Annotation of src/usr.bin/nc/netcat.c, Revision 1.177
1.177 ! bluhm 1: /* $OpenBSD: netcat.c,v 1.176 2017/02/09 20:14:41 jca 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:
1.177 ! bluhm 600: if ((s = unix_connect(host)) > 0) {
! 601: if (!zflag)
! 602: readwrite(s, NULL);
1.42 ericj 603: close(s);
604: } else
605: ret = 1;
606:
1.99 jeremy 607: if (uflag)
608: unlink(unix_dg_tmp_socket);
1.42 ericj 609: exit(ret);
610:
1.21 ericj 611: } else {
612: int i = 0;
1.6 deraadt 613:
1.67 jmc 614: /* Construct the portlist[] array. */
1.21 ericj 615: build_ports(uport);
1.1 deraadt 616:
1.67 jmc 617: /* Cycle through portlist, connecting to each port. */
1.154 deraadt 618: for (s = -1, i = 0; portlist[i] != NULL; i++) {
619: if (s != -1)
1.21 ericj 620: close(s);
1.34 jakob 621:
1.133 beck 622: if (usetls) {
623: if ((tls_ctx = tls_client()) == NULL)
624: errx(1, "tls client creation failed");
625: if (tls_configure(tls_ctx, tls_cfg) == -1)
626: errx(1, "tls configuration failed (%s)",
627: tls_error(tls_ctx));
628: }
1.34 jakob 629: if (xflag)
630: s = socks_connect(host, portlist[i], hints,
1.172 jca 631: proxy, proxyport, proxyhints, socksv,
1.86 djm 632: Pflag);
1.34 jakob 633: else
634: s = remote_connect(host, portlist[i], hints);
635:
1.154 deraadt 636: if (s == -1)
1.21 ericj 637: continue;
1.1 deraadt 638:
1.21 ericj 639: ret = 0;
640: if (vflag || zflag) {
1.67 jmc 641: /* For UDP, make sure we are connected. */
1.21 ericj 642: if (uflag) {
1.50 vincent 643: if (udptest(s) == -1) {
1.21 ericj 644: ret = 1;
645: continue;
646: }
647: }
1.1 deraadt 648:
1.67 jmc 649: /* Don't look up port if -n. */
1.21 ericj 650: if (nflag)
651: sv = NULL;
652: else {
653: sv = getservbyport(
1.37 jakob 654: ntohs(atoi(portlist[i])),
655: uflag ? "udp" : "tcp");
1.21 ericj 656: }
1.50 vincent 657:
1.94 mpf 658: fprintf(stderr,
659: "Connection to %s %s port [%s/%s] "
660: "succeeded!\n", host, portlist[i],
661: uflag ? "udp" : "tcp",
1.37 jakob 662: sv ? sv->s_name : "*");
1.21 ericj 663: }
1.113 djm 664: if (Fflag)
665: fdpass(s);
1.133 beck 666: else {
667: if (usetls)
668: tls_setup_client(tls_ctx, s, host);
669: if (!zflag)
670: readwrite(s, tls_ctx);
671: if (tls_ctx) {
1.175 bluhm 672: timeout_tls(s, tls_ctx, tls_close);
1.133 beck 673: tls_free(tls_ctx);
674: tls_ctx = NULL;
675: }
676: }
1.7 deraadt 677: }
1.11 ericj 678: }
1.1 deraadt 679:
1.154 deraadt 680: if (s != -1)
1.21 ericj 681: close(s);
682:
1.133 beck 683: tls_config_free(tls_cfg);
684:
1.21 ericj 685: exit(ret);
1.7 deraadt 686: }
1.1 deraadt 687:
1.11 ericj 688: /*
1.99 jeremy 689: * unix_bind()
690: * Returns a unix socket bound to the given path
1.42 ericj 691: */
692: int
1.136 deraadt 693: unix_bind(char *path, int flags)
1.42 ericj 694: {
1.144 bcook 695: struct sockaddr_un s_un;
1.155 deraadt 696: int s, save_errno;
1.42 ericj 697:
1.99 jeremy 698: /* Create unix domain socket. */
1.136 deraadt 699: if ((s = socket(AF_UNIX, flags | (uflag ? SOCK_DGRAM : SOCK_STREAM),
700: 0)) < 0)
1.50 vincent 701: return (-1);
1.42 ericj 702:
1.144 bcook 703: memset(&s_un, 0, sizeof(struct sockaddr_un));
704: s_un.sun_family = AF_UNIX;
1.60 avsm 705:
1.144 bcook 706: if (strlcpy(s_un.sun_path, path, sizeof(s_un.sun_path)) >=
707: sizeof(s_un.sun_path)) {
1.60 avsm 708: close(s);
709: errno = ENAMETOOLONG;
710: return (-1);
711: }
1.99 jeremy 712:
1.144 bcook 713: if (bind(s, (struct sockaddr *)&s_un, sizeof(s_un)) < 0) {
1.155 deraadt 714: save_errno = errno;
1.50 vincent 715: close(s);
1.155 deraadt 716: errno = save_errno;
1.50 vincent 717: return (-1);
1.42 ericj 718: }
719: return (s);
720: }
721:
1.173 bluhm 722: int
1.175 bluhm 723: timeout_tls(int s, struct tls *tls_ctx, int (*func)(struct tls *))
1.173 bluhm 724: {
725: struct pollfd pfd;
726: int ret;
727:
1.175 bluhm 728: while ((ret = (*func)(tls_ctx)) != 0) {
1.173 bluhm 729: if (ret == TLS_WANT_POLLIN)
730: pfd.events = POLLIN;
731: else if (ret == TLS_WANT_POLLOUT)
732: pfd.events = POLLOUT;
733: else
734: break;
735: pfd.fd = s;
736: if ((ret = poll(&pfd, 1, timeout)) == 1)
737: continue;
738: else if (ret == 0) {
739: errno = ETIMEDOUT;
740: ret = -1;
741: break;
742: } else
743: err(1, "poll failed");
744: }
745:
746: return (ret);
747: }
748:
1.133 beck 749: void
750: tls_setup_client(struct tls *tls_ctx, int s, char *host)
751: {
1.173 bluhm 752: const char *errstr;
1.136 deraadt 753:
1.133 beck 754: if (tls_connect_socket(tls_ctx, s,
755: tls_expectname ? tls_expectname : host) == -1) {
756: errx(1, "tls connection failed (%s)",
757: tls_error(tls_ctx));
758: }
1.175 bluhm 759: if (timeout_tls(s, tls_ctx, tls_handshake) == -1) {
1.173 bluhm 760: if ((errstr = tls_error(tls_ctx)) == NULL)
761: errstr = strerror(errno);
762: errx(1, "tls handshake failed (%s)", errstr);
763: }
1.133 beck 764: if (vflag)
765: report_tls(tls_ctx, host, tls_expectname);
1.137 beck 766: if (tls_expecthash && tls_peer_cert_hash(tls_ctx) &&
767: strcmp(tls_expecthash, tls_peer_cert_hash(tls_ctx)) != 0)
1.133 beck 768: errx(1, "peer certificate is not %s", tls_expecthash);
769: }
1.141 deraadt 770:
1.133 beck 771: struct tls *
772: tls_setup_server(struct tls *tls_ctx, int connfd, char *host)
773: {
774: struct tls *tls_cctx;
1.173 bluhm 775: const char *errstr;
1.136 deraadt 776:
1.173 bluhm 777: if (tls_accept_socket(tls_ctx, &tls_cctx, connfd) == -1) {
778: warnx("tls accept failed (%s)", tls_error(tls_ctx));
1.175 bluhm 779: } else if (timeout_tls(connfd, tls_cctx, tls_handshake) == -1) {
1.173 bluhm 780: if ((errstr = tls_error(tls_ctx)) == NULL)
781: errstr = strerror(errno);
782: warnx("tls handshake failed (%s)", errstr);
1.133 beck 783: } else {
784: int gotcert = tls_peer_cert_provided(tls_cctx);
1.136 deraadt 785:
1.133 beck 786: if (vflag && gotcert)
787: report_tls(tls_cctx, host, tls_expectname);
788: if ((TLSopt & TLS_CCERT) && !gotcert)
789: warnx("No client certificate provided");
1.137 beck 790: else if (gotcert && tls_peer_cert_hash(tls_ctx) && tls_expecthash &&
791: strcmp(tls_expecthash, tls_peer_cert_hash(tls_ctx)) != 0)
1.133 beck 792: warnx("peer certificate is not %s", tls_expecthash);
793: else if (gotcert && tls_expectname &&
1.134 deraadt 794: (!tls_peer_cert_contains_name(tls_cctx, tls_expectname)))
1.133 beck 795: warnx("name (%s) not found in client cert",
796: tls_expectname);
797: else {
798: return tls_cctx;
799: }
800: }
801: return NULL;
802: }
1.141 deraadt 803:
1.42 ericj 804: /*
1.99 jeremy 805: * unix_connect()
806: * Returns a socket connected to a local unix socket. Returns -1 on failure.
1.42 ericj 807: */
808: int
1.99 jeremy 809: unix_connect(char *path)
1.42 ericj 810: {
1.144 bcook 811: struct sockaddr_un s_un;
1.155 deraadt 812: int s, save_errno;
1.42 ericj 813:
1.99 jeremy 814: if (uflag) {
1.136 deraadt 815: if ((s = unix_bind(unix_dg_tmp_socket, SOCK_CLOEXEC)) < 0)
1.99 jeremy 816: return (-1);
817: } else {
1.136 deraadt 818: if ((s = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0)) < 0)
1.99 jeremy 819: return (-1);
820: }
1.42 ericj 821:
1.144 bcook 822: memset(&s_un, 0, sizeof(struct sockaddr_un));
823: s_un.sun_family = AF_UNIX;
1.60 avsm 824:
1.144 bcook 825: if (strlcpy(s_un.sun_path, path, sizeof(s_un.sun_path)) >=
826: sizeof(s_un.sun_path)) {
1.60 avsm 827: close(s);
828: errno = ENAMETOOLONG;
829: return (-1);
830: }
1.144 bcook 831: if (connect(s, (struct sockaddr *)&s_un, sizeof(s_un)) < 0) {
1.155 deraadt 832: save_errno = errno;
1.42 ericj 833: close(s);
1.155 deraadt 834: errno = save_errno;
1.42 ericj 835: return (-1);
836: }
1.99 jeremy 837: return (s);
838:
839: }
840:
841: /*
842: * unix_listen()
843: * Create a unix domain socket, and listen on it.
844: */
845: int
846: unix_listen(char *path)
847: {
848: int s;
1.136 deraadt 849: if ((s = unix_bind(path, 0)) < 0)
1.99 jeremy 850: return (-1);
1.42 ericj 851:
852: if (listen(s, 5) < 0) {
853: close(s);
854: return (-1);
855: }
856: return (s);
857: }
858:
859: /*
1.21 ericj 860: * remote_connect()
1.67 jmc 861: * Returns a socket connected to a remote host. Properly binds to a local
862: * port or source address if needed. Returns -1 on failure.
1.11 ericj 863: */
1.21 ericj 864: int
1.77 otto 865: remote_connect(const char *host, const char *port, struct addrinfo hints)
1.21 ericj 866: {
867: struct addrinfo *res, *res0;
1.163 bcook 868: int s = -1, error, on = 1, save_errno;
1.21 ericj 869:
1.161 halex 870: if ((error = getaddrinfo(host, port, &hints, &res0)))
1.176 jca 871: errx(1, "getaddrinfo for host \"%s\" port %s: %s", host,
872: port, gai_strerror(error));
1.21 ericj 873:
1.161 halex 874: for (res = res0; res; res = res->ai_next) {
875: if ((s = socket(res->ai_family, res->ai_socktype |
876: SOCK_NONBLOCK, res->ai_protocol)) < 0)
1.21 ericj 877: continue;
878:
1.67 jmc 879: /* Bind to a local port or source address if specified. */
1.21 ericj 880: if (sflag || pflag) {
881: struct addrinfo ahints, *ares;
1.6 deraadt 882:
1.91 markus 883: /* try SO_BINDANY, but don't insist */
884: setsockopt(s, SOL_SOCKET, SO_BINDANY, &on, sizeof(on));
1.21 ericj 885: memset(&ahints, 0, sizeof(struct addrinfo));
1.161 halex 886: ahints.ai_family = res->ai_family;
1.21 ericj 887: ahints.ai_socktype = uflag ? SOCK_DGRAM : SOCK_STREAM;
888: ahints.ai_protocol = uflag ? IPPROTO_UDP : IPPROTO_TCP;
1.25 ericj 889: ahints.ai_flags = AI_PASSIVE;
1.38 jakob 890: if ((error = getaddrinfo(sflag, pflag, &ahints, &ares)))
1.56 stevesk 891: errx(1, "getaddrinfo: %s", gai_strerror(error));
1.21 ericj 892:
893: if (bind(s, (struct sockaddr *)ares->ai_addr,
1.62 millert 894: ares->ai_addrlen) < 0)
1.119 guenther 895: err(1, "bind failed");
1.21 ericj 896: freeaddrinfo(ares);
1.6 deraadt 897: }
1.81 marius 898:
1.161 halex 899: set_common_sockopts(s, res->ai_family);
1.6 deraadt 900:
1.161 halex 901: if (timeout_connect(s, res->ai_addr, res->ai_addrlen) == 0)
1.6 deraadt 902: break;
1.143 deraadt 903: if (vflag)
1.71 mcbride 904: warn("connect to %s port %s (%s) failed", host, port,
905: uflag ? "udp" : "tcp");
1.34 jakob 906:
1.155 deraadt 907: save_errno = errno;
1.21 ericj 908: close(s);
1.155 deraadt 909: errno = save_errno;
1.21 ericj 910: s = -1;
1.161 halex 911: }
1.21 ericj 912:
1.161 halex 913: freeaddrinfo(res0);
1.1 deraadt 914:
1.21 ericj 915: return (s);
1.103 fgsch 916: }
917:
918: int
919: timeout_connect(int s, const struct sockaddr *name, socklen_t namelen)
920: {
921: struct pollfd pfd;
922: socklen_t optlen;
1.132 bluhm 923: int optval;
1.103 fgsch 924: int ret;
925:
926: if ((ret = connect(s, name, namelen)) != 0 && errno == EINPROGRESS) {
927: pfd.fd = s;
928: pfd.events = POLLOUT;
929: if ((ret = poll(&pfd, 1, timeout)) == 1) {
930: optlen = sizeof(optval);
931: if ((ret = getsockopt(s, SOL_SOCKET, SO_ERROR,
932: &optval, &optlen)) == 0) {
933: errno = optval;
934: ret = optval == 0 ? 0 : -1;
935: }
936: } else if (ret == 0) {
937: errno = ETIMEDOUT;
938: ret = -1;
939: } else
940: err(1, "poll failed");
941: }
942:
943: return (ret);
1.7 deraadt 944: }
1.1 deraadt 945:
1.11 ericj 946: /*
1.21 ericj 947: * local_listen()
1.67 jmc 948: * Returns a socket listening on a local port, binds to specified source
949: * address. Returns -1 on failure.
1.11 ericj 950: */
1.21 ericj 951: int
1.37 jakob 952: local_listen(char *host, char *port, struct addrinfo hints)
1.21 ericj 953: {
954: struct addrinfo *res, *res0;
1.163 bcook 955: int s = -1, ret, x = 1, save_errno;
1.21 ericj 956: int error;
1.6 deraadt 957:
1.67 jmc 958: /* Allow nodename to be null. */
1.21 ericj 959: hints.ai_flags |= AI_PASSIVE;
1.7 deraadt 960:
1.21 ericj 961: /*
962: * In the case of binding to a wildcard address
963: * default to binding to an ipv4 address.
964: */
965: if (host == NULL && hints.ai_family == AF_UNSPEC)
966: hints.ai_family = AF_INET;
1.1 deraadt 967:
1.161 halex 968: if ((error = getaddrinfo(host, port, &hints, &res0)))
1.70 deraadt 969: errx(1, "getaddrinfo: %s", gai_strerror(error));
1.14 ericj 970:
1.161 halex 971: for (res = res0; res; res = res->ai_next) {
972: if ((s = socket(res->ai_family, res->ai_socktype,
973: res->ai_protocol)) < 0)
1.21 ericj 974: continue;
1.93 claudio 975:
1.21 ericj 976: ret = setsockopt(s, SOL_SOCKET, SO_REUSEPORT, &x, sizeof(x));
977: if (ret == -1)
1.30 smart 978: err(1, NULL);
1.81 marius 979:
1.161 halex 980: set_common_sockopts(s, res->ai_family);
1.1 deraadt 981:
1.161 halex 982: if (bind(s, (struct sockaddr *)res->ai_addr,
983: res->ai_addrlen) == 0)
1.21 ericj 984: break;
1.1 deraadt 985:
1.155 deraadt 986: save_errno = errno;
1.21 ericj 987: close(s);
1.155 deraadt 988: errno = save_errno;
1.21 ericj 989: s = -1;
1.161 halex 990: }
1.1 deraadt 991:
1.47 ericj 992: if (!uflag && s != -1) {
1.21 ericj 993: if (listen(s, 1) < 0)
1.57 stevesk 994: err(1, "listen");
1.12 ericj 995: }
1.1 deraadt 996:
1.161 halex 997: freeaddrinfo(res0);
1.1 deraadt 998:
1.21 ericj 999: return (s);
1.7 deraadt 1000: }
1001:
1.11 ericj 1002: /*
1.21 ericj 1003: * readwrite()
1004: * Loop that polls on the network file descriptor and stdin.
1.11 ericj 1005: */
1.21 ericj 1006: void
1.133 beck 1007: readwrite(int net_fd, struct tls *tls_ctx)
1.6 deraadt 1008: {
1.125 tedu 1009: struct pollfd pfd[4];
1010: int stdin_fd = STDIN_FILENO;
1011: int stdout_fd = STDOUT_FILENO;
1012: unsigned char netinbuf[BUFSIZE];
1013: size_t netinbufpos = 0;
1014: unsigned char stdinbuf[BUFSIZE];
1015: size_t stdinbufpos = 0;
1.130 chl 1016: int n, num_fds;
1.125 tedu 1017: ssize_t ret;
1018:
1019: /* don't read from stdin if requested */
1020: if (dflag)
1021: stdin_fd = -1;
1022:
1023: /* stdin */
1024: pfd[POLL_STDIN].fd = stdin_fd;
1025: pfd[POLL_STDIN].events = POLLIN;
1026:
1027: /* network out */
1028: pfd[POLL_NETOUT].fd = net_fd;
1029: pfd[POLL_NETOUT].events = 0;
1030:
1031: /* network in */
1032: pfd[POLL_NETIN].fd = net_fd;
1033: pfd[POLL_NETIN].events = POLLIN;
1034:
1035: /* stdout */
1036: pfd[POLL_STDOUT].fd = stdout_fd;
1037: pfd[POLL_STDOUT].events = 0;
1038:
1039: while (1) {
1040: /* both inputs are gone, buffers are empty, we are done */
1.134 deraadt 1041: if (pfd[POLL_STDIN].fd == -1 && pfd[POLL_NETIN].fd == -1 &&
1.174 bluhm 1042: stdinbufpos == 0 && netinbufpos == 0)
1.125 tedu 1043: return;
1044: /* both outputs are gone, we can't continue */
1.174 bluhm 1045: if (pfd[POLL_NETOUT].fd == -1 && pfd[POLL_STDOUT].fd == -1)
1.125 tedu 1046: return;
1047: /* listen and net in gone, queues empty, done */
1.134 deraadt 1048: if (lflag && pfd[POLL_NETIN].fd == -1 &&
1.174 bluhm 1049: stdinbufpos == 0 && netinbufpos == 0)
1.125 tedu 1050: return;
1.21 ericj 1051:
1.125 tedu 1052: /* help says -i is for "wait between lines sent". We read and
1053: * write arbitrary amounts of data, and we don't want to start
1054: * scanning for newlines, so this is as good as it gets */
1.21 ericj 1055: if (iflag)
1056: sleep(iflag);
1057:
1.125 tedu 1058: /* poll */
1059: num_fds = poll(pfd, 4, timeout);
1060:
1061: /* treat poll errors */
1.174 bluhm 1062: if (num_fds == -1)
1.125 tedu 1063: err(1, "polling error");
1.49 hugh 1064:
1.125 tedu 1065: /* timeout happened */
1066: if (num_fds == 0)
1.49 hugh 1067: return;
1.21 ericj 1068:
1.125 tedu 1069: /* treat socket error conditions */
1070: for (n = 0; n < 4; n++) {
1071: if (pfd[n].revents & (POLLERR|POLLNVAL)) {
1072: pfd[n].fd = -1;
1.6 deraadt 1073: }
1.21 ericj 1074: }
1.125 tedu 1075: /* reading is possible after HUP */
1076: if (pfd[POLL_STDIN].events & POLLIN &&
1077: pfd[POLL_STDIN].revents & POLLHUP &&
1.134 deraadt 1078: !(pfd[POLL_STDIN].revents & POLLIN))
1079: pfd[POLL_STDIN].fd = -1;
1.125 tedu 1080:
1081: if (pfd[POLL_NETIN].events & POLLIN &&
1082: pfd[POLL_NETIN].revents & POLLHUP &&
1.134 deraadt 1083: !(pfd[POLL_NETIN].revents & POLLIN))
1084: pfd[POLL_NETIN].fd = -1;
1.125 tedu 1085:
1086: if (pfd[POLL_NETOUT].revents & POLLHUP) {
1087: if (Nflag)
1088: shutdown(pfd[POLL_NETOUT].fd, SHUT_WR);
1089: pfd[POLL_NETOUT].fd = -1;
1090: }
1091: /* if HUP, stop watching stdout */
1092: if (pfd[POLL_STDOUT].revents & POLLHUP)
1093: pfd[POLL_STDOUT].fd = -1;
1094: /* if no net out, stop watching stdin */
1095: if (pfd[POLL_NETOUT].fd == -1)
1096: pfd[POLL_STDIN].fd = -1;
1097: /* if no stdout, stop watching net in */
1098: if (pfd[POLL_STDOUT].fd == -1) {
1099: if (pfd[POLL_NETIN].fd != -1)
1100: shutdown(pfd[POLL_NETIN].fd, SHUT_RD);
1101: pfd[POLL_NETIN].fd = -1;
1102: }
1.21 ericj 1103:
1.125 tedu 1104: /* try to read from stdin */
1105: if (pfd[POLL_STDIN].revents & POLLIN && stdinbufpos < BUFSIZE) {
1106: ret = fillbuf(pfd[POLL_STDIN].fd, stdinbuf,
1.133 beck 1107: &stdinbufpos, NULL);
1108: if (ret == TLS_WANT_POLLIN)
1109: pfd[POLL_STDIN].events = POLLIN;
1110: else if (ret == TLS_WANT_POLLOUT)
1111: pfd[POLL_STDIN].events = POLLOUT;
1112: else if (ret == 0 || ret == -1)
1.125 tedu 1113: pfd[POLL_STDIN].fd = -1;
1114: /* read something - poll net out */
1115: if (stdinbufpos > 0)
1116: pfd[POLL_NETOUT].events = POLLOUT;
1117: /* filled buffer - remove self from polling */
1118: if (stdinbufpos == BUFSIZE)
1119: pfd[POLL_STDIN].events = 0;
1120: }
1121: /* try to write to network */
1122: if (pfd[POLL_NETOUT].revents & POLLOUT && stdinbufpos > 0) {
1123: ret = drainbuf(pfd[POLL_NETOUT].fd, stdinbuf,
1.133 beck 1124: &stdinbufpos, tls_ctx);
1125: if (ret == TLS_WANT_POLLIN)
1126: pfd[POLL_NETOUT].events = POLLIN;
1127: else if (ret == TLS_WANT_POLLOUT)
1128: pfd[POLL_NETOUT].events = POLLOUT;
1129: else if (ret == -1)
1.125 tedu 1130: pfd[POLL_NETOUT].fd = -1;
1131: /* buffer empty - remove self from polling */
1132: if (stdinbufpos == 0)
1133: pfd[POLL_NETOUT].events = 0;
1134: /* buffer no longer full - poll stdin again */
1135: if (stdinbufpos < BUFSIZE)
1136: pfd[POLL_STDIN].events = POLLIN;
1137: }
1138: /* try to read from network */
1139: if (pfd[POLL_NETIN].revents & POLLIN && netinbufpos < BUFSIZE) {
1140: ret = fillbuf(pfd[POLL_NETIN].fd, netinbuf,
1.133 beck 1141: &netinbufpos, tls_ctx);
1142: if (ret == TLS_WANT_POLLIN)
1143: pfd[POLL_NETIN].events = POLLIN;
1144: else if (ret == TLS_WANT_POLLOUT)
1145: pfd[POLL_NETIN].events = POLLOUT;
1146: else if (ret == -1)
1.125 tedu 1147: pfd[POLL_NETIN].fd = -1;
1148: /* eof on net in - remove from pfd */
1149: if (ret == 0) {
1150: shutdown(pfd[POLL_NETIN].fd, SHUT_RD);
1151: pfd[POLL_NETIN].fd = -1;
1.50 vincent 1152: }
1.125 tedu 1153: /* read something - poll stdout */
1154: if (netinbufpos > 0)
1155: pfd[POLL_STDOUT].events = POLLOUT;
1156: /* filled buffer - remove self from polling */
1157: if (netinbufpos == BUFSIZE)
1158: pfd[POLL_NETIN].events = 0;
1159: /* handle telnet */
1160: if (tflag)
1161: atelnet(pfd[POLL_NETIN].fd, netinbuf,
1162: netinbufpos);
1163: }
1164: /* try to write to stdout */
1165: if (pfd[POLL_STDOUT].revents & POLLOUT && netinbufpos > 0) {
1166: ret = drainbuf(pfd[POLL_STDOUT].fd, netinbuf,
1.133 beck 1167: &netinbufpos, NULL);
1168: if (ret == TLS_WANT_POLLIN)
1169: pfd[POLL_STDOUT].events = POLLIN;
1170: else if (ret == TLS_WANT_POLLOUT)
1171: pfd[POLL_STDOUT].events = POLLOUT;
1172: else if (ret == -1)
1.125 tedu 1173: pfd[POLL_STDOUT].fd = -1;
1174: /* buffer empty - remove self from polling */
1175: if (netinbufpos == 0)
1176: pfd[POLL_STDOUT].events = 0;
1177: /* buffer no longer full - poll net in again */
1178: if (netinbufpos < BUFSIZE)
1179: pfd[POLL_NETIN].events = POLLIN;
1180: }
1181:
1182: /* stdin gone and queue empty? */
1183: if (pfd[POLL_STDIN].fd == -1 && stdinbufpos == 0) {
1184: if (pfd[POLL_NETOUT].fd != -1 && Nflag)
1185: shutdown(pfd[POLL_NETOUT].fd, SHUT_WR);
1186: pfd[POLL_NETOUT].fd = -1;
1187: }
1188: /* net in gone and queue empty? */
1189: if (pfd[POLL_NETIN].fd == -1 && netinbufpos == 0) {
1190: pfd[POLL_STDOUT].fd = -1;
1.21 ericj 1191: }
1.11 ericj 1192: }
1.125 tedu 1193: }
1194:
1195: ssize_t
1.133 beck 1196: drainbuf(int fd, unsigned char *buf, size_t *bufpos, struct tls *tls)
1.125 tedu 1197: {
1198: ssize_t n;
1199: ssize_t adjust;
1200:
1.133 beck 1201: if (tls)
1202: n = tls_write(tls, buf, *bufpos);
1203: else {
1204: n = write(fd, buf, *bufpos);
1205: /* don't treat EAGAIN, EINTR as error */
1206: if (n == -1 && (errno == EAGAIN || errno == EINTR))
1207: n = TLS_WANT_POLLOUT;
1208: }
1.125 tedu 1209: if (n <= 0)
1210: return n;
1211: /* adjust buffer */
1212: adjust = *bufpos - n;
1213: if (adjust > 0)
1214: memmove(buf, buf + n, adjust);
1215: *bufpos -= n;
1216: return n;
1217: }
1218:
1219: ssize_t
1.133 beck 1220: fillbuf(int fd, unsigned char *buf, size_t *bufpos, struct tls *tls)
1.125 tedu 1221: {
1222: size_t num = BUFSIZE - *bufpos;
1223: ssize_t n;
1224:
1.133 beck 1225: if (tls)
1226: n = tls_read(tls, buf + *bufpos, num);
1227: else {
1228: n = read(fd, buf + *bufpos, num);
1229: /* don't treat EAGAIN, EINTR as error */
1230: if (n == -1 && (errno == EAGAIN || errno == EINTR))
1231: n = TLS_WANT_POLLIN;
1232: }
1.125 tedu 1233: if (n <= 0)
1234: return n;
1235: *bufpos += n;
1236: return n;
1.113 djm 1237: }
1238:
1239: /*
1240: * fdpass()
1241: * Pass the connected file descriptor to stdout and exit.
1242: */
1243: void
1244: fdpass(int nfd)
1245: {
1246: struct msghdr mh;
1247: union {
1248: struct cmsghdr hdr;
1249: char buf[CMSG_SPACE(sizeof(int))];
1250: } cmsgbuf;
1251: struct cmsghdr *cmsg;
1252: struct iovec iov;
1253: char c = '\0';
1254: ssize_t r;
1255: struct pollfd pfd;
1256:
1257: /* Avoid obvious stupidity */
1258: if (isatty(STDOUT_FILENO))
1259: errx(1, "Cannot pass file descriptor to tty");
1260:
1261: bzero(&mh, sizeof(mh));
1262: bzero(&cmsgbuf, sizeof(cmsgbuf));
1263: bzero(&iov, sizeof(iov));
1264:
1265: mh.msg_control = (caddr_t)&cmsgbuf.buf;
1266: mh.msg_controllen = sizeof(cmsgbuf.buf);
1267: cmsg = CMSG_FIRSTHDR(&mh);
1268: cmsg->cmsg_len = CMSG_LEN(sizeof(int));
1269: cmsg->cmsg_level = SOL_SOCKET;
1270: cmsg->cmsg_type = SCM_RIGHTS;
1271: *(int *)CMSG_DATA(cmsg) = nfd;
1272:
1273: iov.iov_base = &c;
1274: iov.iov_len = 1;
1275: mh.msg_iov = &iov;
1276: mh.msg_iovlen = 1;
1277:
1278: bzero(&pfd, sizeof(pfd));
1279: pfd.fd = STDOUT_FILENO;
1.128 tobias 1280: pfd.events = POLLOUT;
1.113 djm 1281: for (;;) {
1282: r = sendmsg(STDOUT_FILENO, &mh, 0);
1283: if (r == -1) {
1284: if (errno == EAGAIN || errno == EINTR) {
1285: if (poll(&pfd, 1, -1) == -1)
1286: err(1, "poll");
1287: continue;
1288: }
1289: err(1, "sendmsg");
1.128 tobias 1290: } else if (r != 1)
1.113 djm 1291: errx(1, "sendmsg: unexpected return value %zd", r);
1292: else
1293: break;
1294: }
1295: exit(0);
1.7 deraadt 1296: }
1.50 vincent 1297:
1.67 jmc 1298: /* Deal with RFC 854 WILL/WONT DO/DONT negotiation. */
1.21 ericj 1299: void
1.37 jakob 1300: atelnet(int nfd, unsigned char *buf, unsigned int size)
1.6 deraadt 1301: {
1.24 ericj 1302: unsigned char *p, *end;
1303: unsigned char obuf[4];
1304:
1.95 nicm 1305: if (size < 3)
1306: return;
1307: end = buf + size - 2;
1.24 ericj 1308:
1309: for (p = buf; p < end; p++) {
1.21 ericj 1310: if (*p != IAC)
1.95 nicm 1311: continue;
1.24 ericj 1312:
1.25 ericj 1313: obuf[0] = IAC;
1.24 ericj 1314: p++;
1.50 vincent 1315: if ((*p == WILL) || (*p == WONT))
1.24 ericj 1316: obuf[1] = DONT;
1.95 nicm 1317: else if ((*p == DO) || (*p == DONT))
1.24 ericj 1318: obuf[1] = WONT;
1.95 nicm 1319: else
1320: continue;
1321:
1322: p++;
1323: obuf[2] = *p;
1324: if (atomicio(vwrite, nfd, obuf, 3) != 3)
1325: warn("Write Error!");
1.11 ericj 1326: }
1.7 deraadt 1327: }
1328:
1.153 beck 1329:
1330: int
1331: strtoport(char *portstr, int udp)
1332: {
1333: struct servent *entry;
1334: const char *errstr;
1335: char *proto;
1336: int port = -1;
1337:
1338: proto = udp ? "udp" : "tcp";
1339:
1340: port = strtonum(portstr, 1, PORT_MAX, &errstr);
1341: if (errstr == NULL)
1342: return port;
1343: if (errno != EINVAL)
1344: errx(1, "port number %s: %s", errstr, portstr);
1345: if ((entry = getservbyname(portstr, proto)) == NULL)
1346: errx(1, "service \"%s\" unknown", portstr);
1347: return ntohs(entry->s_port);
1348: }
1349:
1.11 ericj 1350: /*
1.21 ericj 1351: * build_ports()
1.105 lum 1352: * Build an array of ports in portlist[], listing each port
1.67 jmc 1353: * that we should try to connect to.
1.11 ericj 1354: */
1.21 ericj 1355: void
1.37 jakob 1356: build_ports(char *p)
1.6 deraadt 1357: {
1.88 ray 1358: char *n;
1.21 ericj 1359: int hi, lo, cp;
1360: int x = 0;
1361:
1362: if ((n = strchr(p, '-')) != NULL) {
1363: *n = '\0';
1364: n++;
1365:
1.67 jmc 1366: /* Make sure the ports are in order: lowest->highest. */
1.153 beck 1367: hi = strtoport(n, uflag);
1368: lo = strtoport(p, uflag);
1.21 ericj 1369: if (lo > hi) {
1370: cp = hi;
1371: hi = lo;
1372: lo = cp;
1373: }
1374:
1.145 tb 1375: /*
1376: * Initialize portlist with a random permutation. Based on
1377: * Knuth, as in ip_randomid() in sys/netinet/ip_id.c.
1378: */
1.21 ericj 1379: if (rflag) {
1.145 tb 1380: for (x = 0; x <= hi - lo; x++) {
1381: cp = arc4random_uniform(x + 1);
1382: portlist[x] = portlist[cp];
1383: if (asprintf(&portlist[cp], "%d", x + lo) < 0)
1384: err(1, "asprintf");
1385: }
1386: } else { /* Load ports sequentially. */
1387: for (cp = lo; cp <= hi; cp++) {
1388: if (asprintf(&portlist[x], "%d", cp) < 0)
1389: err(1, "asprintf");
1390: x++;
1.6 deraadt 1391: }
1.11 ericj 1392: }
1.21 ericj 1393: } else {
1.153 beck 1394: char *tmp;
1395:
1396: hi = strtoport(p, uflag);
1397: if (asprintf(&tmp, "%d", hi) != -1)
1398: portlist[0] = tmp;
1399: else
1.55 fgsch 1400: err(1, NULL);
1.11 ericj 1401: }
1.13 ericj 1402: }
1403:
1404: /*
1.21 ericj 1405: * udptest()
1406: * Do a few writes to see if the UDP port is there.
1.105 lum 1407: * Fails once PF state table is full.
1.13 ericj 1408: */
1.21 ericj 1409: int
1.37 jakob 1410: udptest(int s)
1.13 ericj 1411: {
1.74 deraadt 1412: int i, ret;
1.13 ericj 1413:
1.52 vincent 1414: for (i = 0; i <= 3; i++) {
1.74 deraadt 1415: if (write(s, "X", 1) == 1)
1.21 ericj 1416: ret = 1;
1.14 ericj 1417: else
1.21 ericj 1418: ret = -1;
1.14 ericj 1419: }
1.21 ericj 1420: return (ret);
1.81 marius 1421: }
1422:
1.84 dtucker 1423: void
1.127 jca 1424: set_common_sockopts(int s, int af)
1.81 marius 1425: {
1426: int x = 1;
1427:
1428: if (Sflag) {
1429: if (setsockopt(s, IPPROTO_TCP, TCP_MD5SIG,
1430: &x, sizeof(x)) == -1)
1431: err(1, NULL);
1432: }
1433: if (Dflag) {
1434: if (setsockopt(s, SOL_SOCKET, SO_DEBUG,
1435: &x, sizeof(x)) == -1)
1436: err(1, NULL);
1437: }
1.83 dtucker 1438: if (Tflag != -1) {
1.157 bcook 1439: if (af == AF_INET && setsockopt(s, IPPROTO_IP,
1440: IP_TOS, &Tflag, sizeof(Tflag)) == -1)
1441: err(1, "set IP ToS");
1.127 jca 1442:
1.157 bcook 1443: else if (af == AF_INET6 && setsockopt(s, IPPROTO_IPV6,
1444: IPV6_TCLASS, &Tflag, sizeof(Tflag)) == -1)
1445: err(1, "set IPv6 traffic class");
1.83 dtucker 1446: }
1.90 djm 1447: if (Iflag) {
1448: if (setsockopt(s, SOL_SOCKET, SO_RCVBUF,
1449: &Iflag, sizeof(Iflag)) == -1)
1450: err(1, "set TCP receive buffer size");
1451: }
1452: if (Oflag) {
1453: if (setsockopt(s, SOL_SOCKET, SO_SNDBUF,
1454: &Oflag, sizeof(Oflag)) == -1)
1455: err(1, "set TCP send buffer size");
1456: }
1.157 bcook 1457:
1458: if (ttl != -1) {
1459: if (af == AF_INET && setsockopt(s, IPPROTO_IP,
1460: IP_TTL, &ttl, sizeof(ttl)))
1461: err(1, "set IP TTL");
1462:
1463: else if (af == AF_INET6 && setsockopt(s, IPPROTO_IPV6,
1464: IPV6_UNICAST_HOPS, &ttl, sizeof(ttl)))
1465: err(1, "set IPv6 unicast hops");
1466: }
1467:
1468: if (minttl != -1) {
1469: if (af == AF_INET && setsockopt(s, IPPROTO_IP,
1470: IP_MINTTL, &minttl, sizeof(minttl)))
1471: err(1, "set IP min TTL");
1472:
1473: else if (af == AF_INET6 && setsockopt(s, IPPROTO_IPV6,
1474: IPV6_MINHOPCOUNT, &minttl, sizeof(minttl)))
1475: err(1, "set IPv6 min hop count");
1.156 jca 1476: }
1.83 dtucker 1477: }
1478:
1479: int
1.102 haesbaer 1480: map_tos(char *s, int *val)
1.83 dtucker 1481: {
1.102 haesbaer 1482: /* DiffServ Codepoints and other TOS mappings */
1483: const struct toskeywords {
1484: const char *keyword;
1485: int val;
1486: } *t, toskeywords[] = {
1487: { "af11", IPTOS_DSCP_AF11 },
1488: { "af12", IPTOS_DSCP_AF12 },
1489: { "af13", IPTOS_DSCP_AF13 },
1490: { "af21", IPTOS_DSCP_AF21 },
1491: { "af22", IPTOS_DSCP_AF22 },
1492: { "af23", IPTOS_DSCP_AF23 },
1493: { "af31", IPTOS_DSCP_AF31 },
1494: { "af32", IPTOS_DSCP_AF32 },
1495: { "af33", IPTOS_DSCP_AF33 },
1496: { "af41", IPTOS_DSCP_AF41 },
1497: { "af42", IPTOS_DSCP_AF42 },
1498: { "af43", IPTOS_DSCP_AF43 },
1499: { "critical", IPTOS_PREC_CRITIC_ECP },
1500: { "cs0", IPTOS_DSCP_CS0 },
1501: { "cs1", IPTOS_DSCP_CS1 },
1502: { "cs2", IPTOS_DSCP_CS2 },
1503: { "cs3", IPTOS_DSCP_CS3 },
1504: { "cs4", IPTOS_DSCP_CS4 },
1505: { "cs5", IPTOS_DSCP_CS5 },
1506: { "cs6", IPTOS_DSCP_CS6 },
1507: { "cs7", IPTOS_DSCP_CS7 },
1508: { "ef", IPTOS_DSCP_EF },
1509: { "inetcontrol", IPTOS_PREC_INTERNETCONTROL },
1510: { "lowdelay", IPTOS_LOWDELAY },
1511: { "netcontrol", IPTOS_PREC_NETCONTROL },
1512: { "reliability", IPTOS_RELIABILITY },
1513: { "throughput", IPTOS_THROUGHPUT },
1.134 deraadt 1514: { NULL, -1 },
1.102 haesbaer 1515: };
1516:
1517: for (t = toskeywords; t->keyword != NULL; t++) {
1518: if (strcmp(s, t->keyword) == 0) {
1519: *val = t->val;
1520: return (1);
1521: }
1522: }
1.83 dtucker 1523:
1.102 haesbaer 1524: return (0);
1.108 haesbaer 1525: }
1526:
1.133 beck 1527: int
1528: map_tls(char *s, int *val)
1529: {
1530: const struct tlskeywords {
1531: const char *keyword;
1532: int val;
1533: } *t, tlskeywords[] = {
1.170 beck 1534: { "tlsall", TLS_ALL },
1.133 beck 1535: { "noverify", TLS_NOVERIFY },
1536: { "noname", TLS_NONAME },
1537: { "clientcert", TLS_CCERT},
1.167 beck 1538: { "muststaple", TLS_MUSTSTAPLE},
1.134 deraadt 1539: { NULL, -1 },
1.133 beck 1540: };
1541:
1542: for (t = tlskeywords; t->keyword != NULL; t++) {
1543: if (strcmp(s, t->keyword) == 0) {
1544: *val |= t->val;
1545: return (1);
1546: }
1547: }
1548: return (0);
1549: }
1550:
1551: void
1552: report_tls(struct tls * tls_ctx, char * host, char *tls_expectname)
1553: {
1.147 beck 1554: time_t t;
1.164 beck 1555: const char *ocsp_url;
1556:
1.138 beck 1557: fprintf(stderr, "TLS handshake negotiated %s/%s with host %s\n",
1558: tls_conn_version(tls_ctx), tls_conn_cipher(tls_ctx), host);
1.148 mmcc 1559: fprintf(stderr, "Peer name: %s\n",
1.133 beck 1560: tls_expectname ? tls_expectname : host);
1.137 beck 1561: if (tls_peer_cert_subject(tls_ctx))
1562: fprintf(stderr, "Subject: %s\n",
1563: tls_peer_cert_subject(tls_ctx));
1564: if (tls_peer_cert_issuer(tls_ctx))
1565: fprintf(stderr, "Issuer: %s\n",
1566: tls_peer_cert_issuer(tls_ctx));
1.147 beck 1567: if ((t = tls_peer_cert_notbefore(tls_ctx)) != -1)
1568: fprintf(stderr, "Valid From: %s", ctime(&t));
1569: if ((t = tls_peer_cert_notafter(tls_ctx)) != -1)
1570: fprintf(stderr, "Valid Until: %s", ctime(&t));
1.137 beck 1571: if (tls_peer_cert_hash(tls_ctx))
1572: fprintf(stderr, "Cert Hash: %s\n",
1573: tls_peer_cert_hash(tls_ctx));
1.164 beck 1574: ocsp_url = tls_peer_ocsp_url(tls_ctx);
1.166 beck 1575: if (ocsp_url != NULL)
1576: fprintf(stderr, "OCSP URL: %s\n", ocsp_url);
1.164 beck 1577: switch (tls_peer_ocsp_response_status(tls_ctx)) {
1578: case TLS_OCSP_RESPONSE_SUCCESSFUL:
1.165 beck 1579: fprintf(stderr, "OCSP Stapling: %s\n",
1.164 beck 1580: tls_peer_ocsp_result(tls_ctx) == NULL ? "" :
1581: tls_peer_ocsp_result(tls_ctx));
1582: fprintf(stderr,
1583: " response_status=%d cert_status=%d crl_reason=%d\n",
1584: tls_peer_ocsp_response_status(tls_ctx),
1585: tls_peer_ocsp_cert_status(tls_ctx),
1586: tls_peer_ocsp_crl_reason(tls_ctx));
1587: t = tls_peer_ocsp_this_update(tls_ctx);
1588: fprintf(stderr, " this update: %s",
1589: t != -1 ? ctime(&t) : "\n");
1590: t = tls_peer_ocsp_next_update(tls_ctx);
1591: fprintf(stderr, " next update: %s",
1592: t != -1 ? ctime(&t) : "\n");
1593: t = tls_peer_ocsp_revocation_time(tls_ctx);
1594: fprintf(stderr, " revocation: %s",
1595: t != -1 ? ctime(&t) : "\n");
1596: break;
1597: case -1:
1598: break;
1599: default:
1.165 beck 1600: fprintf(stderr, "OCSP Stapling: failure - response_status %d (%s)\n",
1.164 beck 1601: tls_peer_ocsp_response_status(tls_ctx),
1602: tls_peer_ocsp_result(tls_ctx) == NULL ? "" :
1603: tls_peer_ocsp_result(tls_ctx));
1604: break;
1605:
1606: }
1.133 beck 1607: }
1.147 beck 1608:
1.108 haesbaer 1609: void
1.151 beck 1610: report_connect(const struct sockaddr *sa, socklen_t salen, char *path)
1.108 haesbaer 1611: {
1612: char remote_host[NI_MAXHOST];
1613: char remote_port[NI_MAXSERV];
1614: int herr;
1615: int flags = NI_NUMERICSERV;
1.151 beck 1616:
1617: if (path != NULL) {
1618: fprintf(stderr, "Connection on %s received!\n", path);
1619: return;
1620: }
1.134 deraadt 1621:
1.108 haesbaer 1622: if (nflag)
1623: flags |= NI_NUMERICHOST;
1.134 deraadt 1624:
1.108 haesbaer 1625: if ((herr = getnameinfo(sa, salen,
1626: remote_host, sizeof(remote_host),
1627: remote_port, sizeof(remote_port),
1628: flags)) != 0) {
1629: if (herr == EAI_SYSTEM)
1630: err(1, "getnameinfo");
1631: else
1632: errx(1, "getnameinfo: %s", gai_strerror(herr));
1633: }
1.134 deraadt 1634:
1.108 haesbaer 1635: fprintf(stderr,
1636: "Connection from %s %s "
1637: "received!\n", remote_host, remote_port);
1.7 deraadt 1638: }
1.1 deraadt 1639:
1.11 ericj 1640: void
1.58 deraadt 1641: help(void)
1.1 deraadt 1642: {
1.21 ericj 1643: usage(0);
1644: fprintf(stderr, "\tCommand Summary:\n\
1645: \t-4 Use IPv4\n\
1646: \t-6 Use IPv6\n\
1.135 jmc 1647: \t-C certfile Public key file\n\
1648: \t-c Use TLS\n\
1.73 markus 1649: \t-D Enable the debug socket option\n\
1.69 tedu 1650: \t-d Detach from stdin\n\
1.135 jmc 1651: \t-e name\t Required name in peer certificate\n\
1.114 jmc 1652: \t-F Pass socket fd\n\
1.135 jmc 1653: \t-H hash\t Hash string of peer certificate\n\
1.21 ericj 1654: \t-h This help text\n\
1.90 djm 1655: \t-I length TCP receive buffer length\n\
1.135 jmc 1656: \t-i interval Delay interval for lines sent, ports scanned\n\
1657: \t-K keyfile Private key file\n\
1.21 ericj 1658: \t-k Keep inbound sockets open for multiple connects\n\
1659: \t-l Listen mode, for inbound connects\n\
1.156 jca 1660: \t-M ttl Outgoing TTL / Hop Limit\n\
1661: \t-m minttl Minimum incoming TTL / Hop Limit\n\
1.111 sthen 1662: \t-N Shutdown the network socket after EOF on stdin\n\
1.22 jasoni 1663: \t-n Suppress name/port resolutions\n\
1.90 djm 1664: \t-O length TCP send buffer length\n\
1.169 jmc 1665: \t-o staplefile Staple file\n\
1.86 djm 1666: \t-P proxyuser\tUsername for proxy authentication\n\
1.36 jakob 1667: \t-p port\t Specify local port for remote connects\n\
1.135 jmc 1668: \t-R CAfile CA bundle\n\
1.21 ericj 1669: \t-r Randomize remote ports\n\
1.67 jmc 1670: \t-S Enable the TCP MD5 signature option\n\
1.135 jmc 1671: \t-s source Local source address\n\
1672: \t-T keyword TOS value or TLS options\n\
1.21 ericj 1673: \t-t Answer TELNET negotiation\n\
1.67 jmc 1674: \t-U Use UNIX domain socket\n\
1.21 ericj 1675: \t-u UDP mode\n\
1.98 guenther 1676: \t-V rtable Specify alternate routing table\n\
1.21 ericj 1677: \t-v Verbose\n\
1.135 jmc 1678: \t-w timeout Timeout for connects and final net reads\n\
1.75 djm 1679: \t-X proto Proxy protocol: \"4\", \"5\" (SOCKS) or \"connect\"\n\
1680: \t-x addr[:port]\tSpecify proxy address and port\n\
1.21 ericj 1681: \t-z Zero-I/O mode [used for scanning]\n\
1682: Port numbers can be individual or ranges: lo-hi [inclusive]\n");
1683: exit(1);
1.11 ericj 1684: }
1685:
1686: void
1.37 jakob 1687: usage(int ret)
1.11 ericj 1688: {
1.92 sobrado 1689: fprintf(stderr,
1.135 jmc 1690: "usage: nc [-46cDdFhklNnrStUuvz] [-C certfile] [-e name] "
1691: "[-H hash] [-I length]\n"
1.156 jca 1692: "\t [-i interval] [-K keyfile] [-M ttl] [-m minttl] [-O length]\n"
1.169 jmc 1693: "\t [-o staplefile] [-P proxy_username] [-p source_port] "
1694: "[-R CAfile]\n"
1695: "\t [-s source] [-T keyword] [-V rtable] [-w timeout] "
1696: "[-X proxy_protocol]\n"
1.156 jca 1697: "\t [-x proxy_address[:port]] [destination] [port]\n");
1.21 ericj 1698: if (ret)
1699: exit(1);
1.7 deraadt 1700: }