4 * Copyright (c) 2004 Maksim Yevmenkin <m_evmenkin@yahoo.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * $Id: server.c,v 1.6 2004/01/13 01:54:39 max Exp $
32 #include <sys/param.h>
33 #include <sys/select.h>
35 #include <sys/queue.h>
36 #include <sys/ucred.h>
38 #include <netinet/in.h>
39 #include <arpa/inet.h>
41 #define L2CAP_SOCKET_CHECKED
42 #include <bluetooth.h>
55 static void server_accept_client (server_p srv, int32_t fd);
56 static int32_t server_process_request (server_p srv, int32_t fd);
57 static int32_t server_send_error_response (server_p srv, int32_t fd,
59 static void server_close_fd (server_p srv, int32_t fd);
66 server_init(server_p srv, char const *control)
68 struct sockaddr_un un;
69 struct sockaddr_l2cap l2;
70 int32_t unsock, l2sock;
75 assert(control != NULL);
77 memset(srv, 0, sizeof(*srv));
79 /* Open control socket */
80 if (unlink(control) < 0 && errno != ENOENT) {
81 log_crit("Could not unlink(%s). %s (%d)",
82 control, strerror(errno), errno);
86 unsock = socket(PF_LOCAL, SOCK_STREAM, 0);
88 log_crit("Could not create control socket. %s (%d)",
89 strerror(errno), errno);
93 memset(&un, 0, sizeof(un));
94 un.sun_len = sizeof(un);
95 un.sun_family = AF_LOCAL;
96 strlcpy(un.sun_path, control, sizeof(un.sun_path));
98 if (bind(unsock, (struct sockaddr *) &un, sizeof(un)) < 0) {
99 log_crit("Could not bind control socket. %s (%d)",
100 strerror(errno), errno);
105 if (chmod(control, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH) < 0) {
106 log_crit("Could not change permissions on control socket. " \
107 "%s (%d)", strerror(errno), errno);
112 if (listen(unsock, 10) < 0) {
113 log_crit("Could not listen on control socket. %s (%d)",
114 strerror(errno), errno);
119 /* Open L2CAP socket */
120 l2sock = socket(PF_BLUETOOTH, SOCK_SEQPACKET, BLUETOOTH_PROTO_L2CAP);
122 log_crit("Could not create L2CAP socket. %s (%d)",
123 strerror(errno), errno);
129 if (getsockopt(l2sock, SOL_L2CAP, SO_L2CAP_IMTU, &imtu, &size) < 0) {
130 log_crit("Could not get L2CAP IMTU. %s (%d)",
131 strerror(errno), errno);
137 memset(&l2, 0, sizeof(l2));
138 l2.l2cap_len = sizeof(l2);
139 l2.l2cap_family = AF_BLUETOOTH;
140 memcpy(&l2.l2cap_bdaddr, NG_HCI_BDADDR_ANY, sizeof(l2.l2cap_bdaddr));
141 l2.l2cap_psm = htole16(NG_L2CAP_PSM_SDP);
143 if (bind(l2sock, (struct sockaddr *) &l2, sizeof(l2)) < 0) {
144 log_crit("Could not bind L2CAP socket. %s (%d)",
145 strerror(errno), errno);
151 if (listen(l2sock, 10) < 0) {
152 log_crit("Could not listen on L2CAP socket. %s (%d)",
153 strerror(errno), errno);
159 /* Allocate incoming buffer */
160 srv->imtu = (imtu > SDP_LOCAL_MTU)? imtu : SDP_LOCAL_MTU;
161 srv->req = (uint8_t *) calloc(srv->imtu, sizeof(srv->req[0]));
162 if (srv->req == NULL) {
163 log_crit("Could not allocate request buffer");
169 /* Allocate memory for descriptor index */
170 srv->fdidx = (fd_idx_p) calloc(FD_SETSIZE, sizeof(srv->fdidx[0]));
171 if (srv->fdidx == NULL) {
172 log_crit("Could not allocate fd index");
179 /* Register Service Discovery profile (attach it to control socket) */
180 if (provider_register_sd(unsock) < 0) {
181 log_crit("Could not register Service Discovery profile");
190 * If we got here then everything is fine. Add both control sockets
194 FD_ZERO(&srv->fdset);
195 srv->maxfd = (unsock > l2sock)? unsock : l2sock;
197 FD_SET(unsock, &srv->fdset);
198 srv->fdidx[unsock].valid = 1;
199 srv->fdidx[unsock].server = 1;
200 srv->fdidx[unsock].control = 1;
201 srv->fdidx[unsock].priv = 0;
202 srv->fdidx[unsock].rsp_cs = 0;
203 srv->fdidx[unsock].rsp_size = 0;
204 srv->fdidx[unsock].rsp_limit = 0;
205 srv->fdidx[unsock].omtu = SDP_LOCAL_MTU;
206 srv->fdidx[unsock].rsp = NULL;
208 FD_SET(l2sock, &srv->fdset);
209 srv->fdidx[l2sock].valid = 1;
210 srv->fdidx[l2sock].server = 1;
211 srv->fdidx[l2sock].control = 0;
212 srv->fdidx[l2sock].priv = 0;
213 srv->fdidx[l2sock].rsp_cs = 0;
214 srv->fdidx[l2sock].rsp_size = 0;
215 srv->fdidx[l2sock].rsp_limit = 0;
216 srv->fdidx[l2sock].omtu = 0; /* unknown */
217 srv->fdidx[l2sock].rsp = NULL;
227 server_shutdown(server_p srv)
233 for (fd = 0; fd < srv->maxfd + 1; fd ++)
234 if (srv->fdidx[fd].valid)
235 server_close_fd(srv, fd);
240 memset(srv, 0, sizeof(*srv));
244 * Do one server iteration
248 server_do(server_p srv)
255 /* Copy cached version of the fd set and call select */
256 memcpy(&fdset, &srv->fdset, sizeof(fdset));
257 n = select(srv->maxfd + 1, &fdset, NULL, NULL, NULL);
262 log_err("Could not select(%d, %p). %s (%d)",
263 srv->maxfd + 1, &fdset, strerror(errno), errno);
268 /* Process descriptors */
269 for (fd = 0; fd < srv->maxfd + 1 && n > 0; fd ++) {
270 if (!FD_ISSET(fd, &fdset))
273 assert(srv->fdidx[fd].valid);
276 if (srv->fdidx[fd].server)
277 server_accept_client(srv, fd);
278 else if (server_process_request(srv, fd) != 0)
279 server_close_fd(srv, fd);
287 * Accept new client connection and register it with index
291 server_accept_client(server_p srv, int32_t fd)
299 cfd = accept(fd, NULL, NULL);
300 } while (cfd < 0 && errno == EINTR);
303 log_err("Could not accept connection on %s socket. %s (%d)",
304 srv->fdidx[fd].control? "control" : "L2CAP",
305 strerror(errno), errno);
309 assert(!FD_ISSET(cfd, &srv->fdset));
310 assert(!srv->fdidx[cfd].valid);
314 if (!srv->fdidx[fd].control) {
315 /* Get local BD_ADDR */
316 size = sizeof(srv->req_sa);
317 if (getsockname(cfd,(struct sockaddr*)&srv->req_sa,&size) < 0) {
318 log_err("Could not get local BD_ADDR. %s (%d)",
319 strerror(errno), errno);
324 /* Get outgoing MTU */
326 if (getsockopt(cfd,SOL_L2CAP,SO_L2CAP_OMTU,&omtu,&size) < 0) {
327 log_err("Could not get L2CAP OMTU. %s (%d)",
328 strerror(errno), errno);
334 * The maximum size of the L2CAP packet is 65536 bytes.
335 * The minimum L2CAP MTU is 43 bytes. That means we need
336 * 65536 / 43 = ~1524 chunks to transfer maximum packet
337 * size with minimum MTU. The "rsp_cs" field in fd_idx_t
338 * is 11 bits wide, which gives us up to 2048 chunks.
341 if (omtu < NG_L2CAP_MTU_MINIMUM) {
342 log_err("L2CAP OMTU is too small (%d bytes)", omtu);
350 /* Get peer's credentials */
351 memset(&cr, 0, sizeof(cr));
354 if (getsockopt(cfd, 0, LOCAL_PEERCRED, &cr, &size) < 0) {
355 log_err("Could not get peer's credentials. %s (%d)",
356 strerror(errno), errno);
361 /* Check credentials */
362 pw = getpwuid(cr.cr_uid);
364 priv = (strcmp(pw->pw_name, "root") == 0);
366 log_warning("Could not verify credentials for uid %d",
369 memcpy(&srv->req_sa.l2cap_bdaddr, NG_HCI_BDADDR_ANY,
370 sizeof(srv->req_sa.l2cap_bdaddr));
372 omtu = srv->fdidx[fd].omtu;
376 * Allocate buffer. This is an overkill, but we can not know how
377 * big our reply is going to be.
380 rsp = (uint8_t *) calloc(NG_L2CAP_MTU_MAXIMUM, sizeof(rsp[0]));
382 log_crit("Could not allocate response buffer");
387 /* Add client descriptor to the index */
388 FD_SET(cfd, &srv->fdset);
389 if (srv->maxfd < cfd)
391 srv->fdidx[cfd].valid = 1;
392 srv->fdidx[cfd].server = 0;
393 srv->fdidx[cfd].control = srv->fdidx[fd].control;
394 srv->fdidx[cfd].priv = priv;
395 srv->fdidx[cfd].rsp_cs = 0;
396 srv->fdidx[cfd].rsp_size = 0;
397 srv->fdidx[cfd].rsp_limit = 0;
398 srv->fdidx[cfd].omtu = omtu;
399 srv->fdidx[cfd].rsp = rsp;
403 * Process request from the client
407 server_process_request(server_p srv, int32_t fd)
409 sdp_pdu_p pdu = (sdp_pdu_p) srv->req;
412 assert(srv->imtu > 0);
413 assert(srv->req != NULL);
414 assert(FD_ISSET(fd, &srv->fdset));
415 assert(srv->fdidx[fd].valid);
416 assert(!srv->fdidx[fd].server);
417 assert(srv->fdidx[fd].rsp != NULL);
418 assert(srv->fdidx[fd].omtu >= NG_L2CAP_MTU_MINIMUM);
421 len = read(fd, srv->req, srv->imtu);
422 } while (len < 0 && errno == EINTR);
425 log_err("Could not receive SDP request from %s socket. %s (%d)",
426 srv->fdidx[fd].control? "control" : "L2CAP",
427 strerror(errno), errno);
431 log_info("Client on %s socket has disconnected",
432 srv->fdidx[fd].control? "control" : "L2CAP");
436 if (len >= sizeof(*pdu) &&
437 sizeof(*pdu) + (pdu->len = ntohs(pdu->len)) == len) {
439 case SDP_PDU_SERVICE_SEARCH_REQUEST:
440 error = server_prepare_service_search_response(srv, fd);
443 case SDP_PDU_SERVICE_ATTRIBUTE_REQUEST:
444 error = server_prepare_service_attribute_response(srv, fd);
447 case SDP_PDU_SERVICE_SEARCH_ATTRIBUTE_REQUEST:
448 error = server_prepare_service_search_attribute_response(srv, fd);
451 case SDP_PDU_SERVICE_REGISTER_REQUEST:
452 error = server_prepare_service_register_response(srv, fd);
455 case SDP_PDU_SERVICE_UNREGISTER_REQUEST:
456 error = server_prepare_service_unregister_response(srv, fd);
459 case SDP_PDU_SERVICE_CHANGE_REQUEST:
460 error = server_prepare_service_change_response(srv, fd);
464 error = SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX;
468 error = SDP_ERROR_CODE_INVALID_PDU_SIZE;
472 case SDP_PDU_SERVICE_SEARCH_REQUEST:
473 error = server_send_service_search_response(srv, fd);
476 case SDP_PDU_SERVICE_ATTRIBUTE_REQUEST:
477 error = server_send_service_attribute_response(srv, fd);
480 case SDP_PDU_SERVICE_SEARCH_ATTRIBUTE_REQUEST:
481 error = server_send_service_search_attribute_response(srv, fd);
484 case SDP_PDU_SERVICE_REGISTER_REQUEST:
485 error = server_send_service_register_response(srv, fd);
488 case SDP_PDU_SERVICE_UNREGISTER_REQUEST:
489 error = server_send_service_unregister_response(srv, fd);
492 case SDP_PDU_SERVICE_CHANGE_REQUEST:
493 error = server_send_service_change_response(srv, fd);
497 error = SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX;
502 log_err("Could not send SDP response to %s socket, " \
503 "pdu->pid=%d, pdu->tid=%d, error=%d",
504 srv->fdidx[fd].control? "control" : "L2CAP",
505 pdu->pid, ntohs(pdu->tid), error);
507 log_err("Could not process SDP request from %s socket, " \
508 "pdu->pid=%d, pdu->tid=%d, pdu->len=%d, len=%d, " \
510 srv->fdidx[fd].control? "control" : "L2CAP",
511 pdu->pid, ntohs(pdu->tid), pdu->len, len, error);
513 error = server_send_error_response(srv, fd, error);
515 log_err("Could not send SDP error response to %s " \
516 "socket, pdu->pid=%d, pdu->tid=%d, error=%d",
517 srv->fdidx[fd].control? "control" : "L2CAP",
518 pdu->pid, ntohs(pdu->tid), error);
521 /* On error forget response (if any) */
523 srv->fdidx[fd].rsp_cs = 0;
524 srv->fdidx[fd].rsp_size = 0;
525 srv->fdidx[fd].rsp_limit = 0;
532 * Send SDP_Error_Response PDU
536 server_send_error_response(server_p srv, int32_t fd, uint16_t error)
543 } __attribute__ ((packed)) rsp;
545 /* Prepare and send SDP error response */
546 rsp.pdu.pid = SDP_PDU_ERROR_RESPONSE;
547 rsp.pdu.tid = ((sdp_pdu_p)(srv->req))->tid;
548 rsp.pdu.len = htons(sizeof(rsp.error));
549 rsp.error = htons(error);
552 size = write(fd, &rsp, sizeof(rsp));
553 } while (size < 0 && errno == EINTR);
555 return ((size < 0)? errno : 0);
559 * Close descriptor and remove it from index
563 server_close_fd(server_p srv, int32_t fd)
565 provider_p provider = NULL, provider_next = NULL;
567 assert(FD_ISSET(fd, &srv->fdset));
568 assert(srv->fdidx[fd].valid);
572 FD_CLR(fd, &srv->fdset);
573 if (fd == srv->maxfd)
576 if (srv->fdidx[fd].rsp != NULL)
577 free(srv->fdidx[fd].rsp);
579 memset(&srv->fdidx[fd], 0, sizeof(srv->fdidx[fd]));
581 for (provider = provider_get_first();
583 provider = provider_next) {
584 provider_next = provider_get_next(provider);
586 if (provider->fd == fd)
587 provider_unregister(provider);