Bug Summary

File:src/usr.bin/nc/netcat.c
Warning:line 489, column 7
Dereference of null pointer (loaded from variable 'proxy')

Annotated Source Code

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clang -cc1 -cc1 -triple amd64-unknown-openbsd7.4 -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name netcat.c -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 1 -pic-is-pie -mframe-pointer=all -relaxed-aliasing -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -target-feature +retpoline-indirect-calls -target-feature +retpoline-indirect-branches -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/usr/src/usr.bin/nc/obj -resource-dir /usr/local/llvm16/lib/clang/16 -internal-isystem /usr/local/llvm16/lib/clang/16/include -internal-externc-isystem /usr/include -O2 -fdebug-compilation-dir=/usr/src/usr.bin/nc/obj -ferror-limit 19 -fwrapv -D_RET_PROTECTOR -ret-protector -fcf-protection=branch -fno-jump-tables -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-valloc -fno-builtin-free -fno-builtin-strdup -fno-builtin-strndup -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /home/ben/Projects/scan/2024-01-11-140451-98009-1 -x c /usr/src/usr.bin/nc/netcat.c
1/* $OpenBSD: netcat.c,v 1.226 2023/08/14 08:07:27 tb Exp $ */
2/*
3 * Copyright (c) 2001 Eric Jackson <ericj@monkey.org>
4 * Copyright (c) 2015 Bob Beck. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
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.
17 *
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 */
29
30/*
31 * Re-written nc(1) for OpenBSD. Original implementation by
32 * *Hobbit* <hobbit@avian.org>.
33 */
34
35#include <sys/types.h>
36#include <sys/socket.h>
37#include <sys/uio.h>
38#include <sys/un.h>
39
40#include <netinet/in.h>
41#include <netinet/tcp.h>
42#include <netinet/ip.h>
43#include <arpa/telnet.h>
44
45#include <ctype.h>
46#include <err.h>
47#include <errno(*__errno()).h>
48#include <limits.h>
49#include <netdb.h>
50#include <poll.h>
51#include <signal.h>
52#include <stdarg.h>
53#include <stdio.h>
54#include <stdlib.h>
55#include <string.h>
56#include <time.h>
57#include <tls.h>
58#include <unistd.h>
59
60#include "atomicio.h"
61
62#define PORT_MAX65535 65535
63#define UNIX_DG_TMP_SOCKET_SIZE19 19
64
65#define POLL_STDIN0 0
66#define POLL_NETOUT1 1
67#define POLL_NETIN2 2
68#define POLL_STDOUT3 3
69#define BUFSIZE16384 16384
70
71#define TLS_NOVERIFY(1 << 1) (1 << 1)
72#define TLS_NONAME(1 << 2) (1 << 2)
73#define TLS_CCERT(1 << 3) (1 << 3)
74#define TLS_MUSTSTAPLE(1 << 4) (1 << 4)
75
76/* Command Line Options */
77int dflag; /* detached, no stdin */
78int Fflag; /* fdpass sock to stdout */
79unsigned int iflag; /* Interval Flag */
80int kflag; /* More than one connect */
81int lflag; /* Bind to local port */
82int Nflag; /* shutdown() network socket */
83int nflag; /* Don't do name look up */
84char *Pflag; /* Proxy username */
85char *pflag; /* Localport flag */
86int rflag; /* Random ports flag */
87char *sflag; /* Source Address */
88int tflag; /* Telnet Emulation */
89int uflag; /* UDP - Default to TCP */
90int vflag; /* Verbosity */
91int xflag; /* Socks proxy */
92int zflag; /* Port Scan Flag */
93int Dflag; /* sodebug */
94int Iflag; /* TCP receive buffer size */
95int Oflag; /* TCP send buffer size */
96int Sflag; /* TCP MD5 signature option */
97int Tflag = -1; /* IP Type of Service */
98int rtableid = -1;
99
100int usetls; /* use TLS */
101const char *Cflag; /* Public cert file */
102const char *Kflag; /* Private key file */
103const char *oflag; /* OCSP stapling file */
104const char *Rflag; /* Root CA file */
105int tls_cachanged; /* Using non-default CA file */
106int TLSopt; /* TLS options */
107char *tls_expectname; /* required name in peer cert */
108char *tls_expecthash; /* required hash of peer cert */
109char *tls_ciphers; /* TLS ciphers */
110char *tls_protocols; /* TLS protocols */
111FILE *Zflag; /* file to save peer cert */
112
113int recvcount, recvlimit;
114int timeout = -1;
115int family = AF_UNSPEC0;
116char *portlist[PORT_MAX65535+1];
117char *unix_dg_tmp_socket;
118int ttl = -1;
119int minttl = -1;
120
121void atelnet(int, unsigned char *, unsigned int);
122int strtoport(char *portstr, int udp);
123void build_ports(char *);
124void help(void) __attribute__((noreturn));
125int local_listen(const char *, const char *, struct addrinfo);
126void readwrite(int, struct tls *);
127void fdpass(int nfd) __attribute__((noreturn));
128int remote_connect(const char *, const char *, struct addrinfo, char *);
129int timeout_tls(int, struct tls *, int (*)(struct tls *));
130int timeout_connect(int, const struct sockaddr *, socklen_t);
131int socks_connect(const char *, const char *, struct addrinfo,
132 const char *, const char *, struct addrinfo, int, const char *);
133int udptest(int);
134void connection_info(const char *, const char *, const char *, const char *);
135int unix_bind(char *, int);
136int unix_connect(char *);
137int unix_listen(char *);
138void set_common_sockopts(int, int);
139int process_tos_opt(char *, int *);
140int process_tls_opt(char *, int *);
141void save_peer_cert(struct tls *_tls_ctx, FILE *_fp);
142void report_sock(const char *, const struct sockaddr *, socklen_t, char *);
143void report_tls(struct tls *tls_ctx, char * host);
144void usage(int);
145ssize_t drainbuf(int, unsigned char *, size_t *, struct tls *);
146ssize_t fillbuf(int, unsigned char *, size_t *, struct tls *);
147void tls_setup_client(struct tls *, int, char *);
148struct tls *tls_setup_server(struct tls *, int, char *);
149
150int
151main(int argc, char *argv[])
152{
153 int ch, s = -1, ret, socksv;
154 char *host, *uport;
155 char ipaddr[NI_MAXHOST256];
156 struct addrinfo hints;
157 socklen_t len;
158 struct sockaddr_storage cliaddr;
159 char *proxy = NULL((void *)0), *proxyport = NULL((void *)0);
1
'proxy' initialized to a null pointer value
→
160 const char *errstr;
161 struct addrinfo proxyhints;
162 char unix_dg_tmp_socket_buf[UNIX_DG_TMP_SOCKET_SIZE19];
163 struct tls_config *tls_cfg = NULL((void *)0);
164 struct tls *tls_ctx = NULL((void *)0);
165 uint32_t protocols;
166
167 ret = 1;
168 socksv = 5;
169 host = NULL((void *)0);
170 uport = NULL((void *)0);
171 Rflag = tls_default_ca_cert_file();
172
173 signal(SIGPIPE13, SIG_IGN(void (*)(int))1);
174
175 while ((ch = getopt(argc, argv,
2
←
Assuming the condition is false
→
3
←
Loop condition is false. Execution continues on line 346
→
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) {
178 switch (ch) {
179 case '4':
180 family = AF_INET2;
181 break;
182 case '6':
183 family = AF_INET624;
184 break;
185 case 'U':
186 family = AF_UNIX1;
187 break;
188 case 'X':
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");
197 break;
198 case 'C':
199 Cflag = optarg;
200 break;
201 case 'c':
202 usetls = 1;
203 break;
204 case 'd':
205 dflag = 1;
206 break;
207 case 'e':
208 tls_expectname = optarg;
209 break;
210 case 'F':
211 Fflag = 1;
212 break;
213 case 'H':
214 tls_expecthash = optarg;
215 break;
216 case 'h':
217 help();
218 break;
219 case 'i':
220 iflag = strtonum(optarg, 0, UINT_MAX0xffffffffU, &errstr);
221 if (errstr)
222 errx(1, "interval %s: %s", errstr, optarg);
223 break;
224 case 'K':
225 Kflag = optarg;
226 break;
227 case 'k':
228 kflag = 1;
229 break;
230 case 'l':
231 lflag = 1;
232 break;
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;
243 case 'N':
244 Nflag = 1;
245 break;
246 case 'n':
247 nflag = 1;
248 break;
249 case 'P':
250 Pflag = optarg;
251 break;
252 case 'p':
253 pflag = optarg;
254 break;
255 case 'R':
256 tls_cachanged = 1;
257 Rflag = optarg;
258 break;
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;
271 case 'V':
272 rtableid = (int)strtonum(optarg, 0,
273 RT_TABLEID_MAX255, &errstr);
274 if (errstr)
275 errx(1, "rtable %s: %s", errstr, optarg);
276 break;
277 case 'v':
278 vflag = 1;
279 break;
280 case 'W':
281 recvlimit = strtonum(optarg, 1, INT_MAX0x7fffffff, &errstr);
282 if (errstr)
283 errx(1, "receive limit %s: %s", errstr, optarg);
284 break;
285 case 'w':
286 timeout = strtonum(optarg, 0, INT_MAX0x7fffffff / 1000, &errstr);
287 if (errstr)
288 errx(1, "timeout %s: %s", errstr, optarg);
289 timeout *= 1000;
290 break;
291 case 'x':
292 xflag = 1;
293 if ((proxy = strdup(optarg)) == NULL((void *)0))
294 err(1, NULL((void *)0));
295 break;
296 case 'Z':
297 if (strcmp(optarg, "-") == 0)
298 Zflag = stderr(&__sF[2]);
299 else if ((Zflag = fopen(optarg, "w")) == NULL((void *)0))
300 err(1, "can't open %s", optarg);
301 break;
302 case 'z':
303 zflag = 1;
304 break;
305 case 'D':
306 Dflag = 1;
307 break;
308 case 'I':
309 Iflag = strtonum(optarg, 1, 65536 << 14, &errstr);
310 if (errstr != NULL((void *)0))
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((void *)0))
317 errx(1, "TCP send window %s: %s",
318 errstr, optarg);
319 break;
320 case 'o':
321 oflag = optarg;
322 break;
323 case 'S':
324 Sflag = 1;
325 break;
326 case 'T':
327 errstr = NULL((void *)0);
328 errno(*__errno()) = 0;
329 if (process_tls_opt(optarg, &TLSopt))
330 break;
331 if (process_tos_opt(optarg, &Tflag))
332 break;
333 if (strlen(optarg) > 1 && optarg[0] == '0' &&
334 optarg[1] == 'x')
335 Tflag = (int)strtol(optarg, NULL((void *)0), 16);
336 else
337 Tflag = (int)strtonum(optarg, 0, 255,
338 &errstr);
339 if (Tflag < 0 || Tflag > 255 || errstr || errno(*__errno()))
340 errx(1, "illegal tos/tls value %s", optarg);
341 break;
342 default:
343 usage(1);
344 }
345 }
346 argc -= optind;
347 argv += optind;
348
349 if (rtableid
3.1
'rtableid' is < 0
 >= 0)
350 if (setrtable(rtableid) == -1)
351 err(1, "setrtable");
352
353 /* Cruft to make sure options are clean, and used properly. */
354 if (argc == 1 && family == AF_UNIX1) {
4
←
Assuming 'argc' is not equal to 1
→
355 host = argv[0];
356 } else if (argc
4.1
'argc' is not equal to 1
 == 1 && lflag) {
357 uport = argv[0];
358 } else if (argc == 2) {
5
←
Assuming 'argc' is equal to 2
→
6
←
Taking true branch
→
359 host = argv[0];
360 uport = argv[1];
361 } else
362 usage(1);
363
364 if (usetls) {
7
←
Assuming 'usetls' is 0
→
365 if (Cflag && unveil(Cflag, "r") == -1)
366 err(1, "unveil %s", Cflag);
367 if (unveil(Rflag, "r") == -1)
368 err(1, "unveil %s", Rflag);
369 if (Kflag && unveil(Kflag, "r") == -1)
370 err(1, "unveil %s", Kflag);
371 if (oflag && unveil(oflag, "r") == -1)
372 err(1, "unveil %s", oflag);
373 } else if (family
7.1
'family' is not equal to AF_UNIX
 == AF_UNIX1 && 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 */
379 } else {
380 if (family
7.2
'family' is not equal to AF_UNIX
 == AF_UNIX1) {
8
←
Taking false branch
→
381 if (unveil(host, "rwc") == -1)
382 err(1, "unveil %s", host);
383 if (uflag && !kflag) {
384 if (sflag) {
385 if (unveil(sflag, "rwc") == -1)
386 err(1, "unveil %s", sflag);
387 } else {
388 if (unveil("/tmp", "rwc") == -1)
389 err(1, "unveil /tmp");
390 }
391 }
392 } else {
393 /* no filesystem visibility */
394 if (unveil("/", "") == -1)
9
←
Assuming the condition is false
→
10
←
Taking false branch
→
395 err(1, "unveil /");
396 }
397 }
398
399 if (family
10.1
'family' is not equal to AF_UNIX
 == AF_UNIX1) {
400 if (pledge("stdio rpath wpath cpath tmppath unix", NULL((void *)0)) == -1)
401 err(1, "pledge");
402 } else if (Fflag && Pflag) {
11
←
Assuming 'Fflag' is not equal to 0
→
12
←
Assuming 'Pflag' is non-null
→
13
←
Taking true branch
→
403 if (pledge("stdio inet dns sendfd tty", NULL((void *)0)) == -1)
14
←
Assuming the condition is false
→
404 err(1, "pledge");
405 } else if (Fflag) {
406 if (pledge("stdio inet dns sendfd", NULL((void *)0)) == -1)
407 err(1, "pledge");
408 } else if (Pflag && usetls) {
409 if (pledge("stdio rpath inet dns tty", NULL((void *)0)) == -1)
410 err(1, "pledge");
411 } else if (Pflag) {
412 if (pledge("stdio inet dns tty", NULL((void *)0)) == -1)
413 err(1, "pledge");
414 } else if (usetls) {
415 if (pledge("stdio rpath inet dns", NULL((void *)0)) == -1)
416 err(1, "pledge");
417 } else if (pledge("stdio inet dns", NULL((void *)0)) == -1)
418 err(1, "pledge");
419
420 if (lflag && sflag)
15
←
Assuming 'lflag' is 0
→
421 errx(1, "cannot use -s and -l");
422 if (lflag
15.1
'lflag' is 0
 && pflag)
423 errx(1, "cannot use -p and -l");
424 if (lflag
15.2
'lflag' is 0
 && zflag)
425 errx(1, "cannot use -z and -l");
426 if (!lflag
15.3
'lflag' is 0
 && kflag)
16
←
Assuming 'kflag' is 0
→
427 errx(1, "must use -l with -k");
428 if (uflag && usetls)
17
←
Assuming 'uflag' is 0
→
429 errx(1, "cannot use -c and -u");
430 if ((family
17.1
'family' is not equal to AF_UNIX
 == AF_UNIX1) && usetls)
431 errx(1, "cannot use -c and -U");
432 if ((family
17.2
'family' is not equal to AF_UNIX
 == AF_UNIX1) && Fflag)
433 errx(1, "cannot use -F and -U");
434 if (Fflag
17.3
'Fflag' is not equal to 0
 && usetls
17.4
'usetls' is 0
)
435 errx(1, "cannot use -c and -F");
436 if (TLSopt && !usetls)
18
←
Assuming 'TLSopt' is 0
→
437 errx(1, "you must specify -c to use TLS options");
438 if (Cflag && !usetls)
19
←
Assuming 'Cflag' is null
→
439 errx(1, "you must specify -c to use -C");
440 if (Kflag && !usetls)
20
←
Assuming 'Kflag' is null
→
441 errx(1, "you must specify -c to use -K");
442 if (Zflag && !usetls)
21
←
Assuming 'Zflag' is null
→
443 errx(1, "you must specify -c to use -Z");
444 if (oflag && !Cflag)
22
←
Assuming 'oflag' is null
→
445 errx(1, "you must specify -C to use -o");
446 if (tls_cachanged && !usetls)
23
←
Assuming 'tls_cachanged' is 0
→
447 errx(1, "you must specify -c to use -R");
448 if (tls_expecthash && !usetls)
24
←
Assuming 'tls_expecthash' is null
→
449 errx(1, "you must specify -c to use -H");
450 if (tls_expectname && !usetls)
25
←
Assuming 'tls_expectname' is null
→
451 errx(1, "you must specify -c to use -e");
452
453 /* Get name of temporary socket for unix datagram client */
454 if ((family
25.1
'family' is not equal to AF_UNIX
 == AF_UNIX1) && uflag && !lflag) {
455 if (sflag) {
456 unix_dg_tmp_socket = sflag;
457 } else {
458 strlcpy(unix_dg_tmp_socket_buf, "/tmp/nc.XXXXXXXXXX",
459 UNIX_DG_TMP_SOCKET_SIZE19);
460 if (mktemp(unix_dg_tmp_socket_buf) == NULL((void *)0))
461 err(1, "mktemp");
462 unix_dg_tmp_socket = unix_dg_tmp_socket_buf;
463 }
464 }
465
466 /* Initialize addrinfo structure. */
467 if (family
25.2
'family' is not equal to AF_UNIX
 != AF_UNIX1) {
26
←
Taking true branch
→
468 memset(&hints, 0, sizeof(struct addrinfo));
469 hints.ai_family = family;
470 hints.ai_socktype = uflag
26.1
'uflag' is 0
 ? SOCK_DGRAM2 : SOCK_STREAM1;
27
←
'?' condition is false
→
471 hints.ai_protocol = uflag
27.1
'uflag' is 0
 ? IPPROTO_UDP17 : IPPROTO_TCP6;
28
←
'?' condition is false
→
472 if (nflag)
29
←
Assuming 'nflag' is 0
→
30
←
Taking false branch
→
473 hints.ai_flags |= AI_NUMERICHOST4;
474 }
475
476 if (xflag) {
31
←
Assuming 'xflag' is not equal to 0
→
32
←
Taking true branch
→
477 if (uflag
32.1
'uflag' is 0
)
33
←
Taking false branch
→
478 errx(1, "no proxy support for UDP mode");
479
480 if (lflag
33.1
'lflag' is 0
)
34
←
Taking false branch
→
481 errx(1, "no proxy support for listen");
482
483 if (family == AF_UNIX1)
35
←
Assuming 'family' is not equal to AF_UNIX
→
36
←
Taking false branch
→
484 errx(1, "no proxy support for unix sockets");
485
486 if (sflag)
37
←
Assuming 'sflag' is null
→
38
←
Taking false branch
→
487 errx(1, "no proxy support for local source address");
488
489 if (*proxy == '[') {
39
←
Dereference of null pointer (loaded from variable 'proxy')
490 ++proxy;
491 proxyport = strchr(proxy, ']');
492 if (proxyport == NULL((void *)0))
493 errx(1, "missing closing bracket in proxy");
494 *proxyport++ = '\0';
495 if (*proxyport == '\0')
496 /* Use default proxy port. */
497 proxyport = NULL((void *)0);
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((void *)0))
507 *proxyport++ = '\0';
508 }
509
510 memset(&proxyhints, 0, sizeof(struct addrinfo));
511 proxyhints.ai_family = family;
512 proxyhints.ai_socktype = SOCK_STREAM1;
513 proxyhints.ai_protocol = IPPROTO_TCP6;
514 if (nflag)
515 proxyhints.ai_flags |= AI_NUMERICHOST4;
516 }
517
518 if (usetls) {
519 if ((tls_cfg = tls_config_new()) == NULL((void *)0))
520 errx(1, "unable to allocate TLS config");
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)
526 errx(1, "%s", tls_config_error(tls_cfg));
527 if (oflag && tls_config_set_ocsp_staple_file(tls_cfg, oflag) == -1)
528 errx(1, "%s", tls_config_error(tls_cfg));
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));
535 if (!lflag && (TLSopt & TLS_CCERT(1 << 3)))
536 errx(1, "clientcert is only valid with -l");
537 if (TLSopt & TLS_NONAME(1 << 2))
538 tls_config_insecure_noverifyname(tls_cfg);
539 if (TLSopt & TLS_NOVERIFY(1 << 1)) {
540 if (tls_expecthash != NULL((void *)0))
541 errx(1, "-H and -T noverify may not be used "
542 "together");
543 tls_config_insecure_noverifycert(tls_cfg);
544 }
545 if (TLSopt & TLS_MUSTSTAPLE(1 << 4))
546 tls_config_ocsp_require_stapling(tls_cfg);
547
548 if (Pflag) {
549 if (pledge("stdio inet dns tty", NULL((void *)0)) == -1)
550 err(1, "pledge");
551 } else if (pledge("stdio inet dns", NULL((void *)0)) == -1)
552 err(1, "pledge");
553 }
554 if (lflag) {
555 ret = 0;
556
557 if (family == AF_UNIX1) {
558 if (uflag)
559 s = unix_bind(host, 0);
560 else
561 s = unix_listen(host);
562 }
563
564 if (usetls) {
565 tls_config_verify_client_optional(tls_cfg);
566 if ((tls_ctx = tls_server()) == NULL((void *)0))
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 }
572 /* Allow only one connection at a time, but stay alive. */
573 for (;;) {
574 if (family != AF_UNIX1) {
575 if (s != -1)
576 close(s);
577 s = local_listen(host, uport, hints);
578 }
579 if (s == -1)
580 err(1, NULL((void *)0));
581 if (uflag && kflag) {
582 if (family == AF_UNIX1) {
583 if (pledge("stdio unix", NULL((void *)0)) == -1)
584 err(1, "pledge");
585 }
586 /*
587 * For UDP and -k, don't connect the socket,
588 * let it receive datagrams from multiple
589 * socket pairs.
590 */
591 readwrite(s, NULL((void *)0));
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 */
598 int rv;
599 char buf[2048];
600 struct sockaddr_storage z;
601
602 len = sizeof(z);
603 rv = recvfrom(s, buf, sizeof(buf), MSG_PEEK0x2,
604 (struct sockaddr *)&z, &len);
605 if (rv == -1)
606 err(1, "recvfrom");
607
608 rv = connect(s, (struct sockaddr *)&z, len);
609 if (rv == -1)
610 err(1, "connect");
611
612 if (family == AF_UNIX1) {
613 if (pledge("stdio unix", NULL((void *)0)) == -1)
614 err(1, "pledge");
615 }
616 if (vflag)
617 report_sock("Connection received",
618 (struct sockaddr *)&z, len,
619 family == AF_UNIX1 ? host : NULL((void *)0));
620
621 readwrite(s, NULL((void *)0));
622 } else {
623 struct tls *tls_cctx = NULL((void *)0);
624 int connfd;
625
626 len = sizeof(cliaddr);
627 connfd = accept4(s, (struct sockaddr *)&cliaddr,
628 &len, SOCK_NONBLOCK0x4000);
629 if (connfd == -1) {
630 /* For now, all errnos are fatal */
631 err(1, "accept");
632 }
633 if (vflag)
634 report_sock("Connection received",
635 (struct sockaddr *)&cliaddr, len,
636 family == AF_UNIX1 ? host : NULL((void *)0));
637 if ((usetls) &&
638 (tls_cctx = tls_setup_server(tls_ctx, connfd, host)))
639 readwrite(connfd, tls_cctx);
640 if (!usetls)
641 readwrite(connfd, NULL((void *)0));
642 if (tls_cctx)
643 timeout_tls(s, tls_cctx, tls_close);
644 close(connfd);
645 tls_free(tls_cctx);
646 }
647 if (family == AF_UNIX1 && uflag) {
648 if (connect(s, NULL((void *)0), 0) == -1)
649 err(1, "connect");
650 }
651
652 if (!kflag)
653 break;
654 }
655 } else if (family == AF_UNIX1) {
656 ret = 0;
657
658 if ((s = unix_connect(host)) > 0) {
659 if (!zflag)
660 readwrite(s, NULL((void *)0));
661 close(s);
662 } else {
663 warn("%s", host);
664 ret = 1;
665 }
666
667 if (uflag)
668 unlink(unix_dg_tmp_socket);
669 return ret;
670 } else {
671 int i = 0;
672
673 /* Construct the portlist[] array. */
674 build_ports(uport);
675
676 /* Cycle through portlist, connecting to each port. */
677 for (s = -1, i = 0; portlist[i] != NULL((void *)0); i++) {
678 if (s != -1)
679 close(s);
680 tls_free(tls_ctx);
681 tls_ctx = NULL((void *)0);
682
683 if (usetls) {
684 if ((tls_ctx = tls_client()) == NULL((void *)0))
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 }
690 if (xflag)
691 s = socks_connect(host, portlist[i], hints,
692 proxy, proxyport, proxyhints, socksv,
693 Pflag);
694 else
695 s = remote_connect(host, portlist[i], hints,
696 ipaddr);
697
698 if (s == -1)
699 continue;
700
701 ret = 0;
702 if (vflag || zflag) {
703 int print_info = 1;
704
705 /* For UDP, make sure we are connected. */
706 if (uflag) {
707 /* No info on failed or skipped test. */
708 if ((print_info = udptest(s)) == -1) {
709 ret = 1;
710 continue;
711 }
712 }
713 if (print_info == 1)
714 connection_info(host, portlist[i],
715 uflag ? "udp" : "tcp", ipaddr);
716 }
717 if (Fflag)
718 fdpass(s);
719 else {
720 if (usetls)
721 tls_setup_client(tls_ctx, s, host);
722 if (!zflag)
723 readwrite(s, tls_ctx);
724 if (tls_ctx)
725 timeout_tls(s, tls_ctx, tls_close);
726 }
727 }
728 }
729
730 if (s != -1)
731 close(s);
732 tls_free(tls_ctx);
733 tls_config_free(tls_cfg);
734
735 return ret;
736}
737
738/*
739 * unix_bind()
740 * Returns a unix socket bound to the given path
741 */
742int
743unix_bind(char *path, int flags)
744{
745 struct sockaddr_un s_un;
746 int s, save_errno;
747
748 /* Create unix domain socket. */
749 if ((s = socket(AF_UNIX1, flags | (uflag ? SOCK_DGRAM2 : SOCK_STREAM1),
750 0)) == -1)
751 return -1;
752
753 memset(&s_un, 0, sizeof(struct sockaddr_un));
754 s_un.sun_family = AF_UNIX1;
755
756 if (strlcpy(s_un.sun_path, path, sizeof(s_un.sun_path)) >=
757 sizeof(s_un.sun_path)) {
758 close(s);
759 errno(*__errno()) = ENAMETOOLONG63;
760 return -1;
761 }
762
763 if (bind(s, (struct sockaddr *)&s_un, sizeof(s_un)) == -1) {
764 save_errno = errno(*__errno());
765 close(s);
766 errno(*__errno()) = save_errno;
767 return -1;
768 }
769 if (vflag)
770 report_sock("Bound", NULL((void *)0), 0, path);
771
772 return s;
773}
774
775int
776timeout_tls(int s, struct tls *tls_ctx, int (*func)(struct tls *))
777{
778 struct pollfd pfd;
779 int ret;
780
781 while ((ret = (*func)(tls_ctx)) != 0) {
782 if (ret == TLS_WANT_POLLIN-2)
783 pfd.events = POLLIN0x0001;
784 else if (ret == TLS_WANT_POLLOUT-3)
785 pfd.events = POLLOUT0x0004;
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(*__errno()) = ETIMEDOUT60;
793 ret = -1;
794 break;
795 } else
796 err(1, "poll failed");
797 }
798
799 return ret;
800}
801
802void
803tls_setup_client(struct tls *tls_ctx, int s, char *host)
804{
805 const char *errstr;
806
807 if (tls_connect_socket(tls_ctx, s,
808 tls_expectname ? tls_expectname : host) == -1) {
809 errx(1, "tls connection failed (%s)",
810 tls_error(tls_ctx));
811 }
812 if (timeout_tls(s, tls_ctx, tls_handshake) == -1) {
813 if ((errstr = tls_error(tls_ctx)) == NULL((void *)0))
814 errstr = strerror(errno(*__errno()));
815 errx(1, "tls handshake failed (%s)", errstr);
816 }
817 if (vflag)
818 report_tls(tls_ctx, host);
819 if (tls_expecthash && (tls_peer_cert_hash(tls_ctx) == NULL((void *)0) ||
820 strcmp(tls_expecthash, tls_peer_cert_hash(tls_ctx)) != 0))
821 errx(1, "peer certificate is not %s", tls_expecthash);
822 if (Zflag) {
823 save_peer_cert(tls_ctx, Zflag);
824 if (Zflag != stderr(&__sF[2]) && (fclose(Zflag) != 0))
825 err(1, "fclose failed saving peer cert");
826 }
827}
828
829struct tls *
830tls_setup_server(struct tls *tls_ctx, int connfd, char *host)
831{
832 struct tls *tls_cctx;
833 const char *errstr;
834
835 if (tls_accept_socket(tls_ctx, &tls_cctx, connfd) == -1) {
836 warnx("tls accept failed (%s)", tls_error(tls_ctx));
837 } else if (timeout_tls(connfd, tls_cctx, tls_handshake) == -1) {
838 if ((errstr = tls_error(tls_cctx)) == NULL((void *)0))
839 errstr = strerror(errno(*__errno()));
840 warnx("tls handshake failed (%s)", errstr);
841 } else {
842 int gotcert = tls_peer_cert_provided(tls_cctx);
843
844 if (vflag && gotcert)
845 report_tls(tls_cctx, host);
846 if ((TLSopt & TLS_CCERT(1 << 3)) && !gotcert)
847 warnx("No client certificate provided");
848 else if (gotcert && tls_expecthash &&
849 (tls_peer_cert_hash(tls_cctx) == NULL((void *)0) ||
850 strcmp(tls_expecthash, tls_peer_cert_hash(tls_cctx)) != 0))
851 warnx("peer certificate is not %s", tls_expecthash);
852 else if (gotcert && tls_expectname &&
853 (!tls_peer_cert_contains_name(tls_cctx, tls_expectname)))
854 warnx("name (%s) not found in client cert",
855 tls_expectname);
856 else {
857 return tls_cctx;
858 }
859 }
860 return NULL((void *)0);
861}
862
863/*
864 * unix_connect()
865 * Returns a socket connected to a local unix socket. Returns -1 on failure.
866 */
867int
868unix_connect(char *path)
869{
870 struct sockaddr_un s_un;
871 int s, save_errno;
872
873 if (uflag) {
874 if ((s = unix_bind(unix_dg_tmp_socket, SOCK_CLOEXEC0x8000)) == -1)
875 return -1;
876 } else {
877 if ((s = socket(AF_UNIX1, SOCK_STREAM1 | SOCK_CLOEXEC0x8000, 0)) == -1)
878 return -1;
879 }
880
881 memset(&s_un, 0, sizeof(struct sockaddr_un));
882 s_un.sun_family = AF_UNIX1;
883
884 if (strlcpy(s_un.sun_path, path, sizeof(s_un.sun_path)) >=
885 sizeof(s_un.sun_path)) {
886 close(s);
887 errno(*__errno()) = ENAMETOOLONG63;
888 return -1;
889 }
890 if (connect(s, (struct sockaddr *)&s_un, sizeof(s_un)) == -1) {
891 save_errno = errno(*__errno());
892 close(s);
893 errno(*__errno()) = save_errno;
894 return -1;
895 }
896 return s;
897}
898
899/*
900 * unix_listen()
901 * Create a unix domain socket, and listen on it.
902 */
903int
904unix_listen(char *path)
905{
906 int s;
907
908 if ((s = unix_bind(path, 0)) == -1)
909 return -1;
910 if (listen(s, 5) == -1) {
911 close(s);
912 return -1;
913 }
914 if (vflag)
915 report_sock("Listening", NULL((void *)0), 0, path);
916
917 return s;
918}
919
920/*
921 * remote_connect()
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.
924 */
925int
926remote_connect(const char *host, const char *port, struct addrinfo hints,
927 char *ipaddr)
928{
929 struct addrinfo *res, *res0;
930 int s = -1, error, herr, on = 1, save_errno;
931
932 if ((error = getaddrinfo(host, port, &hints, &res0)))
933 errx(1, "getaddrinfo for host \"%s\" port %s: %s", host,
934 port, gai_strerror(error));
935
936 for (res = res0; res; res = res->ai_next) {
937 if ((s = socket(res->ai_family, res->ai_socktype |
938 SOCK_NONBLOCK0x4000, res->ai_protocol)) == -1)
939 continue;
940
941 /* Bind to a local port or source address if specified. */
942 if (sflag || pflag) {
943 struct addrinfo ahints, *ares;
944
945 /* try SO_BINDANY, but don't insist */
946 setsockopt(s, SOL_SOCKET0xffff, SO_BINDANY0x1000, &on, sizeof(on));
947 memset(&ahints, 0, sizeof(struct addrinfo));
948 ahints.ai_family = res->ai_family;
949 ahints.ai_socktype = uflag ? SOCK_DGRAM2 : SOCK_STREAM1;
950 ahints.ai_protocol = uflag ? IPPROTO_UDP17 : IPPROTO_TCP6;
951 ahints.ai_flags = AI_PASSIVE1;
952 if ((error = getaddrinfo(sflag, pflag, &ahints, &ares)))
953 errx(1, "getaddrinfo: %s", gai_strerror(error));
954
955 if (bind(s, (struct sockaddr *)ares->ai_addr,
956 ares->ai_addrlen) == -1)
957 err(1, "bind failed");
958 freeaddrinfo(ares);
959 }
960
961 set_common_sockopts(s, res->ai_family);
962
963 if (ipaddr != NULL((void *)0)) {
964 herr = getnameinfo(res->ai_addr, res->ai_addrlen,
965 ipaddr, NI_MAXHOST256, NULL((void *)0), 0, NI_NUMERICHOST1);
966 switch (herr) {
967 case 0:
968 break;
969 case EAI_SYSTEM-11:
970 err(1, "getnameinfo");
971 default:
972 errx(1, "getnameinfo: %s", gai_strerror(herr));
973 }
974 }
975
976 if (timeout_connect(s, res->ai_addr, res->ai_addrlen) == 0)
977 break;
978
979 if (vflag) {
980 /* only print IP if there is something to report */
981 if (nflag || ipaddr == NULL((void *)0) ||
982 (strncmp(host, ipaddr, NI_MAXHOST256) == 0))
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 }
989
990 save_errno = errno(*__errno());
991 close(s);
992 errno(*__errno()) = save_errno;
993 s = -1;
994 }
995
996 freeaddrinfo(res0);
997
998 return s;
999}
1000
1001int
1002timeout_connect(int s, const struct sockaddr *name, socklen_t namelen)
1003{
1004 struct pollfd pfd;
1005 socklen_t optlen;
1006 int optval;
1007 int ret;
1008
1009 if ((ret = connect(s, name, namelen)) != 0 && errno(*__errno()) == EINPROGRESS36) {
1010 pfd.fd = s;
1011 pfd.events = POLLOUT0x0004;
1012 if ((ret = poll(&pfd, 1, timeout)) == 1) {
1013 optlen = sizeof(optval);
1014 if ((ret = getsockopt(s, SOL_SOCKET0xffff, SO_ERROR0x1007,
1015 &optval, &optlen)) == 0) {
1016 errno(*__errno()) = optval;
1017 ret = optval == 0 ? 0 : -1;
1018 }
1019 } else if (ret == 0) {
1020 errno(*__errno()) = ETIMEDOUT60;
1021 ret = -1;
1022 } else
1023 err(1, "poll failed");
1024 }
1025
1026 return ret;
1027}
1028
1029/*
1030 * local_listen()
1031 * Returns a socket listening on a local port, binds to specified source
1032 * address. Returns -1 on failure.
1033 */
1034int
1035local_listen(const char *host, const char *port, struct addrinfo hints)
1036{
1037 struct addrinfo *res, *res0;
1038 int s = -1, ret, x = 1, save_errno;
1039 int error;
1040
1041 /* Allow nodename to be null. */
1042 hints.ai_flags |= AI_PASSIVE1;
1043
1044 /*
1045 * In the case of binding to a wildcard address
1046 * default to binding to an ipv4 address.
1047 */
1048 if (host == NULL((void *)0) && hints.ai_family == AF_UNSPEC0)
1049 hints.ai_family = AF_INET2;
1050
1051 if ((error = getaddrinfo(host, port, &hints, &res0)))
1052 errx(1, "getaddrinfo: %s", gai_strerror(error));
1053
1054 for (res = res0; res; res = res->ai_next) {
1055 if ((s = socket(res->ai_family, res->ai_socktype,
1056 res->ai_protocol)) == -1)
1057 continue;
1058
1059 ret = setsockopt(s, SOL_SOCKET0xffff, SO_REUSEPORT0x0200, &x, sizeof(x));
1060 if (ret == -1)
1061 err(1, NULL((void *)0));
1062
1063 set_common_sockopts(s, res->ai_family);
1064
1065 if (bind(s, (struct sockaddr *)res->ai_addr,
1066 res->ai_addrlen) == 0)
1067 break;
1068
1069 save_errno = errno(*__errno());
1070 close(s);
1071 errno(*__errno()) = save_errno;
1072 s = -1;
1073 }
1074
1075 if (!uflag && s != -1) {
1076 if (listen(s, 1) == -1)
1077 err(1, "listen");
1078 }
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((void *)0));
1088 }
1089
1090 freeaddrinfo(res0);
1091
1092 return s;
1093}
1094
1095/*
1096 * readwrite()
1097 * Loop that polls on the network file descriptor and stdin.
1098 */
1099void
1100readwrite(int net_fd, struct tls *tls_ctx)
1101{
1102 struct pollfd pfd[4];
1103 int stdin_fd = STDIN_FILENO0;
1104 int stdout_fd = STDOUT_FILENO1;
1105 unsigned char netinbuf[BUFSIZE16384];
1106 size_t netinbufpos = 0;
1107 unsigned char stdinbuf[BUFSIZE16384];
1108 size_t stdinbufpos = 0;
1109 int n, num_fds;
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_STDIN0].fd = stdin_fd;
1118 pfd[POLL_STDIN0].events = POLLIN0x0001;
1119
1120 /* network out */
1121 pfd[POLL_NETOUT1].fd = net_fd;
1122 pfd[POLL_NETOUT1].events = 0;
1123
1124 /* network in */
1125 pfd[POLL_NETIN2].fd = net_fd;
1126 pfd[POLL_NETIN2].events = POLLIN0x0001;
1127
1128 /* stdout */
1129 pfd[POLL_STDOUT3].fd = stdout_fd;
1130 pfd[POLL_STDOUT3].events = 0;
1131
1132 while (1) {
1133 /* both inputs are gone, buffers are empty, we are done */
1134 if (pfd[POLL_STDIN0].fd == -1 && pfd[POLL_NETIN2].fd == -1 &&
1135 stdinbufpos == 0 && netinbufpos == 0)
1136 return;
1137 /* both outputs are gone, we can't continue */
1138 if (pfd[POLL_NETOUT1].fd == -1 && pfd[POLL_STDOUT3].fd == -1)
1139 return;
1140 /* listen and net in gone, queues empty, done */
1141 if (lflag && pfd[POLL_NETIN2].fd == -1 &&
1142 stdinbufpos == 0 && netinbufpos == 0)
1143 return;
1144
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 */
1148 if (iflag)
1149 sleep(iflag);
1150
1151 /* poll */
1152 num_fds = poll(pfd, 4, timeout);
1153
1154 /* treat poll errors */
1155 if (num_fds == -1)
1156 err(1, "polling error");
1157
1158 /* timeout happened */
1159 if (num_fds == 0)
1160 return;
1161
1162 /* treat socket error conditions */
1163 for (n = 0; n < 4; n++) {
1164 if (pfd[n].revents & (POLLERR0x0008|POLLNVAL0x0020)) {
1165 pfd[n].fd = -1;
1166 }
1167 }
1168 /* reading is possible after HUP */
1169 if (pfd[POLL_STDIN0].events & POLLIN0x0001 &&
1170 pfd[POLL_STDIN0].revents & POLLHUP0x0010 &&
1171 !(pfd[POLL_STDIN0].revents & POLLIN0x0001))
1172 pfd[POLL_STDIN0].fd = -1;
1173
1174 if (pfd[POLL_NETIN2].events & POLLIN0x0001 &&
1175 pfd[POLL_NETIN2].revents & POLLHUP0x0010 &&
1176 !(pfd[POLL_NETIN2].revents & POLLIN0x0001))
1177 pfd[POLL_NETIN2].fd = -1;
1178
1179 if (pfd[POLL_NETOUT1].revents & POLLHUP0x0010) {
1180 if (pfd[POLL_NETOUT1].fd != -1 && Nflag)
1181 shutdown(pfd[POLL_NETOUT1].fd, SHUT_WR1);
1182 pfd[POLL_NETOUT1].fd = -1;
1183 }
1184 /* if HUP, stop watching stdout */
1185 if (pfd[POLL_STDOUT3].revents & POLLHUP0x0010)
1186 pfd[POLL_STDOUT3].fd = -1;
1187 /* if no net out, stop watching stdin */
1188 if (pfd[POLL_NETOUT1].fd == -1)
1189 pfd[POLL_STDIN0].fd = -1;
1190 /* if no stdout, stop watching net in */
1191 if (pfd[POLL_STDOUT3].fd == -1) {
1192 if (pfd[POLL_NETIN2].fd != -1)
1193 shutdown(pfd[POLL_NETIN2].fd, SHUT_RD0);
1194 pfd[POLL_NETIN2].fd = -1;
1195 }
1196
1197 /* try to read from stdin */
1198 if (pfd[POLL_STDIN0].revents & POLLIN0x0001 && stdinbufpos < BUFSIZE16384) {
1199 ret = fillbuf(pfd[POLL_STDIN0].fd, stdinbuf,
1200 &stdinbufpos, NULL((void *)0));
1201 if (ret == TLS_WANT_POLLIN-2)
1202 pfd[POLL_STDIN0].events = POLLIN0x0001;
1203 else if (ret == TLS_WANT_POLLOUT-3)
1204 pfd[POLL_STDIN0].events = POLLOUT0x0004;
1205 else if (ret == 0 || ret == -1)
1206 pfd[POLL_STDIN0].fd = -1;
1207 /* read something - poll net out */
1208 if (stdinbufpos > 0)
1209 pfd[POLL_NETOUT1].events = POLLOUT0x0004;
1210 /* filled buffer - remove self from polling */
1211 if (stdinbufpos == BUFSIZE16384)
1212 pfd[POLL_STDIN0].events = 0;
1213 }
1214 /* try to write to network */
1215 if (pfd[POLL_NETOUT1].revents & POLLOUT0x0004 && stdinbufpos > 0) {
1216 ret = drainbuf(pfd[POLL_NETOUT1].fd, stdinbuf,
1217 &stdinbufpos, tls_ctx);
1218 if (ret == TLS_WANT_POLLIN-2)
1219 pfd[POLL_NETOUT1].events = POLLIN0x0001;
1220 else if (ret == TLS_WANT_POLLOUT-3)
1221 pfd[POLL_NETOUT1].events = POLLOUT0x0004;
1222 else if (ret == -1)
1223 pfd[POLL_NETOUT1].fd = -1;
1224 /* buffer empty - remove self from polling */
1225 if (stdinbufpos == 0)
1226 pfd[POLL_NETOUT1].events = 0;
1227 /* buffer no longer full - poll stdin again */
1228 if (stdinbufpos < BUFSIZE16384)
1229 pfd[POLL_STDIN0].events = POLLIN0x0001;
1230 }
1231 /* try to read from network */
1232 if (pfd[POLL_NETIN2].revents & POLLIN0x0001 && netinbufpos < BUFSIZE16384) {
1233 ret = fillbuf(pfd[POLL_NETIN2].fd, netinbuf,
1234 &netinbufpos, tls_ctx);
1235 if (ret == TLS_WANT_POLLIN-2)
1236 pfd[POLL_NETIN2].events = POLLIN0x0001;
1237 else if (ret == TLS_WANT_POLLOUT-3)
1238 pfd[POLL_NETIN2].events = POLLOUT0x0004;
1239 else if (ret == -1)
1240 pfd[POLL_NETIN2].fd = -1;
1241 /* eof on net in - remove from pfd */
1242 if (ret == 0) {
1243 shutdown(pfd[POLL_NETIN2].fd, SHUT_RD0);
1244 pfd[POLL_NETIN2].fd = -1;
1245 }
1246 if (recvlimit > 0 && ++recvcount >= recvlimit) {
1247 if (pfd[POLL_NETIN2].fd != -1)
1248 shutdown(pfd[POLL_NETIN2].fd, SHUT_RD0);
1249 pfd[POLL_NETIN2].fd = -1;
1250 pfd[POLL_STDIN0].fd = -1;
1251 }
1252 /* read something - poll stdout */
1253 if (netinbufpos > 0)
1254 pfd[POLL_STDOUT3].events = POLLOUT0x0004;
1255 /* filled buffer - remove self from polling */
1256 if (netinbufpos == BUFSIZE16384)
1257 pfd[POLL_NETIN2].events = 0;
1258 /* handle telnet */
1259 if (pfd[POLL_NETIN2].fd != -1 && tflag)
1260 atelnet(pfd[POLL_NETIN2].fd, netinbuf,
1261 netinbufpos);
1262 }
1263 /* try to write to stdout */
1264 if (pfd[POLL_STDOUT3].revents & POLLOUT0x0004 && netinbufpos > 0) {
1265 ret = drainbuf(pfd[POLL_STDOUT3].fd, netinbuf,
1266 &netinbufpos, NULL((void *)0));
1267 if (ret == TLS_WANT_POLLIN-2)
1268 pfd[POLL_STDOUT3].events = POLLIN0x0001;
1269 else if (ret == TLS_WANT_POLLOUT-3)
1270 pfd[POLL_STDOUT3].events = POLLOUT0x0004;
1271 else if (ret == -1)
1272 pfd[POLL_STDOUT3].fd = -1;
1273 /* buffer empty - remove self from polling */
1274 if (netinbufpos == 0)
1275 pfd[POLL_STDOUT3].events = 0;
1276 /* buffer no longer full - poll net in again */
1277 if (netinbufpos < BUFSIZE16384)
1278 pfd[POLL_NETIN2].events = POLLIN0x0001;
1279 }
1280
1281 /* stdin gone and queue empty? */
1282 if (pfd[POLL_STDIN0].fd == -1 && stdinbufpos == 0) {
1283 if (pfd[POLL_NETOUT1].fd != -1 && Nflag)
1284 shutdown(pfd[POLL_NETOUT1].fd, SHUT_WR1);
1285 pfd[POLL_NETOUT1].fd = -1;
1286 }
1287 /* net in gone and queue empty? */
1288 if (pfd[POLL_NETIN2].fd == -1 && netinbufpos == 0) {
1289 pfd[POLL_STDOUT3].fd = -1;
1290 }
1291 }
1292}
1293
1294ssize_t
1295drainbuf(int fd, unsigned char *buf, size_t *bufpos, struct tls *tls)
1296{
1297 ssize_t n;
1298 ssize_t adjust;
1299
1300 if (fd == -1)
1301 return -1;
1302
1303 if (tls) {
1304 n = tls_write(tls, buf, *bufpos);
1305 if (n == -1)
1306 errx(1, "tls write failed (%s)", tls_error(tls));
1307 } else {
1308 n = write(fd, buf, *bufpos);
1309 /* don't treat EAGAIN, EINTR as error */
1310 if (n == -1 && (errno(*__errno()) == EAGAIN35 || errno(*__errno()) == EINTR4))
1311 n = TLS_WANT_POLLOUT-3;
1312 }
1313 if (n <= 0)
1314 return n;
1315 /* adjust buffer */
1316 adjust = *bufpos - n;
1317 if (adjust > 0)
1318 memmove(buf, buf + n, adjust);
1319 *bufpos -= n;
1320 return n;
1321}
1322
1323ssize_t
1324fillbuf(int fd, unsigned char *buf, size_t *bufpos, struct tls *tls)
1325{
1326 size_t num = BUFSIZE16384 - *bufpos;
1327 ssize_t n;
1328
1329 if (fd == -1)
1330 return -1;
1331
1332 if (tls) {
1333 n = tls_read(tls, buf + *bufpos, num);
1334 if (n == -1)
1335 errx(1, "tls read failed (%s)", tls_error(tls));
1336 } else {
1337 n = read(fd, buf + *bufpos, num);
1338 /* don't treat EAGAIN, EINTR as error */
1339 if (n == -1 && (errno(*__errno()) == EAGAIN35 || errno(*__errno()) == EINTR4))
1340 n = TLS_WANT_POLLIN-2;
1341 }
1342 if (n <= 0)
1343 return n;
1344 *bufpos += n;
1345 return n;
1346}
1347
1348/*
1349 * fdpass()
1350 * Pass the connected file descriptor to stdout and exit.
1351 */
1352void
1353fdpass(int nfd)
1354{
1355 struct msghdr mh;
1356 union {
1357 struct cmsghdr hdr;
1358 char buf[CMSG_SPACE(sizeof(int))((((unsigned long)(sizeof(struct cmsghdr)) + (sizeof(long) - 1
)) &~(sizeof(long) - 1)) + (((unsigned long)(sizeof(int))
+ (sizeof(long) - 1)) &~(sizeof(long) - 1)))];
1359 } cmsgbuf;
1360 struct cmsghdr *cmsg;
1361 struct iovec iov;
1362 char c = '\0';
1363 ssize_t r;
1364 struct pollfd pfd;
1365
1366 /* Avoid obvious stupidity */
1367 if (isatty(STDOUT_FILENO1))
1368 errx(1, "Cannot pass file descriptor to tty");
1369
1370 memset(&mh, 0, sizeof(mh));
1371 memset(&cmsgbuf, 0, sizeof(cmsgbuf));
1372 memset(&iov, 0, sizeof(iov));
1373
1374 mh.msg_control = (caddr_t)&cmsgbuf.buf;
1375 mh.msg_controllen = sizeof(cmsgbuf.buf);
1376 cmsg = CMSG_FIRSTHDR(&mh)((&mh)->msg_controllen >= sizeof(struct cmsghdr) ? (
struct cmsghdr *)(&mh)->msg_control : (struct cmsghdr *
)((void *)0));
1377 cmsg->cmsg_len = CMSG_LEN(sizeof(int))((((unsigned long)(sizeof(struct cmsghdr)) + (sizeof(long) - 1
)) &~(sizeof(long) - 1)) + (sizeof(int)));
1378 cmsg->cmsg_level = SOL_SOCKET0xffff;
1379 cmsg->cmsg_type = SCM_RIGHTS0x01;
1380 *(int *)CMSG_DATA(cmsg)((unsigned char *)(cmsg) + (((unsigned long)(sizeof(struct cmsghdr
)) + (sizeof(long) - 1)) &~(sizeof(long) - 1))) = nfd;
1381
1382 iov.iov_base = &c;
1383 iov.iov_len = 1;
1384 mh.msg_iov = &iov;
1385 mh.msg_iovlen = 1;
1386
1387 memset(&pfd, 0, sizeof(pfd));
1388 pfd.fd = STDOUT_FILENO1;
1389 pfd.events = POLLOUT0x0004;
1390 for (;;) {
1391 r = sendmsg(STDOUT_FILENO1, &mh, 0);
1392 if (r == -1) {
1393 if (errno(*__errno()) == EAGAIN35 || errno(*__errno()) == EINTR4) {
1394 if (poll(&pfd, 1, -1) == -1)
1395 err(1, "poll");
1396 continue;
1397 }
1398 err(1, "sendmsg");
1399 } else if (r != 1)
1400 errx(1, "sendmsg: unexpected return value %zd", r);
1401 else
1402 break;
1403 }
1404 exit(0);
1405}
1406
1407/* Deal with RFC 854 WILL/WONT DO/DONT negotiation. */
1408void
1409atelnet(int nfd, unsigned char *buf, unsigned int size)
1410{
1411 unsigned char *p, *end;
1412 unsigned char obuf[4];
1413
1414 if (size < 3)
1415 return;
1416 end = buf + size - 2;
1417
1418 for (p = buf; p < end; p++) {
1419 if (*p != IAC255)
1420 continue;
1421
1422 obuf[0] = IAC255;
1423 p++;
1424 if ((*p == WILL251) || (*p == WONT252))
1425 obuf[1] = DONT254;
1426 else if ((*p == DO253) || (*p == DONT254))
1427 obuf[1] = WONT252;
1428 else
1429 continue;
1430
1431 p++;
1432 obuf[2] = *p;
1433 if (atomicio(vwrite(ssize_t (*)(int, void *, size_t))write, nfd, obuf, 3) != 3)
1434 warn("Write Error!");
1435 }
1436}
1437
1438int
1439strtoport(char *portstr, int udp)
1440{
1441 struct servent *entry;
1442 const char *errstr;
1443 char *proto;
1444 int port = -1;
1445
1446 proto = udp ? "udp" : "tcp";
1447
1448 port = strtonum(portstr, 1, PORT_MAX65535, &errstr);
1449 if (errstr == NULL((void *)0))
1450 return port;
1451 if (errno(*__errno()) != EINVAL22)
1452 errx(1, "port number %s: %s", errstr, portstr);
1453 if ((entry = getservbyname(portstr, proto)) == NULL((void *)0))
1454 errx(1, "service \"%s\" unknown", portstr);
1455 return ntohs(entry->s_port)(__uint16_t)(__builtin_constant_p(entry->s_port) ? (__uint16_t
)(((__uint16_t)(entry->s_port) & 0xffU) << 8 | (
(__uint16_t)(entry->s_port) & 0xff00U) >> 8) : __swap16md
(entry->s_port));
1456}
1457
1458/*
1459 * build_ports()
1460 * Build an array of ports in portlist[], listing each port
1461 * that we should try to connect to.
1462 */
1463void
1464build_ports(char *p)
1465{
1466 char *n;
1467 int hi, lo, cp;
1468 int x = 0;
1469
1470 if (isdigit((unsigned char)*p) && (n = strchr(p, '-')) != NULL((void *)0)) {
1471 *n = '\0';
1472 n++;
1473
1474 /* Make sure the ports are in order: lowest->highest. */
1475 hi = strtoport(n, uflag);
1476 lo = strtoport(p, uflag);
1477 if (lo > hi) {
1478 cp = hi;
1479 hi = lo;
1480 lo = cp;
1481 }
1482
1483 /*
1484 * Initialize portlist with a random permutation. Based on
1485 * Knuth, as in ip_randomid() in sys/netinet/ip_id.c.
1486 */
1487 if (rflag) {
1488 for (x = 0; x <= hi - lo; x++) {
1489 cp = arc4random_uniform(x + 1);
1490 portlist[x] = portlist[cp];
1491 if (asprintf(&portlist[cp], "%d", x + lo) == -1)
1492 err(1, "asprintf");
1493 }
1494 } else { /* Load ports sequentially. */
1495 for (cp = lo; cp <= hi; cp++) {
1496 if (asprintf(&portlist[x], "%d", cp) == -1)
1497 err(1, "asprintf");
1498 x++;
1499 }
1500 }
1501 } else {
1502 char *tmp;
1503
1504 hi = strtoport(p, uflag);
1505 if (asprintf(&tmp, "%d", hi) != -1)
1506 portlist[0] = tmp;
1507 else
1508 err(1, NULL((void *)0));
1509 }
1510}
1511
1512/*
1513 * udptest()
1514 * Do a few writes to see if the UDP port is there.
1515 * Fails once PF state table is full.
1516 */
1517int
1518udptest(int s)
1519{
1520 int i, ret;
1521
1522 /* Only write to the socket in scan mode or interactive mode. */
1523 if (!zflag && !isatty(STDIN_FILENO0))
1524 return 0;
1525
1526 for (i = 0; i <= 3; i++) {
1527 if (write(s, "X", 1) == 1)
1528 ret = 1;
1529 else
1530 ret = -1;
1531 }
1532 return ret;
1533}
1534
1535void
1536connection_info(const char *host, const char *port, const char *proto,
1537 const char *ipaddr)
1538{
1539 struct servent *sv;
1540 char *service = "*";
1541
1542 /* Look up service name unless -n. */
1543 if (!nflag) {
1544 sv = getservbyport(ntohs(atoi(port))(__uint16_t)(__builtin_constant_p(atoi(port)) ? (__uint16_t)(
((__uint16_t)(atoi(port)) & 0xffU) << 8 | ((__uint16_t
)(atoi(port)) & 0xff00U) >> 8) : __swap16md(atoi(port
))), proto);
1545 if (sv != NULL((void *)0))
1546 service = sv->s_name;
1547 }
1548
1549 fprintf(stderr(&__sF[2]), "Connection to %s", host);
1550
1551 /*
1552 * if we aren't connecting thru a proxy and
1553 * there is something to report, print IP
1554 */
1555 if (!nflag && !xflag && strcmp(host, ipaddr) != 0)
1556 fprintf(stderr(&__sF[2]), " (%s)", ipaddr);
1557
1558 fprintf(stderr(&__sF[2]), " %s port [%s/%s] succeeded!\n", port, proto, service);
1559}
1560
1561void
1562set_common_sockopts(int s, int af)
1563{
1564 int x = 1;
1565
1566 if (Sflag) {
1567 if (setsockopt(s, IPPROTO_TCP6, TCP_MD5SIG0x04,
1568 &x, sizeof(x)) == -1)
1569 err(1, NULL((void *)0));
1570 }
1571 if (Dflag) {
1572 if (setsockopt(s, SOL_SOCKET0xffff, SO_DEBUG0x0001,
1573 &x, sizeof(x)) == -1)
1574 err(1, NULL((void *)0));
1575 }
1576 if (Tflag != -1) {
1577 if (af == AF_INET2 && setsockopt(s, IPPROTO_IP0,
1578 IP_TOS3, &Tflag, sizeof(Tflag)) == -1)
1579 err(1, "set IP ToS");
1580
1581 else if (af == AF_INET624 && setsockopt(s, IPPROTO_IPV641,
1582 IPV6_TCLASS61, &Tflag, sizeof(Tflag)) == -1)
1583 err(1, "set IPv6 traffic class");
1584 }
1585 if (Iflag) {
1586 if (setsockopt(s, SOL_SOCKET0xffff, SO_RCVBUF0x1002,
1587 &Iflag, sizeof(Iflag)) == -1)
1588 err(1, "set TCP receive buffer size");
1589 }
1590 if (Oflag) {
1591 if (setsockopt(s, SOL_SOCKET0xffff, SO_SNDBUF0x1001,
1592 &Oflag, sizeof(Oflag)) == -1)
1593 err(1, "set TCP send buffer size");
1594 }
1595
1596 if (ttl != -1) {
1597 if (af == AF_INET2 && setsockopt(s, IPPROTO_IP0,
1598 IP_TTL4, &ttl, sizeof(ttl)))
1599 err(1, "set IP TTL");
1600
1601 else if (af == AF_INET624 && setsockopt(s, IPPROTO_IPV641,
1602 IPV6_UNICAST_HOPS4, &ttl, sizeof(ttl)))
1603 err(1, "set IPv6 unicast hops");
1604 }
1605
1606 if (minttl != -1) {
1607 if (af == AF_INET2 && setsockopt(s, IPPROTO_IP0,
1608 IP_MINTTL32, &minttl, sizeof(minttl)))
1609 err(1, "set IP min TTL");
1610
1611 else if (af == AF_INET624 && setsockopt(s, IPPROTO_IPV641,
1612 IPV6_MINHOPCOUNT65, &minttl, sizeof(minttl)))
1613 err(1, "set IPv6 min hop count");
1614 }
1615}
1616
1617int
1618process_tos_opt(char *s, int *val)
1619{
1620 /* DiffServ Codepoints and other TOS mappings */
1621 const struct toskeywords {
1622 const char *keyword;
1623 int val;
1624 } *t, toskeywords[] = {
1625 { "af11", IPTOS_DSCP_AF110x28 },
1626 { "af12", IPTOS_DSCP_AF120x30 },
1627 { "af13", IPTOS_DSCP_AF130x38 },
1628 { "af21", IPTOS_DSCP_AF210x48 },
1629 { "af22", IPTOS_DSCP_AF220x50 },
1630 { "af23", IPTOS_DSCP_AF230x58 },
1631 { "af31", IPTOS_DSCP_AF310x68 },
1632 { "af32", IPTOS_DSCP_AF320x70 },
1633 { "af33", IPTOS_DSCP_AF330x78 },
1634 { "af41", IPTOS_DSCP_AF410x88 },
1635 { "af42", IPTOS_DSCP_AF420x90 },
1636 { "af43", IPTOS_DSCP_AF430x98 },
1637 { "critical", IPTOS_PREC_CRITIC_ECP0xa0 },
1638 { "cs0", IPTOS_DSCP_CS00x00 },
1639 { "cs1", IPTOS_DSCP_CS10x20 },
1640 { "cs2", IPTOS_DSCP_CS20x40 },
1641 { "cs3", IPTOS_DSCP_CS30x60 },
1642 { "cs4", IPTOS_DSCP_CS40x80 },
1643 { "cs5", IPTOS_DSCP_CS50xa0 },
1644 { "cs6", IPTOS_DSCP_CS60xc0 },
1645 { "cs7", IPTOS_DSCP_CS70xe0 },
1646 { "ef", IPTOS_DSCP_EF0xb8 },
1647 { "inetcontrol", IPTOS_PREC_INTERNETCONTROL0xc0 },
1648 { "lowdelay", IPTOS_LOWDELAY0x10 },
1649 { "netcontrol", IPTOS_PREC_NETCONTROL0xe0 },
1650 { "reliability", IPTOS_RELIABILITY0x04 },
1651 { "throughput", IPTOS_THROUGHPUT0x08 },
1652 { NULL((void *)0), -1 },
1653 };
1654
1655 for (t = toskeywords; t->keyword != NULL((void *)0); t++) {
1656 if (strcmp(s, t->keyword) == 0) {
1657 *val = t->val;
1658 return 1;
1659 }
1660 }
1661
1662 return 0;
1663}
1664
1665int
1666process_tls_opt(char *s, int *flags)
1667{
1668 size_t len;
1669 char *v;
1670
1671 const struct tlskeywords {
1672 const char *keyword;
1673 int flag;
1674 char **value;
1675 } *t, tlskeywords[] = {
1676 { "ciphers", -1, &tls_ciphers },
1677 { "clientcert", TLS_CCERT(1 << 3), NULL((void *)0) },
1678 { "muststaple", TLS_MUSTSTAPLE(1 << 4), NULL((void *)0) },
1679 { "noverify", TLS_NOVERIFY(1 << 1), NULL((void *)0) },
1680 { "noname", TLS_NONAME(1 << 2), NULL((void *)0) },
1681 { "protocols", -1, &tls_protocols },
1682 { NULL((void *)0), -1, NULL((void *)0) },
1683 };
1684
1685 len = strlen(s);
1686 if ((v = strchr(s, '=')) != NULL((void *)0)) {
1687 len = v - s;
1688 v++;
1689 }
1690
1691 for (t = tlskeywords; t->keyword != NULL((void *)0); t++) {
1692 if (strlen(t->keyword) == len &&
1693 strncmp(s, t->keyword, len) == 0) {
1694 if (t->value != NULL((void *)0)) {
1695 if (v == NULL((void *)0))
1696 errx(1, "invalid tls value `%s'", s);
1697 *t->value = v;
1698 } else {
1699 *flags |= t->flag;
1700 }
1701 return 1;
1702 }
1703 }
1704 return 0;
1705}
1706
1707void
1708save_peer_cert(struct tls *tls_ctx, FILE *fp)
1709{
1710 const char *pem;
1711 size_t plen;
1712
1713 if ((pem = tls_peer_cert_chain_pem(tls_ctx, &plen)) == NULL((void *)0))
1714 errx(1, "Can't get peer certificate");
1715 if (fprintf(fp, "%.*s", (int)plen, pem) < 0)
1716 err(1, "unable to save peer cert");
1717 if (fflush(fp) != 0)
1718 err(1, "unable to flush peer cert");
1719}
1720
1721void
1722report_tls(struct tls *tls_ctx, char *host)
1723{
1724 time_t t;
1725 const char *ocsp_url;
1726
1727 fprintf(stderr(&__sF[2]), "TLS handshake negotiated %s/%s with host %s\n",
1728 tls_conn_version(tls_ctx), tls_conn_cipher(tls_ctx), host);
1729 fprintf(stderr(&__sF[2]), "Peer name: %s\n",
1730 tls_expectname ? tls_expectname : host);
1731 if (tls_peer_cert_subject(tls_ctx))
1732 fprintf(stderr(&__sF[2]), "Subject: %s\n",
1733 tls_peer_cert_subject(tls_ctx));
1734 if (tls_peer_cert_issuer(tls_ctx))
1735 fprintf(stderr(&__sF[2]), "Issuer: %s\n",
1736 tls_peer_cert_issuer(tls_ctx));
1737 if ((t = tls_peer_cert_notbefore(tls_ctx)) != -1)
1738 fprintf(stderr(&__sF[2]), "Valid From: %s", ctime(&t));
1739 if ((t = tls_peer_cert_notafter(tls_ctx)) != -1)
1740 fprintf(stderr(&__sF[2]), "Valid Until: %s", ctime(&t));
1741 if (tls_peer_cert_hash(tls_ctx))
1742 fprintf(stderr(&__sF[2]), "Cert Hash: %s\n",
1743 tls_peer_cert_hash(tls_ctx));
1744 ocsp_url = tls_peer_ocsp_url(tls_ctx);
1745 if (ocsp_url != NULL((void *)0))
1746 fprintf(stderr(&__sF[2]), "OCSP URL: %s\n", ocsp_url);
1747 switch (tls_peer_ocsp_response_status(tls_ctx)) {
1748 case TLS_OCSP_RESPONSE_SUCCESSFUL0:
1749 fprintf(stderr(&__sF[2]), "OCSP Stapling: %s\n",
1750 tls_peer_ocsp_result(tls_ctx) == NULL((void *)0) ? "" :
1751 tls_peer_ocsp_result(tls_ctx));
1752 fprintf(stderr(&__sF[2]),
1753 " response_status=%d cert_status=%d crl_reason=%d\n",
1754 tls_peer_ocsp_response_status(tls_ctx),
1755 tls_peer_ocsp_cert_status(tls_ctx),
1756 tls_peer_ocsp_crl_reason(tls_ctx));
1757 t = tls_peer_ocsp_this_update(tls_ctx);
1758 fprintf(stderr(&__sF[2]), " this update: %s",
1759 t != -1 ? ctime(&t) : "\n");
1760 t = tls_peer_ocsp_next_update(tls_ctx);
1761 fprintf(stderr(&__sF[2]), " next update: %s",
1762 t != -1 ? ctime(&t) : "\n");
1763 t = tls_peer_ocsp_revocation_time(tls_ctx);
1764 fprintf(stderr(&__sF[2]), " revocation: %s",
1765 t != -1 ? ctime(&t) : "\n");
1766 break;
1767 case -1:
1768 break;
1769 default:
1770 fprintf(stderr(&__sF[2]),
1771 "OCSP Stapling: failure - response_status %d (%s)\n",
1772 tls_peer_ocsp_response_status(tls_ctx),
1773 tls_peer_ocsp_result(tls_ctx) == NULL((void *)0) ? "" :
1774 tls_peer_ocsp_result(tls_ctx));
1775 break;
1776 }
1777}
1778
1779void
1780report_sock(const char *msg, const struct sockaddr *sa, socklen_t salen,
1781 char *path)
1782{
1783 char host[NI_MAXHOST256], port[NI_MAXSERV32];
1784 int herr;
1785 int flags = NI_NUMERICSERV2;
1786
1787 if (path != NULL((void *)0)) {
1788 fprintf(stderr(&__sF[2]), "%s on %s\n", msg, path);
1789 return;
1790 }
1791
1792 if (nflag)
1793 flags |= NI_NUMERICHOST1;
1794
1795 herr = getnameinfo(sa, salen, host, sizeof(host), port, sizeof(port),
1796 flags);
1797 switch (herr) {
1798 case 0:
1799 break;
1800 case EAI_SYSTEM-11:
1801 err(1, "getnameinfo");
1802 default:
1803 errx(1, "getnameinfo: %s", gai_strerror(herr));
1804 }
1805
1806 fprintf(stderr(&__sF[2]), "%s on %s %s\n", msg, host, port);
1807}
1808
1809void
1810help(void)
1811{
1812 usage(0);
1813 fprintf(stderr(&__sF[2]), "\tCommand Summary:\n\
1814 \t-4 Use IPv4\n\
1815 \t-6 Use IPv6\n\
1816 \t-C certfile Public key file\n\
1817 \t-c Use TLS\n\
1818 \t-D Enable the debug socket option\n\
1819 \t-d Detach from stdin\n\
1820 \t-e name\t Required name in peer certificate\n\
1821 \t-F Pass socket fd\n\
1822 \t-H hash\t Hash string of peer certificate\n\
1823 \t-h This help text\n\
1824 \t-I length TCP receive buffer length\n\
1825 \t-i interval Delay interval for lines sent, ports scanned\n\
1826 \t-K keyfile Private key file\n\
1827 \t-k Keep inbound sockets open for multiple connects\n\
1828 \t-l Listen mode, for inbound connects\n\
1829 \t-M ttl Outgoing TTL / Hop Limit\n\
1830 \t-m minttl Minimum incoming TTL / Hop Limit\n\
1831 \t-N Shutdown the network socket after EOF on stdin\n\
1832 \t-n Suppress name/port resolutions\n\
1833 \t-O length TCP send buffer length\n\
1834 \t-o staplefile Staple file\n\
1835 \t-P proxyuser\tUsername for proxy authentication\n\
1836 \t-p port\t Specify local port for remote connects\n\
1837 \t-R CAfile CA bundle\n\
1838 \t-r Randomize remote ports\n\
1839 \t-S Enable the TCP MD5 signature option\n\
1840 \t-s sourceaddr Local source address\n\
1841 \t-T keyword TOS value or TLS options\n\
1842 \t-t Answer TELNET negotiation\n\
1843 \t-U Use UNIX domain socket\n\
1844 \t-u UDP mode\n\
1845 \t-V rtable Specify alternate routing table\n\
1846 \t-v Verbose\n\
1847 \t-W recvlimit Terminate after receiving a number of packets\n\
1848 \t-w timeout Timeout for connects and final net reads\n\
1849 \t-X proto Proxy protocol: \"4\", \"5\" (SOCKS) or \"connect\"\n\
1850 \t-x addr[:port]\tSpecify proxy address and port\n\
1851 \t-Z Peer certificate file\n\
1852 \t-z Zero-I/O mode [used for scanning]\n\
1853 Port numbers can be individual or ranges: lo-hi [inclusive]\n");
1854 exit(1);
1855}
1856
1857void
1858usage(int ret)
1859{
1860 fprintf(stderr(&__sF[2]),
1861 "usage: nc [-46cDdFhklNnrStUuvz] [-C certfile] [-e name] "
1862 "[-H hash] [-I length]\n"
1863 "\t [-i interval] [-K keyfile] [-M ttl] [-m minttl] [-O length]\n"
1864 "\t [-o staplefile] [-P proxy_username] [-p source_port] "
1865 "[-R CAfile]\n"
1866 "\t [-s sourceaddr] [-T keyword] [-V rtable] [-W recvlimit] "
1867 "[-w timeout]\n"
1868 "\t [-X proxy_protocol] [-x proxy_address[:port]] "
1869 "[-Z peercertfile]\n"
1870 "\t [destination] [port]\n");
1871 if (ret)
1872 exit(1);
1873}