Annotation of src/usr.bin/nc/netcat.c, Revision 1.176
1.176 ! jca 1: /* $OpenBSD: netcat.c,v 1.175 2017/02/08 18:44:50 bluhm 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);
1.175 bluhm 124: int timeout_tls(int, struct tls *, int (*)(struct tls *));
1.103 fgsch 125: int timeout_connect(int, const struct sockaddr *, socklen_t);
1.86 djm 126: int socks_connect(const char *, const char *, struct addrinfo,
127: const char *, const char *, struct addrinfo, int, const char *);
1.40 millert 128: int udptest(int);
1.136 deraadt 129: int unix_bind(char *, int);
1.42 ericj 130: int unix_connect(char *);
131: int unix_listen(char *);
1.127 jca 132: void set_common_sockopts(int, int);
1.102 haesbaer 133: int map_tos(char *, int *);
1.133 beck 134: int map_tls(char *, int *);
1.151 beck 135: void report_connect(const struct sockaddr *, socklen_t, char *);
1.134 deraadt 136: void report_tls(struct tls *tls_ctx, char * host, char *tls_expectname);
1.40 millert 137: void usage(int);
1.133 beck 138: ssize_t drainbuf(int, unsigned char *, size_t *, struct tls *);
139: ssize_t fillbuf(int, unsigned char *, size_t *, struct tls *);
140: void tls_setup_client(struct tls *, int, char *);
1.134 deraadt 141: struct tls *tls_setup_server(struct tls *, int, char *);
1.1 deraadt 142:
1.21 ericj 143: int
1.37 jakob 144: main(int argc, char *argv[])
1.21 ericj 145: {
1.154 deraadt 146: int ch, s = -1, ret, socksv;
1.88 ray 147: char *host, *uport;
1.21 ericj 148: struct addrinfo hints;
1.29 smart 149: struct servent *sv;
1.21 ericj 150: socklen_t len;
1.76 hshoexer 151: struct sockaddr_storage cliaddr;
1.172 jca 152: char *proxy, *proxyport = NULL;
153: const char *errstr;
1.34 jakob 154: struct addrinfo proxyhints;
1.99 jeremy 155: char unix_dg_tmp_socket_buf[UNIX_DG_TMP_SOCKET_SIZE];
1.133 beck 156: struct tls_config *tls_cfg = NULL;
157: struct tls *tls_ctx = NULL;
1.11 ericj 158:
1.29 smart 159: ret = 1;
1.46 markus 160: socksv = 5;
1.29 smart 161: host = NULL;
162: uport = NULL;
163: sv = NULL;
1.129 tobias 164:
165: signal(SIGPIPE, SIG_IGN);
1.29 smart 166:
1.80 mcbride 167: while ((ch = getopt(argc, argv,
1.168 beck 168: "46C:cDde:FH:hI:i:K:klM:m:NnO:o:P:p:R:rSs:T:tUuV:vw:X:x:z")) != -1) {
1.21 ericj 169: switch (ch) {
170: case '4':
171: family = AF_INET;
172: break;
173: case '6':
174: family = AF_INET6;
175: break;
1.42 ericj 176: case 'U':
177: family = AF_UNIX;
178: break;
1.46 markus 179: case 'X':
1.75 djm 180: if (strcasecmp(optarg, "connect") == 0)
181: socksv = -1; /* HTTP proxy CONNECT */
182: else if (strcmp(optarg, "4") == 0)
183: socksv = 4; /* SOCKS v.4 */
184: else if (strcmp(optarg, "5") == 0)
185: socksv = 5; /* SOCKS v.5 */
186: else
187: errx(1, "unsupported proxy protocol");
1.46 markus 188: break;
1.133 beck 189: case 'C':
190: Cflag = optarg;
191: break;
192: case 'c':
193: usetls = 1;
194: break;
1.68 tedu 195: case 'd':
196: dflag = 1;
197: break;
1.133 beck 198: case 'e':
199: tls_expectname = optarg;
200: break;
1.113 djm 201: case 'F':
202: Fflag = 1;
203: break;
1.133 beck 204: case 'H':
205: tls_expecthash = optarg;
206: break;
1.21 ericj 207: case 'h':
208: help();
209: break;
210: case 'i':
1.88 ray 211: iflag = strtonum(optarg, 0, UINT_MAX, &errstr);
212: if (errstr)
213: errx(1, "interval %s: %s", errstr, optarg);
1.21 ericj 214: break;
1.133 beck 215: case 'K':
216: Kflag = optarg;
217: break;
1.21 ericj 218: case 'k':
219: kflag = 1;
220: break;
221: case 'l':
222: lflag = 1;
223: break;
1.156 jca 224: case 'M':
225: ttl = strtonum(optarg, 0, 255, &errstr);
226: if (errstr)
227: errx(1, "ttl is %s", errstr);
228: break;
229: case 'm':
230: minttl = strtonum(optarg, 0, 255, &errstr);
231: if (errstr)
232: errx(1, "minttl is %s", errstr);
233: break;
1.111 sthen 234: case 'N':
235: Nflag = 1;
236: break;
1.21 ericj 237: case 'n':
238: nflag = 1;
239: break;
1.86 djm 240: case 'P':
241: Pflag = optarg;
242: break;
1.21 ericj 243: case 'p':
244: pflag = optarg;
245: break;
1.133 beck 246: case 'R':
247: tls_cachanged = 1;
248: Rflag = optarg;
249: break;
1.21 ericj 250: case 'r':
251: rflag = 1;
252: break;
253: case 's':
254: sflag = optarg;
255: break;
256: case 't':
257: tflag = 1;
258: break;
259: case 'u':
260: uflag = 1;
261: break;
1.93 claudio 262: case 'V':
1.117 sthen 263: rtableid = (int)strtonum(optarg, 0,
1.93 claudio 264: RT_TABLEID_MAX, &errstr);
265: if (errstr)
1.98 guenther 266: errx(1, "rtable %s: %s", errstr, optarg);
1.93 claudio 267: break;
1.21 ericj 268: case 'v':
269: vflag = 1;
270: break;
1.70 deraadt 271: case 'w':
1.88 ray 272: timeout = strtonum(optarg, 0, INT_MAX / 1000, &errstr);
273: if (errstr)
274: errx(1, "timeout %s: %s", errstr, optarg);
1.49 hugh 275: timeout *= 1000;
1.21 ericj 276: break;
1.34 jakob 277: case 'x':
278: xflag = 1;
1.64 deraadt 279: if ((proxy = strdup(optarg)) == NULL)
280: err(1, NULL);
1.34 jakob 281: break;
1.21 ericj 282: case 'z':
283: zflag = 1;
284: break;
1.73 markus 285: case 'D':
286: Dflag = 1;
287: break;
1.90 djm 288: case 'I':
289: Iflag = strtonum(optarg, 1, 65536 << 14, &errstr);
290: if (errstr != NULL)
291: errx(1, "TCP receive window %s: %s",
292: errstr, optarg);
293: break;
294: case 'O':
295: Oflag = strtonum(optarg, 1, 65536 << 14, &errstr);
296: if (errstr != NULL)
297: errx(1, "TCP send window %s: %s",
298: errstr, optarg);
299: break;
1.168 beck 300: case 'o':
301: oflag = optarg;
302: break;
1.65 markus 303: case 'S':
304: Sflag = 1;
305: break;
1.83 dtucker 306: case 'T':
1.102 haesbaer 307: errstr = NULL;
308: errno = 0;
309: if (map_tos(optarg, &Tflag))
310: break;
1.133 beck 311: if (map_tls(optarg, &TLSopt))
312: break;
1.102 haesbaer 313: if (strlen(optarg) > 1 && optarg[0] == '0' &&
314: optarg[1] == 'x')
315: Tflag = (int)strtol(optarg, NULL, 16);
316: else
317: Tflag = (int)strtonum(optarg, 0, 255,
318: &errstr);
319: if (Tflag < 0 || Tflag > 255 || errstr || errno)
1.133 beck 320: errx(1, "illegal tos/tls value %s", optarg);
1.83 dtucker 321: break;
1.21 ericj 322: default:
323: usage(1);
324: }
325: }
326: argc -= optind;
327: argv += optind;
1.11 ericj 328:
1.143 deraadt 329: if (rtableid >= 0)
1.142 benno 330: if (setrtable(rtableid) == -1)
331: err(1, "setrtable");
1.143 deraadt 332:
1.142 benno 333: if (family == AF_UNIX) {
1.140 beck 334: if (pledge("stdio rpath wpath cpath tmppath unix", NULL) == -1)
335: err(1, "pledge");
1.143 deraadt 336: } else if (Fflag) {
1.152 beck 337: if (Pflag) {
338: if (pledge("stdio inet dns sendfd tty", NULL) == -1)
339: err(1, "pledge");
340: } else if (pledge("stdio inet dns sendfd", NULL) == -1)
341: err(1, "pledge");
342: } else if (Pflag) {
343: if (pledge("stdio inet dns tty", NULL) == -1)
1.140 beck 344: err(1, "pledge");
1.143 deraadt 345: } else if (usetls) {
1.140 beck 346: if (pledge("stdio rpath inet dns", NULL) == -1)
347: err(1, "pledge");
1.143 deraadt 348: } else if (pledge("stdio inet dns", NULL) == -1)
1.140 beck 349: err(1, "pledge");
350:
1.21 ericj 351: /* Cruft to make sure options are clean, and used properly. */
1.42 ericj 352: if (argv[0] && !argv[1] && family == AF_UNIX) {
353: host = argv[0];
354: uport = NULL;
355: } else if (argv[0] && !argv[1]) {
1.21 ericj 356: if (!lflag)
357: usage(1);
358: uport = argv[0];
359: host = NULL;
360: } else if (argv[0] && argv[1]) {
361: host = argv[0];
362: uport = argv[1];
363: } else
364: usage(1);
1.1 deraadt 365:
1.21 ericj 366: if (lflag && sflag)
367: errx(1, "cannot use -s and -l");
368: if (lflag && pflag)
369: errx(1, "cannot use -p and -l");
370: if (lflag && zflag)
1.32 ericj 371: errx(1, "cannot use -z and -l");
1.21 ericj 372: if (!lflag && kflag)
1.32 ericj 373: errx(1, "must use -l with -k");
1.133 beck 374: if (uflag && usetls)
375: errx(1, "cannot use -c and -u");
376: if ((family == AF_UNIX) && usetls)
377: errx(1, "cannot use -c and -U");
1.140 beck 378: if ((family == AF_UNIX) && Fflag)
379: errx(1, "cannot use -F and -U");
380: if (Fflag && usetls)
381: errx(1, "cannot use -c and -F");
1.133 beck 382: if (TLSopt && !usetls)
383: errx(1, "you must specify -c to use TLS options");
384: if (Cflag && !usetls)
385: errx(1, "you must specify -c to use -C");
386: if (Kflag && !usetls)
387: errx(1, "you must specify -c to use -K");
1.168 beck 388: if (oflag && !Cflag)
389: errx(1, "you must specify -C to use -o");
1.133 beck 390: if (tls_cachanged && !usetls)
391: errx(1, "you must specify -c to use -R");
392: if (tls_expecthash && !usetls)
393: errx(1, "you must specify -c to use -H");
394: if (tls_expectname && !usetls)
395: errx(1, "you must specify -c to use -e");
1.21 ericj 396:
1.99 jeremy 397: /* Get name of temporary socket for unix datagram client */
398: if ((family == AF_UNIX) && uflag && !lflag) {
399: if (sflag) {
400: unix_dg_tmp_socket = sflag;
401: } else {
402: strlcpy(unix_dg_tmp_socket_buf, "/tmp/nc.XXXXXXXXXX",
1.136 deraadt 403: UNIX_DG_TMP_SOCKET_SIZE);
1.99 jeremy 404: if (mktemp(unix_dg_tmp_socket_buf) == NULL)
405: err(1, "mktemp");
406: unix_dg_tmp_socket = unix_dg_tmp_socket_buf;
407: }
408: }
409:
1.67 jmc 410: /* Initialize addrinfo structure. */
1.42 ericj 411: if (family != AF_UNIX) {
412: memset(&hints, 0, sizeof(struct addrinfo));
413: hints.ai_family = family;
414: hints.ai_socktype = uflag ? SOCK_DGRAM : SOCK_STREAM;
415: hints.ai_protocol = uflag ? IPPROTO_UDP : IPPROTO_TCP;
416: if (nflag)
417: hints.ai_flags |= AI_NUMERICHOST;
418: }
1.1 deraadt 419:
1.34 jakob 420: if (xflag) {
421: if (uflag)
422: errx(1, "no proxy support for UDP mode");
423:
424: if (lflag)
425: errx(1, "no proxy support for listen");
426:
1.42 ericj 427: if (family == AF_UNIX)
428: errx(1, "no proxy support for unix sockets");
429:
1.34 jakob 430: if (sflag)
431: errx(1, "no proxy support for local source address");
432:
1.172 jca 433: if (*proxy == '[') {
434: ++proxy;
435: proxyport = strchr(proxy, ']');
436: if (proxyport == NULL)
437: errx(1, "missing closing bracket in proxy");
438: *proxyport++ = '\0';
439: if (*proxyport == '\0')
440: /* Use default proxy port. */
441: proxyport = NULL;
442: else {
443: if (*proxyport == ':')
444: ++proxyport;
445: else
446: errx(1, "garbage proxy port delimiter");
447: }
448: } else {
449: proxyport = strrchr(proxy, ':');
450: if (proxyport != NULL)
451: *proxyport++ = '\0';
452: }
1.34 jakob 453:
454: memset(&proxyhints, 0, sizeof(struct addrinfo));
455: proxyhints.ai_family = family;
456: proxyhints.ai_socktype = SOCK_STREAM;
457: proxyhints.ai_protocol = IPPROTO_TCP;
458: if (nflag)
459: proxyhints.ai_flags |= AI_NUMERICHOST;
460: }
461:
1.133 beck 462: if (usetls) {
1.152 beck 463: if (Pflag) {
1.162 jsing 464: if (pledge("stdio inet dns tty rpath", NULL) == -1)
1.152 beck 465: err(1, "pledge");
1.162 jsing 466: } else if (pledge("stdio inet dns rpath", NULL) == -1)
1.146 beck 467: err(1, "pledge");
468:
1.133 beck 469: if (tls_init() == -1)
470: errx(1, "unable to initialize TLS");
471: if ((tls_cfg = tls_config_new()) == NULL)
472: errx(1, "unable to allocate TLS config");
1.162 jsing 473: if (Rflag && tls_config_set_ca_file(tls_cfg, Rflag) == -1)
474: errx(1, "%s", tls_config_error(tls_cfg));
475: if (Cflag && tls_config_set_cert_file(tls_cfg, Cflag) == -1)
476: errx(1, "%s", tls_config_error(tls_cfg));
477: if (Kflag && tls_config_set_key_file(tls_cfg, Kflag) == -1)
1.168 beck 478: errx(1, "%s", tls_config_error(tls_cfg));
479: if (oflag && tls_config_set_ocsp_staple_file(tls_cfg, oflag) == -1)
1.162 jsing 480: errx(1, "%s", tls_config_error(tls_cfg));
1.170 beck 481: if (TLSopt & TLS_ALL) {
1.171 mestre 482: if (tls_config_set_protocols(tls_cfg,
483: TLS_PROTOCOLS_ALL) != 0)
484: errx(1, "%s", tls_config_error(tls_cfg));
485: if (tls_config_set_ciphers(tls_cfg, "all") != 0)
486: errx(1, "%s", tls_config_error(tls_cfg));
1.133 beck 487: }
488: if (!lflag && (TLSopt & TLS_CCERT))
489: errx(1, "clientcert is only valid with -l");
490: if (TLSopt & TLS_NONAME)
491: tls_config_insecure_noverifyname(tls_cfg);
492: if (TLSopt & TLS_NOVERIFY) {
493: if (tls_expecthash != NULL)
494: errx(1, "-H and -T noverify may not be used"
495: "together");
496: tls_config_insecure_noverifycert(tls_cfg);
497: }
1.167 beck 498: if (TLSopt & TLS_MUSTSTAPLE)
499: tls_config_ocsp_require_stapling(tls_cfg);
1.162 jsing 500:
501: if (Pflag) {
502: if (pledge("stdio inet dns tty", NULL) == -1)
503: err(1, "pledge");
504: } else if (pledge("stdio inet dns", NULL) == -1)
505: err(1, "pledge");
1.133 beck 506: }
1.21 ericj 507: if (lflag) {
1.133 beck 508: struct tls *tls_cctx = NULL;
1.21 ericj 509: int connfd;
1.27 ericj 510: ret = 0;
1.1 deraadt 511:
1.99 jeremy 512: if (family == AF_UNIX) {
513: if (uflag)
1.136 deraadt 514: s = unix_bind(host, 0);
1.99 jeremy 515: else
516: s = unix_listen(host);
517: }
1.42 ericj 518:
1.133 beck 519: if (usetls) {
520: tls_config_verify_client_optional(tls_cfg);
521: if ((tls_ctx = tls_server()) == NULL)
522: errx(1, "tls server creation failed");
523: if (tls_configure(tls_ctx, tls_cfg) == -1)
524: errx(1, "tls configuration failed (%s)",
525: tls_error(tls_ctx));
526: }
1.67 jmc 527: /* Allow only one connection at a time, but stay alive. */
1.21 ericj 528: for (;;) {
1.42 ericj 529: if (family != AF_UNIX)
530: s = local_listen(host, uport, hints);
531: if (s < 0)
1.30 smart 532: err(1, NULL);
1.21 ericj 533: /*
1.109 haesbaer 534: * For UDP and -k, don't connect the socket, let it
535: * receive datagrams from multiple socket pairs.
1.21 ericj 536: */
1.109 haesbaer 537: if (uflag && kflag)
1.133 beck 538: readwrite(s, NULL);
1.109 haesbaer 539: /*
540: * For UDP and not -k, we will use recvfrom() initially
541: * to wait for a caller, then use the regular functions
542: * to talk to the caller.
543: */
544: else if (uflag && !kflag) {
1.80 mcbride 545: int rv, plen;
1.97 nicm 546: char buf[16384];
1.21 ericj 547: struct sockaddr_storage z;
548:
549: len = sizeof(z);
1.106 dlg 550: plen = 2048;
1.80 mcbride 551: rv = recvfrom(s, buf, plen, MSG_PEEK,
1.37 jakob 552: (struct sockaddr *)&z, &len);
1.23 ericj 553: if (rv < 0)
1.57 stevesk 554: err(1, "recvfrom");
1.21 ericj 555:
1.37 jakob 556: rv = connect(s, (struct sockaddr *)&z, len);
1.23 ericj 557: if (rv < 0)
1.57 stevesk 558: err(1, "connect");
1.1 deraadt 559:
1.108 haesbaer 560: if (vflag)
1.151 beck 561: report_connect((struct sockaddr *)&z, len, NULL);
1.108 haesbaer 562:
1.133 beck 563: readwrite(s, NULL);
1.21 ericj 564: } else {
1.78 otto 565: len = sizeof(cliaddr);
1.132 bluhm 566: connfd = accept4(s, (struct sockaddr *)&cliaddr,
567: &len, SOCK_NONBLOCK);
1.110 deraadt 568: if (connfd == -1) {
569: /* For now, all errnos are fatal */
1.125 tedu 570: err(1, "accept");
1.110 deraadt 571: }
1.108 haesbaer 572: if (vflag)
1.151 beck 573: report_connect((struct sockaddr *)&cliaddr, len,
574: family == AF_UNIX ? host : NULL);
1.133 beck 575: if ((usetls) &&
1.134 deraadt 576: (tls_cctx = tls_setup_server(tls_ctx, connfd, host)))
1.133 beck 577: readwrite(connfd, tls_cctx);
578: if (!usetls)
579: readwrite(connfd, NULL);
580: if (tls_cctx) {
1.175 bluhm 581: timeout_tls(s, tls_cctx, tls_close);
1.133 beck 582: tls_free(tls_cctx);
583: tls_cctx = NULL;
584: }
1.99 jeremy 585: close(connfd);
1.21 ericj 586: }
1.42 ericj 587: if (family != AF_UNIX)
588: close(s);
1.99 jeremy 589: else if (uflag) {
590: if (connect(s, NULL, 0) < 0)
591: err(1, "connect");
592: }
1.27 ericj 593:
1.21 ericj 594: if (!kflag)
595: break;
1.11 ericj 596: }
1.42 ericj 597: } else if (family == AF_UNIX) {
598: ret = 0;
599:
600: if ((s = unix_connect(host)) > 0 && !zflag) {
1.133 beck 601: readwrite(s, NULL);
1.42 ericj 602: close(s);
603: } else
604: ret = 1;
605:
1.99 jeremy 606: if (uflag)
607: unlink(unix_dg_tmp_socket);
1.42 ericj 608: exit(ret);
609:
1.21 ericj 610: } else {
611: int i = 0;
1.6 deraadt 612:
1.67 jmc 613: /* Construct the portlist[] array. */
1.21 ericj 614: build_ports(uport);
1.1 deraadt 615:
1.67 jmc 616: /* Cycle through portlist, connecting to each port. */
1.154 deraadt 617: for (s = -1, i = 0; portlist[i] != NULL; i++) {
618: if (s != -1)
1.21 ericj 619: close(s);
1.34 jakob 620:
1.133 beck 621: if (usetls) {
622: if ((tls_ctx = tls_client()) == NULL)
623: errx(1, "tls client creation failed");
624: if (tls_configure(tls_ctx, tls_cfg) == -1)
625: errx(1, "tls configuration failed (%s)",
626: tls_error(tls_ctx));
627: }
1.34 jakob 628: if (xflag)
629: s = socks_connect(host, portlist[i], hints,
1.172 jca 630: proxy, proxyport, proxyhints, socksv,
1.86 djm 631: Pflag);
1.34 jakob 632: else
633: s = remote_connect(host, portlist[i], hints);
634:
1.154 deraadt 635: if (s == -1)
1.21 ericj 636: continue;
1.1 deraadt 637:
1.21 ericj 638: ret = 0;
639: if (vflag || zflag) {
1.67 jmc 640: /* For UDP, make sure we are connected. */
1.21 ericj 641: if (uflag) {
1.50 vincent 642: if (udptest(s) == -1) {
1.21 ericj 643: ret = 1;
644: continue;
645: }
646: }
1.1 deraadt 647:
1.67 jmc 648: /* Don't look up port if -n. */
1.21 ericj 649: if (nflag)
650: sv = NULL;
651: else {
652: sv = getservbyport(
1.37 jakob 653: ntohs(atoi(portlist[i])),
654: uflag ? "udp" : "tcp");
1.21 ericj 655: }
1.50 vincent 656:
1.94 mpf 657: fprintf(stderr,
658: "Connection to %s %s port [%s/%s] "
659: "succeeded!\n", host, portlist[i],
660: uflag ? "udp" : "tcp",
1.37 jakob 661: sv ? sv->s_name : "*");
1.21 ericj 662: }
1.113 djm 663: if (Fflag)
664: fdpass(s);
1.133 beck 665: else {
666: if (usetls)
667: tls_setup_client(tls_ctx, s, host);
668: if (!zflag)
669: readwrite(s, tls_ctx);
670: if (tls_ctx) {
1.175 bluhm 671: timeout_tls(s, tls_ctx, tls_close);
1.133 beck 672: tls_free(tls_ctx);
673: tls_ctx = NULL;
674: }
675: }
1.7 deraadt 676: }
1.11 ericj 677: }
1.1 deraadt 678:
1.154 deraadt 679: if (s != -1)
1.21 ericj 680: close(s);
681:
1.133 beck 682: tls_config_free(tls_cfg);
683:
1.21 ericj 684: exit(ret);
1.7 deraadt 685: }
1.1 deraadt 686:
1.11 ericj 687: /*
1.99 jeremy 688: * unix_bind()
689: * Returns a unix socket bound to the given path
1.42 ericj 690: */
691: int
1.136 deraadt 692: unix_bind(char *path, int flags)
1.42 ericj 693: {
1.144 bcook 694: struct sockaddr_un s_un;
1.155 deraadt 695: int s, save_errno;
1.42 ericj 696:
1.99 jeremy 697: /* Create unix domain socket. */
1.136 deraadt 698: if ((s = socket(AF_UNIX, flags | (uflag ? SOCK_DGRAM : SOCK_STREAM),
699: 0)) < 0)
1.50 vincent 700: return (-1);
1.42 ericj 701:
1.144 bcook 702: memset(&s_un, 0, sizeof(struct sockaddr_un));
703: s_un.sun_family = AF_UNIX;
1.60 avsm 704:
1.144 bcook 705: if (strlcpy(s_un.sun_path, path, sizeof(s_un.sun_path)) >=
706: sizeof(s_un.sun_path)) {
1.60 avsm 707: close(s);
708: errno = ENAMETOOLONG;
709: return (-1);
710: }
1.99 jeremy 711:
1.144 bcook 712: if (bind(s, (struct sockaddr *)&s_un, sizeof(s_un)) < 0) {
1.155 deraadt 713: save_errno = errno;
1.50 vincent 714: close(s);
1.155 deraadt 715: errno = save_errno;
1.50 vincent 716: return (-1);
1.42 ericj 717: }
718: return (s);
719: }
720:
1.173 bluhm 721: int
1.175 bluhm 722: timeout_tls(int s, struct tls *tls_ctx, int (*func)(struct tls *))
1.173 bluhm 723: {
724: struct pollfd pfd;
725: int ret;
726:
1.175 bluhm 727: while ((ret = (*func)(tls_ctx)) != 0) {
1.173 bluhm 728: if (ret == TLS_WANT_POLLIN)
729: pfd.events = POLLIN;
730: else if (ret == TLS_WANT_POLLOUT)
731: pfd.events = POLLOUT;
732: else
733: break;
734: pfd.fd = s;
735: if ((ret = poll(&pfd, 1, timeout)) == 1)
736: continue;
737: else if (ret == 0) {
738: errno = ETIMEDOUT;
739: ret = -1;
740: break;
741: } else
742: err(1, "poll failed");
743: }
744:
745: return (ret);
746: }
747:
1.133 beck 748: void
749: tls_setup_client(struct tls *tls_ctx, int s, char *host)
750: {
1.173 bluhm 751: const char *errstr;
1.136 deraadt 752:
1.133 beck 753: if (tls_connect_socket(tls_ctx, s,
754: tls_expectname ? tls_expectname : host) == -1) {
755: errx(1, "tls connection failed (%s)",
756: tls_error(tls_ctx));
757: }
1.175 bluhm 758: if (timeout_tls(s, tls_ctx, tls_handshake) == -1) {
1.173 bluhm 759: if ((errstr = tls_error(tls_ctx)) == NULL)
760: errstr = strerror(errno);
761: errx(1, "tls handshake failed (%s)", errstr);
762: }
1.133 beck 763: if (vflag)
764: report_tls(tls_ctx, host, tls_expectname);
1.137 beck 765: if (tls_expecthash && tls_peer_cert_hash(tls_ctx) &&
766: strcmp(tls_expecthash, tls_peer_cert_hash(tls_ctx)) != 0)
1.133 beck 767: errx(1, "peer certificate is not %s", tls_expecthash);
768: }
1.141 deraadt 769:
1.133 beck 770: struct tls *
771: tls_setup_server(struct tls *tls_ctx, int connfd, char *host)
772: {
773: struct tls *tls_cctx;
1.173 bluhm 774: const char *errstr;
1.136 deraadt 775:
1.173 bluhm 776: if (tls_accept_socket(tls_ctx, &tls_cctx, connfd) == -1) {
777: warnx("tls accept failed (%s)", tls_error(tls_ctx));
1.175 bluhm 778: } else if (timeout_tls(connfd, tls_cctx, tls_handshake) == -1) {
1.173 bluhm 779: if ((errstr = tls_error(tls_ctx)) == NULL)
780: errstr = strerror(errno);
781: warnx("tls handshake failed (%s)", errstr);
1.133 beck 782: } else {
783: int gotcert = tls_peer_cert_provided(tls_cctx);
1.136 deraadt 784:
1.133 beck 785: if (vflag && gotcert)
786: report_tls(tls_cctx, host, tls_expectname);
787: if ((TLSopt & TLS_CCERT) && !gotcert)
788: warnx("No client certificate provided");
1.137 beck 789: else if (gotcert && tls_peer_cert_hash(tls_ctx) && tls_expecthash &&
790: strcmp(tls_expecthash, tls_peer_cert_hash(tls_ctx)) != 0)
1.133 beck 791: warnx("peer certificate is not %s", tls_expecthash);
792: else if (gotcert && tls_expectname &&
1.134 deraadt 793: (!tls_peer_cert_contains_name(tls_cctx, tls_expectname)))
1.133 beck 794: warnx("name (%s) not found in client cert",
795: tls_expectname);
796: else {
797: return tls_cctx;
798: }
799: }
800: return NULL;
801: }
1.141 deraadt 802:
1.42 ericj 803: /*
1.99 jeremy 804: * unix_connect()
805: * Returns a socket connected to a local unix socket. Returns -1 on failure.
1.42 ericj 806: */
807: int
1.99 jeremy 808: unix_connect(char *path)
1.42 ericj 809: {
1.144 bcook 810: struct sockaddr_un s_un;
1.155 deraadt 811: int s, save_errno;
1.42 ericj 812:
1.99 jeremy 813: if (uflag) {
1.136 deraadt 814: if ((s = unix_bind(unix_dg_tmp_socket, SOCK_CLOEXEC)) < 0)
1.99 jeremy 815: return (-1);
816: } else {
1.136 deraadt 817: if ((s = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0)) < 0)
1.99 jeremy 818: return (-1);
819: }
1.42 ericj 820:
1.144 bcook 821: memset(&s_un, 0, sizeof(struct sockaddr_un));
822: s_un.sun_family = AF_UNIX;
1.60 avsm 823:
1.144 bcook 824: if (strlcpy(s_un.sun_path, path, sizeof(s_un.sun_path)) >=
825: sizeof(s_un.sun_path)) {
1.60 avsm 826: close(s);
827: errno = ENAMETOOLONG;
828: return (-1);
829: }
1.144 bcook 830: if (connect(s, (struct sockaddr *)&s_un, sizeof(s_un)) < 0) {
1.155 deraadt 831: save_errno = errno;
1.42 ericj 832: close(s);
1.155 deraadt 833: errno = save_errno;
1.42 ericj 834: return (-1);
835: }
1.99 jeremy 836: return (s);
837:
838: }
839:
840: /*
841: * unix_listen()
842: * Create a unix domain socket, and listen on it.
843: */
844: int
845: unix_listen(char *path)
846: {
847: int s;
1.136 deraadt 848: if ((s = unix_bind(path, 0)) < 0)
1.99 jeremy 849: return (-1);
1.42 ericj 850:
851: if (listen(s, 5) < 0) {
852: close(s);
853: return (-1);
854: }
855: return (s);
856: }
857:
858: /*
1.21 ericj 859: * remote_connect()
1.67 jmc 860: * Returns a socket connected to a remote host. Properly binds to a local
861: * port or source address if needed. Returns -1 on failure.
1.11 ericj 862: */
1.21 ericj 863: int
1.77 otto 864: remote_connect(const char *host, const char *port, struct addrinfo hints)
1.21 ericj 865: {
866: struct addrinfo *res, *res0;
1.163 bcook 867: int s = -1, error, on = 1, save_errno;
1.21 ericj 868:
1.161 halex 869: if ((error = getaddrinfo(host, port, &hints, &res0)))
1.176 ! jca 870: errx(1, "getaddrinfo for host \"%s\" port %s: %s", host,
! 871: port, gai_strerror(error));
1.21 ericj 872:
1.161 halex 873: for (res = res0; res; res = res->ai_next) {
874: if ((s = socket(res->ai_family, res->ai_socktype |
875: SOCK_NONBLOCK, res->ai_protocol)) < 0)
1.21 ericj 876: continue;
877:
1.67 jmc 878: /* Bind to a local port or source address if specified. */
1.21 ericj 879: if (sflag || pflag) {
880: struct addrinfo ahints, *ares;
1.6 deraadt 881:
1.91 markus 882: /* try SO_BINDANY, but don't insist */
883: setsockopt(s, SOL_SOCKET, SO_BINDANY, &on, sizeof(on));
1.21 ericj 884: memset(&ahints, 0, sizeof(struct addrinfo));
1.161 halex 885: ahints.ai_family = res->ai_family;
1.21 ericj 886: ahints.ai_socktype = uflag ? SOCK_DGRAM : SOCK_STREAM;
887: ahints.ai_protocol = uflag ? IPPROTO_UDP : IPPROTO_TCP;
1.25 ericj 888: ahints.ai_flags = AI_PASSIVE;
1.38 jakob 889: if ((error = getaddrinfo(sflag, pflag, &ahints, &ares)))
1.56 stevesk 890: errx(1, "getaddrinfo: %s", gai_strerror(error));
1.21 ericj 891:
892: if (bind(s, (struct sockaddr *)ares->ai_addr,
1.62 millert 893: ares->ai_addrlen) < 0)
1.119 guenther 894: err(1, "bind failed");
1.21 ericj 895: freeaddrinfo(ares);
1.6 deraadt 896: }
1.81 marius 897:
1.161 halex 898: set_common_sockopts(s, res->ai_family);
1.6 deraadt 899:
1.161 halex 900: if (timeout_connect(s, res->ai_addr, res->ai_addrlen) == 0)
1.6 deraadt 901: break;
1.143 deraadt 902: if (vflag)
1.71 mcbride 903: warn("connect to %s port %s (%s) failed", host, port,
904: uflag ? "udp" : "tcp");
1.34 jakob 905:
1.155 deraadt 906: save_errno = errno;
1.21 ericj 907: close(s);
1.155 deraadt 908: errno = save_errno;
1.21 ericj 909: s = -1;
1.161 halex 910: }
1.21 ericj 911:
1.161 halex 912: freeaddrinfo(res0);
1.1 deraadt 913:
1.21 ericj 914: return (s);
1.103 fgsch 915: }
916:
917: int
918: timeout_connect(int s, const struct sockaddr *name, socklen_t namelen)
919: {
920: struct pollfd pfd;
921: socklen_t optlen;
1.132 bluhm 922: int optval;
1.103 fgsch 923: int ret;
924:
925: if ((ret = connect(s, name, namelen)) != 0 && errno == EINPROGRESS) {
926: pfd.fd = s;
927: pfd.events = POLLOUT;
928: if ((ret = poll(&pfd, 1, timeout)) == 1) {
929: optlen = sizeof(optval);
930: if ((ret = getsockopt(s, SOL_SOCKET, SO_ERROR,
931: &optval, &optlen)) == 0) {
932: errno = optval;
933: ret = optval == 0 ? 0 : -1;
934: }
935: } else if (ret == 0) {
936: errno = ETIMEDOUT;
937: ret = -1;
938: } else
939: err(1, "poll failed");
940: }
941:
942: return (ret);
1.7 deraadt 943: }
1.1 deraadt 944:
1.11 ericj 945: /*
1.21 ericj 946: * local_listen()
1.67 jmc 947: * Returns a socket listening on a local port, binds to specified source
948: * address. Returns -1 on failure.
1.11 ericj 949: */
1.21 ericj 950: int
1.37 jakob 951: local_listen(char *host, char *port, struct addrinfo hints)
1.21 ericj 952: {
953: struct addrinfo *res, *res0;
1.163 bcook 954: int s = -1, ret, x = 1, save_errno;
1.21 ericj 955: int error;
1.6 deraadt 956:
1.67 jmc 957: /* Allow nodename to be null. */
1.21 ericj 958: hints.ai_flags |= AI_PASSIVE;
1.7 deraadt 959:
1.21 ericj 960: /*
961: * In the case of binding to a wildcard address
962: * default to binding to an ipv4 address.
963: */
964: if (host == NULL && hints.ai_family == AF_UNSPEC)
965: hints.ai_family = AF_INET;
1.1 deraadt 966:
1.161 halex 967: if ((error = getaddrinfo(host, port, &hints, &res0)))
1.70 deraadt 968: errx(1, "getaddrinfo: %s", gai_strerror(error));
1.14 ericj 969:
1.161 halex 970: for (res = res0; res; res = res->ai_next) {
971: if ((s = socket(res->ai_family, res->ai_socktype,
972: res->ai_protocol)) < 0)
1.21 ericj 973: continue;
1.93 claudio 974:
1.21 ericj 975: ret = setsockopt(s, SOL_SOCKET, SO_REUSEPORT, &x, sizeof(x));
976: if (ret == -1)
1.30 smart 977: err(1, NULL);
1.81 marius 978:
1.161 halex 979: set_common_sockopts(s, res->ai_family);
1.1 deraadt 980:
1.161 halex 981: if (bind(s, (struct sockaddr *)res->ai_addr,
982: res->ai_addrlen) == 0)
1.21 ericj 983: break;
1.1 deraadt 984:
1.155 deraadt 985: save_errno = errno;
1.21 ericj 986: close(s);
1.155 deraadt 987: errno = save_errno;
1.21 ericj 988: s = -1;
1.161 halex 989: }
1.1 deraadt 990:
1.47 ericj 991: if (!uflag && s != -1) {
1.21 ericj 992: if (listen(s, 1) < 0)
1.57 stevesk 993: err(1, "listen");
1.12 ericj 994: }
1.1 deraadt 995:
1.161 halex 996: freeaddrinfo(res0);
1.1 deraadt 997:
1.21 ericj 998: return (s);
1.7 deraadt 999: }
1000:
1.11 ericj 1001: /*
1.21 ericj 1002: * readwrite()
1003: * Loop that polls on the network file descriptor and stdin.
1.11 ericj 1004: */
1.21 ericj 1005: void
1.133 beck 1006: readwrite(int net_fd, struct tls *tls_ctx)
1.6 deraadt 1007: {
1.125 tedu 1008: struct pollfd pfd[4];
1009: int stdin_fd = STDIN_FILENO;
1010: int stdout_fd = STDOUT_FILENO;
1011: unsigned char netinbuf[BUFSIZE];
1012: size_t netinbufpos = 0;
1013: unsigned char stdinbuf[BUFSIZE];
1014: size_t stdinbufpos = 0;
1.130 chl 1015: int n, num_fds;
1.125 tedu 1016: ssize_t ret;
1017:
1018: /* don't read from stdin if requested */
1019: if (dflag)
1020: stdin_fd = -1;
1021:
1022: /* stdin */
1023: pfd[POLL_STDIN].fd = stdin_fd;
1024: pfd[POLL_STDIN].events = POLLIN;
1025:
1026: /* network out */
1027: pfd[POLL_NETOUT].fd = net_fd;
1028: pfd[POLL_NETOUT].events = 0;
1029:
1030: /* network in */
1031: pfd[POLL_NETIN].fd = net_fd;
1032: pfd[POLL_NETIN].events = POLLIN;
1033:
1034: /* stdout */
1035: pfd[POLL_STDOUT].fd = stdout_fd;
1036: pfd[POLL_STDOUT].events = 0;
1037:
1038: while (1) {
1039: /* both inputs are gone, buffers are empty, we are done */
1.134 deraadt 1040: if (pfd[POLL_STDIN].fd == -1 && pfd[POLL_NETIN].fd == -1 &&
1.174 bluhm 1041: stdinbufpos == 0 && netinbufpos == 0)
1.125 tedu 1042: return;
1043: /* both outputs are gone, we can't continue */
1.174 bluhm 1044: if (pfd[POLL_NETOUT].fd == -1 && pfd[POLL_STDOUT].fd == -1)
1.125 tedu 1045: return;
1046: /* listen and net in gone, queues empty, done */
1.134 deraadt 1047: if (lflag && pfd[POLL_NETIN].fd == -1 &&
1.174 bluhm 1048: stdinbufpos == 0 && netinbufpos == 0)
1.125 tedu 1049: return;
1.21 ericj 1050:
1.125 tedu 1051: /* help says -i is for "wait between lines sent". We read and
1052: * write arbitrary amounts of data, and we don't want to start
1053: * scanning for newlines, so this is as good as it gets */
1.21 ericj 1054: if (iflag)
1055: sleep(iflag);
1056:
1.125 tedu 1057: /* poll */
1058: num_fds = poll(pfd, 4, timeout);
1059:
1060: /* treat poll errors */
1.174 bluhm 1061: if (num_fds == -1)
1.125 tedu 1062: err(1, "polling error");
1.49 hugh 1063:
1.125 tedu 1064: /* timeout happened */
1065: if (num_fds == 0)
1.49 hugh 1066: return;
1.21 ericj 1067:
1.125 tedu 1068: /* treat socket error conditions */
1069: for (n = 0; n < 4; n++) {
1070: if (pfd[n].revents & (POLLERR|POLLNVAL)) {
1071: pfd[n].fd = -1;
1.6 deraadt 1072: }
1.21 ericj 1073: }
1.125 tedu 1074: /* reading is possible after HUP */
1075: if (pfd[POLL_STDIN].events & POLLIN &&
1076: pfd[POLL_STDIN].revents & POLLHUP &&
1.134 deraadt 1077: !(pfd[POLL_STDIN].revents & POLLIN))
1078: pfd[POLL_STDIN].fd = -1;
1.125 tedu 1079:
1080: if (pfd[POLL_NETIN].events & POLLIN &&
1081: pfd[POLL_NETIN].revents & POLLHUP &&
1.134 deraadt 1082: !(pfd[POLL_NETIN].revents & POLLIN))
1083: pfd[POLL_NETIN].fd = -1;
1.125 tedu 1084:
1085: if (pfd[POLL_NETOUT].revents & POLLHUP) {
1086: if (Nflag)
1087: shutdown(pfd[POLL_NETOUT].fd, SHUT_WR);
1088: pfd[POLL_NETOUT].fd = -1;
1089: }
1090: /* if HUP, stop watching stdout */
1091: if (pfd[POLL_STDOUT].revents & POLLHUP)
1092: pfd[POLL_STDOUT].fd = -1;
1093: /* if no net out, stop watching stdin */
1094: if (pfd[POLL_NETOUT].fd == -1)
1095: pfd[POLL_STDIN].fd = -1;
1096: /* if no stdout, stop watching net in */
1097: if (pfd[POLL_STDOUT].fd == -1) {
1098: if (pfd[POLL_NETIN].fd != -1)
1099: shutdown(pfd[POLL_NETIN].fd, SHUT_RD);
1100: pfd[POLL_NETIN].fd = -1;
1101: }
1.21 ericj 1102:
1.125 tedu 1103: /* try to read from stdin */
1104: if (pfd[POLL_STDIN].revents & POLLIN && stdinbufpos < BUFSIZE) {
1105: ret = fillbuf(pfd[POLL_STDIN].fd, stdinbuf,
1.133 beck 1106: &stdinbufpos, NULL);
1107: if (ret == TLS_WANT_POLLIN)
1108: pfd[POLL_STDIN].events = POLLIN;
1109: else if (ret == TLS_WANT_POLLOUT)
1110: pfd[POLL_STDIN].events = POLLOUT;
1111: else if (ret == 0 || ret == -1)
1.125 tedu 1112: pfd[POLL_STDIN].fd = -1;
1113: /* read something - poll net out */
1114: if (stdinbufpos > 0)
1115: pfd[POLL_NETOUT].events = POLLOUT;
1116: /* filled buffer - remove self from polling */
1117: if (stdinbufpos == BUFSIZE)
1118: pfd[POLL_STDIN].events = 0;
1119: }
1120: /* try to write to network */
1121: if (pfd[POLL_NETOUT].revents & POLLOUT && stdinbufpos > 0) {
1122: ret = drainbuf(pfd[POLL_NETOUT].fd, stdinbuf,
1.133 beck 1123: &stdinbufpos, tls_ctx);
1124: if (ret == TLS_WANT_POLLIN)
1125: pfd[POLL_NETOUT].events = POLLIN;
1126: else if (ret == TLS_WANT_POLLOUT)
1127: pfd[POLL_NETOUT].events = POLLOUT;
1128: else if (ret == -1)
1.125 tedu 1129: pfd[POLL_NETOUT].fd = -1;
1130: /* buffer empty - remove self from polling */
1131: if (stdinbufpos == 0)
1132: pfd[POLL_NETOUT].events = 0;
1133: /* buffer no longer full - poll stdin again */
1134: if (stdinbufpos < BUFSIZE)
1135: pfd[POLL_STDIN].events = POLLIN;
1136: }
1137: /* try to read from network */
1138: if (pfd[POLL_NETIN].revents & POLLIN && netinbufpos < BUFSIZE) {
1139: ret = fillbuf(pfd[POLL_NETIN].fd, netinbuf,
1.133 beck 1140: &netinbufpos, tls_ctx);
1141: if (ret == TLS_WANT_POLLIN)
1142: pfd[POLL_NETIN].events = POLLIN;
1143: else if (ret == TLS_WANT_POLLOUT)
1144: pfd[POLL_NETIN].events = POLLOUT;
1145: else if (ret == -1)
1.125 tedu 1146: pfd[POLL_NETIN].fd = -1;
1147: /* eof on net in - remove from pfd */
1148: if (ret == 0) {
1149: shutdown(pfd[POLL_NETIN].fd, SHUT_RD);
1150: pfd[POLL_NETIN].fd = -1;
1.50 vincent 1151: }
1.125 tedu 1152: /* read something - poll stdout */
1153: if (netinbufpos > 0)
1154: pfd[POLL_STDOUT].events = POLLOUT;
1155: /* filled buffer - remove self from polling */
1156: if (netinbufpos == BUFSIZE)
1157: pfd[POLL_NETIN].events = 0;
1158: /* handle telnet */
1159: if (tflag)
1160: atelnet(pfd[POLL_NETIN].fd, netinbuf,
1161: netinbufpos);
1162: }
1163: /* try to write to stdout */
1164: if (pfd[POLL_STDOUT].revents & POLLOUT && netinbufpos > 0) {
1165: ret = drainbuf(pfd[POLL_STDOUT].fd, netinbuf,
1.133 beck 1166: &netinbufpos, NULL);
1167: if (ret == TLS_WANT_POLLIN)
1168: pfd[POLL_STDOUT].events = POLLIN;
1169: else if (ret == TLS_WANT_POLLOUT)
1170: pfd[POLL_STDOUT].events = POLLOUT;
1171: else if (ret == -1)
1.125 tedu 1172: pfd[POLL_STDOUT].fd = -1;
1173: /* buffer empty - remove self from polling */
1174: if (netinbufpos == 0)
1175: pfd[POLL_STDOUT].events = 0;
1176: /* buffer no longer full - poll net in again */
1177: if (netinbufpos < BUFSIZE)
1178: pfd[POLL_NETIN].events = POLLIN;
1179: }
1180:
1181: /* stdin gone and queue empty? */
1182: if (pfd[POLL_STDIN].fd == -1 && stdinbufpos == 0) {
1183: if (pfd[POLL_NETOUT].fd != -1 && Nflag)
1184: shutdown(pfd[POLL_NETOUT].fd, SHUT_WR);
1185: pfd[POLL_NETOUT].fd = -1;
1186: }
1187: /* net in gone and queue empty? */
1188: if (pfd[POLL_NETIN].fd == -1 && netinbufpos == 0) {
1189: pfd[POLL_STDOUT].fd = -1;
1.21 ericj 1190: }
1.11 ericj 1191: }
1.125 tedu 1192: }
1193:
1194: ssize_t
1.133 beck 1195: drainbuf(int fd, unsigned char *buf, size_t *bufpos, struct tls *tls)
1.125 tedu 1196: {
1197: ssize_t n;
1198: ssize_t adjust;
1199:
1.133 beck 1200: if (tls)
1201: n = tls_write(tls, buf, *bufpos);
1202: else {
1203: n = write(fd, buf, *bufpos);
1204: /* don't treat EAGAIN, EINTR as error */
1205: if (n == -1 && (errno == EAGAIN || errno == EINTR))
1206: n = TLS_WANT_POLLOUT;
1207: }
1.125 tedu 1208: if (n <= 0)
1209: return n;
1210: /* adjust buffer */
1211: adjust = *bufpos - n;
1212: if (adjust > 0)
1213: memmove(buf, buf + n, adjust);
1214: *bufpos -= n;
1215: return n;
1216: }
1217:
1218: ssize_t
1.133 beck 1219: fillbuf(int fd, unsigned char *buf, size_t *bufpos, struct tls *tls)
1.125 tedu 1220: {
1221: size_t num = BUFSIZE - *bufpos;
1222: ssize_t n;
1223:
1.133 beck 1224: if (tls)
1225: n = tls_read(tls, buf + *bufpos, num);
1226: else {
1227: n = read(fd, buf + *bufpos, num);
1228: /* don't treat EAGAIN, EINTR as error */
1229: if (n == -1 && (errno == EAGAIN || errno == EINTR))
1230: n = TLS_WANT_POLLIN;
1231: }
1.125 tedu 1232: if (n <= 0)
1233: return n;
1234: *bufpos += n;
1235: return n;
1.113 djm 1236: }
1237:
1238: /*
1239: * fdpass()
1240: * Pass the connected file descriptor to stdout and exit.
1241: */
1242: void
1243: fdpass(int nfd)
1244: {
1245: struct msghdr mh;
1246: union {
1247: struct cmsghdr hdr;
1248: char buf[CMSG_SPACE(sizeof(int))];
1249: } cmsgbuf;
1250: struct cmsghdr *cmsg;
1251: struct iovec iov;
1252: char c = '\0';
1253: ssize_t r;
1254: struct pollfd pfd;
1255:
1256: /* Avoid obvious stupidity */
1257: if (isatty(STDOUT_FILENO))
1258: errx(1, "Cannot pass file descriptor to tty");
1259:
1260: bzero(&mh, sizeof(mh));
1261: bzero(&cmsgbuf, sizeof(cmsgbuf));
1262: bzero(&iov, sizeof(iov));
1263:
1264: mh.msg_control = (caddr_t)&cmsgbuf.buf;
1265: mh.msg_controllen = sizeof(cmsgbuf.buf);
1266: cmsg = CMSG_FIRSTHDR(&mh);
1267: cmsg->cmsg_len = CMSG_LEN(sizeof(int));
1268: cmsg->cmsg_level = SOL_SOCKET;
1269: cmsg->cmsg_type = SCM_RIGHTS;
1270: *(int *)CMSG_DATA(cmsg) = nfd;
1271:
1272: iov.iov_base = &c;
1273: iov.iov_len = 1;
1274: mh.msg_iov = &iov;
1275: mh.msg_iovlen = 1;
1276:
1277: bzero(&pfd, sizeof(pfd));
1278: pfd.fd = STDOUT_FILENO;
1.128 tobias 1279: pfd.events = POLLOUT;
1.113 djm 1280: for (;;) {
1281: r = sendmsg(STDOUT_FILENO, &mh, 0);
1282: if (r == -1) {
1283: if (errno == EAGAIN || errno == EINTR) {
1284: if (poll(&pfd, 1, -1) == -1)
1285: err(1, "poll");
1286: continue;
1287: }
1288: err(1, "sendmsg");
1.128 tobias 1289: } else if (r != 1)
1.113 djm 1290: errx(1, "sendmsg: unexpected return value %zd", r);
1291: else
1292: break;
1293: }
1294: exit(0);
1.7 deraadt 1295: }
1.50 vincent 1296:
1.67 jmc 1297: /* Deal with RFC 854 WILL/WONT DO/DONT negotiation. */
1.21 ericj 1298: void
1.37 jakob 1299: atelnet(int nfd, unsigned char *buf, unsigned int size)
1.6 deraadt 1300: {
1.24 ericj 1301: unsigned char *p, *end;
1302: unsigned char obuf[4];
1303:
1.95 nicm 1304: if (size < 3)
1305: return;
1306: end = buf + size - 2;
1.24 ericj 1307:
1308: for (p = buf; p < end; p++) {
1.21 ericj 1309: if (*p != IAC)
1.95 nicm 1310: continue;
1.24 ericj 1311:
1.25 ericj 1312: obuf[0] = IAC;
1.24 ericj 1313: p++;
1.50 vincent 1314: if ((*p == WILL) || (*p == WONT))
1.24 ericj 1315: obuf[1] = DONT;
1.95 nicm 1316: else if ((*p == DO) || (*p == DONT))
1.24 ericj 1317: obuf[1] = WONT;
1.95 nicm 1318: else
1319: continue;
1320:
1321: p++;
1322: obuf[2] = *p;
1323: if (atomicio(vwrite, nfd, obuf, 3) != 3)
1324: warn("Write Error!");
1.11 ericj 1325: }
1.7 deraadt 1326: }
1327:
1.153 beck 1328:
1329: int
1330: strtoport(char *portstr, int udp)
1331: {
1332: struct servent *entry;
1333: const char *errstr;
1334: char *proto;
1335: int port = -1;
1336:
1337: proto = udp ? "udp" : "tcp";
1338:
1339: port = strtonum(portstr, 1, PORT_MAX, &errstr);
1340: if (errstr == NULL)
1341: return port;
1342: if (errno != EINVAL)
1343: errx(1, "port number %s: %s", errstr, portstr);
1344: if ((entry = getservbyname(portstr, proto)) == NULL)
1345: errx(1, "service \"%s\" unknown", portstr);
1346: return ntohs(entry->s_port);
1347: }
1348:
1.11 ericj 1349: /*
1.21 ericj 1350: * build_ports()
1.105 lum 1351: * Build an array of ports in portlist[], listing each port
1.67 jmc 1352: * that we should try to connect to.
1.11 ericj 1353: */
1.21 ericj 1354: void
1.37 jakob 1355: build_ports(char *p)
1.6 deraadt 1356: {
1.88 ray 1357: char *n;
1.21 ericj 1358: int hi, lo, cp;
1359: int x = 0;
1360:
1361: if ((n = strchr(p, '-')) != NULL) {
1362: *n = '\0';
1363: n++;
1364:
1.67 jmc 1365: /* Make sure the ports are in order: lowest->highest. */
1.153 beck 1366: hi = strtoport(n, uflag);
1367: lo = strtoport(p, uflag);
1.21 ericj 1368: if (lo > hi) {
1369: cp = hi;
1370: hi = lo;
1371: lo = cp;
1372: }
1373:
1.145 tb 1374: /*
1375: * Initialize portlist with a random permutation. Based on
1376: * Knuth, as in ip_randomid() in sys/netinet/ip_id.c.
1377: */
1.21 ericj 1378: if (rflag) {
1.145 tb 1379: for (x = 0; x <= hi - lo; x++) {
1380: cp = arc4random_uniform(x + 1);
1381: portlist[x] = portlist[cp];
1382: if (asprintf(&portlist[cp], "%d", x + lo) < 0)
1383: err(1, "asprintf");
1384: }
1385: } else { /* Load ports sequentially. */
1386: for (cp = lo; cp <= hi; cp++) {
1387: if (asprintf(&portlist[x], "%d", cp) < 0)
1388: err(1, "asprintf");
1389: x++;
1.6 deraadt 1390: }
1.11 ericj 1391: }
1.21 ericj 1392: } else {
1.153 beck 1393: char *tmp;
1394:
1395: hi = strtoport(p, uflag);
1396: if (asprintf(&tmp, "%d", hi) != -1)
1397: portlist[0] = tmp;
1398: else
1.55 fgsch 1399: err(1, NULL);
1.11 ericj 1400: }
1.13 ericj 1401: }
1402:
1403: /*
1.21 ericj 1404: * udptest()
1405: * Do a few writes to see if the UDP port is there.
1.105 lum 1406: * Fails once PF state table is full.
1.13 ericj 1407: */
1.21 ericj 1408: int
1.37 jakob 1409: udptest(int s)
1.13 ericj 1410: {
1.74 deraadt 1411: int i, ret;
1.13 ericj 1412:
1.52 vincent 1413: for (i = 0; i <= 3; i++) {
1.74 deraadt 1414: if (write(s, "X", 1) == 1)
1.21 ericj 1415: ret = 1;
1.14 ericj 1416: else
1.21 ericj 1417: ret = -1;
1.14 ericj 1418: }
1.21 ericj 1419: return (ret);
1.81 marius 1420: }
1421:
1.84 dtucker 1422: void
1.127 jca 1423: set_common_sockopts(int s, int af)
1.81 marius 1424: {
1425: int x = 1;
1426:
1427: if (Sflag) {
1428: if (setsockopt(s, IPPROTO_TCP, TCP_MD5SIG,
1429: &x, sizeof(x)) == -1)
1430: err(1, NULL);
1431: }
1432: if (Dflag) {
1433: if (setsockopt(s, SOL_SOCKET, SO_DEBUG,
1434: &x, sizeof(x)) == -1)
1435: err(1, NULL);
1436: }
1.83 dtucker 1437: if (Tflag != -1) {
1.157 bcook 1438: if (af == AF_INET && setsockopt(s, IPPROTO_IP,
1439: IP_TOS, &Tflag, sizeof(Tflag)) == -1)
1440: err(1, "set IP ToS");
1.127 jca 1441:
1.157 bcook 1442: else if (af == AF_INET6 && setsockopt(s, IPPROTO_IPV6,
1443: IPV6_TCLASS, &Tflag, sizeof(Tflag)) == -1)
1444: err(1, "set IPv6 traffic class");
1.83 dtucker 1445: }
1.90 djm 1446: if (Iflag) {
1447: if (setsockopt(s, SOL_SOCKET, SO_RCVBUF,
1448: &Iflag, sizeof(Iflag)) == -1)
1449: err(1, "set TCP receive buffer size");
1450: }
1451: if (Oflag) {
1452: if (setsockopt(s, SOL_SOCKET, SO_SNDBUF,
1453: &Oflag, sizeof(Oflag)) == -1)
1454: err(1, "set TCP send buffer size");
1455: }
1.157 bcook 1456:
1457: if (ttl != -1) {
1458: if (af == AF_INET && setsockopt(s, IPPROTO_IP,
1459: IP_TTL, &ttl, sizeof(ttl)))
1460: err(1, "set IP TTL");
1461:
1462: else if (af == AF_INET6 && setsockopt(s, IPPROTO_IPV6,
1463: IPV6_UNICAST_HOPS, &ttl, sizeof(ttl)))
1464: err(1, "set IPv6 unicast hops");
1465: }
1466:
1467: if (minttl != -1) {
1468: if (af == AF_INET && setsockopt(s, IPPROTO_IP,
1469: IP_MINTTL, &minttl, sizeof(minttl)))
1470: err(1, "set IP min TTL");
1471:
1472: else if (af == AF_INET6 && setsockopt(s, IPPROTO_IPV6,
1473: IPV6_MINHOPCOUNT, &minttl, sizeof(minttl)))
1474: err(1, "set IPv6 min hop count");
1.156 jca 1475: }
1.83 dtucker 1476: }
1477:
1478: int
1.102 haesbaer 1479: map_tos(char *s, int *val)
1.83 dtucker 1480: {
1.102 haesbaer 1481: /* DiffServ Codepoints and other TOS mappings */
1482: const struct toskeywords {
1483: const char *keyword;
1484: int val;
1485: } *t, toskeywords[] = {
1486: { "af11", IPTOS_DSCP_AF11 },
1487: { "af12", IPTOS_DSCP_AF12 },
1488: { "af13", IPTOS_DSCP_AF13 },
1489: { "af21", IPTOS_DSCP_AF21 },
1490: { "af22", IPTOS_DSCP_AF22 },
1491: { "af23", IPTOS_DSCP_AF23 },
1492: { "af31", IPTOS_DSCP_AF31 },
1493: { "af32", IPTOS_DSCP_AF32 },
1494: { "af33", IPTOS_DSCP_AF33 },
1495: { "af41", IPTOS_DSCP_AF41 },
1496: { "af42", IPTOS_DSCP_AF42 },
1497: { "af43", IPTOS_DSCP_AF43 },
1498: { "critical", IPTOS_PREC_CRITIC_ECP },
1499: { "cs0", IPTOS_DSCP_CS0 },
1500: { "cs1", IPTOS_DSCP_CS1 },
1501: { "cs2", IPTOS_DSCP_CS2 },
1502: { "cs3", IPTOS_DSCP_CS3 },
1503: { "cs4", IPTOS_DSCP_CS4 },
1504: { "cs5", IPTOS_DSCP_CS5 },
1505: { "cs6", IPTOS_DSCP_CS6 },
1506: { "cs7", IPTOS_DSCP_CS7 },
1507: { "ef", IPTOS_DSCP_EF },
1508: { "inetcontrol", IPTOS_PREC_INTERNETCONTROL },
1509: { "lowdelay", IPTOS_LOWDELAY },
1510: { "netcontrol", IPTOS_PREC_NETCONTROL },
1511: { "reliability", IPTOS_RELIABILITY },
1512: { "throughput", IPTOS_THROUGHPUT },
1.134 deraadt 1513: { NULL, -1 },
1.102 haesbaer 1514: };
1515:
1516: for (t = toskeywords; t->keyword != NULL; t++) {
1517: if (strcmp(s, t->keyword) == 0) {
1518: *val = t->val;
1519: return (1);
1520: }
1521: }
1.83 dtucker 1522:
1.102 haesbaer 1523: return (0);
1.108 haesbaer 1524: }
1525:
1.133 beck 1526: int
1527: map_tls(char *s, int *val)
1528: {
1529: const struct tlskeywords {
1530: const char *keyword;
1531: int val;
1532: } *t, tlskeywords[] = {
1.170 beck 1533: { "tlsall", TLS_ALL },
1.133 beck 1534: { "noverify", TLS_NOVERIFY },
1535: { "noname", TLS_NONAME },
1536: { "clientcert", TLS_CCERT},
1.167 beck 1537: { "muststaple", TLS_MUSTSTAPLE},
1.134 deraadt 1538: { NULL, -1 },
1.133 beck 1539: };
1540:
1541: for (t = tlskeywords; t->keyword != NULL; t++) {
1542: if (strcmp(s, t->keyword) == 0) {
1543: *val |= t->val;
1544: return (1);
1545: }
1546: }
1547: return (0);
1548: }
1549:
1550: void
1551: report_tls(struct tls * tls_ctx, char * host, char *tls_expectname)
1552: {
1.147 beck 1553: time_t t;
1.164 beck 1554: const char *ocsp_url;
1555:
1.138 beck 1556: fprintf(stderr, "TLS handshake negotiated %s/%s with host %s\n",
1557: tls_conn_version(tls_ctx), tls_conn_cipher(tls_ctx), host);
1.148 mmcc 1558: fprintf(stderr, "Peer name: %s\n",
1.133 beck 1559: tls_expectname ? tls_expectname : host);
1.137 beck 1560: if (tls_peer_cert_subject(tls_ctx))
1561: fprintf(stderr, "Subject: %s\n",
1562: tls_peer_cert_subject(tls_ctx));
1563: if (tls_peer_cert_issuer(tls_ctx))
1564: fprintf(stderr, "Issuer: %s\n",
1565: tls_peer_cert_issuer(tls_ctx));
1.147 beck 1566: if ((t = tls_peer_cert_notbefore(tls_ctx)) != -1)
1567: fprintf(stderr, "Valid From: %s", ctime(&t));
1568: if ((t = tls_peer_cert_notafter(tls_ctx)) != -1)
1569: fprintf(stderr, "Valid Until: %s", ctime(&t));
1.137 beck 1570: if (tls_peer_cert_hash(tls_ctx))
1571: fprintf(stderr, "Cert Hash: %s\n",
1572: tls_peer_cert_hash(tls_ctx));
1.164 beck 1573: ocsp_url = tls_peer_ocsp_url(tls_ctx);
1.166 beck 1574: if (ocsp_url != NULL)
1575: fprintf(stderr, "OCSP URL: %s\n", ocsp_url);
1.164 beck 1576: switch (tls_peer_ocsp_response_status(tls_ctx)) {
1577: case TLS_OCSP_RESPONSE_SUCCESSFUL:
1.165 beck 1578: fprintf(stderr, "OCSP Stapling: %s\n",
1.164 beck 1579: tls_peer_ocsp_result(tls_ctx) == NULL ? "" :
1580: tls_peer_ocsp_result(tls_ctx));
1581: fprintf(stderr,
1582: " response_status=%d cert_status=%d crl_reason=%d\n",
1583: tls_peer_ocsp_response_status(tls_ctx),
1584: tls_peer_ocsp_cert_status(tls_ctx),
1585: tls_peer_ocsp_crl_reason(tls_ctx));
1586: t = tls_peer_ocsp_this_update(tls_ctx);
1587: fprintf(stderr, " this update: %s",
1588: t != -1 ? ctime(&t) : "\n");
1589: t = tls_peer_ocsp_next_update(tls_ctx);
1590: fprintf(stderr, " next update: %s",
1591: t != -1 ? ctime(&t) : "\n");
1592: t = tls_peer_ocsp_revocation_time(tls_ctx);
1593: fprintf(stderr, " revocation: %s",
1594: t != -1 ? ctime(&t) : "\n");
1595: break;
1596: case -1:
1597: break;
1598: default:
1.165 beck 1599: fprintf(stderr, "OCSP Stapling: failure - response_status %d (%s)\n",
1.164 beck 1600: tls_peer_ocsp_response_status(tls_ctx),
1601: tls_peer_ocsp_result(tls_ctx) == NULL ? "" :
1602: tls_peer_ocsp_result(tls_ctx));
1603: break;
1604:
1605: }
1.133 beck 1606: }
1.147 beck 1607:
1.108 haesbaer 1608: void
1.151 beck 1609: report_connect(const struct sockaddr *sa, socklen_t salen, char *path)
1.108 haesbaer 1610: {
1611: char remote_host[NI_MAXHOST];
1612: char remote_port[NI_MAXSERV];
1613: int herr;
1614: int flags = NI_NUMERICSERV;
1.151 beck 1615:
1616: if (path != NULL) {
1617: fprintf(stderr, "Connection on %s received!\n", path);
1618: return;
1619: }
1.134 deraadt 1620:
1.108 haesbaer 1621: if (nflag)
1622: flags |= NI_NUMERICHOST;
1.134 deraadt 1623:
1.108 haesbaer 1624: if ((herr = getnameinfo(sa, salen,
1625: remote_host, sizeof(remote_host),
1626: remote_port, sizeof(remote_port),
1627: flags)) != 0) {
1628: if (herr == EAI_SYSTEM)
1629: err(1, "getnameinfo");
1630: else
1631: errx(1, "getnameinfo: %s", gai_strerror(herr));
1632: }
1.134 deraadt 1633:
1.108 haesbaer 1634: fprintf(stderr,
1635: "Connection from %s %s "
1636: "received!\n", remote_host, remote_port);
1.7 deraadt 1637: }
1.1 deraadt 1638:
1.11 ericj 1639: void
1.58 deraadt 1640: help(void)
1.1 deraadt 1641: {
1.21 ericj 1642: usage(0);
1643: fprintf(stderr, "\tCommand Summary:\n\
1644: \t-4 Use IPv4\n\
1645: \t-6 Use IPv6\n\
1.135 jmc 1646: \t-C certfile Public key file\n\
1647: \t-c Use TLS\n\
1.73 markus 1648: \t-D Enable the debug socket option\n\
1.69 tedu 1649: \t-d Detach from stdin\n\
1.135 jmc 1650: \t-e name\t Required name in peer certificate\n\
1.114 jmc 1651: \t-F Pass socket fd\n\
1.135 jmc 1652: \t-H hash\t Hash string of peer certificate\n\
1.21 ericj 1653: \t-h This help text\n\
1.90 djm 1654: \t-I length TCP receive buffer length\n\
1.135 jmc 1655: \t-i interval Delay interval for lines sent, ports scanned\n\
1656: \t-K keyfile Private key file\n\
1.21 ericj 1657: \t-k Keep inbound sockets open for multiple connects\n\
1658: \t-l Listen mode, for inbound connects\n\
1.156 jca 1659: \t-M ttl Outgoing TTL / Hop Limit\n\
1660: \t-m minttl Minimum incoming TTL / Hop Limit\n\
1.111 sthen 1661: \t-N Shutdown the network socket after EOF on stdin\n\
1.22 jasoni 1662: \t-n Suppress name/port resolutions\n\
1.90 djm 1663: \t-O length TCP send buffer length\n\
1.169 jmc 1664: \t-o staplefile Staple file\n\
1.86 djm 1665: \t-P proxyuser\tUsername for proxy authentication\n\
1.36 jakob 1666: \t-p port\t Specify local port for remote connects\n\
1.135 jmc 1667: \t-R CAfile CA bundle\n\
1.21 ericj 1668: \t-r Randomize remote ports\n\
1.67 jmc 1669: \t-S Enable the TCP MD5 signature option\n\
1.135 jmc 1670: \t-s source Local source address\n\
1671: \t-T keyword TOS value or TLS options\n\
1.21 ericj 1672: \t-t Answer TELNET negotiation\n\
1.67 jmc 1673: \t-U Use UNIX domain socket\n\
1.21 ericj 1674: \t-u UDP mode\n\
1.98 guenther 1675: \t-V rtable Specify alternate routing table\n\
1.21 ericj 1676: \t-v Verbose\n\
1.135 jmc 1677: \t-w timeout Timeout for connects and final net reads\n\
1.75 djm 1678: \t-X proto Proxy protocol: \"4\", \"5\" (SOCKS) or \"connect\"\n\
1679: \t-x addr[:port]\tSpecify proxy address and port\n\
1.21 ericj 1680: \t-z Zero-I/O mode [used for scanning]\n\
1681: Port numbers can be individual or ranges: lo-hi [inclusive]\n");
1682: exit(1);
1.11 ericj 1683: }
1684:
1685: void
1.37 jakob 1686: usage(int ret)
1.11 ericj 1687: {
1.92 sobrado 1688: fprintf(stderr,
1.135 jmc 1689: "usage: nc [-46cDdFhklNnrStUuvz] [-C certfile] [-e name] "
1690: "[-H hash] [-I length]\n"
1.156 jca 1691: "\t [-i interval] [-K keyfile] [-M ttl] [-m minttl] [-O length]\n"
1.169 jmc 1692: "\t [-o staplefile] [-P proxy_username] [-p source_port] "
1693: "[-R CAfile]\n"
1694: "\t [-s source] [-T keyword] [-V rtable] [-w timeout] "
1695: "[-X proxy_protocol]\n"
1.156 jca 1696: "\t [-x proxy_address[:port]] [destination] [port]\n");
1.21 ericj 1697: if (ret)
1698: exit(1);
1.7 deraadt 1699: }
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