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, size;
73 assert(control != NULL);
75 memset(srv, 0, sizeof(srv));
77 /* Open control socket */
78 if (unlink(control) < 0 && errno != ENOENT) {
79 log_crit("Could not unlink(%s). %s (%d)",
80 control, strerror(errno), errno);
84 unsock = socket(PF_LOCAL, SOCK_STREAM, 0);
86 log_crit("Could not create control socket. %s (%d)",
87 strerror(errno), errno);
91 memset(&un, 0, sizeof(un));
92 un.sun_len = sizeof(un);
93 un.sun_family = AF_LOCAL;
94 strlcpy(un.sun_path, control, sizeof(un.sun_path));
96 if (bind(unsock, (struct sockaddr *) &un, sizeof(un)) < 0) {
97 log_crit("Could not bind control socket. %s (%d)",
98 strerror(errno), errno);
103 if (chmod(control, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH) < 0) {
104 log_crit("Could not change permissions on control socket. " \
105 "%s (%d)", strerror(errno), errno);
110 if (listen(unsock, 10) < 0) {
111 log_crit("Could not listen on control socket. %s (%d)",
112 strerror(errno), errno);
117 /* Open L2CAP socket */
118 l2sock = socket(PF_BLUETOOTH, SOCK_SEQPACKET, BLUETOOTH_PROTO_L2CAP);
120 log_crit("Could not create L2CAP socket. %s (%d)",
121 strerror(errno), errno);
127 if (getsockopt(l2sock, SOL_L2CAP, SO_L2CAP_IMTU, &imtu, &size) < 0) {
128 log_crit("Could not get L2CAP IMTU. %s (%d)",
129 strerror(errno), errno);
135 memset(&l2, 0, sizeof(l2));
136 l2.l2cap_len = sizeof(l2);
137 l2.l2cap_family = AF_BLUETOOTH;
138 memcpy(&l2.l2cap_bdaddr, NG_HCI_BDADDR_ANY, sizeof(l2.l2cap_bdaddr));
139 l2.l2cap_psm = NG_L2CAP_PSM_SDP;
141 if (bind(l2sock, (struct sockaddr *) &l2, sizeof(l2)) < 0) {
142 log_crit("Could not bind L2CAP socket. %s (%d)",
143 strerror(errno), errno);
149 if (listen(l2sock, 10) < 0) {
150 log_crit("Could not listen on L2CAP socket. %s (%d)",
151 strerror(errno), errno);
157 /* Allocate incoming buffer */
158 srv->imtu = (imtu > SDP_LOCAL_MTU)? imtu : SDP_LOCAL_MTU;
159 srv->req = (uint8_t *) calloc(srv->imtu, sizeof(srv->req[0]));
160 if (srv->req == NULL) {
161 log_crit("Could not allocate request buffer");
167 /* Allocate memory for descriptor index */
168 srv->fdidx = (fd_idx_p) calloc(FD_SETSIZE, sizeof(srv->fdidx[0]));
169 if (srv->fdidx == NULL) {
170 log_crit("Could not allocate fd index");
177 /* Register Service Discovery profile (attach it to control socket) */
178 if (provider_register_sd(unsock) < 0) {
179 log_crit("Could not register Service Discovery profile");
188 * If we got here then everything is fine. Add both control sockets
192 FD_ZERO(&srv->fdset);
193 srv->maxfd = (unsock > l2sock)? unsock : l2sock;
195 FD_SET(unsock, &srv->fdset);
196 srv->fdidx[unsock].valid = 1;
197 srv->fdidx[unsock].server = 1;
198 srv->fdidx[unsock].control = 1;
199 srv->fdidx[unsock].priv = 0;
200 srv->fdidx[unsock].rsp_cs = 0;
201 srv->fdidx[unsock].rsp_size = 0;
202 srv->fdidx[unsock].rsp_limit = 0;
203 srv->fdidx[unsock].omtu = SDP_LOCAL_MTU;
204 srv->fdidx[unsock].rsp = NULL;
206 FD_SET(l2sock, &srv->fdset);
207 srv->fdidx[l2sock].valid = 1;
208 srv->fdidx[l2sock].server = 1;
209 srv->fdidx[l2sock].control = 0;
210 srv->fdidx[l2sock].priv = 0;
211 srv->fdidx[l2sock].rsp_cs = 0;
212 srv->fdidx[l2sock].rsp_size = 0;
213 srv->fdidx[l2sock].rsp_limit = 0;
214 srv->fdidx[l2sock].omtu = 0; /* unknown */
215 srv->fdidx[l2sock].rsp = NULL;
225 server_shutdown(server_p srv)
231 for (fd = 0; fd < srv->maxfd + 1; fd ++)
232 if (srv->fdidx[fd].valid)
233 server_close_fd(srv, fd);
238 memset(srv, 0, sizeof(*srv));
242 * Do one server iteration
246 server_do(server_p srv)
253 /* Copy cached version of the fd set and call select */
254 memcpy(&fdset, &srv->fdset, sizeof(fdset));
255 n = select(srv->maxfd + 1, &fdset, NULL, NULL, NULL);
260 log_err("Could not select(%d, %p). %s (%d)",
261 srv->maxfd + 1, &fdset, strerror(errno), errno);
266 /* Process descriptors */
267 for (fd = 0; fd < srv->maxfd + 1 && n > 0; fd ++) {
268 if (!FD_ISSET(fd, &fdset))
271 assert(srv->fdidx[fd].valid);
274 if (srv->fdidx[fd].server)
275 server_accept_client(srv, fd);
276 else if (server_process_request(srv, fd) != 0)
277 server_close_fd(srv, fd);
285 * Accept new client connection and register it with index
289 server_accept_client(server_p srv, int32_t fd)
292 int32_t cfd, size, priv;
296 cfd = accept(fd, NULL, NULL);
297 } while (cfd < 0 && errno == EINTR);
300 log_err("Could not accept connection on %s socket. %s (%d)",
301 srv->fdidx[fd].control? "control" : "L2CAP",
302 strerror(errno), errno);
306 assert(!FD_ISSET(cfd, &srv->fdset));
307 assert(!srv->fdidx[cfd].valid);
311 if (!srv->fdidx[fd].control) {
312 /* Get local BD_ADDR */
313 size = sizeof(srv->req_sa);
314 if (getsockname(cfd,(struct sockaddr*)&srv->req_sa,&size) < 0) {
315 log_err("Could not get local BD_ADDR. %s (%d)",
316 strerror(errno), errno);
321 /* Get outgoing MTU */
323 if (getsockopt(cfd,SOL_L2CAP,SO_L2CAP_OMTU,&omtu,&size) < 0) {
324 log_err("Could not get L2CAP OMTU. %s (%d)",
325 strerror(errno), errno);
331 * The maximum size of the L2CAP packet is 65536 bytes.
332 * The minimum L2CAP MTU is 43 bytes. That means we need
333 * 65536 / 43 = ~1524 chunks to transfer maximum packet
334 * size with minimum MTU. The "rsp_cs" field in fd_idx_t
335 * is 11 bit wide that gives us upto 2048 chunks.
338 if (omtu < NG_L2CAP_MTU_MINIMUM) {
339 log_err("L2CAP OMTU is too small (%d bytes)", omtu);
347 /* Get peer's credentials */
348 memset(&cr, 0, sizeof(cr));
351 if (getsockopt(cfd, 0, LOCAL_PEERCRED, &cr, &size) < 0) {
352 log_err("Could not get peer's credentials. %s (%d)",
353 strerror(errno), errno);
358 /* Check credentials */
359 pw = getpwuid(cr.cr_uid);
361 priv = (strcmp(pw->pw_name, "root") == 0);
363 log_warning("Could not verify credentials for uid %d",
366 memcpy(&srv->req_sa.l2cap_bdaddr, NG_HCI_BDADDR_ANY,
367 sizeof(srv->req_sa.l2cap_bdaddr));
369 omtu = srv->fdidx[fd].omtu;
373 * Allocate buffer. This is an overkill, but we can not know how
374 * big our reply is going to be.
377 rsp = (uint8_t *) calloc(NG_L2CAP_MTU_MAXIMUM, sizeof(rsp[0]));
379 log_crit("Could not allocate response buffer");
384 /* Add client descriptor to the index */
385 FD_SET(cfd, &srv->fdset);
386 if (srv->maxfd < cfd)
388 srv->fdidx[cfd].valid = 1;
389 srv->fdidx[cfd].server = 0;
390 srv->fdidx[cfd].control = srv->fdidx[fd].control;
391 srv->fdidx[cfd].priv = priv;
392 srv->fdidx[cfd].rsp_cs = 0;
393 srv->fdidx[cfd].rsp_size = 0;
394 srv->fdidx[cfd].rsp_limit = 0;
395 srv->fdidx[cfd].omtu = omtu;
396 srv->fdidx[cfd].rsp = rsp;
400 * Process request from the client
404 server_process_request(server_p srv, int32_t fd)
406 sdp_pdu_p pdu = (sdp_pdu_p) srv->req;
409 assert(srv->imtu > 0);
410 assert(srv->req != NULL);
411 assert(FD_ISSET(fd, &srv->fdset));
412 assert(srv->fdidx[fd].valid);
413 assert(!srv->fdidx[fd].server);
414 assert(srv->fdidx[fd].rsp != NULL);
415 assert(srv->fdidx[fd].omtu >= NG_L2CAP_MTU_MINIMUM);
418 len = read(fd, srv->req, srv->imtu);
419 } while (len < 0 && errno == EINTR);
422 log_err("Could not receive SDP request from %s socket. %s (%d)",
423 srv->fdidx[fd].control? "control" : "L2CAP",
424 strerror(errno), errno);
428 log_info("Client on %s socket has disconnected",
429 srv->fdidx[fd].control? "control" : "L2CAP");
433 if (sizeof(*pdu) + (pdu->len = ntohs(pdu->len)) == len) {
435 case SDP_PDU_SERVICE_SEARCH_REQUEST:
436 error = server_prepare_service_search_response(srv, fd);
439 case SDP_PDU_SERVICE_ATTRIBUTE_REQUEST:
440 error = server_prepare_service_attribute_response(srv, fd);
443 case SDP_PDU_SERVICE_SEARCH_ATTRIBUTE_REQUEST:
444 error = server_prepare_service_search_attribute_response(srv, fd);
447 case SDP_PDU_SERVICE_REGISTER_REQUEST:
448 error = server_prepare_service_register_response(srv, fd);
451 case SDP_PDU_SERVICE_UNREGISTER_REQUEST:
452 error = server_prepare_service_unregister_response(srv, fd);
455 case SDP_PDU_SERVICE_CHANGE_REQUEST:
456 error = server_prepare_service_change_response(srv, fd);
460 error = SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX;
464 error = SDP_ERROR_CODE_INVALID_PDU_SIZE;
468 case SDP_PDU_SERVICE_SEARCH_REQUEST:
469 error = server_send_service_search_response(srv, fd);
472 case SDP_PDU_SERVICE_ATTRIBUTE_REQUEST:
473 error = server_send_service_attribute_response(srv, fd);
476 case SDP_PDU_SERVICE_SEARCH_ATTRIBUTE_REQUEST:
477 error = server_send_service_search_attribute_response(srv, fd);
480 case SDP_PDU_SERVICE_REGISTER_REQUEST:
481 error = server_send_service_register_response(srv, fd);
484 case SDP_PDU_SERVICE_UNREGISTER_REQUEST:
485 error = server_send_service_unregister_response(srv, fd);
488 case SDP_PDU_SERVICE_CHANGE_REQUEST:
489 error = server_send_service_change_response(srv, fd);
492 error = SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX;
497 log_err("Could not send SDP response to %s socket, " \
498 "pdu->pid=%d, pdu->tid=%d, error=%d",
499 srv->fdidx[fd].control? "control" : "L2CAP",
500 pdu->pid, ntohs(pdu->tid), error);
502 log_err("Could not process SDP request from %s socket, " \
503 "pdu->pid=%d, pdu->tid=%d, pdu->len=%d, len=%d, " \
505 srv->fdidx[fd].control? "control" : "L2CAP",
506 pdu->pid, ntohs(pdu->tid), pdu->len, len, error);
508 error = server_send_error_response(srv, fd, error);
510 log_err("Could not send SDP error response to %s " \
511 "socket, pdu->pid=%d, pdu->tid=%d, error=%d",
512 srv->fdidx[fd].control? "control" : "L2CAP",
513 pdu->pid, ntohs(pdu->tid), error);
516 /* On error forget response (if any) */
518 srv->fdidx[fd].rsp_cs = 0;
519 srv->fdidx[fd].rsp_size = 0;
520 srv->fdidx[fd].rsp_limit = 0;
527 * Send SDP_Error_Response PDU
531 server_send_error_response(server_p srv, int32_t fd, uint16_t error)
538 } __attribute__ ((packed)) rsp;
540 /* Prepare and send SDP error response */
541 rsp.pdu.pid = SDP_PDU_ERROR_RESPONSE;
542 rsp.pdu.tid = ((sdp_pdu_p)(srv->req))->tid;
543 rsp.pdu.len = htons(sizeof(rsp.error));
544 rsp.error = htons(error);
547 size = write(fd, &rsp, sizeof(rsp));
548 } while (size < 0 && errno == EINTR);
550 return ((size < 0)? errno : 0);
554 * Close descriptor and remove it from index
558 server_close_fd(server_p srv, int32_t fd)
560 provider_p provider = NULL, provider_next = NULL;
562 assert(FD_ISSET(fd, &srv->fdset));
563 assert(srv->fdidx[fd].valid);
567 FD_CLR(fd, &srv->fdset);
568 if (fd == srv->maxfd)
571 if (srv->fdidx[fd].rsp != NULL)
572 free(srv->fdidx[fd].rsp);
574 memset(&srv->fdidx[fd], 0, sizeof(srv->fdidx[fd]));
576 for (provider = provider_get_first();
578 provider = provider_next) {
579 provider_next = provider_get_next(provider);
581 if (provider->fd == fd)
582 provider_unregister(provider);