->socklen);
|
|
|
1959
|
|
|
1960 /* TODO: aio, iocp */
|
|
|
1961
|
|
|
1962 if (rc == -1) {
|
|
|
1963 ngx_log_error(NGX_LOG_CRIT, uc->log, ngx_socket_errno,
|
|
|
1964 "connect() to %V failed", &uc->server);
|
|
|
1965
|
|
|
1966 return NGX_ERROR;
|
|
|
1967 }
|
|
|
1968
|
|
|
1969 /* UDP sockets are always ready to write */
|
|
|
1970 wev->ready = 1;
|
|
|
1971
|
|
|
1972 if (ngx_add_event) {
|
|
|
1973
|
|
|
1974 event = (ngx_event_flags & NGX_USE_CLEAR_EVENT) ?
|
|
|
1975 /* kqueue, epoll */ NGX_CLEAR_EVENT:
|
|
|
1976 /* select, poll, /dev/poll */ NGX_LEVEL_EVENT;
|
|
|
1977 /* eventport event type has no meaning: oneshot only */
|
|
|
1978
|
|
|
1979 if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) {
|
|
|
1980 return NGX_ERROR;
|
|
|
1981 }
|
|
|
1982
|
|
|
1983 } else {
|
|
|
1984 /* rtsig */
|
|
|
1985
|
|
|
1986 if (ngx_add_conn(c) == NGX_ERROR) {
|
|
|
1987 return NGX_ERROR;
|
|
|
1988 }
|
|
|
1989 }
|
|
|
1990
|
|
|
1991 return NGX_OK;
|
|
|
1992 }
|
