Annotation of src/usr.bin/nc/netcat.c, Revision 1.152
1.152 ! beck 1: /* $OpenBSD: netcat.c,v 1.151 2016/05/28 19:39:16 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>
1.113 djm 37: #include <sys/uio.h>
1.42 ericj 38: #include <sys/un.h>
1.21 ericj 39:
1.7 deraadt 40: #include <netinet/in.h>
1.65 markus 41: #include <netinet/tcp.h>
1.83 dtucker 42: #include <netinet/ip.h>
1.21 ericj 43: #include <arpa/telnet.h>
1.29 smart 44:
1.11 ericj 45: #include <err.h>
1.7 deraadt 46: #include <errno.h>
1.129 tobias 47: #include <limits.h>
1.21 ericj 48: #include <netdb.h>
49: #include <poll.h>
1.129 tobias 50: #include <signal.h>
1.13 ericj 51: #include <stdarg.h>
1.21 ericj 52: #include <stdio.h>
1.1 deraadt 53: #include <stdlib.h>
1.21 ericj 54: #include <string.h>
1.149 bcook 55: #include <time.h>
1.5 art 56: #include <unistd.h>
1.133 beck 57: #include <tls.h>
1.79 avsm 58: #include "atomicio.h"
1.51 vincent 59:
1.55 fgsch 60: #define PORT_MAX 65535
1.99 jeremy 61: #define UNIX_DG_TMP_SOCKET_SIZE 19
1.31 ericj 62:
1.125 tedu 63: #define POLL_STDIN 0
64: #define POLL_NETOUT 1
65: #define POLL_NETIN 2
66: #define POLL_STDOUT 3
1.126 tedu 67: #define BUFSIZE 16384
1.133 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 *);
1.151 beck 136: void report_connect(const struct sockaddr *, socklen_t, char *);
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) {
1.152 ! beck 326: if (Pflag) {
! 327: if (pledge("stdio inet dns sendfd tty", NULL) == -1)
! 328: err(1, "pledge");
! 329: } else if (pledge("stdio inet dns sendfd", NULL) == -1)
! 330: err(1, "pledge");
! 331: } else if (Pflag) {
! 332: if (pledge("stdio inet dns tty", NULL) == -1)
1.140 beck 333: err(1, "pledge");
1.143 deraadt 334: } else if (usetls) {
1.140 beck 335: if (pledge("stdio rpath inet dns", NULL) == -1)
336: err(1, "pledge");
1.143 deraadt 337: } else if (pledge("stdio inet dns", NULL) == -1)
1.140 beck 338: err(1, "pledge");
339:
1.21 ericj 340: /* Cruft to make sure options are clean, and used properly. */
1.42 ericj 341: if (argv[0] && !argv[1] && family == AF_UNIX) {
342: host = argv[0];
343: uport = NULL;
344: } else if (argv[0] && !argv[1]) {
1.21 ericj 345: if (!lflag)
346: usage(1);
347: uport = argv[0];
348: host = NULL;
349: } else if (argv[0] && argv[1]) {
350: host = argv[0];
351: uport = argv[1];
352: } else
353: usage(1);
1.1 deraadt 354:
1.21 ericj 355: if (lflag && sflag)
356: errx(1, "cannot use -s and -l");
357: if (lflag && pflag)
358: errx(1, "cannot use -p and -l");
359: if (lflag && zflag)
1.32 ericj 360: errx(1, "cannot use -z and -l");
1.21 ericj 361: if (!lflag && kflag)
1.32 ericj 362: errx(1, "must use -l with -k");
1.133 beck 363: if (uflag && usetls)
364: errx(1, "cannot use -c and -u");
365: if ((family == AF_UNIX) && usetls)
366: errx(1, "cannot use -c and -U");
1.140 beck 367: if ((family == AF_UNIX) && Fflag)
368: errx(1, "cannot use -F and -U");
369: if (Fflag && usetls)
370: errx(1, "cannot use -c and -F");
1.133 beck 371: if (TLSopt && !usetls)
372: errx(1, "you must specify -c to use TLS options");
373: if (Cflag && !usetls)
374: errx(1, "you must specify -c to use -C");
375: if (Kflag && !usetls)
376: errx(1, "you must specify -c to use -K");
377: if (tls_cachanged && !usetls)
378: errx(1, "you must specify -c to use -R");
379: if (tls_expecthash && !usetls)
380: errx(1, "you must specify -c to use -H");
381: if (tls_expectname && !usetls)
382: errx(1, "you must specify -c to use -e");
1.21 ericj 383:
1.99 jeremy 384: /* Get name of temporary socket for unix datagram client */
385: if ((family == AF_UNIX) && uflag && !lflag) {
386: if (sflag) {
387: unix_dg_tmp_socket = sflag;
388: } else {
389: strlcpy(unix_dg_tmp_socket_buf, "/tmp/nc.XXXXXXXXXX",
1.136 deraadt 390: UNIX_DG_TMP_SOCKET_SIZE);
1.99 jeremy 391: if (mktemp(unix_dg_tmp_socket_buf) == NULL)
392: err(1, "mktemp");
393: unix_dg_tmp_socket = unix_dg_tmp_socket_buf;
394: }
395: }
396:
1.67 jmc 397: /* Initialize addrinfo structure. */
1.42 ericj 398: if (family != AF_UNIX) {
399: memset(&hints, 0, sizeof(struct addrinfo));
400: hints.ai_family = family;
401: hints.ai_socktype = uflag ? SOCK_DGRAM : SOCK_STREAM;
402: hints.ai_protocol = uflag ? IPPROTO_UDP : IPPROTO_TCP;
403: if (nflag)
404: hints.ai_flags |= AI_NUMERICHOST;
405: }
1.1 deraadt 406:
1.34 jakob 407: if (xflag) {
408: if (uflag)
409: errx(1, "no proxy support for UDP mode");
410:
411: if (lflag)
412: errx(1, "no proxy support for listen");
413:
1.42 ericj 414: if (family == AF_UNIX)
415: errx(1, "no proxy support for unix sockets");
416:
1.34 jakob 417: /* XXX IPv6 transport to proxy would probably work */
418: if (family == AF_INET6)
419: errx(1, "no proxy support for IPv6");
420:
421: if (sflag)
422: errx(1, "no proxy support for local source address");
423:
424: proxyhost = strsep(&proxy, ":");
425: proxyport = proxy;
426:
427: memset(&proxyhints, 0, sizeof(struct addrinfo));
428: proxyhints.ai_family = family;
429: proxyhints.ai_socktype = SOCK_STREAM;
430: proxyhints.ai_protocol = IPPROTO_TCP;
431: if (nflag)
432: proxyhints.ai_flags |= AI_NUMERICHOST;
433: }
434:
1.133 beck 435: if (usetls) {
1.150 bcook 436: if (Rflag && (cacert = tls_load_file(Rflag, &cacertlen, NULL)) == NULL)
1.146 beck 437: errx(1, "unable to load root CA file %s", Rflag);
1.150 bcook 438: if (Cflag && (pubcert = tls_load_file(Cflag, &pubcertlen, NULL)) == NULL)
1.146 beck 439: errx(1, "unable to load TLS certificate file %s", Cflag);
1.150 bcook 440: if (Kflag && (privkey = tls_load_file(Kflag, &privkeylen, NULL)) == NULL)
1.146 beck 441: errx(1, "unable to load TLS key file %s", Kflag);
442:
1.152 ! beck 443: if (Pflag) {
! 444: if (pledge("stdio inet dns tty", NULL) == -1)
! 445: err(1, "pledge");
! 446: } else if (pledge("stdio inet dns", NULL) == -1)
1.146 beck 447: err(1, "pledge");
448:
1.133 beck 449: if (tls_init() == -1)
450: errx(1, "unable to initialize TLS");
451: if ((tls_cfg = tls_config_new()) == NULL)
452: errx(1, "unable to allocate TLS config");
1.146 beck 453: if (Rflag && tls_config_set_ca_mem(tls_cfg, cacert, cacertlen) == -1)
454: errx(1, "unable to set root CA file %s", Rflag);
1.150 bcook 455: if (Cflag && tls_config_set_cert_mem(tls_cfg, pubcert, pubcertlen) == -1)
1.133 beck 456: errx(1, "unable to set TLS certificate file %s", Cflag);
1.146 beck 457: if (Kflag && tls_config_set_key_mem(tls_cfg, privkey, privkeylen) == -1)
1.133 beck 458: errx(1, "unable to set TLS key file %s", Kflag);
459: if (TLSopt & TLS_LEGACY) {
460: tls_config_set_protocols(tls_cfg, TLS_PROTOCOLS_ALL);
461: tls_config_set_ciphers(tls_cfg, "legacy");
462: }
463: if (!lflag && (TLSopt & TLS_CCERT))
464: errx(1, "clientcert is only valid with -l");
465: if (TLSopt & TLS_NONAME)
466: tls_config_insecure_noverifyname(tls_cfg);
467: if (TLSopt & TLS_NOVERIFY) {
468: if (tls_expecthash != NULL)
469: errx(1, "-H and -T noverify may not be used"
470: "together");
471: tls_config_insecure_noverifycert(tls_cfg);
472: }
473: }
1.21 ericj 474: if (lflag) {
1.133 beck 475: struct tls *tls_cctx = NULL;
1.21 ericj 476: int connfd;
1.27 ericj 477: ret = 0;
1.1 deraadt 478:
1.99 jeremy 479: if (family == AF_UNIX) {
480: if (uflag)
1.136 deraadt 481: s = unix_bind(host, 0);
1.99 jeremy 482: else
483: s = unix_listen(host);
484: }
1.42 ericj 485:
1.133 beck 486: if (usetls) {
487: tls_config_verify_client_optional(tls_cfg);
488: if ((tls_ctx = tls_server()) == NULL)
489: errx(1, "tls server creation failed");
490: if (tls_configure(tls_ctx, tls_cfg) == -1)
491: errx(1, "tls configuration failed (%s)",
492: tls_error(tls_ctx));
493: }
1.67 jmc 494: /* Allow only one connection at a time, but stay alive. */
1.21 ericj 495: for (;;) {
1.42 ericj 496: if (family != AF_UNIX)
497: s = local_listen(host, uport, hints);
498: if (s < 0)
1.30 smart 499: err(1, NULL);
1.21 ericj 500: /*
1.109 haesbaer 501: * For UDP and -k, don't connect the socket, let it
502: * receive datagrams from multiple socket pairs.
1.21 ericj 503: */
1.109 haesbaer 504: if (uflag && kflag)
1.133 beck 505: readwrite(s, NULL);
1.109 haesbaer 506: /*
507: * For UDP and not -k, we will use recvfrom() initially
508: * to wait for a caller, then use the regular functions
509: * to talk to the caller.
510: */
511: else if (uflag && !kflag) {
1.80 mcbride 512: int rv, plen;
1.97 nicm 513: char buf[16384];
1.21 ericj 514: struct sockaddr_storage z;
515:
516: len = sizeof(z);
1.106 dlg 517: plen = 2048;
1.80 mcbride 518: rv = recvfrom(s, buf, plen, MSG_PEEK,
1.37 jakob 519: (struct sockaddr *)&z, &len);
1.23 ericj 520: if (rv < 0)
1.57 stevesk 521: err(1, "recvfrom");
1.21 ericj 522:
1.37 jakob 523: rv = connect(s, (struct sockaddr *)&z, len);
1.23 ericj 524: if (rv < 0)
1.57 stevesk 525: err(1, "connect");
1.1 deraadt 526:
1.108 haesbaer 527: if (vflag)
1.151 beck 528: report_connect((struct sockaddr *)&z, len, NULL);
1.108 haesbaer 529:
1.133 beck 530: readwrite(s, NULL);
1.21 ericj 531: } else {
1.78 otto 532: len = sizeof(cliaddr);
1.132 bluhm 533: connfd = accept4(s, (struct sockaddr *)&cliaddr,
534: &len, SOCK_NONBLOCK);
1.110 deraadt 535: if (connfd == -1) {
536: /* For now, all errnos are fatal */
1.125 tedu 537: err(1, "accept");
1.110 deraadt 538: }
1.108 haesbaer 539: if (vflag)
1.151 beck 540: report_connect((struct sockaddr *)&cliaddr, len,
541: family == AF_UNIX ? host : NULL);
1.133 beck 542: if ((usetls) &&
1.134 deraadt 543: (tls_cctx = tls_setup_server(tls_ctx, connfd, host)))
1.133 beck 544: readwrite(connfd, tls_cctx);
545: if (!usetls)
546: readwrite(connfd, NULL);
547: if (tls_cctx) {
548: int i;
1.136 deraadt 549:
1.133 beck 550: do {
551: i = tls_close(tls_cctx);
552: } while (i == TLS_WANT_POLLIN ||
553: i == TLS_WANT_POLLOUT);
554: tls_free(tls_cctx);
555: tls_cctx = NULL;
556: }
1.99 jeremy 557: close(connfd);
1.21 ericj 558: }
1.42 ericj 559: if (family != AF_UNIX)
560: close(s);
1.99 jeremy 561: else if (uflag) {
562: if (connect(s, NULL, 0) < 0)
563: err(1, "connect");
564: }
1.27 ericj 565:
1.21 ericj 566: if (!kflag)
567: break;
1.11 ericj 568: }
1.42 ericj 569: } else if (family == AF_UNIX) {
570: ret = 0;
571:
572: if ((s = unix_connect(host)) > 0 && !zflag) {
1.133 beck 573: readwrite(s, NULL);
1.42 ericj 574: close(s);
575: } else
576: ret = 1;
577:
1.99 jeremy 578: if (uflag)
579: unlink(unix_dg_tmp_socket);
1.42 ericj 580: exit(ret);
581:
1.21 ericj 582: } else {
583: int i = 0;
1.6 deraadt 584:
1.67 jmc 585: /* Construct the portlist[] array. */
1.21 ericj 586: build_ports(uport);
1.1 deraadt 587:
1.67 jmc 588: /* Cycle through portlist, connecting to each port. */
1.21 ericj 589: for (i = 0; portlist[i] != NULL; i++) {
590: if (s)
591: close(s);
1.34 jakob 592:
1.133 beck 593: if (usetls) {
594: if ((tls_ctx = tls_client()) == NULL)
595: errx(1, "tls client creation failed");
596: if (tls_configure(tls_ctx, tls_cfg) == -1)
597: errx(1, "tls configuration failed (%s)",
598: tls_error(tls_ctx));
599: }
1.34 jakob 600: if (xflag)
601: s = socks_connect(host, portlist[i], hints,
1.86 djm 602: proxyhost, proxyport, proxyhints, socksv,
603: Pflag);
1.34 jakob 604: else
605: s = remote_connect(host, portlist[i], hints);
606:
607: if (s < 0)
1.21 ericj 608: continue;
1.1 deraadt 609:
1.21 ericj 610: ret = 0;
611: if (vflag || zflag) {
1.67 jmc 612: /* For UDP, make sure we are connected. */
1.21 ericj 613: if (uflag) {
1.50 vincent 614: if (udptest(s) == -1) {
1.21 ericj 615: ret = 1;
616: continue;
617: }
618: }
1.1 deraadt 619:
1.67 jmc 620: /* Don't look up port if -n. */
1.21 ericj 621: if (nflag)
622: sv = NULL;
623: else {
624: sv = getservbyport(
1.37 jakob 625: ntohs(atoi(portlist[i])),
626: uflag ? "udp" : "tcp");
1.21 ericj 627: }
1.50 vincent 628:
1.94 mpf 629: fprintf(stderr,
630: "Connection to %s %s port [%s/%s] "
631: "succeeded!\n", host, portlist[i],
632: uflag ? "udp" : "tcp",
1.37 jakob 633: sv ? sv->s_name : "*");
1.21 ericj 634: }
1.113 djm 635: if (Fflag)
636: fdpass(s);
1.133 beck 637: else {
638: if (usetls)
639: tls_setup_client(tls_ctx, s, host);
640: if (!zflag)
641: readwrite(s, tls_ctx);
642: if (tls_ctx) {
643: int j;
1.136 deraadt 644:
1.133 beck 645: do {
646: j = tls_close(tls_ctx);
647: } while (j == TLS_WANT_POLLIN ||
648: j == TLS_WANT_POLLOUT);
649: tls_free(tls_ctx);
650: tls_ctx = NULL;
651: }
652: }
1.7 deraadt 653: }
1.11 ericj 654: }
1.1 deraadt 655:
1.21 ericj 656: if (s)
657: close(s);
658:
1.133 beck 659: tls_config_free(tls_cfg);
660:
1.21 ericj 661: exit(ret);
1.7 deraadt 662: }
1.1 deraadt 663:
1.11 ericj 664: /*
1.99 jeremy 665: * unix_bind()
666: * Returns a unix socket bound to the given path
1.42 ericj 667: */
668: int
1.136 deraadt 669: unix_bind(char *path, int flags)
1.42 ericj 670: {
1.144 bcook 671: struct sockaddr_un s_un;
1.42 ericj 672: int s;
673:
1.99 jeremy 674: /* Create unix domain socket. */
1.136 deraadt 675: if ((s = socket(AF_UNIX, flags | (uflag ? SOCK_DGRAM : SOCK_STREAM),
676: 0)) < 0)
1.50 vincent 677: return (-1);
1.42 ericj 678:
1.144 bcook 679: memset(&s_un, 0, sizeof(struct sockaddr_un));
680: s_un.sun_family = AF_UNIX;
1.60 avsm 681:
1.144 bcook 682: if (strlcpy(s_un.sun_path, path, sizeof(s_un.sun_path)) >=
683: sizeof(s_un.sun_path)) {
1.60 avsm 684: close(s);
685: errno = ENAMETOOLONG;
686: return (-1);
687: }
1.99 jeremy 688:
1.144 bcook 689: if (bind(s, (struct sockaddr *)&s_un, sizeof(s_un)) < 0) {
1.50 vincent 690: close(s);
691: return (-1);
1.42 ericj 692: }
693: return (s);
694: }
695:
1.133 beck 696: void
697: tls_setup_client(struct tls *tls_ctx, int s, char *host)
698: {
699: int i;
1.136 deraadt 700:
1.133 beck 701: if (tls_connect_socket(tls_ctx, s,
702: tls_expectname ? tls_expectname : host) == -1) {
703: errx(1, "tls connection failed (%s)",
704: tls_error(tls_ctx));
705: }
706: do {
707: if ((i = tls_handshake(tls_ctx)) == -1)
708: errx(1, "tls handshake failed (%s)",
709: tls_error(tls_ctx));
710: } while (i == TLS_WANT_POLLIN || i == TLS_WANT_POLLOUT);
711: if (vflag)
712: report_tls(tls_ctx, host, tls_expectname);
1.137 beck 713: if (tls_expecthash && tls_peer_cert_hash(tls_ctx) &&
714: strcmp(tls_expecthash, tls_peer_cert_hash(tls_ctx)) != 0)
1.133 beck 715: errx(1, "peer certificate is not %s", tls_expecthash);
716: }
1.141 deraadt 717:
1.133 beck 718: struct tls *
719: tls_setup_server(struct tls *tls_ctx, int connfd, char *host)
720: {
721: struct tls *tls_cctx;
1.136 deraadt 722:
1.133 beck 723: if (tls_accept_socket(tls_ctx, &tls_cctx,
724: connfd) == -1) {
725: warnx("tls accept failed (%s)",
726: tls_error(tls_ctx));
727: tls_cctx = NULL;
728: } else {
729: int i;
1.136 deraadt 730:
1.133 beck 731: do {
732: if ((i = tls_handshake(tls_cctx)) == -1)
733: warnx("tls handshake failed (%s)",
734: tls_error(tls_cctx));
735: } while(i == TLS_WANT_POLLIN || i == TLS_WANT_POLLOUT);
736: }
737: if (tls_cctx) {
738: int gotcert = tls_peer_cert_provided(tls_cctx);
1.136 deraadt 739:
1.133 beck 740: if (vflag && gotcert)
741: report_tls(tls_cctx, host, tls_expectname);
742: if ((TLSopt & TLS_CCERT) && !gotcert)
743: warnx("No client certificate provided");
1.137 beck 744: else if (gotcert && tls_peer_cert_hash(tls_ctx) && tls_expecthash &&
745: strcmp(tls_expecthash, tls_peer_cert_hash(tls_ctx)) != 0)
1.133 beck 746: warnx("peer certificate is not %s", tls_expecthash);
747: else if (gotcert && tls_expectname &&
1.134 deraadt 748: (!tls_peer_cert_contains_name(tls_cctx, tls_expectname)))
1.133 beck 749: warnx("name (%s) not found in client cert",
750: tls_expectname);
751: else {
752: return tls_cctx;
753: }
754: }
755: return NULL;
756: }
1.141 deraadt 757:
1.42 ericj 758: /*
1.99 jeremy 759: * unix_connect()
760: * Returns a socket connected to a local unix socket. Returns -1 on failure.
1.42 ericj 761: */
762: int
1.99 jeremy 763: unix_connect(char *path)
1.42 ericj 764: {
1.144 bcook 765: struct sockaddr_un s_un;
1.42 ericj 766: int s;
767:
1.99 jeremy 768: if (uflag) {
1.136 deraadt 769: if ((s = unix_bind(unix_dg_tmp_socket, SOCK_CLOEXEC)) < 0)
1.99 jeremy 770: return (-1);
771: } else {
1.136 deraadt 772: if ((s = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0)) < 0)
1.99 jeremy 773: return (-1);
774: }
1.42 ericj 775:
1.144 bcook 776: memset(&s_un, 0, sizeof(struct sockaddr_un));
777: s_un.sun_family = AF_UNIX;
1.60 avsm 778:
1.144 bcook 779: if (strlcpy(s_un.sun_path, path, sizeof(s_un.sun_path)) >=
780: sizeof(s_un.sun_path)) {
1.60 avsm 781: close(s);
782: errno = ENAMETOOLONG;
783: return (-1);
784: }
1.144 bcook 785: if (connect(s, (struct sockaddr *)&s_un, sizeof(s_un)) < 0) {
1.42 ericj 786: close(s);
787: return (-1);
788: }
1.99 jeremy 789: return (s);
790:
791: }
792:
793: /*
794: * unix_listen()
795: * Create a unix domain socket, and listen on it.
796: */
797: int
798: unix_listen(char *path)
799: {
800: int s;
1.136 deraadt 801: if ((s = unix_bind(path, 0)) < 0)
1.99 jeremy 802: return (-1);
1.42 ericj 803:
804: if (listen(s, 5) < 0) {
805: close(s);
806: return (-1);
807: }
808: return (s);
809: }
810:
811: /*
1.21 ericj 812: * remote_connect()
1.67 jmc 813: * Returns a socket connected to a remote host. Properly binds to a local
814: * port or source address if needed. Returns -1 on failure.
1.11 ericj 815: */
1.21 ericj 816: int
1.77 otto 817: remote_connect(const char *host, const char *port, struct addrinfo hints)
1.21 ericj 818: {
819: struct addrinfo *res, *res0;
1.91 markus 820: int s, error, on = 1;
1.21 ericj 821:
822: if ((error = getaddrinfo(host, port, &hints, &res)))
1.56 stevesk 823: errx(1, "getaddrinfo: %s", gai_strerror(error));
1.21 ericj 824:
825: res0 = res;
826: do {
1.132 bluhm 827: if ((s = socket(res0->ai_family, res0->ai_socktype |
828: SOCK_NONBLOCK, res0->ai_protocol)) < 0)
1.21 ericj 829: continue;
830:
1.67 jmc 831: /* Bind to a local port or source address if specified. */
1.21 ericj 832: if (sflag || pflag) {
833: struct addrinfo ahints, *ares;
1.6 deraadt 834:
1.91 markus 835: /* try SO_BINDANY, but don't insist */
836: setsockopt(s, SOL_SOCKET, SO_BINDANY, &on, sizeof(on));
1.21 ericj 837: memset(&ahints, 0, sizeof(struct addrinfo));
838: ahints.ai_family = res0->ai_family;
839: ahints.ai_socktype = uflag ? SOCK_DGRAM : SOCK_STREAM;
840: ahints.ai_protocol = uflag ? IPPROTO_UDP : IPPROTO_TCP;
1.25 ericj 841: ahints.ai_flags = AI_PASSIVE;
1.38 jakob 842: if ((error = getaddrinfo(sflag, pflag, &ahints, &ares)))
1.56 stevesk 843: errx(1, "getaddrinfo: %s", gai_strerror(error));
1.21 ericj 844:
845: if (bind(s, (struct sockaddr *)ares->ai_addr,
1.62 millert 846: ares->ai_addrlen) < 0)
1.119 guenther 847: err(1, "bind failed");
1.21 ericj 848: freeaddrinfo(ares);
1.6 deraadt 849: }
1.81 marius 850:
1.127 jca 851: set_common_sockopts(s, res0->ai_family);
1.6 deraadt 852:
1.103 fgsch 853: if (timeout_connect(s, res0->ai_addr, res0->ai_addrlen) == 0)
1.6 deraadt 854: break;
1.143 deraadt 855: if (vflag)
1.71 mcbride 856: warn("connect to %s port %s (%s) failed", host, port,
857: uflag ? "udp" : "tcp");
1.34 jakob 858:
1.21 ericj 859: close(s);
860: s = -1;
861: } while ((res0 = res0->ai_next) != NULL);
862:
863: freeaddrinfo(res);
1.1 deraadt 864:
1.21 ericj 865: return (s);
1.103 fgsch 866: }
867:
868: int
869: timeout_connect(int s, const struct sockaddr *name, socklen_t namelen)
870: {
871: struct pollfd pfd;
872: socklen_t optlen;
1.132 bluhm 873: int optval;
1.103 fgsch 874: int ret;
875:
876: if ((ret = connect(s, name, namelen)) != 0 && errno == EINPROGRESS) {
877: pfd.fd = s;
878: pfd.events = POLLOUT;
879: if ((ret = poll(&pfd, 1, timeout)) == 1) {
880: optlen = sizeof(optval);
881: if ((ret = getsockopt(s, SOL_SOCKET, SO_ERROR,
882: &optval, &optlen)) == 0) {
883: errno = optval;
884: ret = optval == 0 ? 0 : -1;
885: }
886: } else if (ret == 0) {
887: errno = ETIMEDOUT;
888: ret = -1;
889: } else
890: err(1, "poll failed");
891: }
892:
893: return (ret);
1.7 deraadt 894: }
1.1 deraadt 895:
1.11 ericj 896: /*
1.21 ericj 897: * local_listen()
1.67 jmc 898: * Returns a socket listening on a local port, binds to specified source
899: * address. Returns -1 on failure.
1.11 ericj 900: */
1.21 ericj 901: int
1.37 jakob 902: local_listen(char *host, char *port, struct addrinfo hints)
1.21 ericj 903: {
904: struct addrinfo *res, *res0;
905: int s, ret, x = 1;
906: int error;
1.6 deraadt 907:
1.67 jmc 908: /* Allow nodename to be null. */
1.21 ericj 909: hints.ai_flags |= AI_PASSIVE;
1.7 deraadt 910:
1.21 ericj 911: /*
912: * In the case of binding to a wildcard address
913: * default to binding to an ipv4 address.
914: */
915: if (host == NULL && hints.ai_family == AF_UNSPEC)
916: hints.ai_family = AF_INET;
1.1 deraadt 917:
1.21 ericj 918: if ((error = getaddrinfo(host, port, &hints, &res)))
1.70 deraadt 919: errx(1, "getaddrinfo: %s", gai_strerror(error));
1.14 ericj 920:
1.21 ericj 921: res0 = res;
922: do {
923: if ((s = socket(res0->ai_family, res0->ai_socktype,
1.82 marius 924: res0->ai_protocol)) < 0)
1.21 ericj 925: continue;
1.93 claudio 926:
1.21 ericj 927: ret = setsockopt(s, SOL_SOCKET, SO_REUSEPORT, &x, sizeof(x));
928: if (ret == -1)
1.30 smart 929: err(1, NULL);
1.81 marius 930:
1.127 jca 931: set_common_sockopts(s, res0->ai_family);
1.1 deraadt 932:
1.21 ericj 933: if (bind(s, (struct sockaddr *)res0->ai_addr,
1.37 jakob 934: res0->ai_addrlen) == 0)
1.21 ericj 935: break;
1.1 deraadt 936:
1.21 ericj 937: close(s);
938: s = -1;
939: } while ((res0 = res0->ai_next) != NULL);
1.1 deraadt 940:
1.47 ericj 941: if (!uflag && s != -1) {
1.21 ericj 942: if (listen(s, 1) < 0)
1.57 stevesk 943: err(1, "listen");
1.12 ericj 944: }
1.1 deraadt 945:
1.21 ericj 946: freeaddrinfo(res);
1.1 deraadt 947:
1.21 ericj 948: return (s);
1.7 deraadt 949: }
950:
1.11 ericj 951: /*
1.21 ericj 952: * readwrite()
953: * Loop that polls on the network file descriptor and stdin.
1.11 ericj 954: */
1.21 ericj 955: void
1.133 beck 956: readwrite(int net_fd, struct tls *tls_ctx)
1.6 deraadt 957: {
1.125 tedu 958: struct pollfd pfd[4];
959: int stdin_fd = STDIN_FILENO;
960: int stdout_fd = STDOUT_FILENO;
961: unsigned char netinbuf[BUFSIZE];
962: size_t netinbufpos = 0;
963: unsigned char stdinbuf[BUFSIZE];
964: size_t stdinbufpos = 0;
1.130 chl 965: int n, num_fds;
1.125 tedu 966: ssize_t ret;
967:
968: /* don't read from stdin if requested */
969: if (dflag)
970: stdin_fd = -1;
971:
972: /* stdin */
973: pfd[POLL_STDIN].fd = stdin_fd;
974: pfd[POLL_STDIN].events = POLLIN;
975:
976: /* network out */
977: pfd[POLL_NETOUT].fd = net_fd;
978: pfd[POLL_NETOUT].events = 0;
979:
980: /* network in */
981: pfd[POLL_NETIN].fd = net_fd;
982: pfd[POLL_NETIN].events = POLLIN;
983:
984: /* stdout */
985: pfd[POLL_STDOUT].fd = stdout_fd;
986: pfd[POLL_STDOUT].events = 0;
987:
988: while (1) {
989: /* both inputs are gone, buffers are empty, we are done */
1.134 deraadt 990: if (pfd[POLL_STDIN].fd == -1 && pfd[POLL_NETIN].fd == -1 &&
991: stdinbufpos == 0 && netinbufpos == 0) {
1.125 tedu 992: close(net_fd);
993: return;
994: }
995: /* both outputs are gone, we can't continue */
996: if (pfd[POLL_NETOUT].fd == -1 && pfd[POLL_STDOUT].fd == -1) {
997: close(net_fd);
998: return;
999: }
1000: /* listen and net in gone, queues empty, done */
1.134 deraadt 1001: if (lflag && pfd[POLL_NETIN].fd == -1 &&
1002: stdinbufpos == 0 && netinbufpos == 0) {
1.125 tedu 1003: close(net_fd);
1004: return;
1005: }
1.21 ericj 1006:
1.125 tedu 1007: /* help says -i is for "wait between lines sent". We read and
1008: * write arbitrary amounts of data, and we don't want to start
1009: * scanning for newlines, so this is as good as it gets */
1.21 ericj 1010: if (iflag)
1011: sleep(iflag);
1012:
1.125 tedu 1013: /* poll */
1014: num_fds = poll(pfd, 4, timeout);
1015:
1016: /* treat poll errors */
1017: if (num_fds == -1) {
1018: close(net_fd);
1019: err(1, "polling error");
1.21 ericj 1020: }
1.49 hugh 1021:
1.125 tedu 1022: /* timeout happened */
1023: if (num_fds == 0)
1.49 hugh 1024: return;
1.21 ericj 1025:
1.125 tedu 1026: /* treat socket error conditions */
1027: for (n = 0; n < 4; n++) {
1028: if (pfd[n].revents & (POLLERR|POLLNVAL)) {
1029: pfd[n].fd = -1;
1.6 deraadt 1030: }
1.21 ericj 1031: }
1.125 tedu 1032: /* reading is possible after HUP */
1033: if (pfd[POLL_STDIN].events & POLLIN &&
1034: pfd[POLL_STDIN].revents & POLLHUP &&
1.134 deraadt 1035: !(pfd[POLL_STDIN].revents & POLLIN))
1036: pfd[POLL_STDIN].fd = -1;
1.125 tedu 1037:
1038: if (pfd[POLL_NETIN].events & POLLIN &&
1039: pfd[POLL_NETIN].revents & POLLHUP &&
1.134 deraadt 1040: !(pfd[POLL_NETIN].revents & POLLIN))
1041: pfd[POLL_NETIN].fd = -1;
1.125 tedu 1042:
1043: if (pfd[POLL_NETOUT].revents & POLLHUP) {
1044: if (Nflag)
1045: shutdown(pfd[POLL_NETOUT].fd, SHUT_WR);
1046: pfd[POLL_NETOUT].fd = -1;
1047: }
1048: /* if HUP, stop watching stdout */
1049: if (pfd[POLL_STDOUT].revents & POLLHUP)
1050: pfd[POLL_STDOUT].fd = -1;
1051: /* if no net out, stop watching stdin */
1052: if (pfd[POLL_NETOUT].fd == -1)
1053: pfd[POLL_STDIN].fd = -1;
1054: /* if no stdout, stop watching net in */
1055: if (pfd[POLL_STDOUT].fd == -1) {
1056: if (pfd[POLL_NETIN].fd != -1)
1057: shutdown(pfd[POLL_NETIN].fd, SHUT_RD);
1058: pfd[POLL_NETIN].fd = -1;
1059: }
1.21 ericj 1060:
1.125 tedu 1061: /* try to read from stdin */
1062: if (pfd[POLL_STDIN].revents & POLLIN && stdinbufpos < BUFSIZE) {
1063: ret = fillbuf(pfd[POLL_STDIN].fd, stdinbuf,
1.133 beck 1064: &stdinbufpos, NULL);
1065: if (ret == TLS_WANT_POLLIN)
1066: pfd[POLL_STDIN].events = POLLIN;
1067: else if (ret == TLS_WANT_POLLOUT)
1068: pfd[POLL_STDIN].events = POLLOUT;
1069: else if (ret == 0 || ret == -1)
1.125 tedu 1070: pfd[POLL_STDIN].fd = -1;
1071: /* read something - poll net out */
1072: if (stdinbufpos > 0)
1073: pfd[POLL_NETOUT].events = POLLOUT;
1074: /* filled buffer - remove self from polling */
1075: if (stdinbufpos == BUFSIZE)
1076: pfd[POLL_STDIN].events = 0;
1077: }
1078: /* try to write to network */
1079: if (pfd[POLL_NETOUT].revents & POLLOUT && stdinbufpos > 0) {
1080: ret = drainbuf(pfd[POLL_NETOUT].fd, stdinbuf,
1.133 beck 1081: &stdinbufpos, tls_ctx);
1082: if (ret == TLS_WANT_POLLIN)
1083: pfd[POLL_NETOUT].events = POLLIN;
1084: else if (ret == TLS_WANT_POLLOUT)
1085: pfd[POLL_NETOUT].events = POLLOUT;
1086: else if (ret == -1)
1.125 tedu 1087: pfd[POLL_NETOUT].fd = -1;
1088: /* buffer empty - remove self from polling */
1089: if (stdinbufpos == 0)
1090: pfd[POLL_NETOUT].events = 0;
1091: /* buffer no longer full - poll stdin again */
1092: if (stdinbufpos < BUFSIZE)
1093: pfd[POLL_STDIN].events = POLLIN;
1094: }
1095: /* try to read from network */
1096: if (pfd[POLL_NETIN].revents & POLLIN && netinbufpos < BUFSIZE) {
1097: ret = fillbuf(pfd[POLL_NETIN].fd, netinbuf,
1.133 beck 1098: &netinbufpos, tls_ctx);
1099: if (ret == TLS_WANT_POLLIN)
1100: pfd[POLL_NETIN].events = POLLIN;
1101: else if (ret == TLS_WANT_POLLOUT)
1102: pfd[POLL_NETIN].events = POLLOUT;
1103: else if (ret == -1)
1.125 tedu 1104: pfd[POLL_NETIN].fd = -1;
1105: /* eof on net in - remove from pfd */
1106: if (ret == 0) {
1107: shutdown(pfd[POLL_NETIN].fd, SHUT_RD);
1108: pfd[POLL_NETIN].fd = -1;
1.50 vincent 1109: }
1.125 tedu 1110: /* read something - poll stdout */
1111: if (netinbufpos > 0)
1112: pfd[POLL_STDOUT].events = POLLOUT;
1113: /* filled buffer - remove self from polling */
1114: if (netinbufpos == BUFSIZE)
1115: pfd[POLL_NETIN].events = 0;
1116: /* handle telnet */
1117: if (tflag)
1118: atelnet(pfd[POLL_NETIN].fd, netinbuf,
1119: netinbufpos);
1120: }
1121: /* try to write to stdout */
1122: if (pfd[POLL_STDOUT].revents & POLLOUT && netinbufpos > 0) {
1123: ret = drainbuf(pfd[POLL_STDOUT].fd, netinbuf,
1.133 beck 1124: &netinbufpos, NULL);
1125: if (ret == TLS_WANT_POLLIN)
1126: pfd[POLL_STDOUT].events = POLLIN;
1127: else if (ret == TLS_WANT_POLLOUT)
1128: pfd[POLL_STDOUT].events = POLLOUT;
1129: else if (ret == -1)
1.125 tedu 1130: pfd[POLL_STDOUT].fd = -1;
1131: /* buffer empty - remove self from polling */
1132: if (netinbufpos == 0)
1133: pfd[POLL_STDOUT].events = 0;
1134: /* buffer no longer full - poll net in again */
1135: if (netinbufpos < BUFSIZE)
1136: pfd[POLL_NETIN].events = POLLIN;
1137: }
1138:
1139: /* stdin gone and queue empty? */
1140: if (pfd[POLL_STDIN].fd == -1 && stdinbufpos == 0) {
1141: if (pfd[POLL_NETOUT].fd != -1 && Nflag)
1142: shutdown(pfd[POLL_NETOUT].fd, SHUT_WR);
1143: pfd[POLL_NETOUT].fd = -1;
1144: }
1145: /* net in gone and queue empty? */
1146: if (pfd[POLL_NETIN].fd == -1 && netinbufpos == 0) {
1147: pfd[POLL_STDOUT].fd = -1;
1.21 ericj 1148: }
1.11 ericj 1149: }
1.125 tedu 1150: }
1151:
1152: ssize_t
1.133 beck 1153: drainbuf(int fd, unsigned char *buf, size_t *bufpos, struct tls *tls)
1.125 tedu 1154: {
1155: ssize_t n;
1156: ssize_t adjust;
1157:
1.133 beck 1158: if (tls)
1159: n = tls_write(tls, buf, *bufpos);
1160: else {
1161: n = write(fd, buf, *bufpos);
1162: /* don't treat EAGAIN, EINTR as error */
1163: if (n == -1 && (errno == EAGAIN || errno == EINTR))
1164: n = TLS_WANT_POLLOUT;
1165: }
1.125 tedu 1166: if (n <= 0)
1167: return n;
1168: /* adjust buffer */
1169: adjust = *bufpos - n;
1170: if (adjust > 0)
1171: memmove(buf, buf + n, adjust);
1172: *bufpos -= n;
1173: return n;
1174: }
1175:
1176: ssize_t
1.133 beck 1177: fillbuf(int fd, unsigned char *buf, size_t *bufpos, struct tls *tls)
1.125 tedu 1178: {
1179: size_t num = BUFSIZE - *bufpos;
1180: ssize_t n;
1181:
1.133 beck 1182: if (tls)
1183: n = tls_read(tls, buf + *bufpos, num);
1184: else {
1185: n = read(fd, buf + *bufpos, num);
1186: /* don't treat EAGAIN, EINTR as error */
1187: if (n == -1 && (errno == EAGAIN || errno == EINTR))
1188: n = TLS_WANT_POLLIN;
1189: }
1.125 tedu 1190: if (n <= 0)
1191: return n;
1192: *bufpos += n;
1193: return n;
1.113 djm 1194: }
1195:
1196: /*
1197: * fdpass()
1198: * Pass the connected file descriptor to stdout and exit.
1199: */
1200: void
1201: fdpass(int nfd)
1202: {
1203: struct msghdr mh;
1204: union {
1205: struct cmsghdr hdr;
1206: char buf[CMSG_SPACE(sizeof(int))];
1207: } cmsgbuf;
1208: struct cmsghdr *cmsg;
1209: struct iovec iov;
1210: char c = '\0';
1211: ssize_t r;
1212: struct pollfd pfd;
1213:
1214: /* Avoid obvious stupidity */
1215: if (isatty(STDOUT_FILENO))
1216: errx(1, "Cannot pass file descriptor to tty");
1217:
1218: bzero(&mh, sizeof(mh));
1219: bzero(&cmsgbuf, sizeof(cmsgbuf));
1220: bzero(&iov, sizeof(iov));
1221:
1222: mh.msg_control = (caddr_t)&cmsgbuf.buf;
1223: mh.msg_controllen = sizeof(cmsgbuf.buf);
1224: cmsg = CMSG_FIRSTHDR(&mh);
1225: cmsg->cmsg_len = CMSG_LEN(sizeof(int));
1226: cmsg->cmsg_level = SOL_SOCKET;
1227: cmsg->cmsg_type = SCM_RIGHTS;
1228: *(int *)CMSG_DATA(cmsg) = nfd;
1229:
1230: iov.iov_base = &c;
1231: iov.iov_len = 1;
1232: mh.msg_iov = &iov;
1233: mh.msg_iovlen = 1;
1234:
1235: bzero(&pfd, sizeof(pfd));
1236: pfd.fd = STDOUT_FILENO;
1.128 tobias 1237: pfd.events = POLLOUT;
1.113 djm 1238: for (;;) {
1239: r = sendmsg(STDOUT_FILENO, &mh, 0);
1240: if (r == -1) {
1241: if (errno == EAGAIN || errno == EINTR) {
1242: if (poll(&pfd, 1, -1) == -1)
1243: err(1, "poll");
1244: continue;
1245: }
1246: err(1, "sendmsg");
1.128 tobias 1247: } else if (r != 1)
1.113 djm 1248: errx(1, "sendmsg: unexpected return value %zd", r);
1249: else
1250: break;
1251: }
1252: exit(0);
1.7 deraadt 1253: }
1.50 vincent 1254:
1.67 jmc 1255: /* Deal with RFC 854 WILL/WONT DO/DONT negotiation. */
1.21 ericj 1256: void
1.37 jakob 1257: atelnet(int nfd, unsigned char *buf, unsigned int size)
1.6 deraadt 1258: {
1.24 ericj 1259: unsigned char *p, *end;
1260: unsigned char obuf[4];
1261:
1.95 nicm 1262: if (size < 3)
1263: return;
1264: end = buf + size - 2;
1.24 ericj 1265:
1266: for (p = buf; p < end; p++) {
1.21 ericj 1267: if (*p != IAC)
1.95 nicm 1268: continue;
1.24 ericj 1269:
1.25 ericj 1270: obuf[0] = IAC;
1.24 ericj 1271: p++;
1.50 vincent 1272: if ((*p == WILL) || (*p == WONT))
1.24 ericj 1273: obuf[1] = DONT;
1.95 nicm 1274: else if ((*p == DO) || (*p == DONT))
1.24 ericj 1275: obuf[1] = WONT;
1.95 nicm 1276: else
1277: continue;
1278:
1279: p++;
1280: obuf[2] = *p;
1281: if (atomicio(vwrite, nfd, obuf, 3) != 3)
1282: warn("Write Error!");
1.11 ericj 1283: }
1.7 deraadt 1284: }
1285:
1.11 ericj 1286: /*
1.21 ericj 1287: * build_ports()
1.105 lum 1288: * Build an array of ports in portlist[], listing each port
1.67 jmc 1289: * that we should try to connect to.
1.11 ericj 1290: */
1.21 ericj 1291: void
1.37 jakob 1292: build_ports(char *p)
1.6 deraadt 1293: {
1.88 ray 1294: const char *errstr;
1295: char *n;
1.21 ericj 1296: int hi, lo, cp;
1297: int x = 0;
1298:
1299: if ((n = strchr(p, '-')) != NULL) {
1300: *n = '\0';
1301: n++;
1302:
1.67 jmc 1303: /* Make sure the ports are in order: lowest->highest. */
1.88 ray 1304: hi = strtonum(n, 1, PORT_MAX, &errstr);
1305: if (errstr)
1306: errx(1, "port number %s: %s", errstr, n);
1307: lo = strtonum(p, 1, PORT_MAX, &errstr);
1308: if (errstr)
1309: errx(1, "port number %s: %s", errstr, p);
1.21 ericj 1310:
1311: if (lo > hi) {
1312: cp = hi;
1313: hi = lo;
1314: lo = cp;
1315: }
1316:
1.145 tb 1317: /*
1318: * Initialize portlist with a random permutation. Based on
1319: * Knuth, as in ip_randomid() in sys/netinet/ip_id.c.
1320: */
1.21 ericj 1321: if (rflag) {
1.145 tb 1322: for (x = 0; x <= hi - lo; x++) {
1323: cp = arc4random_uniform(x + 1);
1324: portlist[x] = portlist[cp];
1325: if (asprintf(&portlist[cp], "%d", x + lo) < 0)
1326: err(1, "asprintf");
1327: }
1328: } else { /* Load ports sequentially. */
1329: for (cp = lo; cp <= hi; cp++) {
1330: if (asprintf(&portlist[x], "%d", cp) < 0)
1331: err(1, "asprintf");
1332: x++;
1.6 deraadt 1333: }
1.11 ericj 1334: }
1.21 ericj 1335: } else {
1.88 ray 1336: hi = strtonum(p, 1, PORT_MAX, &errstr);
1337: if (errstr)
1338: errx(1, "port number %s: %s", errstr, p);
1.96 nicm 1339: portlist[0] = strdup(p);
1.55 fgsch 1340: if (portlist[0] == NULL)
1341: err(1, NULL);
1.11 ericj 1342: }
1.13 ericj 1343: }
1344:
1345: /*
1.21 ericj 1346: * udptest()
1347: * Do a few writes to see if the UDP port is there.
1.105 lum 1348: * Fails once PF state table is full.
1.13 ericj 1349: */
1.21 ericj 1350: int
1.37 jakob 1351: udptest(int s)
1.13 ericj 1352: {
1.74 deraadt 1353: int i, ret;
1.13 ericj 1354:
1.52 vincent 1355: for (i = 0; i <= 3; i++) {
1.74 deraadt 1356: if (write(s, "X", 1) == 1)
1.21 ericj 1357: ret = 1;
1.14 ericj 1358: else
1.21 ericj 1359: ret = -1;
1.14 ericj 1360: }
1.21 ericj 1361: return (ret);
1.81 marius 1362: }
1363:
1.84 dtucker 1364: void
1.127 jca 1365: set_common_sockopts(int s, int af)
1.81 marius 1366: {
1367: int x = 1;
1368:
1369: if (Sflag) {
1370: if (setsockopt(s, IPPROTO_TCP, TCP_MD5SIG,
1371: &x, sizeof(x)) == -1)
1372: err(1, NULL);
1373: }
1374: if (Dflag) {
1375: if (setsockopt(s, SOL_SOCKET, SO_DEBUG,
1376: &x, sizeof(x)) == -1)
1377: err(1, NULL);
1378: }
1.83 dtucker 1379: if (Tflag != -1) {
1.127 jca 1380: int proto, option;
1381:
1382: if (af == AF_INET6) {
1383: proto = IPPROTO_IPV6;
1384: option = IPV6_TCLASS;
1385: } else {
1386: proto = IPPROTO_IP;
1387: option = IP_TOS;
1388: }
1389:
1390: if (setsockopt(s, proto, option, &Tflag, sizeof(Tflag)) == -1)
1.83 dtucker 1391: err(1, "set IP ToS");
1392: }
1.90 djm 1393: if (Iflag) {
1394: if (setsockopt(s, SOL_SOCKET, SO_RCVBUF,
1395: &Iflag, sizeof(Iflag)) == -1)
1396: err(1, "set TCP receive buffer size");
1397: }
1398: if (Oflag) {
1399: if (setsockopt(s, SOL_SOCKET, SO_SNDBUF,
1400: &Oflag, sizeof(Oflag)) == -1)
1401: err(1, "set TCP send buffer size");
1402: }
1.83 dtucker 1403: }
1404:
1405: int
1.102 haesbaer 1406: map_tos(char *s, int *val)
1.83 dtucker 1407: {
1.102 haesbaer 1408: /* DiffServ Codepoints and other TOS mappings */
1409: const struct toskeywords {
1410: const char *keyword;
1411: int val;
1412: } *t, toskeywords[] = {
1413: { "af11", IPTOS_DSCP_AF11 },
1414: { "af12", IPTOS_DSCP_AF12 },
1415: { "af13", IPTOS_DSCP_AF13 },
1416: { "af21", IPTOS_DSCP_AF21 },
1417: { "af22", IPTOS_DSCP_AF22 },
1418: { "af23", IPTOS_DSCP_AF23 },
1419: { "af31", IPTOS_DSCP_AF31 },
1420: { "af32", IPTOS_DSCP_AF32 },
1421: { "af33", IPTOS_DSCP_AF33 },
1422: { "af41", IPTOS_DSCP_AF41 },
1423: { "af42", IPTOS_DSCP_AF42 },
1424: { "af43", IPTOS_DSCP_AF43 },
1425: { "critical", IPTOS_PREC_CRITIC_ECP },
1426: { "cs0", IPTOS_DSCP_CS0 },
1427: { "cs1", IPTOS_DSCP_CS1 },
1428: { "cs2", IPTOS_DSCP_CS2 },
1429: { "cs3", IPTOS_DSCP_CS3 },
1430: { "cs4", IPTOS_DSCP_CS4 },
1431: { "cs5", IPTOS_DSCP_CS5 },
1432: { "cs6", IPTOS_DSCP_CS6 },
1433: { "cs7", IPTOS_DSCP_CS7 },
1434: { "ef", IPTOS_DSCP_EF },
1435: { "inetcontrol", IPTOS_PREC_INTERNETCONTROL },
1436: { "lowdelay", IPTOS_LOWDELAY },
1437: { "netcontrol", IPTOS_PREC_NETCONTROL },
1438: { "reliability", IPTOS_RELIABILITY },
1439: { "throughput", IPTOS_THROUGHPUT },
1.134 deraadt 1440: { NULL, -1 },
1.102 haesbaer 1441: };
1442:
1443: for (t = toskeywords; t->keyword != NULL; t++) {
1444: if (strcmp(s, t->keyword) == 0) {
1445: *val = t->val;
1446: return (1);
1447: }
1448: }
1.83 dtucker 1449:
1.102 haesbaer 1450: return (0);
1.108 haesbaer 1451: }
1452:
1.133 beck 1453: int
1454: map_tls(char *s, int *val)
1455: {
1456: const struct tlskeywords {
1457: const char *keyword;
1458: int val;
1459: } *t, tlskeywords[] = {
1460: { "tlslegacy", TLS_LEGACY },
1461: { "noverify", TLS_NOVERIFY },
1462: { "noname", TLS_NONAME },
1463: { "clientcert", TLS_CCERT},
1.134 deraadt 1464: { NULL, -1 },
1.133 beck 1465: };
1466:
1467: for (t = tlskeywords; t->keyword != NULL; t++) {
1468: if (strcmp(s, t->keyword) == 0) {
1469: *val |= t->val;
1470: return (1);
1471: }
1472: }
1473: return (0);
1474: }
1475:
1476: void
1477: report_tls(struct tls * tls_ctx, char * host, char *tls_expectname)
1478: {
1.147 beck 1479: time_t t;
1.138 beck 1480: fprintf(stderr, "TLS handshake negotiated %s/%s with host %s\n",
1481: tls_conn_version(tls_ctx), tls_conn_cipher(tls_ctx), host);
1.148 mmcc 1482: fprintf(stderr, "Peer name: %s\n",
1.133 beck 1483: tls_expectname ? tls_expectname : host);
1.137 beck 1484: if (tls_peer_cert_subject(tls_ctx))
1485: fprintf(stderr, "Subject: %s\n",
1486: tls_peer_cert_subject(tls_ctx));
1487: if (tls_peer_cert_issuer(tls_ctx))
1488: fprintf(stderr, "Issuer: %s\n",
1489: tls_peer_cert_issuer(tls_ctx));
1.147 beck 1490: if ((t = tls_peer_cert_notbefore(tls_ctx)) != -1)
1491: fprintf(stderr, "Valid From: %s", ctime(&t));
1492: if ((t = tls_peer_cert_notafter(tls_ctx)) != -1)
1493: fprintf(stderr, "Valid Until: %s", ctime(&t));
1.137 beck 1494: if (tls_peer_cert_hash(tls_ctx))
1495: fprintf(stderr, "Cert Hash: %s\n",
1496: tls_peer_cert_hash(tls_ctx));
1.133 beck 1497: }
1.147 beck 1498:
1.108 haesbaer 1499: void
1.151 beck 1500: report_connect(const struct sockaddr *sa, socklen_t salen, char *path)
1.108 haesbaer 1501: {
1502: char remote_host[NI_MAXHOST];
1503: char remote_port[NI_MAXSERV];
1504: int herr;
1505: int flags = NI_NUMERICSERV;
1.151 beck 1506:
1507: if (path != NULL) {
1508: fprintf(stderr, "Connection on %s received!\n", path);
1509: return;
1510: }
1.134 deraadt 1511:
1.108 haesbaer 1512: if (nflag)
1513: flags |= NI_NUMERICHOST;
1.134 deraadt 1514:
1.108 haesbaer 1515: if ((herr = getnameinfo(sa, salen,
1516: remote_host, sizeof(remote_host),
1517: remote_port, sizeof(remote_port),
1518: flags)) != 0) {
1519: if (herr == EAI_SYSTEM)
1520: err(1, "getnameinfo");
1521: else
1522: errx(1, "getnameinfo: %s", gai_strerror(herr));
1523: }
1.134 deraadt 1524:
1.108 haesbaer 1525: fprintf(stderr,
1526: "Connection from %s %s "
1527: "received!\n", remote_host, remote_port);
1.7 deraadt 1528: }
1.1 deraadt 1529:
1.11 ericj 1530: void
1.58 deraadt 1531: help(void)
1.1 deraadt 1532: {
1.21 ericj 1533: usage(0);
1534: fprintf(stderr, "\tCommand Summary:\n\
1535: \t-4 Use IPv4\n\
1536: \t-6 Use IPv6\n\
1.135 jmc 1537: \t-C certfile Public key file\n\
1538: \t-c Use TLS\n\
1.73 markus 1539: \t-D Enable the debug socket option\n\
1.69 tedu 1540: \t-d Detach from stdin\n\
1.135 jmc 1541: \t-e name\t Required name in peer certificate\n\
1.114 jmc 1542: \t-F Pass socket fd\n\
1.135 jmc 1543: \t-H hash\t Hash string of peer certificate\n\
1.21 ericj 1544: \t-h This help text\n\
1.90 djm 1545: \t-I length TCP receive buffer length\n\
1.135 jmc 1546: \t-i interval Delay interval for lines sent, ports scanned\n\
1547: \t-K keyfile Private key file\n\
1.21 ericj 1548: \t-k Keep inbound sockets open for multiple connects\n\
1549: \t-l Listen mode, for inbound connects\n\
1.111 sthen 1550: \t-N Shutdown the network socket after EOF on stdin\n\
1.22 jasoni 1551: \t-n Suppress name/port resolutions\n\
1.90 djm 1552: \t-O length TCP send buffer length\n\
1.86 djm 1553: \t-P proxyuser\tUsername for proxy authentication\n\
1.36 jakob 1554: \t-p port\t Specify local port for remote connects\n\
1.135 jmc 1555: \t-R CAfile CA bundle\n\
1.21 ericj 1556: \t-r Randomize remote ports\n\
1.67 jmc 1557: \t-S Enable the TCP MD5 signature option\n\
1.135 jmc 1558: \t-s source Local source address\n\
1559: \t-T keyword TOS value or TLS options\n\
1.21 ericj 1560: \t-t Answer TELNET negotiation\n\
1.67 jmc 1561: \t-U Use UNIX domain socket\n\
1.21 ericj 1562: \t-u UDP mode\n\
1.98 guenther 1563: \t-V rtable Specify alternate routing table\n\
1.21 ericj 1564: \t-v Verbose\n\
1.135 jmc 1565: \t-w timeout Timeout for connects and final net reads\n\
1.75 djm 1566: \t-X proto Proxy protocol: \"4\", \"5\" (SOCKS) or \"connect\"\n\
1567: \t-x addr[:port]\tSpecify proxy address and port\n\
1.21 ericj 1568: \t-z Zero-I/O mode [used for scanning]\n\
1569: Port numbers can be individual or ranges: lo-hi [inclusive]\n");
1570: exit(1);
1.11 ericj 1571: }
1572:
1573: void
1.37 jakob 1574: usage(int ret)
1.11 ericj 1575: {
1.92 sobrado 1576: fprintf(stderr,
1.135 jmc 1577: "usage: nc [-46cDdFhklNnrStUuvz] [-C certfile] [-e name] "
1578: "[-H hash] [-I length]\n"
1579: "\t [-i interval] [-K keyfile] [-O length] [-P proxy_username]\n"
1580: "\t [-p source_port] [-R CAfile] [-s source] "
1581: "[-T keyword] [-V rtable]\n"
1582: "\t [-w timeout] [-X proxy_protocol] [-x proxy_address[:port]]\n"
1.133 beck 1583: "\t [destination] [port]\n");
1.21 ericj 1584: if (ret)
1585: exit(1);
1.7 deraadt 1586: }
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