1 /* $NetBSD: rkpty.c,v 1.2 2017/01/28 21:31:50 christos Exp $ */
2
3 /*
4 * Copyright (c) 2008 Kungliga Tekniska Högskolan
5 * (Royal Institute of Technology, Stockholm, Sweden).
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * 3. Neither the name of the Institute nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #include "config.h"
37
38 #ifndef HAVE_SYS_TYPES_H
39 #include <sys/types.h>
40 #endif
41 #ifdef HAVE_SYS_WAIT_H
42 #include <sys/wait.h>
43 #endif
44 #include <stdio.h>
45 #include <stdlib.h>
46 #ifdef HAVE_UNISTD_H
47 #include <unistd.h>
48 #endif
49 #ifdef HAVE_PTY_H
50 #include <pty.h>
51 #endif
52 #ifdef HAVE_UTIL_H
53 #include <util.h>
54 #endif
55 #ifdef HAVE_LIBUTIL_H
56 #include <libutil.h>
57 #endif
58
59 #ifdef STREAMSPTY
60 #include <stropts.h>
61 #endif /* STREAMPTY */
62
63 #include <krb5/roken.h>
64 #include <krb5/getarg.h>
65
66 struct command {
67 enum { CMD_EXPECT = 0, CMD_SEND, CMD_PASSWORD } type;
68 unsigned int lineno;
69 char *str;
70 struct command *next;
71 };
72
73 /*
74 *
75 */
76
77 static struct command *commands, **next = &commands;
78
79 static sig_atomic_t alarmset = 0;
80
81 static int timeout = 10;
82 static int verbose;
83 static int help_flag;
84 static int version_flag;
85
86 static int master;
87 static int slave;
88 static char line[256] = { 0 };
89
90 static void
caught_signal(int signo)91 caught_signal(int signo)
92 {
93 alarmset = signo;
94 }
95
96
97 static void
open_pty(void)98 open_pty(void)
99 {
100 #ifdef _AIX
101 printf("implement open_pty\n");
102 exit(77);
103 #endif
104 #if defined(HAVE_OPENPTY) || defined(__osf__) /* XXX */
105 if(openpty(&master, &slave, line, 0, 0) == 0)
106 return;
107 #endif /* HAVE_OPENPTY .... */
108 #ifdef STREAMSPTY
109 {
110 char *clone[] = {
111 "/dev/ptc",
112 "/dev/ptmx",
113 "/dev/ptm",
114 "/dev/ptym/clone",
115 NULL
116 };
117 char **q;
118
119 for(q = clone; *q; q++){
120 master = open(*q, O_RDWR);
121 if(master >= 0){
122 #ifdef HAVE_GRANTPT
123 grantpt(master);
124 #endif
125 #ifdef HAVE_UNLOCKPT
126 unlockpt(master);
127 #endif
128 strlcpy(line, ptsname(master), sizeof(line));
129 slave = open(line, O_RDWR);
130 if (slave < 0)
131 errx(1, "failed to open slave when using %s", *q);
132 ioctl(slave, I_PUSH, "ptem");
133 ioctl(slave, I_PUSH, "ldterm");
134
135 return;
136 }
137 }
138 }
139 #endif /* STREAMSPTY */
140
141 /* more cases, like open /dev/ptmx, etc */
142
143 exit(77);
144 }
145
146 /*
147 *
148 */
149
150 static char *
iscmd(const char * buf,const char * s)151 iscmd(const char *buf, const char *s)
152 {
153 size_t len = strlen(s);
154 if (strncmp(buf, s, len) != 0)
155 return NULL;
156 return estrdup(buf + len);
157 }
158
159 static void
parse_configuration(const char * fn)160 parse_configuration(const char *fn)
161 {
162 struct command *c;
163 char s[1024];
164 char *str;
165 unsigned int lineno = 0;
166 FILE *cmd;
167
168 cmd = fopen(fn, "r");
169 if (cmd == NULL)
170 err(1, "open: %s", fn);
171
172 while (fgets(s, sizeof(s), cmd) != NULL) {
173
174 s[strcspn(s, "#\n")] = '\0';
175 lineno++;
176
177 c = calloc(1, sizeof(*c));
178 if (c == NULL)
179 errx(1, "malloc");
180
181 c->lineno = lineno;
182 (*next) = c;
183 next = &(c->next);
184
185 if ((str = iscmd(s, "expect ")) != NULL) {
186 c->type = CMD_EXPECT;
187 c->str = str;
188 } else if ((str = iscmd(s, "send ")) != NULL) {
189 c->type = CMD_SEND;
190 c->str = str;
191 } else if ((str = iscmd(s, "password ")) != NULL) {
192 c->type = CMD_PASSWORD;
193 c->str = str;
194 } else
195 errx(1, "Invalid command on line %d: %s", lineno, s);
196 }
197
198 fclose(cmd);
199 }
200
201
202 /*
203 *
204 */
205
206 static int
eval_parent(pid_t pid)207 eval_parent(pid_t pid)
208 {
209 struct command *c;
210 char in;
211 size_t len = 0;
212 ssize_t sret;
213
214 for (c = commands; c != NULL; c = c->next) {
215 switch(c->type) {
216 case CMD_EXPECT:
217 if (verbose)
218 printf("[expecting %s]", c->str);
219 len = 0;
220 alarm(timeout);
221 while((sret = read(master, &in, sizeof(in))) > 0) {
222 alarm(timeout);
223 printf("%c", in);
224 if (c->str[len] != in) {
225 len = 0;
226 continue;
227 }
228 len++;
229 if (c->str[len] == '\0')
230 break;
231 }
232 alarm(0);
233 if (alarmset == SIGALRM)
234 errx(1, "timeout waiting for %s (line %u)",
235 c->str, c->lineno);
236 else if (alarmset)
237 errx(1, "got a signal %d waiting for %s (line %u)",
238 (int)alarmset, c->str, c->lineno);
239 if (sret <= 0)
240 errx(1, "end command while waiting for %s (line %u)",
241 c->str, c->lineno);
242 break;
243 case CMD_SEND:
244 case CMD_PASSWORD: {
245 size_t i = 0;
246 const char *msg = (c->type == CMD_PASSWORD) ? "****" : c->str;
247
248 if (verbose)
249 printf("[send %s]", msg);
250
251 len = strlen(c->str);
252
253 while (i < len) {
254 if (c->str[i] == '\\' && i < len - 1) {
255 char ctrl;
256 i++;
257 switch(c->str[i]) {
258 case 'n': ctrl = '\n'; break;
259 case 'r': ctrl = '\r'; break;
260 case 't': ctrl = '\t'; break;
261 default:
262 errx(1, "unknown control char %c (line %u)",
263 c->str[i], c->lineno);
264 }
265 if (net_write(master, &ctrl, 1) != 1)
266 errx(1, "command refused input (line %u)", c->lineno);
267 } else {
268 if (net_write(master, &c->str[i], 1) != 1)
269 errx(1, "command refused input (line %u)", c->lineno);
270 }
271 i++;
272 }
273 break;
274 }
275 default:
276 abort();
277 }
278 }
279 while(read(master, &in, sizeof(in)) > 0)
280 printf("%c", in);
281
282 if (verbose)
283 printf("[end of program]\n");
284
285 /*
286 * Fetch status from child
287 */
288 {
289 int ret, status;
290
291 ret = waitpid(pid, &status, 0);
292 if (ret == -1)
293 err(1, "waitpid");
294 if (WIFEXITED(status) && WEXITSTATUS(status))
295 return WEXITSTATUS(status);
296 else if (WIFSIGNALED(status)) {
297 printf("killed by signal: %d\n", WTERMSIG(status));
298 return 1;
299 }
300 }
301 return 0;
302 }
303
304 /*
305 *
306 */
307
308 static struct getargs args[] = {
309 { "timeout", 't', arg_integer, &timeout, "timout", "seconds" },
310 { "verbose", 'v', arg_counter, &verbose, "verbose debugging", NULL },
311 { "version", 0, arg_flag, &version_flag, "print version", NULL },
312 { "help", 0, arg_flag, &help_flag, NULL, NULL }
313 };
314
315 static void
usage(int ret)316 usage(int ret)
317 {
318 arg_printusage (args, sizeof(args)/sizeof(*args), NULL, "infile command..");
319 exit (ret);
320 }
321
322 int
main(int argc,char ** argv)323 main(int argc, char **argv)
324 {
325 int optidx = 0;
326 pid_t pid;
327
328 setprogname(argv[0]);
329
330 if(getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &optidx))
331 usage(1);
332
333 if (help_flag)
334 usage (0);
335
336 if (version_flag) {
337 fprintf (stderr, "%s from %s-%s\n", getprogname(), PACKAGE, VERSION);
338 return 0;
339 }
340
341 argv += optidx;
342 argc -= optidx;
343
344 if (argc < 2)
345 usage(1);
346
347 parse_configuration(argv[0]);
348
349 argv += 1;
350
351 open_pty();
352
353 pid = fork();
354 switch (pid) {
355 case -1:
356 err(1, "Failed to fork");
357 case 0:
358
359 if(setsid()<0)
360 err(1, "setsid");
361
362 dup2(slave, STDIN_FILENO);
363 dup2(slave, STDOUT_FILENO);
364 dup2(slave, STDERR_FILENO);
365 closefrom(STDERR_FILENO + 1);
366
367 execvp(argv[0], argv); /* add NULL to end of array ? */
368 err(1, "Failed to exec: %s", argv[0]);
369 default:
370 close(slave);
371 {
372 struct sigaction sa;
373
374 sa.sa_handler = caught_signal;
375 sa.sa_flags = 0;
376 sigemptyset (&sa.sa_mask);
377
378 sigaction(SIGALRM, &sa, NULL);
379 }
380
381 return eval_parent(pid);
382 }
383 }
384