summaryrefslogtreecommitdiff
path: root/sftp-int.c
blob: 9c3ebe5bf9c046b333ee8162c74578dbbb7d8329 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
/*
 * Copyright (c) 2001 Damien Miller.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/* XXX: finish implementation of all commands */
/* XXX: do fnmatch() instead of using raw pathname */
/* XXX: globbed ls */
/* XXX: recursive operations */

#include "includes.h"
RCSID("$OpenBSD: sftp-int.c,v 1.20 2001/02/10 00:45:26 djm Exp $");

#include "buffer.h"
#include "xmalloc.h"
#include "log.h"
#include "pathnames.h"

#include "sftp.h"
#include "sftp-common.h"
#include "sftp-client.h"
#include "sftp-int.h"

/* Seperators for interactive commands */
#define WHITESPACE " \t\r\n"

/* Commands for interactive mode */
#define I_CHDIR		1
#define I_CHGRP		2
#define I_CHMOD		3
#define I_CHOWN		4
#define I_GET		5
#define I_HELP		6
#define I_LCHDIR	7
#define I_LLS		8
#define I_LMKDIR	9
#define I_LPWD		10
#define I_LS		11
#define I_LUMASK	12
#define I_MKDIR		13
#define I_PUT		14
#define I_PWD		15
#define I_QUIT		16
#define I_RENAME	17
#define I_RM		18
#define I_RMDIR		19
#define I_SHELL		20

struct CMD {
	const char *c;
	const int n;
};

const struct CMD cmds[] = {
	{ "cd",		I_CHDIR },
	{ "chdir",	I_CHDIR },
	{ "chgrp",	I_CHGRP },
	{ "chmod",	I_CHMOD },
	{ "chown",	I_CHOWN },
	{ "dir",	I_LS },
	{ "exit",	I_QUIT },
	{ "get",	I_GET },
	{ "help",	I_HELP },
	{ "lcd",	I_LCHDIR },
	{ "lchdir",	I_LCHDIR },
	{ "lls",	I_LLS },
	{ "lmkdir",	I_LMKDIR },
	{ "lpwd",	I_LPWD },
	{ "ls",		I_LS },
	{ "lumask",	I_LUMASK },
	{ "mkdir",	I_MKDIR },
	{ "put",	I_PUT },
	{ "pwd",	I_PWD },
	{ "quit",	I_QUIT },
	{ "rename",	I_RENAME },
	{ "rm",		I_RM },
	{ "rmdir",	I_RMDIR },
	{ "!",		I_SHELL },
	{ "?",		I_HELP },
	{ NULL,			-1}
};

void
help(void)
{
	printf("Available commands:\n");
	printf("cd path                       Change remote directory to 'path'\n");
	printf("lcd path                      Change local directory to 'path'\n");
	printf("chgrp grp path                Change group of file 'path' to 'grp'\n");
	printf("chmod mode path               Change permissions of file 'path' to 'mode'\n");
	printf("chown own path                Change owner of file 'path' to 'own'\n");
	printf("help                          Display this help text\n");
	printf("get remote-path [local-path]  Download file\n");
	printf("lls [ls-options [path]]       Display local directory listing\n");
	printf("lmkdir path                   Create local directory\n");
	printf("lpwd                          Print local working directory\n");
	printf("ls [path]                     Display remote directory listing\n");
	printf("lumask umask                  Set local umask to 'umask'\n");
	printf("mkdir path                    Create remote directory\n");
	printf("put local-path [remote-path]  Upload file\n");
	printf("pwd                           Display remote working directory\n");
	printf("exit                          Quit sftp\n");
	printf("quit                          Quit sftp\n");
	printf("rename oldpath newpath        Rename remote file\n");
	printf("rmdir path                    Remove remote directory\n");
	printf("rm path                       Delete remote file\n");
	printf("!command                      Execute 'command' in local shell\n");
	printf("!                             Escape to local shell\n");
	printf("?                             Synonym for help\n");
}

void
local_do_shell(const char *args)
{
	int ret, status;
	char *shell;
	pid_t pid;

	if (!*args)
		args = NULL;

	if ((shell = getenv("SHELL")) == NULL)
		shell = _PATH_BSHELL;

	if ((pid = fork()) == -1)
		fatal("Couldn't fork: %s", strerror(errno));

	if (pid == 0) {
		/* XXX: child has pipe fds to ssh subproc open - issue? */
		if (args) {
			debug3("Executing %s -c \"%s\"", shell, args);
			ret = execl(shell, shell, "-c", args, NULL);
		} else {
			debug3("Executing %s", shell);
			ret = execl(shell, shell, NULL);
		}
		fprintf(stderr, "Couldn't execute \"%s\": %s\n", shell,
		    strerror(errno));
		_exit(1);
	}
	if (waitpid(pid, &status, 0) == -1)
		fatal("Couldn't wait for child: %s", strerror(errno));
	if (!WIFEXITED(status))
		error("Shell exited abormally");
	else if (WEXITSTATUS(status))
		error("Shell exited with status %d", WEXITSTATUS(status));
}

void
local_do_ls(const char *args)
{
	if (!args || !*args)
		local_do_shell(_PATH_LS);
	else {
		int len = strlen(_PATH_LS " ") + strlen(args) + 1;
		char *buf = xmalloc(len);

		/* XXX: quoting - rip quoting code from ftp? */
		snprintf(buf, len, _PATH_LS " %s", args);
		local_do_shell(buf);
		xfree(buf);
	}
}

char *
make_absolute(char *p, char *pwd)
{
	char buf[2048];

	/* Derelativise */
	if (p && p[0] != '/') {
		snprintf(buf, sizeof(buf), "%s/%s", pwd, p);
		xfree(p);
		p = xstrdup(buf);
	}

	return(p);
}

int
parse_getput_flags(const char **cpp, int *pflag)
{
	const char *cp = *cpp;

	/* Check for flags */
	if (cp[0] == '-' && cp[1] && strchr(WHITESPACE, cp[2])) {
		switch (cp[1]) {
		case 'P':
			*pflag = 1;
			break;
		default:
			error("Invalid flag -%c", *cp);
			return(-1);
		}
		cp += 2;
		*cpp = cp + strspn(cp, WHITESPACE);
	}

	return(0);
}

int
get_pathname(const char **cpp, char **path)
{
	const char *cp = *cpp, *end;
	char quot;
	int i;

	cp += strspn(cp, WHITESPACE);
	if (!*cp) {
		*cpp = cp;
		*path = NULL;
		return (0);
	}

	/* Check for quoted filenames */
	if (*cp == '\"' || *cp == '\'') {
		quot = *cp++;
		
		end = strchr(cp, quot);
		if (end == NULL) {
			error("Unterminated quote");
			goto fail;
		}
		if (cp == end) {
			error("Empty quotes");
			goto fail;
		}
		*cpp = end + 1 + strspn(end + 1, WHITESPACE);
	} else {
		/* Read to end of filename */
		end = strpbrk(cp, WHITESPACE);
		if (end == NULL)
			end = strchr(cp, '\0');
		*cpp = end + strspn(end, WHITESPACE);
	}

	i = end - cp;

	*path = xmalloc(i + 1);
	memcpy(*path, cp, i);
	(*path)[i] = '\0';
	return(0);

 fail:
	*path = NULL;
	return (-1);
}

int
infer_path(const char *p, char **ifp)
{
	char *cp;

	debug("XXX: P = \"%s\"", p);

	cp = strrchr(p, '/');
	if (cp == NULL) {
		*ifp = xstrdup(p);
		return(0);
	}

	if (!cp[1]) {
		error("Invalid path");
		return(-1);
	}

	*ifp = xstrdup(cp + 1);
	return(0);
}

int
parse_args(const char **cpp, int *pflag, unsigned long *n_arg,
    char **path1, char **path2)
{
	const char *cmd, *cp = *cpp;
	int base = 0;
	int i, cmdnum;

	/* Skip leading whitespace */
	cp = cp + strspn(cp, WHITESPACE);

	/* Ignore blank lines */
	if (!*cp)
		return(-1);

	/* Figure out which command we have */
	for(i = 0; cmds[i].c; i++) {
		int cmdlen = strlen(cmds[i].c);

		/* Check for command followed by whitespace */
		if (!strncasecmp(cp, cmds[i].c, cmdlen) &&
		    strchr(WHITESPACE, cp[cmdlen])) {
			cp += cmdlen;
			cp = cp + strspn(cp, WHITESPACE);
			break;
		}
	}
	cmdnum = cmds[i].n;
	cmd = cmds[i].c;

	/* Special case */
	if (*cp == '!') {
		cp++;
		cmdnum = I_SHELL;
	} else if (cmdnum == -1) {
		error("Invalid command.");
		return(-1);
	}

	/* Get arguments and parse flags */
	*pflag = *n_arg = 0;
	*path1 = *path2 = NULL;
	switch (cmdnum) {
	case I_GET:
	case I_PUT:
		if (parse_getput_flags(&cp, pflag))
			return(-1);
		/* Get first pathname (mandatory) */
		if (get_pathname(&cp, path1))
			return(-1);
		if (*path1 == NULL) {
			error("You must specify at least one path after a "
			    "%s command.", cmd);
			return(-1);
		}
		/* Try to get second pathname (optional) */
		if (get_pathname(&cp, path2))
			return(-1);
		/* Otherwise try to guess it from first path */
		if (*path2 == NULL && infer_path(*path1, path2))
			return(-1);
		break;
	case I_RENAME:
		/* Get first pathname (mandatory) */
		if (get_pathname(&cp, path1))
			return(-1);
		if (get_pathname(&cp, path2))
			return(-1);
		if (!*path1 || !*path2) {
			error("You must specify two paths after a %s "
			    "command.", cmd);
			return(-1);
		}
		break;
	case I_RM:
	case I_MKDIR:
	case I_RMDIR:
	case I_CHDIR:
	case I_LCHDIR:
	case I_LMKDIR:
		/* Get pathname (mandatory) */
		if (get_pathname(&cp, path1))
			return(-1);
		if (*path1 == NULL) {
			error("You must specify a path after a %s command.",
			    cmd);
			return(-1);
		}
		break;
	case I_LS:
		/* Path is optional */
		if (get_pathname(&cp, path1))
			return(-1);
		break;
	case I_LLS:
	case I_SHELL:
		/* Uses the rest of the line */
		break;
	case I_LUMASK:
	case I_CHMOD:
		base = 8;
	case I_CHOWN:
	case I_CHGRP:
		/* Get numeric arg (mandatory) */
		if (*cp < '0' && *cp > '9') {
			error("You must supply a numeric argument "
			    "to the %s command.", cmd);
			return(-1);
		}
		*n_arg = strtoul(cp, (char**)&cp, base);
		if (!*cp || !strchr(WHITESPACE, *cp)) {
			error("You must supply a numeric argument "
			    "to the %s command.", cmd);
			return(-1);
		}
		cp += strspn(cp, WHITESPACE);

		/* Get pathname (mandatory) */
		if (get_pathname(&cp, path1))
			return(-1);
		if (*path1 == NULL) {
			error("You must specify a path after a %s command.",
			    cmd);
			return(-1);
		}
		break;
	case I_QUIT:
	case I_PWD:
	case I_LPWD:
	case I_HELP:
		break;
	default:
		fatal("Command not implemented");
	}

	*cpp = cp;
	return(cmdnum);
}

int
parse_dispatch_command(int in, int out, const char *cmd, char **pwd)
{
	char *path1, *path2, *tmp;
	int pflag, cmdnum;
	unsigned long n_arg;
	Attrib a, *aa;
	char path_buf[PATH_MAX];

	path1 = path2 = NULL;
	cmdnum = parse_args(&cmd, &pflag, &n_arg, &path1, &path2);

	/* Perform command */
	switch (cmdnum) {
	case -1:
		break;
	case I_GET:
		path1 = make_absolute(path1, *pwd);
		do_download(in, out, path1, path2, pflag);
		break;
	case I_PUT:
		path2 = make_absolute(path2, *pwd);
		do_upload(in, out, path1, path2, pflag);
		break;
	case I_RENAME:
		path1 = make_absolute(path1, *pwd);
		path2 = make_absolute(path2, *pwd);
		do_rename(in, out, path1, path2);
		break;
	case I_RM:
		path1 = make_absolute(path1, *pwd);
		do_rm(in, out, path1);
		break;
	case I_MKDIR:
		path1 = make_absolute(path1, *pwd);
		attrib_clear(&a);
		a.flags |= SSH2_FILEXFER_ATTR_PERMISSIONS;
		a.perm = 0777;
		do_mkdir(in, out, path1, &a);
		break;
	case I_RMDIR:
		path1 = make_absolute(path1, *pwd);
		do_rmdir(in, out, path1);
		break;
	case I_CHDIR:
		path1 = make_absolute(path1, *pwd);
		if ((tmp = do_realpath(in, out, path1)) == NULL)
			break;
		if ((aa = do_stat(in, out, tmp)) == NULL) {
			xfree(tmp);
			break;
		}
		if (!(aa->flags & SSH2_FILEXFER_ATTR_PERMISSIONS)) {
			error("Can't change directory: Can't check target");
			xfree(tmp);
			break;
		}
		if (!S_ISDIR(aa->perm)) {
			error("Can't change directory: \"%s\" is not "
			    "a directory", tmp);
			xfree(tmp);
			break;
		}
		xfree(*pwd);
		*pwd = tmp;
		break;
	case I_LS:
		if (!path1) {
			do_ls(in, out, *pwd);
			break;
		}
		path1 = make_absolute(path1, *pwd);
		if ((tmp = do_realpath(in, out, path1)) == NULL)
			break;
		xfree(path1);
		path1 = tmp;
		if ((aa = do_stat(in, out, path1)) == NULL)
			break;
		if ((aa->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) && 
		    !S_ISDIR(aa->perm)) {
			error("Can't ls: \"%s\" is not a directory", path1);
			break;
		}
		do_ls(in, out, path1);
		break;
	case I_LCHDIR:
		if (chdir(path1) == -1)
			error("Couldn't change local directory to "
			    "\"%s\": %s", path1, strerror(errno));
		break;
	case I_LMKDIR:
		if (mkdir(path1, 0777) == -1)
			error("Couldn't create local directory "
			    "\"%s\": %s", path1, strerror(errno));
		break;
	case I_LLS:
		local_do_ls(cmd);
		break;
	case I_SHELL:
		local_do_shell(cmd);
		break;
	case I_LUMASK:
		umask(n_arg);
		break;
	case I_CHMOD:
		path1 = make_absolute(path1, *pwd);
		attrib_clear(&a);
		a.flags |= SSH2_FILEXFER_ATTR_PERMISSIONS;
		a.perm = n_arg;
		do_setstat(in, out, path1, &a);
		break;
	case I_CHOWN:
		path1 = make_absolute(path1, *pwd);
		if (!(aa = do_stat(in, out, path1)))
			break;
		if (!(aa->flags & SSH2_FILEXFER_ATTR_UIDGID)) {
			error("Can't get current ownership of "
			    "remote file \"%s\"", path1);
			break;
		}
		aa->flags &= SSH2_FILEXFER_ATTR_UIDGID;
		aa->uid = n_arg;
		do_setstat(in, out, path1, aa);
		break;
	case I_CHGRP:
		path1 = make_absolute(path1, *pwd);
		if (!(aa = do_stat(in, out, path1)))
			break;
		if (!(aa->flags & SSH2_FILEXFER_ATTR_UIDGID)) {
			error("Can't get current ownership of "
			    "remote file \"%s\"", path1);
			break;
		}
		aa->flags &= SSH2_FILEXFER_ATTR_UIDGID;
		aa->gid = n_arg;
		do_setstat(in, out, path1, aa);
		break;
	case I_PWD:
		printf("Remote working directory: %s\n", *pwd);
		break;
	case I_LPWD:
		if (!getcwd(path_buf, sizeof(path_buf)))
			error("Couldn't get local cwd: %s\n",
			    strerror(errno));
		else
			printf("Local working directory: %s\n",
			    path_buf);
		break;
	case I_QUIT:
		return(-1);
	case I_HELP:
		help();
		break;
	default:
		fatal("%d is not implemented", cmdnum);
	}

	if (path1)
		xfree(path1);
	if (path2)
		xfree(path2);
	return(0);
}

void
interactive_loop(int fd_in, int fd_out)
{
	char *pwd;
	char cmd[2048];

	pwd = do_realpath(fd_in, fd_out, ".");
	if (pwd == NULL)
		fatal("Need cwd");

	setvbuf(stdout, NULL, _IOLBF, 0);
	setvbuf(stdin, NULL, _IOLBF, 0);

	for(;;) {
		char *cp;

		printf("sftp> ");

		/* XXX: use libedit */
		if (fgets(cmd, sizeof(cmd), stdin) == NULL) {
			printf("\n");
			break;
		}
		cp = strrchr(cmd, '\n');
		if (cp)
			*cp = '\0';
		if (parse_dispatch_command(fd_in, fd_out, cmd, &pwd))
			break;
	}
	xfree(pwd);
}