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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
47#include <errno.h>
48#include <netdb.h>
49#include <stdarg.h>
50#include <stdio.h>
51#include <stdlib.h>
52#include <string.h>
53#include <unistd.h>
54#include <fcntl.h>
55#include <limits.h>
56#include "atomicio.h"
57
58#ifdef HAVE_POLL_H
59#include <poll.h>
60#else
61# ifdef HAVE_SYS_POLL_H
62# include <sys/poll.h>
63# endif
64#endif
65
66#ifndef SUN_LEN
67#define SUN_LEN(su) \
68 (sizeof(*(su)) - sizeof((su)->sun_path) + strlen((su)->sun_path))
69#endif
70
71#define PORT_MAX 65535
72#define PORT_MAX_LEN 6
73#define UNIX_DG_TMP_SOCKET_SIZE 19
74
75#define POLL_STDIN 0
76#define POLL_NETOUT 1
77#define POLL_NETIN 2
78#define POLL_STDOUT 3
79#define BUFSIZE 16384
80
81/* Command Line Options */
82int dflag; /* detached, no stdin */
83int Fflag; /* fdpass sock to stdout */
84unsigned int iflag; /* Interval Flag */
85int kflag; /* More than one connect */
86int lflag; /* Bind to local port */
87int Nflag; /* shutdown() network socket */
88int nflag; /* Don't do name look up */
89char *Pflag; /* Proxy username */
90char *pflag; /* Localport flag */
91int rflag; /* Random ports flag */
92char *sflag; /* Source Address */
93int tflag; /* Telnet Emulation */
94int uflag; /* UDP - Default to TCP */
95int vflag; /* Verbosity */
96int xflag; /* Socks proxy */
97int zflag; /* Port Scan Flag */
98int Dflag; /* sodebug */
99int Iflag; /* TCP receive buffer size */
100int Oflag; /* TCP send buffer size */
101int Sflag; /* TCP MD5 signature option */
102int Tflag = -1; /* IP Type of Service */
103int rtableid = -1;
104
105int timeout = -1;
106int family = AF_UNSPEC;
107char *portlist[PORT_MAX+1];
108char *unix_dg_tmp_socket;
109
110void atelnet(int, unsigned char *, unsigned int);
111void build_ports(char *);
112void help(void);
113int local_listen(char *, char *, struct addrinfo);
114void readwrite(int);
115void fdpass(int nfd) __attribute__((noreturn));
116int remote_connect(const char *, const char *, struct addrinfo);
117int timeout_connect(int, const struct sockaddr *, socklen_t);
118int socks_connect(const char *, const char *, struct addrinfo,
119 const char *, const char *, struct addrinfo, int, const char *);
120int udptest(int);
121int unix_bind(char *);
122int unix_connect(char *);
123int unix_listen(char *);
124void set_common_sockopts(int);
125int map_tos(char *, int *);
126void report_connect(const struct sockaddr *, socklen_t);
127void usage(int);
128ssize_t drainbuf(int, unsigned char *, size_t *);
129ssize_t fillbuf(int, unsigned char *, size_t *);
130
131static void err(int, const char *, ...) __attribute__((format(printf, 2, 3)));
132static void errx(int, const char *, ...) __attribute__((format(printf, 2, 3)));
133static void warn(const char *, ...) __attribute__((format(printf, 1, 2)));
134
135static void
136err(int r, const char *fmt, ...)
137{
138 va_list args;
139
140 va_start(args, fmt);
141 fprintf(stderr, "%s: ", strerror(errno));
142 vfprintf(stderr, fmt, args);
143 fputc('\n', stderr);
144 va_end(args);
145 exit(r);
146}
147
148static void
149errx(int r, const char *fmt, ...)
150{
151 va_list args;
152
153 va_start(args, fmt);
154 vfprintf(stderr, fmt, args);
155 fputc('\n', stderr);
156 va_end(args);
157 exit(r);
158}
159
160static void
161warn(const char *fmt, ...)
162{
163 va_list args;
164
165 va_start(args, fmt);
166 fprintf(stderr, "%s: ", strerror(errno));
167 vfprintf(stderr, fmt, args);
168 fputc('\n', stderr);
169 va_end(args);
170}
171
172int
173main(int argc, char *argv[])
174{
175 int ch, s, ret, socksv;
176 char *host, *uport;
177 struct addrinfo hints;
178 struct servent *sv;
179 socklen_t len;
180 struct sockaddr_storage cliaddr;
181 char *proxy = NULL;
182 const char *errstr, *proxyhost = "", *proxyport = NULL;
183 struct addrinfo proxyhints;
184 char unix_dg_tmp_socket_buf[UNIX_DG_TMP_SOCKET_SIZE];
185
186 ret = 1;
187 s = 0;
188 socksv = 5;
189 host = NULL;
190 uport = NULL;
191 sv = NULL;
192
193 while ((ch = getopt(argc, argv,
194 "46DdFhI:i:klNnO:P:p:rSs:tT:UuV:vw:X:x:z")) != -1) {
195 switch (ch) {
196 case '4':
197 family = AF_INET;
198 break;
199 case '6':
200 family = AF_INET6;
201 break;
202 case 'U':
203 family = AF_UNIX;
204 break;
205 case 'X':
206 if (strcasecmp(optarg, "connect") == 0)
207 socksv = -1; /* HTTP proxy CONNECT */
208 else if (strcmp(optarg, "4") == 0)
209 socksv = 4; /* SOCKS v.4 */
210 else if (strcmp(optarg, "5") == 0)
211 socksv = 5; /* SOCKS v.5 */
212 else
213 errx(1, "unsupported proxy protocol");
214 break;
215 case 'd':
216 dflag = 1;
217 break;
218 case 'F':
219 Fflag = 1;
220 break;
221 case 'h':
222 help();
223 break;
224 case 'i':
225 iflag = strtonum(optarg, 0, UINT_MAX, &errstr);
226 if (errstr)
227 errx(1, "interval %s: %s", errstr, optarg);
228 break;
229 case 'k':
230 kflag = 1;
231 break;
232 case 'l':
233 lflag = 1;
234 break;
235 case 'N':
236 Nflag = 1;
237 break;
238 case 'n':
239 nflag = 1;
240 break;
241 case 'P':
242 Pflag = optarg;
243 break;
244 case 'p':
245 pflag = optarg;
246 break;
247 case 'r':
248 rflag = 1;
249 break;
250 case 's':
251 sflag = optarg;
252 break;
253 case 't':
254 tflag = 1;
255 break;
256 case 'u':
257 uflag = 1;
258 break;
259#ifdef SO_RTABLE
260 case 'V':
261 rtableid = (int)strtonum(optarg, 0,
262 RT_TABLEID_MAX, &errstr);
263 if (errstr)
264 errx(1, "rtable %s: %s", errstr, optarg);
265 break;
266#endif
267 case 'v':
268 vflag = 1;
269 break;
270 case 'w':
271 timeout = strtonum(optarg, 0, INT_MAX / 1000, &errstr);
272 if (errstr)
273 errx(1, "timeout %s: %s", errstr, optarg);
274 timeout *= 1000;
275 break;
276 case 'x':
277 xflag = 1;
278 if ((proxy = strdup(optarg)) == NULL)
279 errx(1, "strdup");
280 break;
281 case 'z':
282 zflag = 1;
283 break;
284 case 'D':
285 Dflag = 1;
286 break;
287 case 'I':
288 Iflag = strtonum(optarg, 1, 65536 << 14, &errstr);
289 if (errstr != NULL)
290 errx(1, "TCP receive window %s: %s",
291 errstr, optarg);
292 break;
293 case 'O':
294 Oflag = strtonum(optarg, 1, 65536 << 14, &errstr);
295 if (errstr != NULL)
296 errx(1, "TCP send window %s: %s",
297 errstr, optarg);
298 break;
299 case 'S':
300 Sflag = 1;
301 break;
302 case 'T':
303 errstr = NULL;
304 errno = 0;
305 if (map_tos(optarg, &Tflag))
306 break;
307 if (strlen(optarg) > 1 && optarg[0] == '0' &&
308 optarg[1] == 'x')
309 Tflag = (int)strtol(optarg, NULL, 16);
310 else
311 Tflag = (int)strtonum(optarg, 0, 255,
312 &errstr);
313 if (Tflag < 0 || Tflag > 255 || errstr || errno)
314 errx(1, "illegal tos value %s", optarg);
315 break;
316 default:
317 usage(1);
318 }
319 }
320 argc -= optind;
321 argv += optind;
322
323 /* Cruft to make sure options are clean, and used properly. */
324 if (argv[0] && !argv[1] && family == AF_UNIX) {
325 host = argv[0];
326 uport = NULL;
327 } else if (argv[0] && !argv[1]) {
328 if (!lflag)
329 usage(1);
330 uport = argv[0];
331 host = NULL;
332 } else if (argv[0] && argv[1]) {
333 host = argv[0];
334 uport = argv[1];
335 } else
336 usage(1);
337
338 if (lflag && sflag)
339 errx(1, "cannot use -s and -l");
340 if (lflag && pflag)
341 errx(1, "cannot use -p and -l");
342 if (lflag && zflag)
343 errx(1, "cannot use -z and -l");
344 if (!lflag && kflag)
345 errx(1, "must use -l with -k");
346
347 /* Get name of temporary socket for unix datagram client */
348 if ((family == AF_UNIX) && uflag && !lflag) {
349 if (sflag) {
350 unix_dg_tmp_socket = sflag;
351 } else {
352 strlcpy(unix_dg_tmp_socket_buf, "/tmp/nc.XXXXXXXXXX",
353 UNIX_DG_TMP_SOCKET_SIZE);
354 if (mktemp(unix_dg_tmp_socket_buf) == NULL)
355 err(1, "mktemp");
356 unix_dg_tmp_socket = unix_dg_tmp_socket_buf;
357 }
358 }
359
360 /* Initialize addrinfo structure. */
361 if (family != AF_UNIX) {
362 memset(&hints, 0, sizeof(struct addrinfo));
363 hints.ai_family = family;
364 hints.ai_socktype = uflag ? SOCK_DGRAM : SOCK_STREAM;
365 hints.ai_protocol = uflag ? IPPROTO_UDP : IPPROTO_TCP;
366 if (nflag)
367 hints.ai_flags |= AI_NUMERICHOST;
368 }
369
370 if (xflag) {
371 if (uflag)
372 errx(1, "no proxy support for UDP mode");
373
374 if (lflag)
375 errx(1, "no proxy support for listen");
376
377 if (family == AF_UNIX)
378 errx(1, "no proxy support for unix sockets");
379
380 /* XXX IPv6 transport to proxy would probably work */
381 if (family == AF_INET6)
382 errx(1, "no proxy support for IPv6");
383
384 if (sflag)
385 errx(1, "no proxy support for local source address");
386
387 proxyhost = strsep(&proxy, ":");
388 proxyport = proxy;
389
390 memset(&proxyhints, 0, sizeof(struct addrinfo));
391 proxyhints.ai_family = family;
392 proxyhints.ai_socktype = SOCK_STREAM;
393 proxyhints.ai_protocol = IPPROTO_TCP;
394 if (nflag)
395 proxyhints.ai_flags |= AI_NUMERICHOST;
396 }
397
398 if (lflag) {
399 int connfd;
400 ret = 0;
401
402 if (family == AF_UNIX) {
403 if (uflag)
404 s = unix_bind(host);
405 else
406 s = unix_listen(host);
407 }
408
409 /* Allow only one connection at a time, but stay alive. */
410 for (;;) {
411 if (family != AF_UNIX)
412 s = local_listen(host, uport, hints);
413 if (s < 0)
414 err(1, "local_listen");
415 /*
416 * For UDP and -k, don't connect the socket, let it
417 * receive datagrams from multiple socket pairs.
418 */
419 if (uflag && kflag)
420 readwrite(s);
421 /*
422 * For UDP and not -k, we will use recvfrom() initially
423 * to wait for a caller, then use the regular functions
424 * to talk to the caller.
425 */
426 else if (uflag && !kflag) {
427 int rv, plen;
428 char buf[16384];
429 struct sockaddr_storage z;
430
431 len = sizeof(z);
432 plen = 2048;
433 rv = recvfrom(s, buf, plen, MSG_PEEK,
434 (struct sockaddr *)&z, &len);
435 if (rv < 0)
436 err(1, "recvfrom");
437
438 rv = connect(s, (struct sockaddr *)&z, len);
439 if (rv < 0)
440 err(1, "connect");
441
442 if (vflag)
443 report_connect((struct sockaddr *)&z, len);
444
445 readwrite(s);
446 } else {
447 len = sizeof(cliaddr);
448 connfd = accept(s, (struct sockaddr *)&cliaddr,
449 &len);
450 if (connfd == -1) {
451 /* For now, all errnos are fatal */
452 err(1, "accept");
453 }
454 if (vflag)
455 report_connect((struct sockaddr *)&cliaddr, len);
456
457 readwrite(connfd);
458 close(connfd);
459 }
460
461 if (family != AF_UNIX)
462 close(s);
463 else if (uflag) {
464 if (connect(s, NULL, 0) < 0)
465 err(1, "connect");
466 }
467
468 if (!kflag)
469 break;
470 }
471 } else if (family == AF_UNIX) {
472 ret = 0;
473
474 if ((s = unix_connect(host)) > 0 && !zflag) {
475 readwrite(s);
476 close(s);
477 } else
478 ret = 1;
479
480 if (uflag)
481 unlink(unix_dg_tmp_socket);
482 exit(ret);
483
484 } else {
485 int i = 0;
486
487 /* Construct the portlist[] array. */
488 build_ports(uport);
489
490 /* Cycle through portlist, connecting to each port. */
491 for (i = 0; portlist[i] != NULL; i++) {
492 if (s)
493 close(s);
494
495 if (xflag)
496 s = socks_connect(host, portlist[i], hints,
497 proxyhost, proxyport, proxyhints, socksv,
498 Pflag);
499 else
500 s = remote_connect(host, portlist[i], hints);
501
502 if (s < 0)
503 continue;
504
505 ret = 0;
506 if (vflag || zflag) {
507 /* For UDP, make sure we are connected. */
508 if (uflag) {
509 if (udptest(s) == -1) {
510 ret = 1;
511 continue;
512 }
513 }
514
515 /* Don't look up port if -n. */
516 if (nflag)
517 sv = NULL;
518 else {
519 sv = getservbyport(
520 ntohs(atoi(portlist[i])),
521 uflag ? "udp" : "tcp");
522 }
523
524 fprintf(stderr,
525 "Connection to %s %s port [%s/%s] "
526 "succeeded!\n", host, portlist[i],
527 uflag ? "udp" : "tcp",
528 sv ? sv->s_name : "*");
529 }
530 if (Fflag)
531 fdpass(s);
532 else if (!zflag)
533 readwrite(s);
534 }
535 }
536
537 if (s)
538 close(s);
539
540 exit(ret);
541}
542
543/*
544 * unix_bind()
545 * Returns a unix socket bound to the given path
546 */
547int
548unix_bind(char *path)
549{
550 struct sockaddr_un sun_sa;
551 int s;
552
553 /* Create unix domain socket. */
554 if ((s = socket(AF_UNIX, uflag ? SOCK_DGRAM : SOCK_STREAM,
555 0)) < 0)
556 return (-1);
557
558 memset(&sun_sa, 0, sizeof(struct sockaddr_un));
559 sun_sa.sun_family = AF_UNIX;
560
561 if (strlcpy(sun_sa.sun_path, path, sizeof(sun_sa.sun_path)) >=
562 sizeof(sun_sa.sun_path)) {
563 close(s);
564 errno = ENAMETOOLONG;
565 return (-1);
566 }
567
568 if (bind(s, (struct sockaddr *)&sun_sa, SUN_LEN(&sun_sa)) < 0) {
569 close(s);
570 return (-1);
571 }
572 return (s);
573}
574
575/*
576 * unix_connect()
577 * Returns a socket connected to a local unix socket. Returns -1 on failure.
578 */
579int
580unix_connect(char *path)
581{
582 struct sockaddr_un sun_sa;
583 int s;
584
585 if (uflag) {
586 if ((s = unix_bind(unix_dg_tmp_socket)) < 0)
587 return (-1);
588 } else {
589 if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
590 return (-1);
591 }
592 (void)fcntl(s, F_SETFD, FD_CLOEXEC);
593
594 memset(&sun_sa, 0, sizeof(struct sockaddr_un));
595 sun_sa.sun_family = AF_UNIX;
596
597 if (strlcpy(sun_sa.sun_path, path, sizeof(sun_sa.sun_path)) >=
598 sizeof(sun_sa.sun_path)) {
599 close(s);
600 errno = ENAMETOOLONG;
601 return (-1);
602 }
603 if (connect(s, (struct sockaddr *)&sun_sa, SUN_LEN(&sun_sa)) < 0) {
604 close(s);
605 return (-1);
606 }
607 return (s);
608
609}
610
611/*
612 * unix_listen()
613 * Create a unix domain socket, and listen on it.
614 */
615int
616unix_listen(char *path)
617{
618 int s;
619 if ((s = unix_bind(path)) < 0)
620 return (-1);
621
622 if (listen(s, 5) < 0) {
623 close(s);
624 return (-1);
625 }
626 return (s);
627}
628
629/*
630 * remote_connect()
631 * Returns a socket connected to a remote host. Properly binds to a local
632 * port or source address if needed. Returns -1 on failure.
633 */
634int
635remote_connect(const char *host, const char *port, struct addrinfo hints)
636{
637 struct addrinfo *res, *res0;
638 int s, error;
639#if defined(SO_RTABLE) || defined(SO_BINDANY)
640 int on = 1;
641#endif
642
643 if ((error = getaddrinfo(host, port, &hints, &res)))
644 errx(1, "getaddrinfo: %s", gai_strerror(error));
645
646 res0 = res;
647 do {
648 if ((s = socket(res0->ai_family, res0->ai_socktype,
649 res0->ai_protocol)) < 0)
650 continue;
651
652#ifdef SO_RTABLE
653 if (rtableid >= 0 && (setsockopt(s, SOL_SOCKET, SO_RTABLE,
654 &rtableid, sizeof(rtableid)) == -1))
655 err(1, "setsockopt SO_RTABLE");
656#endif
657 /* Bind to a local port or source address if specified. */
658 if (sflag || pflag) {
659 struct addrinfo ahints, *ares;
660
661#ifdef SO_BINDANY
662 /* try SO_BINDANY, but don't insist */
663 setsockopt(s, SOL_SOCKET, SO_BINDANY, &on, sizeof(on));
664#endif
665 memset(&ahints, 0, sizeof(struct addrinfo));
666 ahints.ai_family = res0->ai_family;
667 ahints.ai_socktype = uflag ? SOCK_DGRAM : SOCK_STREAM;
668 ahints.ai_protocol = uflag ? IPPROTO_UDP : IPPROTO_TCP;
669 ahints.ai_flags = AI_PASSIVE;
670 if ((error = getaddrinfo(sflag, pflag, &ahints, &ares)))
671 errx(1, "getaddrinfo: %s", gai_strerror(error));
672
673 if (bind(s, (struct sockaddr *)ares->ai_addr,
674 ares->ai_addrlen) < 0)
675 err(1, "bind failed");
676 freeaddrinfo(ares);
677 }
678
679 set_common_sockopts(s);
680
681 if (timeout_connect(s, res0->ai_addr, res0->ai_addrlen) == 0)
682 break;
683 else if (vflag)
684 warn("connect to %s port %s (%s) failed", host, port,
685 uflag ? "udp" : "tcp");
686
687 close(s);
688 s = -1;
689 } while ((res0 = res0->ai_next) != NULL);
690
691 freeaddrinfo(res);
692
693 return (s);
694}
695
696int
697timeout_connect(int s, const struct sockaddr *name, socklen_t namelen)
698{
699 struct pollfd pfd;
700 socklen_t optlen;
701 int flags = 0, optval;
702 int ret;
703
704 if (timeout != -1) {
705 flags = fcntl(s, F_GETFL, 0);
706 if (fcntl(s, F_SETFL, flags | O_NONBLOCK) == -1)
707 err(1, "set non-blocking mode");
708 }
709
710 if ((ret = connect(s, name, namelen)) != 0 && errno == EINPROGRESS) {
711 pfd.fd = s;
712 pfd.events = POLLOUT;
713 if ((ret = poll(&pfd, 1, timeout)) == 1) {
714 optlen = sizeof(optval);
715 if ((ret = getsockopt(s, SOL_SOCKET, SO_ERROR,
716 &optval, &optlen)) == 0) {
717 errno = optval;
718 ret = optval == 0 ? 0 : -1;
719 }
720 } else if (ret == 0) {
721 errno = ETIMEDOUT;
722 ret = -1;
723 } else
724 err(1, "poll failed");
725 }
726
727 if (timeout != -1 && fcntl(s, F_SETFL, flags) == -1)
728 err(1, "restoring flags");
729
730 return (ret);
731}
732
733/*
734 * local_listen()
735 * Returns a socket listening on a local port, binds to specified source
736 * address. Returns -1 on failure.
737 */
738int
739local_listen(char *host, char *port, struct addrinfo hints)
740{
741 struct addrinfo *res, *res0;
742 int s, ret, x = 1;
743 int error;
744
745 /* Allow nodename to be null. */
746 hints.ai_flags |= AI_PASSIVE;
747
748 /*
749 * In the case of binding to a wildcard address
750 * default to binding to an ipv4 address.
751 */
752 if (host == NULL && hints.ai_family == AF_UNSPEC)
753 hints.ai_family = AF_INET;
754
755 if ((error = getaddrinfo(host, port, &hints, &res)))
756 errx(1, "getaddrinfo: %s", gai_strerror(error));
757
758 res0 = res;
759 do {
760 if ((s = socket(res0->ai_family, res0->ai_socktype,
761 res0->ai_protocol)) < 0)
762 continue;
763
764#ifdef SO_RTABLE
765 if (rtableid >= 0 && (setsockopt(s, SOL_SOCKET, SO_RTABLE,
766 &rtableid, sizeof(rtableid)) == -1))
767 err(1, "setsockopt SO_RTABLE");
768#endif
769#ifdef SO_REUSEPORT
770 ret = setsockopt(s, SOL_SOCKET, SO_REUSEPORT, &x, sizeof(x));
771 if (ret == -1)
772 err(1, "setsockopt");
773#endif
774 set_common_sockopts(s);
775
776 if (bind(s, (struct sockaddr *)res0->ai_addr,
777 res0->ai_addrlen) == 0)
778 break;
779
780 close(s);
781 s = -1;
782 } while ((res0 = res0->ai_next) != NULL);
783
784 if (!uflag && s != -1) {
785 if (listen(s, 1) < 0)
786 err(1, "listen");
787 }
788
789 freeaddrinfo(res);
790
791 return (s);
792}
793
794/*
795 * readwrite()
796 * Loop that polls on the network file descriptor and stdin.
797 */
798void
799readwrite(int net_fd)
800{
801 struct pollfd pfd[4];
802 int stdin_fd = STDIN_FILENO;
803 int stdout_fd = STDOUT_FILENO;
804 unsigned char netinbuf[BUFSIZE];
805 size_t netinbufpos = 0;
806 unsigned char stdinbuf[BUFSIZE];
807 size_t stdinbufpos = 0;
808 int n, num_fds;
809 ssize_t ret;
810
811 /* don't read from stdin if requested */
812 if (dflag)
813 stdin_fd = -1;
814
815 /* stdin */
816 pfd[POLL_STDIN].fd = stdin_fd;
817 pfd[POLL_STDIN].events = POLLIN;
818
819 /* network out */
820 pfd[POLL_NETOUT].fd = net_fd;
821 pfd[POLL_NETOUT].events = 0;
822
823 /* network in */
824 pfd[POLL_NETIN].fd = net_fd;
825 pfd[POLL_NETIN].events = POLLIN;
826
827 /* stdout */
828 pfd[POLL_STDOUT].fd = stdout_fd;
829 pfd[POLL_STDOUT].events = 0;
830
831 while (1) {
832 /* both inputs are gone, buffers are empty, we are done */
833 if (pfd[POLL_STDIN].fd == -1 && pfd[POLL_NETIN].fd == -1
834 && stdinbufpos == 0 && netinbufpos == 0) {
835 close(net_fd);
836 return;
837 }
838 /* both outputs are gone, we can't continue */
839 if (pfd[POLL_NETOUT].fd == -1 && pfd[POLL_STDOUT].fd == -1) {
840 close(net_fd);
841 return;
842 }
843 /* listen and net in gone, queues empty, done */
844 if (lflag && pfd[POLL_NETIN].fd == -1
845 && stdinbufpos == 0 && netinbufpos == 0) {
846 close(net_fd);
847 return;
848 }
849
850 /* help says -i is for "wait between lines sent". We read and
851 * write arbitrary amounts of data, and we don't want to start
852 * scanning for newlines, so this is as good as it gets */
853 if (iflag)
854 sleep(iflag);
855
856 /* poll */
857 num_fds = poll(pfd, 4, timeout);
858
859 /* treat poll errors */
860 if (num_fds == -1) {
861 close(net_fd);
862 err(1, "polling error");
863 }
864
865 /* timeout happened */
866 if (num_fds == 0)
867 return;
868
869 /* treat socket error conditions */
870 for (n = 0; n < 4; n++) {
871 if (pfd[n].revents & (POLLERR|POLLNVAL)) {
872 pfd[n].fd = -1;
873 }
874 }
875 /* reading is possible after HUP */
876 if (pfd[POLL_STDIN].events & POLLIN &&
877 pfd[POLL_STDIN].revents & POLLHUP &&
878 ! (pfd[POLL_STDIN].revents & POLLIN))
879 pfd[POLL_STDIN].fd = -1;
880
881 if (pfd[POLL_NETIN].events & POLLIN &&
882 pfd[POLL_NETIN].revents & POLLHUP &&
883 ! (pfd[POLL_NETIN].revents & POLLIN))
884 pfd[POLL_NETIN].fd = -1;
885
886 if (pfd[POLL_NETOUT].revents & POLLHUP) {
887 if (Nflag)
888 shutdown(pfd[POLL_NETOUT].fd, SHUT_WR);
889 pfd[POLL_NETOUT].fd = -1;
890 }
891 /* if HUP, stop watching stdout */
892 if (pfd[POLL_STDOUT].revents & POLLHUP)
893 pfd[POLL_STDOUT].fd = -1;
894 /* if no net out, stop watching stdin */
895 if (pfd[POLL_NETOUT].fd == -1)
896 pfd[POLL_STDIN].fd = -1;
897 /* if no stdout, stop watching net in */
898 if (pfd[POLL_STDOUT].fd == -1) {
899 if (pfd[POLL_NETIN].fd != -1)
900 shutdown(pfd[POLL_NETIN].fd, SHUT_RD);
901 pfd[POLL_NETIN].fd = -1;
902 }
903
904 /* try to read from stdin */
905 if (pfd[POLL_STDIN].revents & POLLIN && stdinbufpos < BUFSIZE) {
906 ret = fillbuf(pfd[POLL_STDIN].fd, stdinbuf,
907 &stdinbufpos);
908 /* error or eof on stdin - remove from pfd */
909 if (ret == 0 || ret == -1)
910 pfd[POLL_STDIN].fd = -1;
911 /* read something - poll net out */
912 if (stdinbufpos > 0)
913 pfd[POLL_NETOUT].events = POLLOUT;
914 /* filled buffer - remove self from polling */
915 if (stdinbufpos == BUFSIZE)
916 pfd[POLL_STDIN].events = 0;
917 }
918 /* try to write to network */
919 if (pfd[POLL_NETOUT].revents & POLLOUT && stdinbufpos > 0) {
920 ret = drainbuf(pfd[POLL_NETOUT].fd, stdinbuf,
921 &stdinbufpos);
922 if (ret == -1)
923 pfd[POLL_NETOUT].fd = -1;
924 /* buffer empty - remove self from polling */
925 if (stdinbufpos == 0)
926 pfd[POLL_NETOUT].events = 0;
927 /* buffer no longer full - poll stdin again */
928 if (stdinbufpos < BUFSIZE)
929 pfd[POLL_STDIN].events = POLLIN;
930 }
931 /* try to read from network */
932 if (pfd[POLL_NETIN].revents & POLLIN && netinbufpos < BUFSIZE) {
933 ret = fillbuf(pfd[POLL_NETIN].fd, netinbuf,
934 &netinbufpos);
935 if (ret == -1)
936 pfd[POLL_NETIN].fd = -1;
937 /* eof on net in - remove from pfd */
938 if (ret == 0) {
939 shutdown(pfd[POLL_NETIN].fd, SHUT_RD);
940 pfd[POLL_NETIN].fd = -1;
941 }
942 /* read something - poll stdout */
943 if (netinbufpos > 0)
944 pfd[POLL_STDOUT].events = POLLOUT;
945 /* filled buffer - remove self from polling */
946 if (netinbufpos == BUFSIZE)
947 pfd[POLL_NETIN].events = 0;
948 /* handle telnet */
949 if (tflag)
950 atelnet(pfd[POLL_NETIN].fd, netinbuf,
951 netinbufpos);
952 }
953 /* try to write to stdout */
954 if (pfd[POLL_STDOUT].revents & POLLOUT && netinbufpos > 0) {
955 ret = drainbuf(pfd[POLL_STDOUT].fd, netinbuf,
956 &netinbufpos);
957 if (ret == -1)
958 pfd[POLL_STDOUT].fd = -1;
959 /* buffer empty - remove self from polling */
960 if (netinbufpos == 0)
961 pfd[POLL_STDOUT].events = 0;
962 /* buffer no longer full - poll net in again */
963 if (netinbufpos < BUFSIZE)
964 pfd[POLL_NETIN].events = POLLIN;
965 }
966
967 /* stdin gone and queue empty? */
968 if (pfd[POLL_STDIN].fd == -1 && stdinbufpos == 0) {
969 if (pfd[POLL_NETOUT].fd != -1 && Nflag)
970 shutdown(pfd[POLL_NETOUT].fd, SHUT_WR);
971 pfd[POLL_NETOUT].fd = -1;
972 }
973 /* net in gone and queue empty? */
974 if (pfd[POLL_NETIN].fd == -1 && netinbufpos == 0) {
975 pfd[POLL_STDOUT].fd = -1;
976 }
977 }
978}
979
980ssize_t
981drainbuf(int fd, unsigned char *buf, size_t *bufpos)
982{
983 ssize_t n;
984 ssize_t adjust;
985
986 n = write(fd, buf, *bufpos);
987 /* don't treat EAGAIN, EINTR as error */
988 if (n == -1 && (errno == EAGAIN || errno == EINTR))
989 n = -2;
990 if (n <= 0)
991 return n;
992 /* adjust buffer */
993 adjust = *bufpos - n;
994 if (adjust > 0)
995 memmove(buf, buf + n, adjust);
996 *bufpos -= n;
997 return n;
998}
999
1000
1001ssize_t
1002fillbuf(int fd, unsigned char *buf, size_t *bufpos)
1003{
1004 size_t num = BUFSIZE - *bufpos;
1005 ssize_t n;
1006
1007 n = read(fd, buf + *bufpos, num);
1008 /* don't treat EAGAIN, EINTR as error */
1009 if (n == -1 && (errno == EAGAIN || errno == EINTR))
1010 n = -2;
1011 if (n <= 0)
1012 return n;
1013 *bufpos += n;
1014 return n;
1015}
1016
1017/*
1018 * fdpass()
1019 * Pass the connected file descriptor to stdout and exit.
1020 */
1021void
1022fdpass(int nfd)
1023{
1024#if defined(HAVE_SENDMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) || defined(HAVE_CONTROL_IN_MSGHDR))
1025 struct msghdr msg;
1026#ifndef HAVE_ACCRIGHTS_IN_MSGHDR
1027 union {
1028 struct cmsghdr hdr;
1029 char buf[CMSG_SPACE(sizeof(int))];
1030 } cmsgbuf;
1031 struct cmsghdr *cmsg;
1032#endif
1033 struct iovec vec;
1034 char ch = '\0';
1035 struct pollfd pfd;
1036 ssize_t r;
1037
1038 memset(&msg, 0, sizeof(msg));
1039#ifdef HAVE_ACCRIGHTS_IN_MSGHDR
1040 msg.msg_accrights = (caddr_t)&nfd;
1041 msg.msg_accrightslen = sizeof(nfd);
1042#else
1043 memset(&cmsgbuf, 0, sizeof(cmsgbuf));
1044 msg.msg_control = (caddr_t)&cmsgbuf.buf;
1045 msg.msg_controllen = sizeof(cmsgbuf.buf);
1046 cmsg = CMSG_FIRSTHDR(&msg);
1047 cmsg->cmsg_len = CMSG_LEN(sizeof(int));
1048 cmsg->cmsg_level = SOL_SOCKET;
1049 cmsg->cmsg_type = SCM_RIGHTS;
1050 *(int *)CMSG_DATA(cmsg) = nfd;
1051#endif
1052
1053 vec.iov_base = &ch;
1054 vec.iov_len = 1;
1055 msg.msg_iov = &vec;
1056 msg.msg_iovlen = 1;
1057
1058 bzero(&pfd, sizeof(pfd));
1059 pfd.fd = STDOUT_FILENO;
1060 for (;;) {
1061 r = sendmsg(STDOUT_FILENO, &msg, 0);
1062 if (r == -1) {
1063 if (errno == EAGAIN || errno == EINTR) {
1064 pfd.events = POLLOUT;
1065 if (poll(&pfd, 1, -1) == -1)
1066 err(1, "poll");
1067 continue;
1068 }
1069 err(1, "sendmsg");
1070 } else if (r == -1)
1071 errx(1, "sendmsg: unexpected return value %zd", r);
1072 else
1073 break;
1074 }
1075 exit(0);
1076#else
1077 errx(1, "%s: file descriptor passing not supported", __func__);
1078#endif
1079}
1080
1081/* Deal with RFC 854 WILL/WONT DO/DONT negotiation. */
1082void
1083atelnet(int nfd, unsigned char *buf, unsigned int size)
1084{
1085 unsigned char *p, *end;
1086 unsigned char obuf[4];
1087
1088 if (size < 3)
1089 return;
1090 end = buf + size - 2;
1091
1092 for (p = buf; p < end; p++) {
1093 if (*p != IAC)
1094 continue;
1095
1096 obuf[0] = IAC;
1097 p++;
1098 if ((*p == WILL) || (*p == WONT))
1099 obuf[1] = DONT;
1100 else if ((*p == DO) || (*p == DONT))
1101 obuf[1] = WONT;
1102 else
1103 continue;
1104
1105 p++;
1106 obuf[2] = *p;
1107 if (atomicio(vwrite, nfd, obuf, 3) != 3)
1108 warn("Write Error!");
1109 }
1110}
1111
1112/*
1113 * build_ports()
1114 * Build an array of ports in portlist[], listing each port
1115 * that we should try to connect to.
1116 */
1117void
1118build_ports(char *p)
1119{
1120 const char *errstr;
1121 char *n;
1122 int hi, lo, cp;
1123 int x = 0;
1124
1125 if ((n = strchr(p, '-')) != NULL) {
1126 *n = '\0';
1127 n++;
1128
1129 /* Make sure the ports are in order: lowest->highest. */
1130 hi = strtonum(n, 1, PORT_MAX, &errstr);
1131 if (errstr)
1132 errx(1, "port number %s: %s", errstr, n);
1133 lo = strtonum(p, 1, PORT_MAX, &errstr);
1134 if (errstr)
1135 errx(1, "port number %s: %s", errstr, p);
1136
1137 if (lo > hi) {
1138 cp = hi;
1139 hi = lo;
1140 lo = cp;
1141 }
1142
1143 /* Load ports sequentially. */
1144 for (cp = lo; cp <= hi; cp++) {
1145 portlist[x] = calloc(1, PORT_MAX_LEN);
1146 if (portlist[x] == NULL)
1147 errx(1, "calloc");
1148 snprintf(portlist[x], PORT_MAX_LEN, "%d", cp);
1149 x++;
1150 }
1151
1152 /* Randomly swap ports. */
1153 if (rflag) {
1154 int y;
1155 char *c;
1156
1157 for (x = 0; x <= (hi - lo); x++) {
1158 y = (arc4random() & 0xFFFF) % (hi - lo);
1159 c = portlist[x];
1160 portlist[x] = portlist[y];
1161 portlist[y] = c;
1162 }
1163 }
1164 } else {
1165 hi = strtonum(p, 1, PORT_MAX, &errstr);
1166 if (errstr)
1167 errx(1, "port number %s: %s", errstr, p);
1168 portlist[0] = strdup(p);
1169 if (portlist[0] == NULL)
1170 errx(1, "strdup");
1171 }
1172}
1173
1174/*
1175 * udptest()
1176 * Do a few writes to see if the UDP port is there.
1177 * Fails once PF state table is full.
1178 */
1179int
1180udptest(int s)
1181{
1182 int i, ret;
1183
1184 for (i = 0; i <= 3; i++) {
1185 if (write(s, "X", 1) == 1)
1186 ret = 1;
1187 else
1188 ret = -1;
1189 }
1190 return (ret);
1191}
1192
1193void
1194set_common_sockopts(int s)
1195{
1196 int x = 1;
1197
1198#ifdef TCP_MD5SIG
1199 if (Sflag) {
1200 if (setsockopt(s, IPPROTO_TCP, TCP_MD5SIG,
1201 &x, sizeof(x)) == -1)
1202 err(1, "setsockopt");
1203 }
1204#endif
1205 if (Dflag) {
1206 if (setsockopt(s, SOL_SOCKET, SO_DEBUG,
1207 &x, sizeof(x)) == -1)
1208 err(1, "setsockopt");
1209 }
1210 if (Tflag != -1) {
1211 if (setsockopt(s, IPPROTO_IP, IP_TOS,
1212 &Tflag, sizeof(Tflag)) == -1)
1213 err(1, "set IP ToS");
1214 }
1215 if (Iflag) {
1216 if (setsockopt(s, SOL_SOCKET, SO_RCVBUF,
1217 &Iflag, sizeof(Iflag)) == -1)
1218 err(1, "set TCP receive buffer size");
1219 }
1220 if (Oflag) {
1221 if (setsockopt(s, SOL_SOCKET, SO_SNDBUF,
1222 &Oflag, sizeof(Oflag)) == -1)
1223 err(1, "set TCP send buffer size");
1224 }
1225}
1226
1227int
1228map_tos(char *s, int *val)
1229{
1230 /* DiffServ Codepoints and other TOS mappings */
1231 const struct toskeywords {
1232 const char *keyword;
1233 int val;
1234 } *t, toskeywords[] = {
1235 { "af11", IPTOS_DSCP_AF11 },
1236 { "af12", IPTOS_DSCP_AF12 },
1237 { "af13", IPTOS_DSCP_AF13 },
1238 { "af21", IPTOS_DSCP_AF21 },
1239 { "af22", IPTOS_DSCP_AF22 },
1240 { "af23", IPTOS_DSCP_AF23 },
1241 { "af31", IPTOS_DSCP_AF31 },
1242 { "af32", IPTOS_DSCP_AF32 },
1243 { "af33", IPTOS_DSCP_AF33 },
1244 { "af41", IPTOS_DSCP_AF41 },
1245 { "af42", IPTOS_DSCP_AF42 },
1246 { "af43", IPTOS_DSCP_AF43 },
1247 { "critical", IPTOS_PREC_CRITIC_ECP },
1248 { "cs0", IPTOS_DSCP_CS0 },
1249 { "cs1", IPTOS_DSCP_CS1 },
1250 { "cs2", IPTOS_DSCP_CS2 },
1251 { "cs3", IPTOS_DSCP_CS3 },
1252 { "cs4", IPTOS_DSCP_CS4 },
1253 { "cs5", IPTOS_DSCP_CS5 },
1254 { "cs6", IPTOS_DSCP_CS6 },
1255 { "cs7", IPTOS_DSCP_CS7 },
1256 { "ef", IPTOS_DSCP_EF },
1257 { "inetcontrol", IPTOS_PREC_INTERNETCONTROL },
1258 { "lowdelay", IPTOS_LOWDELAY },
1259 { "netcontrol", IPTOS_PREC_NETCONTROL },
1260 { "reliability", IPTOS_RELIABILITY },
1261 { "throughput", IPTOS_THROUGHPUT },
1262 { NULL, -1 },
1263 };
1264
1265 for (t = toskeywords; t->keyword != NULL; t++) {
1266 if (strcmp(s, t->keyword) == 0) {
1267 *val = t->val;
1268 return (1);
1269 }
1270 }
1271
1272 return (0);
1273}
1274
1275void
1276report_connect(const struct sockaddr *sa, socklen_t salen)
1277{
1278 char remote_host[NI_MAXHOST];
1279 char remote_port[NI_MAXSERV];
1280 int herr;
1281 int flags = NI_NUMERICSERV;
1282
1283 if (nflag)
1284 flags |= NI_NUMERICHOST;
1285
1286 if ((herr = getnameinfo(sa, salen,
1287 remote_host, sizeof(remote_host),
1288 remote_port, sizeof(remote_port),
1289 flags)) != 0) {
1290 if (herr == EAI_SYSTEM)
1291 err(1, "getnameinfo");
1292 else
1293 errx(1, "getnameinfo: %s", gai_strerror(herr));
1294 }
1295
1296 fprintf(stderr,
1297 "Connection from %s %s "
1298 "received!\n", remote_host, remote_port);
1299}
1300
1301void
1302help(void)
1303{
1304 usage(0);
1305 fprintf(stderr, "\tCommand Summary:\n\
1306 \t-4 Use IPv4\n\
1307 \t-6 Use IPv6\n\
1308 \t-D Enable the debug socket option\n\
1309 \t-d Detach from stdin\n\
1310 \t-F Pass socket fd\n\
1311 \t-h This help text\n\
1312 \t-I length TCP receive buffer length\n\
1313 \t-i secs\t Delay interval for lines sent, ports scanned\n\
1314 \t-k Keep inbound sockets open for multiple connects\n\
1315 \t-l Listen mode, for inbound connects\n\
1316 \t-N Shutdown the network socket after EOF on stdin\n\
1317 \t-n Suppress name/port resolutions\n\
1318 \t-O length TCP send buffer length\n\
1319 \t-P proxyuser\tUsername for proxy authentication\n\
1320 \t-p port\t Specify local port for remote connects\n\
1321 \t-r Randomize remote ports\n\
1322 \t-S Enable the TCP MD5 signature option\n\
1323 \t-s addr\t Local source address\n\
1324 \t-T toskeyword\tSet IP Type of Service\n\
1325 \t-t Answer TELNET negotiation\n\
1326 \t-U Use UNIX domain socket\n\
1327 \t-u UDP mode\n\
1328 \t-V rtable Specify alternate routing table\n\
1329 \t-v Verbose\n\
1330 \t-w secs\t Timeout for connects and final net reads\n\
1331 \t-X proto Proxy protocol: \"4\", \"5\" (SOCKS) or \"connect\"\n\
1332 \t-x addr[:port]\tSpecify proxy address and port\n\
1333 \t-z Zero-I/O mode [used for scanning]\n\
1334 Port numbers can be individual or ranges: lo-hi [inclusive]\n");
1335 exit(1);
1336}
1337
1338void
1339usage(int ret)
1340{
1341 fprintf(stderr,
1342 "usage: nc [-46DdFhklNnrStUuvz] [-I length] [-i interval] [-O length]\n"
1343 "\t [-P proxy_username] [-p source_port] [-s source] [-T ToS]\n"
1344 "\t [-V rtable] [-w timeout] [-X proxy_protocol]\n"
1345 "\t [-x proxy_address[:port]] [destination] [port]\n");
1346 if (ret)
1347 exit(1);
1348}
1349
1350/* *** src/usr.bin/nc/socks.c *** */
1351
1352
1353/* $OpenBSD: socks.c,v 1.20 2012/03/08 09:56:28 espie Exp $ */
1354
1355/*
1356 * Copyright (c) 1999 Niklas Hallqvist. All rights reserved.
1357 * Copyright (c) 2004, 2005 Damien Miller. All rights reserved.
1358 *
1359 * Redistribution and use in source and binary forms, with or without
1360 * modification, are permitted provided that the following conditions
1361 * are met:
1362 * 1. Redistributions of source code must retain the above copyright
1363 * notice, this list of conditions and the following disclaimer.
1364 * 2. Redistributions in binary form must reproduce the above copyright
1365 * notice, this list of conditions and the following disclaimer in the
1366 * documentation and/or other materials provided with the distribution.
1367 *
1368 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
1369 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
1370 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
1371 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
1372 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
1373 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
1374 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
1375 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
1376 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
1377 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1378 */
1379
1380#include <sys/types.h>
1381#include <sys/socket.h>
1382#include <netinet/in.h>
1383#include <arpa/inet.h>
1384
1385#include <errno.h>
1386#include <netdb.h>
1387#include <stdio.h>
1388#include <stdlib.h>
1389#include <string.h>
1390#include <unistd.h>
1391#include <resolv.h>
1392
1393#define SOCKS_PORT "1080"
1394#define HTTP_PROXY_PORT "3128"
1395#define HTTP_MAXHDRS 64
1396#define SOCKS_V5 5
1397#define SOCKS_V4 4
1398#define SOCKS_NOAUTH 0
1399#define SOCKS_NOMETHOD 0xff
1400#define SOCKS_CONNECT 1
1401#define SOCKS_IPV4 1
1402#define SOCKS_DOMAIN 3
1403#define SOCKS_IPV6 4
1404
1405int remote_connect(const char *, const char *, struct addrinfo);
1406int socks_connect(const char *, const char *, struct addrinfo,
1407 const char *, const char *, struct addrinfo, int,
1408 const char *);
1409
1410static int
1411decode_addrport(const char *h, const char *p, struct sockaddr *addr,
1412 socklen_t addrlen, int v4only, int numeric)
1413{
1414 int r;
1415 struct addrinfo hints, *res;
1416
1417 bzero(&hints, sizeof(hints));
1418 hints.ai_family = v4only ? PF_INET : PF_UNSPEC;
1419 hints.ai_flags = numeric ? AI_NUMERICHOST : 0;
1420 hints.ai_socktype = SOCK_STREAM;
1421 r = getaddrinfo(h, p, &hints, &res);
1422 /* Don't fatal when attempting to convert a numeric address */
1423 if (r != 0) {
1424 if (!numeric) {
1425 errx(1, "getaddrinfo(\"%.64s\", \"%.64s\"): %s", h, p,
1426 gai_strerror(r));
1427 }
1428 return (-1);
1429 }
1430 if (addrlen < res->ai_addrlen) {
1431 freeaddrinfo(res);
1432 errx(1, "internal error: addrlen < res->ai_addrlen");
1433 }
1434 memcpy(addr, res->ai_addr, res->ai_addrlen);
1435 freeaddrinfo(res);
1436 return (0);
1437}
1438
1439static int
1440proxy_read_line(int fd, char *buf, size_t bufsz)
1441{
1442 size_t off;
1443
1444 for(off = 0;;) {
1445 if (off >= bufsz)
1446 errx(1, "proxy read too long");
1447 if (atomicio(read, fd, buf + off, 1) != 1)
1448 err(1, "proxy read");
1449 /* Skip CR */
1450 if (buf[off] == '\r')
1451 continue;
1452 if (buf[off] == '\n') {
1453 buf[off] = '\0';
1454 break;
1455 }
1456 off++;
1457 }
1458 return (off);
1459}
1460
1461static const char *
1462getproxypass(const char *proxyuser, const char *proxyhost)
1463{
1464 char prompt[512];
1465 static char pw[256];
1466
1467 snprintf(prompt, sizeof(prompt), "Proxy password for %s@%s: ",
1468 proxyuser, proxyhost);
1469 if (readpassphrase(prompt, pw, sizeof(pw), RPP_REQUIRE_TTY) == NULL)
1470 errx(1, "Unable to read proxy passphrase");
1471 return (pw);
1472}
1473
1474int
1475socks_connect(const char *host, const char *port,
1476 struct addrinfo hints __attribute__ ((__unused__)),
1477 const char *proxyhost, const char *proxyport, struct addrinfo proxyhints,
1478 int socksv, const char *proxyuser)
1479{
1480 int proxyfd, r, authretry = 0;
1481 size_t hlen, wlen = 0;
1482 unsigned char buf[1024];
1483 size_t cnt;
1484 struct sockaddr_storage addr;
1485 struct sockaddr_in *in4 = (struct sockaddr_in *)&addr;
1486 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)&addr;
1487 in_port_t serverport;
1488 const char *proxypass = NULL;
1489
1490 if (proxyport == NULL)
1491 proxyport = (socksv == -1) ? HTTP_PROXY_PORT : SOCKS_PORT;
1492
1493 /* Abuse API to lookup port */
1494 if (decode_addrport("0.0.0.0", port, (struct sockaddr *)&addr,
1495 sizeof(addr), 1, 1) == -1)
1496 errx(1, "unknown port \"%.64s\"", port);
1497 serverport = in4->sin_port;
1498
1499 again:
1500 if (authretry++ > 3)
1501 errx(1, "Too many authentication failures");
1502
1503 proxyfd = remote_connect(proxyhost, proxyport, proxyhints);
1504
1505 if (proxyfd < 0)
1506 return (-1);
1507
1508 if (socksv == 5) {
1509 if (decode_addrport(host, port, (struct sockaddr *)&addr,
1510 sizeof(addr), 0, 1) == -1)
1511 addr.ss_family = 0; /* used in switch below */
1512
1513 /* Version 5, one method: no authentication */
1514 buf[0] = SOCKS_V5;
1515 buf[1] = 1;
1516 buf[2] = SOCKS_NOAUTH;
1517 cnt = atomicio(vwrite, proxyfd, buf, 3);
1518 if (cnt != 3)
1519 err(1, "write failed (%zu/3)", cnt);
1520
1521 cnt = atomicio(read, proxyfd, buf, 2);
1522 if (cnt != 2)
1523 err(1, "read failed (%zu/3)", cnt);
1524
1525 if (buf[1] == SOCKS_NOMETHOD)
1526 errx(1, "authentication method negotiation failed");
1527
1528 switch (addr.ss_family) {
1529 case 0:
1530 /* Version 5, connect: domain name */
1531
1532 /* Max domain name length is 255 bytes */
1533 hlen = strlen(host);
1534 if (hlen > 255)
1535 errx(1, "host name too long for SOCKS5");
1536 buf[0] = SOCKS_V5;
1537 buf[1] = SOCKS_CONNECT;
1538 buf[2] = 0;
1539 buf[3] = SOCKS_DOMAIN;
1540 buf[4] = hlen;
1541 memcpy(buf + 5, host, hlen);
1542 memcpy(buf + 5 + hlen, &serverport, sizeof serverport);
1543 wlen = 7 + hlen;
1544 break;
1545 case AF_INET:
1546 /* Version 5, connect: IPv4 address */
1547 buf[0] = SOCKS_V5;
1548 buf[1] = SOCKS_CONNECT;
1549 buf[2] = 0;
1550 buf[3] = SOCKS_IPV4;
1551 memcpy(buf + 4, &in4->sin_addr, sizeof in4->sin_addr);
1552 memcpy(buf + 8, &in4->sin_port, sizeof in4->sin_port);
1553 wlen = 10;
1554 break;
1555 case AF_INET6:
1556 /* Version 5, connect: IPv6 address */
1557 buf[0] = SOCKS_V5;
1558 buf[1] = SOCKS_CONNECT;
1559 buf[2] = 0;
1560 buf[3] = SOCKS_IPV6;
1561 memcpy(buf + 4, &in6->sin6_addr, sizeof in6->sin6_addr);
1562 memcpy(buf + 20, &in6->sin6_port,
1563 sizeof in6->sin6_port);
1564 wlen = 22;
1565 break;
1566 default:
1567 errx(1, "internal error: silly AF");
1568 }
1569
1570 cnt = atomicio(vwrite, proxyfd, buf, wlen);
1571 if (cnt != wlen)
1572 err(1, "write failed (%zu/%zu)", cnt, wlen);
1573
1574 cnt = atomicio(read, proxyfd, buf, 4);
1575 if (cnt != 4)
1576 err(1, "read failed (%zu/4)", cnt);
1577 if (buf[1] != 0)
1578 errx(1, "connection failed, SOCKS error %d", buf[1]);
1579 switch (buf[3]) {
1580 case SOCKS_IPV4:
1581 cnt = atomicio(read, proxyfd, buf + 4, 6);
1582 if (cnt != 6)
1583 err(1, "read failed (%zu/6)", cnt);
1584 break;
1585 case SOCKS_IPV6:
1586 cnt = atomicio(read, proxyfd, buf + 4, 18);
1587 if (cnt != 18)
1588 err(1, "read failed (%zu/18)", cnt);
1589 break;
1590 default:
1591 errx(1, "connection failed, unsupported address type");
1592 }
1593 } else if (socksv == 4) {
1594 /* This will exit on lookup failure */
1595 decode_addrport(host, port, (struct sockaddr *)&addr,
1596 sizeof(addr), 1, 0);
1597
1598 /* Version 4 */
1599 buf[0] = SOCKS_V4;
1600 buf[1] = SOCKS_CONNECT; /* connect */
1601 memcpy(buf + 2, &in4->sin_port, sizeof in4->sin_port);
1602 memcpy(buf + 4, &in4->sin_addr, sizeof in4->sin_addr);
1603 buf[8] = 0; /* empty username */
1604 wlen = 9;
1605
1606 cnt = atomicio(vwrite, proxyfd, buf, wlen);
1607 if (cnt != wlen)
1608 err(1, "write failed (%zu/%zu)", cnt, wlen);
1609
1610 cnt = atomicio(read, proxyfd, buf, 8);
1611 if (cnt != 8)
1612 err(1, "read failed (%zu/8)", cnt);
1613 if (buf[1] != 90)
1614 errx(1, "connection failed, SOCKS error %d", buf[1]);
1615 } else if (socksv == -1) {
1616 /* HTTP proxy CONNECT */
1617
1618 /* Disallow bad chars in hostname */
1619 if (strcspn(host, "\r\n\t []:") != strlen(host))
1620 errx(1, "Invalid hostname");
1621
1622 /* Try to be sane about numeric IPv6 addresses */
1623 if (strchr(host, ':') != NULL) {
1624 r = snprintf(buf, sizeof(buf),
1625 "CONNECT [%s]:%d HTTP/1.0\r\n",
1626 host, ntohs(serverport));
1627 } else {
1628 r = snprintf(buf, sizeof(buf),
1629 "CONNECT %s:%d HTTP/1.0\r\n",
1630 host, ntohs(serverport));
1631 }
1632 if (r == -1 || (size_t)r >= sizeof(buf))
1633 errx(1, "hostname too long");
1634 r = strlen(buf);
1635
1636 cnt = atomicio(vwrite, proxyfd, buf, r);
1637 if (cnt != (size_t)r)
1638 err(1, "write failed (%zu/%d)", cnt, r);
1639
1640 if (authretry > 1) {
1641 char resp[1024];
1642
1643 proxypass = getproxypass(proxyuser, proxyhost);
1644 r = snprintf(buf, sizeof(buf), "%s:%s",
1645 proxyuser, proxypass);
1646 if (r == -1 || (size_t)r >= sizeof(buf) ||
1647 b64_ntop(buf, strlen(buf), resp,
1648 sizeof(resp)) == -1)
1649 errx(1, "Proxy username/password too long");
1650 r = snprintf(buf, sizeof(buf), "Proxy-Authorization: "
1651 "Basic %s\r\n", resp);
1652 if (r == -1 || (size_t)r >= sizeof(buf))
1653 errx(1, "Proxy auth response too long");
1654 r = strlen(buf);
1655 if ((cnt = atomicio(vwrite, proxyfd, buf, r)) != (size_t)r)
1656 err(1, "write failed (%zu/%d)", cnt, r);
1657 }
1658
1659 /* Terminate headers */
1660 if ((r = atomicio(vwrite, proxyfd, "\r\n", 2)) != 2)
1661 err(1, "write failed (2/%d)", r);
1662
1663 /* Read status reply */
1664 proxy_read_line(proxyfd, buf, sizeof(buf));
1665 if (proxyuser != NULL &&
1666 strncmp(buf, "HTTP/1.0 407 ", 12) == 0) {
1667 if (authretry > 1) {
1668 fprintf(stderr, "Proxy authentication "
1669 "failed\n");
1670 }
1671 close(proxyfd);
1672 goto again;
1673 } else if (strncmp(buf, "HTTP/1.0 200 ", 12) != 0 &&
1674 strncmp(buf, "HTTP/1.1 200 ", 12) != 0)
1675 errx(1, "Proxy error: \"%s\"", buf);
1676
1677 /* Headers continue until we hit an empty line */
1678 for (r = 0; r < HTTP_MAXHDRS; r++) {
1679 proxy_read_line(proxyfd, buf, sizeof(buf));
1680 if (*buf == '\0')
1681 break;
1682 }
1683 if (*buf != '\0')
1684 errx(1, "Too many proxy headers received");
1685 } else
1686 errx(1, "Unknown proxy protocol %d", socksv);
1687
1688 return (proxyfd);
1689}
1690
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-11 10:57:10 +0000