Willy Tarreau | 84393aa | 2016-11-12 11:29:46 +0100 | [diff] [blame^] | 1 | #include <sys/resource.h> |
| 2 | #include <sys/select.h> |
| 3 | #include <sys/types.h> |
| 4 | #include <sys/socket.h> |
| 5 | #include <sys/stat.h> |
| 6 | #include <sys/time.h> |
| 7 | #include <sys/ioctl.h> |
| 8 | #include <arpa/inet.h> |
| 9 | #include <netinet/in.h> |
| 10 | #include <netinet/tcp.h> |
| 11 | |
| 12 | #include <ctype.h> |
| 13 | #include <errno.h> |
| 14 | #include <fcntl.h> |
| 15 | #include <netdb.h> |
| 16 | #include <poll.h> |
| 17 | #include <signal.h> |
| 18 | #include <stdarg.h> |
| 19 | #include <stdio.h> |
| 20 | #include <stdlib.h> |
| 21 | #include <string.h> |
| 22 | #include <time.h> |
| 23 | #include <unistd.h> |
| 24 | |
| 25 | |
| 26 | struct err_msg { |
| 27 | int size; |
| 28 | int len; |
| 29 | char msg[0]; |
| 30 | }; |
| 31 | |
| 32 | const int zero = 0; |
| 33 | const int one = 1; |
| 34 | const struct linger nolinger = { .l_onoff = 1, .l_linger = 0 }; |
| 35 | |
| 36 | #define TRASH_SIZE 65536 |
| 37 | static char trash[TRASH_SIZE]; |
| 38 | |
| 39 | /* display the message and exit with the code */ |
| 40 | __attribute__((noreturn)) void die(int code, const char *format, ...) |
| 41 | { |
| 42 | va_list args; |
| 43 | |
| 44 | va_start(args, format); |
| 45 | vfprintf(stderr, format, args); |
| 46 | va_end(args); |
| 47 | exit(code); |
| 48 | } |
| 49 | |
| 50 | /* display the usage message and exit with the code */ |
| 51 | __attribute__((noreturn)) void usage(int code, const char *arg0) |
| 52 | { |
| 53 | die(code, "Usage: %s [<ip>:]port [action*]\n", arg0); |
| 54 | } |
| 55 | |
| 56 | struct err_msg *alloc_err_msg(int size) |
| 57 | { |
| 58 | struct err_msg *err; |
| 59 | |
| 60 | err = malloc(sizeof(*err) + size); |
| 61 | if (err) { |
| 62 | err->len = 0; |
| 63 | err->size = size; |
| 64 | } |
| 65 | return err; |
| 66 | } |
| 67 | |
| 68 | |
| 69 | /* converts str in the form [[<ipv4>|<ipv6>|<hostname>]:]port to struct sockaddr_storage. |
| 70 | * Returns < 0 with err set in case of error. |
| 71 | */ |
| 72 | int addr_to_ss(char *str, struct sockaddr_storage *ss, struct err_msg *err) |
| 73 | { |
| 74 | char *port_str; |
| 75 | int port; |
| 76 | |
| 77 | memset(ss, 0, sizeof(*ss)); |
| 78 | |
| 79 | /* look for the addr/port delimiter, it's the last colon. If there's no |
| 80 | * colon, it's 0:<port>. |
| 81 | */ |
| 82 | if ((port_str = strrchr(str, ':')) == NULL) { |
| 83 | port = atoi(str); |
| 84 | if (port <= 0 || port > 65535) { |
| 85 | err->len = snprintf(err->msg, err->size, "Missing/invalid port number: '%s'\n", str); |
| 86 | return -1; |
| 87 | } |
| 88 | |
| 89 | ss->ss_family = AF_INET; |
| 90 | ((struct sockaddr_in *)ss)->sin_port = htons(port); |
| 91 | ((struct sockaddr_in *)ss)->sin_addr.s_addr = INADDR_ANY; |
| 92 | return 0; |
| 93 | } |
| 94 | |
| 95 | *port_str++ = 0; |
| 96 | |
| 97 | if (strrchr(str, ':') != NULL) { |
| 98 | /* IPv6 address contains ':' */ |
| 99 | ss->ss_family = AF_INET6; |
| 100 | ((struct sockaddr_in6 *)ss)->sin6_port = htons(atoi(port_str)); |
| 101 | |
| 102 | if (!inet_pton(ss->ss_family, str, &((struct sockaddr_in6 *)ss)->sin6_addr)) { |
| 103 | err->len = snprintf(err->msg, err->size, "Invalid server address: '%s'\n", str); |
| 104 | return -1; |
| 105 | } |
| 106 | } |
| 107 | else { |
| 108 | ss->ss_family = AF_INET; |
| 109 | ((struct sockaddr_in *)ss)->sin_port = htons(atoi(port_str)); |
| 110 | |
| 111 | if (*str == '*' || *str == '\0') { /* INADDR_ANY */ |
| 112 | ((struct sockaddr_in *)ss)->sin_addr.s_addr = INADDR_ANY; |
| 113 | return 0; |
| 114 | } |
| 115 | |
| 116 | if (!inet_pton(ss->ss_family, str, &((struct sockaddr_in *)ss)->sin_addr)) { |
| 117 | struct hostent *he = gethostbyname(str); |
| 118 | |
| 119 | if (he == NULL) { |
| 120 | err->len = snprintf(err->msg, err->size, "Invalid server name: '%s'\n", str); |
| 121 | return -1; |
| 122 | } |
| 123 | ((struct sockaddr_in *)ss)->sin_addr = *(struct in_addr *) *(he->h_addr_list); |
| 124 | } |
| 125 | } |
| 126 | |
| 127 | return 0; |
| 128 | } |
| 129 | |
| 130 | /* waits up to one second on fd <fd> for events <events> (POLLIN|POLLOUT). |
| 131 | * returns poll's status. |
| 132 | */ |
| 133 | int wait_on_fd(int fd, int events) |
| 134 | { |
| 135 | struct pollfd pollfd; |
| 136 | int ret; |
| 137 | |
| 138 | do { |
| 139 | pollfd.fd = fd; |
| 140 | pollfd.events = events; |
| 141 | ret = poll(&pollfd, 1, 1000); |
| 142 | } while (ret == -1 && errno == EINTR); |
| 143 | |
| 144 | return ret; |
| 145 | } |
| 146 | |
| 147 | int tcp_set_nodelay(int sock, const char *arg) |
| 148 | { |
| 149 | return setsockopt(sock, SOL_TCP, TCP_NODELAY, &one, sizeof(one)); |
| 150 | } |
| 151 | |
| 152 | int tcp_set_nolinger(int sock, const char *arg) |
| 153 | { |
| 154 | return setsockopt(sock, SOL_SOCKET, SO_LINGER, (struct linger *) &nolinger, sizeof(struct linger)); |
| 155 | } |
| 156 | |
| 157 | int tcp_set_noquickack(int sock, const char *arg) |
| 158 | { |
| 159 | /* warning: do not use during connect if nothing is to be sent! */ |
| 160 | return setsockopt(sock, SOL_TCP, TCP_QUICKACK, &zero, sizeof(zero)); |
| 161 | } |
| 162 | |
| 163 | /* Try to listen to address <sa>. Return the fd or -1 in case of error */ |
| 164 | int tcp_listen(const struct sockaddr_storage *sa, const char *arg) |
| 165 | { |
| 166 | int sock; |
| 167 | int backlog; |
| 168 | |
| 169 | if (arg[1]) |
| 170 | backlog = atoi(arg + 1); |
| 171 | else |
| 172 | backlog = 1000; |
| 173 | |
| 174 | if (backlog < 0 || backlog > 65535) { |
| 175 | fprintf(stderr, "backlog must be between 0 and 65535 inclusive (was %d)\n", backlog); |
| 176 | return -1; |
| 177 | } |
| 178 | |
| 179 | sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); |
| 180 | if (sock < 0) { |
| 181 | perror("socket()"); |
| 182 | return -1; |
| 183 | } |
| 184 | |
| 185 | if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)) == -1) { |
| 186 | perror("setsockopt(SO_REUSEADDR)"); |
| 187 | goto fail; |
| 188 | } |
| 189 | |
| 190 | #ifdef SO_REUSEPORT |
| 191 | if (setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, (char *) &one, sizeof(one)) == -1) { |
| 192 | perror("setsockopt(SO_REUSEPORT)"); |
| 193 | goto fail; |
| 194 | } |
| 195 | #endif |
| 196 | if (bind(sock, (struct sockaddr *)sa, sa->ss_family == AF_INET6 ? |
| 197 | sizeof(struct sockaddr_in6) : sizeof(struct sockaddr_in)) == -1) { |
| 198 | perror("bind"); |
| 199 | goto fail; |
| 200 | } |
| 201 | |
| 202 | if (listen(sock, backlog) == -1) { |
| 203 | perror("listen"); |
| 204 | goto fail; |
| 205 | } |
| 206 | |
| 207 | return sock; |
| 208 | fail: |
| 209 | close(sock); |
| 210 | return -1; |
| 211 | } |
| 212 | |
| 213 | /* accepts a socket from listening socket <sock>, and returns it (or -1 in case of error) */ |
| 214 | int tcp_accept(int sock, const char *arg) |
| 215 | { |
| 216 | int count; |
| 217 | int newsock; |
| 218 | |
| 219 | if (arg[1]) |
| 220 | count = atoi(arg + 1); |
| 221 | else |
| 222 | count = 1; |
| 223 | |
| 224 | if (count <= 0) { |
| 225 | fprintf(stderr, "accept count must be > 0 or unset (was %d)\n", count); |
| 226 | return -1; |
| 227 | } |
| 228 | |
| 229 | do { |
| 230 | newsock = accept(sock, NULL, NULL); |
| 231 | if (newsock < 0) { // TODO: improve error handling |
| 232 | if (errno == EINTR || errno == EAGAIN || errno == ECONNABORTED) |
| 233 | continue; |
| 234 | perror("accept()"); |
| 235 | break; |
| 236 | } |
| 237 | |
| 238 | if (count > 1) |
| 239 | close(newsock); |
| 240 | count--; |
| 241 | } while (count > 0); |
| 242 | |
| 243 | fcntl(newsock, F_SETFL, O_NONBLOCK); |
| 244 | return newsock; |
| 245 | } |
| 246 | |
| 247 | /* Try to establish a new connection to <sa>. Return the fd or -1 in case of error */ |
| 248 | int tcp_connect(const struct sockaddr_storage *sa, const char *arg) |
| 249 | { |
| 250 | int sock; |
| 251 | |
| 252 | sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); |
| 253 | if (sock < 0) |
| 254 | return -1; |
| 255 | |
| 256 | if (fcntl(sock, F_SETFL, O_NONBLOCK) == -1) |
| 257 | goto fail; |
| 258 | |
| 259 | if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)) == -1) |
| 260 | goto fail; |
| 261 | |
| 262 | if (connect(sock, (const struct sockaddr *)sa, sizeof(*sa)) < 0) { |
| 263 | if (errno != EINPROGRESS) |
| 264 | goto fail; |
| 265 | } |
| 266 | |
| 267 | return sock; |
| 268 | fail: |
| 269 | close(sock); |
| 270 | return -1; |
| 271 | } |
| 272 | |
| 273 | /* receives N bytes from the socket and returns 0 (or -1 in case of error). |
| 274 | * When no arg is passed, receives anything and stops. Otherwise reads the |
| 275 | * requested amount of data. 0 means read as much as possible. |
| 276 | */ |
| 277 | int tcp_recv(int sock, const char *arg) |
| 278 | { |
| 279 | int count = -1; // stop at first read |
| 280 | int ret; |
| 281 | |
| 282 | if (arg[1]) { |
| 283 | count = atoi(arg + 1); |
| 284 | if (count < 0) { |
| 285 | fprintf(stderr, "recv count must be >= 0 or unset (was %d)\n", count); |
| 286 | return -1; |
| 287 | } |
| 288 | } |
| 289 | |
| 290 | while (1) { |
| 291 | ret = recv(sock, NULL, (count > 0) ? count : INT_MAX, MSG_NOSIGNAL | MSG_TRUNC); |
| 292 | if (ret < 0) { |
| 293 | if (errno == EINTR) |
| 294 | continue; |
| 295 | if (errno != EAGAIN) |
| 296 | return -1; |
| 297 | while (!wait_on_fd(sock, POLLIN)); |
| 298 | continue; |
| 299 | } |
| 300 | if (!ret) |
| 301 | break; |
| 302 | |
| 303 | if (!count) |
| 304 | continue; |
| 305 | else if (count > 0) |
| 306 | count -= ret; |
| 307 | |
| 308 | if (count <= 0) |
| 309 | break; |
| 310 | } |
| 311 | |
| 312 | return 0; |
| 313 | } |
| 314 | |
| 315 | /* sends N bytes to the socket and returns 0 (or -1 in case of error). If not |
| 316 | * set, sends only one block. Sending zero means try to send forever. |
| 317 | */ |
| 318 | int tcp_send(int sock, const char *arg) |
| 319 | { |
| 320 | int count = -1; // stop after first block |
| 321 | int ret; |
| 322 | |
| 323 | if (arg[1]) { |
| 324 | count = atoi(arg + 1); |
| 325 | if (count <= 0) { |
| 326 | fprintf(stderr, "send count must be >= 0 or unset (was %d)\n", count); |
| 327 | return -1; |
| 328 | } |
| 329 | } |
| 330 | |
| 331 | while (1) { |
| 332 | ret = send(sock, trash, |
| 333 | (count > 0) && (count < sizeof(trash)) ? count : sizeof(trash), |
| 334 | MSG_NOSIGNAL | ((count > sizeof(trash)) ? MSG_MORE : 0)); |
| 335 | if (ret < 0) { |
| 336 | if (errno == EINTR) |
| 337 | continue; |
| 338 | if (errno != EAGAIN) |
| 339 | return -1; |
| 340 | while (!wait_on_fd(sock, POLLOUT)); |
| 341 | continue; |
| 342 | } |
| 343 | if (!count) |
| 344 | continue; |
| 345 | else if (count > 0) |
| 346 | count -= ret; |
| 347 | |
| 348 | if (count <= 0) |
| 349 | break; |
| 350 | } |
| 351 | |
| 352 | return 0; |
| 353 | } |
| 354 | |
| 355 | /* echoes N bytes to the socket and returns 0 (or -1 in case of error). If not |
| 356 | * set, echoes only the first block. Zero means forward forever. |
| 357 | */ |
| 358 | int tcp_echo(int sock, const char *arg) |
| 359 | { |
| 360 | int count = -1; // echo forever |
| 361 | int ret; |
| 362 | int rcvd; |
| 363 | |
| 364 | if (arg[1]) { |
| 365 | count = atoi(arg + 1); |
| 366 | if (count < 0) { |
| 367 | fprintf(stderr, "send count must be >= 0 or unset (was %d)\n", count); |
| 368 | return -1; |
| 369 | } |
| 370 | } |
| 371 | |
| 372 | rcvd = 0; |
| 373 | while (1) { |
| 374 | if (rcvd <= 0) { |
| 375 | /* no data pending */ |
| 376 | rcvd = recv(sock, trash, (count > 0) && (count < sizeof(trash)) ? count : sizeof(trash), MSG_NOSIGNAL); |
| 377 | if (rcvd < 0) { |
| 378 | if (errno == EINTR) |
| 379 | continue; |
| 380 | if (errno != EAGAIN) |
| 381 | return -1; |
| 382 | while (!wait_on_fd(sock, POLLIN)); |
| 383 | continue; |
| 384 | } |
| 385 | if (!rcvd) |
| 386 | break; |
| 387 | } |
| 388 | else { |
| 389 | /* some data still pending */ |
| 390 | ret = send(sock, trash, rcvd, MSG_NOSIGNAL | ((count > rcvd) ? MSG_MORE : 0)); |
| 391 | if (ret < 0) { |
| 392 | if (errno == EINTR) |
| 393 | continue; |
| 394 | if (errno != EAGAIN) |
| 395 | return -1; |
| 396 | while (!wait_on_fd(sock, POLLOUT)); |
| 397 | continue; |
| 398 | } |
| 399 | rcvd -= ret; |
| 400 | if (rcvd) |
| 401 | continue; |
| 402 | |
| 403 | if (!count) |
| 404 | continue; |
| 405 | else if (count > 0) |
| 406 | count -= ret; |
| 407 | |
| 408 | if (count <= 0) |
| 409 | break; |
| 410 | } |
| 411 | } |
| 412 | return 0; |
| 413 | } |
| 414 | |
| 415 | /* waits for an event on the socket, usually indicates an accept for a |
| 416 | * listening socket and a connect for an outgoing socket. |
| 417 | */ |
| 418 | int tcp_wait(int sock, const char *arg) |
| 419 | { |
| 420 | struct pollfd pollfd; |
| 421 | int delay = -1; // wait forever |
| 422 | int ret; |
| 423 | |
| 424 | if (arg[1]) { |
| 425 | delay = atoi(arg + 1); |
| 426 | if (delay < 0) { |
| 427 | fprintf(stderr, "wait time must be >= 0 or unset (was %d)\n", delay); |
| 428 | return -1; |
| 429 | } |
| 430 | } |
| 431 | |
| 432 | /* FIXME: this doesn't take into account delivered signals */ |
| 433 | do { |
| 434 | pollfd.fd = sock; |
| 435 | pollfd.events = POLLIN | POLLOUT; |
| 436 | ret = poll(&pollfd, 1, delay); |
| 437 | } while (ret == -1 && errno == EINTR); |
| 438 | |
| 439 | return 0; |
| 440 | } |
| 441 | |
| 442 | /* waits for the input data to be present */ |
| 443 | int tcp_wait_in(int sock, const char *arg) |
| 444 | { |
| 445 | struct pollfd pollfd; |
| 446 | int ret; |
| 447 | |
| 448 | do { |
| 449 | pollfd.fd = sock; |
| 450 | pollfd.events = POLLIN; |
| 451 | ret = poll(&pollfd, 1, 1000); |
| 452 | } while (ret == -1 && errno == EINTR); |
| 453 | return 0; |
| 454 | } |
| 455 | |
| 456 | /* waits for the output queue to be empty */ |
| 457 | int tcp_wait_out(int sock, const char *arg) |
| 458 | { |
| 459 | struct pollfd pollfd; |
| 460 | int ret; |
| 461 | |
| 462 | do { |
| 463 | pollfd.fd = sock; |
| 464 | pollfd.events = POLLOUT; |
| 465 | ret = poll(&pollfd, 1, 1000); |
| 466 | } while (ret == -1 && errno == EINTR); |
| 467 | |
| 468 | /* Now wait for data to leave the socket */ |
| 469 | do { |
| 470 | if (ioctl(sock, TIOCOUTQ, &ret) < 0) |
| 471 | return -1; |
| 472 | } while (ret > 0); |
| 473 | return 0; |
| 474 | } |
| 475 | |
| 476 | /* delays processing for <time> milliseconds, 100 by default */ |
| 477 | int tcp_pause(int sock, const char *arg) |
| 478 | { |
| 479 | struct pollfd pollfd; |
| 480 | int delay = 100; |
| 481 | int ret; |
| 482 | |
| 483 | if (arg[1]) { |
| 484 | delay = atoi(arg + 1); |
| 485 | if (delay < 0) { |
| 486 | fprintf(stderr, "wait time must be >= 0 or unset (was %d)\n", delay); |
| 487 | return -1; |
| 488 | } |
| 489 | } |
| 490 | |
| 491 | usleep(delay * 1000); |
| 492 | return 0; |
| 493 | } |
| 494 | |
| 495 | int main(int argc, char **argv) |
| 496 | { |
| 497 | struct sockaddr_storage ss; |
| 498 | struct err_msg err; |
| 499 | const char *arg0; |
| 500 | int arg; |
| 501 | int sock; |
| 502 | |
| 503 | arg0 = argv[0]; |
| 504 | if (argc < 2) |
| 505 | usage(1, arg0); |
| 506 | |
| 507 | if (addr_to_ss(argv[1], &ss, &err) < 0) |
| 508 | die(1, "%s\n", err.msg); |
| 509 | |
| 510 | sock = -1; |
| 511 | for (arg = 2; arg < argc; arg++) { |
| 512 | switch (argv[arg][0]) { |
| 513 | case 'L': |
| 514 | /* silently ignore existing connections */ |
| 515 | if (sock == -1) |
| 516 | sock = tcp_listen(&ss, argv[arg]); |
| 517 | if (sock < 0) |
| 518 | die(1, "Fatal: tcp_listen() failed.\n"); |
| 519 | break; |
| 520 | |
| 521 | case 'C': |
| 522 | /* silently ignore existing connections */ |
| 523 | if (sock == -1) |
| 524 | sock = tcp_connect(&ss, argv[arg]); |
| 525 | if (sock < 0) |
| 526 | die(1, "Fatal: tcp_connect() failed.\n"); |
| 527 | break; |
| 528 | |
| 529 | case 'A': |
| 530 | if (sock < 0) |
| 531 | die(1, "Fatal: tcp_accept() on non-socket.\n"); |
| 532 | sock = tcp_accept(sock, argv[arg]); |
| 533 | if (sock < 0) |
| 534 | die(1, "Fatal: tcp_accept() failed.\n"); |
| 535 | break; |
| 536 | |
| 537 | case 'T': |
| 538 | if (sock < 0) |
| 539 | die(1, "Fatal: tcp_set_nodelay() on non-socket.\n"); |
| 540 | if (tcp_set_nodelay(sock, argv[arg]) < 0) |
| 541 | die(1, "Fatal: tcp_set_nodelay() failed.\n"); |
| 542 | break; |
| 543 | |
| 544 | case 'G': |
| 545 | if (sock < 0) |
| 546 | die(1, "Fatal: tcp_set_nolinger() on non-socket.\n"); |
| 547 | if (tcp_set_nolinger(sock, argv[arg]) < 0) |
| 548 | die(1, "Fatal: tcp_set_nolinger() failed.\n"); |
| 549 | break; |
| 550 | |
| 551 | case 'Q': |
| 552 | if (sock < 0) |
| 553 | die(1, "Fatal: tcp_set_noquickack() on non-socket.\n"); |
| 554 | if (tcp_set_noquickack(sock, argv[arg]) < 0) |
| 555 | die(1, "Fatal: tcp_set_noquickack() failed.\n"); |
| 556 | break; |
| 557 | |
| 558 | case 'R': |
| 559 | if (sock < 0) |
| 560 | die(1, "Fatal: tcp_recv() on non-socket.\n"); |
| 561 | if (tcp_recv(sock, argv[arg]) < 0) |
| 562 | die(1, "Fatal: tcp_recv() failed.\n"); |
| 563 | break; |
| 564 | |
| 565 | case 'S': |
| 566 | if (sock < 0) |
| 567 | die(1, "Fatal: tcp_send() on non-socket.\n"); |
| 568 | if (tcp_send(sock, argv[arg]) < 0) |
| 569 | die(1, "Fatal: tcp_send() failed.\n"); |
| 570 | break; |
| 571 | |
| 572 | case 'E': |
| 573 | if (sock < 0) |
| 574 | die(1, "Fatal: tcp_echo() on non-socket.\n"); |
| 575 | if (tcp_echo(sock, argv[arg]) < 0) |
| 576 | die(1, "Fatal: tcp_echo() failed.\n"); |
| 577 | break; |
| 578 | |
| 579 | case 'P': |
| 580 | if (tcp_pause(sock, argv[arg]) < 0) |
| 581 | die(1, "Fatal: tcp_pause() failed.\n"); |
| 582 | break; |
| 583 | |
| 584 | case 'W': |
| 585 | if (sock < 0) |
| 586 | die(1, "Fatal: tcp_wait() on non-socket.\n"); |
| 587 | if (tcp_wait(sock, argv[arg]) < 0) |
| 588 | die(1, "Fatal: tcp_wait() failed.\n"); |
| 589 | break; |
| 590 | |
| 591 | case 'I': |
| 592 | if (sock < 0) |
| 593 | die(1, "Fatal: tcp_wait_in() on non-socket.\n"); |
| 594 | if (tcp_wait_in(sock, argv[arg]) < 0) |
| 595 | die(1, "Fatal: tcp_wait_in() failed.\n"); |
| 596 | break; |
| 597 | |
| 598 | case 'O': |
| 599 | if (sock < 0) |
| 600 | die(1, "Fatal: tcp_wait_out() on non-socket.\n"); |
| 601 | if (tcp_wait_out(sock, argv[arg]) < 0) |
| 602 | die(1, "Fatal: tcp_wait_out() failed.\n"); |
| 603 | break; |
| 604 | |
| 605 | case 'K': |
| 606 | if (sock < 0 || close(sock) < 0) |
| 607 | die(1, "Fatal: close() on non-socket.\n"); |
| 608 | sock = -1; |
| 609 | break; |
| 610 | |
| 611 | case 'F': |
| 612 | /* ignore errors on shutdown() as they are common */ |
| 613 | if (sock >= 0) |
| 614 | shutdown(sock, SHUT_WR); |
| 615 | break; |
| 616 | |
| 617 | default: |
| 618 | usage(1, arg0); |
| 619 | } |
| 620 | } |
| 621 | return 0; |
| 622 | } |