Annotation of src/usr.bin/nc/netcat.c, Revision 1.171
1.171 ! mestre 1: /* $OpenBSD: netcat.c,v 1.170 2016/11/06 13:33:30 beck Exp $ */
1.21 ericj 2: /*
3: * Copyright (c) 2001 Eric Jackson <ericj@monkey.org>
1.133 beck 4: * Copyright (c) 2015 Bob Beck. All rights reserved.
1.7 deraadt 5: *
1.21 ericj 6: * Redistribution and use in source and binary forms, with or without
7: * modification, are permitted provided that the following conditions
8: * are met:
1.7 deraadt 9: *
1.21 ericj 10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: * 3. The name of the author may not be used to endorse or promote products
16: * derived from this software without specific prior written permission.
1.7 deraadt 17: *
1.21 ericj 18: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28: */
1.1 deraadt 29:
1.24 ericj 30: /*
31: * Re-written nc(1) for OpenBSD. Original implementation by
1.21 ericj 32: * *Hobbit* <hobbit@avian.org>.
33: */
1.1 deraadt 34:
1.7 deraadt 35: #include <sys/types.h>
1.21 ericj 36: #include <sys/socket.h>
1.113 djm 37: #include <sys/uio.h>
1.42 ericj 38: #include <sys/un.h>
1.21 ericj 39:
1.7 deraadt 40: #include <netinet/in.h>
1.65 markus 41: #include <netinet/tcp.h>
1.83 dtucker 42: #include <netinet/ip.h>
1.21 ericj 43: #include <arpa/telnet.h>
1.29 smart 44:
1.11 ericj 45: #include <err.h>
1.7 deraadt 46: #include <errno.h>
1.129 tobias 47: #include <limits.h>
1.21 ericj 48: #include <netdb.h>
49: #include <poll.h>
1.129 tobias 50: #include <signal.h>
1.13 ericj 51: #include <stdarg.h>
1.21 ericj 52: #include <stdio.h>
1.1 deraadt 53: #include <stdlib.h>
1.21 ericj 54: #include <string.h>
1.149 bcook 55: #include <time.h>
1.5 art 56: #include <unistd.h>
1.133 beck 57: #include <tls.h>
1.79 avsm 58: #include "atomicio.h"
1.51 vincent 59:
1.55 fgsch 60: #define PORT_MAX 65535
1.99 jeremy 61: #define UNIX_DG_TMP_SOCKET_SIZE 19
1.31 ericj 62:
1.125 tedu 63: #define POLL_STDIN 0
64: #define POLL_NETOUT 1
65: #define POLL_NETIN 2
66: #define POLL_STDOUT 3
1.126 tedu 67: #define BUFSIZE 16384
1.159 jsing 68: #define DEFAULT_CA_FILE "/etc/ssl/cert.pem"
1.133 beck 69:
1.170 beck 70: #define TLS_ALL (1 << 1)
1.133 beck 71: #define TLS_NOVERIFY (1 << 2)
72: #define TLS_NONAME (1 << 3)
73: #define TLS_CCERT (1 << 4)
1.167 beck 74: #define TLS_MUSTSTAPLE (1 << 5)
1.125 tedu 75:
1.21 ericj 76: /* Command Line Options */
1.68 tedu 77: int dflag; /* detached, no stdin */
1.113 djm 78: int Fflag; /* fdpass sock to stdout */
1.88 ray 79: unsigned int iflag; /* Interval Flag */
1.21 ericj 80: int kflag; /* More than one connect */
81: int lflag; /* Bind to local port */
1.111 sthen 82: int Nflag; /* shutdown() network socket */
1.67 jmc 83: int nflag; /* Don't do name look up */
1.86 djm 84: char *Pflag; /* Proxy username */
1.21 ericj 85: char *pflag; /* Localport flag */
86: int rflag; /* Random ports flag */
87: char *sflag; /* Source Address */
88: int tflag; /* Telnet Emulation */
89: int uflag; /* UDP - Default to TCP */
90: int vflag; /* Verbosity */
1.34 jakob 91: int xflag; /* Socks proxy */
1.21 ericj 92: int zflag; /* Port Scan Flag */
1.73 markus 93: int Dflag; /* sodebug */
1.90 djm 94: int Iflag; /* TCP receive buffer size */
95: int Oflag; /* TCP send buffer size */
1.65 markus 96: int Sflag; /* TCP MD5 signature option */
1.83 dtucker 97: int Tflag = -1; /* IP Type of Service */
1.117 sthen 98: int rtableid = -1;
1.21 ericj 99:
1.133 beck 100: int usetls; /* use TLS */
101: char *Cflag; /* Public cert file */
102: char *Kflag; /* Private key file */
1.168 beck 103: char *oflag; /* OCSP stapling file */
1.159 jsing 104: char *Rflag = DEFAULT_CA_FILE; /* Root CA file */
1.133 beck 105: int tls_cachanged; /* Using non-default CA file */
106: int TLSopt; /* TLS options */
107: char *tls_expectname; /* required name in peer cert */
108: char *tls_expecthash; /* required hash of peer cert */
109:
1.49 hugh 110: int timeout = -1;
1.21 ericj 111: int family = AF_UNSPEC;
1.63 miod 112: char *portlist[PORT_MAX+1];
1.99 jeremy 113: char *unix_dg_tmp_socket;
1.156 jca 114: int ttl = -1;
115: int minttl = -1;
1.21 ericj 116:
1.40 millert 117: void atelnet(int, unsigned char *, unsigned int);
118: void build_ports(char *);
119: void help(void);
120: int local_listen(char *, char *, struct addrinfo);
1.133 beck 121: void readwrite(int, struct tls *);
1.113 djm 122: void fdpass(int nfd) __attribute__((noreturn));
1.77 otto 123: int remote_connect(const char *, const char *, struct addrinfo);
1.103 fgsch 124: int timeout_connect(int, const struct sockaddr *, socklen_t);
1.86 djm 125: int socks_connect(const char *, const char *, struct addrinfo,
126: const char *, const char *, struct addrinfo, int, const char *);
1.40 millert 127: int udptest(int);
1.136 deraadt 128: int unix_bind(char *, int);
1.42 ericj 129: int unix_connect(char *);
130: int unix_listen(char *);
1.127 jca 131: void set_common_sockopts(int, int);
1.102 haesbaer 132: int map_tos(char *, int *);
1.133 beck 133: int map_tls(char *, int *);
1.151 beck 134: void report_connect(const struct sockaddr *, socklen_t, char *);
1.134 deraadt 135: void report_tls(struct tls *tls_ctx, char * host, char *tls_expectname);
1.40 millert 136: void usage(int);
1.133 beck 137: ssize_t drainbuf(int, unsigned char *, size_t *, struct tls *);
138: ssize_t fillbuf(int, unsigned char *, size_t *, struct tls *);
139: void tls_setup_client(struct tls *, int, char *);
1.134 deraadt 140: struct tls *tls_setup_server(struct tls *, int, char *);
1.1 deraadt 141:
1.21 ericj 142: int
1.37 jakob 143: main(int argc, char *argv[])
1.21 ericj 144: {
1.154 deraadt 145: int ch, s = -1, ret, socksv;
1.88 ray 146: char *host, *uport;
1.21 ericj 147: struct addrinfo hints;
1.29 smart 148: struct servent *sv;
1.21 ericj 149: socklen_t len;
1.76 hshoexer 150: struct sockaddr_storage cliaddr;
1.34 jakob 151: char *proxy;
1.88 ray 152: const char *errstr, *proxyhost = "", *proxyport = NULL;
1.34 jakob 153: struct addrinfo proxyhints;
1.99 jeremy 154: char unix_dg_tmp_socket_buf[UNIX_DG_TMP_SOCKET_SIZE];
1.133 beck 155: struct tls_config *tls_cfg = NULL;
156: struct tls *tls_ctx = NULL;
1.11 ericj 157:
1.29 smart 158: ret = 1;
1.46 markus 159: socksv = 5;
1.29 smart 160: host = NULL;
161: uport = NULL;
162: sv = NULL;
1.129 tobias 163:
164: signal(SIGPIPE, SIG_IGN);
1.29 smart 165:
1.80 mcbride 166: while ((ch = getopt(argc, argv,
1.168 beck 167: "46C:cDde:FH:hI:i:K:klM:m:NnO:o:P:p:R:rSs:T:tUuV:vw:X:x:z")) != -1) {
1.21 ericj 168: switch (ch) {
169: case '4':
170: family = AF_INET;
171: break;
172: case '6':
173: family = AF_INET6;
174: break;
1.42 ericj 175: case 'U':
176: family = AF_UNIX;
177: break;
1.46 markus 178: case 'X':
1.75 djm 179: if (strcasecmp(optarg, "connect") == 0)
180: socksv = -1; /* HTTP proxy CONNECT */
181: else if (strcmp(optarg, "4") == 0)
182: socksv = 4; /* SOCKS v.4 */
183: else if (strcmp(optarg, "5") == 0)
184: socksv = 5; /* SOCKS v.5 */
185: else
186: errx(1, "unsupported proxy protocol");
1.46 markus 187: break;
1.133 beck 188: case 'C':
189: Cflag = optarg;
190: break;
191: case 'c':
192: usetls = 1;
193: break;
1.68 tedu 194: case 'd':
195: dflag = 1;
196: break;
1.133 beck 197: case 'e':
198: tls_expectname = optarg;
199: break;
1.113 djm 200: case 'F':
201: Fflag = 1;
202: break;
1.133 beck 203: case 'H':
204: tls_expecthash = optarg;
205: break;
1.21 ericj 206: case 'h':
207: help();
208: break;
209: case 'i':
1.88 ray 210: iflag = strtonum(optarg, 0, UINT_MAX, &errstr);
211: if (errstr)
212: errx(1, "interval %s: %s", errstr, optarg);
1.21 ericj 213: break;
1.133 beck 214: case 'K':
215: Kflag = optarg;
216: break;
1.21 ericj 217: case 'k':
218: kflag = 1;
219: break;
220: case 'l':
221: lflag = 1;
222: break;
1.156 jca 223: case 'M':
224: ttl = strtonum(optarg, 0, 255, &errstr);
225: if (errstr)
226: errx(1, "ttl is %s", errstr);
227: break;
228: case 'm':
229: minttl = strtonum(optarg, 0, 255, &errstr);
230: if (errstr)
231: errx(1, "minttl is %s", errstr);
232: break;
1.111 sthen 233: case 'N':
234: Nflag = 1;
235: break;
1.21 ericj 236: case 'n':
237: nflag = 1;
238: break;
1.86 djm 239: case 'P':
240: Pflag = optarg;
241: break;
1.21 ericj 242: case 'p':
243: pflag = optarg;
244: break;
1.133 beck 245: case 'R':
246: tls_cachanged = 1;
247: Rflag = optarg;
248: break;
1.21 ericj 249: case 'r':
250: rflag = 1;
251: break;
252: case 's':
253: sflag = optarg;
254: break;
255: case 't':
256: tflag = 1;
257: break;
258: case 'u':
259: uflag = 1;
260: break;
1.93 claudio 261: case 'V':
1.117 sthen 262: rtableid = (int)strtonum(optarg, 0,
1.93 claudio 263: RT_TABLEID_MAX, &errstr);
264: if (errstr)
1.98 guenther 265: errx(1, "rtable %s: %s", errstr, optarg);
1.93 claudio 266: break;
1.21 ericj 267: case 'v':
268: vflag = 1;
269: break;
1.70 deraadt 270: case 'w':
1.88 ray 271: timeout = strtonum(optarg, 0, INT_MAX / 1000, &errstr);
272: if (errstr)
273: errx(1, "timeout %s: %s", errstr, optarg);
1.49 hugh 274: timeout *= 1000;
1.21 ericj 275: break;
1.34 jakob 276: case 'x':
277: xflag = 1;
1.64 deraadt 278: if ((proxy = strdup(optarg)) == NULL)
279: err(1, NULL);
1.34 jakob 280: break;
1.21 ericj 281: case 'z':
282: zflag = 1;
283: break;
1.73 markus 284: case 'D':
285: Dflag = 1;
286: break;
1.90 djm 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;
1.168 beck 299: case 'o':
300: oflag = optarg;
301: break;
1.65 markus 302: case 'S':
303: Sflag = 1;
304: break;
1.83 dtucker 305: case 'T':
1.102 haesbaer 306: errstr = NULL;
307: errno = 0;
308: if (map_tos(optarg, &Tflag))
309: break;
1.133 beck 310: if (map_tls(optarg, &TLSopt))
311: break;
1.102 haesbaer 312: if (strlen(optarg) > 1 && optarg[0] == '0' &&
313: optarg[1] == 'x')
314: Tflag = (int)strtol(optarg, NULL, 16);
315: else
316: Tflag = (int)strtonum(optarg, 0, 255,
317: &errstr);
318: if (Tflag < 0 || Tflag > 255 || errstr || errno)
1.133 beck 319: errx(1, "illegal tos/tls value %s", optarg);
1.83 dtucker 320: break;
1.21 ericj 321: default:
322: usage(1);
323: }
324: }
325: argc -= optind;
326: argv += optind;
1.11 ericj 327:
1.143 deraadt 328: if (rtableid >= 0)
1.142 benno 329: if (setrtable(rtableid) == -1)
330: err(1, "setrtable");
1.143 deraadt 331:
1.142 benno 332: if (family == AF_UNIX) {
1.140 beck 333: if (pledge("stdio rpath wpath cpath tmppath unix", NULL) == -1)
334: err(1, "pledge");
1.143 deraadt 335: } else if (Fflag) {
1.152 beck 336: if (Pflag) {
337: if (pledge("stdio inet dns sendfd tty", NULL) == -1)
338: err(1, "pledge");
339: } else if (pledge("stdio inet dns sendfd", NULL) == -1)
340: err(1, "pledge");
341: } else if (Pflag) {
342: if (pledge("stdio inet dns tty", NULL) == -1)
1.140 beck 343: err(1, "pledge");
1.143 deraadt 344: } else if (usetls) {
1.140 beck 345: if (pledge("stdio rpath inet dns", NULL) == -1)
346: err(1, "pledge");
1.143 deraadt 347: } else if (pledge("stdio inet dns", NULL) == -1)
1.140 beck 348: err(1, "pledge");
349:
1.21 ericj 350: /* Cruft to make sure options are clean, and used properly. */
1.42 ericj 351: if (argv[0] && !argv[1] && family == AF_UNIX) {
352: host = argv[0];
353: uport = NULL;
354: } else if (argv[0] && !argv[1]) {
1.21 ericj 355: if (!lflag)
356: usage(1);
357: uport = argv[0];
358: host = NULL;
359: } else if (argv[0] && argv[1]) {
360: host = argv[0];
361: uport = argv[1];
362: } else
363: usage(1);
1.1 deraadt 364:
1.21 ericj 365: if (lflag && sflag)
366: errx(1, "cannot use -s and -l");
367: if (lflag && pflag)
368: errx(1, "cannot use -p and -l");
369: if (lflag && zflag)
1.32 ericj 370: errx(1, "cannot use -z and -l");
1.21 ericj 371: if (!lflag && kflag)
1.32 ericj 372: errx(1, "must use -l with -k");
1.133 beck 373: if (uflag && usetls)
374: errx(1, "cannot use -c and -u");
375: if ((family == AF_UNIX) && usetls)
376: errx(1, "cannot use -c and -U");
1.140 beck 377: if ((family == AF_UNIX) && Fflag)
378: errx(1, "cannot use -F and -U");
379: if (Fflag && usetls)
380: errx(1, "cannot use -c and -F");
1.133 beck 381: if (TLSopt && !usetls)
382: errx(1, "you must specify -c to use TLS options");
383: if (Cflag && !usetls)
384: errx(1, "you must specify -c to use -C");
385: if (Kflag && !usetls)
386: errx(1, "you must specify -c to use -K");
1.168 beck 387: if (oflag && !Cflag)
388: errx(1, "you must specify -C to use -o");
1.133 beck 389: if (tls_cachanged && !usetls)
390: errx(1, "you must specify -c to use -R");
391: if (tls_expecthash && !usetls)
392: errx(1, "you must specify -c to use -H");
393: if (tls_expectname && !usetls)
394: errx(1, "you must specify -c to use -e");
1.21 ericj 395:
1.99 jeremy 396: /* Get name of temporary socket for unix datagram client */
397: if ((family == AF_UNIX) && uflag && !lflag) {
398: if (sflag) {
399: unix_dg_tmp_socket = sflag;
400: } else {
401: strlcpy(unix_dg_tmp_socket_buf, "/tmp/nc.XXXXXXXXXX",
1.136 deraadt 402: UNIX_DG_TMP_SOCKET_SIZE);
1.99 jeremy 403: if (mktemp(unix_dg_tmp_socket_buf) == NULL)
404: err(1, "mktemp");
405: unix_dg_tmp_socket = unix_dg_tmp_socket_buf;
406: }
407: }
408:
1.67 jmc 409: /* Initialize addrinfo structure. */
1.42 ericj 410: if (family != AF_UNIX) {
411: memset(&hints, 0, sizeof(struct addrinfo));
412: hints.ai_family = family;
413: hints.ai_socktype = uflag ? SOCK_DGRAM : SOCK_STREAM;
414: hints.ai_protocol = uflag ? IPPROTO_UDP : IPPROTO_TCP;
415: if (nflag)
416: hints.ai_flags |= AI_NUMERICHOST;
417: }
1.1 deraadt 418:
1.34 jakob 419: if (xflag) {
420: if (uflag)
421: errx(1, "no proxy support for UDP mode");
422:
423: if (lflag)
424: errx(1, "no proxy support for listen");
425:
1.42 ericj 426: if (family == AF_UNIX)
427: errx(1, "no proxy support for unix sockets");
428:
1.34 jakob 429: /* XXX IPv6 transport to proxy would probably work */
430: if (family == AF_INET6)
431: errx(1, "no proxy support for IPv6");
432:
433: if (sflag)
434: errx(1, "no proxy support for local source address");
435:
436: proxyhost = strsep(&proxy, ":");
437: proxyport = proxy;
438:
439: memset(&proxyhints, 0, sizeof(struct addrinfo));
440: proxyhints.ai_family = family;
441: proxyhints.ai_socktype = SOCK_STREAM;
442: proxyhints.ai_protocol = IPPROTO_TCP;
443: if (nflag)
444: proxyhints.ai_flags |= AI_NUMERICHOST;
445: }
446:
1.133 beck 447: if (usetls) {
1.152 beck 448: if (Pflag) {
1.162 jsing 449: if (pledge("stdio inet dns tty rpath", NULL) == -1)
1.152 beck 450: err(1, "pledge");
1.162 jsing 451: } else if (pledge("stdio inet dns rpath", NULL) == -1)
1.146 beck 452: err(1, "pledge");
453:
1.133 beck 454: if (tls_init() == -1)
455: errx(1, "unable to initialize TLS");
456: if ((tls_cfg = tls_config_new()) == NULL)
457: errx(1, "unable to allocate TLS config");
1.162 jsing 458: if (Rflag && tls_config_set_ca_file(tls_cfg, Rflag) == -1)
459: errx(1, "%s", tls_config_error(tls_cfg));
460: if (Cflag && tls_config_set_cert_file(tls_cfg, Cflag) == -1)
461: errx(1, "%s", tls_config_error(tls_cfg));
462: if (Kflag && tls_config_set_key_file(tls_cfg, Kflag) == -1)
1.168 beck 463: errx(1, "%s", tls_config_error(tls_cfg));
464: if (oflag && tls_config_set_ocsp_staple_file(tls_cfg, oflag) == -1)
1.162 jsing 465: errx(1, "%s", tls_config_error(tls_cfg));
1.170 beck 466: if (TLSopt & TLS_ALL) {
1.171 ! mestre 467: if (tls_config_set_protocols(tls_cfg,
! 468: TLS_PROTOCOLS_ALL) != 0)
! 469: errx(1, "%s", tls_config_error(tls_cfg));
! 470: if (tls_config_set_ciphers(tls_cfg, "all") != 0)
! 471: errx(1, "%s", tls_config_error(tls_cfg));
1.133 beck 472: }
473: if (!lflag && (TLSopt & TLS_CCERT))
474: errx(1, "clientcert is only valid with -l");
475: if (TLSopt & TLS_NONAME)
476: tls_config_insecure_noverifyname(tls_cfg);
477: if (TLSopt & TLS_NOVERIFY) {
478: if (tls_expecthash != NULL)
479: errx(1, "-H and -T noverify may not be used"
480: "together");
481: tls_config_insecure_noverifycert(tls_cfg);
482: }
1.167 beck 483: if (TLSopt & TLS_MUSTSTAPLE)
484: tls_config_ocsp_require_stapling(tls_cfg);
1.162 jsing 485:
486: if (Pflag) {
487: if (pledge("stdio inet dns tty", NULL) == -1)
488: err(1, "pledge");
489: } else if (pledge("stdio inet dns", NULL) == -1)
490: err(1, "pledge");
1.133 beck 491: }
1.21 ericj 492: if (lflag) {
1.133 beck 493: struct tls *tls_cctx = NULL;
1.21 ericj 494: int connfd;
1.27 ericj 495: ret = 0;
1.1 deraadt 496:
1.99 jeremy 497: if (family == AF_UNIX) {
498: if (uflag)
1.136 deraadt 499: s = unix_bind(host, 0);
1.99 jeremy 500: else
501: s = unix_listen(host);
502: }
1.42 ericj 503:
1.133 beck 504: if (usetls) {
505: tls_config_verify_client_optional(tls_cfg);
506: if ((tls_ctx = tls_server()) == NULL)
507: errx(1, "tls server creation failed");
508: if (tls_configure(tls_ctx, tls_cfg) == -1)
509: errx(1, "tls configuration failed (%s)",
510: tls_error(tls_ctx));
511: }
1.67 jmc 512: /* Allow only one connection at a time, but stay alive. */
1.21 ericj 513: for (;;) {
1.42 ericj 514: if (family != AF_UNIX)
515: s = local_listen(host, uport, hints);
516: if (s < 0)
1.30 smart 517: err(1, NULL);
1.21 ericj 518: /*
1.109 haesbaer 519: * For UDP and -k, don't connect the socket, let it
520: * receive datagrams from multiple socket pairs.
1.21 ericj 521: */
1.109 haesbaer 522: if (uflag && kflag)
1.133 beck 523: readwrite(s, NULL);
1.109 haesbaer 524: /*
525: * For UDP and not -k, we will use recvfrom() initially
526: * to wait for a caller, then use the regular functions
527: * to talk to the caller.
528: */
529: else if (uflag && !kflag) {
1.80 mcbride 530: int rv, plen;
1.97 nicm 531: char buf[16384];
1.21 ericj 532: struct sockaddr_storage z;
533:
534: len = sizeof(z);
1.106 dlg 535: plen = 2048;
1.80 mcbride 536: rv = recvfrom(s, buf, plen, MSG_PEEK,
1.37 jakob 537: (struct sockaddr *)&z, &len);
1.23 ericj 538: if (rv < 0)
1.57 stevesk 539: err(1, "recvfrom");
1.21 ericj 540:
1.37 jakob 541: rv = connect(s, (struct sockaddr *)&z, len);
1.23 ericj 542: if (rv < 0)
1.57 stevesk 543: err(1, "connect");
1.1 deraadt 544:
1.108 haesbaer 545: if (vflag)
1.151 beck 546: report_connect((struct sockaddr *)&z, len, NULL);
1.108 haesbaer 547:
1.133 beck 548: readwrite(s, NULL);
1.21 ericj 549: } else {
1.78 otto 550: len = sizeof(cliaddr);
1.132 bluhm 551: connfd = accept4(s, (struct sockaddr *)&cliaddr,
552: &len, SOCK_NONBLOCK);
1.110 deraadt 553: if (connfd == -1) {
554: /* For now, all errnos are fatal */
1.125 tedu 555: err(1, "accept");
1.110 deraadt 556: }
1.108 haesbaer 557: if (vflag)
1.151 beck 558: report_connect((struct sockaddr *)&cliaddr, len,
559: family == AF_UNIX ? host : NULL);
1.133 beck 560: if ((usetls) &&
1.134 deraadt 561: (tls_cctx = tls_setup_server(tls_ctx, connfd, host)))
1.133 beck 562: readwrite(connfd, tls_cctx);
563: if (!usetls)
564: readwrite(connfd, NULL);
565: if (tls_cctx) {
566: int i;
1.136 deraadt 567:
1.133 beck 568: do {
569: i = tls_close(tls_cctx);
570: } while (i == TLS_WANT_POLLIN ||
571: i == TLS_WANT_POLLOUT);
572: tls_free(tls_cctx);
573: tls_cctx = NULL;
574: }
1.99 jeremy 575: close(connfd);
1.21 ericj 576: }
1.42 ericj 577: if (family != AF_UNIX)
578: close(s);
1.99 jeremy 579: else if (uflag) {
580: if (connect(s, NULL, 0) < 0)
581: err(1, "connect");
582: }
1.27 ericj 583:
1.21 ericj 584: if (!kflag)
585: break;
1.11 ericj 586: }
1.42 ericj 587: } else if (family == AF_UNIX) {
588: ret = 0;
589:
590: if ((s = unix_connect(host)) > 0 && !zflag) {
1.133 beck 591: readwrite(s, NULL);
1.42 ericj 592: close(s);
593: } else
594: ret = 1;
595:
1.99 jeremy 596: if (uflag)
597: unlink(unix_dg_tmp_socket);
1.42 ericj 598: exit(ret);
599:
1.21 ericj 600: } else {
601: int i = 0;
1.6 deraadt 602:
1.67 jmc 603: /* Construct the portlist[] array. */
1.21 ericj 604: build_ports(uport);
1.1 deraadt 605:
1.67 jmc 606: /* Cycle through portlist, connecting to each port. */
1.154 deraadt 607: for (s = -1, i = 0; portlist[i] != NULL; i++) {
608: if (s != -1)
1.21 ericj 609: close(s);
1.34 jakob 610:
1.133 beck 611: if (usetls) {
612: if ((tls_ctx = tls_client()) == NULL)
613: errx(1, "tls client creation failed");
614: if (tls_configure(tls_ctx, tls_cfg) == -1)
615: errx(1, "tls configuration failed (%s)",
616: tls_error(tls_ctx));
617: }
1.34 jakob 618: if (xflag)
619: s = socks_connect(host, portlist[i], hints,
1.86 djm 620: proxyhost, proxyport, proxyhints, socksv,
621: Pflag);
1.34 jakob 622: else
623: s = remote_connect(host, portlist[i], hints);
624:
1.154 deraadt 625: if (s == -1)
1.21 ericj 626: continue;
1.1 deraadt 627:
1.21 ericj 628: ret = 0;
629: if (vflag || zflag) {
1.67 jmc 630: /* For UDP, make sure we are connected. */
1.21 ericj 631: if (uflag) {
1.50 vincent 632: if (udptest(s) == -1) {
1.21 ericj 633: ret = 1;
634: continue;
635: }
636: }
1.1 deraadt 637:
1.67 jmc 638: /* Don't look up port if -n. */
1.21 ericj 639: if (nflag)
640: sv = NULL;
641: else {
642: sv = getservbyport(
1.37 jakob 643: ntohs(atoi(portlist[i])),
644: uflag ? "udp" : "tcp");
1.21 ericj 645: }
1.50 vincent 646:
1.94 mpf 647: fprintf(stderr,
648: "Connection to %s %s port [%s/%s] "
649: "succeeded!\n", host, portlist[i],
650: uflag ? "udp" : "tcp",
1.37 jakob 651: sv ? sv->s_name : "*");
1.21 ericj 652: }
1.113 djm 653: if (Fflag)
654: fdpass(s);
1.133 beck 655: else {
656: if (usetls)
657: tls_setup_client(tls_ctx, s, host);
658: if (!zflag)
659: readwrite(s, tls_ctx);
660: if (tls_ctx) {
661: int j;
1.136 deraadt 662:
1.133 beck 663: do {
664: j = tls_close(tls_ctx);
665: } while (j == TLS_WANT_POLLIN ||
666: j == TLS_WANT_POLLOUT);
667: tls_free(tls_ctx);
668: tls_ctx = NULL;
669: }
670: }
1.7 deraadt 671: }
1.11 ericj 672: }
1.1 deraadt 673:
1.154 deraadt 674: if (s != -1)
1.21 ericj 675: close(s);
676:
1.133 beck 677: tls_config_free(tls_cfg);
678:
1.21 ericj 679: exit(ret);
1.7 deraadt 680: }
1.1 deraadt 681:
1.11 ericj 682: /*
1.99 jeremy 683: * unix_bind()
684: * Returns a unix socket bound to the given path
1.42 ericj 685: */
686: int
1.136 deraadt 687: unix_bind(char *path, int flags)
1.42 ericj 688: {
1.144 bcook 689: struct sockaddr_un s_un;
1.155 deraadt 690: int s, save_errno;
1.42 ericj 691:
1.99 jeremy 692: /* Create unix domain socket. */
1.136 deraadt 693: if ((s = socket(AF_UNIX, flags | (uflag ? SOCK_DGRAM : SOCK_STREAM),
694: 0)) < 0)
1.50 vincent 695: return (-1);
1.42 ericj 696:
1.144 bcook 697: memset(&s_un, 0, sizeof(struct sockaddr_un));
698: s_un.sun_family = AF_UNIX;
1.60 avsm 699:
1.144 bcook 700: if (strlcpy(s_un.sun_path, path, sizeof(s_un.sun_path)) >=
701: sizeof(s_un.sun_path)) {
1.60 avsm 702: close(s);
703: errno = ENAMETOOLONG;
704: return (-1);
705: }
1.99 jeremy 706:
1.144 bcook 707: if (bind(s, (struct sockaddr *)&s_un, sizeof(s_un)) < 0) {
1.155 deraadt 708: save_errno = errno;
1.50 vincent 709: close(s);
1.155 deraadt 710: errno = save_errno;
1.50 vincent 711: return (-1);
1.42 ericj 712: }
713: return (s);
714: }
715:
1.133 beck 716: void
717: tls_setup_client(struct tls *tls_ctx, int s, char *host)
718: {
719: int i;
1.136 deraadt 720:
1.133 beck 721: if (tls_connect_socket(tls_ctx, s,
722: tls_expectname ? tls_expectname : host) == -1) {
723: errx(1, "tls connection failed (%s)",
724: tls_error(tls_ctx));
725: }
726: do {
727: if ((i = tls_handshake(tls_ctx)) == -1)
728: errx(1, "tls handshake failed (%s)",
729: tls_error(tls_ctx));
730: } while (i == TLS_WANT_POLLIN || i == TLS_WANT_POLLOUT);
731: if (vflag)
732: report_tls(tls_ctx, host, tls_expectname);
1.137 beck 733: if (tls_expecthash && tls_peer_cert_hash(tls_ctx) &&
734: strcmp(tls_expecthash, tls_peer_cert_hash(tls_ctx)) != 0)
1.133 beck 735: errx(1, "peer certificate is not %s", tls_expecthash);
736: }
1.141 deraadt 737:
1.133 beck 738: struct tls *
739: tls_setup_server(struct tls *tls_ctx, int connfd, char *host)
740: {
741: struct tls *tls_cctx;
1.136 deraadt 742:
1.133 beck 743: if (tls_accept_socket(tls_ctx, &tls_cctx,
744: connfd) == -1) {
745: warnx("tls accept failed (%s)",
746: tls_error(tls_ctx));
747: tls_cctx = NULL;
748: } else {
749: int i;
1.136 deraadt 750:
1.133 beck 751: do {
752: if ((i = tls_handshake(tls_cctx)) == -1)
753: warnx("tls handshake failed (%s)",
754: tls_error(tls_cctx));
755: } while(i == TLS_WANT_POLLIN || i == TLS_WANT_POLLOUT);
756: }
757: if (tls_cctx) {
758: int gotcert = tls_peer_cert_provided(tls_cctx);
1.136 deraadt 759:
1.133 beck 760: if (vflag && gotcert)
761: report_tls(tls_cctx, host, tls_expectname);
762: if ((TLSopt & TLS_CCERT) && !gotcert)
763: warnx("No client certificate provided");
1.137 beck 764: else if (gotcert && tls_peer_cert_hash(tls_ctx) && tls_expecthash &&
765: strcmp(tls_expecthash, tls_peer_cert_hash(tls_ctx)) != 0)
1.133 beck 766: warnx("peer certificate is not %s", tls_expecthash);
767: else if (gotcert && tls_expectname &&
1.134 deraadt 768: (!tls_peer_cert_contains_name(tls_cctx, tls_expectname)))
1.133 beck 769: warnx("name (%s) not found in client cert",
770: tls_expectname);
771: else {
772: return tls_cctx;
773: }
774: }
775: return NULL;
776: }
1.141 deraadt 777:
1.42 ericj 778: /*
1.99 jeremy 779: * unix_connect()
780: * Returns a socket connected to a local unix socket. Returns -1 on failure.
1.42 ericj 781: */
782: int
1.99 jeremy 783: unix_connect(char *path)
1.42 ericj 784: {
1.144 bcook 785: struct sockaddr_un s_un;
1.155 deraadt 786: int s, save_errno;
1.42 ericj 787:
1.99 jeremy 788: if (uflag) {
1.136 deraadt 789: if ((s = unix_bind(unix_dg_tmp_socket, SOCK_CLOEXEC)) < 0)
1.99 jeremy 790: return (-1);
791: } else {
1.136 deraadt 792: if ((s = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0)) < 0)
1.99 jeremy 793: return (-1);
794: }
1.42 ericj 795:
1.144 bcook 796: memset(&s_un, 0, sizeof(struct sockaddr_un));
797: s_un.sun_family = AF_UNIX;
1.60 avsm 798:
1.144 bcook 799: if (strlcpy(s_un.sun_path, path, sizeof(s_un.sun_path)) >=
800: sizeof(s_un.sun_path)) {
1.60 avsm 801: close(s);
802: errno = ENAMETOOLONG;
803: return (-1);
804: }
1.144 bcook 805: if (connect(s, (struct sockaddr *)&s_un, sizeof(s_un)) < 0) {
1.155 deraadt 806: save_errno = errno;
1.42 ericj 807: close(s);
1.155 deraadt 808: errno = save_errno;
1.42 ericj 809: return (-1);
810: }
1.99 jeremy 811: return (s);
812:
813: }
814:
815: /*
816: * unix_listen()
817: * Create a unix domain socket, and listen on it.
818: */
819: int
820: unix_listen(char *path)
821: {
822: int s;
1.136 deraadt 823: if ((s = unix_bind(path, 0)) < 0)
1.99 jeremy 824: return (-1);
1.42 ericj 825:
826: if (listen(s, 5) < 0) {
827: close(s);
828: return (-1);
829: }
830: return (s);
831: }
832:
833: /*
1.21 ericj 834: * remote_connect()
1.67 jmc 835: * Returns a socket connected to a remote host. Properly binds to a local
836: * port or source address if needed. Returns -1 on failure.
1.11 ericj 837: */
1.21 ericj 838: int
1.77 otto 839: remote_connect(const char *host, const char *port, struct addrinfo hints)
1.21 ericj 840: {
841: struct addrinfo *res, *res0;
1.163 bcook 842: int s = -1, error, on = 1, save_errno;
1.21 ericj 843:
1.161 halex 844: if ((error = getaddrinfo(host, port, &hints, &res0)))
1.56 stevesk 845: errx(1, "getaddrinfo: %s", gai_strerror(error));
1.21 ericj 846:
1.161 halex 847: for (res = res0; res; res = res->ai_next) {
848: if ((s = socket(res->ai_family, res->ai_socktype |
849: SOCK_NONBLOCK, res->ai_protocol)) < 0)
1.21 ericj 850: continue;
851:
1.67 jmc 852: /* Bind to a local port or source address if specified. */
1.21 ericj 853: if (sflag || pflag) {
854: struct addrinfo ahints, *ares;
1.6 deraadt 855:
1.91 markus 856: /* try SO_BINDANY, but don't insist */
857: setsockopt(s, SOL_SOCKET, SO_BINDANY, &on, sizeof(on));
1.21 ericj 858: memset(&ahints, 0, sizeof(struct addrinfo));
1.161 halex 859: ahints.ai_family = res->ai_family;
1.21 ericj 860: ahints.ai_socktype = uflag ? SOCK_DGRAM : SOCK_STREAM;
861: ahints.ai_protocol = uflag ? IPPROTO_UDP : IPPROTO_TCP;
1.25 ericj 862: ahints.ai_flags = AI_PASSIVE;
1.38 jakob 863: if ((error = getaddrinfo(sflag, pflag, &ahints, &ares)))
1.56 stevesk 864: errx(1, "getaddrinfo: %s", gai_strerror(error));
1.21 ericj 865:
866: if (bind(s, (struct sockaddr *)ares->ai_addr,
1.62 millert 867: ares->ai_addrlen) < 0)
1.119 guenther 868: err(1, "bind failed");
1.21 ericj 869: freeaddrinfo(ares);
1.6 deraadt 870: }
1.81 marius 871:
1.161 halex 872: set_common_sockopts(s, res->ai_family);
1.6 deraadt 873:
1.161 halex 874: if (timeout_connect(s, res->ai_addr, res->ai_addrlen) == 0)
1.6 deraadt 875: break;
1.143 deraadt 876: if (vflag)
1.71 mcbride 877: warn("connect to %s port %s (%s) failed", host, port,
878: uflag ? "udp" : "tcp");
1.34 jakob 879:
1.155 deraadt 880: save_errno = errno;
1.21 ericj 881: close(s);
1.155 deraadt 882: errno = save_errno;
1.21 ericj 883: s = -1;
1.161 halex 884: }
1.21 ericj 885:
1.161 halex 886: freeaddrinfo(res0);
1.1 deraadt 887:
1.21 ericj 888: return (s);
1.103 fgsch 889: }
890:
891: int
892: timeout_connect(int s, const struct sockaddr *name, socklen_t namelen)
893: {
894: struct pollfd pfd;
895: socklen_t optlen;
1.132 bluhm 896: int optval;
1.103 fgsch 897: int ret;
898:
899: if ((ret = connect(s, name, namelen)) != 0 && errno == EINPROGRESS) {
900: pfd.fd = s;
901: pfd.events = POLLOUT;
902: if ((ret = poll(&pfd, 1, timeout)) == 1) {
903: optlen = sizeof(optval);
904: if ((ret = getsockopt(s, SOL_SOCKET, SO_ERROR,
905: &optval, &optlen)) == 0) {
906: errno = optval;
907: ret = optval == 0 ? 0 : -1;
908: }
909: } else if (ret == 0) {
910: errno = ETIMEDOUT;
911: ret = -1;
912: } else
913: err(1, "poll failed");
914: }
915:
916: return (ret);
1.7 deraadt 917: }
1.1 deraadt 918:
1.11 ericj 919: /*
1.21 ericj 920: * local_listen()
1.67 jmc 921: * Returns a socket listening on a local port, binds to specified source
922: * address. Returns -1 on failure.
1.11 ericj 923: */
1.21 ericj 924: int
1.37 jakob 925: local_listen(char *host, char *port, struct addrinfo hints)
1.21 ericj 926: {
927: struct addrinfo *res, *res0;
1.163 bcook 928: int s = -1, ret, x = 1, save_errno;
1.21 ericj 929: int error;
1.6 deraadt 930:
1.67 jmc 931: /* Allow nodename to be null. */
1.21 ericj 932: hints.ai_flags |= AI_PASSIVE;
1.7 deraadt 933:
1.21 ericj 934: /*
935: * In the case of binding to a wildcard address
936: * default to binding to an ipv4 address.
937: */
938: if (host == NULL && hints.ai_family == AF_UNSPEC)
939: hints.ai_family = AF_INET;
1.1 deraadt 940:
1.161 halex 941: if ((error = getaddrinfo(host, port, &hints, &res0)))
1.70 deraadt 942: errx(1, "getaddrinfo: %s", gai_strerror(error));
1.14 ericj 943:
1.161 halex 944: for (res = res0; res; res = res->ai_next) {
945: if ((s = socket(res->ai_family, res->ai_socktype,
946: res->ai_protocol)) < 0)
1.21 ericj 947: continue;
1.93 claudio 948:
1.21 ericj 949: ret = setsockopt(s, SOL_SOCKET, SO_REUSEPORT, &x, sizeof(x));
950: if (ret == -1)
1.30 smart 951: err(1, NULL);
1.81 marius 952:
1.161 halex 953: set_common_sockopts(s, res->ai_family);
1.1 deraadt 954:
1.161 halex 955: if (bind(s, (struct sockaddr *)res->ai_addr,
956: res->ai_addrlen) == 0)
1.21 ericj 957: break;
1.1 deraadt 958:
1.155 deraadt 959: save_errno = errno;
1.21 ericj 960: close(s);
1.155 deraadt 961: errno = save_errno;
1.21 ericj 962: s = -1;
1.161 halex 963: }
1.1 deraadt 964:
1.47 ericj 965: if (!uflag && s != -1) {
1.21 ericj 966: if (listen(s, 1) < 0)
1.57 stevesk 967: err(1, "listen");
1.12 ericj 968: }
1.1 deraadt 969:
1.161 halex 970: freeaddrinfo(res0);
1.1 deraadt 971:
1.21 ericj 972: return (s);
1.7 deraadt 973: }
974:
1.11 ericj 975: /*
1.21 ericj 976: * readwrite()
977: * Loop that polls on the network file descriptor and stdin.
1.11 ericj 978: */
1.21 ericj 979: void
1.133 beck 980: readwrite(int net_fd, struct tls *tls_ctx)
1.6 deraadt 981: {
1.125 tedu 982: struct pollfd pfd[4];
983: int stdin_fd = STDIN_FILENO;
984: int stdout_fd = STDOUT_FILENO;
985: unsigned char netinbuf[BUFSIZE];
986: size_t netinbufpos = 0;
987: unsigned char stdinbuf[BUFSIZE];
988: size_t stdinbufpos = 0;
1.130 chl 989: int n, num_fds;
1.125 tedu 990: ssize_t ret;
991:
992: /* don't read from stdin if requested */
993: if (dflag)
994: stdin_fd = -1;
995:
996: /* stdin */
997: pfd[POLL_STDIN].fd = stdin_fd;
998: pfd[POLL_STDIN].events = POLLIN;
999:
1000: /* network out */
1001: pfd[POLL_NETOUT].fd = net_fd;
1002: pfd[POLL_NETOUT].events = 0;
1003:
1004: /* network in */
1005: pfd[POLL_NETIN].fd = net_fd;
1006: pfd[POLL_NETIN].events = POLLIN;
1007:
1008: /* stdout */
1009: pfd[POLL_STDOUT].fd = stdout_fd;
1010: pfd[POLL_STDOUT].events = 0;
1011:
1012: while (1) {
1013: /* both inputs are gone, buffers are empty, we are done */
1.134 deraadt 1014: if (pfd[POLL_STDIN].fd == -1 && pfd[POLL_NETIN].fd == -1 &&
1015: stdinbufpos == 0 && netinbufpos == 0) {
1.125 tedu 1016: close(net_fd);
1017: return;
1018: }
1019: /* both outputs are gone, we can't continue */
1020: if (pfd[POLL_NETOUT].fd == -1 && pfd[POLL_STDOUT].fd == -1) {
1021: close(net_fd);
1022: return;
1023: }
1024: /* listen and net in gone, queues empty, done */
1.134 deraadt 1025: if (lflag && pfd[POLL_NETIN].fd == -1 &&
1026: stdinbufpos == 0 && netinbufpos == 0) {
1.125 tedu 1027: close(net_fd);
1028: return;
1029: }
1.21 ericj 1030:
1.125 tedu 1031: /* help says -i is for "wait between lines sent". We read and
1032: * write arbitrary amounts of data, and we don't want to start
1033: * scanning for newlines, so this is as good as it gets */
1.21 ericj 1034: if (iflag)
1035: sleep(iflag);
1036:
1.125 tedu 1037: /* poll */
1038: num_fds = poll(pfd, 4, timeout);
1039:
1040: /* treat poll errors */
1041: if (num_fds == -1) {
1042: close(net_fd);
1043: err(1, "polling error");
1.21 ericj 1044: }
1.49 hugh 1045:
1.125 tedu 1046: /* timeout happened */
1047: if (num_fds == 0)
1.49 hugh 1048: return;
1.21 ericj 1049:
1.125 tedu 1050: /* treat socket error conditions */
1051: for (n = 0; n < 4; n++) {
1052: if (pfd[n].revents & (POLLERR|POLLNVAL)) {
1053: pfd[n].fd = -1;
1.6 deraadt 1054: }
1.21 ericj 1055: }
1.125 tedu 1056: /* reading is possible after HUP */
1057: if (pfd[POLL_STDIN].events & POLLIN &&
1058: pfd[POLL_STDIN].revents & POLLHUP &&
1.134 deraadt 1059: !(pfd[POLL_STDIN].revents & POLLIN))
1060: pfd[POLL_STDIN].fd = -1;
1.125 tedu 1061:
1062: if (pfd[POLL_NETIN].events & POLLIN &&
1063: pfd[POLL_NETIN].revents & POLLHUP &&
1.134 deraadt 1064: !(pfd[POLL_NETIN].revents & POLLIN))
1065: pfd[POLL_NETIN].fd = -1;
1.125 tedu 1066:
1067: if (pfd[POLL_NETOUT].revents & POLLHUP) {
1068: if (Nflag)
1069: shutdown(pfd[POLL_NETOUT].fd, SHUT_WR);
1070: pfd[POLL_NETOUT].fd = -1;
1071: }
1072: /* if HUP, stop watching stdout */
1073: if (pfd[POLL_STDOUT].revents & POLLHUP)
1074: pfd[POLL_STDOUT].fd = -1;
1075: /* if no net out, stop watching stdin */
1076: if (pfd[POLL_NETOUT].fd == -1)
1077: pfd[POLL_STDIN].fd = -1;
1078: /* if no stdout, stop watching net in */
1079: if (pfd[POLL_STDOUT].fd == -1) {
1080: if (pfd[POLL_NETIN].fd != -1)
1081: shutdown(pfd[POLL_NETIN].fd, SHUT_RD);
1082: pfd[POLL_NETIN].fd = -1;
1083: }
1.21 ericj 1084:
1.125 tedu 1085: /* try to read from stdin */
1086: if (pfd[POLL_STDIN].revents & POLLIN && stdinbufpos < BUFSIZE) {
1087: ret = fillbuf(pfd[POLL_STDIN].fd, stdinbuf,
1.133 beck 1088: &stdinbufpos, NULL);
1089: if (ret == TLS_WANT_POLLIN)
1090: pfd[POLL_STDIN].events = POLLIN;
1091: else if (ret == TLS_WANT_POLLOUT)
1092: pfd[POLL_STDIN].events = POLLOUT;
1093: else if (ret == 0 || ret == -1)
1.125 tedu 1094: pfd[POLL_STDIN].fd = -1;
1095: /* read something - poll net out */
1096: if (stdinbufpos > 0)
1097: pfd[POLL_NETOUT].events = POLLOUT;
1098: /* filled buffer - remove self from polling */
1099: if (stdinbufpos == BUFSIZE)
1100: pfd[POLL_STDIN].events = 0;
1101: }
1102: /* try to write to network */
1103: if (pfd[POLL_NETOUT].revents & POLLOUT && stdinbufpos > 0) {
1104: ret = drainbuf(pfd[POLL_NETOUT].fd, stdinbuf,
1.133 beck 1105: &stdinbufpos, tls_ctx);
1106: if (ret == TLS_WANT_POLLIN)
1107: pfd[POLL_NETOUT].events = POLLIN;
1108: else if (ret == TLS_WANT_POLLOUT)
1109: pfd[POLL_NETOUT].events = POLLOUT;
1110: else if (ret == -1)
1.125 tedu 1111: pfd[POLL_NETOUT].fd = -1;
1112: /* buffer empty - remove self from polling */
1113: if (stdinbufpos == 0)
1114: pfd[POLL_NETOUT].events = 0;
1115: /* buffer no longer full - poll stdin again */
1116: if (stdinbufpos < BUFSIZE)
1117: pfd[POLL_STDIN].events = POLLIN;
1118: }
1119: /* try to read from network */
1120: if (pfd[POLL_NETIN].revents & POLLIN && netinbufpos < BUFSIZE) {
1121: ret = fillbuf(pfd[POLL_NETIN].fd, netinbuf,
1.133 beck 1122: &netinbufpos, tls_ctx);
1123: if (ret == TLS_WANT_POLLIN)
1124: pfd[POLL_NETIN].events = POLLIN;
1125: else if (ret == TLS_WANT_POLLOUT)
1126: pfd[POLL_NETIN].events = POLLOUT;
1127: else if (ret == -1)
1.125 tedu 1128: pfd[POLL_NETIN].fd = -1;
1129: /* eof on net in - remove from pfd */
1130: if (ret == 0) {
1131: shutdown(pfd[POLL_NETIN].fd, SHUT_RD);
1132: pfd[POLL_NETIN].fd = -1;
1.50 vincent 1133: }
1.125 tedu 1134: /* read something - poll stdout */
1135: if (netinbufpos > 0)
1136: pfd[POLL_STDOUT].events = POLLOUT;
1137: /* filled buffer - remove self from polling */
1138: if (netinbufpos == BUFSIZE)
1139: pfd[POLL_NETIN].events = 0;
1140: /* handle telnet */
1141: if (tflag)
1142: atelnet(pfd[POLL_NETIN].fd, netinbuf,
1143: netinbufpos);
1144: }
1145: /* try to write to stdout */
1146: if (pfd[POLL_STDOUT].revents & POLLOUT && netinbufpos > 0) {
1147: ret = drainbuf(pfd[POLL_STDOUT].fd, netinbuf,
1.133 beck 1148: &netinbufpos, NULL);
1149: if (ret == TLS_WANT_POLLIN)
1150: pfd[POLL_STDOUT].events = POLLIN;
1151: else if (ret == TLS_WANT_POLLOUT)
1152: pfd[POLL_STDOUT].events = POLLOUT;
1153: else if (ret == -1)
1.125 tedu 1154: pfd[POLL_STDOUT].fd = -1;
1155: /* buffer empty - remove self from polling */
1156: if (netinbufpos == 0)
1157: pfd[POLL_STDOUT].events = 0;
1158: /* buffer no longer full - poll net in again */
1159: if (netinbufpos < BUFSIZE)
1160: pfd[POLL_NETIN].events = POLLIN;
1161: }
1162:
1163: /* stdin gone and queue empty? */
1164: if (pfd[POLL_STDIN].fd == -1 && stdinbufpos == 0) {
1165: if (pfd[POLL_NETOUT].fd != -1 && Nflag)
1166: shutdown(pfd[POLL_NETOUT].fd, SHUT_WR);
1167: pfd[POLL_NETOUT].fd = -1;
1168: }
1169: /* net in gone and queue empty? */
1170: if (pfd[POLL_NETIN].fd == -1 && netinbufpos == 0) {
1171: pfd[POLL_STDOUT].fd = -1;
1.21 ericj 1172: }
1.11 ericj 1173: }
1.125 tedu 1174: }
1175:
1176: ssize_t
1.133 beck 1177: drainbuf(int fd, unsigned char *buf, size_t *bufpos, struct tls *tls)
1.125 tedu 1178: {
1179: ssize_t n;
1180: ssize_t adjust;
1181:
1.133 beck 1182: if (tls)
1183: n = tls_write(tls, buf, *bufpos);
1184: else {
1185: n = write(fd, buf, *bufpos);
1186: /* don't treat EAGAIN, EINTR as error */
1187: if (n == -1 && (errno == EAGAIN || errno == EINTR))
1188: n = TLS_WANT_POLLOUT;
1189: }
1.125 tedu 1190: if (n <= 0)
1191: return n;
1192: /* adjust buffer */
1193: adjust = *bufpos - n;
1194: if (adjust > 0)
1195: memmove(buf, buf + n, adjust);
1196: *bufpos -= n;
1197: return n;
1198: }
1199:
1200: ssize_t
1.133 beck 1201: fillbuf(int fd, unsigned char *buf, size_t *bufpos, struct tls *tls)
1.125 tedu 1202: {
1203: size_t num = BUFSIZE - *bufpos;
1204: ssize_t n;
1205:
1.133 beck 1206: if (tls)
1207: n = tls_read(tls, buf + *bufpos, num);
1208: else {
1209: n = read(fd, buf + *bufpos, num);
1210: /* don't treat EAGAIN, EINTR as error */
1211: if (n == -1 && (errno == EAGAIN || errno == EINTR))
1212: n = TLS_WANT_POLLIN;
1213: }
1.125 tedu 1214: if (n <= 0)
1215: return n;
1216: *bufpos += n;
1217: return n;
1.113 djm 1218: }
1219:
1220: /*
1221: * fdpass()
1222: * Pass the connected file descriptor to stdout and exit.
1223: */
1224: void
1225: fdpass(int nfd)
1226: {
1227: struct msghdr mh;
1228: union {
1229: struct cmsghdr hdr;
1230: char buf[CMSG_SPACE(sizeof(int))];
1231: } cmsgbuf;
1232: struct cmsghdr *cmsg;
1233: struct iovec iov;
1234: char c = '\0';
1235: ssize_t r;
1236: struct pollfd pfd;
1237:
1238: /* Avoid obvious stupidity */
1239: if (isatty(STDOUT_FILENO))
1240: errx(1, "Cannot pass file descriptor to tty");
1241:
1242: bzero(&mh, sizeof(mh));
1243: bzero(&cmsgbuf, sizeof(cmsgbuf));
1244: bzero(&iov, sizeof(iov));
1245:
1246: mh.msg_control = (caddr_t)&cmsgbuf.buf;
1247: mh.msg_controllen = sizeof(cmsgbuf.buf);
1248: cmsg = CMSG_FIRSTHDR(&mh);
1249: cmsg->cmsg_len = CMSG_LEN(sizeof(int));
1250: cmsg->cmsg_level = SOL_SOCKET;
1251: cmsg->cmsg_type = SCM_RIGHTS;
1252: *(int *)CMSG_DATA(cmsg) = nfd;
1253:
1254: iov.iov_base = &c;
1255: iov.iov_len = 1;
1256: mh.msg_iov = &iov;
1257: mh.msg_iovlen = 1;
1258:
1259: bzero(&pfd, sizeof(pfd));
1260: pfd.fd = STDOUT_FILENO;
1.128 tobias 1261: pfd.events = POLLOUT;
1.113 djm 1262: for (;;) {
1263: r = sendmsg(STDOUT_FILENO, &mh, 0);
1264: if (r == -1) {
1265: if (errno == EAGAIN || errno == EINTR) {
1266: if (poll(&pfd, 1, -1) == -1)
1267: err(1, "poll");
1268: continue;
1269: }
1270: err(1, "sendmsg");
1.128 tobias 1271: } else if (r != 1)
1.113 djm 1272: errx(1, "sendmsg: unexpected return value %zd", r);
1273: else
1274: break;
1275: }
1276: exit(0);
1.7 deraadt 1277: }
1.50 vincent 1278:
1.67 jmc 1279: /* Deal with RFC 854 WILL/WONT DO/DONT negotiation. */
1.21 ericj 1280: void
1.37 jakob 1281: atelnet(int nfd, unsigned char *buf, unsigned int size)
1.6 deraadt 1282: {
1.24 ericj 1283: unsigned char *p, *end;
1284: unsigned char obuf[4];
1285:
1.95 nicm 1286: if (size < 3)
1287: return;
1288: end = buf + size - 2;
1.24 ericj 1289:
1290: for (p = buf; p < end; p++) {
1.21 ericj 1291: if (*p != IAC)
1.95 nicm 1292: continue;
1.24 ericj 1293:
1.25 ericj 1294: obuf[0] = IAC;
1.24 ericj 1295: p++;
1.50 vincent 1296: if ((*p == WILL) || (*p == WONT))
1.24 ericj 1297: obuf[1] = DONT;
1.95 nicm 1298: else if ((*p == DO) || (*p == DONT))
1.24 ericj 1299: obuf[1] = WONT;
1.95 nicm 1300: else
1301: continue;
1302:
1303: p++;
1304: obuf[2] = *p;
1305: if (atomicio(vwrite, nfd, obuf, 3) != 3)
1306: warn("Write Error!");
1.11 ericj 1307: }
1.7 deraadt 1308: }
1309:
1.153 beck 1310:
1311: int
1312: strtoport(char *portstr, int udp)
1313: {
1314: struct servent *entry;
1315: const char *errstr;
1316: char *proto;
1317: int port = -1;
1318:
1319: proto = udp ? "udp" : "tcp";
1320:
1321: port = strtonum(portstr, 1, PORT_MAX, &errstr);
1322: if (errstr == NULL)
1323: return port;
1324: if (errno != EINVAL)
1325: errx(1, "port number %s: %s", errstr, portstr);
1326: if ((entry = getservbyname(portstr, proto)) == NULL)
1327: errx(1, "service \"%s\" unknown", portstr);
1328: return ntohs(entry->s_port);
1329: }
1330:
1.11 ericj 1331: /*
1.21 ericj 1332: * build_ports()
1.105 lum 1333: * Build an array of ports in portlist[], listing each port
1.67 jmc 1334: * that we should try to connect to.
1.11 ericj 1335: */
1.21 ericj 1336: void
1.37 jakob 1337: build_ports(char *p)
1.6 deraadt 1338: {
1.88 ray 1339: char *n;
1.21 ericj 1340: int hi, lo, cp;
1341: int x = 0;
1342:
1343: if ((n = strchr(p, '-')) != NULL) {
1344: *n = '\0';
1345: n++;
1346:
1.67 jmc 1347: /* Make sure the ports are in order: lowest->highest. */
1.153 beck 1348: hi = strtoport(n, uflag);
1349: lo = strtoport(p, uflag);
1.21 ericj 1350: if (lo > hi) {
1351: cp = hi;
1352: hi = lo;
1353: lo = cp;
1354: }
1355:
1.145 tb 1356: /*
1357: * Initialize portlist with a random permutation. Based on
1358: * Knuth, as in ip_randomid() in sys/netinet/ip_id.c.
1359: */
1.21 ericj 1360: if (rflag) {
1.145 tb 1361: for (x = 0; x <= hi - lo; x++) {
1362: cp = arc4random_uniform(x + 1);
1363: portlist[x] = portlist[cp];
1364: if (asprintf(&portlist[cp], "%d", x + lo) < 0)
1365: err(1, "asprintf");
1366: }
1367: } else { /* Load ports sequentially. */
1368: for (cp = lo; cp <= hi; cp++) {
1369: if (asprintf(&portlist[x], "%d", cp) < 0)
1370: err(1, "asprintf");
1371: x++;
1.6 deraadt 1372: }
1.11 ericj 1373: }
1.21 ericj 1374: } else {
1.153 beck 1375: char *tmp;
1376:
1377: hi = strtoport(p, uflag);
1378: if (asprintf(&tmp, "%d", hi) != -1)
1379: portlist[0] = tmp;
1380: else
1.55 fgsch 1381: err(1, NULL);
1.11 ericj 1382: }
1.13 ericj 1383: }
1384:
1385: /*
1.21 ericj 1386: * udptest()
1387: * Do a few writes to see if the UDP port is there.
1.105 lum 1388: * Fails once PF state table is full.
1.13 ericj 1389: */
1.21 ericj 1390: int
1.37 jakob 1391: udptest(int s)
1.13 ericj 1392: {
1.74 deraadt 1393: int i, ret;
1.13 ericj 1394:
1.52 vincent 1395: for (i = 0; i <= 3; i++) {
1.74 deraadt 1396: if (write(s, "X", 1) == 1)
1.21 ericj 1397: ret = 1;
1.14 ericj 1398: else
1.21 ericj 1399: ret = -1;
1.14 ericj 1400: }
1.21 ericj 1401: return (ret);
1.81 marius 1402: }
1403:
1.84 dtucker 1404: void
1.127 jca 1405: set_common_sockopts(int s, int af)
1.81 marius 1406: {
1407: int x = 1;
1408:
1409: if (Sflag) {
1410: if (setsockopt(s, IPPROTO_TCP, TCP_MD5SIG,
1411: &x, sizeof(x)) == -1)
1412: err(1, NULL);
1413: }
1414: if (Dflag) {
1415: if (setsockopt(s, SOL_SOCKET, SO_DEBUG,
1416: &x, sizeof(x)) == -1)
1417: err(1, NULL);
1418: }
1.83 dtucker 1419: if (Tflag != -1) {
1.157 bcook 1420: if (af == AF_INET && setsockopt(s, IPPROTO_IP,
1421: IP_TOS, &Tflag, sizeof(Tflag)) == -1)
1422: err(1, "set IP ToS");
1.127 jca 1423:
1.157 bcook 1424: else if (af == AF_INET6 && setsockopt(s, IPPROTO_IPV6,
1425: IPV6_TCLASS, &Tflag, sizeof(Tflag)) == -1)
1426: err(1, "set IPv6 traffic class");
1.83 dtucker 1427: }
1.90 djm 1428: if (Iflag) {
1429: if (setsockopt(s, SOL_SOCKET, SO_RCVBUF,
1430: &Iflag, sizeof(Iflag)) == -1)
1431: err(1, "set TCP receive buffer size");
1432: }
1433: if (Oflag) {
1434: if (setsockopt(s, SOL_SOCKET, SO_SNDBUF,
1435: &Oflag, sizeof(Oflag)) == -1)
1436: err(1, "set TCP send buffer size");
1437: }
1.157 bcook 1438:
1439: if (ttl != -1) {
1440: if (af == AF_INET && setsockopt(s, IPPROTO_IP,
1441: IP_TTL, &ttl, sizeof(ttl)))
1442: err(1, "set IP TTL");
1443:
1444: else if (af == AF_INET6 && setsockopt(s, IPPROTO_IPV6,
1445: IPV6_UNICAST_HOPS, &ttl, sizeof(ttl)))
1446: err(1, "set IPv6 unicast hops");
1447: }
1448:
1449: if (minttl != -1) {
1450: if (af == AF_INET && setsockopt(s, IPPROTO_IP,
1451: IP_MINTTL, &minttl, sizeof(minttl)))
1452: err(1, "set IP min TTL");
1453:
1454: else if (af == AF_INET6 && setsockopt(s, IPPROTO_IPV6,
1455: IPV6_MINHOPCOUNT, &minttl, sizeof(minttl)))
1456: err(1, "set IPv6 min hop count");
1.156 jca 1457: }
1.83 dtucker 1458: }
1459:
1460: int
1.102 haesbaer 1461: map_tos(char *s, int *val)
1.83 dtucker 1462: {
1.102 haesbaer 1463: /* DiffServ Codepoints and other TOS mappings */
1464: const struct toskeywords {
1465: const char *keyword;
1466: int val;
1467: } *t, toskeywords[] = {
1468: { "af11", IPTOS_DSCP_AF11 },
1469: { "af12", IPTOS_DSCP_AF12 },
1470: { "af13", IPTOS_DSCP_AF13 },
1471: { "af21", IPTOS_DSCP_AF21 },
1472: { "af22", IPTOS_DSCP_AF22 },
1473: { "af23", IPTOS_DSCP_AF23 },
1474: { "af31", IPTOS_DSCP_AF31 },
1475: { "af32", IPTOS_DSCP_AF32 },
1476: { "af33", IPTOS_DSCP_AF33 },
1477: { "af41", IPTOS_DSCP_AF41 },
1478: { "af42", IPTOS_DSCP_AF42 },
1479: { "af43", IPTOS_DSCP_AF43 },
1480: { "critical", IPTOS_PREC_CRITIC_ECP },
1481: { "cs0", IPTOS_DSCP_CS0 },
1482: { "cs1", IPTOS_DSCP_CS1 },
1483: { "cs2", IPTOS_DSCP_CS2 },
1484: { "cs3", IPTOS_DSCP_CS3 },
1485: { "cs4", IPTOS_DSCP_CS4 },
1486: { "cs5", IPTOS_DSCP_CS5 },
1487: { "cs6", IPTOS_DSCP_CS6 },
1488: { "cs7", IPTOS_DSCP_CS7 },
1489: { "ef", IPTOS_DSCP_EF },
1490: { "inetcontrol", IPTOS_PREC_INTERNETCONTROL },
1491: { "lowdelay", IPTOS_LOWDELAY },
1492: { "netcontrol", IPTOS_PREC_NETCONTROL },
1493: { "reliability", IPTOS_RELIABILITY },
1494: { "throughput", IPTOS_THROUGHPUT },
1.134 deraadt 1495: { NULL, -1 },
1.102 haesbaer 1496: };
1497:
1498: for (t = toskeywords; t->keyword != NULL; t++) {
1499: if (strcmp(s, t->keyword) == 0) {
1500: *val = t->val;
1501: return (1);
1502: }
1503: }
1.83 dtucker 1504:
1.102 haesbaer 1505: return (0);
1.108 haesbaer 1506: }
1507:
1.133 beck 1508: int
1509: map_tls(char *s, int *val)
1510: {
1511: const struct tlskeywords {
1512: const char *keyword;
1513: int val;
1514: } *t, tlskeywords[] = {
1.170 beck 1515: { "tlsall", TLS_ALL },
1.133 beck 1516: { "noverify", TLS_NOVERIFY },
1517: { "noname", TLS_NONAME },
1518: { "clientcert", TLS_CCERT},
1.167 beck 1519: { "muststaple", TLS_MUSTSTAPLE},
1.134 deraadt 1520: { NULL, -1 },
1.133 beck 1521: };
1522:
1523: for (t = tlskeywords; t->keyword != NULL; t++) {
1524: if (strcmp(s, t->keyword) == 0) {
1525: *val |= t->val;
1526: return (1);
1527: }
1528: }
1529: return (0);
1530: }
1531:
1532: void
1533: report_tls(struct tls * tls_ctx, char * host, char *tls_expectname)
1534: {
1.147 beck 1535: time_t t;
1.164 beck 1536: const char *ocsp_url;
1537:
1.138 beck 1538: fprintf(stderr, "TLS handshake negotiated %s/%s with host %s\n",
1539: tls_conn_version(tls_ctx), tls_conn_cipher(tls_ctx), host);
1.148 mmcc 1540: fprintf(stderr, "Peer name: %s\n",
1.133 beck 1541: tls_expectname ? tls_expectname : host);
1.137 beck 1542: if (tls_peer_cert_subject(tls_ctx))
1543: fprintf(stderr, "Subject: %s\n",
1544: tls_peer_cert_subject(tls_ctx));
1545: if (tls_peer_cert_issuer(tls_ctx))
1546: fprintf(stderr, "Issuer: %s\n",
1547: tls_peer_cert_issuer(tls_ctx));
1.147 beck 1548: if ((t = tls_peer_cert_notbefore(tls_ctx)) != -1)
1549: fprintf(stderr, "Valid From: %s", ctime(&t));
1550: if ((t = tls_peer_cert_notafter(tls_ctx)) != -1)
1551: fprintf(stderr, "Valid Until: %s", ctime(&t));
1.137 beck 1552: if (tls_peer_cert_hash(tls_ctx))
1553: fprintf(stderr, "Cert Hash: %s\n",
1554: tls_peer_cert_hash(tls_ctx));
1.164 beck 1555: ocsp_url = tls_peer_ocsp_url(tls_ctx);
1.166 beck 1556: if (ocsp_url != NULL)
1557: fprintf(stderr, "OCSP URL: %s\n", ocsp_url);
1.164 beck 1558: switch (tls_peer_ocsp_response_status(tls_ctx)) {
1559: case TLS_OCSP_RESPONSE_SUCCESSFUL:
1.165 beck 1560: fprintf(stderr, "OCSP Stapling: %s\n",
1.164 beck 1561: tls_peer_ocsp_result(tls_ctx) == NULL ? "" :
1562: tls_peer_ocsp_result(tls_ctx));
1563: fprintf(stderr,
1564: " response_status=%d cert_status=%d crl_reason=%d\n",
1565: tls_peer_ocsp_response_status(tls_ctx),
1566: tls_peer_ocsp_cert_status(tls_ctx),
1567: tls_peer_ocsp_crl_reason(tls_ctx));
1568: t = tls_peer_ocsp_this_update(tls_ctx);
1569: fprintf(stderr, " this update: %s",
1570: t != -1 ? ctime(&t) : "\n");
1571: t = tls_peer_ocsp_next_update(tls_ctx);
1572: fprintf(stderr, " next update: %s",
1573: t != -1 ? ctime(&t) : "\n");
1574: t = tls_peer_ocsp_revocation_time(tls_ctx);
1575: fprintf(stderr, " revocation: %s",
1576: t != -1 ? ctime(&t) : "\n");
1577: break;
1578: case -1:
1579: break;
1580: default:
1.165 beck 1581: fprintf(stderr, "OCSP Stapling: failure - response_status %d (%s)\n",
1.164 beck 1582: tls_peer_ocsp_response_status(tls_ctx),
1583: tls_peer_ocsp_result(tls_ctx) == NULL ? "" :
1584: tls_peer_ocsp_result(tls_ctx));
1585: break;
1586:
1587: }
1.133 beck 1588: }
1.147 beck 1589:
1.108 haesbaer 1590: void
1.151 beck 1591: report_connect(const struct sockaddr *sa, socklen_t salen, char *path)
1.108 haesbaer 1592: {
1593: char remote_host[NI_MAXHOST];
1594: char remote_port[NI_MAXSERV];
1595: int herr;
1596: int flags = NI_NUMERICSERV;
1.151 beck 1597:
1598: if (path != NULL) {
1599: fprintf(stderr, "Connection on %s received!\n", path);
1600: return;
1601: }
1.134 deraadt 1602:
1.108 haesbaer 1603: if (nflag)
1604: flags |= NI_NUMERICHOST;
1.134 deraadt 1605:
1.108 haesbaer 1606: if ((herr = getnameinfo(sa, salen,
1607: remote_host, sizeof(remote_host),
1608: remote_port, sizeof(remote_port),
1609: flags)) != 0) {
1610: if (herr == EAI_SYSTEM)
1611: err(1, "getnameinfo");
1612: else
1613: errx(1, "getnameinfo: %s", gai_strerror(herr));
1614: }
1.134 deraadt 1615:
1.108 haesbaer 1616: fprintf(stderr,
1617: "Connection from %s %s "
1618: "received!\n", remote_host, remote_port);
1.7 deraadt 1619: }
1.1 deraadt 1620:
1.11 ericj 1621: void
1.58 deraadt 1622: help(void)
1.1 deraadt 1623: {
1.21 ericj 1624: usage(0);
1625: fprintf(stderr, "\tCommand Summary:\n\
1626: \t-4 Use IPv4\n\
1627: \t-6 Use IPv6\n\
1.135 jmc 1628: \t-C certfile Public key file\n\
1629: \t-c Use TLS\n\
1.73 markus 1630: \t-D Enable the debug socket option\n\
1.69 tedu 1631: \t-d Detach from stdin\n\
1.135 jmc 1632: \t-e name\t Required name in peer certificate\n\
1.114 jmc 1633: \t-F Pass socket fd\n\
1.135 jmc 1634: \t-H hash\t Hash string of peer certificate\n\
1.21 ericj 1635: \t-h This help text\n\
1.90 djm 1636: \t-I length TCP receive buffer length\n\
1.135 jmc 1637: \t-i interval Delay interval for lines sent, ports scanned\n\
1638: \t-K keyfile Private key file\n\
1.21 ericj 1639: \t-k Keep inbound sockets open for multiple connects\n\
1640: \t-l Listen mode, for inbound connects\n\
1.156 jca 1641: \t-M ttl Outgoing TTL / Hop Limit\n\
1642: \t-m minttl Minimum incoming TTL / Hop Limit\n\
1.111 sthen 1643: \t-N Shutdown the network socket after EOF on stdin\n\
1.22 jasoni 1644: \t-n Suppress name/port resolutions\n\
1.90 djm 1645: \t-O length TCP send buffer length\n\
1.169 jmc 1646: \t-o staplefile Staple file\n\
1.86 djm 1647: \t-P proxyuser\tUsername for proxy authentication\n\
1.36 jakob 1648: \t-p port\t Specify local port for remote connects\n\
1.135 jmc 1649: \t-R CAfile CA bundle\n\
1.21 ericj 1650: \t-r Randomize remote ports\n\
1.67 jmc 1651: \t-S Enable the TCP MD5 signature option\n\
1.135 jmc 1652: \t-s source Local source address\n\
1653: \t-T keyword TOS value or TLS options\n\
1.21 ericj 1654: \t-t Answer TELNET negotiation\n\
1.67 jmc 1655: \t-U Use UNIX domain socket\n\
1.21 ericj 1656: \t-u UDP mode\n\
1.98 guenther 1657: \t-V rtable Specify alternate routing table\n\
1.21 ericj 1658: \t-v Verbose\n\
1.135 jmc 1659: \t-w timeout Timeout for connects and final net reads\n\
1.75 djm 1660: \t-X proto Proxy protocol: \"4\", \"5\" (SOCKS) or \"connect\"\n\
1661: \t-x addr[:port]\tSpecify proxy address and port\n\
1.21 ericj 1662: \t-z Zero-I/O mode [used for scanning]\n\
1663: Port numbers can be individual or ranges: lo-hi [inclusive]\n");
1664: exit(1);
1.11 ericj 1665: }
1666:
1667: void
1.37 jakob 1668: usage(int ret)
1.11 ericj 1669: {
1.92 sobrado 1670: fprintf(stderr,
1.135 jmc 1671: "usage: nc [-46cDdFhklNnrStUuvz] [-C certfile] [-e name] "
1672: "[-H hash] [-I length]\n"
1.156 jca 1673: "\t [-i interval] [-K keyfile] [-M ttl] [-m minttl] [-O length]\n"
1.169 jmc 1674: "\t [-o staplefile] [-P proxy_username] [-p source_port] "
1675: "[-R CAfile]\n"
1676: "\t [-s source] [-T keyword] [-V rtable] [-w timeout] "
1677: "[-X proxy_protocol]\n"
1.156 jca 1678: "\t [-x proxy_address[:port]] [destination] [port]\n");
1.21 ericj 1679: if (ret)
1680: exit(1);
1.7 deraadt 1681: }
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