diff options
Diffstat (limited to 'usr.sbin/bluetooth/sdpd/server.c')
-rw-r--r-- | usr.sbin/bluetooth/sdpd/server.c | 590 |
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); + } +} + |