Annotation of src/usr.bin/nc/netcat.c, Revision 1.174
1.174 ! bluhm 1: /* $OpenBSD: netcat.c,v 1.173 2017/02/08 13:43:33 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);
1.173 bluhm 124: int timeout_handshake(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) {
581: int i;
1.136 deraadt 582:
1.133 beck 583: do {
584: i = tls_close(tls_cctx);
585: } while (i == TLS_WANT_POLLIN ||
586: i == TLS_WANT_POLLOUT);
587: tls_free(tls_cctx);
588: tls_cctx = NULL;
589: }
1.99 jeremy 590: close(connfd);
1.21 ericj 591: }
1.42 ericj 592: if (family != AF_UNIX)
593: close(s);
1.99 jeremy 594: else if (uflag) {
595: if (connect(s, NULL, 0) < 0)
596: err(1, "connect");
597: }
1.27 ericj 598:
1.21 ericj 599: if (!kflag)
600: break;
1.11 ericj 601: }
1.42 ericj 602: } else if (family == AF_UNIX) {
603: ret = 0;
604:
605: if ((s = unix_connect(host)) > 0 && !zflag) {
1.133 beck 606: readwrite(s, NULL);
1.42 ericj 607: close(s);
608: } else
609: ret = 1;
610:
1.99 jeremy 611: if (uflag)
612: unlink(unix_dg_tmp_socket);
1.42 ericj 613: exit(ret);
614:
1.21 ericj 615: } else {
616: int i = 0;
1.6 deraadt 617:
1.67 jmc 618: /* Construct the portlist[] array. */
1.21 ericj 619: build_ports(uport);
1.1 deraadt 620:
1.67 jmc 621: /* Cycle through portlist, connecting to each port. */
1.154 deraadt 622: for (s = -1, i = 0; portlist[i] != NULL; i++) {
623: if (s != -1)
1.21 ericj 624: close(s);
1.34 jakob 625:
1.133 beck 626: if (usetls) {
627: if ((tls_ctx = tls_client()) == NULL)
628: errx(1, "tls client creation failed");
629: if (tls_configure(tls_ctx, tls_cfg) == -1)
630: errx(1, "tls configuration failed (%s)",
631: tls_error(tls_ctx));
632: }
1.34 jakob 633: if (xflag)
634: s = socks_connect(host, portlist[i], hints,
1.172 jca 635: proxy, proxyport, proxyhints, socksv,
1.86 djm 636: Pflag);
1.34 jakob 637: else
638: s = remote_connect(host, portlist[i], hints);
639:
1.154 deraadt 640: if (s == -1)
1.21 ericj 641: continue;
1.1 deraadt 642:
1.21 ericj 643: ret = 0;
644: if (vflag || zflag) {
1.67 jmc 645: /* For UDP, make sure we are connected. */
1.21 ericj 646: if (uflag) {
1.50 vincent 647: if (udptest(s) == -1) {
1.21 ericj 648: ret = 1;
649: continue;
650: }
651: }
1.1 deraadt 652:
1.67 jmc 653: /* Don't look up port if -n. */
1.21 ericj 654: if (nflag)
655: sv = NULL;
656: else {
657: sv = getservbyport(
1.37 jakob 658: ntohs(atoi(portlist[i])),
659: uflag ? "udp" : "tcp");
1.21 ericj 660: }
1.50 vincent 661:
1.94 mpf 662: fprintf(stderr,
663: "Connection to %s %s port [%s/%s] "
664: "succeeded!\n", host, portlist[i],
665: uflag ? "udp" : "tcp",
1.37 jakob 666: sv ? sv->s_name : "*");
1.21 ericj 667: }
1.113 djm 668: if (Fflag)
669: fdpass(s);
1.133 beck 670: else {
671: if (usetls)
672: tls_setup_client(tls_ctx, s, host);
673: if (!zflag)
674: readwrite(s, tls_ctx);
675: if (tls_ctx) {
676: int j;
1.136 deraadt 677:
1.133 beck 678: do {
679: j = tls_close(tls_ctx);
680: } while (j == TLS_WANT_POLLIN ||
681: j == TLS_WANT_POLLOUT);
682: tls_free(tls_ctx);
683: tls_ctx = NULL;
684: }
685: }
1.7 deraadt 686: }
1.11 ericj 687: }
1.1 deraadt 688:
1.154 deraadt 689: if (s != -1)
1.21 ericj 690: close(s);
691:
1.133 beck 692: tls_config_free(tls_cfg);
693:
1.21 ericj 694: exit(ret);
1.7 deraadt 695: }
1.1 deraadt 696:
1.11 ericj 697: /*
1.99 jeremy 698: * unix_bind()
699: * Returns a unix socket bound to the given path
1.42 ericj 700: */
701: int
1.136 deraadt 702: unix_bind(char *path, int flags)
1.42 ericj 703: {
1.144 bcook 704: struct sockaddr_un s_un;
1.155 deraadt 705: int s, save_errno;
1.42 ericj 706:
1.99 jeremy 707: /* Create unix domain socket. */
1.136 deraadt 708: if ((s = socket(AF_UNIX, flags | (uflag ? SOCK_DGRAM : SOCK_STREAM),
709: 0)) < 0)
1.50 vincent 710: return (-1);
1.42 ericj 711:
1.144 bcook 712: memset(&s_un, 0, sizeof(struct sockaddr_un));
713: s_un.sun_family = AF_UNIX;
1.60 avsm 714:
1.144 bcook 715: if (strlcpy(s_un.sun_path, path, sizeof(s_un.sun_path)) >=
716: sizeof(s_un.sun_path)) {
1.60 avsm 717: close(s);
718: errno = ENAMETOOLONG;
719: return (-1);
720: }
1.99 jeremy 721:
1.144 bcook 722: if (bind(s, (struct sockaddr *)&s_un, sizeof(s_un)) < 0) {
1.155 deraadt 723: save_errno = errno;
1.50 vincent 724: close(s);
1.155 deraadt 725: errno = save_errno;
1.50 vincent 726: return (-1);
1.42 ericj 727: }
728: return (s);
729: }
730:
1.173 bluhm 731: int
732: timeout_handshake(int s, struct tls *tls_ctx)
733: {
734: struct pollfd pfd;
735: int ret;
736:
737: while ((ret = tls_handshake(tls_ctx)) != 0) {
738: if (ret == TLS_WANT_POLLIN)
739: pfd.events = POLLIN;
740: else if (ret == TLS_WANT_POLLOUT)
741: pfd.events = POLLOUT;
742: else
743: break;
744: pfd.fd = s;
745: if ((ret = poll(&pfd, 1, timeout)) == 1)
746: continue;
747: else if (ret == 0) {
748: errno = ETIMEDOUT;
749: ret = -1;
750: break;
751: } else
752: err(1, "poll failed");
753: }
754:
755: return (ret);
756: }
757:
1.133 beck 758: void
759: tls_setup_client(struct tls *tls_ctx, int s, char *host)
760: {
1.173 bluhm 761: const char *errstr;
1.136 deraadt 762:
1.133 beck 763: if (tls_connect_socket(tls_ctx, s,
764: tls_expectname ? tls_expectname : host) == -1) {
765: errx(1, "tls connection failed (%s)",
766: tls_error(tls_ctx));
767: }
1.173 bluhm 768: if (timeout_handshake(s, tls_ctx) == -1) {
769: if ((errstr = tls_error(tls_ctx)) == NULL)
770: errstr = strerror(errno);
771: errx(1, "tls handshake failed (%s)", errstr);
772: }
1.133 beck 773: if (vflag)
774: report_tls(tls_ctx, host, tls_expectname);
1.137 beck 775: if (tls_expecthash && tls_peer_cert_hash(tls_ctx) &&
776: strcmp(tls_expecthash, tls_peer_cert_hash(tls_ctx)) != 0)
1.133 beck 777: errx(1, "peer certificate is not %s", tls_expecthash);
778: }
1.141 deraadt 779:
1.133 beck 780: struct tls *
781: tls_setup_server(struct tls *tls_ctx, int connfd, char *host)
782: {
783: struct tls *tls_cctx;
1.173 bluhm 784: const char *errstr;
1.136 deraadt 785:
1.173 bluhm 786: if (tls_accept_socket(tls_ctx, &tls_cctx, connfd) == -1) {
787: warnx("tls accept failed (%s)", tls_error(tls_ctx));
788: } else if (timeout_handshake(connfd, tls_cctx) == -1) {
789: if ((errstr = tls_error(tls_ctx)) == NULL)
790: errstr = strerror(errno);
791: warnx("tls handshake failed (%s)", errstr);
1.133 beck 792: } else {
793: int gotcert = tls_peer_cert_provided(tls_cctx);
1.136 deraadt 794:
1.133 beck 795: if (vflag && gotcert)
796: report_tls(tls_cctx, host, tls_expectname);
797: if ((TLSopt & TLS_CCERT) && !gotcert)
798: warnx("No client certificate provided");
1.137 beck 799: else if (gotcert && tls_peer_cert_hash(tls_ctx) && tls_expecthash &&
800: strcmp(tls_expecthash, tls_peer_cert_hash(tls_ctx)) != 0)
1.133 beck 801: warnx("peer certificate is not %s", tls_expecthash);
802: else if (gotcert && tls_expectname &&
1.134 deraadt 803: (!tls_peer_cert_contains_name(tls_cctx, tls_expectname)))
1.133 beck 804: warnx("name (%s) not found in client cert",
805: tls_expectname);
806: else {
807: return tls_cctx;
808: }
809: }
810: return NULL;
811: }
1.141 deraadt 812:
1.42 ericj 813: /*
1.99 jeremy 814: * unix_connect()
815: * Returns a socket connected to a local unix socket. Returns -1 on failure.
1.42 ericj 816: */
817: int
1.99 jeremy 818: unix_connect(char *path)
1.42 ericj 819: {
1.144 bcook 820: struct sockaddr_un s_un;
1.155 deraadt 821: int s, save_errno;
1.42 ericj 822:
1.99 jeremy 823: if (uflag) {
1.136 deraadt 824: if ((s = unix_bind(unix_dg_tmp_socket, SOCK_CLOEXEC)) < 0)
1.99 jeremy 825: return (-1);
826: } else {
1.136 deraadt 827: if ((s = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0)) < 0)
1.99 jeremy 828: return (-1);
829: }
1.42 ericj 830:
1.144 bcook 831: memset(&s_un, 0, sizeof(struct sockaddr_un));
832: s_un.sun_family = AF_UNIX;
1.60 avsm 833:
1.144 bcook 834: if (strlcpy(s_un.sun_path, path, sizeof(s_un.sun_path)) >=
835: sizeof(s_un.sun_path)) {
1.60 avsm 836: close(s);
837: errno = ENAMETOOLONG;
838: return (-1);
839: }
1.144 bcook 840: if (connect(s, (struct sockaddr *)&s_un, sizeof(s_un)) < 0) {
1.155 deraadt 841: save_errno = errno;
1.42 ericj 842: close(s);
1.155 deraadt 843: errno = save_errno;
1.42 ericj 844: return (-1);
845: }
1.99 jeremy 846: return (s);
847:
848: }
849:
850: /*
851: * unix_listen()
852: * Create a unix domain socket, and listen on it.
853: */
854: int
855: unix_listen(char *path)
856: {
857: int s;
1.136 deraadt 858: if ((s = unix_bind(path, 0)) < 0)
1.99 jeremy 859: return (-1);
1.42 ericj 860:
861: if (listen(s, 5) < 0) {
862: close(s);
863: return (-1);
864: }
865: return (s);
866: }
867:
868: /*
1.21 ericj 869: * remote_connect()
1.67 jmc 870: * Returns a socket connected to a remote host. Properly binds to a local
871: * port or source address if needed. Returns -1 on failure.
1.11 ericj 872: */
1.21 ericj 873: int
1.77 otto 874: remote_connect(const char *host, const char *port, struct addrinfo hints)
1.21 ericj 875: {
876: struct addrinfo *res, *res0;
1.163 bcook 877: int s = -1, error, on = 1, save_errno;
1.21 ericj 878:
1.161 halex 879: if ((error = getaddrinfo(host, port, &hints, &res0)))
1.56 stevesk 880: errx(1, "getaddrinfo: %s", gai_strerror(error));
1.21 ericj 881:
1.161 halex 882: for (res = res0; res; res = res->ai_next) {
883: if ((s = socket(res->ai_family, res->ai_socktype |
884: SOCK_NONBLOCK, res->ai_protocol)) < 0)
1.21 ericj 885: continue;
886:
1.67 jmc 887: /* Bind to a local port or source address if specified. */
1.21 ericj 888: if (sflag || pflag) {
889: struct addrinfo ahints, *ares;
1.6 deraadt 890:
1.91 markus 891: /* try SO_BINDANY, but don't insist */
892: setsockopt(s, SOL_SOCKET, SO_BINDANY, &on, sizeof(on));
1.21 ericj 893: memset(&ahints, 0, sizeof(struct addrinfo));
1.161 halex 894: ahints.ai_family = res->ai_family;
1.21 ericj 895: ahints.ai_socktype = uflag ? SOCK_DGRAM : SOCK_STREAM;
896: ahints.ai_protocol = uflag ? IPPROTO_UDP : IPPROTO_TCP;
1.25 ericj 897: ahints.ai_flags = AI_PASSIVE;
1.38 jakob 898: if ((error = getaddrinfo(sflag, pflag, &ahints, &ares)))
1.56 stevesk 899: errx(1, "getaddrinfo: %s", gai_strerror(error));
1.21 ericj 900:
901: if (bind(s, (struct sockaddr *)ares->ai_addr,
1.62 millert 902: ares->ai_addrlen) < 0)
1.119 guenther 903: err(1, "bind failed");
1.21 ericj 904: freeaddrinfo(ares);
1.6 deraadt 905: }
1.81 marius 906:
1.161 halex 907: set_common_sockopts(s, res->ai_family);
1.6 deraadt 908:
1.161 halex 909: if (timeout_connect(s, res->ai_addr, res->ai_addrlen) == 0)
1.6 deraadt 910: break;
1.143 deraadt 911: if (vflag)
1.71 mcbride 912: warn("connect to %s port %s (%s) failed", host, port,
913: uflag ? "udp" : "tcp");
1.34 jakob 914:
1.155 deraadt 915: save_errno = errno;
1.21 ericj 916: close(s);
1.155 deraadt 917: errno = save_errno;
1.21 ericj 918: s = -1;
1.161 halex 919: }
1.21 ericj 920:
1.161 halex 921: freeaddrinfo(res0);
1.1 deraadt 922:
1.21 ericj 923: return (s);
1.103 fgsch 924: }
925:
926: int
927: timeout_connect(int s, const struct sockaddr *name, socklen_t namelen)
928: {
929: struct pollfd pfd;
930: socklen_t optlen;
1.132 bluhm 931: int optval;
1.103 fgsch 932: int ret;
933:
934: if ((ret = connect(s, name, namelen)) != 0 && errno == EINPROGRESS) {
935: pfd.fd = s;
936: pfd.events = POLLOUT;
937: if ((ret = poll(&pfd, 1, timeout)) == 1) {
938: optlen = sizeof(optval);
939: if ((ret = getsockopt(s, SOL_SOCKET, SO_ERROR,
940: &optval, &optlen)) == 0) {
941: errno = optval;
942: ret = optval == 0 ? 0 : -1;
943: }
944: } else if (ret == 0) {
945: errno = ETIMEDOUT;
946: ret = -1;
947: } else
948: err(1, "poll failed");
949: }
950:
951: return (ret);
1.7 deraadt 952: }
1.1 deraadt 953:
1.11 ericj 954: /*
1.21 ericj 955: * local_listen()
1.67 jmc 956: * Returns a socket listening on a local port, binds to specified source
957: * address. Returns -1 on failure.
1.11 ericj 958: */
1.21 ericj 959: int
1.37 jakob 960: local_listen(char *host, char *port, struct addrinfo hints)
1.21 ericj 961: {
962: struct addrinfo *res, *res0;
1.163 bcook 963: int s = -1, ret, x = 1, save_errno;
1.21 ericj 964: int error;
1.6 deraadt 965:
1.67 jmc 966: /* Allow nodename to be null. */
1.21 ericj 967: hints.ai_flags |= AI_PASSIVE;
1.7 deraadt 968:
1.21 ericj 969: /*
970: * In the case of binding to a wildcard address
971: * default to binding to an ipv4 address.
972: */
973: if (host == NULL && hints.ai_family == AF_UNSPEC)
974: hints.ai_family = AF_INET;
1.1 deraadt 975:
1.161 halex 976: if ((error = getaddrinfo(host, port, &hints, &res0)))
1.70 deraadt 977: errx(1, "getaddrinfo: %s", gai_strerror(error));
1.14 ericj 978:
1.161 halex 979: for (res = res0; res; res = res->ai_next) {
980: if ((s = socket(res->ai_family, res->ai_socktype,
981: res->ai_protocol)) < 0)
1.21 ericj 982: continue;
1.93 claudio 983:
1.21 ericj 984: ret = setsockopt(s, SOL_SOCKET, SO_REUSEPORT, &x, sizeof(x));
985: if (ret == -1)
1.30 smart 986: err(1, NULL);
1.81 marius 987:
1.161 halex 988: set_common_sockopts(s, res->ai_family);
1.1 deraadt 989:
1.161 halex 990: if (bind(s, (struct sockaddr *)res->ai_addr,
991: res->ai_addrlen) == 0)
1.21 ericj 992: break;
1.1 deraadt 993:
1.155 deraadt 994: save_errno = errno;
1.21 ericj 995: close(s);
1.155 deraadt 996: errno = save_errno;
1.21 ericj 997: s = -1;
1.161 halex 998: }
1.1 deraadt 999:
1.47 ericj 1000: if (!uflag && s != -1) {
1.21 ericj 1001: if (listen(s, 1) < 0)
1.57 stevesk 1002: err(1, "listen");
1.12 ericj 1003: }
1.1 deraadt 1004:
1.161 halex 1005: freeaddrinfo(res0);
1.1 deraadt 1006:
1.21 ericj 1007: return (s);
1.7 deraadt 1008: }
1009:
1.11 ericj 1010: /*
1.21 ericj 1011: * readwrite()
1012: * Loop that polls on the network file descriptor and stdin.
1.11 ericj 1013: */
1.21 ericj 1014: void
1.133 beck 1015: readwrite(int net_fd, struct tls *tls_ctx)
1.6 deraadt 1016: {
1.125 tedu 1017: struct pollfd pfd[4];
1018: int stdin_fd = STDIN_FILENO;
1019: int stdout_fd = STDOUT_FILENO;
1020: unsigned char netinbuf[BUFSIZE];
1021: size_t netinbufpos = 0;
1022: unsigned char stdinbuf[BUFSIZE];
1023: size_t stdinbufpos = 0;
1.130 chl 1024: int n, num_fds;
1.125 tedu 1025: ssize_t ret;
1026:
1027: /* don't read from stdin if requested */
1028: if (dflag)
1029: stdin_fd = -1;
1030:
1031: /* stdin */
1032: pfd[POLL_STDIN].fd = stdin_fd;
1033: pfd[POLL_STDIN].events = POLLIN;
1034:
1035: /* network out */
1036: pfd[POLL_NETOUT].fd = net_fd;
1037: pfd[POLL_NETOUT].events = 0;
1038:
1039: /* network in */
1040: pfd[POLL_NETIN].fd = net_fd;
1041: pfd[POLL_NETIN].events = POLLIN;
1042:
1043: /* stdout */
1044: pfd[POLL_STDOUT].fd = stdout_fd;
1045: pfd[POLL_STDOUT].events = 0;
1046:
1047: while (1) {
1048: /* both inputs are gone, buffers are empty, we are done */
1.134 deraadt 1049: if (pfd[POLL_STDIN].fd == -1 && pfd[POLL_NETIN].fd == -1 &&
1.174 ! bluhm 1050: stdinbufpos == 0 && netinbufpos == 0)
1.125 tedu 1051: return;
1052: /* both outputs are gone, we can't continue */
1.174 ! bluhm 1053: if (pfd[POLL_NETOUT].fd == -1 && pfd[POLL_STDOUT].fd == -1)
1.125 tedu 1054: return;
1055: /* listen and net in gone, queues empty, done */
1.134 deraadt 1056: if (lflag && pfd[POLL_NETIN].fd == -1 &&
1.174 ! bluhm 1057: stdinbufpos == 0 && netinbufpos == 0)
1.125 tedu 1058: return;
1.21 ericj 1059:
1.125 tedu 1060: /* help says -i is for "wait between lines sent". We read and
1061: * write arbitrary amounts of data, and we don't want to start
1062: * scanning for newlines, so this is as good as it gets */
1.21 ericj 1063: if (iflag)
1064: sleep(iflag);
1065:
1.125 tedu 1066: /* poll */
1067: num_fds = poll(pfd, 4, timeout);
1068:
1069: /* treat poll errors */
1.174 ! bluhm 1070: if (num_fds == -1)
1.125 tedu 1071: err(1, "polling error");
1.49 hugh 1072:
1.125 tedu 1073: /* timeout happened */
1074: if (num_fds == 0)
1.49 hugh 1075: return;
1.21 ericj 1076:
1.125 tedu 1077: /* treat socket error conditions */
1078: for (n = 0; n < 4; n++) {
1079: if (pfd[n].revents & (POLLERR|POLLNVAL)) {
1080: pfd[n].fd = -1;
1.6 deraadt 1081: }
1.21 ericj 1082: }
1.125 tedu 1083: /* reading is possible after HUP */
1084: if (pfd[POLL_STDIN].events & POLLIN &&
1085: pfd[POLL_STDIN].revents & POLLHUP &&
1.134 deraadt 1086: !(pfd[POLL_STDIN].revents & POLLIN))
1087: pfd[POLL_STDIN].fd = -1;
1.125 tedu 1088:
1089: if (pfd[POLL_NETIN].events & POLLIN &&
1090: pfd[POLL_NETIN].revents & POLLHUP &&
1.134 deraadt 1091: !(pfd[POLL_NETIN].revents & POLLIN))
1092: pfd[POLL_NETIN].fd = -1;
1.125 tedu 1093:
1094: if (pfd[POLL_NETOUT].revents & POLLHUP) {
1095: if (Nflag)
1096: shutdown(pfd[POLL_NETOUT].fd, SHUT_WR);
1097: pfd[POLL_NETOUT].fd = -1;
1098: }
1099: /* if HUP, stop watching stdout */
1100: if (pfd[POLL_STDOUT].revents & POLLHUP)
1101: pfd[POLL_STDOUT].fd = -1;
1102: /* if no net out, stop watching stdin */
1103: if (pfd[POLL_NETOUT].fd == -1)
1104: pfd[POLL_STDIN].fd = -1;
1105: /* if no stdout, stop watching net in */
1106: if (pfd[POLL_STDOUT].fd == -1) {
1107: if (pfd[POLL_NETIN].fd != -1)
1108: shutdown(pfd[POLL_NETIN].fd, SHUT_RD);
1109: pfd[POLL_NETIN].fd = -1;
1110: }
1.21 ericj 1111:
1.125 tedu 1112: /* try to read from stdin */
1113: if (pfd[POLL_STDIN].revents & POLLIN && stdinbufpos < BUFSIZE) {
1114: ret = fillbuf(pfd[POLL_STDIN].fd, stdinbuf,
1.133 beck 1115: &stdinbufpos, NULL);
1116: if (ret == TLS_WANT_POLLIN)
1117: pfd[POLL_STDIN].events = POLLIN;
1118: else if (ret == TLS_WANT_POLLOUT)
1119: pfd[POLL_STDIN].events = POLLOUT;
1120: else if (ret == 0 || ret == -1)
1.125 tedu 1121: pfd[POLL_STDIN].fd = -1;
1122: /* read something - poll net out */
1123: if (stdinbufpos > 0)
1124: pfd[POLL_NETOUT].events = POLLOUT;
1125: /* filled buffer - remove self from polling */
1126: if (stdinbufpos == BUFSIZE)
1127: pfd[POLL_STDIN].events = 0;
1128: }
1129: /* try to write to network */
1130: if (pfd[POLL_NETOUT].revents & POLLOUT && stdinbufpos > 0) {
1131: ret = drainbuf(pfd[POLL_NETOUT].fd, stdinbuf,
1.133 beck 1132: &stdinbufpos, tls_ctx);
1133: if (ret == TLS_WANT_POLLIN)
1134: pfd[POLL_NETOUT].events = POLLIN;
1135: else if (ret == TLS_WANT_POLLOUT)
1136: pfd[POLL_NETOUT].events = POLLOUT;
1137: else if (ret == -1)
1.125 tedu 1138: pfd[POLL_NETOUT].fd = -1;
1139: /* buffer empty - remove self from polling */
1140: if (stdinbufpos == 0)
1141: pfd[POLL_NETOUT].events = 0;
1142: /* buffer no longer full - poll stdin again */
1143: if (stdinbufpos < BUFSIZE)
1144: pfd[POLL_STDIN].events = POLLIN;
1145: }
1146: /* try to read from network */
1147: if (pfd[POLL_NETIN].revents & POLLIN && netinbufpos < BUFSIZE) {
1148: ret = fillbuf(pfd[POLL_NETIN].fd, netinbuf,
1.133 beck 1149: &netinbufpos, tls_ctx);
1150: if (ret == TLS_WANT_POLLIN)
1151: pfd[POLL_NETIN].events = POLLIN;
1152: else if (ret == TLS_WANT_POLLOUT)
1153: pfd[POLL_NETIN].events = POLLOUT;
1154: else if (ret == -1)
1.125 tedu 1155: pfd[POLL_NETIN].fd = -1;
1156: /* eof on net in - remove from pfd */
1157: if (ret == 0) {
1158: shutdown(pfd[POLL_NETIN].fd, SHUT_RD);
1159: pfd[POLL_NETIN].fd = -1;
1.50 vincent 1160: }
1.125 tedu 1161: /* read something - poll stdout */
1162: if (netinbufpos > 0)
1163: pfd[POLL_STDOUT].events = POLLOUT;
1164: /* filled buffer - remove self from polling */
1165: if (netinbufpos == BUFSIZE)
1166: pfd[POLL_NETIN].events = 0;
1167: /* handle telnet */
1168: if (tflag)
1169: atelnet(pfd[POLL_NETIN].fd, netinbuf,
1170: netinbufpos);
1171: }
1172: /* try to write to stdout */
1173: if (pfd[POLL_STDOUT].revents & POLLOUT && netinbufpos > 0) {
1174: ret = drainbuf(pfd[POLL_STDOUT].fd, netinbuf,
1.133 beck 1175: &netinbufpos, NULL);
1176: if (ret == TLS_WANT_POLLIN)
1177: pfd[POLL_STDOUT].events = POLLIN;
1178: else if (ret == TLS_WANT_POLLOUT)
1179: pfd[POLL_STDOUT].events = POLLOUT;
1180: else if (ret == -1)
1.125 tedu 1181: pfd[POLL_STDOUT].fd = -1;
1182: /* buffer empty - remove self from polling */
1183: if (netinbufpos == 0)
1184: pfd[POLL_STDOUT].events = 0;
1185: /* buffer no longer full - poll net in again */
1186: if (netinbufpos < BUFSIZE)
1187: pfd[POLL_NETIN].events = POLLIN;
1188: }
1189:
1190: /* stdin gone and queue empty? */
1191: if (pfd[POLL_STDIN].fd == -1 && stdinbufpos == 0) {
1192: if (pfd[POLL_NETOUT].fd != -1 && Nflag)
1193: shutdown(pfd[POLL_NETOUT].fd, SHUT_WR);
1194: pfd[POLL_NETOUT].fd = -1;
1195: }
1196: /* net in gone and queue empty? */
1197: if (pfd[POLL_NETIN].fd == -1 && netinbufpos == 0) {
1198: pfd[POLL_STDOUT].fd = -1;
1.21 ericj 1199: }
1.11 ericj 1200: }
1.125 tedu 1201: }
1202:
1203: ssize_t
1.133 beck 1204: drainbuf(int fd, unsigned char *buf, size_t *bufpos, struct tls *tls)
1.125 tedu 1205: {
1206: ssize_t n;
1207: ssize_t adjust;
1208:
1.133 beck 1209: if (tls)
1210: n = tls_write(tls, buf, *bufpos);
1211: else {
1212: n = write(fd, buf, *bufpos);
1213: /* don't treat EAGAIN, EINTR as error */
1214: if (n == -1 && (errno == EAGAIN || errno == EINTR))
1215: n = TLS_WANT_POLLOUT;
1216: }
1.125 tedu 1217: if (n <= 0)
1218: return n;
1219: /* adjust buffer */
1220: adjust = *bufpos - n;
1221: if (adjust > 0)
1222: memmove(buf, buf + n, adjust);
1223: *bufpos -= n;
1224: return n;
1225: }
1226:
1227: ssize_t
1.133 beck 1228: fillbuf(int fd, unsigned char *buf, size_t *bufpos, struct tls *tls)
1.125 tedu 1229: {
1230: size_t num = BUFSIZE - *bufpos;
1231: ssize_t n;
1232:
1.133 beck 1233: if (tls)
1234: n = tls_read(tls, buf + *bufpos, num);
1235: else {
1236: n = read(fd, buf + *bufpos, num);
1237: /* don't treat EAGAIN, EINTR as error */
1238: if (n == -1 && (errno == EAGAIN || errno == EINTR))
1239: n = TLS_WANT_POLLIN;
1240: }
1.125 tedu 1241: if (n <= 0)
1242: return n;
1243: *bufpos += n;
1244: return n;
1.113 djm 1245: }
1246:
1247: /*
1248: * fdpass()
1249: * Pass the connected file descriptor to stdout and exit.
1250: */
1251: void
1252: fdpass(int nfd)
1253: {
1254: struct msghdr mh;
1255: union {
1256: struct cmsghdr hdr;
1257: char buf[CMSG_SPACE(sizeof(int))];
1258: } cmsgbuf;
1259: struct cmsghdr *cmsg;
1260: struct iovec iov;
1261: char c = '\0';
1262: ssize_t r;
1263: struct pollfd pfd;
1264:
1265: /* Avoid obvious stupidity */
1266: if (isatty(STDOUT_FILENO))
1267: errx(1, "Cannot pass file descriptor to tty");
1268:
1269: bzero(&mh, sizeof(mh));
1270: bzero(&cmsgbuf, sizeof(cmsgbuf));
1271: bzero(&iov, sizeof(iov));
1272:
1273: mh.msg_control = (caddr_t)&cmsgbuf.buf;
1274: mh.msg_controllen = sizeof(cmsgbuf.buf);
1275: cmsg = CMSG_FIRSTHDR(&mh);
1276: cmsg->cmsg_len = CMSG_LEN(sizeof(int));
1277: cmsg->cmsg_level = SOL_SOCKET;
1278: cmsg->cmsg_type = SCM_RIGHTS;
1279: *(int *)CMSG_DATA(cmsg) = nfd;
1280:
1281: iov.iov_base = &c;
1282: iov.iov_len = 1;
1283: mh.msg_iov = &iov;
1284: mh.msg_iovlen = 1;
1285:
1286: bzero(&pfd, sizeof(pfd));
1287: pfd.fd = STDOUT_FILENO;
1.128 tobias 1288: pfd.events = POLLOUT;
1.113 djm 1289: for (;;) {
1290: r = sendmsg(STDOUT_FILENO, &mh, 0);
1291: if (r == -1) {
1292: if (errno == EAGAIN || errno == EINTR) {
1293: if (poll(&pfd, 1, -1) == -1)
1294: err(1, "poll");
1295: continue;
1296: }
1297: err(1, "sendmsg");
1.128 tobias 1298: } else if (r != 1)
1.113 djm 1299: errx(1, "sendmsg: unexpected return value %zd", r);
1300: else
1301: break;
1302: }
1303: exit(0);
1.7 deraadt 1304: }
1.50 vincent 1305:
1.67 jmc 1306: /* Deal with RFC 854 WILL/WONT DO/DONT negotiation. */
1.21 ericj 1307: void
1.37 jakob 1308: atelnet(int nfd, unsigned char *buf, unsigned int size)
1.6 deraadt 1309: {
1.24 ericj 1310: unsigned char *p, *end;
1311: unsigned char obuf[4];
1312:
1.95 nicm 1313: if (size < 3)
1314: return;
1315: end = buf + size - 2;
1.24 ericj 1316:
1317: for (p = buf; p < end; p++) {
1.21 ericj 1318: if (*p != IAC)
1.95 nicm 1319: continue;
1.24 ericj 1320:
1.25 ericj 1321: obuf[0] = IAC;
1.24 ericj 1322: p++;
1.50 vincent 1323: if ((*p == WILL) || (*p == WONT))
1.24 ericj 1324: obuf[1] = DONT;
1.95 nicm 1325: else if ((*p == DO) || (*p == DONT))
1.24 ericj 1326: obuf[1] = WONT;
1.95 nicm 1327: else
1328: continue;
1329:
1330: p++;
1331: obuf[2] = *p;
1332: if (atomicio(vwrite, nfd, obuf, 3) != 3)
1333: warn("Write Error!");
1.11 ericj 1334: }
1.7 deraadt 1335: }
1336:
1.153 beck 1337:
1338: int
1339: strtoport(char *portstr, int udp)
1340: {
1341: struct servent *entry;
1342: const char *errstr;
1343: char *proto;
1344: int port = -1;
1345:
1346: proto = udp ? "udp" : "tcp";
1347:
1348: port = strtonum(portstr, 1, PORT_MAX, &errstr);
1349: if (errstr == NULL)
1350: return port;
1351: if (errno != EINVAL)
1352: errx(1, "port number %s: %s", errstr, portstr);
1353: if ((entry = getservbyname(portstr, proto)) == NULL)
1354: errx(1, "service \"%s\" unknown", portstr);
1355: return ntohs(entry->s_port);
1356: }
1357:
1.11 ericj 1358: /*
1.21 ericj 1359: * build_ports()
1.105 lum 1360: * Build an array of ports in portlist[], listing each port
1.67 jmc 1361: * that we should try to connect to.
1.11 ericj 1362: */
1.21 ericj 1363: void
1.37 jakob 1364: build_ports(char *p)
1.6 deraadt 1365: {
1.88 ray 1366: char *n;
1.21 ericj 1367: int hi, lo, cp;
1368: int x = 0;
1369:
1370: if ((n = strchr(p, '-')) != NULL) {
1371: *n = '\0';
1372: n++;
1373:
1.67 jmc 1374: /* Make sure the ports are in order: lowest->highest. */
1.153 beck 1375: hi = strtoport(n, uflag);
1376: lo = strtoport(p, uflag);
1.21 ericj 1377: if (lo > hi) {
1378: cp = hi;
1379: hi = lo;
1380: lo = cp;
1381: }
1382:
1.145 tb 1383: /*
1384: * Initialize portlist with a random permutation. Based on
1385: * Knuth, as in ip_randomid() in sys/netinet/ip_id.c.
1386: */
1.21 ericj 1387: if (rflag) {
1.145 tb 1388: for (x = 0; x <= hi - lo; x++) {
1389: cp = arc4random_uniform(x + 1);
1390: portlist[x] = portlist[cp];
1391: if (asprintf(&portlist[cp], "%d", x + lo) < 0)
1392: err(1, "asprintf");
1393: }
1394: } else { /* Load ports sequentially. */
1395: for (cp = lo; cp <= hi; cp++) {
1396: if (asprintf(&portlist[x], "%d", cp) < 0)
1397: err(1, "asprintf");
1398: x++;
1.6 deraadt 1399: }
1.11 ericj 1400: }
1.21 ericj 1401: } else {
1.153 beck 1402: char *tmp;
1403:
1404: hi = strtoport(p, uflag);
1405: if (asprintf(&tmp, "%d", hi) != -1)
1406: portlist[0] = tmp;
1407: else
1.55 fgsch 1408: err(1, NULL);
1.11 ericj 1409: }
1.13 ericj 1410: }
1411:
1412: /*
1.21 ericj 1413: * udptest()
1414: * Do a few writes to see if the UDP port is there.
1.105 lum 1415: * Fails once PF state table is full.
1.13 ericj 1416: */
1.21 ericj 1417: int
1.37 jakob 1418: udptest(int s)
1.13 ericj 1419: {
1.74 deraadt 1420: int i, ret;
1.13 ericj 1421:
1.52 vincent 1422: for (i = 0; i <= 3; i++) {
1.74 deraadt 1423: if (write(s, "X", 1) == 1)
1.21 ericj 1424: ret = 1;
1.14 ericj 1425: else
1.21 ericj 1426: ret = -1;
1.14 ericj 1427: }
1.21 ericj 1428: return (ret);
1.81 marius 1429: }
1430:
1.84 dtucker 1431: void
1.127 jca 1432: set_common_sockopts(int s, int af)
1.81 marius 1433: {
1434: int x = 1;
1435:
1436: if (Sflag) {
1437: if (setsockopt(s, IPPROTO_TCP, TCP_MD5SIG,
1438: &x, sizeof(x)) == -1)
1439: err(1, NULL);
1440: }
1441: if (Dflag) {
1442: if (setsockopt(s, SOL_SOCKET, SO_DEBUG,
1443: &x, sizeof(x)) == -1)
1444: err(1, NULL);
1445: }
1.83 dtucker 1446: if (Tflag != -1) {
1.157 bcook 1447: if (af == AF_INET && setsockopt(s, IPPROTO_IP,
1448: IP_TOS, &Tflag, sizeof(Tflag)) == -1)
1449: err(1, "set IP ToS");
1.127 jca 1450:
1.157 bcook 1451: else if (af == AF_INET6 && setsockopt(s, IPPROTO_IPV6,
1452: IPV6_TCLASS, &Tflag, sizeof(Tflag)) == -1)
1453: err(1, "set IPv6 traffic class");
1.83 dtucker 1454: }
1.90 djm 1455: if (Iflag) {
1456: if (setsockopt(s, SOL_SOCKET, SO_RCVBUF,
1457: &Iflag, sizeof(Iflag)) == -1)
1458: err(1, "set TCP receive buffer size");
1459: }
1460: if (Oflag) {
1461: if (setsockopt(s, SOL_SOCKET, SO_SNDBUF,
1462: &Oflag, sizeof(Oflag)) == -1)
1463: err(1, "set TCP send buffer size");
1464: }
1.157 bcook 1465:
1466: if (ttl != -1) {
1467: if (af == AF_INET && setsockopt(s, IPPROTO_IP,
1468: IP_TTL, &ttl, sizeof(ttl)))
1469: err(1, "set IP TTL");
1470:
1471: else if (af == AF_INET6 && setsockopt(s, IPPROTO_IPV6,
1472: IPV6_UNICAST_HOPS, &ttl, sizeof(ttl)))
1473: err(1, "set IPv6 unicast hops");
1474: }
1475:
1476: if (minttl != -1) {
1477: if (af == AF_INET && setsockopt(s, IPPROTO_IP,
1478: IP_MINTTL, &minttl, sizeof(minttl)))
1479: err(1, "set IP min TTL");
1480:
1481: else if (af == AF_INET6 && setsockopt(s, IPPROTO_IPV6,
1482: IPV6_MINHOPCOUNT, &minttl, sizeof(minttl)))
1483: err(1, "set IPv6 min hop count");
1.156 jca 1484: }
1.83 dtucker 1485: }
1486:
1487: int
1.102 haesbaer 1488: map_tos(char *s, int *val)
1.83 dtucker 1489: {
1.102 haesbaer 1490: /* DiffServ Codepoints and other TOS mappings */
1491: const struct toskeywords {
1492: const char *keyword;
1493: int val;
1494: } *t, toskeywords[] = {
1495: { "af11", IPTOS_DSCP_AF11 },
1496: { "af12", IPTOS_DSCP_AF12 },
1497: { "af13", IPTOS_DSCP_AF13 },
1498: { "af21", IPTOS_DSCP_AF21 },
1499: { "af22", IPTOS_DSCP_AF22 },
1500: { "af23", IPTOS_DSCP_AF23 },
1501: { "af31", IPTOS_DSCP_AF31 },
1502: { "af32", IPTOS_DSCP_AF32 },
1503: { "af33", IPTOS_DSCP_AF33 },
1504: { "af41", IPTOS_DSCP_AF41 },
1505: { "af42", IPTOS_DSCP_AF42 },
1506: { "af43", IPTOS_DSCP_AF43 },
1507: { "critical", IPTOS_PREC_CRITIC_ECP },
1508: { "cs0", IPTOS_DSCP_CS0 },
1509: { "cs1", IPTOS_DSCP_CS1 },
1510: { "cs2", IPTOS_DSCP_CS2 },
1511: { "cs3", IPTOS_DSCP_CS3 },
1512: { "cs4", IPTOS_DSCP_CS4 },
1513: { "cs5", IPTOS_DSCP_CS5 },
1514: { "cs6", IPTOS_DSCP_CS6 },
1515: { "cs7", IPTOS_DSCP_CS7 },
1516: { "ef", IPTOS_DSCP_EF },
1517: { "inetcontrol", IPTOS_PREC_INTERNETCONTROL },
1518: { "lowdelay", IPTOS_LOWDELAY },
1519: { "netcontrol", IPTOS_PREC_NETCONTROL },
1520: { "reliability", IPTOS_RELIABILITY },
1521: { "throughput", IPTOS_THROUGHPUT },
1.134 deraadt 1522: { NULL, -1 },
1.102 haesbaer 1523: };
1524:
1525: for (t = toskeywords; t->keyword != NULL; t++) {
1526: if (strcmp(s, t->keyword) == 0) {
1527: *val = t->val;
1528: return (1);
1529: }
1530: }
1.83 dtucker 1531:
1.102 haesbaer 1532: return (0);
1.108 haesbaer 1533: }
1534:
1.133 beck 1535: int
1536: map_tls(char *s, int *val)
1537: {
1538: const struct tlskeywords {
1539: const char *keyword;
1540: int val;
1541: } *t, tlskeywords[] = {
1.170 beck 1542: { "tlsall", TLS_ALL },
1.133 beck 1543: { "noverify", TLS_NOVERIFY },
1544: { "noname", TLS_NONAME },
1545: { "clientcert", TLS_CCERT},
1.167 beck 1546: { "muststaple", TLS_MUSTSTAPLE},
1.134 deraadt 1547: { NULL, -1 },
1.133 beck 1548: };
1549:
1550: for (t = tlskeywords; t->keyword != NULL; t++) {
1551: if (strcmp(s, t->keyword) == 0) {
1552: *val |= t->val;
1553: return (1);
1554: }
1555: }
1556: return (0);
1557: }
1558:
1559: void
1560: report_tls(struct tls * tls_ctx, char * host, char *tls_expectname)
1561: {
1.147 beck 1562: time_t t;
1.164 beck 1563: const char *ocsp_url;
1564:
1.138 beck 1565: fprintf(stderr, "TLS handshake negotiated %s/%s with host %s\n",
1566: tls_conn_version(tls_ctx), tls_conn_cipher(tls_ctx), host);
1.148 mmcc 1567: fprintf(stderr, "Peer name: %s\n",
1.133 beck 1568: tls_expectname ? tls_expectname : host);
1.137 beck 1569: if (tls_peer_cert_subject(tls_ctx))
1570: fprintf(stderr, "Subject: %s\n",
1571: tls_peer_cert_subject(tls_ctx));
1572: if (tls_peer_cert_issuer(tls_ctx))
1573: fprintf(stderr, "Issuer: %s\n",
1574: tls_peer_cert_issuer(tls_ctx));
1.147 beck 1575: if ((t = tls_peer_cert_notbefore(tls_ctx)) != -1)
1576: fprintf(stderr, "Valid From: %s", ctime(&t));
1577: if ((t = tls_peer_cert_notafter(tls_ctx)) != -1)
1578: fprintf(stderr, "Valid Until: %s", ctime(&t));
1.137 beck 1579: if (tls_peer_cert_hash(tls_ctx))
1580: fprintf(stderr, "Cert Hash: %s\n",
1581: tls_peer_cert_hash(tls_ctx));
1.164 beck 1582: ocsp_url = tls_peer_ocsp_url(tls_ctx);
1.166 beck 1583: if (ocsp_url != NULL)
1584: fprintf(stderr, "OCSP URL: %s\n", ocsp_url);
1.164 beck 1585: switch (tls_peer_ocsp_response_status(tls_ctx)) {
1586: case TLS_OCSP_RESPONSE_SUCCESSFUL:
1.165 beck 1587: fprintf(stderr, "OCSP Stapling: %s\n",
1.164 beck 1588: tls_peer_ocsp_result(tls_ctx) == NULL ? "" :
1589: tls_peer_ocsp_result(tls_ctx));
1590: fprintf(stderr,
1591: " response_status=%d cert_status=%d crl_reason=%d\n",
1592: tls_peer_ocsp_response_status(tls_ctx),
1593: tls_peer_ocsp_cert_status(tls_ctx),
1594: tls_peer_ocsp_crl_reason(tls_ctx));
1595: t = tls_peer_ocsp_this_update(tls_ctx);
1596: fprintf(stderr, " this update: %s",
1597: t != -1 ? ctime(&t) : "\n");
1598: t = tls_peer_ocsp_next_update(tls_ctx);
1599: fprintf(stderr, " next update: %s",
1600: t != -1 ? ctime(&t) : "\n");
1601: t = tls_peer_ocsp_revocation_time(tls_ctx);
1602: fprintf(stderr, " revocation: %s",
1603: t != -1 ? ctime(&t) : "\n");
1604: break;
1605: case -1:
1606: break;
1607: default:
1.165 beck 1608: fprintf(stderr, "OCSP Stapling: failure - response_status %d (%s)\n",
1.164 beck 1609: tls_peer_ocsp_response_status(tls_ctx),
1610: tls_peer_ocsp_result(tls_ctx) == NULL ? "" :
1611: tls_peer_ocsp_result(tls_ctx));
1612: break;
1613:
1614: }
1.133 beck 1615: }
1.147 beck 1616:
1.108 haesbaer 1617: void
1.151 beck 1618: report_connect(const struct sockaddr *sa, socklen_t salen, char *path)
1.108 haesbaer 1619: {
1620: char remote_host[NI_MAXHOST];
1621: char remote_port[NI_MAXSERV];
1622: int herr;
1623: int flags = NI_NUMERICSERV;
1.151 beck 1624:
1625: if (path != NULL) {
1626: fprintf(stderr, "Connection on %s received!\n", path);
1627: return;
1628: }
1.134 deraadt 1629:
1.108 haesbaer 1630: if (nflag)
1631: flags |= NI_NUMERICHOST;
1.134 deraadt 1632:
1.108 haesbaer 1633: if ((herr = getnameinfo(sa, salen,
1634: remote_host, sizeof(remote_host),
1635: remote_port, sizeof(remote_port),
1636: flags)) != 0) {
1637: if (herr == EAI_SYSTEM)
1638: err(1, "getnameinfo");
1639: else
1640: errx(1, "getnameinfo: %s", gai_strerror(herr));
1641: }
1.134 deraadt 1642:
1.108 haesbaer 1643: fprintf(stderr,
1644: "Connection from %s %s "
1645: "received!\n", remote_host, remote_port);
1.7 deraadt 1646: }
1.1 deraadt 1647:
1.11 ericj 1648: void
1.58 deraadt 1649: help(void)
1.1 deraadt 1650: {
1.21 ericj 1651: usage(0);
1652: fprintf(stderr, "\tCommand Summary:\n\
1653: \t-4 Use IPv4\n\
1654: \t-6 Use IPv6\n\
1.135 jmc 1655: \t-C certfile Public key file\n\
1656: \t-c Use TLS\n\
1.73 markus 1657: \t-D Enable the debug socket option\n\
1.69 tedu 1658: \t-d Detach from stdin\n\
1.135 jmc 1659: \t-e name\t Required name in peer certificate\n\
1.114 jmc 1660: \t-F Pass socket fd\n\
1.135 jmc 1661: \t-H hash\t Hash string of peer certificate\n\
1.21 ericj 1662: \t-h This help text\n\
1.90 djm 1663: \t-I length TCP receive buffer length\n\
1.135 jmc 1664: \t-i interval Delay interval for lines sent, ports scanned\n\
1665: \t-K keyfile Private key file\n\
1.21 ericj 1666: \t-k Keep inbound sockets open for multiple connects\n\
1667: \t-l Listen mode, for inbound connects\n\
1.156 jca 1668: \t-M ttl Outgoing TTL / Hop Limit\n\
1669: \t-m minttl Minimum incoming TTL / Hop Limit\n\
1.111 sthen 1670: \t-N Shutdown the network socket after EOF on stdin\n\
1.22 jasoni 1671: \t-n Suppress name/port resolutions\n\
1.90 djm 1672: \t-O length TCP send buffer length\n\
1.169 jmc 1673: \t-o staplefile Staple file\n\
1.86 djm 1674: \t-P proxyuser\tUsername for proxy authentication\n\
1.36 jakob 1675: \t-p port\t Specify local port for remote connects\n\
1.135 jmc 1676: \t-R CAfile CA bundle\n\
1.21 ericj 1677: \t-r Randomize remote ports\n\
1.67 jmc 1678: \t-S Enable the TCP MD5 signature option\n\
1.135 jmc 1679: \t-s source Local source address\n\
1680: \t-T keyword TOS value or TLS options\n\
1.21 ericj 1681: \t-t Answer TELNET negotiation\n\
1.67 jmc 1682: \t-U Use UNIX domain socket\n\
1.21 ericj 1683: \t-u UDP mode\n\
1.98 guenther 1684: \t-V rtable Specify alternate routing table\n\
1.21 ericj 1685: \t-v Verbose\n\
1.135 jmc 1686: \t-w timeout Timeout for connects and final net reads\n\
1.75 djm 1687: \t-X proto Proxy protocol: \"4\", \"5\" (SOCKS) or \"connect\"\n\
1688: \t-x addr[:port]\tSpecify proxy address and port\n\
1.21 ericj 1689: \t-z Zero-I/O mode [used for scanning]\n\
1690: Port numbers can be individual or ranges: lo-hi [inclusive]\n");
1691: exit(1);
1.11 ericj 1692: }
1693:
1694: void
1.37 jakob 1695: usage(int ret)
1.11 ericj 1696: {
1.92 sobrado 1697: fprintf(stderr,
1.135 jmc 1698: "usage: nc [-46cDdFhklNnrStUuvz] [-C certfile] [-e name] "
1699: "[-H hash] [-I length]\n"
1.156 jca 1700: "\t [-i interval] [-K keyfile] [-M ttl] [-m minttl] [-O length]\n"
1.169 jmc 1701: "\t [-o staplefile] [-P proxy_username] [-p source_port] "
1702: "[-R CAfile]\n"
1703: "\t [-s source] [-T keyword] [-V rtable] [-w timeout] "
1704: "[-X proxy_protocol]\n"
1.156 jca 1705: "\t [-x proxy_address[:port]] [destination] [port]\n");
1.21 ericj 1706: if (ret)
1707: exit(1);
1.7 deraadt 1708: }
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