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/*
* Part of Very Secure FTPd
* Licence: GPL v2
* Author: Chris Evans
* ftpcmdio.c
*
* Routines applicable to reading and writing the FTP command stream.
*/
#include "ftpcmdio.h"
#include "ftpcodes.h"
#include "str.h"
#include "netstr.h"
#include "sysutil.h"
#include "tunables.h"
#include "defs.h"
#include "secbuf.h"
#include "utility.h"
#include "logging.h"
#include "session.h"
#include "readwrite.h"
/* Internal functions */
static int control_getline(struct mystr* p_str, struct vsf_session* p_sess);
static void ftp_write_text_common(struct vsf_session* p_sess, int status,
const char* p_text, char sep);
static void ftp_write_str_common(struct vsf_session* p_sess, int status,
char sep, const struct mystr* p_str);
static void handle_alarm_timeout(void* p_private);
void
vsf_cmdio_sock_setup(void)
{
vsf_sysutil_activate_keepalive(VSFTP_COMMAND_FD);
vsf_sysutil_set_nodelay(VSFTP_COMMAND_FD);
vsf_sysutil_activate_oobinline(VSFTP_COMMAND_FD);
}
static void
handle_alarm_timeout(void* p_private)
{
struct vsf_session* p_sess = (struct vsf_session*) p_private;
p_sess->idle_timeout = 1;
vsf_sysutil_activate_noblock(VSFTP_COMMAND_FD);
vsf_sysutil_shutdown_read_failok(VSFTP_COMMAND_FD);
}
void
vsf_cmdio_write(struct vsf_session* p_sess, int status, const char* p_text)
{
ftp_write_text_common(p_sess, status, p_text, ' ');
}
void
vsf_cmdio_write_hyphen(struct vsf_session* p_sess, int status,
const char* p_text)
{
ftp_write_text_common(p_sess, status, p_text, '-');
}
void
vsf_cmdio_write_raw(struct vsf_session* p_sess, const char* p_text)
{
static struct mystr s_the_str;
int retval;
str_alloc_text(&s_the_str, p_text);
if (tunable_log_ftp_protocol)
{
vsf_log_line(p_sess, kVSFLogEntryFTPOutput, &s_the_str);
}
retval = ftp_write_str(p_sess, &s_the_str, kVSFRWControl);
if (retval != 0)
{
die("ftp_write_str");
}
}
void
vsf_cmdio_write_exit(struct vsf_session* p_sess, int status, const char* p_text,
int exit_val)
{
/* Unblock any readers on the dying control channel. This is needed for SSL
* connections, where the SSL control channel slave is in a separate
* process.
*/
vsf_sysutil_activate_noblock(VSFTP_COMMAND_FD);
vsf_sysutil_shutdown_read_failok(VSFTP_COMMAND_FD);
vsf_cmdio_write(p_sess, status, p_text);
vsf_sysutil_shutdown_failok(VSFTP_COMMAND_FD);
vsf_sysutil_exit(exit_val);
}
static void
ftp_write_text_common(struct vsf_session* p_sess, int status,
const char* p_text, char sep)
{
/* XXX - could optimize */
static struct mystr s_the_str;
str_alloc_text(&s_the_str, p_text);
ftp_write_str_common(p_sess, status, sep, &s_the_str);
}
void
vsf_cmdio_write_str_hyphen(struct vsf_session* p_sess, int status,
const struct mystr* p_str)
{
ftp_write_str_common(p_sess, status, '-', p_str);
}
void
vsf_cmdio_write_str(struct vsf_session* p_sess, int status,
const struct mystr* p_str)
{
ftp_write_str_common(p_sess, status, ' ', p_str);
}
static void
ftp_write_str_common(struct vsf_session* p_sess, int status, char sep,
const struct mystr* p_str)
{
static struct mystr s_write_buf_str;
static struct mystr s_text_mangle_str;
int retval;
if (tunable_log_ftp_protocol)
{
str_alloc_ulong(&s_write_buf_str, (unsigned long) status);
str_append_char(&s_write_buf_str, sep);
str_append_str(&s_write_buf_str, p_str);
vsf_log_line(p_sess, kVSFLogEntryFTPOutput, &s_write_buf_str);
}
str_copy(&s_text_mangle_str, p_str);
/* Process the output response according to the specifications.. */
/* Escape telnet characters properly */
str_replace_text(&s_text_mangle_str, "\377", "\377\377");
/* Change \n for \0 in response */
str_replace_char(&s_text_mangle_str, '\n', '\0');
/* Build string to squirt down network */
str_alloc_ulong(&s_write_buf_str, (unsigned long) status);
str_append_char(&s_write_buf_str, sep);
str_append_str(&s_write_buf_str, &s_text_mangle_str);
str_append_text(&s_write_buf_str, "\r\n");
retval = ftp_write_str(p_sess, &s_write_buf_str, kVSFRWControl);
if (retval != 0)
{
die("ftp_write");
}
}
void
vsf_cmdio_set_alarm(struct vsf_session* p_sess)
{
if (tunable_idle_session_timeout > 0)
{
vsf_sysutil_install_sighandler(kVSFSysUtilSigALRM,
handle_alarm_timeout,
p_sess,
1);
vsf_sysutil_set_alarm(tunable_idle_session_timeout);
}
}
void
vsf_cmdio_get_cmd_and_arg(struct vsf_session* p_sess, struct mystr* p_cmd_str,
struct mystr* p_arg_str, int set_alarm)
{
int ret;
/* Prepare an alarm to timeout the session.. */
if (set_alarm)
{
vsf_cmdio_set_alarm(p_sess);
}
/* Blocks */
ret = control_getline(p_cmd_str, p_sess);
if (p_sess->idle_timeout)
{
vsf_cmdio_write_exit(p_sess, FTP_IDLE_TIMEOUT, "Timeout.", 1);
}
if (ret == 0)
{
/* Remote end hung up without a polite QUIT. The shutdown is to make
* sure buggy clients don't ever see an OOPS message.
*/
vsf_sysutil_shutdown_failok(VSFTP_COMMAND_FD);
vsf_sysutil_exit(1);
}
/* View a single space as a command of " ", which although a useless command,
* permits the caller to distinguish input of "" from " ".
*/
if (str_getlen(p_cmd_str) == 1 && str_get_char_at(p_cmd_str, 0) == ' ')
{
str_empty(p_arg_str);
}
else
{
str_split_char(p_cmd_str, p_arg_str, ' ');
}
str_upper(p_cmd_str);
if (tunable_log_ftp_protocol)
{
static struct mystr s_log_str;
if (str_equal_text(p_cmd_str, "PASS"))
{
str_alloc_text(&s_log_str, "PASS <password>");
}
else
{
str_copy(&s_log_str, p_cmd_str);
if (!str_isempty(p_arg_str))
{
str_append_char(&s_log_str, ' ');
str_append_str(&s_log_str, p_arg_str);
}
}
vsf_log_line(p_sess, kVSFLogEntryFTPInput, &s_log_str);
}
}
static int
control_getline(struct mystr* p_str, struct vsf_session* p_sess)
{
int ret;
if (p_sess->p_control_line_buf == 0)
{
vsf_secbuf_alloc(&p_sess->p_control_line_buf, VSFTP_MAX_COMMAND_LINE);
}
ret = ftp_getline(p_sess, p_str, p_sess->p_control_line_buf);
if (ret == 0)
{
return ret;
}
else if (ret < 0)
{
vsf_cmdio_write_exit(p_sess, FTP_BADCMD, "Input line too long.", 1);
}
/* As mandated by the FTP specifications.. */
str_replace_char(p_str, '\0', '\n');
/* If the last character is a \r, strip it */
{
unsigned int len = str_getlen(p_str);
while (len > 0 && str_get_char_at(p_str, len - 1) == '\r')
{
str_trunc(p_str, len - 1);
--len;
}
}
return 1;
}
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