source: heimdal/trunk/lib/roken/rkpty.c

Last change on this file was 1, checked in by Paul Smedley, 10 years ago

Initial commit of Heimdal 1.5.3
File size: 7.9 KB
Line 
1/*
2 * Copyright (c) 2008 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * 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 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include "config.h"
35
36#ifndef HAVE_SYS_TYPES_H
37#include <sys/types.h>
38#endif
39#ifdef HAVE_SYS_WAIT_H
40#include <sys/wait.h>
41#endif
42#include <stdio.h>
43#include <stdlib.h>
44#ifdef HAVE_UNISTD_H
45#include <unistd.h>
46#endif
47#ifdef HAVE_PTY_H
48#include <pty.h>
49#endif
50#ifdef HAVE_UTIL_H
51#include <util.h>
52#endif
53#ifdef HAVE_LIBUTIL_H
54#include <libutil.h>
55#endif
56
57#ifdef STREAMSPTY
58#include <stropts.h>
59#endif /* STREAMPTY */
60
61#include "roken.h"
62#include <getarg.h>
63
64struct command {
65 enum { CMD_EXPECT = 0, CMD_SEND, CMD_PASSWORD } type;
66 unsigned int lineno;
67 char *str;
68 struct command *next;
69};
70
71/*
72 *
73 */
74
75static struct command *commands, **next = &commands;
76
77static sig_atomic_t alarmset = 0;
78
79static int timeout = 10;
80static int verbose;
81static int help_flag;
82static int version_flag;
83
84static int master;
85static int slave;
86static char line[256] = { 0 };
87
88static void
89caught_signal(int signo)
90{
91 alarmset = signo;
92}
93
94
95static void
96open_pty(void)
97{
98#ifdef _AIX
99 printf("implement open_pty\n");
100 exit(77);
101#endif
102#if defined(HAVE_OPENPTY) || defined(__linux) || defined(__osf__) /* XXX */
103 if(openpty(&master, &slave, line, 0, 0) == 0)
104 return;
105#endif /* HAVE_OPENPTY .... */
106#ifdef STREAMSPTY
107 {
108 char *clone[] = {
109 "/dev/ptc",
110 "/dev/ptmx",
111 "/dev/ptm",
112 "/dev/ptym/clone",
113 NULL
114 };
115 char **q;
116
117 for(q = clone; *q; q++){
118 master = open(*q, O_RDWR);
119 if(master >= 0){
120#ifdef HAVE_GRANTPT
121 grantpt(master);
122#endif
123#ifdef HAVE_UNLOCKPT
124 unlockpt(master);
125#endif
126 strlcpy(line, ptsname(master), sizeof(line));
127 slave = open(line, O_RDWR);
128 if (slave < 0)
129 errx(1, "failed to open slave when using %s", *q);
130 ioctl(slave, I_PUSH, "ptem");
131 ioctl(slave, I_PUSH, "ldterm");
132
133 return;
134 }
135 }
136 }
137#endif /* STREAMSPTY */
138
139 /* more cases, like open /dev/ptmx, etc */
140
141 exit(77);
142}
143
144/*
145 *
146 */
147
148static char *
149iscmd(const char *buf, const char *s)
150{
151 size_t len = strlen(s);
152 if (strncmp(buf, s, len) != 0)
153 return NULL;
154 return estrdup(buf + len);
155}
156
157static void
158parse_configuration(const char *fn)
159{
160 struct command *c;
161 char s[1024];
162 char *str;
163 unsigned int lineno = 0;
164 FILE *cmd;
165
166 cmd = fopen(fn, "r");
167 if (cmd == NULL)
168 err(1, "open: %s", fn);
169
170 while (fgets(s, sizeof(s), cmd) != NULL) {
171
172 s[strcspn(s, "#\n")] = '\0';
173 lineno++;
174
175 c = calloc(1, sizeof(*c));
176 if (c == NULL)
177 errx(1, "malloc");
178
179 c->lineno = lineno;
180 (*next) = c;
181 next = &(c->next);
182
183 if ((str = iscmd(s, "expect ")) != NULL) {
184 c->type = CMD_EXPECT;
185 c->str = str;
186 } else if ((str = iscmd(s, "send ")) != NULL) {
187 c->type = CMD_SEND;
188 c->str = str;
189 } else if ((str = iscmd(s, "password ")) != NULL) {
190 c->type = CMD_PASSWORD;
191 c->str = str;
192 } else
193 errx(1, "Invalid command on line %d: %s", lineno, s);
194 }
195
196 fclose(cmd);
197}
198
199
200/*
201 *
202 */
203
204static int
205eval_parent(pid_t pid)
206{
207 struct command *c;
208 char in;
209 size_t len = 0;
210 ssize_t sret;
211
212 for (c = commands; c != NULL; c = c->next) {
213 switch(c->type) {
214 case CMD_EXPECT:
215 if (verbose)
216 printf("[expecting %s]", c->str);
217 len = 0;
218 alarm(timeout);
219 while((sret = read(master, &in, sizeof(in))) > 0) {
220 alarm(timeout);
221 printf("%c", in);
222 if (c->str[len] != in) {
223 len = 0;
224 continue;
225 }
226 len++;
227 if (c->str[len] == '\0')
228 break;
229 }
230 alarm(0);
231 if (alarmset == SIGALRM)
232 errx(1, "timeout waiting for %s (line %u)",
233 c->str, c->lineno);
234 else if (alarmset)
235 errx(1, "got a signal %d waiting for %s (line %u)",
236 alarmset, c->str, c->lineno);
237 if (sret <= 0)
238 errx(1, "end command while waiting for %s (line %u)",
239 c->str, c->lineno);
240 break;
241 case CMD_SEND:
242 case CMD_PASSWORD: {
243 size_t i = 0;
244 const char *msg = (c->type == CMD_PASSWORD) ? "****" : c->str;
245
246 if (verbose)
247 printf("[send %s]", msg);
248
249 len = strlen(c->str);
250
251 while (i < len) {
252 if (c->str[i] == '\\' && i < len - 1) {
253 char ctrl;
254 i++;
255 switch(c->str[i]) {
256 case 'n': ctrl = '\n'; break;
257 case 'r': ctrl = '\r'; break;
258 case 't': ctrl = '\t'; break;
259 default:
260 errx(1, "unknown control char %c (line %u)",
261 c->str[i], c->lineno);
262 }
263 if (net_write(master, &ctrl, 1) != 1)
264 errx(1, "command refused input (line %u)", c->lineno);
265 } else {
266 if (net_write(master, &c->str[i], 1) != 1)
267 errx(1, "command refused input (line %u)", c->lineno);
268 }
269 i++;
270 }
271 break;
272 }
273 default:
274 abort();
275 }
276 }
277 while(read(master, &in, sizeof(in)) > 0)
278 printf("%c", in);
279
280 if (verbose)
281 printf("[end of program]\n");
282
283 /*
284 * Fetch status from child
285 */
286 {
287 int ret, status;
288
289 ret = waitpid(pid, &status, 0);
290 if (ret == -1)
291 err(1, "waitpid");
292 if (WIFEXITED(status) && WEXITSTATUS(status))
293 return WEXITSTATUS(status);
294 else if (WIFSIGNALED(status)) {
295 printf("killed by signal: %d\n", WTERMSIG(status));
296 return 1;
297 }
298 }
299 return 0;
300}
301
302/*
303 *
304 */
305
306static struct getargs args[] = {
307 { "timeout", 't', arg_integer, &timeout, "timout", "seconds" },
308 { "verbose", 'v', arg_counter, &verbose, "verbose debugging" },
309 { "version", 0, arg_flag, &version_flag, "print version" },
310 { "help", 0, arg_flag, &help_flag, NULL }
311};
312
313static void
314usage(int ret)
315{
316 arg_printusage (args, sizeof(args)/sizeof(*args), NULL, "infile command..");
317 exit (ret);
318}
319
320int
321main(int argc, char **argv)
322{
323 int optidx = 0;
324 pid_t pid;
325
326 setprogname(argv[0]);
327
328 if(getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &optidx))
329 usage(1);
330
331 if (help_flag)
332 usage (0);
333
334 if (version_flag) {
335 fprintf (stderr, "%s from %s-%s\n", getprogname(), PACKAGE, VERSION);
336 return 0;
337 }
338
339 argv += optidx;
340 argc -= optidx;
341
342 if (argc < 2)
343 usage(1);
344
345 parse_configuration(argv[0]);
346
347 argv += 1;
348
349 open_pty();
350
351 pid = fork();
352 switch (pid) {
353 case -1:
354 err(1, "Failed to fork");
355 case 0:
356
357 if(setsid()<0)
358 err(1, "setsid");
359
360 dup2(slave, STDIN_FILENO);
361 dup2(slave, STDOUT_FILENO);
362 dup2(slave, STDERR_FILENO);
363 closefrom(STDERR_FILENO + 1);
364
365 execvp(argv[0], argv); /* add NULL to end of array ? */
366 err(1, "Failed to exec: %s", argv[0]);
367 default:
368 close(slave);
369 {
370 struct sigaction sa;
371
372 sa.sa_handler = caught_signal;
373 sa.sa_flags = 0;
374 sigemptyset (&sa.sa_mask);
375
376 sigaction(SIGALRM, &sa, NULL);
377 }
378
379 return eval_parent(pid);
380 }
381}
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