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0
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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 #include <nginx.h>
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11
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12
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13 typedef struct {
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10
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14 int flag;
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15 ngx_str_t *name;
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0
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16 } ngx_accept_log_ctx_t;
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17
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18
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19 static void ngx_close_accepted_socket(ngx_socket_t s, ngx_log_t *log);
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10
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20 static u_char *ngx_accept_log_error(void *data, u_char *buf, size_t len);
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0
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21
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22
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23 void ngx_event_accept(ngx_event_t *ev)
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24 {
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25 ngx_uint_t instance, accepted;
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26 socklen_t len;
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27 struct sockaddr *sa;
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28 ngx_err_t err;
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29 ngx_log_t *log;
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30 ngx_pool_t *pool;
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31 ngx_socket_t s;
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32 ngx_event_t *rev, *wev;
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33 ngx_connection_t *c, *ls;
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34 ngx_event_conf_t *ecf;
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35 ngx_accept_log_ctx_t *ctx;
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36
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37 ecf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_event_core_module);
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38
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39 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
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40 ev->available = 1;
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41
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4
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42 } else if (!(ngx_event_flags & NGX_USE_KQUEUE_EVENT)) {
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0
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43 ev->available = ecf->multi_accept;
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44 }
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45
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46 ls = ev->data;
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47
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48 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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10
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49 "accept on %V, ready: %d",
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50 &ls->listening->addr_text, ev->available);
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0
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51
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52 ev->ready = 0;
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53 accepted = 0;
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54 pool = NULL;
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55
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56 do {
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57
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58 if (pool == NULL) {
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59
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60 /*
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61 * Create the pool before accept() to avoid the copying of
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62 * the sockaddr. Although accept() can fail it is uncommon
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63 * case and besides the pool can be got from the free pool list
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64 */
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65
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66 if (!(pool = ngx_create_pool(ls->listening->pool_size, ev->log))) {
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67 return;
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68 }
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69 }
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70
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71 if (!(sa = ngx_palloc(pool, ls->listening->socklen))) {
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72 ngx_destroy_pool(pool);
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73 return;
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74 }
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75
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76 if (!(log = ngx_palloc(pool, sizeof(ngx_log_t)))) {
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77 ngx_destroy_pool(pool);
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78 return;
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79 }
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80
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81 ngx_memcpy(log, ls->log, sizeof(ngx_log_t));
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82 pool->log = log;
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83
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84 if (!(ctx = ngx_palloc(pool, sizeof(ngx_accept_log_ctx_t)))) {
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85 ngx_destroy_pool(pool);
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86 return;
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87 }
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88
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89 /* -1 disables the connection number logging */
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90 ctx->flag = -1;
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10
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91 ctx->name = &ls->listening->addr_text;
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0
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92
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93 log->data = ctx;
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94 log->handler = ngx_accept_log_error;
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95
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96 len = ls->listening->socklen;
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97
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98 s = accept(ls->fd, sa, &len);
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99 if (s == -1) {
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100 err = ngx_socket_errno;
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101
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102 if (err == NGX_EAGAIN) {
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103 #if 0
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104 if (!(ngx_event_flags & NGX_USE_RTSIG_EVENT))
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105 {
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106 ngx_log_error(NGX_LOG_NOTICE, log, err,
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107 "EAGAIN after %d accepted connection(s)",
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108 accepted);
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109 }
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110 #endif
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111
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112 ngx_destroy_pool(pool);
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113 return;
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114 }
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115
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116 ngx_log_error(NGX_LOG_ALERT, ev->log, err,
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10
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117 "accept() on %V failed", &ls->listening->addr_text);
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0
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118
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119 if (err == NGX_ECONNABORTED) {
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4
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120 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
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0
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121 ev->available--;
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122 }
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123
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124 if (ev->available) {
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125 /* reuse the previously allocated pool */
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126 continue;
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127 }
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128 }
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129
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130 ngx_destroy_pool(pool);
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131 return;
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132 }
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133
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134 #if (NGX_STAT_STUB)
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135 (*ngx_stat_accepted)++;
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136 #endif
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137
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138 ngx_accept_disabled = (ngx_uint_t) s + NGX_ACCEPT_THRESHOLD
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139 - ecf->connections;
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140
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141 /* disable warning: Win32 SOCKET is u_int while UNIX socket is int */
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142
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143 if ((ngx_uint_t) s >= ecf->connections) {
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144
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145 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
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10
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146 "accept() on %V returned socket #%d while "
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0
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147 "only %d connections was configured, "
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148 "closing the connection",
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10
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149 &ls->listening->addr_text, s, ecf->connections);
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0
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150
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151 ngx_close_accepted_socket(s, log);
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152 ngx_destroy_pool(pool);
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153 return;
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154 }
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155
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156 #if (NGX_STAT_STUB)
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157 (*ngx_stat_active)++;
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158 #endif
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159
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160 /* set a blocking mode for aio and non-blocking mode for the others */
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161
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162 if (ngx_inherited_nonblocking) {
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163 if ((ngx_event_flags & NGX_USE_AIO_EVENT)) {
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164 if (ngx_blocking(s) == -1) {
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165 ngx_log_error(NGX_LOG_ALERT, log, ngx_socket_errno,
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166 ngx_blocking_n " failed");
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167
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168 ngx_close_accepted_socket(s, log);
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169 ngx_destroy_pool(pool);
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170 return;
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171 }
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172 }
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173
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174 } else {
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175 if (!(ngx_event_flags & (NGX_USE_AIO_EVENT|NGX_USE_RTSIG_EVENT))) {
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176 if (ngx_nonblocking(s) == -1) {
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177 ngx_log_error(NGX_LOG_ALERT, log, ngx_socket_errno,
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178 ngx_nonblocking_n " failed");
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179
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180 ngx_close_accepted_socket(s, log);
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181 ngx_destroy_pool(pool);
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182 return;
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183 }
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184 }
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185 }
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186
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10
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187 #if (NGX_WIN32)
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0
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188 /*
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189 * Winsock assignes a socket number divisible by 4
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190 * so to find a connection we divide a socket number by 4.
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191 */
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192
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193 if (s % 4) {
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194 ngx_log_error(NGX_LOG_EMERG, ev->log, 0,
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10
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195 "accept() on %V returned socket #%d, "
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0
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196 "not divisible by 4",
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10
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197 &ls->listening->addr_text, s);
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0
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198 exit(1);
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199 }
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200
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201 c = &ngx_cycle->connections[s / 4];
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202 rev = &ngx_cycle->read_events[s / 4];
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203 wev = &ngx_cycle->write_events[s / 4];
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204 #else
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205 c = &ngx_cycle->connections[s];
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206 rev = &ngx_cycle->read_events[s];
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207 wev = &ngx_cycle->write_events[s];
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208 #endif
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209
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210 instance = rev->instance;
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211
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212 #if (NGX_THREADS)
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213
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214 if (*(&c->lock)) {
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215 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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216 "spinlock in accept, fd:%", s);
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217 ngx_spinlock(&c->lock, 1000);
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218 ngx_unlock(&c->lock);
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219 }
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220
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221 #endif
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222
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223 ngx_memzero(rev, sizeof(ngx_event_t));
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224 ngx_memzero(wev, sizeof(ngx_event_t));
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225 ngx_memzero(c, sizeof(ngx_connection_t));
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226
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227 c->pool = pool;
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228
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229 c->listening = ls->listening;
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230 c->sockaddr = sa;
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231 c->socklen = len;
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232
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233 rev->instance = !instance;
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234 wev->instance = !instance;
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235
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236 rev->index = NGX_INVALID_INDEX;
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237 wev->index = NGX_INVALID_INDEX;
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238
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239 rev->data = c;
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240 wev->data = c;
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241
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242 c->read = rev;
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243 c->write = wev;
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244
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245 c->fd = s;
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246 c->unexpected_eof = 1;
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247
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248 wev->write = 1;
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249 wev->ready = 1;
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250
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251 if (ngx_event_flags & (NGX_USE_AIO_EVENT|NGX_USE_RTSIG_EVENT)) {
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252 /* epoll, rtsig, aio, iocp */
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253 rev->ready = 1;
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254 }
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255
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256 if (ev->deferred_accept) {
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257 rev->ready = 1;
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258 }
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259
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260 c->ctx = ls->ctx;
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261 c->servers = ls->servers;
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262
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263 c->recv = ngx_recv;
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264 c->send_chain = ngx_send_chain;
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265
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266 c->log = log;
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267 rev->log = log;
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268 wev->log = log;
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269
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270 /*
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271 * TODO: MT: - atomic increment (x86: lock xadd)
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272 * or protection by critical section or light mutex
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273 *
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274 * TODO: MP: - allocated in a shared memory
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275 * - atomic increment (x86: lock xadd)
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276 * or protection by critical section or light mutex
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277 */
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278
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279 c->number = ngx_atomic_inc(ngx_connection_counter);
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280
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281 #if (NGX_THREADS)
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282 rev->lock = &c->lock;
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283 wev->lock = &c->lock;
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284 rev->own_lock = &c->lock;
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285 wev->own_lock = &c->lock;
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286 #endif
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287
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288 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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289 "accept: fd:%d c:%d", s, c->number);
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290
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291 if (c->listening->addr_ntop) {
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292 c->addr_text.data = ngx_palloc(c->pool,
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293 c->listening->addr_text_max_len);
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294 if (c->addr_text.data == NULL) {
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295 ngx_close_accepted_socket(s, log);
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296 ngx_destroy_pool(pool);
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297 return;
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298 }
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299
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300 c->addr_text.len = ngx_sock_ntop(c->listening->family, c->sockaddr,
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301 c->addr_text.data,
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302 c->listening->addr_text_max_len);
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303 if (c->addr_text.len == 0) {
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304 ngx_close_accepted_socket(s, log);
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305 ngx_destroy_pool(pool);
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306 return;
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307 }
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308 }
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309
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310 #if (NGX_DEBUG)
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311 {
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312
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313 uint32_t *addr;
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314 in_addr_t i;
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315 struct sockaddr_in *addr_in;
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316
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317 addr_in = (struct sockaddr_in *) sa;
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318 addr = ecf->debug_connection.elts;
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319 for (i = 0; i < ecf->debug_connection.nelts; i++) {
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320 if (addr[i] == addr_in->sin_addr.s_addr) {
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321 log->log_level = NGX_LOG_DEBUG_CONNECTION|NGX_LOG_DEBUG_ALL;
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322 break;
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323 }
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324 }
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325
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326 }
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327 #endif
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328
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329 if (ngx_add_conn && (ngx_event_flags & NGX_USE_EPOLL_EVENT) == 0) {
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330 if (ngx_add_conn(c) == NGX_ERROR) {
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331 ngx_close_accepted_socket(s, log);
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332 ngx_destroy_pool(pool);
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333 return;
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334 }
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335 }
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336
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337 pool = NULL;
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338
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339 log->data = NULL;
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340 log->handler = NULL;
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341
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342 ls->listening->handler(c);
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343
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4
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344 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
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0
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345 ev->available--;
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346 }
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347
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348 accepted++;
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349
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350 } while (ev->available);
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351 }
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352
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353
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354 ngx_int_t ngx_trylock_accept_mutex(ngx_cycle_t *cycle)
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355 {
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356 if (*ngx_accept_mutex == 0
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357 && ngx_atomic_cmp_set(ngx_accept_mutex, 0, ngx_pid))
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358 {
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359 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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360 "accept mutex locked");
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361
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362 if (!ngx_accept_mutex_held) {
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363 if (ngx_enable_accept_events(cycle) == NGX_ERROR) {
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364 *ngx_accept_mutex = 0;
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365 return NGX_ERROR;
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366 }
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367
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368 ngx_accept_mutex_held = 1;
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369 }
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370
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371 return NGX_OK;
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372 }
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373
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374 if (ngx_accept_mutex_held) {
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375 if (ngx_disable_accept_events(cycle) == NGX_ERROR) {
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376 return NGX_ERROR;
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377 }
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378
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379 ngx_accept_mutex_held = 0;
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380 }
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381
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382 return NGX_OK;
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383 }
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384
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385
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386 ngx_int_t ngx_enable_accept_events(ngx_cycle_t *cycle)
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387 {
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388 ngx_uint_t i;
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389 ngx_listening_t *s;
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390
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391 s = cycle->listening.elts;
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392 for (i = 0; i < cycle->listening.nelts; i++) {
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393
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394 /*
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395 * we do not need to handle the Winsock sockets here (divide a socket
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396 * number by 4) because this function would never called
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397 * in the Winsock environment
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398 */
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399
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400 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
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401 if (ngx_add_conn(&cycle->connections[s[i].fd]) == NGX_ERROR) {
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402 return NGX_ERROR;
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403 }
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404
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405 } else {
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406 if (ngx_add_event(&cycle->read_events[s[i].fd], NGX_READ_EVENT, 0)
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407 == NGX_ERROR)
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408 {
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409 return NGX_ERROR;
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410 }
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411 }
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412 }
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413
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414 return NGX_OK;
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415 }
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416
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417
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418 ngx_int_t ngx_disable_accept_events(ngx_cycle_t *cycle)
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419 {
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420 ngx_uint_t i;
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421 ngx_listening_t *s;
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422
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423 s = cycle->listening.elts;
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|
|
424 for (i = 0; i < cycle->listening.nelts; i++) {
|
|
|
425
|
|
|
426 /*
|
|
|
427 * we do not need to handle the Winsock sockets here (divide a socket
|
|
|
428 * number by 4) because this function would never called
|
|
|
429 * in the Winsock environment
|
|
|
430 */
|
|
|
431
|
|
|
432 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
|
|
|
433 if (!cycle->connections[s[i].fd].read->active) {
|
|
|
434 continue;
|
|
|
435 }
|
|
|
436
|
|
|
437 if (ngx_del_conn(&cycle->connections[s[i].fd], NGX_DISABLE_EVENT)
|
|
|
438 == NGX_ERROR)
|
|
|
439 {
|
|
|
440 return NGX_ERROR;
|
|
|
441 }
|
|
|
442
|
|
|
443 } else {
|
|
|
444 if (!cycle->read_events[s[i].fd].active) {
|
|
|
445 continue;
|
|
|
446 }
|
|
|
447
|
|
|
448 if (ngx_del_event(&cycle->read_events[s[i].fd], NGX_READ_EVENT,
|
|
|
449 NGX_DISABLE_EVENT) == NGX_ERROR)
|
|
|
450 {
|
|
|
451 return NGX_ERROR;
|
|
|
452 }
|
|
|
453 }
|
|
|
454 }
|
|
|
455
|
|
|
456 return NGX_OK;
|
|
|
457 }
|
|
|
458
|
|
|
459
|
|
|
460 static void ngx_close_accepted_socket(ngx_socket_t s, ngx_log_t *log)
|
|
|
461 {
|
|
|
462 if (ngx_close_socket(s) == -1) {
|
|
|
463 ngx_log_error(NGX_LOG_ALERT, log, ngx_socket_errno,
|
|
|
464 ngx_close_socket_n " failed");
|
|
|
465 }
|
|
|
466 }
|
|
|
467
|
|
|
468
|
|
10
|
469 static u_char *ngx_accept_log_error(void *data, u_char *buf, size_t len)
|
|
0
|
470 {
|
|
|
471 ngx_accept_log_ctx_t *ctx = data;
|
|
|
472
|
|
10
|
473 return ngx_snprintf(buf, len, " while accept() on %V", ctx->name);
|
|
0
|
474 }
|
