]> andersk Git - openssh.git/blame_incremental - scp.c
- markus@cvs.openbsd.org 2003/09/19 11:33:09
[openssh.git] / scp.c
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1/*
2 * scp - secure remote copy. This is basically patched BSD rcp which
3 * uses ssh to do the data transfer (instead of using rcmd).
4 *
5 * NOTE: This version should NOT be suid root. (This uses ssh to
6 * do the transfer and ssh has the necessary privileges.)
7 *
8 * 1995 Timo Rinne <tri@iki.fi>, Tatu Ylonen <ylo@cs.hut.fi>
9 *
10 * As far as I am concerned, the code I have written for this software
11 * can be used freely for any purpose. Any derived versions of this
12 * software must be clearly marked as such, and if the derived work is
13 * incompatible with the protocol description in the RFC file, it must be
14 * called by a name other than "ssh" or "Secure Shell".
15 */
16/*
17 * Copyright (c) 1999 Theo de Raadt. All rights reserved.
18 * Copyright (c) 1999 Aaron Campbell. All rights reserved.
19 *
20 * Redistribution and use in source and binary forms, with or without
21 * modification, are permitted provided that the following conditions
22 * are met:
23 * 1. Redistributions of source code must retain the above copyright
24 * notice, this list of conditions and the following disclaimer.
25 * 2. Redistributions in binary form must reproduce the above copyright
26 * notice, this list of conditions and the following disclaimer in the
27 * documentation and/or other materials provided with the distribution.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
30 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
31 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
32 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
33 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
34 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
38 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 */
40
41/*
42 * Parts from:
43 *
44 * Copyright (c) 1983, 1990, 1992, 1993, 1995
45 * The Regents of the University of California. All rights reserved.
46 *
47 * Redistribution and use in source and binary forms, with or without
48 * modification, are permitted provided that the following conditions
49 * are met:
50 * 1. Redistributions of source code must retain the above copyright
51 * notice, this list of conditions and the following disclaimer.
52 * 2. Redistributions in binary form must reproduce the above copyright
53 * notice, this list of conditions and the following disclaimer in the
54 * documentation and/or other materials provided with the distribution.
55 * 3. Neither the name of the University nor the names of its contributors
56 * may be used to endorse or promote products derived from this software
57 * without specific prior written permission.
58 *
59 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
62 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
69 * SUCH DAMAGE.
70 *
71 */
72
73#include "includes.h"
74RCSID("$OpenBSD: scp.c,v 1.108 2003/07/18 01:54:25 deraadt Exp $");
75
76#include "xmalloc.h"
77#include "atomicio.h"
78#include "pathnames.h"
79#include "log.h"
80#include "misc.h"
81#include "progressmeter.h"
82
83#ifdef HAVE___PROGNAME
84extern char *__progname;
85#else
86char *__progname;
87#endif
88
89void bwlimit(int);
90
91/* Struct for addargs */
92arglist args;
93
94/* Bandwidth limit */
95off_t limitbw = 0;
96
97/* Name of current file being transferred. */
98char *curfile;
99
100/* This is set to non-zero to enable verbose mode. */
101int verbose_mode = 0;
102
103/* This is set to zero if the progressmeter is not desired. */
104int showprogress = 1;
105
106/* This is the program to execute for the secured connection. ("ssh" or -S) */
107char *ssh_program = _PATH_SSH_PROGRAM;
108
109/* This is used to store the pid of ssh_program */
110pid_t do_cmd_pid = -1;
111
112static void
113killchild(int signo)
114{
115 if (do_cmd_pid > 1)
116 kill(do_cmd_pid, signo);
117
118 _exit(1);
119}
120
121/*
122 * This function executes the given command as the specified user on the
123 * given host. This returns < 0 if execution fails, and >= 0 otherwise. This
124 * assigns the input and output file descriptors on success.
125 */
126
127int
128do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout, int argc)
129{
130 int pin[2], pout[2], reserved[2];
131
132 if (verbose_mode)
133 fprintf(stderr,
134 "Executing: program %s host %s, user %s, command %s\n",
135 ssh_program, host,
136 remuser ? remuser : "(unspecified)", cmd);
137
138 /*
139 * Reserve two descriptors so that the real pipes won't get
140 * descriptors 0 and 1 because that will screw up dup2 below.
141 */
142 pipe(reserved);
143
144 /* Create a socket pair for communicating with ssh. */
145 if (pipe(pin) < 0)
146 fatal("pipe: %s", strerror(errno));
147 if (pipe(pout) < 0)
148 fatal("pipe: %s", strerror(errno));
149
150 /* Free the reserved descriptors. */
151 close(reserved[0]);
152 close(reserved[1]);
153
154 /* Fork a child to execute the command on the remote host using ssh. */
155 do_cmd_pid = fork();
156 if (do_cmd_pid == 0) {
157 /* Child. */
158 close(pin[1]);
159 close(pout[0]);
160 dup2(pin[0], 0);
161 dup2(pout[1], 1);
162 close(pin[0]);
163 close(pout[1]);
164
165 args.list[0] = ssh_program;
166 if (remuser != NULL)
167 addargs(&args, "-l%s", remuser);
168 addargs(&args, "%s", host);
169 addargs(&args, "%s", cmd);
170
171 execvp(ssh_program, args.list);
172 perror(ssh_program);
173 exit(1);
174 } else if (do_cmd_pid == -1) {
175 fatal("fork: %s", strerror(errno));
176 }
177 /* Parent. Close the other side, and return the local side. */
178 close(pin[0]);
179 *fdout = pin[1];
180 close(pout[1]);
181 *fdin = pout[0];
182 signal(SIGTERM, killchild);
183 signal(SIGINT, killchild);
184 signal(SIGHUP, killchild);
185 return 0;
186}
187
188typedef struct {
189 int cnt;
190 char *buf;
191} BUF;
192
193BUF *allocbuf(BUF *, int, int);
194void lostconn(int);
195void nospace(void);
196int okname(char *);
197void run_err(const char *,...);
198void verifydir(char *);
199
200struct passwd *pwd;
201uid_t userid;
202int errs, remin, remout;
203int pflag, iamremote, iamrecursive, targetshouldbedirectory;
204
205#define CMDNEEDS 64
206char cmd[CMDNEEDS]; /* must hold "rcp -r -p -d\0" */
207
208int response(void);
209void rsource(char *, struct stat *);
210void sink(int, char *[]);
211void source(int, char *[]);
212void tolocal(int, char *[]);
213void toremote(char *, int, char *[]);
214void usage(void);
215
216int
217main(int argc, char **argv)
218{
219 int ch, fflag, tflag, status;
220 double speed;
221 char *targ, *endp;
222 extern char *optarg;
223 extern int optind;
224
225 __progname = ssh_get_progname(argv[0]);
226
227 args.list = NULL;
228 addargs(&args, "ssh"); /* overwritten with ssh_program */
229 addargs(&args, "-x");
230 addargs(&args, "-oForwardAgent no");
231 addargs(&args, "-oClearAllForwardings yes");
232
233 fflag = tflag = 0;
234 while ((ch = getopt(argc, argv, "dfl:prtvBCc:i:P:q1246S:o:F:")) != -1)
235 switch (ch) {
236 /* User-visible flags. */
237 case '1':
238 case '2':
239 case '4':
240 case '6':
241 case 'C':
242 addargs(&args, "-%c", ch);
243 break;
244 case 'o':
245 case 'c':
246 case 'i':
247 case 'F':
248 addargs(&args, "-%c%s", ch, optarg);
249 break;
250 case 'P':
251 addargs(&args, "-p%s", optarg);
252 break;
253 case 'B':
254 addargs(&args, "-oBatchmode yes");
255 break;
256 case 'l':
257 speed = strtod(optarg, &endp);
258 if (speed <= 0 || *endp != '\0')
259 usage();
260 limitbw = speed * 1024;
261 break;
262 case 'p':
263 pflag = 1;
264 break;
265 case 'r':
266 iamrecursive = 1;
267 break;
268 case 'S':
269 ssh_program = xstrdup(optarg);
270 break;
271 case 'v':
272 addargs(&args, "-v");
273 verbose_mode = 1;
274 break;
275 case 'q':
276 showprogress = 0;
277 break;
278
279 /* Server options. */
280 case 'd':
281 targetshouldbedirectory = 1;
282 break;
283 case 'f': /* "from" */
284 iamremote = 1;
285 fflag = 1;
286 break;
287 case 't': /* "to" */
288 iamremote = 1;
289 tflag = 1;
290#ifdef HAVE_CYGWIN
291 setmode(0, O_BINARY);
292#endif
293 break;
294 default:
295 usage();
296 }
297 argc -= optind;
298 argv += optind;
299
300 if ((pwd = getpwuid(userid = getuid())) == NULL)
301 fatal("unknown user %u", (u_int) userid);
302
303 if (!isatty(STDERR_FILENO))
304 showprogress = 0;
305
306 remin = STDIN_FILENO;
307 remout = STDOUT_FILENO;
308
309 if (fflag) {
310 /* Follow "protocol", send data. */
311 (void) response();
312 source(argc, argv);
313 exit(errs != 0);
314 }
315 if (tflag) {
316 /* Receive data. */
317 sink(argc, argv);
318 exit(errs != 0);
319 }
320 if (argc < 2)
321 usage();
322 if (argc > 2)
323 targetshouldbedirectory = 1;
324
325 remin = remout = -1;
326 do_cmd_pid = -1;
327 /* Command to be executed on remote system using "ssh". */
328 (void) snprintf(cmd, sizeof cmd, "scp%s%s%s%s",
329 verbose_mode ? " -v" : "",
330 iamrecursive ? " -r" : "", pflag ? " -p" : "",
331 targetshouldbedirectory ? " -d" : "");
332
333 (void) signal(SIGPIPE, lostconn);
334
335 if ((targ = colon(argv[argc - 1]))) /* Dest is remote host. */
336 toremote(targ, argc, argv);
337 else {
338 tolocal(argc, argv); /* Dest is local host. */
339 if (targetshouldbedirectory)
340 verifydir(argv[argc - 1]);
341 }
342 /*
343 * Finally check the exit status of the ssh process, if one was forked
344 * and no error has occured yet
345 */
346 if (do_cmd_pid != -1 && errs == 0) {
347 if (remin != -1)
348 (void) close(remin);
349 if (remout != -1)
350 (void) close(remout);
351 if (waitpid(do_cmd_pid, &status, 0) == -1)
352 errs = 1;
353 else {
354 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
355 errs = 1;
356 }
357 }
358 exit(errs != 0);
359}
360
361void
362toremote(char *targ, int argc, char **argv)
363{
364 int i, len;
365 char *bp, *host, *src, *suser, *thost, *tuser;
366
367 *targ++ = 0;
368 if (*targ == 0)
369 targ = ".";
370
371 if ((thost = strrchr(argv[argc - 1], '@'))) {
372 /* user@host */
373 *thost++ = 0;
374 tuser = argv[argc - 1];
375 if (*tuser == '\0')
376 tuser = NULL;
377 } else {
378 thost = argv[argc - 1];
379 tuser = NULL;
380 }
381
382 for (i = 0; i < argc - 1; i++) {
383 src = colon(argv[i]);
384 if (src) { /* remote to remote */
385 static char *ssh_options =
386 "-x -o'ClearAllForwardings yes'";
387 *src++ = 0;
388 if (*src == 0)
389 src = ".";
390 host = strrchr(argv[i], '@');
391 len = strlen(ssh_program) + strlen(argv[i]) +
392 strlen(src) + (tuser ? strlen(tuser) : 0) +
393 strlen(thost) + strlen(targ) +
394 strlen(ssh_options) + CMDNEEDS + 20;
395 bp = xmalloc(len);
396 if (host) {
397 *host++ = 0;
398 host = cleanhostname(host);
399 suser = argv[i];
400 if (*suser == '\0')
401 suser = pwd->pw_name;
402 else if (!okname(suser)) {
403 xfree(bp);
404 continue;
405 }
406 if (tuser && !okname(tuser)) {
407 xfree(bp);
408 continue;
409 }
410 snprintf(bp, len,
411 "%s%s %s -n "
412 "-l %s %s %s %s '%s%s%s:%s'",
413 ssh_program, verbose_mode ? " -v" : "",
414 ssh_options, suser, host, cmd, src,
415 tuser ? tuser : "", tuser ? "@" : "",
416 thost, targ);
417 } else {
418 host = cleanhostname(argv[i]);
419 snprintf(bp, len,
420 "exec %s%s %s -n %s "
421 "%s %s '%s%s%s:%s'",
422 ssh_program, verbose_mode ? " -v" : "",
423 ssh_options, host, cmd, src,
424 tuser ? tuser : "", tuser ? "@" : "",
425 thost, targ);
426 }
427 if (verbose_mode)
428 fprintf(stderr, "Executing: %s\n", bp);
429 (void) system(bp);
430 (void) xfree(bp);
431 } else { /* local to remote */
432 if (remin == -1) {
433 len = strlen(targ) + CMDNEEDS + 20;
434 bp = xmalloc(len);
435 (void) snprintf(bp, len, "%s -t %s", cmd, targ);
436 host = cleanhostname(thost);
437 if (do_cmd(host, tuser, bp, &remin,
438 &remout, argc) < 0)
439 exit(1);
440 if (response() < 0)
441 exit(1);
442 (void) xfree(bp);
443 }
444 source(1, argv + i);
445 }
446 }
447}
448
449void
450tolocal(int argc, char **argv)
451{
452 int i, len;
453 char *bp, *host, *src, *suser;
454
455 for (i = 0; i < argc - 1; i++) {
456 if (!(src = colon(argv[i]))) { /* Local to local. */
457 len = strlen(_PATH_CP) + strlen(argv[i]) +
458 strlen(argv[argc - 1]) + 20;
459 bp = xmalloc(len);
460 (void) snprintf(bp, len, "exec %s%s%s %s %s", _PATH_CP,
461 iamrecursive ? " -r" : "", pflag ? " -p" : "",
462 argv[i], argv[argc - 1]);
463 if (verbose_mode)
464 fprintf(stderr, "Executing: %s\n", bp);
465 if (system(bp))
466 ++errs;
467 (void) xfree(bp);
468 continue;
469 }
470 *src++ = 0;
471 if (*src == 0)
472 src = ".";
473 if ((host = strrchr(argv[i], '@')) == NULL) {
474 host = argv[i];
475 suser = NULL;
476 } else {
477 *host++ = 0;
478 suser = argv[i];
479 if (*suser == '\0')
480 suser = pwd->pw_name;
481 }
482 host = cleanhostname(host);
483 len = strlen(src) + CMDNEEDS + 20;
484 bp = xmalloc(len);
485 (void) snprintf(bp, len, "%s -f %s", cmd, src);
486 if (do_cmd(host, suser, bp, &remin, &remout, argc) < 0) {
487 (void) xfree(bp);
488 ++errs;
489 continue;
490 }
491 xfree(bp);
492 sink(1, argv + argc - 1);
493 (void) close(remin);
494 remin = remout = -1;
495 }
496}
497
498void
499source(int argc, char **argv)
500{
501 struct stat stb;
502 static BUF buffer;
503 BUF *bp;
504 off_t i, amt, result, statbytes;
505 int fd, haderr, indx;
506 char *last, *name, buf[2048];
507 int len;
508
509 for (indx = 0; indx < argc; ++indx) {
510 name = argv[indx];
511 statbytes = 0;
512 len = strlen(name);
513 while (len > 1 && name[len-1] == '/')
514 name[--len] = '\0';
515 if (strchr(name, '\n') != NULL) {
516 run_err("%s: skipping, filename contains a newline",
517 name);
518 goto next;
519 }
520 if ((fd = open(name, O_RDONLY, 0)) < 0)
521 goto syserr;
522 if (fstat(fd, &stb) < 0) {
523syserr: run_err("%s: %s", name, strerror(errno));
524 goto next;
525 }
526 switch (stb.st_mode & S_IFMT) {
527 case S_IFREG:
528 break;
529 case S_IFDIR:
530 if (iamrecursive) {
531 rsource(name, &stb);
532 goto next;
533 }
534 /* FALLTHROUGH */
535 default:
536 run_err("%s: not a regular file", name);
537 goto next;
538 }
539 if ((last = strrchr(name, '/')) == NULL)
540 last = name;
541 else
542 ++last;
543 curfile = last;
544 if (pflag) {
545 /*
546 * Make it compatible with possible future
547 * versions expecting microseconds.
548 */
549 (void) snprintf(buf, sizeof buf, "T%lu 0 %lu 0\n",
550 (u_long) stb.st_mtime,
551 (u_long) stb.st_atime);
552 (void) atomicio(vwrite, remout, buf, strlen(buf));
553 if (response() < 0)
554 goto next;
555 }
556#define FILEMODEMASK (S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO)
557 snprintf(buf, sizeof buf, "C%04o %lld %s\n",
558 (u_int) (stb.st_mode & FILEMODEMASK),
559 (int64_t)stb.st_size, last);
560 if (verbose_mode) {
561 fprintf(stderr, "Sending file modes: %s", buf);
562 }
563 (void) atomicio(vwrite, remout, buf, strlen(buf));
564 if (response() < 0)
565 goto next;
566 if ((bp = allocbuf(&buffer, fd, 2048)) == NULL) {
567next: (void) close(fd);
568 continue;
569 }
570 if (showprogress)
571 start_progress_meter(curfile, stb.st_size, &statbytes);
572 /* Keep writing after an error so that we stay sync'd up. */
573 for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
574 amt = bp->cnt;
575 if (i + amt > stb.st_size)
576 amt = stb.st_size - i;
577 if (!haderr) {
578 result = atomicio(read, fd, bp->buf, amt);
579 if (result != amt)
580 haderr = result >= 0 ? EIO : errno;
581 }
582 if (haderr)
583 (void) atomicio(vwrite, remout, bp->buf, amt);
584 else {
585 result = atomicio(vwrite, remout, bp->buf, amt);
586 if (result != amt)
587 haderr = result >= 0 ? EIO : errno;
588 statbytes += result;
589 }
590 if (limitbw)
591 bwlimit(amt);
592 }
593 if (showprogress)
594 stop_progress_meter();
595
596 if (close(fd) < 0 && !haderr)
597 haderr = errno;
598 if (!haderr)
599 (void) atomicio(vwrite, remout, "", 1);
600 else
601 run_err("%s: %s", name, strerror(haderr));
602 (void) response();
603 }
604}
605
606void
607rsource(char *name, struct stat *statp)
608{
609 DIR *dirp;
610 struct dirent *dp;
611 char *last, *vect[1], path[1100];
612
613 if (!(dirp = opendir(name))) {
614 run_err("%s: %s", name, strerror(errno));
615 return;
616 }
617 last = strrchr(name, '/');
618 if (last == 0)
619 last = name;
620 else
621 last++;
622 if (pflag) {
623 (void) snprintf(path, sizeof(path), "T%lu 0 %lu 0\n",
624 (u_long) statp->st_mtime,
625 (u_long) statp->st_atime);
626 (void) atomicio(vwrite, remout, path, strlen(path));
627 if (response() < 0) {
628 closedir(dirp);
629 return;
630 }
631 }
632 (void) snprintf(path, sizeof path, "D%04o %d %.1024s\n",
633 (u_int) (statp->st_mode & FILEMODEMASK), 0, last);
634 if (verbose_mode)
635 fprintf(stderr, "Entering directory: %s", path);
636 (void) atomicio(vwrite, remout, path, strlen(path));
637 if (response() < 0) {
638 closedir(dirp);
639 return;
640 }
641 while ((dp = readdir(dirp)) != NULL) {
642 if (dp->d_ino == 0)
643 continue;
644 if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
645 continue;
646 if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path) - 1) {
647 run_err("%s/%s: name too long", name, dp->d_name);
648 continue;
649 }
650 (void) snprintf(path, sizeof path, "%s/%s", name, dp->d_name);
651 vect[0] = path;
652 source(1, vect);
653 }
654 (void) closedir(dirp);
655 (void) atomicio(vwrite, remout, "E\n", 2);
656 (void) response();
657}
658
659void
660bwlimit(int amount)
661{
662 static struct timeval bwstart, bwend;
663 static int lamt, thresh = 16384;
664 u_int64_t wait;
665 struct timespec ts, rm;
666
667 if (!timerisset(&bwstart)) {
668 gettimeofday(&bwstart, NULL);
669 return;
670 }
671
672 lamt += amount;
673 if (lamt < thresh)
674 return;
675
676 gettimeofday(&bwend, NULL);
677 timersub(&bwend, &bwstart, &bwend);
678 if (!timerisset(&bwend))
679 return;
680
681 lamt *= 8;
682 wait = (double)1000000L * lamt / limitbw;
683
684 bwstart.tv_sec = wait / 1000000L;
685 bwstart.tv_usec = wait % 1000000L;
686
687 if (timercmp(&bwstart, &bwend, >)) {
688 timersub(&bwstart, &bwend, &bwend);
689
690 /* Adjust the wait time */
691 if (bwend.tv_sec) {
692 thresh /= 2;
693 if (thresh < 2048)
694 thresh = 2048;
695 } else if (bwend.tv_usec < 100) {
696 thresh *= 2;
697 if (thresh > 32768)
698 thresh = 32768;
699 }
700
701 TIMEVAL_TO_TIMESPEC(&bwend, &ts);
702 while (nanosleep(&ts, &rm) == -1) {
703 if (errno != EINTR)
704 break;
705 ts = rm;
706 }
707 }
708
709 lamt = 0;
710 gettimeofday(&bwstart, NULL);
711}
712
713void
714sink(int argc, char **argv)
715{
716 static BUF buffer;
717 struct stat stb;
718 enum {
719 YES, NO, DISPLAYED
720 } wrerr;
721 BUF *bp;
722 off_t i, j;
723 int amt, count, exists, first, mask, mode, ofd, omode;
724 off_t size, statbytes;
725 int setimes, targisdir, wrerrno = 0;
726 char ch, *cp, *np, *targ, *why, *vect[1], buf[2048];
727 struct timeval tv[2];
728
729#define atime tv[0]
730#define mtime tv[1]
731#define SCREWUP(str) do { why = str; goto screwup; } while (0)
732
733 setimes = targisdir = 0;
734 mask = umask(0);
735 if (!pflag)
736 (void) umask(mask);
737 if (argc != 1) {
738 run_err("ambiguous target");
739 exit(1);
740 }
741 targ = *argv;
742 if (targetshouldbedirectory)
743 verifydir(targ);
744
745 (void) atomicio(vwrite, remout, "", 1);
746 if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
747 targisdir = 1;
748 for (first = 1;; first = 0) {
749 cp = buf;
750 if (atomicio(read, remin, cp, 1) <= 0)
751 return;
752 if (*cp++ == '\n')
753 SCREWUP("unexpected <newline>");
754 do {
755 if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
756 SCREWUP("lost connection");
757 *cp++ = ch;
758 } while (cp < &buf[sizeof(buf) - 1] && ch != '\n');
759 *cp = 0;
760
761 if (buf[0] == '\01' || buf[0] == '\02') {
762 if (iamremote == 0)
763 (void) atomicio(vwrite, STDERR_FILENO,
764 buf + 1, strlen(buf + 1));
765 if (buf[0] == '\02')
766 exit(1);
767 ++errs;
768 continue;
769 }
770 if (buf[0] == 'E') {
771 (void) atomicio(vwrite, remout, "", 1);
772 return;
773 }
774 if (ch == '\n')
775 *--cp = 0;
776
777 cp = buf;
778 if (*cp == 'T') {
779 setimes++;
780 cp++;
781 mtime.tv_sec = strtol(cp, &cp, 10);
782 if (!cp || *cp++ != ' ')
783 SCREWUP("mtime.sec not delimited");
784 mtime.tv_usec = strtol(cp, &cp, 10);
785 if (!cp || *cp++ != ' ')
786 SCREWUP("mtime.usec not delimited");
787 atime.tv_sec = strtol(cp, &cp, 10);
788 if (!cp || *cp++ != ' ')
789 SCREWUP("atime.sec not delimited");
790 atime.tv_usec = strtol(cp, &cp, 10);
791 if (!cp || *cp++ != '\0')
792 SCREWUP("atime.usec not delimited");
793 (void) atomicio(vwrite, remout, "", 1);
794 continue;
795 }
796 if (*cp != 'C' && *cp != 'D') {
797 /*
798 * Check for the case "rcp remote:foo\* local:bar".
799 * In this case, the line "No match." can be returned
800 * by the shell before the rcp command on the remote is
801 * executed so the ^Aerror_message convention isn't
802 * followed.
803 */
804 if (first) {
805 run_err("%s", cp);
806 exit(1);
807 }
808 SCREWUP("expected control record");
809 }
810 mode = 0;
811 for (++cp; cp < buf + 5; cp++) {
812 if (*cp < '0' || *cp > '7')
813 SCREWUP("bad mode");
814 mode = (mode << 3) | (*cp - '0');
815 }
816 if (*cp++ != ' ')
817 SCREWUP("mode not delimited");
818
819 for (size = 0; isdigit(*cp);)
820 size = size * 10 + (*cp++ - '0');
821 if (*cp++ != ' ')
822 SCREWUP("size not delimited");
823 if (targisdir) {
824 static char *namebuf;
825 static int cursize;
826 size_t need;
827
828 need = strlen(targ) + strlen(cp) + 250;
829 if (need > cursize) {
830 if (namebuf)
831 xfree(namebuf);
832 namebuf = xmalloc(need);
833 cursize = need;
834 }
835 (void) snprintf(namebuf, need, "%s%s%s", targ,
836 strcmp(targ, "/") ? "/" : "", cp);
837 np = namebuf;
838 } else
839 np = targ;
840 curfile = cp;
841 exists = stat(np, &stb) == 0;
842 if (buf[0] == 'D') {
843 int mod_flag = pflag;
844 if (exists) {
845 if (!S_ISDIR(stb.st_mode)) {
846 errno = ENOTDIR;
847 goto bad;
848 }
849 if (pflag)
850 (void) chmod(np, mode);
851 } else {
852 /* Handle copying from a read-only
853 directory */
854 mod_flag = 1;
855 if (mkdir(np, mode | S_IRWXU) < 0)
856 goto bad;
857 }
858 vect[0] = xstrdup(np);
859 sink(1, vect);
860 if (setimes) {
861 setimes = 0;
862 if (utimes(vect[0], tv) < 0)
863 run_err("%s: set times: %s",
864 vect[0], strerror(errno));
865 }
866 if (mod_flag)
867 (void) chmod(vect[0], mode);
868 if (vect[0])
869 xfree(vect[0]);
870 continue;
871 }
872 omode = mode;
873 mode |= S_IWRITE;
874 if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
875bad: run_err("%s: %s", np, strerror(errno));
876 continue;
877 }
878 (void) atomicio(vwrite, remout, "", 1);
879 if ((bp = allocbuf(&buffer, ofd, 4096)) == NULL) {
880 (void) close(ofd);
881 continue;
882 }
883 cp = bp->buf;
884 wrerr = NO;
885
886 statbytes = 0;
887 if (showprogress)
888 start_progress_meter(curfile, size, &statbytes);
889 for (count = i = 0; i < size; i += 4096) {
890 amt = 4096;
891 if (i + amt > size)
892 amt = size - i;
893 count += amt;
894 do {
895 j = read(remin, cp, amt);
896 if (j == -1 && (errno == EINTR ||
897 errno == EAGAIN)) {
898 continue;
899 } else if (j <= 0) {
900 run_err("%s", j ? strerror(errno) :
901 "dropped connection");
902 exit(1);
903 }
904 amt -= j;
905 cp += j;
906 statbytes += j;
907 } while (amt > 0);
908
909 if (limitbw)
910 bwlimit(4096);
911
912 if (count == bp->cnt) {
913 /* Keep reading so we stay sync'd up. */
914 if (wrerr == NO) {
915 j = atomicio(vwrite, ofd, bp->buf, count);
916 if (j != count) {
917 wrerr = YES;
918 wrerrno = j >= 0 ? EIO : errno;
919 }
920 }
921 count = 0;
922 cp = bp->buf;
923 }
924 }
925 if (showprogress)
926 stop_progress_meter();
927 if (count != 0 && wrerr == NO &&
928 (j = atomicio(vwrite, ofd, bp->buf, count)) != count) {
929 wrerr = YES;
930 wrerrno = j >= 0 ? EIO : errno;
931 }
932 if (wrerr == NO && ftruncate(ofd, size) != 0) {
933 run_err("%s: truncate: %s", np, strerror(errno));
934 wrerr = DISPLAYED;
935 }
936 if (pflag) {
937 if (exists || omode != mode)
938#ifdef HAVE_FCHMOD
939 if (fchmod(ofd, omode))
940#else /* HAVE_FCHMOD */
941 if (chmod(np, omode))
942#endif /* HAVE_FCHMOD */
943 run_err("%s: set mode: %s",
944 np, strerror(errno));
945 } else {
946 if (!exists && omode != mode)
947#ifdef HAVE_FCHMOD
948 if (fchmod(ofd, omode & ~mask))
949#else /* HAVE_FCHMOD */
950 if (chmod(np, omode & ~mask))
951#endif /* HAVE_FCHMOD */
952 run_err("%s: set mode: %s",
953 np, strerror(errno));
954 }
955 if (close(ofd) == -1) {
956 wrerr = YES;
957 wrerrno = errno;
958 }
959 (void) response();
960 if (setimes && wrerr == NO) {
961 setimes = 0;
962 if (utimes(np, tv) < 0) {
963 run_err("%s: set times: %s",
964 np, strerror(errno));
965 wrerr = DISPLAYED;
966 }
967 }
968 switch (wrerr) {
969 case YES:
970 run_err("%s: %s", np, strerror(wrerrno));
971 break;
972 case NO:
973 (void) atomicio(vwrite, remout, "", 1);
974 break;
975 case DISPLAYED:
976 break;
977 }
978 }
979screwup:
980 run_err("protocol error: %s", why);
981 exit(1);
982}
983
984int
985response(void)
986{
987 char ch, *cp, resp, rbuf[2048];
988
989 if (atomicio(read, remin, &resp, sizeof(resp)) != sizeof(resp))
990 lostconn(0);
991
992 cp = rbuf;
993 switch (resp) {
994 case 0: /* ok */
995 return (0);
996 default:
997 *cp++ = resp;
998 /* FALLTHROUGH */
999 case 1: /* error, followed by error msg */
1000 case 2: /* fatal error, "" */
1001 do {
1002 if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
1003 lostconn(0);
1004 *cp++ = ch;
1005 } while (cp < &rbuf[sizeof(rbuf) - 1] && ch != '\n');
1006
1007 if (!iamremote)
1008 (void) atomicio(vwrite, STDERR_FILENO, rbuf, cp - rbuf);
1009 ++errs;
1010 if (resp == 1)
1011 return (-1);
1012 exit(1);
1013 }
1014 /* NOTREACHED */
1015}
1016
1017void
1018usage(void)
1019{
1020 (void) fprintf(stderr,
1021 "usage: scp [-pqrvBC1246] [-F config] [-S program] [-P port]\n"
1022 " [-c cipher] [-i identity] [-l limit] [-o option]\n"
1023 " [[user@]host1:]file1 [...] [[user@]host2:]file2\n");
1024 exit(1);
1025}
1026
1027void
1028run_err(const char *fmt,...)
1029{
1030 static FILE *fp;
1031 va_list ap;
1032
1033 ++errs;
1034 if (fp == NULL && !(fp = fdopen(remout, "w")))
1035 return;
1036 (void) fprintf(fp, "%c", 0x01);
1037 (void) fprintf(fp, "scp: ");
1038 va_start(ap, fmt);
1039 (void) vfprintf(fp, fmt, ap);
1040 va_end(ap);
1041 (void) fprintf(fp, "\n");
1042 (void) fflush(fp);
1043
1044 if (!iamremote) {
1045 va_start(ap, fmt);
1046 vfprintf(stderr, fmt, ap);
1047 va_end(ap);
1048 fprintf(stderr, "\n");
1049 }
1050}
1051
1052void
1053verifydir(char *cp)
1054{
1055 struct stat stb;
1056
1057 if (!stat(cp, &stb)) {
1058 if (S_ISDIR(stb.st_mode))
1059 return;
1060 errno = ENOTDIR;
1061 }
1062 run_err("%s: %s", cp, strerror(errno));
1063 exit(1);
1064}
1065
1066int
1067okname(char *cp0)
1068{
1069 int c;
1070 char *cp;
1071
1072 cp = cp0;
1073 do {
1074 c = (int)*cp;
1075 if (c & 0200)
1076 goto bad;
1077 if (!isalpha(c) && !isdigit(c)) {
1078 switch (c) {
1079 case '\'':
1080 case '"':
1081 case '`':
1082 case ' ':
1083 case '#':
1084 goto bad;
1085 default:
1086 break;
1087 }
1088 }
1089 } while (*++cp);
1090 return (1);
1091
1092bad: fprintf(stderr, "%s: invalid user name\n", cp0);
1093 return (0);
1094}
1095
1096BUF *
1097allocbuf(BUF *bp, int fd, int blksize)
1098{
1099 size_t size;
1100#ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
1101 struct stat stb;
1102
1103 if (fstat(fd, &stb) < 0) {
1104 run_err("fstat: %s", strerror(errno));
1105 return (0);
1106 }
1107 size = roundup(stb.st_blksize, blksize);
1108 if (size == 0)
1109 size = blksize;
1110#else /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1111 size = blksize;
1112#endif /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1113 if (bp->cnt >= size)
1114 return (bp);
1115 if (bp->buf == NULL)
1116 bp->buf = xmalloc(size);
1117 else
1118 bp->buf = xrealloc(bp->buf, size);
1119 memset(bp->buf, 0, size);
1120 bp->cnt = size;
1121 return (bp);
1122}
1123
1124void
1125lostconn(int signo)
1126{
1127 if (!iamremote)
1128 write(STDERR_FILENO, "lost connection\n", 16);
1129 if (signo)
1130 _exit(1);
1131 else
1132 exit(1);
1133}
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