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Diffstat (limited to 'sdpd/main.c')
| -rw-r--r-- | sdpd/main.c | 471 |
1 files changed, 471 insertions, 0 deletions
diff --git a/sdpd/main.c b/sdpd/main.c new file mode 100644 index 00000000..fea283f2 --- /dev/null +++ b/sdpd/main.c @@ -0,0 +1,471 @@ +/* + Service Discovery Protocol (SDP) + Copyright (C) 2002 Maxim Krasnyansky <maxk@qualcomm.com>, Stephen Crane <steve.crane@rococosoft.com> + + Based on original SDP implementation by Nokia Corporation. + Copyright (C) 2001,2002 Nokia Corporation. + Original author Guruprasad Krishnamurthy <guruprasad.krishnamurthy@nokia.com> + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License version 2 as + published by the Free Software Foundation; + + THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. + IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY CLAIM, + OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER + RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, + NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE + USE OR PERFORMANCE OF THIS SOFTWARE. + + ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, COPYRIGHTS, + TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS SOFTWARE IS DISCLAIMED. +*/ + +/* + SDP server initialization and connection handling + + Fixes: + Guruprasad Krishnamurthy <guruprasad.krishnamurthy@nokia.com> + Imre Deak <ext-imre.deak@nokia.com> +*/ + +/* + * $Id$ + */ +#include <stdlib.h> +#include <unistd.h> +#include <stdio.h> +#include <errno.h> +#include <signal.h> +#include <getopt.h> +#include <sys/un.h> +#include <sys/select.h> +#include <sys/stat.h> +#include <sys/ioctl.h> +#include <sys/socket.h> + +#include <bluetooth/bluetooth.h> +#include <bluetooth/l2cap.h> +#include <bluetooth/sdp.h> +#include <bluetooth/sdp_lib.h> +#include <bluetooth/sdp_internal.h> + +#include "sdpd.h" + +static int l2cap_sock, unix_sock; +static fd_set active_fdset; +static int active_maxfd; + +sdp_record_t *server; + +/* + * List of version numbers supported by the SDP server. + * Add to this list when newer versions are supported. + */ +static sdp_version_t sdpVnumArray[1] = { + {1, 0} +}; +const int sdpServerVnumEntries = 1; + +/* + * The service database state is an attribute of the service record + * of the SDP server itself. This attribute is guaranteed to + * change if any of the contents of the service repository + * changes. This function updates the timestamp of value of + * the svcDBState attribute + * Set the SDP server DB. Simply a timestamp which is the marker + * when the DB was modified. + */ +void update_db_timestamp(void) +{ + uint32_t dbts = sdp_get_time(); + sdp_data_t *d = sdp_data_alloc(SDP_UINT32, &dbts); + sdp_attr_replace(server, SDP_ATTR_SVCDB_STATE, d); +} + +static void add_lang_attr(sdp_record_t *r) +{ + sdp_lang_attr_t base_lang; + sdp_list_t *langs = 0; + + base_lang.code_ISO639 = (0x65 << 8) | 0x6e; + // UTF-8 MIBenum (http://www.iana.org/assignments/character-sets) + base_lang.encoding = 106; + base_lang.base_offset = SDP_PRIMARY_LANG_BASE; + langs = sdp_list_append(0, &base_lang); + sdp_set_lang_attr(r, langs); + sdp_list_free(langs, 0); +} + +static void register_public_browse_group(void) +{ + sdp_list_t *browselist; + uuid_t bgscid, pbgid; + sdp_data_t *sdpdata; + sdp_record_t *browse = sdp_record_alloc(); + + browse->handle = (uint32_t)browse; + sdp_record_add(browse); + sdpdata = sdp_data_alloc(SDP_UINT32, &browse->handle); + sdp_attr_add(browse, SDP_ATTR_RECORD_HANDLE, sdpdata); + + add_lang_attr(browse); + sdp_set_info_attr(browse, "Public Browse Group Root", "BlueZ", "Root of public browse hierarchy"); + + sdp_uuid16_create(&bgscid, BROWSE_GRP_DESC_SVCLASS_ID); + browselist = sdp_list_append(0, &bgscid); + sdp_set_service_classes(browse, browselist); + sdp_list_free(browselist, 0); + + sdp_uuid16_create(&pbgid, PUBLIC_BROWSE_GROUP); + sdp_set_group_id(browse, pbgid); +} + +/* + * The SDP server must present its own service record to + * the service repository. This can be accessed by service + * discovery clients. This method constructs a service record + * and stores it in the repository + */ +static void register_server_service(void) +{ + int i; + sdp_list_t *classIDList, *browseList; + sdp_list_t *access_proto = 0; + uuid_t l2cap, classID, browseGroupId, sdpSrvUUID; + void **versions, **versionDTDs; + uint8_t dtd; + uint16_t version, port; + sdp_data_t *pData, *port_data, *version_data; + sdp_list_t *pd, *seq; + + server = sdp_record_alloc(); + server->pattern = NULL; + + /* Force the record to be SDP_SERVER_RECORD_HANDLE */ + server->handle = SDP_SERVER_RECORD_HANDLE; + + sdp_record_add(server); + sdp_attr_add(server, SDP_ATTR_RECORD_HANDLE, sdp_data_alloc(SDP_UINT32, &server->handle)); + + /* + * Add all attributes to service record. (No need to commit since we + * are the server and this record is already in the database.) + */ + add_lang_attr(server); + sdp_set_info_attr(server, "SDP Server", "BlueZ", "Bluetooth service discovery server"); + + sdp_uuid16_create(&classID, SDP_SERVER_SVCLASS_ID); + classIDList = sdp_list_append(0, &classID); + sdp_set_service_classes(server, classIDList); + sdp_list_free(classIDList, 0); + + /* + * Set the version numbers supported, these are passed as arguments + * to the server on command line. Now defaults to 1.0 + * Build the version number sequence first + */ + versions = (void **)malloc(sdpServerVnumEntries * sizeof(void *)); + versionDTDs = (void **)malloc(sdpServerVnumEntries * sizeof(void *)); + dtd = SDP_UINT16; + for (i = 0; i < sdpServerVnumEntries; i++) { + uint16_t *version = (uint16_t *)malloc(sizeof(uint16_t)); + *version = sdpVnumArray[i].major; + *version = (*version << 8); + *version |= sdpVnumArray[i].minor; + versions[i] = version; + versionDTDs[i] = &dtd; + } + pData = sdp_seq_alloc(versionDTDs, versions, sdpServerVnumEntries); + for (i = 0; i < sdpServerVnumEntries; i++) + free(versions[i]); + free(versions); + free(versionDTDs); + sdp_attr_add(server, SDP_ATTR_VERSION_NUM_LIST, pData); + + sdp_uuid16_create(&sdpSrvUUID, SDP_UUID); + sdp_set_service_id(server, sdpSrvUUID); + + sdp_uuid16_create(&l2cap, L2CAP_UUID); + pd = sdp_list_append(0, &l2cap); + port = SDP_PSM; + port_data = sdp_data_alloc(SDP_UINT16, &port); + pd = sdp_list_append(pd, port_data); + version = 1; + version_data = sdp_data_alloc(SDP_UINT16, &version); + pd = sdp_list_append(pd, version_data); + seq = sdp_list_append(0, pd); + + access_proto = sdp_list_append(0, seq); + sdp_set_access_protos(server, access_proto); + sdp_list_free(access_proto, free); + sdp_data_free(port_data); + sdp_data_free(version_data); + sdp_list_free(pd, 0); + + sdp_uuid16_create(&browseGroupId, PUBLIC_BROWSE_GROUP); + browseList = sdp_list_append(0, &browseGroupId); + sdp_set_browse_groups(server, browseList); + sdp_list_free(browseList, 0); + + update_db_timestamp(); +} + +/* + * SDP server initialization on startup includes creating the + * l2cap and unix sockets over which discovery and registration clients + * access us respectively + */ +int init_server(int master) +{ + struct sockaddr_l2 l2addr; + struct sockaddr_un unaddr; + + /* Register the public browse group root */ + register_public_browse_group(); + + /* Register the SDP server's service record */ + register_server_service(); + + /* Create L2CAP socket */ + l2cap_sock = socket(PF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP); + if (l2cap_sock == -1) { + SDPERR("opening L2CAP socket: %s", strerror(errno)); + return -1; + } + + l2addr.l2_bdaddr = *BDADDR_ANY; + l2addr.l2_family = AF_BLUETOOTH; + l2addr.l2_psm = htobs(SDP_PSM); + if (0 > bind(l2cap_sock, (struct sockaddr *)&l2addr, sizeof(l2addr))) { + SDPERR("binding L2CAP socket: %s", strerror(errno)); + return -1; + } + + if (master) { + int opt = L2CAP_LM_MASTER; + if (0 > setsockopt(l2cap_sock, SOL_L2CAP, L2CAP_LM, &opt, sizeof(opt))) { + SDPERR("setsockopt: %s", strerror(errno)); + return -1; + } + } + listen(l2cap_sock, 5); + FD_SET(l2cap_sock, &active_fdset); + active_maxfd = l2cap_sock; + + /* Create local Unix socket */ + unix_sock = socket(PF_UNIX, SOCK_STREAM, 0); + if (unix_sock == -1) { + SDPERR("opening UNIX socket: %s", strerror(errno)); + return -1; + } + unaddr.sun_family = AF_UNIX; + strcpy(unaddr.sun_path, SDP_UNIX_PATH); + unlink(unaddr.sun_path); + if (0 > bind(unix_sock, (struct sockaddr *)&unaddr, sizeof(unaddr))) { + SDPERR("binding UNIX socket: %s", strerror(errno)); + return -1; + } + listen(unix_sock, 5); + FD_SET(unix_sock, &active_fdset); + active_maxfd = unix_sock; + chmod(SDP_UNIX_PATH, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); + return 0; +} + +void sig_term(int sig) +{ + SDPINF("terminating... \n"); + sdp_svcdb_reset(); + close(l2cap_sock); + close(unix_sock); + exit(0); +} + +int become_daemon(void) +{ + int fd; + + if (getppid() != 1) { + signal(SIGTTOU, SIG_IGN); + signal(SIGTTIN, SIG_IGN); + signal(SIGTSTP, SIG_IGN); + if (fork()) + return 0; + setsid(); + } + for (fd = 0; fd < 3; fd++) + close(fd); + + chdir("/"); + return 1; +} + +static inline void handle_request(int sk, char *data, int len) +{ + struct sockaddr_l2 sa; + int size; + sdp_req_t req; + + size = sizeof(sa); + if (getpeername(sk, (struct sockaddr *)&sa, &size) < 0) + return; + + if (sa.l2_family == AF_BLUETOOTH) { + struct l2cap_options lo; + size = sizeof(lo); + getsockopt(sk, SOL_L2CAP, L2CAP_OPTIONS, &lo, &size); + req.bdaddr = sa.l2_bdaddr; + req.mtu = lo.omtu; + req.local = 0; + } else { + req.bdaddr = *BDADDR_LOCAL; + req.mtu = 2048; + req.local = 1; + } + req.sock = sk; + req.buf = data; + req.len = len; + process_request(&req); +} + +static void close_sock(int fd, int r) +{ + if (r < 0) + SDPERR("Read error: %s", strerror(errno)); + FD_CLR(fd, &active_fdset); + close(fd); + sdp_svcdb_collect_all(fd); + if (fd == active_maxfd) + active_maxfd--; +} + +static void check_active(fd_set *mask, int num) +{ + sdp_pdu_hdr_t hdr; + int size, fd, count, r; + char *buf; + + for (fd = 0, count = 0; fd <= active_maxfd && count < num; fd++) { + if (fd == l2cap_sock || fd == unix_sock || !FD_ISSET(fd, mask)) + continue; + + count++; + + r = recv(fd, (void *)&hdr, sizeof(sdp_pdu_hdr_t), MSG_PEEK); + if (r <= 0) { + close_sock(fd, r); + continue; + } + + size = sizeof(sdp_pdu_hdr_t) + ntohs(hdr.plen); + buf = malloc(size); + if (!buf) + continue; + + r = recv(fd, buf, size, 0); + if (r <= 0) + close_sock(fd, r); + else + handle_request(fd, buf, r); + } +} + +void usage(void) +{ + printf("sdpd version %s\n", VERSION); + printf("Usage:\n" + "sdpd [-n] [-m]\n" + ); +} + +static struct option main_options[] = { + {"help", 0,0, 'h'}, + {"nodaemon", 0,0, 'n'}, + {"master", 0,0, 'm'}, + {0, 0, 0, 0} +}; + +int main(int argc, char **argv) +{ + int daemon = 1; + int master = 0; + int opt; + + while ((opt = getopt_long(argc, argv, "nm", main_options, NULL)) != -1) + switch (opt) { + case 'n': + daemon = 0; + break; + case 'm': + master = 1; + break; + default: + usage(); + exit(0); + } + openlog("sdpd", LOG_PID | LOG_NDELAY, LOG_DAEMON); + + if (daemon && !become_daemon()) + return 0; + + argc -= optind; + argv += optind; + + if (init_server(master) < 0) { + SDPERR("Server initialization failed"); + return -1; + } + + SDPINF("sdpd v%s started", VERSION); + + signal(SIGINT, sig_term); + signal(SIGTERM, sig_term); + signal(SIGABRT, sig_term); + signal(SIGQUIT, sig_term); + signal(SIGPIPE, SIG_IGN); + + for (;;) { + int num, nfd; + fd_set mask; + + FD_ZERO(&mask); + mask = active_fdset; + + num = select(active_maxfd + 1, &mask, NULL, NULL, NULL); + if (num <= 0) { + SDPDBG("Select error:%s", strerror(errno)); + goto exit; + } + + if (FD_ISSET(l2cap_sock, &mask)) { + /* New L2CAP connection */ + struct sockaddr_l2 caddr; + socklen_t len = sizeof(caddr); + + nfd = accept(l2cap_sock, (struct sockaddr *)&caddr, &len); + if (nfd >= 0) { + if (nfd > active_maxfd) + active_maxfd = nfd; + FD_SET(nfd, &active_fdset); + } + } else if (FD_ISSET(unix_sock, &mask)) { + /* New unix connection */ + struct sockaddr_un caddr; + socklen_t len = sizeof(caddr); + + nfd = accept(unix_sock, (struct sockaddr *)&caddr, &len); + if (nfd != -1) { + if (nfd > active_maxfd) + active_maxfd = nfd; + FD_SET(nfd, &active_fdset); + } + } else + check_active(&mask, num); + } +exit: + sdp_svcdb_reset(); + return 0; +} |