Damien Miller | 293cac5 | 2014-12-22 16:30:42 +1100 | [diff] [blame] | 1 | /* $OpenBSD: netcat.c,v 1.126 2014/10/30 16:08:31 tedu Exp $ */ |
| 2 | /* |
| 3 | * Copyright (c) 2001 Eric Jackson <ericj@monkey.org> |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * |
| 9 | * 1. Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * 2. Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
| 14 | * 3. The name of the author may not be used to endorse or promote products |
| 15 | * derived from this software without specific prior written permission. |
| 16 | * |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | */ |
| 28 | |
| 29 | /* |
| 30 | * Re-written nc(1) for OpenBSD. Original implementation by |
| 31 | * *Hobbit* <hobbit@avian.org>. |
| 32 | */ |
| 33 | |
| 34 | #include "includes.h" |
| 35 | |
| 36 | #include <sys/types.h> |
| 37 | #include <sys/socket.h> |
| 38 | #include <sys/time.h> |
| 39 | #include <sys/uio.h> |
| 40 | #include <sys/un.h> |
| 41 | |
| 42 | #include <netinet/in.h> |
| 43 | #include <netinet/tcp.h> |
| 44 | #include <netinet/ip.h> |
| 45 | #include <arpa/telnet.h> |
| 46 | |
Damien Miller | 293cac5 | 2014-12-22 16:30:42 +1100 | [diff] [blame] | 47 | #include <errno.h> |
| 48 | #include <netdb.h> |
| 49 | #include <poll.h> |
| 50 | #include <stdarg.h> |
| 51 | #include <stdio.h> |
| 52 | #include <stdlib.h> |
| 53 | #include <string.h> |
| 54 | #include <unistd.h> |
| 55 | #include <fcntl.h> |
| 56 | #include <limits.h> |
| 57 | #include "atomicio.h" |
| 58 | |
| 59 | #ifndef SUN_LEN |
| 60 | #define SUN_LEN(su) \ |
| 61 | (sizeof(*(su)) - sizeof((su)->sun_path) + strlen((su)->sun_path)) |
| 62 | #endif |
| 63 | |
| 64 | #define PORT_MAX 65535 |
| 65 | #define PORT_MAX_LEN 6 |
| 66 | #define UNIX_DG_TMP_SOCKET_SIZE 19 |
| 67 | |
| 68 | #define POLL_STDIN 0 |
| 69 | #define POLL_NETOUT 1 |
| 70 | #define POLL_NETIN 2 |
| 71 | #define POLL_STDOUT 3 |
| 72 | #define BUFSIZE 16384 |
| 73 | |
| 74 | /* Command Line Options */ |
| 75 | int dflag; /* detached, no stdin */ |
| 76 | int Fflag; /* fdpass sock to stdout */ |
| 77 | unsigned int iflag; /* Interval Flag */ |
| 78 | int kflag; /* More than one connect */ |
| 79 | int lflag; /* Bind to local port */ |
| 80 | int Nflag; /* shutdown() network socket */ |
| 81 | int nflag; /* Don't do name look up */ |
| 82 | char *Pflag; /* Proxy username */ |
| 83 | char *pflag; /* Localport flag */ |
| 84 | int rflag; /* Random ports flag */ |
| 85 | char *sflag; /* Source Address */ |
| 86 | int tflag; /* Telnet Emulation */ |
| 87 | int uflag; /* UDP - Default to TCP */ |
| 88 | int vflag; /* Verbosity */ |
| 89 | int xflag; /* Socks proxy */ |
| 90 | int zflag; /* Port Scan Flag */ |
| 91 | int Dflag; /* sodebug */ |
| 92 | int Iflag; /* TCP receive buffer size */ |
| 93 | int Oflag; /* TCP send buffer size */ |
| 94 | int Sflag; /* TCP MD5 signature option */ |
| 95 | int Tflag = -1; /* IP Type of Service */ |
| 96 | int rtableid = -1; |
| 97 | |
| 98 | int timeout = -1; |
| 99 | int family = AF_UNSPEC; |
| 100 | char *portlist[PORT_MAX+1]; |
| 101 | char *unix_dg_tmp_socket; |
| 102 | |
| 103 | void atelnet(int, unsigned char *, unsigned int); |
| 104 | void build_ports(char *); |
| 105 | void help(void); |
| 106 | int local_listen(char *, char *, struct addrinfo); |
| 107 | void readwrite(int); |
| 108 | void fdpass(int nfd) __attribute__((noreturn)); |
| 109 | int remote_connect(const char *, const char *, struct addrinfo); |
| 110 | int timeout_connect(int, const struct sockaddr *, socklen_t); |
| 111 | int socks_connect(const char *, const char *, struct addrinfo, |
| 112 | const char *, const char *, struct addrinfo, int, const char *); |
| 113 | int udptest(int); |
| 114 | int unix_bind(char *); |
| 115 | int unix_connect(char *); |
| 116 | int unix_listen(char *); |
| 117 | void set_common_sockopts(int); |
| 118 | int map_tos(char *, int *); |
| 119 | void report_connect(const struct sockaddr *, socklen_t); |
| 120 | void usage(int); |
| 121 | ssize_t drainbuf(int, unsigned char *, size_t *); |
| 122 | ssize_t fillbuf(int, unsigned char *, size_t *); |
| 123 | |
Tim Rice | 13af342 | 2015-02-24 07:56:47 -0800 | [diff] [blame^] | 124 | static void err(int, const char *, ...) __attribute__((format(printf, 2, 3))); |
| 125 | static void errx(int, const char *, ...) __attribute__((format(printf, 2, 3))); |
| 126 | static void warn(const char *, ...) __attribute__((format(printf, 1, 2))); |
| 127 | |
| 128 | static void |
| 129 | err(int r, const char *fmt, ...) |
| 130 | { |
| 131 | va_list args; |
| 132 | |
| 133 | va_start(args, fmt); |
| 134 | fprintf(stderr, "%s: ", strerror(errno)); |
| 135 | vfprintf(stderr, fmt, args); |
| 136 | fputc('\n', stderr); |
| 137 | va_end(args); |
| 138 | exit(r); |
| 139 | } |
| 140 | |
| 141 | static void |
| 142 | errx(int r, const char *fmt, ...) |
| 143 | { |
| 144 | va_list args; |
| 145 | |
| 146 | va_start(args, fmt); |
| 147 | vfprintf(stderr, fmt, args); |
| 148 | fputc('\n', stderr); |
| 149 | va_end(args); |
| 150 | exit(r); |
| 151 | } |
| 152 | |
| 153 | static void |
| 154 | warn(const char *fmt, ...) |
| 155 | { |
| 156 | va_list args; |
| 157 | |
| 158 | va_start(args, fmt); |
| 159 | fprintf(stderr, "%s: ", strerror(errno)); |
| 160 | vfprintf(stderr, fmt, args); |
| 161 | fputc('\n', stderr); |
| 162 | va_end(args); |
| 163 | } |
| 164 | |
Damien Miller | 293cac5 | 2014-12-22 16:30:42 +1100 | [diff] [blame] | 165 | int |
| 166 | main(int argc, char *argv[]) |
| 167 | { |
| 168 | int ch, s, ret, socksv; |
| 169 | char *host, *uport; |
| 170 | struct addrinfo hints; |
| 171 | struct servent *sv; |
| 172 | socklen_t len; |
| 173 | struct sockaddr_storage cliaddr; |
| 174 | char *proxy = NULL; |
| 175 | const char *errstr, *proxyhost = "", *proxyport = NULL; |
| 176 | struct addrinfo proxyhints; |
| 177 | char unix_dg_tmp_socket_buf[UNIX_DG_TMP_SOCKET_SIZE]; |
| 178 | |
| 179 | ret = 1; |
| 180 | s = 0; |
| 181 | socksv = 5; |
| 182 | host = NULL; |
| 183 | uport = NULL; |
| 184 | sv = NULL; |
| 185 | |
| 186 | while ((ch = getopt(argc, argv, |
| 187 | "46DdFhI:i:klNnO:P:p:rSs:tT:UuV:vw:X:x:z")) != -1) { |
| 188 | switch (ch) { |
| 189 | case '4': |
| 190 | family = AF_INET; |
| 191 | break; |
| 192 | case '6': |
| 193 | family = AF_INET6; |
| 194 | break; |
| 195 | case 'U': |
| 196 | family = AF_UNIX; |
| 197 | break; |
| 198 | case 'X': |
| 199 | if (strcasecmp(optarg, "connect") == 0) |
| 200 | socksv = -1; /* HTTP proxy CONNECT */ |
| 201 | else if (strcmp(optarg, "4") == 0) |
| 202 | socksv = 4; /* SOCKS v.4 */ |
| 203 | else if (strcmp(optarg, "5") == 0) |
| 204 | socksv = 5; /* SOCKS v.5 */ |
| 205 | else |
| 206 | errx(1, "unsupported proxy protocol"); |
| 207 | break; |
| 208 | case 'd': |
| 209 | dflag = 1; |
| 210 | break; |
| 211 | case 'F': |
| 212 | Fflag = 1; |
| 213 | break; |
| 214 | case 'h': |
| 215 | help(); |
| 216 | break; |
| 217 | case 'i': |
| 218 | iflag = strtonum(optarg, 0, UINT_MAX, &errstr); |
| 219 | if (errstr) |
| 220 | errx(1, "interval %s: %s", errstr, optarg); |
| 221 | break; |
| 222 | case 'k': |
| 223 | kflag = 1; |
| 224 | break; |
| 225 | case 'l': |
| 226 | lflag = 1; |
| 227 | break; |
| 228 | case 'N': |
| 229 | Nflag = 1; |
| 230 | break; |
| 231 | case 'n': |
| 232 | nflag = 1; |
| 233 | break; |
| 234 | case 'P': |
| 235 | Pflag = optarg; |
| 236 | break; |
| 237 | case 'p': |
| 238 | pflag = optarg; |
| 239 | break; |
| 240 | case 'r': |
| 241 | rflag = 1; |
| 242 | break; |
| 243 | case 's': |
| 244 | sflag = optarg; |
| 245 | break; |
| 246 | case 't': |
| 247 | tflag = 1; |
| 248 | break; |
| 249 | case 'u': |
| 250 | uflag = 1; |
| 251 | break; |
| 252 | #ifdef SO_RTABLE |
| 253 | case 'V': |
| 254 | rtableid = (int)strtonum(optarg, 0, |
| 255 | RT_TABLEID_MAX, &errstr); |
| 256 | if (errstr) |
| 257 | errx(1, "rtable %s: %s", errstr, optarg); |
| 258 | break; |
| 259 | #endif |
| 260 | case 'v': |
| 261 | vflag = 1; |
| 262 | break; |
| 263 | case 'w': |
| 264 | timeout = strtonum(optarg, 0, INT_MAX / 1000, &errstr); |
| 265 | if (errstr) |
| 266 | errx(1, "timeout %s: %s", errstr, optarg); |
| 267 | timeout *= 1000; |
| 268 | break; |
| 269 | case 'x': |
| 270 | xflag = 1; |
| 271 | if ((proxy = strdup(optarg)) == NULL) |
| 272 | err(1, NULL); |
| 273 | break; |
| 274 | case 'z': |
| 275 | zflag = 1; |
| 276 | break; |
| 277 | case 'D': |
| 278 | Dflag = 1; |
| 279 | break; |
| 280 | case 'I': |
| 281 | Iflag = strtonum(optarg, 1, 65536 << 14, &errstr); |
| 282 | if (errstr != NULL) |
| 283 | errx(1, "TCP receive window %s: %s", |
| 284 | errstr, optarg); |
| 285 | break; |
| 286 | case 'O': |
| 287 | Oflag = strtonum(optarg, 1, 65536 << 14, &errstr); |
| 288 | if (errstr != NULL) |
| 289 | errx(1, "TCP send window %s: %s", |
| 290 | errstr, optarg); |
| 291 | break; |
| 292 | case 'S': |
| 293 | Sflag = 1; |
| 294 | break; |
| 295 | case 'T': |
| 296 | errstr = NULL; |
| 297 | errno = 0; |
| 298 | if (map_tos(optarg, &Tflag)) |
| 299 | break; |
| 300 | if (strlen(optarg) > 1 && optarg[0] == '0' && |
| 301 | optarg[1] == 'x') |
| 302 | Tflag = (int)strtol(optarg, NULL, 16); |
| 303 | else |
| 304 | Tflag = (int)strtonum(optarg, 0, 255, |
| 305 | &errstr); |
| 306 | if (Tflag < 0 || Tflag > 255 || errstr || errno) |
| 307 | errx(1, "illegal tos value %s", optarg); |
| 308 | break; |
| 309 | default: |
| 310 | usage(1); |
| 311 | } |
| 312 | } |
| 313 | argc -= optind; |
| 314 | argv += optind; |
| 315 | |
| 316 | /* Cruft to make sure options are clean, and used properly. */ |
| 317 | if (argv[0] && !argv[1] && family == AF_UNIX) { |
| 318 | host = argv[0]; |
| 319 | uport = NULL; |
| 320 | } else if (argv[0] && !argv[1]) { |
| 321 | if (!lflag) |
| 322 | usage(1); |
| 323 | uport = argv[0]; |
| 324 | host = NULL; |
| 325 | } else if (argv[0] && argv[1]) { |
| 326 | host = argv[0]; |
| 327 | uport = argv[1]; |
| 328 | } else |
| 329 | usage(1); |
| 330 | |
| 331 | if (lflag && sflag) |
| 332 | errx(1, "cannot use -s and -l"); |
| 333 | if (lflag && pflag) |
| 334 | errx(1, "cannot use -p and -l"); |
| 335 | if (lflag && zflag) |
| 336 | errx(1, "cannot use -z and -l"); |
| 337 | if (!lflag && kflag) |
| 338 | errx(1, "must use -l with -k"); |
| 339 | |
| 340 | /* Get name of temporary socket for unix datagram client */ |
| 341 | if ((family == AF_UNIX) && uflag && !lflag) { |
| 342 | if (sflag) { |
| 343 | unix_dg_tmp_socket = sflag; |
| 344 | } else { |
| 345 | strlcpy(unix_dg_tmp_socket_buf, "/tmp/nc.XXXXXXXXXX", |
| 346 | UNIX_DG_TMP_SOCKET_SIZE); |
| 347 | if (mktemp(unix_dg_tmp_socket_buf) == NULL) |
| 348 | err(1, "mktemp"); |
| 349 | unix_dg_tmp_socket = unix_dg_tmp_socket_buf; |
| 350 | } |
| 351 | } |
| 352 | |
| 353 | /* Initialize addrinfo structure. */ |
| 354 | if (family != AF_UNIX) { |
| 355 | memset(&hints, 0, sizeof(struct addrinfo)); |
| 356 | hints.ai_family = family; |
| 357 | hints.ai_socktype = uflag ? SOCK_DGRAM : SOCK_STREAM; |
| 358 | hints.ai_protocol = uflag ? IPPROTO_UDP : IPPROTO_TCP; |
| 359 | if (nflag) |
| 360 | hints.ai_flags |= AI_NUMERICHOST; |
| 361 | } |
| 362 | |
| 363 | if (xflag) { |
| 364 | if (uflag) |
| 365 | errx(1, "no proxy support for UDP mode"); |
| 366 | |
| 367 | if (lflag) |
| 368 | errx(1, "no proxy support for listen"); |
| 369 | |
| 370 | if (family == AF_UNIX) |
| 371 | errx(1, "no proxy support for unix sockets"); |
| 372 | |
| 373 | /* XXX IPv6 transport to proxy would probably work */ |
| 374 | if (family == AF_INET6) |
| 375 | errx(1, "no proxy support for IPv6"); |
| 376 | |
| 377 | if (sflag) |
| 378 | errx(1, "no proxy support for local source address"); |
| 379 | |
| 380 | proxyhost = strsep(&proxy, ":"); |
| 381 | proxyport = proxy; |
| 382 | |
| 383 | memset(&proxyhints, 0, sizeof(struct addrinfo)); |
| 384 | proxyhints.ai_family = family; |
| 385 | proxyhints.ai_socktype = SOCK_STREAM; |
| 386 | proxyhints.ai_protocol = IPPROTO_TCP; |
| 387 | if (nflag) |
| 388 | proxyhints.ai_flags |= AI_NUMERICHOST; |
| 389 | } |
| 390 | |
| 391 | if (lflag) { |
| 392 | int connfd; |
| 393 | ret = 0; |
| 394 | |
| 395 | if (family == AF_UNIX) { |
| 396 | if (uflag) |
| 397 | s = unix_bind(host); |
| 398 | else |
| 399 | s = unix_listen(host); |
| 400 | } |
| 401 | |
| 402 | /* Allow only one connection at a time, but stay alive. */ |
| 403 | for (;;) { |
| 404 | if (family != AF_UNIX) |
| 405 | s = local_listen(host, uport, hints); |
| 406 | if (s < 0) |
| 407 | err(1, NULL); |
| 408 | /* |
| 409 | * For UDP and -k, don't connect the socket, let it |
| 410 | * receive datagrams from multiple socket pairs. |
| 411 | */ |
| 412 | if (uflag && kflag) |
| 413 | readwrite(s); |
| 414 | /* |
| 415 | * For UDP and not -k, we will use recvfrom() initially |
| 416 | * to wait for a caller, then use the regular functions |
| 417 | * to talk to the caller. |
| 418 | */ |
| 419 | else if (uflag && !kflag) { |
| 420 | int rv, plen; |
| 421 | char buf[16384]; |
| 422 | struct sockaddr_storage z; |
| 423 | |
| 424 | len = sizeof(z); |
| 425 | plen = 2048; |
| 426 | rv = recvfrom(s, buf, plen, MSG_PEEK, |
| 427 | (struct sockaddr *)&z, &len); |
| 428 | if (rv < 0) |
| 429 | err(1, "recvfrom"); |
| 430 | |
| 431 | rv = connect(s, (struct sockaddr *)&z, len); |
| 432 | if (rv < 0) |
| 433 | err(1, "connect"); |
| 434 | |
| 435 | if (vflag) |
| 436 | report_connect((struct sockaddr *)&z, len); |
| 437 | |
| 438 | readwrite(s); |
| 439 | } else { |
| 440 | len = sizeof(cliaddr); |
| 441 | connfd = accept(s, (struct sockaddr *)&cliaddr, |
| 442 | &len); |
| 443 | if (connfd == -1) { |
| 444 | /* For now, all errnos are fatal */ |
| 445 | err(1, "accept"); |
| 446 | } |
| 447 | if (vflag) |
| 448 | report_connect((struct sockaddr *)&cliaddr, len); |
| 449 | |
| 450 | readwrite(connfd); |
| 451 | close(connfd); |
| 452 | } |
| 453 | |
| 454 | if (family != AF_UNIX) |
| 455 | close(s); |
| 456 | else if (uflag) { |
| 457 | if (connect(s, NULL, 0) < 0) |
| 458 | err(1, "connect"); |
| 459 | } |
| 460 | |
| 461 | if (!kflag) |
| 462 | break; |
| 463 | } |
| 464 | } else if (family == AF_UNIX) { |
| 465 | ret = 0; |
| 466 | |
| 467 | if ((s = unix_connect(host)) > 0 && !zflag) { |
| 468 | readwrite(s); |
| 469 | close(s); |
| 470 | } else |
| 471 | ret = 1; |
| 472 | |
| 473 | if (uflag) |
| 474 | unlink(unix_dg_tmp_socket); |
| 475 | exit(ret); |
| 476 | |
| 477 | } else { |
| 478 | int i = 0; |
| 479 | |
| 480 | /* Construct the portlist[] array. */ |
| 481 | build_ports(uport); |
| 482 | |
| 483 | /* Cycle through portlist, connecting to each port. */ |
| 484 | for (i = 0; portlist[i] != NULL; i++) { |
| 485 | if (s) |
| 486 | close(s); |
| 487 | |
| 488 | if (xflag) |
| 489 | s = socks_connect(host, portlist[i], hints, |
| 490 | proxyhost, proxyport, proxyhints, socksv, |
| 491 | Pflag); |
| 492 | else |
| 493 | s = remote_connect(host, portlist[i], hints); |
| 494 | |
| 495 | if (s < 0) |
| 496 | continue; |
| 497 | |
| 498 | ret = 0; |
| 499 | if (vflag || zflag) { |
| 500 | /* For UDP, make sure we are connected. */ |
| 501 | if (uflag) { |
| 502 | if (udptest(s) == -1) { |
| 503 | ret = 1; |
| 504 | continue; |
| 505 | } |
| 506 | } |
| 507 | |
| 508 | /* Don't look up port if -n. */ |
| 509 | if (nflag) |
| 510 | sv = NULL; |
| 511 | else { |
| 512 | sv = getservbyport( |
| 513 | ntohs(atoi(portlist[i])), |
| 514 | uflag ? "udp" : "tcp"); |
| 515 | } |
| 516 | |
| 517 | fprintf(stderr, |
| 518 | "Connection to %s %s port [%s/%s] " |
| 519 | "succeeded!\n", host, portlist[i], |
| 520 | uflag ? "udp" : "tcp", |
| 521 | sv ? sv->s_name : "*"); |
| 522 | } |
| 523 | if (Fflag) |
| 524 | fdpass(s); |
| 525 | else if (!zflag) |
| 526 | readwrite(s); |
| 527 | } |
| 528 | } |
| 529 | |
| 530 | if (s) |
| 531 | close(s); |
| 532 | |
| 533 | exit(ret); |
| 534 | } |
| 535 | |
| 536 | /* |
| 537 | * unix_bind() |
| 538 | * Returns a unix socket bound to the given path |
| 539 | */ |
| 540 | int |
| 541 | unix_bind(char *path) |
| 542 | { |
Tim Rice | 13af342 | 2015-02-24 07:56:47 -0800 | [diff] [blame^] | 543 | struct sockaddr_un sun_sa; |
Damien Miller | 293cac5 | 2014-12-22 16:30:42 +1100 | [diff] [blame] | 544 | int s; |
| 545 | |
| 546 | /* Create unix domain socket. */ |
| 547 | if ((s = socket(AF_UNIX, uflag ? SOCK_DGRAM : SOCK_STREAM, |
| 548 | 0)) < 0) |
| 549 | return (-1); |
| 550 | |
Tim Rice | 13af342 | 2015-02-24 07:56:47 -0800 | [diff] [blame^] | 551 | memset(&sun_sa, 0, sizeof(struct sockaddr_un)); |
| 552 | sun_sa.sun_family = AF_UNIX; |
Damien Miller | 293cac5 | 2014-12-22 16:30:42 +1100 | [diff] [blame] | 553 | |
Tim Rice | 13af342 | 2015-02-24 07:56:47 -0800 | [diff] [blame^] | 554 | if (strlcpy(sun_sa.sun_path, path, sizeof(sun_sa.sun_path)) >= |
| 555 | sizeof(sun_sa.sun_path)) { |
Damien Miller | 293cac5 | 2014-12-22 16:30:42 +1100 | [diff] [blame] | 556 | close(s); |
| 557 | errno = ENAMETOOLONG; |
| 558 | return (-1); |
| 559 | } |
| 560 | |
Tim Rice | 13af342 | 2015-02-24 07:56:47 -0800 | [diff] [blame^] | 561 | if (bind(s, (struct sockaddr *)&sun_sa, SUN_LEN(&sun_sa)) < 0) { |
Damien Miller | 293cac5 | 2014-12-22 16:30:42 +1100 | [diff] [blame] | 562 | close(s); |
| 563 | return (-1); |
| 564 | } |
| 565 | return (s); |
| 566 | } |
| 567 | |
| 568 | /* |
| 569 | * unix_connect() |
| 570 | * Returns a socket connected to a local unix socket. Returns -1 on failure. |
| 571 | */ |
| 572 | int |
| 573 | unix_connect(char *path) |
| 574 | { |
Tim Rice | 13af342 | 2015-02-24 07:56:47 -0800 | [diff] [blame^] | 575 | struct sockaddr_un sun_sa; |
Damien Miller | 293cac5 | 2014-12-22 16:30:42 +1100 | [diff] [blame] | 576 | int s; |
| 577 | |
| 578 | if (uflag) { |
| 579 | if ((s = unix_bind(unix_dg_tmp_socket)) < 0) |
| 580 | return (-1); |
| 581 | } else { |
| 582 | if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) |
| 583 | return (-1); |
| 584 | } |
| 585 | (void)fcntl(s, F_SETFD, FD_CLOEXEC); |
| 586 | |
Tim Rice | 13af342 | 2015-02-24 07:56:47 -0800 | [diff] [blame^] | 587 | memset(&sun_sa, 0, sizeof(struct sockaddr_un)); |
| 588 | sun_sa.sun_family = AF_UNIX; |
Damien Miller | 293cac5 | 2014-12-22 16:30:42 +1100 | [diff] [blame] | 589 | |
Tim Rice | 13af342 | 2015-02-24 07:56:47 -0800 | [diff] [blame^] | 590 | if (strlcpy(sun_sa.sun_path, path, sizeof(sun_sa.sun_path)) >= |
| 591 | sizeof(sun_sa.sun_path)) { |
Damien Miller | 293cac5 | 2014-12-22 16:30:42 +1100 | [diff] [blame] | 592 | close(s); |
| 593 | errno = ENAMETOOLONG; |
| 594 | return (-1); |
| 595 | } |
Tim Rice | 13af342 | 2015-02-24 07:56:47 -0800 | [diff] [blame^] | 596 | if (connect(s, (struct sockaddr *)&sun_sa, SUN_LEN(&sun_sa)) < 0) { |
Damien Miller | 293cac5 | 2014-12-22 16:30:42 +1100 | [diff] [blame] | 597 | close(s); |
| 598 | return (-1); |
| 599 | } |
| 600 | return (s); |
| 601 | |
| 602 | } |
| 603 | |
| 604 | /* |
| 605 | * unix_listen() |
| 606 | * Create a unix domain socket, and listen on it. |
| 607 | */ |
| 608 | int |
| 609 | unix_listen(char *path) |
| 610 | { |
| 611 | int s; |
| 612 | if ((s = unix_bind(path)) < 0) |
| 613 | return (-1); |
| 614 | |
| 615 | if (listen(s, 5) < 0) { |
| 616 | close(s); |
| 617 | return (-1); |
| 618 | } |
| 619 | return (s); |
| 620 | } |
| 621 | |
| 622 | /* |
| 623 | * remote_connect() |
| 624 | * Returns a socket connected to a remote host. Properly binds to a local |
| 625 | * port or source address if needed. Returns -1 on failure. |
| 626 | */ |
| 627 | int |
| 628 | remote_connect(const char *host, const char *port, struct addrinfo hints) |
| 629 | { |
| 630 | struct addrinfo *res, *res0; |
| 631 | int s, error; |
| 632 | #ifdef SO_RTABLE |
| 633 | int on = 1; |
| 634 | #endif |
| 635 | |
| 636 | if ((error = getaddrinfo(host, port, &hints, &res))) |
| 637 | errx(1, "getaddrinfo: %s", gai_strerror(error)); |
| 638 | |
| 639 | res0 = res; |
| 640 | do { |
| 641 | if ((s = socket(res0->ai_family, res0->ai_socktype, |
| 642 | res0->ai_protocol)) < 0) |
| 643 | continue; |
| 644 | |
| 645 | #ifdef SO_RTABLE |
| 646 | if (rtableid >= 0 && (setsockopt(s, SOL_SOCKET, SO_RTABLE, |
| 647 | &rtableid, sizeof(rtableid)) == -1)) |
| 648 | err(1, "setsockopt SO_RTABLE"); |
| 649 | #endif |
| 650 | /* Bind to a local port or source address if specified. */ |
| 651 | if (sflag || pflag) { |
| 652 | struct addrinfo ahints, *ares; |
| 653 | |
| 654 | #ifdef SO_BINDANY |
| 655 | /* try SO_BINDANY, but don't insist */ |
| 656 | setsockopt(s, SOL_SOCKET, SO_BINDANY, &on, sizeof(on)); |
| 657 | #endif |
| 658 | memset(&ahints, 0, sizeof(struct addrinfo)); |
| 659 | ahints.ai_family = res0->ai_family; |
| 660 | ahints.ai_socktype = uflag ? SOCK_DGRAM : SOCK_STREAM; |
| 661 | ahints.ai_protocol = uflag ? IPPROTO_UDP : IPPROTO_TCP; |
| 662 | ahints.ai_flags = AI_PASSIVE; |
| 663 | if ((error = getaddrinfo(sflag, pflag, &ahints, &ares))) |
| 664 | errx(1, "getaddrinfo: %s", gai_strerror(error)); |
| 665 | |
| 666 | if (bind(s, (struct sockaddr *)ares->ai_addr, |
| 667 | ares->ai_addrlen) < 0) |
| 668 | err(1, "bind failed"); |
| 669 | freeaddrinfo(ares); |
| 670 | } |
| 671 | |
| 672 | set_common_sockopts(s); |
| 673 | |
| 674 | if (timeout_connect(s, res0->ai_addr, res0->ai_addrlen) == 0) |
| 675 | break; |
| 676 | else if (vflag) |
| 677 | warn("connect to %s port %s (%s) failed", host, port, |
| 678 | uflag ? "udp" : "tcp"); |
| 679 | |
| 680 | close(s); |
| 681 | s = -1; |
| 682 | } while ((res0 = res0->ai_next) != NULL); |
| 683 | |
| 684 | freeaddrinfo(res); |
| 685 | |
| 686 | return (s); |
| 687 | } |
| 688 | |
| 689 | int |
| 690 | timeout_connect(int s, const struct sockaddr *name, socklen_t namelen) |
| 691 | { |
| 692 | struct pollfd pfd; |
| 693 | socklen_t optlen; |
| 694 | int flags = 0, optval; |
| 695 | int ret; |
| 696 | |
| 697 | if (timeout != -1) { |
| 698 | flags = fcntl(s, F_GETFL, 0); |
| 699 | if (fcntl(s, F_SETFL, flags | O_NONBLOCK) == -1) |
| 700 | err(1, "set non-blocking mode"); |
| 701 | } |
| 702 | |
| 703 | if ((ret = connect(s, name, namelen)) != 0 && errno == EINPROGRESS) { |
| 704 | pfd.fd = s; |
| 705 | pfd.events = POLLOUT; |
| 706 | if ((ret = poll(&pfd, 1, timeout)) == 1) { |
| 707 | optlen = sizeof(optval); |
| 708 | if ((ret = getsockopt(s, SOL_SOCKET, SO_ERROR, |
| 709 | &optval, &optlen)) == 0) { |
| 710 | errno = optval; |
| 711 | ret = optval == 0 ? 0 : -1; |
| 712 | } |
| 713 | } else if (ret == 0) { |
| 714 | errno = ETIMEDOUT; |
| 715 | ret = -1; |
| 716 | } else |
| 717 | err(1, "poll failed"); |
| 718 | } |
| 719 | |
| 720 | if (timeout != -1 && fcntl(s, F_SETFL, flags) == -1) |
| 721 | err(1, "restoring flags"); |
| 722 | |
| 723 | return (ret); |
| 724 | } |
| 725 | |
| 726 | /* |
| 727 | * local_listen() |
| 728 | * Returns a socket listening on a local port, binds to specified source |
| 729 | * address. Returns -1 on failure. |
| 730 | */ |
| 731 | int |
| 732 | local_listen(char *host, char *port, struct addrinfo hints) |
| 733 | { |
| 734 | struct addrinfo *res, *res0; |
| 735 | int s, ret, x = 1; |
| 736 | int error; |
| 737 | |
| 738 | /* Allow nodename to be null. */ |
| 739 | hints.ai_flags |= AI_PASSIVE; |
| 740 | |
| 741 | /* |
| 742 | * In the case of binding to a wildcard address |
| 743 | * default to binding to an ipv4 address. |
| 744 | */ |
| 745 | if (host == NULL && hints.ai_family == AF_UNSPEC) |
| 746 | hints.ai_family = AF_INET; |
| 747 | |
| 748 | if ((error = getaddrinfo(host, port, &hints, &res))) |
| 749 | errx(1, "getaddrinfo: %s", gai_strerror(error)); |
| 750 | |
| 751 | res0 = res; |
| 752 | do { |
| 753 | if ((s = socket(res0->ai_family, res0->ai_socktype, |
| 754 | res0->ai_protocol)) < 0) |
| 755 | continue; |
| 756 | |
| 757 | #ifdef SO_RTABLE |
| 758 | if (rtableid >= 0 && (setsockopt(s, SOL_SOCKET, SO_RTABLE, |
| 759 | &rtableid, sizeof(rtableid)) == -1)) |
| 760 | err(1, "setsockopt SO_RTABLE"); |
| 761 | #endif |
Damien Miller | c332110 | 2015-01-15 02:59:51 +1100 | [diff] [blame] | 762 | #ifdef SO_REUSEPORT |
Damien Miller | 293cac5 | 2014-12-22 16:30:42 +1100 | [diff] [blame] | 763 | ret = setsockopt(s, SOL_SOCKET, SO_REUSEPORT, &x, sizeof(x)); |
| 764 | if (ret == -1) |
| 765 | err(1, NULL); |
Damien Miller | c332110 | 2015-01-15 02:59:51 +1100 | [diff] [blame] | 766 | #endif |
Damien Miller | 293cac5 | 2014-12-22 16:30:42 +1100 | [diff] [blame] | 767 | set_common_sockopts(s); |
| 768 | |
| 769 | if (bind(s, (struct sockaddr *)res0->ai_addr, |
| 770 | res0->ai_addrlen) == 0) |
| 771 | break; |
| 772 | |
| 773 | close(s); |
| 774 | s = -1; |
| 775 | } while ((res0 = res0->ai_next) != NULL); |
| 776 | |
| 777 | if (!uflag && s != -1) { |
| 778 | if (listen(s, 1) < 0) |
| 779 | err(1, "listen"); |
| 780 | } |
| 781 | |
| 782 | freeaddrinfo(res); |
| 783 | |
| 784 | return (s); |
| 785 | } |
| 786 | |
| 787 | /* |
| 788 | * readwrite() |
| 789 | * Loop that polls on the network file descriptor and stdin. |
| 790 | */ |
| 791 | void |
| 792 | readwrite(int net_fd) |
| 793 | { |
| 794 | struct pollfd pfd[4]; |
| 795 | int stdin_fd = STDIN_FILENO; |
| 796 | int stdout_fd = STDOUT_FILENO; |
| 797 | unsigned char netinbuf[BUFSIZE]; |
| 798 | size_t netinbufpos = 0; |
| 799 | unsigned char stdinbuf[BUFSIZE]; |
| 800 | size_t stdinbufpos = 0; |
| 801 | int n, num_fds; |
| 802 | ssize_t ret; |
| 803 | |
| 804 | /* don't read from stdin if requested */ |
| 805 | if (dflag) |
| 806 | stdin_fd = -1; |
| 807 | |
| 808 | /* stdin */ |
| 809 | pfd[POLL_STDIN].fd = stdin_fd; |
| 810 | pfd[POLL_STDIN].events = POLLIN; |
| 811 | |
| 812 | /* network out */ |
| 813 | pfd[POLL_NETOUT].fd = net_fd; |
| 814 | pfd[POLL_NETOUT].events = 0; |
| 815 | |
| 816 | /* network in */ |
| 817 | pfd[POLL_NETIN].fd = net_fd; |
| 818 | pfd[POLL_NETIN].events = POLLIN; |
| 819 | |
| 820 | /* stdout */ |
| 821 | pfd[POLL_STDOUT].fd = stdout_fd; |
| 822 | pfd[POLL_STDOUT].events = 0; |
| 823 | |
| 824 | while (1) { |
| 825 | /* both inputs are gone, buffers are empty, we are done */ |
| 826 | if (pfd[POLL_STDIN].fd == -1 && pfd[POLL_NETIN].fd == -1 |
| 827 | && stdinbufpos == 0 && netinbufpos == 0) { |
| 828 | close(net_fd); |
| 829 | return; |
| 830 | } |
| 831 | /* both outputs are gone, we can't continue */ |
| 832 | if (pfd[POLL_NETOUT].fd == -1 && pfd[POLL_STDOUT].fd == -1) { |
| 833 | close(net_fd); |
| 834 | return; |
| 835 | } |
| 836 | /* listen and net in gone, queues empty, done */ |
| 837 | if (lflag && pfd[POLL_NETIN].fd == -1 |
| 838 | && stdinbufpos == 0 && netinbufpos == 0) { |
| 839 | close(net_fd); |
| 840 | return; |
| 841 | } |
| 842 | |
| 843 | /* help says -i is for "wait between lines sent". We read and |
| 844 | * write arbitrary amounts of data, and we don't want to start |
| 845 | * scanning for newlines, so this is as good as it gets */ |
| 846 | if (iflag) |
| 847 | sleep(iflag); |
| 848 | |
| 849 | /* poll */ |
| 850 | num_fds = poll(pfd, 4, timeout); |
| 851 | |
| 852 | /* treat poll errors */ |
| 853 | if (num_fds == -1) { |
| 854 | close(net_fd); |
| 855 | err(1, "polling error"); |
| 856 | } |
| 857 | |
| 858 | /* timeout happened */ |
| 859 | if (num_fds == 0) |
| 860 | return; |
| 861 | |
| 862 | /* treat socket error conditions */ |
| 863 | for (n = 0; n < 4; n++) { |
| 864 | if (pfd[n].revents & (POLLERR|POLLNVAL)) { |
| 865 | pfd[n].fd = -1; |
| 866 | } |
| 867 | } |
| 868 | /* reading is possible after HUP */ |
| 869 | if (pfd[POLL_STDIN].events & POLLIN && |
| 870 | pfd[POLL_STDIN].revents & POLLHUP && |
| 871 | ! (pfd[POLL_STDIN].revents & POLLIN)) |
| 872 | pfd[POLL_STDIN].fd = -1; |
| 873 | |
| 874 | if (pfd[POLL_NETIN].events & POLLIN && |
| 875 | pfd[POLL_NETIN].revents & POLLHUP && |
| 876 | ! (pfd[POLL_NETIN].revents & POLLIN)) |
| 877 | pfd[POLL_NETIN].fd = -1; |
| 878 | |
| 879 | if (pfd[POLL_NETOUT].revents & POLLHUP) { |
| 880 | if (Nflag) |
| 881 | shutdown(pfd[POLL_NETOUT].fd, SHUT_WR); |
| 882 | pfd[POLL_NETOUT].fd = -1; |
| 883 | } |
| 884 | /* if HUP, stop watching stdout */ |
| 885 | if (pfd[POLL_STDOUT].revents & POLLHUP) |
| 886 | pfd[POLL_STDOUT].fd = -1; |
| 887 | /* if no net out, stop watching stdin */ |
| 888 | if (pfd[POLL_NETOUT].fd == -1) |
| 889 | pfd[POLL_STDIN].fd = -1; |
| 890 | /* if no stdout, stop watching net in */ |
| 891 | if (pfd[POLL_STDOUT].fd == -1) { |
| 892 | if (pfd[POLL_NETIN].fd != -1) |
| 893 | shutdown(pfd[POLL_NETIN].fd, SHUT_RD); |
| 894 | pfd[POLL_NETIN].fd = -1; |
| 895 | } |
| 896 | |
| 897 | /* try to read from stdin */ |
| 898 | if (pfd[POLL_STDIN].revents & POLLIN && stdinbufpos < BUFSIZE) { |
| 899 | ret = fillbuf(pfd[POLL_STDIN].fd, stdinbuf, |
| 900 | &stdinbufpos); |
| 901 | /* error or eof on stdin - remove from pfd */ |
| 902 | if (ret == 0 || ret == -1) |
| 903 | pfd[POLL_STDIN].fd = -1; |
| 904 | /* read something - poll net out */ |
| 905 | if (stdinbufpos > 0) |
| 906 | pfd[POLL_NETOUT].events = POLLOUT; |
| 907 | /* filled buffer - remove self from polling */ |
| 908 | if (stdinbufpos == BUFSIZE) |
| 909 | pfd[POLL_STDIN].events = 0; |
| 910 | } |
| 911 | /* try to write to network */ |
| 912 | if (pfd[POLL_NETOUT].revents & POLLOUT && stdinbufpos > 0) { |
| 913 | ret = drainbuf(pfd[POLL_NETOUT].fd, stdinbuf, |
| 914 | &stdinbufpos); |
| 915 | if (ret == -1) |
| 916 | pfd[POLL_NETOUT].fd = -1; |
| 917 | /* buffer empty - remove self from polling */ |
| 918 | if (stdinbufpos == 0) |
| 919 | pfd[POLL_NETOUT].events = 0; |
| 920 | /* buffer no longer full - poll stdin again */ |
| 921 | if (stdinbufpos < BUFSIZE) |
| 922 | pfd[POLL_STDIN].events = POLLIN; |
| 923 | } |
| 924 | /* try to read from network */ |
| 925 | if (pfd[POLL_NETIN].revents & POLLIN && netinbufpos < BUFSIZE) { |
| 926 | ret = fillbuf(pfd[POLL_NETIN].fd, netinbuf, |
| 927 | &netinbufpos); |
| 928 | if (ret == -1) |
| 929 | pfd[POLL_NETIN].fd = -1; |
| 930 | /* eof on net in - remove from pfd */ |
| 931 | if (ret == 0) { |
| 932 | shutdown(pfd[POLL_NETIN].fd, SHUT_RD); |
| 933 | pfd[POLL_NETIN].fd = -1; |
| 934 | } |
| 935 | /* read something - poll stdout */ |
| 936 | if (netinbufpos > 0) |
| 937 | pfd[POLL_STDOUT].events = POLLOUT; |
| 938 | /* filled buffer - remove self from polling */ |
| 939 | if (netinbufpos == BUFSIZE) |
| 940 | pfd[POLL_NETIN].events = 0; |
| 941 | /* handle telnet */ |
| 942 | if (tflag) |
| 943 | atelnet(pfd[POLL_NETIN].fd, netinbuf, |
| 944 | netinbufpos); |
| 945 | } |
| 946 | /* try to write to stdout */ |
| 947 | if (pfd[POLL_STDOUT].revents & POLLOUT && netinbufpos > 0) { |
| 948 | ret = drainbuf(pfd[POLL_STDOUT].fd, netinbuf, |
| 949 | &netinbufpos); |
| 950 | if (ret == -1) |
| 951 | pfd[POLL_STDOUT].fd = -1; |
| 952 | /* buffer empty - remove self from polling */ |
| 953 | if (netinbufpos == 0) |
| 954 | pfd[POLL_STDOUT].events = 0; |
| 955 | /* buffer no longer full - poll net in again */ |
| 956 | if (netinbufpos < BUFSIZE) |
| 957 | pfd[POLL_NETIN].events = POLLIN; |
| 958 | } |
| 959 | |
| 960 | /* stdin gone and queue empty? */ |
| 961 | if (pfd[POLL_STDIN].fd == -1 && stdinbufpos == 0) { |
| 962 | if (pfd[POLL_NETOUT].fd != -1 && Nflag) |
| 963 | shutdown(pfd[POLL_NETOUT].fd, SHUT_WR); |
| 964 | pfd[POLL_NETOUT].fd = -1; |
| 965 | } |
| 966 | /* net in gone and queue empty? */ |
| 967 | if (pfd[POLL_NETIN].fd == -1 && netinbufpos == 0) { |
| 968 | pfd[POLL_STDOUT].fd = -1; |
| 969 | } |
| 970 | } |
| 971 | } |
| 972 | |
| 973 | ssize_t |
| 974 | drainbuf(int fd, unsigned char *buf, size_t *bufpos) |
| 975 | { |
| 976 | ssize_t n; |
| 977 | ssize_t adjust; |
| 978 | |
| 979 | n = write(fd, buf, *bufpos); |
| 980 | /* don't treat EAGAIN, EINTR as error */ |
| 981 | if (n == -1 && (errno == EAGAIN || errno == EINTR)) |
| 982 | n = -2; |
| 983 | if (n <= 0) |
| 984 | return n; |
| 985 | /* adjust buffer */ |
| 986 | adjust = *bufpos - n; |
| 987 | if (adjust > 0) |
| 988 | memmove(buf, buf + n, adjust); |
| 989 | *bufpos -= n; |
| 990 | return n; |
| 991 | } |
| 992 | |
| 993 | |
| 994 | ssize_t |
| 995 | fillbuf(int fd, unsigned char *buf, size_t *bufpos) |
| 996 | { |
| 997 | size_t num = BUFSIZE - *bufpos; |
| 998 | ssize_t n; |
| 999 | |
| 1000 | n = read(fd, buf + *bufpos, num); |
| 1001 | /* don't treat EAGAIN, EINTR as error */ |
| 1002 | if (n == -1 && (errno == EAGAIN || errno == EINTR)) |
| 1003 | n = -2; |
| 1004 | if (n <= 0) |
| 1005 | return n; |
| 1006 | *bufpos += n; |
| 1007 | return n; |
| 1008 | } |
| 1009 | |
| 1010 | /* |
| 1011 | * fdpass() |
| 1012 | * Pass the connected file descriptor to stdout and exit. |
| 1013 | */ |
| 1014 | void |
| 1015 | fdpass(int nfd) |
| 1016 | { |
| 1017 | struct msghdr mh; |
| 1018 | union { |
| 1019 | struct cmsghdr hdr; |
| 1020 | char buf[CMSG_SPACE(sizeof(int))]; |
| 1021 | } cmsgbuf; |
| 1022 | struct cmsghdr *cmsg; |
| 1023 | struct iovec iov; |
| 1024 | char c = '\0'; |
| 1025 | ssize_t r; |
| 1026 | struct pollfd pfd; |
| 1027 | |
| 1028 | /* Avoid obvious stupidity */ |
| 1029 | if (isatty(STDOUT_FILENO)) |
| 1030 | errx(1, "Cannot pass file descriptor to tty"); |
| 1031 | |
| 1032 | bzero(&mh, sizeof(mh)); |
| 1033 | bzero(&cmsgbuf, sizeof(cmsgbuf)); |
| 1034 | bzero(&iov, sizeof(iov)); |
| 1035 | bzero(&pfd, sizeof(pfd)); |
| 1036 | |
| 1037 | mh.msg_control = (caddr_t)&cmsgbuf.buf; |
| 1038 | mh.msg_controllen = sizeof(cmsgbuf.buf); |
| 1039 | cmsg = CMSG_FIRSTHDR(&mh); |
| 1040 | cmsg->cmsg_len = CMSG_LEN(sizeof(int)); |
| 1041 | cmsg->cmsg_level = SOL_SOCKET; |
| 1042 | cmsg->cmsg_type = SCM_RIGHTS; |
| 1043 | *(int *)CMSG_DATA(cmsg) = nfd; |
| 1044 | |
| 1045 | iov.iov_base = &c; |
| 1046 | iov.iov_len = 1; |
| 1047 | mh.msg_iov = &iov; |
| 1048 | mh.msg_iovlen = 1; |
| 1049 | |
| 1050 | bzero(&pfd, sizeof(pfd)); |
| 1051 | pfd.fd = STDOUT_FILENO; |
| 1052 | for (;;) { |
| 1053 | r = sendmsg(STDOUT_FILENO, &mh, 0); |
| 1054 | if (r == -1) { |
| 1055 | if (errno == EAGAIN || errno == EINTR) { |
| 1056 | pfd.events = POLLOUT; |
| 1057 | if (poll(&pfd, 1, -1) == -1) |
| 1058 | err(1, "poll"); |
| 1059 | continue; |
| 1060 | } |
| 1061 | err(1, "sendmsg"); |
| 1062 | } else if (r == -1) |
| 1063 | errx(1, "sendmsg: unexpected return value %zd", r); |
| 1064 | else |
| 1065 | break; |
| 1066 | } |
| 1067 | exit(0); |
| 1068 | } |
| 1069 | |
| 1070 | /* Deal with RFC 854 WILL/WONT DO/DONT negotiation. */ |
| 1071 | void |
| 1072 | atelnet(int nfd, unsigned char *buf, unsigned int size) |
| 1073 | { |
| 1074 | unsigned char *p, *end; |
| 1075 | unsigned char obuf[4]; |
| 1076 | |
| 1077 | if (size < 3) |
| 1078 | return; |
| 1079 | end = buf + size - 2; |
| 1080 | |
| 1081 | for (p = buf; p < end; p++) { |
| 1082 | if (*p != IAC) |
| 1083 | continue; |
| 1084 | |
| 1085 | obuf[0] = IAC; |
| 1086 | p++; |
| 1087 | if ((*p == WILL) || (*p == WONT)) |
| 1088 | obuf[1] = DONT; |
| 1089 | else if ((*p == DO) || (*p == DONT)) |
| 1090 | obuf[1] = WONT; |
| 1091 | else |
| 1092 | continue; |
| 1093 | |
| 1094 | p++; |
| 1095 | obuf[2] = *p; |
| 1096 | if (atomicio(vwrite, nfd, obuf, 3) != 3) |
| 1097 | warn("Write Error!"); |
| 1098 | } |
| 1099 | } |
| 1100 | |
| 1101 | /* |
| 1102 | * build_ports() |
| 1103 | * Build an array of ports in portlist[], listing each port |
| 1104 | * that we should try to connect to. |
| 1105 | */ |
| 1106 | void |
| 1107 | build_ports(char *p) |
| 1108 | { |
| 1109 | const char *errstr; |
| 1110 | char *n; |
| 1111 | int hi, lo, cp; |
| 1112 | int x = 0; |
| 1113 | |
| 1114 | if ((n = strchr(p, '-')) != NULL) { |
| 1115 | *n = '\0'; |
| 1116 | n++; |
| 1117 | |
| 1118 | /* Make sure the ports are in order: lowest->highest. */ |
| 1119 | hi = strtonum(n, 1, PORT_MAX, &errstr); |
| 1120 | if (errstr) |
| 1121 | errx(1, "port number %s: %s", errstr, n); |
| 1122 | lo = strtonum(p, 1, PORT_MAX, &errstr); |
| 1123 | if (errstr) |
| 1124 | errx(1, "port number %s: %s", errstr, p); |
| 1125 | |
| 1126 | if (lo > hi) { |
| 1127 | cp = hi; |
| 1128 | hi = lo; |
| 1129 | lo = cp; |
| 1130 | } |
| 1131 | |
| 1132 | /* Load ports sequentially. */ |
| 1133 | for (cp = lo; cp <= hi; cp++) { |
| 1134 | portlist[x] = calloc(1, PORT_MAX_LEN); |
| 1135 | if (portlist[x] == NULL) |
| 1136 | err(1, NULL); |
| 1137 | snprintf(portlist[x], PORT_MAX_LEN, "%d", cp); |
| 1138 | x++; |
| 1139 | } |
| 1140 | |
| 1141 | /* Randomly swap ports. */ |
| 1142 | if (rflag) { |
| 1143 | int y; |
| 1144 | char *c; |
| 1145 | |
| 1146 | for (x = 0; x <= (hi - lo); x++) { |
| 1147 | y = (arc4random() & 0xFFFF) % (hi - lo); |
| 1148 | c = portlist[x]; |
| 1149 | portlist[x] = portlist[y]; |
| 1150 | portlist[y] = c; |
| 1151 | } |
| 1152 | } |
| 1153 | } else { |
| 1154 | hi = strtonum(p, 1, PORT_MAX, &errstr); |
| 1155 | if (errstr) |
| 1156 | errx(1, "port number %s: %s", errstr, p); |
| 1157 | portlist[0] = strdup(p); |
| 1158 | if (portlist[0] == NULL) |
| 1159 | err(1, NULL); |
| 1160 | } |
| 1161 | } |
| 1162 | |
| 1163 | /* |
| 1164 | * udptest() |
| 1165 | * Do a few writes to see if the UDP port is there. |
| 1166 | * Fails once PF state table is full. |
| 1167 | */ |
| 1168 | int |
| 1169 | udptest(int s) |
| 1170 | { |
| 1171 | int i, ret; |
| 1172 | |
| 1173 | for (i = 0; i <= 3; i++) { |
| 1174 | if (write(s, "X", 1) == 1) |
| 1175 | ret = 1; |
| 1176 | else |
| 1177 | ret = -1; |
| 1178 | } |
| 1179 | return (ret); |
| 1180 | } |
| 1181 | |
| 1182 | void |
| 1183 | set_common_sockopts(int s) |
| 1184 | { |
| 1185 | int x = 1; |
| 1186 | |
Damien Miller | 69ff64f | 2015-01-27 23:07:43 +1100 | [diff] [blame] | 1187 | #ifdef TCP_MD5SIG |
Damien Miller | 293cac5 | 2014-12-22 16:30:42 +1100 | [diff] [blame] | 1188 | if (Sflag) { |
| 1189 | if (setsockopt(s, IPPROTO_TCP, TCP_MD5SIG, |
| 1190 | &x, sizeof(x)) == -1) |
| 1191 | err(1, NULL); |
| 1192 | } |
Damien Miller | 69ff64f | 2015-01-27 23:07:43 +1100 | [diff] [blame] | 1193 | #endif |
Damien Miller | 293cac5 | 2014-12-22 16:30:42 +1100 | [diff] [blame] | 1194 | if (Dflag) { |
| 1195 | if (setsockopt(s, SOL_SOCKET, SO_DEBUG, |
| 1196 | &x, sizeof(x)) == -1) |
| 1197 | err(1, NULL); |
| 1198 | } |
| 1199 | if (Tflag != -1) { |
| 1200 | if (setsockopt(s, IPPROTO_IP, IP_TOS, |
| 1201 | &Tflag, sizeof(Tflag)) == -1) |
| 1202 | err(1, "set IP ToS"); |
| 1203 | } |
| 1204 | if (Iflag) { |
| 1205 | if (setsockopt(s, SOL_SOCKET, SO_RCVBUF, |
| 1206 | &Iflag, sizeof(Iflag)) == -1) |
| 1207 | err(1, "set TCP receive buffer size"); |
| 1208 | } |
| 1209 | if (Oflag) { |
| 1210 | if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, |
| 1211 | &Oflag, sizeof(Oflag)) == -1) |
| 1212 | err(1, "set TCP send buffer size"); |
| 1213 | } |
| 1214 | } |
| 1215 | |
| 1216 | int |
| 1217 | map_tos(char *s, int *val) |
| 1218 | { |
| 1219 | /* DiffServ Codepoints and other TOS mappings */ |
| 1220 | const struct toskeywords { |
| 1221 | const char *keyword; |
| 1222 | int val; |
| 1223 | } *t, toskeywords[] = { |
| 1224 | { "af11", IPTOS_DSCP_AF11 }, |
| 1225 | { "af12", IPTOS_DSCP_AF12 }, |
| 1226 | { "af13", IPTOS_DSCP_AF13 }, |
| 1227 | { "af21", IPTOS_DSCP_AF21 }, |
| 1228 | { "af22", IPTOS_DSCP_AF22 }, |
| 1229 | { "af23", IPTOS_DSCP_AF23 }, |
| 1230 | { "af31", IPTOS_DSCP_AF31 }, |
| 1231 | { "af32", IPTOS_DSCP_AF32 }, |
| 1232 | { "af33", IPTOS_DSCP_AF33 }, |
| 1233 | { "af41", IPTOS_DSCP_AF41 }, |
| 1234 | { "af42", IPTOS_DSCP_AF42 }, |
| 1235 | { "af43", IPTOS_DSCP_AF43 }, |
| 1236 | { "critical", IPTOS_PREC_CRITIC_ECP }, |
| 1237 | { "cs0", IPTOS_DSCP_CS0 }, |
| 1238 | { "cs1", IPTOS_DSCP_CS1 }, |
| 1239 | { "cs2", IPTOS_DSCP_CS2 }, |
| 1240 | { "cs3", IPTOS_DSCP_CS3 }, |
| 1241 | { "cs4", IPTOS_DSCP_CS4 }, |
| 1242 | { "cs5", IPTOS_DSCP_CS5 }, |
| 1243 | { "cs6", IPTOS_DSCP_CS6 }, |
| 1244 | { "cs7", IPTOS_DSCP_CS7 }, |
| 1245 | { "ef", IPTOS_DSCP_EF }, |
| 1246 | { "inetcontrol", IPTOS_PREC_INTERNETCONTROL }, |
| 1247 | { "lowdelay", IPTOS_LOWDELAY }, |
| 1248 | { "netcontrol", IPTOS_PREC_NETCONTROL }, |
| 1249 | { "reliability", IPTOS_RELIABILITY }, |
| 1250 | { "throughput", IPTOS_THROUGHPUT }, |
| 1251 | { NULL, -1 }, |
| 1252 | }; |
| 1253 | |
| 1254 | for (t = toskeywords; t->keyword != NULL; t++) { |
| 1255 | if (strcmp(s, t->keyword) == 0) { |
| 1256 | *val = t->val; |
| 1257 | return (1); |
| 1258 | } |
| 1259 | } |
| 1260 | |
| 1261 | return (0); |
| 1262 | } |
| 1263 | |
| 1264 | void |
| 1265 | report_connect(const struct sockaddr *sa, socklen_t salen) |
| 1266 | { |
| 1267 | char remote_host[NI_MAXHOST]; |
| 1268 | char remote_port[NI_MAXSERV]; |
| 1269 | int herr; |
| 1270 | int flags = NI_NUMERICSERV; |
| 1271 | |
| 1272 | if (nflag) |
| 1273 | flags |= NI_NUMERICHOST; |
| 1274 | |
| 1275 | if ((herr = getnameinfo(sa, salen, |
| 1276 | remote_host, sizeof(remote_host), |
| 1277 | remote_port, sizeof(remote_port), |
| 1278 | flags)) != 0) { |
| 1279 | if (herr == EAI_SYSTEM) |
| 1280 | err(1, "getnameinfo"); |
| 1281 | else |
| 1282 | errx(1, "getnameinfo: %s", gai_strerror(herr)); |
| 1283 | } |
| 1284 | |
| 1285 | fprintf(stderr, |
| 1286 | "Connection from %s %s " |
| 1287 | "received!\n", remote_host, remote_port); |
| 1288 | } |
| 1289 | |
| 1290 | void |
| 1291 | help(void) |
| 1292 | { |
| 1293 | usage(0); |
| 1294 | fprintf(stderr, "\tCommand Summary:\n\ |
| 1295 | \t-4 Use IPv4\n\ |
| 1296 | \t-6 Use IPv6\n\ |
| 1297 | \t-D Enable the debug socket option\n\ |
| 1298 | \t-d Detach from stdin\n\ |
| 1299 | \t-F Pass socket fd\n\ |
| 1300 | \t-h This help text\n\ |
| 1301 | \t-I length TCP receive buffer length\n\ |
| 1302 | \t-i secs\t Delay interval for lines sent, ports scanned\n\ |
| 1303 | \t-k Keep inbound sockets open for multiple connects\n\ |
| 1304 | \t-l Listen mode, for inbound connects\n\ |
| 1305 | \t-N Shutdown the network socket after EOF on stdin\n\ |
| 1306 | \t-n Suppress name/port resolutions\n\ |
| 1307 | \t-O length TCP send buffer length\n\ |
| 1308 | \t-P proxyuser\tUsername for proxy authentication\n\ |
| 1309 | \t-p port\t Specify local port for remote connects\n\ |
| 1310 | \t-r Randomize remote ports\n\ |
| 1311 | \t-S Enable the TCP MD5 signature option\n\ |
| 1312 | \t-s addr\t Local source address\n\ |
| 1313 | \t-T toskeyword\tSet IP Type of Service\n\ |
| 1314 | \t-t Answer TELNET negotiation\n\ |
| 1315 | \t-U Use UNIX domain socket\n\ |
| 1316 | \t-u UDP mode\n\ |
| 1317 | \t-V rtable Specify alternate routing table\n\ |
| 1318 | \t-v Verbose\n\ |
| 1319 | \t-w secs\t Timeout for connects and final net reads\n\ |
| 1320 | \t-X proto Proxy protocol: \"4\", \"5\" (SOCKS) or \"connect\"\n\ |
| 1321 | \t-x addr[:port]\tSpecify proxy address and port\n\ |
| 1322 | \t-z Zero-I/O mode [used for scanning]\n\ |
| 1323 | Port numbers can be individual or ranges: lo-hi [inclusive]\n"); |
| 1324 | exit(1); |
| 1325 | } |
| 1326 | |
| 1327 | void |
| 1328 | usage(int ret) |
| 1329 | { |
| 1330 | fprintf(stderr, |
| 1331 | "usage: nc [-46DdFhklNnrStUuvz] [-I length] [-i interval] [-O length]\n" |
| 1332 | "\t [-P proxy_username] [-p source_port] [-s source] [-T ToS]\n" |
| 1333 | "\t [-V rtable] [-w timeout] [-X proxy_protocol]\n" |
| 1334 | "\t [-x proxy_address[:port]] [destination] [port]\n"); |
| 1335 | if (ret) |
| 1336 | exit(1); |
| 1337 | } |
| 1338 | |
| 1339 | /* *** src/usr.bin/nc/socks.c *** */ |
| 1340 | |
| 1341 | |
| 1342 | /* $OpenBSD: socks.c,v 1.20 2012/03/08 09:56:28 espie Exp $ */ |
| 1343 | |
| 1344 | /* |
| 1345 | * Copyright (c) 1999 Niklas Hallqvist. All rights reserved. |
| 1346 | * Copyright (c) 2004, 2005 Damien Miller. All rights reserved. |
| 1347 | * |
| 1348 | * Redistribution and use in source and binary forms, with or without |
| 1349 | * modification, are permitted provided that the following conditions |
| 1350 | * are met: |
| 1351 | * 1. Redistributions of source code must retain the above copyright |
| 1352 | * notice, this list of conditions and the following disclaimer. |
| 1353 | * 2. Redistributions in binary form must reproduce the above copyright |
| 1354 | * notice, this list of conditions and the following disclaimer in the |
| 1355 | * documentation and/or other materials provided with the distribution. |
| 1356 | * |
| 1357 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 1358 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 1359 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 1360 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 1361 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 1362 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 1363 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 1364 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 1365 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 1366 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 1367 | */ |
| 1368 | |
| 1369 | #include <sys/types.h> |
| 1370 | #include <sys/socket.h> |
| 1371 | #include <netinet/in.h> |
| 1372 | #include <arpa/inet.h> |
| 1373 | |
Damien Miller | 293cac5 | 2014-12-22 16:30:42 +1100 | [diff] [blame] | 1374 | #include <errno.h> |
| 1375 | #include <netdb.h> |
| 1376 | #include <stdio.h> |
| 1377 | #include <stdlib.h> |
| 1378 | #include <string.h> |
| 1379 | #include <unistd.h> |
| 1380 | #include <resolv.h> |
| 1381 | |
| 1382 | #define SOCKS_PORT "1080" |
| 1383 | #define HTTP_PROXY_PORT "3128" |
| 1384 | #define HTTP_MAXHDRS 64 |
| 1385 | #define SOCKS_V5 5 |
| 1386 | #define SOCKS_V4 4 |
| 1387 | #define SOCKS_NOAUTH 0 |
| 1388 | #define SOCKS_NOMETHOD 0xff |
| 1389 | #define SOCKS_CONNECT 1 |
| 1390 | #define SOCKS_IPV4 1 |
| 1391 | #define SOCKS_DOMAIN 3 |
| 1392 | #define SOCKS_IPV6 4 |
| 1393 | |
| 1394 | int remote_connect(const char *, const char *, struct addrinfo); |
| 1395 | int socks_connect(const char *, const char *, struct addrinfo, |
| 1396 | const char *, const char *, struct addrinfo, int, |
| 1397 | const char *); |
| 1398 | |
| 1399 | static int |
| 1400 | decode_addrport(const char *h, const char *p, struct sockaddr *addr, |
| 1401 | socklen_t addrlen, int v4only, int numeric) |
| 1402 | { |
| 1403 | int r; |
| 1404 | struct addrinfo hints, *res; |
| 1405 | |
| 1406 | bzero(&hints, sizeof(hints)); |
| 1407 | hints.ai_family = v4only ? PF_INET : PF_UNSPEC; |
| 1408 | hints.ai_flags = numeric ? AI_NUMERICHOST : 0; |
| 1409 | hints.ai_socktype = SOCK_STREAM; |
| 1410 | r = getaddrinfo(h, p, &hints, &res); |
| 1411 | /* Don't fatal when attempting to convert a numeric address */ |
| 1412 | if (r != 0) { |
| 1413 | if (!numeric) { |
| 1414 | errx(1, "getaddrinfo(\"%.64s\", \"%.64s\"): %s", h, p, |
| 1415 | gai_strerror(r)); |
| 1416 | } |
| 1417 | return (-1); |
| 1418 | } |
| 1419 | if (addrlen < res->ai_addrlen) { |
| 1420 | freeaddrinfo(res); |
| 1421 | errx(1, "internal error: addrlen < res->ai_addrlen"); |
| 1422 | } |
| 1423 | memcpy(addr, res->ai_addr, res->ai_addrlen); |
| 1424 | freeaddrinfo(res); |
| 1425 | return (0); |
| 1426 | } |
| 1427 | |
| 1428 | static int |
| 1429 | proxy_read_line(int fd, char *buf, size_t bufsz) |
| 1430 | { |
| 1431 | size_t off; |
| 1432 | |
| 1433 | for(off = 0;;) { |
| 1434 | if (off >= bufsz) |
| 1435 | errx(1, "proxy read too long"); |
| 1436 | if (atomicio(read, fd, buf + off, 1) != 1) |
| 1437 | err(1, "proxy read"); |
| 1438 | /* Skip CR */ |
| 1439 | if (buf[off] == '\r') |
| 1440 | continue; |
| 1441 | if (buf[off] == '\n') { |
| 1442 | buf[off] = '\0'; |
| 1443 | break; |
| 1444 | } |
| 1445 | off++; |
| 1446 | } |
| 1447 | return (off); |
| 1448 | } |
| 1449 | |
| 1450 | static const char * |
| 1451 | getproxypass(const char *proxyuser, const char *proxyhost) |
| 1452 | { |
| 1453 | char prompt[512]; |
| 1454 | static char pw[256]; |
| 1455 | |
| 1456 | snprintf(prompt, sizeof(prompt), "Proxy password for %s@%s: ", |
| 1457 | proxyuser, proxyhost); |
| 1458 | if (readpassphrase(prompt, pw, sizeof(pw), RPP_REQUIRE_TTY) == NULL) |
| 1459 | errx(1, "Unable to read proxy passphrase"); |
| 1460 | return (pw); |
| 1461 | } |
| 1462 | |
| 1463 | int |
| 1464 | socks_connect(const char *host, const char *port, |
| 1465 | struct addrinfo hints __attribute__ ((__unused__)), |
| 1466 | const char *proxyhost, const char *proxyport, struct addrinfo proxyhints, |
| 1467 | int socksv, const char *proxyuser) |
| 1468 | { |
| 1469 | int proxyfd, r, authretry = 0; |
| 1470 | size_t hlen, wlen; |
| 1471 | unsigned char buf[1024]; |
| 1472 | size_t cnt; |
| 1473 | struct sockaddr_storage addr; |
| 1474 | struct sockaddr_in *in4 = (struct sockaddr_in *)&addr; |
| 1475 | struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)&addr; |
| 1476 | in_port_t serverport; |
| 1477 | const char *proxypass = NULL; |
| 1478 | |
| 1479 | if (proxyport == NULL) |
| 1480 | proxyport = (socksv == -1) ? HTTP_PROXY_PORT : SOCKS_PORT; |
| 1481 | |
| 1482 | /* Abuse API to lookup port */ |
| 1483 | if (decode_addrport("0.0.0.0", port, (struct sockaddr *)&addr, |
| 1484 | sizeof(addr), 1, 1) == -1) |
| 1485 | errx(1, "unknown port \"%.64s\"", port); |
| 1486 | serverport = in4->sin_port; |
| 1487 | |
| 1488 | again: |
| 1489 | if (authretry++ > 3) |
| 1490 | errx(1, "Too many authentication failures"); |
| 1491 | |
| 1492 | proxyfd = remote_connect(proxyhost, proxyport, proxyhints); |
| 1493 | |
| 1494 | if (proxyfd < 0) |
| 1495 | return (-1); |
| 1496 | |
| 1497 | if (socksv == 5) { |
| 1498 | if (decode_addrport(host, port, (struct sockaddr *)&addr, |
| 1499 | sizeof(addr), 0, 1) == -1) |
| 1500 | addr.ss_family = 0; /* used in switch below */ |
| 1501 | |
| 1502 | /* Version 5, one method: no authentication */ |
| 1503 | buf[0] = SOCKS_V5; |
| 1504 | buf[1] = 1; |
| 1505 | buf[2] = SOCKS_NOAUTH; |
| 1506 | cnt = atomicio(vwrite, proxyfd, buf, 3); |
| 1507 | if (cnt != 3) |
| 1508 | err(1, "write failed (%zu/3)", cnt); |
| 1509 | |
| 1510 | cnt = atomicio(read, proxyfd, buf, 2); |
| 1511 | if (cnt != 2) |
| 1512 | err(1, "read failed (%zu/3)", cnt); |
| 1513 | |
| 1514 | if (buf[1] == SOCKS_NOMETHOD) |
| 1515 | errx(1, "authentication method negotiation failed"); |
| 1516 | |
| 1517 | switch (addr.ss_family) { |
| 1518 | case 0: |
| 1519 | /* Version 5, connect: domain name */ |
| 1520 | |
| 1521 | /* Max domain name length is 255 bytes */ |
| 1522 | hlen = strlen(host); |
| 1523 | if (hlen > 255) |
| 1524 | errx(1, "host name too long for SOCKS5"); |
| 1525 | buf[0] = SOCKS_V5; |
| 1526 | buf[1] = SOCKS_CONNECT; |
| 1527 | buf[2] = 0; |
| 1528 | buf[3] = SOCKS_DOMAIN; |
| 1529 | buf[4] = hlen; |
| 1530 | memcpy(buf + 5, host, hlen); |
| 1531 | memcpy(buf + 5 + hlen, &serverport, sizeof serverport); |
| 1532 | wlen = 7 + hlen; |
| 1533 | break; |
| 1534 | case AF_INET: |
| 1535 | /* Version 5, connect: IPv4 address */ |
| 1536 | buf[0] = SOCKS_V5; |
| 1537 | buf[1] = SOCKS_CONNECT; |
| 1538 | buf[2] = 0; |
| 1539 | buf[3] = SOCKS_IPV4; |
| 1540 | memcpy(buf + 4, &in4->sin_addr, sizeof in4->sin_addr); |
| 1541 | memcpy(buf + 8, &in4->sin_port, sizeof in4->sin_port); |
| 1542 | wlen = 10; |
| 1543 | break; |
| 1544 | case AF_INET6: |
| 1545 | /* Version 5, connect: IPv6 address */ |
| 1546 | buf[0] = SOCKS_V5; |
| 1547 | buf[1] = SOCKS_CONNECT; |
| 1548 | buf[2] = 0; |
| 1549 | buf[3] = SOCKS_IPV6; |
| 1550 | memcpy(buf + 4, &in6->sin6_addr, sizeof in6->sin6_addr); |
| 1551 | memcpy(buf + 20, &in6->sin6_port, |
| 1552 | sizeof in6->sin6_port); |
| 1553 | wlen = 22; |
| 1554 | break; |
| 1555 | default: |
| 1556 | errx(1, "internal error: silly AF"); |
| 1557 | } |
| 1558 | |
| 1559 | cnt = atomicio(vwrite, proxyfd, buf, wlen); |
| 1560 | if (cnt != wlen) |
| 1561 | err(1, "write failed (%zu/%zu)", cnt, wlen); |
| 1562 | |
| 1563 | cnt = atomicio(read, proxyfd, buf, 4); |
| 1564 | if (cnt != 4) |
| 1565 | err(1, "read failed (%zu/4)", cnt); |
| 1566 | if (buf[1] != 0) |
| 1567 | errx(1, "connection failed, SOCKS error %d", buf[1]); |
| 1568 | switch (buf[3]) { |
| 1569 | case SOCKS_IPV4: |
| 1570 | cnt = atomicio(read, proxyfd, buf + 4, 6); |
| 1571 | if (cnt != 6) |
| 1572 | err(1, "read failed (%zu/6)", cnt); |
| 1573 | break; |
| 1574 | case SOCKS_IPV6: |
| 1575 | cnt = atomicio(read, proxyfd, buf + 4, 18); |
| 1576 | if (cnt != 18) |
| 1577 | err(1, "read failed (%zu/18)", cnt); |
| 1578 | break; |
| 1579 | default: |
| 1580 | errx(1, "connection failed, unsupported address type"); |
| 1581 | } |
| 1582 | } else if (socksv == 4) { |
| 1583 | /* This will exit on lookup failure */ |
| 1584 | decode_addrport(host, port, (struct sockaddr *)&addr, |
| 1585 | sizeof(addr), 1, 0); |
| 1586 | |
| 1587 | /* Version 4 */ |
| 1588 | buf[0] = SOCKS_V4; |
| 1589 | buf[1] = SOCKS_CONNECT; /* connect */ |
| 1590 | memcpy(buf + 2, &in4->sin_port, sizeof in4->sin_port); |
| 1591 | memcpy(buf + 4, &in4->sin_addr, sizeof in4->sin_addr); |
| 1592 | buf[8] = 0; /* empty username */ |
| 1593 | wlen = 9; |
| 1594 | |
| 1595 | cnt = atomicio(vwrite, proxyfd, buf, wlen); |
| 1596 | if (cnt != wlen) |
| 1597 | err(1, "write failed (%zu/%zu)", cnt, wlen); |
| 1598 | |
| 1599 | cnt = atomicio(read, proxyfd, buf, 8); |
| 1600 | if (cnt != 8) |
| 1601 | err(1, "read failed (%zu/8)", cnt); |
| 1602 | if (buf[1] != 90) |
| 1603 | errx(1, "connection failed, SOCKS error %d", buf[1]); |
| 1604 | } else if (socksv == -1) { |
| 1605 | /* HTTP proxy CONNECT */ |
| 1606 | |
| 1607 | /* Disallow bad chars in hostname */ |
| 1608 | if (strcspn(host, "\r\n\t []:") != strlen(host)) |
| 1609 | errx(1, "Invalid hostname"); |
| 1610 | |
| 1611 | /* Try to be sane about numeric IPv6 addresses */ |
| 1612 | if (strchr(host, ':') != NULL) { |
| 1613 | r = snprintf(buf, sizeof(buf), |
| 1614 | "CONNECT [%s]:%d HTTP/1.0\r\n", |
| 1615 | host, ntohs(serverport)); |
| 1616 | } else { |
| 1617 | r = snprintf(buf, sizeof(buf), |
| 1618 | "CONNECT %s:%d HTTP/1.0\r\n", |
| 1619 | host, ntohs(serverport)); |
| 1620 | } |
| 1621 | if (r == -1 || (size_t)r >= sizeof(buf)) |
| 1622 | errx(1, "hostname too long"); |
| 1623 | r = strlen(buf); |
| 1624 | |
| 1625 | cnt = atomicio(vwrite, proxyfd, buf, r); |
| 1626 | if (cnt != (size_t)r) |
| 1627 | err(1, "write failed (%zu/%d)", cnt, r); |
| 1628 | |
| 1629 | if (authretry > 1) { |
| 1630 | char resp[1024]; |
| 1631 | |
| 1632 | proxypass = getproxypass(proxyuser, proxyhost); |
| 1633 | r = snprintf(buf, sizeof(buf), "%s:%s", |
| 1634 | proxyuser, proxypass); |
| 1635 | if (r == -1 || (size_t)r >= sizeof(buf) || |
| 1636 | b64_ntop(buf, strlen(buf), resp, |
| 1637 | sizeof(resp)) == -1) |
| 1638 | errx(1, "Proxy username/password too long"); |
| 1639 | r = snprintf(buf, sizeof(buf), "Proxy-Authorization: " |
| 1640 | "Basic %s\r\n", resp); |
| 1641 | if (r == -1 || (size_t)r >= sizeof(buf)) |
| 1642 | errx(1, "Proxy auth response too long"); |
| 1643 | r = strlen(buf); |
| 1644 | if ((cnt = atomicio(vwrite, proxyfd, buf, r)) != (size_t)r) |
| 1645 | err(1, "write failed (%zu/%d)", cnt, r); |
| 1646 | } |
| 1647 | |
| 1648 | /* Terminate headers */ |
| 1649 | if ((r = atomicio(vwrite, proxyfd, "\r\n", 2)) != 2) |
| 1650 | err(1, "write failed (2/%d)", r); |
| 1651 | |
| 1652 | /* Read status reply */ |
| 1653 | proxy_read_line(proxyfd, buf, sizeof(buf)); |
| 1654 | if (proxyuser != NULL && |
| 1655 | strncmp(buf, "HTTP/1.0 407 ", 12) == 0) { |
| 1656 | if (authretry > 1) { |
| 1657 | fprintf(stderr, "Proxy authentication " |
| 1658 | "failed\n"); |
| 1659 | } |
| 1660 | close(proxyfd); |
| 1661 | goto again; |
| 1662 | } else if (strncmp(buf, "HTTP/1.0 200 ", 12) != 0 && |
| 1663 | strncmp(buf, "HTTP/1.1 200 ", 12) != 0) |
| 1664 | errx(1, "Proxy error: \"%s\"", buf); |
| 1665 | |
| 1666 | /* Headers continue until we hit an empty line */ |
| 1667 | for (r = 0; r < HTTP_MAXHDRS; r++) { |
| 1668 | proxy_read_line(proxyfd, buf, sizeof(buf)); |
| 1669 | if (*buf == '\0') |
| 1670 | break; |
| 1671 | } |
| 1672 | if (*buf != '\0') |
| 1673 | errx(1, "Too many proxy headers received"); |
| 1674 | } else |
| 1675 | errx(1, "Unknown proxy protocol %d", socksv); |
| 1676 | |
| 1677 | return (proxyfd); |
| 1678 | } |
| 1679 | |