Annotation of src/usr.bin/nc/netcat.c, Revision 1.145
1.145 ! tb 1: /* $OpenBSD: netcat.c,v 1.144 2015/11/23 01:23:56 bcook 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>
1.7 deraadt 37: #include <sys/time.h>
1.113 djm 38: #include <sys/uio.h>
1.42 ericj 39: #include <sys/un.h>
1.21 ericj 40:
1.7 deraadt 41: #include <netinet/in.h>
1.65 markus 42: #include <netinet/tcp.h>
1.83 dtucker 43: #include <netinet/ip.h>
1.21 ericj 44: #include <arpa/telnet.h>
1.29 smart 45:
1.11 ericj 46: #include <err.h>
1.7 deraadt 47: #include <errno.h>
1.129 tobias 48: #include <limits.h>
1.21 ericj 49: #include <netdb.h>
50: #include <poll.h>
1.129 tobias 51: #include <signal.h>
1.13 ericj 52: #include <stdarg.h>
1.21 ericj 53: #include <stdio.h>
1.1 deraadt 54: #include <stdlib.h>
1.21 ericj 55: #include <string.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
1.133 beck 68: #define DEFAULT_CA_FILE "/etc/ssl/cert.pem"
69:
70: #define TLS_LEGACY (1 << 1)
71: #define TLS_NOVERIFY (1 << 2)
72: #define TLS_NONAME (1 << 3)
73: #define TLS_CCERT (1 << 4)
1.125 tedu 74:
1.21 ericj 75: /* Command Line Options */
1.68 tedu 76: int dflag; /* detached, no stdin */
1.113 djm 77: int Fflag; /* fdpass sock to stdout */
1.88 ray 78: unsigned int iflag; /* Interval Flag */
1.21 ericj 79: int kflag; /* More than one connect */
80: int lflag; /* Bind to local port */
1.111 sthen 81: int Nflag; /* shutdown() network socket */
1.67 jmc 82: int nflag; /* Don't do name look up */
1.86 djm 83: char *Pflag; /* Proxy username */
1.21 ericj 84: char *pflag; /* Localport flag */
85: int rflag; /* Random ports flag */
86: char *sflag; /* Source Address */
87: int tflag; /* Telnet Emulation */
88: int uflag; /* UDP - Default to TCP */
89: int vflag; /* Verbosity */
1.34 jakob 90: int xflag; /* Socks proxy */
1.21 ericj 91: int zflag; /* Port Scan Flag */
1.73 markus 92: int Dflag; /* sodebug */
1.90 djm 93: int Iflag; /* TCP receive buffer size */
94: int Oflag; /* TCP send buffer size */
1.65 markus 95: int Sflag; /* TCP MD5 signature option */
1.83 dtucker 96: int Tflag = -1; /* IP Type of Service */
1.117 sthen 97: int rtableid = -1;
1.21 ericj 98:
1.133 beck 99: int usetls; /* use TLS */
100: char *Cflag; /* Public cert file */
101: char *Kflag; /* Private key file */
102: char *Rflag = DEFAULT_CA_FILE; /* Root CA file */
103: int tls_cachanged; /* Using non-default CA file */
104: int TLSopt; /* TLS options */
105: char *tls_expectname; /* required name in peer cert */
106: char *tls_expecthash; /* required hash of peer cert */
107:
1.49 hugh 108: int timeout = -1;
1.21 ericj 109: int family = AF_UNSPEC;
1.63 miod 110: char *portlist[PORT_MAX+1];
1.99 jeremy 111: char *unix_dg_tmp_socket;
1.21 ericj 112:
1.40 millert 113: void atelnet(int, unsigned char *, unsigned int);
114: void build_ports(char *);
115: void help(void);
116: int local_listen(char *, char *, struct addrinfo);
1.133 beck 117: void readwrite(int, struct tls *);
1.113 djm 118: void fdpass(int nfd) __attribute__((noreturn));
1.77 otto 119: int remote_connect(const char *, const char *, struct addrinfo);
1.103 fgsch 120: int timeout_connect(int, const struct sockaddr *, socklen_t);
1.86 djm 121: int socks_connect(const char *, const char *, struct addrinfo,
122: const char *, const char *, struct addrinfo, int, const char *);
1.40 millert 123: int udptest(int);
1.136 deraadt 124: int unix_bind(char *, int);
1.42 ericj 125: int unix_connect(char *);
126: int unix_listen(char *);
1.127 jca 127: void set_common_sockopts(int, int);
1.102 haesbaer 128: int map_tos(char *, int *);
1.133 beck 129: int map_tls(char *, int *);
1.108 haesbaer 130: void report_connect(const struct sockaddr *, socklen_t);
1.134 deraadt 131: void report_tls(struct tls *tls_ctx, char * host, char *tls_expectname);
1.40 millert 132: void usage(int);
1.133 beck 133: ssize_t drainbuf(int, unsigned char *, size_t *, struct tls *);
134: ssize_t fillbuf(int, unsigned char *, size_t *, struct tls *);
135: void tls_setup_client(struct tls *, int, char *);
1.134 deraadt 136: struct tls *tls_setup_server(struct tls *, int, char *);
1.1 deraadt 137:
1.21 ericj 138: int
1.37 jakob 139: main(int argc, char *argv[])
1.21 ericj 140: {
1.46 markus 141: int ch, s, ret, socksv;
1.88 ray 142: char *host, *uport;
1.21 ericj 143: struct addrinfo hints;
1.29 smart 144: struct servent *sv;
1.21 ericj 145: socklen_t len;
1.76 hshoexer 146: struct sockaddr_storage cliaddr;
1.34 jakob 147: char *proxy;
1.88 ray 148: const char *errstr, *proxyhost = "", *proxyport = NULL;
1.34 jakob 149: struct addrinfo proxyhints;
1.99 jeremy 150: char unix_dg_tmp_socket_buf[UNIX_DG_TMP_SOCKET_SIZE];
1.133 beck 151: struct tls_config *tls_cfg = NULL;
152: struct tls *tls_ctx = NULL;
1.11 ericj 153:
1.29 smart 154: ret = 1;
155: s = 0;
1.46 markus 156: socksv = 5;
1.29 smart 157: host = NULL;
158: uport = NULL;
159: sv = NULL;
1.129 tobias 160:
161: signal(SIGPIPE, SIG_IGN);
1.29 smart 162:
1.80 mcbride 163: while ((ch = getopt(argc, argv,
1.133 beck 164: "46C:cDde:FH:hI:i:K:klNnO:P:p:R:rSs:T:tUuV:vw:X:x:z")) != -1) {
1.21 ericj 165: switch (ch) {
166: case '4':
167: family = AF_INET;
168: break;
169: case '6':
170: family = AF_INET6;
171: break;
1.42 ericj 172: case 'U':
173: family = AF_UNIX;
174: break;
1.46 markus 175: case 'X':
1.75 djm 176: if (strcasecmp(optarg, "connect") == 0)
177: socksv = -1; /* HTTP proxy CONNECT */
178: else if (strcmp(optarg, "4") == 0)
179: socksv = 4; /* SOCKS v.4 */
180: else if (strcmp(optarg, "5") == 0)
181: socksv = 5; /* SOCKS v.5 */
182: else
183: errx(1, "unsupported proxy protocol");
1.46 markus 184: break;
1.133 beck 185: case 'C':
186: Cflag = optarg;
187: break;
188: case 'c':
189: usetls = 1;
190: break;
1.68 tedu 191: case 'd':
192: dflag = 1;
193: break;
1.133 beck 194: case 'e':
195: tls_expectname = optarg;
196: break;
1.113 djm 197: case 'F':
198: Fflag = 1;
199: break;
1.133 beck 200: case 'H':
201: tls_expecthash = optarg;
202: break;
1.21 ericj 203: case 'h':
204: help();
205: break;
206: case 'i':
1.88 ray 207: iflag = strtonum(optarg, 0, UINT_MAX, &errstr);
208: if (errstr)
209: errx(1, "interval %s: %s", errstr, optarg);
1.21 ericj 210: break;
1.133 beck 211: case 'K':
212: Kflag = optarg;
213: break;
1.21 ericj 214: case 'k':
215: kflag = 1;
216: break;
217: case 'l':
218: lflag = 1;
219: break;
1.111 sthen 220: case 'N':
221: Nflag = 1;
222: break;
1.21 ericj 223: case 'n':
224: nflag = 1;
225: break;
1.86 djm 226: case 'P':
227: Pflag = optarg;
228: break;
1.21 ericj 229: case 'p':
230: pflag = optarg;
231: break;
1.133 beck 232: case 'R':
233: tls_cachanged = 1;
234: Rflag = optarg;
235: break;
1.21 ericj 236: case 'r':
237: rflag = 1;
238: break;
239: case 's':
240: sflag = optarg;
241: break;
242: case 't':
243: tflag = 1;
244: break;
245: case 'u':
246: uflag = 1;
247: break;
1.93 claudio 248: case 'V':
1.117 sthen 249: rtableid = (int)strtonum(optarg, 0,
1.93 claudio 250: RT_TABLEID_MAX, &errstr);
251: if (errstr)
1.98 guenther 252: errx(1, "rtable %s: %s", errstr, optarg);
1.93 claudio 253: break;
1.21 ericj 254: case 'v':
255: vflag = 1;
256: break;
1.70 deraadt 257: case 'w':
1.88 ray 258: timeout = strtonum(optarg, 0, INT_MAX / 1000, &errstr);
259: if (errstr)
260: errx(1, "timeout %s: %s", errstr, optarg);
1.49 hugh 261: timeout *= 1000;
1.21 ericj 262: break;
1.34 jakob 263: case 'x':
264: xflag = 1;
1.64 deraadt 265: if ((proxy = strdup(optarg)) == NULL)
266: err(1, NULL);
1.34 jakob 267: break;
1.21 ericj 268: case 'z':
269: zflag = 1;
270: break;
1.73 markus 271: case 'D':
272: Dflag = 1;
273: break;
1.90 djm 274: case 'I':
275: Iflag = strtonum(optarg, 1, 65536 << 14, &errstr);
276: if (errstr != NULL)
277: errx(1, "TCP receive window %s: %s",
278: errstr, optarg);
279: break;
280: case 'O':
281: Oflag = strtonum(optarg, 1, 65536 << 14, &errstr);
282: if (errstr != NULL)
283: errx(1, "TCP send window %s: %s",
284: errstr, optarg);
285: break;
1.65 markus 286: case 'S':
287: Sflag = 1;
288: break;
1.83 dtucker 289: case 'T':
1.102 haesbaer 290: errstr = NULL;
291: errno = 0;
292: if (map_tos(optarg, &Tflag))
293: break;
1.133 beck 294: if (map_tls(optarg, &TLSopt))
295: break;
1.102 haesbaer 296: if (strlen(optarg) > 1 && optarg[0] == '0' &&
297: optarg[1] == 'x')
298: Tflag = (int)strtol(optarg, NULL, 16);
299: else
300: Tflag = (int)strtonum(optarg, 0, 255,
301: &errstr);
302: if (Tflag < 0 || Tflag > 255 || errstr || errno)
1.133 beck 303: errx(1, "illegal tos/tls value %s", optarg);
1.83 dtucker 304: break;
1.21 ericj 305: default:
306: usage(1);
307: }
308: }
309: argc -= optind;
310: argv += optind;
1.11 ericj 311:
1.143 deraadt 312: if (rtableid >= 0)
1.142 benno 313: if (setrtable(rtableid) == -1)
314: err(1, "setrtable");
1.143 deraadt 315:
1.142 benno 316: if (family == AF_UNIX) {
1.140 beck 317: if (pledge("stdio rpath wpath cpath tmppath unix", NULL) == -1)
318: err(1, "pledge");
1.143 deraadt 319: } else if (Fflag) {
1.140 beck 320: if (pledge("stdio inet dns sendfd", NULL) == -1)
321: err(1, "pledge");
1.143 deraadt 322: } else if (usetls) {
1.140 beck 323: if (pledge("stdio rpath inet dns", NULL) == -1)
324: err(1, "pledge");
1.143 deraadt 325: } else if (pledge("stdio inet dns", NULL) == -1)
1.140 beck 326: err(1, "pledge");
327:
1.21 ericj 328: /* Cruft to make sure options are clean, and used properly. */
1.42 ericj 329: if (argv[0] && !argv[1] && family == AF_UNIX) {
330: host = argv[0];
331: uport = NULL;
332: } else if (argv[0] && !argv[1]) {
1.21 ericj 333: if (!lflag)
334: usage(1);
335: uport = argv[0];
336: host = NULL;
337: } else if (argv[0] && argv[1]) {
338: host = argv[0];
339: uport = argv[1];
340: } else
341: usage(1);
1.1 deraadt 342:
1.21 ericj 343: if (lflag && sflag)
344: errx(1, "cannot use -s and -l");
345: if (lflag && pflag)
346: errx(1, "cannot use -p and -l");
347: if (lflag && zflag)
1.32 ericj 348: errx(1, "cannot use -z and -l");
1.21 ericj 349: if (!lflag && kflag)
1.32 ericj 350: errx(1, "must use -l with -k");
1.133 beck 351: if (uflag && usetls)
352: errx(1, "cannot use -c and -u");
353: if ((family == AF_UNIX) && usetls)
354: errx(1, "cannot use -c and -U");
1.140 beck 355: if ((family == AF_UNIX) && Fflag)
356: errx(1, "cannot use -F and -U");
357: if (Fflag && usetls)
358: errx(1, "cannot use -c and -F");
1.133 beck 359: if (TLSopt && !usetls)
360: errx(1, "you must specify -c to use TLS options");
361: if (Cflag && !usetls)
362: errx(1, "you must specify -c to use -C");
363: if (Kflag && !usetls)
364: errx(1, "you must specify -c to use -K");
365: if (tls_cachanged && !usetls)
366: errx(1, "you must specify -c to use -R");
367: if (tls_expecthash && !usetls)
368: errx(1, "you must specify -c to use -H");
369: if (tls_expectname && !usetls)
370: errx(1, "you must specify -c to use -e");
1.21 ericj 371:
1.99 jeremy 372: /* Get name of temporary socket for unix datagram client */
373: if ((family == AF_UNIX) && uflag && !lflag) {
374: if (sflag) {
375: unix_dg_tmp_socket = sflag;
376: } else {
377: strlcpy(unix_dg_tmp_socket_buf, "/tmp/nc.XXXXXXXXXX",
1.136 deraadt 378: UNIX_DG_TMP_SOCKET_SIZE);
1.99 jeremy 379: if (mktemp(unix_dg_tmp_socket_buf) == NULL)
380: err(1, "mktemp");
381: unix_dg_tmp_socket = unix_dg_tmp_socket_buf;
382: }
383: }
384:
1.67 jmc 385: /* Initialize addrinfo structure. */
1.42 ericj 386: if (family != AF_UNIX) {
387: memset(&hints, 0, sizeof(struct addrinfo));
388: hints.ai_family = family;
389: hints.ai_socktype = uflag ? SOCK_DGRAM : SOCK_STREAM;
390: hints.ai_protocol = uflag ? IPPROTO_UDP : IPPROTO_TCP;
391: if (nflag)
392: hints.ai_flags |= AI_NUMERICHOST;
393: }
1.1 deraadt 394:
1.34 jakob 395: if (xflag) {
396: if (uflag)
397: errx(1, "no proxy support for UDP mode");
398:
399: if (lflag)
400: errx(1, "no proxy support for listen");
401:
1.42 ericj 402: if (family == AF_UNIX)
403: errx(1, "no proxy support for unix sockets");
404:
1.34 jakob 405: /* XXX IPv6 transport to proxy would probably work */
406: if (family == AF_INET6)
407: errx(1, "no proxy support for IPv6");
408:
409: if (sflag)
410: errx(1, "no proxy support for local source address");
411:
412: proxyhost = strsep(&proxy, ":");
413: proxyport = proxy;
414:
415: memset(&proxyhints, 0, sizeof(struct addrinfo));
416: proxyhints.ai_family = family;
417: proxyhints.ai_socktype = SOCK_STREAM;
418: proxyhints.ai_protocol = IPPROTO_TCP;
419: if (nflag)
420: proxyhints.ai_flags |= AI_NUMERICHOST;
421: }
422:
1.133 beck 423: if (usetls) {
424: if (tls_init() == -1)
425: errx(1, "unable to initialize TLS");
426: if ((tls_cfg = tls_config_new()) == NULL)
427: errx(1, "unable to allocate TLS config");
428: if (Cflag && (tls_config_set_cert_file(tls_cfg, Cflag) == -1))
429: errx(1, "unable to set TLS certificate file %s", Cflag);
430: if (Kflag && (tls_config_set_key_file(tls_cfg, Kflag) == -1))
431: errx(1, "unable to set TLS key file %s", Kflag);
432: if (Rflag && (tls_config_set_ca_file(tls_cfg, Rflag) == -1))
433: errx(1, "unable to set root CA file %s", Rflag);
434: if (TLSopt & TLS_LEGACY) {
435: tls_config_set_protocols(tls_cfg, TLS_PROTOCOLS_ALL);
436: tls_config_set_ciphers(tls_cfg, "legacy");
437: }
438: if (!lflag && (TLSopt & TLS_CCERT))
439: errx(1, "clientcert is only valid with -l");
440: if (TLSopt & TLS_NONAME)
441: tls_config_insecure_noverifyname(tls_cfg);
442: if (TLSopt & TLS_NOVERIFY) {
443: if (tls_expecthash != NULL)
444: errx(1, "-H and -T noverify may not be used"
445: "together");
446: tls_config_insecure_noverifycert(tls_cfg);
447: }
448: }
1.21 ericj 449: if (lflag) {
1.133 beck 450: struct tls *tls_cctx = NULL;
1.21 ericj 451: int connfd;
1.27 ericj 452: ret = 0;
1.1 deraadt 453:
1.99 jeremy 454: if (family == AF_UNIX) {
455: if (uflag)
1.136 deraadt 456: s = unix_bind(host, 0);
1.99 jeremy 457: else
458: s = unix_listen(host);
459: }
1.42 ericj 460:
1.133 beck 461: if (usetls) {
462: tls_config_verify_client_optional(tls_cfg);
463: if ((tls_ctx = tls_server()) == NULL)
464: errx(1, "tls server creation failed");
465: if (tls_configure(tls_ctx, tls_cfg) == -1)
466: errx(1, "tls configuration failed (%s)",
467: tls_error(tls_ctx));
468: }
1.67 jmc 469: /* Allow only one connection at a time, but stay alive. */
1.21 ericj 470: for (;;) {
1.42 ericj 471: if (family != AF_UNIX)
472: s = local_listen(host, uport, hints);
473: if (s < 0)
1.30 smart 474: err(1, NULL);
1.21 ericj 475: /*
1.109 haesbaer 476: * For UDP and -k, don't connect the socket, let it
477: * receive datagrams from multiple socket pairs.
1.21 ericj 478: */
1.109 haesbaer 479: if (uflag && kflag)
1.133 beck 480: readwrite(s, NULL);
1.109 haesbaer 481: /*
482: * For UDP and not -k, we will use recvfrom() initially
483: * to wait for a caller, then use the regular functions
484: * to talk to the caller.
485: */
486: else if (uflag && !kflag) {
1.80 mcbride 487: int rv, plen;
1.97 nicm 488: char buf[16384];
1.21 ericj 489: struct sockaddr_storage z;
490:
491: len = sizeof(z);
1.106 dlg 492: plen = 2048;
1.80 mcbride 493: rv = recvfrom(s, buf, plen, MSG_PEEK,
1.37 jakob 494: (struct sockaddr *)&z, &len);
1.23 ericj 495: if (rv < 0)
1.57 stevesk 496: err(1, "recvfrom");
1.21 ericj 497:
1.37 jakob 498: rv = connect(s, (struct sockaddr *)&z, len);
1.23 ericj 499: if (rv < 0)
1.57 stevesk 500: err(1, "connect");
1.1 deraadt 501:
1.108 haesbaer 502: if (vflag)
503: report_connect((struct sockaddr *)&z, len);
504:
1.133 beck 505: readwrite(s, NULL);
1.21 ericj 506: } else {
1.78 otto 507: len = sizeof(cliaddr);
1.132 bluhm 508: connfd = accept4(s, (struct sockaddr *)&cliaddr,
509: &len, SOCK_NONBLOCK);
1.110 deraadt 510: if (connfd == -1) {
511: /* For now, all errnos are fatal */
1.125 tedu 512: err(1, "accept");
1.110 deraadt 513: }
1.108 haesbaer 514: if (vflag)
515: report_connect((struct sockaddr *)&cliaddr, len);
1.133 beck 516: if ((usetls) &&
1.134 deraadt 517: (tls_cctx = tls_setup_server(tls_ctx, connfd, host)))
1.133 beck 518: readwrite(connfd, tls_cctx);
519: if (!usetls)
520: readwrite(connfd, NULL);
521: if (tls_cctx) {
522: int i;
1.136 deraadt 523:
1.133 beck 524: do {
525: i = tls_close(tls_cctx);
526: } while (i == TLS_WANT_POLLIN ||
527: i == TLS_WANT_POLLOUT);
528: tls_free(tls_cctx);
529: tls_cctx = NULL;
530: }
1.99 jeremy 531: close(connfd);
1.21 ericj 532: }
1.42 ericj 533: if (family != AF_UNIX)
534: close(s);
1.99 jeremy 535: else if (uflag) {
536: if (connect(s, NULL, 0) < 0)
537: err(1, "connect");
538: }
1.27 ericj 539:
1.21 ericj 540: if (!kflag)
541: break;
1.11 ericj 542: }
1.42 ericj 543: } else if (family == AF_UNIX) {
544: ret = 0;
545:
546: if ((s = unix_connect(host)) > 0 && !zflag) {
1.133 beck 547: readwrite(s, NULL);
1.42 ericj 548: close(s);
549: } else
550: ret = 1;
551:
1.99 jeremy 552: if (uflag)
553: unlink(unix_dg_tmp_socket);
1.42 ericj 554: exit(ret);
555:
1.21 ericj 556: } else {
557: int i = 0;
1.6 deraadt 558:
1.67 jmc 559: /* Construct the portlist[] array. */
1.21 ericj 560: build_ports(uport);
1.1 deraadt 561:
1.67 jmc 562: /* Cycle through portlist, connecting to each port. */
1.21 ericj 563: for (i = 0; portlist[i] != NULL; i++) {
564: if (s)
565: close(s);
1.34 jakob 566:
1.133 beck 567: if (usetls) {
568: if ((tls_ctx = tls_client()) == NULL)
569: errx(1, "tls client creation failed");
570: if (tls_configure(tls_ctx, tls_cfg) == -1)
571: errx(1, "tls configuration failed (%s)",
572: tls_error(tls_ctx));
573: }
1.34 jakob 574: if (xflag)
575: s = socks_connect(host, portlist[i], hints,
1.86 djm 576: proxyhost, proxyport, proxyhints, socksv,
577: Pflag);
1.34 jakob 578: else
579: s = remote_connect(host, portlist[i], hints);
580:
581: if (s < 0)
1.21 ericj 582: continue;
1.1 deraadt 583:
1.21 ericj 584: ret = 0;
585: if (vflag || zflag) {
1.67 jmc 586: /* For UDP, make sure we are connected. */
1.21 ericj 587: if (uflag) {
1.50 vincent 588: if (udptest(s) == -1) {
1.21 ericj 589: ret = 1;
590: continue;
591: }
592: }
1.1 deraadt 593:
1.67 jmc 594: /* Don't look up port if -n. */
1.21 ericj 595: if (nflag)
596: sv = NULL;
597: else {
598: sv = getservbyport(
1.37 jakob 599: ntohs(atoi(portlist[i])),
600: uflag ? "udp" : "tcp");
1.21 ericj 601: }
1.50 vincent 602:
1.94 mpf 603: fprintf(stderr,
604: "Connection to %s %s port [%s/%s] "
605: "succeeded!\n", host, portlist[i],
606: uflag ? "udp" : "tcp",
1.37 jakob 607: sv ? sv->s_name : "*");
1.21 ericj 608: }
1.113 djm 609: if (Fflag)
610: fdpass(s);
1.133 beck 611: else {
612: if (usetls)
613: tls_setup_client(tls_ctx, s, host);
614: if (!zflag)
615: readwrite(s, tls_ctx);
616: if (tls_ctx) {
617: int j;
1.136 deraadt 618:
1.133 beck 619: do {
620: j = tls_close(tls_ctx);
621: } while (j == TLS_WANT_POLLIN ||
622: j == TLS_WANT_POLLOUT);
623: tls_free(tls_ctx);
624: tls_ctx = NULL;
625: }
626: }
1.7 deraadt 627: }
1.11 ericj 628: }
1.1 deraadt 629:
1.21 ericj 630: if (s)
631: close(s);
632:
1.133 beck 633: tls_config_free(tls_cfg);
634:
1.21 ericj 635: exit(ret);
1.7 deraadt 636: }
1.1 deraadt 637:
1.11 ericj 638: /*
1.99 jeremy 639: * unix_bind()
640: * Returns a unix socket bound to the given path
1.42 ericj 641: */
642: int
1.136 deraadt 643: unix_bind(char *path, int flags)
1.42 ericj 644: {
1.144 bcook 645: struct sockaddr_un s_un;
1.42 ericj 646: int s;
647:
1.99 jeremy 648: /* Create unix domain socket. */
1.136 deraadt 649: if ((s = socket(AF_UNIX, flags | (uflag ? SOCK_DGRAM : SOCK_STREAM),
650: 0)) < 0)
1.50 vincent 651: return (-1);
1.42 ericj 652:
1.144 bcook 653: memset(&s_un, 0, sizeof(struct sockaddr_un));
654: s_un.sun_family = AF_UNIX;
1.60 avsm 655:
1.144 bcook 656: if (strlcpy(s_un.sun_path, path, sizeof(s_un.sun_path)) >=
657: sizeof(s_un.sun_path)) {
1.60 avsm 658: close(s);
659: errno = ENAMETOOLONG;
660: return (-1);
661: }
1.99 jeremy 662:
1.144 bcook 663: if (bind(s, (struct sockaddr *)&s_un, sizeof(s_un)) < 0) {
1.50 vincent 664: close(s);
665: return (-1);
1.42 ericj 666: }
667: return (s);
668: }
669:
1.133 beck 670: void
671: tls_setup_client(struct tls *tls_ctx, int s, char *host)
672: {
673: int i;
1.136 deraadt 674:
1.133 beck 675: if (tls_connect_socket(tls_ctx, s,
676: tls_expectname ? tls_expectname : host) == -1) {
677: errx(1, "tls connection failed (%s)",
678: tls_error(tls_ctx));
679: }
680: do {
681: if ((i = tls_handshake(tls_ctx)) == -1)
682: errx(1, "tls handshake failed (%s)",
683: tls_error(tls_ctx));
684: } while (i == TLS_WANT_POLLIN || i == TLS_WANT_POLLOUT);
685: if (vflag)
686: report_tls(tls_ctx, host, tls_expectname);
1.137 beck 687: if (tls_expecthash && tls_peer_cert_hash(tls_ctx) &&
688: strcmp(tls_expecthash, tls_peer_cert_hash(tls_ctx)) != 0)
1.133 beck 689: errx(1, "peer certificate is not %s", tls_expecthash);
690: }
1.141 deraadt 691:
1.133 beck 692: struct tls *
693: tls_setup_server(struct tls *tls_ctx, int connfd, char *host)
694: {
695: struct tls *tls_cctx;
1.136 deraadt 696:
1.133 beck 697: if (tls_accept_socket(tls_ctx, &tls_cctx,
698: connfd) == -1) {
699: warnx("tls accept failed (%s)",
700: tls_error(tls_ctx));
701: tls_cctx = NULL;
702: } else {
703: int i;
1.136 deraadt 704:
1.133 beck 705: do {
706: if ((i = tls_handshake(tls_cctx)) == -1)
707: warnx("tls handshake failed (%s)",
708: tls_error(tls_cctx));
709: } while(i == TLS_WANT_POLLIN || i == TLS_WANT_POLLOUT);
710: }
711: if (tls_cctx) {
712: int gotcert = tls_peer_cert_provided(tls_cctx);
1.136 deraadt 713:
1.133 beck 714: if (vflag && gotcert)
715: report_tls(tls_cctx, host, tls_expectname);
716: if ((TLSopt & TLS_CCERT) && !gotcert)
717: warnx("No client certificate provided");
1.137 beck 718: else if (gotcert && tls_peer_cert_hash(tls_ctx) && tls_expecthash &&
719: strcmp(tls_expecthash, tls_peer_cert_hash(tls_ctx)) != 0)
1.133 beck 720: warnx("peer certificate is not %s", tls_expecthash);
721: else if (gotcert && tls_expectname &&
1.134 deraadt 722: (!tls_peer_cert_contains_name(tls_cctx, tls_expectname)))
1.133 beck 723: warnx("name (%s) not found in client cert",
724: tls_expectname);
725: else {
726: return tls_cctx;
727: }
728: }
729: return NULL;
730: }
1.141 deraadt 731:
1.42 ericj 732: /*
1.99 jeremy 733: * unix_connect()
734: * Returns a socket connected to a local unix socket. Returns -1 on failure.
1.42 ericj 735: */
736: int
1.99 jeremy 737: unix_connect(char *path)
1.42 ericj 738: {
1.144 bcook 739: struct sockaddr_un s_un;
1.42 ericj 740: int s;
741:
1.99 jeremy 742: if (uflag) {
1.136 deraadt 743: if ((s = unix_bind(unix_dg_tmp_socket, SOCK_CLOEXEC)) < 0)
1.99 jeremy 744: return (-1);
745: } else {
1.136 deraadt 746: if ((s = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0)) < 0)
1.99 jeremy 747: return (-1);
748: }
1.42 ericj 749:
1.144 bcook 750: memset(&s_un, 0, sizeof(struct sockaddr_un));
751: s_un.sun_family = AF_UNIX;
1.60 avsm 752:
1.144 bcook 753: if (strlcpy(s_un.sun_path, path, sizeof(s_un.sun_path)) >=
754: sizeof(s_un.sun_path)) {
1.60 avsm 755: close(s);
756: errno = ENAMETOOLONG;
757: return (-1);
758: }
1.144 bcook 759: if (connect(s, (struct sockaddr *)&s_un, sizeof(s_un)) < 0) {
1.42 ericj 760: close(s);
761: return (-1);
762: }
1.99 jeremy 763: return (s);
764:
765: }
766:
767: /*
768: * unix_listen()
769: * Create a unix domain socket, and listen on it.
770: */
771: int
772: unix_listen(char *path)
773: {
774: int s;
1.136 deraadt 775: if ((s = unix_bind(path, 0)) < 0)
1.99 jeremy 776: return (-1);
1.42 ericj 777:
778: if (listen(s, 5) < 0) {
779: close(s);
780: return (-1);
781: }
782: return (s);
783: }
784:
785: /*
1.21 ericj 786: * remote_connect()
1.67 jmc 787: * Returns a socket connected to a remote host. Properly binds to a local
788: * port or source address if needed. Returns -1 on failure.
1.11 ericj 789: */
1.21 ericj 790: int
1.77 otto 791: remote_connect(const char *host, const char *port, struct addrinfo hints)
1.21 ericj 792: {
793: struct addrinfo *res, *res0;
1.91 markus 794: int s, error, on = 1;
1.21 ericj 795:
796: if ((error = getaddrinfo(host, port, &hints, &res)))
1.56 stevesk 797: errx(1, "getaddrinfo: %s", gai_strerror(error));
1.21 ericj 798:
799: res0 = res;
800: do {
1.132 bluhm 801: if ((s = socket(res0->ai_family, res0->ai_socktype |
802: SOCK_NONBLOCK, res0->ai_protocol)) < 0)
1.21 ericj 803: continue;
804:
1.67 jmc 805: /* Bind to a local port or source address if specified. */
1.21 ericj 806: if (sflag || pflag) {
807: struct addrinfo ahints, *ares;
1.6 deraadt 808:
1.91 markus 809: /* try SO_BINDANY, but don't insist */
810: setsockopt(s, SOL_SOCKET, SO_BINDANY, &on, sizeof(on));
1.21 ericj 811: memset(&ahints, 0, sizeof(struct addrinfo));
812: ahints.ai_family = res0->ai_family;
813: ahints.ai_socktype = uflag ? SOCK_DGRAM : SOCK_STREAM;
814: ahints.ai_protocol = uflag ? IPPROTO_UDP : IPPROTO_TCP;
1.25 ericj 815: ahints.ai_flags = AI_PASSIVE;
1.38 jakob 816: if ((error = getaddrinfo(sflag, pflag, &ahints, &ares)))
1.56 stevesk 817: errx(1, "getaddrinfo: %s", gai_strerror(error));
1.21 ericj 818:
819: if (bind(s, (struct sockaddr *)ares->ai_addr,
1.62 millert 820: ares->ai_addrlen) < 0)
1.119 guenther 821: err(1, "bind failed");
1.21 ericj 822: freeaddrinfo(ares);
1.6 deraadt 823: }
1.81 marius 824:
1.127 jca 825: set_common_sockopts(s, res0->ai_family);
1.6 deraadt 826:
1.103 fgsch 827: if (timeout_connect(s, res0->ai_addr, res0->ai_addrlen) == 0)
1.6 deraadt 828: break;
1.143 deraadt 829: if (vflag)
1.71 mcbride 830: warn("connect to %s port %s (%s) failed", host, port,
831: uflag ? "udp" : "tcp");
1.34 jakob 832:
1.21 ericj 833: close(s);
834: s = -1;
835: } while ((res0 = res0->ai_next) != NULL);
836:
837: freeaddrinfo(res);
1.1 deraadt 838:
1.21 ericj 839: return (s);
1.103 fgsch 840: }
841:
842: int
843: timeout_connect(int s, const struct sockaddr *name, socklen_t namelen)
844: {
845: struct pollfd pfd;
846: socklen_t optlen;
1.132 bluhm 847: int optval;
1.103 fgsch 848: int ret;
849:
850: if ((ret = connect(s, name, namelen)) != 0 && errno == EINPROGRESS) {
851: pfd.fd = s;
852: pfd.events = POLLOUT;
853: if ((ret = poll(&pfd, 1, timeout)) == 1) {
854: optlen = sizeof(optval);
855: if ((ret = getsockopt(s, SOL_SOCKET, SO_ERROR,
856: &optval, &optlen)) == 0) {
857: errno = optval;
858: ret = optval == 0 ? 0 : -1;
859: }
860: } else if (ret == 0) {
861: errno = ETIMEDOUT;
862: ret = -1;
863: } else
864: err(1, "poll failed");
865: }
866:
867: return (ret);
1.7 deraadt 868: }
1.1 deraadt 869:
1.11 ericj 870: /*
1.21 ericj 871: * local_listen()
1.67 jmc 872: * Returns a socket listening on a local port, binds to specified source
873: * address. Returns -1 on failure.
1.11 ericj 874: */
1.21 ericj 875: int
1.37 jakob 876: local_listen(char *host, char *port, struct addrinfo hints)
1.21 ericj 877: {
878: struct addrinfo *res, *res0;
879: int s, ret, x = 1;
880: int error;
1.6 deraadt 881:
1.67 jmc 882: /* Allow nodename to be null. */
1.21 ericj 883: hints.ai_flags |= AI_PASSIVE;
1.7 deraadt 884:
1.21 ericj 885: /*
886: * In the case of binding to a wildcard address
887: * default to binding to an ipv4 address.
888: */
889: if (host == NULL && hints.ai_family == AF_UNSPEC)
890: hints.ai_family = AF_INET;
1.1 deraadt 891:
1.21 ericj 892: if ((error = getaddrinfo(host, port, &hints, &res)))
1.70 deraadt 893: errx(1, "getaddrinfo: %s", gai_strerror(error));
1.14 ericj 894:
1.21 ericj 895: res0 = res;
896: do {
897: if ((s = socket(res0->ai_family, res0->ai_socktype,
1.82 marius 898: res0->ai_protocol)) < 0)
1.21 ericj 899: continue;
1.93 claudio 900:
1.21 ericj 901: ret = setsockopt(s, SOL_SOCKET, SO_REUSEPORT, &x, sizeof(x));
902: if (ret == -1)
1.30 smart 903: err(1, NULL);
1.81 marius 904:
1.127 jca 905: set_common_sockopts(s, res0->ai_family);
1.1 deraadt 906:
1.21 ericj 907: if (bind(s, (struct sockaddr *)res0->ai_addr,
1.37 jakob 908: res0->ai_addrlen) == 0)
1.21 ericj 909: break;
1.1 deraadt 910:
1.21 ericj 911: close(s);
912: s = -1;
913: } while ((res0 = res0->ai_next) != NULL);
1.1 deraadt 914:
1.47 ericj 915: if (!uflag && s != -1) {
1.21 ericj 916: if (listen(s, 1) < 0)
1.57 stevesk 917: err(1, "listen");
1.12 ericj 918: }
1.1 deraadt 919:
1.21 ericj 920: freeaddrinfo(res);
1.1 deraadt 921:
1.21 ericj 922: return (s);
1.7 deraadt 923: }
924:
1.11 ericj 925: /*
1.21 ericj 926: * readwrite()
927: * Loop that polls on the network file descriptor and stdin.
1.11 ericj 928: */
1.21 ericj 929: void
1.133 beck 930: readwrite(int net_fd, struct tls *tls_ctx)
1.6 deraadt 931: {
1.125 tedu 932: struct pollfd pfd[4];
933: int stdin_fd = STDIN_FILENO;
934: int stdout_fd = STDOUT_FILENO;
935: unsigned char netinbuf[BUFSIZE];
936: size_t netinbufpos = 0;
937: unsigned char stdinbuf[BUFSIZE];
938: size_t stdinbufpos = 0;
1.130 chl 939: int n, num_fds;
1.125 tedu 940: ssize_t ret;
941:
942: /* don't read from stdin if requested */
943: if (dflag)
944: stdin_fd = -1;
945:
946: /* stdin */
947: pfd[POLL_STDIN].fd = stdin_fd;
948: pfd[POLL_STDIN].events = POLLIN;
949:
950: /* network out */
951: pfd[POLL_NETOUT].fd = net_fd;
952: pfd[POLL_NETOUT].events = 0;
953:
954: /* network in */
955: pfd[POLL_NETIN].fd = net_fd;
956: pfd[POLL_NETIN].events = POLLIN;
957:
958: /* stdout */
959: pfd[POLL_STDOUT].fd = stdout_fd;
960: pfd[POLL_STDOUT].events = 0;
961:
962: while (1) {
963: /* both inputs are gone, buffers are empty, we are done */
1.134 deraadt 964: if (pfd[POLL_STDIN].fd == -1 && pfd[POLL_NETIN].fd == -1 &&
965: stdinbufpos == 0 && netinbufpos == 0) {
1.125 tedu 966: close(net_fd);
967: return;
968: }
969: /* both outputs are gone, we can't continue */
970: if (pfd[POLL_NETOUT].fd == -1 && pfd[POLL_STDOUT].fd == -1) {
971: close(net_fd);
972: return;
973: }
974: /* listen and net in gone, queues empty, done */
1.134 deraadt 975: if (lflag && pfd[POLL_NETIN].fd == -1 &&
976: stdinbufpos == 0 && netinbufpos == 0) {
1.125 tedu 977: close(net_fd);
978: return;
979: }
1.21 ericj 980:
1.125 tedu 981: /* help says -i is for "wait between lines sent". We read and
982: * write arbitrary amounts of data, and we don't want to start
983: * scanning for newlines, so this is as good as it gets */
1.21 ericj 984: if (iflag)
985: sleep(iflag);
986:
1.125 tedu 987: /* poll */
988: num_fds = poll(pfd, 4, timeout);
989:
990: /* treat poll errors */
991: if (num_fds == -1) {
992: close(net_fd);
993: err(1, "polling error");
1.21 ericj 994: }
1.49 hugh 995:
1.125 tedu 996: /* timeout happened */
997: if (num_fds == 0)
1.49 hugh 998: return;
1.21 ericj 999:
1.125 tedu 1000: /* treat socket error conditions */
1001: for (n = 0; n < 4; n++) {
1002: if (pfd[n].revents & (POLLERR|POLLNVAL)) {
1003: pfd[n].fd = -1;
1.6 deraadt 1004: }
1.21 ericj 1005: }
1.125 tedu 1006: /* reading is possible after HUP */
1007: if (pfd[POLL_STDIN].events & POLLIN &&
1008: pfd[POLL_STDIN].revents & POLLHUP &&
1.134 deraadt 1009: !(pfd[POLL_STDIN].revents & POLLIN))
1010: pfd[POLL_STDIN].fd = -1;
1.125 tedu 1011:
1012: if (pfd[POLL_NETIN].events & POLLIN &&
1013: pfd[POLL_NETIN].revents & POLLHUP &&
1.134 deraadt 1014: !(pfd[POLL_NETIN].revents & POLLIN))
1015: pfd[POLL_NETIN].fd = -1;
1.125 tedu 1016:
1017: if (pfd[POLL_NETOUT].revents & POLLHUP) {
1018: if (Nflag)
1019: shutdown(pfd[POLL_NETOUT].fd, SHUT_WR);
1020: pfd[POLL_NETOUT].fd = -1;
1021: }
1022: /* if HUP, stop watching stdout */
1023: if (pfd[POLL_STDOUT].revents & POLLHUP)
1024: pfd[POLL_STDOUT].fd = -1;
1025: /* if no net out, stop watching stdin */
1026: if (pfd[POLL_NETOUT].fd == -1)
1027: pfd[POLL_STDIN].fd = -1;
1028: /* if no stdout, stop watching net in */
1029: if (pfd[POLL_STDOUT].fd == -1) {
1030: if (pfd[POLL_NETIN].fd != -1)
1031: shutdown(pfd[POLL_NETIN].fd, SHUT_RD);
1032: pfd[POLL_NETIN].fd = -1;
1033: }
1.21 ericj 1034:
1.125 tedu 1035: /* try to read from stdin */
1036: if (pfd[POLL_STDIN].revents & POLLIN && stdinbufpos < BUFSIZE) {
1037: ret = fillbuf(pfd[POLL_STDIN].fd, stdinbuf,
1.133 beck 1038: &stdinbufpos, NULL);
1039: if (ret == TLS_WANT_POLLIN)
1040: pfd[POLL_STDIN].events = POLLIN;
1041: else if (ret == TLS_WANT_POLLOUT)
1042: pfd[POLL_STDIN].events = POLLOUT;
1043: else if (ret == 0 || ret == -1)
1.125 tedu 1044: pfd[POLL_STDIN].fd = -1;
1045: /* read something - poll net out */
1046: if (stdinbufpos > 0)
1047: pfd[POLL_NETOUT].events = POLLOUT;
1048: /* filled buffer - remove self from polling */
1049: if (stdinbufpos == BUFSIZE)
1050: pfd[POLL_STDIN].events = 0;
1051: }
1052: /* try to write to network */
1053: if (pfd[POLL_NETOUT].revents & POLLOUT && stdinbufpos > 0) {
1054: ret = drainbuf(pfd[POLL_NETOUT].fd, stdinbuf,
1.133 beck 1055: &stdinbufpos, tls_ctx);
1056: if (ret == TLS_WANT_POLLIN)
1057: pfd[POLL_NETOUT].events = POLLIN;
1058: else if (ret == TLS_WANT_POLLOUT)
1059: pfd[POLL_NETOUT].events = POLLOUT;
1060: else if (ret == -1)
1.125 tedu 1061: pfd[POLL_NETOUT].fd = -1;
1062: /* buffer empty - remove self from polling */
1063: if (stdinbufpos == 0)
1064: pfd[POLL_NETOUT].events = 0;
1065: /* buffer no longer full - poll stdin again */
1066: if (stdinbufpos < BUFSIZE)
1067: pfd[POLL_STDIN].events = POLLIN;
1068: }
1069: /* try to read from network */
1070: if (pfd[POLL_NETIN].revents & POLLIN && netinbufpos < BUFSIZE) {
1071: ret = fillbuf(pfd[POLL_NETIN].fd, netinbuf,
1.133 beck 1072: &netinbufpos, tls_ctx);
1073: if (ret == TLS_WANT_POLLIN)
1074: pfd[POLL_NETIN].events = POLLIN;
1075: else if (ret == TLS_WANT_POLLOUT)
1076: pfd[POLL_NETIN].events = POLLOUT;
1077: else if (ret == -1)
1.125 tedu 1078: pfd[POLL_NETIN].fd = -1;
1079: /* eof on net in - remove from pfd */
1080: if (ret == 0) {
1081: shutdown(pfd[POLL_NETIN].fd, SHUT_RD);
1082: pfd[POLL_NETIN].fd = -1;
1.50 vincent 1083: }
1.125 tedu 1084: /* read something - poll stdout */
1085: if (netinbufpos > 0)
1086: pfd[POLL_STDOUT].events = POLLOUT;
1087: /* filled buffer - remove self from polling */
1088: if (netinbufpos == BUFSIZE)
1089: pfd[POLL_NETIN].events = 0;
1090: /* handle telnet */
1091: if (tflag)
1092: atelnet(pfd[POLL_NETIN].fd, netinbuf,
1093: netinbufpos);
1094: }
1095: /* try to write to stdout */
1096: if (pfd[POLL_STDOUT].revents & POLLOUT && netinbufpos > 0) {
1097: ret = drainbuf(pfd[POLL_STDOUT].fd, netinbuf,
1.133 beck 1098: &netinbufpos, NULL);
1099: if (ret == TLS_WANT_POLLIN)
1100: pfd[POLL_STDOUT].events = POLLIN;
1101: else if (ret == TLS_WANT_POLLOUT)
1102: pfd[POLL_STDOUT].events = POLLOUT;
1103: else if (ret == -1)
1.125 tedu 1104: pfd[POLL_STDOUT].fd = -1;
1105: /* buffer empty - remove self from polling */
1106: if (netinbufpos == 0)
1107: pfd[POLL_STDOUT].events = 0;
1108: /* buffer no longer full - poll net in again */
1109: if (netinbufpos < BUFSIZE)
1110: pfd[POLL_NETIN].events = POLLIN;
1111: }
1112:
1113: /* stdin gone and queue empty? */
1114: if (pfd[POLL_STDIN].fd == -1 && stdinbufpos == 0) {
1115: if (pfd[POLL_NETOUT].fd != -1 && Nflag)
1116: shutdown(pfd[POLL_NETOUT].fd, SHUT_WR);
1117: pfd[POLL_NETOUT].fd = -1;
1118: }
1119: /* net in gone and queue empty? */
1120: if (pfd[POLL_NETIN].fd == -1 && netinbufpos == 0) {
1121: pfd[POLL_STDOUT].fd = -1;
1.21 ericj 1122: }
1.11 ericj 1123: }
1.125 tedu 1124: }
1125:
1126: ssize_t
1.133 beck 1127: drainbuf(int fd, unsigned char *buf, size_t *bufpos, struct tls *tls)
1.125 tedu 1128: {
1129: ssize_t n;
1130: ssize_t adjust;
1131:
1.133 beck 1132: if (tls)
1133: n = tls_write(tls, buf, *bufpos);
1134: else {
1135: n = write(fd, buf, *bufpos);
1136: /* don't treat EAGAIN, EINTR as error */
1137: if (n == -1 && (errno == EAGAIN || errno == EINTR))
1138: n = TLS_WANT_POLLOUT;
1139: }
1.125 tedu 1140: if (n <= 0)
1141: return n;
1142: /* adjust buffer */
1143: adjust = *bufpos - n;
1144: if (adjust > 0)
1145: memmove(buf, buf + n, adjust);
1146: *bufpos -= n;
1147: return n;
1148: }
1149:
1150: ssize_t
1.133 beck 1151: fillbuf(int fd, unsigned char *buf, size_t *bufpos, struct tls *tls)
1.125 tedu 1152: {
1153: size_t num = BUFSIZE - *bufpos;
1154: ssize_t n;
1155:
1.133 beck 1156: if (tls)
1157: n = tls_read(tls, buf + *bufpos, num);
1158: else {
1159: n = read(fd, buf + *bufpos, num);
1160: /* don't treat EAGAIN, EINTR as error */
1161: if (n == -1 && (errno == EAGAIN || errno == EINTR))
1162: n = TLS_WANT_POLLIN;
1163: }
1.125 tedu 1164: if (n <= 0)
1165: return n;
1166: *bufpos += n;
1167: return n;
1.113 djm 1168: }
1169:
1170: /*
1171: * fdpass()
1172: * Pass the connected file descriptor to stdout and exit.
1173: */
1174: void
1175: fdpass(int nfd)
1176: {
1177: struct msghdr mh;
1178: union {
1179: struct cmsghdr hdr;
1180: char buf[CMSG_SPACE(sizeof(int))];
1181: } cmsgbuf;
1182: struct cmsghdr *cmsg;
1183: struct iovec iov;
1184: char c = '\0';
1185: ssize_t r;
1186: struct pollfd pfd;
1187:
1188: /* Avoid obvious stupidity */
1189: if (isatty(STDOUT_FILENO))
1190: errx(1, "Cannot pass file descriptor to tty");
1191:
1192: bzero(&mh, sizeof(mh));
1193: bzero(&cmsgbuf, sizeof(cmsgbuf));
1194: bzero(&iov, sizeof(iov));
1195:
1196: mh.msg_control = (caddr_t)&cmsgbuf.buf;
1197: mh.msg_controllen = sizeof(cmsgbuf.buf);
1198: cmsg = CMSG_FIRSTHDR(&mh);
1199: cmsg->cmsg_len = CMSG_LEN(sizeof(int));
1200: cmsg->cmsg_level = SOL_SOCKET;
1201: cmsg->cmsg_type = SCM_RIGHTS;
1202: *(int *)CMSG_DATA(cmsg) = nfd;
1203:
1204: iov.iov_base = &c;
1205: iov.iov_len = 1;
1206: mh.msg_iov = &iov;
1207: mh.msg_iovlen = 1;
1208:
1209: bzero(&pfd, sizeof(pfd));
1210: pfd.fd = STDOUT_FILENO;
1.128 tobias 1211: pfd.events = POLLOUT;
1.113 djm 1212: for (;;) {
1213: r = sendmsg(STDOUT_FILENO, &mh, 0);
1214: if (r == -1) {
1215: if (errno == EAGAIN || errno == EINTR) {
1216: if (poll(&pfd, 1, -1) == -1)
1217: err(1, "poll");
1218: continue;
1219: }
1220: err(1, "sendmsg");
1.128 tobias 1221: } else if (r != 1)
1.113 djm 1222: errx(1, "sendmsg: unexpected return value %zd", r);
1223: else
1224: break;
1225: }
1226: exit(0);
1.7 deraadt 1227: }
1.50 vincent 1228:
1.67 jmc 1229: /* Deal with RFC 854 WILL/WONT DO/DONT negotiation. */
1.21 ericj 1230: void
1.37 jakob 1231: atelnet(int nfd, unsigned char *buf, unsigned int size)
1.6 deraadt 1232: {
1.24 ericj 1233: unsigned char *p, *end;
1234: unsigned char obuf[4];
1235:
1.95 nicm 1236: if (size < 3)
1237: return;
1238: end = buf + size - 2;
1.24 ericj 1239:
1240: for (p = buf; p < end; p++) {
1.21 ericj 1241: if (*p != IAC)
1.95 nicm 1242: continue;
1.24 ericj 1243:
1.25 ericj 1244: obuf[0] = IAC;
1.24 ericj 1245: p++;
1.50 vincent 1246: if ((*p == WILL) || (*p == WONT))
1.24 ericj 1247: obuf[1] = DONT;
1.95 nicm 1248: else if ((*p == DO) || (*p == DONT))
1.24 ericj 1249: obuf[1] = WONT;
1.95 nicm 1250: else
1251: continue;
1252:
1253: p++;
1254: obuf[2] = *p;
1255: if (atomicio(vwrite, nfd, obuf, 3) != 3)
1256: warn("Write Error!");
1.11 ericj 1257: }
1.7 deraadt 1258: }
1259:
1.11 ericj 1260: /*
1.21 ericj 1261: * build_ports()
1.105 lum 1262: * Build an array of ports in portlist[], listing each port
1.67 jmc 1263: * that we should try to connect to.
1.11 ericj 1264: */
1.21 ericj 1265: void
1.37 jakob 1266: build_ports(char *p)
1.6 deraadt 1267: {
1.88 ray 1268: const char *errstr;
1269: char *n;
1.21 ericj 1270: int hi, lo, cp;
1271: int x = 0;
1272:
1273: if ((n = strchr(p, '-')) != NULL) {
1274: *n = '\0';
1275: n++;
1276:
1.67 jmc 1277: /* Make sure the ports are in order: lowest->highest. */
1.88 ray 1278: hi = strtonum(n, 1, PORT_MAX, &errstr);
1279: if (errstr)
1280: errx(1, "port number %s: %s", errstr, n);
1281: lo = strtonum(p, 1, PORT_MAX, &errstr);
1282: if (errstr)
1283: errx(1, "port number %s: %s", errstr, p);
1.21 ericj 1284:
1285: if (lo > hi) {
1286: cp = hi;
1287: hi = lo;
1288: lo = cp;
1289: }
1290:
1.145 ! tb 1291: /*
! 1292: * Initialize portlist with a random permutation. Based on
! 1293: * Knuth, as in ip_randomid() in sys/netinet/ip_id.c.
! 1294: */
1.21 ericj 1295: if (rflag) {
1.145 ! tb 1296: for (x = 0; x <= hi - lo; x++) {
! 1297: cp = arc4random_uniform(x + 1);
! 1298: portlist[x] = portlist[cp];
! 1299: if (asprintf(&portlist[cp], "%d", x + lo) < 0)
! 1300: err(1, "asprintf");
! 1301: }
! 1302: } else { /* Load ports sequentially. */
! 1303: for (cp = lo; cp <= hi; cp++) {
! 1304: if (asprintf(&portlist[x], "%d", cp) < 0)
! 1305: err(1, "asprintf");
! 1306: x++;
1.6 deraadt 1307: }
1.11 ericj 1308: }
1.21 ericj 1309: } else {
1.88 ray 1310: hi = strtonum(p, 1, PORT_MAX, &errstr);
1311: if (errstr)
1312: errx(1, "port number %s: %s", errstr, p);
1.96 nicm 1313: portlist[0] = strdup(p);
1.55 fgsch 1314: if (portlist[0] == NULL)
1315: err(1, NULL);
1.11 ericj 1316: }
1.13 ericj 1317: }
1318:
1319: /*
1.21 ericj 1320: * udptest()
1321: * Do a few writes to see if the UDP port is there.
1.105 lum 1322: * Fails once PF state table is full.
1.13 ericj 1323: */
1.21 ericj 1324: int
1.37 jakob 1325: udptest(int s)
1.13 ericj 1326: {
1.74 deraadt 1327: int i, ret;
1.13 ericj 1328:
1.52 vincent 1329: for (i = 0; i <= 3; i++) {
1.74 deraadt 1330: if (write(s, "X", 1) == 1)
1.21 ericj 1331: ret = 1;
1.14 ericj 1332: else
1.21 ericj 1333: ret = -1;
1.14 ericj 1334: }
1.21 ericj 1335: return (ret);
1.81 marius 1336: }
1337:
1.84 dtucker 1338: void
1.127 jca 1339: set_common_sockopts(int s, int af)
1.81 marius 1340: {
1341: int x = 1;
1342:
1343: if (Sflag) {
1344: if (setsockopt(s, IPPROTO_TCP, TCP_MD5SIG,
1345: &x, sizeof(x)) == -1)
1346: err(1, NULL);
1347: }
1348: if (Dflag) {
1349: if (setsockopt(s, SOL_SOCKET, SO_DEBUG,
1350: &x, sizeof(x)) == -1)
1351: err(1, NULL);
1352: }
1.83 dtucker 1353: if (Tflag != -1) {
1.127 jca 1354: int proto, option;
1355:
1356: if (af == AF_INET6) {
1357: proto = IPPROTO_IPV6;
1358: option = IPV6_TCLASS;
1359: } else {
1360: proto = IPPROTO_IP;
1361: option = IP_TOS;
1362: }
1363:
1364: if (setsockopt(s, proto, option, &Tflag, sizeof(Tflag)) == -1)
1.83 dtucker 1365: err(1, "set IP ToS");
1366: }
1.90 djm 1367: if (Iflag) {
1368: if (setsockopt(s, SOL_SOCKET, SO_RCVBUF,
1369: &Iflag, sizeof(Iflag)) == -1)
1370: err(1, "set TCP receive buffer size");
1371: }
1372: if (Oflag) {
1373: if (setsockopt(s, SOL_SOCKET, SO_SNDBUF,
1374: &Oflag, sizeof(Oflag)) == -1)
1375: err(1, "set TCP send buffer size");
1376: }
1.83 dtucker 1377: }
1378:
1379: int
1.102 haesbaer 1380: map_tos(char *s, int *val)
1.83 dtucker 1381: {
1.102 haesbaer 1382: /* DiffServ Codepoints and other TOS mappings */
1383: const struct toskeywords {
1384: const char *keyword;
1385: int val;
1386: } *t, toskeywords[] = {
1387: { "af11", IPTOS_DSCP_AF11 },
1388: { "af12", IPTOS_DSCP_AF12 },
1389: { "af13", IPTOS_DSCP_AF13 },
1390: { "af21", IPTOS_DSCP_AF21 },
1391: { "af22", IPTOS_DSCP_AF22 },
1392: { "af23", IPTOS_DSCP_AF23 },
1393: { "af31", IPTOS_DSCP_AF31 },
1394: { "af32", IPTOS_DSCP_AF32 },
1395: { "af33", IPTOS_DSCP_AF33 },
1396: { "af41", IPTOS_DSCP_AF41 },
1397: { "af42", IPTOS_DSCP_AF42 },
1398: { "af43", IPTOS_DSCP_AF43 },
1399: { "critical", IPTOS_PREC_CRITIC_ECP },
1400: { "cs0", IPTOS_DSCP_CS0 },
1401: { "cs1", IPTOS_DSCP_CS1 },
1402: { "cs2", IPTOS_DSCP_CS2 },
1403: { "cs3", IPTOS_DSCP_CS3 },
1404: { "cs4", IPTOS_DSCP_CS4 },
1405: { "cs5", IPTOS_DSCP_CS5 },
1406: { "cs6", IPTOS_DSCP_CS6 },
1407: { "cs7", IPTOS_DSCP_CS7 },
1408: { "ef", IPTOS_DSCP_EF },
1409: { "inetcontrol", IPTOS_PREC_INTERNETCONTROL },
1410: { "lowdelay", IPTOS_LOWDELAY },
1411: { "netcontrol", IPTOS_PREC_NETCONTROL },
1412: { "reliability", IPTOS_RELIABILITY },
1413: { "throughput", IPTOS_THROUGHPUT },
1.134 deraadt 1414: { NULL, -1 },
1.102 haesbaer 1415: };
1416:
1417: for (t = toskeywords; t->keyword != NULL; t++) {
1418: if (strcmp(s, t->keyword) == 0) {
1419: *val = t->val;
1420: return (1);
1421: }
1422: }
1.83 dtucker 1423:
1.102 haesbaer 1424: return (0);
1.108 haesbaer 1425: }
1426:
1.133 beck 1427: int
1428: map_tls(char *s, int *val)
1429: {
1430: const struct tlskeywords {
1431: const char *keyword;
1432: int val;
1433: } *t, tlskeywords[] = {
1434: { "tlslegacy", TLS_LEGACY },
1435: { "noverify", TLS_NOVERIFY },
1436: { "noname", TLS_NONAME },
1437: { "clientcert", TLS_CCERT},
1.134 deraadt 1438: { NULL, -1 },
1.133 beck 1439: };
1440:
1441: for (t = tlskeywords; t->keyword != NULL; t++) {
1442: if (strcmp(s, t->keyword) == 0) {
1443: *val |= t->val;
1444: return (1);
1445: }
1446: }
1447: return (0);
1448: }
1449:
1450: void
1451: report_tls(struct tls * tls_ctx, char * host, char *tls_expectname)
1452: {
1453: char *subject = NULL, *issuer = NULL;
1.138 beck 1454: fprintf(stderr, "TLS handshake negotiated %s/%s with host %s\n",
1455: tls_conn_version(tls_ctx), tls_conn_cipher(tls_ctx), host);
1.133 beck 1456: fprintf(stderr, "Peer name %s\n",
1457: tls_expectname ? tls_expectname : host);
1.137 beck 1458: if (tls_peer_cert_subject(tls_ctx))
1459: fprintf(stderr, "Subject: %s\n",
1460: tls_peer_cert_subject(tls_ctx));
1461: if (tls_peer_cert_issuer(tls_ctx))
1462: fprintf(stderr, "Issuer: %s\n",
1463: tls_peer_cert_issuer(tls_ctx));
1464: if (tls_peer_cert_hash(tls_ctx))
1465: fprintf(stderr, "Cert Hash: %s\n",
1466: tls_peer_cert_hash(tls_ctx));
1.133 beck 1467: free(subject);
1468: free(issuer);
1469: }
1.108 haesbaer 1470: void
1471: report_connect(const struct sockaddr *sa, socklen_t salen)
1472: {
1473: char remote_host[NI_MAXHOST];
1474: char remote_port[NI_MAXSERV];
1475: int herr;
1476: int flags = NI_NUMERICSERV;
1.134 deraadt 1477:
1.108 haesbaer 1478: if (nflag)
1479: flags |= NI_NUMERICHOST;
1.134 deraadt 1480:
1.108 haesbaer 1481: if ((herr = getnameinfo(sa, salen,
1482: remote_host, sizeof(remote_host),
1483: remote_port, sizeof(remote_port),
1484: flags)) != 0) {
1485: if (herr == EAI_SYSTEM)
1486: err(1, "getnameinfo");
1487: else
1488: errx(1, "getnameinfo: %s", gai_strerror(herr));
1489: }
1.134 deraadt 1490:
1.108 haesbaer 1491: fprintf(stderr,
1492: "Connection from %s %s "
1493: "received!\n", remote_host, remote_port);
1.7 deraadt 1494: }
1.1 deraadt 1495:
1.11 ericj 1496: void
1.58 deraadt 1497: help(void)
1.1 deraadt 1498: {
1.21 ericj 1499: usage(0);
1500: fprintf(stderr, "\tCommand Summary:\n\
1501: \t-4 Use IPv4\n\
1502: \t-6 Use IPv6\n\
1.135 jmc 1503: \t-C certfile Public key file\n\
1504: \t-c Use TLS\n\
1.73 markus 1505: \t-D Enable the debug socket option\n\
1.69 tedu 1506: \t-d Detach from stdin\n\
1.135 jmc 1507: \t-e name\t Required name in peer certificate\n\
1.114 jmc 1508: \t-F Pass socket fd\n\
1.135 jmc 1509: \t-H hash\t Hash string of peer certificate\n\
1.21 ericj 1510: \t-h This help text\n\
1.90 djm 1511: \t-I length TCP receive buffer length\n\
1.135 jmc 1512: \t-i interval Delay interval for lines sent, ports scanned\n\
1513: \t-K keyfile Private key file\n\
1.21 ericj 1514: \t-k Keep inbound sockets open for multiple connects\n\
1515: \t-l Listen mode, for inbound connects\n\
1.111 sthen 1516: \t-N Shutdown the network socket after EOF on stdin\n\
1.22 jasoni 1517: \t-n Suppress name/port resolutions\n\
1.90 djm 1518: \t-O length TCP send buffer length\n\
1.86 djm 1519: \t-P proxyuser\tUsername for proxy authentication\n\
1.36 jakob 1520: \t-p port\t Specify local port for remote connects\n\
1.135 jmc 1521: \t-R CAfile CA bundle\n\
1.21 ericj 1522: \t-r Randomize remote ports\n\
1.67 jmc 1523: \t-S Enable the TCP MD5 signature option\n\
1.135 jmc 1524: \t-s source Local source address\n\
1525: \t-T keyword TOS value or TLS options\n\
1.21 ericj 1526: \t-t Answer TELNET negotiation\n\
1.67 jmc 1527: \t-U Use UNIX domain socket\n\
1.21 ericj 1528: \t-u UDP mode\n\
1.98 guenther 1529: \t-V rtable Specify alternate routing table\n\
1.21 ericj 1530: \t-v Verbose\n\
1.135 jmc 1531: \t-w timeout Timeout for connects and final net reads\n\
1.75 djm 1532: \t-X proto Proxy protocol: \"4\", \"5\" (SOCKS) or \"connect\"\n\
1533: \t-x addr[:port]\tSpecify proxy address and port\n\
1.21 ericj 1534: \t-z Zero-I/O mode [used for scanning]\n\
1535: Port numbers can be individual or ranges: lo-hi [inclusive]\n");
1536: exit(1);
1.11 ericj 1537: }
1538:
1539: void
1.37 jakob 1540: usage(int ret)
1.11 ericj 1541: {
1.92 sobrado 1542: fprintf(stderr,
1.135 jmc 1543: "usage: nc [-46cDdFhklNnrStUuvz] [-C certfile] [-e name] "
1544: "[-H hash] [-I length]\n"
1545: "\t [-i interval] [-K keyfile] [-O length] [-P proxy_username]\n"
1546: "\t [-p source_port] [-R CAfile] [-s source] "
1547: "[-T keyword] [-V rtable]\n"
1548: "\t [-w timeout] [-X proxy_protocol] [-x proxy_address[:port]]\n"
1.133 beck 1549: "\t [destination] [port]\n");
1.21 ericj 1550: if (ret)
1551: exit(1);
1.7 deraadt 1552: }
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