]> andersk Git - gssapi-openssh.git/blob - openssh/scp.c
added note that we added GT 3.2b compatibility in this release
[gssapi-openssh.git] / openssh / scp.c
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"
74 RCSID("$OpenBSD: scp.c,v 1.113 2003/11/23 23:21:21 djm 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
84 extern char *__progname;
85 #else
86 char *__progname;
87 #endif
88
89 void bwlimit(int);
90
91 /* Struct for addargs */
92 arglist args;
93
94 /* Bandwidth limit */
95 off_t limit_rate = 0;
96
97 /* Name of current file being transferred. */
98 char *curfile;
99
100 /* This is set to non-zero to enable verbose mode. */
101 int verbose_mode = 0;
102
103 /* This is set to zero if the progressmeter is not desired. */
104 int showprogress = 1;
105
106 /* This is the program to execute for the secured connection. ("ssh" or -S) */
107 char *ssh_program;
108
109 /* This is used to store the pid of ssh_program */
110 pid_t do_cmd_pid = -1;
111
112 static void
113 killchild(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
127 int
128 do_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
188 typedef struct {
189         int cnt;
190         char *buf;
191 } BUF;
192
193 BUF *allocbuf(BUF *, int, int);
194 void lostconn(int);
195 void nospace(void);
196 int okname(char *);
197 void run_err(const char *,...);
198 void verifydir(char *);
199
200 struct passwd *pwd;
201 uid_t userid;
202 int errs, remin, remout;
203 int pflag, iamremote, iamrecursive, targetshouldbedirectory;
204
205 #define CMDNEEDS        64
206 char cmd[CMDNEEDS];             /* must hold "rcp -r -p -d\0" */
207
208 int response(void);
209 void rsource(char *, struct stat *);
210 void sink(int, char *[]);
211 void source(int, char *[]);
212 void tolocal(int, char *[]);
213 void toremote(char *, int, char *[]);
214 void usage(void);
215
216 int
217 main(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         init_pathnames();
227         ssh_program = _PATH_SSH_PROGRAM;
228
229         args.list = NULL;
230         addargs(&args, "ssh");          /* overwritten with ssh_program */
231         addargs(&args, "-x");
232         addargs(&args, "-oForwardAgent no");
233         addargs(&args, "-oClearAllForwardings yes");
234
235         fflag = tflag = 0;
236         while ((ch = getopt(argc, argv, "dfl:prtvBCc:i:P:q1246S:o:F:")) != -1)
237                 switch (ch) {
238                 /* User-visible flags. */
239                 case '1':
240                 case '2':
241                 case '4':
242                 case '6':
243                 case 'C':
244                         addargs(&args, "-%c", ch);
245                         break;
246                 case 'o':
247                 case 'c':
248                 case 'i':
249                 case 'F':
250                         addargs(&args, "-%c%s", ch, optarg);
251                         break;
252                 case 'P':
253                         addargs(&args, "-p%s", optarg);
254                         break;
255                 case 'B':
256                         addargs(&args, "-oBatchmode yes");
257                         break;
258                 case 'l':
259                         speed = strtod(optarg, &endp);
260                         if (speed <= 0 || *endp != '\0')
261                                 usage();
262                         limit_rate = speed * 1024;
263                         break;
264                 case 'p':
265                         pflag = 1;
266                         break;
267                 case 'r':
268                         iamrecursive = 1;
269                         break;
270                 case 'S':
271                         ssh_program = xstrdup(optarg);
272                         break;
273                 case 'v':
274                         addargs(&args, "-v");
275                         verbose_mode = 1;
276                         break;
277                 case 'q':
278                         addargs(&args, "-q");
279                         showprogress = 0;
280                         break;
281
282                 /* Server options. */
283                 case 'd':
284                         targetshouldbedirectory = 1;
285                         break;
286                 case 'f':       /* "from" */
287                         iamremote = 1;
288                         fflag = 1;
289                         break;
290                 case 't':       /* "to" */
291                         iamremote = 1;
292                         tflag = 1;
293 #ifdef HAVE_CYGWIN
294                         setmode(0, O_BINARY);
295 #endif
296                         break;
297                 default:
298                         usage();
299                 }
300         argc -= optind;
301         argv += optind;
302
303         if ((pwd = getpwuid(userid = getuid())) == NULL)
304                 fatal("unknown user %u", (u_int) userid);
305
306         if (!isatty(STDERR_FILENO))
307                 showprogress = 0;
308
309         remin = STDIN_FILENO;
310         remout = STDOUT_FILENO;
311
312         if (fflag) {
313                 /* Follow "protocol", send data. */
314                 (void) response();
315                 source(argc, argv);
316                 exit(errs != 0);
317         }
318         if (tflag) {
319                 /* Receive data. */
320                 sink(argc, argv);
321                 exit(errs != 0);
322         }
323         if (argc < 2)
324                 usage();
325         if (argc > 2)
326                 targetshouldbedirectory = 1;
327
328         remin = remout = -1;
329         do_cmd_pid = -1;
330         /* Command to be executed on remote system using "ssh". */
331         (void) snprintf(cmd, sizeof cmd, "scp%s%s%s%s",
332             verbose_mode ? " -v" : "",
333             iamrecursive ? " -r" : "", pflag ? " -p" : "",
334             targetshouldbedirectory ? " -d" : "");
335
336         (void) signal(SIGPIPE, lostconn);
337
338         if ((targ = colon(argv[argc - 1])))     /* Dest is remote host. */
339                 toremote(targ, argc, argv);
340         else {
341                 tolocal(argc, argv);    /* Dest is local host. */
342                 if (targetshouldbedirectory)
343                         verifydir(argv[argc - 1]);
344         }
345         /*
346          * Finally check the exit status of the ssh process, if one was forked
347          * and no error has occured yet
348          */
349         if (do_cmd_pid != -1 && errs == 0) {
350                 if (remin != -1)
351                     (void) close(remin);
352                 if (remout != -1)
353                     (void) close(remout);
354                 if (waitpid(do_cmd_pid, &status, 0) == -1)
355                         errs = 1;
356                 else {
357                         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
358                                 errs = 1;
359                 }
360         }
361         exit(errs != 0);
362 }
363
364 void
365 toremote(char *targ, int argc, char **argv)
366 {
367         int i, len;
368         char *bp, *host, *src, *suser, *thost, *tuser;
369
370         *targ++ = 0;
371         if (*targ == 0)
372                 targ = ".";
373
374         if ((thost = strrchr(argv[argc - 1], '@'))) {
375                 /* user@host */
376                 *thost++ = 0;
377                 tuser = argv[argc - 1];
378                 if (*tuser == '\0')
379                         tuser = NULL;
380         } else {
381                 thost = argv[argc - 1];
382                 tuser = NULL;
383         }
384
385         for (i = 0; i < argc - 1; i++) {
386                 src = colon(argv[i]);
387                 if (src) {      /* remote to remote */
388                         static char *ssh_options =
389                             "-x -o'ClearAllForwardings yes'";
390                         *src++ = 0;
391                         if (*src == 0)
392                                 src = ".";
393                         host = strrchr(argv[i], '@');
394                         len = strlen(ssh_program) + strlen(argv[i]) +
395                             strlen(src) + (tuser ? strlen(tuser) : 0) +
396                             strlen(thost) + strlen(targ) +
397                             strlen(ssh_options) + CMDNEEDS + 20;
398                         bp = xmalloc(len);
399                         if (host) {
400                                 *host++ = 0;
401                                 host = cleanhostname(host);
402                                 suser = argv[i];
403                                 if (*suser == '\0')
404                                         suser = pwd->pw_name;
405                                 else if (!okname(suser)) {
406                                         xfree(bp);
407                                         continue;
408                                 }
409                                 if (tuser && !okname(tuser)) {
410                                         xfree(bp);
411                                         continue;
412                                 }
413                                 snprintf(bp, len,
414                                     "%s%s %s -n "
415                                     "-l %s %s %s %s '%s%s%s:%s'",
416                                     ssh_program, verbose_mode ? " -v" : "",
417                                     ssh_options, suser, host, cmd, src,
418                                     tuser ? tuser : "", tuser ? "@" : "",
419                                     thost, targ);
420                         } else {
421                                 host = cleanhostname(argv[i]);
422                                 snprintf(bp, len,
423                                     "exec %s%s %s -n %s "
424                                     "%s %s '%s%s%s:%s'",
425                                     ssh_program, verbose_mode ? " -v" : "",
426                                     ssh_options, host, cmd, src,
427                                     tuser ? tuser : "", tuser ? "@" : "",
428                                     thost, targ);
429                         }
430                         if (verbose_mode)
431                                 fprintf(stderr, "Executing: %s\n", bp);
432                         if (system(bp) != 0)
433                                 errs = 1;
434                         (void) xfree(bp);
435                 } else {        /* local to remote */
436                         if (remin == -1) {
437                                 len = strlen(targ) + CMDNEEDS + 20;
438                                 bp = xmalloc(len);
439                                 (void) snprintf(bp, len, "%s -t %s", cmd, targ);
440                                 host = cleanhostname(thost);
441                                 if (do_cmd(host, tuser, bp, &remin,
442                                     &remout, argc) < 0)
443                                         exit(1);
444                                 if (response() < 0)
445                                         exit(1);
446                                 (void) xfree(bp);
447                         }
448                         source(1, argv + i);
449                 }
450         }
451 }
452
453 void
454 tolocal(int argc, char **argv)
455 {
456         int i, len;
457         char *bp, *host, *src, *suser;
458
459         for (i = 0; i < argc - 1; i++) {
460                 if (!(src = colon(argv[i]))) {  /* Local to local. */
461                         len = strlen(_PATH_CP) + strlen(argv[i]) +
462                             strlen(argv[argc - 1]) + 20;
463                         bp = xmalloc(len);
464                         (void) snprintf(bp, len, "exec %s%s%s %s %s", _PATH_CP,
465                             iamrecursive ? " -r" : "", pflag ? " -p" : "",
466                             argv[i], argv[argc - 1]);
467                         if (verbose_mode)
468                                 fprintf(stderr, "Executing: %s\n", bp);
469                         if (system(bp))
470                                 ++errs;
471                         (void) xfree(bp);
472                         continue;
473                 }
474                 *src++ = 0;
475                 if (*src == 0)
476                         src = ".";
477                 if ((host = strrchr(argv[i], '@')) == NULL) {
478                         host = argv[i];
479                         suser = NULL;
480                 } else {
481                         *host++ = 0;
482                         suser = argv[i];
483                         if (*suser == '\0')
484                                 suser = pwd->pw_name;
485                 }
486                 host = cleanhostname(host);
487                 len = strlen(src) + CMDNEEDS + 20;
488                 bp = xmalloc(len);
489                 (void) snprintf(bp, len, "%s -f %s", cmd, src);
490                 if (do_cmd(host, suser, bp, &remin, &remout, argc) < 0) {
491                         (void) xfree(bp);
492                         ++errs;
493                         continue;
494                 }
495                 xfree(bp);
496                 sink(1, argv + argc - 1);
497                 (void) close(remin);
498                 remin = remout = -1;
499         }
500 }
501
502 void
503 source(int argc, char **argv)
504 {
505         struct stat stb;
506         static BUF buffer;
507         BUF *bp;
508         off_t i, amt, result, statbytes;
509         int fd, haderr, indx;
510         char *last, *name, buf[2048];
511         int len;
512
513         for (indx = 0; indx < argc; ++indx) {
514                 name = argv[indx];
515                 statbytes = 0;
516                 len = strlen(name);
517                 while (len > 1 && name[len-1] == '/')
518                         name[--len] = '\0';
519                 if (strchr(name, '\n') != NULL) {
520                         run_err("%s: skipping, filename contains a newline",
521                             name);
522                         goto next;
523                 }
524                 if ((fd = open(name, O_RDONLY, 0)) < 0)
525                         goto syserr;
526                 if (fstat(fd, &stb) < 0) {
527 syserr:                 run_err("%s: %s", name, strerror(errno));
528                         goto next;
529                 }
530                 switch (stb.st_mode & S_IFMT) {
531                 case S_IFREG:
532                         break;
533                 case S_IFDIR:
534                         if (iamrecursive) {
535                                 rsource(name, &stb);
536                                 goto next;
537                         }
538                         /* FALLTHROUGH */
539                 default:
540                         run_err("%s: not a regular file", name);
541                         goto next;
542                 }
543                 if ((last = strrchr(name, '/')) == NULL)
544                         last = name;
545                 else
546                         ++last;
547                 curfile = last;
548                 if (pflag) {
549                         /*
550                          * Make it compatible with possible future
551                          * versions expecting microseconds.
552                          */
553                         (void) snprintf(buf, sizeof buf, "T%lu 0 %lu 0\n",
554                             (u_long) stb.st_mtime,
555                             (u_long) stb.st_atime);
556                         (void) atomicio(vwrite, remout, buf, strlen(buf));
557                         if (response() < 0)
558                                 goto next;
559                 }
560 #define FILEMODEMASK    (S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO)
561                 snprintf(buf, sizeof buf, "C%04o %lld %s\n",
562                     (u_int) (stb.st_mode & FILEMODEMASK),
563                     (int64_t)stb.st_size, last);
564                 if (verbose_mode) {
565                         fprintf(stderr, "Sending file modes: %s", buf);
566                 }
567                 (void) atomicio(vwrite, remout, buf, strlen(buf));
568                 if (response() < 0)
569                         goto next;
570                 if ((bp = allocbuf(&buffer, fd, 2048)) == NULL) {
571 next:                   (void) close(fd);
572                         continue;
573                 }
574                 if (showprogress)
575                         start_progress_meter(curfile, stb.st_size, &statbytes);
576                 /* Keep writing after an error so that we stay sync'd up. */
577                 for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
578                         amt = bp->cnt;
579                         if (i + amt > stb.st_size)
580                                 amt = stb.st_size - i;
581                         if (!haderr) {
582                                 result = atomicio(read, fd, bp->buf, amt);
583                                 if (result != amt)
584                                         haderr = result >= 0 ? EIO : errno;
585                         }
586                         if (haderr)
587                                 (void) atomicio(vwrite, remout, bp->buf, amt);
588                         else {
589                                 result = atomicio(vwrite, remout, bp->buf, amt);
590                                 if (result != amt)
591                                         haderr = result >= 0 ? EIO : errno;
592                                 statbytes += result;
593                         }
594                         if (limit_rate)
595                                 bwlimit(amt);
596                 }
597                 if (showprogress)
598                         stop_progress_meter();
599
600                 if (close(fd) < 0 && !haderr)
601                         haderr = errno;
602                 if (!haderr)
603                         (void) atomicio(vwrite, remout, "", 1);
604                 else
605                         run_err("%s: %s", name, strerror(haderr));
606                 (void) response();
607         }
608 }
609
610 void
611 rsource(char *name, struct stat *statp)
612 {
613         DIR *dirp;
614         struct dirent *dp;
615         char *last, *vect[1], path[1100];
616
617         if (!(dirp = opendir(name))) {
618                 run_err("%s: %s", name, strerror(errno));
619                 return;
620         }
621         last = strrchr(name, '/');
622         if (last == 0)
623                 last = name;
624         else
625                 last++;
626         if (pflag) {
627                 (void) snprintf(path, sizeof(path), "T%lu 0 %lu 0\n",
628                     (u_long) statp->st_mtime,
629                     (u_long) statp->st_atime);
630                 (void) atomicio(vwrite, remout, path, strlen(path));
631                 if (response() < 0) {
632                         closedir(dirp);
633                         return;
634                 }
635         }
636         (void) snprintf(path, sizeof path, "D%04o %d %.1024s\n",
637             (u_int) (statp->st_mode & FILEMODEMASK), 0, last);
638         if (verbose_mode)
639                 fprintf(stderr, "Entering directory: %s", path);
640         (void) atomicio(vwrite, remout, path, strlen(path));
641         if (response() < 0) {
642                 closedir(dirp);
643                 return;
644         }
645         while ((dp = readdir(dirp)) != NULL) {
646                 if (dp->d_ino == 0)
647                         continue;
648                 if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
649                         continue;
650                 if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path) - 1) {
651                         run_err("%s/%s: name too long", name, dp->d_name);
652                         continue;
653                 }
654                 (void) snprintf(path, sizeof path, "%s/%s", name, dp->d_name);
655                 vect[0] = path;
656                 source(1, vect);
657         }
658         (void) closedir(dirp);
659         (void) atomicio(vwrite, remout, "E\n", 2);
660         (void) response();
661 }
662
663 void
664 bwlimit(int amount)
665 {
666         static struct timeval bwstart, bwend;
667         static int lamt, thresh = 16384;
668         u_int64_t wait;
669         struct timespec ts, rm;
670
671         if (!timerisset(&bwstart)) {
672                 gettimeofday(&bwstart, NULL);
673                 return;
674         }
675
676         lamt += amount;
677         if (lamt < thresh)
678                 return;
679
680         gettimeofday(&bwend, NULL);
681         timersub(&bwend, &bwstart, &bwend);
682         if (!timerisset(&bwend))
683                 return;
684
685         lamt *= 8;
686         wait = (double)1000000L * lamt / limit_rate;
687
688         bwstart.tv_sec = wait / 1000000L;
689         bwstart.tv_usec = wait % 1000000L;
690
691         if (timercmp(&bwstart, &bwend, >)) {
692                 timersub(&bwstart, &bwend, &bwend);
693
694                 /* Adjust the wait time */
695                 if (bwend.tv_sec) {
696                         thresh /= 2;
697                         if (thresh < 2048)
698                                 thresh = 2048;
699                 } else if (bwend.tv_usec < 100) {
700                         thresh *= 2;
701                         if (thresh > 32768)
702                                 thresh = 32768;
703                 }
704
705                 TIMEVAL_TO_TIMESPEC(&bwend, &ts);
706                 while (nanosleep(&ts, &rm) == -1) {
707                         if (errno != EINTR)
708                                 break;
709                         ts = rm;
710                 }
711         }
712
713         lamt = 0;
714         gettimeofday(&bwstart, NULL);
715 }
716
717 void
718 sink(int argc, char **argv)
719 {
720         static BUF buffer;
721         struct stat stb;
722         enum {
723                 YES, NO, DISPLAYED
724         } wrerr;
725         BUF *bp;
726         off_t i, j;
727         int amt, count, exists, first, mask, mode, ofd, omode;
728         off_t size, statbytes;
729         int setimes, targisdir, wrerrno = 0;
730         char ch, *cp, *np, *targ, *why, *vect[1], buf[2048];
731         struct timeval tv[2];
732
733 #define atime   tv[0]
734 #define mtime   tv[1]
735 #define SCREWUP(str)    do { why = str; goto screwup; } while (0)
736
737         setimes = targisdir = 0;
738         mask = umask(0);
739         if (!pflag)
740                 (void) umask(mask);
741         if (argc != 1) {
742                 run_err("ambiguous target");
743                 exit(1);
744         }
745         targ = *argv;
746         if (targetshouldbedirectory)
747                 verifydir(targ);
748
749         (void) atomicio(vwrite, remout, "", 1);
750         if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
751                 targisdir = 1;
752         for (first = 1;; first = 0) {
753                 cp = buf;
754                 if (atomicio(read, remin, cp, 1) <= 0)
755                         return;
756                 if (*cp++ == '\n')
757                         SCREWUP("unexpected <newline>");
758                 do {
759                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
760                                 SCREWUP("lost connection");
761                         *cp++ = ch;
762                 } while (cp < &buf[sizeof(buf) - 1] && ch != '\n');
763                 *cp = 0;
764
765                 if (buf[0] == '\01' || buf[0] == '\02') {
766                         if (iamremote == 0)
767                                 (void) atomicio(vwrite, STDERR_FILENO,
768                                     buf + 1, strlen(buf + 1));
769                         if (buf[0] == '\02')
770                                 exit(1);
771                         ++errs;
772                         continue;
773                 }
774                 if (buf[0] == 'E') {
775                         (void) atomicio(vwrite, remout, "", 1);
776                         return;
777                 }
778                 if (ch == '\n')
779                         *--cp = 0;
780
781                 cp = buf;
782                 if (*cp == 'T') {
783                         setimes++;
784                         cp++;
785                         mtime.tv_sec = strtol(cp, &cp, 10);
786                         if (!cp || *cp++ != ' ')
787                                 SCREWUP("mtime.sec not delimited");
788                         mtime.tv_usec = strtol(cp, &cp, 10);
789                         if (!cp || *cp++ != ' ')
790                                 SCREWUP("mtime.usec not delimited");
791                         atime.tv_sec = strtol(cp, &cp, 10);
792                         if (!cp || *cp++ != ' ')
793                                 SCREWUP("atime.sec not delimited");
794                         atime.tv_usec = strtol(cp, &cp, 10);
795                         if (!cp || *cp++ != '\0')
796                                 SCREWUP("atime.usec not delimited");
797                         (void) atomicio(vwrite, remout, "", 1);
798                         continue;
799                 }
800                 if (*cp != 'C' && *cp != 'D') {
801                         /*
802                          * Check for the case "rcp remote:foo\* local:bar".
803                          * In this case, the line "No match." can be returned
804                          * by the shell before the rcp command on the remote is
805                          * executed so the ^Aerror_message convention isn't
806                          * followed.
807                          */
808                         if (first) {
809                                 run_err("%s", cp);
810                                 exit(1);
811                         }
812                         SCREWUP("expected control record");
813                 }
814                 mode = 0;
815                 for (++cp; cp < buf + 5; cp++) {
816                         if (*cp < '0' || *cp > '7')
817                                 SCREWUP("bad mode");
818                         mode = (mode << 3) | (*cp - '0');
819                 }
820                 if (*cp++ != ' ')
821                         SCREWUP("mode not delimited");
822
823                 for (size = 0; isdigit(*cp);)
824                         size = size * 10 + (*cp++ - '0');
825                 if (*cp++ != ' ')
826                         SCREWUP("size not delimited");
827                 if (targisdir) {
828                         static char *namebuf;
829                         static int cursize;
830                         size_t need;
831
832                         need = strlen(targ) + strlen(cp) + 250;
833                         if (need > cursize) {
834                                 if (namebuf)
835                                         xfree(namebuf);
836                                 namebuf = xmalloc(need);
837                                 cursize = need;
838                         }
839                         (void) snprintf(namebuf, need, "%s%s%s", targ,
840                             strcmp(targ, "/") ? "/" : "", cp);
841                         np = namebuf;
842                 } else
843                         np = targ;
844                 curfile = cp;
845                 exists = stat(np, &stb) == 0;
846                 if (buf[0] == 'D') {
847                         int mod_flag = pflag;
848                         if (exists) {
849                                 if (!S_ISDIR(stb.st_mode)) {
850                                         errno = ENOTDIR;
851                                         goto bad;
852                                 }
853                                 if (pflag)
854                                         (void) chmod(np, mode);
855                         } else {
856                                 /* Handle copying from a read-only
857                                    directory */
858                                 mod_flag = 1;
859                                 if (mkdir(np, mode | S_IRWXU) < 0)
860                                         goto bad;
861                         }
862                         vect[0] = xstrdup(np);
863                         sink(1, vect);
864                         if (setimes) {
865                                 setimes = 0;
866                                 if (utimes(vect[0], tv) < 0)
867                                         run_err("%s: set times: %s",
868                                             vect[0], strerror(errno));
869                         }
870                         if (mod_flag)
871                                 (void) chmod(vect[0], mode);
872                         if (vect[0])
873                                 xfree(vect[0]);
874                         continue;
875                 }
876                 omode = mode;
877                 mode |= S_IWRITE;
878                 if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
879 bad:                    run_err("%s: %s", np, strerror(errno));
880                         continue;
881                 }
882                 (void) atomicio(vwrite, remout, "", 1);
883                 if ((bp = allocbuf(&buffer, ofd, 4096)) == NULL) {
884                         (void) close(ofd);
885                         continue;
886                 }
887                 cp = bp->buf;
888                 wrerr = NO;
889
890                 statbytes = 0;
891                 if (showprogress)
892                         start_progress_meter(curfile, size, &statbytes);
893                 for (count = i = 0; i < size; i += 4096) {
894                         amt = 4096;
895                         if (i + amt > size)
896                                 amt = size - i;
897                         count += amt;
898                         do {
899                                 j = read(remin, cp, amt);
900                                 if (j == -1 && (errno == EINTR ||
901                                     errno == EAGAIN)) {
902                                         continue;
903                                 } else if (j <= 0) {
904                                         run_err("%s", j ? strerror(errno) :
905                                             "dropped connection");
906                                         exit(1);
907                                 }
908                                 amt -= j;
909                                 cp += j;
910                                 statbytes += j;
911                         } while (amt > 0);
912
913                         if (limit_rate)
914                                 bwlimit(4096);
915
916                         if (count == bp->cnt) {
917                                 /* Keep reading so we stay sync'd up. */
918                                 if (wrerr == NO) {
919                                         j = atomicio(vwrite, ofd, bp->buf, count);
920                                         if (j != count) {
921                                                 wrerr = YES;
922                                                 wrerrno = j >= 0 ? EIO : errno;
923                                         }
924                                 }
925                                 count = 0;
926                                 cp = bp->buf;
927                         }
928                 }
929                 if (showprogress)
930                         stop_progress_meter();
931                 if (count != 0 && wrerr == NO &&
932                     (j = atomicio(vwrite, ofd, bp->buf, count)) != count) {
933                         wrerr = YES;
934                         wrerrno = j >= 0 ? EIO : errno;
935                 }
936                 if (wrerr == NO && ftruncate(ofd, size) != 0) {
937                         run_err("%s: truncate: %s", np, strerror(errno));
938                         wrerr = DISPLAYED;
939                 }
940                 if (pflag) {
941                         if (exists || omode != mode)
942 #ifdef HAVE_FCHMOD
943                                 if (fchmod(ofd, omode))
944 #else /* HAVE_FCHMOD */
945                                 if (chmod(np, omode))
946 #endif /* HAVE_FCHMOD */
947                                         run_err("%s: set mode: %s",
948                                             np, strerror(errno));
949                 } else {
950                         if (!exists && omode != mode)
951 #ifdef HAVE_FCHMOD
952                                 if (fchmod(ofd, omode & ~mask))
953 #else /* HAVE_FCHMOD */
954                                 if (chmod(np, omode & ~mask))
955 #endif /* HAVE_FCHMOD */
956                                         run_err("%s: set mode: %s",
957                                             np, strerror(errno));
958                 }
959                 if (close(ofd) == -1) {
960                         wrerr = YES;
961                         wrerrno = errno;
962                 }
963                 (void) response();
964                 if (setimes && wrerr == NO) {
965                         setimes = 0;
966                         if (utimes(np, tv) < 0) {
967                                 run_err("%s: set times: %s",
968                                     np, strerror(errno));
969                                 wrerr = DISPLAYED;
970                         }
971                 }
972                 switch (wrerr) {
973                 case YES:
974                         run_err("%s: %s", np, strerror(wrerrno));
975                         break;
976                 case NO:
977                         (void) atomicio(vwrite, remout, "", 1);
978                         break;
979                 case DISPLAYED:
980                         break;
981                 }
982         }
983 screwup:
984         run_err("protocol error: %s", why);
985         exit(1);
986 }
987
988 int
989 response(void)
990 {
991         char ch, *cp, resp, rbuf[2048];
992
993         if (atomicio(read, remin, &resp, sizeof(resp)) != sizeof(resp))
994                 lostconn(0);
995
996         cp = rbuf;
997         switch (resp) {
998         case 0:         /* ok */
999                 return (0);
1000         default:
1001                 *cp++ = resp;
1002                 /* FALLTHROUGH */
1003         case 1:         /* error, followed by error msg */
1004         case 2:         /* fatal error, "" */
1005                 do {
1006                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
1007                                 lostconn(0);
1008                         *cp++ = ch;
1009                 } while (cp < &rbuf[sizeof(rbuf) - 1] && ch != '\n');
1010
1011                 if (!iamremote)
1012                         (void) atomicio(vwrite, STDERR_FILENO, rbuf, cp - rbuf);
1013                 ++errs;
1014                 if (resp == 1)
1015                         return (-1);
1016                 exit(1);
1017         }
1018         /* NOTREACHED */
1019 }
1020
1021 void
1022 usage(void)
1023 {
1024         (void) fprintf(stderr,
1025             "usage: scp [-1246BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file]\n"
1026             "           [-l limit] [-o ssh_option] [-P port] [-S program]\n"
1027             "           [[user@]host1:]file1 [...] [[user@]host2:]file2\n");
1028         exit(1);
1029 }
1030
1031 void
1032 run_err(const char *fmt,...)
1033 {
1034         static FILE *fp;
1035         va_list ap;
1036
1037         ++errs;
1038         if (fp == NULL && !(fp = fdopen(remout, "w")))
1039                 return;
1040         (void) fprintf(fp, "%c", 0x01);
1041         (void) fprintf(fp, "scp: ");
1042         va_start(ap, fmt);
1043         (void) vfprintf(fp, fmt, ap);
1044         va_end(ap);
1045         (void) fprintf(fp, "\n");
1046         (void) fflush(fp);
1047
1048         if (!iamremote) {
1049                 va_start(ap, fmt);
1050                 vfprintf(stderr, fmt, ap);
1051                 va_end(ap);
1052                 fprintf(stderr, "\n");
1053         }
1054 }
1055
1056 void
1057 verifydir(char *cp)
1058 {
1059         struct stat stb;
1060
1061         if (!stat(cp, &stb)) {
1062                 if (S_ISDIR(stb.st_mode))
1063                         return;
1064                 errno = ENOTDIR;
1065         }
1066         run_err("%s: %s", cp, strerror(errno));
1067         exit(1);
1068 }
1069
1070 int
1071 okname(char *cp0)
1072 {
1073         int c;
1074         char *cp;
1075
1076         cp = cp0;
1077         do {
1078                 c = (int)*cp;
1079                 if (c & 0200)
1080                         goto bad;
1081                 if (!isalpha(c) && !isdigit(c)) {
1082                         switch (c) {
1083                         case '\'':
1084                         case '"':
1085                         case '`':
1086                         case ' ':
1087                         case '#':
1088                                 goto bad;
1089                         default:
1090                                 break;
1091                         }
1092                 }
1093         } while (*++cp);
1094         return (1);
1095
1096 bad:    fprintf(stderr, "%s: invalid user name\n", cp0);
1097         return (0);
1098 }
1099
1100 BUF *
1101 allocbuf(BUF *bp, int fd, int blksize)
1102 {
1103         size_t size;
1104 #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
1105         struct stat stb;
1106
1107         if (fstat(fd, &stb) < 0) {
1108                 run_err("fstat: %s", strerror(errno));
1109                 return (0);
1110         }
1111         size = roundup(stb.st_blksize, blksize);
1112         if (size == 0)
1113                 size = blksize;
1114 #else /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1115         size = blksize;
1116 #endif /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1117         if (bp->cnt >= size)
1118                 return (bp);
1119         if (bp->buf == NULL)
1120                 bp->buf = xmalloc(size);
1121         else
1122                 bp->buf = xrealloc(bp->buf, size);
1123         memset(bp->buf, 0, size);
1124         bp->cnt = size;
1125         return (bp);
1126 }
1127
1128 void
1129 lostconn(int signo)
1130 {
1131         if (!iamremote)
1132                 write(STDERR_FILENO, "lost connection\n", 16);
1133         if (signo)
1134                 _exit(1);
1135         else
1136                 exit(1);
1137 }
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