xref: /netbsd-src/usr.bin/telnet/main.c (revision 33b82b03392e2106db8728db8eea7f5301157325)
1 /*	$NetBSD: main.c,v 1.33 2024/11/03 10:43:27 rillig Exp $	*/
2 
3 /*
4  * Copyright (c) 1988, 1990, 1993
5  *	The Regents of the University of California.  All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
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. Neither the name of the University nor the names of its contributors
16  *    may be used to endorse or promote products derived from this software
17  *    without specific prior written permission.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29  * SUCH DAMAGE.
30  */
31 
32 #include <sys/cdefs.h>
33 #ifndef lint
34 __COPYRIGHT("@(#) Copyright (c) 1988, 1990, 1993\
35  The Regents of the University of California.  All rights reserved.");
36 #endif /* not lint */
37 
38 #ifndef lint
39 #if 0
40 static char sccsid[] = "@(#)main.c	8.3 (Berkeley) 5/30/95";
41 #else
42 __RCSID("$NetBSD: main.c,v 1.33 2024/11/03 10:43:27 rillig Exp $");
43 #endif
44 #endif /* not lint */
45 
46 #include <sys/types.h>
47 #include <sys/socket.h>
48 
49 #include <unistd.h>
50 
51 #include "ring.h"
52 #include "externs.h"
53 #include "defines.h"
54 #ifdef AUTHENTICATION
55 #include <libtelnet/auth.h>
56 #endif
57 #ifdef ENCRYPTION
58 #include <libtelnet/encrypt.h>
59 #endif
60 
61 /* These values need to be the same as defined in libtelnet/kerberos5.c */
62 /* Either define them in both places, or put in some common header file. */
63 #define OPTS_FORWARD_CREDS	0x00000002
64 #define OPTS_FORWARDABLE_CREDS	0x00000001
65 
66 #if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)
67 char *ipsec_policy_in = NULL;
68 char *ipsec_policy_out = NULL;
69 #endif
70 
71 int family = AF_UNSPEC;
72 
73 /*
74  * Initialize variables.
75  */
76 void
77 tninit(void)
78 {
79     init_terminal();
80 
81     init_network();
82 
83     init_telnet();
84 
85     init_sys();
86 
87 }
88 
89 	void
90 usage(void)
91 {
92 	fprintf(stderr, "usage: %s %s%s%s%s\n",
93 	    prompt,
94 #ifdef	AUTHENTICATION
95 	    "[-4] [-6] [-8] [-E] [-K] [-L] [-N] [-S tos] [-X atype] [-a] [-c]",
96 	    "\n\t[-d] [-e char] [-k realm] [-l user] [-f/-F] [-n tracefile] ",
97 #else
98 	    "[-4] [-6] [-8] [-E] [-L] [-N] [-S tos] [-a] [-c] [-d] [-e char]",
99 	    "\n\t[-l user] [-n tracefile] ",
100 #endif
101 	    "[-r] ",
102 #ifdef	ENCRYPTION
103 	    "[-x] "
104 #endif
105 #if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)
106 	    "\n\t[-P policy] [host-name [port]]"
107 #else
108 	    "\n\t[host-name [port]]"
109 #endif
110 	);
111 	exit(1);
112 }
113 
114 /*
115  * main.  Parse arguments, invoke the protocol or command parser.
116  */
117 
118 
119 int
120 main(int argc, char *argv[])
121 {
122 	int ch;
123 	char *user;
124 #ifdef	FORWARD
125 	extern int forward_flags;
126 #endif	/* FORWARD */
127 
128 	tninit();		/* Clear out things */
129 
130 	TerminalSaveState();
131 
132 	if ((prompt = strrchr(argv[0], '/')) != NULL)
133 		++prompt;
134 	else
135 		prompt = argv[0];
136 
137 	user = NULL;
138 
139 	rlogin = (strncmp(prompt, "rlog", 4) == 0) ? '~' : _POSIX_VDISABLE;
140 	autologin = -1;
141 
142 #if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)
143 #define IPSECOPT	"P:"
144 #else
145 #define IPSECOPT
146 #endif
147 	while ((ch = getopt(argc, argv, "468EKLNS:X:acde:fFk:l:n:rt:x"
148 			IPSECOPT)) != -1) {
149 #undef IPSECOPT
150 		switch(ch) {
151 		case '4':
152 			family = AF_INET;
153 			break;
154 		case '6':
155 			family = AF_INET6;
156 			break;
157 		case '8':
158 			eight = 3;	/* binary output and input */
159 			break;
160 		case 'E':
161 			rlogin = escape = _POSIX_VDISABLE;
162 			break;
163 		case 'K':
164 #ifdef	AUTHENTICATION
165 			autologin = 0;
166 #endif
167 			break;
168 		case 'L':
169 			eight |= 2;	/* binary output only */
170 			break;
171 		case 'N':
172 			doaddrlookup = 0;
173 			break;
174 		case 'S':
175 		    {
176 			fprintf(stderr,
177 			   "%s: Warning: -S ignored, no parsetos() support.\n",
178 								prompt);
179 		    }
180 			break;
181 		case 'X':
182 #ifdef	AUTHENTICATION
183 			auth_disable_name(optarg);
184 #endif
185 			break;
186 		case 'a':
187 			autologin = 1;
188 			break;
189 		case 'c':
190 			skiprc = 1;
191 			break;
192 		case 'd':
193 			telnet_debug = 1;
194 			break;
195 		case 'e':
196 			set_escape_char(optarg);
197 			break;
198 		case 'f':
199 #if defined(AUTHENTICATION) && defined(KRB5) && defined(FORWARD)
200 			if (forward_flags & OPTS_FORWARD_CREDS) {
201 			    fprintf(stderr,
202 				    "%s: Only one of -f and -F allowed.\n",
203 				    prompt);
204 			    usage();
205 			}
206 			forward_flags |= OPTS_FORWARD_CREDS;
207 #else
208 			fprintf(stderr,
209 			 "%s: Warning: -f ignored, no Kerberos V5 support.\n",
210 				prompt);
211 #endif
212 			break;
213 		case 'F':
214 #if defined(AUTHENTICATION) && defined(KRB5) && defined(FORWARD)
215 			if (forward_flags & OPTS_FORWARD_CREDS) {
216 			    fprintf(stderr,
217 				    "%s: Only one of -f and -F allowed.\n",
218 				    prompt);
219 			    usage();
220 			}
221 			forward_flags |= OPTS_FORWARD_CREDS;
222 			forward_flags |= OPTS_FORWARDABLE_CREDS;
223 #else
224 			fprintf(stderr,
225 			 "%s: Warning: -F ignored, no Kerberos V5 support.\n",
226 				prompt);
227 #endif
228 			break;
229 		case 'k':
230 			fprintf(stderr,
231 			   "%s: Warning: -k ignored, no Kerberos V4 support.\n",
232 								prompt);
233 			break;
234 		case 'l':
235 			if(autologin == 0) {
236 				autologin = -1;
237 			}
238 			user = optarg;
239 			break;
240 		case 'n':
241 				SetNetTrace(optarg);
242 			break;
243 		case 'r':
244 			rlogin = '~';
245 			break;
246 		case 't':
247 			fprintf(stderr,
248 			   "%s: Warning: -t ignored, no TN3270 support.\n",
249 								prompt);
250 			break;
251 		case 'x':
252 #ifdef	ENCRYPTION
253 			encrypt_auto(1);
254 			decrypt_auto(1);
255 #else	/* ENCRYPTION */
256 			fprintf(stderr,
257 			    "%s: Warning: -x ignored, no ENCRYPT support.\n",
258 								prompt);
259 #endif	/* ENCRYPTION */
260 			break;
261 #if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)
262 		case 'P':
263 			if (!strncmp("in", optarg, 2))
264 				ipsec_policy_in = strdup(optarg);
265 			else if (!strncmp("out", optarg, 3))
266 				ipsec_policy_out = strdup(optarg);
267 			else
268 				usage();
269 			break;
270 #endif
271 		case '?':
272 		default:
273 			usage();
274 			/* NOTREACHED */
275 		}
276 	}
277 
278 	if (autologin == -1) {		/* esc@magic.fi; force  */
279 #if defined(AUTHENTICATION)
280 		autologin = 1;
281 #endif
282 #if defined(ENCRYPTION)
283 		encrypt_auto(1);
284 		decrypt_auto(1);
285 #endif
286 	}
287 
288 	if (autologin == -1)
289 		autologin = (rlogin == _POSIX_VDISABLE) ? 0 : 1;
290 
291 	argc -= optind;
292 	argv += optind;
293 
294 	if (argc) {
295 		static char ml[] = "-l";
296 		char *args[7];
297 		char ** volatile argp;	/* avoid longjmp clobbering */
298 
299 		argp = args;
300 		if (argc > 2)
301 			usage();
302 		*argp++ = prompt;
303 		if (user) {
304 			*argp++ = ml;
305 			*argp++ = user;
306 		}
307 		*argp++ = argv[0];		/* host */
308 		if (argc > 1)
309 			*argp++ = argv[1];	/* port */
310 		*argp = 0;
311 
312 		if (setjmp(toplevel) != 0)
313 			Exit(0);
314 		if (tn((int)(argp - args), args) == 1)
315 			return (0);
316 		else
317 			return (1);
318 	}
319 	(void)setjmp(toplevel);
320 	for (;;) {
321 			command(1, 0, 0);
322 	}
323 }
324