Mercurial > hg > nginx-quic
annotate src/event/ngx_event_udp.c @ 7391:27559d4a5151
Stream: fixed possible use of a freed connection.
The session handler may result in session termination, thus a connection
pool (from which c->udp was allocated) may be destroyed.
author | Vladimir Homutov <vl@nginx.com> |
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date | Wed, 07 Nov 2018 13:22:14 +0300 |
parents | d27aa9060c95 |
children | 4698cede59ff |
rev | line source |
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7285
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1 |
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2 /* |
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3 * Copyright (C) Roman Arutyunyan |
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4 * Copyright (C) Nginx, Inc. |
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5 */ |
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6 |
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7 |
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8 #include <ngx_config.h> |
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9 #include <ngx_core.h> |
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10 #include <ngx_event.h> |
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11 |
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12 |
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13 #if !(NGX_WIN32) |
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14 |
7286 | 15 struct ngx_udp_connection_s { |
16 ngx_rbtree_node_t node; | |
17 ngx_connection_t *connection; | |
18 ngx_buf_t *buffer; | |
19 }; | |
20 | |
21 | |
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22 static void ngx_close_accepted_udp_connection(ngx_connection_t *c); |
7286 | 23 static ssize_t ngx_udp_shared_recv(ngx_connection_t *c, u_char *buf, |
24 size_t size); | |
25 static ngx_int_t ngx_insert_udp_connection(ngx_connection_t *c); | |
26 static void ngx_delete_udp_connection(void *data); | |
27 static ngx_connection_t *ngx_lookup_udp_connection(ngx_listening_t *ls, | |
28 struct sockaddr *sockaddr, socklen_t socklen, | |
29 struct sockaddr *local_sockaddr, socklen_t local_socklen); | |
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30 |
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31 |
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32 void |
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33 ngx_event_recvmsg(ngx_event_t *ev) |
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34 { |
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35 ssize_t n; |
7286 | 36 ngx_buf_t buf; |
7285
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37 ngx_log_t *log; |
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38 ngx_err_t err; |
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39 socklen_t socklen, local_socklen; |
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40 ngx_event_t *rev, *wev; |
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41 struct iovec iov[1]; |
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42 struct msghdr msg; |
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43 ngx_sockaddr_t sa, lsa; |
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44 struct sockaddr *sockaddr, *local_sockaddr; |
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45 ngx_listening_t *ls; |
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46 ngx_event_conf_t *ecf; |
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47 ngx_connection_t *c, *lc; |
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48 static u_char buffer[65535]; |
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49 |
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50 #if (NGX_HAVE_MSGHDR_MSG_CONTROL) |
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51 |
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52 #if (NGX_HAVE_IP_RECVDSTADDR) |
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53 u_char msg_control[CMSG_SPACE(sizeof(struct in_addr))]; |
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54 #elif (NGX_HAVE_IP_PKTINFO) |
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55 u_char msg_control[CMSG_SPACE(sizeof(struct in_pktinfo))]; |
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56 #endif |
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57 |
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58 #if (NGX_HAVE_INET6 && NGX_HAVE_IPV6_RECVPKTINFO) |
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59 u_char msg_control6[CMSG_SPACE(sizeof(struct in6_pktinfo))]; |
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60 #endif |
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61 |
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62 #endif |
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63 |
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64 if (ev->timedout) { |
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65 if (ngx_enable_accept_events((ngx_cycle_t *) ngx_cycle) != NGX_OK) { |
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66 return; |
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67 } |
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68 |
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69 ev->timedout = 0; |
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70 } |
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71 |
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72 ecf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_event_core_module); |
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73 |
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74 if (!(ngx_event_flags & NGX_USE_KQUEUE_EVENT)) { |
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75 ev->available = ecf->multi_accept; |
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76 } |
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77 |
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78 lc = ev->data; |
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79 ls = lc->listening; |
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80 ev->ready = 0; |
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81 |
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82 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0, |
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83 "recvmsg on %V, ready: %d", &ls->addr_text, ev->available); |
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84 |
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85 do { |
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86 ngx_memzero(&msg, sizeof(struct msghdr)); |
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87 |
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88 iov[0].iov_base = (void *) buffer; |
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89 iov[0].iov_len = sizeof(buffer); |
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90 |
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91 msg.msg_name = &sa; |
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92 msg.msg_namelen = sizeof(ngx_sockaddr_t); |
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93 msg.msg_iov = iov; |
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94 msg.msg_iovlen = 1; |
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95 |
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96 #if (NGX_HAVE_MSGHDR_MSG_CONTROL) |
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97 |
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98 if (ls->wildcard) { |
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99 |
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100 #if (NGX_HAVE_IP_RECVDSTADDR || NGX_HAVE_IP_PKTINFO) |
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101 if (ls->sockaddr->sa_family == AF_INET) { |
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102 msg.msg_control = &msg_control; |
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103 msg.msg_controllen = sizeof(msg_control); |
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104 } |
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105 #endif |
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106 |
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107 #if (NGX_HAVE_INET6 && NGX_HAVE_IPV6_RECVPKTINFO) |
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108 if (ls->sockaddr->sa_family == AF_INET6) { |
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109 msg.msg_control = &msg_control6; |
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110 msg.msg_controllen = sizeof(msg_control6); |
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111 } |
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112 #endif |
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113 } |
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114 |
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115 #endif |
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116 |
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117 n = recvmsg(lc->fd, &msg, 0); |
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118 |
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119 if (n == -1) { |
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120 err = ngx_socket_errno; |
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121 |
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122 if (err == NGX_EAGAIN) { |
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123 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, ev->log, err, |
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124 "recvmsg() not ready"); |
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125 return; |
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126 } |
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127 |
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128 ngx_log_error(NGX_LOG_ALERT, ev->log, err, "recvmsg() failed"); |
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129 |
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130 return; |
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131 } |
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132 |
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133 #if (NGX_HAVE_MSGHDR_MSG_CONTROL) |
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134 if (msg.msg_flags & (MSG_TRUNC|MSG_CTRUNC)) { |
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135 ngx_log_error(NGX_LOG_ALERT, ev->log, 0, |
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136 "recvmsg() truncated data"); |
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137 continue; |
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138 } |
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139 #endif |
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140 |
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141 sockaddr = msg.msg_name; |
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142 socklen = msg.msg_namelen; |
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143 |
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144 if (socklen > (socklen_t) sizeof(ngx_sockaddr_t)) { |
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145 socklen = sizeof(ngx_sockaddr_t); |
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146 } |
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147 |
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148 if (socklen == 0) { |
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149 |
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150 /* |
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151 * on Linux recvmsg() returns zero msg_namelen |
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152 * when receiving packets from unbound AF_UNIX sockets |
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153 */ |
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154 |
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155 socklen = sizeof(struct sockaddr); |
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156 ngx_memzero(&sa, sizeof(struct sockaddr)); |
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157 sa.sockaddr.sa_family = ls->sockaddr->sa_family; |
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158 } |
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159 |
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160 local_sockaddr = ls->sockaddr; |
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161 local_socklen = ls->socklen; |
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162 |
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163 #if (NGX_HAVE_MSGHDR_MSG_CONTROL) |
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164 |
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165 if (ls->wildcard) { |
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166 struct cmsghdr *cmsg; |
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167 |
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168 ngx_memcpy(&lsa, local_sockaddr, local_socklen); |
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169 local_sockaddr = &lsa.sockaddr; |
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170 |
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171 for (cmsg = CMSG_FIRSTHDR(&msg); |
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172 cmsg != NULL; |
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173 cmsg = CMSG_NXTHDR(&msg, cmsg)) |
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174 { |
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175 |
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176 #if (NGX_HAVE_IP_RECVDSTADDR) |
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177 |
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178 if (cmsg->cmsg_level == IPPROTO_IP |
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179 && cmsg->cmsg_type == IP_RECVDSTADDR |
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180 && local_sockaddr->sa_family == AF_INET) |
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181 { |
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182 struct in_addr *addr; |
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183 struct sockaddr_in *sin; |
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184 |
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185 addr = (struct in_addr *) CMSG_DATA(cmsg); |
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186 sin = (struct sockaddr_in *) local_sockaddr; |
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187 sin->sin_addr = *addr; |
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188 |
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189 break; |
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190 } |
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191 |
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192 #elif (NGX_HAVE_IP_PKTINFO) |
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193 |
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194 if (cmsg->cmsg_level == IPPROTO_IP |
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195 && cmsg->cmsg_type == IP_PKTINFO |
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196 && local_sockaddr->sa_family == AF_INET) |
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197 { |
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198 struct in_pktinfo *pkt; |
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199 struct sockaddr_in *sin; |
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200 |
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201 pkt = (struct in_pktinfo *) CMSG_DATA(cmsg); |
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202 sin = (struct sockaddr_in *) local_sockaddr; |
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203 sin->sin_addr = pkt->ipi_addr; |
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204 |
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205 break; |
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206 } |
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207 |
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208 #endif |
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209 |
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210 #if (NGX_HAVE_INET6 && NGX_HAVE_IPV6_RECVPKTINFO) |
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211 |
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212 if (cmsg->cmsg_level == IPPROTO_IPV6 |
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213 && cmsg->cmsg_type == IPV6_PKTINFO |
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214 && local_sockaddr->sa_family == AF_INET6) |
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215 { |
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216 struct in6_pktinfo *pkt6; |
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217 struct sockaddr_in6 *sin6; |
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218 |
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219 pkt6 = (struct in6_pktinfo *) CMSG_DATA(cmsg); |
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220 sin6 = (struct sockaddr_in6 *) local_sockaddr; |
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221 sin6->sin6_addr = pkt6->ipi6_addr; |
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222 |
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223 break; |
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224 } |
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225 |
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226 #endif |
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227 |
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228 } |
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229 } |
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230 |
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231 #endif |
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232 |
7286 | 233 c = ngx_lookup_udp_connection(ls, sockaddr, socklen, local_sockaddr, |
234 local_socklen); | |
235 | |
236 if (c) { | |
237 | |
238 #if (NGX_DEBUG) | |
239 if (c->log->log_level & NGX_LOG_DEBUG_EVENT) { | |
240 ngx_log_handler_pt handler; | |
241 | |
242 handler = c->log->handler; | |
243 c->log->handler = NULL; | |
244 | |
245 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0, | |
246 "recvmsg: fd:%d n:%z", c->fd, n); | |
247 | |
248 c->log->handler = handler; | |
249 } | |
250 #endif | |
251 | |
252 ngx_memzero(&buf, sizeof(ngx_buf_t)); | |
253 | |
254 buf.pos = buffer; | |
255 buf.last = buffer + n; | |
256 | |
257 rev = c->read; | |
258 | |
259 c->udp->buffer = &buf; | |
260 rev->ready = 1; | |
261 | |
262 rev->handler(rev); | |
263 | |
7391
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264 if (c->udp) { |
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265 c->udp->buffer = NULL; |
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266 } |
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267 |
7286 | 268 rev->ready = 0; |
269 | |
270 goto next; | |
271 } | |
272 | |
7285
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273 #if (NGX_STAT_STUB) |
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274 (void) ngx_atomic_fetch_add(ngx_stat_accepted, 1); |
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275 #endif |
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276 |
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277 ngx_accept_disabled = ngx_cycle->connection_n / 8 |
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278 - ngx_cycle->free_connection_n; |
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279 |
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280 c = ngx_get_connection(lc->fd, ev->log); |
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281 if (c == NULL) { |
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282 return; |
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283 } |
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284 |
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285 c->shared = 1; |
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286 c->type = SOCK_DGRAM; |
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287 c->socklen = socklen; |
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288 |
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289 #if (NGX_STAT_STUB) |
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290 (void) ngx_atomic_fetch_add(ngx_stat_active, 1); |
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291 #endif |
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292 |
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293 c->pool = ngx_create_pool(ls->pool_size, ev->log); |
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294 if (c->pool == NULL) { |
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295 ngx_close_accepted_udp_connection(c); |
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296 return; |
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297 } |
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298 |
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299 c->sockaddr = ngx_palloc(c->pool, socklen); |
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300 if (c->sockaddr == NULL) { |
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301 ngx_close_accepted_udp_connection(c); |
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302 return; |
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303 } |
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304 |
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305 ngx_memcpy(c->sockaddr, sockaddr, socklen); |
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306 |
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307 log = ngx_palloc(c->pool, sizeof(ngx_log_t)); |
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308 if (log == NULL) { |
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309 ngx_close_accepted_udp_connection(c); |
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310 return; |
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311 } |
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312 |
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313 *log = ls->log; |
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314 |
7286 | 315 c->recv = ngx_udp_shared_recv; |
7285
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316 c->send = ngx_udp_send; |
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317 c->send_chain = ngx_udp_send_chain; |
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318 |
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319 c->log = log; |
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320 c->pool->log = log; |
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321 c->listening = ls; |
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322 |
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323 if (local_sockaddr == &lsa.sockaddr) { |
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324 local_sockaddr = ngx_palloc(c->pool, local_socklen); |
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325 if (local_sockaddr == NULL) { |
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326 ngx_close_accepted_udp_connection(c); |
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327 return; |
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328 } |
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329 |
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330 ngx_memcpy(local_sockaddr, &lsa, local_socklen); |
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331 } |
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332 |
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333 c->local_sockaddr = local_sockaddr; |
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334 c->local_socklen = local_socklen; |
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335 |
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336 c->buffer = ngx_create_temp_buf(c->pool, n); |
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337 if (c->buffer == NULL) { |
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338 ngx_close_accepted_udp_connection(c); |
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339 return; |
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340 } |
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341 |
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342 c->buffer->last = ngx_cpymem(c->buffer->last, buffer, n); |
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343 |
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344 rev = c->read; |
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345 wev = c->write; |
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346 |
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347 wev->ready = 1; |
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348 |
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349 rev->log = log; |
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350 wev->log = log; |
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351 |
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352 /* |
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353 * TODO: MT: - ngx_atomic_fetch_add() |
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354 * or protection by critical section or light mutex |
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355 * |
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356 * TODO: MP: - allocated in a shared memory |
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357 * - ngx_atomic_fetch_add() |
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358 * or protection by critical section or light mutex |
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359 */ |
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360 |
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361 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1); |
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362 |
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363 #if (NGX_STAT_STUB) |
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364 (void) ngx_atomic_fetch_add(ngx_stat_handled, 1); |
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365 #endif |
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366 |
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367 if (ls->addr_ntop) { |
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368 c->addr_text.data = ngx_pnalloc(c->pool, ls->addr_text_max_len); |
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369 if (c->addr_text.data == NULL) { |
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370 ngx_close_accepted_udp_connection(c); |
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371 return; |
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372 } |
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373 |
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374 c->addr_text.len = ngx_sock_ntop(c->sockaddr, c->socklen, |
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375 c->addr_text.data, |
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376 ls->addr_text_max_len, 0); |
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377 if (c->addr_text.len == 0) { |
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378 ngx_close_accepted_udp_connection(c); |
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379 return; |
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380 } |
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381 } |
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382 |
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383 #if (NGX_DEBUG) |
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384 { |
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385 ngx_str_t addr; |
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386 u_char text[NGX_SOCKADDR_STRLEN]; |
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387 |
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388 ngx_debug_accepted_connection(ecf, c); |
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389 |
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390 if (log->log_level & NGX_LOG_DEBUG_EVENT) { |
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391 addr.data = text; |
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392 addr.len = ngx_sock_ntop(c->sockaddr, c->socklen, text, |
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393 NGX_SOCKADDR_STRLEN, 1); |
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394 |
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395 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, log, 0, |
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396 "*%uA recvmsg: %V fd:%d n:%z", |
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397 c->number, &addr, c->fd, n); |
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398 } |
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399 |
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400 } |
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401 #endif |
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402 |
7286 | 403 if (ngx_insert_udp_connection(c) != NGX_OK) { |
404 ngx_close_accepted_udp_connection(c); | |
405 return; | |
406 } | |
407 | |
7285
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408 log->data = NULL; |
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409 log->handler = NULL; |
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410 |
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411 ls->handler(c); |
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412 |
7286 | 413 next: |
414 | |
7285
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415 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) { |
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416 ev->available -= n; |
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417 } |
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418 |
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419 } while (ev->available); |
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420 } |
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421 |
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422 |
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423 static void |
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424 ngx_close_accepted_udp_connection(ngx_connection_t *c) |
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425 { |
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426 ngx_free_connection(c); |
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427 |
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428 c->fd = (ngx_socket_t) -1; |
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429 |
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430 if (c->pool) { |
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431 ngx_destroy_pool(c->pool); |
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432 } |
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433 |
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434 #if (NGX_STAT_STUB) |
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435 (void) ngx_atomic_fetch_add(ngx_stat_active, -1); |
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436 #endif |
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437 } |
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438 |
7286 | 439 |
440 static ssize_t | |
441 ngx_udp_shared_recv(ngx_connection_t *c, u_char *buf, size_t size) | |
442 { | |
443 ssize_t n; | |
444 ngx_buf_t *b; | |
445 | |
446 if (c->udp == NULL || c->udp->buffer == NULL) { | |
447 return NGX_AGAIN; | |
448 } | |
449 | |
450 b = c->udp->buffer; | |
451 | |
452 n = ngx_min(b->last - b->pos, (ssize_t) size); | |
453 | |
454 ngx_memcpy(buf, b->pos, n); | |
455 | |
456 c->udp->buffer = NULL; | |
457 c->read->ready = 0; | |
458 | |
459 return n; | |
460 } | |
461 | |
462 | |
463 void | |
464 ngx_udp_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
465 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) | |
466 { | |
467 ngx_int_t rc; | |
468 ngx_connection_t *c, *ct; | |
469 ngx_rbtree_node_t **p; | |
470 ngx_udp_connection_t *udp, *udpt; | |
471 | |
472 for ( ;; ) { | |
473 | |
474 if (node->key < temp->key) { | |
475 | |
476 p = &temp->left; | |
477 | |
478 } else if (node->key > temp->key) { | |
479 | |
480 p = &temp->right; | |
481 | |
482 } else { /* node->key == temp->key */ | |
483 | |
484 udp = (ngx_udp_connection_t *) node; | |
485 c = udp->connection; | |
486 | |
487 udpt = (ngx_udp_connection_t *) temp; | |
488 ct = udpt->connection; | |
489 | |
490 rc = ngx_cmp_sockaddr(c->sockaddr, c->socklen, | |
491 ct->sockaddr, ct->socklen, 1); | |
492 | |
493 if (rc == 0 && c->listening->wildcard) { | |
494 rc = ngx_cmp_sockaddr(c->local_sockaddr, c->local_socklen, | |
495 ct->local_sockaddr, ct->local_socklen, 1); | |
496 } | |
497 | |
498 p = (rc < 0) ? &temp->left : &temp->right; | |
499 } | |
500 | |
501 if (*p == sentinel) { | |
502 break; | |
503 } | |
504 | |
505 temp = *p; | |
506 } | |
507 | |
508 *p = node; | |
509 node->parent = temp; | |
510 node->left = sentinel; | |
511 node->right = sentinel; | |
512 ngx_rbt_red(node); | |
513 } | |
514 | |
515 | |
516 static ngx_int_t | |
517 ngx_insert_udp_connection(ngx_connection_t *c) | |
518 { | |
519 uint32_t hash; | |
520 ngx_pool_cleanup_t *cln; | |
521 ngx_udp_connection_t *udp; | |
522 | |
523 if (c->udp) { | |
524 return NGX_OK; | |
525 } | |
526 | |
527 udp = ngx_pcalloc(c->pool, sizeof(ngx_udp_connection_t)); | |
528 if (udp == NULL) { | |
529 return NGX_ERROR; | |
530 } | |
531 | |
532 udp->connection = c; | |
533 | |
534 ngx_crc32_init(hash); | |
535 ngx_crc32_update(&hash, (u_char *) c->sockaddr, c->socklen); | |
536 | |
537 if (c->listening->wildcard) { | |
538 ngx_crc32_update(&hash, (u_char *) c->local_sockaddr, c->local_socklen); | |
539 } | |
540 | |
541 ngx_crc32_final(hash); | |
542 | |
543 udp->node.key = hash; | |
544 | |
545 cln = ngx_pool_cleanup_add(c->pool, 0); | |
546 if (cln == NULL) { | |
547 return NGX_ERROR; | |
548 } | |
549 | |
550 cln->data = c; | |
551 cln->handler = ngx_delete_udp_connection; | |
552 | |
553 ngx_rbtree_insert(&c->listening->rbtree, &udp->node); | |
554 | |
555 c->udp = udp; | |
556 | |
557 return NGX_OK; | |
558 } | |
559 | |
560 | |
561 static void | |
562 ngx_delete_udp_connection(void *data) | |
563 { | |
564 ngx_connection_t *c = data; | |
565 | |
566 ngx_rbtree_delete(&c->listening->rbtree, &c->udp->node); | |
7391
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567 |
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568 c->udp = NULL; |
7286 | 569 } |
570 | |
571 | |
572 static ngx_connection_t * | |
573 ngx_lookup_udp_connection(ngx_listening_t *ls, struct sockaddr *sockaddr, | |
574 socklen_t socklen, struct sockaddr *local_sockaddr, socklen_t local_socklen) | |
575 { | |
576 uint32_t hash; | |
577 ngx_int_t rc; | |
578 ngx_connection_t *c; | |
579 ngx_rbtree_node_t *node, *sentinel; | |
580 ngx_udp_connection_t *udp; | |
581 | |
582 #if (NGX_HAVE_UNIX_DOMAIN) | |
583 | |
584 if (sockaddr->sa_family == AF_UNIX) { | |
585 struct sockaddr_un *saun = (struct sockaddr_un *) sockaddr; | |
586 | |
587 if (socklen <= (socklen_t) offsetof(struct sockaddr_un, sun_path) | |
588 || saun->sun_path[0] == '\0') | |
589 { | |
590 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, ngx_cycle->log, 0, | |
591 "unbound unix socket"); | |
592 return NULL; | |
593 } | |
594 } | |
595 | |
7285
88a624c9b491
Events: moved ngx_recvmsg() to new file src/event/ngx_event_udp.c.
Roman Arutyunyan <arut@nginx.com>
parents:
diff
changeset
|
596 #endif |
7286 | 597 |
598 node = ls->rbtree.root; | |
599 sentinel = ls->rbtree.sentinel; | |
600 | |
601 ngx_crc32_init(hash); | |
602 ngx_crc32_update(&hash, (u_char *) sockaddr, socklen); | |
603 | |
604 if (ls->wildcard) { | |
605 ngx_crc32_update(&hash, (u_char *) local_sockaddr, local_socklen); | |
606 } | |
607 | |
608 ngx_crc32_final(hash); | |
609 | |
610 while (node != sentinel) { | |
611 | |
612 if (hash < node->key) { | |
613 node = node->left; | |
614 continue; | |
615 } | |
616 | |
617 if (hash > node->key) { | |
618 node = node->right; | |
619 continue; | |
620 } | |
621 | |
622 /* hash == node->key */ | |
623 | |
624 udp = (ngx_udp_connection_t *) node; | |
625 | |
626 c = udp->connection; | |
627 | |
628 rc = ngx_cmp_sockaddr(sockaddr, socklen, | |
629 c->sockaddr, c->socklen, 1); | |
630 | |
631 if (rc == 0 && ls->wildcard) { | |
632 rc = ngx_cmp_sockaddr(local_sockaddr, local_socklen, | |
633 c->local_sockaddr, c->local_socklen, 1); | |
634 } | |
635 | |
636 if (rc == 0) { | |
637 return c; | |
638 } | |
639 | |
640 node = (rc < 0) ? node->left : node->right; | |
641 } | |
642 | |
643 return NULL; | |
644 } | |
645 | |
646 #endif |