| #define _GNU_SOURCE |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <stdint.h> |
| #include <unistd.h> |
| |
| #include <pthread.h> |
| |
| #include <wintypes.h> |
| #include <winscard.h> |
| #include <pcsclite.h> |
| |
| #include <sys/socket.h> |
| #include <netdb.h> |
| |
| #include <osmocom/core/socket.h> |
| #include <osmocom/core/linuxlist.h> |
| #include <osmocom/core/logging.h> |
| #include <osmocom/core/application.h> |
| |
| #include <osmocom/gsm/ipa.h> |
| #include <osmocom/gsm/protocol/ipaccess.h> |
| |
| #include <asn1c/asn_application.h> |
| #include <osmocom/rspro/RsproPDU.h> |
| |
| #include "bankd.h" |
| #include "rspro_util.h" |
| |
| __thread void *talloc_asn1_ctx; |
| |
| static void *worker_main(void *arg); |
| |
| /*********************************************************************** |
| * bankd core / main thread |
| ***********************************************************************/ |
| |
| static const struct log_info_cat default_categories[] = { |
| [DMAIN] = { |
| .name = "DMAIN", |
| .loglevel = LOGL_DEBUG, |
| .enabled = 1, |
| }, |
| }; |
| |
| static const struct log_info log_info = { |
| .cat = default_categories, |
| .num_cat = ARRAY_SIZE(default_categories), |
| }; |
| |
| int asn_debug; |
| |
| static void bankd_init(struct bankd *bankd) |
| { |
| void *g_tall_ctx = talloc_named_const(NULL, 0, "global"); |
| osmo_init_logging2(g_tall_ctx, &log_info); |
| |
| asn_debug = 0; |
| |
| /* intialize members of 'bankd' */ |
| INIT_LLIST_HEAD(&bankd->slot_mappings); |
| pthread_rwlock_init(&bankd->slot_mappings_rwlock, NULL); |
| INIT_LLIST_HEAD(&bankd->workers); |
| pthread_mutex_init(&bankd->workers_mutex, NULL); |
| |
| bankd->comp_id.type = ComponentType_remsimBankd; |
| OSMO_STRLCPY_ARRAY(bankd->comp_id.name, "fixme-name"); |
| OSMO_STRLCPY_ARRAY(bankd->comp_id.software, "remsim-bankd"); |
| OSMO_STRLCPY_ARRAY(bankd->comp_id.sw_version, PACKAGE_VERSION); |
| /* FIXME: other members of app_comp_id */ |
| |
| /* Np lock or mutex required for the pcsc_slot_names list, as this is only |
| * read once during bankd initialization, when the worker threads haven't |
| * started yet */ |
| INIT_LLIST_HEAD(&bankd->pcsc_slot_names); |
| OSMO_ASSERT(bankd_pcsc_read_slotnames(bankd, "bankd_pcsc_slots.csv") == 0); |
| |
| /* HACK HACK HACK */ |
| { |
| struct bank_slot bs = { .bank_id = 1, }; |
| struct client_slot cs = { .client_id = 23, }; |
| int i; |
| for (i = 0; i < 5; i++) { |
| bs.slot_nr = cs.slot_nr = i; |
| bankd_slotmap_add(bankd, &bs, &cs); |
| } |
| } |
| } |
| |
| /* create + start a new bankd_worker thread */ |
| static struct bankd_worker *bankd_create_worker(struct bankd *bankd, unsigned int i) |
| { |
| struct bankd_worker *worker; |
| int rc; |
| |
| worker = talloc_zero(bankd, struct bankd_worker); |
| if (!worker) |
| return NULL; |
| |
| worker->bankd = bankd; |
| worker->num = i; |
| |
| /* in the initial state, the worker has no client.fd, bank_slot or pcsc handle yet */ |
| |
| rc = pthread_create(&worker->thread, NULL, worker_main, worker); |
| if (rc != 0) { |
| talloc_free(worker); |
| return NULL; |
| } |
| |
| pthread_mutex_lock(&bankd->workers_mutex); |
| llist_add_tail(&worker->list, &bankd->workers); |
| pthread_mutex_unlock(&bankd->workers_mutex); |
| |
| return worker; |
| } |
| |
| static bool terminate = false; |
| |
| int main(int argc, char **argv) |
| { |
| struct bankd *bankd = talloc_zero(NULL, struct bankd); |
| int i, rc; |
| |
| OSMO_ASSERT(bankd); |
| bankd_init(bankd); |
| |
| /* create listening socket */ |
| rc = osmo_sock_init(AF_INET, SOCK_STREAM, IPPROTO_TCP, NULL, 9999, OSMO_SOCK_F_BIND); |
| if (rc < 0) |
| exit(1); |
| bankd->accept_fd = rc; |
| |
| /* create worker threads. FIXME: one per reader/slot! */ |
| for (i = 0; i < 10; i++) { |
| struct bankd_worker *w; |
| w = bankd_create_worker(bankd, i); |
| if (!w) |
| exit(21); |
| } |
| |
| while (1) { |
| if (terminate) |
| break; |
| /* FIXME: Connect to remsim-server from the main thread, register with |
| * it and await + process any slot mapping or other configuration commands. |
| * Ensure to re-connect as needed. */ |
| |
| /* we should generalize the SRVC (server connection) FSM from remsim-client |
| * and use it here. As long as only the main thread is using osmo_fsm, things |
| * are safe with regard to other threads */ |
| sleep(1); |
| } |
| |
| talloc_free(bankd); |
| exit(0); |
| } |
| |
| |
| |
| /*********************************************************************** |
| * bankd worker thread |
| ***********************************************************************/ |
| |
| struct value_string worker_state_names[] = { |
| { BW_ST_INIT, "INIT" }, |
| { BW_ST_ACCEPTING, "ACCEPTING" }, |
| { BW_ST_CONN_WAIT_ID, "CONN_WAIT_ID" }, |
| { BW_ST_CONN_CLIENT, "CONN_CLIENT" }, |
| { BW_ST_CONN_CLIENT_WAIT_MAP, "CONN_CLIENT_WAIT_MAP" }, |
| { BW_ST_CONN_CLIENT_MAPPED, "CONN_CLIENT_MAPPED" }, |
| { BW_ST_CONN_CLIENT_MAPPED_CARD,"CONN_CLIENT_MAPPED_CARD" }, |
| { 0, NULL } |
| }; |
| |
| #define LOGW(w, fmt, args...) \ |
| printf("[%03u %s] %s:%u " fmt, (w)->num, get_value_string(worker_state_names, (w)->state), \ |
| __FILE__, __LINE__, ## args) |
| |
| #define PCSC_ERROR(w, rv, text) \ |
| if (rv != SCARD_S_SUCCESS) { \ |
| LOGW((w), text ": %s (0x%lX)\n", pcsc_stringify_error(rv), rv); \ |
| goto end; \ |
| } else { \ |
| LOGW((w), ": OK\n"); \ |
| } |
| |
| static void worker_set_state(struct bankd_worker *worker, enum bankd_worker_state new_state) |
| { |
| LOGW(worker, "Changing state to %s\n", get_value_string(worker_state_names, new_state)); |
| worker->state = new_state; |
| worker->timeout = 0; |
| } |
| |
| static void worker_set_state_timeout(struct bankd_worker *worker, enum bankd_worker_state new_state, |
| unsigned int timeout_secs) |
| { |
| LOGW(worker, "Changing state to %s (timeout=%u)\n", |
| get_value_string(worker_state_names, new_state), timeout_secs); |
| worker->state = new_state; |
| worker->timeout = timeout_secs; |
| } |
| |
| static void worker_cleanup(void *arg) |
| { |
| struct bankd_worker *worker = (struct bankd_worker *) arg; |
| struct bankd *bankd = worker->bankd; |
| |
| /* FIXME: should we still do this? in the thread ?!? */ |
| pthread_mutex_lock(&bankd->workers_mutex); |
| llist_del(&worker->list); |
| talloc_free(worker); /* FIXME: is this safe? */ |
| pthread_mutex_unlock(&bankd->workers_mutex); |
| } |
| |
| |
| static int worker_open_card(struct bankd_worker *worker) |
| { |
| long rc; |
| |
| OSMO_ASSERT(worker->state == BW_ST_CONN_CLIENT_MAPPED); |
| |
| if (!worker->reader.name) { |
| /* resolve PC/SC reader name from slot_id -> name map */ |
| worker->reader.name = bankd_pcsc_get_slot_name(worker->bankd, &worker->slot); |
| if (!worker->reader.name) { |
| LOGW(worker, "No PC/SC reader name configured for %u/%u, fix your config\n", |
| worker->slot.bank_id, worker->slot.slot_nr); |
| rc = -1; |
| goto end; |
| } |
| } |
| OSMO_ASSERT(worker->reader.name); |
| |
| if (!worker->reader.pcsc.hContext) { |
| LOGW(worker, "Attempting to open PC/SC context\n"); |
| /* The PC/SC context must be created inside the thread where we'll later use it */ |
| rc = SCardEstablishContext(SCARD_SCOPE_SYSTEM, NULL, NULL, &worker->reader.pcsc.hContext); |
| PCSC_ERROR(worker, rc, "SCardEstablishContext") |
| } |
| |
| if (!worker->reader.pcsc.hCard) { |
| LOGW(worker, "Attempting to open card/slot '%s'\n", worker->reader.name); |
| DWORD dwActiveProtocol; |
| rc = SCardConnect(worker->reader.pcsc.hContext, worker->reader.name, SCARD_SHARE_SHARED, |
| SCARD_PROTOCOL_T0, &worker->reader.pcsc.hCard, &dwActiveProtocol); |
| PCSC_ERROR(worker, rc, "SCardConnect") |
| } |
| |
| worker_set_state(worker, BW_ST_CONN_CLIENT_MAPPED_CARD); |
| /* FIXME: notify client about this state change */ |
| |
| return 0; |
| end: |
| return rc; |
| } |
| |
| |
| static int blocking_ipa_read(int fd, uint8_t *buf, unsigned int buf_size) |
| { |
| struct ipaccess_head *hh; |
| uint16_t len; |
| int needed, rc; |
| |
| if (buf_size < sizeof(*hh)) |
| return -1; |
| |
| hh = (struct ipaccess_head *) buf; |
| |
| /* 1) blocking read from the socket (IPA header) */ |
| rc = read(fd, buf, sizeof(*hh)); |
| if (rc < sizeof(*hh)) |
| return -2; |
| |
| len = ntohs(hh->len); |
| needed = len; //- sizeof(*hh); |
| |
| /* 2) blocking read from the socket (payload) */ |
| rc = read(fd, buf+sizeof(*hh), needed); |
| if (rc < needed) |
| return -3; |
| |
| return len; |
| } |
| |
| static int worker_send_rspro(struct bankd_worker *worker, RsproPDU_t *pdu) |
| { |
| struct msgb *msg = rspro_enc_msg(pdu); |
| int rc; |
| |
| if (!msg) { |
| LOGW(worker, "error encoding RSPRO\n"); |
| return -1; |
| } |
| |
| msg->l2h = msg->data; |
| /* prepend the header */ |
| ipa_prepend_header_ext(msg, IPAC_PROTO_EXT_RSPRO); |
| ipa_prepend_header(msg, IPAC_PROTO_OSMO); |
| |
| /* actually send it through the socket */ |
| rc = write(worker->client.fd, msgb_data(msg), msgb_length(msg)); |
| if (rc == msgb_length(msg)) |
| rc = 0; |
| else { |
| LOGW(worker, "error during write: %d != %d\n", rc, msgb_length(msg)); |
| rc = -1; |
| } |
| |
| msgb_free(msg); |
| |
| return rc; |
| } |
| |
| /* attempt to obtain slot-map */ |
| static int worker_try_slotmap(struct bankd_worker *worker) |
| { |
| struct bankd_slot_mapping *slmap; |
| |
| slmap = bankd_slotmap_by_client(worker->bankd, &worker->client.clslot); |
| if (!slmap) { |
| LOGW(worker, "No slotmap (yet) for client C(%u:%u)\n", |
| worker->client.clslot.client_id, worker->client.clslot.slot_nr); |
| /* check in 10s if the map has been installed meanwhile by main thread */ |
| worker_set_state_timeout(worker, BW_ST_CONN_CLIENT_WAIT_MAP, 10); |
| return -1; |
| } else { |
| LOGW(worker, "slotmap found: C(%u:%u) -> B(%u:%u)\n", |
| slmap->client.client_id, slmap->client.slot_nr, |
| slmap->bank.bank_id, slmap->bank.slot_nr); |
| worker->slot = slmap->bank; |
| worker_set_state_timeout(worker, BW_ST_CONN_CLIENT_MAPPED, 10); |
| return worker_open_card(worker); |
| } |
| } |
| |
| |
| static int worker_handle_connectClientReq(struct bankd_worker *worker, const RsproPDU_t *pdu) |
| { |
| const struct ComponentIdentity *cid = &pdu->msg.choice.connectClientReq.identity; |
| e_ResultCode res; |
| RsproPDU_t *resp; |
| |
| OSMO_ASSERT(pdu->msg.present == RsproPDUchoice_PR_connectClientReq); |
| |
| LOGW(worker, "connectClientReq(T=%lu, N='%s', SW='%s', VER='%s')\n", |
| cid->type, cid->name.buf, cid->software.buf, cid->swVersion.buf); |
| /* FIXME: store somewhere? */ |
| |
| if (worker->state != BW_ST_CONN_WAIT_ID) { |
| LOGW(worker, "Unexpected connectClientReq\n"); |
| return -102; |
| } |
| |
| if (!pdu->msg.choice.connectClientReq.clientSlot) { |
| LOGW(worker, "missing clientID, aborting\n"); |
| return -103; |
| } |
| worker->client.clslot.client_id = pdu->msg.choice.connectClientReq.clientSlot->clientId; |
| worker->client.clslot.slot_nr = pdu->msg.choice.connectClientReq.clientSlot->slotNr; |
| worker_set_state(worker, BW_ST_CONN_CLIENT); |
| |
| if (worker_try_slotmap(worker) >= 0) |
| res = ResultCode_ok; |
| else |
| res = ResultCode_cardNotPresent; |
| |
| resp = rspro_gen_ConnectClientRes(&worker->bankd->comp_id, res); |
| return worker_send_rspro(worker, resp); |
| } |
| |
| static int worker_handle_tpduModemToCard(struct bankd_worker *worker, const RsproPDU_t *pdu) |
| { |
| const struct TpduModemToCard *mdm2sim = &pdu->msg.choice.tpduModemToCard; |
| const SCARD_IO_REQUEST *pioSendPci = SCARD_PCI_T0; |
| SCARD_IO_REQUEST pioRecvPci; |
| uint8_t rx_buf[1024]; |
| DWORD rx_buf_len = sizeof(rx_buf); |
| RsproPDU_t *pdu_resp; |
| long rc; |
| |
| LOGW(worker, "tpduModemToCard(%s)\n", osmo_hexdump_nospc(mdm2sim->data.buf, mdm2sim->data.size)); |
| |
| if (worker->state != BW_ST_CONN_CLIENT_MAPPED_CARD) { |
| LOGW(worker, "Unexpected tpduModemToCaard\n"); |
| return -104; |
| } |
| |
| /* FIXME: Validate that toBankSlot / fromClientSlot match our expectations */ |
| |
| rc = SCardTransmit(worker->reader.pcsc.hCard, |
| pioSendPci, mdm2sim->data.buf, mdm2sim->data.size, |
| &pioRecvPci, rx_buf, &rx_buf_len); |
| PCSC_ERROR(worker, rc, "SCardTransmit"); |
| |
| /* encode response PDU and send it */ |
| pdu_resp = rspro_gen_TpduCard2Modem(&mdm2sim->toBankSlot, &mdm2sim->fromClientSlot, |
| rx_buf, rx_buf_len); |
| worker_send_rspro(worker, pdu_resp); |
| |
| return 0; |
| end: |
| return rc; |
| } |
| |
| /* handle one incoming RSPRO message from a client inside a worker thread */ |
| static int worker_handle_rspro(struct bankd_worker *worker, const RsproPDU_t *pdu) |
| { |
| int rc = -100; |
| |
| switch (pdu->msg.present) { |
| case RsproPDUchoice_PR_connectClientReq: |
| rc = worker_handle_connectClientReq(worker, pdu); |
| break; |
| case RsproPDUchoice_PR_tpduModemToCard: |
| rc = worker_handle_tpduModemToCard(worker, pdu); |
| break; |
| case RsproPDUchoice_PR_clientSlotStatusInd: |
| /* FIXME */ |
| break; |
| default: |
| rc = -101; |
| break; |
| } |
| |
| return rc; |
| } |
| |
| static int wait_for_fd_or_timeout(int fd, unsigned int timeout_secs) |
| { |
| struct timeval tout = { timeout_secs, 0 }; |
| fd_set readset; |
| |
| FD_ZERO(&readset); |
| FD_SET(fd, &readset); |
| return select(fd + 1, &readset, NULL, NULL, timeout_secs ? &tout : NULL); |
| } |
| |
| /* body of the main transceive loop */ |
| static int worker_transceive_loop(struct bankd_worker *worker) |
| { |
| struct ipaccess_head *hh; |
| struct ipaccess_head_ext *hh_ext; |
| uint8_t buf[65536]; /* maximum length expressed in 16bit length field */ |
| asn_dec_rval_t rval; |
| int data_len, rc; |
| RsproPDU_t *pdu = NULL; |
| |
| rc = wait_for_fd_or_timeout(worker->client.fd, worker->timeout); |
| if (rc == 0) { |
| /* TIMEOUT case */ |
| switch (worker->state) { |
| case BW_ST_CONN_CLIENT_WAIT_MAP: |
| /* re-check if mapping exists meanwhile? */ |
| worker_try_slotmap(worker); |
| break; |
| case BW_ST_CONN_CLIENT_MAPPED: |
| /* re-check if reader/card can be opened meanwhile? */ |
| worker_open_card(worker); |
| break; |
| default: |
| OSMO_ASSERT(0); |
| } |
| /* return early, so we do another select rather than the blocking read below */ |
| return 0; |
| }; |
| |
| /* 1) blocking read of entire IPA message from the socket */ |
| rc = blocking_ipa_read(worker->client.fd, buf, sizeof(buf)); |
| if (rc < 0) |
| return rc; |
| data_len = rc; |
| |
| hh = (struct ipaccess_head *) buf; |
| if (hh->proto != IPAC_PROTO_OSMO) { |
| LOGW(worker, "Received unsupported IPA protocol != OSMO: 0x%02x\n", hh->proto); |
| return -4; |
| } |
| |
| hh_ext = (struct ipaccess_head_ext *) buf + sizeof(*hh); |
| if (data_len < sizeof(*hh_ext)) { |
| LOGW(worker, "Received short message\n"); |
| return -5; |
| } |
| data_len -= sizeof(*hh_ext); |
| if (hh_ext->proto != IPAC_PROTO_EXT_RSPRO) { |
| LOGW(worker, "Received unsupported IPA EXT protocol != RSPRO: 0x%02x\n", hh_ext->proto); |
| return -6; |
| } |
| |
| /* 2) ASN1 BER decode of the message */ |
| rval = ber_decode(NULL, &asn_DEF_RsproPDU, (void **) &pdu, hh_ext->data, data_len); |
| if (rval.code != RC_OK) { |
| LOGW(worker, "Error during BER decode of RSPRO\n"); |
| return -7; |
| } |
| |
| /* 3) handling of the message, possibly resulting in PCSC commands */ |
| rc = worker_handle_rspro(worker, pdu); |
| ASN_STRUCT_FREE(asn_DEF_RsproPDU, pdu); |
| if (rc < 0) { |
| LOGW(worker, "Error handling RSPRO\n"); |
| return rc; |
| } |
| |
| /* everything OK if we reach here */ |
| return 0; |
| } |
| |
| /* obtain an ascii representation of the client IP/port */ |
| static int worker_client_addrstr(char *out, unsigned int outlen, const struct bankd_worker *worker) |
| { |
| char hostbuf[32], portbuf[32]; |
| int rc; |
| |
| rc = getnameinfo((const struct sockaddr *)&worker->client.peer_addr, |
| worker->client.peer_addr_len, hostbuf, sizeof(hostbuf), |
| portbuf, sizeof(portbuf), NI_NUMERICHOST | NI_NUMERICSERV); |
| if (rc != 0) { |
| out[0] = '\0'; |
| return -1; |
| } |
| snprintf(out, outlen, "%s:%s", hostbuf, portbuf); |
| return 0; |
| } |
| |
| /* worker thread main function */ |
| static void *worker_main(void *arg) |
| { |
| struct bankd_worker *worker = (struct bankd_worker *) arg; |
| void *top_ctx; |
| int rc; |
| char worker_name[32]; |
| |
| /* set the thread name */ |
| snprintf(worker_name, sizeof(worker_name), "bankd-worker(%u)", worker->num); |
| pthread_setname_np(pthread_self(), worker_name); |
| |
| worker_set_state(worker, BW_ST_INIT); |
| |
| /* not permitted in multithreaded environment */ |
| talloc_disable_null_tracking(); |
| top_ctx = talloc_named_const(NULL, 0, "top"); |
| talloc_asn1_ctx = talloc_named_const(top_ctx, 0, "asn1"); |
| |
| /* push cleanup helper */ |
| pthread_cleanup_push(&worker_cleanup, worker); |
| |
| /* we continuously perform the same loop here, recycling the worker thread |
| * once the client connection is gone or we have some trouble with the card/reader */ |
| while (1) { |
| char buf[128]; |
| |
| worker->client.peer_addr_len = sizeof(worker->client.peer_addr); |
| |
| worker_set_state(worker, BW_ST_ACCEPTING); |
| /* first wait for an incoming TCP connection */ |
| rc = accept(worker->bankd->accept_fd, (struct sockaddr *) &worker->client.peer_addr, |
| &worker->client.peer_addr_len); |
| if (rc < 0) { |
| continue; |
| } |
| worker->client.fd = rc; |
| worker_client_addrstr(buf, sizeof(buf), worker); |
| LOGW(worker, "Accepted connection from %s\n", buf); |
| worker_set_state(worker, BW_ST_CONN_WAIT_ID); |
| |
| /* run the main worker transceive loop body until there was some error */ |
| while (1) { |
| rc = worker_transceive_loop(worker); |
| if (rc < 0) |
| break; |
| } |
| |
| LOGW(worker, "Error %d occurred: Cleaning up state\n", rc); |
| |
| /* clean-up: reset to sane state */ |
| if (worker->reader.pcsc.hCard) { |
| SCardDisconnect(worker->reader.pcsc.hCard, SCARD_UNPOWER_CARD); |
| worker->reader.pcsc.hCard = 0; |
| } |
| if (worker->reader.pcsc.hContext) { |
| SCardReleaseContext(worker->reader.pcsc.hContext); |
| worker->reader.pcsc.hContext = 0; |
| } |
| if (worker->reader.name) |
| worker->reader.name = NULL; |
| if (worker->client.fd >= 0) |
| close(worker->client.fd); |
| memset(&worker->client.peer_addr, 0, sizeof(worker->client.peer_addr)); |
| worker->client.fd = -1; |
| worker->client.clslot.client_id = worker->client.clslot.slot_nr = 0; |
| } |
| |
| pthread_cleanup_pop(1); |
| talloc_free(top_ctx); |
| pthread_exit(NULL); |
| } |