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ftpcmd.y
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/*
* Copyright (c) 1985, 1988, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)ftpcmd.y 8.3 (Berkeley) 4/6/94
*/
/*
* Grammar for FTP commands.
* See RFC 959.
*/
%{
#ifndef lint
#if 0
static char sccsid[] = "@(#)ftpcmd.y 8.3 (Berkeley) 4/6/94";
#endif
#endif /* not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <netinet/in.h>
#include <arpa/ftp.h>
#include <ctype.h>
#include <errno.h>
#include <glob.h>
#include <libutil.h>
#include <limits.h>
#include <md5.h>
#include <netdb.h>
#include <pwd.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <time.h>
#include <unistd.h>
#include "extern.h"
#include "pathnames.h"
off_t restart_point;
static int cmd_type;
static int cmd_form;
static int cmd_bytesz;
static int state;
char cbuf[512];
char *fromname = NULL;
%}
%union {
struct {
off_t o;
int i;
} u;
char *s;
}
%token
A B C E F I
L N P R S T
ALL
SP CRLF COMMA
USER PASS ACCT REIN QUIT PORT
PASV TYPE STRU MODE RETR STOR
APPE MLFL MAIL MSND MSOM MSAM
MRSQ MRCP ALLO REST RNFR RNTO
ABOR DELE CWD LIST NLST SITE
STAT HELP NOOP MKD RMD PWD
CDUP STOU SMNT SYST SIZE MDTM
LPRT LPSV EPRT EPSV FEAT
UMASK IDLE CHMOD MDFIVE
LEXERR NOTIMPL
%token <s> STRING
%token <u> NUMBER
%type <u.i> check_login octal_number byte_size
%type <u.i> check_login_ro check_login_epsv
%type <u.i> struct_code mode_code type_code form_code
%type <s> pathstring pathname password username
%type <s> ALL NOTIMPL
%start cmd_list
%%
cmd_list
: /* empty */
| cmd_list cmd
{
if (fromname)
free(fromname);
fromname = NULL;
restart_point = 0;
}
| cmd_list rcmd
;
cmd
: USER SP username CRLF
{
user($3);
free($3);
}
| PASS SP password CRLF
{
pass($3);
free($3);
}
| PASS CRLF
{
pass("");
}
| PORT check_login SP host_port CRLF
{
if (epsvall) {
reply(501, "No PORT allowed after EPSV ALL.");
goto port_done;
}
if (!$2)
goto port_done;
if (port_check("PORT") == 1)
goto port_done;
#ifdef INET6
if ((his_addr.su_family != AF_INET6 ||
!IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr))) {
/* shoud never happen */
usedefault = 1;
reply(500, "Invalid address rejected.");
goto port_done;
}
port_check_v6("pcmd");
#endif
port_done:
;
}
| LPRT check_login SP host_long_port CRLF
{
if (epsvall) {
reply(501, "No LPRT allowed after EPSV ALL.");
goto lprt_done;
}
if (!$2)
goto lprt_done;
if (port_check("LPRT") == 1)
goto lprt_done;
#ifdef INET6
if (his_addr.su_family != AF_INET6) {
usedefault = 1;
reply(500, "Invalid address rejected.");
goto lprt_done;
}
if (port_check_v6("LPRT") == 1)
goto lprt_done;
#endif
lprt_done:
;
}
| EPRT check_login SP STRING CRLF
{
char delim;
char *tmp = NULL;
char *p, *q;
char *result[3];
struct addrinfo hints;
struct addrinfo *res;
int i;
if (epsvall) {
reply(501, "No EPRT allowed after EPSV ALL.");
goto eprt_done;
}
if (!$2)
goto eprt_done;
memset(&data_dest, 0, sizeof(data_dest));
tmp = strdup($4);
if (ftpdebug)
syslog(LOG_DEBUG, "%s", tmp);
if (!tmp) {
fatalerror("not enough core");
/*NOTREACHED*/
}
p = tmp;
delim = p[0];
p++;
memset(result, 0, sizeof(result));
for (i = 0; i < 3; i++) {
q = strchr(p, delim);
if (!q || *q != delim) {
parsefail:
reply(500,
"Invalid argument, rejected.");
if (tmp)
free(tmp);
usedefault = 1;
goto eprt_done;
}
*q++ = '\0';
result[i] = p;
if (ftpdebug)
syslog(LOG_DEBUG, "%d: %s", i, p);
p = q;
}
/* some more sanity check */
p = result[0];
while (*p) {
if (!isdigit(*p))
goto parsefail;
p++;
}
p = result[2];
while (*p) {
if (!isdigit(*p))
goto parsefail;
p++;
}
/* grab address */
memset(&hints, 0, sizeof(hints));
if (atoi(result[0]) == 1)
hints.ai_family = PF_INET;
#ifdef INET6
else if (atoi(result[0]) == 2)
hints.ai_family = PF_INET6;
#endif
else
hints.ai_family = PF_UNSPEC; /*XXX*/
hints.ai_socktype = SOCK_STREAM;
i = getaddrinfo(result[1], result[2], &hints, &res);
if (i)
goto parsefail;
memcpy(&data_dest, res->ai_addr, res->ai_addrlen);
#ifdef INET6
if (his_addr.su_family == AF_INET6
&& data_dest.su_family == AF_INET6) {
/* XXX more sanity checks! */
data_dest.su_sin6.sin6_scope_id =
his_addr.su_sin6.sin6_scope_id;
}
#endif
free(tmp);
tmp = NULL;
if (port_check("EPRT") == 1)
goto eprt_done;
#ifdef INET6
if (his_addr.su_family != AF_INET6) {
usedefault = 1;
reply(500, "Invalid address rejected.");
goto eprt_done;
}
if (port_check_v6("EPRT") == 1)
goto eprt_done;
#endif
eprt_done:
free($4);
}
| PASV check_login CRLF
{
if (epsvall)
reply(501, "No PASV allowed after EPSV ALL.");
else if ($2)
passive();
}
| LPSV check_login CRLF
{
if (epsvall)
reply(501, "No LPSV allowed after EPSV ALL.");
else if ($2)
long_passive("LPSV", PF_UNSPEC);
}
| EPSV check_login_epsv SP NUMBER CRLF
{
if ($2) {
int pf;
switch ($4.i) {
case 1:
pf = PF_INET;
break;
#ifdef INET6
case 2:
pf = PF_INET6;
break;
#endif
default:
pf = -1; /*junk value*/
break;
}
long_passive("EPSV", pf);
}
}
| EPSV check_login_epsv SP ALL CRLF
{
if ($2) {
reply(200, "EPSV ALL command successful.");
epsvall++;
}
}
| EPSV check_login_epsv CRLF
{
if ($2)
long_passive("EPSV", PF_UNSPEC);
}
| TYPE check_login SP type_code CRLF
{
if ($2) {
switch (cmd_type) {
case TYPE_A:
if (cmd_form == FORM_N) {
reply(200, "Type set to A.");
type = cmd_type;
form = cmd_form;
} else
reply(504, "Form must be N.");
break;
case TYPE_E:
reply(504, "Type E not implemented.");
break;
case TYPE_I:
reply(200, "Type set to I.");
type = cmd_type;
break;
case TYPE_L:
#if CHAR_BIT == 8
if (cmd_bytesz == 8) {
reply(200,
"Type set to L (byte size 8).");
type = cmd_type;
} else
reply(504, "Byte size must be 8.");
#else /* CHAR_BIT == 8 */
UNIMPLEMENTED for CHAR_BIT != 8
#endif /* CHAR_BIT == 8 */
}
}
}
| STRU check_login SP struct_code CRLF
{
if ($2) {
switch ($4) {
case STRU_F:
reply(200, "STRU F accepted.");
break;
default:
reply(504, "Unimplemented STRU type.");
}
}
}
| MODE check_login SP mode_code CRLF
{
if ($2) {
switch ($4) {
case MODE_S:
reply(200, "MODE S accepted.");
break;
default:
reply(502, "Unimplemented MODE type.");
}
}
}
| ALLO check_login SP NUMBER CRLF
{
if ($2) {
reply(202, "ALLO command ignored.");
}
}
| ALLO check_login SP NUMBER SP R SP NUMBER CRLF
{
if ($2) {
reply(202, "ALLO command ignored.");
}
}
| RETR check_login SP pathname CRLF
{
if (noretr || (guest && noguestretr))
reply(500, "RETR command disabled.");
else if ($2 && $4 != NULL)
retrieve(NULL, $4);
if ($4 != NULL)
free($4);
}
| STOR check_login_ro SP pathname CRLF
{
if ($2 && $4 != NULL)
store($4, "w", 0);
if ($4 != NULL)
free($4);
}
| APPE check_login_ro SP pathname CRLF
{
if ($2 && $4 != NULL)
store($4, "a", 0);
if ($4 != NULL)
free($4);
}
| NLST check_login CRLF
{
if ($2)
send_file_list(".");
}
| NLST check_login SP pathstring CRLF
{
if ($2)
send_file_list($4);
free($4);
}
| LIST check_login CRLF
{
if ($2)
retrieve(_PATH_LS " -lgA", "");
}
| LIST check_login SP pathstring CRLF
{
if ($2)
retrieve(_PATH_LS " -lgA %s", $4);
free($4);
}
| STAT check_login SP pathname CRLF
{
if ($2 && $4 != NULL)
statfilecmd($4);
if ($4 != NULL)
free($4);
}
| STAT check_login CRLF
{
if ($2) {
statcmd();
}
}
| DELE check_login_ro SP pathname CRLF
{
if ($2 && $4 != NULL)
delete($4);
if ($4 != NULL)
free($4);
}
| RNTO check_login_ro SP pathname CRLF
{
if ($2 && $4 != NULL) {
if (fromname) {
renamecmd(fromname, $4);
free(fromname);
fromname = NULL;
} else {
reply(503, "Bad sequence of commands.");
}
}
if ($4 != NULL)
free($4);
}
| ABOR check_login CRLF
{
if ($2)
reply(225, "ABOR command successful.");
}
| CWD check_login CRLF
{
if ($2) {
cwd(homedir);
}
}
| CWD check_login SP pathname CRLF
{
if ($2 && $4 != NULL)
cwd($4);
if ($4 != NULL)
free($4);
}
| HELP CRLF
{
help(cmdtab, NULL);
}
| HELP SP STRING CRLF
{
char *cp = $3;
if (strncasecmp(cp, "SITE", 4) == 0) {
cp = $3 + 4;
if (*cp == ' ')
cp++;
if (*cp)
help(sitetab, cp);
else
help(sitetab, NULL);
} else
help(cmdtab, $3);
free($3);
}
| NOOP CRLF
{
reply(200, "NOOP command successful.");
}
| MKD check_login_ro SP pathname CRLF
{
if ($2 && $4 != NULL)
makedir($4);
if ($4 != NULL)
free($4);
}
| RMD check_login_ro SP pathname CRLF
{
if ($2 && $4 != NULL)
removedir($4);
if ($4 != NULL)
free($4);
}
| PWD check_login CRLF
{
if ($2)
pwd();
}
| CDUP check_login CRLF
{
if ($2)
cwd("..");
}
| SITE SP HELP CRLF
{
help(sitetab, NULL);
}
| SITE SP HELP SP STRING CRLF
{
help(sitetab, $5);
free($5);
}
| SITE SP MDFIVE check_login SP pathname CRLF
{
char p[64], *q;
if ($4 && $6) {
q = MD5File($6, p);
if (q != NULL)
reply(200, "MD5(%s) = %s", $6, p);
else
perror_reply(550, $6);
}
if ($6)
free($6);
}
| SITE SP UMASK check_login CRLF
{
int oldmask;
if ($4) {
oldmask = umask(0);
(void) umask(oldmask);
reply(200, "Current UMASK is %03o.", oldmask);
}
}
| SITE SP UMASK check_login SP octal_number CRLF
{
int oldmask;
if ($4) {
if (($6 == -1) || ($6 > 0777)) {
reply(501, "Bad UMASK value.");
} else {
oldmask = umask($6);
reply(200,
"UMASK set to %03o (was %03o).",
$6, oldmask);
}
}
}
| SITE SP CHMOD check_login_ro SP octal_number SP pathname CRLF
{
if ($4 && ($8 != NULL)) {
if (($6 == -1 ) || ($6 > 0777))
reply(501, "Bad mode value.");
else if (chmod($8, $6) < 0)
perror_reply(550, $8);
else
reply(200, "CHMOD command successful.");
}
if ($8 != NULL)
free($8);
}
| SITE SP check_login IDLE CRLF
{
if ($3)
reply(200,
"Current IDLE time limit is %d seconds; max %d.",
timeout, maxtimeout);
}
| SITE SP check_login IDLE SP NUMBER CRLF
{
if ($3) {
if ($6.i < 30 || $6.i > maxtimeout) {
reply(501,
"Maximum IDLE time must be between 30 and %d seconds.",
maxtimeout);
} else {
timeout = $6.i;
(void) alarm(timeout);
reply(200,
"Maximum IDLE time set to %d seconds.",
timeout);
}
}
}
| STOU check_login_ro SP pathname CRLF
{
if ($2 && $4 != NULL)
store($4, "w", 1);
if ($4 != NULL)
free($4);
}
| FEAT CRLF
{
lreply(211, "Extensions supported:");
#if 0
/* XXX these two keywords are non-standard */
printf(" EPRT\r\n");
if (!noepsv)
printf(" EPSV\r\n");
#endif
printf(" MDTM\r\n");
printf(" REST STREAM\r\n");
printf(" SIZE\r\n");
if (assumeutf8) {
/* TVFS requires UTF8, see RFC 3659 */
printf(" TVFS\r\n");
printf(" UTF8\r\n");
}
reply(211, "End.");
}
| SYST check_login CRLF
{
if ($2) {
if (hostinfo)
#ifdef BSD
reply(215, "UNIX Type: L%d Version: BSD-%d",
CHAR_BIT, BSD);
#else /* BSD */
reply(215, "UNIX Type: L%d", CHAR_BIT);
#endif /* BSD */
else
reply(215, "UNKNOWN Type: L%d", CHAR_BIT);
}
}
/*
* SIZE is not in RFC959, but Postel has blessed it and
* it will be in the updated RFC.
*
* Return size of file in a format suitable for
* using with RESTART (we just count bytes).
*/
| SIZE check_login SP pathname CRLF
{
if ($2 && $4 != NULL)
sizecmd($4);
if ($4 != NULL)
free($4);
}
/*
* MDTM is not in RFC959, but Postel has blessed it and
* it will be in the updated RFC.
*
* Return modification time of file as an ISO 3307
* style time. E.g. YYYYMMDDHHMMSS or YYYYMMDDHHMMSS.xxx
* where xxx is the fractional second (of any precision,
* not necessarily 3 digits)
*/
| MDTM check_login SP pathname CRLF
{
if ($2 && $4 != NULL) {
struct stat stbuf;
if (stat($4, &stbuf) < 0)
perror_reply(550, $4);
else if (!S_ISREG(stbuf.st_mode)) {
reply(550, "%s: not a plain file.", $4);
} else {
struct tm *t;
t = gmtime(&stbuf.st_mtime);
reply(213,
"%04d%02d%02d%02d%02d%02d",
1900 + t->tm_year,
t->tm_mon+1, t->tm_mday,
t->tm_hour, t->tm_min, t->tm_sec);
}
}
if ($4 != NULL)
free($4);
}
| QUIT CRLF
{
reply(221, "Goodbye.");
dologout(0);
}
| NOTIMPL
{
nack($1);
}
| error
{
yyclearin; /* discard lookahead data */
yyerrok; /* clear error condition */
state = CMD; /* reset lexer state */
}
;
rcmd
: RNFR check_login_ro SP pathname CRLF
{
restart_point = 0;
if ($2 && $4) {
if (fromname)
free(fromname);
fromname = NULL;
if (renamefrom($4))
fromname = $4;
else
free($4);
} else if ($4) {
free($4);
}
}
| REST check_login SP NUMBER CRLF
{
if ($2) {
if (fromname)
free(fromname);
fromname = NULL;
restart_point = $4.o;
reply(350, "Restarting at %jd. %s",
(intmax_t)restart_point,
"Send STORE or RETRIEVE to initiate transfer.");
}
}
;
username
: STRING
;
password
: /* empty */
{
$$ = (char *)calloc(1, sizeof(char));
}
| STRING
;
byte_size
: NUMBER
{
$$ = $1.i;
}
;
host_port
: NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA
NUMBER COMMA NUMBER
{
char *a, *p;
data_dest.su_len = sizeof(struct sockaddr_in);
data_dest.su_family = AF_INET;
p = (char *)&data_dest.su_sin.sin_port;
p[0] = $9.i; p[1] = $11.i;
a = (char *)&data_dest.su_sin.sin_addr;
a[0] = $1.i; a[1] = $3.i; a[2] = $5.i; a[3] = $7.i;
}
;
host_long_port
: NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA
NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA
NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA
NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA
NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA
NUMBER
{
char *a, *p;
memset(&data_dest, 0, sizeof(data_dest));
data_dest.su_len = sizeof(struct sockaddr_in6);
data_dest.su_family = AF_INET6;
p = (char *)&data_dest.su_port;
p[0] = $39.i; p[1] = $41.i;
a = (char *)&data_dest.su_sin6.sin6_addr;
a[0] = $5.i; a[1] = $7.i; a[2] = $9.i; a[3] = $11.i;
a[4] = $13.i; a[5] = $15.i; a[6] = $17.i; a[7] = $19.i;
a[8] = $21.i; a[9] = $23.i; a[10] = $25.i; a[11] = $27.i;
a[12] = $29.i; a[13] = $31.i; a[14] = $33.i; a[15] = $35.i;
if (his_addr.su_family == AF_INET6) {
/* XXX more sanity checks! */
data_dest.su_sin6.sin6_scope_id =
his_addr.su_sin6.sin6_scope_id;
}
if ($1.i != 6 || $3.i != 16 || $37.i != 2)
memset(&data_dest, 0, sizeof(data_dest));
}
| NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA
NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA
NUMBER
{
char *a, *p;
memset(&data_dest, 0, sizeof(data_dest));
data_dest.su_sin.sin_len = sizeof(struct sockaddr_in);
data_dest.su_family = AF_INET;
p = (char *)&data_dest.su_port;
p[0] = $15.i; p[1] = $17.i;
a = (char *)&data_dest.su_sin.sin_addr;
a[0] = $5.i; a[1] = $7.i; a[2] = $9.i; a[3] = $11.i;
if ($1.i != 4 || $3.i != 4 || $13.i != 2)
memset(&data_dest, 0, sizeof(data_dest));
}
;
form_code
: N
{
$$ = FORM_N;
}
| T
{
$$ = FORM_T;
}
| C
{
$$ = FORM_C;
}
;
type_code
: A
{
cmd_type = TYPE_A;
cmd_form = FORM_N;
}
| A SP form_code
{
cmd_type = TYPE_A;
cmd_form = $3;
}
| E
{
cmd_type = TYPE_E;
cmd_form = FORM_N;
}
| E SP form_code
{
cmd_type = TYPE_E;
cmd_form = $3;
}
| I
{
cmd_type = TYPE_I;
}
| L
{
cmd_type = TYPE_L;
cmd_bytesz = CHAR_BIT;
}
| L SP byte_size
{
cmd_type = TYPE_L;
cmd_bytesz = $3;
}
/* this is for a bug in the BBN ftp */
| L byte_size
{
cmd_type = TYPE_L;
cmd_bytesz = $2;
}
;
struct_code
: F
{
$$ = STRU_F;
}
| R
{
$$ = STRU_R;
}
| P
{
$$ = STRU_P;
}
;
mode_code
: S
{
$$ = MODE_S;
}
| B
{
$$ = MODE_B;
}
| C
{
$$ = MODE_C;
}
;
pathname
: pathstring
{
if (logged_in && $1) {
char *p;
/*
* Expand ~user manually since glob(3)
* will return the unexpanded pathname
* if the corresponding file/directory
* doesn't exist yet. Using sole glob(3)
* would break natural commands like
* MKD ~user/newdir
* or
* RNTO ~/newfile
*/
if ((p = exptilde($1)) != NULL) {
$$ = expglob(p);
free(p);
} else
$$ = NULL;
free($1);
} else
$$ = $1;
}
;
pathstring
: STRING
;
octal_number
: NUMBER
{
int ret, dec, multby, digit;
/*
* Convert a number that was read as decimal number
* to what it would be if it had been read as octal.
*/
dec = $1.i;
multby = 1;
ret = 0;
while (dec) {
digit = dec%10;
if (digit > 7) {
ret = -1;
break;