--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/scp.c	Tue Jun 01 02:46:09 2004 +0000
@@ -0,0 +1,1163 @@
+/*
+ * scp - secure remote copy.  This is basically patched BSD rcp which
+ * uses ssh to do the data transfer (instead of using rcmd).
+ *
+ * NOTE: This version should NOT be suid root.  (This uses ssh to
+ * do the transfer and ssh has the necessary privileges.)
+ *
+ * 1995 Timo Rinne <[email protected]>, Tatu Ylonen <[email protected]>
+ *
+ * As far as I am concerned, the code I have written for this software
+ * can be used freely for any purpose.  Any derived versions of this
+ * software must be clearly marked as such, and if the derived work is
+ * incompatible with the protocol description in the RFC file, it must be
+ * called by a name other than "ssh" or "Secure Shell".
+ */
+/*
+ * Copyright (c) 1999 Theo de Raadt.  All rights reserved.
+ * Copyright (c) 1999 Aaron Campbell.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * Parts from:
+ *
+ * Copyright (c) 1983, 1990, 1992, 1993, 1995
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ */
+
+#include "includes.h"
+#include "atomicio.h"
+#include "compat.h"
+#include "scpmisc.h"
+#include "progressmeter.h"
+
+#define _PATH_CP "/bin/cp"
+
+#ifndef TIMEVAL_TO_TIMESPEC
+#define	TIMEVAL_TO_TIMESPEC(tv, ts) {					\
+	(ts)->tv_sec = (tv)->tv_sec;					\
+	(ts)->tv_nsec = (tv)->tv_usec * 1000;				\
+}
+#endif
+
+#ifndef timersub
+#define timersub(tvp, uvp, vvp)					 \
+	do {								\
+		(vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec;	  \
+		(vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec;   \
+		if ((vvp)->tv_usec < 0) {			   \
+			(vvp)->tv_sec--;				\
+			(vvp)->tv_usec += 1000000;		  \
+		}						   \
+	} while (/* CONSTCOND */ 0)
+#endif /* timersub */
+
+
+void bwlimit(int);
+
+/* Struct for addargs */
+arglist args;
+
+/* Bandwidth limit */
+off_t limitbw = 0;
+
+/* Name of current file being transferred. */
+char *curfile;
+
+/* This is set to non-zero to enable verbose mode. */
+int verbose_mode = 0;
+
+#ifdef PROGRESS_METER
+/* This is set to zero if the progressmeter is not desired. */
+int showprogress = 1;
+#endif
+
+/* This is the program to execute for the secured connection. ("ssh" or -S) */
+char *ssh_program = _PATH_SSH_PROGRAM;
+
+/* This is used to store the pid of ssh_program */
+pid_t do_cmd_pid = -1;
+
+static void
+killchild(int signo)
+{
+	if (do_cmd_pid > 1)
+		kill(do_cmd_pid, signo);
+
+	_exit(1);
+}
+
+/*
+ * This function executes the given command as the specified user on the
+ * given host.  This returns < 0 if execution fails, and >= 0 otherwise. This
+ * assigns the input and output file descriptors on success.
+ */
+
+int
+do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout, int argc)
+{
+	int pin[2], pout[2], reserved[2];
+
+	if (verbose_mode)
+		fprintf(stderr,
+		    "Executing: program %s host %s, user %s, command %s\n",
+		    ssh_program, host,
+		    remuser ? remuser : "(unspecified)", cmd);
+
+	/*
+	 * Reserve two descriptors so that the real pipes won't get
+	 * descriptors 0 and 1 because that will screw up dup2 below.
+	 */
+	pipe(reserved);
+
+	/* Create a socket pair for communicating with ssh. */
+	if (pipe(pin) < 0 || pipe(pout) < 0)
+	{
+		fprintf(stderr, "Fatal error: pipe: %s\n", strerror(errno));
+		exit(1);
+	}
+
+	/* Free the reserved descriptors. */
+	close(reserved[0]);
+	close(reserved[1]);
+
+	/* Fork a child to execute the command on the remote host using ssh. */
+	do_cmd_pid = fork();
+	if (do_cmd_pid == 0) {
+		/* Child. */
+		close(pin[1]);
+		close(pout[0]);
+		dup2(pin[0], 0);
+		dup2(pout[1], 1);
+		close(pin[0]);
+		close(pout[1]);
+
+		args.list[0] = ssh_program;
+		if (remuser != NULL)
+			addargs(&args, "-l%s", remuser);
+		addargs(&args, "%s", host);
+		addargs(&args, "%s", cmd);
+
+		execvp(ssh_program, args.list);
+		perror(ssh_program);
+		exit(1);
+	} else if (do_cmd_pid == -1) {
+		fprintf(stderr, "Fatal error: fork: %s\n", strerror(errno));
+		exit(1);
+	}
+	/* Parent.  Close the other side, and return the local side. */
+	close(pin[0]);
+	*fdout = pin[1];
+	close(pout[1]);
+	*fdin = pout[0];
+	signal(SIGTERM, killchild);
+	signal(SIGINT, killchild);
+	signal(SIGHUP, killchild);
+	return 0;
+}
+
+typedef struct {
+	int cnt;
+	char *buf;
+} BUF;
+
+BUF *allocbuf(BUF *, int, int);
+void lostconn(int);
+void nospace(void);
+int okname(char *);
+void run_err(const char *,...);
+void verifydir(char *);
+
+struct passwd *pwd;
+uid_t userid;
+int errs, remin, remout;
+int pflag, iamremote, iamrecursive, targetshouldbedirectory;
+
+#define	CMDNEEDS	64
+char cmd[CMDNEEDS];		/* must hold "rcp -r -p -d\0" */
+
+int response(void);
+void rsource(char *, struct stat *);
+void sink(int, char *[]);
+void source(int, char *[]);
+void tolocal(int, char *[]);
+void toremote(char *, int, char *[]);
+void usage(void);
+
+int
+main(int argc, char **argv)
+{
+	int ch, fflag, tflag, status;
+	double speed;
+	char *targ, *endp;
+	extern char *optarg;
+	extern int optind;
+
+	/* hack, seems to work */
+//	__progname = argv[0];
+
+	args.list = NULL;
+	addargs(&args, "ssh");		/* overwritten with ssh_program */
+	addargs(&args, "-x");
+	addargs(&args, "-oForwardAgent no");
+	addargs(&args, "-oClearAllForwardings yes");
+
+	fflag = tflag = 0;
+	while ((ch = getopt(argc, argv, "dfl:prtvBCc:i:P:q1246S:o:F:")) != -1)
+		switch (ch) {
+		/* User-visible flags. */
+		case '1':
+		case '2':
+		case '4':
+		case '6':
+		case 'C':
+			addargs(&args, "-%c", ch);
+			break;
+		case 'o':
+		case 'c':
+		case 'i':
+		case 'F':
+			addargs(&args, "-%c%s", ch, optarg);
+			break;
+		case 'P':
+			addargs(&args, "-p%s", optarg);
+			break;
+		case 'B':
+			addargs(&args, "-oBatchmode yes");
+			break;
+		case 'l':
+			speed = strtod(optarg, &endp);
+			if (speed <= 0 || *endp != '\0')
+				usage();
+			limitbw = speed * 1024;
+			break;
+		case 'p':
+			pflag = 1;
+			break;
+		case 'r':
+			iamrecursive = 1;
+			break;
+		case 'S':
+			ssh_program = xstrdup(optarg);
+			break;
+		case 'v':
+			addargs(&args, "-v");
+			verbose_mode = 1;
+			break;
+#ifdef PROGRESS_METER
+		case 'q':
+			showprogress = 0;
+			break;
+#endif
+
+		/* Server options. */
+		case 'd':
+			targetshouldbedirectory = 1;
+			break;
+		case 'f':	/* "from" */
+			iamremote = 1;
+			fflag = 1;
+			break;
+		case 't':	/* "to" */
+			iamremote = 1;
+			tflag = 1;
+#ifdef HAVE_CYGWIN
+			setmode(0, O_BINARY);
+#endif
+			break;
+		default:
+			usage();
+		}
+	argc -= optind;
+	argv += optind;
+
+	if ((pwd = getpwuid(userid = getuid())) == NULL) {
+		fprintf(stderr, "unknown user %u", (u_int) userid);
+	}
+
+#ifdef PROGRESS_METER
+	if (!isatty(STDERR_FILENO))
+		showprogress = 0;
+#endif
+
+	remin = STDIN_FILENO;
+	remout = STDOUT_FILENO;
+
+	if (fflag) {
+		/* Follow "protocol", send data. */
+		(void) response();
+		source(argc, argv);
+		exit(errs != 0);
+	}
+	if (tflag) {
+		/* Receive data. */
+		sink(argc, argv);
+		exit(errs != 0);
+	}
+	if (argc < 2)
+		usage();
+	if (argc > 2)
+		targetshouldbedirectory = 1;
+
+	remin = remout = -1;
+	do_cmd_pid = -1;
+	/* Command to be executed on remote system using "ssh". */
+	(void) snprintf(cmd, sizeof cmd, "scp%s%s%s%s",
+	    verbose_mode ? " -v" : "",
+	    iamrecursive ? " -r" : "", pflag ? " -p" : "",
+	    targetshouldbedirectory ? " -d" : "");
+
+	(void) signal(SIGPIPE, lostconn);
+
+	if ((targ = colon(argv[argc - 1])))	/* Dest is remote host. */
+		toremote(targ, argc, argv);
+	else {
+		tolocal(argc, argv);	/* Dest is local host. */
+		if (targetshouldbedirectory)
+			verifydir(argv[argc - 1]);
+	}
+	/*
+	 * Finally check the exit status of the ssh process, if one was forked
+	 * and no error has occured yet
+	 */
+	if (do_cmd_pid != -1 && errs == 0) {
+		if (remin != -1)
+		    (void) close(remin);
+		if (remout != -1)
+		    (void) close(remout);
+		if (waitpid(do_cmd_pid, &status, 0) == -1)
+			errs = 1;
+		else {
+			if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
+				errs = 1;
+		}
+	}
+	exit(errs != 0);
+}
+
+void
+toremote(char *targ, int argc, char **argv)
+{
+	int i, len;
+	char *bp, *host, *src, *suser, *thost, *tuser;
+
+	*targ++ = 0;
+	if (*targ == 0)
+		targ = ".";
+
+	if ((thost = strrchr(argv[argc - 1], '@'))) {
+		/* user@host */
+		*thost++ = 0;
+		tuser = argv[argc - 1];
+		if (*tuser == '\0')
+			tuser = NULL;
+	} else {
+		thost = argv[argc - 1];
+		tuser = NULL;
+	}
+
+	for (i = 0; i < argc - 1; i++) {
+		src = colon(argv[i]);
+		if (src) {	/* remote to remote */
+			static char *ssh_options =
+			    "-x -o'ClearAllForwardings yes'";
+			*src++ = 0;
+			if (*src == 0)
+				src = ".";
+			host = strrchr(argv[i], '@');
+			len = strlen(ssh_program) + strlen(argv[i]) +
+			    strlen(src) + (tuser ? strlen(tuser) : 0) +
+			    strlen(thost) + strlen(targ) +
+			    strlen(ssh_options) + CMDNEEDS + 20;
+			bp = xmalloc(len);
+			if (host) {
+				*host++ = 0;
+				host = cleanhostname(host);
+				suser = argv[i];
+				if (*suser == '\0')
+					suser = pwd->pw_name;
+				else if (!okname(suser)) {
+					xfree(bp);
+					continue;
+				}
+				if (tuser && !okname(tuser)) {
+					xfree(bp);
+					continue;
+				}
+				snprintf(bp, len,
+				    "%s%s %s -n "
+				    "-l %s %s %s %s '%s%s%s:%s'",
+				    ssh_program, verbose_mode ? " -v" : "",
+				    ssh_options, suser, host, cmd, src,
+				    tuser ? tuser : "", tuser ? "@" : "",
+				    thost, targ);
+			} else {
+				host = cleanhostname(argv[i]);
+				snprintf(bp, len,
+				    "exec %s%s %s -n %s "
+				    "%s %s '%s%s%s:%s'",
+				    ssh_program, verbose_mode ? " -v" : "",
+				    ssh_options, host, cmd, src,
+				    tuser ? tuser : "", tuser ? "@" : "",
+				    thost, targ);
+			}
+			if (verbose_mode)
+				fprintf(stderr, "Executing: %s\n", bp);
+			(void) system(bp);
+			(void) xfree(bp);
+		} else {	/* local to remote */
+			if (remin == -1) {
+				len = strlen(targ) + CMDNEEDS + 20;
+				bp = xmalloc(len);
+				(void) snprintf(bp, len, "%s -t %s", cmd, targ);
+				host = cleanhostname(thost);
+				if (do_cmd(host, tuser, bp, &remin,
+				    &remout, argc) < 0)
+					exit(1);
+				if (response() < 0)
+					exit(1);
+				(void) xfree(bp);
+			}
+			source(1, argv + i);
+		}
+	}
+}
+
+void
+tolocal(int argc, char **argv)
+{
+	int i, len;
+	char *bp, *host, *src, *suser;
+
+	for (i = 0; i < argc - 1; i++) {
+		if (!(src = colon(argv[i]))) {	/* Local to local. */
+			len = strlen(_PATH_CP) + strlen(argv[i]) +
+			    strlen(argv[argc - 1]) + 20;
+			bp = xmalloc(len);
+			(void) snprintf(bp, len, "exec %s%s%s %s %s", _PATH_CP,
+			    iamrecursive ? " -r" : "", pflag ? " -p" : "",
+			    argv[i], argv[argc - 1]);
+			if (verbose_mode)
+				fprintf(stderr, "Executing: %s\n", bp);
+			if (system(bp))
+				++errs;
+			(void) xfree(bp);
+			continue;
+		}
+		*src++ = 0;
+		if (*src == 0)
+			src = ".";
+		if ((host = strrchr(argv[i], '@')) == NULL) {
+			host = argv[i];
+			suser = NULL;
+		} else {
+			*host++ = 0;
+			suser = argv[i];
+			if (*suser == '\0')
+				suser = pwd->pw_name;
+		}
+		host = cleanhostname(host);
+		len = strlen(src) + CMDNEEDS + 20;
+		bp = xmalloc(len);
+		(void) snprintf(bp, len, "%s -f %s", cmd, src);
+		if (do_cmd(host, suser, bp, &remin, &remout, argc) < 0) {
+			(void) xfree(bp);
+			++errs;
+			continue;
+		}
+		xfree(bp);
+		sink(1, argv + argc - 1);
+		(void) close(remin);
+		remin = remout = -1;
+	}
+}
+
+void
+source(int argc, char **argv)
+{
+	struct stat stb;
+	static BUF buffer;
+	BUF *bp;
+	off_t i, amt, result, statbytes;
+	int fd, haderr, indx;
+	char *last, *name, buf[2048];
+	int len;
+
+	for (indx = 0; indx < argc; ++indx) {
+		name = argv[indx];
+		statbytes = 0;
+		len = strlen(name);
+		while (len > 1 && name[len-1] == '/')
+			name[--len] = '\0';
+		if (strchr(name, '\n') != NULL) {
+			run_err("%s: skipping, filename contains a newline",
+			    name);
+			goto next;
+		}
+		if ((fd = open(name, O_RDONLY, 0)) < 0)
+			goto syserr;
+		if (fstat(fd, &stb) < 0) {
+syserr:			run_err("%s: %s", name, strerror(errno));
+			goto next;
+		}
+		switch (stb.st_mode & S_IFMT) {
+		case S_IFREG:
+			break;
+		case S_IFDIR:
+			if (iamrecursive) {
+				rsource(name, &stb);
+				goto next;
+			}
+			/* FALLTHROUGH */
+		default:
+			run_err("%s: not a regular file", name);
+			goto next;
+		}
+		if ((last = strrchr(name, '/')) == NULL)
+			last = name;
+		else
+			++last;
+		curfile = last;
+		if (pflag) {
+			/*
+			 * Make it compatible with possible future
+			 * versions expecting microseconds.
+			 */
+			(void) snprintf(buf, sizeof buf, "T%lu 0 %lu 0\n",
+			    (u_long) stb.st_mtime,
+			    (u_long) stb.st_atime);
+			(void) atomicio(vwrite, remout, buf, strlen(buf));
+			if (response() < 0)
+				goto next;
+		}
+#define	FILEMODEMASK	(S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO)
+		snprintf(buf, sizeof buf, "C%04o %lld %s\n",
+		    (u_int) (stb.st_mode & FILEMODEMASK),
+		    (int64_t)stb.st_size, last);
+		if (verbose_mode) {
+			fprintf(stderr, "Sending file modes: %s", buf);
+		}
+		(void) atomicio(vwrite, remout, buf, strlen(buf));
+		if (response() < 0)
+			goto next;
+		if ((bp = allocbuf(&buffer, fd, 2048)) == NULL) {
+next:			(void) close(fd);
+			continue;
+		}
+#ifdef PROGRESS_METER
+		if (showprogress)
+			start_progress_meter(curfile, stb.st_size, &statbytes);
+#endif
+		/* Keep writing after an error so that we stay sync'd up. */
+		for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
+			amt = bp->cnt;
+			if (i + amt > stb.st_size)
+				amt = stb.st_size - i;
+			if (!haderr) {
+				result = atomicio(read, fd, bp->buf, amt);
+				if (result != amt)
+					haderr = result >= 0 ? EIO : errno;
+			}
+			if (haderr)
+				(void) atomicio(vwrite, remout, bp->buf, amt);
+			else {
+				result = atomicio(vwrite, remout, bp->buf, amt);
+				if (result != amt)
+					haderr = result >= 0 ? EIO : errno;
+				statbytes += result;
+			}
+			if (limitbw)
+				bwlimit(amt);
+		}
+#ifdef PROGRESS_METER
+		if (showprogress)
+			stop_progress_meter();
+#endif
+
+		if (close(fd) < 0 && !haderr)
+			haderr = errno;
+		if (!haderr)
+			(void) atomicio(vwrite, remout, "", 1);
+		else
+			run_err("%s: %s", name, strerror(haderr));
+		(void) response();
+	}
+}
+
+void
+rsource(char *name, struct stat *statp)
+{
+	DIR *dirp;
+	struct dirent *dp;
+	char *last, *vect[1], path[1100];
+
+	if (!(dirp = opendir(name))) {
+		run_err("%s: %s", name, strerror(errno));
+		return;
+	}
+	last = strrchr(name, '/');
+	if (last == 0)
+		last = name;
+	else
+		last++;
+	if (pflag) {
+		(void) snprintf(path, sizeof(path), "T%lu 0 %lu 0\n",
+		    (u_long) statp->st_mtime,
+		    (u_long) statp->st_atime);
+		(void) atomicio(vwrite, remout, path, strlen(path));
+		if (response() < 0) {
+			closedir(dirp);
+			return;
+		}
+	}
+	(void) snprintf(path, sizeof path, "D%04o %d %.1024s\n",
+	    (u_int) (statp->st_mode & FILEMODEMASK), 0, last);
+	if (verbose_mode)
+		fprintf(stderr, "Entering directory: %s", path);
+	(void) atomicio(vwrite, remout, path, strlen(path));
+	if (response() < 0) {
+		closedir(dirp);
+		return;
+	}
+	while ((dp = readdir(dirp)) != NULL) {
+		if (dp->d_ino == 0)
+			continue;
+		if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
+			continue;
+		if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path) - 1) {
+			run_err("%s/%s: name too long", name, dp->d_name);
+			continue;
+		}
+		(void) snprintf(path, sizeof path, "%s/%s", name, dp->d_name);
+		vect[0] = path;
+		source(1, vect);
+	}
+	(void) closedir(dirp);
+	(void) atomicio(vwrite, remout, "E\n", 2);
+	(void) response();
+}
+
+void
+bwlimit(int amount)
+{
+	static struct timeval bwstart, bwend;
+	static int lamt, thresh = 16384;
+	uint64_t wait;
+	struct timespec ts, rm;
+
+	if (!timerisset(&bwstart)) {
+		gettimeofday(&bwstart, NULL);
+		return;
+	}
+
+	lamt += amount;
+	if (lamt < thresh)
+		return;
+
+	gettimeofday(&bwend, NULL);
+	timersub(&bwend, &bwstart, &bwend);
+	if (!timerisset(&bwend))
+		return;
+
+	lamt *= 8;
+	wait = (double)1000000L * lamt / limitbw;
+
+	bwstart.tv_sec = wait / 1000000L;
+	bwstart.tv_usec = wait % 1000000L;
+
+	if (timercmp(&bwstart, &bwend, >)) {
+		timersub(&bwstart, &bwend, &bwend);
+
+		/* Adjust the wait time */
+		if (bwend.tv_sec) {
+			thresh /= 2;
+			if (thresh < 2048)
+				thresh = 2048;
+		} else if (bwend.tv_usec < 100) {
+			thresh *= 2;
+			if (thresh > 32768)
+				thresh = 32768;
+		}
+
+		TIMEVAL_TO_TIMESPEC(&bwend, &ts);
+		while (nanosleep(&ts, &rm) == -1) {
+			if (errno != EINTR)
+				break;
+			ts = rm;
+		}
+	}
+
+	lamt = 0;
+	gettimeofday(&bwstart, NULL);
+}
+
+void
+sink(int argc, char **argv)
+{
+	static BUF buffer;
+	struct stat stb;
+	enum {
+		YES, NO, DISPLAYED
+	} wrerr;
+	BUF *bp;
+	off_t i, j;
+	int amt, count, exists, first, mask, mode, ofd, omode;
+	off_t size, statbytes;
+	int setimes, targisdir, wrerrno = 0;
+	char ch, *cp, *np, *targ, *why, *vect[1], buf[2048];
+	struct timeval tv[2];
+
+#define	atime	tv[0]
+#define	mtime	tv[1]
+#define	SCREWUP(str)	do { why = str; goto screwup; } while (0)
+
+	setimes = targisdir = 0;
+	mask = umask(0);
+	if (!pflag)
+		(void) umask(mask);
+	if (argc != 1) {
+		run_err("ambiguous target");
+		exit(1);
+	}
+	targ = *argv;
+	if (targetshouldbedirectory)
+		verifydir(targ);
+
+	(void) atomicio(vwrite, remout, "", 1);
+	if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
+		targisdir = 1;
+	for (first = 1;; first = 0) {
+		cp = buf;
+		if (atomicio(read, remin, cp, 1) <= 0)
+			return;
+		if (*cp++ == '\n')
+			SCREWUP("unexpected <newline>");
+		do {
+			if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
+				SCREWUP("lost connection");
+			*cp++ = ch;
+		} while (cp < &buf[sizeof(buf) - 1] && ch != '\n');
+		*cp = 0;
+
+		if (buf[0] == '\01' || buf[0] == '\02') {
+			if (iamremote == 0)
+				(void) atomicio(vwrite, STDERR_FILENO,
+				    buf + 1, strlen(buf + 1));
+			if (buf[0] == '\02')
+				exit(1);
+			++errs;
+			continue;
+		}
+		if (buf[0] == 'E') {
+			(void) atomicio(vwrite, remout, "", 1);
+			return;
+		}
+		if (ch == '\n')
+			*--cp = 0;
+
+		cp = buf;
+		if (*cp == 'T') {
+			setimes++;
+			cp++;
+			mtime.tv_sec = strtol(cp, &cp, 10);
+			if (!cp || *cp++ != ' ')
+				SCREWUP("mtime.sec not delimited");
+			mtime.tv_usec = strtol(cp, &cp, 10);
+			if (!cp || *cp++ != ' ')
+				SCREWUP("mtime.usec not delimited");
+			atime.tv_sec = strtol(cp, &cp, 10);
+			if (!cp || *cp++ != ' ')
+				SCREWUP("atime.sec not delimited");
+			atime.tv_usec = strtol(cp, &cp, 10);
+			if (!cp || *cp++ != '\0')
+				SCREWUP("atime.usec not delimited");
+			(void) atomicio(vwrite, remout, "", 1);
+			continue;
+		}
+		if (*cp != 'C' && *cp != 'D') {
+			/*
+			 * Check for the case "rcp remote:foo\* local:bar".
+			 * In this case, the line "No match." can be returned
+			 * by the shell before the rcp command on the remote is
+			 * executed so the ^Aerror_message convention isn't
+			 * followed.
+			 */
+			if (first) {
+				run_err("%s", cp);
+				exit(1);
+			}
+			SCREWUP("expected control record");
+		}
+		mode = 0;
+		for (++cp; cp < buf + 5; cp++) {
+			if (*cp < '0' || *cp > '7')
+				SCREWUP("bad mode");
+			mode = (mode << 3) | (*cp - '0');
+		}
+		if (*cp++ != ' ')
+			SCREWUP("mode not delimited");
+
+		for (size = 0; isdigit(*cp);)
+			size = size * 10 + (*cp++ - '0');
+		if (*cp++ != ' ')
+			SCREWUP("size not delimited");
+		if (targisdir) {
+			static char *namebuf;
+			static int cursize;
+			size_t need;
+
+			need = strlen(targ) + strlen(cp) + 250;
+			if (need > cursize) {
+				if (namebuf)
+					xfree(namebuf);
+				namebuf = xmalloc(need);
+				cursize = need;
+			}
+			(void) snprintf(namebuf, need, "%s%s%s", targ,
+			    strcmp(targ, "/") ? "/" : "", cp);
+			np = namebuf;
+		} else
+			np = targ;
+		curfile = cp;
+		exists = stat(np, &stb) == 0;
+		if (buf[0] == 'D') {
+			int mod_flag = pflag;
+			if (exists) {
+				if (!S_ISDIR(stb.st_mode)) {
+					errno = ENOTDIR;
+					goto bad;
+				}
+				if (pflag)
+					(void) chmod(np, mode);
+			} else {
+				/* Handle copying from a read-only
+				   directory */
+				mod_flag = 1;
+				if (mkdir(np, mode | S_IRWXU) < 0)
+					goto bad;
+			}
+			vect[0] = xstrdup(np);
+			sink(1, vect);
+			if (setimes) {
+				setimes = 0;
+				if (utimes(vect[0], tv) < 0)
+					run_err("%s: set times: %s",
+					    vect[0], strerror(errno));
+			}
+			if (mod_flag)
+				(void) chmod(vect[0], mode);
+			if (vect[0])
+				xfree(vect[0]);
+			continue;
+		}
+		omode = mode;
+		mode |= S_IWRITE;
+		if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
+bad:			run_err("%s: %s", np, strerror(errno));
+			continue;
+		}
+		(void) atomicio(vwrite, remout, "", 1);
+		if ((bp = allocbuf(&buffer, ofd, 4096)) == NULL) {
+			(void) close(ofd);
+			continue;
+		}
+		cp = bp->buf;
+		wrerr = NO;
+
+		statbytes = 0;
+#ifdef PROGRESS_METER
+		if (showprogress)
+			start_progress_meter(curfile, size, &statbytes);
+#endif
+		for (count = i = 0; i < size; i += 4096) {
+			amt = 4096;
+			if (i + amt > size)
+				amt = size - i;
+			count += amt;
+			do {
+				j = read(remin, cp, amt);
+				if (j == -1 && (errno == EINTR ||
+				    errno == EAGAIN)) {
+					continue;
+				} else if (j <= 0) {
+					run_err("%s", j ? strerror(errno) :
+					    "dropped connection");
+					exit(1);
+				}
+				amt -= j;
+				cp += j;
+				statbytes += j;
+			} while (amt > 0);
+		
+			if (limitbw)
+				bwlimit(4096);
+
+			if (count == bp->cnt) {
+				/* Keep reading so we stay sync'd up. */
+				if (wrerr == NO) {
+					j = atomicio(vwrite, ofd, bp->buf, count);
+					if (j != count) {
+						wrerr = YES;
+						wrerrno = j >= 0 ? EIO : errno;
+					}
+				}
+				count = 0;
+				cp = bp->buf;
+			}
+		}
+#ifdef PROGRESS_METER
+		if (showprogress)
+			stop_progress_meter();
+#endif
+		if (count != 0 && wrerr == NO &&
+		    (j = atomicio(vwrite, ofd, bp->buf, count)) != count) {
+			wrerr = YES;
+			wrerrno = j >= 0 ? EIO : errno;
+		}
+		if (wrerr == NO && ftruncate(ofd, size) != 0) {
+			run_err("%s: truncate: %s", np, strerror(errno));
+			wrerr = DISPLAYED;
+		}
+		if (pflag) {
+			if (exists || omode != mode)
+#ifdef HAVE_FCHMOD
+				if (fchmod(ofd, omode))
+#else /* HAVE_FCHMOD */
+				if (chmod(np, omode))
+#endif /* HAVE_FCHMOD */
+					run_err("%s: set mode: %s",
+					    np, strerror(errno));
+		} else {
+			if (!exists && omode != mode)
+#ifdef HAVE_FCHMOD
+				if (fchmod(ofd, omode & ~mask))
+#else /* HAVE_FCHMOD */
+				if (chmod(np, omode & ~mask))
+#endif /* HAVE_FCHMOD */
+					run_err("%s: set mode: %s",
+					    np, strerror(errno));
+		}
+		if (close(ofd) == -1) {
+			wrerr = YES;
+			wrerrno = errno;
+		}
+		(void) response();
+		if (setimes && wrerr == NO) {
+			setimes = 0;
+			if (utimes(np, tv) < 0) {
+				run_err("%s: set times: %s",
+				    np, strerror(errno));
+				wrerr = DISPLAYED;
+			}
+		}
+		switch (wrerr) {
+		case YES:
+			run_err("%s: %s", np, strerror(wrerrno));
+			break;
+		case NO:
+			(void) atomicio(vwrite, remout, "", 1);
+			break;
+		case DISPLAYED:
+			break;
+		}
+	}
+screwup:
+	run_err("protocol error: %s", why);
+	exit(1);
+}
+
+int
+response(void)
+{
+	char ch, *cp, resp, rbuf[2048];
+
+	if (atomicio(read, remin, &resp, sizeof(resp)) != sizeof(resp))
+		lostconn(0);
+
+	cp = rbuf;
+	switch (resp) {
+	case 0:		/* ok */
+		return (0);
+	default:
+		*cp++ = resp;
+		/* FALLTHROUGH */
+	case 1:		/* error, followed by error msg */
+	case 2:		/* fatal error, "" */
+		do {
+			if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
+				lostconn(0);
+			*cp++ = ch;
+		} while (cp < &rbuf[sizeof(rbuf) - 1] && ch != '\n');
+
+		if (!iamremote)
+			(void) atomicio(vwrite, STDERR_FILENO, rbuf, cp - rbuf);
+		++errs;
+		if (resp == 1)
+			return (-1);
+		exit(1);
+	}
+	/* NOTREACHED */
+}
+
+void
+usage(void)
+{
+	(void) fprintf(stderr,
+	    "usage: scp [-pqrvBC1246] [-F config] [-S program] [-P port]\n"
+	    "           [-c cipher] [-i identity] [-l limit] [-o option]\n"
+	    "           [[user@]host1:]file1 [...] [[user@]host2:]file2\n");
+	exit(1);
+}
+
+void
+run_err(const char *fmt,...)
+{
+	static FILE *fp;
+	va_list ap;
+
+	++errs;
+	if (fp == NULL && !(fp = fdopen(remout, "w")))
+		return;
+	(void) fprintf(fp, "%c", 0x01);
+	(void) fprintf(fp, "scp: ");
+	va_start(ap, fmt);
+	(void) vfprintf(fp, fmt, ap);
+	va_end(ap);
+	(void) fprintf(fp, "\n");
+	(void) fflush(fp);
+
+	if (!iamremote) {
+		va_start(ap, fmt);
+		vfprintf(stderr, fmt, ap);
+		va_end(ap);
+		fprintf(stderr, "\n");
+	}
+}
+
+void
+verifydir(char *cp)
+{
+	struct stat stb;
+
+	if (!stat(cp, &stb)) {
+		if (S_ISDIR(stb.st_mode))
+			return;
+		errno = ENOTDIR;
+	}
+	run_err("%s: %s", cp, strerror(errno));
+	exit(1);
+}
+
+int
+okname(char *cp0)
+{
+	int c;
+	char *cp;
+
+	cp = cp0;
+	do {
+		c = (int)*cp;
+		if (c & 0200)
+			goto bad;
+		if (!isalpha(c) && !isdigit(c)) {
+			switch (c) {
+			case '\'':
+			case '"':
+			case '`':
+			case ' ':
+			case '#':
+				goto bad;
+			default:
+				break;
+			}
+		}
+	} while (*++cp);
+	return (1);
+
+bad:	fprintf(stderr, "%s: invalid user name\n", cp0);
+	return (0);
+}
+
+BUF *
+allocbuf(BUF *bp, int fd, int blksize)
+{
+	size_t size;
+#ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
+	struct stat stb;
+
+	if (fstat(fd, &stb) < 0) {
+		run_err("fstat: %s", strerror(errno));
+		return (0);
+	}
+	size = roundup(stb.st_blksize, blksize);
+	if (size == 0)
+		size = blksize;
+#else /* HAVE_STRUCT_STAT_ST_BLKSIZE */
+	size = blksize;
+#endif /* HAVE_STRUCT_STAT_ST_BLKSIZE */
+	if (bp->cnt >= size)
+		return (bp);
+	if (bp->buf == NULL)
+		bp->buf = xmalloc(size);
+	else
+		bp->buf = xrealloc(bp->buf, size);
+	memset(bp->buf, 0, size);
+	bp->cnt = size;
+	return (bp);
+}
+
+void
+lostconn(int signo)
+{
+	if (!iamremote)
+		write(STDERR_FILENO, "lost connection\n", 16);
+	if (signo)
+		_exit(1);
+	else
+		exit(1);
+}