Line data Source code
1 : /* FreeTDS - Library of routines accessing Sybase and Microsoft databases
2 : * Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 Brian Bruns
3 : * Copyright (C) 2004-2015 Ziglio Frediano
4 : *
5 : * This library is free software; you can redistribute it and/or
6 : * modify it under the terms of the GNU Library General Public
7 : * License as published by the Free Software Foundation; either
8 : * version 2 of the License, or (at your option) any later version.
9 : *
10 : * This library is distributed in the hope that it will be useful,
11 : * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 : * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 : * Library General Public License for more details.
14 : *
15 : * You should have received a copy of the GNU Library General Public
16 : * License along with this library; if not, write to the
17 : * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 : * Boston, MA 02111-1307, USA.
19 : */
20 :
21 : #include <config.h>
22 :
23 : #include <stdarg.h>
24 : #include <stdio.h>
25 :
26 : #include <freetds/time.h>
27 :
28 : #if HAVE_SYS_TYPES_H
29 : #include <sys/types.h>
30 : #endif /* HAVE_SYS_TYPES_H */
31 :
32 : #if HAVE_ERRNO_H
33 : #include <errno.h>
34 : #endif /* HAVE_ERRNO_H */
35 :
36 : #if HAVE_UNISTD_H
37 : #include <unistd.h>
38 : #endif /* HAVE_UNISTD_H */
39 :
40 : #if HAVE_STDLIB_H
41 : #include <stdlib.h>
42 : #endif /* HAVE_STDLIB_H */
43 :
44 : #if HAVE_STRING_H
45 : #include <string.h>
46 : #endif /* HAVE_STRING_H */
47 :
48 : #if HAVE_SYS_SOCKET_H
49 : #include <sys/socket.h>
50 : #endif /* HAVE_SYS_SOCKET_H */
51 :
52 : #if HAVE_NETINET_IN_H
53 : #include <netinet/in.h>
54 : #endif /* HAVE_NETINET_IN_H */
55 :
56 : #if HAVE_NETINET_TCP_H
57 : #include <netinet/tcp.h>
58 : #endif /* HAVE_NETINET_TCP_H */
59 :
60 : #if HAVE_ARPA_INET_H
61 : #include <arpa/inet.h>
62 : #endif /* HAVE_ARPA_INET_H */
63 :
64 : #if HAVE_SYS_IOCTL_H
65 : #include <sys/ioctl.h>
66 : #endif /* HAVE_SYS_IOCTL_H */
67 :
68 : #if HAVE_SELECT_H
69 : #include <sys/select.h>
70 : #endif /* HAVE_SELECT_H */
71 :
72 : #if HAVE_FCNTL_H
73 : #include <fcntl.h>
74 : #endif /* HAVE_FCNTL_H */
75 :
76 : #ifdef HAVE_SYS_EVENTFD_H
77 : #include <sys/eventfd.h>
78 : #endif /* HAVE_SYS_EVENTFD_H */
79 :
80 : #ifdef _WIN32
81 : #include <winsock2.h>
82 : #include <ws2tcpip.h>
83 : #include <mstcpip.h>
84 : #endif
85 :
86 : #include <freetds/tds.h>
87 : #include <freetds/utils/string.h>
88 : #include <freetds/utils/nosigpipe.h>
89 : #include <freetds/tls.h>
90 : #include <freetds/replacements.h>
91 :
92 : #include <signal.h>
93 : #include <assert.h>
94 :
95 : /* error is always returned */
96 : #define TDSSELERR 0
97 : #define TDSPOLLURG 0x8000u
98 :
99 : #if ENABLE_ODBC_MARS
100 : static void tds_check_cancel(TDSCONNECTION *conn);
101 : #endif
102 :
103 :
104 : /**
105 : * \addtogroup network
106 : * @{
107 : */
108 :
109 : #if !defined(SOL_TCP) && (defined(IPPROTO_TCP) || defined(_WIN32))
110 : /* fix incompatibility between MS headers */
111 : # ifndef IPPROTO_TCP
112 : # define IPPROTO_TCP IPPROTO_TCP
113 : # endif
114 : # define SOL_TCP IPPROTO_TCP
115 : #endif
116 :
117 : /* Optimize the way we send packets */
118 : #undef USE_CORK
119 : #undef USE_NODELAY
120 : /* On early Linux use TCP_CORK if available */
121 : #if defined(__linux__) && defined(TCP_CORK)
122 : #define USE_CORK 1
123 : /* On *BSD try to use TCP_CORK */
124 : /*
125 : * NOPUSH flag do not behave in the same way
126 : * cf ML "FreeBSD 5.0 performance problems with TCP_NOPUSH"
127 : */
128 : #elif (defined(__FreeBSD__) || defined(__GNU_FreeBSD__) || defined(__OpenBSD__)) && defined(TCP_CORK)
129 : #define USE_CORK 1
130 : /* otherwise use NODELAY */
131 : #elif defined(TCP_NODELAY) && defined(SOL_TCP)
132 : #define USE_NODELAY 1
133 : /* under VMS we have to define TCP_NODELAY */
134 : #elif defined(__VMS)
135 : #define TCP_NODELAY 1
136 : #define USE_NODELAY 1
137 : #endif
138 :
139 : /**
140 : * Set socket to non-blocking
141 : * @param sock socket to set
142 : * @return 0 on success or error code
143 : */
144 : int
145 3659 : tds_socket_set_nonblocking(TDS_SYS_SOCKET sock)
146 : {
147 : #if !defined(_WIN32)
148 3659 : unsigned int ioctl_nonblocking = 1;
149 : #else
150 : u_long ioctl_nonblocking = 1;
151 : #endif
152 :
153 3659 : if (IOCTLSOCKET(sock, FIONBIO, &ioctl_nonblocking) >= 0)
154 : return 0;
155 0 : return sock_errno;
156 : }
157 :
158 : static void
159 2933 : tds_addrinfo_set_port(struct addrinfo *addr, unsigned int port)
160 : {
161 2933 : assert(addr != NULL);
162 :
163 2933 : switch(addr->ai_family) {
164 2933 : case AF_INET:
165 2933 : ((struct sockaddr_in *) addr->ai_addr)->sin_port = htons(port);
166 2933 : break;
167 :
168 : #ifdef AF_INET6
169 0 : case AF_INET6:
170 0 : ((struct sockaddr_in6 *) addr->ai_addr)->sin6_port = htons(port);
171 0 : break;
172 : #endif
173 : }
174 2933 : }
175 :
176 : const char*
177 2933 : tds_addrinfo2str(struct addrinfo *addr, char *name, int namemax)
178 : {
179 : #ifndef NI_NUMERICHOST
180 : #define NI_NUMERICHOST 0
181 : #endif
182 2933 : if (!name || namemax <= 0)
183 : return "";
184 2933 : if (getnameinfo(addr->ai_addr, addr->ai_addrlen, name, namemax, NULL, 0, NI_NUMERICHOST) == 0)
185 : return name;
186 0 : name[0] = 0;
187 0 : return name;
188 : }
189 :
190 : /**
191 : * Returns error stored in the socket
192 : */
193 : static int
194 2931 : tds_get_socket_error(TDS_SYS_SOCKET sock)
195 : {
196 : int err;
197 2931 : SOCKLEN_T optlen = sizeof(err);
198 : char *errstr;
199 :
200 : /* check socket error */
201 2931 : if (tds_getsockopt(sock, SOL_SOCKET, SO_ERROR, (char *) &err, &optlen) != 0) {
202 0 : err = sock_errno;
203 0 : errstr = sock_strerror(err);
204 0 : tdsdump_log(TDS_DBG_ERROR, "getsockopt(2) failed: %s\n", errstr);
205 : sock_strerror_free(errstr);
206 2931 : } else if (err != 0) {
207 0 : errstr = sock_strerror(err);
208 0 : tdsdump_log(TDS_DBG_ERROR, "getsockopt(2) reported: %s\n", errstr);
209 : sock_strerror_free(errstr);
210 : }
211 2931 : return err;
212 : }
213 :
214 : /**
215 : * Setup the socket and attempt a connection.
216 : * Function allocate the socket in *p_sock and try to start a connection.
217 : * @param p_sock where returned socket is stored. Socket is stored even on error.
218 : * Can be INVALID_SOCKET.
219 : * @param addr address to use for attempting the connection
220 : * @param port port to connect to
221 : * @param p_oserr where system error is returned
222 : * @returns TDSEOK is success, TDSEINPROGRESS if connection attempt is started
223 : * or any other error.
224 : */
225 : static TDSERRNO
226 2931 : tds_setup_socket(TDS_SYS_SOCKET *p_sock, struct addrinfo *addr, unsigned int port, int *p_oserr)
227 : {
228 : enum {
229 : TDS_SOCKET_KEEPALIVE_IDLE = 40,
230 : TDS_SOCKET_KEEPALIVE_INTERVAL = 2
231 : };
232 : TDS_SYS_SOCKET sock;
233 : char ipaddr[128];
234 : int retval, len, err;
235 : char *errstr;
236 : #if defined(_WIN32)
237 : struct tcp_keepalive keepalive = {
238 : TRUE,
239 : TDS_SOCKET_KEEPALIVE_IDLE * 1000,
240 : TDS_SOCKET_KEEPALIVE_INTERVAL * 1000
241 : };
242 : DWORD written;
243 : #endif
244 :
245 2931 : *p_oserr = 0;
246 :
247 2931 : tds_addrinfo_set_port(addr, port);
248 2931 : tds_addrinfo2str(addr, ipaddr, sizeof(ipaddr));
249 :
250 2931 : *p_sock = sock = socket(addr->ai_family, SOCK_STREAM, 0);
251 2931 : if (TDS_IS_SOCKET_INVALID(sock)) {
252 0 : errstr = sock_strerror(*p_oserr = sock_errno);
253 0 : tdsdump_log(TDS_DBG_ERROR, "socket creation error: %s\n", errstr);
254 : sock_strerror_free(errstr);
255 : return TDSESOCK;
256 : }
257 :
258 : #ifdef SO_KEEPALIVE
259 2931 : len = 1;
260 2931 : setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (const void *) &len, sizeof(len));
261 : #endif
262 :
263 : #if defined(_WIN32)
264 : if (WSAIoctl(sock, SIO_KEEPALIVE_VALS, &keepalive, sizeof(keepalive),
265 : NULL, 0, &written, NULL, NULL) != 0) {
266 : errstr = sock_strerror(*p_oserr = sock_errno);
267 : tdsdump_log(TDS_DBG_ERROR, "error setting keepalive: %s\n", errstr);
268 : sock_strerror_free(errstr);
269 : }
270 : #elif defined(TCP_KEEPIDLE) && defined(TCP_KEEPINTVL)
271 2931 : len = TDS_SOCKET_KEEPALIVE_IDLE;
272 2931 : setsockopt(sock, SOL_TCP, TCP_KEEPIDLE, (const void *) &len, sizeof(len));
273 2931 : len = TDS_SOCKET_KEEPALIVE_INTERVAL;
274 2931 : setsockopt(sock, SOL_TCP, TCP_KEEPINTVL, (const void *) &len, sizeof(len));
275 : #endif
276 :
277 : #if defined(SO_NOSIGPIPE)
278 : len = 1;
279 : if (setsockopt(sock, SOL_SOCKET, SO_NOSIGPIPE, (const void *) &len, sizeof(len))) {
280 : *p_oserr = sock_errno;
281 : return TDSESOCK;
282 : }
283 : #endif
284 :
285 2931 : len = 1;
286 : #if defined(USE_NODELAY)
287 : setsockopt(sock, SOL_TCP, TCP_NODELAY, (const void *) &len, sizeof(len));
288 : #elif defined(USE_CORK)
289 2931 : setsockopt(sock, SOL_TCP, TCP_NODELAY, (const void *) &len, sizeof(len));
290 2931 : setsockopt(sock, SOL_TCP, TCP_CORK, (const void *) &len, sizeof(len));
291 : #else
292 : #error One should be defined
293 : #endif
294 :
295 2931 : tdsdump_log(TDS_DBG_INFO1, "Connecting to %s port %d\n", ipaddr, port);
296 :
297 : #ifdef DOS32X /* the other connection doesn't work on WATTCP32 */
298 : if (connect(sock, addr->ai_addr, addr->ai_addrlen) < 0) {
299 : *p_oserr = sock_errno;
300 : tdsdump_log(TDS_DBG_ERROR, "tds_setup_socket(): %s:%d", ipaddr, port);
301 : return TDSECONN;
302 : }
303 : return TDSEOK;
304 : #else
305 2931 : if ((*p_oserr = tds_socket_set_nonblocking(sock)) != 0) {
306 : return TDSEUSCT; /* close enough: "Unable to set communications timer" */
307 : }
308 2931 : retval = connect(sock, addr->ai_addr, addr->ai_addrlen);
309 2931 : if (retval == 0) {
310 0 : tdsdump_log(TDS_DBG_INFO2, "connection established\n");
311 : return TDSEOK;
312 : }
313 :
314 : /* got some kind of error */
315 2931 : err = *p_oserr = sock_errno;
316 2931 : errstr = sock_strerror(err);
317 2931 : tdsdump_log(TDS_DBG_ERROR, "tds_setup_socket: connect(2) returned \"%s\"\n", errstr);
318 : sock_strerror_free(errstr);
319 :
320 : /* connection attempt started */
321 2931 : if (err == TDSSOCK_EINPROGRESS)
322 : return TDSEINPROGRESS;
323 :
324 : #if DEBUGGING_CONNECTING_PROBLEM
325 : if (err != ECONNREFUSED && err != ENETUNREACH) {
326 : tdsdump_dump_buf(TDS_DBG_ERROR, "Contents of sockaddr_in", addr->ai_addr, addr->ai_addrlen);
327 : tdsdump_log(TDS_DBG_ERROR, " sockaddr_in:\t"
328 : "%s = %x\n"
329 : "\t\t\t%s = %x\n"
330 : "\t\t\t%s = %s\n"
331 : , "sin_family", addr->ai_family
332 : , "port", port
333 : , "address", ipaddr
334 : );
335 : }
336 : #endif
337 0 : return TDSECONN;
338 : #endif /* not DOS32X */
339 : }
340 :
341 : typedef struct {
342 : struct addrinfo *addr;
343 : unsigned next_retry_time;
344 : unsigned retry_count;
345 : } retry_addr;
346 :
347 : TDSERRNO
348 2931 : tds_open_socket(TDSSOCKET *tds, struct addrinfo *addr, unsigned int port, int timeout, int *p_oserr)
349 : {
350 2931 : TDSCONNECTION *conn = tds->conn;
351 : size_t len, i;
352 : int oserr;
353 : TDSERRNO tds_error;
354 : struct addrinfo *curr_addr;
355 : struct pollfd *fds;
356 : retry_addr *addresses;
357 : unsigned curr_time, start_time;
358 : typedef struct {
359 : retry_addr retry;
360 : struct pollfd fd;
361 : } alloc_addr;
362 : enum { MAX_RETRY = 10 };
363 :
364 2931 : *p_oserr = 0;
365 :
366 2931 : if (!addr)
367 : return TDSECONN;
368 :
369 2935 : tdsdump_log(TDS_DBG_INFO1, "Connecting with protocol version %d.%d\n",
370 4 : TDS_MAJOR(conn), TDS_MINOR(conn));
371 :
372 5862 : for (len = 0, curr_addr = addr; curr_addr != NULL; curr_addr = curr_addr->ai_next)
373 2931 : ++len;
374 :
375 2931 : addresses = (retry_addr *) tds_new0(alloc_addr, len);
376 2931 : if (!addresses)
377 : return TDSEMEM;
378 2931 : fds = (struct pollfd *) &addresses[len];
379 :
380 2931 : tds_error = TDSECONN;
381 :
382 : /* fill all structures */
383 2931 : curr_time = start_time = tds_gettime_ms();
384 5862 : for (len = 0, curr_addr = addr; curr_addr != NULL; curr_addr = curr_addr->ai_next) {
385 2931 : fds[len].fd = INVALID_SOCKET;
386 2931 : addresses[len].addr = curr_addr;
387 2931 : addresses[len].next_retry_time = curr_time;
388 2931 : addresses[len].retry_count = 0;
389 2931 : ++len;
390 : }
391 :
392 : /* if we have only one address means that availability groups feature is not
393 : * present, avoid to check the addresses multiple times */
394 2931 : if (len == 1)
395 2931 : addresses[0].retry_count = MAX_RETRY;
396 :
397 2931 : timeout *= 1000;
398 2931 : if (!timeout) {
399 : /* A timeout of zero means wait forever */
400 0 : timeout = -1;
401 : }
402 :
403 : /* now the list is full with sockets trying to connect */
404 2931 : while (len) {
405 2931 : int rc, poll_timeout = timeout;
406 :
407 : /* timeout */
408 2931 : if (poll_timeout >= 0) {
409 2931 : if (curr_time - start_time > (unsigned) poll_timeout) {
410 0 : *p_oserr = TDSSOCK_ETIMEDOUT;
411 : goto exit;
412 : }
413 2931 : poll_timeout -= curr_time - start_time;
414 : }
415 :
416 : /* try again if needed */
417 2931 : for (i = 0; i < len; ++i) {
418 : int time_left;
419 :
420 2931 : if (!TDS_IS_SOCKET_INVALID(fds[i].fd))
421 0 : continue;
422 2931 : time_left = addresses[i].next_retry_time - curr_time;
423 2931 : if (time_left <= 0) {
424 : TDS_SYS_SOCKET sock;
425 2931 : tds_error = tds_setup_socket(&sock, addresses[i].addr, port, p_oserr);
426 2931 : switch (tds_error) {
427 0 : case TDSEOK:
428 : /* connected! */
429 : /* free other sockets and continue with this one */
430 0 : conn->s = sock;
431 0 : tds_error = TDSEOK;
432 0 : goto exit;
433 2931 : case TDSEINPROGRESS:
434 : /* save socket in the list */
435 2931 : fds[i].fd = sock;
436 : break;
437 0 : default:
438 : /* error, continue with other addresses */
439 0 : if (!TDS_IS_SOCKET_INVALID(sock))
440 0 : CLOSESOCKET(sock);
441 0 : --len;
442 0 : fds[i] = fds[len];
443 0 : addresses[i] = addresses[len];
444 0 : --i;
445 0 : continue;
446 : }
447 : } else {
448 : /* update timeout */
449 0 : if (time_left < poll_timeout || poll_timeout < 0)
450 0 : poll_timeout = time_left;
451 : }
452 : }
453 :
454 : /* wait activities on file descriptors */
455 2931 : for (i = 0; i < len; ++i) {
456 2931 : fds[i].revents = 0;
457 2931 : fds[i].events = TDSSELWRITE|TDSSELERR;
458 : }
459 2931 : tds_error = TDSECONN;
460 2931 : rc = poll(fds, len, poll_timeout);
461 2931 : oserr = sock_errno; /* save to avoid overrides */
462 2931 : curr_time = tds_gettime_ms();
463 :
464 : /* error */
465 2931 : if (rc < 0) {
466 0 : *p_oserr = oserr;
467 0 : if (*p_oserr == TDSSOCK_EINTR)
468 0 : continue;
469 : goto exit;
470 : }
471 :
472 : /* got some event on file descriptors */
473 0 : for (i = 0; i < len; ++i) {
474 2931 : if (TDS_IS_SOCKET_INVALID(fds[i].fd))
475 0 : continue;
476 2931 : if (!fds[i].revents)
477 0 : continue;
478 2931 : *p_oserr = tds_get_socket_error(fds[i].fd);
479 2931 : if (*p_oserr || (fds[i].revents & POLLERR) != 0) {
480 : /* error, remove from list and possibly make
481 : * the loop exit */
482 0 : CLOSESOCKET(fds[i].fd);
483 0 : fds[i].fd = INVALID_SOCKET;
484 0 : addresses[i].next_retry_time = curr_time + 1000;
485 0 : if (++addresses[i].retry_count >= MAX_RETRY || len == 1) {
486 0 : --len;
487 0 : fds[i] = fds[len];
488 0 : addresses[i] = addresses[len];
489 0 : --i;
490 : }
491 0 : continue;
492 : }
493 2931 : if (fds[i].revents & POLLOUT) {
494 2931 : conn->s = fds[i].fd;
495 2931 : fds[i].fd = INVALID_SOCKET;
496 2931 : tds_error = TDSEOK;
497 : goto exit;
498 : }
499 : }
500 : }
501 :
502 0 : exit:
503 : if (tds_error != TDSEOK) {
504 0 : tdsdump_log(TDS_DBG_ERROR, "tds_open_socket() failed\n");
505 : } else {
506 2931 : tdsdump_log(TDS_DBG_INFO2, "tds_open_socket() succeeded\n");
507 2931 : tds->state = TDS_IDLE;
508 : }
509 :
510 5862 : while (len > 0) {
511 2931 : --len;
512 2931 : if (!TDS_IS_SOCKET_INVALID(fds[len].fd))
513 0 : CLOSESOCKET(fds[len].fd);
514 : }
515 2931 : free(addresses);
516 2931 : return tds_error;
517 : }
518 :
519 : /**
520 : * Close current socket.
521 : * For last socket close entire connection.
522 : * For MARS send FIN request.
523 : * This attempts a graceful disconnection, for ungraceful call
524 : * tds_connection_close.
525 : */
526 : void
527 4058 : tds_close_socket(TDSSOCKET * tds)
528 : {
529 4058 : if (!IS_TDSDEAD(tds)) {
530 : #if ENABLE_ODBC_MARS
531 1428 : TDSCONNECTION *conn = tds->conn;
532 1428 : unsigned n = 0, count = 0;
533 1428 : tds_mutex_lock(&conn->list_mtx);
534 92820 : for (; n < conn->num_sessions; ++n)
535 91392 : if (TDSSOCKET_VALID(conn->sessions[n]))
536 1428 : ++count;
537 1428 : if (count > 1)
538 0 : tds_append_fin(tds);
539 1428 : tds_mutex_unlock(&conn->list_mtx);
540 1428 : if (count <= 1) {
541 1428 : tds_disconnect(tds);
542 1428 : tds_connection_close(conn);
543 : } else {
544 0 : tds_set_state(tds, TDS_DEAD);
545 : }
546 : #else
547 1427 : tds_disconnect(tds);
548 1427 : if (!TDS_IS_SOCKET_INVALID(tds_get_s(tds)) && CLOSESOCKET(tds_get_s(tds)) == -1)
549 0 : tdserror(tds_get_ctx(tds), tds, TDSECLOS, sock_errno);
550 1427 : tds_set_s(tds, INVALID_SOCKET);
551 1427 : tds_set_state(tds, TDS_DEAD);
552 : #endif
553 : }
554 4058 : }
555 :
556 : void
557 5405 : tds_connection_close(TDSCONNECTION *conn)
558 : {
559 : #if ENABLE_ODBC_MARS
560 3474 : unsigned n = 0;
561 : #endif
562 :
563 5405 : if (!TDS_IS_SOCKET_INVALID(conn->s)) {
564 : /* TODO check error ?? how to return it ?? */
565 2325 : CLOSESOCKET(conn->s);
566 2325 : conn->s = INVALID_SOCKET;
567 : }
568 :
569 : #if ENABLE_ODBC_MARS
570 3474 : tds_mutex_lock(&conn->list_mtx);
571 225810 : for (; n < conn->num_sessions; ++n)
572 222336 : if (TDSSOCKET_VALID(conn->sessions[n]))
573 1553 : tds_set_state(conn->sessions[n], TDS_DEAD);
574 3474 : tds_mutex_unlock(&conn->list_mtx);
575 : #else
576 1931 : tds_set_state((TDSSOCKET* ) conn, TDS_DEAD);
577 : #endif
578 5405 : }
579 :
580 : /**
581 : * Select on a socket until it's available or the timeout expires.
582 : * Meanwhile, call the interrupt function.
583 : * \return >0 ready descriptors
584 : * 0 timeout
585 : * <0 error (cf. errno). Caller should close socket and return failure.
586 : * This function does not call tdserror or close the socket because it can't know the context in which it's being called.
587 : */
588 : int
589 299671 : tds_select(TDSSOCKET * tds, unsigned tds_sel, int timeout_seconds)
590 : {
591 : int rc, seconds;
592 : unsigned int poll_seconds;
593 :
594 299671 : assert(tds != NULL);
595 299671 : assert(timeout_seconds >= 0);
596 :
597 : /*
598 : * The select loop.
599 : * If an interrupt handler is installed, we iterate once per second,
600 : * else we try once, timing out after timeout_seconds (0 == never).
601 : * If select(2) is interrupted by a signal (e.g. press ^C in sqsh), we timeout.
602 : * (The application can retry if desired by installing a signal handler.)
603 : *
604 : * We do not measure current time against end time, to avoid being tricked by ntpd(8) or similar.
605 : * Instead, we just count down.
606 : *
607 : * We exit on the first of these events:
608 : * 1. a descriptor is ready. (return to caller)
609 : * 2. select(2) returns an important error. (return to caller)
610 : * A timeout of zero says "wait forever". We do that by passing a NULL timeval pointer to select(2).
611 : */
612 299671 : poll_seconds = (tds_get_ctx(tds) && tds_get_ctx(tds)->int_handler)? 1 : timeout_seconds;
613 300119 : for (seconds = timeout_seconds; timeout_seconds == 0 || seconds > 0; seconds -= poll_seconds) {
614 : struct pollfd fds[2];
615 299871 : int timeout = poll_seconds ? poll_seconds * 1000 : -1;
616 :
617 299871 : if (TDS_IS_SOCKET_INVALID(tds_get_s(tds)))
618 299423 : return -1;
619 :
620 376066 : if ((tds_sel & TDSSELREAD) != 0 && tds->conn->tls_session && tds_ssl_pending(tds->conn))
621 : return POLLIN;
622 :
623 285866 : fds[0].fd = tds_get_s(tds);
624 285866 : fds[0].events = tds_sel;
625 285866 : fds[0].revents = 0;
626 285866 : fds[1].fd = tds_wakeup_get_fd(&tds->conn->wakeup);
627 285866 : fds[1].events = POLLIN;
628 285866 : fds[1].revents = 0;
629 285866 : rc = poll(fds, 2, timeout);
630 :
631 285866 : if (rc > 0 ) {
632 285418 : if (fds[0].revents & POLLERR) {
633 4 : set_sock_errno(TDSSOCK_ECONNRESET);
634 4 : return -1;
635 : }
636 285414 : rc = fds[0].revents;
637 285414 : if (fds[1].revents) {
638 : #if ENABLE_ODBC_MARS
639 98 : tds_check_cancel(tds->conn);
640 : #endif
641 224 : rc |= TDSPOLLURG;
642 : }
643 : return rc;
644 : }
645 :
646 448 : if (rc < 0) {
647 : char *errstr;
648 :
649 16 : switch (sock_errno) {
650 16 : case TDSSOCK_EINTR:
651 : case EAGAIN:
652 : case TDSSOCK_EINPROGRESS:
653 : /* FIXME this should be global maximun, not loop one */
654 16 : seconds += poll_seconds;
655 16 : break; /* let interrupt handler be called */
656 0 : default: /* documented: EFAULT, EBADF, EINVAL */
657 0 : errstr = sock_strerror(sock_errno);
658 0 : tdsdump_log(TDS_DBG_ERROR, "error: poll(2) returned %d, \"%s\"\n",
659 : sock_errno, errstr);
660 : sock_strerror_free(errstr);
661 : return rc;
662 : }
663 432 : }
664 :
665 448 : assert(rc == 0 || (rc < 0 && (sock_errno == TDSSOCK_EINTR ||
666 : sock_errno == EAGAIN ||
667 : sock_errno == TDSSOCK_EINPROGRESS
668 : )));
669 :
670 448 : if (tds_get_ctx(tds) && tds_get_ctx(tds)->int_handler) { /* interrupt handler installed */
671 : /*
672 : * "If hndlintr() returns INT_CANCEL, DB-Library sends an attention token [TDS_BUFSTAT_ATTN]
673 : * to the server. This causes the server to discontinue command processing.
674 : * The server may send additional results that have already been computed.
675 : * When control returns to the mainline code, the mainline code should do
676 : * one of the following:
677 : * - Flush the results using dbcancel
678 : * - Process the results normally"
679 : */
680 264 : int timeout_action = (*tds_get_ctx(tds)->int_handler) (tds_get_parent(tds));
681 264 : switch (timeout_action) {
682 264 : case TDS_INT_CONTINUE: /* keep waiting */
683 264 : continue;
684 : case TDS_INT_CANCEL: /* abort the current command batch */
685 : /* FIXME tell tds_goodread() not to call tdserror() */
686 : return 0;
687 0 : default:
688 0 : tdsdump_log(TDS_DBG_NETWORK,
689 : "tds_select: invalid interrupt handler return code: %d\n", timeout_action);
690 : return -1;
691 : }
692 : }
693 : /*
694 : * We can reach here if no interrupt handler was installed and we either timed out or got EINTR.
695 : * We cannot be polling, so we are about to drop out of the loop.
696 : */
697 184 : assert(poll_seconds == timeout_seconds);
698 : }
699 :
700 : return 0;
701 : }
702 :
703 : /**
704 : * Read from an OS socket
705 : * @TODO remove tds, save error somewhere, report error in another way
706 : * @returns 0 if blocking, <0 error >0 bytes read
707 : */
708 : static int
709 178372 : tds_socket_read(TDSCONNECTION * conn, TDSSOCKET *tds, unsigned char *buf, int buflen)
710 : {
711 : int len, err;
712 :
713 : #if ENABLE_EXTRA_CHECKS
714 : /* this simulate the fact that recv can return less bytes */
715 178372 : if (buflen >= 5) {
716 : static int cnt = 0;
717 154170 : if (++cnt == 5) {
718 30184 : cnt = 0;
719 30184 : buflen -= 3;
720 : }
721 : }
722 : #endif
723 :
724 : /* read directly from socket*/
725 178372 : len = READSOCKET(conn->s, buf, buflen);
726 178372 : if (len > 0)
727 : return len;
728 :
729 18 : err = sock_errno;
730 18 : if (len < 0 && TDSSOCK_WOULDBLOCK(err))
731 : return 0;
732 :
733 : /* detect connection close */
734 18 : tds_connection_close(conn);
735 18 : tdserror(conn->tds_ctx, tds, len == 0 ? TDSESEOF : TDSEREAD, len == 0 ? 0 : err);
736 18 : return -1;
737 : }
738 :
739 : /**
740 : * Write to an OS socket
741 : * @returns 0 if blocking, <0 error >0 bytes readed
742 : */
743 : static int
744 88165 : tds_socket_write(TDSCONNECTION *conn, TDSSOCKET *tds, const unsigned char *buf, int buflen)
745 : {
746 : int err, len;
747 : char *errstr;
748 :
749 : #if ENABLE_EXTRA_CHECKS
750 : /* this simulate the fact that send can return less bytes */
751 88165 : if (buflen >= 11) {
752 : static int cnt = 0;
753 72321 : if (++cnt == 5) {
754 13838 : cnt = 0;
755 13838 : buflen -= 3;
756 : }
757 : }
758 : #endif
759 :
760 : #if defined(SO_NOSIGPIPE)
761 : len = send(conn->s, buf, buflen, 0);
762 : #else
763 88165 : len = WRITESOCKET(conn->s, buf, buflen);
764 : #endif
765 88165 : if (len > 0)
766 : return len;
767 :
768 60 : err = sock_errno;
769 60 : if (0 == len || TDSSOCK_WOULDBLOCK(err) || err == TDSSOCK_EINTR)
770 : return 0;
771 :
772 60 : assert(len < 0);
773 :
774 : /* detect connection close */
775 60 : errstr = sock_strerror(err);
776 60 : tdsdump_log(TDS_DBG_NETWORK, "send(2) failed: %d (%s)\n", err, errstr);
777 : sock_strerror_free(errstr);
778 60 : tds_connection_close(conn);
779 60 : tdserror(conn->tds_ctx, tds, TDSEWRIT, err);
780 60 : return -1;
781 : }
782 :
783 : int
784 3829 : tds_wakeup_init(TDSPOLLWAKEUP *wakeup)
785 : {
786 : TDS_SYS_SOCKET sv[2];
787 : int ret;
788 :
789 3829 : wakeup->s_signal = wakeup->s_signaled = INVALID_SOCKET;
790 : #if defined(__linux__) && HAVE_EVENTFD
791 : # ifdef EFD_CLOEXEC
792 3829 : ret = eventfd(0, EFD_CLOEXEC|EFD_NONBLOCK);
793 : # else
794 : ret = -1;
795 : # endif
796 : /* Linux version up to 2.6.26 do not support flags, try without */
797 3829 : if (ret < 0 && (ret = eventfd(0, 0)) >= 0) {
798 0 : fcntl(ret, F_SETFD, fcntl(ret, F_GETFD, 0) | FD_CLOEXEC);
799 0 : fcntl(ret, F_SETFL, fcntl(ret, F_GETFL, 0) | O_NONBLOCK);
800 : }
801 3829 : if (ret >= 0) {
802 3829 : wakeup->s_signaled = ret;
803 3829 : return 0;
804 : }
805 : #endif
806 0 : ret = socketpair(AF_UNIX, SOCK_STREAM, 0, sv);
807 0 : if (ret)
808 : return ret;
809 0 : wakeup->s_signal = sv[0];
810 0 : wakeup->s_signaled = sv[1];
811 0 : return 0;
812 : }
813 :
814 : void
815 3805 : tds_wakeup_close(TDSPOLLWAKEUP *wakeup)
816 : {
817 3805 : if (!TDS_IS_SOCKET_INVALID(wakeup->s_signal))
818 0 : CLOSESOCKET(wakeup->s_signal);
819 3805 : if (!TDS_IS_SOCKET_INVALID(wakeup->s_signaled))
820 3805 : CLOSESOCKET(wakeup->s_signaled);
821 3805 : }
822 :
823 :
824 : void
825 226 : tds_wakeup_send(TDSPOLLWAKEUP *wakeup, char cancel)
826 : {
827 : #if defined(__linux__) && HAVE_EVENTFD
828 226 : if (wakeup->s_signal == -1) {
829 226 : uint64_t one = 1;
830 226 : (void) write(wakeup->s_signaled, &one, sizeof(one));
831 : return;
832 : }
833 : #endif
834 0 : send(wakeup->s_signal, &cancel, sizeof(cancel), 0);
835 : }
836 :
837 : static int
838 223 : tds_connection_signaled(TDSCONNECTION *conn)
839 : {
840 : int len;
841 : char to_cancel[16];
842 :
843 : #if defined(__linux__) && HAVE_EVENTFD
844 223 : if (conn->wakeup.s_signal == -1)
845 223 : return read(conn->wakeup.s_signaled, to_cancel, 8) > 0;
846 : #endif
847 :
848 0 : len = READSOCKET(conn->wakeup.s_signaled, to_cancel, sizeof(to_cancel));
849 : do {
850 : /* no cancel found */
851 0 : if (len <= 0)
852 : return 0;
853 0 : } while(!to_cancel[--len]);
854 : return 1;
855 : }
856 :
857 : #if ENABLE_ODBC_MARS
858 : static void
859 98 : tds_check_cancel(TDSCONNECTION *conn)
860 : {
861 : TDSSOCKET *tds;
862 : int rc;
863 :
864 98 : if (!tds_connection_signaled(conn))
865 : return;
866 :
867 : do {
868 98 : unsigned n = 0;
869 :
870 98 : rc = TDS_SUCCESS;
871 98 : tds_mutex_lock(&conn->list_mtx);
872 : /* Here we scan all list searching for sessions that should send cancel packets */
873 6370 : for (; n < conn->num_sessions; ++n)
874 6272 : if (TDSSOCKET_VALID(tds=conn->sessions[n]) && tds->in_cancel == 1) {
875 : /* send cancel */
876 98 : tds->in_cancel = 2;
877 98 : tds_mutex_unlock(&conn->list_mtx);
878 98 : rc = tds_append_cancel(tds);
879 98 : tds_mutex_lock(&conn->list_mtx);
880 98 : if (rc != TDS_SUCCESS)
881 : break;
882 : }
883 98 : tds_mutex_unlock(&conn->list_mtx);
884 : /* for all failed */
885 : /* this must be done outside loop cause it can alter list */
886 : /* this must be done unlocked cause it can lock again */
887 98 : if (rc != TDS_SUCCESS)
888 0 : tds_close_socket(tds);
889 98 : } while(rc != TDS_SUCCESS);
890 : }
891 : #endif
892 :
893 : /**
894 : * Loops until we have received some characters
895 : * return -1 on failure
896 : */
897 : int
898 107945 : tds_goodread(TDSSOCKET * tds, unsigned char *buf, int buflen)
899 : {
900 107945 : if (tds == NULL || buf == NULL || buflen < 1)
901 : return -1;
902 :
903 : for (;;) {
904 : int len, err;
905 :
906 : /* FIXME this block writing from other sessions */
907 108174 : len = tds_select(tds, TDSSELREAD, tds->query_timeout);
908 : #if !ENABLE_ODBC_MARS
909 86232 : if (len > 0 && (len & TDSPOLLURG)) {
910 125 : tds_connection_signaled(tds->conn);
911 : /* send cancel */
912 125 : if (tds->in_cancel == 1)
913 105 : tds_put_cancel(tds);
914 125 : continue;
915 : }
916 : #endif
917 108049 : if (len > 0) {
918 107923 : len = tds_socket_read(tds->conn, tds, buf, buflen);
919 107923 : if (len == 0)
920 0 : continue;
921 : return len;
922 : }
923 :
924 : /* error */
925 126 : if (len < 0) {
926 2 : if (TDSSOCK_WOULDBLOCK(sock_errno)) /* shouldn't happen, but OK */
927 0 : continue;
928 2 : err = sock_errno;
929 2 : tds_connection_close(tds->conn);
930 2 : tdserror(tds_get_ctx(tds), tds, TDSEREAD, err);
931 2 : return -1;
932 : }
933 :
934 : /* timeout */
935 124 : switch (tdserror(tds_get_ctx(tds), tds, TDSETIME, sock_errno)) {
936 : case TDS_INT_CONTINUE:
937 : break;
938 20 : default:
939 : case TDS_INT_CANCEL:
940 20 : tds_close_socket(tds);
941 20 : return -1;
942 : }
943 : }
944 : }
945 :
946 : int
947 176016 : tds_connection_read(TDSSOCKET * tds, unsigned char *buf, int buflen)
948 : {
949 176016 : TDSCONNECTION *conn = tds->conn;
950 :
951 176016 : if (conn->tls_session)
952 41105 : return tds_ssl_read(conn, buf, buflen);
953 :
954 : #if ENABLE_ODBC_MARS
955 70449 : return tds_socket_read(conn, tds, buf, buflen);
956 : #else
957 64462 : return tds_goodread(tds, buf, buflen);
958 : #endif
959 : }
960 :
961 : /**
962 : * \param tds the famous socket
963 : * \param buffer data to send
964 : * \param buflen bytes in buffer
965 : * \param last 1 if this is the last packet, else 0
966 : * \return length written (>0), <0 on failure
967 : */
968 : int
969 46442 : tds_goodwrite(TDSSOCKET * tds, const unsigned char *buffer, size_t buflen)
970 : {
971 : int len;
972 46442 : size_t sent = 0;
973 :
974 46442 : assert(tds && buffer);
975 :
976 101600 : while (sent < buflen) {
977 : /* TODO if send buffer is full we block receive !!! */
978 55200 : len = tds_select(tds, TDSSELWRITE, tds->query_timeout);
979 :
980 55200 : if (len > 0) {
981 55192 : len = tds_socket_write(tds->conn, tds, buffer + sent, buflen - sent);
982 55192 : if (len == 0)
983 0 : continue;
984 55192 : if (len < 0)
985 : return len;
986 :
987 55158 : sent += len;
988 55158 : continue;
989 : }
990 :
991 : /* error */
992 8 : if (len < 0) {
993 8 : int err = sock_errno;
994 : char *errstr;
995 :
996 8 : if (TDSSOCK_WOULDBLOCK(err)) /* shouldn't happen, but OK, retry */
997 0 : continue;
998 8 : errstr = sock_strerror(err);
999 8 : tdsdump_log(TDS_DBG_NETWORK, "select(2) failed: %d (%s)\n", err, errstr);
1000 : sock_strerror_free(errstr);
1001 8 : tds_connection_close(tds->conn);
1002 8 : tdserror(tds_get_ctx(tds), tds, TDSEWRIT, err);
1003 8 : return -1;
1004 : }
1005 :
1006 : /* timeout */
1007 0 : tdsdump_log(TDS_DBG_NETWORK, "tds_goodwrite(): timed out, asking client\n");
1008 0 : switch (tdserror(tds_get_ctx(tds), tds, TDSETIME, sock_errno)) {
1009 : case TDS_INT_CONTINUE:
1010 : break;
1011 0 : default:
1012 : case TDS_INT_CANCEL:
1013 0 : tds_close_socket(tds);
1014 0 : return -1;
1015 : }
1016 : }
1017 :
1018 46400 : return (int) sent;
1019 : }
1020 :
1021 : void
1022 103474 : tds_socket_flush(TDS_SYS_SOCKET sock TDS_UNUSED)
1023 : {
1024 : #ifdef USE_CORK
1025 : int opt;
1026 103474 : opt = 0;
1027 103474 : setsockopt(sock, SOL_TCP, TCP_CORK, (const void *) &opt, sizeof(opt));
1028 103474 : opt = 1;
1029 103474 : setsockopt(sock, SOL_TCP, TCP_CORK, (const void *) &opt, sizeof(opt));
1030 : #endif
1031 103474 : }
1032 :
1033 : int
1034 79415 : tds_connection_write(TDSSOCKET *tds, const unsigned char *buf, int buflen, int final)
1035 : {
1036 : int sent;
1037 79415 : TDSCONNECTION *conn = tds->conn;
1038 :
1039 : #if !defined(_WIN32) && !defined(MSG_NOSIGNAL) && !defined(DOS32X) && !defined(SO_NOSIGPIPE)
1040 : void (*oldsig) (int);
1041 :
1042 : oldsig = signal(SIGPIPE, SIG_IGN);
1043 : if (oldsig == SIG_ERR) {
1044 : tdsdump_log(TDS_DBG_WARN, "TDS: Warning: Couldn't set SIGPIPE signal to be ignored\n");
1045 : }
1046 : #endif
1047 :
1048 79415 : if (conn->tls_session)
1049 18635 : sent = tds_ssl_write(conn, buf, buflen);
1050 : else
1051 : #if ENABLE_ODBC_MARS
1052 32973 : sent = tds_socket_write(conn, tds, buf, buflen);
1053 : #else
1054 27807 : sent = tds_goodwrite(tds, buf, buflen);
1055 : #endif
1056 :
1057 : /* force packet flush */
1058 79415 : if (final && sent >= buflen)
1059 71255 : tds_socket_flush(tds_get_s(tds));
1060 :
1061 : #if !defined(_WIN32) && !defined(MSG_NOSIGNAL) && !defined(DOS32X) && !defined(SO_NOSIGPIPE)
1062 : if (signal(SIGPIPE, oldsig) == SIG_ERR) {
1063 : tdsdump_log(TDS_DBG_WARN, "TDS: Warning: Couldn't reset SIGPIPE signal to previous value\n");
1064 : }
1065 : #endif
1066 79415 : return sent;
1067 : }
1068 :
1069 : /**
1070 : * Get port of all instances
1071 : * @return default port number or 0 if error
1072 : * @remark experimental, cf. MC-SQLR.pdf.
1073 : */
1074 : int
1075 0 : tds7_get_instance_ports(FILE *output, struct addrinfo *addr)
1076 : {
1077 : int num_try;
1078 : struct pollfd fd;
1079 : int retval;
1080 : TDS_SYS_SOCKET s;
1081 : char msg[16*1024];
1082 0 : int msg_len = 0;
1083 0 : int port = 0;
1084 : char ipaddr[128];
1085 :
1086 :
1087 0 : tds_addrinfo_set_port(addr, 1434);
1088 0 : tds_addrinfo2str(addr, ipaddr, sizeof(ipaddr));
1089 :
1090 0 : tdsdump_log(TDS_DBG_ERROR, "tds7_get_instance_ports(%s)\n", ipaddr);
1091 :
1092 : /* create an UDP socket */
1093 0 : if (TDS_IS_SOCKET_INVALID(s = socket(addr->ai_family, SOCK_DGRAM, 0))) {
1094 0 : char *errstr = sock_strerror(sock_errno);
1095 0 : tdsdump_log(TDS_DBG_ERROR, "socket creation error: %s\n", errstr);
1096 : sock_strerror_free(errstr);
1097 : return 0;
1098 : }
1099 :
1100 : /*
1101 : * on cluster environment is possible that reply packet came from
1102 : * different IP so do not filter by ip with connect
1103 : */
1104 :
1105 0 : if (tds_socket_set_nonblocking(s) != 0) {
1106 0 : CLOSESOCKET(s);
1107 0 : return 0;
1108 : }
1109 :
1110 : /*
1111 : * Request the instance's port from the server.
1112 : * There is no easy way to detect if port is closed so we always try to
1113 : * get a reply from server 16 times.
1114 : */
1115 0 : for (num_try = 0; num_try < 16 && msg_len == 0; ++num_try) {
1116 : /* send the request */
1117 0 : msg[0] = 3;
1118 0 : if (sendto(s, msg, 1, 0, addr->ai_addr, addr->ai_addrlen) < 0)
1119 : break;
1120 :
1121 0 : fd.fd = s;
1122 0 : fd.events = POLLIN;
1123 0 : fd.revents = 0;
1124 :
1125 0 : retval = poll(&fd, 1, 1000);
1126 :
1127 : /* on interrupt ignore */
1128 0 : if (retval < 0 && sock_errno == TDSSOCK_EINTR)
1129 0 : continue;
1130 :
1131 0 : if (retval == 0) { /* timed out */
1132 : #if 1
1133 0 : tdsdump_log(TDS_DBG_ERROR, "tds7_get_instance_port: timed out on try %d of 16\n", num_try);
1134 0 : continue;
1135 : #else
1136 : int rc;
1137 : tdsdump_log(TDS_DBG_INFO1, "timed out\n");
1138 :
1139 : switch(rc = tdserror(NULL, NULL, TDSETIME, 0)) {
1140 : case TDS_INT_CONTINUE:
1141 : continue; /* try again */
1142 :
1143 : default:
1144 : tdsdump_log(TDS_DBG_ERROR, "error: client error handler returned %d\n", rc);
1145 : case TDS_INT_CANCEL:
1146 : CLOSESOCKET(s);
1147 : return 0;
1148 : }
1149 : #endif
1150 : }
1151 0 : if (retval < 0)
1152 : break;
1153 :
1154 : /* got data, read and parse */
1155 0 : if ((msg_len = recv(s, msg, sizeof(msg) - 1, 0)) > 3 && msg[0] == 5) {
1156 0 : char *name, sep[2] = ";", *save;
1157 :
1158 : /* assure null terminated */
1159 0 : msg[msg_len] = 0;
1160 0 : tdsdump_dump_buf(TDS_DBG_INFO1, "instance info", msg, msg_len);
1161 :
1162 : if (0) { /* To debug, print the whole string. */
1163 : char *p;
1164 :
1165 : for (*sep = '\n', p=msg+3; p < msg + msg_len; p++) {
1166 : if( *p == ';' )
1167 : *p = *sep;
1168 : }
1169 : fputs(msg + 3, output);
1170 : }
1171 :
1172 : /*
1173 : * Parse and print message.
1174 : */
1175 0 : name = strtok_r(msg+3, sep, &save);
1176 0 : while (name && output) {
1177 : int i;
1178 : static const char *const names[] = { "ServerName", "InstanceName", "IsClustered", "Version",
1179 : "tcp", "np", "via" };
1180 :
1181 0 : for (i=0; name && i < TDS_VECTOR_SIZE(names); i++) {
1182 0 : const char *value = strtok_r(NULL, sep, &save);
1183 :
1184 0 : if (strcmp(name, names[i]) != 0)
1185 0 : fprintf(output, "error: expecting '%s', found '%s'\n", names[i], name);
1186 0 : if (value)
1187 0 : fprintf(output, "%15s %s\n", name, value);
1188 : else
1189 : break;
1190 :
1191 0 : name = strtok_r(NULL, sep, &save);
1192 :
1193 0 : if (name && strcmp(name, names[0]) == 0)
1194 : break;
1195 : }
1196 0 : if (name)
1197 0 : fprintf(output, "\n");
1198 : }
1199 : }
1200 : }
1201 0 : CLOSESOCKET(s);
1202 0 : tdsdump_log(TDS_DBG_ERROR, "default instance port is %d\n", port);
1203 : return port;
1204 : }
1205 :
1206 : /**
1207 : * Get port of given instance
1208 : * @return port number or 0 if error
1209 : */
1210 : int
1211 2 : tds7_get_instance_port(struct addrinfo *addr, const char *instance)
1212 : {
1213 : int num_try;
1214 : struct pollfd fd;
1215 : int retval;
1216 : TDS_SYS_SOCKET s;
1217 : char msg[1024];
1218 : int msg_len;
1219 2 : int port = 0;
1220 : char ipaddr[128];
1221 :
1222 2 : tds_addrinfo_set_port(addr, 1434);
1223 2 : tds_addrinfo2str(addr, ipaddr, sizeof(ipaddr));
1224 :
1225 2 : tdsdump_log(TDS_DBG_ERROR, "tds7_get_instance_port(%s, %s)\n", ipaddr, instance);
1226 :
1227 : /* create an UDP socket */
1228 2 : if (TDS_IS_SOCKET_INVALID(s = socket(addr->ai_family, SOCK_DGRAM, 0))) {
1229 0 : char *errstr = sock_strerror(sock_errno);
1230 0 : tdsdump_log(TDS_DBG_ERROR, "socket creation error: %s\n", errstr);
1231 : sock_strerror_free(errstr);
1232 : return 0;
1233 : }
1234 :
1235 : /*
1236 : * on cluster environment is possible that reply packet came from
1237 : * different IP so do not filter by ip with connect
1238 : */
1239 :
1240 2 : if (tds_socket_set_nonblocking(s) != 0) {
1241 0 : CLOSESOCKET(s);
1242 0 : return 0;
1243 : }
1244 :
1245 : /*
1246 : * Request the instance's port from the server.
1247 : * There is no easy way to detect if port is closed so we always try to
1248 : * get a reply from server 16 times.
1249 : */
1250 0 : for (num_try = 0; num_try < 16; ++num_try) {
1251 : /* send the request */
1252 2 : msg[0] = 4;
1253 2 : strlcpy(msg + 1, instance, sizeof(msg) - 1);
1254 2 : if (sendto(s, msg, (int)strlen(msg) + 1, 0, addr->ai_addr, addr->ai_addrlen) < 0)
1255 : break;
1256 :
1257 2 : fd.fd = s;
1258 2 : fd.events = POLLIN;
1259 2 : fd.revents = 0;
1260 :
1261 2 : retval = poll(&fd, 1, 1000);
1262 :
1263 : /* on interrupt ignore */
1264 2 : if (retval < 0 && sock_errno == TDSSOCK_EINTR)
1265 0 : continue;
1266 :
1267 2 : if (retval == 0) { /* timed out */
1268 : #if 1
1269 0 : tdsdump_log(TDS_DBG_ERROR, "tds7_get_instance_port: timed out on try %d of 16\n", num_try);
1270 0 : continue;
1271 : #else
1272 : int rc;
1273 : tdsdump_log(TDS_DBG_INFO1, "timed out\n");
1274 :
1275 : switch(rc = tdserror(NULL, NULL, TDSETIME, 0)) {
1276 : case TDS_INT_CONTINUE:
1277 : continue; /* try again */
1278 :
1279 : default:
1280 : tdsdump_log(TDS_DBG_ERROR, "error: client error handler returned %d\n", rc);
1281 : case TDS_INT_CANCEL:
1282 : CLOSESOCKET(s);
1283 : return 0;
1284 : }
1285 : #endif
1286 : }
1287 2 : if (retval < 0)
1288 : break;
1289 :
1290 : /* TODO pass also connection and set instance/servername ?? */
1291 :
1292 : /* got data, read and parse */
1293 2 : if ((msg_len = recv(s, msg, sizeof(msg) - 1, 0)) > 3 && msg[0] == 5) {
1294 : char *p;
1295 2 : long l = 0;
1296 2 : int instance_ok = 0, port_ok = 0;
1297 :
1298 : /* assure null terminated */
1299 2 : msg[msg_len] = 0;
1300 2 : tdsdump_dump_buf(TDS_DBG_INFO1, "instance info", msg, msg_len);
1301 :
1302 : /*
1303 : * Parse message and check instance name and port.
1304 : * We don't check servername cause it can be very different from the client's.
1305 : */
1306 2 : for (p = msg + 3;;) {
1307 : char *name, *value;
1308 :
1309 12 : name = p;
1310 12 : p = strchr(p, ';');
1311 12 : if (!p)
1312 : break;
1313 10 : *p++ = 0;
1314 :
1315 10 : value = name;
1316 10 : if (*name) {
1317 10 : value = p;
1318 10 : p = strchr(p, ';');
1319 10 : if (!p)
1320 : break;
1321 10 : *p++ = 0;
1322 : }
1323 :
1324 10 : if (strcasecmp(name, "InstanceName") == 0) {
1325 2 : if (strcasecmp(value, instance) != 0)
1326 : break;
1327 : instance_ok = 1;
1328 8 : } else if (strcasecmp(name, "tcp") == 0) {
1329 2 : l = strtol(value, &p, 10);
1330 2 : if (l > 0 && l <= 0xffff && *p == 0)
1331 2 : port_ok = 1;
1332 : }
1333 : }
1334 2 : if (port_ok && instance_ok) {
1335 2 : port = l;
1336 2 : break;
1337 : }
1338 : }
1339 : }
1340 2 : CLOSESOCKET(s);
1341 2 : tdsdump_log(TDS_DBG_ERROR, "instance port is %d\n", port);
1342 : return port;
1343 : }
1344 :
1345 : #if defined(_WIN32)
1346 : static const char tds_unknown_wsaerror[] = "undocumented WSA error code";
1347 :
1348 : char *
1349 : tds_prwsaerror(int erc)
1350 : {
1351 : char *errstr = NULL;
1352 : FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER|FORMAT_MESSAGE_FROM_SYSTEM, NULL, erc,
1353 : MAKELANGID(LANG_NEUTRAL,SUBLANG_DEFAULT), (LPTSTR)&errstr, 0, NULL);
1354 : if (errstr) {
1355 : size_t len = strlen(errstr);
1356 : while (len > 0 && (errstr[len-1] == '\r' || errstr[len-1] == '\n'))
1357 : errstr[len-1] = 0;
1358 : return errstr;
1359 : }
1360 : return (char*) tds_unknown_wsaerror;
1361 : }
1362 :
1363 : void
1364 : tds_prwsaerror_free(char *s)
1365 : {
1366 : if (s != tds_unknown_wsaerror)
1367 : LocalFree((HLOCAL) s);
1368 : }
1369 : #endif
1370 :
1371 : /** @} */
1372 :
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