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
tninit(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
usage(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
main(int argc,char * argv[])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