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 #include <bluetooth.h>
54 static void server_accept_client (server_p srv, int32_t fd);
55 static int32_t server_process_request (server_p srv, int32_t fd);
56 static int32_t server_send_error_response (server_p srv, int32_t fd,
58 static void server_close_fd (server_p srv, int32_t fd);
65 server_init(server_p srv, char const *control)
67 struct sockaddr_un un;
68 struct sockaddr_l2cap l2;
69 int32_t unsock, l2sock;
74 assert(control != NULL);
76 memset(srv, 0, sizeof(srv));
78 /* Open control socket */
79 if (unlink(control) < 0 && errno != ENOENT) {
80 log_crit("Could not unlink(%s). %s (%d)",
81 control, strerror(errno), errno);
85 unsock = socket(PF_LOCAL, SOCK_STREAM, 0);
87 log_crit("Could not create control socket. %s (%d)",
88 strerror(errno), errno);
92 memset(&un, 0, sizeof(un));
93 un.sun_len = sizeof(un);
94 un.sun_family = AF_LOCAL;
95 strlcpy(un.sun_path, control, sizeof(un.sun_path));
97 if (bind(unsock, (struct sockaddr *) &un, sizeof(un)) < 0) {
98 log_crit("Could not bind control socket. %s (%d)",
99 strerror(errno), errno);
104 if (chmod(control, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH) < 0) {
105 log_crit("Could not change permissions on control socket. " \
106 "%s (%d)", strerror(errno), errno);
111 if (listen(unsock, 10) < 0) {
112 log_crit("Could not listen on control socket. %s (%d)",
113 strerror(errno), errno);
118 /* Open L2CAP socket */
119 l2sock = socket(PF_BLUETOOTH, SOCK_SEQPACKET, BLUETOOTH_PROTO_L2CAP);
121 log_crit("Could not create L2CAP socket. %s (%d)",
122 strerror(errno), errno);
128 if (getsockopt(l2sock, SOL_L2CAP, SO_L2CAP_IMTU, &imtu, &size) < 0) {
129 log_crit("Could not get L2CAP IMTU. %s (%d)",
130 strerror(errno), errno);
136 memset(&l2, 0, sizeof(l2));
137 l2.l2cap_len = sizeof(l2);
138 l2.l2cap_family = AF_BLUETOOTH;
139 memcpy(&l2.l2cap_bdaddr, NG_HCI_BDADDR_ANY, sizeof(l2.l2cap_bdaddr));
140 l2.l2cap_psm = htole16(NG_L2CAP_PSM_SDP);
142 if (bind(l2sock, (struct sockaddr *) &l2, sizeof(l2)) < 0) {
143 log_crit("Could not bind L2CAP socket. %s (%d)",
144 strerror(errno), errno);
150 if (listen(l2sock, 10) < 0) {
151 log_crit("Could not listen on L2CAP socket. %s (%d)",
152 strerror(errno), errno);
158 /* Allocate incoming buffer */
159 srv->imtu = (imtu > SDP_LOCAL_MTU)? imtu : SDP_LOCAL_MTU;
160 srv->req = (uint8_t *) calloc(srv->imtu, sizeof(srv->req[0]));
161 if (srv->req == NULL) {
162 log_crit("Could not allocate request buffer");
168 /* Allocate memory for descriptor index */
169 srv->fdidx = (fd_idx_p) calloc(FD_SETSIZE, sizeof(srv->fdidx[0]));
170 if (srv->fdidx == NULL) {
171 log_crit("Could not allocate fd index");
178 /* Register Service Discovery profile (attach it to control socket) */
179 if (provider_register_sd(unsock) < 0) {
180 log_crit("Could not register Service Discovery profile");
189 * If we got here then everything is fine. Add both control sockets
193 FD_ZERO(&srv->fdset);
194 srv->maxfd = (unsock > l2sock)? unsock : l2sock;
196 FD_SET(unsock, &srv->fdset);
197 srv->fdidx[unsock].valid = 1;
198 srv->fdidx[unsock].server = 1;
199 srv->fdidx[unsock].control = 1;
200 srv->fdidx[unsock].priv = 0;
201 srv->fdidx[unsock].rsp_cs = 0;
202 srv->fdidx[unsock].rsp_size = 0;
203 srv->fdidx[unsock].rsp_limit = 0;
204 srv->fdidx[unsock].omtu = SDP_LOCAL_MTU;
205 srv->fdidx[unsock].rsp = NULL;
207 FD_SET(l2sock, &srv->fdset);
208 srv->fdidx[l2sock].valid = 1;
209 srv->fdidx[l2sock].server = 1;
210 srv->fdidx[l2sock].control = 0;
211 srv->fdidx[l2sock].priv = 0;
212 srv->fdidx[l2sock].rsp_cs = 0;
213 srv->fdidx[l2sock].rsp_size = 0;
214 srv->fdidx[l2sock].rsp_limit = 0;
215 srv->fdidx[l2sock].omtu = 0; /* unknown */
216 srv->fdidx[l2sock].rsp = NULL;
226 server_shutdown(server_p srv)
232 for (fd = 0; fd < srv->maxfd + 1; fd ++)
233 if (srv->fdidx[fd].valid)
234 server_close_fd(srv, fd);
239 memset(srv, 0, sizeof(*srv));
243 * Do one server iteration
247 server_do(server_p srv)
254 /* Copy cached version of the fd set and call select */
255 memcpy(&fdset, &srv->fdset, sizeof(fdset));
256 n = select(srv->maxfd + 1, &fdset, NULL, NULL, NULL);
261 log_err("Could not select(%d, %p). %s (%d)",
262 srv->maxfd + 1, &fdset, strerror(errno), errno);
267 /* Process descriptors */
268 for (fd = 0; fd < srv->maxfd + 1 && n > 0; fd ++) {
269 if (!FD_ISSET(fd, &fdset))
272 assert(srv->fdidx[fd].valid);
275 if (srv->fdidx[fd].server)
276 server_accept_client(srv, fd);
277 else if (server_process_request(srv, fd) != 0)
278 server_close_fd(srv, fd);
286 * Accept new client connection and register it with index
290 server_accept_client(server_p srv, int32_t fd)
298 cfd = accept(fd, NULL, NULL);
299 } while (cfd < 0 && errno == EINTR);
302 log_err("Could not accept connection on %s socket. %s (%d)",
303 srv->fdidx[fd].control? "control" : "L2CAP",
304 strerror(errno), errno);
308 assert(!FD_ISSET(cfd, &srv->fdset));
309 assert(!srv->fdidx[cfd].valid);
313 if (!srv->fdidx[fd].control) {
314 /* Get local BD_ADDR */
315 size = sizeof(srv->req_sa);
316 if (getsockname(cfd,(struct sockaddr*)&srv->req_sa,&size) < 0) {
317 log_err("Could not get local BD_ADDR. %s (%d)",
318 strerror(errno), errno);
323 /* Get outgoing MTU */
325 if (getsockopt(cfd,SOL_L2CAP,SO_L2CAP_OMTU,&omtu,&size) < 0) {
326 log_err("Could not get L2CAP OMTU. %s (%d)",
327 strerror(errno), errno);
333 * The maximum size of the L2CAP packet is 65536 bytes.
334 * The minimum L2CAP MTU is 43 bytes. That means we need
335 * 65536 / 43 = ~1524 chunks to transfer maximum packet
336 * size with minimum MTU. The "rsp_cs" field in fd_idx_t
337 * is 11 bit wide that gives us upto 2048 chunks.
340 if (omtu < NG_L2CAP_MTU_MINIMUM) {
341 log_err("L2CAP OMTU is too small (%d bytes)", omtu);
349 /* Get peer's credentials */
350 memset(&cr, 0, sizeof(cr));
353 if (getsockopt(cfd, 0, LOCAL_PEERCRED, &cr, &size) < 0) {
354 log_err("Could not get peer's credentials. %s (%d)",
355 strerror(errno), errno);
360 /* Check credentials */
361 pw = getpwuid(cr.cr_uid);
363 priv = (strcmp(pw->pw_name, "root") == 0);
365 log_warning("Could not verify credentials for uid %d",
368 memcpy(&srv->req_sa.l2cap_bdaddr, NG_HCI_BDADDR_ANY,
369 sizeof(srv->req_sa.l2cap_bdaddr));
371 omtu = srv->fdidx[fd].omtu;
375 * Allocate buffer. This is an overkill, but we can not know how
376 * big our reply is going to be.
379 rsp = (uint8_t *) calloc(NG_L2CAP_MTU_MAXIMUM, sizeof(rsp[0]));
381 log_crit("Could not allocate response buffer");
386 /* Add client descriptor to the index */
387 FD_SET(cfd, &srv->fdset);
388 if (srv->maxfd < cfd)
390 srv->fdidx[cfd].valid = 1;
391 srv->fdidx[cfd].server = 0;
392 srv->fdidx[cfd].control = srv->fdidx[fd].control;
393 srv->fdidx[cfd].priv = priv;
394 srv->fdidx[cfd].rsp_cs = 0;
395 srv->fdidx[cfd].rsp_size = 0;
396 srv->fdidx[cfd].rsp_limit = 0;
397 srv->fdidx[cfd].omtu = omtu;
398 srv->fdidx[cfd].rsp = rsp;
402 * Process request from the client
406 server_process_request(server_p srv, int32_t fd)
408 sdp_pdu_p pdu = (sdp_pdu_p) srv->req;
411 assert(srv->imtu > 0);
412 assert(srv->req != NULL);
413 assert(FD_ISSET(fd, &srv->fdset));
414 assert(srv->fdidx[fd].valid);
415 assert(!srv->fdidx[fd].server);
416 assert(srv->fdidx[fd].rsp != NULL);
417 assert(srv->fdidx[fd].omtu >= NG_L2CAP_MTU_MINIMUM);
420 len = read(fd, srv->req, srv->imtu);
421 } while (len < 0 && errno == EINTR);
424 log_err("Could not receive SDP request from %s socket. %s (%d)",
425 srv->fdidx[fd].control? "control" : "L2CAP",
426 strerror(errno), errno);
430 log_info("Client on %s socket has disconnected",
431 srv->fdidx[fd].control? "control" : "L2CAP");
435 if (len >= sizeof(*pdu) &&
436 sizeof(*pdu) + (pdu->len = ntohs(pdu->len)) == len) {
438 case SDP_PDU_SERVICE_SEARCH_REQUEST:
439 error = server_prepare_service_search_response(srv, fd);
442 case SDP_PDU_SERVICE_ATTRIBUTE_REQUEST:
443 error = server_prepare_service_attribute_response(srv, fd);
446 case SDP_PDU_SERVICE_SEARCH_ATTRIBUTE_REQUEST:
447 error = server_prepare_service_search_attribute_response(srv, fd);
450 case SDP_PDU_SERVICE_REGISTER_REQUEST:
451 error = server_prepare_service_register_response(srv, fd);
454 case SDP_PDU_SERVICE_UNREGISTER_REQUEST:
455 error = server_prepare_service_unregister_response(srv, fd);
458 case SDP_PDU_SERVICE_CHANGE_REQUEST:
459 error = server_prepare_service_change_response(srv, fd);
463 error = SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX;
467 error = SDP_ERROR_CODE_INVALID_PDU_SIZE;
471 case SDP_PDU_SERVICE_SEARCH_REQUEST:
472 error = server_send_service_search_response(srv, fd);
475 case SDP_PDU_SERVICE_ATTRIBUTE_REQUEST:
476 error = server_send_service_attribute_response(srv, fd);
479 case SDP_PDU_SERVICE_SEARCH_ATTRIBUTE_REQUEST:
480 error = server_send_service_search_attribute_response(srv, fd);
483 case SDP_PDU_SERVICE_REGISTER_REQUEST:
484 error = server_send_service_register_response(srv, fd);
487 case SDP_PDU_SERVICE_UNREGISTER_REQUEST:
488 error = server_send_service_unregister_response(srv, fd);
491 case SDP_PDU_SERVICE_CHANGE_REQUEST:
492 error = server_send_service_change_response(srv, fd);
496 error = SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX;
501 log_err("Could not send SDP response to %s socket, " \
502 "pdu->pid=%d, pdu->tid=%d, error=%d",
503 srv->fdidx[fd].control? "control" : "L2CAP",
504 pdu->pid, ntohs(pdu->tid), error);
506 log_err("Could not process SDP request from %s socket, " \
507 "pdu->pid=%d, pdu->tid=%d, pdu->len=%d, len=%d, " \
509 srv->fdidx[fd].control? "control" : "L2CAP",
510 pdu->pid, ntohs(pdu->tid), pdu->len, len, error);
512 error = server_send_error_response(srv, fd, error);
514 log_err("Could not send SDP error response to %s " \
515 "socket, pdu->pid=%d, pdu->tid=%d, error=%d",
516 srv->fdidx[fd].control? "control" : "L2CAP",
517 pdu->pid, ntohs(pdu->tid), error);
520 /* On error forget response (if any) */
522 srv->fdidx[fd].rsp_cs = 0;
523 srv->fdidx[fd].rsp_size = 0;
524 srv->fdidx[fd].rsp_limit = 0;
531 * Send SDP_Error_Response PDU
535 server_send_error_response(server_p srv, int32_t fd, uint16_t error)
542 } __attribute__ ((packed)) rsp;
544 /* Prepare and send SDP error response */
545 rsp.pdu.pid = SDP_PDU_ERROR_RESPONSE;
546 rsp.pdu.tid = ((sdp_pdu_p)(srv->req))->tid;
547 rsp.pdu.len = htons(sizeof(rsp.error));
548 rsp.error = htons(error);
551 size = write(fd, &rsp, sizeof(rsp));
552 } while (size < 0 && errno == EINTR);
554 return ((size < 0)? errno : 0);
558 * Close descriptor and remove it from index
562 server_close_fd(server_p srv, int32_t fd)
564 provider_p provider = NULL, provider_next = NULL;
566 assert(FD_ISSET(fd, &srv->fdset));
567 assert(srv->fdidx[fd].valid);
571 FD_CLR(fd, &srv->fdset);
572 if (fd == srv->maxfd)
575 if (srv->fdidx[fd].rsp != NULL)
576 free(srv->fdidx[fd].rsp);
578 memset(&srv->fdidx[fd], 0, sizeof(srv->fdidx[fd]));
580 for (provider = provider_get_first();
582 provider = provider_next) {
583 provider_next = provider_get_next(provider);
585 if (provider->fd == fd)
586 provider_unregister(provider);