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-rw-r--r--usr.sbin/bluetooth/sdpd/server.c590
1 files changed, 590 insertions, 0 deletions
diff --git a/usr.sbin/bluetooth/sdpd/server.c b/usr.sbin/bluetooth/sdpd/server.c
new file mode 100644
index 0000000..abd1815
--- /dev/null
+++ b/usr.sbin/bluetooth/sdpd/server.c
@@ -0,0 +1,590 @@
+/*
+ * server.c
+ *
+ * Copyright (c) 2004 Maksim Yevmenkin <m_evmenkin@yahoo.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $Id: server.c,v 1.6 2004/01/13 01:54:39 max Exp $
+ * $FreeBSD$
+ */
+
+#include <sys/param.h>
+#include <sys/select.h>
+#include <sys/stat.h>
+#include <sys/queue.h>
+#include <sys/ucred.h>
+#include <sys/un.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <assert.h>
+#define L2CAP_SOCKET_CHECKED
+#include <bluetooth.h>
+#include <errno.h>
+#include <pwd.h>
+#include <sdp.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include "log.h"
+#include "profile.h"
+#include "provider.h"
+#include "server.h"
+
+static void server_accept_client (server_p srv, int32_t fd);
+static int32_t server_process_request (server_p srv, int32_t fd);
+static int32_t server_send_error_response (server_p srv, int32_t fd,
+ uint16_t error);
+static void server_close_fd (server_p srv, int32_t fd);
+
+/*
+ * Initialize server
+ */
+
+int32_t
+server_init(server_p srv, char const *control)
+{
+ struct sockaddr_un un;
+ struct sockaddr_l2cap l2;
+ int32_t unsock, l2sock;
+ socklen_t size;
+ uint16_t imtu;
+
+ assert(srv != NULL);
+ assert(control != NULL);
+
+ memset(srv, 0, sizeof(*srv));
+
+ /* Open control socket */
+ if (unlink(control) < 0 && errno != ENOENT) {
+ log_crit("Could not unlink(%s). %s (%d)",
+ control, strerror(errno), errno);
+ return (-1);
+ }
+
+ unsock = socket(PF_LOCAL, SOCK_STREAM, 0);
+ if (unsock < 0) {
+ log_crit("Could not create control socket. %s (%d)",
+ strerror(errno), errno);
+ return (-1);
+ }
+
+ memset(&un, 0, sizeof(un));
+ un.sun_len = sizeof(un);
+ un.sun_family = AF_LOCAL;
+ strlcpy(un.sun_path, control, sizeof(un.sun_path));
+
+ if (bind(unsock, (struct sockaddr *) &un, sizeof(un)) < 0) {
+ log_crit("Could not bind control socket. %s (%d)",
+ strerror(errno), errno);
+ close(unsock);
+ return (-1);
+ }
+
+ if (chmod(control, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH) < 0) {
+ log_crit("Could not change permissions on control socket. " \
+ "%s (%d)", strerror(errno), errno);
+ close(unsock);
+ return (-1);
+ }
+
+ if (listen(unsock, 10) < 0) {
+ log_crit("Could not listen on control socket. %s (%d)",
+ strerror(errno), errno);
+ close(unsock);
+ return (-1);
+ }
+
+ /* Open L2CAP socket */
+ l2sock = socket(PF_BLUETOOTH, SOCK_SEQPACKET, BLUETOOTH_PROTO_L2CAP);
+ if (l2sock < 0) {
+ log_crit("Could not create L2CAP socket. %s (%d)",
+ strerror(errno), errno);
+ close(unsock);
+ return (-1);
+ }
+
+ size = sizeof(imtu);
+ if (getsockopt(l2sock, SOL_L2CAP, SO_L2CAP_IMTU, &imtu, &size) < 0) {
+ log_crit("Could not get L2CAP IMTU. %s (%d)",
+ strerror(errno), errno);
+ close(unsock);
+ close(l2sock);
+ return (-1);
+ }
+
+ memset(&l2, 0, sizeof(l2));
+ l2.l2cap_len = sizeof(l2);
+ l2.l2cap_family = AF_BLUETOOTH;
+ memcpy(&l2.l2cap_bdaddr, NG_HCI_BDADDR_ANY, sizeof(l2.l2cap_bdaddr));
+ l2.l2cap_psm = htole16(NG_L2CAP_PSM_SDP);
+
+ if (bind(l2sock, (struct sockaddr *) &l2, sizeof(l2)) < 0) {
+ log_crit("Could not bind L2CAP socket. %s (%d)",
+ strerror(errno), errno);
+ close(unsock);
+ close(l2sock);
+ return (-1);
+ }
+
+ if (listen(l2sock, 10) < 0) {
+ log_crit("Could not listen on L2CAP socket. %s (%d)",
+ strerror(errno), errno);
+ close(unsock);
+ close(l2sock);
+ return (-1);
+ }
+
+ /* Allocate incoming buffer */
+ srv->imtu = (imtu > SDP_LOCAL_MTU)? imtu : SDP_LOCAL_MTU;
+ srv->req = (uint8_t *) calloc(srv->imtu, sizeof(srv->req[0]));
+ if (srv->req == NULL) {
+ log_crit("Could not allocate request buffer");
+ close(unsock);
+ close(l2sock);
+ return (-1);
+ }
+
+ /* Allocate memory for descriptor index */
+ srv->fdidx = (fd_idx_p) calloc(FD_SETSIZE, sizeof(srv->fdidx[0]));
+ if (srv->fdidx == NULL) {
+ log_crit("Could not allocate fd index");
+ free(srv->req);
+ close(unsock);
+ close(l2sock);
+ return (-1);
+ }
+
+ /* Register Service Discovery profile (attach it to control socket) */
+ if (provider_register_sd(unsock) < 0) {
+ log_crit("Could not register Service Discovery profile");
+ free(srv->fdidx);
+ free(srv->req);
+ close(unsock);
+ close(l2sock);
+ return (-1);
+ }
+
+ /*
+ * If we got here then everything is fine. Add both control sockets
+ * to the index.
+ */
+
+ FD_ZERO(&srv->fdset);
+ srv->maxfd = (unsock > l2sock)? unsock : l2sock;
+
+ FD_SET(unsock, &srv->fdset);
+ srv->fdidx[unsock].valid = 1;
+ srv->fdidx[unsock].server = 1;
+ srv->fdidx[unsock].control = 1;
+ srv->fdidx[unsock].priv = 0;
+ srv->fdidx[unsock].rsp_cs = 0;
+ srv->fdidx[unsock].rsp_size = 0;
+ srv->fdidx[unsock].rsp_limit = 0;
+ srv->fdidx[unsock].omtu = SDP_LOCAL_MTU;
+ srv->fdidx[unsock].rsp = NULL;
+
+ FD_SET(l2sock, &srv->fdset);
+ srv->fdidx[l2sock].valid = 1;
+ srv->fdidx[l2sock].server = 1;
+ srv->fdidx[l2sock].control = 0;
+ srv->fdidx[l2sock].priv = 0;
+ srv->fdidx[l2sock].rsp_cs = 0;
+ srv->fdidx[l2sock].rsp_size = 0;
+ srv->fdidx[l2sock].rsp_limit = 0;
+ srv->fdidx[l2sock].omtu = 0; /* unknown */
+ srv->fdidx[l2sock].rsp = NULL;
+
+ return (0);
+}
+
+/*
+ * Shutdown server
+ */
+
+void
+server_shutdown(server_p srv)
+{
+ int fd;
+
+ assert(srv != NULL);
+
+ for (fd = 0; fd < srv->maxfd + 1; fd ++)
+ if (srv->fdidx[fd].valid)
+ server_close_fd(srv, fd);
+
+ free(srv->req);
+ free(srv->fdidx);
+
+ memset(srv, 0, sizeof(*srv));
+}
+
+/*
+ * Do one server iteration
+ */
+
+int32_t
+server_do(server_p srv)
+{
+ fd_set fdset;
+ int32_t n, fd;
+
+ assert(srv != NULL);
+
+ /* Copy cached version of the fd set and call select */
+ memcpy(&fdset, &srv->fdset, sizeof(fdset));
+ n = select(srv->maxfd + 1, &fdset, NULL, NULL, NULL);
+ if (n < 0) {
+ if (errno == EINTR)
+ return (0);
+
+ log_err("Could not select(%d, %p). %s (%d)",
+ srv->maxfd + 1, &fdset, strerror(errno), errno);
+
+ return (-1);
+ }
+
+ /* Process descriptors */
+ for (fd = 0; fd < srv->maxfd + 1 && n > 0; fd ++) {
+ if (!FD_ISSET(fd, &fdset))
+ continue;
+
+ assert(srv->fdidx[fd].valid);
+ n --;
+
+ if (srv->fdidx[fd].server)
+ server_accept_client(srv, fd);
+ else if (server_process_request(srv, fd) != 0)
+ server_close_fd(srv, fd);
+ }
+
+ return (0);
+
+}
+
+/*
+ * Accept new client connection and register it with index
+ */
+
+static void
+server_accept_client(server_p srv, int32_t fd)
+{
+ uint8_t *rsp = NULL;
+ int32_t cfd, priv;
+ uint16_t omtu;
+ socklen_t size;
+
+ do {
+ cfd = accept(fd, NULL, NULL);
+ } while (cfd < 0 && errno == EINTR);
+
+ if (cfd < 0) {
+ log_err("Could not accept connection on %s socket. %s (%d)",
+ srv->fdidx[fd].control? "control" : "L2CAP",
+ strerror(errno), errno);
+ return;
+ }
+
+ assert(!FD_ISSET(cfd, &srv->fdset));
+ assert(!srv->fdidx[cfd].valid);
+
+ priv = 0;
+
+ if (!srv->fdidx[fd].control) {
+ /* Get local BD_ADDR */
+ size = sizeof(srv->req_sa);
+ if (getsockname(cfd,(struct sockaddr*)&srv->req_sa,&size) < 0) {
+ log_err("Could not get local BD_ADDR. %s (%d)",
+ strerror(errno), errno);
+ close(cfd);
+ return;
+ }
+
+ /* Get outgoing MTU */
+ size = sizeof(omtu);
+ if (getsockopt(cfd,SOL_L2CAP,SO_L2CAP_OMTU,&omtu,&size) < 0) {
+ log_err("Could not get L2CAP OMTU. %s (%d)",
+ strerror(errno), errno);
+ close(cfd);
+ return;
+ }
+
+ /*
+ * The maximum size of the L2CAP packet is 65536 bytes.
+ * The minimum L2CAP MTU is 43 bytes. That means we need
+ * 65536 / 43 = ~1524 chunks to transfer maximum packet
+ * size with minimum MTU. The "rsp_cs" field in fd_idx_t
+ * is 11 bits wide, which gives us up to 2048 chunks.
+ */
+
+ if (omtu < NG_L2CAP_MTU_MINIMUM) {
+ log_err("L2CAP OMTU is too small (%d bytes)", omtu);
+ close(cfd);
+ return;
+ }
+ } else {
+ struct xucred cr;
+ struct passwd *pw;
+
+ /* Get peer's credentials */
+ memset(&cr, 0, sizeof(cr));
+ size = sizeof(cr);
+
+ if (getsockopt(cfd, 0, LOCAL_PEERCRED, &cr, &size) < 0) {
+ log_err("Could not get peer's credentials. %s (%d)",
+ strerror(errno), errno);
+ close(cfd);
+ return;
+ }
+
+ /* Check credentials */
+ pw = getpwuid(cr.cr_uid);
+ if (pw != NULL)
+ priv = (strcmp(pw->pw_name, "root") == 0);
+ else
+ log_warning("Could not verify credentials for uid %d",
+ cr.cr_uid);
+
+ memcpy(&srv->req_sa.l2cap_bdaddr, NG_HCI_BDADDR_ANY,
+ sizeof(srv->req_sa.l2cap_bdaddr));
+
+ omtu = srv->fdidx[fd].omtu;
+ }
+
+ /*
+ * Allocate buffer. This is an overkill, but we can not know how
+ * big our reply is going to be.
+ */
+
+ rsp = (uint8_t *) calloc(NG_L2CAP_MTU_MAXIMUM, sizeof(rsp[0]));
+ if (rsp == NULL) {
+ log_crit("Could not allocate response buffer");
+ close(cfd);
+ return;
+ }
+
+ /* Add client descriptor to the index */
+ FD_SET(cfd, &srv->fdset);
+ if (srv->maxfd < cfd)
+ srv->maxfd = cfd;
+ srv->fdidx[cfd].valid = 1;
+ srv->fdidx[cfd].server = 0;
+ srv->fdidx[cfd].control = srv->fdidx[fd].control;
+ srv->fdidx[cfd].priv = priv;
+ srv->fdidx[cfd].rsp_cs = 0;
+ srv->fdidx[cfd].rsp_size = 0;
+ srv->fdidx[cfd].rsp_limit = 0;
+ srv->fdidx[cfd].omtu = omtu;
+ srv->fdidx[cfd].rsp = rsp;
+}
+
+/*
+ * Process request from the client
+ */
+
+static int32_t
+server_process_request(server_p srv, int32_t fd)
+{
+ sdp_pdu_p pdu = (sdp_pdu_p) srv->req;
+ int32_t len, error;
+
+ assert(srv->imtu > 0);
+ assert(srv->req != NULL);
+ assert(FD_ISSET(fd, &srv->fdset));
+ assert(srv->fdidx[fd].valid);
+ assert(!srv->fdidx[fd].server);
+ assert(srv->fdidx[fd].rsp != NULL);
+ assert(srv->fdidx[fd].omtu >= NG_L2CAP_MTU_MINIMUM);
+
+ do {
+ len = read(fd, srv->req, srv->imtu);
+ } while (len < 0 && errno == EINTR);
+
+ if (len < 0) {
+ log_err("Could not receive SDP request from %s socket. %s (%d)",
+ srv->fdidx[fd].control? "control" : "L2CAP",
+ strerror(errno), errno);
+ return (-1);
+ }
+ if (len == 0) {
+ log_info("Client on %s socket has disconnected",
+ srv->fdidx[fd].control? "control" : "L2CAP");
+ return (-1);
+ }
+
+ if (len >= sizeof(*pdu) &&
+ sizeof(*pdu) + (pdu->len = ntohs(pdu->len)) == len) {
+ switch (pdu->pid) {
+ case SDP_PDU_SERVICE_SEARCH_REQUEST:
+ error = server_prepare_service_search_response(srv, fd);
+ break;
+
+ case SDP_PDU_SERVICE_ATTRIBUTE_REQUEST:
+ error = server_prepare_service_attribute_response(srv, fd);
+ break;
+
+ case SDP_PDU_SERVICE_SEARCH_ATTRIBUTE_REQUEST:
+ error = server_prepare_service_search_attribute_response(srv, fd);
+ break;
+
+ case SDP_PDU_SERVICE_REGISTER_REQUEST:
+ error = server_prepare_service_register_response(srv, fd);
+ break;
+
+ case SDP_PDU_SERVICE_UNREGISTER_REQUEST:
+ error = server_prepare_service_unregister_response(srv, fd);
+ break;
+
+ case SDP_PDU_SERVICE_CHANGE_REQUEST:
+ error = server_prepare_service_change_response(srv, fd);
+ break;
+
+ default:
+ error = SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX;
+ break;
+ }
+ } else
+ error = SDP_ERROR_CODE_INVALID_PDU_SIZE;
+
+ if (error == 0) {
+ switch (pdu->pid) {
+ case SDP_PDU_SERVICE_SEARCH_REQUEST:
+ error = server_send_service_search_response(srv, fd);
+ break;
+
+ case SDP_PDU_SERVICE_ATTRIBUTE_REQUEST:
+ error = server_send_service_attribute_response(srv, fd);
+ break;
+
+ case SDP_PDU_SERVICE_SEARCH_ATTRIBUTE_REQUEST:
+ error = server_send_service_search_attribute_response(srv, fd);
+ break;
+
+ case SDP_PDU_SERVICE_REGISTER_REQUEST:
+ error = server_send_service_register_response(srv, fd);
+ break;
+
+ case SDP_PDU_SERVICE_UNREGISTER_REQUEST:
+ error = server_send_service_unregister_response(srv, fd);
+ break;
+
+ case SDP_PDU_SERVICE_CHANGE_REQUEST:
+ error = server_send_service_change_response(srv, fd);
+ break;
+
+ default:
+ error = SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX;
+ break;
+ }
+
+ if (error != 0)
+ log_err("Could not send SDP response to %s socket, " \
+ "pdu->pid=%d, pdu->tid=%d, error=%d",
+ srv->fdidx[fd].control? "control" : "L2CAP",
+ pdu->pid, ntohs(pdu->tid), error);
+ } else {
+ log_err("Could not process SDP request from %s socket, " \
+ "pdu->pid=%d, pdu->tid=%d, pdu->len=%d, len=%d, " \
+ "error=%d",
+ srv->fdidx[fd].control? "control" : "L2CAP",
+ pdu->pid, ntohs(pdu->tid), pdu->len, len, error);
+
+ error = server_send_error_response(srv, fd, error);
+ if (error != 0)
+ log_err("Could not send SDP error response to %s " \
+ "socket, pdu->pid=%d, pdu->tid=%d, error=%d",
+ srv->fdidx[fd].control? "control" : "L2CAP",
+ pdu->pid, ntohs(pdu->tid), error);
+ }
+
+ /* On error forget response (if any) */
+ if (error != 0) {
+ srv->fdidx[fd].rsp_cs = 0;
+ srv->fdidx[fd].rsp_size = 0;
+ srv->fdidx[fd].rsp_limit = 0;
+ }
+
+ return (error);
+}
+
+/*
+ * Send SDP_Error_Response PDU
+ */
+
+static int32_t
+server_send_error_response(server_p srv, int32_t fd, uint16_t error)
+{
+ int32_t size;
+
+ struct {
+ sdp_pdu_t pdu;
+ uint16_t error;
+ } __attribute__ ((packed)) rsp;
+
+ /* Prepare and send SDP error response */
+ rsp.pdu.pid = SDP_PDU_ERROR_RESPONSE;
+ rsp.pdu.tid = ((sdp_pdu_p)(srv->req))->tid;
+ rsp.pdu.len = htons(sizeof(rsp.error));
+ rsp.error = htons(error);
+
+ do {
+ size = write(fd, &rsp, sizeof(rsp));
+ } while (size < 0 && errno == EINTR);
+
+ return ((size < 0)? errno : 0);
+}
+
+/*
+ * Close descriptor and remove it from index
+ */
+
+static void
+server_close_fd(server_p srv, int32_t fd)
+{
+ provider_p provider = NULL, provider_next = NULL;
+
+ assert(FD_ISSET(fd, &srv->fdset));
+ assert(srv->fdidx[fd].valid);
+
+ close(fd);
+
+ FD_CLR(fd, &srv->fdset);
+ if (fd == srv->maxfd)
+ srv->maxfd --;
+
+ if (srv->fdidx[fd].rsp != NULL)
+ free(srv->fdidx[fd].rsp);
+
+ memset(&srv->fdidx[fd], 0, sizeof(srv->fdidx[fd]));
+
+ for (provider = provider_get_first();
+ provider != NULL;
+ provider = provider_next) {
+ provider_next = provider_get_next(provider);
+
+ if (provider->fd == fd)
+ provider_unregister(provider);
+ }
+}
+
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