Annotation of src/usr.bin/nc/netcat.c, Revision 1.142
1.142 ! benno 1: /* $OpenBSD: netcat.c,v 1.141 2015/11/01 01:05:31 deraadt 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
61: #define PORT_MAX_LEN 6
1.99 jeremy 62: #define UNIX_DG_TMP_SOCKET_SIZE 19
1.31 ericj 63:
1.125 tedu 64: #define POLL_STDIN 0
65: #define POLL_NETOUT 1
66: #define POLL_NETIN 2
67: #define POLL_STDOUT 3
1.126 tedu 68: #define BUFSIZE 16384
1.133 beck 69: #define DEFAULT_CA_FILE "/etc/ssl/cert.pem"
70:
71: #define TLS_LEGACY (1 << 1)
72: #define TLS_NOVERIFY (1 << 2)
73: #define TLS_NONAME (1 << 3)
74: #define TLS_CCERT (1 << 4)
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 */
103: char *Rflag = DEFAULT_CA_FILE; /* Root CA file */
104: int tls_cachanged; /* Using non-default CA file */
105: int TLSopt; /* TLS options */
106: char *tls_expectname; /* required name in peer cert */
107: char *tls_expecthash; /* required hash of peer cert */
108:
1.49 hugh 109: int timeout = -1;
1.21 ericj 110: int family = AF_UNSPEC;
1.63 miod 111: char *portlist[PORT_MAX+1];
1.99 jeremy 112: char *unix_dg_tmp_socket;
1.21 ericj 113:
1.40 millert 114: void atelnet(int, unsigned char *, unsigned int);
115: void build_ports(char *);
116: void help(void);
117: int local_listen(char *, char *, struct addrinfo);
1.133 beck 118: void readwrite(int, struct tls *);
1.113 djm 119: void fdpass(int nfd) __attribute__((noreturn));
1.77 otto 120: int remote_connect(const char *, const char *, struct addrinfo);
1.103 fgsch 121: int timeout_connect(int, const struct sockaddr *, socklen_t);
1.86 djm 122: int socks_connect(const char *, const char *, struct addrinfo,
123: const char *, const char *, struct addrinfo, int, const char *);
1.40 millert 124: int udptest(int);
1.136 deraadt 125: int unix_bind(char *, int);
1.42 ericj 126: int unix_connect(char *);
127: int unix_listen(char *);
1.127 jca 128: void set_common_sockopts(int, int);
1.102 haesbaer 129: int map_tos(char *, int *);
1.133 beck 130: int map_tls(char *, int *);
1.108 haesbaer 131: void report_connect(const struct sockaddr *, socklen_t);
1.134 deraadt 132: void report_tls(struct tls *tls_ctx, char * host, char *tls_expectname);
1.40 millert 133: void usage(int);
1.133 beck 134: ssize_t drainbuf(int, unsigned char *, size_t *, struct tls *);
135: ssize_t fillbuf(int, unsigned char *, size_t *, struct tls *);
136: void tls_setup_client(struct tls *, int, char *);
1.134 deraadt 137: struct tls *tls_setup_server(struct tls *, int, char *);
1.1 deraadt 138:
1.21 ericj 139: int
1.37 jakob 140: main(int argc, char *argv[])
1.21 ericj 141: {
1.46 markus 142: int ch, s, ret, socksv;
1.88 ray 143: char *host, *uport;
1.21 ericj 144: struct addrinfo hints;
1.29 smart 145: struct servent *sv;
1.21 ericj 146: socklen_t len;
1.76 hshoexer 147: struct sockaddr_storage cliaddr;
1.34 jakob 148: char *proxy;
1.88 ray 149: const char *errstr, *proxyhost = "", *proxyport = NULL;
1.34 jakob 150: struct addrinfo proxyhints;
1.99 jeremy 151: char unix_dg_tmp_socket_buf[UNIX_DG_TMP_SOCKET_SIZE];
1.133 beck 152: struct tls_config *tls_cfg = NULL;
153: struct tls *tls_ctx = NULL;
1.11 ericj 154:
1.29 smart 155: ret = 1;
156: s = 0;
1.46 markus 157: socksv = 5;
1.29 smart 158: host = NULL;
159: uport = NULL;
160: sv = NULL;
1.129 tobias 161:
162: signal(SIGPIPE, SIG_IGN);
1.29 smart 163:
1.80 mcbride 164: while ((ch = getopt(argc, argv,
1.133 beck 165: "46C:cDde:FH:hI:i:K:klNnO:P:p:R:rSs:T:tUuV:vw:X:x:z")) != -1) {
1.21 ericj 166: switch (ch) {
167: case '4':
168: family = AF_INET;
169: break;
170: case '6':
171: family = AF_INET6;
172: break;
1.42 ericj 173: case 'U':
174: family = AF_UNIX;
175: break;
1.46 markus 176: case 'X':
1.75 djm 177: if (strcasecmp(optarg, "connect") == 0)
178: socksv = -1; /* HTTP proxy CONNECT */
179: else if (strcmp(optarg, "4") == 0)
180: socksv = 4; /* SOCKS v.4 */
181: else if (strcmp(optarg, "5") == 0)
182: socksv = 5; /* SOCKS v.5 */
183: else
184: errx(1, "unsupported proxy protocol");
1.46 markus 185: break;
1.133 beck 186: case 'C':
187: Cflag = optarg;
188: break;
189: case 'c':
190: usetls = 1;
191: break;
1.68 tedu 192: case 'd':
193: dflag = 1;
194: break;
1.133 beck 195: case 'e':
196: tls_expectname = optarg;
197: break;
1.113 djm 198: case 'F':
199: Fflag = 1;
200: break;
1.133 beck 201: case 'H':
202: tls_expecthash = optarg;
203: break;
1.21 ericj 204: case 'h':
205: help();
206: break;
207: case 'i':
1.88 ray 208: iflag = strtonum(optarg, 0, UINT_MAX, &errstr);
209: if (errstr)
210: errx(1, "interval %s: %s", errstr, optarg);
1.21 ericj 211: break;
1.133 beck 212: case 'K':
213: Kflag = optarg;
214: break;
1.21 ericj 215: case 'k':
216: kflag = 1;
217: break;
218: case 'l':
219: lflag = 1;
220: break;
1.111 sthen 221: case 'N':
222: Nflag = 1;
223: break;
1.21 ericj 224: case 'n':
225: nflag = 1;
226: break;
1.86 djm 227: case 'P':
228: Pflag = optarg;
229: break;
1.21 ericj 230: case 'p':
231: pflag = optarg;
232: break;
1.133 beck 233: case 'R':
234: tls_cachanged = 1;
235: Rflag = optarg;
236: break;
1.21 ericj 237: case 'r':
238: rflag = 1;
239: break;
240: case 's':
241: sflag = optarg;
242: break;
243: case 't':
244: tflag = 1;
245: break;
246: case 'u':
247: uflag = 1;
248: break;
1.93 claudio 249: case 'V':
1.117 sthen 250: rtableid = (int)strtonum(optarg, 0,
1.93 claudio 251: RT_TABLEID_MAX, &errstr);
252: if (errstr)
1.98 guenther 253: errx(1, "rtable %s: %s", errstr, optarg);
1.93 claudio 254: break;
1.21 ericj 255: case 'v':
256: vflag = 1;
257: break;
1.70 deraadt 258: case 'w':
1.88 ray 259: timeout = strtonum(optarg, 0, INT_MAX / 1000, &errstr);
260: if (errstr)
261: errx(1, "timeout %s: %s", errstr, optarg);
1.49 hugh 262: timeout *= 1000;
1.21 ericj 263: break;
1.34 jakob 264: case 'x':
265: xflag = 1;
1.64 deraadt 266: if ((proxy = strdup(optarg)) == NULL)
267: err(1, NULL);
1.34 jakob 268: break;
1.21 ericj 269: case 'z':
270: zflag = 1;
271: break;
1.73 markus 272: case 'D':
273: Dflag = 1;
274: break;
1.90 djm 275: case 'I':
276: Iflag = strtonum(optarg, 1, 65536 << 14, &errstr);
277: if (errstr != NULL)
278: errx(1, "TCP receive window %s: %s",
279: errstr, optarg);
280: break;
281: case 'O':
282: Oflag = strtonum(optarg, 1, 65536 << 14, &errstr);
283: if (errstr != NULL)
284: errx(1, "TCP send window %s: %s",
285: errstr, optarg);
286: break;
1.65 markus 287: case 'S':
288: Sflag = 1;
289: break;
1.83 dtucker 290: case 'T':
1.102 haesbaer 291: errstr = NULL;
292: errno = 0;
293: if (map_tos(optarg, &Tflag))
294: break;
1.133 beck 295: if (map_tls(optarg, &TLSopt))
296: break;
1.102 haesbaer 297: if (strlen(optarg) > 1 && optarg[0] == '0' &&
298: optarg[1] == 'x')
299: Tflag = (int)strtol(optarg, NULL, 16);
300: else
301: Tflag = (int)strtonum(optarg, 0, 255,
302: &errstr);
303: if (Tflag < 0 || Tflag > 255 || errstr || errno)
1.133 beck 304: errx(1, "illegal tos/tls value %s", optarg);
1.83 dtucker 305: break;
1.21 ericj 306: default:
307: usage(1);
308: }
309: }
310: argc -= optind;
311: argv += optind;
1.11 ericj 312:
1.140 beck 313: if (rtableid >= 0) {
1.142 ! benno 314: if (setrtable(rtableid) == -1)
! 315: err(1, "setrtable");
1.140 beck 316: }
1.142 ! benno 317: if (family == AF_UNIX) {
1.140 beck 318: if (pledge("stdio rpath wpath cpath tmppath unix", NULL) == -1)
319: err(1, "pledge");
320: }
321: else if (Fflag) {
322: if (pledge("stdio inet dns sendfd", NULL) == -1)
323: err(1, "pledge");
324: }
325: else if (usetls) {
326: if (pledge("stdio rpath inet dns", NULL) == -1)
327: err(1, "pledge");
328: }
329: else if (pledge("stdio inet dns", NULL) == -1)
330: err(1, "pledge");
331:
1.21 ericj 332: /* Cruft to make sure options are clean, and used properly. */
1.42 ericj 333: if (argv[0] && !argv[1] && family == AF_UNIX) {
334: host = argv[0];
335: uport = NULL;
336: } else if (argv[0] && !argv[1]) {
1.21 ericj 337: if (!lflag)
338: usage(1);
339: uport = argv[0];
340: host = NULL;
341: } else if (argv[0] && argv[1]) {
342: host = argv[0];
343: uport = argv[1];
344: } else
345: usage(1);
1.1 deraadt 346:
1.21 ericj 347: if (lflag && sflag)
348: errx(1, "cannot use -s and -l");
349: if (lflag && pflag)
350: errx(1, "cannot use -p and -l");
351: if (lflag && zflag)
1.32 ericj 352: errx(1, "cannot use -z and -l");
1.21 ericj 353: if (!lflag && kflag)
1.32 ericj 354: errx(1, "must use -l with -k");
1.133 beck 355: if (uflag && usetls)
356: errx(1, "cannot use -c and -u");
357: if ((family == AF_UNIX) && usetls)
358: errx(1, "cannot use -c and -U");
1.140 beck 359: if ((family == AF_UNIX) && Fflag)
360: errx(1, "cannot use -F and -U");
361: if (Fflag && usetls)
362: errx(1, "cannot use -c and -F");
1.133 beck 363: if (TLSopt && !usetls)
364: errx(1, "you must specify -c to use TLS options");
365: if (Cflag && !usetls)
366: errx(1, "you must specify -c to use -C");
367: if (Kflag && !usetls)
368: errx(1, "you must specify -c to use -K");
369: if (tls_cachanged && !usetls)
370: errx(1, "you must specify -c to use -R");
371: if (tls_expecthash && !usetls)
372: errx(1, "you must specify -c to use -H");
373: if (tls_expectname && !usetls)
374: errx(1, "you must specify -c to use -e");
1.21 ericj 375:
1.99 jeremy 376: /* Get name of temporary socket for unix datagram client */
377: if ((family == AF_UNIX) && uflag && !lflag) {
378: if (sflag) {
379: unix_dg_tmp_socket = sflag;
380: } else {
381: strlcpy(unix_dg_tmp_socket_buf, "/tmp/nc.XXXXXXXXXX",
1.136 deraadt 382: UNIX_DG_TMP_SOCKET_SIZE);
1.99 jeremy 383: if (mktemp(unix_dg_tmp_socket_buf) == NULL)
384: err(1, "mktemp");
385: unix_dg_tmp_socket = unix_dg_tmp_socket_buf;
386: }
387: }
388:
1.67 jmc 389: /* Initialize addrinfo structure. */
1.42 ericj 390: if (family != AF_UNIX) {
391: memset(&hints, 0, sizeof(struct addrinfo));
392: hints.ai_family = family;
393: hints.ai_socktype = uflag ? SOCK_DGRAM : SOCK_STREAM;
394: hints.ai_protocol = uflag ? IPPROTO_UDP : IPPROTO_TCP;
395: if (nflag)
396: hints.ai_flags |= AI_NUMERICHOST;
397: }
1.1 deraadt 398:
1.34 jakob 399: if (xflag) {
400: if (uflag)
401: errx(1, "no proxy support for UDP mode");
402:
403: if (lflag)
404: errx(1, "no proxy support for listen");
405:
1.42 ericj 406: if (family == AF_UNIX)
407: errx(1, "no proxy support for unix sockets");
408:
1.34 jakob 409: /* XXX IPv6 transport to proxy would probably work */
410: if (family == AF_INET6)
411: errx(1, "no proxy support for IPv6");
412:
413: if (sflag)
414: errx(1, "no proxy support for local source address");
415:
416: proxyhost = strsep(&proxy, ":");
417: proxyport = proxy;
418:
419: memset(&proxyhints, 0, sizeof(struct addrinfo));
420: proxyhints.ai_family = family;
421: proxyhints.ai_socktype = SOCK_STREAM;
422: proxyhints.ai_protocol = IPPROTO_TCP;
423: if (nflag)
424: proxyhints.ai_flags |= AI_NUMERICHOST;
425: }
426:
1.133 beck 427: if (usetls) {
428: if (tls_init() == -1)
429: errx(1, "unable to initialize TLS");
430: if ((tls_cfg = tls_config_new()) == NULL)
431: errx(1, "unable to allocate TLS config");
432: if (Cflag && (tls_config_set_cert_file(tls_cfg, Cflag) == -1))
433: errx(1, "unable to set TLS certificate file %s", Cflag);
434: if (Kflag && (tls_config_set_key_file(tls_cfg, Kflag) == -1))
435: errx(1, "unable to set TLS key file %s", Kflag);
436: if (Rflag && (tls_config_set_ca_file(tls_cfg, Rflag) == -1))
437: errx(1, "unable to set root CA file %s", Rflag);
438: if (TLSopt & TLS_LEGACY) {
439: tls_config_set_protocols(tls_cfg, TLS_PROTOCOLS_ALL);
440: tls_config_set_ciphers(tls_cfg, "legacy");
441: }
442: if (!lflag && (TLSopt & TLS_CCERT))
443: errx(1, "clientcert is only valid with -l");
444: if (TLSopt & TLS_NONAME)
445: tls_config_insecure_noverifyname(tls_cfg);
446: if (TLSopt & TLS_NOVERIFY) {
447: if (tls_expecthash != NULL)
448: errx(1, "-H and -T noverify may not be used"
449: "together");
450: tls_config_insecure_noverifycert(tls_cfg);
451: }
452: }
1.21 ericj 453: if (lflag) {
1.133 beck 454: struct tls *tls_cctx = NULL;
1.21 ericj 455: int connfd;
1.27 ericj 456: ret = 0;
1.1 deraadt 457:
1.99 jeremy 458: if (family == AF_UNIX) {
459: if (uflag)
1.136 deraadt 460: s = unix_bind(host, 0);
1.99 jeremy 461: else
462: s = unix_listen(host);
463: }
1.42 ericj 464:
1.133 beck 465: if (usetls) {
466: tls_config_verify_client_optional(tls_cfg);
467: if ((tls_ctx = tls_server()) == NULL)
468: errx(1, "tls server creation failed");
469: if (tls_configure(tls_ctx, tls_cfg) == -1)
470: errx(1, "tls configuration failed (%s)",
471: tls_error(tls_ctx));
472: }
1.67 jmc 473: /* Allow only one connection at a time, but stay alive. */
1.21 ericj 474: for (;;) {
1.42 ericj 475: if (family != AF_UNIX)
476: s = local_listen(host, uport, hints);
477: if (s < 0)
1.30 smart 478: err(1, NULL);
1.21 ericj 479: /*
1.109 haesbaer 480: * For UDP and -k, don't connect the socket, let it
481: * receive datagrams from multiple socket pairs.
1.21 ericj 482: */
1.109 haesbaer 483: if (uflag && kflag)
1.133 beck 484: readwrite(s, NULL);
1.109 haesbaer 485: /*
486: * For UDP and not -k, we will use recvfrom() initially
487: * to wait for a caller, then use the regular functions
488: * to talk to the caller.
489: */
490: else if (uflag && !kflag) {
1.80 mcbride 491: int rv, plen;
1.97 nicm 492: char buf[16384];
1.21 ericj 493: struct sockaddr_storage z;
494:
495: len = sizeof(z);
1.106 dlg 496: plen = 2048;
1.80 mcbride 497: rv = recvfrom(s, buf, plen, MSG_PEEK,
1.37 jakob 498: (struct sockaddr *)&z, &len);
1.23 ericj 499: if (rv < 0)
1.57 stevesk 500: err(1, "recvfrom");
1.21 ericj 501:
1.37 jakob 502: rv = connect(s, (struct sockaddr *)&z, len);
1.23 ericj 503: if (rv < 0)
1.57 stevesk 504: err(1, "connect");
1.1 deraadt 505:
1.108 haesbaer 506: if (vflag)
507: report_connect((struct sockaddr *)&z, len);
508:
1.133 beck 509: readwrite(s, NULL);
1.21 ericj 510: } else {
1.78 otto 511: len = sizeof(cliaddr);
1.132 bluhm 512: connfd = accept4(s, (struct sockaddr *)&cliaddr,
513: &len, SOCK_NONBLOCK);
1.110 deraadt 514: if (connfd == -1) {
515: /* For now, all errnos are fatal */
1.125 tedu 516: err(1, "accept");
1.110 deraadt 517: }
1.108 haesbaer 518: if (vflag)
519: report_connect((struct sockaddr *)&cliaddr, len);
1.133 beck 520: if ((usetls) &&
1.134 deraadt 521: (tls_cctx = tls_setup_server(tls_ctx, connfd, host)))
1.133 beck 522: readwrite(connfd, tls_cctx);
523: if (!usetls)
524: readwrite(connfd, NULL);
525: if (tls_cctx) {
526: int i;
1.136 deraadt 527:
1.133 beck 528: do {
529: i = tls_close(tls_cctx);
530: } while (i == TLS_WANT_POLLIN ||
531: i == TLS_WANT_POLLOUT);
532: tls_free(tls_cctx);
533: tls_cctx = NULL;
534: }
1.99 jeremy 535: close(connfd);
1.21 ericj 536: }
1.42 ericj 537: if (family != AF_UNIX)
538: close(s);
1.99 jeremy 539: else if (uflag) {
540: if (connect(s, NULL, 0) < 0)
541: err(1, "connect");
542: }
1.27 ericj 543:
1.21 ericj 544: if (!kflag)
545: break;
1.11 ericj 546: }
1.42 ericj 547: } else if (family == AF_UNIX) {
548: ret = 0;
549:
550: if ((s = unix_connect(host)) > 0 && !zflag) {
1.133 beck 551: readwrite(s, NULL);
1.42 ericj 552: close(s);
553: } else
554: ret = 1;
555:
1.99 jeremy 556: if (uflag)
557: unlink(unix_dg_tmp_socket);
1.42 ericj 558: exit(ret);
559:
1.21 ericj 560: } else {
561: int i = 0;
1.6 deraadt 562:
1.67 jmc 563: /* Construct the portlist[] array. */
1.21 ericj 564: build_ports(uport);
1.1 deraadt 565:
1.67 jmc 566: /* Cycle through portlist, connecting to each port. */
1.21 ericj 567: for (i = 0; portlist[i] != NULL; i++) {
568: if (s)
569: close(s);
1.34 jakob 570:
1.133 beck 571: if (usetls) {
572: if ((tls_ctx = tls_client()) == NULL)
573: errx(1, "tls client creation failed");
574: if (tls_configure(tls_ctx, tls_cfg) == -1)
575: errx(1, "tls configuration failed (%s)",
576: tls_error(tls_ctx));
577: }
1.34 jakob 578: if (xflag)
579: s = socks_connect(host, portlist[i], hints,
1.86 djm 580: proxyhost, proxyport, proxyhints, socksv,
581: Pflag);
1.34 jakob 582: else
583: s = remote_connect(host, portlist[i], hints);
584:
585: if (s < 0)
1.21 ericj 586: continue;
1.1 deraadt 587:
1.21 ericj 588: ret = 0;
589: if (vflag || zflag) {
1.67 jmc 590: /* For UDP, make sure we are connected. */
1.21 ericj 591: if (uflag) {
1.50 vincent 592: if (udptest(s) == -1) {
1.21 ericj 593: ret = 1;
594: continue;
595: }
596: }
1.1 deraadt 597:
1.67 jmc 598: /* Don't look up port if -n. */
1.21 ericj 599: if (nflag)
600: sv = NULL;
601: else {
602: sv = getservbyport(
1.37 jakob 603: ntohs(atoi(portlist[i])),
604: uflag ? "udp" : "tcp");
1.21 ericj 605: }
1.50 vincent 606:
1.94 mpf 607: fprintf(stderr,
608: "Connection to %s %s port [%s/%s] "
609: "succeeded!\n", host, portlist[i],
610: uflag ? "udp" : "tcp",
1.37 jakob 611: sv ? sv->s_name : "*");
1.21 ericj 612: }
1.113 djm 613: if (Fflag)
614: fdpass(s);
1.133 beck 615: else {
616: if (usetls)
617: tls_setup_client(tls_ctx, s, host);
618: if (!zflag)
619: readwrite(s, tls_ctx);
620: if (tls_ctx) {
621: int j;
1.136 deraadt 622:
1.133 beck 623: do {
624: j = tls_close(tls_ctx);
625: } while (j == TLS_WANT_POLLIN ||
626: j == TLS_WANT_POLLOUT);
627: tls_free(tls_ctx);
628: tls_ctx = NULL;
629: }
630: }
1.7 deraadt 631: }
1.11 ericj 632: }
1.1 deraadt 633:
1.21 ericj 634: if (s)
635: close(s);
636:
1.133 beck 637: tls_config_free(tls_cfg);
638:
1.21 ericj 639: exit(ret);
1.7 deraadt 640: }
1.1 deraadt 641:
1.11 ericj 642: /*
1.99 jeremy 643: * unix_bind()
644: * Returns a unix socket bound to the given path
1.42 ericj 645: */
646: int
1.136 deraadt 647: unix_bind(char *path, int flags)
1.42 ericj 648: {
649: struct sockaddr_un sun;
650: int s;
651:
1.99 jeremy 652: /* Create unix domain socket. */
1.136 deraadt 653: if ((s = socket(AF_UNIX, flags | (uflag ? SOCK_DGRAM : SOCK_STREAM),
654: 0)) < 0)
1.50 vincent 655: return (-1);
1.42 ericj 656:
657: memset(&sun, 0, sizeof(struct sockaddr_un));
658: sun.sun_family = AF_UNIX;
1.60 avsm 659:
660: if (strlcpy(sun.sun_path, path, sizeof(sun.sun_path)) >=
661: sizeof(sun.sun_path)) {
662: close(s);
663: errno = ENAMETOOLONG;
664: return (-1);
665: }
1.99 jeremy 666:
1.139 guenther 667: if (bind(s, (struct sockaddr *)&sun, sizeof(sun)) < 0) {
1.50 vincent 668: close(s);
669: return (-1);
1.42 ericj 670: }
671: return (s);
672: }
673:
1.133 beck 674: void
675: tls_setup_client(struct tls *tls_ctx, int s, char *host)
676: {
677: int i;
1.136 deraadt 678:
1.133 beck 679: if (tls_connect_socket(tls_ctx, s,
680: tls_expectname ? tls_expectname : host) == -1) {
681: errx(1, "tls connection failed (%s)",
682: tls_error(tls_ctx));
683: }
684: do {
685: if ((i = tls_handshake(tls_ctx)) == -1)
686: errx(1, "tls handshake failed (%s)",
687: tls_error(tls_ctx));
688: } while (i == TLS_WANT_POLLIN || i == TLS_WANT_POLLOUT);
689: if (vflag)
690: report_tls(tls_ctx, host, tls_expectname);
1.137 beck 691: if (tls_expecthash && tls_peer_cert_hash(tls_ctx) &&
692: strcmp(tls_expecthash, tls_peer_cert_hash(tls_ctx)) != 0)
1.133 beck 693: errx(1, "peer certificate is not %s", tls_expecthash);
694: }
1.141 deraadt 695:
1.133 beck 696: struct tls *
697: tls_setup_server(struct tls *tls_ctx, int connfd, char *host)
698: {
699: struct tls *tls_cctx;
1.136 deraadt 700:
1.133 beck 701: if (tls_accept_socket(tls_ctx, &tls_cctx,
702: connfd) == -1) {
703: warnx("tls accept failed (%s)",
704: tls_error(tls_ctx));
705: tls_cctx = NULL;
706: } else {
707: int i;
1.136 deraadt 708:
1.133 beck 709: do {
710: if ((i = tls_handshake(tls_cctx)) == -1)
711: warnx("tls handshake failed (%s)",
712: tls_error(tls_cctx));
713: } while(i == TLS_WANT_POLLIN || i == TLS_WANT_POLLOUT);
714: }
715: if (tls_cctx) {
716: int gotcert = tls_peer_cert_provided(tls_cctx);
1.136 deraadt 717:
1.133 beck 718: if (vflag && gotcert)
719: report_tls(tls_cctx, host, tls_expectname);
720: if ((TLSopt & TLS_CCERT) && !gotcert)
721: warnx("No client certificate provided");
1.137 beck 722: else if (gotcert && tls_peer_cert_hash(tls_ctx) && tls_expecthash &&
723: strcmp(tls_expecthash, tls_peer_cert_hash(tls_ctx)) != 0)
1.133 beck 724: warnx("peer certificate is not %s", tls_expecthash);
725: else if (gotcert && tls_expectname &&
1.134 deraadt 726: (!tls_peer_cert_contains_name(tls_cctx, tls_expectname)))
1.133 beck 727: warnx("name (%s) not found in client cert",
728: tls_expectname);
729: else {
730: return tls_cctx;
731: }
732: }
733: return NULL;
734: }
1.141 deraadt 735:
1.42 ericj 736: /*
1.99 jeremy 737: * unix_connect()
738: * Returns a socket connected to a local unix socket. Returns -1 on failure.
1.42 ericj 739: */
740: int
1.99 jeremy 741: unix_connect(char *path)
1.42 ericj 742: {
743: struct sockaddr_un sun;
744: int s;
745:
1.99 jeremy 746: if (uflag) {
1.136 deraadt 747: if ((s = unix_bind(unix_dg_tmp_socket, SOCK_CLOEXEC)) < 0)
1.99 jeremy 748: return (-1);
749: } else {
1.136 deraadt 750: if ((s = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0)) < 0)
1.99 jeremy 751: return (-1);
752: }
1.42 ericj 753:
1.60 avsm 754: memset(&sun, 0, sizeof(struct sockaddr_un));
1.42 ericj 755: sun.sun_family = AF_UNIX;
1.60 avsm 756:
757: if (strlcpy(sun.sun_path, path, sizeof(sun.sun_path)) >=
758: sizeof(sun.sun_path)) {
759: close(s);
760: errno = ENAMETOOLONG;
761: return (-1);
762: }
1.139 guenther 763: if (connect(s, (struct sockaddr *)&sun, sizeof(sun)) < 0) {
1.42 ericj 764: close(s);
765: return (-1);
766: }
1.99 jeremy 767: return (s);
768:
769: }
770:
771: /*
772: * unix_listen()
773: * Create a unix domain socket, and listen on it.
774: */
775: int
776: unix_listen(char *path)
777: {
778: int s;
1.136 deraadt 779: if ((s = unix_bind(path, 0)) < 0)
1.99 jeremy 780: return (-1);
1.42 ericj 781:
782: if (listen(s, 5) < 0) {
783: close(s);
784: return (-1);
785: }
786: return (s);
787: }
788:
789: /*
1.21 ericj 790: * remote_connect()
1.67 jmc 791: * Returns a socket connected to a remote host. Properly binds to a local
792: * port or source address if needed. Returns -1 on failure.
1.11 ericj 793: */
1.21 ericj 794: int
1.77 otto 795: remote_connect(const char *host, const char *port, struct addrinfo hints)
1.21 ericj 796: {
797: struct addrinfo *res, *res0;
1.91 markus 798: int s, error, on = 1;
1.21 ericj 799:
800: if ((error = getaddrinfo(host, port, &hints, &res)))
1.56 stevesk 801: errx(1, "getaddrinfo: %s", gai_strerror(error));
1.21 ericj 802:
803: res0 = res;
804: do {
1.132 bluhm 805: if ((s = socket(res0->ai_family, res0->ai_socktype |
806: SOCK_NONBLOCK, res0->ai_protocol)) < 0)
1.21 ericj 807: continue;
808:
1.67 jmc 809: /* Bind to a local port or source address if specified. */
1.21 ericj 810: if (sflag || pflag) {
811: struct addrinfo ahints, *ares;
1.6 deraadt 812:
1.91 markus 813: /* try SO_BINDANY, but don't insist */
814: setsockopt(s, SOL_SOCKET, SO_BINDANY, &on, sizeof(on));
1.21 ericj 815: memset(&ahints, 0, sizeof(struct addrinfo));
816: ahints.ai_family = res0->ai_family;
817: ahints.ai_socktype = uflag ? SOCK_DGRAM : SOCK_STREAM;
818: ahints.ai_protocol = uflag ? IPPROTO_UDP : IPPROTO_TCP;
1.25 ericj 819: ahints.ai_flags = AI_PASSIVE;
1.38 jakob 820: if ((error = getaddrinfo(sflag, pflag, &ahints, &ares)))
1.56 stevesk 821: errx(1, "getaddrinfo: %s", gai_strerror(error));
1.21 ericj 822:
823: if (bind(s, (struct sockaddr *)ares->ai_addr,
1.62 millert 824: ares->ai_addrlen) < 0)
1.119 guenther 825: err(1, "bind failed");
1.21 ericj 826: freeaddrinfo(ares);
1.6 deraadt 827: }
1.81 marius 828:
1.127 jca 829: set_common_sockopts(s, res0->ai_family);
1.6 deraadt 830:
1.103 fgsch 831: if (timeout_connect(s, res0->ai_addr, res0->ai_addrlen) == 0)
1.6 deraadt 832: break;
1.71 mcbride 833: else if (vflag)
834: warn("connect to %s port %s (%s) failed", host, port,
835: uflag ? "udp" : "tcp");
1.34 jakob 836:
1.21 ericj 837: close(s);
838: s = -1;
839: } while ((res0 = res0->ai_next) != NULL);
840:
841: freeaddrinfo(res);
1.1 deraadt 842:
1.21 ericj 843: return (s);
1.103 fgsch 844: }
845:
846: int
847: timeout_connect(int s, const struct sockaddr *name, socklen_t namelen)
848: {
849: struct pollfd pfd;
850: socklen_t optlen;
1.132 bluhm 851: int optval;
1.103 fgsch 852: int ret;
853:
854: if ((ret = connect(s, name, namelen)) != 0 && errno == EINPROGRESS) {
855: pfd.fd = s;
856: pfd.events = POLLOUT;
857: if ((ret = poll(&pfd, 1, timeout)) == 1) {
858: optlen = sizeof(optval);
859: if ((ret = getsockopt(s, SOL_SOCKET, SO_ERROR,
860: &optval, &optlen)) == 0) {
861: errno = optval;
862: ret = optval == 0 ? 0 : -1;
863: }
864: } else if (ret == 0) {
865: errno = ETIMEDOUT;
866: ret = -1;
867: } else
868: err(1, "poll failed");
869: }
870:
871: return (ret);
1.7 deraadt 872: }
1.1 deraadt 873:
1.11 ericj 874: /*
1.21 ericj 875: * local_listen()
1.67 jmc 876: * Returns a socket listening on a local port, binds to specified source
877: * address. Returns -1 on failure.
1.11 ericj 878: */
1.21 ericj 879: int
1.37 jakob 880: local_listen(char *host, char *port, struct addrinfo hints)
1.21 ericj 881: {
882: struct addrinfo *res, *res0;
883: int s, ret, x = 1;
884: int error;
1.6 deraadt 885:
1.67 jmc 886: /* Allow nodename to be null. */
1.21 ericj 887: hints.ai_flags |= AI_PASSIVE;
1.7 deraadt 888:
1.21 ericj 889: /*
890: * In the case of binding to a wildcard address
891: * default to binding to an ipv4 address.
892: */
893: if (host == NULL && hints.ai_family == AF_UNSPEC)
894: hints.ai_family = AF_INET;
1.1 deraadt 895:
1.21 ericj 896: if ((error = getaddrinfo(host, port, &hints, &res)))
1.70 deraadt 897: errx(1, "getaddrinfo: %s", gai_strerror(error));
1.14 ericj 898:
1.21 ericj 899: res0 = res;
900: do {
901: if ((s = socket(res0->ai_family, res0->ai_socktype,
1.82 marius 902: res0->ai_protocol)) < 0)
1.21 ericj 903: continue;
1.93 claudio 904:
1.21 ericj 905: ret = setsockopt(s, SOL_SOCKET, SO_REUSEPORT, &x, sizeof(x));
906: if (ret == -1)
1.30 smart 907: err(1, NULL);
1.81 marius 908:
1.127 jca 909: set_common_sockopts(s, res0->ai_family);
1.1 deraadt 910:
1.21 ericj 911: if (bind(s, (struct sockaddr *)res0->ai_addr,
1.37 jakob 912: res0->ai_addrlen) == 0)
1.21 ericj 913: break;
1.1 deraadt 914:
1.21 ericj 915: close(s);
916: s = -1;
917: } while ((res0 = res0->ai_next) != NULL);
1.1 deraadt 918:
1.47 ericj 919: if (!uflag && s != -1) {
1.21 ericj 920: if (listen(s, 1) < 0)
1.57 stevesk 921: err(1, "listen");
1.12 ericj 922: }
1.1 deraadt 923:
1.21 ericj 924: freeaddrinfo(res);
1.1 deraadt 925:
1.21 ericj 926: return (s);
1.7 deraadt 927: }
928:
1.11 ericj 929: /*
1.21 ericj 930: * readwrite()
931: * Loop that polls on the network file descriptor and stdin.
1.11 ericj 932: */
1.21 ericj 933: void
1.133 beck 934: readwrite(int net_fd, struct tls *tls_ctx)
1.6 deraadt 935: {
1.125 tedu 936: struct pollfd pfd[4];
937: int stdin_fd = STDIN_FILENO;
938: int stdout_fd = STDOUT_FILENO;
939: unsigned char netinbuf[BUFSIZE];
940: size_t netinbufpos = 0;
941: unsigned char stdinbuf[BUFSIZE];
942: size_t stdinbufpos = 0;
1.130 chl 943: int n, num_fds;
1.125 tedu 944: ssize_t ret;
945:
946: /* don't read from stdin if requested */
947: if (dflag)
948: stdin_fd = -1;
949:
950: /* stdin */
951: pfd[POLL_STDIN].fd = stdin_fd;
952: pfd[POLL_STDIN].events = POLLIN;
953:
954: /* network out */
955: pfd[POLL_NETOUT].fd = net_fd;
956: pfd[POLL_NETOUT].events = 0;
957:
958: /* network in */
959: pfd[POLL_NETIN].fd = net_fd;
960: pfd[POLL_NETIN].events = POLLIN;
961:
962: /* stdout */
963: pfd[POLL_STDOUT].fd = stdout_fd;
964: pfd[POLL_STDOUT].events = 0;
965:
966: while (1) {
967: /* both inputs are gone, buffers are empty, we are done */
1.134 deraadt 968: if (pfd[POLL_STDIN].fd == -1 && pfd[POLL_NETIN].fd == -1 &&
969: stdinbufpos == 0 && netinbufpos == 0) {
1.125 tedu 970: close(net_fd);
971: return;
972: }
973: /* both outputs are gone, we can't continue */
974: if (pfd[POLL_NETOUT].fd == -1 && pfd[POLL_STDOUT].fd == -1) {
975: close(net_fd);
976: return;
977: }
978: /* listen and net in gone, queues empty, done */
1.134 deraadt 979: if (lflag && pfd[POLL_NETIN].fd == -1 &&
980: stdinbufpos == 0 && netinbufpos == 0) {
1.125 tedu 981: close(net_fd);
982: return;
983: }
1.21 ericj 984:
1.125 tedu 985: /* help says -i is for "wait between lines sent". We read and
986: * write arbitrary amounts of data, and we don't want to start
987: * scanning for newlines, so this is as good as it gets */
1.21 ericj 988: if (iflag)
989: sleep(iflag);
990:
1.125 tedu 991: /* poll */
992: num_fds = poll(pfd, 4, timeout);
993:
994: /* treat poll errors */
995: if (num_fds == -1) {
996: close(net_fd);
997: err(1, "polling error");
1.21 ericj 998: }
1.49 hugh 999:
1.125 tedu 1000: /* timeout happened */
1001: if (num_fds == 0)
1.49 hugh 1002: return;
1.21 ericj 1003:
1.125 tedu 1004: /* treat socket error conditions */
1005: for (n = 0; n < 4; n++) {
1006: if (pfd[n].revents & (POLLERR|POLLNVAL)) {
1007: pfd[n].fd = -1;
1.6 deraadt 1008: }
1.21 ericj 1009: }
1.125 tedu 1010: /* reading is possible after HUP */
1011: if (pfd[POLL_STDIN].events & POLLIN &&
1012: pfd[POLL_STDIN].revents & POLLHUP &&
1.134 deraadt 1013: !(pfd[POLL_STDIN].revents & POLLIN))
1014: pfd[POLL_STDIN].fd = -1;
1.125 tedu 1015:
1016: if (pfd[POLL_NETIN].events & POLLIN &&
1017: pfd[POLL_NETIN].revents & POLLHUP &&
1.134 deraadt 1018: !(pfd[POLL_NETIN].revents & POLLIN))
1019: pfd[POLL_NETIN].fd = -1;
1.125 tedu 1020:
1021: if (pfd[POLL_NETOUT].revents & POLLHUP) {
1022: if (Nflag)
1023: shutdown(pfd[POLL_NETOUT].fd, SHUT_WR);
1024: pfd[POLL_NETOUT].fd = -1;
1025: }
1026: /* if HUP, stop watching stdout */
1027: if (pfd[POLL_STDOUT].revents & POLLHUP)
1028: pfd[POLL_STDOUT].fd = -1;
1029: /* if no net out, stop watching stdin */
1030: if (pfd[POLL_NETOUT].fd == -1)
1031: pfd[POLL_STDIN].fd = -1;
1032: /* if no stdout, stop watching net in */
1033: if (pfd[POLL_STDOUT].fd == -1) {
1034: if (pfd[POLL_NETIN].fd != -1)
1035: shutdown(pfd[POLL_NETIN].fd, SHUT_RD);
1036: pfd[POLL_NETIN].fd = -1;
1037: }
1.21 ericj 1038:
1.125 tedu 1039: /* try to read from stdin */
1040: if (pfd[POLL_STDIN].revents & POLLIN && stdinbufpos < BUFSIZE) {
1041: ret = fillbuf(pfd[POLL_STDIN].fd, stdinbuf,
1.133 beck 1042: &stdinbufpos, NULL);
1043: if (ret == TLS_WANT_POLLIN)
1044: pfd[POLL_STDIN].events = POLLIN;
1045: else if (ret == TLS_WANT_POLLOUT)
1046: pfd[POLL_STDIN].events = POLLOUT;
1047: else if (ret == 0 || ret == -1)
1.125 tedu 1048: pfd[POLL_STDIN].fd = -1;
1049: /* read something - poll net out */
1050: if (stdinbufpos > 0)
1051: pfd[POLL_NETOUT].events = POLLOUT;
1052: /* filled buffer - remove self from polling */
1053: if (stdinbufpos == BUFSIZE)
1054: pfd[POLL_STDIN].events = 0;
1055: }
1056: /* try to write to network */
1057: if (pfd[POLL_NETOUT].revents & POLLOUT && stdinbufpos > 0) {
1058: ret = drainbuf(pfd[POLL_NETOUT].fd, stdinbuf,
1.133 beck 1059: &stdinbufpos, tls_ctx);
1060: if (ret == TLS_WANT_POLLIN)
1061: pfd[POLL_NETOUT].events = POLLIN;
1062: else if (ret == TLS_WANT_POLLOUT)
1063: pfd[POLL_NETOUT].events = POLLOUT;
1064: else if (ret == -1)
1.125 tedu 1065: pfd[POLL_NETOUT].fd = -1;
1066: /* buffer empty - remove self from polling */
1067: if (stdinbufpos == 0)
1068: pfd[POLL_NETOUT].events = 0;
1069: /* buffer no longer full - poll stdin again */
1070: if (stdinbufpos < BUFSIZE)
1071: pfd[POLL_STDIN].events = POLLIN;
1072: }
1073: /* try to read from network */
1074: if (pfd[POLL_NETIN].revents & POLLIN && netinbufpos < BUFSIZE) {
1075: ret = fillbuf(pfd[POLL_NETIN].fd, netinbuf,
1.133 beck 1076: &netinbufpos, tls_ctx);
1077: if (ret == TLS_WANT_POLLIN)
1078: pfd[POLL_NETIN].events = POLLIN;
1079: else if (ret == TLS_WANT_POLLOUT)
1080: pfd[POLL_NETIN].events = POLLOUT;
1081: else if (ret == -1)
1.125 tedu 1082: pfd[POLL_NETIN].fd = -1;
1083: /* eof on net in - remove from pfd */
1084: if (ret == 0) {
1085: shutdown(pfd[POLL_NETIN].fd, SHUT_RD);
1086: pfd[POLL_NETIN].fd = -1;
1.50 vincent 1087: }
1.125 tedu 1088: /* read something - poll stdout */
1089: if (netinbufpos > 0)
1090: pfd[POLL_STDOUT].events = POLLOUT;
1091: /* filled buffer - remove self from polling */
1092: if (netinbufpos == BUFSIZE)
1093: pfd[POLL_NETIN].events = 0;
1094: /* handle telnet */
1095: if (tflag)
1096: atelnet(pfd[POLL_NETIN].fd, netinbuf,
1097: netinbufpos);
1098: }
1099: /* try to write to stdout */
1100: if (pfd[POLL_STDOUT].revents & POLLOUT && netinbufpos > 0) {
1101: ret = drainbuf(pfd[POLL_STDOUT].fd, netinbuf,
1.133 beck 1102: &netinbufpos, NULL);
1103: if (ret == TLS_WANT_POLLIN)
1104: pfd[POLL_STDOUT].events = POLLIN;
1105: else if (ret == TLS_WANT_POLLOUT)
1106: pfd[POLL_STDOUT].events = POLLOUT;
1107: else if (ret == -1)
1.125 tedu 1108: pfd[POLL_STDOUT].fd = -1;
1109: /* buffer empty - remove self from polling */
1110: if (netinbufpos == 0)
1111: pfd[POLL_STDOUT].events = 0;
1112: /* buffer no longer full - poll net in again */
1113: if (netinbufpos < BUFSIZE)
1114: pfd[POLL_NETIN].events = POLLIN;
1115: }
1116:
1117: /* stdin gone and queue empty? */
1118: if (pfd[POLL_STDIN].fd == -1 && stdinbufpos == 0) {
1119: if (pfd[POLL_NETOUT].fd != -1 && Nflag)
1120: shutdown(pfd[POLL_NETOUT].fd, SHUT_WR);
1121: pfd[POLL_NETOUT].fd = -1;
1122: }
1123: /* net in gone and queue empty? */
1124: if (pfd[POLL_NETIN].fd == -1 && netinbufpos == 0) {
1125: pfd[POLL_STDOUT].fd = -1;
1.21 ericj 1126: }
1.11 ericj 1127: }
1.125 tedu 1128: }
1129:
1130: ssize_t
1.133 beck 1131: drainbuf(int fd, unsigned char *buf, size_t *bufpos, struct tls *tls)
1.125 tedu 1132: {
1133: ssize_t n;
1134: ssize_t adjust;
1135:
1.133 beck 1136: if (tls)
1137: n = tls_write(tls, buf, *bufpos);
1138: else {
1139: n = write(fd, buf, *bufpos);
1140: /* don't treat EAGAIN, EINTR as error */
1141: if (n == -1 && (errno == EAGAIN || errno == EINTR))
1142: n = TLS_WANT_POLLOUT;
1143: }
1.125 tedu 1144: if (n <= 0)
1145: return n;
1146: /* adjust buffer */
1147: adjust = *bufpos - n;
1148: if (adjust > 0)
1149: memmove(buf, buf + n, adjust);
1150: *bufpos -= n;
1151: return n;
1152: }
1153:
1154: ssize_t
1.133 beck 1155: fillbuf(int fd, unsigned char *buf, size_t *bufpos, struct tls *tls)
1.125 tedu 1156: {
1157: size_t num = BUFSIZE - *bufpos;
1158: ssize_t n;
1159:
1.133 beck 1160: if (tls)
1161: n = tls_read(tls, buf + *bufpos, num);
1162: else {
1163: n = read(fd, buf + *bufpos, num);
1164: /* don't treat EAGAIN, EINTR as error */
1165: if (n == -1 && (errno == EAGAIN || errno == EINTR))
1166: n = TLS_WANT_POLLIN;
1167: }
1.125 tedu 1168: if (n <= 0)
1169: return n;
1170: *bufpos += n;
1171: return n;
1.113 djm 1172: }
1173:
1174: /*
1175: * fdpass()
1176: * Pass the connected file descriptor to stdout and exit.
1177: */
1178: void
1179: fdpass(int nfd)
1180: {
1181: struct msghdr mh;
1182: union {
1183: struct cmsghdr hdr;
1184: char buf[CMSG_SPACE(sizeof(int))];
1185: } cmsgbuf;
1186: struct cmsghdr *cmsg;
1187: struct iovec iov;
1188: char c = '\0';
1189: ssize_t r;
1190: struct pollfd pfd;
1191:
1192: /* Avoid obvious stupidity */
1193: if (isatty(STDOUT_FILENO))
1194: errx(1, "Cannot pass file descriptor to tty");
1195:
1196: bzero(&mh, sizeof(mh));
1197: bzero(&cmsgbuf, sizeof(cmsgbuf));
1198: bzero(&iov, sizeof(iov));
1199:
1200: mh.msg_control = (caddr_t)&cmsgbuf.buf;
1201: mh.msg_controllen = sizeof(cmsgbuf.buf);
1202: cmsg = CMSG_FIRSTHDR(&mh);
1203: cmsg->cmsg_len = CMSG_LEN(sizeof(int));
1204: cmsg->cmsg_level = SOL_SOCKET;
1205: cmsg->cmsg_type = SCM_RIGHTS;
1206: *(int *)CMSG_DATA(cmsg) = nfd;
1207:
1208: iov.iov_base = &c;
1209: iov.iov_len = 1;
1210: mh.msg_iov = &iov;
1211: mh.msg_iovlen = 1;
1212:
1213: bzero(&pfd, sizeof(pfd));
1214: pfd.fd = STDOUT_FILENO;
1.128 tobias 1215: pfd.events = POLLOUT;
1.113 djm 1216: for (;;) {
1217: r = sendmsg(STDOUT_FILENO, &mh, 0);
1218: if (r == -1) {
1219: if (errno == EAGAIN || errno == EINTR) {
1220: if (poll(&pfd, 1, -1) == -1)
1221: err(1, "poll");
1222: continue;
1223: }
1224: err(1, "sendmsg");
1.128 tobias 1225: } else if (r != 1)
1.113 djm 1226: errx(1, "sendmsg: unexpected return value %zd", r);
1227: else
1228: break;
1229: }
1230: exit(0);
1.7 deraadt 1231: }
1.50 vincent 1232:
1.67 jmc 1233: /* Deal with RFC 854 WILL/WONT DO/DONT negotiation. */
1.21 ericj 1234: void
1.37 jakob 1235: atelnet(int nfd, unsigned char *buf, unsigned int size)
1.6 deraadt 1236: {
1.24 ericj 1237: unsigned char *p, *end;
1238: unsigned char obuf[4];
1239:
1.95 nicm 1240: if (size < 3)
1241: return;
1242: end = buf + size - 2;
1.24 ericj 1243:
1244: for (p = buf; p < end; p++) {
1.21 ericj 1245: if (*p != IAC)
1.95 nicm 1246: continue;
1.24 ericj 1247:
1.25 ericj 1248: obuf[0] = IAC;
1.24 ericj 1249: p++;
1.50 vincent 1250: if ((*p == WILL) || (*p == WONT))
1.24 ericj 1251: obuf[1] = DONT;
1.95 nicm 1252: else if ((*p == DO) || (*p == DONT))
1.24 ericj 1253: obuf[1] = WONT;
1.95 nicm 1254: else
1255: continue;
1256:
1257: p++;
1258: obuf[2] = *p;
1259: if (atomicio(vwrite, nfd, obuf, 3) != 3)
1260: warn("Write Error!");
1.11 ericj 1261: }
1.7 deraadt 1262: }
1263:
1.11 ericj 1264: /*
1.21 ericj 1265: * build_ports()
1.105 lum 1266: * Build an array of ports in portlist[], listing each port
1.67 jmc 1267: * that we should try to connect to.
1.11 ericj 1268: */
1.21 ericj 1269: void
1.37 jakob 1270: build_ports(char *p)
1.6 deraadt 1271: {
1.88 ray 1272: const char *errstr;
1273: char *n;
1.21 ericj 1274: int hi, lo, cp;
1275: int x = 0;
1276:
1277: if ((n = strchr(p, '-')) != NULL) {
1278: *n = '\0';
1279: n++;
1280:
1.67 jmc 1281: /* Make sure the ports are in order: lowest->highest. */
1.88 ray 1282: hi = strtonum(n, 1, PORT_MAX, &errstr);
1283: if (errstr)
1284: errx(1, "port number %s: %s", errstr, n);
1285: lo = strtonum(p, 1, PORT_MAX, &errstr);
1286: if (errstr)
1287: errx(1, "port number %s: %s", errstr, p);
1.21 ericj 1288:
1289: if (lo > hi) {
1290: cp = hi;
1291: hi = lo;
1292: lo = cp;
1293: }
1294:
1.67 jmc 1295: /* Load ports sequentially. */
1.21 ericj 1296: for (cp = lo; cp <= hi; cp++) {
1.55 fgsch 1297: portlist[x] = calloc(1, PORT_MAX_LEN);
1298: if (portlist[x] == NULL)
1299: err(1, NULL);
1300: snprintf(portlist[x], PORT_MAX_LEN, "%d", cp);
1.21 ericj 1301: x++;
1302: }
1303:
1.67 jmc 1304: /* Randomly swap ports. */
1.21 ericj 1305: if (rflag) {
1306: int y;
1307: char *c;
1308:
1309: for (x = 0; x <= (hi - lo); x++) {
1310: y = (arc4random() & 0xFFFF) % (hi - lo);
1311: c = portlist[x];
1312: portlist[x] = portlist[y];
1313: portlist[y] = c;
1.6 deraadt 1314: }
1.11 ericj 1315: }
1.21 ericj 1316: } else {
1.88 ray 1317: hi = strtonum(p, 1, PORT_MAX, &errstr);
1318: if (errstr)
1319: errx(1, "port number %s: %s", errstr, p);
1.96 nicm 1320: portlist[0] = strdup(p);
1.55 fgsch 1321: if (portlist[0] == NULL)
1322: err(1, NULL);
1.11 ericj 1323: }
1.13 ericj 1324: }
1325:
1326: /*
1.21 ericj 1327: * udptest()
1328: * Do a few writes to see if the UDP port is there.
1.105 lum 1329: * Fails once PF state table is full.
1.13 ericj 1330: */
1.21 ericj 1331: int
1.37 jakob 1332: udptest(int s)
1.13 ericj 1333: {
1.74 deraadt 1334: int i, ret;
1.13 ericj 1335:
1.52 vincent 1336: for (i = 0; i <= 3; i++) {
1.74 deraadt 1337: if (write(s, "X", 1) == 1)
1.21 ericj 1338: ret = 1;
1.14 ericj 1339: else
1.21 ericj 1340: ret = -1;
1.14 ericj 1341: }
1.21 ericj 1342: return (ret);
1.81 marius 1343: }
1344:
1.84 dtucker 1345: void
1.127 jca 1346: set_common_sockopts(int s, int af)
1.81 marius 1347: {
1348: int x = 1;
1349:
1350: if (Sflag) {
1351: if (setsockopt(s, IPPROTO_TCP, TCP_MD5SIG,
1352: &x, sizeof(x)) == -1)
1353: err(1, NULL);
1354: }
1355: if (Dflag) {
1356: if (setsockopt(s, SOL_SOCKET, SO_DEBUG,
1357: &x, sizeof(x)) == -1)
1358: err(1, NULL);
1359: }
1.83 dtucker 1360: if (Tflag != -1) {
1.127 jca 1361: int proto, option;
1362:
1363: if (af == AF_INET6) {
1364: proto = IPPROTO_IPV6;
1365: option = IPV6_TCLASS;
1366: } else {
1367: proto = IPPROTO_IP;
1368: option = IP_TOS;
1369: }
1370:
1371: if (setsockopt(s, proto, option, &Tflag, sizeof(Tflag)) == -1)
1.83 dtucker 1372: err(1, "set IP ToS");
1373: }
1.90 djm 1374: if (Iflag) {
1375: if (setsockopt(s, SOL_SOCKET, SO_RCVBUF,
1376: &Iflag, sizeof(Iflag)) == -1)
1377: err(1, "set TCP receive buffer size");
1378: }
1379: if (Oflag) {
1380: if (setsockopt(s, SOL_SOCKET, SO_SNDBUF,
1381: &Oflag, sizeof(Oflag)) == -1)
1382: err(1, "set TCP send buffer size");
1383: }
1.83 dtucker 1384: }
1385:
1386: int
1.102 haesbaer 1387: map_tos(char *s, int *val)
1.83 dtucker 1388: {
1.102 haesbaer 1389: /* DiffServ Codepoints and other TOS mappings */
1390: const struct toskeywords {
1391: const char *keyword;
1392: int val;
1393: } *t, toskeywords[] = {
1394: { "af11", IPTOS_DSCP_AF11 },
1395: { "af12", IPTOS_DSCP_AF12 },
1396: { "af13", IPTOS_DSCP_AF13 },
1397: { "af21", IPTOS_DSCP_AF21 },
1398: { "af22", IPTOS_DSCP_AF22 },
1399: { "af23", IPTOS_DSCP_AF23 },
1400: { "af31", IPTOS_DSCP_AF31 },
1401: { "af32", IPTOS_DSCP_AF32 },
1402: { "af33", IPTOS_DSCP_AF33 },
1403: { "af41", IPTOS_DSCP_AF41 },
1404: { "af42", IPTOS_DSCP_AF42 },
1405: { "af43", IPTOS_DSCP_AF43 },
1406: { "critical", IPTOS_PREC_CRITIC_ECP },
1407: { "cs0", IPTOS_DSCP_CS0 },
1408: { "cs1", IPTOS_DSCP_CS1 },
1409: { "cs2", IPTOS_DSCP_CS2 },
1410: { "cs3", IPTOS_DSCP_CS3 },
1411: { "cs4", IPTOS_DSCP_CS4 },
1412: { "cs5", IPTOS_DSCP_CS5 },
1413: { "cs6", IPTOS_DSCP_CS6 },
1414: { "cs7", IPTOS_DSCP_CS7 },
1415: { "ef", IPTOS_DSCP_EF },
1416: { "inetcontrol", IPTOS_PREC_INTERNETCONTROL },
1417: { "lowdelay", IPTOS_LOWDELAY },
1418: { "netcontrol", IPTOS_PREC_NETCONTROL },
1419: { "reliability", IPTOS_RELIABILITY },
1420: { "throughput", IPTOS_THROUGHPUT },
1.134 deraadt 1421: { NULL, -1 },
1.102 haesbaer 1422: };
1423:
1424: for (t = toskeywords; t->keyword != NULL; t++) {
1425: if (strcmp(s, t->keyword) == 0) {
1426: *val = t->val;
1427: return (1);
1428: }
1429: }
1.83 dtucker 1430:
1.102 haesbaer 1431: return (0);
1.108 haesbaer 1432: }
1433:
1.133 beck 1434: int
1435: map_tls(char *s, int *val)
1436: {
1437: const struct tlskeywords {
1438: const char *keyword;
1439: int val;
1440: } *t, tlskeywords[] = {
1441: { "tlslegacy", TLS_LEGACY },
1442: { "noverify", TLS_NOVERIFY },
1443: { "noname", TLS_NONAME },
1444: { "clientcert", TLS_CCERT},
1.134 deraadt 1445: { NULL, -1 },
1.133 beck 1446: };
1447:
1448: for (t = tlskeywords; t->keyword != NULL; t++) {
1449: if (strcmp(s, t->keyword) == 0) {
1450: *val |= t->val;
1451: return (1);
1452: }
1453: }
1454: return (0);
1455: }
1456:
1457: void
1458: report_tls(struct tls * tls_ctx, char * host, char *tls_expectname)
1459: {
1460: char *subject = NULL, *issuer = NULL;
1.138 beck 1461: fprintf(stderr, "TLS handshake negotiated %s/%s with host %s\n",
1462: tls_conn_version(tls_ctx), tls_conn_cipher(tls_ctx), host);
1.133 beck 1463: fprintf(stderr, "Peer name %s\n",
1464: tls_expectname ? tls_expectname : host);
1.137 beck 1465: if (tls_peer_cert_subject(tls_ctx))
1466: fprintf(stderr, "Subject: %s\n",
1467: tls_peer_cert_subject(tls_ctx));
1468: if (tls_peer_cert_issuer(tls_ctx))
1469: fprintf(stderr, "Issuer: %s\n",
1470: tls_peer_cert_issuer(tls_ctx));
1471: if (tls_peer_cert_hash(tls_ctx))
1472: fprintf(stderr, "Cert Hash: %s\n",
1473: tls_peer_cert_hash(tls_ctx));
1.133 beck 1474: free(subject);
1475: free(issuer);
1476: }
1.108 haesbaer 1477: void
1478: report_connect(const struct sockaddr *sa, socklen_t salen)
1479: {
1480: char remote_host[NI_MAXHOST];
1481: char remote_port[NI_MAXSERV];
1482: int herr;
1483: int flags = NI_NUMERICSERV;
1.134 deraadt 1484:
1.108 haesbaer 1485: if (nflag)
1486: flags |= NI_NUMERICHOST;
1.134 deraadt 1487:
1.108 haesbaer 1488: if ((herr = getnameinfo(sa, salen,
1489: remote_host, sizeof(remote_host),
1490: remote_port, sizeof(remote_port),
1491: flags)) != 0) {
1492: if (herr == EAI_SYSTEM)
1493: err(1, "getnameinfo");
1494: else
1495: errx(1, "getnameinfo: %s", gai_strerror(herr));
1496: }
1.134 deraadt 1497:
1.108 haesbaer 1498: fprintf(stderr,
1499: "Connection from %s %s "
1500: "received!\n", remote_host, remote_port);
1.7 deraadt 1501: }
1.1 deraadt 1502:
1.11 ericj 1503: void
1.58 deraadt 1504: help(void)
1.1 deraadt 1505: {
1.21 ericj 1506: usage(0);
1507: fprintf(stderr, "\tCommand Summary:\n\
1508: \t-4 Use IPv4\n\
1509: \t-6 Use IPv6\n\
1.135 jmc 1510: \t-C certfile Public key file\n\
1511: \t-c Use TLS\n\
1.73 markus 1512: \t-D Enable the debug socket option\n\
1.69 tedu 1513: \t-d Detach from stdin\n\
1.135 jmc 1514: \t-e name\t Required name in peer certificate\n\
1.114 jmc 1515: \t-F Pass socket fd\n\
1.135 jmc 1516: \t-H hash\t Hash string of peer certificate\n\
1.21 ericj 1517: \t-h This help text\n\
1.90 djm 1518: \t-I length TCP receive buffer length\n\
1.135 jmc 1519: \t-i interval Delay interval for lines sent, ports scanned\n\
1520: \t-K keyfile Private key file\n\
1.21 ericj 1521: \t-k Keep inbound sockets open for multiple connects\n\
1522: \t-l Listen mode, for inbound connects\n\
1.111 sthen 1523: \t-N Shutdown the network socket after EOF on stdin\n\
1.22 jasoni 1524: \t-n Suppress name/port resolutions\n\
1.90 djm 1525: \t-O length TCP send buffer length\n\
1.86 djm 1526: \t-P proxyuser\tUsername for proxy authentication\n\
1.36 jakob 1527: \t-p port\t Specify local port for remote connects\n\
1.135 jmc 1528: \t-R CAfile CA bundle\n\
1.21 ericj 1529: \t-r Randomize remote ports\n\
1.67 jmc 1530: \t-S Enable the TCP MD5 signature option\n\
1.135 jmc 1531: \t-s source Local source address\n\
1532: \t-T keyword TOS value or TLS options\n\
1.21 ericj 1533: \t-t Answer TELNET negotiation\n\
1.67 jmc 1534: \t-U Use UNIX domain socket\n\
1.21 ericj 1535: \t-u UDP mode\n\
1.98 guenther 1536: \t-V rtable Specify alternate routing table\n\
1.21 ericj 1537: \t-v Verbose\n\
1.135 jmc 1538: \t-w timeout Timeout for connects and final net reads\n\
1.75 djm 1539: \t-X proto Proxy protocol: \"4\", \"5\" (SOCKS) or \"connect\"\n\
1540: \t-x addr[:port]\tSpecify proxy address and port\n\
1.21 ericj 1541: \t-z Zero-I/O mode [used for scanning]\n\
1542: Port numbers can be individual or ranges: lo-hi [inclusive]\n");
1543: exit(1);
1.11 ericj 1544: }
1545:
1546: void
1.37 jakob 1547: usage(int ret)
1.11 ericj 1548: {
1.92 sobrado 1549: fprintf(stderr,
1.135 jmc 1550: "usage: nc [-46cDdFhklNnrStUuvz] [-C certfile] [-e name] "
1551: "[-H hash] [-I length]\n"
1552: "\t [-i interval] [-K keyfile] [-O length] [-P proxy_username]\n"
1553: "\t [-p source_port] [-R CAfile] [-s source] "
1554: "[-T keyword] [-V rtable]\n"
1555: "\t [-w timeout] [-X proxy_protocol] [-x proxy_address[:port]]\n"
1.133 beck 1556: "\t [destination] [port]\n");
1.21 ericj 1557: if (ret)
1558: exit(1);
1.7 deraadt 1559: }
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