1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
|
diff --git a/auto/unix b/auto/unix
index 10835f6c..b5b33bb3 100644
--- a/auto/unix
+++ b/auto/unix
@@ -990,3 +990,27 @@ ngx_feature_test='struct addrinfo *res;
if (getaddrinfo("localhost", NULL, NULL, &res) != 0) return 1;
freeaddrinfo(res)'
. auto/feature
+
+ngx_feature="SOCK_CLOEXEC support"
+ngx_feature_name="NGX_HAVE_SOCKET_CLOEXEC"
+ngx_feature_run=no
+ngx_feature_incs="#include <sys/types.h>
+ #include <sys/socket.h>"
+ngx_feature_path=
+ngx_feature_libs=
+ngx_feature_test="int fd;
+ fd = socket(AF_INET, SOCK_STREAM | SOCK_CLOEXEC, 0);"
+. auto/feature
+
+ngx_feature="FD_CLOEXEC support"
+ngx_feature_name="NGX_HAVE_FD_CLOEXEC"
+ngx_feature_run=no
+ngx_feature_incs="#include <sys/types.h>
+ #include <sys/socket.h>
+ #include <fcntl.h>"
+ngx_feature_path=
+ngx_feature_libs=
+ngx_feature_test="int fd;
+ fd = socket(AF_INET, SOCK_STREAM, 0);
+ fcntl(fd, F_SETFD, FD_CLOEXEC);"
+. auto/feature
diff --git a/src/core/ngx_resolver.c b/src/core/ngx_resolver.c
index cd55520c..438e0806 100644
--- a/src/core/ngx_resolver.c
+++ b/src/core/ngx_resolver.c
@@ -4466,8 +4466,14 @@ ngx_tcp_connect(ngx_resolver_connection_t *rec)
ngx_event_t *rev, *wev;
ngx_connection_t *c;
+#if (NGX_HAVE_SOCKET_CLOEXEC)
+ s = ngx_socket(rec->sockaddr->sa_family, SOCK_STREAM | SOCK_CLOEXEC, 0);
+
+#else
s = ngx_socket(rec->sockaddr->sa_family, SOCK_STREAM, 0);
+#endif
+
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, &rec->log, 0, "TCP socket %d", s);
if (s == (ngx_socket_t) -1) {
@@ -4494,6 +4500,15 @@ ngx_tcp_connect(ngx_resolver_connection_t *rec)
goto failed;
}
+#if (NGX_HAVE_FD_CLOEXEC)
+ if (ngx_cloexec(s) == -1) {
+ ngx_log_error(NGX_LOG_ALERT, &rec->log, ngx_socket_errno,
+ ngx_cloexec_n " failed");
+
+ goto failed;
+ }
+#endif
+
rev = c->read;
wev = c->write;
diff --git a/src/event/ngx_event.h b/src/event/ngx_event.h
index 19fec68..8c2f01a 100644
--- a/src/event/ngx_event.h
+++ b/src/event/ngx_event.h
@@ -73,6 +73,9 @@ struct ngx_event_s {
/* to test on worker exit */
unsigned channel:1;
unsigned resolver:1;
+#if (HAVE_SOCKET_CLOEXEC_PATCH)
+ unsigned skip_socket_leak_check:1;
+#endif
unsigned cancelable:1;
diff --git a/src/event/ngx_event_accept.c b/src/event/ngx_event_accept.c
index 77563709..5827b9d0 100644
--- a/src/event/ngx_event_accept.c
+++ b/src/event/ngx_event_accept.c
@@ -62,7 +62,9 @@ ngx_event_accept(ngx_event_t *ev)
#if (NGX_HAVE_ACCEPT4)
if (use_accept4) {
- s = accept4(lc->fd, &sa.sockaddr, &socklen, SOCK_NONBLOCK);
+ s = accept4(lc->fd, &sa.sockaddr, &socklen,
+ SOCK_NONBLOCK | SOCK_CLOEXEC);
+
} else {
s = accept(lc->fd, &sa.sockaddr, &socklen);
}
@@ -202,6 +204,16 @@ ngx_event_accept(ngx_event_t *ev)
ngx_close_accepted_connection(c);
return;
}
+
+#if (NGX_HAVE_FD_CLOEXEC)
+ if (ngx_cloexec(s) == -1) {
+ ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno,
+ ngx_cloexec_n " failed");
+ ngx_close_accepted_connection(c);
+ return;
+ }
+#endif
+
}
}
diff --git a/src/event/ngx_event_connect.c b/src/event/ngx_event_connect.c
index c5bb8068..cf33b1d2 100644
--- a/src/event/ngx_event_connect.c
+++ b/src/event/ngx_event_connect.c
@@ -38,8 +38,15 @@ ngx_event_connect_peer(ngx_peer_connection_t *pc)
type = (pc->type ? pc->type : SOCK_STREAM);
+#if (NGX_HAVE_SOCKET_CLOEXEC)
+ s = ngx_socket(pc->sockaddr->sa_family, type | SOCK_CLOEXEC, 0);
+
+#else
s = ngx_socket(pc->sockaddr->sa_family, type, 0);
+#endif
+
+
ngx_log_debug2(NGX_LOG_DEBUG_EVENT, pc->log, 0, "%s socket %d",
(type == SOCK_STREAM) ? "stream" : "dgram", s);
@@ -80,6 +87,15 @@ ngx_event_connect_peer(ngx_peer_connection_t *pc)
goto failed;
}
+#if (NGX_HAVE_FD_CLOEXEC)
+ if (ngx_cloexec(s) == -1) {
+ ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
+ ngx_cloexec_n " failed");
+
+ goto failed;
+ }
+#endif
+
if (pc->local) {
#if (NGX_HAVE_TRANSPARENT_PROXY)
diff --git a/src/os/unix/ngx_process_cycle.c b/src/os/unix/ngx_process_cycle.c
index c4376a5..48e8fa8 100644
--- a/src/os/unix/ngx_process_cycle.c
+++ b/src/os/unix/ngx_process_cycle.c
@@ -1032,6 +1032,9 @@ ngx_worker_process_exit(ngx_cycle_t *cycle)
for (i = 0; i < cycle->connection_n; i++) {
if (c[i].fd != -1
&& c[i].read
+#if (HAVE_SOCKET_CLOEXEC_PATCH)
+ && !c[i].read->skip_socket_leak_check
+#endif
&& !c[i].read->accept
&& !c[i].read->channel
&& !c[i].read->resolver)
diff --git a/src/os/unix/ngx_socket.h b/src/os/unix/ngx_socket.h
index fcc51533..d1eebf47 100644
--- a/src/os/unix/ngx_socket.h
+++ b/src/os/unix/ngx_socket.h
@@ -38,6 +38,17 @@ int ngx_blocking(ngx_socket_t s);
#endif
+#if (NGX_HAVE_FD_CLOEXEC)
+
+#define ngx_cloexec(s) fcntl(s, F_SETFD, FD_CLOEXEC)
+#define ngx_cloexec_n "fcntl(FD_CLOEXEC)"
+
+/* at least FD_CLOEXEC is required to ensure connection fd is closed
+ * after execve */
+#define HAVE_SOCKET_CLOEXEC_PATCH 1
+
+#endif
+
int ngx_tcp_nopush(ngx_socket_t s);
int ngx_tcp_push(ngx_socket_t s);
|