1 /* 2 * iperf, Copyright (c) 2014-2019, The Regents of the University of 3 * California, through Lawrence Berkeley National Laboratory (subject 4 * to receipt of any required approvals from the U.S. Dept. of 5 * Energy). All rights reserved. 6 * 7 * If you have questions about your rights to use or distribute this 8 * software, please contact Berkeley Lab's Technology Transfer 9 * Department at [email protected]. 10 * 11 * NOTICE. This software is owned by the U.S. Department of Energy. 12 * As such, the U.S. Government has been granted for itself and others 13 * acting on its behalf a paid-up, nonexclusive, irrevocable, 14 * worldwide license in the Software to reproduce, prepare derivative 15 * works, and perform publicly and display publicly. Beginning five 16 * (5) years after the date permission to assert copyright is obtained 17 * from the U.S. Department of Energy, and subject to any subsequent 18 * five (5) year renewals, the U.S. Government is granted for itself 19 * and others acting on its behalf a paid-up, nonexclusive, 20 * irrevocable, worldwide license in the Software to reproduce, 21 * prepare derivative works, distribute copies to the public, perform 22 * publicly and display publicly, and to permit others to do so. 23 * 24 * This code is distributed under a BSD style license, see the LICENSE 25 * file for complete information. 26 */ 27 #include "iperf_config.h" 28 29 #include <stdio.h> 30 #include <unistd.h> 31 #include <errno.h> 32 #include <arpa/inet.h> 33 #include <sys/socket.h> 34 #include <sys/types.h> 35 #include <netinet/in.h> 36 #include <netinet/tcp.h> 37 #include <assert.h> 38 #include <netdb.h> 39 #include <string.h> 40 #include <fcntl.h> 41 #include <limits.h> 42 43 #ifdef HAVE_SENDFILE 44 #ifdef linux 45 #include <sys/sendfile.h> 46 #else 47 #ifdef __FreeBSD__ 48 #include <sys/uio.h> 49 #else 50 #if defined(__APPLE__) && defined(__MACH__) /* OS X */ 51 #include <AvailabilityMacros.h> 52 #if defined(MAC_OS_X_VERSION_10_6) 53 #include <sys/uio.h> 54 #endif 55 #endif 56 #endif 57 #endif 58 #endif /* HAVE_SENDFILE */ 59 60 #ifdef HAVE_POLL_H 61 #include <poll.h> 62 #endif /* HAVE_POLL_H */ 63 64 #include "iperf_util.h" 65 #include "net.h" 66 #include "timer.h" 67 68 /* 69 * Declaration of gerror in iperf_error.c. Most other files in iperf3 can get this 70 * by including "iperf.h", but net.c lives "below" this layer. Clearly the 71 * presence of this declaration is a sign we need to revisit this layering. 72 */ 73 extern int gerror; 74 75 /* 76 * timeout_connect adapted from netcat, via OpenBSD and FreeBSD 77 * Copyright (c) 2001 Eric Jackson <[email protected]> 78 */ 79 int 80 timeout_connect(int s, const struct sockaddr *name, socklen_t namelen, 81 int timeout) 82 { 83 struct pollfd pfd; 84 socklen_t optlen; 85 int flags, optval; 86 int ret; 87 88 flags = 0; 89 if (timeout != -1) { 90 flags = fcntl(s, F_GETFL, 0); 91 if (fcntl(s, F_SETFL, flags | O_NONBLOCK) == -1) 92 return -1; 93 } 94 95 if ((ret = connect(s, name, namelen)) != 0 && errno == EINPROGRESS) { 96 pfd.fd = s; 97 pfd.events = POLLOUT; 98 if ((ret = poll(&pfd, 1, timeout)) == 1) { 99 optlen = sizeof(optval); 100 if ((ret = getsockopt(s, SOL_SOCKET, SO_ERROR, 101 &optval, &optlen)) == 0) { 102 errno = optval; 103 ret = optval == 0 ? 0 : -1; 104 } 105 } else if (ret == 0) { 106 errno = ETIMEDOUT; 107 ret = -1; 108 } else 109 ret = -1; 110 } 111 112 if (timeout != -1 && fcntl(s, F_SETFL, flags) == -1) 113 ret = -1; 114 115 return (ret); 116 } 117 118 /* netdial and netannouce code comes from libtask: http://swtch.com/libtask/ 119 * Copyright: http://swtch.com/libtask/COPYRIGHT 120 */ 121 122 /* make connection to server */ 123 int 124 netdial(int domain, int proto, char *local, int local_port, char *server, int port, int timeout) 125 { 126 struct addrinfo hints, *local_res, *server_res; 127 int s, saved_errno; 128 129 if (local) { 130 memset(&hints, 0, sizeof(hints)); 131 hints.ai_family = domain; 132 hints.ai_socktype = proto; 133 if ((gerror = getaddrinfo(local, NULL, &hints, &local_res)) != 0) 134 return -1; 135 } 136 137 memset(&hints, 0, sizeof(hints)); 138 hints.ai_family = domain; 139 hints.ai_socktype = proto; 140 if ((gerror = getaddrinfo(server, NULL, &hints, &server_res)) != 0) 141 return -1; 142 143 s = socket(server_res->ai_family, proto, 0); 144 if (s < 0) { 145 if (local) 146 freeaddrinfo(local_res); 147 freeaddrinfo(server_res); 148 return -1; 149 } 150 151 /* Bind the local address if given a name (with or without --cport) */ 152 if (local) { 153 if (local_port) { 154 struct sockaddr_in *lcladdr; 155 lcladdr = (struct sockaddr_in *)local_res->ai_addr; 156 lcladdr->sin_port = htons(local_port); 157 } 158 159 if (bind(s, (struct sockaddr *) local_res->ai_addr, local_res->ai_addrlen) < 0) { 160 saved_errno = errno; 161 close(s); 162 freeaddrinfo(local_res); 163 freeaddrinfo(server_res); 164 errno = saved_errno; 165 return -1; 166 } 167 freeaddrinfo(local_res); 168 } 169 /* No local name, but --cport given */ 170 else if (local_port) { 171 size_t addrlen; 172 struct sockaddr_storage lcl; 173 174 /* IPv4 */ 175 if (server_res->ai_family == AF_INET) { 176 struct sockaddr_in *lcladdr = (struct sockaddr_in *) &lcl; 177 lcladdr->sin_family = AF_INET; 178 lcladdr->sin_port = htons(local_port); 179 lcladdr->sin_addr.s_addr = INADDR_ANY; 180 addrlen = sizeof(struct sockaddr_in); 181 } 182 /* IPv6 */ 183 else if (server_res->ai_family == AF_INET6) { 184 struct sockaddr_in6 *lcladdr = (struct sockaddr_in6 *) &lcl; 185 lcladdr->sin6_family = AF_INET6; 186 lcladdr->sin6_port = htons(local_port); 187 lcladdr->sin6_addr = in6addr_any; 188 addrlen = sizeof(struct sockaddr_in6); 189 } 190 /* Unknown protocol */ 191 else { 192 errno = EAFNOSUPPORT; 193 return -1; 194 } 195 196 if (bind(s, (struct sockaddr *) &lcl, addrlen) < 0) { 197 saved_errno = errno; 198 close(s); 199 freeaddrinfo(server_res); 200 errno = saved_errno; 201 return -1; 202 } 203 } 204 205 ((struct sockaddr_in *) server_res->ai_addr)->sin_port = htons(port); 206 if (timeout_connect(s, (struct sockaddr *) server_res->ai_addr, server_res->ai_addrlen, timeout) < 0 && errno != EINPROGRESS) { 207 saved_errno = errno; 208 close(s); 209 freeaddrinfo(server_res); 210 errno = saved_errno; 211 return -1; 212 } 213 214 freeaddrinfo(server_res); 215 return s; 216 } 217 218 /***************************************************************/ 219 220 int 221 netannounce(int domain, int proto, char *local, int port) 222 { 223 struct addrinfo hints, *res; 224 char portstr[6]; 225 int s, opt, saved_errno; 226 227 snprintf(portstr, 6, "%d", port); 228 memset(&hints, 0, sizeof(hints)); 229 /* 230 * If binding to the wildcard address with no explicit address 231 * family specified, then force us to get an AF_INET6 socket. On 232 * CentOS 6 and MacOS, getaddrinfo(3) with AF_UNSPEC in ai_family, 233 * and ai_flags containing AI_PASSIVE returns a result structure 234 * with ai_family set to AF_INET, with the result that we create 235 * and bind an IPv4 address wildcard address and by default, we 236 * can't accept IPv6 connections. 237 * 238 * On FreeBSD, under the above circumstances, ai_family in the 239 * result structure is set to AF_INET6. 240 */ 241 if (domain == AF_UNSPEC && !local) { 242 hints.ai_family = AF_INET6; 243 } 244 else { 245 hints.ai_family = domain; 246 } 247 hints.ai_socktype = proto; 248 hints.ai_flags = AI_PASSIVE; 249 if ((gerror = getaddrinfo(local, portstr, &hints, &res)) != 0) 250 return -1; 251 252 s = socket(res->ai_family, proto, 0); 253 if (s < 0) { 254 freeaddrinfo(res); 255 return -1; 256 } 257 258 opt = 1; 259 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 260 (char *) &opt, sizeof(opt)) < 0) { 261 saved_errno = errno; 262 close(s); 263 freeaddrinfo(res); 264 errno = saved_errno; 265 return -1; 266 } 267 /* 268 * If we got an IPv6 socket, figure out if it should accept IPv4 269 * connections as well. We do that if and only if no address 270 * family was specified explicitly. Note that we can only 271 * do this if the IPV6_V6ONLY socket option is supported. Also, 272 * OpenBSD explicitly omits support for IPv4-mapped addresses, 273 * even though it implements IPV6_V6ONLY. 274 */ 275 #if defined(IPV6_V6ONLY) && !defined(__OpenBSD__) 276 if (res->ai_family == AF_INET6 && (domain == AF_UNSPEC || domain == AF_INET6)) { 277 if (domain == AF_UNSPEC) 278 opt = 0; 279 else 280 opt = 1; 281 if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, 282 (char *) &opt, sizeof(opt)) < 0) { 283 saved_errno = errno; 284 close(s); 285 freeaddrinfo(res); 286 errno = saved_errno; 287 return -1; 288 } 289 } 290 #endif /* IPV6_V6ONLY */ 291 292 if (bind(s, (struct sockaddr *) res->ai_addr, res->ai_addrlen) < 0) { 293 saved_errno = errno; 294 close(s); 295 freeaddrinfo(res); 296 errno = saved_errno; 297 return -1; 298 } 299 300 freeaddrinfo(res); 301 302 if (proto == SOCK_STREAM) { 303 if (listen(s, INT_MAX) < 0) { 304 saved_errno = errno; 305 close(s); 306 errno = saved_errno; 307 return -1; 308 } 309 } 310 311 return s; 312 } 313 314 315 /*******************************************************************/ 316 /* reads 'count' bytes from a socket */ 317 /********************************************************************/ 318 319 int 320 Nread(int fd, char *buf, size_t count, int prot) 321 { 322 register ssize_t r; 323 register size_t nleft = count; 324 325 while (nleft > 0) { 326 r = read(fd, buf, nleft); 327 if (r < 0) { 328 if (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK) 329 break; 330 else 331 return NET_HARDERROR; 332 } else if (r == 0) 333 break; 334 335 nleft -= r; 336 buf += r; 337 } 338 return count - nleft; 339 } 340 341 342 /* 343 * N W R I T E 344 */ 345 346 int 347 Nwrite(int fd, const char *buf, size_t count, int prot) 348 { 349 register ssize_t r; 350 register size_t nleft = count; 351 352 while (nleft > 0) { 353 r = write(fd, buf, nleft); 354 if (r < 0) { 355 switch (errno) { 356 case EINTR: 357 case EAGAIN: 358 #if (EAGAIN != EWOULDBLOCK) 359 case EWOULDBLOCK: 360 #endif 361 return count - nleft; 362 363 case ENOBUFS: 364 return NET_SOFTERROR; 365 366 default: 367 return NET_HARDERROR; 368 } 369 } else if (r == 0) 370 return NET_SOFTERROR; 371 nleft -= r; 372 buf += r; 373 } 374 return count; 375 } 376 377 378 int 379 has_sendfile(void) 380 { 381 #if defined(HAVE_SENDFILE) 382 return 1; 383 #else /* HAVE_SENDFILE */ 384 return 0; 385 #endif /* HAVE_SENDFILE */ 386 387 } 388 389 390 /* 391 * N S E N D F I L E 392 */ 393 394 int 395 Nsendfile(int fromfd, int tofd, const char *buf, size_t count) 396 { 397 off_t offset; 398 #if defined(HAVE_SENDFILE) 399 #if defined(__FreeBSD__) || (defined(__APPLE__) && defined(__MACH__) && defined(MAC_OS_X_VERSION_10_6)) 400 off_t sent; 401 #endif 402 register size_t nleft; 403 register ssize_t r; 404 405 nleft = count; 406 while (nleft > 0) { 407 offset = count - nleft; 408 #ifdef linux 409 r = sendfile(tofd, fromfd, &offset, nleft); 410 if (r > 0) 411 nleft -= r; 412 #elif defined(__FreeBSD__) 413 r = sendfile(fromfd, tofd, offset, nleft, NULL, &sent, 0); 414 nleft -= sent; 415 #elif defined(__APPLE__) && defined(__MACH__) && defined(MAC_OS_X_VERSION_10_6) /* OS X */ 416 sent = nleft; 417 r = sendfile(fromfd, tofd, offset, &sent, NULL, 0); 418 nleft -= sent; 419 #else 420 /* Shouldn't happen. */ 421 r = -1; 422 errno = ENOSYS; 423 #endif 424 if (r < 0) { 425 switch (errno) { 426 case EINTR: 427 case EAGAIN: 428 #if (EAGAIN != EWOULDBLOCK) 429 case EWOULDBLOCK: 430 #endif 431 if (count == nleft) 432 return NET_SOFTERROR; 433 return count - nleft; 434 435 case ENOBUFS: 436 case ENOMEM: 437 return NET_SOFTERROR; 438 439 default: 440 return NET_HARDERROR; 441 } 442 } 443 #ifdef linux 444 else if (r == 0) 445 return NET_SOFTERROR; 446 #endif 447 } 448 return count; 449 #else /* HAVE_SENDFILE */ 450 errno = ENOSYS; /* error if somehow get called without HAVE_SENDFILE */ 451 return NET_HARDERROR; 452 #endif /* HAVE_SENDFILE */ 453 } 454 455 /*************************************************************************/ 456 457 int 458 setnonblocking(int fd, int nonblocking) 459 { 460 int flags, newflags; 461 462 flags = fcntl(fd, F_GETFL, 0); 463 if (flags < 0) { 464 perror("fcntl(F_GETFL)"); 465 return -1; 466 } 467 if (nonblocking) 468 newflags = flags | (int) O_NONBLOCK; 469 else 470 newflags = flags & ~((int) O_NONBLOCK); 471 if (newflags != flags) 472 if (fcntl(fd, F_SETFL, newflags) < 0) { 473 perror("fcntl(F_SETFL)"); 474 return -1; 475 } 476 return 0; 477 } 478 479 /****************************************************************************/ 480 481 int 482 getsockdomain(int sock) 483 { 484 struct sockaddr_storage sa; 485 socklen_t len = sizeof(sa); 486 487 if (getsockname(sock, (struct sockaddr *)&sa, &len) < 0) { 488 return -1; 489 } 490 return ((struct sockaddr *) &sa)->sa_family; 491 } 492