Jeremy Kerr | 8e31cfd | 2019-05-07 17:13:51 +0800 | [diff] [blame] | 1 | #define _GNU_SOURCE |
| 2 | |
| 3 | #include <assert.h> |
| 4 | #include <err.h> |
| 5 | #include <getopt.h> |
| 6 | #include <poll.h> |
| 7 | #include <stdio.h> |
| 8 | #include <stdlib.h> |
| 9 | #include <string.h> |
| 10 | #include <unistd.h> |
| 11 | |
| 12 | #include <sys/socket.h> |
| 13 | #include <sys/un.h> |
| 14 | |
| 15 | #include "libmctp.h" |
| 16 | #include "libmctp-serial.h" |
| 17 | #include "libmctp-astlpc.h" |
| 18 | |
| 19 | #define ARRAY_SIZE(a) (sizeof(a) / sizeof(a[0])) |
| 20 | |
| 21 | static const mctp_eid_t local_eid_default = 8; |
| 22 | static char sockname[] = "\0mctp-mux"; |
| 23 | |
| 24 | struct binding { |
| 25 | const char *name; |
| 26 | int (*init)(struct mctp *mctp, struct binding *binding, |
| 27 | mctp_eid_t eid, int n_params, |
| 28 | char * const * params); |
| 29 | int (*get_fd)(struct binding *binding); |
| 30 | int (*process)(struct binding *binding); |
| 31 | void *data; |
| 32 | }; |
| 33 | |
| 34 | struct client { |
| 35 | bool active; |
| 36 | int sock; |
| 37 | uint8_t type; |
| 38 | }; |
| 39 | |
| 40 | struct ctx { |
| 41 | struct mctp *mctp; |
| 42 | struct binding *binding; |
| 43 | bool verbose; |
| 44 | int local_eid; |
| 45 | |
| 46 | int sock; |
| 47 | struct pollfd *pollfds; |
| 48 | |
| 49 | struct client *clients; |
| 50 | int n_clients; |
| 51 | }; |
| 52 | |
| 53 | static void tx_message(struct ctx *ctx, mctp_eid_t eid, void *msg, size_t len) |
| 54 | { |
| 55 | mctp_message_tx(ctx->mctp, eid, msg, len); |
| 56 | } |
| 57 | |
| 58 | static void client_remove_inactive(struct ctx *ctx) |
| 59 | { |
| 60 | int i; |
| 61 | |
| 62 | for (i = 0; i < ctx->n_clients; i++) { |
| 63 | struct client *client = &ctx->clients[i]; |
| 64 | if (client->active) |
| 65 | continue; |
| 66 | close(client->sock); |
| 67 | |
| 68 | ctx->n_clients--; |
| 69 | memmove(&ctx->clients[i], &ctx->clients[i+1], |
| 70 | (ctx->n_clients - i) * sizeof(*ctx->clients)); |
| 71 | ctx->clients = realloc(ctx->clients, |
| 72 | ctx->n_clients * sizeof(*ctx->clients)); |
| 73 | } |
| 74 | } |
| 75 | |
| 76 | static void rx_message(uint8_t eid, void *data, void *msg, size_t len) |
| 77 | { |
| 78 | struct ctx *ctx = data; |
| 79 | struct iovec iov[2]; |
| 80 | struct msghdr msghdr; |
| 81 | bool removed; |
| 82 | uint8_t type; |
| 83 | int i, rc; |
| 84 | |
| 85 | if (len < 2) |
| 86 | return; |
| 87 | |
| 88 | type = *(uint8_t *)msg; |
| 89 | |
| 90 | if (ctx->verbose) |
| 91 | fprintf(stderr, "MCTP message received: len %zd, type %d\n", |
| 92 | len, type); |
| 93 | |
| 94 | memset(&msghdr, 0, sizeof(msghdr)); |
| 95 | msghdr.msg_iov = iov; |
| 96 | msghdr.msg_iovlen = 2; |
| 97 | iov[0].iov_base = &eid; |
| 98 | iov[0].iov_len = 1; |
| 99 | iov[1].iov_base = msg; |
| 100 | iov[1].iov_len = len; |
| 101 | |
| 102 | for (i = 0; i < ctx->n_clients; i++) { |
| 103 | struct client *client = &ctx->clients[i]; |
| 104 | |
| 105 | if (client->type != type) |
| 106 | continue; |
| 107 | |
| 108 | if (ctx->verbose) |
| 109 | fprintf(stderr, " forwarding to client %d\n", i); |
| 110 | |
| 111 | rc = sendmsg(client->sock, &msghdr, 0); |
| 112 | if (rc != (ssize_t)(len + 1)) { |
| 113 | client->active = false; |
| 114 | removed = true; |
| 115 | } |
| 116 | } |
| 117 | |
| 118 | if (removed) |
| 119 | client_remove_inactive(ctx); |
| 120 | |
| 121 | } |
| 122 | |
| 123 | static int binding_serial_init(struct mctp *mctp, struct binding *binding, |
| 124 | mctp_eid_t eid, int n_params, char * const *params) |
| 125 | { |
| 126 | struct mctp_binding_serial *serial; |
| 127 | const char *path; |
| 128 | int rc; |
| 129 | |
| 130 | if (n_params != 1) { |
| 131 | warnx("serial binding requires device param"); |
| 132 | return -1; |
| 133 | } |
| 134 | |
| 135 | path = params[0]; |
| 136 | |
| 137 | serial = mctp_serial_init(); |
| 138 | assert(serial); |
| 139 | |
| 140 | rc = mctp_serial_open_path(serial, path); |
| 141 | if (rc) |
| 142 | return -1; |
| 143 | |
| 144 | mctp_serial_register_bus(serial, mctp, eid); |
| 145 | |
| 146 | binding->data = serial; |
| 147 | |
| 148 | return 0; |
| 149 | } |
| 150 | |
| 151 | static int binding_serial_get_fd(struct binding *binding) |
| 152 | { |
| 153 | return mctp_serial_get_fd(binding->data); |
| 154 | } |
| 155 | |
| 156 | static int binding_serial_process(struct binding *binding) |
| 157 | { |
| 158 | return mctp_serial_read(binding->data); |
| 159 | } |
| 160 | |
| 161 | static int binding_astlpc_init(struct mctp *mctp, struct binding *binding, |
| 162 | mctp_eid_t eid, int n_params, |
| 163 | char * const *params __attribute__((unused))) |
| 164 | { |
| 165 | struct mctp_binding_astlpc *astlpc; |
| 166 | |
| 167 | if (n_params) { |
| 168 | warnx("astlpc binding does not accept parameters"); |
| 169 | return -1; |
| 170 | } |
| 171 | |
| 172 | astlpc = mctp_astlpc_init(); |
| 173 | if (!astlpc) { |
| 174 | warnx("could not initialise astlpc binding"); |
| 175 | return -1; |
| 176 | } |
| 177 | |
| 178 | mctp_astlpc_register_bus(astlpc, mctp, eid); |
| 179 | binding->data = astlpc; |
| 180 | return 0; |
| 181 | } |
| 182 | |
| 183 | static int binding_astlpc_get_fd(struct binding *binding) |
| 184 | { |
| 185 | return mctp_astlpc_get_fd(binding->data); |
| 186 | } |
| 187 | |
| 188 | static int binding_astlpc_process(struct binding *binding) |
| 189 | { |
| 190 | return mctp_astlpc_poll(binding->data); |
| 191 | } |
| 192 | |
| 193 | struct binding bindings[] = { |
| 194 | { |
| 195 | .name = "serial", |
| 196 | .init = binding_serial_init, |
| 197 | .get_fd = binding_serial_get_fd, |
| 198 | .process = binding_serial_process, |
| 199 | }, |
| 200 | { |
| 201 | .name = "astlpc", |
| 202 | .init = binding_astlpc_init, |
| 203 | .get_fd = binding_astlpc_get_fd, |
| 204 | .process = binding_astlpc_process, |
| 205 | } |
| 206 | }; |
| 207 | |
| 208 | struct binding *binding_lookup(const char *name) |
| 209 | { |
| 210 | struct binding *binding; |
| 211 | unsigned int i; |
| 212 | |
| 213 | for (i = 0; i < ARRAY_SIZE(bindings); i++) { |
| 214 | binding = &bindings[i]; |
| 215 | |
| 216 | if (!strcmp(binding->name, name)) |
| 217 | return binding; |
| 218 | } |
| 219 | |
| 220 | return NULL; |
| 221 | } |
| 222 | |
| 223 | static int socket_init(struct ctx *ctx) |
| 224 | { |
| 225 | struct sockaddr_un addr; |
| 226 | int namelen, rc; |
| 227 | |
| 228 | namelen = sizeof(sockname) - 1; |
| 229 | addr.sun_family = AF_UNIX; |
| 230 | memcpy(addr.sun_path, sockname, namelen); |
| 231 | |
| 232 | ctx->sock = socket(AF_UNIX, SOCK_SEQPACKET, 0); |
| 233 | if (ctx->sock < 0) { |
| 234 | warn("can't create socket"); |
| 235 | return -1; |
| 236 | } |
| 237 | |
| 238 | rc = bind(ctx->sock, (struct sockaddr *)&addr, |
| 239 | sizeof(addr.sun_family) + namelen); |
| 240 | if (rc) { |
| 241 | warn("can't bind socket"); |
| 242 | goto err_close; |
| 243 | } |
| 244 | |
| 245 | rc = listen(ctx->sock, 1); |
| 246 | if (rc) { |
| 247 | warn("can't listen on socket"); |
| 248 | goto err_close; |
| 249 | } |
| 250 | |
| 251 | return 0; |
| 252 | |
| 253 | err_close: |
| 254 | close(ctx->sock); |
| 255 | return -1; |
| 256 | } |
| 257 | |
| 258 | static int socket_process(struct ctx *ctx) |
| 259 | { |
| 260 | struct client *client; |
| 261 | int fd; |
| 262 | |
| 263 | fd = accept4(ctx->sock, NULL, 0, SOCK_NONBLOCK); |
| 264 | if (fd < 0) |
| 265 | return -1; |
| 266 | |
| 267 | ctx->n_clients++; |
| 268 | ctx->clients = realloc(ctx->clients, |
| 269 | ctx->n_clients * sizeof(struct client)); |
| 270 | |
| 271 | client = &ctx->clients[ctx->n_clients-1]; |
| 272 | memset(client, 0, sizeof(client)); |
| 273 | client->active = true; |
| 274 | client->sock = fd; |
| 275 | |
| 276 | return 0; |
| 277 | } |
| 278 | |
| 279 | static int client_process_recv(struct ctx *ctx, int idx) |
| 280 | { |
| 281 | struct client *client = &ctx->clients[idx]; |
| 282 | uint8_t buf[4096]; |
| 283 | int rc; |
| 284 | |
| 285 | /* are we waiting for a type message? */ |
| 286 | if (!client->type) { |
| 287 | uint8_t type; |
| 288 | rc = read(client->sock, &type, 1); |
| 289 | if (rc <= 0) |
| 290 | goto out_close; |
| 291 | |
| 292 | if (type == 0) { |
| 293 | rc = -1; |
| 294 | goto out_close; |
| 295 | } |
| 296 | if (ctx->verbose) |
| 297 | fprintf(stderr, "client[%d] registered for type %u\n", |
| 298 | idx, type); |
| 299 | client->type = type; |
| 300 | return 0; |
| 301 | } |
| 302 | |
| 303 | /* todo: size detection through MSG_TRUNC or MSG_PEEK */ |
| 304 | rc = recv(client->sock, buf, sizeof(buf), 0); |
| 305 | if (rc < 0) { |
| 306 | warn("can't receive from client"); |
| 307 | goto out_close; |
| 308 | } |
| 309 | |
| 310 | if (rc == 0) { |
| 311 | rc = -1; |
| 312 | goto out_close; |
| 313 | } |
| 314 | |
| 315 | if (rc > 0) { |
| 316 | uint8_t eid = buf[0]; |
| 317 | if (ctx->verbose) |
| 318 | fprintf(stderr, |
| 319 | "client[%d] sent message: dest 0x%02x len %d\n", |
| 320 | idx, eid, rc - 1); |
| 321 | |
| 322 | tx_message(ctx, eid, buf + 1, rc - 1); |
| 323 | } |
| 324 | |
| 325 | return 0; |
| 326 | |
| 327 | out_close: |
| 328 | client->active = false; |
| 329 | return rc; |
| 330 | } |
| 331 | |
| 332 | static int binding_init(struct ctx *ctx, const char *name, |
| 333 | int argc, char * const *argv) |
| 334 | { |
| 335 | int rc; |
| 336 | |
| 337 | ctx->binding = binding_lookup(name); |
| 338 | if (!ctx->binding) { |
| 339 | warnx("no such binding '%s'", name); |
| 340 | return -1; |
| 341 | } |
| 342 | |
| 343 | rc = ctx->binding->init(ctx->mctp, ctx->binding, ctx->local_eid, |
| 344 | argc, argv); |
| 345 | return rc; |
| 346 | } |
| 347 | |
| 348 | enum { |
| 349 | FD_BINDING = 0, |
| 350 | FD_SOCKET, |
| 351 | FD_NR, |
| 352 | }; |
| 353 | |
| 354 | static int run_daemon(struct ctx *ctx) |
| 355 | { |
| 356 | bool clients_changed = false; |
| 357 | int rc, i; |
| 358 | |
| 359 | ctx->pollfds = malloc(FD_NR * sizeof(struct pollfd)); |
| 360 | |
| 361 | ctx->pollfds[FD_BINDING].fd = |
| 362 | ctx->binding->get_fd(ctx->binding); |
| 363 | ctx->pollfds[FD_BINDING].events = POLLIN; |
| 364 | |
| 365 | ctx->pollfds[FD_SOCKET].fd = ctx->sock; |
| 366 | ctx->pollfds[FD_SOCKET].events = POLLIN; |
| 367 | |
| 368 | mctp_set_rx_all(ctx->mctp, rx_message, ctx); |
| 369 | |
| 370 | for (;;) { |
| 371 | if (clients_changed) { |
| 372 | int i; |
| 373 | |
| 374 | ctx->pollfds = realloc(ctx->pollfds, |
| 375 | (ctx->n_clients + FD_NR) * |
| 376 | sizeof(struct pollfd)); |
| 377 | |
| 378 | for (i = 0; i < ctx->n_clients; i++) { |
| 379 | ctx->pollfds[FD_NR+i].fd = |
| 380 | ctx->clients[i].sock; |
| 381 | ctx->pollfds[FD_NR+i].events = POLLIN; |
| 382 | } |
| 383 | clients_changed = false; |
| 384 | } |
| 385 | |
| 386 | rc = poll(ctx->pollfds, ctx->n_clients + FD_NR, -1); |
| 387 | if (rc < 0) { |
| 388 | warn("poll failed"); |
| 389 | break; |
| 390 | } |
| 391 | |
| 392 | if (!rc) |
| 393 | continue; |
| 394 | |
| 395 | if (ctx->pollfds[FD_BINDING].revents) { |
| 396 | rc = ctx->binding->process(ctx->binding); |
| 397 | if (rc) |
| 398 | break; |
| 399 | } |
| 400 | |
| 401 | for (i = 0; i < ctx->n_clients; i++) { |
| 402 | if (!ctx->pollfds[FD_NR+i].revents) |
| 403 | continue; |
| 404 | |
| 405 | rc = client_process_recv(ctx, i); |
| 406 | if (rc) |
| 407 | clients_changed = true; |
| 408 | } |
| 409 | |
| 410 | if (ctx->pollfds[FD_SOCKET].revents) { |
| 411 | rc = socket_process(ctx); |
| 412 | if (rc) |
| 413 | break; |
| 414 | clients_changed = true; |
| 415 | } |
| 416 | |
| 417 | if (clients_changed) |
| 418 | client_remove_inactive(ctx); |
| 419 | |
| 420 | } |
| 421 | |
| 422 | |
| 423 | free(ctx->pollfds); |
| 424 | |
| 425 | return rc; |
| 426 | } |
| 427 | |
| 428 | static const struct option options[] = { |
| 429 | { "verbose", no_argument, 0, 'v' }, |
| 430 | { "eid", required_argument, 0, 'e' }, |
| 431 | { 0 }, |
| 432 | }; |
| 433 | |
| 434 | static void usage(const char *progname) |
| 435 | { |
| 436 | unsigned int i; |
| 437 | |
| 438 | fprintf(stderr, "usage: %s <binding> [params]\n", progname); |
| 439 | fprintf(stderr, "Available bindings:\n"); |
| 440 | for (i = 0; i < ARRAY_SIZE(bindings); i++) |
| 441 | fprintf(stderr, " %s\n", bindings[i].name); |
| 442 | } |
| 443 | |
| 444 | int main(int argc, char * const *argv) |
| 445 | { |
| 446 | struct ctx *ctx, _ctx; |
| 447 | int rc; |
| 448 | |
| 449 | ctx = &_ctx; |
| 450 | ctx->clients = NULL; |
| 451 | ctx->n_clients = 0; |
| 452 | ctx->local_eid = local_eid_default; |
| 453 | |
| 454 | for (;;) { |
| 455 | rc = getopt_long(argc, argv, "e:v", options, NULL); |
| 456 | if (rc == -1) |
| 457 | break; |
| 458 | switch (rc) { |
| 459 | case 'v': |
| 460 | ctx->verbose = true; |
| 461 | break; |
| 462 | case 'e': |
| 463 | ctx->local_eid = atoi(optarg); |
| 464 | break; |
| 465 | default: |
| 466 | fprintf(stderr, "Invalid argument\n"); |
| 467 | return EXIT_FAILURE; |
| 468 | } |
| 469 | } |
| 470 | |
| 471 | if (optind >= argc) { |
| 472 | fprintf(stderr, "missing binding argument\n"); |
| 473 | usage(argv[0]); |
| 474 | return EXIT_FAILURE; |
| 475 | } |
| 476 | |
| 477 | ctx->mctp = mctp_init(); |
| 478 | assert(ctx->mctp); |
| 479 | |
| 480 | rc = binding_init(ctx, argv[optind], argc - optind - 1, argv + optind + 1); |
| 481 | if (rc) |
| 482 | return EXIT_FAILURE; |
| 483 | |
| 484 | rc = socket_init(ctx); |
| 485 | if (rc) |
| 486 | return EXIT_FAILURE; |
| 487 | |
| 488 | rc = run_daemon(ctx); |
| 489 | |
| 490 | return rc ? EXIT_FAILURE : EXIT_SUCCESS; |
| 491 | |
| 492 | } |