Annotation of src/usr.bin/nc/netcat.c, Revision 1.143
1.143 ! deraadt 1: /* $OpenBSD: netcat.c,v 1.142 2015/11/12 20:33:52 benno Exp $ */
1.21 ericj 2: /*
3: * Copyright (c) 2001 Eric Jackson <ericj@monkey.org>
1.133 beck 4: * Copyright (c) 2015 Bob Beck. All rights reserved.
1.7 deraadt 5: *
1.21 ericj 6: * Redistribution and use in source and binary forms, with or without
7: * modification, are permitted provided that the following conditions
8: * are met:
1.7 deraadt 9: *
1.21 ericj 10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: * 3. The name of the author may not be used to endorse or promote products
16: * derived from this software without specific prior written permission.
1.7 deraadt 17: *
1.21 ericj 18: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28: */
1.1 deraadt 29:
1.24 ericj 30: /*
31: * Re-written nc(1) for OpenBSD. Original implementation by
1.21 ericj 32: * *Hobbit* <hobbit@avian.org>.
33: */
1.1 deraadt 34:
1.7 deraadt 35: #include <sys/types.h>
1.21 ericj 36: #include <sys/socket.h>
1.7 deraadt 37: #include <sys/time.h>
1.113 djm 38: #include <sys/uio.h>
1.42 ericj 39: #include <sys/un.h>
1.21 ericj 40:
1.7 deraadt 41: #include <netinet/in.h>
1.65 markus 42: #include <netinet/tcp.h>
1.83 dtucker 43: #include <netinet/ip.h>
1.21 ericj 44: #include <arpa/telnet.h>
1.29 smart 45:
1.11 ericj 46: #include <err.h>
1.7 deraadt 47: #include <errno.h>
1.129 tobias 48: #include <limits.h>
1.21 ericj 49: #include <netdb.h>
50: #include <poll.h>
1.129 tobias 51: #include <signal.h>
1.13 ericj 52: #include <stdarg.h>
1.21 ericj 53: #include <stdio.h>
1.1 deraadt 54: #include <stdlib.h>
1.21 ericj 55: #include <string.h>
1.5 art 56: #include <unistd.h>
1.133 beck 57: #include <tls.h>
1.79 avsm 58: #include "atomicio.h"
1.51 vincent 59:
1.55 fgsch 60: #define PORT_MAX 65535
61: #define PORT_MAX_LEN 6
1.99 jeremy 62: #define UNIX_DG_TMP_SOCKET_SIZE 19
1.31 ericj 63:
1.125 tedu 64: #define POLL_STDIN 0
65: #define POLL_NETOUT 1
66: #define POLL_NETIN 2
67: #define POLL_STDOUT 3
1.126 tedu 68: #define BUFSIZE 16384
1.133 beck 69: #define DEFAULT_CA_FILE "/etc/ssl/cert.pem"
70:
71: #define TLS_LEGACY (1 << 1)
72: #define TLS_NOVERIFY (1 << 2)
73: #define TLS_NONAME (1 << 3)
74: #define TLS_CCERT (1 << 4)
1.125 tedu 75:
1.21 ericj 76: /* Command Line Options */
1.68 tedu 77: int dflag; /* detached, no stdin */
1.113 djm 78: int Fflag; /* fdpass sock to stdout */
1.88 ray 79: unsigned int iflag; /* Interval Flag */
1.21 ericj 80: int kflag; /* More than one connect */
81: int lflag; /* Bind to local port */
1.111 sthen 82: int Nflag; /* shutdown() network socket */
1.67 jmc 83: int nflag; /* Don't do name look up */
1.86 djm 84: char *Pflag; /* Proxy username */
1.21 ericj 85: char *pflag; /* Localport flag */
86: int rflag; /* Random ports flag */
87: char *sflag; /* Source Address */
88: int tflag; /* Telnet Emulation */
89: int uflag; /* UDP - Default to TCP */
90: int vflag; /* Verbosity */
1.34 jakob 91: int xflag; /* Socks proxy */
1.21 ericj 92: int zflag; /* Port Scan Flag */
1.73 markus 93: int Dflag; /* sodebug */
1.90 djm 94: int Iflag; /* TCP receive buffer size */
95: int Oflag; /* TCP send buffer size */
1.65 markus 96: int Sflag; /* TCP MD5 signature option */
1.83 dtucker 97: int Tflag = -1; /* IP Type of Service */
1.117 sthen 98: int rtableid = -1;
1.21 ericj 99:
1.133 beck 100: int usetls; /* use TLS */
101: char *Cflag; /* Public cert file */
102: char *Kflag; /* Private key file */
103: char *Rflag = DEFAULT_CA_FILE; /* Root CA file */
104: int tls_cachanged; /* Using non-default CA file */
105: int TLSopt; /* TLS options */
106: char *tls_expectname; /* required name in peer cert */
107: char *tls_expecthash; /* required hash of peer cert */
108:
1.49 hugh 109: int timeout = -1;
1.21 ericj 110: int family = AF_UNSPEC;
1.63 miod 111: char *portlist[PORT_MAX+1];
1.99 jeremy 112: char *unix_dg_tmp_socket;
1.21 ericj 113:
1.40 millert 114: void atelnet(int, unsigned char *, unsigned int);
115: void build_ports(char *);
116: void help(void);
117: int local_listen(char *, char *, struct addrinfo);
1.133 beck 118: void readwrite(int, struct tls *);
1.113 djm 119: void fdpass(int nfd) __attribute__((noreturn));
1.77 otto 120: int remote_connect(const char *, const char *, struct addrinfo);
1.103 fgsch 121: int timeout_connect(int, const struct sockaddr *, socklen_t);
1.86 djm 122: int socks_connect(const char *, const char *, struct addrinfo,
123: const char *, const char *, struct addrinfo, int, const char *);
1.40 millert 124: int udptest(int);
1.136 deraadt 125: int unix_bind(char *, int);
1.42 ericj 126: int unix_connect(char *);
127: int unix_listen(char *);
1.127 jca 128: void set_common_sockopts(int, int);
1.102 haesbaer 129: int map_tos(char *, int *);
1.133 beck 130: int map_tls(char *, int *);
1.108 haesbaer 131: void report_connect(const struct sockaddr *, socklen_t);
1.134 deraadt 132: void report_tls(struct tls *tls_ctx, char * host, char *tls_expectname);
1.40 millert 133: void usage(int);
1.133 beck 134: ssize_t drainbuf(int, unsigned char *, size_t *, struct tls *);
135: ssize_t fillbuf(int, unsigned char *, size_t *, struct tls *);
136: void tls_setup_client(struct tls *, int, char *);
1.134 deraadt 137: struct tls *tls_setup_server(struct tls *, int, char *);
1.1 deraadt 138:
1.21 ericj 139: int
1.37 jakob 140: main(int argc, char *argv[])
1.21 ericj 141: {
1.46 markus 142: int ch, s, ret, socksv;
1.88 ray 143: char *host, *uport;
1.21 ericj 144: struct addrinfo hints;
1.29 smart 145: struct servent *sv;
1.21 ericj 146: socklen_t len;
1.76 hshoexer 147: struct sockaddr_storage cliaddr;
1.34 jakob 148: char *proxy;
1.88 ray 149: const char *errstr, *proxyhost = "", *proxyport = NULL;
1.34 jakob 150: struct addrinfo proxyhints;
1.99 jeremy 151: char unix_dg_tmp_socket_buf[UNIX_DG_TMP_SOCKET_SIZE];
1.133 beck 152: struct tls_config *tls_cfg = NULL;
153: struct tls *tls_ctx = NULL;
1.11 ericj 154:
1.29 smart 155: ret = 1;
156: s = 0;
1.46 markus 157: socksv = 5;
1.29 smart 158: host = NULL;
159: uport = NULL;
160: sv = NULL;
1.129 tobias 161:
162: signal(SIGPIPE, SIG_IGN);
1.29 smart 163:
1.80 mcbride 164: while ((ch = getopt(argc, argv,
1.133 beck 165: "46C:cDde:FH:hI:i:K:klNnO:P:p:R:rSs:T:tUuV:vw:X:x:z")) != -1) {
1.21 ericj 166: switch (ch) {
167: case '4':
168: family = AF_INET;
169: break;
170: case '6':
171: family = AF_INET6;
172: break;
1.42 ericj 173: case 'U':
174: family = AF_UNIX;
175: break;
1.46 markus 176: case 'X':
1.75 djm 177: if (strcasecmp(optarg, "connect") == 0)
178: socksv = -1; /* HTTP proxy CONNECT */
179: else if (strcmp(optarg, "4") == 0)
180: socksv = 4; /* SOCKS v.4 */
181: else if (strcmp(optarg, "5") == 0)
182: socksv = 5; /* SOCKS v.5 */
183: else
184: errx(1, "unsupported proxy protocol");
1.46 markus 185: break;
1.133 beck 186: case 'C':
187: Cflag = optarg;
188: break;
189: case 'c':
190: usetls = 1;
191: break;
1.68 tedu 192: case 'd':
193: dflag = 1;
194: break;
1.133 beck 195: case 'e':
196: tls_expectname = optarg;
197: break;
1.113 djm 198: case 'F':
199: Fflag = 1;
200: break;
1.133 beck 201: case 'H':
202: tls_expecthash = optarg;
203: break;
1.21 ericj 204: case 'h':
205: help();
206: break;
207: case 'i':
1.88 ray 208: iflag = strtonum(optarg, 0, UINT_MAX, &errstr);
209: if (errstr)
210: errx(1, "interval %s: %s", errstr, optarg);
1.21 ericj 211: break;
1.133 beck 212: case 'K':
213: Kflag = optarg;
214: break;
1.21 ericj 215: case 'k':
216: kflag = 1;
217: break;
218: case 'l':
219: lflag = 1;
220: break;
1.111 sthen 221: case 'N':
222: Nflag = 1;
223: break;
1.21 ericj 224: case 'n':
225: nflag = 1;
226: break;
1.86 djm 227: case 'P':
228: Pflag = optarg;
229: break;
1.21 ericj 230: case 'p':
231: pflag = optarg;
232: break;
1.133 beck 233: case 'R':
234: tls_cachanged = 1;
235: Rflag = optarg;
236: break;
1.21 ericj 237: case 'r':
238: rflag = 1;
239: break;
240: case 's':
241: sflag = optarg;
242: break;
243: case 't':
244: tflag = 1;
245: break;
246: case 'u':
247: uflag = 1;
248: break;
1.93 claudio 249: case 'V':
1.117 sthen 250: rtableid = (int)strtonum(optarg, 0,
1.93 claudio 251: RT_TABLEID_MAX, &errstr);
252: if (errstr)
1.98 guenther 253: errx(1, "rtable %s: %s", errstr, optarg);
1.93 claudio 254: break;
1.21 ericj 255: case 'v':
256: vflag = 1;
257: break;
1.70 deraadt 258: case 'w':
1.88 ray 259: timeout = strtonum(optarg, 0, INT_MAX / 1000, &errstr);
260: if (errstr)
261: errx(1, "timeout %s: %s", errstr, optarg);
1.49 hugh 262: timeout *= 1000;
1.21 ericj 263: break;
1.34 jakob 264: case 'x':
265: xflag = 1;
1.64 deraadt 266: if ((proxy = strdup(optarg)) == NULL)
267: err(1, NULL);
1.34 jakob 268: break;
1.21 ericj 269: case 'z':
270: zflag = 1;
271: break;
1.73 markus 272: case 'D':
273: Dflag = 1;
274: break;
1.90 djm 275: case 'I':
276: Iflag = strtonum(optarg, 1, 65536 << 14, &errstr);
277: if (errstr != NULL)
278: errx(1, "TCP receive window %s: %s",
279: errstr, optarg);
280: break;
281: case 'O':
282: Oflag = strtonum(optarg, 1, 65536 << 14, &errstr);
283: if (errstr != NULL)
284: errx(1, "TCP send window %s: %s",
285: errstr, optarg);
286: break;
1.65 markus 287: case 'S':
288: Sflag = 1;
289: break;
1.83 dtucker 290: case 'T':
1.102 haesbaer 291: errstr = NULL;
292: errno = 0;
293: if (map_tos(optarg, &Tflag))
294: break;
1.133 beck 295: if (map_tls(optarg, &TLSopt))
296: break;
1.102 haesbaer 297: if (strlen(optarg) > 1 && optarg[0] == '0' &&
298: optarg[1] == 'x')
299: Tflag = (int)strtol(optarg, NULL, 16);
300: else
301: Tflag = (int)strtonum(optarg, 0, 255,
302: &errstr);
303: if (Tflag < 0 || Tflag > 255 || errstr || errno)
1.133 beck 304: errx(1, "illegal tos/tls value %s", optarg);
1.83 dtucker 305: break;
1.21 ericj 306: default:
307: usage(1);
308: }
309: }
310: argc -= optind;
311: argv += optind;
1.11 ericj 312:
1.143 ! deraadt 313: if (rtableid >= 0)
1.142 benno 314: if (setrtable(rtableid) == -1)
315: err(1, "setrtable");
1.143 ! deraadt 316:
1.142 benno 317: if (family == AF_UNIX) {
1.140 beck 318: if (pledge("stdio rpath wpath cpath tmppath unix", NULL) == -1)
319: err(1, "pledge");
1.143 ! deraadt 320: } else if (Fflag) {
1.140 beck 321: if (pledge("stdio inet dns sendfd", NULL) == -1)
322: err(1, "pledge");
1.143 ! deraadt 323: } else if (usetls) {
1.140 beck 324: if (pledge("stdio rpath inet dns", NULL) == -1)
325: err(1, "pledge");
1.143 ! deraadt 326: } else if (pledge("stdio inet dns", NULL) == -1)
1.140 beck 327: err(1, "pledge");
328:
1.21 ericj 329: /* Cruft to make sure options are clean, and used properly. */
1.42 ericj 330: if (argv[0] && !argv[1] && family == AF_UNIX) {
331: host = argv[0];
332: uport = NULL;
333: } else if (argv[0] && !argv[1]) {
1.21 ericj 334: if (!lflag)
335: usage(1);
336: uport = argv[0];
337: host = NULL;
338: } else if (argv[0] && argv[1]) {
339: host = argv[0];
340: uport = argv[1];
341: } else
342: usage(1);
1.1 deraadt 343:
1.21 ericj 344: if (lflag && sflag)
345: errx(1, "cannot use -s and -l");
346: if (lflag && pflag)
347: errx(1, "cannot use -p and -l");
348: if (lflag && zflag)
1.32 ericj 349: errx(1, "cannot use -z and -l");
1.21 ericj 350: if (!lflag && kflag)
1.32 ericj 351: errx(1, "must use -l with -k");
1.133 beck 352: if (uflag && usetls)
353: errx(1, "cannot use -c and -u");
354: if ((family == AF_UNIX) && usetls)
355: errx(1, "cannot use -c and -U");
1.140 beck 356: if ((family == AF_UNIX) && Fflag)
357: errx(1, "cannot use -F and -U");
358: if (Fflag && usetls)
359: errx(1, "cannot use -c and -F");
1.133 beck 360: if (TLSopt && !usetls)
361: errx(1, "you must specify -c to use TLS options");
362: if (Cflag && !usetls)
363: errx(1, "you must specify -c to use -C");
364: if (Kflag && !usetls)
365: errx(1, "you must specify -c to use -K");
366: if (tls_cachanged && !usetls)
367: errx(1, "you must specify -c to use -R");
368: if (tls_expecthash && !usetls)
369: errx(1, "you must specify -c to use -H");
370: if (tls_expectname && !usetls)
371: errx(1, "you must specify -c to use -e");
1.21 ericj 372:
1.99 jeremy 373: /* Get name of temporary socket for unix datagram client */
374: if ((family == AF_UNIX) && uflag && !lflag) {
375: if (sflag) {
376: unix_dg_tmp_socket = sflag;
377: } else {
378: strlcpy(unix_dg_tmp_socket_buf, "/tmp/nc.XXXXXXXXXX",
1.136 deraadt 379: UNIX_DG_TMP_SOCKET_SIZE);
1.99 jeremy 380: if (mktemp(unix_dg_tmp_socket_buf) == NULL)
381: err(1, "mktemp");
382: unix_dg_tmp_socket = unix_dg_tmp_socket_buf;
383: }
384: }
385:
1.67 jmc 386: /* Initialize addrinfo structure. */
1.42 ericj 387: if (family != AF_UNIX) {
388: memset(&hints, 0, sizeof(struct addrinfo));
389: hints.ai_family = family;
390: hints.ai_socktype = uflag ? SOCK_DGRAM : SOCK_STREAM;
391: hints.ai_protocol = uflag ? IPPROTO_UDP : IPPROTO_TCP;
392: if (nflag)
393: hints.ai_flags |= AI_NUMERICHOST;
394: }
1.1 deraadt 395:
1.34 jakob 396: if (xflag) {
397: if (uflag)
398: errx(1, "no proxy support for UDP mode");
399:
400: if (lflag)
401: errx(1, "no proxy support for listen");
402:
1.42 ericj 403: if (family == AF_UNIX)
404: errx(1, "no proxy support for unix sockets");
405:
1.34 jakob 406: /* XXX IPv6 transport to proxy would probably work */
407: if (family == AF_INET6)
408: errx(1, "no proxy support for IPv6");
409:
410: if (sflag)
411: errx(1, "no proxy support for local source address");
412:
413: proxyhost = strsep(&proxy, ":");
414: proxyport = proxy;
415:
416: memset(&proxyhints, 0, sizeof(struct addrinfo));
417: proxyhints.ai_family = family;
418: proxyhints.ai_socktype = SOCK_STREAM;
419: proxyhints.ai_protocol = IPPROTO_TCP;
420: if (nflag)
421: proxyhints.ai_flags |= AI_NUMERICHOST;
422: }
423:
1.133 beck 424: if (usetls) {
425: if (tls_init() == -1)
426: errx(1, "unable to initialize TLS");
427: if ((tls_cfg = tls_config_new()) == NULL)
428: errx(1, "unable to allocate TLS config");
429: if (Cflag && (tls_config_set_cert_file(tls_cfg, Cflag) == -1))
430: errx(1, "unable to set TLS certificate file %s", Cflag);
431: if (Kflag && (tls_config_set_key_file(tls_cfg, Kflag) == -1))
432: errx(1, "unable to set TLS key file %s", Kflag);
433: if (Rflag && (tls_config_set_ca_file(tls_cfg, Rflag) == -1))
434: errx(1, "unable to set root CA file %s", Rflag);
435: if (TLSopt & TLS_LEGACY) {
436: tls_config_set_protocols(tls_cfg, TLS_PROTOCOLS_ALL);
437: tls_config_set_ciphers(tls_cfg, "legacy");
438: }
439: if (!lflag && (TLSopt & TLS_CCERT))
440: errx(1, "clientcert is only valid with -l");
441: if (TLSopt & TLS_NONAME)
442: tls_config_insecure_noverifyname(tls_cfg);
443: if (TLSopt & TLS_NOVERIFY) {
444: if (tls_expecthash != NULL)
445: errx(1, "-H and -T noverify may not be used"
446: "together");
447: tls_config_insecure_noverifycert(tls_cfg);
448: }
449: }
1.21 ericj 450: if (lflag) {
1.133 beck 451: struct tls *tls_cctx = NULL;
1.21 ericj 452: int connfd;
1.27 ericj 453: ret = 0;
1.1 deraadt 454:
1.99 jeremy 455: if (family == AF_UNIX) {
456: if (uflag)
1.136 deraadt 457: s = unix_bind(host, 0);
1.99 jeremy 458: else
459: s = unix_listen(host);
460: }
1.42 ericj 461:
1.133 beck 462: if (usetls) {
463: tls_config_verify_client_optional(tls_cfg);
464: if ((tls_ctx = tls_server()) == NULL)
465: errx(1, "tls server creation failed");
466: if (tls_configure(tls_ctx, tls_cfg) == -1)
467: errx(1, "tls configuration failed (%s)",
468: tls_error(tls_ctx));
469: }
1.67 jmc 470: /* Allow only one connection at a time, but stay alive. */
1.21 ericj 471: for (;;) {
1.42 ericj 472: if (family != AF_UNIX)
473: s = local_listen(host, uport, hints);
474: if (s < 0)
1.30 smart 475: err(1, NULL);
1.21 ericj 476: /*
1.109 haesbaer 477: * For UDP and -k, don't connect the socket, let it
478: * receive datagrams from multiple socket pairs.
1.21 ericj 479: */
1.109 haesbaer 480: if (uflag && kflag)
1.133 beck 481: readwrite(s, NULL);
1.109 haesbaer 482: /*
483: * For UDP and not -k, we will use recvfrom() initially
484: * to wait for a caller, then use the regular functions
485: * to talk to the caller.
486: */
487: else if (uflag && !kflag) {
1.80 mcbride 488: int rv, plen;
1.97 nicm 489: char buf[16384];
1.21 ericj 490: struct sockaddr_storage z;
491:
492: len = sizeof(z);
1.106 dlg 493: plen = 2048;
1.80 mcbride 494: rv = recvfrom(s, buf, plen, MSG_PEEK,
1.37 jakob 495: (struct sockaddr *)&z, &len);
1.23 ericj 496: if (rv < 0)
1.57 stevesk 497: err(1, "recvfrom");
1.21 ericj 498:
1.37 jakob 499: rv = connect(s, (struct sockaddr *)&z, len);
1.23 ericj 500: if (rv < 0)
1.57 stevesk 501: err(1, "connect");
1.1 deraadt 502:
1.108 haesbaer 503: if (vflag)
504: report_connect((struct sockaddr *)&z, len);
505:
1.133 beck 506: readwrite(s, NULL);
1.21 ericj 507: } else {
1.78 otto 508: len = sizeof(cliaddr);
1.132 bluhm 509: connfd = accept4(s, (struct sockaddr *)&cliaddr,
510: &len, SOCK_NONBLOCK);
1.110 deraadt 511: if (connfd == -1) {
512: /* For now, all errnos are fatal */
1.125 tedu 513: err(1, "accept");
1.110 deraadt 514: }
1.108 haesbaer 515: if (vflag)
516: report_connect((struct sockaddr *)&cliaddr, len);
1.133 beck 517: if ((usetls) &&
1.134 deraadt 518: (tls_cctx = tls_setup_server(tls_ctx, connfd, host)))
1.133 beck 519: readwrite(connfd, tls_cctx);
520: if (!usetls)
521: readwrite(connfd, NULL);
522: if (tls_cctx) {
523: int i;
1.136 deraadt 524:
1.133 beck 525: do {
526: i = tls_close(tls_cctx);
527: } while (i == TLS_WANT_POLLIN ||
528: i == TLS_WANT_POLLOUT);
529: tls_free(tls_cctx);
530: tls_cctx = NULL;
531: }
1.99 jeremy 532: close(connfd);
1.21 ericj 533: }
1.42 ericj 534: if (family != AF_UNIX)
535: close(s);
1.99 jeremy 536: else if (uflag) {
537: if (connect(s, NULL, 0) < 0)
538: err(1, "connect");
539: }
1.27 ericj 540:
1.21 ericj 541: if (!kflag)
542: break;
1.11 ericj 543: }
1.42 ericj 544: } else if (family == AF_UNIX) {
545: ret = 0;
546:
547: if ((s = unix_connect(host)) > 0 && !zflag) {
1.133 beck 548: readwrite(s, NULL);
1.42 ericj 549: close(s);
550: } else
551: ret = 1;
552:
1.99 jeremy 553: if (uflag)
554: unlink(unix_dg_tmp_socket);
1.42 ericj 555: exit(ret);
556:
1.21 ericj 557: } else {
558: int i = 0;
1.6 deraadt 559:
1.67 jmc 560: /* Construct the portlist[] array. */
1.21 ericj 561: build_ports(uport);
1.1 deraadt 562:
1.67 jmc 563: /* Cycle through portlist, connecting to each port. */
1.21 ericj 564: for (i = 0; portlist[i] != NULL; i++) {
565: if (s)
566: close(s);
1.34 jakob 567:
1.133 beck 568: if (usetls) {
569: if ((tls_ctx = tls_client()) == NULL)
570: errx(1, "tls client creation failed");
571: if (tls_configure(tls_ctx, tls_cfg) == -1)
572: errx(1, "tls configuration failed (%s)",
573: tls_error(tls_ctx));
574: }
1.34 jakob 575: if (xflag)
576: s = socks_connect(host, portlist[i], hints,
1.86 djm 577: proxyhost, proxyport, proxyhints, socksv,
578: Pflag);
1.34 jakob 579: else
580: s = remote_connect(host, portlist[i], hints);
581:
582: if (s < 0)
1.21 ericj 583: continue;
1.1 deraadt 584:
1.21 ericj 585: ret = 0;
586: if (vflag || zflag) {
1.67 jmc 587: /* For UDP, make sure we are connected. */
1.21 ericj 588: if (uflag) {
1.50 vincent 589: if (udptest(s) == -1) {
1.21 ericj 590: ret = 1;
591: continue;
592: }
593: }
1.1 deraadt 594:
1.67 jmc 595: /* Don't look up port if -n. */
1.21 ericj 596: if (nflag)
597: sv = NULL;
598: else {
599: sv = getservbyport(
1.37 jakob 600: ntohs(atoi(portlist[i])),
601: uflag ? "udp" : "tcp");
1.21 ericj 602: }
1.50 vincent 603:
1.94 mpf 604: fprintf(stderr,
605: "Connection to %s %s port [%s/%s] "
606: "succeeded!\n", host, portlist[i],
607: uflag ? "udp" : "tcp",
1.37 jakob 608: sv ? sv->s_name : "*");
1.21 ericj 609: }
1.113 djm 610: if (Fflag)
611: fdpass(s);
1.133 beck 612: else {
613: if (usetls)
614: tls_setup_client(tls_ctx, s, host);
615: if (!zflag)
616: readwrite(s, tls_ctx);
617: if (tls_ctx) {
618: int j;
1.136 deraadt 619:
1.133 beck 620: do {
621: j = tls_close(tls_ctx);
622: } while (j == TLS_WANT_POLLIN ||
623: j == TLS_WANT_POLLOUT);
624: tls_free(tls_ctx);
625: tls_ctx = NULL;
626: }
627: }
1.7 deraadt 628: }
1.11 ericj 629: }
1.1 deraadt 630:
1.21 ericj 631: if (s)
632: close(s);
633:
1.133 beck 634: tls_config_free(tls_cfg);
635:
1.21 ericj 636: exit(ret);
1.7 deraadt 637: }
1.1 deraadt 638:
1.11 ericj 639: /*
1.99 jeremy 640: * unix_bind()
641: * Returns a unix socket bound to the given path
1.42 ericj 642: */
643: int
1.136 deraadt 644: unix_bind(char *path, int flags)
1.42 ericj 645: {
646: struct sockaddr_un sun;
647: int s;
648:
1.99 jeremy 649: /* Create unix domain socket. */
1.136 deraadt 650: if ((s = socket(AF_UNIX, flags | (uflag ? SOCK_DGRAM : SOCK_STREAM),
651: 0)) < 0)
1.50 vincent 652: return (-1);
1.42 ericj 653:
654: memset(&sun, 0, sizeof(struct sockaddr_un));
655: sun.sun_family = AF_UNIX;
1.60 avsm 656:
657: if (strlcpy(sun.sun_path, path, sizeof(sun.sun_path)) >=
658: sizeof(sun.sun_path)) {
659: close(s);
660: errno = ENAMETOOLONG;
661: return (-1);
662: }
1.99 jeremy 663:
1.139 guenther 664: if (bind(s, (struct sockaddr *)&sun, sizeof(sun)) < 0) {
1.50 vincent 665: close(s);
666: return (-1);
1.42 ericj 667: }
668: return (s);
669: }
670:
1.133 beck 671: void
672: tls_setup_client(struct tls *tls_ctx, int s, char *host)
673: {
674: int i;
1.136 deraadt 675:
1.133 beck 676: if (tls_connect_socket(tls_ctx, s,
677: tls_expectname ? tls_expectname : host) == -1) {
678: errx(1, "tls connection failed (%s)",
679: tls_error(tls_ctx));
680: }
681: do {
682: if ((i = tls_handshake(tls_ctx)) == -1)
683: errx(1, "tls handshake failed (%s)",
684: tls_error(tls_ctx));
685: } while (i == TLS_WANT_POLLIN || i == TLS_WANT_POLLOUT);
686: if (vflag)
687: report_tls(tls_ctx, host, tls_expectname);
1.137 beck 688: if (tls_expecthash && tls_peer_cert_hash(tls_ctx) &&
689: strcmp(tls_expecthash, tls_peer_cert_hash(tls_ctx)) != 0)
1.133 beck 690: errx(1, "peer certificate is not %s", tls_expecthash);
691: }
1.141 deraadt 692:
1.133 beck 693: struct tls *
694: tls_setup_server(struct tls *tls_ctx, int connfd, char *host)
695: {
696: struct tls *tls_cctx;
1.136 deraadt 697:
1.133 beck 698: if (tls_accept_socket(tls_ctx, &tls_cctx,
699: connfd) == -1) {
700: warnx("tls accept failed (%s)",
701: tls_error(tls_ctx));
702: tls_cctx = NULL;
703: } else {
704: int i;
1.136 deraadt 705:
1.133 beck 706: do {
707: if ((i = tls_handshake(tls_cctx)) == -1)
708: warnx("tls handshake failed (%s)",
709: tls_error(tls_cctx));
710: } while(i == TLS_WANT_POLLIN || i == TLS_WANT_POLLOUT);
711: }
712: if (tls_cctx) {
713: int gotcert = tls_peer_cert_provided(tls_cctx);
1.136 deraadt 714:
1.133 beck 715: if (vflag && gotcert)
716: report_tls(tls_cctx, host, tls_expectname);
717: if ((TLSopt & TLS_CCERT) && !gotcert)
718: warnx("No client certificate provided");
1.137 beck 719: else if (gotcert && tls_peer_cert_hash(tls_ctx) && tls_expecthash &&
720: strcmp(tls_expecthash, tls_peer_cert_hash(tls_ctx)) != 0)
1.133 beck 721: warnx("peer certificate is not %s", tls_expecthash);
722: else if (gotcert && tls_expectname &&
1.134 deraadt 723: (!tls_peer_cert_contains_name(tls_cctx, tls_expectname)))
1.133 beck 724: warnx("name (%s) not found in client cert",
725: tls_expectname);
726: else {
727: return tls_cctx;
728: }
729: }
730: return NULL;
731: }
1.141 deraadt 732:
1.42 ericj 733: /*
1.99 jeremy 734: * unix_connect()
735: * Returns a socket connected to a local unix socket. Returns -1 on failure.
1.42 ericj 736: */
737: int
1.99 jeremy 738: unix_connect(char *path)
1.42 ericj 739: {
740: struct sockaddr_un sun;
741: int s;
742:
1.99 jeremy 743: if (uflag) {
1.136 deraadt 744: if ((s = unix_bind(unix_dg_tmp_socket, SOCK_CLOEXEC)) < 0)
1.99 jeremy 745: return (-1);
746: } else {
1.136 deraadt 747: if ((s = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0)) < 0)
1.99 jeremy 748: return (-1);
749: }
1.42 ericj 750:
1.60 avsm 751: memset(&sun, 0, sizeof(struct sockaddr_un));
1.42 ericj 752: sun.sun_family = AF_UNIX;
1.60 avsm 753:
754: if (strlcpy(sun.sun_path, path, sizeof(sun.sun_path)) >=
755: sizeof(sun.sun_path)) {
756: close(s);
757: errno = ENAMETOOLONG;
758: return (-1);
759: }
1.139 guenther 760: if (connect(s, (struct sockaddr *)&sun, sizeof(sun)) < 0) {
1.42 ericj 761: close(s);
762: return (-1);
763: }
1.99 jeremy 764: return (s);
765:
766: }
767:
768: /*
769: * unix_listen()
770: * Create a unix domain socket, and listen on it.
771: */
772: int
773: unix_listen(char *path)
774: {
775: int s;
1.136 deraadt 776: if ((s = unix_bind(path, 0)) < 0)
1.99 jeremy 777: return (-1);
1.42 ericj 778:
779: if (listen(s, 5) < 0) {
780: close(s);
781: return (-1);
782: }
783: return (s);
784: }
785:
786: /*
1.21 ericj 787: * remote_connect()
1.67 jmc 788: * Returns a socket connected to a remote host. Properly binds to a local
789: * port or source address if needed. Returns -1 on failure.
1.11 ericj 790: */
1.21 ericj 791: int
1.77 otto 792: remote_connect(const char *host, const char *port, struct addrinfo hints)
1.21 ericj 793: {
794: struct addrinfo *res, *res0;
1.91 markus 795: int s, error, on = 1;
1.21 ericj 796:
797: if ((error = getaddrinfo(host, port, &hints, &res)))
1.56 stevesk 798: errx(1, "getaddrinfo: %s", gai_strerror(error));
1.21 ericj 799:
800: res0 = res;
801: do {
1.132 bluhm 802: if ((s = socket(res0->ai_family, res0->ai_socktype |
803: SOCK_NONBLOCK, res0->ai_protocol)) < 0)
1.21 ericj 804: continue;
805:
1.67 jmc 806: /* Bind to a local port or source address if specified. */
1.21 ericj 807: if (sflag || pflag) {
808: struct addrinfo ahints, *ares;
1.6 deraadt 809:
1.91 markus 810: /* try SO_BINDANY, but don't insist */
811: setsockopt(s, SOL_SOCKET, SO_BINDANY, &on, sizeof(on));
1.21 ericj 812: memset(&ahints, 0, sizeof(struct addrinfo));
813: ahints.ai_family = res0->ai_family;
814: ahints.ai_socktype = uflag ? SOCK_DGRAM : SOCK_STREAM;
815: ahints.ai_protocol = uflag ? IPPROTO_UDP : IPPROTO_TCP;
1.25 ericj 816: ahints.ai_flags = AI_PASSIVE;
1.38 jakob 817: if ((error = getaddrinfo(sflag, pflag, &ahints, &ares)))
1.56 stevesk 818: errx(1, "getaddrinfo: %s", gai_strerror(error));
1.21 ericj 819:
820: if (bind(s, (struct sockaddr *)ares->ai_addr,
1.62 millert 821: ares->ai_addrlen) < 0)
1.119 guenther 822: err(1, "bind failed");
1.21 ericj 823: freeaddrinfo(ares);
1.6 deraadt 824: }
1.81 marius 825:
1.127 jca 826: set_common_sockopts(s, res0->ai_family);
1.6 deraadt 827:
1.103 fgsch 828: if (timeout_connect(s, res0->ai_addr, res0->ai_addrlen) == 0)
1.6 deraadt 829: break;
1.143 ! deraadt 830: if (vflag)
1.71 mcbride 831: warn("connect to %s port %s (%s) failed", host, port,
832: uflag ? "udp" : "tcp");
1.34 jakob 833:
1.21 ericj 834: close(s);
835: s = -1;
836: } while ((res0 = res0->ai_next) != NULL);
837:
838: freeaddrinfo(res);
1.1 deraadt 839:
1.21 ericj 840: return (s);
1.103 fgsch 841: }
842:
843: int
844: timeout_connect(int s, const struct sockaddr *name, socklen_t namelen)
845: {
846: struct pollfd pfd;
847: socklen_t optlen;
1.132 bluhm 848: int optval;
1.103 fgsch 849: int ret;
850:
851: if ((ret = connect(s, name, namelen)) != 0 && errno == EINPROGRESS) {
852: pfd.fd = s;
853: pfd.events = POLLOUT;
854: if ((ret = poll(&pfd, 1, timeout)) == 1) {
855: optlen = sizeof(optval);
856: if ((ret = getsockopt(s, SOL_SOCKET, SO_ERROR,
857: &optval, &optlen)) == 0) {
858: errno = optval;
859: ret = optval == 0 ? 0 : -1;
860: }
861: } else if (ret == 0) {
862: errno = ETIMEDOUT;
863: ret = -1;
864: } else
865: err(1, "poll failed");
866: }
867:
868: return (ret);
1.7 deraadt 869: }
1.1 deraadt 870:
1.11 ericj 871: /*
1.21 ericj 872: * local_listen()
1.67 jmc 873: * Returns a socket listening on a local port, binds to specified source
874: * address. Returns -1 on failure.
1.11 ericj 875: */
1.21 ericj 876: int
1.37 jakob 877: local_listen(char *host, char *port, struct addrinfo hints)
1.21 ericj 878: {
879: struct addrinfo *res, *res0;
880: int s, ret, x = 1;
881: int error;
1.6 deraadt 882:
1.67 jmc 883: /* Allow nodename to be null. */
1.21 ericj 884: hints.ai_flags |= AI_PASSIVE;
1.7 deraadt 885:
1.21 ericj 886: /*
887: * In the case of binding to a wildcard address
888: * default to binding to an ipv4 address.
889: */
890: if (host == NULL && hints.ai_family == AF_UNSPEC)
891: hints.ai_family = AF_INET;
1.1 deraadt 892:
1.21 ericj 893: if ((error = getaddrinfo(host, port, &hints, &res)))
1.70 deraadt 894: errx(1, "getaddrinfo: %s", gai_strerror(error));
1.14 ericj 895:
1.21 ericj 896: res0 = res;
897: do {
898: if ((s = socket(res0->ai_family, res0->ai_socktype,
1.82 marius 899: res0->ai_protocol)) < 0)
1.21 ericj 900: continue;
1.93 claudio 901:
1.21 ericj 902: ret = setsockopt(s, SOL_SOCKET, SO_REUSEPORT, &x, sizeof(x));
903: if (ret == -1)
1.30 smart 904: err(1, NULL);
1.81 marius 905:
1.127 jca 906: set_common_sockopts(s, res0->ai_family);
1.1 deraadt 907:
1.21 ericj 908: if (bind(s, (struct sockaddr *)res0->ai_addr,
1.37 jakob 909: res0->ai_addrlen) == 0)
1.21 ericj 910: break;
1.1 deraadt 911:
1.21 ericj 912: close(s);
913: s = -1;
914: } while ((res0 = res0->ai_next) != NULL);
1.1 deraadt 915:
1.47 ericj 916: if (!uflag && s != -1) {
1.21 ericj 917: if (listen(s, 1) < 0)
1.57 stevesk 918: err(1, "listen");
1.12 ericj 919: }
1.1 deraadt 920:
1.21 ericj 921: freeaddrinfo(res);
1.1 deraadt 922:
1.21 ericj 923: return (s);
1.7 deraadt 924: }
925:
1.11 ericj 926: /*
1.21 ericj 927: * readwrite()
928: * Loop that polls on the network file descriptor and stdin.
1.11 ericj 929: */
1.21 ericj 930: void
1.133 beck 931: readwrite(int net_fd, struct tls *tls_ctx)
1.6 deraadt 932: {
1.125 tedu 933: struct pollfd pfd[4];
934: int stdin_fd = STDIN_FILENO;
935: int stdout_fd = STDOUT_FILENO;
936: unsigned char netinbuf[BUFSIZE];
937: size_t netinbufpos = 0;
938: unsigned char stdinbuf[BUFSIZE];
939: size_t stdinbufpos = 0;
1.130 chl 940: int n, num_fds;
1.125 tedu 941: ssize_t ret;
942:
943: /* don't read from stdin if requested */
944: if (dflag)
945: stdin_fd = -1;
946:
947: /* stdin */
948: pfd[POLL_STDIN].fd = stdin_fd;
949: pfd[POLL_STDIN].events = POLLIN;
950:
951: /* network out */
952: pfd[POLL_NETOUT].fd = net_fd;
953: pfd[POLL_NETOUT].events = 0;
954:
955: /* network in */
956: pfd[POLL_NETIN].fd = net_fd;
957: pfd[POLL_NETIN].events = POLLIN;
958:
959: /* stdout */
960: pfd[POLL_STDOUT].fd = stdout_fd;
961: pfd[POLL_STDOUT].events = 0;
962:
963: while (1) {
964: /* both inputs are gone, buffers are empty, we are done */
1.134 deraadt 965: if (pfd[POLL_STDIN].fd == -1 && pfd[POLL_NETIN].fd == -1 &&
966: stdinbufpos == 0 && netinbufpos == 0) {
1.125 tedu 967: close(net_fd);
968: return;
969: }
970: /* both outputs are gone, we can't continue */
971: if (pfd[POLL_NETOUT].fd == -1 && pfd[POLL_STDOUT].fd == -1) {
972: close(net_fd);
973: return;
974: }
975: /* listen and net in gone, queues empty, done */
1.134 deraadt 976: if (lflag && pfd[POLL_NETIN].fd == -1 &&
977: stdinbufpos == 0 && netinbufpos == 0) {
1.125 tedu 978: close(net_fd);
979: return;
980: }
1.21 ericj 981:
1.125 tedu 982: /* help says -i is for "wait between lines sent". We read and
983: * write arbitrary amounts of data, and we don't want to start
984: * scanning for newlines, so this is as good as it gets */
1.21 ericj 985: if (iflag)
986: sleep(iflag);
987:
1.125 tedu 988: /* poll */
989: num_fds = poll(pfd, 4, timeout);
990:
991: /* treat poll errors */
992: if (num_fds == -1) {
993: close(net_fd);
994: err(1, "polling error");
1.21 ericj 995: }
1.49 hugh 996:
1.125 tedu 997: /* timeout happened */
998: if (num_fds == 0)
1.49 hugh 999: return;
1.21 ericj 1000:
1.125 tedu 1001: /* treat socket error conditions */
1002: for (n = 0; n < 4; n++) {
1003: if (pfd[n].revents & (POLLERR|POLLNVAL)) {
1004: pfd[n].fd = -1;
1.6 deraadt 1005: }
1.21 ericj 1006: }
1.125 tedu 1007: /* reading is possible after HUP */
1008: if (pfd[POLL_STDIN].events & POLLIN &&
1009: pfd[POLL_STDIN].revents & POLLHUP &&
1.134 deraadt 1010: !(pfd[POLL_STDIN].revents & POLLIN))
1011: pfd[POLL_STDIN].fd = -1;
1.125 tedu 1012:
1013: if (pfd[POLL_NETIN].events & POLLIN &&
1014: pfd[POLL_NETIN].revents & POLLHUP &&
1.134 deraadt 1015: !(pfd[POLL_NETIN].revents & POLLIN))
1016: pfd[POLL_NETIN].fd = -1;
1.125 tedu 1017:
1018: if (pfd[POLL_NETOUT].revents & POLLHUP) {
1019: if (Nflag)
1020: shutdown(pfd[POLL_NETOUT].fd, SHUT_WR);
1021: pfd[POLL_NETOUT].fd = -1;
1022: }
1023: /* if HUP, stop watching stdout */
1024: if (pfd[POLL_STDOUT].revents & POLLHUP)
1025: pfd[POLL_STDOUT].fd = -1;
1026: /* if no net out, stop watching stdin */
1027: if (pfd[POLL_NETOUT].fd == -1)
1028: pfd[POLL_STDIN].fd = -1;
1029: /* if no stdout, stop watching net in */
1030: if (pfd[POLL_STDOUT].fd == -1) {
1031: if (pfd[POLL_NETIN].fd != -1)
1032: shutdown(pfd[POLL_NETIN].fd, SHUT_RD);
1033: pfd[POLL_NETIN].fd = -1;
1034: }
1.21 ericj 1035:
1.125 tedu 1036: /* try to read from stdin */
1037: if (pfd[POLL_STDIN].revents & POLLIN && stdinbufpos < BUFSIZE) {
1038: ret = fillbuf(pfd[POLL_STDIN].fd, stdinbuf,
1.133 beck 1039: &stdinbufpos, NULL);
1040: if (ret == TLS_WANT_POLLIN)
1041: pfd[POLL_STDIN].events = POLLIN;
1042: else if (ret == TLS_WANT_POLLOUT)
1043: pfd[POLL_STDIN].events = POLLOUT;
1044: else if (ret == 0 || ret == -1)
1.125 tedu 1045: pfd[POLL_STDIN].fd = -1;
1046: /* read something - poll net out */
1047: if (stdinbufpos > 0)
1048: pfd[POLL_NETOUT].events = POLLOUT;
1049: /* filled buffer - remove self from polling */
1050: if (stdinbufpos == BUFSIZE)
1051: pfd[POLL_STDIN].events = 0;
1052: }
1053: /* try to write to network */
1054: if (pfd[POLL_NETOUT].revents & POLLOUT && stdinbufpos > 0) {
1055: ret = drainbuf(pfd[POLL_NETOUT].fd, stdinbuf,
1.133 beck 1056: &stdinbufpos, tls_ctx);
1057: if (ret == TLS_WANT_POLLIN)
1058: pfd[POLL_NETOUT].events = POLLIN;
1059: else if (ret == TLS_WANT_POLLOUT)
1060: pfd[POLL_NETOUT].events = POLLOUT;
1061: else if (ret == -1)
1.125 tedu 1062: pfd[POLL_NETOUT].fd = -1;
1063: /* buffer empty - remove self from polling */
1064: if (stdinbufpos == 0)
1065: pfd[POLL_NETOUT].events = 0;
1066: /* buffer no longer full - poll stdin again */
1067: if (stdinbufpos < BUFSIZE)
1068: pfd[POLL_STDIN].events = POLLIN;
1069: }
1070: /* try to read from network */
1071: if (pfd[POLL_NETIN].revents & POLLIN && netinbufpos < BUFSIZE) {
1072: ret = fillbuf(pfd[POLL_NETIN].fd, netinbuf,
1.133 beck 1073: &netinbufpos, tls_ctx);
1074: if (ret == TLS_WANT_POLLIN)
1075: pfd[POLL_NETIN].events = POLLIN;
1076: else if (ret == TLS_WANT_POLLOUT)
1077: pfd[POLL_NETIN].events = POLLOUT;
1078: else if (ret == -1)
1.125 tedu 1079: pfd[POLL_NETIN].fd = -1;
1080: /* eof on net in - remove from pfd */
1081: if (ret == 0) {
1082: shutdown(pfd[POLL_NETIN].fd, SHUT_RD);
1083: pfd[POLL_NETIN].fd = -1;
1.50 vincent 1084: }
1.125 tedu 1085: /* read something - poll stdout */
1086: if (netinbufpos > 0)
1087: pfd[POLL_STDOUT].events = POLLOUT;
1088: /* filled buffer - remove self from polling */
1089: if (netinbufpos == BUFSIZE)
1090: pfd[POLL_NETIN].events = 0;
1091: /* handle telnet */
1092: if (tflag)
1093: atelnet(pfd[POLL_NETIN].fd, netinbuf,
1094: netinbufpos);
1095: }
1096: /* try to write to stdout */
1097: if (pfd[POLL_STDOUT].revents & POLLOUT && netinbufpos > 0) {
1098: ret = drainbuf(pfd[POLL_STDOUT].fd, netinbuf,
1.133 beck 1099: &netinbufpos, NULL);
1100: if (ret == TLS_WANT_POLLIN)
1101: pfd[POLL_STDOUT].events = POLLIN;
1102: else if (ret == TLS_WANT_POLLOUT)
1103: pfd[POLL_STDOUT].events = POLLOUT;
1104: else if (ret == -1)
1.125 tedu 1105: pfd[POLL_STDOUT].fd = -1;
1106: /* buffer empty - remove self from polling */
1107: if (netinbufpos == 0)
1108: pfd[POLL_STDOUT].events = 0;
1109: /* buffer no longer full - poll net in again */
1110: if (netinbufpos < BUFSIZE)
1111: pfd[POLL_NETIN].events = POLLIN;
1112: }
1113:
1114: /* stdin gone and queue empty? */
1115: if (pfd[POLL_STDIN].fd == -1 && stdinbufpos == 0) {
1116: if (pfd[POLL_NETOUT].fd != -1 && Nflag)
1117: shutdown(pfd[POLL_NETOUT].fd, SHUT_WR);
1118: pfd[POLL_NETOUT].fd = -1;
1119: }
1120: /* net in gone and queue empty? */
1121: if (pfd[POLL_NETIN].fd == -1 && netinbufpos == 0) {
1122: pfd[POLL_STDOUT].fd = -1;
1.21 ericj 1123: }
1.11 ericj 1124: }
1.125 tedu 1125: }
1126:
1127: ssize_t
1.133 beck 1128: drainbuf(int fd, unsigned char *buf, size_t *bufpos, struct tls *tls)
1.125 tedu 1129: {
1130: ssize_t n;
1131: ssize_t adjust;
1132:
1.133 beck 1133: if (tls)
1134: n = tls_write(tls, buf, *bufpos);
1135: else {
1136: n = write(fd, buf, *bufpos);
1137: /* don't treat EAGAIN, EINTR as error */
1138: if (n == -1 && (errno == EAGAIN || errno == EINTR))
1139: n = TLS_WANT_POLLOUT;
1140: }
1.125 tedu 1141: if (n <= 0)
1142: return n;
1143: /* adjust buffer */
1144: adjust = *bufpos - n;
1145: if (adjust > 0)
1146: memmove(buf, buf + n, adjust);
1147: *bufpos -= n;
1148: return n;
1149: }
1150:
1151: ssize_t
1.133 beck 1152: fillbuf(int fd, unsigned char *buf, size_t *bufpos, struct tls *tls)
1.125 tedu 1153: {
1154: size_t num = BUFSIZE - *bufpos;
1155: ssize_t n;
1156:
1.133 beck 1157: if (tls)
1158: n = tls_read(tls, buf + *bufpos, num);
1159: else {
1160: n = read(fd, buf + *bufpos, num);
1161: /* don't treat EAGAIN, EINTR as error */
1162: if (n == -1 && (errno == EAGAIN || errno == EINTR))
1163: n = TLS_WANT_POLLIN;
1164: }
1.125 tedu 1165: if (n <= 0)
1166: return n;
1167: *bufpos += n;
1168: return n;
1.113 djm 1169: }
1170:
1171: /*
1172: * fdpass()
1173: * Pass the connected file descriptor to stdout and exit.
1174: */
1175: void
1176: fdpass(int nfd)
1177: {
1178: struct msghdr mh;
1179: union {
1180: struct cmsghdr hdr;
1181: char buf[CMSG_SPACE(sizeof(int))];
1182: } cmsgbuf;
1183: struct cmsghdr *cmsg;
1184: struct iovec iov;
1185: char c = '\0';
1186: ssize_t r;
1187: struct pollfd pfd;
1188:
1189: /* Avoid obvious stupidity */
1190: if (isatty(STDOUT_FILENO))
1191: errx(1, "Cannot pass file descriptor to tty");
1192:
1193: bzero(&mh, sizeof(mh));
1194: bzero(&cmsgbuf, sizeof(cmsgbuf));
1195: bzero(&iov, sizeof(iov));
1196:
1197: mh.msg_control = (caddr_t)&cmsgbuf.buf;
1198: mh.msg_controllen = sizeof(cmsgbuf.buf);
1199: cmsg = CMSG_FIRSTHDR(&mh);
1200: cmsg->cmsg_len = CMSG_LEN(sizeof(int));
1201: cmsg->cmsg_level = SOL_SOCKET;
1202: cmsg->cmsg_type = SCM_RIGHTS;
1203: *(int *)CMSG_DATA(cmsg) = nfd;
1204:
1205: iov.iov_base = &c;
1206: iov.iov_len = 1;
1207: mh.msg_iov = &iov;
1208: mh.msg_iovlen = 1;
1209:
1210: bzero(&pfd, sizeof(pfd));
1211: pfd.fd = STDOUT_FILENO;
1.128 tobias 1212: pfd.events = POLLOUT;
1.113 djm 1213: for (;;) {
1214: r = sendmsg(STDOUT_FILENO, &mh, 0);
1215: if (r == -1) {
1216: if (errno == EAGAIN || errno == EINTR) {
1217: if (poll(&pfd, 1, -1) == -1)
1218: err(1, "poll");
1219: continue;
1220: }
1221: err(1, "sendmsg");
1.128 tobias 1222: } else if (r != 1)
1.113 djm 1223: errx(1, "sendmsg: unexpected return value %zd", r);
1224: else
1225: break;
1226: }
1227: exit(0);
1.7 deraadt 1228: }
1.50 vincent 1229:
1.67 jmc 1230: /* Deal with RFC 854 WILL/WONT DO/DONT negotiation. */
1.21 ericj 1231: void
1.37 jakob 1232: atelnet(int nfd, unsigned char *buf, unsigned int size)
1.6 deraadt 1233: {
1.24 ericj 1234: unsigned char *p, *end;
1235: unsigned char obuf[4];
1236:
1.95 nicm 1237: if (size < 3)
1238: return;
1239: end = buf + size - 2;
1.24 ericj 1240:
1241: for (p = buf; p < end; p++) {
1.21 ericj 1242: if (*p != IAC)
1.95 nicm 1243: continue;
1.24 ericj 1244:
1.25 ericj 1245: obuf[0] = IAC;
1.24 ericj 1246: p++;
1.50 vincent 1247: if ((*p == WILL) || (*p == WONT))
1.24 ericj 1248: obuf[1] = DONT;
1.95 nicm 1249: else if ((*p == DO) || (*p == DONT))
1.24 ericj 1250: obuf[1] = WONT;
1.95 nicm 1251: else
1252: continue;
1253:
1254: p++;
1255: obuf[2] = *p;
1256: if (atomicio(vwrite, nfd, obuf, 3) != 3)
1257: warn("Write Error!");
1.11 ericj 1258: }
1.7 deraadt 1259: }
1260:
1.11 ericj 1261: /*
1.21 ericj 1262: * build_ports()
1.105 lum 1263: * Build an array of ports in portlist[], listing each port
1.67 jmc 1264: * that we should try to connect to.
1.11 ericj 1265: */
1.21 ericj 1266: void
1.37 jakob 1267: build_ports(char *p)
1.6 deraadt 1268: {
1.88 ray 1269: const char *errstr;
1270: char *n;
1.21 ericj 1271: int hi, lo, cp;
1272: int x = 0;
1273:
1274: if ((n = strchr(p, '-')) != NULL) {
1275: *n = '\0';
1276: n++;
1277:
1.67 jmc 1278: /* Make sure the ports are in order: lowest->highest. */
1.88 ray 1279: hi = strtonum(n, 1, PORT_MAX, &errstr);
1280: if (errstr)
1281: errx(1, "port number %s: %s", errstr, n);
1282: lo = strtonum(p, 1, PORT_MAX, &errstr);
1283: if (errstr)
1284: errx(1, "port number %s: %s", errstr, p);
1.21 ericj 1285:
1286: if (lo > hi) {
1287: cp = hi;
1288: hi = lo;
1289: lo = cp;
1290: }
1291:
1.67 jmc 1292: /* Load ports sequentially. */
1.21 ericj 1293: for (cp = lo; cp <= hi; cp++) {
1.55 fgsch 1294: portlist[x] = calloc(1, PORT_MAX_LEN);
1295: if (portlist[x] == NULL)
1296: err(1, NULL);
1297: snprintf(portlist[x], PORT_MAX_LEN, "%d", cp);
1.21 ericj 1298: x++;
1299: }
1300:
1.67 jmc 1301: /* Randomly swap ports. */
1.21 ericj 1302: if (rflag) {
1303: int y;
1304: char *c;
1305:
1306: for (x = 0; x <= (hi - lo); x++) {
1307: y = (arc4random() & 0xFFFF) % (hi - lo);
1308: c = portlist[x];
1309: portlist[x] = portlist[y];
1310: portlist[y] = c;
1.6 deraadt 1311: }
1.11 ericj 1312: }
1.21 ericj 1313: } else {
1.88 ray 1314: hi = strtonum(p, 1, PORT_MAX, &errstr);
1315: if (errstr)
1316: errx(1, "port number %s: %s", errstr, p);
1.96 nicm 1317: portlist[0] = strdup(p);
1.55 fgsch 1318: if (portlist[0] == NULL)
1319: err(1, NULL);
1.11 ericj 1320: }
1.13 ericj 1321: }
1322:
1323: /*
1.21 ericj 1324: * udptest()
1325: * Do a few writes to see if the UDP port is there.
1.105 lum 1326: * Fails once PF state table is full.
1.13 ericj 1327: */
1.21 ericj 1328: int
1.37 jakob 1329: udptest(int s)
1.13 ericj 1330: {
1.74 deraadt 1331: int i, ret;
1.13 ericj 1332:
1.52 vincent 1333: for (i = 0; i <= 3; i++) {
1.74 deraadt 1334: if (write(s, "X", 1) == 1)
1.21 ericj 1335: ret = 1;
1.14 ericj 1336: else
1.21 ericj 1337: ret = -1;
1.14 ericj 1338: }
1.21 ericj 1339: return (ret);
1.81 marius 1340: }
1341:
1.84 dtucker 1342: void
1.127 jca 1343: set_common_sockopts(int s, int af)
1.81 marius 1344: {
1345: int x = 1;
1346:
1347: if (Sflag) {
1348: if (setsockopt(s, IPPROTO_TCP, TCP_MD5SIG,
1349: &x, sizeof(x)) == -1)
1350: err(1, NULL);
1351: }
1352: if (Dflag) {
1353: if (setsockopt(s, SOL_SOCKET, SO_DEBUG,
1354: &x, sizeof(x)) == -1)
1355: err(1, NULL);
1356: }
1.83 dtucker 1357: if (Tflag != -1) {
1.127 jca 1358: int proto, option;
1359:
1360: if (af == AF_INET6) {
1361: proto = IPPROTO_IPV6;
1362: option = IPV6_TCLASS;
1363: } else {
1364: proto = IPPROTO_IP;
1365: option = IP_TOS;
1366: }
1367:
1368: if (setsockopt(s, proto, option, &Tflag, sizeof(Tflag)) == -1)
1.83 dtucker 1369: err(1, "set IP ToS");
1370: }
1.90 djm 1371: if (Iflag) {
1372: if (setsockopt(s, SOL_SOCKET, SO_RCVBUF,
1373: &Iflag, sizeof(Iflag)) == -1)
1374: err(1, "set TCP receive buffer size");
1375: }
1376: if (Oflag) {
1377: if (setsockopt(s, SOL_SOCKET, SO_SNDBUF,
1378: &Oflag, sizeof(Oflag)) == -1)
1379: err(1, "set TCP send buffer size");
1380: }
1.83 dtucker 1381: }
1382:
1383: int
1.102 haesbaer 1384: map_tos(char *s, int *val)
1.83 dtucker 1385: {
1.102 haesbaer 1386: /* DiffServ Codepoints and other TOS mappings */
1387: const struct toskeywords {
1388: const char *keyword;
1389: int val;
1390: } *t, toskeywords[] = {
1391: { "af11", IPTOS_DSCP_AF11 },
1392: { "af12", IPTOS_DSCP_AF12 },
1393: { "af13", IPTOS_DSCP_AF13 },
1394: { "af21", IPTOS_DSCP_AF21 },
1395: { "af22", IPTOS_DSCP_AF22 },
1396: { "af23", IPTOS_DSCP_AF23 },
1397: { "af31", IPTOS_DSCP_AF31 },
1398: { "af32", IPTOS_DSCP_AF32 },
1399: { "af33", IPTOS_DSCP_AF33 },
1400: { "af41", IPTOS_DSCP_AF41 },
1401: { "af42", IPTOS_DSCP_AF42 },
1402: { "af43", IPTOS_DSCP_AF43 },
1403: { "critical", IPTOS_PREC_CRITIC_ECP },
1404: { "cs0", IPTOS_DSCP_CS0 },
1405: { "cs1", IPTOS_DSCP_CS1 },
1406: { "cs2", IPTOS_DSCP_CS2 },
1407: { "cs3", IPTOS_DSCP_CS3 },
1408: { "cs4", IPTOS_DSCP_CS4 },
1409: { "cs5", IPTOS_DSCP_CS5 },
1410: { "cs6", IPTOS_DSCP_CS6 },
1411: { "cs7", IPTOS_DSCP_CS7 },
1412: { "ef", IPTOS_DSCP_EF },
1413: { "inetcontrol", IPTOS_PREC_INTERNETCONTROL },
1414: { "lowdelay", IPTOS_LOWDELAY },
1415: { "netcontrol", IPTOS_PREC_NETCONTROL },
1416: { "reliability", IPTOS_RELIABILITY },
1417: { "throughput", IPTOS_THROUGHPUT },
1.134 deraadt 1418: { NULL, -1 },
1.102 haesbaer 1419: };
1420:
1421: for (t = toskeywords; t->keyword != NULL; t++) {
1422: if (strcmp(s, t->keyword) == 0) {
1423: *val = t->val;
1424: return (1);
1425: }
1426: }
1.83 dtucker 1427:
1.102 haesbaer 1428: return (0);
1.108 haesbaer 1429: }
1430:
1.133 beck 1431: int
1432: map_tls(char *s, int *val)
1433: {
1434: const struct tlskeywords {
1435: const char *keyword;
1436: int val;
1437: } *t, tlskeywords[] = {
1438: { "tlslegacy", TLS_LEGACY },
1439: { "noverify", TLS_NOVERIFY },
1440: { "noname", TLS_NONAME },
1441: { "clientcert", TLS_CCERT},
1.134 deraadt 1442: { NULL, -1 },
1.133 beck 1443: };
1444:
1445: for (t = tlskeywords; t->keyword != NULL; t++) {
1446: if (strcmp(s, t->keyword) == 0) {
1447: *val |= t->val;
1448: return (1);
1449: }
1450: }
1451: return (0);
1452: }
1453:
1454: void
1455: report_tls(struct tls * tls_ctx, char * host, char *tls_expectname)
1456: {
1457: char *subject = NULL, *issuer = NULL;
1.138 beck 1458: fprintf(stderr, "TLS handshake negotiated %s/%s with host %s\n",
1459: tls_conn_version(tls_ctx), tls_conn_cipher(tls_ctx), host);
1.133 beck 1460: fprintf(stderr, "Peer name %s\n",
1461: tls_expectname ? tls_expectname : host);
1.137 beck 1462: if (tls_peer_cert_subject(tls_ctx))
1463: fprintf(stderr, "Subject: %s\n",
1464: tls_peer_cert_subject(tls_ctx));
1465: if (tls_peer_cert_issuer(tls_ctx))
1466: fprintf(stderr, "Issuer: %s\n",
1467: tls_peer_cert_issuer(tls_ctx));
1468: if (tls_peer_cert_hash(tls_ctx))
1469: fprintf(stderr, "Cert Hash: %s\n",
1470: tls_peer_cert_hash(tls_ctx));
1.133 beck 1471: free(subject);
1472: free(issuer);
1473: }
1.108 haesbaer 1474: void
1475: report_connect(const struct sockaddr *sa, socklen_t salen)
1476: {
1477: char remote_host[NI_MAXHOST];
1478: char remote_port[NI_MAXSERV];
1479: int herr;
1480: int flags = NI_NUMERICSERV;
1.134 deraadt 1481:
1.108 haesbaer 1482: if (nflag)
1483: flags |= NI_NUMERICHOST;
1.134 deraadt 1484:
1.108 haesbaer 1485: if ((herr = getnameinfo(sa, salen,
1486: remote_host, sizeof(remote_host),
1487: remote_port, sizeof(remote_port),
1488: flags)) != 0) {
1489: if (herr == EAI_SYSTEM)
1490: err(1, "getnameinfo");
1491: else
1492: errx(1, "getnameinfo: %s", gai_strerror(herr));
1493: }
1.134 deraadt 1494:
1.108 haesbaer 1495: fprintf(stderr,
1496: "Connection from %s %s "
1497: "received!\n", remote_host, remote_port);
1.7 deraadt 1498: }
1.1 deraadt 1499:
1.11 ericj 1500: void
1.58 deraadt 1501: help(void)
1.1 deraadt 1502: {
1.21 ericj 1503: usage(0);
1504: fprintf(stderr, "\tCommand Summary:\n\
1505: \t-4 Use IPv4\n\
1506: \t-6 Use IPv6\n\
1.135 jmc 1507: \t-C certfile Public key file\n\
1508: \t-c Use TLS\n\
1.73 markus 1509: \t-D Enable the debug socket option\n\
1.69 tedu 1510: \t-d Detach from stdin\n\
1.135 jmc 1511: \t-e name\t Required name in peer certificate\n\
1.114 jmc 1512: \t-F Pass socket fd\n\
1.135 jmc 1513: \t-H hash\t Hash string of peer certificate\n\
1.21 ericj 1514: \t-h This help text\n\
1.90 djm 1515: \t-I length TCP receive buffer length\n\
1.135 jmc 1516: \t-i interval Delay interval for lines sent, ports scanned\n\
1517: \t-K keyfile Private key file\n\
1.21 ericj 1518: \t-k Keep inbound sockets open for multiple connects\n\
1519: \t-l Listen mode, for inbound connects\n\
1.111 sthen 1520: \t-N Shutdown the network socket after EOF on stdin\n\
1.22 jasoni 1521: \t-n Suppress name/port resolutions\n\
1.90 djm 1522: \t-O length TCP send buffer length\n\
1.86 djm 1523: \t-P proxyuser\tUsername for proxy authentication\n\
1.36 jakob 1524: \t-p port\t Specify local port for remote connects\n\
1.135 jmc 1525: \t-R CAfile CA bundle\n\
1.21 ericj 1526: \t-r Randomize remote ports\n\
1.67 jmc 1527: \t-S Enable the TCP MD5 signature option\n\
1.135 jmc 1528: \t-s source Local source address\n\
1529: \t-T keyword TOS value or TLS options\n\
1.21 ericj 1530: \t-t Answer TELNET negotiation\n\
1.67 jmc 1531: \t-U Use UNIX domain socket\n\
1.21 ericj 1532: \t-u UDP mode\n\
1.98 guenther 1533: \t-V rtable Specify alternate routing table\n\
1.21 ericj 1534: \t-v Verbose\n\
1.135 jmc 1535: \t-w timeout Timeout for connects and final net reads\n\
1.75 djm 1536: \t-X proto Proxy protocol: \"4\", \"5\" (SOCKS) or \"connect\"\n\
1537: \t-x addr[:port]\tSpecify proxy address and port\n\
1.21 ericj 1538: \t-z Zero-I/O mode [used for scanning]\n\
1539: Port numbers can be individual or ranges: lo-hi [inclusive]\n");
1540: exit(1);
1.11 ericj 1541: }
1542:
1543: void
1.37 jakob 1544: usage(int ret)
1.11 ericj 1545: {
1.92 sobrado 1546: fprintf(stderr,
1.135 jmc 1547: "usage: nc [-46cDdFhklNnrStUuvz] [-C certfile] [-e name] "
1548: "[-H hash] [-I length]\n"
1549: "\t [-i interval] [-K keyfile] [-O length] [-P proxy_username]\n"
1550: "\t [-p source_port] [-R CAfile] [-s source] "
1551: "[-T keyword] [-V rtable]\n"
1552: "\t [-w timeout] [-X proxy_protocol] [-x proxy_address[:port]]\n"
1.133 beck 1553: "\t [destination] [port]\n");
1.21 ericj 1554: if (ret)
1555: exit(1);
1.7 deraadt 1556: }
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