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freebsd-nq/sftp.c
Dag-Erling Smørgrav ad22e48f1a Vendor import of OpenSSH 4.9p1 for posterity's sake
2008-07-23 09:28:49 +00:00

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/* $OpenBSD: sftp.c,v 1.99 2008/01/20 00:38:30 djm Exp $ */
/*
* 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.
*/
#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 <ctype.h>
#include <errno.h>
#ifdef HAVE_PATHS_H
# include <paths.h>
#endif
#ifdef USE_LIBEDIT
#include <histedit.h>
#else
typedef void EditLine;
#endif
#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"
/* 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 */
extern char *__progname;
/* 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("Available commands:\n");
printf("cd path Change remote directory to 'path'\n");
printf("lcd path Change local directory to 'path'\n");
printf("chgrp grp path Change group of file 'path' to 'grp'\n");
printf("chmod mode path Change permissions of file 'path' to 'mode'\n");
printf("chown own path Change owner of file 'path' to 'own'\n");
printf("help Display this help text\n");
printf("get remote-path [local-path] Download file\n");
printf("lls [ls-options [path]] Display local directory listing\n");
printf("ln oldpath newpath Symlink remote file\n");
printf("lmkdir path Create local directory\n");
printf("lpwd Print local working directory\n");
printf("ls [path] Display remote directory listing\n");
printf("lumask umask Set local umask to 'umask'\n");
printf("mkdir path Create remote directory\n");
printf("progress Toggle display of progress meter\n");
printf("put local-path [remote-path] Upload file\n");
printf("pwd Display remote working directory\n");
printf("exit Quit sftp\n");
printf("quit Quit sftp\n");
printf("rename oldpath newpath Rename remote file\n");
printf("rmdir path Remove remote directory\n");
printf("rm path Delete remote file\n");
printf("symlink oldpath newpath Symlink remote file\n");
printf("version Show SFTP version\n");
printf("!command Execute 'command' in local shell\n");
printf("! Escape to local shell\n");
printf("? 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, "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 *cmd, char **argv, int argc, int *pflag)
{
extern int optind, optreset, opterr;
int ch;
optind = optreset = 1;
opterr = 0;
*pflag = 0;
while ((ch = getopt(argc, argv, "Pp")) != -1) {
switch (ch) {
case 'p':
case 'P':
*pflag = 1;
break;
default:
error("%s: Invalid flag -%c", cmd, ch);
return -1;
}
}
return optind;
}
static int
parse_ls_flags(char **argv, int argc, int *lflag)
{
extern int optind, optreset, opterr;
int ch;
optind = optreset = 1;
opterr = 0;
*lflag = LS_NAME_SORT;
while ((ch = getopt(argc, argv, "1Saflnrt")) != -1) {
switch (ch) {
case '1':
*lflag &= ~VIEW_FLAGS;
*lflag |= LS_SHORT_VIEW;
break;
case 'S':
*lflag &= ~SORT_FLAGS;
*lflag |= LS_SIZE_SORT;
break;
case 'a':
*lflag |= LS_SHOW_ALL;
break;
case 'f':
*lflag &= ~SORT_FLAGS;
break;
case 'l':
*lflag &= ~VIEW_FLAGS;
*lflag |= LS_LONG_VIEW;
break;
case 'n':
*lflag &= ~VIEW_FLAGS;
*lflag |= LS_NUMERIC_VIEW|LS_LONG_VIEW;
break;
case 'r':
*lflag |= LS_REVERSE_SORT;
break;
case 't':
*lflag &= ~SORT_FLAGS;
*lflag |= LS_TIME_SORT;
break;
default:
error("ls: Invalid flag -%c", ch);
return -1;
}
}
return optind;
}
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
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("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;
struct stat sb;
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_NOCHECK, 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 (stat(g.gl_pathv[i], &sb) == -1) {
err = -1;
error("stat %s: %s", g.gl_pathv[i], strerror(errno));
continue;
}
if (!S_ISREG(sb.st_mode)) {
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("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");
}
/* 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);
}
/*
* Undo escaping of glob sequences in place. Used to undo extra escaping
* applied in makeargv() when the string is destined for a function that
* does not glob it.
*/
static void
undo_glob_escape(char *s)
{
size_t i, j;
for (i = j = 0;;) {
if (s[i] == '\0') {
s[j] = '\0';
return;
}
if (s[i] != '\\') {
s[j++] = s[i++];
continue;
}
/* s[i] == '\\' */
++i;
switch (s[i]) {
case '?':
case '[':
case '*':
case '\\':
s[j++] = s[i++];
break;
case '\0':
s[j++] = '\\';
s[j] = '\0';
return;
default:
s[j++] = '\\';
s[j++] = s[i++];
break;
}
}
}
/*
* Split a string into an argument vector using sh(1)-style quoting,
* comment and escaping rules, but with some tweaks to handle glob(3)
* wildcards.
* Returns NULL on error or a NULL-terminated array of arguments.
*/
#define MAXARGS 128
#define MAXARGLEN 8192
static char **
makeargv(const char *arg, int *argcp)
{
int argc, quot;
size_t i, j;
static char argvs[MAXARGLEN];
static char *argv[MAXARGS + 1];
enum { MA_START, MA_SQUOTE, MA_DQUOTE, MA_UNQUOTED } state, q;
*argcp = argc = 0;
if (strlen(arg) > sizeof(argvs) - 1) {
args_too_longs:
error("string too long");
return NULL;
}
state = MA_START;
i = j = 0;
for (;;) {
if (isspace(arg[i])) {
if (state == MA_UNQUOTED) {
/* Terminate current argument */
argvs[j++] = '\0';
argc++;
state = MA_START;
} else if (state != MA_START)
argvs[j++] = arg[i];
} else if (arg[i] == '"' || arg[i] == '\'') {
q = arg[i] == '"' ? MA_DQUOTE : MA_SQUOTE;
if (state == MA_START) {
argv[argc] = argvs + j;
state = q;
} else if (state == MA_UNQUOTED)
state = q;
else if (state == q)
state = MA_UNQUOTED;
else
argvs[j++] = arg[i];
} else if (arg[i] == '\\') {
if (state == MA_SQUOTE || state == MA_DQUOTE) {
quot = state == MA_SQUOTE ? '\'' : '"';
/* Unescape quote we are in */
/* XXX support \n and friends? */
if (arg[i + 1] == quot) {
i++;
argvs[j++] = arg[i];
} else if (arg[i + 1] == '?' ||
arg[i + 1] == '[' || arg[i + 1] == '*') {
/*
* Special case for sftp: append
* double-escaped glob sequence -
* glob will undo one level of
* escaping. NB. string can grow here.
*/
if (j >= sizeof(argvs) - 5)
goto args_too_longs;
argvs[j++] = '\\';
argvs[j++] = arg[i++];
argvs[j++] = '\\';
argvs[j++] = arg[i];
} else {
argvs[j++] = arg[i++];
argvs[j++] = arg[i];
}
} else {
if (state == MA_START) {
argv[argc] = argvs + j;
state = MA_UNQUOTED;
}
if (arg[i + 1] == '?' || arg[i + 1] == '[' ||
arg[i + 1] == '*' || arg[i + 1] == '\\') {
/*
* Special case for sftp: append
* escaped glob sequence -
* glob will undo one level of
* escaping.
*/
argvs[j++] = arg[i++];
argvs[j++] = arg[i];
} else {
/* Unescape everything */
/* XXX support \n and friends? */
i++;
argvs[j++] = arg[i];
}
}
} else if (arg[i] == '#') {
if (state == MA_SQUOTE || state == MA_DQUOTE)
argvs[j++] = arg[i];
else
goto string_done;
} else if (arg[i] == '\0') {
if (state == MA_SQUOTE || state == MA_DQUOTE) {
error("Unterminated quoted argument");
return NULL;
}
string_done:
if (state == MA_UNQUOTED) {
argvs[j++] = '\0';
argc++;
}
break;
} else {
if (state == MA_START) {
argv[argc] = argvs + j;
state = MA_UNQUOTED;
}
if ((state == MA_SQUOTE || state == MA_DQUOTE) &&
(arg[i] == '?' || arg[i] == '[' || arg[i] == '*')) {
/*
* Special case for sftp: escape quoted
* glob(3) wildcards. NB. string can grow
* here.
*/
if (j >= sizeof(argvs) - 3)
goto args_too_longs;
argvs[j++] = '\\';
argvs[j++] = arg[i];
} else
argvs[j++] = arg[i];
}
i++;
}
*argcp = argc;
return argv;
}
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, **argv;
int base = 0;
long l;
int i, cmdnum, optidx, argc;
/* 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++;
}
if ((argv = makeargv(cp, &argc)) == NULL)
return -1;
/* Figure out which command we have */
for (i = 0; cmds[i].c != NULL; i++) {
if (strcasecmp(cmds[i].c, argv[0]) == 0)
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;
optidx = 1;
switch (cmdnum) {
case I_GET:
case I_PUT:
if ((optidx = parse_getput_flags(cmd, argv, argc, pflag)) == -1)
return -1;
/* Get first pathname (mandatory) */
if (argc - optidx < 1) {
error("You must specify at least one path after a "
"%s command.", cmd);
return -1;
}
*path1 = xstrdup(argv[optidx]);
/* Get second pathname (optional) */
if (argc - optidx > 1) {
*path2 = xstrdup(argv[optidx + 1]);
/* Destination is not globbed */
undo_glob_escape(*path2);
}
break;
case I_RENAME:
case I_SYMLINK:
if (argc - optidx < 2) {
error("You must specify two paths after a %s "
"command.", cmd);
return -1;
}
*path1 = xstrdup(argv[optidx]);
*path2 = xstrdup(argv[optidx + 1]);
/* Paths are not globbed */
undo_glob_escape(*path1);
undo_glob_escape(*path2);
break;
case I_RM:
case I_MKDIR:
case I_RMDIR:
case I_CHDIR:
case I_LCHDIR:
case I_LMKDIR:
/* Get pathname (mandatory) */
if (argc - optidx < 1) {
error("You must specify a path after a %s command.",
cmd);
return -1;
}
*path1 = xstrdup(argv[optidx]);
/* Only "rm" globs */
if (cmdnum != I_RM)
undo_glob_escape(*path1);
break;
case I_LS:
if ((optidx = parse_ls_flags(argv, argc, lflag)) == -1)
return(-1);
/* Path is optional */
if (argc - optidx > 0)
*path1 = xstrdup(argv[optidx]);
break;
case I_LLS:
/* Skip ls command and following whitespace */
cp = cp + strlen(cmd) + strspn(cp, WHITESPACE);
case I_SHELL:
/* Uses the rest of the line */
break;
case I_LUMASK:
case I_CHMOD:
base = 8;
case I_CHOWN:
case I_CHGRP:
/* Get numeric arg (mandatory) */
if (argc - optidx < 1)
goto need_num_arg;
errno = 0;
l = strtol(argv[optidx], &cp2, base);
if (cp2 == argv[optidx] || *cp2 != '\0' ||
((l == LONG_MIN || l == LONG_MAX) && errno == ERANGE) ||
l < 0) {
need_num_arg:
error("You must supply a numeric argument "
"to the %s command.", cmd);
return -1;
}
*n_arg = l;
if (cmdnum == I_LUMASK)
break;
/* Get pathname (mandatory) */
if (argc - optidx < 2) {
error("You must specify a path after a %s command.",
cmd);
return -1;
}
*path1 = xstrdup(argv[optidx + 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("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("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("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("Changing owner on %s\n", g.gl_pathv[i]);
aa->uid = n_arg;
} else {
printf("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("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("Local working directory: %s\n", path_buf);
break;
case I_QUIT:
/* Processed below */
break;
case I_HELP:
help();
break;
case I_VERSION:
printf("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> ");
}
#endif
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;
EditLine *el = NULL;
#ifdef USE_LIBEDIT
History *hl = NULL;
HistEvent hev;
extern char *__progname;
if (!batchmode && isatty(STDIN_FILENO)) {
if ((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);
}
#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("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 (el == 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");
}
} else {
#ifdef USE_LIBEDIT
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, "Error: input line too long\n");
continue;
}
#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);
#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;
#ifdef USE_PIPES
int pin[2], pout[2];
if ((pipe(pin) == -1) || (pipe(pout) == -1))
fatal("pipe: %s", strerror(errno));
*in = pin[0];
*out = pout[1];
c_in = pout[0];
c_out = pin[1];
#else /* USE_PIPES */
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];
#endif /* USE_PIPES */
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)
{
extern char *__progname;
fprintf(stderr,
"usage: %s [-1Cv] [-B buffer_size] [-b batchfile] [-F ssh_config]\n"
" [-o ssh_option] [-P sftp_server_path] [-R num_requests]\n"
" [-S program] [-s subsystem | sftp_server] host\n"
" %s [[user@]host[:file [file]]]\n"
" %s [[user@]host[:dir[/]]]\n"
" %s -b batchfile [user@]host\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 = ssh_get_progname(argv[0]);
memset(&args, '\0', sizeof(args));
args.list = NULL;
addargs(&args, "%s", ssh_program);
addargs(&args, "-oForwardX11 no");
addargs(&args, "-oForwardAgent no");
addargs(&args, "-oPermitLocalCommand 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, "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, "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, "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, "Attaching to %s...\n", sftp_direct);
connect_to_server(sftp_direct, args.list, &in, &out);
}
freeargs(&args);
err = interactive_loop(in, out, file1, file2);
#if !defined(USE_PIPES)
shutdown(in, SHUT_RDWR);
shutdown(out, SHUT_RDWR);
#endif
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));
exit(err == 0 ? 0 : 1);
}
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