1
2 /*
3 * Copyright (C) Igor Sysoev
4 */
5
6
7 #include <ngx_config.h>
8 #include <ngx_core.h>
9 #include <ngx_event.h>
10 #include <ngx_event_connect.h>
11
12
13 ngx_int_t
14 ngx_event_connect_peer(ngx_peer_connection_t *pc)
15 {
16 int rc;
17 ngx_int_t event;
18 ngx_err_t err;
19 ngx_uint_t level;
20 ngx_socket_t s;
21 ngx_event_t *rev, *wev;
22 ngx_connection_t *c;
23
24 rc = pc->get(pc, pc->data);
25 if (rc != NGX_OK) {
26 return rc;
27 }
28
29 s = ngx_socket(pc->sockaddr->sa_family, SOCK_STREAM, 0);
30
31 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, pc->log, 0, "socket %d", s);
32
33 if (s == -1) {
34 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
35 ngx_socket_n " failed");
36 return NGX_ERROR;
37 }
38
39
40 c = ngx_get_connection(s, pc->log);
41
42 if (c == NULL) {
43 if (ngx_close_socket(s) == -1) {
44 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
45 ngx_close_socket_n "failed");
46 }
47
48 return NGX_ERROR;
49 }
50
51 if (pc->rcvbuf) {
52 if (setsockopt(s, SOL_SOCKET, SO_RCVBUF,
53 (const void *) &pc->rcvbuf, sizeof(int)) == -1)
54 {
55 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
56 "setsockopt(SO_RCVBUF) failed");
57
58 ngx_free_connection(c);
59
60 if (ngx_close_socket(s) == -1) {
61 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
62 ngx_close_socket_n " failed");
63 }
64
65 return NGX_ERROR;
66 }
67 }
68
69 if (ngx_nonblocking(s) == -1) {
70 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
71 ngx_nonblocking_n " failed");
72
73 ngx_free_connection(c);
74
75 if (ngx_close_socket(s) == -1) {
76 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
77 ngx_close_socket_n " failed");
78 }
79
80 return NGX_ERROR;
81 }
82
83 c->recv = ngx_recv;
84 c->send = ngx_send;
85 c->recv_chain = ngx_recv_chain;
86 c->send_chain = ngx_send_chain;
87
88 c->sendfile = 1;
89
90 c->log_error = pc->log_error;
91
92 if (pc->sockaddr->sa_family != AF_INET) {
93 c->tcp_nopush = NGX_TCP_NOPUSH_DISABLED;
94 c->tcp_nodelay = NGX_TCP_NODELAY_DISABLED;
95
96 #if (NGX_SOLARIS)
97 /* Solaris's sendfilev() supports AF_NCA, AF_INET, and AF_INET6 */
98 c->sendfile = 0;
99 #endif
100 }
101
102 rev = c->read;
103 wev = c->write;
104
105 rev->log = pc->log;
106 wev->log = pc->log;
107
108 pc->connection = c;
109
110 /*
111 * TODO: MT: - ngx_atomic_fetch_add()
112 * or protection by critical section or mutex
113 *
114 * TODO: MP: - allocated in a shared memory
115 * - ngx_atomic_fetch_add()
116 * or protection by critical section or mutex
117 */
118
119 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1);
120
121 #if (NGX_THREADS)
122 rev->lock = pc->lock;
123 wev->lock = pc->lock;
124 rev->own_lock = &c->lock;
125 wev->own_lock = &c->lock;
126 #endif
127
128 if (ngx_add_conn) {
129 if (ngx_add_conn(c) == NGX_ERROR) {
130 return NGX_ERROR;
131 }
132 }
133
134 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, pc->log, 0,
135 "connect to %V, fd:%d #%d", pc->name, s, c->number);
136
137 rc = connect(s, pc->sockaddr, pc->socklen);
138
139 if (rc == -1) {
140 err = ngx_socket_errno;
141
142
143 if (err != NGX_EINPROGRESS
144 #if (NGX_WIN32)
145 /* Winsock returns WSAEWOULDBLOCK (NGX_EAGAIN) */
146 && err != NGX_EAGAIN
147 #endif
148 )
149 {
150 if (err == NGX_ECONNREFUSED
151 #if (NGX_LINUX)
152 /*
153 * Linux returns EAGAIN instead of ECONNREFUSED
154 * for unix sockets if listen queue is full
155 */
156 || err == NGX_EAGAIN
157 #endif
158 || err == NGX_ECONNRESET
159 || err == NGX_ENETDOWN
160 || err == NGX_ENETUNREACH
161 || err == NGX_EHOSTDOWN
162 || err == NGX_EHOSTUNREACH)
163 {
164 level = NGX_LOG_ERR;
165
166 } else {
167 level = NGX_LOG_CRIT;
168 }
169
170 ngx_log_error(level, c->log, err, "connect() to %V failed",
171 pc->name);
172
173 return NGX_DECLINED;
174 }
175 }
176
177 if (ngx_add_conn) {
178 if (rc == -1) {
179
180 /* NGX_EINPROGRESS */
181
182 return NGX_AGAIN;
183 }
184
185 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, pc->log, 0, "connected");
186
187 wev->ready = 1;
188
189 return NGX_OK;
190 }
191
192 if (ngx_event_flags & NGX_USE_AIO_EVENT) {
193
194 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, pc->log, ngx_socket_errno,
195 "connect(): %d", rc);
196
197 /* aio, iocp */
198
199 if (ngx_blocking(s) == -1) {
200 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
201 ngx_blocking_n " failed");
202 return NGX_ERROR;
203 }
204
205 /*
206 * FreeBSD's aio allows to post an operation on non-connected socket.
207 * NT does not support it.
208 *
209 * TODO: check in Win32, etc. As workaround we can use NGX_ONESHOT_EVENT
210 */
211
212 rev->ready = 1;
213 wev->ready = 1;
214
215 return NGX_OK;
216 }
217
218 if (ngx_event_flags & NGX_USE_CLEAR_EVENT) {
219
220 /* kqueue */
221
222 event = NGX_CLEAR_EVENT;
223
224 } else {
225
226 /* select, poll, /dev/poll */
227
228 event = NGX_LEVEL_EVENT;
229 }
230
231 if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) {
232 return NGX_ERROR;
233 }
234
235 if (rc == -1) {
236
237 /* NGX_EINPROGRESS */
238
239 if (ngx_add_event(wev, NGX_WRITE_EVENT, event) != NGX_OK) {
240 return NGX_ERROR;
241 }
242
243 return NGX_AGAIN;
244 }
245
246 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, pc->log, 0, "connected");
247
248 wev->ready = 1;
249
250 return NGX_OK;
251 }
252
253
254 ngx_int_t
255 ngx_event_get_peer(ngx_peer_connection_t *pc, void *data)
256 {
257 return NGX_OK;
258 }
259
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