Harald Welte | 77911b0 | 2018-08-14 23:47:30 +0200 | [diff] [blame^] | 1 | #include <stdio.h> |
| 2 | #include <stdlib.h> |
| 3 | #include <stdint.h> |
| 4 | #include <unistd.h> |
| 5 | |
| 6 | #include <pthread.h> |
| 7 | |
| 8 | #include <wintypes.h> |
| 9 | #include <winscard.h> |
| 10 | #include <pcsclite.h> |
| 11 | |
| 12 | #include <osmocom/core/linuxlist.h> |
| 13 | |
| 14 | #include <osmocom/gsm/ipa.h> |
| 15 | #include <osmocom/gsm/protocol/ipaccess.h> |
| 16 | |
| 17 | #include <asn1c/asn_application.h> |
| 18 | #include <osmocom/rspro/RsproPDU.h> |
| 19 | |
| 20 | #include "bankd.h" |
| 21 | |
| 22 | __thread void *talloc_asn1_ctx; |
| 23 | |
| 24 | static void *worker_main(void *arg); |
| 25 | |
| 26 | /*********************************************************************** |
| 27 | * bankd core / main thread |
| 28 | ***********************************************************************/ |
| 29 | |
| 30 | static void bankd_init(struct bankd *bankd) |
| 31 | { |
| 32 | /* intialize members of 'bankd' */ |
| 33 | INIT_LLIST_HEAD(&bankd->slot_mappings); |
| 34 | pthread_rwlock_init(&bankd->slot_mappings_rwlock, NULL); |
| 35 | INIT_LLIST_HEAD(&bankd->workers); |
| 36 | pthread_mutex_init(&bankd->workers_mutex, NULL); |
| 37 | } |
| 38 | |
| 39 | /* create + start a new bankd_worker thread */ |
| 40 | static struct bankd_worker *bankd_create_worker(struct bankd *bankd) |
| 41 | { |
| 42 | struct bankd_worker *worker; |
| 43 | int rc; |
| 44 | |
| 45 | worker = talloc_zero(bankd, struct bankd_worker); |
| 46 | if (!worker) |
| 47 | return NULL; |
| 48 | |
| 49 | worker->bankd = bankd; |
| 50 | |
| 51 | /* in the initial state, the worker has no client.fd, bank_slot or pcsc handle yet */ |
| 52 | |
| 53 | rc = pthread_create(&worker->thread, NULL, worker_main, worker); |
| 54 | if (rc != 0) { |
| 55 | talloc_free(worker); |
| 56 | return NULL; |
| 57 | } |
| 58 | |
| 59 | pthread_mutex_lock(&bankd->workers_mutex); |
| 60 | llist_add_tail(&worker->list, &bankd->workers); |
| 61 | pthread_mutex_unlock(&bankd->workers_mutex); |
| 62 | |
| 63 | return worker; |
| 64 | } |
| 65 | |
| 66 | static bool terminate = false; |
| 67 | |
| 68 | int main(int argc, char **argv) |
| 69 | { |
| 70 | struct bankd *bankd = talloc_zero(NULL, struct bankd); |
| 71 | int i, rc; |
| 72 | |
| 73 | OSMO_ASSERT(bankd); |
| 74 | bankd_init(bankd); |
| 75 | |
| 76 | for (i = 0; i < 10; i++) { |
| 77 | struct bankd_worker *w; |
| 78 | w = bankd_create_worker(bankd); |
| 79 | if (!w) |
| 80 | exit(21); |
| 81 | } |
| 82 | |
| 83 | while (1) { |
| 84 | if (terminate) |
| 85 | break; |
| 86 | } |
| 87 | |
| 88 | talloc_free(bankd); |
| 89 | exit(0); |
| 90 | } |
| 91 | |
| 92 | |
| 93 | |
| 94 | /*********************************************************************** |
| 95 | * bankd worker thread |
| 96 | ***********************************************************************/ |
| 97 | |
| 98 | #define PCSC_ERROR(rv, text) \ |
| 99 | if (rv != SCARD_S_SUCCESS) { \ |
| 100 | fprintf(stderr, text ": %s (0x%lX)\n", pcsc_stringify_error(rv), rv); \ |
| 101 | goto end; \ |
| 102 | } else { \ |
| 103 | printf(text ": OK\n\n"); \ |
| 104 | } |
| 105 | |
| 106 | |
| 107 | static void worker_cleanup(void *arg) |
| 108 | { |
| 109 | struct bankd_worker *worker = (struct bankd_worker *) arg; |
| 110 | struct bankd *bankd = worker->bankd; |
| 111 | |
| 112 | /* FIXME: should we still do this? in the thread ?!? */ |
| 113 | pthread_mutex_lock(&bankd->workers_mutex); |
| 114 | llist_del(&worker->list); |
| 115 | talloc_free(worker); /* FIXME: is this safe? */ |
| 116 | pthread_mutex_unlock(&bankd->workers_mutex); |
| 117 | } |
| 118 | |
| 119 | |
| 120 | #if 0 |
| 121 | /* function running inside a worker thread; doing some initialization */ |
| 122 | static void worker_init(struct bankd_worker *worker) |
| 123 | { |
| 124 | int rc; |
| 125 | |
| 126 | /* push cleanup helper */ |
| 127 | pthread_cleanup_push(&worker_cleanup, worker); |
| 128 | |
| 129 | /* The PC/SC context must be created inside the thread where we'll later use it */ |
| 130 | rc = SCardEstablishContext(SCARD_SCOPE_SYSTEM, NULL, NULL, &worker->reader.pcsc.hContext); |
| 131 | PCSC_ERROR(rc, "SCardEstablishContext") |
| 132 | |
| 133 | rc = SCardConnect(worker->reader.pcsc.hContext, worker->reader.name, SCARD_SHARE_SHARED, |
| 134 | SCARD_PROTOCOL_T0, &worker->reader.pcsc.hCard, NULL); |
| 135 | PCSC_ERROR(rc, "SCardConnect") |
| 136 | |
| 137 | return; |
| 138 | end: |
| 139 | pthread_exit(NULL); |
| 140 | } |
| 141 | #endif |
| 142 | |
| 143 | |
| 144 | static int blocking_ipa_read(int fd, uint8_t *buf, unsigned int buf_size) |
| 145 | { |
| 146 | struct ipaccess_head *hh; |
| 147 | uint16_t len; |
| 148 | int needed, rc; |
| 149 | |
| 150 | if (buf_size < sizeof(*hh)) |
| 151 | return -1; |
| 152 | |
| 153 | hh = (struct ipaccess_head *) buf; |
| 154 | |
| 155 | /* 1) blocking read from the socket (IPA header) */ |
| 156 | rc = read(fd, buf, sizeof(*hh)); |
| 157 | if (rc < sizeof(*hh)) |
| 158 | return -2; |
| 159 | |
| 160 | len = ntohs(hh->len); |
| 161 | needed = len; //- sizeof(*hh); |
| 162 | |
| 163 | /* 2) blocking read from the socket (payload) */ |
| 164 | rc = read(fd, buf+sizeof(*hh), needed); |
| 165 | if (rc < needed) |
| 166 | return -3; |
| 167 | |
| 168 | return len; |
| 169 | } |
| 170 | |
| 171 | /* handle one incoming RSPRO message from a client inside a worker thread */ |
| 172 | static int worker_handle_rspro(struct bankd_worker *worker, const RsproPDU_t *pdu) |
| 173 | { |
| 174 | switch (pdu->msg.present) { |
| 175 | case RsproPDUchoice_PR_connectClientReq: |
| 176 | /* FIXME */ |
| 177 | break; |
| 178 | case RsproPDUchoice_PR_tpduModemToCard: |
| 179 | /* FIXME */ |
| 180 | break; |
| 181 | case RsproPDUchoice_PR_clientSlotStatusInd: |
| 182 | /* FIXME */ |
| 183 | break; |
| 184 | default: |
| 185 | return -100; |
| 186 | } |
| 187 | |
| 188 | return 0; |
| 189 | } |
| 190 | |
| 191 | /* body of the main transceive loop */ |
| 192 | static int worker_transceive_loop(struct bankd_worker *worker) |
| 193 | { |
| 194 | struct ipaccess_head *hh; |
| 195 | struct ipaccess_head_ext *hh_ext; |
| 196 | uint8_t buf[65536]; /* maximum length expressed in 16bit length field */ |
| 197 | asn_dec_rval_t rval; |
| 198 | int data_len, rc; |
| 199 | RsproPDU_t *pdu; |
| 200 | |
| 201 | /* 1) blocking read of entire IPA message from the socket */ |
| 202 | rc = blocking_ipa_read(worker->client.fd, buf, sizeof(buf)); |
| 203 | if (rc < 0) |
| 204 | return rc; |
| 205 | data_len = rc; |
| 206 | |
| 207 | hh = (struct ipaccess_head *) buf; |
| 208 | if (hh->proto != IPAC_PROTO_OSMO) |
| 209 | return -4; |
| 210 | |
| 211 | hh_ext = (struct ipaccess_head_ext *) buf + sizeof(*hh); |
| 212 | if (data_len < sizeof(*hh_ext)) |
| 213 | return -5; |
| 214 | data_len -= sizeof(*hh_ext); |
| 215 | if (hh_ext->proto != IPAC_PROTO_EXT_RSPRO) |
| 216 | return -6; |
| 217 | |
| 218 | /* 2) ASN1 BER decode of the message */ |
| 219 | rval = ber_decode(NULL, &asn_DEF_RsproPDU, (void **) &pdu, hh_ext->data, data_len); |
| 220 | if (rval.code != RC_OK) |
| 221 | return -7; |
| 222 | |
| 223 | /* 3) handling of the message, possibly resulting in PCSC commands */ |
| 224 | rc = worker_handle_rspro(worker, pdu); |
| 225 | ASN_STRUCT_FREE(asn_DEF_RsproPDU, pdu); |
| 226 | if (rc < 0) |
| 227 | return rc; |
| 228 | |
| 229 | /* everything OK if we reach here */ |
| 230 | return 0; |
| 231 | } |
| 232 | |
| 233 | /* worker thread main function */ |
| 234 | static void *worker_main(void *arg) |
| 235 | { |
| 236 | struct bankd_worker *worker = (struct bankd_worker *) arg; |
| 237 | void *top_ctx; |
| 238 | int rc; |
| 239 | |
| 240 | /* not permitted in multithreaded environment */ |
| 241 | talloc_disable_null_tracking(); |
| 242 | top_ctx = talloc_named_const(NULL, 0, "top"); |
| 243 | talloc_asn1_ctx = talloc_named_const(top_ctx, 0, "asn1"); |
| 244 | |
| 245 | /* push cleanup helper */ |
| 246 | pthread_cleanup_push(&worker_cleanup, worker); |
| 247 | |
| 248 | /* we continuously perform the same loop here, recycling the worker thread |
| 249 | * once the client connection is gone or we have some trouble with the card/reader */ |
| 250 | while (1) { |
| 251 | worker->client.peer_addr_len = sizeof(worker->client.peer_addr); |
| 252 | |
| 253 | /* first wait for an incoming TCP connection */ |
| 254 | rc = accept(worker->bankd->accept_fd, (struct sockaddr *) &worker->client.peer_addr, |
| 255 | &worker->client.peer_addr_len); |
| 256 | if (rc < 0) { |
| 257 | continue; |
| 258 | } |
| 259 | worker->client.fd = rc; |
| 260 | |
| 261 | /* run the main worker transceive loop body until there was some error */ |
| 262 | while (1) { |
| 263 | rc = worker_transceive_loop(worker); |
| 264 | if (rc < 0) |
| 265 | break; |
| 266 | } |
| 267 | |
| 268 | /* clean-up: reset to sane state */ |
| 269 | if (worker->reader.pcsc.hCard) { |
| 270 | SCardDisconnect(worker->reader.pcsc.hCard, SCARD_UNPOWER_CARD); |
| 271 | worker->reader.pcsc.hCard = 0; |
| 272 | } |
| 273 | if (worker->reader.pcsc.hContext) { |
| 274 | SCardReleaseContext(worker->reader.pcsc.hContext); |
| 275 | worker->reader.pcsc.hContext = 0; |
| 276 | } |
| 277 | if (worker->client.fd >= 0) |
| 278 | close(worker->client.fd); |
| 279 | worker->client.fd = -1; |
| 280 | } |
| 281 | |
| 282 | pthread_cleanup_pop(1); |
| 283 | talloc_free(top_ctx); |
| 284 | pthread_exit(NULL); |
| 285 | } |