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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. All advertising materials mentioning features or use of this software
56  *    must display the following acknowledgement:
57  *      This product includes software developed by the University of
58  *      California, Berkeley and its contributors.
59  * 4. Neither the name of the University nor the names of its contributors
60  *    may be used to endorse or promote products derived from this software
61  *    without specific prior written permission.
62  *
63  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
64  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
65  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
66  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
67  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
68  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
69  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
70  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
71  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
72  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
73  * SUCH DAMAGE.
74  *
75  */
76
77 #include "includes.h"
78 RCSID("$OpenBSD: scp.c,v 1.102 2003/03/05 22:33:43 markus Exp $");
79
80 #include "xmalloc.h"
81 #include "atomicio.h"
82 #include "pathnames.h"
83 #include "log.h"
84 #include "misc.h"
85 #include "progressmeter.h"
86
87 #ifdef HAVE___PROGNAME
88 extern char *__progname;
89 #else
90 char *__progname;
91 #endif
92
93 void bwlimit(int);
94
95 /* Struct for addargs */
96 arglist args;
97
98 /* Bandwidth limit */
99 off_t limitbw = 0;
100
101 /* Name of current file being transferred. */
102 char *curfile;
103
104 /* This is set to non-zero to enable verbose mode. */
105 int verbose_mode = 0;
106
107 /* This is set to zero if the progressmeter is not desired. */
108 int showprogress = 1;
109
110 /* This is the program to execute for the secured connection. ("ssh" or -S) */
111 char *ssh_program = _PATH_SSH_PROGRAM;
112
113 /* This is used to store the pid of ssh_program */
114 pid_t do_cmd_pid;
115
116 /*
117  * This function executes the given command as the specified user on the
118  * given host.  This returns < 0 if execution fails, and >= 0 otherwise. This
119  * assigns the input and output file descriptors on success.
120  */
121
122 int
123 do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout, int argc)
124 {
125         int pin[2], pout[2], reserved[2];
126
127         if (verbose_mode)
128                 fprintf(stderr,
129                     "Executing: program %s host %s, user %s, command %s\n",
130                     ssh_program, host,
131                     remuser ? remuser : "(unspecified)", cmd);
132
133         /*
134          * Reserve two descriptors so that the real pipes won't get
135          * descriptors 0 and 1 because that will screw up dup2 below.
136          */
137         pipe(reserved);
138
139         /* Create a socket pair for communicating with ssh. */
140         if (pipe(pin) < 0)
141                 fatal("pipe: %s", strerror(errno));
142         if (pipe(pout) < 0)
143                 fatal("pipe: %s", strerror(errno));
144
145         /* Free the reserved descriptors. */
146         close(reserved[0]);
147         close(reserved[1]);
148
149         /* For a child to execute the command on the remote host using ssh. */
150         do_cmd_pid = fork();
151         if (do_cmd_pid == 0) {
152                 /* Child. */
153                 close(pin[1]);
154                 close(pout[0]);
155                 dup2(pin[0], 0);
156                 dup2(pout[1], 1);
157                 close(pin[0]);
158                 close(pout[1]);
159
160                 args.list[0] = ssh_program;
161                 if (remuser != NULL)
162                         addargs(&args, "-l%s", remuser);
163                 addargs(&args, "%s", host);
164                 addargs(&args, "%s", cmd);
165
166                 execvp(ssh_program, args.list);
167                 perror(ssh_program);
168                 exit(1);
169         } else if (do_cmd_pid == -1) {
170                 fatal("fork: %s", strerror(errno));
171         }
172         /* Parent.  Close the other side, and return the local side. */
173         close(pin[0]);
174         *fdout = pin[1];
175         close(pout[1]);
176         *fdin = pout[0];
177         return 0;
178 }
179
180 typedef struct {
181         int cnt;
182         char *buf;
183 } BUF;
184
185 BUF *allocbuf(BUF *, int, int);
186 void lostconn(int);
187 void nospace(void);
188 int okname(char *);
189 void run_err(const char *,...);
190 void verifydir(char *);
191
192 struct passwd *pwd;
193 uid_t userid;
194 int errs, remin, remout;
195 int pflag, iamremote, iamrecursive, targetshouldbedirectory;
196
197 #define CMDNEEDS        64
198 char cmd[CMDNEEDS];             /* must hold "rcp -r -p -d\0" */
199
200 int response(void);
201 void rsource(char *, struct stat *);
202 void sink(int, char *[]);
203 void source(int, char *[]);
204 void tolocal(int, char *[]);
205 void toremote(char *, int, char *[]);
206 void usage(void);
207
208 int
209 main(argc, argv)
210         int argc;
211         char *argv[];
212 {
213         int ch, fflag, tflag, status;
214         double speed;
215         char *targ, *endp;
216         extern char *optarg;
217         extern int optind;
218
219         __progname = get_progname(argv[0]);
220
221         args.list = NULL;
222         addargs(&args, "ssh");          /* overwritten with ssh_program */
223         addargs(&args, "-x");
224         addargs(&args, "-oForwardAgent no");
225         addargs(&args, "-oClearAllForwardings yes");
226
227         fflag = tflag = 0;
228         while ((ch = getopt(argc, argv, "dfl:prtvBCc:i:P:q1246S:o:F:")) != -1)
229                 switch (ch) {
230                 /* User-visible flags. */
231                 case '1':
232                 case '2':
233                 case '4':
234                 case '6':
235                 case 'C':
236                         addargs(&args, "-%c", ch);
237                         break;
238                 case 'o':
239                 case 'c':
240                 case 'i':
241                 case 'F':
242                         addargs(&args, "-%c%s", ch, optarg);
243                         break;
244                 case 'P':
245                         addargs(&args, "-p%s", optarg);
246                         break;
247                 case 'B':
248                         addargs(&args, "-oBatchmode yes");
249                         break;
250                 case 'l':
251                         speed = strtod(optarg, &endp);
252                         if (speed <= 0 || *endp != '\0')
253                                 usage();
254                         limitbw = speed * 1024;
255                         break;
256                 case 'p':
257                         pflag = 1;
258                         break;
259                 case 'r':
260                         iamrecursive = 1;
261                         break;
262                 case 'S':
263                         ssh_program = xstrdup(optarg);
264                         break;
265                 case 'v':
266                         addargs(&args, "-v");
267                         verbose_mode = 1;
268                         break;
269                 case 'q':
270                         showprogress = 0;
271                         break;
272
273                 /* Server options. */
274                 case 'd':
275                         targetshouldbedirectory = 1;
276                         break;
277                 case 'f':       /* "from" */
278                         iamremote = 1;
279                         fflag = 1;
280                         break;
281                 case 't':       /* "to" */
282                         iamremote = 1;
283                         tflag = 1;
284 #ifdef HAVE_CYGWIN
285                         setmode(0, O_BINARY);
286 #endif
287                         break;
288                 default:
289                         usage();
290                 }
291         argc -= optind;
292         argv += optind;
293
294         if ((pwd = getpwuid(userid = getuid())) == NULL)
295                 fatal("unknown user %d", (int) userid);
296
297         if (!isatty(STDERR_FILENO))
298                 showprogress = 0;
299
300         remin = STDIN_FILENO;
301         remout = STDOUT_FILENO;
302
303         if (fflag) {
304                 /* Follow "protocol", send data. */
305                 (void) response();
306                 source(argc, argv);
307                 exit(errs != 0);
308         }
309         if (tflag) {
310                 /* Receive data. */
311                 sink(argc, argv);
312                 exit(errs != 0);
313         }
314         if (argc < 2)
315                 usage();
316         if (argc > 2)
317                 targetshouldbedirectory = 1;
318
319         remin = remout = -1;
320         do_cmd_pid = -1;
321         /* Command to be executed on remote system using "ssh". */
322         (void) snprintf(cmd, sizeof cmd, "scp%s%s%s%s",
323             verbose_mode ? " -v" : "",
324             iamrecursive ? " -r" : "", pflag ? " -p" : "",
325             targetshouldbedirectory ? " -d" : "");
326
327         (void) signal(SIGPIPE, lostconn);
328
329         if ((targ = colon(argv[argc - 1])))     /* Dest is remote host. */
330                 toremote(targ, argc, argv);
331         else {
332                 tolocal(argc, argv);    /* Dest is local host. */
333                 if (targetshouldbedirectory)
334                         verifydir(argv[argc - 1]);
335         }
336         /*
337          * Finally check the exit status of the ssh process, if one was forked
338          * and no error has occured yet
339          */
340         if (do_cmd_pid != -1 && errs == 0) {
341                 if (remin != -1)
342                     (void) close(remin);
343                 if (remout != -1)
344                     (void) close(remout);
345                 if (waitpid(do_cmd_pid, &status, 0) == -1)
346                         errs = 1;
347                 else {
348                         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
349                                 errs = 1;
350                 }
351         }
352         exit(errs != 0);
353 }
354
355 void
356 toremote(targ, argc, argv)
357         char *targ, *argv[];
358         int argc;
359 {
360         int i, len;
361         char *bp, *host, *src, *suser, *thost, *tuser;
362
363         *targ++ = 0;
364         if (*targ == 0)
365                 targ = ".";
366
367         if ((thost = strrchr(argv[argc - 1], '@'))) {
368                 /* user@host */
369                 *thost++ = 0;
370                 tuser = argv[argc - 1];
371                 if (*tuser == '\0')
372                         tuser = NULL;
373         } else {
374                 thost = argv[argc - 1];
375                 tuser = NULL;
376         }
377
378         for (i = 0; i < argc - 1; i++) {
379                 src = colon(argv[i]);
380                 if (src) {      /* remote to remote */
381                         static char *ssh_options =
382                             "-x -o'ClearAllForwardings yes'";
383                         *src++ = 0;
384                         if (*src == 0)
385                                 src = ".";
386                         host = strrchr(argv[i], '@');
387                         len = strlen(ssh_program) + strlen(argv[i]) +
388                             strlen(src) + (tuser ? strlen(tuser) : 0) +
389                             strlen(thost) + strlen(targ) +
390                             strlen(ssh_options) + CMDNEEDS + 20;
391                         bp = xmalloc(len);
392                         if (host) {
393                                 *host++ = 0;
394                                 host = cleanhostname(host);
395                                 suser = argv[i];
396                                 if (*suser == '\0')
397                                         suser = pwd->pw_name;
398                                 else if (!okname(suser)) {
399                                         xfree(bp);
400                                         continue;
401                                 }
402                                 if (tuser && !okname(tuser)) {
403                                         xfree(bp);
404                                         continue;
405                                 }
406                                 snprintf(bp, len,
407                                     "%s%s %s -n "
408                                     "-l %s %s %s %s '%s%s%s:%s'",
409                                     ssh_program, verbose_mode ? " -v" : "",
410                                     ssh_options, suser, host, cmd, src,
411                                     tuser ? tuser : "", tuser ? "@" : "",
412                                     thost, targ);
413                         } else {
414                                 host = cleanhostname(argv[i]);
415                                 snprintf(bp, len,
416                                     "exec %s%s %s -n %s "
417                                     "%s %s '%s%s%s:%s'",
418                                     ssh_program, verbose_mode ? " -v" : "",
419                                     ssh_options, host, cmd, src,
420                                     tuser ? tuser : "", tuser ? "@" : "",
421                                     thost, targ);
422                         }
423                         if (verbose_mode)
424                                 fprintf(stderr, "Executing: %s\n", bp);
425                         (void) system(bp);
426                         (void) xfree(bp);
427                 } else {        /* local to remote */
428                         if (remin == -1) {
429                                 len = strlen(targ) + CMDNEEDS + 20;
430                                 bp = xmalloc(len);
431                                 (void) snprintf(bp, len, "%s -t %s", cmd, targ);
432                                 host = cleanhostname(thost);
433                                 if (do_cmd(host, tuser, bp, &remin,
434                                     &remout, argc) < 0)
435                                         exit(1);
436                                 if (response() < 0)
437                                         exit(1);
438                                 (void) xfree(bp);
439                         }
440                         source(1, argv + i);
441                 }
442         }
443 }
444
445 void
446 tolocal(argc, argv)
447         int argc;
448         char *argv[];
449 {
450         int i, len;
451         char *bp, *host, *src, *suser;
452
453         for (i = 0; i < argc - 1; i++) {
454                 if (!(src = colon(argv[i]))) {  /* Local to local. */
455                         len = strlen(_PATH_CP) + strlen(argv[i]) +
456                             strlen(argv[argc - 1]) + 20;
457                         bp = xmalloc(len);
458                         (void) snprintf(bp, len, "exec %s%s%s %s %s", _PATH_CP,
459                             iamrecursive ? " -r" : "", pflag ? " -p" : "",
460                             argv[i], argv[argc - 1]);
461                         if (verbose_mode)
462                                 fprintf(stderr, "Executing: %s\n", bp);
463                         if (system(bp))
464                                 ++errs;
465                         (void) xfree(bp);
466                         continue;
467                 }
468                 *src++ = 0;
469                 if (*src == 0)
470                         src = ".";
471                 if ((host = strrchr(argv[i], '@')) == NULL) {
472                         host = argv[i];
473                         suser = NULL;
474                 } else {
475                         *host++ = 0;
476                         suser = argv[i];
477                         if (*suser == '\0')
478                                 suser = pwd->pw_name;
479                 }
480                 host = cleanhostname(host);
481                 len = strlen(src) + CMDNEEDS + 20;
482                 bp = xmalloc(len);
483                 (void) snprintf(bp, len, "%s -f %s", cmd, src);
484                 if (do_cmd(host, suser, bp, &remin, &remout, argc) < 0) {
485                         (void) xfree(bp);
486                         ++errs;
487                         continue;
488                 }
489                 xfree(bp);
490                 sink(1, argv + argc - 1);
491                 (void) close(remin);
492                 remin = remout = -1;
493         }
494 }
495
496 void
497 source(argc, argv)
498         int argc;
499         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(write, 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 #ifdef HAVE_LONG_LONG_INT
558                 snprintf(buf, sizeof buf, "C%04o %lld %s\n",
559                     (u_int) (stb.st_mode & FILEMODEMASK),
560                     (long long)stb.st_size, last);
561 #else
562                 /* XXX: Handle integer overflow? */
563                 snprintf(buf, sizeof buf, "C%04o %lu %s\n",
564                     (u_int) (stb.st_mode & FILEMODEMASK),
565                     (u_long) stb.st_size, last);
566 #endif
567                 if (verbose_mode) {
568                         fprintf(stderr, "Sending file modes: %s", buf);
569                 }
570                 (void) atomicio(write, remout, buf, strlen(buf));
571                 if (response() < 0)
572                         goto next;
573                 if ((bp = allocbuf(&buffer, fd, 2048)) == NULL) {
574 next:                   (void) close(fd);
575                         continue;
576                 }
577                 if (showprogress)
578                         start_progress_meter(curfile, stb.st_size, &statbytes);
579                 /* Keep writing after an error so that we stay sync'd up. */
580                 for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
581                         amt = bp->cnt;
582                         if (i + amt > stb.st_size)
583                                 amt = stb.st_size - i;
584                         if (!haderr) {
585                                 result = atomicio(read, fd, bp->buf, amt);
586                                 if (result != amt)
587                                         haderr = result >= 0 ? EIO : errno;
588                         }
589                         if (haderr)
590                                 (void) atomicio(write, remout, bp->buf, amt);
591                         else {
592                                 result = atomicio(write, remout, bp->buf, amt);
593                                 if (result != amt)
594                                         haderr = result >= 0 ? EIO : errno;
595                                 statbytes += result;
596                         }
597                         if (limitbw)
598                                 bwlimit(amt);
599                 }
600                 if (showprogress)
601                         stop_progress_meter();
602
603                 if (close(fd) < 0 && !haderr)
604                         haderr = errno;
605                 if (!haderr)
606                         (void) atomicio(write, remout, "", 1);
607                 else
608                         run_err("%s: %s", name, strerror(haderr));
609                 (void) response();
610         }
611 }
612
613 void
614 rsource(name, statp)
615         char *name;
616         struct stat *statp;
617 {
618         DIR *dirp;
619         struct dirent *dp;
620         char *last, *vect[1], path[1100];
621
622         if (!(dirp = opendir(name))) {
623                 run_err("%s: %s", name, strerror(errno));
624                 return;
625         }
626         last = strrchr(name, '/');
627         if (last == 0)
628                 last = name;
629         else
630                 last++;
631         if (pflag) {
632                 (void) snprintf(path, sizeof(path), "T%lu 0 %lu 0\n",
633                     (u_long) statp->st_mtime,
634                     (u_long) statp->st_atime);
635                 (void) atomicio(write, remout, path, strlen(path));
636                 if (response() < 0) {
637                         closedir(dirp);
638                         return;
639                 }
640         }
641         (void) snprintf(path, sizeof path, "D%04o %d %.1024s\n",
642             (u_int) (statp->st_mode & FILEMODEMASK), 0, last);
643         if (verbose_mode)
644                 fprintf(stderr, "Entering directory: %s", path);
645         (void) atomicio(write, remout, path, strlen(path));
646         if (response() < 0) {
647                 closedir(dirp);
648                 return;
649         }
650         while ((dp = readdir(dirp)) != NULL) {
651                 if (dp->d_ino == 0)
652                         continue;
653                 if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
654                         continue;
655                 if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path) - 1) {
656                         run_err("%s/%s: name too long", name, dp->d_name);
657                         continue;
658                 }
659                 (void) snprintf(path, sizeof path, "%s/%s", name, dp->d_name);
660                 vect[0] = path;
661                 source(1, vect);
662         }
663         (void) closedir(dirp);
664         (void) atomicio(write, remout, "E\n", 2);
665         (void) response();
666 }
667
668 void
669 bwlimit(int amount)
670 {
671         static struct timeval bwstart, bwend;
672         static int lamt, thresh = 16384;
673         u_int64_t wait;
674         struct timespec ts, rm;
675
676         if (!timerisset(&bwstart)) {
677                 gettimeofday(&bwstart, NULL);
678                 return;
679         }
680
681         lamt += amount;
682         if (lamt < thresh)
683                 return;
684
685         gettimeofday(&bwend, NULL);
686         timersub(&bwend, &bwstart, &bwend);
687         if (!timerisset(&bwend))
688                 return;
689
690         lamt *= 8;
691         wait = (double)1000000L * lamt / limitbw;
692
693         bwstart.tv_sec = wait / 1000000L;
694         bwstart.tv_usec = wait % 1000000L;
695
696         if (timercmp(&bwstart, &bwend, >)) {
697                 timersub(&bwstart, &bwend, &bwend);
698
699                 /* Adjust the wait time */
700                 if (bwend.tv_sec) {
701                         thresh /= 2;
702                         if (thresh < 2048)
703                                 thresh = 2048;
704                 } else if (bwend.tv_usec < 100) {
705                         thresh *= 2;
706                         if (thresh > 32768)
707                                 thresh = 32768;
708                 }
709
710                 TIMEVAL_TO_TIMESPEC(&bwend, &ts);
711                 while (nanosleep(&ts, &rm) == -1) {
712                         if (errno != EINTR)
713                                 break;
714                         ts = rm;
715                 }
716         }
717
718         lamt = 0;
719         gettimeofday(&bwstart, NULL);
720 }
721
722 void
723 sink(argc, argv)
724         int argc;
725         char *argv[];
726 {
727         static BUF buffer;
728         struct stat stb;
729         enum {
730                 YES, NO, DISPLAYED
731         } wrerr;
732         BUF *bp;
733         off_t i, j;
734         int amt, count, exists, first, mask, mode, ofd, omode;
735         off_t size, statbytes;
736         int setimes, targisdir, wrerrno = 0;
737         char ch, *cp, *np, *targ, *why, *vect[1], buf[2048];
738         struct timeval tv[2];
739
740 #define atime   tv[0]
741 #define mtime   tv[1]
742 #define SCREWUP(str)    do { why = str; goto screwup; } while (0)
743
744         setimes = targisdir = 0;
745         mask = umask(0);
746         if (!pflag)
747                 (void) umask(mask);
748         if (argc != 1) {
749                 run_err("ambiguous target");
750                 exit(1);
751         }
752         targ = *argv;
753         if (targetshouldbedirectory)
754                 verifydir(targ);
755
756         (void) atomicio(write, remout, "", 1);
757         if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
758                 targisdir = 1;
759         for (first = 1;; first = 0) {
760                 cp = buf;
761                 if (atomicio(read, remin, cp, 1) <= 0)
762                         return;
763                 if (*cp++ == '\n')
764                         SCREWUP("unexpected <newline>");
765                 do {
766                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
767                                 SCREWUP("lost connection");
768                         *cp++ = ch;
769                 } while (cp < &buf[sizeof(buf) - 1] && ch != '\n');
770                 *cp = 0;
771
772                 if (buf[0] == '\01' || buf[0] == '\02') {
773                         if (iamremote == 0)
774                                 (void) atomicio(write, STDERR_FILENO,
775                                     buf + 1, strlen(buf + 1));
776                         if (buf[0] == '\02')
777                                 exit(1);
778                         ++errs;
779                         continue;
780                 }
781                 if (buf[0] == 'E') {
782                         (void) atomicio(write, remout, "", 1);
783                         return;
784                 }
785                 if (ch == '\n')
786                         *--cp = 0;
787
788                 cp = buf;
789                 if (*cp == 'T') {
790                         setimes++;
791                         cp++;
792                         mtime.tv_sec = strtol(cp, &cp, 10);
793                         if (!cp || *cp++ != ' ')
794                                 SCREWUP("mtime.sec not delimited");
795                         mtime.tv_usec = strtol(cp, &cp, 10);
796                         if (!cp || *cp++ != ' ')
797                                 SCREWUP("mtime.usec not delimited");
798                         atime.tv_sec = strtol(cp, &cp, 10);
799                         if (!cp || *cp++ != ' ')
800                                 SCREWUP("atime.sec not delimited");
801                         atime.tv_usec = strtol(cp, &cp, 10);
802                         if (!cp || *cp++ != '\0')
803                                 SCREWUP("atime.usec not delimited");
804                         (void) atomicio(write, remout, "", 1);
805                         continue;
806                 }
807                 if (*cp != 'C' && *cp != 'D') {
808                         /*
809                          * Check for the case "rcp remote:foo\* local:bar".
810                          * In this case, the line "No match." can be returned
811                          * by the shell before the rcp command on the remote is
812                          * executed so the ^Aerror_message convention isn't
813                          * followed.
814                          */
815                         if (first) {
816                                 run_err("%s", cp);
817                                 exit(1);
818                         }
819                         SCREWUP("expected control record");
820                 }
821                 mode = 0;
822                 for (++cp; cp < buf + 5; cp++) {
823                         if (*cp < '0' || *cp > '7')
824                                 SCREWUP("bad mode");
825                         mode = (mode << 3) | (*cp - '0');
826                 }
827                 if (*cp++ != ' ')
828                         SCREWUP("mode not delimited");
829
830                 for (size = 0; isdigit(*cp);)
831                         size = size * 10 + (*cp++ - '0');
832                 if (*cp++ != ' ')
833                         SCREWUP("size not delimited");
834                 if (targisdir) {
835                         static char *namebuf;
836                         static int cursize;
837                         size_t need;
838
839                         need = strlen(targ) + strlen(cp) + 250;
840                         if (need > cursize) {
841                                 if (namebuf)
842                                         xfree(namebuf);
843                                 namebuf = xmalloc(need);
844                                 cursize = need;
845                         }
846                         (void) snprintf(namebuf, need, "%s%s%s", targ,
847                             strcmp(targ, "/") ? "/" : "", cp);
848                         np = namebuf;
849                 } else
850                         np = targ;
851                 curfile = cp;
852                 exists = stat(np, &stb) == 0;
853                 if (buf[0] == 'D') {
854                         int mod_flag = pflag;
855                         if (exists) {
856                                 if (!S_ISDIR(stb.st_mode)) {
857                                         errno = ENOTDIR;
858                                         goto bad;
859                                 }
860                                 if (pflag)
861                                         (void) chmod(np, mode);
862                         } else {
863                                 /* Handle copying from a read-only
864                                    directory */
865                                 mod_flag = 1;
866                                 if (mkdir(np, mode | S_IRWXU) < 0)
867                                         goto bad;
868                         }
869                         vect[0] = xstrdup(np);
870                         sink(1, vect);
871                         if (setimes) {
872                                 setimes = 0;
873                                 if (utimes(vect[0], tv) < 0)
874                                         run_err("%s: set times: %s",
875                                             vect[0], strerror(errno));
876                         }
877                         if (mod_flag)
878                                 (void) chmod(vect[0], mode);
879                         if (vect[0])
880                                 xfree(vect[0]);
881                         continue;
882                 }
883                 omode = mode;
884                 mode |= S_IWRITE;
885                 if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
886 bad:                    run_err("%s: %s", np, strerror(errno));
887                         continue;
888                 }
889                 (void) atomicio(write, remout, "", 1);
890                 if ((bp = allocbuf(&buffer, ofd, 4096)) == NULL) {
891                         (void) close(ofd);
892                         continue;
893                 }
894                 cp = bp->buf;
895                 wrerr = NO;
896
897                 statbytes = 0;
898                 if (showprogress)
899                         start_progress_meter(curfile, size, &statbytes);
900                 for (count = i = 0; i < size; i += 4096) {
901                         amt = 4096;
902                         if (i + amt > size)
903                                 amt = size - i;
904                         count += amt;
905                         do {
906                                 j = read(remin, cp, amt);
907                                 if (j == -1 && (errno == EINTR ||
908                                     errno == EAGAIN)) {
909                                         continue;
910                                 } else if (j <= 0) {
911                                         run_err("%s", j ? strerror(errno) :
912                                             "dropped connection");
913                                         exit(1);
914                                 }
915                                 amt -= j;
916                                 cp += j;
917                                 statbytes += j;
918                         } while (amt > 0);
919                 
920                         if (limitbw)
921                                 bwlimit(4096);
922
923                         if (count == bp->cnt) {
924                                 /* Keep reading so we stay sync'd up. */
925                                 if (wrerr == NO) {
926                                         j = atomicio(write, ofd, bp->buf, count);
927                                         if (j != count) {
928                                                 wrerr = YES;
929                                                 wrerrno = j >= 0 ? EIO : errno;
930                                         }
931                                 }
932                                 count = 0;
933                                 cp = bp->buf;
934                         }
935                 }
936                 if (showprogress)
937                         stop_progress_meter();
938                 if (count != 0 && wrerr == NO &&
939                     (j = atomicio(write, ofd, bp->buf, count)) != count) {
940                         wrerr = YES;
941                         wrerrno = j >= 0 ? EIO : errno;
942                 }
943                 if (wrerr == NO && ftruncate(ofd, size) != 0) {
944                         run_err("%s: truncate: %s", np, strerror(errno));
945                         wrerr = DISPLAYED;
946                 }
947                 if (pflag) {
948                         if (exists || omode != mode)
949 #ifdef HAVE_FCHMOD
950                                 if (fchmod(ofd, omode))
951 #else /* HAVE_FCHMOD */
952                                 if (chmod(np, omode))
953 #endif /* HAVE_FCHMOD */
954                                         run_err("%s: set mode: %s",
955                                             np, strerror(errno));
956                 } else {
957                         if (!exists && omode != mode)
958 #ifdef HAVE_FCHMOD
959                                 if (fchmod(ofd, omode & ~mask))
960 #else /* HAVE_FCHMOD */
961                                 if (chmod(np, omode & ~mask))
962 #endif /* HAVE_FCHMOD */
963                                         run_err("%s: set mode: %s",
964                                             np, strerror(errno));
965                 }
966                 if (close(ofd) == -1) {
967                         wrerr = YES;
968                         wrerrno = errno;
969                 }
970                 (void) response();
971                 if (setimes && wrerr == NO) {
972                         setimes = 0;
973                         if (utimes(np, tv) < 0) {
974                                 run_err("%s: set times: %s",
975                                     np, strerror(errno));
976                                 wrerr = DISPLAYED;
977                         }
978                 }
979                 switch (wrerr) {
980                 case YES:
981                         run_err("%s: %s", np, strerror(wrerrno));
982                         break;
983                 case NO:
984                         (void) atomicio(write, remout, "", 1);
985                         break;
986                 case DISPLAYED:
987                         break;
988                 }
989         }
990 screwup:
991         run_err("protocol error: %s", why);
992         exit(1);
993 }
994
995 int
996 response(void)
997 {
998         char ch, *cp, resp, rbuf[2048];
999
1000         if (atomicio(read, remin, &resp, sizeof(resp)) != sizeof(resp))
1001                 lostconn(0);
1002
1003         cp = rbuf;
1004         switch (resp) {
1005         case 0:         /* ok */
1006                 return (0);
1007         default:
1008                 *cp++ = resp;
1009                 /* FALLTHROUGH */
1010         case 1:         /* error, followed by error msg */
1011         case 2:         /* fatal error, "" */
1012                 do {
1013                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
1014                                 lostconn(0);
1015                         *cp++ = ch;
1016                 } while (cp < &rbuf[sizeof(rbuf) - 1] && ch != '\n');
1017
1018                 if (!iamremote)
1019                         (void) atomicio(write, STDERR_FILENO, rbuf, cp - rbuf);
1020                 ++errs;
1021                 if (resp == 1)
1022                         return (-1);
1023                 exit(1);
1024         }
1025         /* NOTREACHED */
1026 }
1027
1028 void
1029 usage(void)
1030 {
1031         (void) fprintf(stderr,
1032             "usage: scp [-pqrvBC1246] [-F config] [-S program] [-P port]\n"
1033             "           [-c cipher] [-i identity] [-l limit] [-o option]\n"
1034             "           [[user@]host1:]file1 [...] [[user@]host2:]file2\n");
1035         exit(1);
1036 }
1037
1038 void
1039 run_err(const char *fmt,...)
1040 {
1041         static FILE *fp;
1042         va_list ap;
1043
1044         ++errs;
1045         if (fp == NULL && !(fp = fdopen(remout, "w")))
1046                 return;
1047         (void) fprintf(fp, "%c", 0x01);
1048         (void) fprintf(fp, "scp: ");
1049         va_start(ap, fmt);
1050         (void) vfprintf(fp, fmt, ap);
1051         va_end(ap);
1052         (void) fprintf(fp, "\n");
1053         (void) fflush(fp);
1054
1055         if (!iamremote) {
1056                 va_start(ap, fmt);
1057                 vfprintf(stderr, fmt, ap);
1058                 va_end(ap);
1059                 fprintf(stderr, "\n");
1060         }
1061 }
1062
1063 void
1064 verifydir(cp)
1065         char *cp;
1066 {
1067         struct stat stb;
1068
1069         if (!stat(cp, &stb)) {
1070                 if (S_ISDIR(stb.st_mode))
1071                         return;
1072                 errno = ENOTDIR;
1073         }
1074         run_err("%s: %s", cp, strerror(errno));
1075         exit(1);
1076 }
1077
1078 int
1079 okname(cp0)
1080         char *cp0;
1081 {
1082         int c;
1083         char *cp;
1084
1085         cp = cp0;
1086         do {
1087                 c = (int)*cp;
1088                 if (c & 0200)
1089                         goto bad;
1090                 if (!isalpha(c) && !isdigit(c)) {
1091                         switch (c) {
1092                         case '\'':
1093                         case '"':
1094                         case '`':
1095                         case ' ':
1096                         case '#':
1097                                 goto bad;
1098                         default:
1099                                 break;
1100                         }
1101                 }
1102         } while (*++cp);
1103         return (1);
1104
1105 bad:    fprintf(stderr, "%s: invalid user name\n", cp0);
1106         return (0);
1107 }
1108
1109 BUF *
1110 allocbuf(bp, fd, blksize)
1111         BUF *bp;
1112         int fd, blksize;
1113 {
1114         size_t size;
1115 #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
1116         struct stat stb;
1117
1118         if (fstat(fd, &stb) < 0) {
1119                 run_err("fstat: %s", strerror(errno));
1120                 return (0);
1121         }
1122         size = roundup(stb.st_blksize, blksize);
1123         if (size == 0)
1124                 size = blksize;
1125 #else /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1126         size = blksize;
1127 #endif /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1128         if (bp->cnt >= size)
1129                 return (bp);
1130         if (bp->buf == NULL)
1131                 bp->buf = xmalloc(size);
1132         else
1133                 bp->buf = xrealloc(bp->buf, size);
1134         memset(bp->buf, 0, size);
1135         bp->cnt = size;
1136         return (bp);
1137 }
1138
1139 void
1140 lostconn(signo)
1141         int signo;
1142 {
1143         if (!iamremote)
1144                 write(STDERR_FILENO, "lost connection\n", 16);
1145         if (signo)
1146                 _exit(1);
1147         else
1148                 exit(1);
1149 }
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