1/* $OpenBSD: scp.c,v 1.204 2019/02/10 11:15:52 djm Exp $ */
2/*
3 * scp - secure remote copy.  This is basically patched BSD rcp which
4 * uses ssh to do the data transfer (instead of using rcmd).
5 *
6 * NOTE: This version should NOT be suid root.  (This uses ssh to
7 * do the transfer and ssh has the necessary privileges.)
8 *
9 * 1995 Timo Rinne <tri@iki.fi>, Tatu Ylonen <ylo@cs.hut.fi>
10 *
11 * As far as I am concerned, the code I have written for this software
12 * can be used freely for any purpose.  Any derived versions of this
13 * software must be clearly marked as such, and if the derived work is
14 * incompatible with the protocol description in the RFC file, it must be
15 * called by a name other than "ssh" or "Secure Shell".
16 */
17/*
18 * Copyright (c) 1999 Theo de Raadt.  All rights reserved.
19 * Copyright (c) 1999 Aaron Campbell.  All rights reserved.
20 *
21 * Redistribution and use in source and binary forms, with or without
22 * modification, are permitted provided that the following conditions
23 * are met:
24 * 1. Redistributions of source code must retain the above copyright
25 *    notice, this list of conditions and the following disclaimer.
26 * 2. Redistributions in binary form must reproduce the above copyright
27 *    notice, this list of conditions and the following disclaimer in the
28 *    documentation and/or other materials provided with the distribution.
29 *
30 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
31 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
32 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
33 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
34 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
35 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
36 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
37 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
38 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
39 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
40 */
41
42/*
43 * Parts from:
44 *
45 * Copyright (c) 1983, 1990, 1992, 1993, 1995
46 *	The Regents of the University of California.  All rights reserved.
47 *
48 * Redistribution and use in source and binary forms, with or without
49 * modification, are permitted provided that the following conditions
50 * are met:
51 * 1. Redistributions of source code must retain the above copyright
52 *    notice, this list of conditions and the following disclaimer.
53 * 2. Redistributions in binary form must reproduce the above copyright
54 *    notice, this list of conditions and the following disclaimer in the
55 *    documentation and/or other materials provided with the distribution.
56 * 3. Neither the name of the University nor the names of its contributors
57 *    may be used to endorse or promote products derived from this software
58 *    without specific prior written permission.
59 *
60 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
61 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
62 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
63 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
64 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
65 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
66 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
67 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
68 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
69 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
70 * SUCH DAMAGE.
71 *
72 */
73
74#include "includes.h"
75
76#include <sys/types.h>
77#ifdef HAVE_SYS_STAT_H
78# include <sys/stat.h>
79#endif
80#ifdef HAVE_POLL_H
81#include <poll.h>
82#else
83# ifdef HAVE_SYS_POLL_H
84#  include <sys/poll.h>
85# endif
86#endif
87#ifdef HAVE_SYS_TIME_H
88# include <sys/time.h>
89#endif
90#include <sys/wait.h>
91#include <sys/uio.h>
92
93#include <ctype.h>
94#include <dirent.h>
95#include <errno.h>
96#include <fcntl.h>
97#include <fnmatch.h>
98#include <limits.h>
99#include <locale.h>
100#include <pwd.h>
101#include <signal.h>
102#include <stdarg.h>
103#ifdef HAVE_STDINT_H
104#include <stdint.h>
105#endif
106#include <stdio.h>
107#include <stdlib.h>
108#include <string.h>
109#include <time.h>
110#include <unistd.h>
111#if defined(HAVE_STRNVIS) && defined(HAVE_VIS_H) && !defined(BROKEN_STRNVIS)
112#include <vis.h>
113#endif
114
115#include "xmalloc.h"
116#include "ssh.h"
117#include "atomicio.h"
118#include "pathnames.h"
119#include "log.h"
120#include "misc.h"
121#include "progressmeter.h"
122#include "utf8.h"
123
124extern char *__progname;
125
126#define COPY_BUFLEN	16384
127
128int do_cmd(char *host, char *remuser, int port, char *cmd, int *fdin, int *fdout);
129int do_cmd2(char *host, char *remuser, int port, char *cmd, int fdin, int fdout);
130
131/* Struct for addargs */
132arglist args;
133arglist remote_remote_args;
134
135/* Bandwidth limit */
136long long limit_kbps = 0;
137struct bwlimit bwlimit;
138
139/* Name of current file being transferred. */
140char *curfile;
141
142/* This is set to non-zero to enable verbose mode. */
143int verbose_mode = 0;
144
145/* This is set to zero if the progressmeter is not desired. */
146int showprogress = 1;
147
148/*
149 * This is set to non-zero if remote-remote copy should be piped
150 * through this process.
151 */
152int throughlocal = 0;
153
154/* Non-standard port to use for the ssh connection or -1. */
155int sshport = -1;
156
157/* This is the program to execute for the secured connection. ("ssh" or -S) */
158char *ssh_program = _PATH_SSH_PROGRAM;
159
160/* This is used to store the pid of ssh_program */
161pid_t do_cmd_pid = -1;
162
163static void
164killchild(int signo)
165{
166	if (do_cmd_pid > 1) {
167		kill(do_cmd_pid, signo ? signo : SIGTERM);
168		waitpid(do_cmd_pid, NULL, 0);
169	}
170
171	if (signo)
172		_exit(1);
173	exit(1);
174}
175
176static void
177suspchild(int signo)
178{
179	int status;
180
181	if (do_cmd_pid > 1) {
182		kill(do_cmd_pid, signo);
183		while (waitpid(do_cmd_pid, &status, WUNTRACED) == -1 &&
184		    errno == EINTR)
185			;
186		kill(getpid(), SIGSTOP);
187	}
188}
189
190static int
191do_local_cmd(arglist *a)
192{
193	u_int i;
194	int status;
195	pid_t pid;
196
197	if (a->num == 0)
198		fatal("do_local_cmd: no arguments");
199
200	if (verbose_mode) {
201		fprintf(stderr, "Executing:");
202		for (i = 0; i < a->num; i++)
203			fmprintf(stderr, " %s", a->list[i]);
204		fprintf(stderr, "\n");
205	}
206	if ((pid = fork()) == -1)
207		fatal("do_local_cmd: fork: %s", strerror(errno));
208
209	if (pid == 0) {
210		execvp(a->list[0], a->list);
211		perror(a->list[0]);
212		exit(1);
213	}
214
215	do_cmd_pid = pid;
216	signal(SIGTERM, killchild);
217	signal(SIGINT, killchild);
218	signal(SIGHUP, killchild);
219
220	while (waitpid(pid, &status, 0) == -1)
221		if (errno != EINTR)
222			fatal("do_local_cmd: waitpid: %s", strerror(errno));
223
224	do_cmd_pid = -1;
225
226	if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
227		return (-1);
228
229	return (0);
230}
231
232/*
233 * This function executes the given command as the specified user on the
234 * given host.  This returns < 0 if execution fails, and >= 0 otherwise. This
235 * assigns the input and output file descriptors on success.
236 */
237
238int
239do_cmd(char *host, char *remuser, int port, char *cmd, int *fdin, int *fdout)
240{
241	int pin[2], pout[2], reserved[2];
242
243	if (verbose_mode)
244		fmprintf(stderr,
245		    "Executing: program %s host %s, user %s, command %s\n",
246		    ssh_program, host,
247		    remuser ? remuser : "(unspecified)", cmd);
248
249	if (port == -1)
250		port = sshport;
251
252	/*
253	 * Reserve two descriptors so that the real pipes won't get
254	 * descriptors 0 and 1 because that will screw up dup2 below.
255	 */
256	if (pipe(reserved) < 0)
257		fatal("pipe: %s", strerror(errno));
258
259	/* Create a socket pair for communicating with ssh. */
260	if (pipe(pin) < 0)
261		fatal("pipe: %s", strerror(errno));
262	if (pipe(pout) < 0)
263		fatal("pipe: %s", strerror(errno));
264
265	/* Free the reserved descriptors. */
266	close(reserved[0]);
267	close(reserved[1]);
268
269	signal(SIGTSTP, suspchild);
270	signal(SIGTTIN, suspchild);
271	signal(SIGTTOU, suspchild);
272
273	/* Fork a child to execute the command on the remote host using ssh. */
274	do_cmd_pid = fork();
275	if (do_cmd_pid == 0) {
276		/* Child. */
277		close(pin[1]);
278		close(pout[0]);
279		dup2(pin[0], 0);
280		dup2(pout[1], 1);
281		close(pin[0]);
282		close(pout[1]);
283
284		replacearg(&args, 0, "%s", ssh_program);
285		if (port != -1) {
286			addargs(&args, "-p");
287			addargs(&args, "%d", port);
288		}
289		if (remuser != NULL) {
290			addargs(&args, "-l");
291			addargs(&args, "%s", remuser);
292		}
293		addargs(&args, "--");
294		addargs(&args, "%s", host);
295		addargs(&args, "%s", cmd);
296
297		execvp(ssh_program, args.list);
298		perror(ssh_program);
299		exit(1);
300	} else if (do_cmd_pid == -1) {
301		fatal("fork: %s", strerror(errno));
302	}
303	/* Parent.  Close the other side, and return the local side. */
304	close(pin[0]);
305	*fdout = pin[1];
306	close(pout[1]);
307	*fdin = pout[0];
308	signal(SIGTERM, killchild);
309	signal(SIGINT, killchild);
310	signal(SIGHUP, killchild);
311	return 0;
312}
313
314/*
315 * This function executes a command similar to do_cmd(), but expects the
316 * input and output descriptors to be setup by a previous call to do_cmd().
317 * This way the input and output of two commands can be connected.
318 */
319int
320do_cmd2(char *host, char *remuser, int port, char *cmd, int fdin, int fdout)
321{
322	pid_t pid;
323	int status;
324
325	if (verbose_mode)
326		fmprintf(stderr,
327		    "Executing: 2nd program %s host %s, user %s, command %s\n",
328		    ssh_program, host,
329		    remuser ? remuser : "(unspecified)", cmd);
330
331	if (port == -1)
332		port = sshport;
333
334	/* Fork a child to execute the command on the remote host using ssh. */
335	pid = fork();
336	if (pid == 0) {
337		dup2(fdin, 0);
338		dup2(fdout, 1);
339
340		replacearg(&args, 0, "%s", ssh_program);
341		if (port != -1) {
342			addargs(&args, "-p");
343			addargs(&args, "%d", port);
344		}
345		if (remuser != NULL) {
346			addargs(&args, "-l");
347			addargs(&args, "%s", remuser);
348		}
349		addargs(&args, "--");
350		addargs(&args, "%s", host);
351		addargs(&args, "%s", cmd);
352
353		execvp(ssh_program, args.list);
354		perror(ssh_program);
355		exit(1);
356	} else if (pid == -1) {
357		fatal("fork: %s", strerror(errno));
358	}
359	while (waitpid(pid, &status, 0) == -1)
360		if (errno != EINTR)
361			fatal("do_cmd2: waitpid: %s", strerror(errno));
362	return 0;
363}
364
365typedef struct {
366	size_t cnt;
367	char *buf;
368} BUF;
369
370BUF *allocbuf(BUF *, int, int);
371void lostconn(int);
372int okname(char *);
373void run_err(const char *,...);
374void verifydir(char *);
375
376struct passwd *pwd;
377uid_t userid;
378int errs, remin, remout;
379int Tflag, pflag, iamremote, iamrecursive, targetshouldbedirectory;
380
381#define	CMDNEEDS	64
382char cmd[CMDNEEDS];		/* must hold "rcp -r -p -d\0" */
383
384int response(void);
385void rsource(char *, struct stat *);
386void sink(int, char *[], const char *);
387void source(int, char *[]);
388void tolocal(int, char *[]);
389void toremote(int, char *[]);
390void usage(void);
391
392int
393main(int argc, char **argv)
394{
395	int ch, fflag, tflag, status, n;
396	char **newargv;
397	const char *errstr;
398	extern char *optarg;
399	extern int optind;
400
401	/* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
402	sanitise_stdfd();
403
404	msetlocale();
405
406	/* Copy argv, because we modify it */
407	newargv = xcalloc(MAXIMUM(argc + 1, 1), sizeof(*newargv));
408	for (n = 0; n < argc; n++)
409		newargv[n] = xstrdup(argv[n]);
410	argv = newargv;
411
412	__progname = ssh_get_progname(argv[0]);
413
414	memset(&args, '\0', sizeof(args));
415	memset(&remote_remote_args, '\0', sizeof(remote_remote_args));
416	args.list = remote_remote_args.list = NULL;
417	addargs(&args, "%s", ssh_program);
418	addargs(&args, "-x");
419	addargs(&args, "-oForwardAgent=no");
420	addargs(&args, "-oPermitLocalCommand=no");
421	addargs(&args, "-oClearAllForwardings=yes");
422	addargs(&args, "-oRemoteCommand=none");
423	addargs(&args, "-oRequestTTY=no");
424
425	fflag = Tflag = tflag = 0;
426	while ((ch = getopt(argc, argv,
427	    "dfl:prtTvBCc:i:P:q12346S:o:F:")) != -1) {
428		switch (ch) {
429		/* User-visible flags. */
430		case '1':
431			fatal("SSH protocol v.1 is no longer supported");
432			break;
433		case '2':
434			/* Ignored */
435			break;
436		case '4':
437		case '6':
438		case 'C':
439			addargs(&args, "-%c", ch);
440			addargs(&remote_remote_args, "-%c", ch);
441			break;
442		case '3':
443			throughlocal = 1;
444			break;
445		case 'o':
446		case 'c':
447		case 'i':
448		case 'F':
449			addargs(&remote_remote_args, "-%c", ch);
450			addargs(&remote_remote_args, "%s", optarg);
451			addargs(&args, "-%c", ch);
452			addargs(&args, "%s", optarg);
453			break;
454		case 'P':
455			sshport = a2port(optarg);
456			if (sshport <= 0)
457				fatal("bad port \"%s\"\n", optarg);
458			break;
459		case 'B':
460			addargs(&remote_remote_args, "-oBatchmode=yes");
461			addargs(&args, "-oBatchmode=yes");
462			break;
463		case 'l':
464			limit_kbps = strtonum(optarg, 1, 100 * 1024 * 1024,
465			    &errstr);
466			if (errstr != NULL)
467				usage();
468			limit_kbps *= 1024; /* kbps */
469			bandwidth_limit_init(&bwlimit, limit_kbps, COPY_BUFLEN);
470			break;
471		case 'p':
472			pflag = 1;
473			break;
474		case 'r':
475			iamrecursive = 1;
476			break;
477		case 'S':
478			ssh_program = xstrdup(optarg);
479			break;
480		case 'v':
481			addargs(&args, "-v");
482			addargs(&remote_remote_args, "-v");
483			verbose_mode = 1;
484			break;
485		case 'q':
486			addargs(&args, "-q");
487			addargs(&remote_remote_args, "-q");
488			showprogress = 0;
489			break;
490
491		/* Server options. */
492		case 'd':
493			targetshouldbedirectory = 1;
494			break;
495		case 'f':	/* "from" */
496			iamremote = 1;
497			fflag = 1;
498			break;
499		case 't':	/* "to" */
500			iamremote = 1;
501			tflag = 1;
502#ifdef HAVE_CYGWIN
503			setmode(0, O_BINARY);
504#endif
505			break;
506		case 'T':
507			Tflag = 1;
508			break;
509		default:
510			usage();
511		}
512	}
513	argc -= optind;
514	argv += optind;
515
516	if ((pwd = getpwuid(userid = getuid())) == NULL)
517		fatal("unknown user %u", (u_int) userid);
518
519	if (!isatty(STDOUT_FILENO))
520		showprogress = 0;
521
522	if (pflag) {
523		/* Cannot pledge: -p allows setuid/setgid files... */
524	} else {
525		if (pledge("stdio rpath wpath cpath fattr tty proc exec",
526		    NULL) == -1) {
527			perror("pledge");
528			exit(1);
529		}
530	}
531
532	remin = STDIN_FILENO;
533	remout = STDOUT_FILENO;
534
535	if (fflag) {
536		/* Follow "protocol", send data. */
537		(void) response();
538		source(argc, argv);
539		exit(errs != 0);
540	}
541	if (tflag) {
542		/* Receive data. */
543		sink(argc, argv, NULL);
544		exit(errs != 0);
545	}
546	if (argc < 2)
547		usage();
548	if (argc > 2)
549		targetshouldbedirectory = 1;
550
551	remin = remout = -1;
552	do_cmd_pid = -1;
553	/* Command to be executed on remote system using "ssh". */
554	(void) snprintf(cmd, sizeof cmd, "scp%s%s%s%s",
555	    verbose_mode ? " -v" : "",
556	    iamrecursive ? " -r" : "", pflag ? " -p" : "",
557	    targetshouldbedirectory ? " -d" : "");
558
559	(void) signal(SIGPIPE, lostconn);
560
561	if (colon(argv[argc - 1]))	/* Dest is remote host. */
562		toremote(argc, argv);
563	else {
564		if (targetshouldbedirectory)
565			verifydir(argv[argc - 1]);
566		tolocal(argc, argv);	/* Dest is local host. */
567	}
568	/*
569	 * Finally check the exit status of the ssh process, if one was forked
570	 * and no error has occurred yet
571	 */
572	if (do_cmd_pid != -1 && errs == 0) {
573		if (remin != -1)
574		    (void) close(remin);
575		if (remout != -1)
576		    (void) close(remout);
577		if (waitpid(do_cmd_pid, &status, 0) == -1)
578			errs = 1;
579		else {
580			if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
581				errs = 1;
582		}
583	}
584	exit(errs != 0);
585}
586
587/* Callback from atomicio6 to update progress meter and limit bandwidth */
588static int
589scpio(void *_cnt, size_t s)
590{
591	off_t *cnt = (off_t *)_cnt;
592
593	*cnt += s;
594	if (limit_kbps > 0)
595		bandwidth_limit(&bwlimit, s);
596	return 0;
597}
598
599static int
600do_times(int fd, int verb, const struct stat *sb)
601{
602	/* strlen(2^64) == 20; strlen(10^6) == 7 */
603	char buf[(20 + 7 + 2) * 2 + 2];
604
605	(void)snprintf(buf, sizeof(buf), "T%llu 0 %llu 0\n",
606	    (unsigned long long) (sb->st_mtime < 0 ? 0 : sb->st_mtime),
607	    (unsigned long long) (sb->st_atime < 0 ? 0 : sb->st_atime));
608	if (verb) {
609		fprintf(stderr, "File mtime %lld atime %lld\n",
610		    (long long)sb->st_mtime, (long long)sb->st_atime);
611		fprintf(stderr, "Sending file timestamps: %s", buf);
612	}
613	(void) atomicio(vwrite, fd, buf, strlen(buf));
614	return (response());
615}
616
617static int
618parse_scp_uri(const char *uri, char **userp, char **hostp, int *portp,
619     char **pathp)
620{
621	int r;
622
623	r = parse_uri("scp", uri, userp, hostp, portp, pathp);
624	if (r == 0 && *pathp == NULL)
625		*pathp = xstrdup(".");
626	return r;
627}
628
629/* Appends a string to an array; returns 0 on success, -1 on alloc failure */
630static int
631append(char *cp, char ***ap, size_t *np)
632{
633	char **tmp;
634
635	if ((tmp = reallocarray(*ap, *np + 1, sizeof(*tmp))) == NULL)
636		return -1;
637	tmp[(*np)] = cp;
638	(*np)++;
639	*ap = tmp;
640	return 0;
641}
642
643/*
644 * Finds the start and end of the first brace pair in the pattern.
645 * returns 0 on success or -1 for invalid patterns.
646 */
647static int
648find_brace(const char *pattern, int *startp, int *endp)
649{
650	int i;
651	int in_bracket, brace_level;
652
653	*startp = *endp = -1;
654	in_bracket = brace_level = 0;
655	for (i = 0; i < INT_MAX && *endp < 0 && pattern[i] != '\0'; i++) {
656		switch (pattern[i]) {
657		case '\\':
658			/* skip next character */
659			if (pattern[i + 1] != '\0')
660				i++;
661			break;
662		case '[':
663			in_bracket = 1;
664			break;
665		case ']':
666			in_bracket = 0;
667			break;
668		case '{':
669			if (in_bracket)
670				break;
671			if (pattern[i + 1] == '}') {
672				/* Protect a single {}, for find(1), like csh */
673				i++; /* skip */
674				break;
675			}
676			if (*startp == -1)
677				*startp = i;
678			brace_level++;
679			break;
680		case '}':
681			if (in_bracket)
682				break;
683			if (*startp < 0) {
684				/* Unbalanced brace */
685				return -1;
686			}
687			if (--brace_level <= 0)
688				*endp = i;
689			break;
690		}
691	}
692	/* unbalanced brackets/braces */
693	if (*endp < 0 && (*startp >= 0 || in_bracket))
694		return -1;
695	return 0;
696}
697
698/*
699 * Assembles and records a successfully-expanded pattern, returns -1 on
700 * alloc failure.
701 */
702static int
703emit_expansion(const char *pattern, int brace_start, int brace_end,
704    int sel_start, int sel_end, char ***patternsp, size_t *npatternsp)
705{
706	char *cp;
707	int o = 0, tail_len = strlen(pattern + brace_end + 1);
708
709	if ((cp = malloc(brace_start + (sel_end - sel_start) +
710	    tail_len + 1)) == NULL)
711		return -1;
712
713	/* Pattern before initial brace */
714	if (brace_start > 0) {
715		memcpy(cp, pattern, brace_start);
716		o = brace_start;
717	}
718	/* Current braced selection */
719	if (sel_end - sel_start > 0) {
720		memcpy(cp + o, pattern + sel_start,
721		    sel_end - sel_start);
722		o += sel_end - sel_start;
723	}
724	/* Remainder of pattern after closing brace */
725	if (tail_len > 0) {
726		memcpy(cp + o, pattern + brace_end + 1, tail_len);
727		o += tail_len;
728	}
729	cp[o] = '\0';
730	if (append(cp, patternsp, npatternsp) != 0) {
731		free(cp);
732		return -1;
733	}
734	return 0;
735}
736
737/*
738 * Expand the first encountered brace in pattern, appending the expanded
739 * patterns it yielded to the *patternsp array.
740 *
741 * Returns 0 on success or -1 on allocation failure.
742 *
743 * Signals whether expansion was performed via *expanded and whether
744 * pattern was invalid via *invalid.
745 */
746static int
747brace_expand_one(const char *pattern, char ***patternsp, size_t *npatternsp,
748    int *expanded, int *invalid)
749{
750	int i;
751	int in_bracket, brace_start, brace_end, brace_level;
752	int sel_start, sel_end;
753
754	*invalid = *expanded = 0;
755
756	if (find_brace(pattern, &brace_start, &brace_end) != 0) {
757		*invalid = 1;
758		return 0;
759	} else if (brace_start == -1)
760		return 0;
761
762	in_bracket = brace_level = 0;
763	for (i = sel_start = brace_start + 1; i < brace_end; i++) {
764		switch (pattern[i]) {
765		case '{':
766			if (in_bracket)
767				break;
768			brace_level++;
769			break;
770		case '}':
771			if (in_bracket)
772				break;
773			brace_level--;
774			break;
775		case '[':
776			in_bracket = 1;
777			break;
778		case ']':
779			in_bracket = 0;
780			break;
781		case '\\':
782			if (i < brace_end - 1)
783				i++; /* skip */
784			break;
785		}
786		if (pattern[i] == ',' || i == brace_end - 1) {
787			if (in_bracket || brace_level > 0)
788				continue;
789			/* End of a selection, emit an expanded pattern */
790
791			/* Adjust end index for last selection */
792			sel_end = (i == brace_end - 1) ? brace_end : i;
793			if (emit_expansion(pattern, brace_start, brace_end,
794			    sel_start, sel_end, patternsp, npatternsp) != 0)
795				return -1;
796			/* move on to the next selection */
797			sel_start = i + 1;
798			continue;
799		}
800	}
801	if (in_bracket || brace_level > 0) {
802		*invalid = 1;
803		return 0;
804	}
805	/* success */
806	*expanded = 1;
807	return 0;
808}
809
810/* Expand braces from pattern. Returns 0 on success, -1 on failure */
811static int
812brace_expand(const char *pattern, char ***patternsp, size_t *npatternsp)
813{
814	char *cp, *cp2, **active = NULL, **done = NULL;
815	size_t i, nactive = 0, ndone = 0;
816	int ret = -1, invalid = 0, expanded = 0;
817
818	*patternsp = NULL;
819	*npatternsp = 0;
820
821	/* Start the worklist with the original pattern */
822	if ((cp = strdup(pattern)) == NULL)
823		return -1;
824	if (append(cp, &active, &nactive) != 0) {
825		free(cp);
826		return -1;
827	}
828	while (nactive > 0) {
829		cp = active[nactive - 1];
830		nactive--;
831		if (brace_expand_one(cp, &active, &nactive,
832		    &expanded, &invalid) == -1) {
833			free(cp);
834			goto fail;
835		}
836		if (invalid)
837			fatal("%s: invalid brace pattern \"%s\"", __func__, cp);
838		if (expanded) {
839			/*
840			 * Current entry expanded to new entries on the
841			 * active list; discard the progenitor pattern.
842			 */
843			free(cp);
844			continue;
845		}
846		/*
847		 * Pattern did not expand; append the finename component to
848		 * the completed list
849		 */
850		if ((cp2 = strrchr(cp, '/')) != NULL)
851			*cp2++ = '\0';
852		else
853			cp2 = cp;
854		if (append(xstrdup(cp2), &done, &ndone) != 0) {
855			free(cp);
856			goto fail;
857		}
858		free(cp);
859	}
860	/* success */
861	*patternsp = done;
862	*npatternsp = ndone;
863	done = NULL;
864	ndone = 0;
865	ret = 0;
866 fail:
867	for (i = 0; i < nactive; i++)
868		free(active[i]);
869	free(active);
870	for (i = 0; i < ndone; i++)
871		free(done[i]);
872	free(done);
873	return ret;
874}
875
876void
877toremote(int argc, char **argv)
878{
879	char *suser = NULL, *host = NULL, *src = NULL;
880	char *bp, *tuser, *thost, *targ;
881	int sport = -1, tport = -1;
882	arglist alist;
883	int i, r;
884	u_int j;
885
886	memset(&alist, '\0', sizeof(alist));
887	alist.list = NULL;
888
889	/* Parse target */
890	r = parse_scp_uri(argv[argc - 1], &tuser, &thost, &tport, &targ);
891	if (r == -1) {
892		fmprintf(stderr, "%s: invalid uri\n", argv[argc - 1]);
893		++errs;
894		goto out;
895	}
896	if (r != 0) {
897		if (parse_user_host_path(argv[argc - 1], &tuser, &thost,
898		    &targ) == -1) {
899			fmprintf(stderr, "%s: invalid target\n", argv[argc - 1]);
900			++errs;
901			goto out;
902		}
903	}
904	if (tuser != NULL && !okname(tuser)) {
905		++errs;
906		goto out;
907	}
908
909	/* Parse source files */
910	for (i = 0; i < argc - 1; i++) {
911		free(suser);
912		free(host);
913		free(src);
914		r = parse_scp_uri(argv[i], &suser, &host, &sport, &src);
915		if (r == -1) {
916			fmprintf(stderr, "%s: invalid uri\n", argv[i]);
917			++errs;
918			continue;
919		}
920		if (r != 0) {
921			parse_user_host_path(argv[i], &suser, &host, &src);
922		}
923		if (suser != NULL && !okname(suser)) {
924			++errs;
925			continue;
926		}
927		if (host && throughlocal) {	/* extended remote to remote */
928			xasprintf(&bp, "%s -f %s%s", cmd,
929			    *src == '-' ? "-- " : "", src);
930			if (do_cmd(host, suser, sport, bp, &remin, &remout) < 0)
931				exit(1);
932			free(bp);
933			xasprintf(&bp, "%s -t %s%s", cmd,
934			    *targ == '-' ? "-- " : "", targ);
935			if (do_cmd2(thost, tuser, tport, bp, remin, remout) < 0)
936				exit(1);
937			free(bp);
938			(void) close(remin);
939			(void) close(remout);
940			remin = remout = -1;
941		} else if (host) {	/* standard remote to remote */
942			if (tport != -1 && tport != SSH_DEFAULT_PORT) {
943				/* This would require the remote support URIs */
944				fatal("target port not supported with two "
945				    "remote hosts without the -3 option");
946			}
947
948			freeargs(&alist);
949			addargs(&alist, "%s", ssh_program);
950			addargs(&alist, "-x");
951			addargs(&alist, "-oClearAllForwardings=yes");
952			addargs(&alist, "-n");
953			for (j = 0; j < remote_remote_args.num; j++) {
954				addargs(&alist, "%s",
955				    remote_remote_args.list[j]);
956			}
957
958			if (sport != -1) {
959				addargs(&alist, "-p");
960				addargs(&alist, "%d", sport);
961			}
962			if (suser) {
963				addargs(&alist, "-l");
964				addargs(&alist, "%s", suser);
965			}
966			addargs(&alist, "--");
967			addargs(&alist, "%s", host);
968			addargs(&alist, "%s", cmd);
969			addargs(&alist, "%s", src);
970			addargs(&alist, "%s%s%s:%s",
971			    tuser ? tuser : "", tuser ? "@" : "",
972			    thost, targ);
973			if (do_local_cmd(&alist) != 0)
974				errs = 1;
975		} else {	/* local to remote */
976			if (remin == -1) {
977				xasprintf(&bp, "%s -t %s%s", cmd,
978				    *targ == '-' ? "-- " : "", targ);
979				if (do_cmd(thost, tuser, tport, bp, &remin,
980				    &remout) < 0)
981					exit(1);
982				if (response() < 0)
983					exit(1);
984				free(bp);
985			}
986			source(1, argv + i);
987		}
988	}
989out:
990	free(tuser);
991	free(thost);
992	free(targ);
993	free(suser);
994	free(host);
995	free(src);
996}
997
998void
999tolocal(int argc, char **argv)
1000{
1001	char *bp, *host = NULL, *src = NULL, *suser = NULL;
1002	arglist alist;
1003	int i, r, sport = -1;
1004
1005	memset(&alist, '\0', sizeof(alist));
1006	alist.list = NULL;
1007
1008	for (i = 0; i < argc - 1; i++) {
1009		free(suser);
1010		free(host);
1011		free(src);
1012		r = parse_scp_uri(argv[i], &suser, &host, &sport, &src);
1013		if (r == -1) {
1014			fmprintf(stderr, "%s: invalid uri\n", argv[i]);
1015			++errs;
1016			continue;
1017		}
1018		if (r != 0)
1019			parse_user_host_path(argv[i], &suser, &host, &src);
1020		if (suser != NULL && !okname(suser)) {
1021			++errs;
1022			continue;
1023		}
1024		if (!host) {	/* Local to local. */
1025			freeargs(&alist);
1026			addargs(&alist, "%s", _PATH_CP);
1027			if (iamrecursive)
1028				addargs(&alist, "-r");
1029			if (pflag)
1030				addargs(&alist, "-p");
1031			addargs(&alist, "--");
1032			addargs(&alist, "%s", argv[i]);
1033			addargs(&alist, "%s", argv[argc-1]);
1034			if (do_local_cmd(&alist))
1035				++errs;
1036			continue;
1037		}
1038		/* Remote to local. */
1039		xasprintf(&bp, "%s -f %s%s",
1040		    cmd, *src == '-' ? "-- " : "", src);
1041		if (do_cmd(host, suser, sport, bp, &remin, &remout) < 0) {
1042			free(bp);
1043			++errs;
1044			continue;
1045		}
1046		free(bp);
1047		sink(1, argv + argc - 1, src);
1048		(void) close(remin);
1049		remin = remout = -1;
1050	}
1051	free(suser);
1052	free(host);
1053	free(src);
1054}
1055
1056void
1057source(int argc, char **argv)
1058{
1059	struct stat stb;
1060	static BUF buffer;
1061	BUF *bp;
1062	off_t i, statbytes;
1063	size_t amt, nr;
1064	int fd = -1, haderr, indx;
1065	char *last, *name, buf[2048], encname[PATH_MAX];
1066	int len;
1067
1068	for (indx = 0; indx < argc; ++indx) {
1069		name = argv[indx];
1070		statbytes = 0;
1071		len = strlen(name);
1072		while (len > 1 && name[len-1] == '/')
1073			name[--len] = '\0';
1074		if ((fd = open(name, O_RDONLY|O_NONBLOCK, 0)) < 0)
1075			goto syserr;
1076		if (strchr(name, '\n') != NULL) {
1077			strnvis(encname, name, sizeof(encname), VIS_NL);
1078			name = encname;
1079		}
1080		if (fstat(fd, &stb) < 0) {
1081syserr:			run_err("%s: %s", name, strerror(errno));
1082			goto next;
1083		}
1084		if (stb.st_size < 0) {
1085			run_err("%s: %s", name, "Negative file size");
1086			goto next;
1087		}
1088		unset_nonblock(fd);
1089		switch (stb.st_mode & S_IFMT) {
1090		case S_IFREG:
1091			break;
1092		case S_IFDIR:
1093			if (iamrecursive) {
1094				rsource(name, &stb);
1095				goto next;
1096			}
1097			/* FALLTHROUGH */
1098		default:
1099			run_err("%s: not a regular file", name);
1100			goto next;
1101		}
1102		if ((last = strrchr(name, '/')) == NULL)
1103			last = name;
1104		else
1105			++last;
1106		curfile = last;
1107		if (pflag) {
1108			if (do_times(remout, verbose_mode, &stb) < 0)
1109				goto next;
1110		}
1111#define	FILEMODEMASK	(S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO)
1112		snprintf(buf, sizeof buf, "C%04o %lld %s\n",
1113		    (u_int) (stb.st_mode & FILEMODEMASK),
1114		    (long long)stb.st_size, last);
1115		if (verbose_mode)
1116			fmprintf(stderr, "Sending file modes: %s", buf);
1117		(void) atomicio(vwrite, remout, buf, strlen(buf));
1118		if (response() < 0)
1119			goto next;
1120		if ((bp = allocbuf(&buffer, fd, COPY_BUFLEN)) == NULL) {
1121next:			if (fd != -1) {
1122				(void) close(fd);
1123				fd = -1;
1124			}
1125			continue;
1126		}
1127		if (showprogress)
1128			start_progress_meter(curfile, stb.st_size, &statbytes);
1129		set_nonblock(remout);
1130		for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
1131			amt = bp->cnt;
1132			if (i + (off_t)amt > stb.st_size)
1133				amt = stb.st_size - i;
1134			if (!haderr) {
1135				if ((nr = atomicio(read, fd,
1136				    bp->buf, amt)) != amt) {
1137					haderr = errno;
1138					memset(bp->buf + nr, 0, amt - nr);
1139				}
1140			}
1141			/* Keep writing after error to retain sync */
1142			if (haderr) {
1143				(void)atomicio(vwrite, remout, bp->buf, amt);
1144				memset(bp->buf, 0, amt);
1145				continue;
1146			}
1147			if (atomicio6(vwrite, remout, bp->buf, amt, scpio,
1148			    &statbytes) != amt)
1149				haderr = errno;
1150		}
1151		unset_nonblock(remout);
1152
1153		if (fd != -1) {
1154			if (close(fd) < 0 && !haderr)
1155				haderr = errno;
1156			fd = -1;
1157		}
1158		if (!haderr)
1159			(void) atomicio(vwrite, remout, "", 1);
1160		else
1161			run_err("%s: %s", name, strerror(haderr));
1162		(void) response();
1163		if (showprogress)
1164			stop_progress_meter();
1165	}
1166}
1167
1168void
1169rsource(char *name, struct stat *statp)
1170{
1171	DIR *dirp;
1172	struct dirent *dp;
1173	char *last, *vect[1], path[PATH_MAX];
1174
1175	if (!(dirp = opendir(name))) {
1176		run_err("%s: %s", name, strerror(errno));
1177		return;
1178	}
1179	last = strrchr(name, '/');
1180	if (last == NULL)
1181		last = name;
1182	else
1183		last++;
1184	if (pflag) {
1185		if (do_times(remout, verbose_mode, statp) < 0) {
1186			closedir(dirp);
1187			return;
1188		}
1189	}
1190	(void) snprintf(path, sizeof path, "D%04o %d %.1024s\n",
1191	    (u_int) (statp->st_mode & FILEMODEMASK), 0, last);
1192	if (verbose_mode)
1193		fmprintf(stderr, "Entering directory: %s", path);
1194	(void) atomicio(vwrite, remout, path, strlen(path));
1195	if (response() < 0) {
1196		closedir(dirp);
1197		return;
1198	}
1199	while ((dp = readdir(dirp)) != NULL) {
1200		if (dp->d_ino == 0)
1201			continue;
1202		if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
1203			continue;
1204		if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path) - 1) {
1205			run_err("%s/%s: name too long", name, dp->d_name);
1206			continue;
1207		}
1208		(void) snprintf(path, sizeof path, "%s/%s", name, dp->d_name);
1209		vect[0] = path;
1210		source(1, vect);
1211	}
1212	(void) closedir(dirp);
1213	(void) atomicio(vwrite, remout, "E\n", 2);
1214	(void) response();
1215}
1216
1217#define TYPE_OVERFLOW(type, val) \
1218	((sizeof(type) == 4 && (val) > INT32_MAX) || \
1219	 (sizeof(type) == 8 && (val) > INT64_MAX) || \
1220	 (sizeof(type) != 4 && sizeof(type) != 8))
1221
1222void
1223sink(int argc, char **argv, const char *src)
1224{
1225	static BUF buffer;
1226	struct stat stb;
1227	enum {
1228		YES, NO, DISPLAYED
1229	} wrerr;
1230	BUF *bp;
1231	off_t i;
1232	size_t j, count;
1233	int amt, exists, first, ofd;
1234	mode_t mode, omode, mask;
1235	off_t size, statbytes;
1236	unsigned long long ull;
1237	int setimes, targisdir, wrerrno = 0;
1238	char ch, *cp, *np, *targ, *why, *vect[1], buf[2048], visbuf[2048];
1239	char **patterns = NULL;
1240	size_t n, npatterns = 0;
1241	struct timeval tv[2];
1242
1243#define	atime	tv[0]
1244#define	mtime	tv[1]
1245#define	SCREWUP(str)	{ why = str; goto screwup; }
1246
1247	if (TYPE_OVERFLOW(time_t, 0) || TYPE_OVERFLOW(off_t, 0))
1248		SCREWUP("Unexpected off_t/time_t size");
1249
1250	setimes = targisdir = 0;
1251	mask = umask(0);
1252	if (!pflag)
1253		(void) umask(mask);
1254	if (argc != 1) {
1255		run_err("ambiguous target");
1256		exit(1);
1257	}
1258	targ = *argv;
1259	if (targetshouldbedirectory)
1260		verifydir(targ);
1261
1262	(void) atomicio(vwrite, remout, "", 1);
1263	if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
1264		targisdir = 1;
1265	if (src != NULL && !iamrecursive && !Tflag) {
1266		/*
1267		 * Prepare to try to restrict incoming filenames to match
1268		 * the requested destination file glob.
1269		 */
1270		if (brace_expand(src, &patterns, &npatterns) != 0)
1271			fatal("%s: could not expand pattern", __func__);
1272	}
1273	for (first = 1;; first = 0) {
1274		cp = buf;
1275		if (atomicio(read, remin, cp, 1) != 1)
1276			goto done;
1277		if (*cp++ == '\n')
1278			SCREWUP("unexpected <newline>");
1279		do {
1280			if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
1281				SCREWUP("lost connection");
1282			*cp++ = ch;
1283		} while (cp < &buf[sizeof(buf) - 1] && ch != '\n');
1284		*cp = 0;
1285		if (verbose_mode)
1286			fmprintf(stderr, "Sink: %s", buf);
1287
1288		if (buf[0] == '\01' || buf[0] == '\02') {
1289			if (iamremote == 0) {
1290				(void) snmprintf(visbuf, sizeof(visbuf),
1291				    NULL, "%s", buf + 1);
1292				(void) atomicio(vwrite, STDERR_FILENO,
1293				    visbuf, strlen(visbuf));
1294			}
1295			if (buf[0] == '\02')
1296				exit(1);
1297			++errs;
1298			continue;
1299		}
1300		if (buf[0] == 'E') {
1301			(void) atomicio(vwrite, remout, "", 1);
1302			goto done;
1303		}
1304		if (ch == '\n')
1305			*--cp = 0;
1306
1307		cp = buf;
1308		if (*cp == 'T') {
1309			setimes++;
1310			cp++;
1311			if (!isdigit((unsigned char)*cp))
1312				SCREWUP("mtime.sec not present");
1313			ull = strtoull(cp, &cp, 10);
1314			if (!cp || *cp++ != ' ')
1315				SCREWUP("mtime.sec not delimited");
1316			if (TYPE_OVERFLOW(time_t, ull))
1317				setimes = 0;	/* out of range */
1318			mtime.tv_sec = ull;
1319			mtime.tv_usec = strtol(cp, &cp, 10);
1320			if (!cp || *cp++ != ' ' || mtime.tv_usec < 0 ||
1321			    mtime.tv_usec > 999999)
1322				SCREWUP("mtime.usec not delimited");
1323			if (!isdigit((unsigned char)*cp))
1324				SCREWUP("atime.sec not present");
1325			ull = strtoull(cp, &cp, 10);
1326			if (!cp || *cp++ != ' ')
1327				SCREWUP("atime.sec not delimited");
1328			if (TYPE_OVERFLOW(time_t, ull))
1329				setimes = 0;	/* out of range */
1330			atime.tv_sec = ull;
1331			atime.tv_usec = strtol(cp, &cp, 10);
1332			if (!cp || *cp++ != '\0' || atime.tv_usec < 0 ||
1333			    atime.tv_usec > 999999)
1334				SCREWUP("atime.usec not delimited");
1335			(void) atomicio(vwrite, remout, "", 1);
1336			continue;
1337		}
1338		if (*cp != 'C' && *cp != 'D') {
1339			/*
1340			 * Check for the case "rcp remote:foo\* local:bar".
1341			 * In this case, the line "No match." can be returned
1342			 * by the shell before the rcp command on the remote is
1343			 * executed so the ^Aerror_message convention isn't
1344			 * followed.
1345			 */
1346			if (first) {
1347				run_err("%s", cp);
1348				exit(1);
1349			}
1350			SCREWUP("expected control record");
1351		}
1352		mode = 0;
1353		for (++cp; cp < buf + 5; cp++) {
1354			if (*cp < '0' || *cp > '7')
1355				SCREWUP("bad mode");
1356			mode = (mode << 3) | (*cp - '0');
1357		}
1358		if (!pflag)
1359			mode &= ~mask;
1360		if (*cp++ != ' ')
1361			SCREWUP("mode not delimited");
1362
1363		if (!isdigit((unsigned char)*cp))
1364			SCREWUP("size not present");
1365		ull = strtoull(cp, &cp, 10);
1366		if (!cp || *cp++ != ' ')
1367			SCREWUP("size not delimited");
1368		if (TYPE_OVERFLOW(off_t, ull))
1369			SCREWUP("size out of range");
1370		size = (off_t)ull;
1371
1372		if (*cp == '\0' || strchr(cp, '/') != NULL ||
1373		    strcmp(cp, ".") == 0 || strcmp(cp, "..") == 0) {
1374			run_err("error: unexpected filename: %s", cp);
1375			exit(1);
1376		}
1377		if (npatterns > 0) {
1378			for (n = 0; n < npatterns; n++) {
1379				if (fnmatch(patterns[n], cp, 0) == 0)
1380					break;
1381			}
1382			if (n >= npatterns)
1383				SCREWUP("filename does not match request");
1384		}
1385		if (targisdir) {
1386			static char *namebuf;
1387			static size_t cursize;
1388			size_t need;
1389
1390			need = strlen(targ) + strlen(cp) + 250;
1391			if (need > cursize) {
1392				free(namebuf);
1393				namebuf = xmalloc(need);
1394				cursize = need;
1395			}
1396			(void) snprintf(namebuf, need, "%s%s%s", targ,
1397			    strcmp(targ, "/") ? "/" : "", cp);
1398			np = namebuf;
1399		} else
1400			np = targ;
1401		curfile = cp;
1402		exists = stat(np, &stb) == 0;
1403		if (buf[0] == 'D') {
1404			int mod_flag = pflag;
1405			if (!iamrecursive)
1406				SCREWUP("received directory without -r");
1407			if (exists) {
1408				if (!S_ISDIR(stb.st_mode)) {
1409					errno = ENOTDIR;
1410					goto bad;
1411				}
1412				if (pflag)
1413					(void) chmod(np, mode);
1414			} else {
1415				/* Handle copying from a read-only
1416				   directory */
1417				mod_flag = 1;
1418				if (mkdir(np, mode | S_IRWXU) < 0)
1419					goto bad;
1420			}
1421			vect[0] = xstrdup(np);
1422			sink(1, vect, src);
1423			if (setimes) {
1424				setimes = 0;
1425				if (utimes(vect[0], tv) < 0)
1426					run_err("%s: set times: %s",
1427					    vect[0], strerror(errno));
1428			}
1429			if (mod_flag)
1430				(void) chmod(vect[0], mode);
1431			free(vect[0]);
1432			continue;
1433		}
1434		omode = mode;
1435		mode |= S_IWUSR;
1436		if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
1437bad:			run_err("%s: %s", np, strerror(errno));
1438			continue;
1439		}
1440		(void) atomicio(vwrite, remout, "", 1);
1441		if ((bp = allocbuf(&buffer, ofd, COPY_BUFLEN)) == NULL) {
1442			(void) close(ofd);
1443			continue;
1444		}
1445		cp = bp->buf;
1446		wrerr = NO;
1447
1448		statbytes = 0;
1449		if (showprogress)
1450			start_progress_meter(curfile, size, &statbytes);
1451		set_nonblock(remin);
1452		for (count = i = 0; i < size; i += bp->cnt) {
1453			amt = bp->cnt;
1454			if (i + amt > size)
1455				amt = size - i;
1456			count += amt;
1457			do {
1458				j = atomicio6(read, remin, cp, amt,
1459				    scpio, &statbytes);
1460				if (j == 0) {
1461					run_err("%s", j != EPIPE ?
1462					    strerror(errno) :
1463					    "dropped connection");
1464					exit(1);
1465				}
1466				amt -= j;
1467				cp += j;
1468			} while (amt > 0);
1469
1470			if (count == bp->cnt) {
1471				/* Keep reading so we stay sync'd up. */
1472				if (wrerr == NO) {
1473					if (atomicio(vwrite, ofd, bp->buf,
1474					    count) != count) {
1475						wrerr = YES;
1476						wrerrno = errno;
1477					}
1478				}
1479				count = 0;
1480				cp = bp->buf;
1481			}
1482		}
1483		unset_nonblock(remin);
1484		if (count != 0 && wrerr == NO &&
1485		    atomicio(vwrite, ofd, bp->buf, count) != count) {
1486			wrerr = YES;
1487			wrerrno = errno;
1488		}
1489		if (wrerr == NO && (!exists || S_ISREG(stb.st_mode)) &&
1490		    ftruncate(ofd, size) != 0) {
1491			run_err("%s: truncate: %s", np, strerror(errno));
1492			wrerr = DISPLAYED;
1493		}
1494		if (pflag) {
1495			if (exists || omode != mode)
1496#ifdef HAVE_FCHMOD
1497				if (fchmod(ofd, omode)) {
1498#else /* HAVE_FCHMOD */
1499				if (chmod(np, omode)) {
1500#endif /* HAVE_FCHMOD */
1501					run_err("%s: set mode: %s",
1502					    np, strerror(errno));
1503					wrerr = DISPLAYED;
1504				}
1505		} else {
1506			if (!exists && omode != mode)
1507#ifdef HAVE_FCHMOD
1508				if (fchmod(ofd, omode & ~mask)) {
1509#else /* HAVE_FCHMOD */
1510				if (chmod(np, omode & ~mask)) {
1511#endif /* HAVE_FCHMOD */
1512					run_err("%s: set mode: %s",
1513					    np, strerror(errno));
1514					wrerr = DISPLAYED;
1515				}
1516		}
1517		if (close(ofd) == -1) {
1518			wrerr = YES;
1519			wrerrno = errno;
1520		}
1521		(void) response();
1522		if (showprogress)
1523			stop_progress_meter();
1524		if (setimes && wrerr == NO) {
1525			setimes = 0;
1526			if (utimes(np, tv) < 0) {
1527				run_err("%s: set times: %s",
1528				    np, strerror(errno));
1529				wrerr = DISPLAYED;
1530			}
1531		}
1532		switch (wrerr) {
1533		case YES:
1534			run_err("%s: %s", np, strerror(wrerrno));
1535			break;
1536		case NO:
1537			(void) atomicio(vwrite, remout, "", 1);
1538			break;
1539		case DISPLAYED:
1540			break;
1541		}
1542	}
1543done:
1544	for (n = 0; n < npatterns; n++)
1545		free(patterns[n]);
1546	free(patterns);
1547	return;
1548screwup:
1549	for (n = 0; n < npatterns; n++)
1550		free(patterns[n]);
1551	free(patterns);
1552	run_err("protocol error: %s", why);
1553	exit(1);
1554}
1555
1556int
1557response(void)
1558{
1559	char ch, *cp, resp, rbuf[2048], visbuf[2048];
1560
1561	if (atomicio(read, remin, &resp, sizeof(resp)) != sizeof(resp))
1562		lostconn(0);
1563
1564	cp = rbuf;
1565	switch (resp) {
1566	case 0:		/* ok */
1567		return (0);
1568	default:
1569		*cp++ = resp;
1570		/* FALLTHROUGH */
1571	case 1:		/* error, followed by error msg */
1572	case 2:		/* fatal error, "" */
1573		do {
1574			if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
1575				lostconn(0);
1576			*cp++ = ch;
1577		} while (cp < &rbuf[sizeof(rbuf) - 1] && ch != '\n');
1578
1579		if (!iamremote) {
1580			cp[-1] = '\0';
1581			(void) snmprintf(visbuf, sizeof(visbuf),
1582			    NULL, "%s\n", rbuf);
1583			(void) atomicio(vwrite, STDERR_FILENO,
1584			    visbuf, strlen(visbuf));
1585		}
1586		++errs;
1587		if (resp == 1)
1588			return (-1);
1589		exit(1);
1590	}
1591	/* NOTREACHED */
1592}
1593
1594void
1595usage(void)
1596{
1597	(void) fprintf(stderr,
1598	    "usage: scp [-346BCpqrTv] [-c cipher] [-F ssh_config] [-i identity_file]\n"
1599	    "           [-l limit] [-o ssh_option] [-P port] [-S program] source ... target\n");
1600	exit(1);
1601}
1602
1603void
1604run_err(const char *fmt,...)
1605{
1606	static FILE *fp;
1607	va_list ap;
1608
1609	++errs;
1610	if (fp != NULL || (remout != -1 && (fp = fdopen(remout, "w")))) {
1611		(void) fprintf(fp, "%c", 0x01);
1612		(void) fprintf(fp, "scp: ");
1613		va_start(ap, fmt);
1614		(void) vfprintf(fp, fmt, ap);
1615		va_end(ap);
1616		(void) fprintf(fp, "\n");
1617		(void) fflush(fp);
1618	}
1619
1620	if (!iamremote) {
1621		va_start(ap, fmt);
1622		vfmprintf(stderr, fmt, ap);
1623		va_end(ap);
1624		fprintf(stderr, "\n");
1625	}
1626}
1627
1628void
1629verifydir(char *cp)
1630{
1631	struct stat stb;
1632
1633	if (!stat(cp, &stb)) {
1634		if (S_ISDIR(stb.st_mode))
1635			return;
1636		errno = ENOTDIR;
1637	}
1638	run_err("%s: %s", cp, strerror(errno));
1639	killchild(0);
1640}
1641
1642int
1643okname(char *cp0)
1644{
1645	int c;
1646	char *cp;
1647
1648	cp = cp0;
1649	do {
1650		c = (int)*cp;
1651		if (c & 0200)
1652			goto bad;
1653		if (!isalpha(c) && !isdigit((unsigned char)c)) {
1654			switch (c) {
1655			case '\'':
1656			case '"':
1657			case '`':
1658			case ' ':
1659			case '#':
1660				goto bad;
1661			default:
1662				break;
1663			}
1664		}
1665	} while (*++cp);
1666	return (1);
1667
1668bad:	fmprintf(stderr, "%s: invalid user name\n", cp0);
1669	return (0);
1670}
1671
1672BUF *
1673allocbuf(BUF *bp, int fd, int blksize)
1674{
1675	size_t size;
1676#ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
1677	struct stat stb;
1678
1679	if (fstat(fd, &stb) < 0) {
1680		run_err("fstat: %s", strerror(errno));
1681		return (0);
1682	}
1683	size = ROUNDUP(stb.st_blksize, blksize);
1684	if (size == 0)
1685		size = blksize;
1686#else /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1687	size = blksize;
1688#endif /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1689	if (bp->cnt >= size)
1690		return (bp);
1691	bp->buf = xrecallocarray(bp->buf, bp->cnt, size, 1);
1692	bp->cnt = size;
1693	return (bp);
1694}
1695
1696void
1697lostconn(int signo)
1698{
1699	if (!iamremote)
1700		(void)write(STDERR_FILENO, "lost connection\n", 16);
1701	if (signo)
1702		_exit(1);
1703	else
1704		exit(1);
1705}
1706