1 /* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
5 * Copyright (C) 2011 Data Differential, http://datadifferential.com/
6 * Copyright (C) 2006-2010 Brian Aker All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are
12 * * Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
15 * * Redistributions in binary form must reproduce the above
16 * copyright notice, this list of conditions and the following disclaimer
17 * in the documentation and/or other materials provided with the
20 * * The names of its contributors may not be used to endorse or
21 * promote products derived from this software without specific prior
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
25 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
26 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
27 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
28 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
29 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
30 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
31 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
34 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 #include <libmemcached/common.h>
44 static memcached_return_t
connect_poll(memcached_server_st
*ptr
)
48 fds
[0].events
= POLLOUT
;
52 while (--loop_max
) // Should only loop on cases of ERESTART or EINTR
55 if (ptr
->root
->poll_timeout
)
57 error
= poll(fds
, 1, ptr
->root
->connect_timeout
);
69 socklen_t len
= sizeof (err
);
70 (void)getsockopt(ptr
->fd
, SOL_SOCKET
, SO_ERROR
, &err
, &len
);
72 // We check the value to see what happened wth the socket.
75 return MEMCACHED_SUCCESS
;
78 return memcached_set_errno(*ptr
, err
, MEMCACHED_AT
);
82 return memcached_set_error(*ptr
, MEMCACHED_TIMEOUT
, MEMCACHED_AT
);
85 default: // A real error occurred and we need to completely bail
86 WATCHPOINT_ERRNO(get_socket_errno());
87 switch (get_socket_errno())
89 #ifdef TARGET_OS_LINUX
97 return memcached_set_error(*ptr
, MEMCACHED_MEMORY_ALLOCATION_FAILURE
, MEMCACHED_AT
);
100 return memcached_set_error(*ptr
, MEMCACHED_MEMORY_ALLOCATION_FAILURE
, MEMCACHED_AT
, memcached_literal_param("RLIMIT_NOFILE exceeded, or if OSX the timeout value was invalid"));
102 default: // This should not happen
103 if (fds
[0].revents
& POLLERR
)
106 socklen_t len
= sizeof (err
);
107 (void)getsockopt(ptr
->fd
, SOL_SOCKET
, SO_ERROR
, &err
, &len
);
108 ptr
->cached_errno
= (err
== 0) ? get_socket_errno() : err
;
112 ptr
->cached_errno
= get_socket_errno();
115 (void)closesocket(ptr
->fd
);
116 ptr
->fd
= INVALID_SOCKET
;
117 ptr
->state
= MEMCACHED_SERVER_STATE_NEW
;
119 return memcached_set_errno(*ptr
, get_socket_errno(), MEMCACHED_AT
);
124 // This should only be possible from ERESTART or EINTR;
125 return memcached_set_errno(*ptr
, get_socket_errno(), MEMCACHED_AT
);
128 static memcached_return_t
set_hostinfo(memcached_server_st
*server
)
130 assert(! server
->address_info
); // We cover the case where a programming mistake has been made.
131 if (server
->address_info
)
133 freeaddrinfo(server
->address_info
);
134 server
->address_info
= NULL
;
135 server
->address_info_next
= NULL
;
138 char str_port
[NI_MAXSERV
];
139 int length
= snprintf(str_port
, NI_MAXSERV
, "%u", (uint32_t)server
->port
);
140 if (length
>= NI_MAXSERV
|| length
< 0)
141 return MEMCACHED_FAILURE
;
143 struct addrinfo hints
;
144 memset(&hints
, 0, sizeof(struct addrinfo
));
147 hints
.ai_family
= AF_INET
;
149 if (server
->type
== MEMCACHED_CONNECTION_UDP
)
151 hints
.ai_protocol
= IPPROTO_UDP
;
152 hints
.ai_socktype
= SOCK_DGRAM
;
156 hints
.ai_socktype
= SOCK_STREAM
;
157 hints
.ai_protocol
= IPPROTO_TCP
;
161 switch(errcode
= getaddrinfo(server
->hostname
, str_port
, &hints
, &server
->address_info
))
167 return memcached_set_error(*server
, MEMCACHED_TIMEOUT
, MEMCACHED_AT
, memcached_string_make_from_cstr(gai_strerror(errcode
)));
170 return memcached_set_errno(*server
, errno
, MEMCACHED_AT
, memcached_literal_param("getaddrinfo(EAI_SYSTEM)"));
173 return memcached_set_error(*server
, MEMCACHED_INVALID_ARGUMENTS
, MEMCACHED_AT
, memcached_literal_param("getaddrinfo(EAI_BADFLAGS)"));
176 return memcached_set_error(*server
, MEMCACHED_MEMORY_ALLOCATION_FAILURE
, MEMCACHED_AT
, memcached_literal_param("getaddrinfo(EAI_MEMORY)"));
180 WATCHPOINT_STRING(server
->hostname
);
181 WATCHPOINT_STRING(gai_strerror(e
));
182 return memcached_set_error(*server
, MEMCACHED_HOST_LOOKUP_FAILURE
, MEMCACHED_AT
, memcached_string_make_from_cstr(gai_strerror(errcode
)));
185 server
->address_info_next
= server
->address_info
;
186 server
->state
= MEMCACHED_SERVER_STATE_ADDRINFO
;
188 return MEMCACHED_SUCCESS
;
191 static inline void set_socket_nonblocking(memcached_server_st
*ptr
)
195 if (ioctlsocket(ptr
->fd
, FIONBIO
, &arg
) == SOCKET_ERROR
)
197 memcached_set_errno(*ptr
, get_socket_errno(), NULL
);
204 flags
= fcntl(ptr
->fd
, F_GETFL
, 0);
205 } while (flags
== -1 && (errno
== EINTR
|| errno
== EAGAIN
));
209 memcached_set_errno(*ptr
, errno
, NULL
);
211 else if ((flags
& O_NONBLOCK
) == 0)
217 rval
= fcntl(ptr
->fd
, F_SETFL
, flags
| O_NONBLOCK
);
218 } while (rval
== -1 && (errno
== EINTR
|| errno
== EAGAIN
));
220 unlikely (rval
== -1)
222 memcached_set_errno(*ptr
, errno
, NULL
);
228 static void set_socket_options(memcached_server_st
*ptr
)
230 WATCHPOINT_ASSERT(ptr
->fd
!= -1);
232 if (ptr
->type
== MEMCACHED_CONNECTION_UDP
)
236 if (ptr
->root
->snd_timeout
)
239 struct timeval waittime
;
242 waittime
.tv_usec
= ptr
->root
->snd_timeout
;
244 error
= setsockopt(ptr
->fd
, SOL_SOCKET
, SO_SNDTIMEO
,
245 &waittime
, (socklen_t
)sizeof(struct timeval
));
246 WATCHPOINT_ASSERT(error
== 0);
251 if (ptr
->root
->rcv_timeout
)
254 struct timeval waittime
;
257 waittime
.tv_usec
= ptr
->root
->rcv_timeout
;
259 error
= setsockopt(ptr
->fd
, SOL_SOCKET
, SO_RCVTIMEO
,
260 &waittime
, (socklen_t
)sizeof(struct timeval
));
261 WATCHPOINT_ASSERT(error
== 0);
266 #if defined(__MACH__) && defined(__APPLE__) || defined(__FreeBSD__)
269 int error
= setsockopt(ptr
->fd
, SOL_SOCKET
, SO_NOSIGPIPE
, (void *)&set
, sizeof(int));
271 // This is not considered a fatal error
274 WATCHPOINT_ERRNO(get_socket_errno());
275 perror("setsockopt(SO_NOSIGPIPE)");
280 if (ptr
->root
->flags
.no_block
)
283 struct linger linger
;
286 linger
.l_linger
= 0; /* By default on close() just drop the socket */
287 error
= setsockopt(ptr
->fd
, SOL_SOCKET
, SO_LINGER
,
288 &linger
, (socklen_t
)sizeof(struct linger
));
289 WATCHPOINT_ASSERT(error
== 0);
292 if (ptr
->root
->flags
.tcp_nodelay
)
297 error
= setsockopt(ptr
->fd
, IPPROTO_TCP
, TCP_NODELAY
,
298 &flag
, (socklen_t
)sizeof(int));
299 WATCHPOINT_ASSERT(error
== 0);
302 if (ptr
->root
->flags
.tcp_keepalive
)
307 error
= setsockopt(ptr
->fd
, SOL_SOCKET
, SO_KEEPALIVE
,
308 &flag
, (socklen_t
)sizeof(int));
309 WATCHPOINT_ASSERT(error
== 0);
313 if (ptr
->root
->tcp_keepidle
> 0)
317 error
= setsockopt(ptr
->fd
, IPPROTO_TCP
, TCP_KEEPIDLE
,
318 &ptr
->root
->tcp_keepidle
, (socklen_t
)sizeof(int));
319 WATCHPOINT_ASSERT(error
== 0);
323 if (ptr
->root
->send_size
> 0)
327 error
= setsockopt(ptr
->fd
, SOL_SOCKET
, SO_SNDBUF
,
328 &ptr
->root
->send_size
, (socklen_t
)sizeof(int));
329 WATCHPOINT_ASSERT(error
== 0);
332 if (ptr
->root
->recv_size
> 0)
336 error
= setsockopt(ptr
->fd
, SOL_SOCKET
, SO_RCVBUF
,
337 &ptr
->root
->recv_size
, (socklen_t
)sizeof(int));
338 WATCHPOINT_ASSERT(error
== 0);
342 /* libmemcached will always use nonblocking IO to avoid write deadlocks */
343 set_socket_nonblocking(ptr
);
346 static memcached_return_t
unix_socket_connect(memcached_server_st
*ptr
)
349 WATCHPOINT_ASSERT(ptr
->fd
== -1);
351 if ((ptr
->fd
= socket(AF_UNIX
, SOCK_STREAM
, 0)) < 0)
353 return memcached_set_errno(*ptr
, errno
, NULL
);
356 struct sockaddr_un servAddr
;
358 memset(&servAddr
, 0, sizeof (struct sockaddr_un
));
359 servAddr
.sun_family
= AF_UNIX
;
360 strncpy(servAddr
.sun_path
, ptr
->hostname
, sizeof(servAddr
.sun_path
)); /* Copy filename */
363 if (connect(ptr
->fd
, (struct sockaddr
*)&servAddr
, sizeof(servAddr
)) < 0)
372 case EISCONN
: /* We were spinning waiting on connect */
374 WATCHPOINT_ASSERT(0); // Programmer error
379 WATCHPOINT_ERRNO(errno
);
380 return memcached_set_errno(*ptr
, errno
, MEMCACHED_AT
);
384 ptr
->state
= MEMCACHED_SERVER_STATE_CONNECTED
;
386 WATCHPOINT_ASSERT(ptr
->fd
!= INVALID_SOCKET
);
388 return MEMCACHED_SUCCESS
;
391 return MEMCACHED_NOT_SUPPORTED
;
395 static memcached_return_t
network_connect(memcached_server_st
*ptr
)
397 bool timeout_error_occured
= false;
399 WATCHPOINT_ASSERT(ptr
->fd
== INVALID_SOCKET
);
400 WATCHPOINT_ASSERT(ptr
->cursor_active
== 0);
402 if (not ptr
->address_info
)
404 WATCHPOINT_ASSERT(ptr
->state
== MEMCACHED_SERVER_STATE_NEW
);
405 memcached_return_t rc
;
409 if ((rc
= set_hostinfo(ptr
)) != MEMCACHED_TIMEOUT
)
413 struct timespec dream
, rem
;
418 nanosleep(&dream
, &rem
);
422 if (memcached_failed(rc
))
426 /* Create the socket */
427 while (ptr
->address_info_next
&& ptr
->fd
== INVALID_SOCKET
)
429 /* Memcache server does not support IPV6 in udp mode, so skip if not ipv4 */
430 if (ptr
->type
== MEMCACHED_CONNECTION_UDP
&& ptr
->address_info_next
->ai_family
!= AF_INET
)
432 ptr
->address_info_next
= ptr
->address_info_next
->ai_next
;
436 if ((ptr
->fd
= socket(ptr
->address_info_next
->ai_family
,
437 ptr
->address_info_next
->ai_socktype
,
438 ptr
->address_info_next
->ai_protocol
)) < 0)
440 return memcached_set_errno(*ptr
, get_socket_errno(), NULL
);
443 set_socket_options(ptr
);
445 /* connect to server */
446 if ((connect(ptr
->fd
, ptr
->address_info_next
->ai_addr
, ptr
->address_info_next
->ai_addrlen
) != SOCKET_ERROR
))
448 ptr
->state
= MEMCACHED_SERVER_STATE_CONNECTED
;
452 /* An error occurred */
453 switch (get_socket_errno())
456 timeout_error_occured
= true;
460 case EINPROGRESS
: // nonblocking mode - first return
461 case EALREADY
: // nonblocking mode - subsequent returns
463 ptr
->state
= MEMCACHED_SERVER_STATE_IN_PROGRESS
;
464 memcached_return_t rc
= connect_poll(ptr
);
466 if (memcached_success(rc
))
468 ptr
->state
= MEMCACHED_SERVER_STATE_CONNECTED
;
469 return MEMCACHED_SUCCESS
;
472 // A timeout here is treated as an error, we will not retry
473 if (rc
== MEMCACHED_TIMEOUT
)
475 timeout_error_occured
= true;
480 case EISCONN
: // we are connected :-)
481 WATCHPOINT_ASSERT(0); // This is a programmer's error
484 case EINTR
: // Special case, we retry ai_addr
485 (void)closesocket(ptr
->fd
);
486 ptr
->fd
= INVALID_SOCKET
;
487 ptr
->state
= MEMCACHED_SERVER_STATE_NEW
;
494 (void)closesocket(ptr
->fd
);
495 ptr
->fd
= INVALID_SOCKET
;
496 ptr
->address_info_next
= ptr
->address_info_next
->ai_next
;
499 WATCHPOINT_ASSERT(ptr
->fd
== INVALID_SOCKET
);
501 if (timeout_error_occured
)
503 if (ptr
->fd
!= INVALID_SOCKET
)
505 (void)closesocket(ptr
->fd
);
506 ptr
->fd
= INVALID_SOCKET
;
510 WATCHPOINT_STRING("Never got a good file descriptor");
511 /* Failed to connect. schedule next retry */
512 if (ptr
->root
->retry_timeout
)
514 struct timeval next_time
;
516 if (gettimeofday(&next_time
, NULL
) == 0)
517 ptr
->next_retry
= next_time
.tv_sec
+ ptr
->root
->retry_timeout
;
520 if (timeout_error_occured
)
521 return memcached_set_error(*ptr
, MEMCACHED_TIMEOUT
, MEMCACHED_AT
);
523 return memcached_set_error(*ptr
, MEMCACHED_CONNECTION_FAILURE
, MEMCACHED_AT
); /* The last error should be from connect() */
526 void set_last_disconnected_host(memcached_server_write_instance_st self
)
529 memcached_st
*root
= (memcached_st
*)self
->root
;
532 WATCHPOINT_STRING(self
->hostname
);
533 WATCHPOINT_NUMBER(self
->port
);
534 WATCHPOINT_ERRNO(self
->cached_errno
);
536 memcached_server_free(root
->last_disconnected_server
);
537 root
->last_disconnected_server
= memcached_server_clone(NULL
, self
);
540 memcached_return_t
memcached_connect(memcached_server_write_instance_st ptr
)
542 memcached_return_t rc
= MEMCACHED_NO_SERVERS
;
544 if (ptr
->fd
!= INVALID_SOCKET
)
545 return MEMCACHED_SUCCESS
;
547 LIBMEMCACHED_MEMCACHED_CONNECT_START();
549 /* both retry_timeout and server_failure_limit must be set in order to delay retrying a server on error. */
550 WATCHPOINT_ASSERT(ptr
->root
);
551 if (ptr
->root
->retry_timeout
&& ptr
->next_retry
)
553 struct timeval curr_time
;
555 gettimeofday(&curr_time
, NULL
);
557 // We should optimize this to remove the allocation if the server was
558 // the last server to die
559 if (ptr
->next_retry
> curr_time
.tv_sec
)
561 set_last_disconnected_host(ptr
);
563 return memcached_set_error(*ptr
, MEMCACHED_SERVER_MARKED_DEAD
, MEMCACHED_AT
);
567 // If we are over the counter failure, we just fail. Reject host only
568 // works if you have a set number of failures.
569 if (ptr
->root
->server_failure_limit
&& ptr
->server_failure_counter
>= ptr
->root
->server_failure_limit
)
571 set_last_disconnected_host(ptr
);
573 // @todo fix this by fixing behavior to no longer make use of
575 if (_is_auto_eject_host(ptr
->root
))
577 run_distribution((memcached_st
*)ptr
->root
);
580 return memcached_set_error(*ptr
, MEMCACHED_SERVER_MARKED_DEAD
, MEMCACHED_AT
);
583 /* We need to clean up the multi startup piece */
586 case MEMCACHED_CONNECTION_UNKNOWN
:
587 WATCHPOINT_ASSERT(0);
588 rc
= MEMCACHED_NOT_SUPPORTED
;
591 case MEMCACHED_CONNECTION_UDP
:
592 case MEMCACHED_CONNECTION_TCP
:
593 rc
= network_connect(ptr
);
594 #ifdef LIBMEMCACHED_WITH_SASL_SUPPORT
595 if (ptr
->fd
!= INVALID_SOCKET
&& ptr
->root
->sasl
.callbacks
)
597 rc
= memcached_sasl_authenticate_connection(ptr
);
598 if (memcached_failed(rc
))
600 (void)closesocket(ptr
->fd
);
601 ptr
->fd
= INVALID_SOCKET
;
607 case MEMCACHED_CONNECTION_UNIX_SOCKET
:
608 rc
= unix_socket_connect(ptr
);
611 case MEMCACHED_CONNECTION_MAX
:
613 WATCHPOINT_ASSERT(0);
616 if (memcached_success(rc
))
618 ptr
->server_failure_counter
= 0;
623 memcached_set_error(*ptr
, rc
, MEMCACHED_AT
);
624 ptr
->server_failure_counter
++;
625 set_last_disconnected_host(ptr
);
628 LIBMEMCACHED_MEMCACHED_CONNECT_END();