1
2 /*
3 * Copyright (C) Igor Sysoev
4 * Copyright (C) NGINX, Inc.
5 */
6
7 #include <nxt_main.h>
8
9
10 static u_char *nxt_listen_socket_log_handler(void *ctx, u_char *pos,
11 u_char *last);
12
13
14 nxt_int_t
nxt_listen_socket(nxt_task_t * task,nxt_socket_t s,int backlog)15 nxt_listen_socket(nxt_task_t *task, nxt_socket_t s, int backlog)
16 {
17 nxt_debug(task, "listen(%d, %d)", s, backlog);
18
19 if (nxt_fast_path(listen(s, backlog) == 0)) {
20 return NXT_OK;
21 }
22
23 nxt_alert(task, "listen(%d, %d) failed %E", s, backlog, nxt_socket_errno);
24
25 return NXT_ERROR;
26 }
27
28
29 nxt_int_t
nxt_listen_socket_create(nxt_task_t * task,nxt_mp_t * mp,nxt_listen_socket_t * ls)30 nxt_listen_socket_create(nxt_task_t *task, nxt_mp_t *mp,
31 nxt_listen_socket_t *ls)
32 {
33 nxt_log_t log, *old;
34 nxt_uint_t family;
35 nxt_socket_t s;
36 nxt_thread_t *thr;
37 nxt_sockaddr_t *sa;
38 #if (NXT_HAVE_UNIX_DOMAIN)
39 int ret;
40 u_char *p;
41 nxt_err_t err;
42 nxt_socket_t ts;
43 nxt_sockaddr_t *orig_sa;
44 nxt_file_name_t *name, *tmp;
45 nxt_file_access_t access;
46 #endif
47
48 sa = ls->sockaddr;
49
50 thr = nxt_thread();
51 old = thr->log;
52 log = *thr->log;
53 log.ctx_handler = nxt_listen_socket_log_handler;
54 log.ctx = sa;
55 thr->log = &log;
56
57 family = sa->u.sockaddr.sa_family;
58
59 s = nxt_socket_create(task, family, sa->type, 0, ls->flags);
60 if (s == -1) {
61 goto fail;
62 }
63
64 if (nxt_socket_setsockopt(task, s, SOL_SOCKET, SO_REUSEADDR, 1) != NXT_OK) {
65 goto fail;
66 }
67
68 #if (NXT_INET6 && defined IPV6_V6ONLY)
69
70 if (family == AF_INET6 && ls->ipv6only) {
71 int ipv6only;
72
73 ipv6only = (ls->ipv6only == 1);
74
75 /* Ignore possible error. TODO: why? */
76 (void) nxt_socket_setsockopt(task, s, IPPROTO_IPV6, IPV6_V6ONLY,
77 ipv6only);
78 }
79
80 #endif
81
82 #if 0
83
84 /* Ignore possible error. TODO: why? */
85 (void) nxt_socket_setsockopt(task, s, SOL_SOCKET, SO_SNDBUF, 8192);
86
87 #endif
88
89 if (ls->read_after_accept) {
90 nxt_socket_defer_accept(task, s, sa);
91 }
92
93 #if (NXT_HAVE_UNIX_DOMAIN)
94
95 if (family == AF_UNIX
96 && sa->type == SOCK_STREAM
97 && sa->u.sockaddr_un.sun_path[0] != '\0')
98 {
99 orig_sa = sa;
100
101 sa = nxt_sockaddr_alloc(mp, sa->socklen + 4, sa->length + 4);
102 if (sa == NULL) {
103 goto fail;
104 }
105
106 sa->type = SOCK_STREAM;
107 sa->u.sockaddr_un.sun_family = AF_UNIX;
108
109 p = nxt_cpystr((u_char *) sa->u.sockaddr_un.sun_path,
110 (u_char *) orig_sa->u.sockaddr_un.sun_path);
111 nxt_memcpy(p, ".tmp", 4);
112
113 nxt_sockaddr_text(sa);
114
115 (void) unlink(sa->u.sockaddr_un.sun_path);
116
117 } else {
118 orig_sa = NULL;
119 }
120
121 #endif
122
123 if (nxt_socket_bind(task, s, sa) != NXT_OK) {
124 goto fail;
125 }
126
127 #if (NXT_HAVE_UNIX_DOMAIN)
128
129 if (family == AF_UNIX) {
130 name = (nxt_file_name_t *) sa->u.sockaddr_un.sun_path;
131
132 access = (S_IRUSR | S_IWUSR);
133
134 if (nxt_file_set_access(name, access) != NXT_OK) {
135 goto listen_fail;
136 }
137 }
138
139 #endif
140
141 nxt_debug(task, "listen(%d, %d)", s, ls->backlog);
142
143 if (listen(s, ls->backlog) != 0) {
144 nxt_alert(task, "listen(%d, %d) failed %E",
145 s, ls->backlog, nxt_socket_errno);
146 goto listen_fail;
147 }
148
149 #if (NXT_HAVE_UNIX_DOMAIN)
150
151 if (orig_sa != NULL) {
152 ts = nxt_socket_create(task, AF_UNIX, SOCK_STREAM, 0, 0);
153 if (ts == -1) {
154 goto listen_fail;
155 }
156
157 ret = connect(ts, &orig_sa->u.sockaddr, orig_sa->socklen);
158
159 err = nxt_socket_errno;
160
161 nxt_socket_close(task, ts);
162
163 if (ret == 0) {
164 nxt_alert(task, "connect(%d, %*s) succeed, address already in use",
165 ts, (size_t) orig_sa->length,
166 nxt_sockaddr_start(orig_sa));
167
168 goto listen_fail;
169 }
170
171 if (err != NXT_ENOENT && err != NXT_ECONNREFUSED) {
172 nxt_alert(task, "connect(%d, %*s) failed %E",
173 ts, (size_t) orig_sa->length,
174 nxt_sockaddr_start(orig_sa), err);
175
176 goto listen_fail;
177 }
178
179 tmp = (nxt_file_name_t *) sa->u.sockaddr_un.sun_path;
180 name = (nxt_file_name_t *) orig_sa->u.sockaddr_un.sun_path;
181
182 if (nxt_file_rename(tmp, name) != NXT_OK) {
183 goto listen_fail;
184 }
185 }
186
187 #endif
188
189 ls->socket = s;
190 thr->log = old;
191
192 return NXT_OK;
193
194 listen_fail:
195
196 #if (NXT_HAVE_UNIX_DOMAIN)
197
198 if (family == AF_UNIX) {
199 name = (nxt_file_name_t *) sa->u.sockaddr_un.sun_path;
200
201 (void) nxt_file_delete(name);
202 }
203
204 #endif
205
206 fail:
207
208 if (s != -1) {
209 nxt_socket_close(task, s);
210 }
211
212 thr->log = old;
213
214 return NXT_ERROR;
215 }
216
217
218 nxt_int_t
nxt_listen_socket_update(nxt_task_t * task,nxt_listen_socket_t * ls,nxt_listen_socket_t * prev)219 nxt_listen_socket_update(nxt_task_t *task, nxt_listen_socket_t *ls,
220 nxt_listen_socket_t *prev)
221 {
222 nxt_log_t log, *old;
223 nxt_thread_t *thr;
224
225 ls->socket = prev->socket;
226
227 thr = nxt_thread();
228 old = thr->log;
229 log = *thr->log;
230 log.ctx_handler = nxt_listen_socket_log_handler;
231 log.ctx = ls->sockaddr;
232 thr->log = &log;
233
234 nxt_debug(task, "listen(%d, %d)", ls->socket, ls->backlog);
235
236 if (listen(ls->socket, ls->backlog) != 0) {
237 nxt_alert(task, "listen(%d, %d) failed %E",
238 ls->socket, ls->backlog, nxt_socket_errno);
239 goto fail;
240 }
241
242 thr->log = old;
243
244 return NXT_OK;
245
246 fail:
247
248 thr->log = old;
249
250 return NXT_ERROR;
251 }
252
253
254 void
nxt_listen_socket_remote_size(nxt_listen_socket_t * ls)255 nxt_listen_socket_remote_size(nxt_listen_socket_t *ls)
256 {
257 switch (ls->sockaddr->u.sockaddr.sa_family) {
258
259 #if (NXT_INET6)
260
261 case AF_INET6:
262 ls->socklen = sizeof(struct sockaddr_in6);
263 ls->address_length = NXT_INET6_ADDR_STR_LEN;
264
265 break;
266
267 #endif
268
269 #if (NXT_HAVE_UNIX_DOMAIN)
270
271 case AF_UNIX:
272 /*
273 * A remote socket is usually unbound and thus has unspecified Unix
274 * domain sockaddr_un which can be shortcut to 3 bytes. To handle
275 * a bound remote socket correctly ls->socklen should be larger, see
276 * comment in nxt_socket.h.
277 */
278 ls->socklen = offsetof(struct sockaddr_un, sun_path) + 1;
279 ls->address_length = nxt_length("unix:");
280
281 break;
282
283 #endif
284
285 default:
286 case AF_INET:
287 ls->socklen = sizeof(struct sockaddr_in);
288 ls->address_length = NXT_INET_ADDR_STR_LEN;
289
290 break;
291 }
292 }
293
294
295 size_t
nxt_listen_socket_pool_min_size(nxt_listen_socket_t * ls)296 nxt_listen_socket_pool_min_size(nxt_listen_socket_t *ls)
297 {
298 size_t size;
299
300 /*
301 * The first nxt_sockaddr_t is intended for mandatory remote sockaddr
302 * and textual representaion with port. The second nxt_sockaddr_t
303 * is intended for local sockaddr without textual representaion which
304 * may be required to get specific address of connection received on
305 * wildcard AF_INET and AF_INET6 addresses. For AF_UNIX addresses
306 * the local sockaddr is not required.
307 */
308
309 switch (ls->sockaddr->u.sockaddr.sa_family) {
310
311 #if (NXT_INET6)
312
313 case AF_INET6:
314 ls->socklen = sizeof(struct sockaddr_in6);
315 ls->address_length = NXT_INET6_ADDR_STR_LEN;
316
317 size = offsetof(nxt_sockaddr_t, u) + sizeof(struct sockaddr_in6)
318 + NXT_INET6_ADDR_STR_LEN + nxt_length(":65535");
319
320 if (IN6_IS_ADDR_UNSPECIFIED(&ls->sockaddr->u.sockaddr_in6.sin6_addr)) {
321 size += offsetof(nxt_sockaddr_t, u) + sizeof(struct sockaddr_in6);
322 }
323
324 break;
325
326 #endif
327
328 #if (NXT_HAVE_UNIX_DOMAIN)
329
330 case AF_UNIX:
331 /*
332 * A remote socket is usually unbound and thus has unspecified Unix
333 * domain sockaddr_un which can be shortcut to 3 bytes. To handle
334 * a bound remote socket correctly ls->socklen should be at least
335 * sizeof(struct sockaddr_un), see comment in nxt_socket.h.
336 */
337 ls->socklen = 3;
338 size = ls->socklen + nxt_length("unix:");
339 ls->address_length = nxt_length("unix:");
340
341 break;
342
343 #endif
344
345 default:
346 ls->socklen = sizeof(struct sockaddr_in);
347 ls->address_length = NXT_INET_ADDR_STR_LEN;
348
349 size = offsetof(nxt_sockaddr_t, u) + sizeof(struct sockaddr_in)
350 + NXT_INET_ADDR_STR_LEN + nxt_length(":65535");
351
352 if (ls->sockaddr->u.sockaddr_in.sin_addr.s_addr == INADDR_ANY) {
353 size += offsetof(nxt_sockaddr_t, u) + sizeof(struct sockaddr_in);
354 }
355
356 break;
357 }
358
359 #if (NXT_TLS)
360
361 if (ls->tls) {
362 size += 4 * sizeof(void *) /* SSL/TLS connection */
363 + sizeof(nxt_buf_mem_t)
364 + sizeof(nxt_work_t); /* nxt_mp_cleanup */
365 }
366
367 #endif
368
369 return size // + sizeof(nxt_mem_pool_t)
370 + sizeof(nxt_conn_t)
371 + sizeof(nxt_log_t);
372 }
373
374
375 static u_char *
nxt_listen_socket_log_handler(void * ctx,u_char * pos,u_char * end)376 nxt_listen_socket_log_handler(void *ctx, u_char *pos, u_char *end)
377 {
378 nxt_sockaddr_t *sa;
379
380 sa = ctx;
381
382 return nxt_sprintf(pos, end, " while creating listening socket on %*s",
383 (size_t) sa->length, nxt_sockaddr_start(sa));
384 }
385