Annotation of src/usr.bin/nc/netcat.c, Revision 1.224
1.220 tb 1: /* $OpenBSD: netcat.c,v 1.219 2022/06/08 20:07:31 tb 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:
1.200 tedu 45: #include <ctype.h>
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>
1.149 bcook 56: #include <time.h>
1.185 tb 57: #include <tls.h>
1.5 art 58: #include <unistd.h>
1.185 tb 59:
1.79 avsm 60: #include "atomicio.h"
1.51 vincent 61:
1.55 fgsch 62: #define PORT_MAX 65535
1.99 jeremy 63: #define UNIX_DG_TMP_SOCKET_SIZE 19
1.31 ericj 64:
1.185 tb 65: #define POLL_STDIN 0
66: #define POLL_NETOUT 1
67: #define POLL_NETIN 2
68: #define POLL_STDOUT 3
69: #define BUFSIZE 16384
1.133 beck 70:
1.189 jsing 71: #define TLS_NOVERIFY (1 << 1)
72: #define TLS_NONAME (1 << 2)
73: #define TLS_CCERT (1 << 3)
74: #define TLS_MUSTSTAPLE (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 */
1.199 tedu 101: const char *Cflag; /* Public cert file */
102: const char *Kflag; /* Private key file */
103: const char *oflag; /* OCSP stapling file */
104: const char *Rflag; /* Root CA file */
1.133 beck 105: int tls_cachanged; /* Using non-default CA file */
106: int TLSopt; /* TLS options */
107: char *tls_expectname; /* required name in peer cert */
108: char *tls_expecthash; /* required hash of peer cert */
1.189 jsing 109: char *tls_ciphers; /* TLS ciphers */
110: char *tls_protocols; /* TLS protocols */
1.179 beck 111: FILE *Zflag; /* file to save peer cert */
1.133 beck 112:
1.182 bluhm 113: int recvcount, recvlimit;
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;
1.156 jca 118: int ttl = -1;
119: int minttl = -1;
1.21 ericj 120:
1.40 millert 121: void atelnet(int, unsigned char *, unsigned int);
1.183 bluhm 122: int strtoport(char *portstr, int udp);
1.40 millert 123: void build_ports(char *);
1.185 tb 124: void help(void) __attribute__((noreturn));
1.194 bluhm 125: int local_listen(const char *, const char *, struct addrinfo);
1.133 beck 126: void readwrite(int, struct tls *);
1.113 djm 127: void fdpass(int nfd) __attribute__((noreturn));
1.209 job 128: int remote_connect(const char *, const char *, struct addrinfo, char *);
1.175 bluhm 129: int timeout_tls(int, struct tls *, int (*)(struct tls *));
1.103 fgsch 130: int timeout_connect(int, const struct sockaddr *, socklen_t);
1.86 djm 131: int socks_connect(const char *, const char *, struct addrinfo,
132: const char *, const char *, struct addrinfo, int, const char *);
1.40 millert 133: int udptest(int);
1.221 tb 134: void connection_info(const char *, const char *, const char *, const char *);
1.136 deraadt 135: int unix_bind(char *, int);
1.42 ericj 136: int unix_connect(char *);
137: int unix_listen(char *);
1.127 jca 138: void set_common_sockopts(int, int);
1.189 jsing 139: int process_tos_opt(char *, int *);
140: int process_tls_opt(char *, int *);
1.183 bluhm 141: void save_peer_cert(struct tls *_tls_ctx, FILE *_fp);
1.198 bluhm 142: void report_sock(const char *, const struct sockaddr *, socklen_t, char *);
1.183 bluhm 143: void report_tls(struct tls *tls_ctx, char * host);
1.40 millert 144: void usage(int);
1.133 beck 145: ssize_t drainbuf(int, unsigned char *, size_t *, struct tls *);
146: ssize_t fillbuf(int, unsigned char *, size_t *, struct tls *);
147: void tls_setup_client(struct tls *, int, char *);
1.134 deraadt 148: struct tls *tls_setup_server(struct tls *, int, char *);
1.1 deraadt 149:
1.21 ericj 150: int
1.37 jakob 151: main(int argc, char *argv[])
1.21 ericj 152: {
1.154 deraadt 153: int ch, s = -1, ret, socksv;
1.88 ray 154: char *host, *uport;
1.209 job 155: char ipaddr[NI_MAXHOST];
1.21 ericj 156: struct addrinfo hints;
157: socklen_t len;
1.76 hshoexer 158: struct sockaddr_storage cliaddr;
1.183 bluhm 159: char *proxy = NULL, *proxyport = NULL;
1.172 jca 160: const char *errstr;
1.34 jakob 161: struct addrinfo proxyhints;
1.99 jeremy 162: char unix_dg_tmp_socket_buf[UNIX_DG_TMP_SOCKET_SIZE];
1.133 beck 163: struct tls_config *tls_cfg = NULL;
164: struct tls *tls_ctx = NULL;
1.189 jsing 165: uint32_t protocols;
1.11 ericj 166:
1.29 smart 167: ret = 1;
1.46 markus 168: socksv = 5;
1.29 smart 169: host = NULL;
170: uport = NULL;
1.199 tedu 171: Rflag = tls_default_ca_cert_file();
1.129 tobias 172:
173: signal(SIGPIPE, SIG_IGN);
1.29 smart 174:
1.80 mcbride 175: while ((ch = getopt(argc, argv,
1.182 bluhm 176: "46C:cDde:FH:hI:i:K:klM:m:NnO:o:P:p:R:rSs:T:tUuV:vW:w:X:x:Z:z"))
177: != -1) {
1.21 ericj 178: switch (ch) {
179: case '4':
180: family = AF_INET;
181: break;
182: case '6':
183: family = AF_INET6;
184: break;
1.42 ericj 185: case 'U':
186: family = AF_UNIX;
187: break;
1.46 markus 188: case 'X':
1.75 djm 189: if (strcasecmp(optarg, "connect") == 0)
190: socksv = -1; /* HTTP proxy CONNECT */
191: else if (strcmp(optarg, "4") == 0)
192: socksv = 4; /* SOCKS v.4 */
193: else if (strcmp(optarg, "5") == 0)
194: socksv = 5; /* SOCKS v.5 */
195: else
196: errx(1, "unsupported proxy protocol");
1.46 markus 197: break;
1.133 beck 198: case 'C':
199: Cflag = optarg;
200: break;
201: case 'c':
202: usetls = 1;
203: break;
1.68 tedu 204: case 'd':
205: dflag = 1;
206: break;
1.133 beck 207: case 'e':
208: tls_expectname = optarg;
209: break;
1.113 djm 210: case 'F':
211: Fflag = 1;
212: break;
1.133 beck 213: case 'H':
214: tls_expecthash = optarg;
215: break;
1.21 ericj 216: case 'h':
217: help();
218: break;
219: case 'i':
1.88 ray 220: iflag = strtonum(optarg, 0, UINT_MAX, &errstr);
221: if (errstr)
222: errx(1, "interval %s: %s", errstr, optarg);
1.21 ericj 223: break;
1.133 beck 224: case 'K':
225: Kflag = optarg;
226: break;
1.21 ericj 227: case 'k':
228: kflag = 1;
229: break;
230: case 'l':
231: lflag = 1;
232: break;
1.156 jca 233: case 'M':
234: ttl = strtonum(optarg, 0, 255, &errstr);
235: if (errstr)
236: errx(1, "ttl is %s", errstr);
237: break;
238: case 'm':
239: minttl = strtonum(optarg, 0, 255, &errstr);
240: if (errstr)
241: errx(1, "minttl is %s", errstr);
242: break;
1.111 sthen 243: case 'N':
244: Nflag = 1;
245: break;
1.21 ericj 246: case 'n':
247: nflag = 1;
248: break;
1.86 djm 249: case 'P':
250: Pflag = optarg;
251: break;
1.21 ericj 252: case 'p':
253: pflag = optarg;
254: break;
1.133 beck 255: case 'R':
256: tls_cachanged = 1;
257: Rflag = optarg;
258: break;
1.21 ericj 259: case 'r':
260: rflag = 1;
261: break;
262: case 's':
263: sflag = optarg;
264: break;
265: case 't':
266: tflag = 1;
267: break;
268: case 'u':
269: uflag = 1;
270: break;
1.93 claudio 271: case 'V':
1.117 sthen 272: rtableid = (int)strtonum(optarg, 0,
1.93 claudio 273: RT_TABLEID_MAX, &errstr);
274: if (errstr)
1.98 guenther 275: errx(1, "rtable %s: %s", errstr, optarg);
1.93 claudio 276: break;
1.21 ericj 277: case 'v':
278: vflag = 1;
279: break;
1.182 bluhm 280: case 'W':
281: recvlimit = strtonum(optarg, 1, INT_MAX, &errstr);
282: if (errstr)
283: errx(1, "receive limit %s: %s", errstr, optarg);
284: break;
1.70 deraadt 285: case 'w':
1.88 ray 286: timeout = strtonum(optarg, 0, INT_MAX / 1000, &errstr);
287: if (errstr)
288: errx(1, "timeout %s: %s", errstr, optarg);
1.49 hugh 289: timeout *= 1000;
1.21 ericj 290: break;
1.34 jakob 291: case 'x':
292: xflag = 1;
1.64 deraadt 293: if ((proxy = strdup(optarg)) == NULL)
294: err(1, NULL);
1.34 jakob 295: break;
1.179 beck 296: case 'Z':
297: if (strcmp(optarg, "-") == 0)
298: Zflag = stderr;
299: else if ((Zflag = fopen(optarg, "w")) == NULL)
300: err(1, "can't open %s", optarg);
301: break;
1.21 ericj 302: case 'z':
303: zflag = 1;
304: break;
1.73 markus 305: case 'D':
306: Dflag = 1;
307: break;
1.90 djm 308: case 'I':
309: Iflag = strtonum(optarg, 1, 65536 << 14, &errstr);
310: if (errstr != NULL)
311: errx(1, "TCP receive window %s: %s",
312: errstr, optarg);
313: break;
314: case 'O':
315: Oflag = strtonum(optarg, 1, 65536 << 14, &errstr);
316: if (errstr != NULL)
317: errx(1, "TCP send window %s: %s",
318: errstr, optarg);
319: break;
1.168 beck 320: case 'o':
321: oflag = optarg;
322: break;
1.65 markus 323: case 'S':
324: Sflag = 1;
325: break;
1.83 dtucker 326: case 'T':
1.102 haesbaer 327: errstr = NULL;
328: errno = 0;
1.189 jsing 329: if (process_tls_opt(optarg, &TLSopt))
1.102 haesbaer 330: break;
1.189 jsing 331: if (process_tos_opt(optarg, &Tflag))
1.133 beck 332: break;
1.102 haesbaer 333: if (strlen(optarg) > 1 && optarg[0] == '0' &&
334: optarg[1] == 'x')
335: Tflag = (int)strtol(optarg, NULL, 16);
336: else
337: Tflag = (int)strtonum(optarg, 0, 255,
338: &errstr);
339: if (Tflag < 0 || Tflag > 255 || errstr || errno)
1.133 beck 340: errx(1, "illegal tos/tls value %s", optarg);
1.83 dtucker 341: break;
1.21 ericj 342: default:
343: usage(1);
344: }
345: }
346: argc -= optind;
347: argv += optind;
1.11 ericj 348:
1.143 deraadt 349: if (rtableid >= 0)
1.142 benno 350: if (setrtable(rtableid) == -1)
351: err(1, "setrtable");
1.143 deraadt 352:
1.191 beck 353: /* Cruft to make sure options are clean, and used properly. */
1.212 deraadt 354: if (argc == 1 && family == AF_UNIX) {
1.191 beck 355: host = argv[0];
1.212 deraadt 356: } else if (argc == 1 && lflag) {
1.191 beck 357: uport = argv[0];
1.212 deraadt 358: } else if (argc == 2) {
1.191 beck 359: host = argv[0];
360: uport = argv[1];
361: } else
362: usage(1);
1.192 deraadt 363:
364: if (usetls) {
365: if (Cflag && unveil(Cflag, "r") == -1)
1.218 beck 366: err(1, "unveil %s", Cflag);
1.192 deraadt 367: if (unveil(Rflag, "r") == -1)
1.218 beck 368: err(1, "unveil %s", Rflag);
1.192 deraadt 369: if (Kflag && unveil(Kflag, "r") == -1)
1.218 beck 370: err(1, "unveil %s", Kflag);
1.192 deraadt 371: if (oflag && unveil(oflag, "r") == -1)
1.218 beck 372: err(1, "unveil %s", oflag);
1.214 bluhm 373: } else if (family == AF_UNIX && uflag && lflag && !kflag) {
374: /*
375: * After recvfrom(2) from client, the server connects
376: * to the client socket. As the client path is determined
377: * during runtime, we cannot unveil(2).
378: */
1.192 deraadt 379: } else {
380: if (family == AF_UNIX) {
381: if (unveil(host, "rwc") == -1)
1.218 beck 382: err(1, "unveil %s", host);
1.214 bluhm 383: if (uflag && !kflag) {
384: if (sflag) {
385: if (unveil(sflag, "rwc") == -1)
1.218 beck 386: err(1, "unveil %s", sflag);
1.214 bluhm 387: } else {
388: if (unveil("/tmp", "rwc") == -1)
1.218 beck 389: err(1, "unveil /tmp");
1.214 bluhm 390: }
1.192 deraadt 391: }
392: } else {
1.206 mestre 393: /* no filesystem visibility */
1.192 deraadt 394: if (unveil("/", "") == -1)
1.218 beck 395: err(1, "unveil /");
1.192 deraadt 396: }
397: }
1.191 beck 398:
1.142 benno 399: if (family == AF_UNIX) {
1.140 beck 400: if (pledge("stdio rpath wpath cpath tmppath unix", NULL) == -1)
401: err(1, "pledge");
1.186 tb 402: } else if (Fflag && Pflag) {
403: if (pledge("stdio inet dns sendfd tty", NULL) == -1)
404: err(1, "pledge");
1.191 beck 405: } else if (Fflag) {
1.186 tb 406: if (pledge("stdio inet dns sendfd", NULL) == -1)
1.152 beck 407: err(1, "pledge");
1.184 tb 408: } else if (Pflag && usetls) {
409: if (pledge("stdio rpath inet dns tty", NULL) == -1)
410: err(1, "pledge");
1.152 beck 411: } else if (Pflag) {
412: if (pledge("stdio inet dns tty", NULL) == -1)
1.140 beck 413: err(1, "pledge");
1.143 deraadt 414: } else if (usetls) {
1.140 beck 415: if (pledge("stdio rpath inet dns", NULL) == -1)
416: err(1, "pledge");
1.143 deraadt 417: } else if (pledge("stdio inet dns", NULL) == -1)
1.140 beck 418: err(1, "pledge");
1.1 deraadt 419:
1.21 ericj 420: if (lflag && sflag)
421: errx(1, "cannot use -s and -l");
422: if (lflag && pflag)
423: errx(1, "cannot use -p and -l");
424: if (lflag && zflag)
1.32 ericj 425: errx(1, "cannot use -z and -l");
1.21 ericj 426: if (!lflag && kflag)
1.32 ericj 427: errx(1, "must use -l with -k");
1.133 beck 428: if (uflag && usetls)
429: errx(1, "cannot use -c and -u");
430: if ((family == AF_UNIX) && usetls)
431: errx(1, "cannot use -c and -U");
1.140 beck 432: if ((family == AF_UNIX) && Fflag)
433: errx(1, "cannot use -F and -U");
434: if (Fflag && usetls)
435: errx(1, "cannot use -c and -F");
1.133 beck 436: if (TLSopt && !usetls)
437: errx(1, "you must specify -c to use TLS options");
438: if (Cflag && !usetls)
439: errx(1, "you must specify -c to use -C");
440: if (Kflag && !usetls)
441: errx(1, "you must specify -c to use -K");
1.179 beck 442: if (Zflag && !usetls)
443: errx(1, "you must specify -c to use -Z");
1.168 beck 444: if (oflag && !Cflag)
445: errx(1, "you must specify -C to use -o");
1.133 beck 446: if (tls_cachanged && !usetls)
447: errx(1, "you must specify -c to use -R");
448: if (tls_expecthash && !usetls)
449: errx(1, "you must specify -c to use -H");
450: if (tls_expectname && !usetls)
451: errx(1, "you must specify -c to use -e");
1.21 ericj 452:
1.99 jeremy 453: /* Get name of temporary socket for unix datagram client */
454: if ((family == AF_UNIX) && uflag && !lflag) {
455: if (sflag) {
456: unix_dg_tmp_socket = sflag;
457: } else {
458: strlcpy(unix_dg_tmp_socket_buf, "/tmp/nc.XXXXXXXXXX",
1.136 deraadt 459: UNIX_DG_TMP_SOCKET_SIZE);
1.99 jeremy 460: if (mktemp(unix_dg_tmp_socket_buf) == NULL)
461: err(1, "mktemp");
462: unix_dg_tmp_socket = unix_dg_tmp_socket_buf;
463: }
464: }
465:
1.67 jmc 466: /* Initialize addrinfo structure. */
1.42 ericj 467: if (family != AF_UNIX) {
468: memset(&hints, 0, sizeof(struct addrinfo));
469: hints.ai_family = family;
470: hints.ai_socktype = uflag ? SOCK_DGRAM : SOCK_STREAM;
471: hints.ai_protocol = uflag ? IPPROTO_UDP : IPPROTO_TCP;
472: if (nflag)
473: hints.ai_flags |= AI_NUMERICHOST;
474: }
1.1 deraadt 475:
1.34 jakob 476: if (xflag) {
477: if (uflag)
478: errx(1, "no proxy support for UDP mode");
479:
480: if (lflag)
481: errx(1, "no proxy support for listen");
482:
1.42 ericj 483: if (family == AF_UNIX)
484: errx(1, "no proxy support for unix sockets");
485:
1.34 jakob 486: if (sflag)
487: errx(1, "no proxy support for local source address");
488:
1.172 jca 489: if (*proxy == '[') {
490: ++proxy;
491: proxyport = strchr(proxy, ']');
492: if (proxyport == NULL)
493: errx(1, "missing closing bracket in proxy");
494: *proxyport++ = '\0';
495: if (*proxyport == '\0')
496: /* Use default proxy port. */
497: proxyport = NULL;
498: else {
499: if (*proxyport == ':')
500: ++proxyport;
501: else
502: errx(1, "garbage proxy port delimiter");
503: }
504: } else {
505: proxyport = strrchr(proxy, ':');
506: if (proxyport != NULL)
507: *proxyport++ = '\0';
508: }
1.34 jakob 509:
510: memset(&proxyhints, 0, sizeof(struct addrinfo));
511: proxyhints.ai_family = family;
512: proxyhints.ai_socktype = SOCK_STREAM;
513: proxyhints.ai_protocol = IPPROTO_TCP;
514: if (nflag)
515: proxyhints.ai_flags |= AI_NUMERICHOST;
516: }
517:
1.133 beck 518: if (usetls) {
519: if ((tls_cfg = tls_config_new()) == NULL)
520: errx(1, "unable to allocate TLS config");
1.162 jsing 521: if (Rflag && tls_config_set_ca_file(tls_cfg, Rflag) == -1)
522: errx(1, "%s", tls_config_error(tls_cfg));
523: if (Cflag && tls_config_set_cert_file(tls_cfg, Cflag) == -1)
524: errx(1, "%s", tls_config_error(tls_cfg));
525: if (Kflag && tls_config_set_key_file(tls_cfg, Kflag) == -1)
1.168 beck 526: errx(1, "%s", tls_config_error(tls_cfg));
527: if (oflag && tls_config_set_ocsp_staple_file(tls_cfg, oflag) == -1)
1.162 jsing 528: errx(1, "%s", tls_config_error(tls_cfg));
1.189 jsing 529: if (tls_config_parse_protocols(&protocols, tls_protocols) == -1)
530: errx(1, "invalid TLS protocols `%s'", tls_protocols);
531: if (tls_config_set_protocols(tls_cfg, protocols) == -1)
532: errx(1, "%s", tls_config_error(tls_cfg));
533: if (tls_config_set_ciphers(tls_cfg, tls_ciphers) == -1)
534: errx(1, "%s", tls_config_error(tls_cfg));
1.133 beck 535: if (!lflag && (TLSopt & TLS_CCERT))
536: errx(1, "clientcert is only valid with -l");
537: if (TLSopt & TLS_NONAME)
538: tls_config_insecure_noverifyname(tls_cfg);
539: if (TLSopt & TLS_NOVERIFY) {
540: if (tls_expecthash != NULL)
1.186 tb 541: errx(1, "-H and -T noverify may not be used "
542: "together");
1.133 beck 543: tls_config_insecure_noverifycert(tls_cfg);
544: }
1.167 beck 545: if (TLSopt & TLS_MUSTSTAPLE)
546: tls_config_ocsp_require_stapling(tls_cfg);
1.162 jsing 547:
548: if (Pflag) {
549: if (pledge("stdio inet dns tty", NULL) == -1)
550: err(1, "pledge");
551: } else if (pledge("stdio inet dns", NULL) == -1)
552: err(1, "pledge");
1.133 beck 553: }
1.21 ericj 554: if (lflag) {
1.27 ericj 555: ret = 0;
1.1 deraadt 556:
1.99 jeremy 557: if (family == AF_UNIX) {
558: if (uflag)
1.136 deraadt 559: s = unix_bind(host, 0);
1.99 jeremy 560: else
561: s = unix_listen(host);
562: }
1.42 ericj 563:
1.133 beck 564: if (usetls) {
565: tls_config_verify_client_optional(tls_cfg);
566: if ((tls_ctx = tls_server()) == NULL)
567: errx(1, "tls server creation failed");
568: if (tls_configure(tls_ctx, tls_cfg) == -1)
569: errx(1, "tls configuration failed (%s)",
570: tls_error(tls_ctx));
571: }
1.67 jmc 572: /* Allow only one connection at a time, but stay alive. */
1.21 ericj 573: for (;;) {
1.193 bluhm 574: if (family != AF_UNIX) {
575: if (s != -1)
576: close(s);
1.42 ericj 577: s = local_listen(host, uport, hints);
1.193 bluhm 578: }
1.205 deraadt 579: if (s == -1)
1.30 smart 580: err(1, NULL);
1.181 deraadt 581: if (uflag && kflag) {
1.214 bluhm 582: if (family == AF_UNIX) {
583: if (pledge("stdio unix", NULL) == -1)
584: err(1, "pledge");
585: }
1.181 deraadt 586: /*
587: * For UDP and -k, don't connect the socket,
588: * let it receive datagrams from multiple
589: * socket pairs.
590: */
1.133 beck 591: readwrite(s, NULL);
1.181 deraadt 592: } else if (uflag && !kflag) {
593: /*
594: * For UDP and not -k, we will use recvfrom()
595: * initially to wait for a caller, then use
596: * the regular functions to talk to the caller.
597: */
1.188 bluhm 598: int rv;
599: char buf[2048];
1.21 ericj 600: struct sockaddr_storage z;
601:
602: len = sizeof(z);
1.188 bluhm 603: rv = recvfrom(s, buf, sizeof(buf), MSG_PEEK,
1.37 jakob 604: (struct sockaddr *)&z, &len);
1.205 deraadt 605: if (rv == -1)
1.57 stevesk 606: err(1, "recvfrom");
1.21 ericj 607:
1.37 jakob 608: rv = connect(s, (struct sockaddr *)&z, len);
1.205 deraadt 609: if (rv == -1)
1.57 stevesk 610: err(1, "connect");
1.1 deraadt 611:
1.214 bluhm 612: if (family == AF_UNIX) {
613: if (pledge("stdio unix", NULL) == -1)
614: err(1, "pledge");
615: }
1.108 haesbaer 616: if (vflag)
1.198 bluhm 617: report_sock("Connection received",
1.213 bluhm 618: (struct sockaddr *)&z, len,
619: family == AF_UNIX ? host : NULL);
1.108 haesbaer 620:
1.133 beck 621: readwrite(s, NULL);
1.21 ericj 622: } else {
1.195 bluhm 623: struct tls *tls_cctx = NULL;
624: int connfd;
625:
1.78 otto 626: len = sizeof(cliaddr);
1.132 bluhm 627: connfd = accept4(s, (struct sockaddr *)&cliaddr,
628: &len, SOCK_NONBLOCK);
1.110 deraadt 629: if (connfd == -1) {
630: /* For now, all errnos are fatal */
1.125 tedu 631: err(1, "accept");
1.110 deraadt 632: }
1.108 haesbaer 633: if (vflag)
1.198 bluhm 634: report_sock("Connection received",
635: (struct sockaddr *)&cliaddr, len,
1.151 beck 636: family == AF_UNIX ? host : NULL);
1.133 beck 637: if ((usetls) &&
1.134 deraadt 638: (tls_cctx = tls_setup_server(tls_ctx, connfd, host)))
1.133 beck 639: readwrite(connfd, tls_cctx);
640: if (!usetls)
641: readwrite(connfd, NULL);
1.195 bluhm 642: if (tls_cctx)
1.175 bluhm 643: timeout_tls(s, tls_cctx, tls_close);
1.99 jeremy 644: close(connfd);
1.195 bluhm 645: tls_free(tls_cctx);
1.21 ericj 646: }
1.193 bluhm 647: if (family == AF_UNIX && uflag) {
1.205 deraadt 648: if (connect(s, NULL, 0) == -1)
1.99 jeremy 649: err(1, "connect");
650: }
1.27 ericj 651:
1.21 ericj 652: if (!kflag)
653: break;
1.11 ericj 654: }
1.42 ericj 655: } else if (family == AF_UNIX) {
656: ret = 0;
657:
1.177 bluhm 658: if ((s = unix_connect(host)) > 0) {
659: if (!zflag)
660: readwrite(s, NULL);
1.42 ericj 661: close(s);
1.196 dlg 662: } else {
663: warn("%s", host);
1.42 ericj 664: ret = 1;
1.196 dlg 665: }
1.42 ericj 666:
1.99 jeremy 667: if (uflag)
668: unlink(unix_dg_tmp_socket);
1.185 tb 669: return ret;
1.21 ericj 670: } else {
671: int i = 0;
1.6 deraadt 672:
1.67 jmc 673: /* Construct the portlist[] array. */
1.21 ericj 674: build_ports(uport);
1.1 deraadt 675:
1.67 jmc 676: /* Cycle through portlist, connecting to each port. */
1.154 deraadt 677: for (s = -1, i = 0; portlist[i] != NULL; i++) {
678: if (s != -1)
1.21 ericj 679: close(s);
1.195 bluhm 680: tls_free(tls_ctx);
681: tls_ctx = NULL;
1.34 jakob 682:
1.133 beck 683: if (usetls) {
684: if ((tls_ctx = tls_client()) == NULL)
685: errx(1, "tls client creation failed");
686: if (tls_configure(tls_ctx, tls_cfg) == -1)
687: errx(1, "tls configuration failed (%s)",
688: tls_error(tls_ctx));
689: }
1.34 jakob 690: if (xflag)
691: s = socks_connect(host, portlist[i], hints,
1.172 jca 692: proxy, proxyport, proxyhints, socksv,
1.86 djm 693: Pflag);
1.34 jakob 694: else
1.209 job 695: s = remote_connect(host, portlist[i], hints,
696: ipaddr);
1.34 jakob 697:
1.154 deraadt 698: if (s == -1)
1.21 ericj 699: continue;
1.1 deraadt 700:
1.21 ericj 701: ret = 0;
702: if (vflag || zflag) {
1.224 ! tb 703: int print_info = 1;
! 704:
1.67 jmc 705: /* For UDP, make sure we are connected. */
1.21 ericj 706: if (uflag) {
1.224 ! tb 707: /* No info on failed or skipped test. */
! 708: if ((print_info = udptest(s)) == -1) {
1.21 ericj 709: ret = 1;
710: continue;
711: }
712: }
1.224 ! tb 713: if (print_info == 1)
! 714: connection_info(host, portlist[i],
! 715: uflag ? "udp" : "tcp", ipaddr);
1.21 ericj 716: }
1.113 djm 717: if (Fflag)
718: fdpass(s);
1.133 beck 719: else {
720: if (usetls)
721: tls_setup_client(tls_ctx, s, host);
722: if (!zflag)
723: readwrite(s, tls_ctx);
1.195 bluhm 724: if (tls_ctx)
1.175 bluhm 725: timeout_tls(s, tls_ctx, tls_close);
1.133 beck 726: }
1.7 deraadt 727: }
1.11 ericj 728: }
1.1 deraadt 729:
1.154 deraadt 730: if (s != -1)
1.21 ericj 731: close(s);
1.195 bluhm 732: tls_free(tls_ctx);
1.133 beck 733: tls_config_free(tls_cfg);
734:
1.185 tb 735: return ret;
1.7 deraadt 736: }
1.1 deraadt 737:
1.11 ericj 738: /*
1.99 jeremy 739: * unix_bind()
740: * Returns a unix socket bound to the given path
1.42 ericj 741: */
742: int
1.136 deraadt 743: unix_bind(char *path, int flags)
1.42 ericj 744: {
1.144 bcook 745: struct sockaddr_un s_un;
1.155 deraadt 746: int s, save_errno;
1.42 ericj 747:
1.99 jeremy 748: /* Create unix domain socket. */
1.136 deraadt 749: if ((s = socket(AF_UNIX, flags | (uflag ? SOCK_DGRAM : SOCK_STREAM),
1.205 deraadt 750: 0)) == -1)
1.185 tb 751: return -1;
1.42 ericj 752:
1.144 bcook 753: memset(&s_un, 0, sizeof(struct sockaddr_un));
754: s_un.sun_family = AF_UNIX;
1.60 avsm 755:
1.144 bcook 756: if (strlcpy(s_un.sun_path, path, sizeof(s_un.sun_path)) >=
757: sizeof(s_un.sun_path)) {
1.60 avsm 758: close(s);
759: errno = ENAMETOOLONG;
1.185 tb 760: return -1;
1.60 avsm 761: }
1.99 jeremy 762:
1.205 deraadt 763: if (bind(s, (struct sockaddr *)&s_un, sizeof(s_un)) == -1) {
1.155 deraadt 764: save_errno = errno;
1.50 vincent 765: close(s);
1.155 deraadt 766: errno = save_errno;
1.185 tb 767: return -1;
1.42 ericj 768: }
1.198 bluhm 769: if (vflag)
770: report_sock("Bound", NULL, 0, path);
1.185 tb 771:
772: return s;
1.42 ericj 773: }
774:
1.173 bluhm 775: int
1.175 bluhm 776: timeout_tls(int s, struct tls *tls_ctx, int (*func)(struct tls *))
1.173 bluhm 777: {
778: struct pollfd pfd;
779: int ret;
780:
1.175 bluhm 781: while ((ret = (*func)(tls_ctx)) != 0) {
1.173 bluhm 782: if (ret == TLS_WANT_POLLIN)
783: pfd.events = POLLIN;
784: else if (ret == TLS_WANT_POLLOUT)
785: pfd.events = POLLOUT;
786: else
787: break;
788: pfd.fd = s;
789: if ((ret = poll(&pfd, 1, timeout)) == 1)
790: continue;
791: else if (ret == 0) {
792: errno = ETIMEDOUT;
793: ret = -1;
794: break;
795: } else
796: err(1, "poll failed");
797: }
798:
1.185 tb 799: return ret;
1.173 bluhm 800: }
801:
1.133 beck 802: void
803: tls_setup_client(struct tls *tls_ctx, int s, char *host)
804: {
1.173 bluhm 805: const char *errstr;
1.136 deraadt 806:
1.133 beck 807: if (tls_connect_socket(tls_ctx, s,
1.219 tb 808: tls_expectname ? tls_expectname : host) == -1) {
1.133 beck 809: errx(1, "tls connection failed (%s)",
810: tls_error(tls_ctx));
811: }
1.175 bluhm 812: if (timeout_tls(s, tls_ctx, tls_handshake) == -1) {
1.173 bluhm 813: if ((errstr = tls_error(tls_ctx)) == NULL)
814: errstr = strerror(errno);
815: errx(1, "tls handshake failed (%s)", errstr);
816: }
1.133 beck 817: if (vflag)
1.183 bluhm 818: report_tls(tls_ctx, host);
1.215 bluhm 819: if (tls_expecthash && (tls_peer_cert_hash(tls_ctx) == NULL ||
820: strcmp(tls_expecthash, tls_peer_cert_hash(tls_ctx)) != 0))
1.133 beck 821: errx(1, "peer certificate is not %s", tls_expecthash);
1.179 beck 822: if (Zflag) {
823: save_peer_cert(tls_ctx, Zflag);
824: if (Zflag != stderr && (fclose(Zflag) != 0))
825: err(1, "fclose failed saving peer cert");
826: }
1.133 beck 827: }
1.141 deraadt 828:
1.133 beck 829: struct tls *
830: tls_setup_server(struct tls *tls_ctx, int connfd, char *host)
831: {
832: struct tls *tls_cctx;
1.173 bluhm 833: const char *errstr;
1.136 deraadt 834:
1.173 bluhm 835: if (tls_accept_socket(tls_ctx, &tls_cctx, connfd) == -1) {
836: warnx("tls accept failed (%s)", tls_error(tls_ctx));
1.175 bluhm 837: } else if (timeout_tls(connfd, tls_cctx, tls_handshake) == -1) {
1.178 bluhm 838: if ((errstr = tls_error(tls_cctx)) == NULL)
1.173 bluhm 839: errstr = strerror(errno);
840: warnx("tls handshake failed (%s)", errstr);
1.133 beck 841: } else {
842: int gotcert = tls_peer_cert_provided(tls_cctx);
1.136 deraadt 843:
1.133 beck 844: if (vflag && gotcert)
1.183 bluhm 845: report_tls(tls_cctx, host);
1.133 beck 846: if ((TLSopt & TLS_CCERT) && !gotcert)
847: warnx("No client certificate provided");
1.215 bluhm 848: else if (gotcert && tls_expecthash &&
849: (tls_peer_cert_hash(tls_cctx) == NULL ||
850: strcmp(tls_expecthash, tls_peer_cert_hash(tls_cctx)) != 0))
1.133 beck 851: warnx("peer certificate is not %s", tls_expecthash);
852: else if (gotcert && tls_expectname &&
1.134 deraadt 853: (!tls_peer_cert_contains_name(tls_cctx, tls_expectname)))
1.133 beck 854: warnx("name (%s) not found in client cert",
855: tls_expectname);
856: else {
857: return tls_cctx;
858: }
859: }
860: return NULL;
861: }
1.141 deraadt 862:
1.42 ericj 863: /*
1.99 jeremy 864: * unix_connect()
865: * Returns a socket connected to a local unix socket. Returns -1 on failure.
1.42 ericj 866: */
867: int
1.99 jeremy 868: unix_connect(char *path)
1.42 ericj 869: {
1.144 bcook 870: struct sockaddr_un s_un;
1.155 deraadt 871: int s, save_errno;
1.42 ericj 872:
1.99 jeremy 873: if (uflag) {
1.205 deraadt 874: if ((s = unix_bind(unix_dg_tmp_socket, SOCK_CLOEXEC)) == -1)
1.185 tb 875: return -1;
1.99 jeremy 876: } else {
1.205 deraadt 877: if ((s = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0)) == -1)
1.185 tb 878: return -1;
1.99 jeremy 879: }
1.42 ericj 880:
1.144 bcook 881: memset(&s_un, 0, sizeof(struct sockaddr_un));
882: s_un.sun_family = AF_UNIX;
1.60 avsm 883:
1.144 bcook 884: if (strlcpy(s_un.sun_path, path, sizeof(s_un.sun_path)) >=
885: sizeof(s_un.sun_path)) {
1.60 avsm 886: close(s);
887: errno = ENAMETOOLONG;
1.185 tb 888: return -1;
1.60 avsm 889: }
1.205 deraadt 890: if (connect(s, (struct sockaddr *)&s_un, sizeof(s_un)) == -1) {
1.155 deraadt 891: save_errno = errno;
1.42 ericj 892: close(s);
1.155 deraadt 893: errno = save_errno;
1.185 tb 894: return -1;
1.42 ericj 895: }
1.185 tb 896: return s;
1.99 jeremy 897: }
898:
899: /*
900: * unix_listen()
901: * Create a unix domain socket, and listen on it.
902: */
903: int
904: unix_listen(char *path)
905: {
906: int s;
1.198 bluhm 907:
1.205 deraadt 908: if ((s = unix_bind(path, 0)) == -1)
1.185 tb 909: return -1;
1.205 deraadt 910: if (listen(s, 5) == -1) {
1.42 ericj 911: close(s);
1.185 tb 912: return -1;
1.42 ericj 913: }
1.198 bluhm 914: if (vflag)
915: report_sock("Listening", NULL, 0, path);
916:
1.185 tb 917: return s;
1.42 ericj 918: }
919:
920: /*
1.21 ericj 921: * remote_connect()
1.67 jmc 922: * Returns a socket connected to a remote host. Properly binds to a local
923: * port or source address if needed. Returns -1 on failure.
1.11 ericj 924: */
1.21 ericj 925: int
1.209 job 926: remote_connect(const char *host, const char *port, struct addrinfo hints,
927: char *ipaddr)
1.21 ericj 928: {
929: struct addrinfo *res, *res0;
1.209 job 930: int s = -1, error, herr, on = 1, save_errno;
1.21 ericj 931:
1.161 halex 932: if ((error = getaddrinfo(host, port, &hints, &res0)))
1.176 jca 933: errx(1, "getaddrinfo for host \"%s\" port %s: %s", host,
934: port, gai_strerror(error));
1.21 ericj 935:
1.161 halex 936: for (res = res0; res; res = res->ai_next) {
937: if ((s = socket(res->ai_family, res->ai_socktype |
1.205 deraadt 938: SOCK_NONBLOCK, res->ai_protocol)) == -1)
1.21 ericj 939: continue;
940:
1.67 jmc 941: /* Bind to a local port or source address if specified. */
1.21 ericj 942: if (sflag || pflag) {
943: struct addrinfo ahints, *ares;
1.6 deraadt 944:
1.91 markus 945: /* try SO_BINDANY, but don't insist */
946: setsockopt(s, SOL_SOCKET, SO_BINDANY, &on, sizeof(on));
1.21 ericj 947: memset(&ahints, 0, sizeof(struct addrinfo));
1.161 halex 948: ahints.ai_family = res->ai_family;
1.21 ericj 949: ahints.ai_socktype = uflag ? SOCK_DGRAM : SOCK_STREAM;
950: ahints.ai_protocol = uflag ? IPPROTO_UDP : IPPROTO_TCP;
1.25 ericj 951: ahints.ai_flags = AI_PASSIVE;
1.38 jakob 952: if ((error = getaddrinfo(sflag, pflag, &ahints, &ares)))
1.56 stevesk 953: errx(1, "getaddrinfo: %s", gai_strerror(error));
1.21 ericj 954:
955: if (bind(s, (struct sockaddr *)ares->ai_addr,
1.205 deraadt 956: ares->ai_addrlen) == -1)
1.119 guenther 957: err(1, "bind failed");
1.21 ericj 958: freeaddrinfo(ares);
1.6 deraadt 959: }
1.81 marius 960:
1.161 halex 961: set_common_sockopts(s, res->ai_family);
1.6 deraadt 962:
1.210 millert 963: if (ipaddr != NULL) {
964: herr = getnameinfo(res->ai_addr, res->ai_addrlen,
965: ipaddr, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
966: switch (herr) {
967: case 0:
968: break;
969: case EAI_SYSTEM:
1.209 job 970: err(1, "getnameinfo");
1.210 millert 971: default:
1.209 job 972: errx(1, "getnameinfo: %s", gai_strerror(herr));
1.210 millert 973: }
1.209 job 974: }
975:
1.161 halex 976: if (timeout_connect(s, res->ai_addr, res->ai_addrlen) == 0)
1.6 deraadt 977: break;
1.209 job 978:
979: if (vflag) {
980: /* only print IP if there is something to report */
1.210 millert 981: if (nflag || ipaddr == NULL ||
982: (strncmp(host, ipaddr, NI_MAXHOST) == 0))
1.209 job 983: warn("connect to %s port %s (%s) failed", host,
984: port, uflag ? "udp" : "tcp");
985: else
986: warn("connect to %s (%s) port %s (%s) failed",
987: host, ipaddr, port, uflag ? "udp" : "tcp");
988: }
1.34 jakob 989:
1.155 deraadt 990: save_errno = errno;
1.21 ericj 991: close(s);
1.155 deraadt 992: errno = save_errno;
1.21 ericj 993: s = -1;
1.161 halex 994: }
1.21 ericj 995:
1.161 halex 996: freeaddrinfo(res0);
1.1 deraadt 997:
1.185 tb 998: return s;
1.103 fgsch 999: }
1000:
1001: int
1002: timeout_connect(int s, const struct sockaddr *name, socklen_t namelen)
1003: {
1004: struct pollfd pfd;
1005: socklen_t optlen;
1.132 bluhm 1006: int optval;
1.103 fgsch 1007: int ret;
1008:
1009: if ((ret = connect(s, name, namelen)) != 0 && errno == EINPROGRESS) {
1010: pfd.fd = s;
1011: pfd.events = POLLOUT;
1012: if ((ret = poll(&pfd, 1, timeout)) == 1) {
1013: optlen = sizeof(optval);
1014: if ((ret = getsockopt(s, SOL_SOCKET, SO_ERROR,
1015: &optval, &optlen)) == 0) {
1016: errno = optval;
1017: ret = optval == 0 ? 0 : -1;
1018: }
1019: } else if (ret == 0) {
1020: errno = ETIMEDOUT;
1021: ret = -1;
1022: } else
1023: err(1, "poll failed");
1024: }
1025:
1.185 tb 1026: return ret;
1.7 deraadt 1027: }
1.1 deraadt 1028:
1.11 ericj 1029: /*
1.21 ericj 1030: * local_listen()
1.67 jmc 1031: * Returns a socket listening on a local port, binds to specified source
1032: * address. Returns -1 on failure.
1.11 ericj 1033: */
1.21 ericj 1034: int
1.194 bluhm 1035: local_listen(const char *host, const char *port, struct addrinfo hints)
1.21 ericj 1036: {
1037: struct addrinfo *res, *res0;
1.163 bcook 1038: int s = -1, ret, x = 1, save_errno;
1.21 ericj 1039: int error;
1.6 deraadt 1040:
1.67 jmc 1041: /* Allow nodename to be null. */
1.21 ericj 1042: hints.ai_flags |= AI_PASSIVE;
1.7 deraadt 1043:
1.21 ericj 1044: /*
1045: * In the case of binding to a wildcard address
1046: * default to binding to an ipv4 address.
1047: */
1048: if (host == NULL && hints.ai_family == AF_UNSPEC)
1049: hints.ai_family = AF_INET;
1.1 deraadt 1050:
1.161 halex 1051: if ((error = getaddrinfo(host, port, &hints, &res0)))
1.70 deraadt 1052: errx(1, "getaddrinfo: %s", gai_strerror(error));
1.14 ericj 1053:
1.161 halex 1054: for (res = res0; res; res = res->ai_next) {
1055: if ((s = socket(res->ai_family, res->ai_socktype,
1.205 deraadt 1056: res->ai_protocol)) == -1)
1.21 ericj 1057: continue;
1.93 claudio 1058:
1.21 ericj 1059: ret = setsockopt(s, SOL_SOCKET, SO_REUSEPORT, &x, sizeof(x));
1060: if (ret == -1)
1.30 smart 1061: err(1, NULL);
1.81 marius 1062:
1.161 halex 1063: set_common_sockopts(s, res->ai_family);
1.1 deraadt 1064:
1.161 halex 1065: if (bind(s, (struct sockaddr *)res->ai_addr,
1066: res->ai_addrlen) == 0)
1.21 ericj 1067: break;
1.1 deraadt 1068:
1.155 deraadt 1069: save_errno = errno;
1.21 ericj 1070: close(s);
1.155 deraadt 1071: errno = save_errno;
1.21 ericj 1072: s = -1;
1.161 halex 1073: }
1.1 deraadt 1074:
1.47 ericj 1075: if (!uflag && s != -1) {
1.205 deraadt 1076: if (listen(s, 1) == -1)
1.57 stevesk 1077: err(1, "listen");
1.12 ericj 1078: }
1.198 bluhm 1079: if (vflag && s != -1) {
1080: struct sockaddr_storage ss;
1081: socklen_t len;
1082:
1083: len = sizeof(ss);
1084: if (getsockname(s, (struct sockaddr *)&ss, &len) == -1)
1085: err(1, "getsockname");
1086: report_sock(uflag ? "Bound" : "Listening",
1087: (struct sockaddr *)&ss, len, NULL);
1088: }
1.1 deraadt 1089:
1.161 halex 1090: freeaddrinfo(res0);
1.1 deraadt 1091:
1.185 tb 1092: return s;
1.7 deraadt 1093: }
1094:
1.11 ericj 1095: /*
1.21 ericj 1096: * readwrite()
1097: * Loop that polls on the network file descriptor and stdin.
1.11 ericj 1098: */
1.21 ericj 1099: void
1.133 beck 1100: readwrite(int net_fd, struct tls *tls_ctx)
1.6 deraadt 1101: {
1.125 tedu 1102: struct pollfd pfd[4];
1103: int stdin_fd = STDIN_FILENO;
1104: int stdout_fd = STDOUT_FILENO;
1105: unsigned char netinbuf[BUFSIZE];
1106: size_t netinbufpos = 0;
1107: unsigned char stdinbuf[BUFSIZE];
1108: size_t stdinbufpos = 0;
1.216 beck 1109: int n, num_fds;
1.125 tedu 1110: ssize_t ret;
1111:
1112: /* don't read from stdin if requested */
1113: if (dflag)
1114: stdin_fd = -1;
1115:
1116: /* stdin */
1117: pfd[POLL_STDIN].fd = stdin_fd;
1118: pfd[POLL_STDIN].events = POLLIN;
1119:
1120: /* network out */
1121: pfd[POLL_NETOUT].fd = net_fd;
1122: pfd[POLL_NETOUT].events = 0;
1123:
1124: /* network in */
1125: pfd[POLL_NETIN].fd = net_fd;
1126: pfd[POLL_NETIN].events = POLLIN;
1127:
1128: /* stdout */
1129: pfd[POLL_STDOUT].fd = stdout_fd;
1130: pfd[POLL_STDOUT].events = 0;
1131:
1132: while (1) {
1133: /* both inputs are gone, buffers are empty, we are done */
1.216 beck 1134: if (pfd[POLL_STDIN].fd == -1 && pfd[POLL_NETIN].fd == -1 &&
1.174 bluhm 1135: stdinbufpos == 0 && netinbufpos == 0)
1.125 tedu 1136: return;
1137: /* both outputs are gone, we can't continue */
1.216 beck 1138: if (pfd[POLL_NETOUT].fd == -1 && pfd[POLL_STDOUT].fd == -1)
1.125 tedu 1139: return;
1140: /* listen and net in gone, queues empty, done */
1.216 beck 1141: if (lflag && pfd[POLL_NETIN].fd == -1 &&
1142: stdinbufpos == 0 && netinbufpos == 0)
1.125 tedu 1143: return;
1.21 ericj 1144:
1.125 tedu 1145: /* help says -i is for "wait between lines sent". We read and
1146: * write arbitrary amounts of data, and we don't want to start
1147: * scanning for newlines, so this is as good as it gets */
1.21 ericj 1148: if (iflag)
1149: sleep(iflag);
1150:
1.125 tedu 1151: /* poll */
1152: num_fds = poll(pfd, 4, timeout);
1153:
1154: /* treat poll errors */
1.174 bluhm 1155: if (num_fds == -1)
1.125 tedu 1156: err(1, "polling error");
1.49 hugh 1157:
1.125 tedu 1158: /* timeout happened */
1159: if (num_fds == 0)
1.49 hugh 1160: return;
1.21 ericj 1161:
1.125 tedu 1162: /* treat socket error conditions */
1163: for (n = 0; n < 4; n++) {
1164: if (pfd[n].revents & (POLLERR|POLLNVAL)) {
1.216 beck 1165: pfd[n].fd = -1;
1.6 deraadt 1166: }
1.21 ericj 1167: }
1.125 tedu 1168: /* reading is possible after HUP */
1169: if (pfd[POLL_STDIN].events & POLLIN &&
1170: pfd[POLL_STDIN].revents & POLLHUP &&
1.134 deraadt 1171: !(pfd[POLL_STDIN].revents & POLLIN))
1.216 beck 1172: pfd[POLL_STDIN].fd = -1;
1.125 tedu 1173:
1174: if (pfd[POLL_NETIN].events & POLLIN &&
1175: pfd[POLL_NETIN].revents & POLLHUP &&
1.134 deraadt 1176: !(pfd[POLL_NETIN].revents & POLLIN))
1.216 beck 1177: pfd[POLL_NETIN].fd = -1;
1.125 tedu 1178:
1179: if (pfd[POLL_NETOUT].revents & POLLHUP) {
1180: if (Nflag)
1.216 beck 1181: shutdown(pfd[POLL_NETOUT].fd, SHUT_WR);
1182: pfd[POLL_NETOUT].fd = -1;
1.125 tedu 1183: }
1.216 beck 1184: /* if HUP, stop watching stdout */
1185: if (pfd[POLL_STDOUT].revents & POLLHUP)
1186: pfd[POLL_STDOUT].fd = -1;
1.211 beck 1187: /* if no net out, stop watching stdin */
1.216 beck 1188: if (pfd[POLL_NETOUT].fd == -1)
1189: pfd[POLL_STDIN].fd = -1;
1.125 tedu 1190: /* if no stdout, stop watching net in */
1.216 beck 1191: if (pfd[POLL_STDOUT].fd == -1) {
1192: if (pfd[POLL_NETIN].fd != -1)
1193: shutdown(pfd[POLL_NETIN].fd, SHUT_RD);
1194: pfd[POLL_NETIN].fd = -1;
1.125 tedu 1195: }
1.21 ericj 1196:
1.125 tedu 1197: /* try to read from stdin */
1198: if (pfd[POLL_STDIN].revents & POLLIN && stdinbufpos < BUFSIZE) {
1199: ret = fillbuf(pfd[POLL_STDIN].fd, stdinbuf,
1.133 beck 1200: &stdinbufpos, NULL);
1201: if (ret == TLS_WANT_POLLIN)
1202: pfd[POLL_STDIN].events = POLLIN;
1203: else if (ret == TLS_WANT_POLLOUT)
1204: pfd[POLL_STDIN].events = POLLOUT;
1205: else if (ret == 0 || ret == -1)
1.216 beck 1206: pfd[POLL_STDIN].fd = -1;
1.125 tedu 1207: /* read something - poll net out */
1208: if (stdinbufpos > 0)
1209: pfd[POLL_NETOUT].events = POLLOUT;
1210: /* filled buffer - remove self from polling */
1211: if (stdinbufpos == BUFSIZE)
1212: pfd[POLL_STDIN].events = 0;
1213: }
1214: /* try to write to network */
1215: if (pfd[POLL_NETOUT].revents & POLLOUT && stdinbufpos > 0) {
1216: ret = drainbuf(pfd[POLL_NETOUT].fd, stdinbuf,
1.133 beck 1217: &stdinbufpos, tls_ctx);
1218: if (ret == TLS_WANT_POLLIN)
1219: pfd[POLL_NETOUT].events = POLLIN;
1220: else if (ret == TLS_WANT_POLLOUT)
1221: pfd[POLL_NETOUT].events = POLLOUT;
1222: else if (ret == -1)
1.216 beck 1223: pfd[POLL_NETOUT].fd = -1;
1.125 tedu 1224: /* buffer empty - remove self from polling */
1225: if (stdinbufpos == 0)
1226: pfd[POLL_NETOUT].events = 0;
1227: /* buffer no longer full - poll stdin again */
1228: if (stdinbufpos < BUFSIZE)
1229: pfd[POLL_STDIN].events = POLLIN;
1230: }
1231: /* try to read from network */
1232: if (pfd[POLL_NETIN].revents & POLLIN && netinbufpos < BUFSIZE) {
1233: ret = fillbuf(pfd[POLL_NETIN].fd, netinbuf,
1.133 beck 1234: &netinbufpos, tls_ctx);
1235: if (ret == TLS_WANT_POLLIN)
1236: pfd[POLL_NETIN].events = POLLIN;
1237: else if (ret == TLS_WANT_POLLOUT)
1238: pfd[POLL_NETIN].events = POLLOUT;
1239: else if (ret == -1)
1.216 beck 1240: pfd[POLL_NETIN].fd = -1;
1.125 tedu 1241: /* eof on net in - remove from pfd */
1242: if (ret == 0) {
1.216 beck 1243: shutdown(pfd[POLL_NETIN].fd, SHUT_RD);
1244: pfd[POLL_NETIN].fd = -1;
1.50 vincent 1245: }
1.182 bluhm 1246: if (recvlimit > 0 && ++recvcount >= recvlimit) {
1.216 beck 1247: if (pfd[POLL_NETIN].fd != -1)
1248: shutdown(pfd[POLL_NETIN].fd, SHUT_RD);
1249: pfd[POLL_NETIN].fd = -1;
1250: pfd[POLL_STDIN].fd = -1;
1.182 bluhm 1251: }
1.125 tedu 1252: /* read something - poll stdout */
1253: if (netinbufpos > 0)
1254: pfd[POLL_STDOUT].events = POLLOUT;
1255: /* filled buffer - remove self from polling */
1256: if (netinbufpos == BUFSIZE)
1257: pfd[POLL_NETIN].events = 0;
1258: /* handle telnet */
1259: if (tflag)
1260: atelnet(pfd[POLL_NETIN].fd, netinbuf,
1261: netinbufpos);
1262: }
1263: /* try to write to stdout */
1264: if (pfd[POLL_STDOUT].revents & POLLOUT && netinbufpos > 0) {
1265: ret = drainbuf(pfd[POLL_STDOUT].fd, netinbuf,
1.133 beck 1266: &netinbufpos, NULL);
1267: if (ret == TLS_WANT_POLLIN)
1268: pfd[POLL_STDOUT].events = POLLIN;
1269: else if (ret == TLS_WANT_POLLOUT)
1270: pfd[POLL_STDOUT].events = POLLOUT;
1271: else if (ret == -1)
1.216 beck 1272: pfd[POLL_STDOUT].fd = -1;
1.125 tedu 1273: /* buffer empty - remove self from polling */
1274: if (netinbufpos == 0)
1275: pfd[POLL_STDOUT].events = 0;
1276: /* buffer no longer full - poll net in again */
1277: if (netinbufpos < BUFSIZE)
1278: pfd[POLL_NETIN].events = POLLIN;
1279: }
1280:
1281: /* stdin gone and queue empty? */
1.216 beck 1282: if (pfd[POLL_STDIN].fd == -1 && stdinbufpos == 0) {
1283: if (pfd[POLL_NETOUT].fd != -1 && Nflag)
1284: shutdown(pfd[POLL_NETOUT].fd, SHUT_WR);
1285: pfd[POLL_NETOUT].fd = -1;
1.125 tedu 1286: }
1287: /* net in gone and queue empty? */
1.216 beck 1288: if (pfd[POLL_NETIN].fd == -1 && netinbufpos == 0) {
1289: pfd[POLL_STDOUT].fd = -1;
1.207 beck 1290: }
1.11 ericj 1291: }
1.125 tedu 1292: }
1293:
1294: ssize_t
1.133 beck 1295: drainbuf(int fd, unsigned char *buf, size_t *bufpos, struct tls *tls)
1.125 tedu 1296: {
1297: ssize_t n;
1298: ssize_t adjust;
1299:
1.203 jsing 1300: if (tls) {
1.133 beck 1301: n = tls_write(tls, buf, *bufpos);
1.203 jsing 1302: if (n == -1)
1303: errx(1, "tls write failed (%s)", tls_error(tls));
1304: } else {
1.133 beck 1305: n = write(fd, buf, *bufpos);
1306: /* don't treat EAGAIN, EINTR as error */
1307: if (n == -1 && (errno == EAGAIN || errno == EINTR))
1308: n = TLS_WANT_POLLOUT;
1309: }
1.125 tedu 1310: if (n <= 0)
1311: return n;
1312: /* adjust buffer */
1313: adjust = *bufpos - n;
1314: if (adjust > 0)
1315: memmove(buf, buf + n, adjust);
1316: *bufpos -= n;
1317: return n;
1318: }
1319:
1320: ssize_t
1.133 beck 1321: fillbuf(int fd, unsigned char *buf, size_t *bufpos, struct tls *tls)
1.125 tedu 1322: {
1323: size_t num = BUFSIZE - *bufpos;
1324: ssize_t n;
1325:
1.203 jsing 1326: if (tls) {
1.133 beck 1327: n = tls_read(tls, buf + *bufpos, num);
1.203 jsing 1328: if (n == -1)
1329: errx(1, "tls read failed (%s)", tls_error(tls));
1330: } else {
1.133 beck 1331: n = read(fd, buf + *bufpos, num);
1332: /* don't treat EAGAIN, EINTR as error */
1333: if (n == -1 && (errno == EAGAIN || errno == EINTR))
1334: n = TLS_WANT_POLLIN;
1335: }
1.125 tedu 1336: if (n <= 0)
1337: return n;
1338: *bufpos += n;
1339: return n;
1.113 djm 1340: }
1341:
1342: /*
1343: * fdpass()
1344: * Pass the connected file descriptor to stdout and exit.
1345: */
1346: void
1347: fdpass(int nfd)
1348: {
1349: struct msghdr mh;
1350: union {
1351: struct cmsghdr hdr;
1352: char buf[CMSG_SPACE(sizeof(int))];
1353: } cmsgbuf;
1354: struct cmsghdr *cmsg;
1355: struct iovec iov;
1356: char c = '\0';
1357: ssize_t r;
1358: struct pollfd pfd;
1359:
1360: /* Avoid obvious stupidity */
1361: if (isatty(STDOUT_FILENO))
1362: errx(1, "Cannot pass file descriptor to tty");
1363:
1.202 mestre 1364: memset(&mh, 0, sizeof(mh));
1365: memset(&cmsgbuf, 0, sizeof(cmsgbuf));
1366: memset(&iov, 0, sizeof(iov));
1.113 djm 1367:
1368: mh.msg_control = (caddr_t)&cmsgbuf.buf;
1369: mh.msg_controllen = sizeof(cmsgbuf.buf);
1370: cmsg = CMSG_FIRSTHDR(&mh);
1371: cmsg->cmsg_len = CMSG_LEN(sizeof(int));
1372: cmsg->cmsg_level = SOL_SOCKET;
1373: cmsg->cmsg_type = SCM_RIGHTS;
1374: *(int *)CMSG_DATA(cmsg) = nfd;
1375:
1376: iov.iov_base = &c;
1377: iov.iov_len = 1;
1378: mh.msg_iov = &iov;
1379: mh.msg_iovlen = 1;
1380:
1.202 mestre 1381: memset(&pfd, 0, sizeof(pfd));
1.113 djm 1382: pfd.fd = STDOUT_FILENO;
1.128 tobias 1383: pfd.events = POLLOUT;
1.113 djm 1384: for (;;) {
1385: r = sendmsg(STDOUT_FILENO, &mh, 0);
1386: if (r == -1) {
1387: if (errno == EAGAIN || errno == EINTR) {
1388: if (poll(&pfd, 1, -1) == -1)
1389: err(1, "poll");
1390: continue;
1391: }
1392: err(1, "sendmsg");
1.128 tobias 1393: } else if (r != 1)
1.113 djm 1394: errx(1, "sendmsg: unexpected return value %zd", r);
1395: else
1396: break;
1397: }
1398: exit(0);
1.7 deraadt 1399: }
1.50 vincent 1400:
1.67 jmc 1401: /* Deal with RFC 854 WILL/WONT DO/DONT negotiation. */
1.21 ericj 1402: void
1.37 jakob 1403: atelnet(int nfd, unsigned char *buf, unsigned int size)
1.6 deraadt 1404: {
1.24 ericj 1405: unsigned char *p, *end;
1406: unsigned char obuf[4];
1407:
1.95 nicm 1408: if (size < 3)
1409: return;
1410: end = buf + size - 2;
1.24 ericj 1411:
1412: for (p = buf; p < end; p++) {
1.21 ericj 1413: if (*p != IAC)
1.95 nicm 1414: continue;
1.24 ericj 1415:
1.25 ericj 1416: obuf[0] = IAC;
1.24 ericj 1417: p++;
1.50 vincent 1418: if ((*p == WILL) || (*p == WONT))
1.24 ericj 1419: obuf[1] = DONT;
1.95 nicm 1420: else if ((*p == DO) || (*p == DONT))
1.24 ericj 1421: obuf[1] = WONT;
1.95 nicm 1422: else
1423: continue;
1424:
1425: p++;
1426: obuf[2] = *p;
1427: if (atomicio(vwrite, nfd, obuf, 3) != 3)
1428: warn("Write Error!");
1.11 ericj 1429: }
1.7 deraadt 1430: }
1431:
1.153 beck 1432: int
1433: strtoport(char *portstr, int udp)
1434: {
1435: struct servent *entry;
1436: const char *errstr;
1437: char *proto;
1438: int port = -1;
1439:
1440: proto = udp ? "udp" : "tcp";
1441:
1442: port = strtonum(portstr, 1, PORT_MAX, &errstr);
1443: if (errstr == NULL)
1444: return port;
1445: if (errno != EINVAL)
1446: errx(1, "port number %s: %s", errstr, portstr);
1447: if ((entry = getservbyname(portstr, proto)) == NULL)
1448: errx(1, "service \"%s\" unknown", portstr);
1449: return ntohs(entry->s_port);
1450: }
1451:
1.11 ericj 1452: /*
1.21 ericj 1453: * build_ports()
1.105 lum 1454: * Build an array of ports in portlist[], listing each port
1.67 jmc 1455: * that we should try to connect to.
1.11 ericj 1456: */
1.21 ericj 1457: void
1.37 jakob 1458: build_ports(char *p)
1.6 deraadt 1459: {
1.88 ray 1460: char *n;
1.21 ericj 1461: int hi, lo, cp;
1462: int x = 0;
1463:
1.200 tedu 1464: if (isdigit((unsigned char)*p) && (n = strchr(p, '-')) != NULL) {
1.21 ericj 1465: *n = '\0';
1466: n++;
1467:
1.67 jmc 1468: /* Make sure the ports are in order: lowest->highest. */
1.153 beck 1469: hi = strtoport(n, uflag);
1470: lo = strtoport(p, uflag);
1.21 ericj 1471: if (lo > hi) {
1472: cp = hi;
1473: hi = lo;
1474: lo = cp;
1475: }
1476:
1.145 tb 1477: /*
1478: * Initialize portlist with a random permutation. Based on
1479: * Knuth, as in ip_randomid() in sys/netinet/ip_id.c.
1480: */
1.21 ericj 1481: if (rflag) {
1.145 tb 1482: for (x = 0; x <= hi - lo; x++) {
1483: cp = arc4random_uniform(x + 1);
1484: portlist[x] = portlist[cp];
1.204 deraadt 1485: if (asprintf(&portlist[cp], "%d", x + lo) == -1)
1.145 tb 1486: err(1, "asprintf");
1487: }
1488: } else { /* Load ports sequentially. */
1489: for (cp = lo; cp <= hi; cp++) {
1.204 deraadt 1490: if (asprintf(&portlist[x], "%d", cp) == -1)
1.145 tb 1491: err(1, "asprintf");
1492: x++;
1.6 deraadt 1493: }
1.11 ericj 1494: }
1.21 ericj 1495: } else {
1.153 beck 1496: char *tmp;
1497:
1498: hi = strtoport(p, uflag);
1499: if (asprintf(&tmp, "%d", hi) != -1)
1500: portlist[0] = tmp;
1501: else
1.55 fgsch 1502: err(1, NULL);
1.11 ericj 1503: }
1.13 ericj 1504: }
1505:
1506: /*
1.21 ericj 1507: * udptest()
1508: * Do a few writes to see if the UDP port is there.
1.105 lum 1509: * Fails once PF state table is full.
1.13 ericj 1510: */
1.21 ericj 1511: int
1.37 jakob 1512: udptest(int s)
1.13 ericj 1513: {
1.74 deraadt 1514: int i, ret;
1.13 ericj 1515:
1.223 tb 1516: /* Only write to the socket in scan mode or interactive mode. */
1517: if (!zflag && !isatty(STDIN_FILENO))
1518: return 0;
1519:
1.52 vincent 1520: for (i = 0; i <= 3; i++) {
1.74 deraadt 1521: if (write(s, "X", 1) == 1)
1.21 ericj 1522: ret = 1;
1.14 ericj 1523: else
1.21 ericj 1524: ret = -1;
1.14 ericj 1525: }
1.185 tb 1526: return ret;
1.220 tb 1527: }
1528:
1529: void
1.221 tb 1530: connection_info(const char *host, const char *port, const char *proto,
1531: const char *ipaddr)
1.220 tb 1532: {
1533: struct servent *sv;
1.222 tb 1534: char *service = "*";
1.220 tb 1535:
1.222 tb 1536: /* Look up service name unless -n. */
1537: if (!nflag) {
1.221 tb 1538: sv = getservbyport(ntohs(atoi(port)), proto);
1.222 tb 1539: if (sv != NULL)
1540: service = sv->s_name;
1.220 tb 1541: }
1542:
1543: fprintf(stderr, "Connection to %s", host);
1544:
1545: /*
1546: * if we aren't connecting thru a proxy and
1547: * there is something to report, print IP
1548: */
1549: if (!nflag && !xflag && strcmp(host, ipaddr) != 0)
1550: fprintf(stderr, " (%s)", ipaddr);
1551:
1.222 tb 1552: fprintf(stderr, " %s port [%s/%s] succeeded!\n", port, proto, service);
1.81 marius 1553: }
1554:
1.84 dtucker 1555: void
1.127 jca 1556: set_common_sockopts(int s, int af)
1.81 marius 1557: {
1558: int x = 1;
1559:
1560: if (Sflag) {
1561: if (setsockopt(s, IPPROTO_TCP, TCP_MD5SIG,
1.219 tb 1562: &x, sizeof(x)) == -1)
1.81 marius 1563: err(1, NULL);
1564: }
1565: if (Dflag) {
1566: if (setsockopt(s, SOL_SOCKET, SO_DEBUG,
1.219 tb 1567: &x, sizeof(x)) == -1)
1.81 marius 1568: err(1, NULL);
1569: }
1.83 dtucker 1570: if (Tflag != -1) {
1.157 bcook 1571: if (af == AF_INET && setsockopt(s, IPPROTO_IP,
1572: IP_TOS, &Tflag, sizeof(Tflag)) == -1)
1573: err(1, "set IP ToS");
1.127 jca 1574:
1.157 bcook 1575: else if (af == AF_INET6 && setsockopt(s, IPPROTO_IPV6,
1576: IPV6_TCLASS, &Tflag, sizeof(Tflag)) == -1)
1577: err(1, "set IPv6 traffic class");
1.83 dtucker 1578: }
1.90 djm 1579: if (Iflag) {
1580: if (setsockopt(s, SOL_SOCKET, SO_RCVBUF,
1581: &Iflag, sizeof(Iflag)) == -1)
1582: err(1, "set TCP receive buffer size");
1583: }
1584: if (Oflag) {
1585: if (setsockopt(s, SOL_SOCKET, SO_SNDBUF,
1586: &Oflag, sizeof(Oflag)) == -1)
1587: err(1, "set TCP send buffer size");
1588: }
1.157 bcook 1589:
1590: if (ttl != -1) {
1591: if (af == AF_INET && setsockopt(s, IPPROTO_IP,
1592: IP_TTL, &ttl, sizeof(ttl)))
1593: err(1, "set IP TTL");
1594:
1595: else if (af == AF_INET6 && setsockopt(s, IPPROTO_IPV6,
1596: IPV6_UNICAST_HOPS, &ttl, sizeof(ttl)))
1597: err(1, "set IPv6 unicast hops");
1598: }
1599:
1600: if (minttl != -1) {
1601: if (af == AF_INET && setsockopt(s, IPPROTO_IP,
1602: IP_MINTTL, &minttl, sizeof(minttl)))
1603: err(1, "set IP min TTL");
1604:
1605: else if (af == AF_INET6 && setsockopt(s, IPPROTO_IPV6,
1606: IPV6_MINHOPCOUNT, &minttl, sizeof(minttl)))
1607: err(1, "set IPv6 min hop count");
1.156 jca 1608: }
1.83 dtucker 1609: }
1610:
1611: int
1.189 jsing 1612: process_tos_opt(char *s, int *val)
1.83 dtucker 1613: {
1.102 haesbaer 1614: /* DiffServ Codepoints and other TOS mappings */
1615: const struct toskeywords {
1616: const char *keyword;
1617: int val;
1618: } *t, toskeywords[] = {
1619: { "af11", IPTOS_DSCP_AF11 },
1620: { "af12", IPTOS_DSCP_AF12 },
1621: { "af13", IPTOS_DSCP_AF13 },
1622: { "af21", IPTOS_DSCP_AF21 },
1623: { "af22", IPTOS_DSCP_AF22 },
1624: { "af23", IPTOS_DSCP_AF23 },
1625: { "af31", IPTOS_DSCP_AF31 },
1626: { "af32", IPTOS_DSCP_AF32 },
1627: { "af33", IPTOS_DSCP_AF33 },
1628: { "af41", IPTOS_DSCP_AF41 },
1629: { "af42", IPTOS_DSCP_AF42 },
1630: { "af43", IPTOS_DSCP_AF43 },
1631: { "critical", IPTOS_PREC_CRITIC_ECP },
1632: { "cs0", IPTOS_DSCP_CS0 },
1633: { "cs1", IPTOS_DSCP_CS1 },
1634: { "cs2", IPTOS_DSCP_CS2 },
1635: { "cs3", IPTOS_DSCP_CS3 },
1636: { "cs4", IPTOS_DSCP_CS4 },
1637: { "cs5", IPTOS_DSCP_CS5 },
1638: { "cs6", IPTOS_DSCP_CS6 },
1639: { "cs7", IPTOS_DSCP_CS7 },
1640: { "ef", IPTOS_DSCP_EF },
1641: { "inetcontrol", IPTOS_PREC_INTERNETCONTROL },
1642: { "lowdelay", IPTOS_LOWDELAY },
1643: { "netcontrol", IPTOS_PREC_NETCONTROL },
1644: { "reliability", IPTOS_RELIABILITY },
1645: { "throughput", IPTOS_THROUGHPUT },
1.134 deraadt 1646: { NULL, -1 },
1.102 haesbaer 1647: };
1648:
1649: for (t = toskeywords; t->keyword != NULL; t++) {
1650: if (strcmp(s, t->keyword) == 0) {
1651: *val = t->val;
1.185 tb 1652: return 1;
1.102 haesbaer 1653: }
1654: }
1.83 dtucker 1655:
1.185 tb 1656: return 0;
1.108 haesbaer 1657: }
1658:
1.133 beck 1659: int
1.189 jsing 1660: process_tls_opt(char *s, int *flags)
1.133 beck 1661: {
1.189 jsing 1662: size_t len;
1663: char *v;
1664:
1.133 beck 1665: const struct tlskeywords {
1666: const char *keyword;
1.189 jsing 1667: int flag;
1668: char **value;
1.133 beck 1669: } *t, tlskeywords[] = {
1.189 jsing 1670: { "ciphers", -1, &tls_ciphers },
1671: { "clientcert", TLS_CCERT, NULL },
1672: { "muststaple", TLS_MUSTSTAPLE, NULL },
1673: { "noverify", TLS_NOVERIFY, NULL },
1674: { "noname", TLS_NONAME, NULL },
1675: { "protocols", -1, &tls_protocols },
1676: { NULL, -1, NULL },
1.133 beck 1677: };
1678:
1.189 jsing 1679: len = strlen(s);
1680: if ((v = strchr(s, '=')) != NULL) {
1681: len = v - s;
1682: v++;
1683: }
1684:
1.133 beck 1685: for (t = tlskeywords; t->keyword != NULL; t++) {
1.189 jsing 1686: if (strlen(t->keyword) == len &&
1687: strncmp(s, t->keyword, len) == 0) {
1688: if (t->value != NULL) {
1689: if (v == NULL)
1690: errx(1, "invalid tls value `%s'", s);
1691: *t->value = v;
1692: } else {
1693: *flags |= t->flag;
1694: }
1.185 tb 1695: return 1;
1.133 beck 1696: }
1697: }
1.185 tb 1698: return 0;
1.179 beck 1699: }
1700:
1701: void
1702: save_peer_cert(struct tls *tls_ctx, FILE *fp)
1703: {
1704: const char *pem;
1705: size_t plen;
1706:
1707: if ((pem = tls_peer_cert_chain_pem(tls_ctx, &plen)) == NULL)
1708: errx(1, "Can't get peer certificate");
1.183 bluhm 1709: if (fprintf(fp, "%.*s", (int)plen, pem) < 0)
1.179 beck 1710: err(1, "unable to save peer cert");
1711: if (fflush(fp) != 0)
1712: err(1, "unable to flush peer cert");
1.133 beck 1713: }
1714:
1715: void
1.219 tb 1716: report_tls(struct tls *tls_ctx, char *host)
1.133 beck 1717: {
1.147 beck 1718: time_t t;
1.164 beck 1719: const char *ocsp_url;
1720:
1.138 beck 1721: fprintf(stderr, "TLS handshake negotiated %s/%s with host %s\n",
1722: tls_conn_version(tls_ctx), tls_conn_cipher(tls_ctx), host);
1.148 mmcc 1723: fprintf(stderr, "Peer name: %s\n",
1.133 beck 1724: tls_expectname ? tls_expectname : host);
1.137 beck 1725: if (tls_peer_cert_subject(tls_ctx))
1726: fprintf(stderr, "Subject: %s\n",
1727: tls_peer_cert_subject(tls_ctx));
1728: if (tls_peer_cert_issuer(tls_ctx))
1729: fprintf(stderr, "Issuer: %s\n",
1730: tls_peer_cert_issuer(tls_ctx));
1.147 beck 1731: if ((t = tls_peer_cert_notbefore(tls_ctx)) != -1)
1732: fprintf(stderr, "Valid From: %s", ctime(&t));
1733: if ((t = tls_peer_cert_notafter(tls_ctx)) != -1)
1734: fprintf(stderr, "Valid Until: %s", ctime(&t));
1.137 beck 1735: if (tls_peer_cert_hash(tls_ctx))
1736: fprintf(stderr, "Cert Hash: %s\n",
1737: tls_peer_cert_hash(tls_ctx));
1.164 beck 1738: ocsp_url = tls_peer_ocsp_url(tls_ctx);
1.166 beck 1739: if (ocsp_url != NULL)
1740: fprintf(stderr, "OCSP URL: %s\n", ocsp_url);
1.164 beck 1741: switch (tls_peer_ocsp_response_status(tls_ctx)) {
1742: case TLS_OCSP_RESPONSE_SUCCESSFUL:
1.165 beck 1743: fprintf(stderr, "OCSP Stapling: %s\n",
1.219 tb 1744: tls_peer_ocsp_result(tls_ctx) == NULL ? "" :
1.164 beck 1745: tls_peer_ocsp_result(tls_ctx));
1746: fprintf(stderr,
1747: " response_status=%d cert_status=%d crl_reason=%d\n",
1748: tls_peer_ocsp_response_status(tls_ctx),
1749: tls_peer_ocsp_cert_status(tls_ctx),
1750: tls_peer_ocsp_crl_reason(tls_ctx));
1751: t = tls_peer_ocsp_this_update(tls_ctx);
1752: fprintf(stderr, " this update: %s",
1753: t != -1 ? ctime(&t) : "\n");
1.219 tb 1754: t = tls_peer_ocsp_next_update(tls_ctx);
1.164 beck 1755: fprintf(stderr, " next update: %s",
1756: t != -1 ? ctime(&t) : "\n");
1.219 tb 1757: t = tls_peer_ocsp_revocation_time(tls_ctx);
1.164 beck 1758: fprintf(stderr, " revocation: %s",
1759: t != -1 ? ctime(&t) : "\n");
1760: break;
1761: case -1:
1762: break;
1763: default:
1.219 tb 1764: fprintf(stderr,
1765: "OCSP Stapling: failure - response_status %d (%s)\n",
1.164 beck 1766: tls_peer_ocsp_response_status(tls_ctx),
1.219 tb 1767: tls_peer_ocsp_result(tls_ctx) == NULL ? "" :
1.164 beck 1768: tls_peer_ocsp_result(tls_ctx));
1769: break;
1770: }
1.133 beck 1771: }
1.147 beck 1772:
1.108 haesbaer 1773: void
1.198 bluhm 1774: report_sock(const char *msg, const struct sockaddr *sa, socklen_t salen,
1775: char *path)
1.108 haesbaer 1776: {
1.198 bluhm 1777: char host[NI_MAXHOST], port[NI_MAXSERV];
1.108 haesbaer 1778: int herr;
1779: int flags = NI_NUMERICSERV;
1.151 beck 1780:
1781: if (path != NULL) {
1.198 bluhm 1782: fprintf(stderr, "%s on %s\n", msg, path);
1.151 beck 1783: return;
1784: }
1.134 deraadt 1785:
1.108 haesbaer 1786: if (nflag)
1787: flags |= NI_NUMERICHOST;
1.134 deraadt 1788:
1.213 bluhm 1789: herr = getnameinfo(sa, salen, host, sizeof(host), port, sizeof(port),
1790: flags);
1791: switch (herr) {
1.219 tb 1792: case 0:
1793: break;
1794: case EAI_SYSTEM:
1795: err(1, "getnameinfo");
1796: default:
1797: errx(1, "getnameinfo: %s", gai_strerror(herr));
1.108 haesbaer 1798: }
1.134 deraadt 1799:
1.198 bluhm 1800: fprintf(stderr, "%s on %s %s\n", msg, host, port);
1.7 deraadt 1801: }
1.1 deraadt 1802:
1.11 ericj 1803: void
1.58 deraadt 1804: help(void)
1.1 deraadt 1805: {
1.21 ericj 1806: usage(0);
1807: fprintf(stderr, "\tCommand Summary:\n\
1808: \t-4 Use IPv4\n\
1809: \t-6 Use IPv6\n\
1.135 jmc 1810: \t-C certfile Public key file\n\
1811: \t-c Use TLS\n\
1.73 markus 1812: \t-D Enable the debug socket option\n\
1.69 tedu 1813: \t-d Detach from stdin\n\
1.135 jmc 1814: \t-e name\t Required name in peer certificate\n\
1.114 jmc 1815: \t-F Pass socket fd\n\
1.135 jmc 1816: \t-H hash\t Hash string of peer certificate\n\
1.21 ericj 1817: \t-h This help text\n\
1.90 djm 1818: \t-I length TCP receive buffer length\n\
1.135 jmc 1819: \t-i interval Delay interval for lines sent, ports scanned\n\
1820: \t-K keyfile Private key file\n\
1.21 ericj 1821: \t-k Keep inbound sockets open for multiple connects\n\
1822: \t-l Listen mode, for inbound connects\n\
1.156 jca 1823: \t-M ttl Outgoing TTL / Hop Limit\n\
1824: \t-m minttl Minimum incoming TTL / Hop Limit\n\
1.111 sthen 1825: \t-N Shutdown the network socket after EOF on stdin\n\
1.22 jasoni 1826: \t-n Suppress name/port resolutions\n\
1.90 djm 1827: \t-O length TCP send buffer length\n\
1.169 jmc 1828: \t-o staplefile Staple file\n\
1.86 djm 1829: \t-P proxyuser\tUsername for proxy authentication\n\
1.36 jakob 1830: \t-p port\t Specify local port for remote connects\n\
1.135 jmc 1831: \t-R CAfile CA bundle\n\
1.21 ericj 1832: \t-r Randomize remote ports\n\
1.67 jmc 1833: \t-S Enable the TCP MD5 signature option\n\
1.217 schwarze 1834: \t-s sourceaddr Local source address\n\
1.135 jmc 1835: \t-T keyword TOS value or TLS options\n\
1.21 ericj 1836: \t-t Answer TELNET negotiation\n\
1.67 jmc 1837: \t-U Use UNIX domain socket\n\
1.21 ericj 1838: \t-u UDP mode\n\
1.98 guenther 1839: \t-V rtable Specify alternate routing table\n\
1.21 ericj 1840: \t-v Verbose\n\
1.182 bluhm 1841: \t-W recvlimit Terminate after receiving a number of packets\n\
1.135 jmc 1842: \t-w timeout Timeout for connects and final net reads\n\
1.75 djm 1843: \t-X proto Proxy protocol: \"4\", \"5\" (SOCKS) or \"connect\"\n\
1844: \t-x addr[:port]\tSpecify proxy address and port\n\
1.180 jmc 1845: \t-Z Peer certificate file\n\
1.21 ericj 1846: \t-z Zero-I/O mode [used for scanning]\n\
1847: Port numbers can be individual or ranges: lo-hi [inclusive]\n");
1848: exit(1);
1.11 ericj 1849: }
1850:
1851: void
1.37 jakob 1852: usage(int ret)
1.11 ericj 1853: {
1.92 sobrado 1854: fprintf(stderr,
1.135 jmc 1855: "usage: nc [-46cDdFhklNnrStUuvz] [-C certfile] [-e name] "
1856: "[-H hash] [-I length]\n"
1.156 jca 1857: "\t [-i interval] [-K keyfile] [-M ttl] [-m minttl] [-O length]\n"
1.169 jmc 1858: "\t [-o staplefile] [-P proxy_username] [-p source_port] "
1859: "[-R CAfile]\n"
1.217 schwarze 1860: "\t [-s sourceaddr] [-T keyword] [-V rtable] [-W recvlimit] "
1.182 bluhm 1861: "[-w timeout]\n"
1862: "\t [-X proxy_protocol] [-x proxy_address[:port]] "
1863: "[-Z peercertfile]\n"
1864: "\t [destination] [port]\n");
1.21 ericj 1865: if (ret)
1866: exit(1);
1.7 deraadt 1867: }
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