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openssh/sftp-int.c

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/*
* Copyright (c) 2001 Damien Miller. 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.
*/
/* XXX: finish implementation of all commands */
/* XXX: do fnmatch() instead of using raw pathname */
/* XXX: globbed ls */
/* XXX: recursive operations */
#include "includes.h"
RCSID("$OpenBSD: sftp-int.c,v 1.23 2001/03/01 02:18:04 deraadt Exp $");
#include "buffer.h"
#include "xmalloc.h"
#include "log.h"
#include "pathnames.h"
#include "sftp.h"
#include "sftp-common.h"
#include "sftp-client.h"
#include "sftp-int.h"
/* Seperators for interactive commands */
#define WHITESPACE " \t\r\n"
/* 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
struct CMD {
const char *c;
const int n;
};
const struct CMD cmds[] = {
{ "cd", I_CHDIR },
{ "chdir", I_CHDIR },
{ "chgrp", I_CHGRP },
{ "chmod", I_CHMOD },
{ "chown", I_CHOWN },
{ "dir", I_LS },
{ "exit", I_QUIT },
{ "get", I_GET },
{ "help", I_HELP },
{ "lcd", I_LCHDIR },
{ "lchdir", I_LCHDIR },
{ "lls", I_LLS },
{ "lmkdir", I_LMKDIR },
{ "lpwd", I_LPWD },
{ "ls", I_LS },
{ "lumask", I_LUMASK },
{ "mkdir", I_MKDIR },
{ "put", I_PUT },
{ "pwd", I_PWD },
{ "quit", I_QUIT },
{ "rename", I_RENAME },
{ "rm", I_RM },
{ "rmdir", I_RMDIR },
{ "!", I_SHELL },
{ "?", I_HELP },
{ NULL, -1}
};
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("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("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("!command Execute 'command' in local shell\n");
printf("! Escape to local shell\n");
printf("? Synonym for help\n");
}
void
local_do_shell(const char *args)
{
int ret, 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);
ret = execl(shell, shell, "-c", args, NULL);
} else {
debug3("Executing %s", shell);
ret = execl(shell, shell, NULL);
}
fprintf(stderr, "Couldn't execute \"%s\": %s\n", shell,
strerror(errno));
_exit(1);
}
if (waitpid(pid, &status, 0) == -1)
fatal("Couldn't wait for child: %s", strerror(errno));
if (!WIFEXITED(status))
error("Shell exited abormally");
else if (WEXITSTATUS(status))
error("Shell exited with status %d", WEXITSTATUS(status));
}
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);
}
}
char *
make_absolute(char *p, char *pwd)
{
char buf[2048];
/* Derelativise */
if (p && p[0] != '/') {
snprintf(buf, sizeof(buf), "%s/%s", pwd, p);
xfree(p);
p = xstrdup(buf);
}
return(p);
}
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);
}
int
get_pathname(const char **cpp, char **path)
{
const char *cp = *cpp, *end;
char quot;
int i;
cp += strspn(cp, WHITESPACE);
if (!*cp) {
*cpp = cp;
*path = NULL;
return (0);
}
/* Check for quoted filenames */
if (*cp == '\"' || *cp == '\'') {
quot = *cp++;
end = strchr(cp, quot);
if (end == NULL) {
error("Unterminated quote");
goto fail;
}
if (cp == end) {
error("Empty quotes");
goto fail;
}
*cpp = end + 1 + strspn(end + 1, WHITESPACE);
} else {
/* Read to end of filename */
end = strpbrk(cp, WHITESPACE);
if (end == NULL)
end = strchr(cp, '\0');
*cpp = end + strspn(end, WHITESPACE);
}
i = end - cp;
*path = xmalloc(i + 1);
memcpy(*path, cp, i);
(*path)[i] = '\0';
return(0);
fail:
*path = NULL;
return (-1);
}
int
infer_path(const char *p, char **ifp)
{
char *cp;
debug("XXX: P = \"%s\"", p);
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);
}
int
parse_args(const char **cpp, int *pflag, 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 */
if (!*cp)
return(-1);
/* 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 */
*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);
/* Otherwise try to guess it from first path */
if (*path2 == NULL && infer_path(*path1, path2))
return(-1);
break;
case I_RENAME:
/* Get first pathname (mandatory) */
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:
/* 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;
case I_CHMOD:
base = 8;
case I_CHOWN:
case I_CHGRP:
/* Get numeric arg (mandatory) */
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:
break;
default:
fatal("Command not implemented");
}
*cpp = cp;
return(cmdnum);
}
int
parse_dispatch_command(int in, int out, const char *cmd, char **pwd)
{
char *path1, *path2, *tmp;
int pflag, cmdnum;
unsigned long n_arg;
Attrib a, *aa;
char path_buf[MAXPATHLEN];
path1 = path2 = NULL;
cmdnum = parse_args(&cmd, &pflag, &n_arg, &path1, &path2);
/* Perform command */
switch (cmdnum) {
case -1:
break;
case I_GET:
path1 = make_absolute(path1, *pwd);
do_download(in, out, path1, path2, pflag);
break;
case I_PUT:
path2 = make_absolute(path2, *pwd);
do_upload(in, out, path1, path2, pflag);
break;
case I_RENAME:
path1 = make_absolute(path1, *pwd);
path2 = make_absolute(path2, *pwd);
do_rename(in, out, path1, path2);
break;
case I_RM:
path1 = make_absolute(path1, *pwd);
do_rm(in, out, path1);
break;
case I_MKDIR:
path1 = make_absolute(path1, *pwd);
attrib_clear(&a);
a.flags |= SSH2_FILEXFER_ATTR_PERMISSIONS;
a.perm = 0777;
do_mkdir(in, out, path1, &a);
break;
case I_RMDIR:
path1 = make_absolute(path1, *pwd);
do_rmdir(in, out, path1);
break;
case I_CHDIR:
path1 = make_absolute(path1, *pwd);
if ((tmp = do_realpath(in, out, path1)) == NULL)
break;
if ((aa = do_stat(in, out, tmp)) == NULL) {
xfree(tmp);
break;
}
if (!(aa->flags & SSH2_FILEXFER_ATTR_PERMISSIONS)) {
error("Can't change directory: Can't check target");
xfree(tmp);
break;
}
if (!S_ISDIR(aa->perm)) {
error("Can't change directory: \"%s\" is not "
"a directory", tmp);
xfree(tmp);
break;
}
xfree(*pwd);
*pwd = tmp;
break;
case I_LS:
if (!path1) {
do_ls(in, out, *pwd);
break;
}
path1 = make_absolute(path1, *pwd);
if ((tmp = do_realpath(in, out, path1)) == NULL)
break;
xfree(path1);
path1 = tmp;
if ((aa = do_stat(in, out, path1)) == NULL)
break;
if ((aa->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) &&
!S_ISDIR(aa->perm)) {
error("Can't ls: \"%s\" is not a directory", path1);
break;
}
do_ls(in, out, path1);
break;
case I_LCHDIR:
if (chdir(path1) == -1)
error("Couldn't change local directory to "
"\"%s\": %s", path1, strerror(errno));
break;
case I_LMKDIR:
if (mkdir(path1, 0777) == -1)
error("Couldn't create local directory "
"\"%s\": %s", path1, strerror(errno));
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;
do_setstat(in, out, path1, &a);
break;
case I_CHOWN:
path1 = make_absolute(path1, *pwd);
if (!(aa = do_stat(in, out, path1)))
break;
if (!(aa->flags & SSH2_FILEXFER_ATTR_UIDGID)) {
error("Can't get current ownership of "
"remote file \"%s\"", path1);
break;
}
aa->flags &= SSH2_FILEXFER_ATTR_UIDGID;
aa->uid = n_arg;
do_setstat(in, out, path1, aa);
break;
case I_CHGRP:
path1 = make_absolute(path1, *pwd);
if (!(aa = do_stat(in, out, path1)))
break;
if (!(aa->flags & SSH2_FILEXFER_ATTR_UIDGID)) {
error("Can't get current ownership of "
"remote file \"%s\"", path1);
break;
}
aa->flags &= SSH2_FILEXFER_ATTR_UIDGID;
aa->gid = n_arg;
do_setstat(in, out, path1, aa);
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\n",
strerror(errno));
else
printf("Local working directory: %s\n",
path_buf);
break;
case I_QUIT:
return(-1);
case I_HELP:
help();
break;
default:
fatal("%d is not implemented", cmdnum);
}
if (path1)
xfree(path1);
if (path2)
xfree(path2);
return(0);
}
void
interactive_loop(int fd_in, int fd_out)
{
char *pwd;
char cmd[2048];
pwd = do_realpath(fd_in, fd_out, ".");
if (pwd == NULL)
fatal("Need cwd");
setvbuf(stdout, NULL, _IOLBF, 0);
setvbuf(stdin, NULL, _IOLBF, 0);
for(;;) {
char *cp;
printf("sftp> ");
/* XXX: use libedit */
if (fgets(cmd, sizeof(cmd), stdin) == NULL) {
printf("\n");
break;
}
cp = strrchr(cmd, '\n');
if (cp)
*cp = '\0';
if (parse_dispatch_command(fd_in, fd_out, cmd, &pwd))
break;
}
xfree(pwd);
}
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