1804 lines
36 KiB
Plaintext
1804 lines
36 KiB
Plaintext
/*
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* Copyright (c) 1985, 1988, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)ftpcmd.y 8.3 (Berkeley) 4/6/94
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*/
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/*
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* Grammar for FTP commands.
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* See RFC 959.
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*/
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%{
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)ftpcmd.y 8.3 (Berkeley) 4/6/94";
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#endif
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <netinet/in.h>
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#include <arpa/ftp.h>
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#include <ctype.h>
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#include <errno.h>
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#include <glob.h>
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#include <libutil.h>
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#include <limits.h>
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#include <md5.h>
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#include <netdb.h>
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#include <pwd.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include <time.h>
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#include <unistd.h>
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#include "extern.h"
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#include "pathnames.h"
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extern union sockunion data_dest, his_addr;
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extern int hostinfo;
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extern int logged_in;
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extern struct passwd *pw;
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extern int guest;
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extern char *homedir;
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extern int paranoid;
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extern int logging;
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extern int type;
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extern int form;
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extern int ftpdebug;
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extern int timeout;
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extern int maxtimeout;
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extern int pdata;
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extern char *hostname;
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extern char proctitle[];
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extern int usedefault;
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extern char tmpline[];
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extern int readonly;
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extern int noepsv;
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extern int noretr;
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extern int noguestretr;
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extern char *typenames[]; /* defined in <arpa/ftp.h> included from ftpd.c */
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off_t restart_point;
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static int cmd_type;
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static int cmd_form;
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static int cmd_bytesz;
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static int state;
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char cbuf[512];
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char *fromname = (char *) 0;
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extern int epsvall;
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%}
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%union {
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struct {
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off_t o;
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int i;
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} u;
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char *s;
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}
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%token
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A B C E F I
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L N P R S T
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ALL
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SP CRLF COMMA
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USER PASS ACCT REIN QUIT PORT
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PASV TYPE STRU MODE RETR STOR
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APPE MLFL MAIL MSND MSOM MSAM
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MRSQ MRCP ALLO REST RNFR RNTO
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ABOR DELE CWD LIST NLST SITE
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STAT HELP NOOP MKD RMD PWD
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CDUP STOU SMNT SYST SIZE MDTM
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LPRT LPSV EPRT EPSV
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UMASK IDLE CHMOD MDFIVE
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LEXERR NOTIMPL
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%token <s> STRING
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%token <u> NUMBER
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%type <u.i> check_login octal_number byte_size
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%type <u.i> check_login_ro check_login_epsv
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%type <u.i> struct_code mode_code type_code form_code
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%type <s> pathstring pathname password username
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%type <s> ALL NOTIMPL
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%start cmd_list
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%%
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cmd_list
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: /* empty */
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| cmd_list cmd
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{
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if (fromname)
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free(fromname);
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fromname = (char *) 0;
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restart_point = (off_t) 0;
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}
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| cmd_list rcmd
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;
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cmd
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: USER SP username CRLF
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{
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user($3);
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free($3);
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}
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| PASS SP password CRLF
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{
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pass($3);
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free($3);
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}
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| PASS CRLF
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{
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pass("");
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}
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| PORT check_login SP host_port CRLF
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{
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if (epsvall) {
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reply(501, "no PORT allowed after EPSV ALL");
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goto port_done;
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}
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if (!$2)
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goto port_done;
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if (port_check("PORT") == 1)
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goto port_done;
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#ifdef INET6
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if ((his_addr.su_family != AF_INET6 ||
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!IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr))) {
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/* shoud never happen */
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usedefault = 1;
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reply(500, "Invalid address rejected.");
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goto port_done;
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}
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port_check_v6("pcmd");
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#endif
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port_done:
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42; /* Life, the universe and everything! */
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}
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| LPRT check_login SP host_long_port CRLF
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{
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if (epsvall) {
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reply(501, "no LPRT allowed after EPSV ALL");
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goto lprt_done;
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}
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if (!$2)
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goto lprt_done;
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if (port_check("LPRT") == 1)
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goto lprt_done;
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#ifdef INET6
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if (his_addr.su_family != AF_INET6) {
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usedefault = 1;
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reply(500, "Invalid address rejected.");
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goto lprt_done;
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}
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if (port_check_v6("LPRT") == 1)
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goto lprt_done;
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#endif
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lprt_done:
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42; /* Life, the universe and everything! */
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}
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| EPRT check_login SP STRING CRLF
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{
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char delim;
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char *tmp = NULL;
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char *p, *q;
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char *result[3];
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struct addrinfo hints;
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struct addrinfo *res;
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int i;
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if (epsvall) {
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reply(501, "no EPRT allowed after EPSV ALL");
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goto eprt_done;
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}
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if (!$2)
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goto eprt_done;
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memset(&data_dest, 0, sizeof(data_dest));
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tmp = strdup($4);
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if (ftpdebug)
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syslog(LOG_DEBUG, "%s", tmp);
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if (!tmp) {
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fatalerror("not enough core");
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/*NOTREACHED*/
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}
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p = tmp;
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delim = p[0];
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p++;
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memset(result, 0, sizeof(result));
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for (i = 0; i < 3; i++) {
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q = strchr(p, delim);
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if (!q || *q != delim) {
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parsefail:
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reply(500,
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"Invalid argument, rejected.");
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if (tmp)
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free(tmp);
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usedefault = 1;
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goto eprt_done;
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}
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*q++ = '\0';
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result[i] = p;
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if (ftpdebug)
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syslog(LOG_DEBUG, "%d: %s", i, p);
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p = q;
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}
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/* some more sanity check */
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p = result[0];
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while (*p) {
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if (!isdigit(*p))
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goto parsefail;
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p++;
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}
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p = result[2];
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while (*p) {
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if (!isdigit(*p))
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goto parsefail;
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p++;
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}
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/* grab address */
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memset(&hints, 0, sizeof(hints));
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if (atoi(result[0]) == 1)
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hints.ai_family = PF_INET;
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#ifdef INET6
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else if (atoi(result[0]) == 2)
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hints.ai_family = PF_INET6;
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#endif
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else
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hints.ai_family = PF_UNSPEC; /*XXX*/
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hints.ai_socktype = SOCK_STREAM;
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i = getaddrinfo(result[1], result[2], &hints, &res);
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if (i)
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goto parsefail;
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memcpy(&data_dest, res->ai_addr, res->ai_addrlen);
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#ifdef INET6
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if (his_addr.su_family == AF_INET6
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&& data_dest.su_family == AF_INET6) {
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/* XXX more sanity checks! */
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data_dest.su_sin6.sin6_scope_id =
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his_addr.su_sin6.sin6_scope_id;
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}
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#endif
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free(tmp);
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tmp = NULL;
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if (port_check("EPRT") == 1)
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goto eprt_done;
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#ifdef INET6
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if (his_addr.su_family != AF_INET6) {
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usedefault = 1;
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reply(500, "Invalid address rejected.");
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goto eprt_done;
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}
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if (port_check_v6("EPRT") == 1)
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goto eprt_done;
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#endif
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eprt_done:
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free($4);
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}
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| PASV check_login CRLF
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{
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if (epsvall)
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reply(501, "no PASV allowed after EPSV ALL");
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else if ($2)
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passive();
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}
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| LPSV check_login CRLF
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{
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if (epsvall)
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reply(501, "no LPSV allowed after EPSV ALL");
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else if ($2)
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long_passive("LPSV", PF_UNSPEC);
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}
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| EPSV check_login_epsv SP NUMBER CRLF
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{
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if ($2) {
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int pf;
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switch ($4.i) {
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case 1:
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pf = PF_INET;
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break;
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#ifdef INET6
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case 2:
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pf = PF_INET6;
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break;
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#endif
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default:
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pf = -1; /*junk value*/
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break;
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}
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long_passive("EPSV", pf);
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}
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}
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| EPSV check_login_epsv SP ALL CRLF
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{
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if ($2) {
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reply(200,
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"EPSV ALL command successful.");
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epsvall++;
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}
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}
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| EPSV check_login_epsv CRLF
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{
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if ($2)
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long_passive("EPSV", PF_UNSPEC);
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}
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| TYPE check_login SP type_code CRLF
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{
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if ($2) {
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switch (cmd_type) {
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case TYPE_A:
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if (cmd_form == FORM_N) {
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reply(200, "Type set to A.");
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type = cmd_type;
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form = cmd_form;
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} else
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reply(504, "Form must be N.");
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break;
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case TYPE_E:
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reply(504, "Type E not implemented.");
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break;
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case TYPE_I:
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reply(200, "Type set to I.");
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type = cmd_type;
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break;
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case TYPE_L:
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#if CHAR_BIT == 8
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if (cmd_bytesz == 8) {
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reply(200,
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"Type set to L (byte size 8).");
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type = cmd_type;
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} else
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reply(504, "Byte size must be 8.");
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#else /* CHAR_BIT == 8 */
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UNIMPLEMENTED for CHAR_BIT != 8
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#endif /* CHAR_BIT == 8 */
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}
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}
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}
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| STRU check_login SP struct_code CRLF
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{
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if ($2) {
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switch ($4) {
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case STRU_F:
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reply(200, "STRU F ok.");
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break;
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default:
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reply(504, "Unimplemented STRU type.");
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}
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}
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}
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| MODE check_login SP mode_code CRLF
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{
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if ($2) {
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switch ($4) {
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case MODE_S:
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reply(200, "MODE S ok.");
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break;
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default:
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reply(502, "Unimplemented MODE type.");
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}
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}
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}
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| ALLO check_login SP NUMBER CRLF
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{
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if ($2) {
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reply(202, "ALLO command ignored.");
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}
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}
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| ALLO check_login SP NUMBER SP R SP NUMBER CRLF
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{
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if ($2) {
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reply(202, "ALLO command ignored.");
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}
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}
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| RETR check_login SP pathname CRLF
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{
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if (noretr || (guest && noguestretr))
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reply(500, "RETR command is disabled");
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else if ($2 && $4 != NULL)
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retrieve((char *) 0, $4);
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if ($4 != NULL)
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free($4);
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}
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| STOR check_login_ro SP pathname CRLF
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{
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if ($2 && $4 != NULL)
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store($4, "w", 0);
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if ($4 != NULL)
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free($4);
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}
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| APPE check_login_ro SP pathname CRLF
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{
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if ($2 && $4 != NULL)
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store($4, "a", 0);
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if ($4 != NULL)
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free($4);
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}
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| NLST check_login CRLF
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|
{
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|
if ($2)
|
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send_file_list(".");
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}
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|
| NLST check_login SP pathstring CRLF
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|
{
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if ($2)
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send_file_list($4);
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free($4);
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}
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| LIST check_login CRLF
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|
{
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if ($2)
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|
retrieve(_PATH_LS " -lgA", "");
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|
}
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| LIST check_login SP pathstring CRLF
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|
{
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if ($2)
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|
retrieve(_PATH_LS " -lgA %s", $4);
|
|
free($4);
|
|
}
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|
| STAT check_login SP pathname CRLF
|
|
{
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if ($2 && $4 != NULL)
|
|
statfilecmd($4);
|
|
if ($4 != NULL)
|
|
free($4);
|
|
}
|
|
| STAT check_login CRLF
|
|
{
|
|
if ($2) {
|
|
statcmd();
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|
}
|
|
}
|
|
| 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
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|
{
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|
if ($2 && $4 != NULL) {
|
|
if (fromname) {
|
|
renamecmd(fromname, $4);
|
|
free(fromname);
|
|
fromname = (char *) 0;
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|
} else {
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|
reply(503, "Bad sequence of commands.");
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|
}
|
|
}
|
|
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
|
|
{
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|
if ($2 && $4 != NULL)
|
|
cwd($4);
|
|
if ($4 != NULL)
|
|
free($4);
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|
}
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|
| HELP CRLF
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|
{
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|
help(cmdtab, (char *) 0);
|
|
}
|
|
| 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, (char *) 0);
|
|
} 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, (char *) 0);
|
|
}
|
|
| 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((unsigned) 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);
|
|
}
|
|
| 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)
|
|
reply(550, "%s: %s",
|
|
$4, strerror(errno));
|
|
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 = (off_t) 0;
|
|
if ($2 && $4) {
|
|
if (fromname)
|
|
free(fromname);
|
|
fromname = (char *) 0;
|
|
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 = (char *) 0;
|
|
restart_point = $4.o;
|
|
reply(350, "Restarting at %llu. %s",
|
|
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;
|
|
}
|
|
ret += digit * multby;
|
|
multby *= 8;
|
|
dec /= 10;
|
|
}
|
|
$$ = ret;
|
|
}
|
|
;
|
|
|
|
|
|
check_login
|
|
: /* empty */
|
|
{
|
|
$$ = check_login1();
|
|
}
|
|
;
|
|
|
|
check_login_epsv
|
|
: /* empty */
|
|
{
|
|
if (noepsv) {
|
|
reply(500, "EPSV command disabled");
|
|
$$ = 0;
|
|
}
|
|
else
|
|
$$ = check_login1();
|
|
}
|
|
;
|
|
|
|
check_login_ro
|
|
: /* empty */
|
|
{
|
|
if (readonly) {
|
|
reply(550, "Permission denied.");
|
|
$$ = 0;
|
|
}
|
|
else
|
|
$$ = check_login1();
|
|
}
|
|
;
|
|
|
|
%%
|
|
|
|
#define CMD 0 /* beginning of command */
|
|
#define ARGS 1 /* expect miscellaneous arguments */
|
|
#define STR1 2 /* expect SP followed by STRING */
|
|
#define STR2 3 /* expect STRING */
|
|
#define OSTR 4 /* optional SP then STRING */
|
|
#define ZSTR1 5 /* optional SP then optional STRING */
|
|
#define ZSTR2 6 /* optional STRING after SP */
|
|
#define SITECMD 7 /* SITE command */
|
|
#define NSTR 8 /* Number followed by a string */
|
|
|
|
#define MAXGLOBARGS 1000
|
|
|
|
#define MAXASIZE 10240 /* Deny ASCII SIZE on files larger than that */
|
|
|
|
struct tab {
|
|
char *name;
|
|
short token;
|
|
short state;
|
|
short implemented; /* 1 if command is implemented */
|
|
char *help;
|
|
};
|
|
|
|
struct tab cmdtab[] = { /* In order defined in RFC 765 */
|
|
{ "USER", USER, STR1, 1, "<sp> username" },
|
|
{ "PASS", PASS, ZSTR1, 1, "[<sp> [password]]" },
|
|
{ "ACCT", ACCT, STR1, 0, "(specify account)" },
|
|
{ "SMNT", SMNT, ARGS, 0, "(structure mount)" },
|
|
{ "REIN", REIN, ARGS, 0, "(reinitialize server state)" },
|
|
{ "QUIT", QUIT, ARGS, 1, "(terminate service)", },
|
|
{ "PORT", PORT, ARGS, 1, "<sp> b0, b1, b2, b3, b4, b5" },
|
|
{ "LPRT", LPRT, ARGS, 1, "<sp> af, hal, h1, h2, h3,..., pal, p1, p2..." },
|
|
{ "EPRT", EPRT, STR1, 1, "<sp> |af|addr|port|" },
|
|
{ "PASV", PASV, ARGS, 1, "(set server in passive mode)" },
|
|
{ "LPSV", LPSV, ARGS, 1, "(set server in passive mode)" },
|
|
{ "EPSV", EPSV, ARGS, 1, "[<sp> af|ALL]" },
|
|
{ "TYPE", TYPE, ARGS, 1, "<sp> { A | E | I | L }" },
|
|
{ "STRU", STRU, ARGS, 1, "(specify file structure)" },
|
|
{ "MODE", MODE, ARGS, 1, "(specify transfer mode)" },
|
|
{ "RETR", RETR, STR1, 1, "<sp> file-name" },
|
|
{ "STOR", STOR, STR1, 1, "<sp> file-name" },
|
|
{ "APPE", APPE, STR1, 1, "<sp> file-name" },
|
|
{ "MLFL", MLFL, OSTR, 0, "(mail file)" },
|
|
{ "MAIL", MAIL, OSTR, 0, "(mail to user)" },
|
|
{ "MSND", MSND, OSTR, 0, "(mail send to terminal)" },
|
|
{ "MSOM", MSOM, OSTR, 0, "(mail send to terminal or mailbox)" },
|
|
{ "MSAM", MSAM, OSTR, 0, "(mail send to terminal and mailbox)" },
|
|
{ "MRSQ", MRSQ, OSTR, 0, "(mail recipient scheme question)" },
|
|
{ "MRCP", MRCP, STR1, 0, "(mail recipient)" },
|
|
{ "ALLO", ALLO, ARGS, 1, "allocate storage (vacuously)" },
|
|
{ "REST", REST, ARGS, 1, "<sp> offset (restart command)" },
|
|
{ "RNFR", RNFR, STR1, 1, "<sp> file-name" },
|
|
{ "RNTO", RNTO, STR1, 1, "<sp> file-name" },
|
|
{ "ABOR", ABOR, ARGS, 1, "(abort operation)" },
|
|
{ "DELE", DELE, STR1, 1, "<sp> file-name" },
|
|
{ "CWD", CWD, OSTR, 1, "[ <sp> directory-name ]" },
|
|
{ "XCWD", CWD, OSTR, 1, "[ <sp> directory-name ]" },
|
|
{ "LIST", LIST, OSTR, 1, "[ <sp> path-name ]" },
|
|
{ "NLST", NLST, OSTR, 1, "[ <sp> path-name ]" },
|
|
{ "SITE", SITE, SITECMD, 1, "site-cmd [ <sp> arguments ]" },
|
|
{ "SYST", SYST, ARGS, 1, "(get type of operating system)" },
|
|
{ "STAT", STAT, OSTR, 1, "[ <sp> path-name ]" },
|
|
{ "HELP", HELP, OSTR, 1, "[ <sp> <string> ]" },
|
|
{ "NOOP", NOOP, ARGS, 1, "" },
|
|
{ "MKD", MKD, STR1, 1, "<sp> path-name" },
|
|
{ "XMKD", MKD, STR1, 1, "<sp> path-name" },
|
|
{ "RMD", RMD, STR1, 1, "<sp> path-name" },
|
|
{ "XRMD", RMD, STR1, 1, "<sp> path-name" },
|
|
{ "PWD", PWD, ARGS, 1, "(return current directory)" },
|
|
{ "XPWD", PWD, ARGS, 1, "(return current directory)" },
|
|
{ "CDUP", CDUP, ARGS, 1, "(change to parent directory)" },
|
|
{ "XCUP", CDUP, ARGS, 1, "(change to parent directory)" },
|
|
{ "STOU", STOU, STR1, 1, "<sp> file-name" },
|
|
{ "SIZE", SIZE, OSTR, 1, "<sp> path-name" },
|
|
{ "MDTM", MDTM, OSTR, 1, "<sp> path-name" },
|
|
{ NULL, 0, 0, 0, 0 }
|
|
};
|
|
|
|
struct tab sitetab[] = {
|
|
{ "MD5", MDFIVE, STR1, 1, "[ <sp> file-name ]" },
|
|
{ "UMASK", UMASK, ARGS, 1, "[ <sp> umask ]" },
|
|
{ "IDLE", IDLE, ARGS, 1, "[ <sp> maximum-idle-time ]" },
|
|
{ "CHMOD", CHMOD, NSTR, 1, "<sp> mode <sp> file-name" },
|
|
{ "HELP", HELP, OSTR, 1, "[ <sp> <string> ]" },
|
|
{ NULL, 0, 0, 0, 0 }
|
|
};
|
|
|
|
static char *copy(char *);
|
|
static char *expglob(char *);
|
|
static char *exptilde(char *);
|
|
static void help(struct tab *, char *);
|
|
static struct tab *
|
|
lookup(struct tab *, char *);
|
|
static int port_check(const char *);
|
|
static int port_check_v6(const char *);
|
|
static void sizecmd(char *);
|
|
static void toolong(int);
|
|
static void v4map_data_dest(void);
|
|
static int yylex(void);
|
|
|
|
static struct tab *
|
|
lookup(struct tab *p, char *cmd)
|
|
{
|
|
|
|
for (; p->name != NULL; p++)
|
|
if (strcmp(cmd, p->name) == 0)
|
|
return (p);
|
|
return (0);
|
|
}
|
|
|
|
#include <arpa/telnet.h>
|
|
|
|
/*
|
|
* getline - a hacked up version of fgets to ignore TELNET escape codes.
|
|
*/
|
|
char *
|
|
getline(char *s, int n, FILE *iop)
|
|
{
|
|
int c;
|
|
register char *cs;
|
|
sigset_t sset, osset;
|
|
|
|
cs = s;
|
|
/* tmpline may contain saved command from urgent mode interruption */
|
|
for (c = 0; tmpline[c] != '\0' && --n > 0; ++c) {
|
|
*cs++ = tmpline[c];
|
|
if (tmpline[c] == '\n') {
|
|
*cs++ = '\0';
|
|
if (ftpdebug)
|
|
syslog(LOG_DEBUG, "command: %s", s);
|
|
tmpline[0] = '\0';
|
|
return(s);
|
|
}
|
|
if (c == 0)
|
|
tmpline[0] = '\0';
|
|
}
|
|
/* SIGURG would interrupt stdio if not blocked during the read loop */
|
|
sigemptyset(&sset);
|
|
sigaddset(&sset, SIGURG);
|
|
sigprocmask(SIG_BLOCK, &sset, &osset);
|
|
while ((c = getc(iop)) != EOF) {
|
|
c &= 0377;
|
|
if (c == IAC) {
|
|
if ((c = getc(iop)) == EOF)
|
|
goto got_eof;
|
|
c &= 0377;
|
|
switch (c) {
|
|
case WILL:
|
|
case WONT:
|
|
if ((c = getc(iop)) == EOF)
|
|
goto got_eof;
|
|
printf("%c%c%c", IAC, DONT, 0377&c);
|
|
(void) fflush(stdout);
|
|
continue;
|
|
case DO:
|
|
case DONT:
|
|
if ((c = getc(iop)) == EOF)
|
|
goto got_eof;
|
|
printf("%c%c%c", IAC, WONT, 0377&c);
|
|
(void) fflush(stdout);
|
|
continue;
|
|
case IAC:
|
|
break;
|
|
default:
|
|
continue; /* ignore command */
|
|
}
|
|
}
|
|
*cs++ = c;
|
|
if (--n <= 0 || c == '\n')
|
|
break;
|
|
}
|
|
got_eof:
|
|
sigprocmask(SIG_SETMASK, &osset, NULL);
|
|
if (c == EOF && cs == s)
|
|
return (NULL);
|
|
*cs++ = '\0';
|
|
if (ftpdebug) {
|
|
if (!guest && strncasecmp("pass ", s, 5) == 0) {
|
|
/* Don't syslog passwords */
|
|
syslog(LOG_DEBUG, "command: %.5s ???", s);
|
|
} else {
|
|
register char *cp;
|
|
register int len;
|
|
|
|
/* Don't syslog trailing CR-LF */
|
|
len = strlen(s);
|
|
cp = s + len - 1;
|
|
while (cp >= s && (*cp == '\n' || *cp == '\r')) {
|
|
--cp;
|
|
--len;
|
|
}
|
|
syslog(LOG_DEBUG, "command: %.*s", len, s);
|
|
}
|
|
}
|
|
return (s);
|
|
}
|
|
|
|
static void
|
|
toolong(int signo)
|
|
{
|
|
|
|
reply(421,
|
|
"Timeout (%d seconds): closing control connection.", timeout);
|
|
if (logging)
|
|
syslog(LOG_INFO, "User %s timed out after %d seconds",
|
|
(pw ? pw -> pw_name : "unknown"), timeout);
|
|
dologout(1);
|
|
}
|
|
|
|
static int
|
|
yylex(void)
|
|
{
|
|
static int cpos;
|
|
char *cp, *cp2;
|
|
struct tab *p;
|
|
int n;
|
|
char c;
|
|
|
|
for (;;) {
|
|
switch (state) {
|
|
|
|
case CMD:
|
|
(void) signal(SIGALRM, toolong);
|
|
(void) alarm((unsigned) timeout);
|
|
if (getline(cbuf, sizeof(cbuf)-1, stdin) == NULL) {
|
|
reply(221, "You could at least say goodbye.");
|
|
dologout(0);
|
|
}
|
|
(void) alarm(0);
|
|
#ifdef SETPROCTITLE
|
|
if (strncasecmp(cbuf, "PASS", 4) != 0)
|
|
setproctitle("%s: %s", proctitle, cbuf);
|
|
#endif /* SETPROCTITLE */
|
|
if ((cp = strchr(cbuf, '\r'))) {
|
|
*cp++ = '\n';
|
|
*cp = '\0';
|
|
}
|
|
if ((cp = strpbrk(cbuf, " \n")))
|
|
cpos = cp - cbuf;
|
|
if (cpos == 0)
|
|
cpos = 4;
|
|
c = cbuf[cpos];
|
|
cbuf[cpos] = '\0';
|
|
upper(cbuf);
|
|
p = lookup(cmdtab, cbuf);
|
|
cbuf[cpos] = c;
|
|
if (p != 0) {
|
|
yylval.s = p->name;
|
|
if (!p->implemented)
|
|
return (NOTIMPL); /* state remains CMD */
|
|
state = p->state;
|
|
return (p->token);
|
|
}
|
|
break;
|
|
|
|
case SITECMD:
|
|
if (cbuf[cpos] == ' ') {
|
|
cpos++;
|
|
return (SP);
|
|
}
|
|
cp = &cbuf[cpos];
|
|
if ((cp2 = strpbrk(cp, " \n")))
|
|
cpos = cp2 - cbuf;
|
|
c = cbuf[cpos];
|
|
cbuf[cpos] = '\0';
|
|
upper(cp);
|
|
p = lookup(sitetab, cp);
|
|
cbuf[cpos] = c;
|
|
if (guest == 0 && p != 0) {
|
|
yylval.s = p->name;
|
|
if (!p->implemented) {
|
|
state = CMD;
|
|
return (NOTIMPL);
|
|
}
|
|
state = p->state;
|
|
return (p->token);
|
|
}
|
|
state = CMD;
|
|
break;
|
|
|
|
case ZSTR1:
|
|
case OSTR:
|
|
if (cbuf[cpos] == '\n') {
|
|
state = CMD;
|
|
return (CRLF);
|
|
}
|
|
/* FALLTHROUGH */
|
|
|
|
case STR1:
|
|
dostr1:
|
|
if (cbuf[cpos] == ' ') {
|
|
cpos++;
|
|
state = state == OSTR ? STR2 : state+1;
|
|
return (SP);
|
|
}
|
|
break;
|
|
|
|
case ZSTR2:
|
|
if (cbuf[cpos] == '\n') {
|
|
state = CMD;
|
|
return (CRLF);
|
|
}
|
|
/* FALLTHROUGH */
|
|
|
|
case STR2:
|
|
cp = &cbuf[cpos];
|
|
n = strlen(cp);
|
|
cpos += n - 1;
|
|
/*
|
|
* Make sure the string is nonempty and \n terminated.
|
|
*/
|
|
if (n > 1 && cbuf[cpos] == '\n') {
|
|
cbuf[cpos] = '\0';
|
|
yylval.s = copy(cp);
|
|
cbuf[cpos] = '\n';
|
|
state = ARGS;
|
|
return (STRING);
|
|
}
|
|
break;
|
|
|
|
case NSTR:
|
|
if (cbuf[cpos] == ' ') {
|
|
cpos++;
|
|
return (SP);
|
|
}
|
|
if (isdigit(cbuf[cpos])) {
|
|
cp = &cbuf[cpos];
|
|
while (isdigit(cbuf[++cpos]))
|
|
;
|
|
c = cbuf[cpos];
|
|
cbuf[cpos] = '\0';
|
|
yylval.u.i = atoi(cp);
|
|
cbuf[cpos] = c;
|
|
state = STR1;
|
|
return (NUMBER);
|
|
}
|
|
state = STR1;
|
|
goto dostr1;
|
|
|
|
case ARGS:
|
|
if (isdigit(cbuf[cpos])) {
|
|
cp = &cbuf[cpos];
|
|
while (isdigit(cbuf[++cpos]))
|
|
;
|
|
c = cbuf[cpos];
|
|
cbuf[cpos] = '\0';
|
|
yylval.u.i = atoi(cp);
|
|
yylval.u.o = strtoull(cp, (char **)NULL, 10);
|
|
cbuf[cpos] = c;
|
|
return (NUMBER);
|
|
}
|
|
if (strncasecmp(&cbuf[cpos], "ALL", 3) == 0
|
|
&& !isalnum(cbuf[cpos + 3])) {
|
|
cpos += 3;
|
|
return ALL;
|
|
}
|
|
switch (cbuf[cpos++]) {
|
|
|
|
case '\n':
|
|
state = CMD;
|
|
return (CRLF);
|
|
|
|
case ' ':
|
|
return (SP);
|
|
|
|
case ',':
|
|
return (COMMA);
|
|
|
|
case 'A':
|
|
case 'a':
|
|
return (A);
|
|
|
|
case 'B':
|
|
case 'b':
|
|
return (B);
|
|
|
|
case 'C':
|
|
case 'c':
|
|
return (C);
|
|
|
|
case 'E':
|
|
case 'e':
|
|
return (E);
|
|
|
|
case 'F':
|
|
case 'f':
|
|
return (F);
|
|
|
|
case 'I':
|
|
case 'i':
|
|
return (I);
|
|
|
|
case 'L':
|
|
case 'l':
|
|
return (L);
|
|
|
|
case 'N':
|
|
case 'n':
|
|
return (N);
|
|
|
|
case 'P':
|
|
case 'p':
|
|
return (P);
|
|
|
|
case 'R':
|
|
case 'r':
|
|
return (R);
|
|
|
|
case 'S':
|
|
case 's':
|
|
return (S);
|
|
|
|
case 'T':
|
|
case 't':
|
|
return (T);
|
|
|
|
}
|
|
break;
|
|
|
|
default:
|
|
fatalerror("Unknown state in scanner.");
|
|
}
|
|
state = CMD;
|
|
return (LEXERR);
|
|
}
|
|
}
|
|
|
|
void
|
|
upper(char *s)
|
|
{
|
|
while (*s != '\0') {
|
|
if (islower(*s))
|
|
*s = toupper(*s);
|
|
s++;
|
|
}
|
|
}
|
|
|
|
static char *
|
|
copy(char *s)
|
|
{
|
|
char *p;
|
|
|
|
p = malloc((unsigned) strlen(s) + 1);
|
|
if (p == NULL)
|
|
fatalerror("Ran out of memory.");
|
|
(void) strcpy(p, s);
|
|
return (p);
|
|
}
|
|
|
|
static void
|
|
help(struct tab *ctab, char *s)
|
|
{
|
|
struct tab *c;
|
|
int width, NCMDS;
|
|
char *type;
|
|
|
|
if (ctab == sitetab)
|
|
type = "SITE ";
|
|
else
|
|
type = "";
|
|
width = 0, NCMDS = 0;
|
|
for (c = ctab; c->name != NULL; c++) {
|
|
int len = strlen(c->name);
|
|
|
|
if (len > width)
|
|
width = len;
|
|
NCMDS++;
|
|
}
|
|
width = (width + 8) &~ 7;
|
|
if (s == 0) {
|
|
int i, j, w;
|
|
int columns, lines;
|
|
|
|
lreply(214, "The following %scommands are recognized %s.",
|
|
type, "(* =>'s unimplemented)");
|
|
columns = 76 / width;
|
|
if (columns == 0)
|
|
columns = 1;
|
|
lines = (NCMDS + columns - 1) / columns;
|
|
for (i = 0; i < lines; i++) {
|
|
printf(" ");
|
|
for (j = 0; j < columns; j++) {
|
|
c = ctab + j * lines + i;
|
|
printf("%s%c", c->name,
|
|
c->implemented ? ' ' : '*');
|
|
if (c + lines >= &ctab[NCMDS])
|
|
break;
|
|
w = strlen(c->name) + 1;
|
|
while (w < width) {
|
|
putchar(' ');
|
|
w++;
|
|
}
|
|
}
|
|
printf("\r\n");
|
|
}
|
|
(void) fflush(stdout);
|
|
if (hostinfo)
|
|
reply(214, "Direct comments to ftp-bugs@%s.", hostname);
|
|
else
|
|
reply(214, "End.");
|
|
return;
|
|
}
|
|
upper(s);
|
|
c = lookup(ctab, s);
|
|
if (c == (struct tab *)0) {
|
|
reply(502, "Unknown command %s.", s);
|
|
return;
|
|
}
|
|
if (c->implemented)
|
|
reply(214, "Syntax: %s%s %s", type, c->name, c->help);
|
|
else
|
|
reply(214, "%s%-*s\t%s; unimplemented.", type, width,
|
|
c->name, c->help);
|
|
}
|
|
|
|
static void
|
|
sizecmd(char *filename)
|
|
{
|
|
switch (type) {
|
|
case TYPE_L:
|
|
case TYPE_I: {
|
|
struct stat stbuf;
|
|
if (stat(filename, &stbuf) < 0)
|
|
perror_reply(550, filename);
|
|
else if (!S_ISREG(stbuf.st_mode))
|
|
reply(550, "%s: not a plain file.", filename);
|
|
else
|
|
reply(213, "%qu", stbuf.st_size);
|
|
break; }
|
|
case TYPE_A: {
|
|
FILE *fin;
|
|
int c;
|
|
off_t count;
|
|
struct stat stbuf;
|
|
fin = fopen(filename, "r");
|
|
if (fin == NULL) {
|
|
perror_reply(550, filename);
|
|
return;
|
|
}
|
|
if (fstat(fileno(fin), &stbuf) < 0) {
|
|
perror_reply(550, filename);
|
|
(void) fclose(fin);
|
|
return;
|
|
} else if (!S_ISREG(stbuf.st_mode)) {
|
|
reply(550, "%s: not a plain file.", filename);
|
|
(void) fclose(fin);
|
|
return;
|
|
} else if (stbuf.st_size > MAXASIZE) {
|
|
reply(550, "%s: too large for type A SIZE.", filename);
|
|
(void) fclose(fin);
|
|
return;
|
|
}
|
|
|
|
count = 0;
|
|
while((c=getc(fin)) != EOF) {
|
|
if (c == '\n') /* will get expanded to \r\n */
|
|
count++;
|
|
count++;
|
|
}
|
|
(void) fclose(fin);
|
|
|
|
reply(213, "%qd", count);
|
|
break; }
|
|
default:
|
|
reply(504, "SIZE not implemented for type %s.",
|
|
typenames[type]);
|
|
}
|
|
}
|
|
|
|
/* Return 1, if port check is done. Return 0, if not yet. */
|
|
static int
|
|
port_check(const char *pcmd)
|
|
{
|
|
if (his_addr.su_family == AF_INET) {
|
|
if (data_dest.su_family != AF_INET) {
|
|
usedefault = 1;
|
|
reply(500, "Invalid address rejected.");
|
|
return 1;
|
|
}
|
|
if (paranoid &&
|
|
((ntohs(data_dest.su_port) < IPPORT_RESERVED) ||
|
|
memcmp(&data_dest.su_sin.sin_addr,
|
|
&his_addr.su_sin.sin_addr,
|
|
sizeof(data_dest.su_sin.sin_addr)))) {
|
|
usedefault = 1;
|
|
reply(500, "Illegal PORT range rejected.");
|
|
} else {
|
|
usedefault = 0;
|
|
if (pdata >= 0) {
|
|
(void) close(pdata);
|
|
pdata = -1;
|
|
}
|
|
reply(200, "%s command successful.", pcmd);
|
|
}
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
check_login1(void)
|
|
{
|
|
if (logged_in)
|
|
return 1;
|
|
else {
|
|
reply(530, "Please login with USER and PASS.");
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Replace leading "~user" in a pathname by the user's login directory.
|
|
* Returned string will be in a freshly malloced buffer unless it's NULL.
|
|
*/
|
|
static char *
|
|
exptilde(char *s)
|
|
{
|
|
char *p, *q;
|
|
char *path, *user;
|
|
struct passwd *ppw;
|
|
|
|
if ((p = strdup(s)) == NULL)
|
|
return (NULL);
|
|
if (*p != '~')
|
|
return (p);
|
|
|
|
user = p + 1; /* skip tilde */
|
|
if ((path = strchr(p, '/')) != NULL)
|
|
*(path++) = '\0'; /* separate ~user from the rest of path */
|
|
if (*user == '\0') /* no user specified, use the current user */
|
|
user = pw->pw_name;
|
|
/* read passwd even for the current user since we may be chrooted */
|
|
if ((ppw = getpwnam(user)) != NULL) {
|
|
/* user found, substitute login directory for ~user */
|
|
if (path)
|
|
asprintf(&q, "%s/%s", ppw->pw_dir, path);
|
|
else
|
|
q = strdup(ppw->pw_dir);
|
|
free(p);
|
|
p = q;
|
|
} else {
|
|
/* user not found, undo the damage */
|
|
if (path)
|
|
path[-1] = '/';
|
|
}
|
|
return (p);
|
|
}
|
|
|
|
/*
|
|
* Expand glob(3) patterns possibly present in a pathname.
|
|
* Avoid expanding to a pathname including '\r' or '\n' in order to
|
|
* not disrupt the FTP protocol.
|
|
* The expansion found must be unique.
|
|
* Return the result as a malloced string, or NULL if an error occured.
|
|
*
|
|
* Problem: this production is used for all pathname
|
|
* processing, but only gives a 550 error reply.
|
|
* This is a valid reply in some cases but not in others.
|
|
*/
|
|
static char *
|
|
expglob(char *s)
|
|
{
|
|
char *p, **pp, *rval;
|
|
int flags = GLOB_BRACE | GLOB_NOCHECK;
|
|
int n;
|
|
glob_t gl;
|
|
|
|
memset(&gl, 0, sizeof(gl));
|
|
flags |= GLOB_LIMIT;
|
|
gl.gl_matchc = MAXGLOBARGS;
|
|
if (glob(s, flags, NULL, &gl) == 0 && gl.gl_pathc != 0) {
|
|
for (pp = gl.gl_pathv, p = NULL, n = 0; *pp; pp++)
|
|
if (*(*pp + strcspn(*pp, "\r\n")) == '\0') {
|
|
p = *pp;
|
|
n++;
|
|
}
|
|
if (n == 0)
|
|
rval = strdup(s);
|
|
else if (n == 1)
|
|
rval = strdup(p);
|
|
else {
|
|
reply(550, "ambiguous");
|
|
rval = NULL;
|
|
}
|
|
} else {
|
|
reply(550, "wildcard expansion error");
|
|
rval = NULL;
|
|
}
|
|
globfree(&gl);
|
|
return (rval);
|
|
}
|
|
|
|
#ifdef INET6
|
|
/* Return 1, if port check is done. Return 0, if not yet. */
|
|
static int
|
|
port_check_v6(const char *pcmd)
|
|
{
|
|
if (his_addr.su_family == AF_INET6) {
|
|
if (IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr))
|
|
/* Convert data_dest into v4 mapped sockaddr.*/
|
|
v4map_data_dest();
|
|
if (data_dest.su_family != AF_INET6) {
|
|
usedefault = 1;
|
|
reply(500, "Invalid address rejected.");
|
|
return 1;
|
|
}
|
|
if (paranoid &&
|
|
((ntohs(data_dest.su_port) < IPPORT_RESERVED) ||
|
|
memcmp(&data_dest.su_sin6.sin6_addr,
|
|
&his_addr.su_sin6.sin6_addr,
|
|
sizeof(data_dest.su_sin6.sin6_addr)))) {
|
|
usedefault = 1;
|
|
reply(500, "Illegal PORT range rejected.");
|
|
} else {
|
|
usedefault = 0;
|
|
if (pdata >= 0) {
|
|
(void) close(pdata);
|
|
pdata = -1;
|
|
}
|
|
reply(200, "%s command successful.", pcmd);
|
|
}
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
v4map_data_dest(void)
|
|
{
|
|
struct in_addr savedaddr;
|
|
int savedport;
|
|
|
|
if (data_dest.su_family != AF_INET) {
|
|
usedefault = 1;
|
|
reply(500, "Invalid address rejected.");
|
|
return;
|
|
}
|
|
|
|
savedaddr = data_dest.su_sin.sin_addr;
|
|
savedport = data_dest.su_port;
|
|
|
|
memset(&data_dest, 0, sizeof(data_dest));
|
|
data_dest.su_sin6.sin6_len = sizeof(struct sockaddr_in6);
|
|
data_dest.su_sin6.sin6_family = AF_INET6;
|
|
data_dest.su_sin6.sin6_port = savedport;
|
|
memset((caddr_t)&data_dest.su_sin6.sin6_addr.s6_addr[10], 0xff, 2);
|
|
memcpy((caddr_t)&data_dest.su_sin6.sin6_addr.s6_addr[12],
|
|
(caddr_t)&savedaddr, sizeof(savedaddr));
|
|
}
|
|
#endif
|