source: branches/samba-3.5.x/source4/heimdal/lib/roken/rkpty.c

Last change on this file was 414, checked in by Herwig Bauernfeind, 16 years ago

Samba 3.5.0: Initial import
File size: 7.8 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#include <unistd.h>
45#ifdef HAVE_PTY_H
46#include <pty.h>
47#endif
48#ifdef HAVE_UTIL_H
49#include <util.h>
50#endif
51#ifdef HAVE_LIBUTIL_H
52#include <libutil.h>
53#endif
54
55#ifdef STREAMSPTY
56#include <stropts.h>
57#endif /* STREAMPTY */
58
59#include "roken.h"
60#include <getarg.h>
61
62struct command {
63 enum { CMD_EXPECT = 0, CMD_SEND, CMD_PASSWORD } type;
64 unsigned int lineno;
65 char *str;
66 struct command *next;
67};
68
69/*
70 *
71 */
72
73static struct command *commands, **next = &commands;
74
75static sig_atomic_t alarmset = 0;
76
77static int timeout = 10;
78static int verbose;
79static int help_flag;
80static int version_flag;
81
82static int master;
83static int slave;
84static char line[256] = { 0 };
85
86static void
87caught_signal(int signo)
88{
89 alarmset = signo;
90}
91
92
93static void
94open_pty(void)
95{
96#if defined(HAVE_OPENPTY) || defined(__linux) || defined(__osf__) /* XXX */
97 if(openpty(&master, &slave, line, 0, 0) == 0)
98 return;
99#endif /* HAVE_OPENPTY .... */
100#ifdef STREAMSPTY
101 {
102 char *clone[] = {
103 "/dev/ptc",
104 "/dev/ptmx",
105 "/dev/ptm",
106 "/dev/ptym/clone",
107 NULL
108 };
109 char **q;
110
111 for(q = clone; *q; q++){
112 master = open(*q, O_RDWR);
113 if(master >= 0){
114#ifdef HAVE_GRANTPT
115 grantpt(master);
116#endif
117#ifdef HAVE_UNLOCKPT
118 unlockpt(master);
119#endif
120 strlcpy(line, ptsname(master), sizeof(line));
121 slave = open(line, O_RDWR);
122 if (slave < 0)
123 errx(1, "failed to open slave when using %s", q);
124 ioctl(slave, I_PUSH, "ptem");
125 ioctl(slave, I_PUSH, "ldterm");
126
127 return;
128 }
129 }
130 }
131#endif /* STREAMSPTY */
132
133 /* more cases, like open /dev/ptmx, etc */
134
135 exit(77);
136}
137
138/*
139 *
140 */
141
142static char *
143iscmd(const char *buf, const char *s)
144{
145 size_t len = strlen(s);
146 if (strncmp(buf, s, len) != 0)
147 return NULL;
148 return estrdup(buf + len);
149}
150
151static void
152parse_configuration(const char *fn)
153{
154 struct command *c;
155 char s[1024];
156 char *str;
157 unsigned int lineno = 0;
158 FILE *cmd;
159
160 cmd = fopen(fn, "r");
161 if (cmd == NULL)
162 err(1, "open: %s", fn);
163
164 while (fgets(s, sizeof(s), cmd) != NULL) {
165
166 s[strcspn(s, "#\n")] = '\0';
167 lineno++;
168
169 c = calloc(1, sizeof(*c));
170 if (c == NULL)
171 errx(1, "malloc");
172
173 c->lineno = lineno;
174 (*next) = c;
175 next = &(c->next);
176
177 if ((str = iscmd(s, "expect ")) != NULL) {
178 c->type = CMD_EXPECT;
179 c->str = str;
180 } else if ((str = iscmd(s, "send ")) != NULL) {
181 c->type = CMD_SEND;
182 c->str = str;
183 } else if ((str = iscmd(s, "password ")) != NULL) {
184 c->type = CMD_PASSWORD;
185 c->str = str;
186 } else
187 errx(1, "Invalid command on line %d: %s", lineno, s);
188 }
189
190 fclose(cmd);
191}
192
193
194/*
195 *
196 */
197
198static int
199eval_parent(pid_t pid)
200{
201 struct command *c;
202 char in;
203 size_t len = 0;
204 ssize_t sret;
205
206 for (c = commands; c != NULL; c = c->next) {
207 switch(c->type) {
208 case CMD_EXPECT:
209 if (verbose)
210 printf("[expecting %s]", c->str);
211 len = 0;
212 alarm(timeout);
213 while((sret = read(master, &in, sizeof(in))) > 0) {
214 alarm(timeout);
215 printf("%c", in);
216 if (c->str[len] != in) {
217 len = 0;
218 continue;
219 }
220 len++;
221 if (c->str[len] == '\0')
222 break;
223 }
224 alarm(0);
225 if (alarmset == SIGALRM)
226 errx(1, "timeout waiting for %s (line %u)",
227 c->str, c->lineno);
228 else if (alarmset)
229 errx(1, "got a signal %d waiting for %s (line %u)",
230 alarmset, c->str, c->lineno);
231 if (sret <= 0)
232 errx(1, "end command while waiting for %s (line %u)",
233 c->str, c->lineno);
234 break;
235 case CMD_SEND:
236 case CMD_PASSWORD: {
237 size_t i = 0;
238 const char *msg = (c->type == CMD_PASSWORD) ? "****" : c->str;
239
240 if (verbose)
241 printf("[send %s]", msg);
242
243 len = strlen(c->str);
244
245 while (i < len) {
246 if (c->str[i] == '\\' && i < len - 1) {
247 char ctrl;
248 i++;
249 switch(c->str[i]) {
250 case 'n': ctrl = '\n'; break;
251 case 'r': ctrl = '\r'; break;
252 case 't': ctrl = '\t'; break;
253 default:
254 errx(1, "unknown control char %c (line %u)",
255 c->str[i], c->lineno);
256 }
257 if (net_write(master, &ctrl, 1) != 1)
258 errx(1, "command refused input (line %u)", c->lineno);
259 } else {
260 if (net_write(master, &c->str[i], 1) != 1)
261 errx(1, "command refused input (line %u)", c->lineno);
262 }
263 i++;
264 }
265 break;
266 }
267 default:
268 abort();
269 }
270 }
271 while(read(master, &in, sizeof(in)) > 0)
272 printf("%c", in);
273
274 if (verbose)
275 printf("[end of program]\n");
276
277 /*
278 * Fetch status from child
279 */
280 {
281 int ret, status;
282
283 ret = waitpid(pid, &status, 0);
284 if (ret == -1)
285 err(1, "waitpid");
286 if (WIFEXITED(status) && WEXITSTATUS(status))
287 return WEXITSTATUS(status);
288 else if (WIFSIGNALED(status)) {
289 printf("killed by signal: %d\n", WTERMSIG(status));
290 return 1;
291 }
292 }
293 return 0;
294}
295
296/*
297 *
298 */
299
300static struct getargs args[] = {
301 { "timeout", 't', arg_integer, &timeout, "timout", "seconds" },
302 { "verbose", 'v', arg_counter, &verbose, "verbose debugging" },
303 { "version", 0, arg_flag, &version_flag, "print version" },
304 { "help", 0, arg_flag, &help_flag, NULL }
305};
306
307static void
308usage(int ret)
309{
310 arg_printusage (args, sizeof(args)/sizeof(*args), NULL, "infile command..");
311 exit (ret);
312}
313
314int
315main(int argc, char **argv)
316{
317 int optidx = 0;
318 pid_t pid;
319
320 setprogname(argv[0]);
321
322 if(getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &optidx))
323 usage(1);
324
325 if (help_flag)
326 usage (0);
327
328 if (version_flag) {
329 fprintf (stderr, "%s from %s-%s\n", getprogname(), PACKAGE, VERSION);
330 return 0;
331 }
332
333 argv += optidx;
334 argc -= optidx;
335
336 if (argc < 2)
337 usage(1);
338
339 parse_configuration(argv[0]);
340
341 argv += 1;
342
343 open_pty();
344
345 pid = fork();
346 switch (pid) {
347 case -1:
348 err(1, "Failed to fork");
349 case 0:
350
351 if(setsid()<0)
352 err(1, "setsid");
353
354 dup2(slave, STDIN_FILENO);
355 dup2(slave, STDOUT_FILENO);
356 dup2(slave, STDERR_FILENO);
357 closefrom(STDERR_FILENO + 1);
358
359 execvp(argv[0], argv); /* add NULL to end of array ? */
360 err(1, "Failed to exec: %s", argv[0]);
361 default:
362 close(slave);
363 {
364 struct sigaction sa;
365
366 sa.sa_handler = caught_signal;
367 sa.sa_flags = 0;
368 sigemptyset (&sa.sa_mask);
369
370 sigaction(SIGALRM, &sa, NULL);
371 }
372
373 return eval_parent(pid);
374 }
375}
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