xref: /titanic_50/usr/src/cmd/ssh/sftp/sftp.c (revision cf58b2543a341d4f5a661de47968a7016c3207ff)

/*
 * Copyright (c) 2001-2004 Damien Miller <djm@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

/* $OpenBSD: sftp.c,v 1.96 2007/01/03 04:09:15 stevesk Exp $ */

#include "includes.h"

#include <sys/types.h>
#include <sys/ioctl.h>
#ifdef HAVE_SYS_STAT_H
# include <sys/stat.h>
#endif
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/wait.h>

#include <errno.h>

#ifdef HAVE_PATHS_H
# include <paths.h>
#endif

#ifdef USE_LIBEDIT
#include <histedit.h>
#else
#ifdef USE_LIBTECLA
#include <libtecla.h>
#define	MAX_LINE_LEN	2048
#define	MAX_CMD_HIST	10000
#endif /* USE_LIBTECLA */
#endif /* USE_LIBEDIT */

#include <signal.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdarg.h>

#include "xmalloc.h"
#include "log.h"
#include "pathnames.h"
#include "misc.h"

#include "sftp.h"
#include "buffer.h"
#include "sftp-common.h"
#include "sftp-client.h"

#ifdef HAVE___PROGNAME
extern char *__progname;
#else
char *__progname;
#endif


/* File to read commands from */
FILE* infile;

/* Are we in batchfile mode? */
int batchmode = 0;

/* Size of buffer used when copying files */
size_t copy_buffer_len = 32768;

/* Number of concurrent outstanding requests */
size_t num_requests = 16;

/* PID of ssh transport process */
static pid_t sshpid = -1;

/* This is set to 0 if the progressmeter is not desired. */
int showprogress = 1;

/* SIGINT received during command processing */
volatile sig_atomic_t interrupted = 0;

/* I wish qsort() took a separate ctx for the comparison function...*/
int sort_flag;

int remote_glob(struct sftp_conn *, const char *, int,
    int (*)(const char *, int), glob_t *); /* proto for sftp-glob.c */

/* Separators for interactive commands */
#define WHITESPACE " \t\r\n"

/* ls flags */
#define LS_LONG_VIEW	0x01	/* Full view ala ls -l */
#define LS_SHORT_VIEW	0x02	/* Single row view ala ls -1 */
#define LS_NUMERIC_VIEW	0x04	/* Long view with numeric uid/gid */
#define LS_NAME_SORT	0x08	/* Sort by name (default) */
#define LS_TIME_SORT	0x10	/* Sort by mtime */
#define LS_SIZE_SORT	0x20	/* Sort by file size */
#define LS_REVERSE_SORT	0x40	/* Reverse sort order */
#define LS_SHOW_ALL	0x80	/* Don't skip filenames starting with '.' */

#define VIEW_FLAGS	(LS_LONG_VIEW|LS_SHORT_VIEW|LS_NUMERIC_VIEW)
#define SORT_FLAGS	(LS_NAME_SORT|LS_TIME_SORT|LS_SIZE_SORT)

/* Commands for interactive mode */
#define I_CHDIR		1
#define I_CHGRP		2
#define I_CHMOD		3
#define I_CHOWN		4
#define I_GET		5
#define I_HELP		6
#define I_LCHDIR	7
#define I_LLS		8
#define I_LMKDIR	9
#define I_LPWD		10
#define I_LS		11
#define I_LUMASK	12
#define I_MKDIR		13
#define I_PUT		14
#define I_PWD		15
#define I_QUIT		16
#define I_RENAME	17
#define I_RM		18
#define I_RMDIR		19
#define I_SHELL		20
#define I_SYMLINK	21
#define I_VERSION	22
#define I_PROGRESS	23

struct CMD {
	const char *c;
	const int n;
};

static const struct CMD cmds[] = {
	{ "bye",	I_QUIT },
	{ "cd",		I_CHDIR },
	{ "chdir",	I_CHDIR },
	{ "chgrp",	I_CHGRP },
	{ "chmod",	I_CHMOD },
	{ "chown",	I_CHOWN },
	{ "dir",	I_LS },
	{ "exit",	I_QUIT },
	{ "get",	I_GET },
	{ "mget",	I_GET },
	{ "help",	I_HELP },
	{ "lcd",	I_LCHDIR },
	{ "lchdir",	I_LCHDIR },
	{ "lls",	I_LLS },
	{ "lmkdir",	I_LMKDIR },
	{ "ln",		I_SYMLINK },
	{ "lpwd",	I_LPWD },
	{ "ls",		I_LS },
	{ "lumask",	I_LUMASK },
	{ "mkdir",	I_MKDIR },
	{ "progress",	I_PROGRESS },
	{ "put",	I_PUT },
	{ "mput",	I_PUT },
	{ "pwd",	I_PWD },
	{ "quit",	I_QUIT },
	{ "rename",	I_RENAME },
	{ "rm",		I_RM },
	{ "rmdir",	I_RMDIR },
	{ "symlink",	I_SYMLINK },
	{ "version",	I_VERSION },
	{ "!",		I_SHELL },
	{ "?",		I_HELP },
	{ NULL,			-1}
};

int interactive_loop(int fd_in, int fd_out, char *file1, char *file2);

/* ARGSUSED */
static void
killchild(int signo)
{
	if (sshpid > 1) {
		kill(sshpid, SIGTERM);
		waitpid(sshpid, NULL, 0);
	}

	_exit(1);
}

/* ARGSUSED */
static void
cmd_interrupt(int signo)
{
	const char msg[] = "\rInterrupt  \n";
	int olderrno = errno;

	write(STDERR_FILENO, msg, sizeof(msg) - 1);
	interrupted = 1;
	errno = olderrno;
}

static void
help(void)
{
	printf(gettext("Available commands:\n"
	    "cd path                       Change remote directory to 'path'\n"
	    "lcd path                      Change local directory to 'path'\n"
	    "chgrp grp path                Change group of file 'path' to 'grp'\n"
	    "chmod mode path               Change permissions of file 'path' to 'mode'\n"
	    "chown own path                Change owner of file 'path' to 'own'\n"
	    "help                          Display this help text\n"
	    "get remote-path [local-path]  Download file\n"
	    "lls [ls-options [path]]       Display local directory listing\n"
	    "ln oldpath newpath            Symlink remote file\n"
	    "lmkdir path                   Create local directory\n"
	    "lpwd                          Print local working directory\n"
	    "ls [path]                     Display remote directory listing\n"
	    "lumask umask                  Set local umask to 'umask'\n"
	    "mkdir path                    Create remote directory\n"
	    "progress                      Toggle display of progress meter\n"
	    "put local-path [remote-path]  Upload file\n"
	    "pwd                           Display remote working directory\n"
	    "exit                          Quit sftp\n"
	    "quit                          Quit sftp\n"
	    "rename oldpath newpath        Rename remote file\n"
	    "rmdir path                    Remove remote directory\n"
	    "rm path                       Delete remote file\n"
	    "symlink oldpath newpath       Symlink remote file\n"
	    "version                       Show SFTP version\n"
	    "!command                      Execute 'command' in local shell\n"
	    "!                             Escape to local shell\n"
	    "?                             Synonym for help\n"));
}

static void
local_do_shell(const char *args)
{
	int status;
	char *shell;
	pid_t pid;

	if (!*args)
		args = NULL;

	if ((shell = getenv("SHELL")) == NULL)
		shell = _PATH_BSHELL;

	if ((pid = fork()) == -1)
		fatal("Couldn't fork: %s", strerror(errno));

	if (pid == 0) {
		/* XXX: child has pipe fds to ssh subproc open - issue? */
		if (args) {
			debug3("Executing %s -c \"%s\"", shell, args);
			execl(shell, shell, "-c", args, (char *)NULL);
		} else {
			debug3("Executing %s", shell);
			execl(shell, shell, (char *)NULL);
		}
		fprintf(stderr, gettext("Couldn't execute \"%s\": %s\n"), shell,
		    strerror(errno));
		_exit(1);
	}
	while (waitpid(pid, &status, 0) == -1)
		if (errno != EINTR)
			fatal("Couldn't wait for child: %s", strerror(errno));
	if (!WIFEXITED(status))
		error("Shell exited abnormally");
	else if (WEXITSTATUS(status))
		error("Shell exited with status %d", WEXITSTATUS(status));
}

static void
local_do_ls(const char *args)
{
	if (!args || !*args)
		local_do_shell(_PATH_LS);
	else {
		int len = strlen(_PATH_LS " ") + strlen(args) + 1;
		char *buf = xmalloc(len);

		/* XXX: quoting - rip quoting code from ftp? */
		snprintf(buf, len, _PATH_LS " %s", args);
		local_do_shell(buf);
		xfree(buf);
	}
}

/* Strip one path (usually the pwd) from the start of another */
static char *
path_strip(char *path, char *strip)
{
	size_t len;

	if (strip == NULL)
		return (xstrdup(path));

	len = strlen(strip);
	if (strncmp(path, strip, len) == 0) {
		if (strip[len - 1] != '/' && path[len] == '/')
			len++;
		return (xstrdup(path + len));
	}

	return (xstrdup(path));
}

static char *
path_append(char *p1, char *p2)
{
	char *ret;
	size_t len = strlen(p1) + strlen(p2) + 2;

	ret = xmalloc(len);
	strlcpy(ret, p1, len);
	if (p1[0] != '\0' && p1[strlen(p1) - 1] != '/')
		strlcat(ret, "/", len);
	strlcat(ret, p2, len);

	return(ret);
}

static char *
make_absolute(char *p, char *pwd)
{
	char *abs_str;

	/* Derelativise */
	if (p && p[0] != '/') {
		abs_str = path_append(pwd, p);
		xfree(p);
		return(abs_str);
	} else
		return(p);
}

static int
infer_path(const char *p, char **ifp)
{
	char *cp;

	cp = strrchr(p, '/');
	if (cp == NULL) {
		*ifp = xstrdup(p);
		return(0);
	}

	if (!cp[1]) {
		error("Invalid path");
		return(-1);
	}

	*ifp = xstrdup(cp + 1);
	return(0);
}

static int
parse_getput_flags(const char **cpp, int *pflag)
{
	const char *cp = *cpp;

	/* Check for flags */
	if (cp[0] == '-' && cp[1] && strchr(WHITESPACE, cp[2])) {
		switch (cp[1]) {
		case 'p':
		case 'P':
			*pflag = 1;
			break;
		default:
			error("Invalid flag -%c", cp[1]);
			return(-1);
		}
		cp += 2;
		*cpp = cp + strspn(cp, WHITESPACE);
	}

	return(0);
}

static int
parse_ls_flags(const char **cpp, int *lflag)
{
	const char *cp = *cpp;

	/* Defaults */
	*lflag = LS_NAME_SORT;

	/* Check for flags */
	if (cp++[0] == '-') {
		for (; strchr(WHITESPACE, *cp) == NULL; cp++) {
			switch (*cp) {
			case 'l':
				*lflag &= ~VIEW_FLAGS;
				*lflag |= LS_LONG_VIEW;
				break;
			case '1':
				*lflag &= ~VIEW_FLAGS;
				*lflag |= LS_SHORT_VIEW;
				break;
			case 'n':
				*lflag &= ~VIEW_FLAGS;
				*lflag |= LS_NUMERIC_VIEW|LS_LONG_VIEW;
				break;
			case 'S':
				*lflag &= ~SORT_FLAGS;
				*lflag |= LS_SIZE_SORT;
				break;
			case 't':
				*lflag &= ~SORT_FLAGS;
				*lflag |= LS_TIME_SORT;
				break;
			case 'r':
				*lflag |= LS_REVERSE_SORT;
				break;
			case 'f':
				*lflag &= ~SORT_FLAGS;
				break;
			case 'a':
				*lflag |= LS_SHOW_ALL;
				break;
			default:
				error("Invalid flag -%c", *cp);
				return(-1);
			}
		}
		*cpp = cp + strspn(cp, WHITESPACE);
	}

	return(0);
}

static int
get_pathname(const char **cpp, char **path)
{
	const char *cp = *cpp, *end;
	char quot;
	u_int i, j;

	cp += strspn(cp, WHITESPACE);
	if (!*cp) {
		*cpp = cp;
		*path = NULL;
		return (0);
	}

	*path = xmalloc(strlen(cp) + 1);

	/* Check for quoted filenames */
	if (*cp == '\"' || *cp == '\'') {
		quot = *cp++;

		/* Search for terminating quote, unescape some chars */
		for (i = j = 0; i <= strlen(cp); i++) {
			if (cp[i] == quot) {	/* Found quote */
				i++;
				(*path)[j] = '\0';
				break;
			}
			if (cp[i] == '\0') {	/* End of string */
				error("Unterminated quote");
				goto fail;
			}
			if (cp[i] == '\\') {	/* Escaped characters */
				i++;
				if (cp[i] != '\'' && cp[i] != '\"' &&
				    cp[i] != '\\') {
					error("Bad escaped character '\\%c'",
					    cp[i]);
					goto fail;
				}
			}
			(*path)[j++] = cp[i];
		}

		if (j == 0) {
			error("Empty quotes");
			goto fail;
		}
		*cpp = cp + i + strspn(cp + i, WHITESPACE);
	} else {
		/* Read to end of filename */
		end = strpbrk(cp, WHITESPACE);
		if (end == NULL)
			end = strchr(cp, '\0');
		*cpp = end + strspn(end, WHITESPACE);

		memcpy(*path, cp, end - cp);
		(*path)[end - cp] = '\0';
	}
	return (0);

 fail:
	xfree(*path);
	*path = NULL;
	return (-1);
}

static int
is_dir(char *path)
{
	struct stat sb;

	/* XXX: report errors? */
	if (stat(path, &sb) == -1)
		return(0);

	return(S_ISDIR(sb.st_mode));
}

static int
is_reg(char *path)
{
	struct stat sb;

	if (stat(path, &sb) == -1)
		fatal("stat %s: %s", path, strerror(errno));

	return(S_ISREG(sb.st_mode));
}

static int
remote_is_dir(struct sftp_conn *conn, char *path)
{
	Attrib *a;

	/* XXX: report errors? */
	if ((a = do_stat(conn, path, 1)) == NULL)
		return(0);
	if (!(a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS))
		return(0);
	return(S_ISDIR(a->perm));
}

static int
process_get(struct sftp_conn *conn, char *src, char *dst, char *pwd, int pflag)
{
	char *abs_src = NULL;
	char *abs_dst = NULL;
	char *tmp;
	glob_t g;
	int err = 0;
	int i;

	abs_src = xstrdup(src);
	abs_src = make_absolute(abs_src, pwd);

	memset(&g, 0, sizeof(g));
	debug3("Looking up %s", abs_src);
	if (remote_glob(conn, abs_src, 0, NULL, &g)) {
		error("File \"%s\" not found.", abs_src);
		err = -1;
		goto out;
	}

	/* If multiple matches, dst must be a directory or unspecified */
	if (g.gl_matchc > 1 && dst && !is_dir(dst)) {
		error("Multiple files match, but \"%s\" is not a directory",
		    dst);
		err = -1;
		goto out;
	}

	for (i = 0; g.gl_pathv[i] && !interrupted; i++) {
		if (infer_path(g.gl_pathv[i], &tmp)) {
			err = -1;
			goto out;
		}

		if (g.gl_matchc == 1 && dst) {
			/* If directory specified, append filename */
			xfree(tmp);
			if (is_dir(dst)) {
				if (infer_path(g.gl_pathv[0], &tmp)) {
					err = 1;
					goto out;
				}
				abs_dst = path_append(dst, tmp);
				xfree(tmp);
			} else
				abs_dst = xstrdup(dst);
		} else if (dst) {
			abs_dst = path_append(dst, tmp);
			xfree(tmp);
		} else
			abs_dst = tmp;

		printf(gettext("Fetching %s to %s\n"), g.gl_pathv[i], abs_dst);
		if (do_download(conn, g.gl_pathv[i], abs_dst, pflag) == -1)
			err = -1;
		xfree(abs_dst);
		abs_dst = NULL;
	}

out:
	xfree(abs_src);
	globfree(&g);
	return(err);
}

static int
process_put(struct sftp_conn *conn, char *src, char *dst, char *pwd, int pflag)
{
	char *tmp_dst = NULL;
	char *abs_dst = NULL;
	char *tmp;
	glob_t g;
	int err = 0;
	int i;

	if (dst) {
		tmp_dst = xstrdup(dst);
		tmp_dst = make_absolute(tmp_dst, pwd);
	}

	memset(&g, 0, sizeof(g));
	debug3("Looking up %s", src);
	if (glob(src, GLOB_LIMIT, NULL, &g)) {
		error("File \"%s\" not found.", src);
		err = -1;
		goto out;
	}

	/* If multiple matches, dst may be directory or unspecified */
	if (g.gl_matchc > 1 && tmp_dst && !remote_is_dir(conn, tmp_dst)) {
		error("Multiple files match, but \"%s\" is not a directory",
		    tmp_dst);
		err = -1;
		goto out;
	}

	for (i = 0; g.gl_pathv[i] && !interrupted; i++) {
		if (!is_reg(g.gl_pathv[i])) {
			error("skipping non-regular file %s",
			    g.gl_pathv[i]);
			continue;
		}
		if (infer_path(g.gl_pathv[i], &tmp)) {
			err = -1;
			goto out;
		}

		if (g.gl_matchc == 1 && tmp_dst) {
			/* If directory specified, append filename */
			if (remote_is_dir(conn, tmp_dst)) {
				if (infer_path(g.gl_pathv[0], &tmp)) {
					err = 1;
					goto out;
				}
				abs_dst = path_append(tmp_dst, tmp);
				xfree(tmp);
			} else
				abs_dst = xstrdup(tmp_dst);

		} else if (tmp_dst) {
			abs_dst = path_append(tmp_dst, tmp);
			xfree(tmp);
		} else
			abs_dst = make_absolute(tmp, pwd);

		printf(gettext("Uploading %s to %s\n"), g.gl_pathv[i], abs_dst);
		if (do_upload(conn, g.gl_pathv[i], abs_dst, pflag) == -1)
			err = -1;
	}

out:
	if (abs_dst)
		xfree(abs_dst);
	if (tmp_dst)
		xfree(tmp_dst);
	globfree(&g);
	return(err);
}

static int
sdirent_comp(const void *aa, const void *bb)
{
	SFTP_DIRENT *a = *(SFTP_DIRENT **)aa;
	SFTP_DIRENT *b = *(SFTP_DIRENT **)bb;
	int rmul = sort_flag & LS_REVERSE_SORT ? -1 : 1;

#define NCMP(a,b) (a == b ? 0 : (a < b ? 1 : -1))
	if (sort_flag & LS_NAME_SORT)
		return (rmul * strcmp(a->filename, b->filename));
	else if (sort_flag & LS_TIME_SORT)
		return (rmul * NCMP(a->a.mtime, b->a.mtime));
	else if (sort_flag & LS_SIZE_SORT)
		return (rmul * NCMP(a->a.size, b->a.size));

	fatal("Unknown ls sort type");

	/* NOTREACHED */
	return (0);
}

/* sftp ls.1 replacement for directories */
static int
do_ls_dir(struct sftp_conn *conn, char *path, char *strip_path, int lflag)
{
	int n;
	u_int c = 1, colspace = 0, columns = 1;
	SFTP_DIRENT **d;

	if ((n = do_readdir(conn, path, &d)) != 0)
		return (n);

	if (!(lflag & LS_SHORT_VIEW)) {
		u_int m = 0, width = 80;
		struct winsize ws;
		char *tmp;

		/* Count entries for sort and find longest filename */
		for (n = 0; d[n] != NULL; n++) {
			if (d[n]->filename[0] != '.' || (lflag & LS_SHOW_ALL))
				m = MAX(m, strlen(d[n]->filename));
		}

		/* Add any subpath that also needs to be counted */
		tmp = path_strip(path, strip_path);
		m += strlen(tmp);
		xfree(tmp);

		if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) != -1)
			width = ws.ws_col;

		columns = width / (m + 2);
		columns = MAX(columns, 1);
		colspace = width / columns;
		colspace = MIN(colspace, width);
	}

	if (lflag & SORT_FLAGS) {
		for (n = 0; d[n] != NULL; n++)
			;	/* count entries */
		sort_flag = lflag & (SORT_FLAGS|LS_REVERSE_SORT);
		qsort(d, n, sizeof(*d), sdirent_comp);
	}

	for (n = 0; d[n] != NULL && !interrupted; n++) {
		char *tmp, *fname;

		if (d[n]->filename[0] == '.' && !(lflag & LS_SHOW_ALL))
			continue;

		tmp = path_append(path, d[n]->filename);
		fname = path_strip(tmp, strip_path);
		xfree(tmp);

		if (lflag & LS_LONG_VIEW) {
			if (lflag & LS_NUMERIC_VIEW) {
				char *lname;
				struct stat sb;

				memset(&sb, 0, sizeof(sb));
				attrib_to_stat(&d[n]->a, &sb);
				lname = ls_file(fname, &sb, 1);
				printf("%s\n", lname);
				xfree(lname);
			} else
				printf("%s\n", d[n]->longname);
		} else {
			printf("%-*s", colspace, fname);
			if (c >= columns) {
				printf("\n");
				c = 1;
			} else
				c++;
		}

		xfree(fname);
	}

	if (!(lflag & LS_LONG_VIEW) && (c != 1))
		printf("\n");

	free_sftp_dirents(d);
	return (0);
}

/* sftp ls.1 replacement which handles path globs */
static int
do_globbed_ls(struct sftp_conn *conn, char *path, char *strip_path,
    int lflag)
{
	glob_t g;
	u_int i, c = 1, colspace = 0, columns = 1;
	Attrib *a = NULL;

	memset(&g, 0, sizeof(g));

	if (remote_glob(conn, path, GLOB_MARK|GLOB_NOCHECK|GLOB_BRACE,
	    NULL, &g) || (g.gl_pathc && !g.gl_matchc)) {
		if (g.gl_pathc)
			globfree(&g);
		error("Can't ls: \"%s\" not found", path);
		return (-1);
	}

	if (interrupted)
		goto out;

	/*
	 * If the glob returns a single match and it is a directory,
	 * then just list its contents.
	 */
	if (g.gl_matchc == 1) {
		if ((a = do_lstat(conn, g.gl_pathv[0], 1)) == NULL) {
			globfree(&g);
			return (-1);
		}
		if ((a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) &&
		    S_ISDIR(a->perm)) {
			int err;

			err = do_ls_dir(conn, g.gl_pathv[0], strip_path, lflag);
			globfree(&g);
			return (err);
		}
	}

	if (!(lflag & LS_SHORT_VIEW)) {
		u_int m = 0, width = 80;
		struct winsize ws;

		/* Count entries for sort and find longest filename */
		for (i = 0; g.gl_pathv[i]; i++)
			m = MAX(m, strlen(g.gl_pathv[i]));

		if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) != -1)
			width = ws.ws_col;

		columns = width / (m + 2);
		columns = MAX(columns, 1);
		colspace = width / columns;
	}

	for (i = 0; g.gl_pathv[i] && !interrupted; i++, a = NULL) {
		char *fname;

		fname = path_strip(g.gl_pathv[i], strip_path);

		if (lflag & LS_LONG_VIEW) {
			char *lname;
			struct stat sb;

			/*
			 * XXX: this is slow - 1 roundtrip per path
			 * A solution to this is to fork glob() and
			 * build a sftp specific version which keeps the
			 * attribs (which currently get thrown away)
			 * that the server returns as well as the filenames.
			 */
			memset(&sb, 0, sizeof(sb));
			if (a == NULL)
				a = do_lstat(conn, g.gl_pathv[i], 1);
			if (a != NULL)
				attrib_to_stat(a, &sb);
			lname = ls_file(fname, &sb, 1);
			printf("%s\n", lname);
			xfree(lname);
		} else {
			printf("%-*s", colspace, fname);
			if (c >= columns) {
				printf("\n");
				c = 1;
			} else
				c++;
		}
		xfree(fname);
	}

	if (!(lflag & LS_LONG_VIEW) && (c != 1))
		printf("\n");

 out:
	if (g.gl_pathc)
		globfree(&g);

	return (0);
}

static int
parse_args(const char **cpp, int *pflag, int *lflag, int *iflag,
    unsigned long *n_arg, char **path1, char **path2)
{
	const char *cmd, *cp = *cpp;
	char *cp2;
	int base = 0;
	long l;
	int i, cmdnum;

	/* Skip leading whitespace */
	cp = cp + strspn(cp, WHITESPACE);

	/* Ignore blank lines and lines which begin with comment '#' char */
	if (*cp == '\0' || *cp == '#')
		return (0);

	/* Check for leading '-' (disable error processing) */
	*iflag = 0;
	if (*cp == '-') {
		*iflag = 1;
		cp++;
	}

	/* Figure out which command we have */
	for (i = 0; cmds[i].c; i++) {
		int cmdlen = strlen(cmds[i].c);

		/* Check for command followed by whitespace */
		if (!strncasecmp(cp, cmds[i].c, cmdlen) &&
		    strchr(WHITESPACE, cp[cmdlen])) {
			cp += cmdlen;
			cp = cp + strspn(cp, WHITESPACE);
			break;
		}
	}
	cmdnum = cmds[i].n;
	cmd = cmds[i].c;

	/* Special case */
	if (*cp == '!') {
		cp++;
		cmdnum = I_SHELL;
	} else if (cmdnum == -1) {
		error("Invalid command.");
		return (-1);
	}

	/* Get arguments and parse flags */
	*lflag = *pflag = *n_arg = 0;
	*path1 = *path2 = NULL;
	switch (cmdnum) {
	case I_GET:
	case I_PUT:
		if (parse_getput_flags(&cp, pflag))
			return(-1);
		/* Get first pathname (mandatory) */
		if (get_pathname(&cp, path1))
			return(-1);
		if (*path1 == NULL) {
			error("You must specify at least one path after a "
			    "%s command.", cmd);
			return(-1);
		}
		/* Try to get second pathname (optional) */
		if (get_pathname(&cp, path2))
			return(-1);
		break;
	case I_RENAME:
	case I_SYMLINK:
		if (get_pathname(&cp, path1))
			return(-1);
		if (get_pathname(&cp, path2))
			return(-1);
		if (!*path1 || !*path2) {
			error("You must specify two paths after a %s "
			    "command.", cmd);
			return(-1);
		}
		break;
	case I_RM:
	case I_MKDIR:
	case I_RMDIR:
	case I_CHDIR:
	case I_LCHDIR:
	case I_LMKDIR:
		/* Get pathname (mandatory) */
		if (get_pathname(&cp, path1))
			return(-1);
		if (*path1 == NULL) {
			error("You must specify a path after a %s command.",
			    cmd);
			return(-1);
		}
		break;
	case I_LS:
		if (parse_ls_flags(&cp, lflag))
			return(-1);
		/* Path is optional */
		if (get_pathname(&cp, path1))
			return(-1);
		break;
	case I_LLS:
	case I_SHELL:
		/* Uses the rest of the line */
		break;
	case I_LUMASK:
		base = 8;
		/* FALLTHRU */
	case I_CHMOD:
		base = 8;
		/* FALLTHRU */
	case I_CHOWN:
	case I_CHGRP:
		/* Get numeric arg (mandatory) */
		errno = 0;
		l = strtol(cp, &cp2, base);
		if (cp2 == cp || ((l == LONG_MIN || l == LONG_MAX) &&
		    errno == ERANGE) || l < 0) {
			error("You must supply a numeric argument "
			    "to the %s command.", cmd);
			return(-1);
		}
		cp = cp2;
		*n_arg = l;
		if (cmdnum == I_LUMASK && strchr(WHITESPACE, *cp))
			break;
		if (cmdnum == I_LUMASK || !strchr(WHITESPACE, *cp)) {
			error("You must supply a numeric argument "
			    "to the %s command.", cmd);
			return(-1);
		}
		cp += strspn(cp, WHITESPACE);

		/* Get pathname (mandatory) */
		if (get_pathname(&cp, path1))
			return(-1);
		if (*path1 == NULL) {
			error("You must specify a path after a %s command.",
			    cmd);
			return(-1);
		}
		break;
	case I_QUIT:
	case I_PWD:
	case I_LPWD:
	case I_HELP:
	case I_VERSION:
	case I_PROGRESS:
		break;
	default:
		fatal("Command not implemented");
	}

	*cpp = cp;
	return(cmdnum);
}

static int
parse_dispatch_command(struct sftp_conn *conn, const char *cmd, char **pwd,
    int err_abort)
{
	char *path1, *path2, *tmp;
	int pflag, lflag, iflag, cmdnum, i;
	unsigned long n_arg;
	Attrib a, *aa;
	char path_buf[MAXPATHLEN];
	int err = 0;
	glob_t g;

	path1 = path2 = NULL;
	cmdnum = parse_args(&cmd, &pflag, &lflag, &iflag, &n_arg,
	    &path1, &path2);

	if (iflag != 0)
		err_abort = 0;

	memset(&g, 0, sizeof(g));

	/* Perform command */
	switch (cmdnum) {
	case 0:
		/* Blank line */
		break;
	case -1:
		/* Unrecognized command */
		err = -1;
		break;
	case I_GET:
		err = process_get(conn, path1, path2, *pwd, pflag);
		break;
	case I_PUT:
		err = process_put(conn, path1, path2, *pwd, pflag);
		break;
	case I_RENAME:
		path1 = make_absolute(path1, *pwd);
		path2 = make_absolute(path2, *pwd);
		err = do_rename(conn, path1, path2);
		break;
	case I_SYMLINK:
		path2 = make_absolute(path2, *pwd);
		err = do_symlink(conn, path1, path2);
		break;
	case I_RM:
		path1 = make_absolute(path1, *pwd);
		remote_glob(conn, path1, GLOB_NOCHECK, NULL, &g);
		for (i = 0; g.gl_pathv[i] && !interrupted; i++) {
			printf(gettext("Removing %s\n"), g.gl_pathv[i]);
			err = do_rm(conn, g.gl_pathv[i]);
			if (err != 0 && err_abort)
				break;
		}
		break;
	case I_MKDIR:
		path1 = make_absolute(path1, *pwd);
		attrib_clear(&a);
		a.flags |= SSH2_FILEXFER_ATTR_PERMISSIONS;
		a.perm = 0777;
		err = do_mkdir(conn, path1, &a);
		break;
	case I_RMDIR:
		path1 = make_absolute(path1, *pwd);
		err = do_rmdir(conn, path1);
		break;
	case I_CHDIR:
		path1 = make_absolute(path1, *pwd);
		if ((tmp = do_realpath(conn, path1)) == NULL) {
			err = 1;
			break;
		}
		if ((aa = do_stat(conn, tmp, 0)) == NULL) {
			xfree(tmp);
			err = 1;
			break;
		}
		if (!(aa->flags & SSH2_FILEXFER_ATTR_PERMISSIONS)) {
			error("Can't change directory: Can't check target");
			xfree(tmp);
			err = 1;
			break;
		}
		if (!S_ISDIR(aa->perm)) {
			error("Can't change directory: \"%s\" is not "
			    "a directory", tmp);
			xfree(tmp);
			err = 1;
			break;
		}
		xfree(*pwd);
		*pwd = tmp;
		break;
	case I_LS:
		if (!path1) {
			do_globbed_ls(conn, *pwd, *pwd, lflag);
			break;
		}

		/* Strip pwd off beginning of non-absolute paths */
		tmp = NULL;
		if (*path1 != '/')
			tmp = *pwd;

		path1 = make_absolute(path1, *pwd);
		err = do_globbed_ls(conn, path1, tmp, lflag);
		break;
	case I_LCHDIR:
		if (chdir(path1) == -1) {
			error("Couldn't change local directory to "
			    "\"%s\": %s", path1, strerror(errno));
			err = 1;
		}
		break;
	case I_LMKDIR:
		if (mkdir(path1, 0777) == -1) {
			error("Couldn't create local directory "
			    "\"%s\": %s", path1, strerror(errno));
			err = 1;
		}
		break;
	case I_LLS:
		local_do_ls(cmd);
		break;
	case I_SHELL:
		local_do_shell(cmd);
		break;
	case I_LUMASK:
		umask(n_arg);
		printf(gettext("Local umask: %03lo\n"), n_arg);
		break;
	case I_CHMOD:
		path1 = make_absolute(path1, *pwd);
		attrib_clear(&a);
		a.flags |= SSH2_FILEXFER_ATTR_PERMISSIONS;
		a.perm = n_arg;
		remote_glob(conn, path1, GLOB_NOCHECK, NULL, &g);
		for (i = 0; g.gl_pathv[i] && !interrupted; i++) {
			printf(gettext("Changing mode on %s\n"), g.gl_pathv[i]);
			err = do_setstat(conn, g.gl_pathv[i], &a);
			if (err != 0 && err_abort)
				break;
		}
		break;
	case I_CHOWN:
	case I_CHGRP:
		path1 = make_absolute(path1, *pwd);
		remote_glob(conn, path1, GLOB_NOCHECK, NULL, &g);
		for (i = 0; g.gl_pathv[i] && !interrupted; i++) {
			if (!(aa = do_stat(conn, g.gl_pathv[i], 0))) {
				if (err != 0 && err_abort)
					break;
				else
					continue;
			}
			if (!(aa->flags & SSH2_FILEXFER_ATTR_UIDGID)) {
				error("Can't get current ownership of "
				    "remote file \"%s\"", g.gl_pathv[i]);
				if (err != 0 && err_abort)
					break;
				else
					continue;
			}
			aa->flags &= SSH2_FILEXFER_ATTR_UIDGID;
			if (cmdnum == I_CHOWN) {
				printf(gettext("Changing owner on %s\n"), g.gl_pathv[i]);
				aa->uid = n_arg;
			} else {
				printf(gettext("Changing group on %s\n"), g.gl_pathv[i]);
				aa->gid = n_arg;
			}
			err = do_setstat(conn, g.gl_pathv[i], aa);
			if (err != 0 && err_abort)
				break;
		}
		break;
	case I_PWD:
		printf(gettext("Remote working directory: %s\n"), *pwd);
		break;
	case I_LPWD:
		if (!getcwd(path_buf, sizeof(path_buf))) {
			error("Couldn't get local cwd: %s", strerror(errno));
			err = -1;
			break;
		}
		printf(gettext("Local working directory: %s\n"), path_buf);
		break;
	case I_QUIT:
		/* Processed below */
		break;
	case I_HELP:
		help();
		break;
	case I_VERSION:
		printf(gettext("SFTP protocol version %u\n"), sftp_proto_version(conn));
		break;
	case I_PROGRESS:
		showprogress = !showprogress;
		if (showprogress)
			printf("Progress meter enabled\n");
		else
			printf("Progress meter disabled\n");
		break;
	default:
		fatal("%d is not implemented", cmdnum);
	}

	if (g.gl_pathc)
		globfree(&g);
	if (path1)
		xfree(path1);
	if (path2)
		xfree(path2);

	/* If an unignored error occurs in batch mode we should abort. */
	if (err_abort && err != 0)
		return (-1);
	else if (cmdnum == I_QUIT)
		return (1);

	return (0);
}

#ifdef USE_LIBEDIT
static char *
prompt(EditLine *el)
{
	return ("sftp> ");
}
#else
#ifdef USE_LIBTECLA
/*
 * Disable default TAB completion for filenames, because it displays local
 * files for every commands, which is not desirable.
 */
static
CPL_MATCH_FN(nomatch)
{
	return (0);
}
#endif /* USE_LIBTECLA */
#endif /* USE_LIBEDIT */

int
interactive_loop(int fd_in, int fd_out, char *file1, char *file2)
{
	char *pwd;
	char *dir = NULL;
	char cmd[2048];
	struct sftp_conn *conn;
	int err, interactive;
	void *il = NULL;

#ifdef USE_LIBEDIT
        EditLine *el = NULL;
	History *hl = NULL;
	HistEvent hev;

	if (!batchmode && isatty(STDIN_FILENO)) {
		if ((il = el = el_init(__progname, stdin, stdout, stderr)) == NULL)
			fatal("Couldn't initialise editline");
		if ((hl = history_init()) == NULL)
			fatal("Couldn't initialise editline history");
		history(hl, &hev, H_SETSIZE, 100);
		el_set(el, EL_HIST, history, hl);

		el_set(el, EL_PROMPT, prompt);
		el_set(el, EL_EDITOR, "emacs");
		el_set(el, EL_TERMINAL, NULL);
		el_set(el, EL_SIGNAL, 1);
		el_source(el, NULL);
	}
#else
#ifdef USE_LIBTECLA
	GetLine *gl = NULL;

	if (!batchmode && isatty(STDIN_FILENO)) {
		if ((il = gl = new_GetLine(MAX_LINE_LEN, MAX_CMD_HIST)) == NULL)
			fatal("Couldn't initialize GetLine");
		if (gl_customize_completion(gl, NULL, nomatch) != 0) {
			(void) del_GetLine(gl);
			fatal("Couldn't register completion function");
		}
	}
#endif /* USE_LIBTECLA */
#endif /* USE_LIBEDIT */

	conn = do_init(fd_in, fd_out, copy_buffer_len, num_requests);
	if (conn == NULL)
		fatal("Couldn't initialise connection to server");

	pwd = do_realpath(conn, ".");
	if (pwd == NULL)
		fatal("Need cwd");

	if (file1 != NULL) {
		dir = xstrdup(file1);
		dir = make_absolute(dir, pwd);

		if (remote_is_dir(conn, dir) && file2 == NULL) {
			printf(gettext("Changing to: %s\n"), dir);
			snprintf(cmd, sizeof cmd, "cd \"%s\"", dir);
			if (parse_dispatch_command(conn, cmd, &pwd, 1) != 0) {
				xfree(dir);
				xfree(pwd);
				xfree(conn);
				return (-1);
			}
		} else {
			if (file2 == NULL)
				snprintf(cmd, sizeof cmd, "get %s", dir);
			else
				snprintf(cmd, sizeof cmd, "get %s %s", dir,
				    file2);

			err = parse_dispatch_command(conn, cmd, &pwd, 1);
			xfree(dir);
			xfree(pwd);
			xfree(conn);
			return (err);
		}
		xfree(dir);
	}

#if defined(HAVE_SETVBUF) && !defined(BROKEN_SETVBUF)
	setvbuf(stdout, NULL, _IOLBF, 0);
	setvbuf(infile, NULL, _IOLBF, 0);
#else
	setlinebuf(stdout);
	setlinebuf(infile);
#endif

	interactive = !batchmode && isatty(STDIN_FILENO);
	err = 0;
	for (;;) {
		char *cp;

		signal(SIGINT, SIG_IGN);

		if (il == NULL) {
			if (interactive)
				printf("sftp> ");
			if (fgets(cmd, sizeof(cmd), infile) == NULL) {
				if (interactive)
					printf("\n");
				break;
			}
			if (!interactive) { /* Echo command */
				printf("sftp> %s", cmd);
				if (strlen(cmd) > 0 &&
				    cmd[strlen(cmd) - 1] != '\n')
					printf("\n");
			}
		}
#ifdef USE_LIBEDIT
		else {
			const char *line;
			int count = 0;

			if ((line = el_gets(el, &count)) == NULL || count <= 0) {
				printf("\n");
 				break;
			}
			history(hl, &hev, H_ENTER, line);
			if (strlcpy(cmd, line, sizeof(cmd)) >= sizeof(cmd)) {
				fprintf(stderr, gettext("Error: input line too long\n"));
				continue;
			}
		}
#else
#ifdef USE_LIBTECLA
		else {
			const char *line;

			line = gl_get_line(gl, "sftp> ", NULL, -1);
			if (line != NULL) {
				if (strlcpy(cmd, line, sizeof(cmd)) >=
				    sizeof(cmd)) {
					fprintf(stderr, gettext(
					    "Error: input line too long\n"));
					continue;
				}
			} else {
				GlReturnStatus rtn;

				rtn = gl_return_status(gl);
				if (rtn == GLR_SIGNAL) {
					gl_abandon_line(gl);
					continue;
				} else if (rtn == GLR_ERROR) {
					fprintf(stderr, gettext(
					    "Error reading terminal: %s/\n"),
					    gl_error_message(gl, NULL, 0));
				}
				break;
			}
		}
#endif /* USE_LIBTECLA */
#endif /* USE_LIBEDIT */

		cp = strrchr(cmd, '\n');
		if (cp)
			*cp = '\0';

		/* Handle user interrupts gracefully during commands */
		interrupted = 0;
		signal(SIGINT, cmd_interrupt);

		err = parse_dispatch_command(conn, cmd, &pwd, batchmode);
		if (err != 0)
			break;
	}
	xfree(pwd);
	xfree(conn);

#ifdef USE_LIBEDIT
	if (el != NULL)
		el_end(el);
#else
#ifdef USE_LIBTECLA
	if (gl != NULL)
		(void) del_GetLine(gl);
#endif /* USE_LIBTECLA */
#endif /* USE_LIBEDIT */

	/* err == 1 signifies normal "quit" exit */
	return (err >= 0 ? 0 : -1);
}

static void
connect_to_server(char *path, char **args, int *in, int *out)
{
	int c_in, c_out;

	int inout[2];

	if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) == -1)
		fatal("socketpair: %s", strerror(errno));
	*in = *out = inout[0];
	c_in = c_out = inout[1];

	if ((sshpid = fork()) == -1)
		fatal("fork: %s", strerror(errno));
	else if (sshpid == 0) {
		if ((dup2(c_in, STDIN_FILENO) == -1) ||
		    (dup2(c_out, STDOUT_FILENO) == -1)) {
			fprintf(stderr, "dup2: %s\n", strerror(errno));
			_exit(1);
		}
		close(*in);
		close(*out);
		close(c_in);
		close(c_out);

		/*
		 * The underlying ssh is in the same process group, so we must
		 * ignore SIGINT if we want to gracefully abort commands,
		 * otherwise the signal will make it to the ssh process and
		 * kill it too
		 */
		signal(SIGINT, SIG_IGN);
		execvp(path, args);
		fprintf(stderr, "exec: %s: %s\n", path, strerror(errno));
		_exit(1);
	}

	signal(SIGTERM, killchild);
	signal(SIGINT, killchild);
	signal(SIGHUP, killchild);
	close(c_in);
	close(c_out);
}

static void
usage(void)
{
	fprintf(stderr,
	    gettext("Usage: %s [-1Cv] [-b batchfile] [-B buffer_size]\n"
	    "            [-F ssh_config] [-o ssh_option] [-P sftp_server_path]\n"
	    "            [-R num_requests] [-s subsystem | sftp_server]\n"
	    "            [-S program] [user@]host[:dir[/] | :file [file]]\n"),
	    __progname, __progname, __progname, __progname);
	exit(1);
}

int
main(int argc, char **argv)
{
	int in, out, ch, err;
	char *host, *userhost, *cp, *file2 = NULL;
	int debug_level = 0, sshver = 2;
	char *file1 = NULL, *sftp_server = NULL;
	char *ssh_program = _PATH_SSH_PROGRAM, *sftp_direct = NULL;
	LogLevel ll = SYSLOG_LEVEL_INFO;
	arglist args;
	extern int optind;
	extern char *optarg;

	/* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
	sanitise_stdfd();

	__progname = get_progname(argv[0]);

	(void) g11n_setlocale(LC_ALL, "");

	memset(&args, '\0', sizeof(args));
	args.list = NULL;
	addargs(&args, "%s", ssh_program);
	addargs(&args, "-oForwardX11 no");
	addargs(&args, "-oForwardAgent no");
	addargs(&args, "-oClearAllForwardings yes");

	ll = SYSLOG_LEVEL_INFO;
	infile = stdin;

	while ((ch = getopt(argc, argv, "1hvCo:s:S:b:B:F:P:R:")) != -1) {
		switch (ch) {
		case 'C':
			addargs(&args, "-C");
			break;
		case 'v':
			if (debug_level < 3) {
				addargs(&args, "-v");
				ll = SYSLOG_LEVEL_DEBUG1 + debug_level;
			}
			debug_level++;
			break;
		case 'F':
		case 'o':
			addargs(&args, "-%c%s", ch, optarg);
			break;
		case '1':
			sshver = 1;
			if (sftp_server == NULL)
				sftp_server = _PATH_SFTP_SERVER;
			break;
		case 's':
			sftp_server = optarg;
			break;
		case 'S':
			ssh_program = optarg;
			replacearg(&args, 0, "%s", ssh_program);
			break;
		case 'b':
			if (batchmode)
				fatal("Batch file already specified.");

			/* Allow "-" as stdin */
			if (strcmp(optarg, "-") != 0 &&
			    (infile = fopen(optarg, "r")) == NULL)
				fatal("%s (%s).", strerror(errno), optarg);
			showprogress = 0;
			batchmode = 1;
			addargs(&args, "-obatchmode yes");
			break;
		case 'P':
			sftp_direct = optarg;
			break;
		case 'B':
			copy_buffer_len = strtol(optarg, &cp, 10);
			if (copy_buffer_len == 0 || *cp != '\0')
				fatal("Invalid buffer size \"%s\"", optarg);
			break;
		case 'R':
			num_requests = strtol(optarg, &cp, 10);
			if (num_requests == 0 || *cp != '\0')
				fatal("Invalid number of requests \"%s\"",
				    optarg);
			break;
		case 'h':
		default:
			usage();
		}
	}

	if (!isatty(STDERR_FILENO))
		showprogress = 0;

	log_init(argv[0], ll, SYSLOG_FACILITY_USER, 1);

	if (sftp_direct == NULL) {
		if (optind == argc || argc > (optind + 2))
			usage();

		userhost = xstrdup(argv[optind]);
		file2 = argv[optind+1];

		if ((host = strrchr(userhost, '@')) == NULL)
			host = userhost;
		else {
			*host++ = '\0';
			if (!userhost[0]) {
				fprintf(stderr, gettext("Missing username\n"));
				usage();
			}
			addargs(&args, "-l%s", userhost);
		}

		if ((cp = colon(host)) != NULL) {
			*cp++ = '\0';
			file1 = cp;
		}

		host = cleanhostname(host);
		if (!*host) {
			fprintf(stderr, gettext("Missing hostname\n"));
			usage();
		}

		addargs(&args, "-oProtocol %d", sshver);

		/* no subsystem if the server-spec contains a '/' */
		if (sftp_server == NULL || strchr(sftp_server, '/') == NULL)
			addargs(&args, "-s");

		addargs(&args, "%s", host);
		addargs(&args, "%s", (sftp_server != NULL ?
		    sftp_server : "sftp"));

		if (!batchmode)
			fprintf(stderr, gettext("Connecting to %s...\n"), host);
		connect_to_server(ssh_program, args.list, &in, &out);
	} else {
		args.list = NULL;
		addargs(&args, "sftp-server");

		if (!batchmode)
			fprintf(stderr, gettext("Attaching to %s...\n"), sftp_direct);
		connect_to_server(sftp_direct, args.list, &in, &out);
	}
	freeargs(&args);

	err = interactive_loop(in, out, file1, file2);

	shutdown(in, SHUT_RDWR);
	shutdown(out, SHUT_RDWR);

	close(in);
	close(out);
	if (batchmode)
		fclose(infile);

	while (waitpid(sshpid, NULL, 0) == -1)
		if (errno != EINTR)
			fatal("Couldn't wait for ssh process: %s",
			    strerror(errno));

	return (err == 0 ? 0 : 1);
}