Annotation of src/usr.bin/nc/netcat.c, Revision 1.148
1.148 ! mmcc 1: /* $OpenBSD: netcat.c,v 1.147 2015/12/16 14:23:33 beck 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 */
1.146 beck 107: uint8_t *cacert;
108: size_t cacertlen;
109: uint8_t *privkey;
110: size_t privkeylen;
111: uint8_t *pubcert;
112: size_t pubcertlen;
1.133 beck 113:
1.49 hugh 114: int timeout = -1;
1.21 ericj 115: int family = AF_UNSPEC;
1.63 miod 116: char *portlist[PORT_MAX+1];
1.99 jeremy 117: char *unix_dg_tmp_socket;
1.21 ericj 118:
1.40 millert 119: void atelnet(int, unsigned char *, unsigned int);
120: void build_ports(char *);
121: void help(void);
122: int local_listen(char *, char *, struct addrinfo);
1.133 beck 123: void readwrite(int, struct tls *);
1.113 djm 124: void fdpass(int nfd) __attribute__((noreturn));
1.77 otto 125: int remote_connect(const char *, const char *, struct addrinfo);
1.103 fgsch 126: int timeout_connect(int, const struct sockaddr *, socklen_t);
1.86 djm 127: int socks_connect(const char *, const char *, struct addrinfo,
128: const char *, const char *, struct addrinfo, int, const char *);
1.40 millert 129: int udptest(int);
1.136 deraadt 130: int unix_bind(char *, int);
1.42 ericj 131: int unix_connect(char *);
132: int unix_listen(char *);
1.127 jca 133: void set_common_sockopts(int, int);
1.102 haesbaer 134: int map_tos(char *, int *);
1.133 beck 135: int map_tls(char *, int *);
1.108 haesbaer 136: void report_connect(const struct sockaddr *, socklen_t);
1.134 deraadt 137: void report_tls(struct tls *tls_ctx, char * host, char *tls_expectname);
1.40 millert 138: void usage(int);
1.133 beck 139: ssize_t drainbuf(int, unsigned char *, size_t *, struct tls *);
140: ssize_t fillbuf(int, unsigned char *, size_t *, struct tls *);
141: void tls_setup_client(struct tls *, int, char *);
1.134 deraadt 142: struct tls *tls_setup_server(struct tls *, int, char *);
1.1 deraadt 143:
1.21 ericj 144: int
1.37 jakob 145: main(int argc, char *argv[])
1.21 ericj 146: {
1.46 markus 147: int ch, s, ret, socksv;
1.88 ray 148: char *host, *uport;
1.21 ericj 149: struct addrinfo hints;
1.29 smart 150: struct servent *sv;
1.21 ericj 151: socklen_t len;
1.76 hshoexer 152: struct sockaddr_storage cliaddr;
1.34 jakob 153: char *proxy;
1.88 ray 154: const char *errstr, *proxyhost = "", *proxyport = NULL;
1.34 jakob 155: struct addrinfo proxyhints;
1.99 jeremy 156: char unix_dg_tmp_socket_buf[UNIX_DG_TMP_SOCKET_SIZE];
1.133 beck 157: struct tls_config *tls_cfg = NULL;
158: struct tls *tls_ctx = NULL;
1.11 ericj 159:
1.29 smart 160: ret = 1;
161: s = 0;
1.46 markus 162: socksv = 5;
1.29 smart 163: host = NULL;
164: uport = NULL;
165: sv = NULL;
1.129 tobias 166:
167: signal(SIGPIPE, SIG_IGN);
1.29 smart 168:
1.80 mcbride 169: while ((ch = getopt(argc, argv,
1.133 beck 170: "46C:cDde:FH:hI:i:K:klNnO:P:p:R:rSs:T:tUuV:vw:X:x:z")) != -1) {
1.21 ericj 171: switch (ch) {
172: case '4':
173: family = AF_INET;
174: break;
175: case '6':
176: family = AF_INET6;
177: break;
1.42 ericj 178: case 'U':
179: family = AF_UNIX;
180: break;
1.46 markus 181: case 'X':
1.75 djm 182: if (strcasecmp(optarg, "connect") == 0)
183: socksv = -1; /* HTTP proxy CONNECT */
184: else if (strcmp(optarg, "4") == 0)
185: socksv = 4; /* SOCKS v.4 */
186: else if (strcmp(optarg, "5") == 0)
187: socksv = 5; /* SOCKS v.5 */
188: else
189: errx(1, "unsupported proxy protocol");
1.46 markus 190: break;
1.133 beck 191: case 'C':
192: Cflag = optarg;
193: break;
194: case 'c':
195: usetls = 1;
196: break;
1.68 tedu 197: case 'd':
198: dflag = 1;
199: break;
1.133 beck 200: case 'e':
201: tls_expectname = optarg;
202: break;
1.113 djm 203: case 'F':
204: Fflag = 1;
205: break;
1.133 beck 206: case 'H':
207: tls_expecthash = optarg;
208: break;
1.21 ericj 209: case 'h':
210: help();
211: break;
212: case 'i':
1.88 ray 213: iflag = strtonum(optarg, 0, UINT_MAX, &errstr);
214: if (errstr)
215: errx(1, "interval %s: %s", errstr, optarg);
1.21 ericj 216: break;
1.133 beck 217: case 'K':
218: Kflag = optarg;
219: break;
1.21 ericj 220: case 'k':
221: kflag = 1;
222: break;
223: case 'l':
224: lflag = 1;
225: break;
1.111 sthen 226: case 'N':
227: Nflag = 1;
228: break;
1.21 ericj 229: case 'n':
230: nflag = 1;
231: break;
1.86 djm 232: case 'P':
233: Pflag = optarg;
234: break;
1.21 ericj 235: case 'p':
236: pflag = optarg;
237: break;
1.133 beck 238: case 'R':
239: tls_cachanged = 1;
240: Rflag = optarg;
241: break;
1.21 ericj 242: case 'r':
243: rflag = 1;
244: break;
245: case 's':
246: sflag = optarg;
247: break;
248: case 't':
249: tflag = 1;
250: break;
251: case 'u':
252: uflag = 1;
253: break;
1.93 claudio 254: case 'V':
1.117 sthen 255: rtableid = (int)strtonum(optarg, 0,
1.93 claudio 256: RT_TABLEID_MAX, &errstr);
257: if (errstr)
1.98 guenther 258: errx(1, "rtable %s: %s", errstr, optarg);
1.93 claudio 259: break;
1.21 ericj 260: case 'v':
261: vflag = 1;
262: break;
1.70 deraadt 263: case 'w':
1.88 ray 264: timeout = strtonum(optarg, 0, INT_MAX / 1000, &errstr);
265: if (errstr)
266: errx(1, "timeout %s: %s", errstr, optarg);
1.49 hugh 267: timeout *= 1000;
1.21 ericj 268: break;
1.34 jakob 269: case 'x':
270: xflag = 1;
1.64 deraadt 271: if ((proxy = strdup(optarg)) == NULL)
272: err(1, NULL);
1.34 jakob 273: break;
1.21 ericj 274: case 'z':
275: zflag = 1;
276: break;
1.73 markus 277: case 'D':
278: Dflag = 1;
279: break;
1.90 djm 280: case 'I':
281: Iflag = strtonum(optarg, 1, 65536 << 14, &errstr);
282: if (errstr != NULL)
283: errx(1, "TCP receive window %s: %s",
284: errstr, optarg);
285: break;
286: case 'O':
287: Oflag = strtonum(optarg, 1, 65536 << 14, &errstr);
288: if (errstr != NULL)
289: errx(1, "TCP send window %s: %s",
290: errstr, optarg);
291: break;
1.65 markus 292: case 'S':
293: Sflag = 1;
294: break;
1.83 dtucker 295: case 'T':
1.102 haesbaer 296: errstr = NULL;
297: errno = 0;
298: if (map_tos(optarg, &Tflag))
299: break;
1.133 beck 300: if (map_tls(optarg, &TLSopt))
301: break;
1.102 haesbaer 302: if (strlen(optarg) > 1 && optarg[0] == '0' &&
303: optarg[1] == 'x')
304: Tflag = (int)strtol(optarg, NULL, 16);
305: else
306: Tflag = (int)strtonum(optarg, 0, 255,
307: &errstr);
308: if (Tflag < 0 || Tflag > 255 || errstr || errno)
1.133 beck 309: errx(1, "illegal tos/tls value %s", optarg);
1.83 dtucker 310: break;
1.21 ericj 311: default:
312: usage(1);
313: }
314: }
315: argc -= optind;
316: argv += optind;
1.11 ericj 317:
1.143 deraadt 318: if (rtableid >= 0)
1.142 benno 319: if (setrtable(rtableid) == -1)
320: err(1, "setrtable");
1.143 deraadt 321:
1.142 benno 322: if (family == AF_UNIX) {
1.140 beck 323: if (pledge("stdio rpath wpath cpath tmppath unix", NULL) == -1)
324: err(1, "pledge");
1.143 deraadt 325: } else if (Fflag) {
1.140 beck 326: if (pledge("stdio inet dns sendfd", NULL) == -1)
327: err(1, "pledge");
1.143 deraadt 328: } else if (usetls) {
1.140 beck 329: if (pledge("stdio rpath inet dns", NULL) == -1)
330: err(1, "pledge");
1.143 deraadt 331: } else if (pledge("stdio inet dns", NULL) == -1)
1.140 beck 332: err(1, "pledge");
333:
1.21 ericj 334: /* Cruft to make sure options are clean, and used properly. */
1.42 ericj 335: if (argv[0] && !argv[1] && family == AF_UNIX) {
336: host = argv[0];
337: uport = NULL;
338: } else if (argv[0] && !argv[1]) {
1.21 ericj 339: if (!lflag)
340: usage(1);
341: uport = argv[0];
342: host = NULL;
343: } else if (argv[0] && argv[1]) {
344: host = argv[0];
345: uport = argv[1];
346: } else
347: usage(1);
1.1 deraadt 348:
1.21 ericj 349: if (lflag && sflag)
350: errx(1, "cannot use -s and -l");
351: if (lflag && pflag)
352: errx(1, "cannot use -p and -l");
353: if (lflag && zflag)
1.32 ericj 354: errx(1, "cannot use -z and -l");
1.21 ericj 355: if (!lflag && kflag)
1.32 ericj 356: errx(1, "must use -l with -k");
1.133 beck 357: if (uflag && usetls)
358: errx(1, "cannot use -c and -u");
359: if ((family == AF_UNIX) && usetls)
360: errx(1, "cannot use -c and -U");
1.140 beck 361: if ((family == AF_UNIX) && Fflag)
362: errx(1, "cannot use -F and -U");
363: if (Fflag && usetls)
364: errx(1, "cannot use -c and -F");
1.133 beck 365: if (TLSopt && !usetls)
366: errx(1, "you must specify -c to use TLS options");
367: if (Cflag && !usetls)
368: errx(1, "you must specify -c to use -C");
369: if (Kflag && !usetls)
370: errx(1, "you must specify -c to use -K");
371: if (tls_cachanged && !usetls)
372: errx(1, "you must specify -c to use -R");
373: if (tls_expecthash && !usetls)
374: errx(1, "you must specify -c to use -H");
375: if (tls_expectname && !usetls)
376: errx(1, "you must specify -c to use -e");
1.21 ericj 377:
1.99 jeremy 378: /* Get name of temporary socket for unix datagram client */
379: if ((family == AF_UNIX) && uflag && !lflag) {
380: if (sflag) {
381: unix_dg_tmp_socket = sflag;
382: } else {
383: strlcpy(unix_dg_tmp_socket_buf, "/tmp/nc.XXXXXXXXXX",
1.136 deraadt 384: UNIX_DG_TMP_SOCKET_SIZE);
1.99 jeremy 385: if (mktemp(unix_dg_tmp_socket_buf) == NULL)
386: err(1, "mktemp");
387: unix_dg_tmp_socket = unix_dg_tmp_socket_buf;
388: }
389: }
390:
1.67 jmc 391: /* Initialize addrinfo structure. */
1.42 ericj 392: if (family != AF_UNIX) {
393: memset(&hints, 0, sizeof(struct addrinfo));
394: hints.ai_family = family;
395: hints.ai_socktype = uflag ? SOCK_DGRAM : SOCK_STREAM;
396: hints.ai_protocol = uflag ? IPPROTO_UDP : IPPROTO_TCP;
397: if (nflag)
398: hints.ai_flags |= AI_NUMERICHOST;
399: }
1.1 deraadt 400:
1.34 jakob 401: if (xflag) {
402: if (uflag)
403: errx(1, "no proxy support for UDP mode");
404:
405: if (lflag)
406: errx(1, "no proxy support for listen");
407:
1.42 ericj 408: if (family == AF_UNIX)
409: errx(1, "no proxy support for unix sockets");
410:
1.34 jakob 411: /* XXX IPv6 transport to proxy would probably work */
412: if (family == AF_INET6)
413: errx(1, "no proxy support for IPv6");
414:
415: if (sflag)
416: errx(1, "no proxy support for local source address");
417:
418: proxyhost = strsep(&proxy, ":");
419: proxyport = proxy;
420:
421: memset(&proxyhints, 0, sizeof(struct addrinfo));
422: proxyhints.ai_family = family;
423: proxyhints.ai_socktype = SOCK_STREAM;
424: proxyhints.ai_protocol = IPPROTO_TCP;
425: if (nflag)
426: proxyhints.ai_flags |= AI_NUMERICHOST;
427: }
428:
1.133 beck 429: if (usetls) {
1.146 beck 430: if (Rflag && (cacert=tls_load_file(Rflag, &cacertlen, NULL)) == NULL)
431: errx(1, "unable to load root CA file %s", Rflag);
432: if (Cflag && (pubcert=tls_load_file(Rflag, &pubcertlen, NULL)) == NULL)
433: errx(1, "unable to load TLS certificate file %s", Cflag);
434: if (Kflag && (privkey=tls_load_file(Rflag, &privkeylen, NULL)) == NULL)
435: errx(1, "unable to load TLS key file %s", Kflag);
436:
437: if (pledge("stdio inet dns", NULL) == -1)
438: err(1, "pledge");
439:
1.133 beck 440: if (tls_init() == -1)
441: errx(1, "unable to initialize TLS");
442: if ((tls_cfg = tls_config_new()) == NULL)
443: errx(1, "unable to allocate TLS config");
1.146 beck 444: if (Rflag && tls_config_set_ca_mem(tls_cfg, cacert, cacertlen) == -1)
445: errx(1, "unable to set root CA file %s", Rflag);
446: if (Cflag && tls_config_set_cert_mem(tls_cfg, cacert, cacertlen) == -1)
1.133 beck 447: errx(1, "unable to set TLS certificate file %s", Cflag);
1.146 beck 448: if (Kflag && tls_config_set_key_mem(tls_cfg, privkey, privkeylen) == -1)
1.133 beck 449: errx(1, "unable to set TLS key file %s", Kflag);
450: if (TLSopt & TLS_LEGACY) {
451: tls_config_set_protocols(tls_cfg, TLS_PROTOCOLS_ALL);
452: tls_config_set_ciphers(tls_cfg, "legacy");
453: }
454: if (!lflag && (TLSopt & TLS_CCERT))
455: errx(1, "clientcert is only valid with -l");
456: if (TLSopt & TLS_NONAME)
457: tls_config_insecure_noverifyname(tls_cfg);
458: if (TLSopt & TLS_NOVERIFY) {
459: if (tls_expecthash != NULL)
460: errx(1, "-H and -T noverify may not be used"
461: "together");
462: tls_config_insecure_noverifycert(tls_cfg);
463: }
464: }
1.21 ericj 465: if (lflag) {
1.133 beck 466: struct tls *tls_cctx = NULL;
1.21 ericj 467: int connfd;
1.27 ericj 468: ret = 0;
1.1 deraadt 469:
1.99 jeremy 470: if (family == AF_UNIX) {
471: if (uflag)
1.136 deraadt 472: s = unix_bind(host, 0);
1.99 jeremy 473: else
474: s = unix_listen(host);
475: }
1.42 ericj 476:
1.133 beck 477: if (usetls) {
478: tls_config_verify_client_optional(tls_cfg);
479: if ((tls_ctx = tls_server()) == NULL)
480: errx(1, "tls server creation failed");
481: if (tls_configure(tls_ctx, tls_cfg) == -1)
482: errx(1, "tls configuration failed (%s)",
483: tls_error(tls_ctx));
484: }
1.67 jmc 485: /* Allow only one connection at a time, but stay alive. */
1.21 ericj 486: for (;;) {
1.42 ericj 487: if (family != AF_UNIX)
488: s = local_listen(host, uport, hints);
489: if (s < 0)
1.30 smart 490: err(1, NULL);
1.21 ericj 491: /*
1.109 haesbaer 492: * For UDP and -k, don't connect the socket, let it
493: * receive datagrams from multiple socket pairs.
1.21 ericj 494: */
1.109 haesbaer 495: if (uflag && kflag)
1.133 beck 496: readwrite(s, NULL);
1.109 haesbaer 497: /*
498: * For UDP and not -k, we will use recvfrom() initially
499: * to wait for a caller, then use the regular functions
500: * to talk to the caller.
501: */
502: else if (uflag && !kflag) {
1.80 mcbride 503: int rv, plen;
1.97 nicm 504: char buf[16384];
1.21 ericj 505: struct sockaddr_storage z;
506:
507: len = sizeof(z);
1.106 dlg 508: plen = 2048;
1.80 mcbride 509: rv = recvfrom(s, buf, plen, MSG_PEEK,
1.37 jakob 510: (struct sockaddr *)&z, &len);
1.23 ericj 511: if (rv < 0)
1.57 stevesk 512: err(1, "recvfrom");
1.21 ericj 513:
1.37 jakob 514: rv = connect(s, (struct sockaddr *)&z, len);
1.23 ericj 515: if (rv < 0)
1.57 stevesk 516: err(1, "connect");
1.1 deraadt 517:
1.108 haesbaer 518: if (vflag)
519: report_connect((struct sockaddr *)&z, len);
520:
1.133 beck 521: readwrite(s, NULL);
1.21 ericj 522: } else {
1.78 otto 523: len = sizeof(cliaddr);
1.132 bluhm 524: connfd = accept4(s, (struct sockaddr *)&cliaddr,
525: &len, SOCK_NONBLOCK);
1.110 deraadt 526: if (connfd == -1) {
527: /* For now, all errnos are fatal */
1.125 tedu 528: err(1, "accept");
1.110 deraadt 529: }
1.108 haesbaer 530: if (vflag)
531: report_connect((struct sockaddr *)&cliaddr, len);
1.133 beck 532: if ((usetls) &&
1.134 deraadt 533: (tls_cctx = tls_setup_server(tls_ctx, connfd, host)))
1.133 beck 534: readwrite(connfd, tls_cctx);
535: if (!usetls)
536: readwrite(connfd, NULL);
537: if (tls_cctx) {
538: int i;
1.136 deraadt 539:
1.133 beck 540: do {
541: i = tls_close(tls_cctx);
542: } while (i == TLS_WANT_POLLIN ||
543: i == TLS_WANT_POLLOUT);
544: tls_free(tls_cctx);
545: tls_cctx = NULL;
546: }
1.99 jeremy 547: close(connfd);
1.21 ericj 548: }
1.42 ericj 549: if (family != AF_UNIX)
550: close(s);
1.99 jeremy 551: else if (uflag) {
552: if (connect(s, NULL, 0) < 0)
553: err(1, "connect");
554: }
1.27 ericj 555:
1.21 ericj 556: if (!kflag)
557: break;
1.11 ericj 558: }
1.42 ericj 559: } else if (family == AF_UNIX) {
560: ret = 0;
561:
562: if ((s = unix_connect(host)) > 0 && !zflag) {
1.133 beck 563: readwrite(s, NULL);
1.42 ericj 564: close(s);
565: } else
566: ret = 1;
567:
1.99 jeremy 568: if (uflag)
569: unlink(unix_dg_tmp_socket);
1.42 ericj 570: exit(ret);
571:
1.21 ericj 572: } else {
573: int i = 0;
1.6 deraadt 574:
1.67 jmc 575: /* Construct the portlist[] array. */
1.21 ericj 576: build_ports(uport);
1.1 deraadt 577:
1.67 jmc 578: /* Cycle through portlist, connecting to each port. */
1.21 ericj 579: for (i = 0; portlist[i] != NULL; i++) {
580: if (s)
581: close(s);
1.34 jakob 582:
1.133 beck 583: if (usetls) {
584: if ((tls_ctx = tls_client()) == NULL)
585: errx(1, "tls client creation failed");
586: if (tls_configure(tls_ctx, tls_cfg) == -1)
587: errx(1, "tls configuration failed (%s)",
588: tls_error(tls_ctx));
589: }
1.34 jakob 590: if (xflag)
591: s = socks_connect(host, portlist[i], hints,
1.86 djm 592: proxyhost, proxyport, proxyhints, socksv,
593: Pflag);
1.34 jakob 594: else
595: s = remote_connect(host, portlist[i], hints);
596:
597: if (s < 0)
1.21 ericj 598: continue;
1.1 deraadt 599:
1.21 ericj 600: ret = 0;
601: if (vflag || zflag) {
1.67 jmc 602: /* For UDP, make sure we are connected. */
1.21 ericj 603: if (uflag) {
1.50 vincent 604: if (udptest(s) == -1) {
1.21 ericj 605: ret = 1;
606: continue;
607: }
608: }
1.1 deraadt 609:
1.67 jmc 610: /* Don't look up port if -n. */
1.21 ericj 611: if (nflag)
612: sv = NULL;
613: else {
614: sv = getservbyport(
1.37 jakob 615: ntohs(atoi(portlist[i])),
616: uflag ? "udp" : "tcp");
1.21 ericj 617: }
1.50 vincent 618:
1.94 mpf 619: fprintf(stderr,
620: "Connection to %s %s port [%s/%s] "
621: "succeeded!\n", host, portlist[i],
622: uflag ? "udp" : "tcp",
1.37 jakob 623: sv ? sv->s_name : "*");
1.21 ericj 624: }
1.113 djm 625: if (Fflag)
626: fdpass(s);
1.133 beck 627: else {
628: if (usetls)
629: tls_setup_client(tls_ctx, s, host);
630: if (!zflag)
631: readwrite(s, tls_ctx);
632: if (tls_ctx) {
633: int j;
1.136 deraadt 634:
1.133 beck 635: do {
636: j = tls_close(tls_ctx);
637: } while (j == TLS_WANT_POLLIN ||
638: j == TLS_WANT_POLLOUT);
639: tls_free(tls_ctx);
640: tls_ctx = NULL;
641: }
642: }
1.7 deraadt 643: }
1.11 ericj 644: }
1.1 deraadt 645:
1.21 ericj 646: if (s)
647: close(s);
648:
1.133 beck 649: tls_config_free(tls_cfg);
650:
1.21 ericj 651: exit(ret);
1.7 deraadt 652: }
1.1 deraadt 653:
1.11 ericj 654: /*
1.99 jeremy 655: * unix_bind()
656: * Returns a unix socket bound to the given path
1.42 ericj 657: */
658: int
1.136 deraadt 659: unix_bind(char *path, int flags)
1.42 ericj 660: {
1.144 bcook 661: struct sockaddr_un s_un;
1.42 ericj 662: int s;
663:
1.99 jeremy 664: /* Create unix domain socket. */
1.136 deraadt 665: if ((s = socket(AF_UNIX, flags | (uflag ? SOCK_DGRAM : SOCK_STREAM),
666: 0)) < 0)
1.50 vincent 667: return (-1);
1.42 ericj 668:
1.144 bcook 669: memset(&s_un, 0, sizeof(struct sockaddr_un));
670: s_un.sun_family = AF_UNIX;
1.60 avsm 671:
1.144 bcook 672: if (strlcpy(s_un.sun_path, path, sizeof(s_un.sun_path)) >=
673: sizeof(s_un.sun_path)) {
1.60 avsm 674: close(s);
675: errno = ENAMETOOLONG;
676: return (-1);
677: }
1.99 jeremy 678:
1.144 bcook 679: if (bind(s, (struct sockaddr *)&s_un, sizeof(s_un)) < 0) {
1.50 vincent 680: close(s);
681: return (-1);
1.42 ericj 682: }
683: return (s);
684: }
685:
1.133 beck 686: void
687: tls_setup_client(struct tls *tls_ctx, int s, char *host)
688: {
689: int i;
1.136 deraadt 690:
1.133 beck 691: if (tls_connect_socket(tls_ctx, s,
692: tls_expectname ? tls_expectname : host) == -1) {
693: errx(1, "tls connection failed (%s)",
694: tls_error(tls_ctx));
695: }
696: do {
697: if ((i = tls_handshake(tls_ctx)) == -1)
698: errx(1, "tls handshake failed (%s)",
699: tls_error(tls_ctx));
700: } while (i == TLS_WANT_POLLIN || i == TLS_WANT_POLLOUT);
701: if (vflag)
702: report_tls(tls_ctx, host, tls_expectname);
1.137 beck 703: if (tls_expecthash && tls_peer_cert_hash(tls_ctx) &&
704: strcmp(tls_expecthash, tls_peer_cert_hash(tls_ctx)) != 0)
1.133 beck 705: errx(1, "peer certificate is not %s", tls_expecthash);
706: }
1.141 deraadt 707:
1.133 beck 708: struct tls *
709: tls_setup_server(struct tls *tls_ctx, int connfd, char *host)
710: {
711: struct tls *tls_cctx;
1.136 deraadt 712:
1.133 beck 713: if (tls_accept_socket(tls_ctx, &tls_cctx,
714: connfd) == -1) {
715: warnx("tls accept failed (%s)",
716: tls_error(tls_ctx));
717: tls_cctx = NULL;
718: } else {
719: int i;
1.136 deraadt 720:
1.133 beck 721: do {
722: if ((i = tls_handshake(tls_cctx)) == -1)
723: warnx("tls handshake failed (%s)",
724: tls_error(tls_cctx));
725: } while(i == TLS_WANT_POLLIN || i == TLS_WANT_POLLOUT);
726: }
727: if (tls_cctx) {
728: int gotcert = tls_peer_cert_provided(tls_cctx);
1.136 deraadt 729:
1.133 beck 730: if (vflag && gotcert)
731: report_tls(tls_cctx, host, tls_expectname);
732: if ((TLSopt & TLS_CCERT) && !gotcert)
733: warnx("No client certificate provided");
1.137 beck 734: else if (gotcert && tls_peer_cert_hash(tls_ctx) && tls_expecthash &&
735: strcmp(tls_expecthash, tls_peer_cert_hash(tls_ctx)) != 0)
1.133 beck 736: warnx("peer certificate is not %s", tls_expecthash);
737: else if (gotcert && tls_expectname &&
1.134 deraadt 738: (!tls_peer_cert_contains_name(tls_cctx, tls_expectname)))
1.133 beck 739: warnx("name (%s) not found in client cert",
740: tls_expectname);
741: else {
742: return tls_cctx;
743: }
744: }
745: return NULL;
746: }
1.141 deraadt 747:
1.42 ericj 748: /*
1.99 jeremy 749: * unix_connect()
750: * Returns a socket connected to a local unix socket. Returns -1 on failure.
1.42 ericj 751: */
752: int
1.99 jeremy 753: unix_connect(char *path)
1.42 ericj 754: {
1.144 bcook 755: struct sockaddr_un s_un;
1.42 ericj 756: int s;
757:
1.99 jeremy 758: if (uflag) {
1.136 deraadt 759: if ((s = unix_bind(unix_dg_tmp_socket, SOCK_CLOEXEC)) < 0)
1.99 jeremy 760: return (-1);
761: } else {
1.136 deraadt 762: if ((s = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0)) < 0)
1.99 jeremy 763: return (-1);
764: }
1.42 ericj 765:
1.144 bcook 766: memset(&s_un, 0, sizeof(struct sockaddr_un));
767: s_un.sun_family = AF_UNIX;
1.60 avsm 768:
1.144 bcook 769: if (strlcpy(s_un.sun_path, path, sizeof(s_un.sun_path)) >=
770: sizeof(s_un.sun_path)) {
1.60 avsm 771: close(s);
772: errno = ENAMETOOLONG;
773: return (-1);
774: }
1.144 bcook 775: if (connect(s, (struct sockaddr *)&s_un, sizeof(s_un)) < 0) {
1.42 ericj 776: close(s);
777: return (-1);
778: }
1.99 jeremy 779: return (s);
780:
781: }
782:
783: /*
784: * unix_listen()
785: * Create a unix domain socket, and listen on it.
786: */
787: int
788: unix_listen(char *path)
789: {
790: int s;
1.136 deraadt 791: if ((s = unix_bind(path, 0)) < 0)
1.99 jeremy 792: return (-1);
1.42 ericj 793:
794: if (listen(s, 5) < 0) {
795: close(s);
796: return (-1);
797: }
798: return (s);
799: }
800:
801: /*
1.21 ericj 802: * remote_connect()
1.67 jmc 803: * Returns a socket connected to a remote host. Properly binds to a local
804: * port or source address if needed. Returns -1 on failure.
1.11 ericj 805: */
1.21 ericj 806: int
1.77 otto 807: remote_connect(const char *host, const char *port, struct addrinfo hints)
1.21 ericj 808: {
809: struct addrinfo *res, *res0;
1.91 markus 810: int s, error, on = 1;
1.21 ericj 811:
812: if ((error = getaddrinfo(host, port, &hints, &res)))
1.56 stevesk 813: errx(1, "getaddrinfo: %s", gai_strerror(error));
1.21 ericj 814:
815: res0 = res;
816: do {
1.132 bluhm 817: if ((s = socket(res0->ai_family, res0->ai_socktype |
818: SOCK_NONBLOCK, res0->ai_protocol)) < 0)
1.21 ericj 819: continue;
820:
1.67 jmc 821: /* Bind to a local port or source address if specified. */
1.21 ericj 822: if (sflag || pflag) {
823: struct addrinfo ahints, *ares;
1.6 deraadt 824:
1.91 markus 825: /* try SO_BINDANY, but don't insist */
826: setsockopt(s, SOL_SOCKET, SO_BINDANY, &on, sizeof(on));
1.21 ericj 827: memset(&ahints, 0, sizeof(struct addrinfo));
828: ahints.ai_family = res0->ai_family;
829: ahints.ai_socktype = uflag ? SOCK_DGRAM : SOCK_STREAM;
830: ahints.ai_protocol = uflag ? IPPROTO_UDP : IPPROTO_TCP;
1.25 ericj 831: ahints.ai_flags = AI_PASSIVE;
1.38 jakob 832: if ((error = getaddrinfo(sflag, pflag, &ahints, &ares)))
1.56 stevesk 833: errx(1, "getaddrinfo: %s", gai_strerror(error));
1.21 ericj 834:
835: if (bind(s, (struct sockaddr *)ares->ai_addr,
1.62 millert 836: ares->ai_addrlen) < 0)
1.119 guenther 837: err(1, "bind failed");
1.21 ericj 838: freeaddrinfo(ares);
1.6 deraadt 839: }
1.81 marius 840:
1.127 jca 841: set_common_sockopts(s, res0->ai_family);
1.6 deraadt 842:
1.103 fgsch 843: if (timeout_connect(s, res0->ai_addr, res0->ai_addrlen) == 0)
1.6 deraadt 844: break;
1.143 deraadt 845: if (vflag)
1.71 mcbride 846: warn("connect to %s port %s (%s) failed", host, port,
847: uflag ? "udp" : "tcp");
1.34 jakob 848:
1.21 ericj 849: close(s);
850: s = -1;
851: } while ((res0 = res0->ai_next) != NULL);
852:
853: freeaddrinfo(res);
1.1 deraadt 854:
1.21 ericj 855: return (s);
1.103 fgsch 856: }
857:
858: int
859: timeout_connect(int s, const struct sockaddr *name, socklen_t namelen)
860: {
861: struct pollfd pfd;
862: socklen_t optlen;
1.132 bluhm 863: int optval;
1.103 fgsch 864: int ret;
865:
866: if ((ret = connect(s, name, namelen)) != 0 && errno == EINPROGRESS) {
867: pfd.fd = s;
868: pfd.events = POLLOUT;
869: if ((ret = poll(&pfd, 1, timeout)) == 1) {
870: optlen = sizeof(optval);
871: if ((ret = getsockopt(s, SOL_SOCKET, SO_ERROR,
872: &optval, &optlen)) == 0) {
873: errno = optval;
874: ret = optval == 0 ? 0 : -1;
875: }
876: } else if (ret == 0) {
877: errno = ETIMEDOUT;
878: ret = -1;
879: } else
880: err(1, "poll failed");
881: }
882:
883: return (ret);
1.7 deraadt 884: }
1.1 deraadt 885:
1.11 ericj 886: /*
1.21 ericj 887: * local_listen()
1.67 jmc 888: * Returns a socket listening on a local port, binds to specified source
889: * address. Returns -1 on failure.
1.11 ericj 890: */
1.21 ericj 891: int
1.37 jakob 892: local_listen(char *host, char *port, struct addrinfo hints)
1.21 ericj 893: {
894: struct addrinfo *res, *res0;
895: int s, ret, x = 1;
896: int error;
1.6 deraadt 897:
1.67 jmc 898: /* Allow nodename to be null. */
1.21 ericj 899: hints.ai_flags |= AI_PASSIVE;
1.7 deraadt 900:
1.21 ericj 901: /*
902: * In the case of binding to a wildcard address
903: * default to binding to an ipv4 address.
904: */
905: if (host == NULL && hints.ai_family == AF_UNSPEC)
906: hints.ai_family = AF_INET;
1.1 deraadt 907:
1.21 ericj 908: if ((error = getaddrinfo(host, port, &hints, &res)))
1.70 deraadt 909: errx(1, "getaddrinfo: %s", gai_strerror(error));
1.14 ericj 910:
1.21 ericj 911: res0 = res;
912: do {
913: if ((s = socket(res0->ai_family, res0->ai_socktype,
1.82 marius 914: res0->ai_protocol)) < 0)
1.21 ericj 915: continue;
1.93 claudio 916:
1.21 ericj 917: ret = setsockopt(s, SOL_SOCKET, SO_REUSEPORT, &x, sizeof(x));
918: if (ret == -1)
1.30 smart 919: err(1, NULL);
1.81 marius 920:
1.127 jca 921: set_common_sockopts(s, res0->ai_family);
1.1 deraadt 922:
1.21 ericj 923: if (bind(s, (struct sockaddr *)res0->ai_addr,
1.37 jakob 924: res0->ai_addrlen) == 0)
1.21 ericj 925: break;
1.1 deraadt 926:
1.21 ericj 927: close(s);
928: s = -1;
929: } while ((res0 = res0->ai_next) != NULL);
1.1 deraadt 930:
1.47 ericj 931: if (!uflag && s != -1) {
1.21 ericj 932: if (listen(s, 1) < 0)
1.57 stevesk 933: err(1, "listen");
1.12 ericj 934: }
1.1 deraadt 935:
1.21 ericj 936: freeaddrinfo(res);
1.1 deraadt 937:
1.21 ericj 938: return (s);
1.7 deraadt 939: }
940:
1.11 ericj 941: /*
1.21 ericj 942: * readwrite()
943: * Loop that polls on the network file descriptor and stdin.
1.11 ericj 944: */
1.21 ericj 945: void
1.133 beck 946: readwrite(int net_fd, struct tls *tls_ctx)
1.6 deraadt 947: {
1.125 tedu 948: struct pollfd pfd[4];
949: int stdin_fd = STDIN_FILENO;
950: int stdout_fd = STDOUT_FILENO;
951: unsigned char netinbuf[BUFSIZE];
952: size_t netinbufpos = 0;
953: unsigned char stdinbuf[BUFSIZE];
954: size_t stdinbufpos = 0;
1.130 chl 955: int n, num_fds;
1.125 tedu 956: ssize_t ret;
957:
958: /* don't read from stdin if requested */
959: if (dflag)
960: stdin_fd = -1;
961:
962: /* stdin */
963: pfd[POLL_STDIN].fd = stdin_fd;
964: pfd[POLL_STDIN].events = POLLIN;
965:
966: /* network out */
967: pfd[POLL_NETOUT].fd = net_fd;
968: pfd[POLL_NETOUT].events = 0;
969:
970: /* network in */
971: pfd[POLL_NETIN].fd = net_fd;
972: pfd[POLL_NETIN].events = POLLIN;
973:
974: /* stdout */
975: pfd[POLL_STDOUT].fd = stdout_fd;
976: pfd[POLL_STDOUT].events = 0;
977:
978: while (1) {
979: /* both inputs are gone, buffers are empty, we are done */
1.134 deraadt 980: if (pfd[POLL_STDIN].fd == -1 && pfd[POLL_NETIN].fd == -1 &&
981: stdinbufpos == 0 && netinbufpos == 0) {
1.125 tedu 982: close(net_fd);
983: return;
984: }
985: /* both outputs are gone, we can't continue */
986: if (pfd[POLL_NETOUT].fd == -1 && pfd[POLL_STDOUT].fd == -1) {
987: close(net_fd);
988: return;
989: }
990: /* listen and net in gone, queues empty, done */
1.134 deraadt 991: if (lflag && pfd[POLL_NETIN].fd == -1 &&
992: stdinbufpos == 0 && netinbufpos == 0) {
1.125 tedu 993: close(net_fd);
994: return;
995: }
1.21 ericj 996:
1.125 tedu 997: /* help says -i is for "wait between lines sent". We read and
998: * write arbitrary amounts of data, and we don't want to start
999: * scanning for newlines, so this is as good as it gets */
1.21 ericj 1000: if (iflag)
1001: sleep(iflag);
1002:
1.125 tedu 1003: /* poll */
1004: num_fds = poll(pfd, 4, timeout);
1005:
1006: /* treat poll errors */
1007: if (num_fds == -1) {
1008: close(net_fd);
1009: err(1, "polling error");
1.21 ericj 1010: }
1.49 hugh 1011:
1.125 tedu 1012: /* timeout happened */
1013: if (num_fds == 0)
1.49 hugh 1014: return;
1.21 ericj 1015:
1.125 tedu 1016: /* treat socket error conditions */
1017: for (n = 0; n < 4; n++) {
1018: if (pfd[n].revents & (POLLERR|POLLNVAL)) {
1019: pfd[n].fd = -1;
1.6 deraadt 1020: }
1.21 ericj 1021: }
1.125 tedu 1022: /* reading is possible after HUP */
1023: if (pfd[POLL_STDIN].events & POLLIN &&
1024: pfd[POLL_STDIN].revents & POLLHUP &&
1.134 deraadt 1025: !(pfd[POLL_STDIN].revents & POLLIN))
1026: pfd[POLL_STDIN].fd = -1;
1.125 tedu 1027:
1028: if (pfd[POLL_NETIN].events & POLLIN &&
1029: pfd[POLL_NETIN].revents & POLLHUP &&
1.134 deraadt 1030: !(pfd[POLL_NETIN].revents & POLLIN))
1031: pfd[POLL_NETIN].fd = -1;
1.125 tedu 1032:
1033: if (pfd[POLL_NETOUT].revents & POLLHUP) {
1034: if (Nflag)
1035: shutdown(pfd[POLL_NETOUT].fd, SHUT_WR);
1036: pfd[POLL_NETOUT].fd = -1;
1037: }
1038: /* if HUP, stop watching stdout */
1039: if (pfd[POLL_STDOUT].revents & POLLHUP)
1040: pfd[POLL_STDOUT].fd = -1;
1041: /* if no net out, stop watching stdin */
1042: if (pfd[POLL_NETOUT].fd == -1)
1043: pfd[POLL_STDIN].fd = -1;
1044: /* if no stdout, stop watching net in */
1045: if (pfd[POLL_STDOUT].fd == -1) {
1046: if (pfd[POLL_NETIN].fd != -1)
1047: shutdown(pfd[POLL_NETIN].fd, SHUT_RD);
1048: pfd[POLL_NETIN].fd = -1;
1049: }
1.21 ericj 1050:
1.125 tedu 1051: /* try to read from stdin */
1052: if (pfd[POLL_STDIN].revents & POLLIN && stdinbufpos < BUFSIZE) {
1053: ret = fillbuf(pfd[POLL_STDIN].fd, stdinbuf,
1.133 beck 1054: &stdinbufpos, NULL);
1055: if (ret == TLS_WANT_POLLIN)
1056: pfd[POLL_STDIN].events = POLLIN;
1057: else if (ret == TLS_WANT_POLLOUT)
1058: pfd[POLL_STDIN].events = POLLOUT;
1059: else if (ret == 0 || ret == -1)
1.125 tedu 1060: pfd[POLL_STDIN].fd = -1;
1061: /* read something - poll net out */
1062: if (stdinbufpos > 0)
1063: pfd[POLL_NETOUT].events = POLLOUT;
1064: /* filled buffer - remove self from polling */
1065: if (stdinbufpos == BUFSIZE)
1066: pfd[POLL_STDIN].events = 0;
1067: }
1068: /* try to write to network */
1069: if (pfd[POLL_NETOUT].revents & POLLOUT && stdinbufpos > 0) {
1070: ret = drainbuf(pfd[POLL_NETOUT].fd, stdinbuf,
1.133 beck 1071: &stdinbufpos, tls_ctx);
1072: if (ret == TLS_WANT_POLLIN)
1073: pfd[POLL_NETOUT].events = POLLIN;
1074: else if (ret == TLS_WANT_POLLOUT)
1075: pfd[POLL_NETOUT].events = POLLOUT;
1076: else if (ret == -1)
1.125 tedu 1077: pfd[POLL_NETOUT].fd = -1;
1078: /* buffer empty - remove self from polling */
1079: if (stdinbufpos == 0)
1080: pfd[POLL_NETOUT].events = 0;
1081: /* buffer no longer full - poll stdin again */
1082: if (stdinbufpos < BUFSIZE)
1083: pfd[POLL_STDIN].events = POLLIN;
1084: }
1085: /* try to read from network */
1086: if (pfd[POLL_NETIN].revents & POLLIN && netinbufpos < BUFSIZE) {
1087: ret = fillbuf(pfd[POLL_NETIN].fd, netinbuf,
1.133 beck 1088: &netinbufpos, tls_ctx);
1089: if (ret == TLS_WANT_POLLIN)
1090: pfd[POLL_NETIN].events = POLLIN;
1091: else if (ret == TLS_WANT_POLLOUT)
1092: pfd[POLL_NETIN].events = POLLOUT;
1093: else if (ret == -1)
1.125 tedu 1094: pfd[POLL_NETIN].fd = -1;
1095: /* eof on net in - remove from pfd */
1096: if (ret == 0) {
1097: shutdown(pfd[POLL_NETIN].fd, SHUT_RD);
1098: pfd[POLL_NETIN].fd = -1;
1.50 vincent 1099: }
1.125 tedu 1100: /* read something - poll stdout */
1101: if (netinbufpos > 0)
1102: pfd[POLL_STDOUT].events = POLLOUT;
1103: /* filled buffer - remove self from polling */
1104: if (netinbufpos == BUFSIZE)
1105: pfd[POLL_NETIN].events = 0;
1106: /* handle telnet */
1107: if (tflag)
1108: atelnet(pfd[POLL_NETIN].fd, netinbuf,
1109: netinbufpos);
1110: }
1111: /* try to write to stdout */
1112: if (pfd[POLL_STDOUT].revents & POLLOUT && netinbufpos > 0) {
1113: ret = drainbuf(pfd[POLL_STDOUT].fd, netinbuf,
1.133 beck 1114: &netinbufpos, NULL);
1115: if (ret == TLS_WANT_POLLIN)
1116: pfd[POLL_STDOUT].events = POLLIN;
1117: else if (ret == TLS_WANT_POLLOUT)
1118: pfd[POLL_STDOUT].events = POLLOUT;
1119: else if (ret == -1)
1.125 tedu 1120: pfd[POLL_STDOUT].fd = -1;
1121: /* buffer empty - remove self from polling */
1122: if (netinbufpos == 0)
1123: pfd[POLL_STDOUT].events = 0;
1124: /* buffer no longer full - poll net in again */
1125: if (netinbufpos < BUFSIZE)
1126: pfd[POLL_NETIN].events = POLLIN;
1127: }
1128:
1129: /* stdin gone and queue empty? */
1130: if (pfd[POLL_STDIN].fd == -1 && stdinbufpos == 0) {
1131: if (pfd[POLL_NETOUT].fd != -1 && Nflag)
1132: shutdown(pfd[POLL_NETOUT].fd, SHUT_WR);
1133: pfd[POLL_NETOUT].fd = -1;
1134: }
1135: /* net in gone and queue empty? */
1136: if (pfd[POLL_NETIN].fd == -1 && netinbufpos == 0) {
1137: pfd[POLL_STDOUT].fd = -1;
1.21 ericj 1138: }
1.11 ericj 1139: }
1.125 tedu 1140: }
1141:
1142: ssize_t
1.133 beck 1143: drainbuf(int fd, unsigned char *buf, size_t *bufpos, struct tls *tls)
1.125 tedu 1144: {
1145: ssize_t n;
1146: ssize_t adjust;
1147:
1.133 beck 1148: if (tls)
1149: n = tls_write(tls, buf, *bufpos);
1150: else {
1151: n = write(fd, buf, *bufpos);
1152: /* don't treat EAGAIN, EINTR as error */
1153: if (n == -1 && (errno == EAGAIN || errno == EINTR))
1154: n = TLS_WANT_POLLOUT;
1155: }
1.125 tedu 1156: if (n <= 0)
1157: return n;
1158: /* adjust buffer */
1159: adjust = *bufpos - n;
1160: if (adjust > 0)
1161: memmove(buf, buf + n, adjust);
1162: *bufpos -= n;
1163: return n;
1164: }
1165:
1166: ssize_t
1.133 beck 1167: fillbuf(int fd, unsigned char *buf, size_t *bufpos, struct tls *tls)
1.125 tedu 1168: {
1169: size_t num = BUFSIZE - *bufpos;
1170: ssize_t n;
1171:
1.133 beck 1172: if (tls)
1173: n = tls_read(tls, buf + *bufpos, num);
1174: else {
1175: n = read(fd, buf + *bufpos, num);
1176: /* don't treat EAGAIN, EINTR as error */
1177: if (n == -1 && (errno == EAGAIN || errno == EINTR))
1178: n = TLS_WANT_POLLIN;
1179: }
1.125 tedu 1180: if (n <= 0)
1181: return n;
1182: *bufpos += n;
1183: return n;
1.113 djm 1184: }
1185:
1186: /*
1187: * fdpass()
1188: * Pass the connected file descriptor to stdout and exit.
1189: */
1190: void
1191: fdpass(int nfd)
1192: {
1193: struct msghdr mh;
1194: union {
1195: struct cmsghdr hdr;
1196: char buf[CMSG_SPACE(sizeof(int))];
1197: } cmsgbuf;
1198: struct cmsghdr *cmsg;
1199: struct iovec iov;
1200: char c = '\0';
1201: ssize_t r;
1202: struct pollfd pfd;
1203:
1204: /* Avoid obvious stupidity */
1205: if (isatty(STDOUT_FILENO))
1206: errx(1, "Cannot pass file descriptor to tty");
1207:
1208: bzero(&mh, sizeof(mh));
1209: bzero(&cmsgbuf, sizeof(cmsgbuf));
1210: bzero(&iov, sizeof(iov));
1211:
1212: mh.msg_control = (caddr_t)&cmsgbuf.buf;
1213: mh.msg_controllen = sizeof(cmsgbuf.buf);
1214: cmsg = CMSG_FIRSTHDR(&mh);
1215: cmsg->cmsg_len = CMSG_LEN(sizeof(int));
1216: cmsg->cmsg_level = SOL_SOCKET;
1217: cmsg->cmsg_type = SCM_RIGHTS;
1218: *(int *)CMSG_DATA(cmsg) = nfd;
1219:
1220: iov.iov_base = &c;
1221: iov.iov_len = 1;
1222: mh.msg_iov = &iov;
1223: mh.msg_iovlen = 1;
1224:
1225: bzero(&pfd, sizeof(pfd));
1226: pfd.fd = STDOUT_FILENO;
1.128 tobias 1227: pfd.events = POLLOUT;
1.113 djm 1228: for (;;) {
1229: r = sendmsg(STDOUT_FILENO, &mh, 0);
1230: if (r == -1) {
1231: if (errno == EAGAIN || errno == EINTR) {
1232: if (poll(&pfd, 1, -1) == -1)
1233: err(1, "poll");
1234: continue;
1235: }
1236: err(1, "sendmsg");
1.128 tobias 1237: } else if (r != 1)
1.113 djm 1238: errx(1, "sendmsg: unexpected return value %zd", r);
1239: else
1240: break;
1241: }
1242: exit(0);
1.7 deraadt 1243: }
1.50 vincent 1244:
1.67 jmc 1245: /* Deal with RFC 854 WILL/WONT DO/DONT negotiation. */
1.21 ericj 1246: void
1.37 jakob 1247: atelnet(int nfd, unsigned char *buf, unsigned int size)
1.6 deraadt 1248: {
1.24 ericj 1249: unsigned char *p, *end;
1250: unsigned char obuf[4];
1251:
1.95 nicm 1252: if (size < 3)
1253: return;
1254: end = buf + size - 2;
1.24 ericj 1255:
1256: for (p = buf; p < end; p++) {
1.21 ericj 1257: if (*p != IAC)
1.95 nicm 1258: continue;
1.24 ericj 1259:
1.25 ericj 1260: obuf[0] = IAC;
1.24 ericj 1261: p++;
1.50 vincent 1262: if ((*p == WILL) || (*p == WONT))
1.24 ericj 1263: obuf[1] = DONT;
1.95 nicm 1264: else if ((*p == DO) || (*p == DONT))
1.24 ericj 1265: obuf[1] = WONT;
1.95 nicm 1266: else
1267: continue;
1268:
1269: p++;
1270: obuf[2] = *p;
1271: if (atomicio(vwrite, nfd, obuf, 3) != 3)
1272: warn("Write Error!");
1.11 ericj 1273: }
1.7 deraadt 1274: }
1275:
1.11 ericj 1276: /*
1.21 ericj 1277: * build_ports()
1.105 lum 1278: * Build an array of ports in portlist[], listing each port
1.67 jmc 1279: * that we should try to connect to.
1.11 ericj 1280: */
1.21 ericj 1281: void
1.37 jakob 1282: build_ports(char *p)
1.6 deraadt 1283: {
1.88 ray 1284: const char *errstr;
1285: char *n;
1.21 ericj 1286: int hi, lo, cp;
1287: int x = 0;
1288:
1289: if ((n = strchr(p, '-')) != NULL) {
1290: *n = '\0';
1291: n++;
1292:
1.67 jmc 1293: /* Make sure the ports are in order: lowest->highest. */
1.88 ray 1294: hi = strtonum(n, 1, PORT_MAX, &errstr);
1295: if (errstr)
1296: errx(1, "port number %s: %s", errstr, n);
1297: lo = strtonum(p, 1, PORT_MAX, &errstr);
1298: if (errstr)
1299: errx(1, "port number %s: %s", errstr, p);
1.21 ericj 1300:
1301: if (lo > hi) {
1302: cp = hi;
1303: hi = lo;
1304: lo = cp;
1305: }
1306:
1.145 tb 1307: /*
1308: * Initialize portlist with a random permutation. Based on
1309: * Knuth, as in ip_randomid() in sys/netinet/ip_id.c.
1310: */
1.21 ericj 1311: if (rflag) {
1.145 tb 1312: for (x = 0; x <= hi - lo; x++) {
1313: cp = arc4random_uniform(x + 1);
1314: portlist[x] = portlist[cp];
1315: if (asprintf(&portlist[cp], "%d", x + lo) < 0)
1316: err(1, "asprintf");
1317: }
1318: } else { /* Load ports sequentially. */
1319: for (cp = lo; cp <= hi; cp++) {
1320: if (asprintf(&portlist[x], "%d", cp) < 0)
1321: err(1, "asprintf");
1322: x++;
1.6 deraadt 1323: }
1.11 ericj 1324: }
1.21 ericj 1325: } else {
1.88 ray 1326: hi = strtonum(p, 1, PORT_MAX, &errstr);
1327: if (errstr)
1328: errx(1, "port number %s: %s", errstr, p);
1.96 nicm 1329: portlist[0] = strdup(p);
1.55 fgsch 1330: if (portlist[0] == NULL)
1331: err(1, NULL);
1.11 ericj 1332: }
1.13 ericj 1333: }
1334:
1335: /*
1.21 ericj 1336: * udptest()
1337: * Do a few writes to see if the UDP port is there.
1.105 lum 1338: * Fails once PF state table is full.
1.13 ericj 1339: */
1.21 ericj 1340: int
1.37 jakob 1341: udptest(int s)
1.13 ericj 1342: {
1.74 deraadt 1343: int i, ret;
1.13 ericj 1344:
1.52 vincent 1345: for (i = 0; i <= 3; i++) {
1.74 deraadt 1346: if (write(s, "X", 1) == 1)
1.21 ericj 1347: ret = 1;
1.14 ericj 1348: else
1.21 ericj 1349: ret = -1;
1.14 ericj 1350: }
1.21 ericj 1351: return (ret);
1.81 marius 1352: }
1353:
1.84 dtucker 1354: void
1.127 jca 1355: set_common_sockopts(int s, int af)
1.81 marius 1356: {
1357: int x = 1;
1358:
1359: if (Sflag) {
1360: if (setsockopt(s, IPPROTO_TCP, TCP_MD5SIG,
1361: &x, sizeof(x)) == -1)
1362: err(1, NULL);
1363: }
1364: if (Dflag) {
1365: if (setsockopt(s, SOL_SOCKET, SO_DEBUG,
1366: &x, sizeof(x)) == -1)
1367: err(1, NULL);
1368: }
1.83 dtucker 1369: if (Tflag != -1) {
1.127 jca 1370: int proto, option;
1371:
1372: if (af == AF_INET6) {
1373: proto = IPPROTO_IPV6;
1374: option = IPV6_TCLASS;
1375: } else {
1376: proto = IPPROTO_IP;
1377: option = IP_TOS;
1378: }
1379:
1380: if (setsockopt(s, proto, option, &Tflag, sizeof(Tflag)) == -1)
1.83 dtucker 1381: err(1, "set IP ToS");
1382: }
1.90 djm 1383: if (Iflag) {
1384: if (setsockopt(s, SOL_SOCKET, SO_RCVBUF,
1385: &Iflag, sizeof(Iflag)) == -1)
1386: err(1, "set TCP receive buffer size");
1387: }
1388: if (Oflag) {
1389: if (setsockopt(s, SOL_SOCKET, SO_SNDBUF,
1390: &Oflag, sizeof(Oflag)) == -1)
1391: err(1, "set TCP send buffer size");
1392: }
1.83 dtucker 1393: }
1394:
1395: int
1.102 haesbaer 1396: map_tos(char *s, int *val)
1.83 dtucker 1397: {
1.102 haesbaer 1398: /* DiffServ Codepoints and other TOS mappings */
1399: const struct toskeywords {
1400: const char *keyword;
1401: int val;
1402: } *t, toskeywords[] = {
1403: { "af11", IPTOS_DSCP_AF11 },
1404: { "af12", IPTOS_DSCP_AF12 },
1405: { "af13", IPTOS_DSCP_AF13 },
1406: { "af21", IPTOS_DSCP_AF21 },
1407: { "af22", IPTOS_DSCP_AF22 },
1408: { "af23", IPTOS_DSCP_AF23 },
1409: { "af31", IPTOS_DSCP_AF31 },
1410: { "af32", IPTOS_DSCP_AF32 },
1411: { "af33", IPTOS_DSCP_AF33 },
1412: { "af41", IPTOS_DSCP_AF41 },
1413: { "af42", IPTOS_DSCP_AF42 },
1414: { "af43", IPTOS_DSCP_AF43 },
1415: { "critical", IPTOS_PREC_CRITIC_ECP },
1416: { "cs0", IPTOS_DSCP_CS0 },
1417: { "cs1", IPTOS_DSCP_CS1 },
1418: { "cs2", IPTOS_DSCP_CS2 },
1419: { "cs3", IPTOS_DSCP_CS3 },
1420: { "cs4", IPTOS_DSCP_CS4 },
1421: { "cs5", IPTOS_DSCP_CS5 },
1422: { "cs6", IPTOS_DSCP_CS6 },
1423: { "cs7", IPTOS_DSCP_CS7 },
1424: { "ef", IPTOS_DSCP_EF },
1425: { "inetcontrol", IPTOS_PREC_INTERNETCONTROL },
1426: { "lowdelay", IPTOS_LOWDELAY },
1427: { "netcontrol", IPTOS_PREC_NETCONTROL },
1428: { "reliability", IPTOS_RELIABILITY },
1429: { "throughput", IPTOS_THROUGHPUT },
1.134 deraadt 1430: { NULL, -1 },
1.102 haesbaer 1431: };
1432:
1433: for (t = toskeywords; t->keyword != NULL; t++) {
1434: if (strcmp(s, t->keyword) == 0) {
1435: *val = t->val;
1436: return (1);
1437: }
1438: }
1.83 dtucker 1439:
1.102 haesbaer 1440: return (0);
1.108 haesbaer 1441: }
1442:
1.133 beck 1443: int
1444: map_tls(char *s, int *val)
1445: {
1446: const struct tlskeywords {
1447: const char *keyword;
1448: int val;
1449: } *t, tlskeywords[] = {
1450: { "tlslegacy", TLS_LEGACY },
1451: { "noverify", TLS_NOVERIFY },
1452: { "noname", TLS_NONAME },
1453: { "clientcert", TLS_CCERT},
1.134 deraadt 1454: { NULL, -1 },
1.133 beck 1455: };
1456:
1457: for (t = tlskeywords; t->keyword != NULL; t++) {
1458: if (strcmp(s, t->keyword) == 0) {
1459: *val |= t->val;
1460: return (1);
1461: }
1462: }
1463: return (0);
1464: }
1465:
1466: void
1467: report_tls(struct tls * tls_ctx, char * host, char *tls_expectname)
1468: {
1.147 beck 1469: time_t t;
1.138 beck 1470: fprintf(stderr, "TLS handshake negotiated %s/%s with host %s\n",
1471: tls_conn_version(tls_ctx), tls_conn_cipher(tls_ctx), host);
1.148 ! mmcc 1472: fprintf(stderr, "Peer name: %s\n",
1.133 beck 1473: tls_expectname ? tls_expectname : host);
1.137 beck 1474: if (tls_peer_cert_subject(tls_ctx))
1475: fprintf(stderr, "Subject: %s\n",
1476: tls_peer_cert_subject(tls_ctx));
1477: if (tls_peer_cert_issuer(tls_ctx))
1478: fprintf(stderr, "Issuer: %s\n",
1479: tls_peer_cert_issuer(tls_ctx));
1.147 beck 1480: if ((t = tls_peer_cert_notbefore(tls_ctx)) != -1)
1481: fprintf(stderr, "Valid From: %s", ctime(&t));
1482: if ((t = tls_peer_cert_notafter(tls_ctx)) != -1)
1483: fprintf(stderr, "Valid Until: %s", ctime(&t));
1.137 beck 1484: if (tls_peer_cert_hash(tls_ctx))
1485: fprintf(stderr, "Cert Hash: %s\n",
1486: tls_peer_cert_hash(tls_ctx));
1.133 beck 1487: }
1.147 beck 1488:
1.108 haesbaer 1489: void
1490: report_connect(const struct sockaddr *sa, socklen_t salen)
1491: {
1492: char remote_host[NI_MAXHOST];
1493: char remote_port[NI_MAXSERV];
1494: int herr;
1495: int flags = NI_NUMERICSERV;
1.134 deraadt 1496:
1.108 haesbaer 1497: if (nflag)
1498: flags |= NI_NUMERICHOST;
1.134 deraadt 1499:
1.108 haesbaer 1500: if ((herr = getnameinfo(sa, salen,
1501: remote_host, sizeof(remote_host),
1502: remote_port, sizeof(remote_port),
1503: flags)) != 0) {
1504: if (herr == EAI_SYSTEM)
1505: err(1, "getnameinfo");
1506: else
1507: errx(1, "getnameinfo: %s", gai_strerror(herr));
1508: }
1.134 deraadt 1509:
1.108 haesbaer 1510: fprintf(stderr,
1511: "Connection from %s %s "
1512: "received!\n", remote_host, remote_port);
1.7 deraadt 1513: }
1.1 deraadt 1514:
1.11 ericj 1515: void
1.58 deraadt 1516: help(void)
1.1 deraadt 1517: {
1.21 ericj 1518: usage(0);
1519: fprintf(stderr, "\tCommand Summary:\n\
1520: \t-4 Use IPv4\n\
1521: \t-6 Use IPv6\n\
1.135 jmc 1522: \t-C certfile Public key file\n\
1523: \t-c Use TLS\n\
1.73 markus 1524: \t-D Enable the debug socket option\n\
1.69 tedu 1525: \t-d Detach from stdin\n\
1.135 jmc 1526: \t-e name\t Required name in peer certificate\n\
1.114 jmc 1527: \t-F Pass socket fd\n\
1.135 jmc 1528: \t-H hash\t Hash string of peer certificate\n\
1.21 ericj 1529: \t-h This help text\n\
1.90 djm 1530: \t-I length TCP receive buffer length\n\
1.135 jmc 1531: \t-i interval Delay interval for lines sent, ports scanned\n\
1532: \t-K keyfile Private key file\n\
1.21 ericj 1533: \t-k Keep inbound sockets open for multiple connects\n\
1534: \t-l Listen mode, for inbound connects\n\
1.111 sthen 1535: \t-N Shutdown the network socket after EOF on stdin\n\
1.22 jasoni 1536: \t-n Suppress name/port resolutions\n\
1.90 djm 1537: \t-O length TCP send buffer length\n\
1.86 djm 1538: \t-P proxyuser\tUsername for proxy authentication\n\
1.36 jakob 1539: \t-p port\t Specify local port for remote connects\n\
1.135 jmc 1540: \t-R CAfile CA bundle\n\
1.21 ericj 1541: \t-r Randomize remote ports\n\
1.67 jmc 1542: \t-S Enable the TCP MD5 signature option\n\
1.135 jmc 1543: \t-s source Local source address\n\
1544: \t-T keyword TOS value or TLS options\n\
1.21 ericj 1545: \t-t Answer TELNET negotiation\n\
1.67 jmc 1546: \t-U Use UNIX domain socket\n\
1.21 ericj 1547: \t-u UDP mode\n\
1.98 guenther 1548: \t-V rtable Specify alternate routing table\n\
1.21 ericj 1549: \t-v Verbose\n\
1.135 jmc 1550: \t-w timeout Timeout for connects and final net reads\n\
1.75 djm 1551: \t-X proto Proxy protocol: \"4\", \"5\" (SOCKS) or \"connect\"\n\
1552: \t-x addr[:port]\tSpecify proxy address and port\n\
1.21 ericj 1553: \t-z Zero-I/O mode [used for scanning]\n\
1554: Port numbers can be individual or ranges: lo-hi [inclusive]\n");
1555: exit(1);
1.11 ericj 1556: }
1557:
1558: void
1.37 jakob 1559: usage(int ret)
1.11 ericj 1560: {
1.92 sobrado 1561: fprintf(stderr,
1.135 jmc 1562: "usage: nc [-46cDdFhklNnrStUuvz] [-C certfile] [-e name] "
1563: "[-H hash] [-I length]\n"
1564: "\t [-i interval] [-K keyfile] [-O length] [-P proxy_username]\n"
1565: "\t [-p source_port] [-R CAfile] [-s source] "
1566: "[-T keyword] [-V rtable]\n"
1567: "\t [-w timeout] [-X proxy_protocol] [-x proxy_address[:port]]\n"
1.133 beck 1568: "\t [destination] [port]\n");
1.21 ericj 1569: if (ret)
1570: exit(1);
1.7 deraadt 1571: }
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