]> andersk Git - openssh.git/blob - scp.c
- dtucker@cvs.openbsd.org 2005/01/24 10:22:06
[openssh.git] / 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 1.119 2005/01/24 10:22:06 dtucker 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 extern char *__progname;
84
85 void bwlimit(int);
86
87 /* Struct for addargs */
88 arglist args;
89
90 /* Bandwidth limit */
91 off_t limit_rate = 0;
92
93 /* Name of current file being transferred. */
94 char *curfile;
95
96 /* This is set to non-zero to enable verbose mode. */
97 int verbose_mode = 0;
98
99 /* This is set to zero if the progressmeter is not desired. */
100 int showprogress = 1;
101
102 /* This is the program to execute for the secured connection. ("ssh" or -S) */
103 char *ssh_program = _PATH_SSH_PROGRAM;
104
105 /* This is used to store the pid of ssh_program */
106 pid_t do_cmd_pid = -1;
107
108 static void
109 killchild(int signo)
110 {
111         if (do_cmd_pid > 1) {
112                 kill(do_cmd_pid, signo);
113                 waitpid(do_cmd_pid, NULL, 0);
114         }
115
116         _exit(1);
117 }
118
119 /*
120  * This function executes the given command as the specified user on the
121  * given host.  This returns < 0 if execution fails, and >= 0 otherwise. This
122  * assigns the input and output file descriptors on success.
123  */
124
125 int
126 do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout, int argc)
127 {
128         int pin[2], pout[2], reserved[2];
129
130         if (verbose_mode)
131                 fprintf(stderr,
132                     "Executing: program %s host %s, user %s, command %s\n",
133                     ssh_program, host,
134                     remuser ? remuser : "(unspecified)", cmd);
135
136         /*
137          * Reserve two descriptors so that the real pipes won't get
138          * descriptors 0 and 1 because that will screw up dup2 below.
139          */
140         pipe(reserved);
141
142         /* Create a socket pair for communicating with ssh. */
143         if (pipe(pin) < 0)
144                 fatal("pipe: %s", strerror(errno));
145         if (pipe(pout) < 0)
146                 fatal("pipe: %s", strerror(errno));
147
148         /* Free the reserved descriptors. */
149         close(reserved[0]);
150         close(reserved[1]);
151
152         /* Fork a child to execute the command on the remote host using ssh. */
153         do_cmd_pid = fork();
154         if (do_cmd_pid == 0) {
155                 /* Child. */
156                 close(pin[1]);
157                 close(pout[0]);
158                 dup2(pin[0], 0);
159                 dup2(pout[1], 1);
160                 close(pin[0]);
161                 close(pout[1]);
162
163                 args.list[0] = ssh_program;
164                 if (remuser != NULL)
165                         addargs(&args, "-l%s", remuser);
166                 addargs(&args, "%s", host);
167                 addargs(&args, "%s", cmd);
168
169                 execvp(ssh_program, args.list);
170                 perror(ssh_program);
171                 exit(1);
172         } else if (do_cmd_pid == -1) {
173                 fatal("fork: %s", strerror(errno));
174         }
175         /* Parent.  Close the other side, and return the local side. */
176         close(pin[0]);
177         *fdout = pin[1];
178         close(pout[1]);
179         *fdin = pout[0];
180         signal(SIGTERM, killchild);
181         signal(SIGINT, killchild);
182         signal(SIGHUP, killchild);
183         return 0;
184 }
185
186 typedef struct {
187         int cnt;
188         char *buf;
189 } BUF;
190
191 BUF *allocbuf(BUF *, int, int);
192 void lostconn(int);
193 void nospace(void);
194 int okname(char *);
195 void run_err(const char *,...);
196 void verifydir(char *);
197
198 struct passwd *pwd;
199 uid_t userid;
200 int errs, remin, remout;
201 int pflag, iamremote, iamrecursive, targetshouldbedirectory;
202
203 #define CMDNEEDS        64
204 char cmd[CMDNEEDS];             /* must hold "rcp -r -p -d\0" */
205
206 int response(void);
207 void rsource(char *, struct stat *);
208 void sink(int, char *[]);
209 void source(int, char *[]);
210 void tolocal(int, char *[]);
211 void toremote(char *, int, char *[]);
212 void usage(void);
213
214 int
215 main(int argc, char **argv)
216 {
217         int ch, fflag, tflag, status;
218         double speed;
219         char *targ, *endp;
220         extern char *optarg;
221         extern int optind;
222
223         __progname = ssh_get_progname(argv[0]);
224
225         args.list = NULL;
226         addargs(&args, "ssh");          /* overwritten with ssh_program */
227         addargs(&args, "-x");
228         addargs(&args, "-oForwardAgent no");
229         addargs(&args, "-oClearAllForwardings yes");
230
231         fflag = tflag = 0;
232         while ((ch = getopt(argc, argv, "dfl:prtvBCc:i:P:q1246S:o:F:")) != -1)
233                 switch (ch) {
234                 /* User-visible flags. */
235                 case '1':
236                 case '2':
237                 case '4':
238                 case '6':
239                 case 'C':
240                         addargs(&args, "-%c", ch);
241                         break;
242                 case 'o':
243                 case 'c':
244                 case 'i':
245                 case 'F':
246                         addargs(&args, "-%c%s", ch, optarg);
247                         break;
248                 case 'P':
249                         addargs(&args, "-p%s", optarg);
250                         break;
251                 case 'B':
252                         addargs(&args, "-oBatchmode yes");
253                         break;
254                 case 'l':
255                         speed = strtod(optarg, &endp);
256                         if (speed <= 0 || *endp != '\0')
257                                 usage();
258                         limit_rate = speed * 1024;
259                         break;
260                 case 'p':
261                         pflag = 1;
262                         break;
263                 case 'r':
264                         iamrecursive = 1;
265                         break;
266                 case 'S':
267                         ssh_program = xstrdup(optarg);
268                         break;
269                 case 'v':
270                         addargs(&args, "-v");
271                         verbose_mode = 1;
272                         break;
273                 case 'q':
274                         addargs(&args, "-q");
275                         showprogress = 0;
276                         break;
277
278                 /* Server options. */
279                 case 'd':
280                         targetshouldbedirectory = 1;
281                         break;
282                 case 'f':       /* "from" */
283                         iamremote = 1;
284                         fflag = 1;
285                         break;
286                 case 't':       /* "to" */
287                         iamremote = 1;
288                         tflag = 1;
289 #ifdef HAVE_CYGWIN
290                         setmode(0, O_BINARY);
291 #endif
292                         break;
293                 default:
294                         usage();
295                 }
296         argc -= optind;
297         argv += optind;
298
299         if ((pwd = getpwuid(userid = getuid())) == NULL)
300                 fatal("unknown user %u", (u_int) userid);
301
302         if (!isatty(STDERR_FILENO))
303                 showprogress = 0;
304
305         remin = STDIN_FILENO;
306         remout = STDOUT_FILENO;
307
308         if (fflag) {
309                 /* Follow "protocol", send data. */
310                 (void) response();
311                 source(argc, argv);
312                 exit(errs != 0);
313         }
314         if (tflag) {
315                 /* Receive data. */
316                 sink(argc, argv);
317                 exit(errs != 0);
318         }
319         if (argc < 2)
320                 usage();
321         if (argc > 2)
322                 targetshouldbedirectory = 1;
323
324         remin = remout = -1;
325         do_cmd_pid = -1;
326         /* Command to be executed on remote system using "ssh". */
327         (void) snprintf(cmd, sizeof cmd, "scp%s%s%s%s",
328             verbose_mode ? " -v" : "",
329             iamrecursive ? " -r" : "", pflag ? " -p" : "",
330             targetshouldbedirectory ? " -d" : "");
331
332         (void) signal(SIGPIPE, lostconn);
333
334         if ((targ = colon(argv[argc - 1])))     /* Dest is remote host. */
335                 toremote(targ, argc, argv);
336         else {
337                 tolocal(argc, argv);    /* Dest is local host. */
338                 if (targetshouldbedirectory)
339                         verifydir(argv[argc - 1]);
340         }
341         /*
342          * Finally check the exit status of the ssh process, if one was forked
343          * and no error has occured yet
344          */
345         if (do_cmd_pid != -1 && errs == 0) {
346                 if (remin != -1)
347                     (void) close(remin);
348                 if (remout != -1)
349                     (void) close(remout);
350                 if (waitpid(do_cmd_pid, &status, 0) == -1)
351                         errs = 1;
352                 else {
353                         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
354                                 errs = 1;
355                 }
356         }
357         exit(errs != 0);
358 }
359
360 void
361 toremote(char *targ, int argc, char **argv)
362 {
363         int i, len;
364         char *bp, *host, *src, *suser, *thost, *tuser;
365
366         *targ++ = 0;
367         if (*targ == 0)
368                 targ = ".";
369
370         if ((thost = strrchr(argv[argc - 1], '@'))) {
371                 /* user@host */
372                 *thost++ = 0;
373                 tuser = argv[argc - 1];
374                 if (*tuser == '\0')
375                         tuser = NULL;
376         } else {
377                 thost = argv[argc - 1];
378                 tuser = NULL;
379         }
380
381         for (i = 0; i < argc - 1; i++) {
382                 src = colon(argv[i]);
383                 if (src) {      /* remote to remote */
384                         static char *ssh_options =
385                             "-x -o'ClearAllForwardings yes'";
386                         *src++ = 0;
387                         if (*src == 0)
388                                 src = ".";
389                         host = strrchr(argv[i], '@');
390                         len = strlen(ssh_program) + strlen(argv[i]) +
391                             strlen(src) + (tuser ? strlen(tuser) : 0) +
392                             strlen(thost) + strlen(targ) +
393                             strlen(ssh_options) + CMDNEEDS + 20;
394                         bp = xmalloc(len);
395                         if (host) {
396                                 *host++ = 0;
397                                 host = cleanhostname(host);
398                                 suser = argv[i];
399                                 if (*suser == '\0')
400                                         suser = pwd->pw_name;
401                                 else if (!okname(suser)) {
402                                         xfree(bp);
403                                         continue;
404                                 }
405                                 if (tuser && !okname(tuser)) {
406                                         xfree(bp);
407                                         continue;
408                                 }
409                                 snprintf(bp, len,
410                                     "%s%s %s -n "
411                                     "-l %s %s %s %s '%s%s%s:%s'",
412                                     ssh_program, verbose_mode ? " -v" : "",
413                                     ssh_options, suser, host, cmd, src,
414                                     tuser ? tuser : "", tuser ? "@" : "",
415                                     thost, targ);
416                         } else {
417                                 host = cleanhostname(argv[i]);
418                                 snprintf(bp, len,
419                                     "exec %s%s %s -n %s "
420                                     "%s %s '%s%s%s:%s'",
421                                     ssh_program, verbose_mode ? " -v" : "",
422                                     ssh_options, host, cmd, src,
423                                     tuser ? tuser : "", tuser ? "@" : "",
424                                     thost, targ);
425                         }
426                         if (verbose_mode)
427                                 fprintf(stderr, "Executing: %s\n", bp);
428                         if (system(bp) != 0)
429                                 errs = 1;
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
449 void
450 tolocal(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
498 void
499 source(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) {
523 syserr:                 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) {
567 next:                   (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 (limit_rate)
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
606 void
607 rsource(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
659 void
660 bwlimit(int amount)
661 {
662         static struct timeval bwstart, bwend;
663         static int lamt, thresh = 16384;
664         u_int64_t waitlen;
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         waitlen = (double)1000000L * lamt / limit_rate;
683
684         bwstart.tv_sec = waitlen / 1000000L;
685         bwstart.tv_usec = waitlen % 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
713 void
714 sink(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)    { why = str; goto screwup; }
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                 if (verbose_mode)
761                         fprintf(stderr, "Sink: %s", buf);
762
763                 if (buf[0] == '\01' || buf[0] == '\02') {
764                         if (iamremote == 0)
765                                 (void) atomicio(vwrite, STDERR_FILENO,
766                                     buf + 1, strlen(buf + 1));
767                         if (buf[0] == '\02')
768                                 exit(1);
769                         ++errs;
770                         continue;
771                 }
772                 if (buf[0] == 'E') {
773                         (void) atomicio(vwrite, remout, "", 1);
774                         return;
775                 }
776                 if (ch == '\n')
777                         *--cp = 0;
778
779                 cp = buf;
780                 if (*cp == 'T') {
781                         setimes++;
782                         cp++;
783                         mtime.tv_sec = strtol(cp, &cp, 10);
784                         if (!cp || *cp++ != ' ')
785                                 SCREWUP("mtime.sec not delimited");
786                         mtime.tv_usec = strtol(cp, &cp, 10);
787                         if (!cp || *cp++ != ' ')
788                                 SCREWUP("mtime.usec not delimited");
789                         atime.tv_sec = strtol(cp, &cp, 10);
790                         if (!cp || *cp++ != ' ')
791                                 SCREWUP("atime.sec not delimited");
792                         atime.tv_usec = strtol(cp, &cp, 10);
793                         if (!cp || *cp++ != '\0')
794                                 SCREWUP("atime.usec not delimited");
795                         (void) atomicio(vwrite, remout, "", 1);
796                         continue;
797                 }
798                 if (*cp != 'C' && *cp != 'D') {
799                         /*
800                          * Check for the case "rcp remote:foo\* local:bar".
801                          * In this case, the line "No match." can be returned
802                          * by the shell before the rcp command on the remote is
803                          * executed so the ^Aerror_message convention isn't
804                          * followed.
805                          */
806                         if (first) {
807                                 run_err("%s", cp);
808                                 exit(1);
809                         }
810                         SCREWUP("expected control record");
811                 }
812                 mode = 0;
813                 for (++cp; cp < buf + 5; cp++) {
814                         if (*cp < '0' || *cp > '7')
815                                 SCREWUP("bad mode");
816                         mode = (mode << 3) | (*cp - '0');
817                 }
818                 if (*cp++ != ' ')
819                         SCREWUP("mode not delimited");
820
821                 for (size = 0; isdigit(*cp);)
822                         size = size * 10 + (*cp++ - '0');
823                 if (*cp++ != ' ')
824                         SCREWUP("size not delimited");
825                 if ((strchr(cp, '/') != NULL) || (strcmp(cp, "..") == 0)) {
826                         run_err("error: unexpected filename: %s", cp);
827                         exit(1);
828                 }
829                 if (targisdir) {
830                         static char *namebuf;
831                         static int cursize;
832                         size_t need;
833
834                         need = strlen(targ) + strlen(cp) + 250;
835                         if (need > cursize) {
836                                 if (namebuf)
837                                         xfree(namebuf);
838                                 namebuf = xmalloc(need);
839                                 cursize = need;
840                         }
841                         (void) snprintf(namebuf, need, "%s%s%s", targ,
842                             strcmp(targ, "/") ? "/" : "", cp);
843                         np = namebuf;
844                 } else
845                         np = targ;
846                 curfile = cp;
847                 exists = stat(np, &stb) == 0;
848                 if (buf[0] == 'D') {
849                         int mod_flag = pflag;
850                         if (!iamrecursive)
851                                 SCREWUP("received directory without -r");
852                         if (exists) {
853                                 if (!S_ISDIR(stb.st_mode)) {
854                                         errno = ENOTDIR;
855                                         goto bad;
856                                 }
857                                 if (pflag)
858                                         (void) chmod(np, mode);
859                         } else {
860                                 /* Handle copying from a read-only
861                                    directory */
862                                 mod_flag = 1;
863                                 if (mkdir(np, mode | S_IRWXU) < 0)
864                                         goto bad;
865                         }
866                         vect[0] = xstrdup(np);
867                         sink(1, vect);
868                         if (setimes) {
869                                 setimes = 0;
870                                 if (utimes(vect[0], tv) < 0)
871                                         run_err("%s: set times: %s",
872                                             vect[0], strerror(errno));
873                         }
874                         if (mod_flag)
875                                 (void) chmod(vect[0], mode);
876                         if (vect[0])
877                                 xfree(vect[0]);
878                         continue;
879                 }
880                 omode = mode;
881                 mode |= S_IWRITE;
882                 if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
883 bad:                    run_err("%s: %s", np, strerror(errno));
884                         continue;
885                 }
886                 (void) atomicio(vwrite, remout, "", 1);
887                 if ((bp = allocbuf(&buffer, ofd, 4096)) == NULL) {
888                         (void) close(ofd);
889                         continue;
890                 }
891                 cp = bp->buf;
892                 wrerr = NO;
893
894                 statbytes = 0;
895                 if (showprogress)
896                         start_progress_meter(curfile, size, &statbytes);
897                 for (count = i = 0; i < size; i += 4096) {
898                         amt = 4096;
899                         if (i + amt > size)
900                                 amt = size - i;
901                         count += amt;
902                         do {
903                                 j = atomicio(read, remin, cp, amt);
904                                 if (j <= 0) {
905                                         run_err("%s", j ? strerror(errno) :
906                                             "dropped connection");
907                                         exit(1);
908                                 }
909                                 amt -= j;
910                                 cp += j;
911                                 statbytes += j;
912                         } while (amt > 0);
913
914                         if (limit_rate)
915                                 bwlimit(4096);
916
917                         if (count == bp->cnt) {
918                                 /* Keep reading so we stay sync'd up. */
919                                 if (wrerr == NO) {
920                                         j = atomicio(vwrite, ofd, bp->buf, count);
921                                         if (j != count) {
922                                                 wrerr = YES;
923                                                 wrerrno = j >= 0 ? EIO : errno;
924                                         }
925                                 }
926                                 count = 0;
927                                 cp = bp->buf;
928                         }
929                 }
930                 if (showprogress)
931                         stop_progress_meter();
932                 if (count != 0 && wrerr == NO &&
933                     (j = atomicio(vwrite, ofd, bp->buf, count)) != count) {
934                         wrerr = YES;
935                         wrerrno = j >= 0 ? EIO : errno;
936                 }
937                 if (wrerr == NO && ftruncate(ofd, size) != 0) {
938                         run_err("%s: truncate: %s", np, strerror(errno));
939                         wrerr = DISPLAYED;
940                 }
941                 if (pflag) {
942                         if (exists || omode != mode)
943 #ifdef HAVE_FCHMOD
944                                 if (fchmod(ofd, omode)) {
945 #else /* HAVE_FCHMOD */
946                                 if (chmod(np, omode)) {
947 #endif /* HAVE_FCHMOD */
948                                         run_err("%s: set mode: %s",
949                                             np, strerror(errno));
950                                         wrerr = DISPLAYED;
951                                 }
952                 } else {
953                         if (!exists && omode != mode)
954 #ifdef HAVE_FCHMOD
955                                 if (fchmod(ofd, omode & ~mask)) {
956 #else /* HAVE_FCHMOD */
957                                 if (chmod(np, omode & ~mask)) {
958 #endif /* HAVE_FCHMOD */
959                                         run_err("%s: set mode: %s",
960                                             np, strerror(errno));
961                                         wrerr = DISPLAYED;
962                                 }
963                 }
964                 if (close(ofd) == -1) {
965                         wrerr = YES;
966                         wrerrno = errno;
967                 }
968                 (void) response();
969                 if (setimes && wrerr == NO) {
970                         setimes = 0;
971                         if (utimes(np, tv) < 0) {
972                                 run_err("%s: set times: %s",
973                                     np, strerror(errno));
974                                 wrerr = DISPLAYED;
975                         }
976                 }
977                 switch (wrerr) {
978                 case YES:
979                         run_err("%s: %s", np, strerror(wrerrno));
980                         break;
981                 case NO:
982                         (void) atomicio(vwrite, remout, "", 1);
983                         break;
984                 case DISPLAYED:
985                         break;
986                 }
987         }
988 screwup:
989         run_err("protocol error: %s", why);
990         exit(1);
991 }
992
993 int
994 response(void)
995 {
996         char ch, *cp, resp, rbuf[2048];
997
998         if (atomicio(read, remin, &resp, sizeof(resp)) != sizeof(resp))
999                 lostconn(0);
1000
1001         cp = rbuf;
1002         switch (resp) {
1003         case 0:         /* ok */
1004                 return (0);
1005         default:
1006                 *cp++ = resp;
1007                 /* FALLTHROUGH */
1008         case 1:         /* error, followed by error msg */
1009         case 2:         /* fatal error, "" */
1010                 do {
1011                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
1012                                 lostconn(0);
1013                         *cp++ = ch;
1014                 } while (cp < &rbuf[sizeof(rbuf) - 1] && ch != '\n');
1015
1016                 if (!iamremote)
1017                         (void) atomicio(vwrite, STDERR_FILENO, rbuf, cp - rbuf);
1018                 ++errs;
1019                 if (resp == 1)
1020                         return (-1);
1021                 exit(1);
1022         }
1023         /* NOTREACHED */
1024 }
1025
1026 void
1027 usage(void)
1028 {
1029         (void) fprintf(stderr,
1030             "usage: scp [-1246BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file]\n"
1031             "           [-l limit] [-o ssh_option] [-P port] [-S program]\n"
1032             "           [[user@]host1:]file1 [...] [[user@]host2:]file2\n");
1033         exit(1);
1034 }
1035
1036 void
1037 run_err(const char *fmt,...)
1038 {
1039         static FILE *fp;
1040         va_list ap;
1041
1042         ++errs;
1043         if (fp == NULL && !(fp = fdopen(remout, "w")))
1044                 return;
1045         (void) fprintf(fp, "%c", 0x01);
1046         (void) fprintf(fp, "scp: ");
1047         va_start(ap, fmt);
1048         (void) vfprintf(fp, fmt, ap);
1049         va_end(ap);
1050         (void) fprintf(fp, "\n");
1051         (void) fflush(fp);
1052
1053         if (!iamremote) {
1054                 va_start(ap, fmt);
1055                 vfprintf(stderr, fmt, ap);
1056                 va_end(ap);
1057                 fprintf(stderr, "\n");
1058         }
1059 }
1060
1061 void
1062 verifydir(char *cp)
1063 {
1064         struct stat stb;
1065
1066         if (!stat(cp, &stb)) {
1067                 if (S_ISDIR(stb.st_mode))
1068                         return;
1069                 errno = ENOTDIR;
1070         }
1071         run_err("%s: %s", cp, strerror(errno));
1072         exit(1);
1073 }
1074
1075 int
1076 okname(char *cp0)
1077 {
1078         int c;
1079         char *cp;
1080
1081         cp = cp0;
1082         do {
1083                 c = (int)*cp;
1084                 if (c & 0200)
1085                         goto bad;
1086                 if (!isalpha(c) && !isdigit(c)) {
1087                         switch (c) {
1088                         case '\'':
1089                         case '"':
1090                         case '`':
1091                         case ' ':
1092                         case '#':
1093                                 goto bad;
1094                         default:
1095                                 break;
1096                         }
1097                 }
1098         } while (*++cp);
1099         return (1);
1100
1101 bad:    fprintf(stderr, "%s: invalid user name\n", cp0);
1102         return (0);
1103 }
1104
1105 BUF *
1106 allocbuf(BUF *bp, int fd, int blksize)
1107 {
1108         size_t size;
1109 #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
1110         struct stat stb;
1111
1112         if (fstat(fd, &stb) < 0) {
1113                 run_err("fstat: %s", strerror(errno));
1114                 return (0);
1115         }
1116         size = roundup(stb.st_blksize, blksize);
1117         if (size == 0)
1118                 size = blksize;
1119 #else /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1120         size = blksize;
1121 #endif /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1122         if (bp->cnt >= size)
1123                 return (bp);
1124         if (bp->buf == NULL)
1125                 bp->buf = xmalloc(size);
1126         else
1127                 bp->buf = xrealloc(bp->buf, size);
1128         memset(bp->buf, 0, size);
1129         bp->cnt = size;
1130         return (bp);
1131 }
1132
1133 void
1134 lostconn(int signo)
1135 {
1136         if (!iamremote)
1137                 write(STDERR_FILENO, "lost connection\n", 16);
1138         if (signo)
1139                 _exit(1);
1140         else
1141                 exit(1);
1142 }
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