Annotation of src/usr.bin/nc/netcat.c, Revision 1.172
1.172 ! jca 1: /* $OpenBSD: netcat.c,v 1.171 2016/11/30 07:56:23 mestre 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;
1.172 ! jca 151: char *proxy, *proxyport = NULL;
! 152: const char *errstr;
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: if (sflag)
430: errx(1, "no proxy support for local source address");
431:
1.172 ! jca 432: if (*proxy == '[') {
! 433: ++proxy;
! 434: proxyport = strchr(proxy, ']');
! 435: if (proxyport == NULL)
! 436: errx(1, "missing closing bracket in proxy");
! 437: *proxyport++ = '\0';
! 438: if (*proxyport == '\0')
! 439: /* Use default proxy port. */
! 440: proxyport = NULL;
! 441: else {
! 442: if (*proxyport == ':')
! 443: ++proxyport;
! 444: else
! 445: errx(1, "garbage proxy port delimiter");
! 446: }
! 447: } else {
! 448: proxyport = strrchr(proxy, ':');
! 449: if (proxyport != NULL)
! 450: *proxyport++ = '\0';
! 451: }
1.34 jakob 452:
453: memset(&proxyhints, 0, sizeof(struct addrinfo));
454: proxyhints.ai_family = family;
455: proxyhints.ai_socktype = SOCK_STREAM;
456: proxyhints.ai_protocol = IPPROTO_TCP;
457: if (nflag)
458: proxyhints.ai_flags |= AI_NUMERICHOST;
459: }
460:
1.133 beck 461: if (usetls) {
1.152 beck 462: if (Pflag) {
1.162 jsing 463: if (pledge("stdio inet dns tty rpath", NULL) == -1)
1.152 beck 464: err(1, "pledge");
1.162 jsing 465: } else if (pledge("stdio inet dns rpath", NULL) == -1)
1.146 beck 466: err(1, "pledge");
467:
1.133 beck 468: if (tls_init() == -1)
469: errx(1, "unable to initialize TLS");
470: if ((tls_cfg = tls_config_new()) == NULL)
471: errx(1, "unable to allocate TLS config");
1.162 jsing 472: if (Rflag && tls_config_set_ca_file(tls_cfg, Rflag) == -1)
473: errx(1, "%s", tls_config_error(tls_cfg));
474: if (Cflag && tls_config_set_cert_file(tls_cfg, Cflag) == -1)
475: errx(1, "%s", tls_config_error(tls_cfg));
476: if (Kflag && tls_config_set_key_file(tls_cfg, Kflag) == -1)
1.168 beck 477: errx(1, "%s", tls_config_error(tls_cfg));
478: if (oflag && tls_config_set_ocsp_staple_file(tls_cfg, oflag) == -1)
1.162 jsing 479: errx(1, "%s", tls_config_error(tls_cfg));
1.170 beck 480: if (TLSopt & TLS_ALL) {
1.171 mestre 481: if (tls_config_set_protocols(tls_cfg,
482: TLS_PROTOCOLS_ALL) != 0)
483: errx(1, "%s", tls_config_error(tls_cfg));
484: if (tls_config_set_ciphers(tls_cfg, "all") != 0)
485: errx(1, "%s", tls_config_error(tls_cfg));
1.133 beck 486: }
487: if (!lflag && (TLSopt & TLS_CCERT))
488: errx(1, "clientcert is only valid with -l");
489: if (TLSopt & TLS_NONAME)
490: tls_config_insecure_noverifyname(tls_cfg);
491: if (TLSopt & TLS_NOVERIFY) {
492: if (tls_expecthash != NULL)
493: errx(1, "-H and -T noverify may not be used"
494: "together");
495: tls_config_insecure_noverifycert(tls_cfg);
496: }
1.167 beck 497: if (TLSopt & TLS_MUSTSTAPLE)
498: tls_config_ocsp_require_stapling(tls_cfg);
1.162 jsing 499:
500: if (Pflag) {
501: if (pledge("stdio inet dns tty", NULL) == -1)
502: err(1, "pledge");
503: } else if (pledge("stdio inet dns", NULL) == -1)
504: err(1, "pledge");
1.133 beck 505: }
1.21 ericj 506: if (lflag) {
1.133 beck 507: struct tls *tls_cctx = NULL;
1.21 ericj 508: int connfd;
1.27 ericj 509: ret = 0;
1.1 deraadt 510:
1.99 jeremy 511: if (family == AF_UNIX) {
512: if (uflag)
1.136 deraadt 513: s = unix_bind(host, 0);
1.99 jeremy 514: else
515: s = unix_listen(host);
516: }
1.42 ericj 517:
1.133 beck 518: if (usetls) {
519: tls_config_verify_client_optional(tls_cfg);
520: if ((tls_ctx = tls_server()) == NULL)
521: errx(1, "tls server creation failed");
522: if (tls_configure(tls_ctx, tls_cfg) == -1)
523: errx(1, "tls configuration failed (%s)",
524: tls_error(tls_ctx));
525: }
1.67 jmc 526: /* Allow only one connection at a time, but stay alive. */
1.21 ericj 527: for (;;) {
1.42 ericj 528: if (family != AF_UNIX)
529: s = local_listen(host, uport, hints);
530: if (s < 0)
1.30 smart 531: err(1, NULL);
1.21 ericj 532: /*
1.109 haesbaer 533: * For UDP and -k, don't connect the socket, let it
534: * receive datagrams from multiple socket pairs.
1.21 ericj 535: */
1.109 haesbaer 536: if (uflag && kflag)
1.133 beck 537: readwrite(s, NULL);
1.109 haesbaer 538: /*
539: * For UDP and not -k, we will use recvfrom() initially
540: * to wait for a caller, then use the regular functions
541: * to talk to the caller.
542: */
543: else if (uflag && !kflag) {
1.80 mcbride 544: int rv, plen;
1.97 nicm 545: char buf[16384];
1.21 ericj 546: struct sockaddr_storage z;
547:
548: len = sizeof(z);
1.106 dlg 549: plen = 2048;
1.80 mcbride 550: rv = recvfrom(s, buf, plen, MSG_PEEK,
1.37 jakob 551: (struct sockaddr *)&z, &len);
1.23 ericj 552: if (rv < 0)
1.57 stevesk 553: err(1, "recvfrom");
1.21 ericj 554:
1.37 jakob 555: rv = connect(s, (struct sockaddr *)&z, len);
1.23 ericj 556: if (rv < 0)
1.57 stevesk 557: err(1, "connect");
1.1 deraadt 558:
1.108 haesbaer 559: if (vflag)
1.151 beck 560: report_connect((struct sockaddr *)&z, len, NULL);
1.108 haesbaer 561:
1.133 beck 562: readwrite(s, NULL);
1.21 ericj 563: } else {
1.78 otto 564: len = sizeof(cliaddr);
1.132 bluhm 565: connfd = accept4(s, (struct sockaddr *)&cliaddr,
566: &len, SOCK_NONBLOCK);
1.110 deraadt 567: if (connfd == -1) {
568: /* For now, all errnos are fatal */
1.125 tedu 569: err(1, "accept");
1.110 deraadt 570: }
1.108 haesbaer 571: if (vflag)
1.151 beck 572: report_connect((struct sockaddr *)&cliaddr, len,
573: family == AF_UNIX ? host : NULL);
1.133 beck 574: if ((usetls) &&
1.134 deraadt 575: (tls_cctx = tls_setup_server(tls_ctx, connfd, host)))
1.133 beck 576: readwrite(connfd, tls_cctx);
577: if (!usetls)
578: readwrite(connfd, NULL);
579: if (tls_cctx) {
580: int i;
1.136 deraadt 581:
1.133 beck 582: do {
583: i = tls_close(tls_cctx);
584: } while (i == TLS_WANT_POLLIN ||
585: i == TLS_WANT_POLLOUT);
586: tls_free(tls_cctx);
587: tls_cctx = NULL;
588: }
1.99 jeremy 589: close(connfd);
1.21 ericj 590: }
1.42 ericj 591: if (family != AF_UNIX)
592: close(s);
1.99 jeremy 593: else if (uflag) {
594: if (connect(s, NULL, 0) < 0)
595: err(1, "connect");
596: }
1.27 ericj 597:
1.21 ericj 598: if (!kflag)
599: break;
1.11 ericj 600: }
1.42 ericj 601: } else if (family == AF_UNIX) {
602: ret = 0;
603:
604: if ((s = unix_connect(host)) > 0 && !zflag) {
1.133 beck 605: readwrite(s, NULL);
1.42 ericj 606: close(s);
607: } else
608: ret = 1;
609:
1.99 jeremy 610: if (uflag)
611: unlink(unix_dg_tmp_socket);
1.42 ericj 612: exit(ret);
613:
1.21 ericj 614: } else {
615: int i = 0;
1.6 deraadt 616:
1.67 jmc 617: /* Construct the portlist[] array. */
1.21 ericj 618: build_ports(uport);
1.1 deraadt 619:
1.67 jmc 620: /* Cycle through portlist, connecting to each port. */
1.154 deraadt 621: for (s = -1, i = 0; portlist[i] != NULL; i++) {
622: if (s != -1)
1.21 ericj 623: close(s);
1.34 jakob 624:
1.133 beck 625: if (usetls) {
626: if ((tls_ctx = tls_client()) == NULL)
627: errx(1, "tls client creation failed");
628: if (tls_configure(tls_ctx, tls_cfg) == -1)
629: errx(1, "tls configuration failed (%s)",
630: tls_error(tls_ctx));
631: }
1.34 jakob 632: if (xflag)
633: s = socks_connect(host, portlist[i], hints,
1.172 ! jca 634: proxy, proxyport, proxyhints, socksv,
1.86 djm 635: Pflag);
1.34 jakob 636: else
637: s = remote_connect(host, portlist[i], hints);
638:
1.154 deraadt 639: if (s == -1)
1.21 ericj 640: continue;
1.1 deraadt 641:
1.21 ericj 642: ret = 0;
643: if (vflag || zflag) {
1.67 jmc 644: /* For UDP, make sure we are connected. */
1.21 ericj 645: if (uflag) {
1.50 vincent 646: if (udptest(s) == -1) {
1.21 ericj 647: ret = 1;
648: continue;
649: }
650: }
1.1 deraadt 651:
1.67 jmc 652: /* Don't look up port if -n. */
1.21 ericj 653: if (nflag)
654: sv = NULL;
655: else {
656: sv = getservbyport(
1.37 jakob 657: ntohs(atoi(portlist[i])),
658: uflag ? "udp" : "tcp");
1.21 ericj 659: }
1.50 vincent 660:
1.94 mpf 661: fprintf(stderr,
662: "Connection to %s %s port [%s/%s] "
663: "succeeded!\n", host, portlist[i],
664: uflag ? "udp" : "tcp",
1.37 jakob 665: sv ? sv->s_name : "*");
1.21 ericj 666: }
1.113 djm 667: if (Fflag)
668: fdpass(s);
1.133 beck 669: else {
670: if (usetls)
671: tls_setup_client(tls_ctx, s, host);
672: if (!zflag)
673: readwrite(s, tls_ctx);
674: if (tls_ctx) {
675: int j;
1.136 deraadt 676:
1.133 beck 677: do {
678: j = tls_close(tls_ctx);
679: } while (j == TLS_WANT_POLLIN ||
680: j == TLS_WANT_POLLOUT);
681: tls_free(tls_ctx);
682: tls_ctx = NULL;
683: }
684: }
1.7 deraadt 685: }
1.11 ericj 686: }
1.1 deraadt 687:
1.154 deraadt 688: if (s != -1)
1.21 ericj 689: close(s);
690:
1.133 beck 691: tls_config_free(tls_cfg);
692:
1.21 ericj 693: exit(ret);
1.7 deraadt 694: }
1.1 deraadt 695:
1.11 ericj 696: /*
1.99 jeremy 697: * unix_bind()
698: * Returns a unix socket bound to the given path
1.42 ericj 699: */
700: int
1.136 deraadt 701: unix_bind(char *path, int flags)
1.42 ericj 702: {
1.144 bcook 703: struct sockaddr_un s_un;
1.155 deraadt 704: int s, save_errno;
1.42 ericj 705:
1.99 jeremy 706: /* Create unix domain socket. */
1.136 deraadt 707: if ((s = socket(AF_UNIX, flags | (uflag ? SOCK_DGRAM : SOCK_STREAM),
708: 0)) < 0)
1.50 vincent 709: return (-1);
1.42 ericj 710:
1.144 bcook 711: memset(&s_un, 0, sizeof(struct sockaddr_un));
712: s_un.sun_family = AF_UNIX;
1.60 avsm 713:
1.144 bcook 714: if (strlcpy(s_un.sun_path, path, sizeof(s_un.sun_path)) >=
715: sizeof(s_un.sun_path)) {
1.60 avsm 716: close(s);
717: errno = ENAMETOOLONG;
718: return (-1);
719: }
1.99 jeremy 720:
1.144 bcook 721: if (bind(s, (struct sockaddr *)&s_un, sizeof(s_un)) < 0) {
1.155 deraadt 722: save_errno = errno;
1.50 vincent 723: close(s);
1.155 deraadt 724: errno = save_errno;
1.50 vincent 725: return (-1);
1.42 ericj 726: }
727: return (s);
728: }
729:
1.133 beck 730: void
731: tls_setup_client(struct tls *tls_ctx, int s, char *host)
732: {
733: int i;
1.136 deraadt 734:
1.133 beck 735: if (tls_connect_socket(tls_ctx, s,
736: tls_expectname ? tls_expectname : host) == -1) {
737: errx(1, "tls connection failed (%s)",
738: tls_error(tls_ctx));
739: }
740: do {
741: if ((i = tls_handshake(tls_ctx)) == -1)
742: errx(1, "tls handshake failed (%s)",
743: tls_error(tls_ctx));
744: } while (i == TLS_WANT_POLLIN || i == TLS_WANT_POLLOUT);
745: if (vflag)
746: report_tls(tls_ctx, host, tls_expectname);
1.137 beck 747: if (tls_expecthash && tls_peer_cert_hash(tls_ctx) &&
748: strcmp(tls_expecthash, tls_peer_cert_hash(tls_ctx)) != 0)
1.133 beck 749: errx(1, "peer certificate is not %s", tls_expecthash);
750: }
1.141 deraadt 751:
1.133 beck 752: struct tls *
753: tls_setup_server(struct tls *tls_ctx, int connfd, char *host)
754: {
755: struct tls *tls_cctx;
1.136 deraadt 756:
1.133 beck 757: if (tls_accept_socket(tls_ctx, &tls_cctx,
758: connfd) == -1) {
759: warnx("tls accept failed (%s)",
760: tls_error(tls_ctx));
761: tls_cctx = NULL;
762: } else {
763: int i;
1.136 deraadt 764:
1.133 beck 765: do {
766: if ((i = tls_handshake(tls_cctx)) == -1)
767: warnx("tls handshake failed (%s)",
768: tls_error(tls_cctx));
769: } while(i == TLS_WANT_POLLIN || i == TLS_WANT_POLLOUT);
770: }
771: if (tls_cctx) {
772: int gotcert = tls_peer_cert_provided(tls_cctx);
1.136 deraadt 773:
1.133 beck 774: if (vflag && gotcert)
775: report_tls(tls_cctx, host, tls_expectname);
776: if ((TLSopt & TLS_CCERT) && !gotcert)
777: warnx("No client certificate provided");
1.137 beck 778: else if (gotcert && tls_peer_cert_hash(tls_ctx) && tls_expecthash &&
779: strcmp(tls_expecthash, tls_peer_cert_hash(tls_ctx)) != 0)
1.133 beck 780: warnx("peer certificate is not %s", tls_expecthash);
781: else if (gotcert && tls_expectname &&
1.134 deraadt 782: (!tls_peer_cert_contains_name(tls_cctx, tls_expectname)))
1.133 beck 783: warnx("name (%s) not found in client cert",
784: tls_expectname);
785: else {
786: return tls_cctx;
787: }
788: }
789: return NULL;
790: }
1.141 deraadt 791:
1.42 ericj 792: /*
1.99 jeremy 793: * unix_connect()
794: * Returns a socket connected to a local unix socket. Returns -1 on failure.
1.42 ericj 795: */
796: int
1.99 jeremy 797: unix_connect(char *path)
1.42 ericj 798: {
1.144 bcook 799: struct sockaddr_un s_un;
1.155 deraadt 800: int s, save_errno;
1.42 ericj 801:
1.99 jeremy 802: if (uflag) {
1.136 deraadt 803: if ((s = unix_bind(unix_dg_tmp_socket, SOCK_CLOEXEC)) < 0)
1.99 jeremy 804: return (-1);
805: } else {
1.136 deraadt 806: if ((s = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0)) < 0)
1.99 jeremy 807: return (-1);
808: }
1.42 ericj 809:
1.144 bcook 810: memset(&s_un, 0, sizeof(struct sockaddr_un));
811: s_un.sun_family = AF_UNIX;
1.60 avsm 812:
1.144 bcook 813: if (strlcpy(s_un.sun_path, path, sizeof(s_un.sun_path)) >=
814: sizeof(s_un.sun_path)) {
1.60 avsm 815: close(s);
816: errno = ENAMETOOLONG;
817: return (-1);
818: }
1.144 bcook 819: if (connect(s, (struct sockaddr *)&s_un, sizeof(s_un)) < 0) {
1.155 deraadt 820: save_errno = errno;
1.42 ericj 821: close(s);
1.155 deraadt 822: errno = save_errno;
1.42 ericj 823: return (-1);
824: }
1.99 jeremy 825: return (s);
826:
827: }
828:
829: /*
830: * unix_listen()
831: * Create a unix domain socket, and listen on it.
832: */
833: int
834: unix_listen(char *path)
835: {
836: int s;
1.136 deraadt 837: if ((s = unix_bind(path, 0)) < 0)
1.99 jeremy 838: return (-1);
1.42 ericj 839:
840: if (listen(s, 5) < 0) {
841: close(s);
842: return (-1);
843: }
844: return (s);
845: }
846:
847: /*
1.21 ericj 848: * remote_connect()
1.67 jmc 849: * Returns a socket connected to a remote host. Properly binds to a local
850: * port or source address if needed. Returns -1 on failure.
1.11 ericj 851: */
1.21 ericj 852: int
1.77 otto 853: remote_connect(const char *host, const char *port, struct addrinfo hints)
1.21 ericj 854: {
855: struct addrinfo *res, *res0;
1.163 bcook 856: int s = -1, error, on = 1, save_errno;
1.21 ericj 857:
1.161 halex 858: if ((error = getaddrinfo(host, port, &hints, &res0)))
1.56 stevesk 859: errx(1, "getaddrinfo: %s", gai_strerror(error));
1.21 ericj 860:
1.161 halex 861: for (res = res0; res; res = res->ai_next) {
862: if ((s = socket(res->ai_family, res->ai_socktype |
863: SOCK_NONBLOCK, res->ai_protocol)) < 0)
1.21 ericj 864: continue;
865:
1.67 jmc 866: /* Bind to a local port or source address if specified. */
1.21 ericj 867: if (sflag || pflag) {
868: struct addrinfo ahints, *ares;
1.6 deraadt 869:
1.91 markus 870: /* try SO_BINDANY, but don't insist */
871: setsockopt(s, SOL_SOCKET, SO_BINDANY, &on, sizeof(on));
1.21 ericj 872: memset(&ahints, 0, sizeof(struct addrinfo));
1.161 halex 873: ahints.ai_family = res->ai_family;
1.21 ericj 874: ahints.ai_socktype = uflag ? SOCK_DGRAM : SOCK_STREAM;
875: ahints.ai_protocol = uflag ? IPPROTO_UDP : IPPROTO_TCP;
1.25 ericj 876: ahints.ai_flags = AI_PASSIVE;
1.38 jakob 877: if ((error = getaddrinfo(sflag, pflag, &ahints, &ares)))
1.56 stevesk 878: errx(1, "getaddrinfo: %s", gai_strerror(error));
1.21 ericj 879:
880: if (bind(s, (struct sockaddr *)ares->ai_addr,
1.62 millert 881: ares->ai_addrlen) < 0)
1.119 guenther 882: err(1, "bind failed");
1.21 ericj 883: freeaddrinfo(ares);
1.6 deraadt 884: }
1.81 marius 885:
1.161 halex 886: set_common_sockopts(s, res->ai_family);
1.6 deraadt 887:
1.161 halex 888: if (timeout_connect(s, res->ai_addr, res->ai_addrlen) == 0)
1.6 deraadt 889: break;
1.143 deraadt 890: if (vflag)
1.71 mcbride 891: warn("connect to %s port %s (%s) failed", host, port,
892: uflag ? "udp" : "tcp");
1.34 jakob 893:
1.155 deraadt 894: save_errno = errno;
1.21 ericj 895: close(s);
1.155 deraadt 896: errno = save_errno;
1.21 ericj 897: s = -1;
1.161 halex 898: }
1.21 ericj 899:
1.161 halex 900: freeaddrinfo(res0);
1.1 deraadt 901:
1.21 ericj 902: return (s);
1.103 fgsch 903: }
904:
905: int
906: timeout_connect(int s, const struct sockaddr *name, socklen_t namelen)
907: {
908: struct pollfd pfd;
909: socklen_t optlen;
1.132 bluhm 910: int optval;
1.103 fgsch 911: int ret;
912:
913: if ((ret = connect(s, name, namelen)) != 0 && errno == EINPROGRESS) {
914: pfd.fd = s;
915: pfd.events = POLLOUT;
916: if ((ret = poll(&pfd, 1, timeout)) == 1) {
917: optlen = sizeof(optval);
918: if ((ret = getsockopt(s, SOL_SOCKET, SO_ERROR,
919: &optval, &optlen)) == 0) {
920: errno = optval;
921: ret = optval == 0 ? 0 : -1;
922: }
923: } else if (ret == 0) {
924: errno = ETIMEDOUT;
925: ret = -1;
926: } else
927: err(1, "poll failed");
928: }
929:
930: return (ret);
1.7 deraadt 931: }
1.1 deraadt 932:
1.11 ericj 933: /*
1.21 ericj 934: * local_listen()
1.67 jmc 935: * Returns a socket listening on a local port, binds to specified source
936: * address. Returns -1 on failure.
1.11 ericj 937: */
1.21 ericj 938: int
1.37 jakob 939: local_listen(char *host, char *port, struct addrinfo hints)
1.21 ericj 940: {
941: struct addrinfo *res, *res0;
1.163 bcook 942: int s = -1, ret, x = 1, save_errno;
1.21 ericj 943: int error;
1.6 deraadt 944:
1.67 jmc 945: /* Allow nodename to be null. */
1.21 ericj 946: hints.ai_flags |= AI_PASSIVE;
1.7 deraadt 947:
1.21 ericj 948: /*
949: * In the case of binding to a wildcard address
950: * default to binding to an ipv4 address.
951: */
952: if (host == NULL && hints.ai_family == AF_UNSPEC)
953: hints.ai_family = AF_INET;
1.1 deraadt 954:
1.161 halex 955: if ((error = getaddrinfo(host, port, &hints, &res0)))
1.70 deraadt 956: errx(1, "getaddrinfo: %s", gai_strerror(error));
1.14 ericj 957:
1.161 halex 958: for (res = res0; res; res = res->ai_next) {
959: if ((s = socket(res->ai_family, res->ai_socktype,
960: res->ai_protocol)) < 0)
1.21 ericj 961: continue;
1.93 claudio 962:
1.21 ericj 963: ret = setsockopt(s, SOL_SOCKET, SO_REUSEPORT, &x, sizeof(x));
964: if (ret == -1)
1.30 smart 965: err(1, NULL);
1.81 marius 966:
1.161 halex 967: set_common_sockopts(s, res->ai_family);
1.1 deraadt 968:
1.161 halex 969: if (bind(s, (struct sockaddr *)res->ai_addr,
970: res->ai_addrlen) == 0)
1.21 ericj 971: break;
1.1 deraadt 972:
1.155 deraadt 973: save_errno = errno;
1.21 ericj 974: close(s);
1.155 deraadt 975: errno = save_errno;
1.21 ericj 976: s = -1;
1.161 halex 977: }
1.1 deraadt 978:
1.47 ericj 979: if (!uflag && s != -1) {
1.21 ericj 980: if (listen(s, 1) < 0)
1.57 stevesk 981: err(1, "listen");
1.12 ericj 982: }
1.1 deraadt 983:
1.161 halex 984: freeaddrinfo(res0);
1.1 deraadt 985:
1.21 ericj 986: return (s);
1.7 deraadt 987: }
988:
1.11 ericj 989: /*
1.21 ericj 990: * readwrite()
991: * Loop that polls on the network file descriptor and stdin.
1.11 ericj 992: */
1.21 ericj 993: void
1.133 beck 994: readwrite(int net_fd, struct tls *tls_ctx)
1.6 deraadt 995: {
1.125 tedu 996: struct pollfd pfd[4];
997: int stdin_fd = STDIN_FILENO;
998: int stdout_fd = STDOUT_FILENO;
999: unsigned char netinbuf[BUFSIZE];
1000: size_t netinbufpos = 0;
1001: unsigned char stdinbuf[BUFSIZE];
1002: size_t stdinbufpos = 0;
1.130 chl 1003: int n, num_fds;
1.125 tedu 1004: ssize_t ret;
1005:
1006: /* don't read from stdin if requested */
1007: if (dflag)
1008: stdin_fd = -1;
1009:
1010: /* stdin */
1011: pfd[POLL_STDIN].fd = stdin_fd;
1012: pfd[POLL_STDIN].events = POLLIN;
1013:
1014: /* network out */
1015: pfd[POLL_NETOUT].fd = net_fd;
1016: pfd[POLL_NETOUT].events = 0;
1017:
1018: /* network in */
1019: pfd[POLL_NETIN].fd = net_fd;
1020: pfd[POLL_NETIN].events = POLLIN;
1021:
1022: /* stdout */
1023: pfd[POLL_STDOUT].fd = stdout_fd;
1024: pfd[POLL_STDOUT].events = 0;
1025:
1026: while (1) {
1027: /* both inputs are gone, buffers are empty, we are done */
1.134 deraadt 1028: if (pfd[POLL_STDIN].fd == -1 && pfd[POLL_NETIN].fd == -1 &&
1029: stdinbufpos == 0 && netinbufpos == 0) {
1.125 tedu 1030: close(net_fd);
1031: return;
1032: }
1033: /* both outputs are gone, we can't continue */
1034: if (pfd[POLL_NETOUT].fd == -1 && pfd[POLL_STDOUT].fd == -1) {
1035: close(net_fd);
1036: return;
1037: }
1038: /* listen and net in gone, queues empty, done */
1.134 deraadt 1039: if (lflag && pfd[POLL_NETIN].fd == -1 &&
1040: stdinbufpos == 0 && netinbufpos == 0) {
1.125 tedu 1041: close(net_fd);
1042: return;
1043: }
1.21 ericj 1044:
1.125 tedu 1045: /* help says -i is for "wait between lines sent". We read and
1046: * write arbitrary amounts of data, and we don't want to start
1047: * scanning for newlines, so this is as good as it gets */
1.21 ericj 1048: if (iflag)
1049: sleep(iflag);
1050:
1.125 tedu 1051: /* poll */
1052: num_fds = poll(pfd, 4, timeout);
1053:
1054: /* treat poll errors */
1055: if (num_fds == -1) {
1056: close(net_fd);
1057: err(1, "polling error");
1.21 ericj 1058: }
1.49 hugh 1059:
1.125 tedu 1060: /* timeout happened */
1061: if (num_fds == 0)
1.49 hugh 1062: return;
1.21 ericj 1063:
1.125 tedu 1064: /* treat socket error conditions */
1065: for (n = 0; n < 4; n++) {
1066: if (pfd[n].revents & (POLLERR|POLLNVAL)) {
1067: pfd[n].fd = -1;
1.6 deraadt 1068: }
1.21 ericj 1069: }
1.125 tedu 1070: /* reading is possible after HUP */
1071: if (pfd[POLL_STDIN].events & POLLIN &&
1072: pfd[POLL_STDIN].revents & POLLHUP &&
1.134 deraadt 1073: !(pfd[POLL_STDIN].revents & POLLIN))
1074: pfd[POLL_STDIN].fd = -1;
1.125 tedu 1075:
1076: if (pfd[POLL_NETIN].events & POLLIN &&
1077: pfd[POLL_NETIN].revents & POLLHUP &&
1.134 deraadt 1078: !(pfd[POLL_NETIN].revents & POLLIN))
1079: pfd[POLL_NETIN].fd = -1;
1.125 tedu 1080:
1081: if (pfd[POLL_NETOUT].revents & POLLHUP) {
1082: if (Nflag)
1083: shutdown(pfd[POLL_NETOUT].fd, SHUT_WR);
1084: pfd[POLL_NETOUT].fd = -1;
1085: }
1086: /* if HUP, stop watching stdout */
1087: if (pfd[POLL_STDOUT].revents & POLLHUP)
1088: pfd[POLL_STDOUT].fd = -1;
1089: /* if no net out, stop watching stdin */
1090: if (pfd[POLL_NETOUT].fd == -1)
1091: pfd[POLL_STDIN].fd = -1;
1092: /* if no stdout, stop watching net in */
1093: if (pfd[POLL_STDOUT].fd == -1) {
1094: if (pfd[POLL_NETIN].fd != -1)
1095: shutdown(pfd[POLL_NETIN].fd, SHUT_RD);
1096: pfd[POLL_NETIN].fd = -1;
1097: }
1.21 ericj 1098:
1.125 tedu 1099: /* try to read from stdin */
1100: if (pfd[POLL_STDIN].revents & POLLIN && stdinbufpos < BUFSIZE) {
1101: ret = fillbuf(pfd[POLL_STDIN].fd, stdinbuf,
1.133 beck 1102: &stdinbufpos, NULL);
1103: if (ret == TLS_WANT_POLLIN)
1104: pfd[POLL_STDIN].events = POLLIN;
1105: else if (ret == TLS_WANT_POLLOUT)
1106: pfd[POLL_STDIN].events = POLLOUT;
1107: else if (ret == 0 || ret == -1)
1.125 tedu 1108: pfd[POLL_STDIN].fd = -1;
1109: /* read something - poll net out */
1110: if (stdinbufpos > 0)
1111: pfd[POLL_NETOUT].events = POLLOUT;
1112: /* filled buffer - remove self from polling */
1113: if (stdinbufpos == BUFSIZE)
1114: pfd[POLL_STDIN].events = 0;
1115: }
1116: /* try to write to network */
1117: if (pfd[POLL_NETOUT].revents & POLLOUT && stdinbufpos > 0) {
1118: ret = drainbuf(pfd[POLL_NETOUT].fd, stdinbuf,
1.133 beck 1119: &stdinbufpos, tls_ctx);
1120: if (ret == TLS_WANT_POLLIN)
1121: pfd[POLL_NETOUT].events = POLLIN;
1122: else if (ret == TLS_WANT_POLLOUT)
1123: pfd[POLL_NETOUT].events = POLLOUT;
1124: else if (ret == -1)
1.125 tedu 1125: pfd[POLL_NETOUT].fd = -1;
1126: /* buffer empty - remove self from polling */
1127: if (stdinbufpos == 0)
1128: pfd[POLL_NETOUT].events = 0;
1129: /* buffer no longer full - poll stdin again */
1130: if (stdinbufpos < BUFSIZE)
1131: pfd[POLL_STDIN].events = POLLIN;
1132: }
1133: /* try to read from network */
1134: if (pfd[POLL_NETIN].revents & POLLIN && netinbufpos < BUFSIZE) {
1135: ret = fillbuf(pfd[POLL_NETIN].fd, netinbuf,
1.133 beck 1136: &netinbufpos, tls_ctx);
1137: if (ret == TLS_WANT_POLLIN)
1138: pfd[POLL_NETIN].events = POLLIN;
1139: else if (ret == TLS_WANT_POLLOUT)
1140: pfd[POLL_NETIN].events = POLLOUT;
1141: else if (ret == -1)
1.125 tedu 1142: pfd[POLL_NETIN].fd = -1;
1143: /* eof on net in - remove from pfd */
1144: if (ret == 0) {
1145: shutdown(pfd[POLL_NETIN].fd, SHUT_RD);
1146: pfd[POLL_NETIN].fd = -1;
1.50 vincent 1147: }
1.125 tedu 1148: /* read something - poll stdout */
1149: if (netinbufpos > 0)
1150: pfd[POLL_STDOUT].events = POLLOUT;
1151: /* filled buffer - remove self from polling */
1152: if (netinbufpos == BUFSIZE)
1153: pfd[POLL_NETIN].events = 0;
1154: /* handle telnet */
1155: if (tflag)
1156: atelnet(pfd[POLL_NETIN].fd, netinbuf,
1157: netinbufpos);
1158: }
1159: /* try to write to stdout */
1160: if (pfd[POLL_STDOUT].revents & POLLOUT && netinbufpos > 0) {
1161: ret = drainbuf(pfd[POLL_STDOUT].fd, netinbuf,
1.133 beck 1162: &netinbufpos, NULL);
1163: if (ret == TLS_WANT_POLLIN)
1164: pfd[POLL_STDOUT].events = POLLIN;
1165: else if (ret == TLS_WANT_POLLOUT)
1166: pfd[POLL_STDOUT].events = POLLOUT;
1167: else if (ret == -1)
1.125 tedu 1168: pfd[POLL_STDOUT].fd = -1;
1169: /* buffer empty - remove self from polling */
1170: if (netinbufpos == 0)
1171: pfd[POLL_STDOUT].events = 0;
1172: /* buffer no longer full - poll net in again */
1173: if (netinbufpos < BUFSIZE)
1174: pfd[POLL_NETIN].events = POLLIN;
1175: }
1176:
1177: /* stdin gone and queue empty? */
1178: if (pfd[POLL_STDIN].fd == -1 && stdinbufpos == 0) {
1179: if (pfd[POLL_NETOUT].fd != -1 && Nflag)
1180: shutdown(pfd[POLL_NETOUT].fd, SHUT_WR);
1181: pfd[POLL_NETOUT].fd = -1;
1182: }
1183: /* net in gone and queue empty? */
1184: if (pfd[POLL_NETIN].fd == -1 && netinbufpos == 0) {
1185: pfd[POLL_STDOUT].fd = -1;
1.21 ericj 1186: }
1.11 ericj 1187: }
1.125 tedu 1188: }
1189:
1190: ssize_t
1.133 beck 1191: drainbuf(int fd, unsigned char *buf, size_t *bufpos, struct tls *tls)
1.125 tedu 1192: {
1193: ssize_t n;
1194: ssize_t adjust;
1195:
1.133 beck 1196: if (tls)
1197: n = tls_write(tls, buf, *bufpos);
1198: else {
1199: n = write(fd, buf, *bufpos);
1200: /* don't treat EAGAIN, EINTR as error */
1201: if (n == -1 && (errno == EAGAIN || errno == EINTR))
1202: n = TLS_WANT_POLLOUT;
1203: }
1.125 tedu 1204: if (n <= 0)
1205: return n;
1206: /* adjust buffer */
1207: adjust = *bufpos - n;
1208: if (adjust > 0)
1209: memmove(buf, buf + n, adjust);
1210: *bufpos -= n;
1211: return n;
1212: }
1213:
1214: ssize_t
1.133 beck 1215: fillbuf(int fd, unsigned char *buf, size_t *bufpos, struct tls *tls)
1.125 tedu 1216: {
1217: size_t num = BUFSIZE - *bufpos;
1218: ssize_t n;
1219:
1.133 beck 1220: if (tls)
1221: n = tls_read(tls, buf + *bufpos, num);
1222: else {
1223: n = read(fd, buf + *bufpos, num);
1224: /* don't treat EAGAIN, EINTR as error */
1225: if (n == -1 && (errno == EAGAIN || errno == EINTR))
1226: n = TLS_WANT_POLLIN;
1227: }
1.125 tedu 1228: if (n <= 0)
1229: return n;
1230: *bufpos += n;
1231: return n;
1.113 djm 1232: }
1233:
1234: /*
1235: * fdpass()
1236: * Pass the connected file descriptor to stdout and exit.
1237: */
1238: void
1239: fdpass(int nfd)
1240: {
1241: struct msghdr mh;
1242: union {
1243: struct cmsghdr hdr;
1244: char buf[CMSG_SPACE(sizeof(int))];
1245: } cmsgbuf;
1246: struct cmsghdr *cmsg;
1247: struct iovec iov;
1248: char c = '\0';
1249: ssize_t r;
1250: struct pollfd pfd;
1251:
1252: /* Avoid obvious stupidity */
1253: if (isatty(STDOUT_FILENO))
1254: errx(1, "Cannot pass file descriptor to tty");
1255:
1256: bzero(&mh, sizeof(mh));
1257: bzero(&cmsgbuf, sizeof(cmsgbuf));
1258: bzero(&iov, sizeof(iov));
1259:
1260: mh.msg_control = (caddr_t)&cmsgbuf.buf;
1261: mh.msg_controllen = sizeof(cmsgbuf.buf);
1262: cmsg = CMSG_FIRSTHDR(&mh);
1263: cmsg->cmsg_len = CMSG_LEN(sizeof(int));
1264: cmsg->cmsg_level = SOL_SOCKET;
1265: cmsg->cmsg_type = SCM_RIGHTS;
1266: *(int *)CMSG_DATA(cmsg) = nfd;
1267:
1268: iov.iov_base = &c;
1269: iov.iov_len = 1;
1270: mh.msg_iov = &iov;
1271: mh.msg_iovlen = 1;
1272:
1273: bzero(&pfd, sizeof(pfd));
1274: pfd.fd = STDOUT_FILENO;
1.128 tobias 1275: pfd.events = POLLOUT;
1.113 djm 1276: for (;;) {
1277: r = sendmsg(STDOUT_FILENO, &mh, 0);
1278: if (r == -1) {
1279: if (errno == EAGAIN || errno == EINTR) {
1280: if (poll(&pfd, 1, -1) == -1)
1281: err(1, "poll");
1282: continue;
1283: }
1284: err(1, "sendmsg");
1.128 tobias 1285: } else if (r != 1)
1.113 djm 1286: errx(1, "sendmsg: unexpected return value %zd", r);
1287: else
1288: break;
1289: }
1290: exit(0);
1.7 deraadt 1291: }
1.50 vincent 1292:
1.67 jmc 1293: /* Deal with RFC 854 WILL/WONT DO/DONT negotiation. */
1.21 ericj 1294: void
1.37 jakob 1295: atelnet(int nfd, unsigned char *buf, unsigned int size)
1.6 deraadt 1296: {
1.24 ericj 1297: unsigned char *p, *end;
1298: unsigned char obuf[4];
1299:
1.95 nicm 1300: if (size < 3)
1301: return;
1302: end = buf + size - 2;
1.24 ericj 1303:
1304: for (p = buf; p < end; p++) {
1.21 ericj 1305: if (*p != IAC)
1.95 nicm 1306: continue;
1.24 ericj 1307:
1.25 ericj 1308: obuf[0] = IAC;
1.24 ericj 1309: p++;
1.50 vincent 1310: if ((*p == WILL) || (*p == WONT))
1.24 ericj 1311: obuf[1] = DONT;
1.95 nicm 1312: else if ((*p == DO) || (*p == DONT))
1.24 ericj 1313: obuf[1] = WONT;
1.95 nicm 1314: else
1315: continue;
1316:
1317: p++;
1318: obuf[2] = *p;
1319: if (atomicio(vwrite, nfd, obuf, 3) != 3)
1320: warn("Write Error!");
1.11 ericj 1321: }
1.7 deraadt 1322: }
1323:
1.153 beck 1324:
1325: int
1326: strtoport(char *portstr, int udp)
1327: {
1328: struct servent *entry;
1329: const char *errstr;
1330: char *proto;
1331: int port = -1;
1332:
1333: proto = udp ? "udp" : "tcp";
1334:
1335: port = strtonum(portstr, 1, PORT_MAX, &errstr);
1336: if (errstr == NULL)
1337: return port;
1338: if (errno != EINVAL)
1339: errx(1, "port number %s: %s", errstr, portstr);
1340: if ((entry = getservbyname(portstr, proto)) == NULL)
1341: errx(1, "service \"%s\" unknown", portstr);
1342: return ntohs(entry->s_port);
1343: }
1344:
1.11 ericj 1345: /*
1.21 ericj 1346: * build_ports()
1.105 lum 1347: * Build an array of ports in portlist[], listing each port
1.67 jmc 1348: * that we should try to connect to.
1.11 ericj 1349: */
1.21 ericj 1350: void
1.37 jakob 1351: build_ports(char *p)
1.6 deraadt 1352: {
1.88 ray 1353: char *n;
1.21 ericj 1354: int hi, lo, cp;
1355: int x = 0;
1356:
1357: if ((n = strchr(p, '-')) != NULL) {
1358: *n = '\0';
1359: n++;
1360:
1.67 jmc 1361: /* Make sure the ports are in order: lowest->highest. */
1.153 beck 1362: hi = strtoport(n, uflag);
1363: lo = strtoport(p, uflag);
1.21 ericj 1364: if (lo > hi) {
1365: cp = hi;
1366: hi = lo;
1367: lo = cp;
1368: }
1369:
1.145 tb 1370: /*
1371: * Initialize portlist with a random permutation. Based on
1372: * Knuth, as in ip_randomid() in sys/netinet/ip_id.c.
1373: */
1.21 ericj 1374: if (rflag) {
1.145 tb 1375: for (x = 0; x <= hi - lo; x++) {
1376: cp = arc4random_uniform(x + 1);
1377: portlist[x] = portlist[cp];
1378: if (asprintf(&portlist[cp], "%d", x + lo) < 0)
1379: err(1, "asprintf");
1380: }
1381: } else { /* Load ports sequentially. */
1382: for (cp = lo; cp <= hi; cp++) {
1383: if (asprintf(&portlist[x], "%d", cp) < 0)
1384: err(1, "asprintf");
1385: x++;
1.6 deraadt 1386: }
1.11 ericj 1387: }
1.21 ericj 1388: } else {
1.153 beck 1389: char *tmp;
1390:
1391: hi = strtoport(p, uflag);
1392: if (asprintf(&tmp, "%d", hi) != -1)
1393: portlist[0] = tmp;
1394: else
1.55 fgsch 1395: err(1, NULL);
1.11 ericj 1396: }
1.13 ericj 1397: }
1398:
1399: /*
1.21 ericj 1400: * udptest()
1401: * Do a few writes to see if the UDP port is there.
1.105 lum 1402: * Fails once PF state table is full.
1.13 ericj 1403: */
1.21 ericj 1404: int
1.37 jakob 1405: udptest(int s)
1.13 ericj 1406: {
1.74 deraadt 1407: int i, ret;
1.13 ericj 1408:
1.52 vincent 1409: for (i = 0; i <= 3; i++) {
1.74 deraadt 1410: if (write(s, "X", 1) == 1)
1.21 ericj 1411: ret = 1;
1.14 ericj 1412: else
1.21 ericj 1413: ret = -1;
1.14 ericj 1414: }
1.21 ericj 1415: return (ret);
1.81 marius 1416: }
1417:
1.84 dtucker 1418: void
1.127 jca 1419: set_common_sockopts(int s, int af)
1.81 marius 1420: {
1421: int x = 1;
1422:
1423: if (Sflag) {
1424: if (setsockopt(s, IPPROTO_TCP, TCP_MD5SIG,
1425: &x, sizeof(x)) == -1)
1426: err(1, NULL);
1427: }
1428: if (Dflag) {
1429: if (setsockopt(s, SOL_SOCKET, SO_DEBUG,
1430: &x, sizeof(x)) == -1)
1431: err(1, NULL);
1432: }
1.83 dtucker 1433: if (Tflag != -1) {
1.157 bcook 1434: if (af == AF_INET && setsockopt(s, IPPROTO_IP,
1435: IP_TOS, &Tflag, sizeof(Tflag)) == -1)
1436: err(1, "set IP ToS");
1.127 jca 1437:
1.157 bcook 1438: else if (af == AF_INET6 && setsockopt(s, IPPROTO_IPV6,
1439: IPV6_TCLASS, &Tflag, sizeof(Tflag)) == -1)
1440: err(1, "set IPv6 traffic class");
1.83 dtucker 1441: }
1.90 djm 1442: if (Iflag) {
1443: if (setsockopt(s, SOL_SOCKET, SO_RCVBUF,
1444: &Iflag, sizeof(Iflag)) == -1)
1445: err(1, "set TCP receive buffer size");
1446: }
1447: if (Oflag) {
1448: if (setsockopt(s, SOL_SOCKET, SO_SNDBUF,
1449: &Oflag, sizeof(Oflag)) == -1)
1450: err(1, "set TCP send buffer size");
1451: }
1.157 bcook 1452:
1453: if (ttl != -1) {
1454: if (af == AF_INET && setsockopt(s, IPPROTO_IP,
1455: IP_TTL, &ttl, sizeof(ttl)))
1456: err(1, "set IP TTL");
1457:
1458: else if (af == AF_INET6 && setsockopt(s, IPPROTO_IPV6,
1459: IPV6_UNICAST_HOPS, &ttl, sizeof(ttl)))
1460: err(1, "set IPv6 unicast hops");
1461: }
1462:
1463: if (minttl != -1) {
1464: if (af == AF_INET && setsockopt(s, IPPROTO_IP,
1465: IP_MINTTL, &minttl, sizeof(minttl)))
1466: err(1, "set IP min TTL");
1467:
1468: else if (af == AF_INET6 && setsockopt(s, IPPROTO_IPV6,
1469: IPV6_MINHOPCOUNT, &minttl, sizeof(minttl)))
1470: err(1, "set IPv6 min hop count");
1.156 jca 1471: }
1.83 dtucker 1472: }
1473:
1474: int
1.102 haesbaer 1475: map_tos(char *s, int *val)
1.83 dtucker 1476: {
1.102 haesbaer 1477: /* DiffServ Codepoints and other TOS mappings */
1478: const struct toskeywords {
1479: const char *keyword;
1480: int val;
1481: } *t, toskeywords[] = {
1482: { "af11", IPTOS_DSCP_AF11 },
1483: { "af12", IPTOS_DSCP_AF12 },
1484: { "af13", IPTOS_DSCP_AF13 },
1485: { "af21", IPTOS_DSCP_AF21 },
1486: { "af22", IPTOS_DSCP_AF22 },
1487: { "af23", IPTOS_DSCP_AF23 },
1488: { "af31", IPTOS_DSCP_AF31 },
1489: { "af32", IPTOS_DSCP_AF32 },
1490: { "af33", IPTOS_DSCP_AF33 },
1491: { "af41", IPTOS_DSCP_AF41 },
1492: { "af42", IPTOS_DSCP_AF42 },
1493: { "af43", IPTOS_DSCP_AF43 },
1494: { "critical", IPTOS_PREC_CRITIC_ECP },
1495: { "cs0", IPTOS_DSCP_CS0 },
1496: { "cs1", IPTOS_DSCP_CS1 },
1497: { "cs2", IPTOS_DSCP_CS2 },
1498: { "cs3", IPTOS_DSCP_CS3 },
1499: { "cs4", IPTOS_DSCP_CS4 },
1500: { "cs5", IPTOS_DSCP_CS5 },
1501: { "cs6", IPTOS_DSCP_CS6 },
1502: { "cs7", IPTOS_DSCP_CS7 },
1503: { "ef", IPTOS_DSCP_EF },
1504: { "inetcontrol", IPTOS_PREC_INTERNETCONTROL },
1505: { "lowdelay", IPTOS_LOWDELAY },
1506: { "netcontrol", IPTOS_PREC_NETCONTROL },
1507: { "reliability", IPTOS_RELIABILITY },
1508: { "throughput", IPTOS_THROUGHPUT },
1.134 deraadt 1509: { NULL, -1 },
1.102 haesbaer 1510: };
1511:
1512: for (t = toskeywords; t->keyword != NULL; t++) {
1513: if (strcmp(s, t->keyword) == 0) {
1514: *val = t->val;
1515: return (1);
1516: }
1517: }
1.83 dtucker 1518:
1.102 haesbaer 1519: return (0);
1.108 haesbaer 1520: }
1521:
1.133 beck 1522: int
1523: map_tls(char *s, int *val)
1524: {
1525: const struct tlskeywords {
1526: const char *keyword;
1527: int val;
1528: } *t, tlskeywords[] = {
1.170 beck 1529: { "tlsall", TLS_ALL },
1.133 beck 1530: { "noverify", TLS_NOVERIFY },
1531: { "noname", TLS_NONAME },
1532: { "clientcert", TLS_CCERT},
1.167 beck 1533: { "muststaple", TLS_MUSTSTAPLE},
1.134 deraadt 1534: { NULL, -1 },
1.133 beck 1535: };
1536:
1537: for (t = tlskeywords; t->keyword != NULL; t++) {
1538: if (strcmp(s, t->keyword) == 0) {
1539: *val |= t->val;
1540: return (1);
1541: }
1542: }
1543: return (0);
1544: }
1545:
1546: void
1547: report_tls(struct tls * tls_ctx, char * host, char *tls_expectname)
1548: {
1.147 beck 1549: time_t t;
1.164 beck 1550: const char *ocsp_url;
1551:
1.138 beck 1552: fprintf(stderr, "TLS handshake negotiated %s/%s with host %s\n",
1553: tls_conn_version(tls_ctx), tls_conn_cipher(tls_ctx), host);
1.148 mmcc 1554: fprintf(stderr, "Peer name: %s\n",
1.133 beck 1555: tls_expectname ? tls_expectname : host);
1.137 beck 1556: if (tls_peer_cert_subject(tls_ctx))
1557: fprintf(stderr, "Subject: %s\n",
1558: tls_peer_cert_subject(tls_ctx));
1559: if (tls_peer_cert_issuer(tls_ctx))
1560: fprintf(stderr, "Issuer: %s\n",
1561: tls_peer_cert_issuer(tls_ctx));
1.147 beck 1562: if ((t = tls_peer_cert_notbefore(tls_ctx)) != -1)
1563: fprintf(stderr, "Valid From: %s", ctime(&t));
1564: if ((t = tls_peer_cert_notafter(tls_ctx)) != -1)
1565: fprintf(stderr, "Valid Until: %s", ctime(&t));
1.137 beck 1566: if (tls_peer_cert_hash(tls_ctx))
1567: fprintf(stderr, "Cert Hash: %s\n",
1568: tls_peer_cert_hash(tls_ctx));
1.164 beck 1569: ocsp_url = tls_peer_ocsp_url(tls_ctx);
1.166 beck 1570: if (ocsp_url != NULL)
1571: fprintf(stderr, "OCSP URL: %s\n", ocsp_url);
1.164 beck 1572: switch (tls_peer_ocsp_response_status(tls_ctx)) {
1573: case TLS_OCSP_RESPONSE_SUCCESSFUL:
1.165 beck 1574: fprintf(stderr, "OCSP Stapling: %s\n",
1.164 beck 1575: tls_peer_ocsp_result(tls_ctx) == NULL ? "" :
1576: tls_peer_ocsp_result(tls_ctx));
1577: fprintf(stderr,
1578: " response_status=%d cert_status=%d crl_reason=%d\n",
1579: tls_peer_ocsp_response_status(tls_ctx),
1580: tls_peer_ocsp_cert_status(tls_ctx),
1581: tls_peer_ocsp_crl_reason(tls_ctx));
1582: t = tls_peer_ocsp_this_update(tls_ctx);
1583: fprintf(stderr, " this update: %s",
1584: t != -1 ? ctime(&t) : "\n");
1585: t = tls_peer_ocsp_next_update(tls_ctx);
1586: fprintf(stderr, " next update: %s",
1587: t != -1 ? ctime(&t) : "\n");
1588: t = tls_peer_ocsp_revocation_time(tls_ctx);
1589: fprintf(stderr, " revocation: %s",
1590: t != -1 ? ctime(&t) : "\n");
1591: break;
1592: case -1:
1593: break;
1594: default:
1.165 beck 1595: fprintf(stderr, "OCSP Stapling: failure - response_status %d (%s)\n",
1.164 beck 1596: tls_peer_ocsp_response_status(tls_ctx),
1597: tls_peer_ocsp_result(tls_ctx) == NULL ? "" :
1598: tls_peer_ocsp_result(tls_ctx));
1599: break;
1600:
1601: }
1.133 beck 1602: }
1.147 beck 1603:
1.108 haesbaer 1604: void
1.151 beck 1605: report_connect(const struct sockaddr *sa, socklen_t salen, char *path)
1.108 haesbaer 1606: {
1607: char remote_host[NI_MAXHOST];
1608: char remote_port[NI_MAXSERV];
1609: int herr;
1610: int flags = NI_NUMERICSERV;
1.151 beck 1611:
1612: if (path != NULL) {
1613: fprintf(stderr, "Connection on %s received!\n", path);
1614: return;
1615: }
1.134 deraadt 1616:
1.108 haesbaer 1617: if (nflag)
1618: flags |= NI_NUMERICHOST;
1.134 deraadt 1619:
1.108 haesbaer 1620: if ((herr = getnameinfo(sa, salen,
1621: remote_host, sizeof(remote_host),
1622: remote_port, sizeof(remote_port),
1623: flags)) != 0) {
1624: if (herr == EAI_SYSTEM)
1625: err(1, "getnameinfo");
1626: else
1627: errx(1, "getnameinfo: %s", gai_strerror(herr));
1628: }
1.134 deraadt 1629:
1.108 haesbaer 1630: fprintf(stderr,
1631: "Connection from %s %s "
1632: "received!\n", remote_host, remote_port);
1.7 deraadt 1633: }
1.1 deraadt 1634:
1.11 ericj 1635: void
1.58 deraadt 1636: help(void)
1.1 deraadt 1637: {
1.21 ericj 1638: usage(0);
1639: fprintf(stderr, "\tCommand Summary:\n\
1640: \t-4 Use IPv4\n\
1641: \t-6 Use IPv6\n\
1.135 jmc 1642: \t-C certfile Public key file\n\
1643: \t-c Use TLS\n\
1.73 markus 1644: \t-D Enable the debug socket option\n\
1.69 tedu 1645: \t-d Detach from stdin\n\
1.135 jmc 1646: \t-e name\t Required name in peer certificate\n\
1.114 jmc 1647: \t-F Pass socket fd\n\
1.135 jmc 1648: \t-H hash\t Hash string of peer certificate\n\
1.21 ericj 1649: \t-h This help text\n\
1.90 djm 1650: \t-I length TCP receive buffer length\n\
1.135 jmc 1651: \t-i interval Delay interval for lines sent, ports scanned\n\
1652: \t-K keyfile Private key file\n\
1.21 ericj 1653: \t-k Keep inbound sockets open for multiple connects\n\
1654: \t-l Listen mode, for inbound connects\n\
1.156 jca 1655: \t-M ttl Outgoing TTL / Hop Limit\n\
1656: \t-m minttl Minimum incoming TTL / Hop Limit\n\
1.111 sthen 1657: \t-N Shutdown the network socket after EOF on stdin\n\
1.22 jasoni 1658: \t-n Suppress name/port resolutions\n\
1.90 djm 1659: \t-O length TCP send buffer length\n\
1.169 jmc 1660: \t-o staplefile Staple file\n\
1.86 djm 1661: \t-P proxyuser\tUsername for proxy authentication\n\
1.36 jakob 1662: \t-p port\t Specify local port for remote connects\n\
1.135 jmc 1663: \t-R CAfile CA bundle\n\
1.21 ericj 1664: \t-r Randomize remote ports\n\
1.67 jmc 1665: \t-S Enable the TCP MD5 signature option\n\
1.135 jmc 1666: \t-s source Local source address\n\
1667: \t-T keyword TOS value or TLS options\n\
1.21 ericj 1668: \t-t Answer TELNET negotiation\n\
1.67 jmc 1669: \t-U Use UNIX domain socket\n\
1.21 ericj 1670: \t-u UDP mode\n\
1.98 guenther 1671: \t-V rtable Specify alternate routing table\n\
1.21 ericj 1672: \t-v Verbose\n\
1.135 jmc 1673: \t-w timeout Timeout for connects and final net reads\n\
1.75 djm 1674: \t-X proto Proxy protocol: \"4\", \"5\" (SOCKS) or \"connect\"\n\
1675: \t-x addr[:port]\tSpecify proxy address and port\n\
1.21 ericj 1676: \t-z Zero-I/O mode [used for scanning]\n\
1677: Port numbers can be individual or ranges: lo-hi [inclusive]\n");
1678: exit(1);
1.11 ericj 1679: }
1680:
1681: void
1.37 jakob 1682: usage(int ret)
1.11 ericj 1683: {
1.92 sobrado 1684: fprintf(stderr,
1.135 jmc 1685: "usage: nc [-46cDdFhklNnrStUuvz] [-C certfile] [-e name] "
1686: "[-H hash] [-I length]\n"
1.156 jca 1687: "\t [-i interval] [-K keyfile] [-M ttl] [-m minttl] [-O length]\n"
1.169 jmc 1688: "\t [-o staplefile] [-P proxy_username] [-p source_port] "
1689: "[-R CAfile]\n"
1690: "\t [-s source] [-T keyword] [-V rtable] [-w timeout] "
1691: "[-X proxy_protocol]\n"
1.156 jca 1692: "\t [-x proxy_address[:port]] [destination] [port]\n");
1.21 ericj 1693: if (ret)
1694: exit(1);
1.7 deraadt 1695: }
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