2006 lines
43 KiB
C
2006 lines
43 KiB
C
/*
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* Copyright (c) 1985, 1988, 1990, 1992, 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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* $Id: ftpd.c,v 1.26 1996/11/20 22:13:51 pst Exp $
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*/
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#if 0
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#ifndef lint
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static char copyright[] =
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"@(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#endif
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#if 0
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#ifndef lint
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static char sccsid[] = "@(#)ftpd.c 8.4 (Berkeley) 4/16/94";
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#endif /* not lint */
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#endif
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/*
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* FTP server.
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*/
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <sys/wait.h>
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#include <sys/mman.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/tcp.h>
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#define FTP_NAMES
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#include <arpa/ftp.h>
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#include <arpa/inet.h>
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#include <arpa/telnet.h>
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#include <ctype.h>
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#include <dirent.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <glob.h>
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#include <limits.h>
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#include <netdb.h>
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#include <pwd.h>
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#include <setjmp.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 <libutil.h>
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#ifdef SKEY
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#include <skey.h>
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#endif
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#include "pathnames.h"
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#include "extern.h"
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#if __STDC__
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#include <stdarg.h>
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#else
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#include <varargs.h>
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#endif
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static char version[] = "Version 6.00";
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extern off_t restart_point;
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extern char cbuf[];
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struct sockaddr_in server_addr;
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struct sockaddr_in ctrl_addr;
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struct sockaddr_in data_source;
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struct sockaddr_in data_dest;
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struct sockaddr_in his_addr;
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struct sockaddr_in pasv_addr;
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int daemon_mode;
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int data;
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jmp_buf errcatch, urgcatch;
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int logged_in;
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struct passwd *pw;
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int debug;
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int timeout = 900; /* timeout after 15 minutes of inactivity */
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int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */
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int logging;
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int restricted_data_ports = 1;
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int paranoid = 1; /* be extra careful about security */
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int anon_only = 0; /* Only anonymous ftp allowed */
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int guest;
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int dochroot;
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int stats;
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int statfd = -1;
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int type;
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int form;
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int stru; /* avoid C keyword */
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int mode;
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int usedefault = 1; /* for data transfers */
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int pdata = -1; /* for passive mode */
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sig_atomic_t transflag;
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off_t file_size;
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off_t byte_count;
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#if !defined(CMASK) || CMASK == 0
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#undef CMASK
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#define CMASK 027
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#endif
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int defumask = CMASK; /* default umask value */
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char tmpline[7];
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char hostname[MAXHOSTNAMELEN];
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char remotehost[MAXHOSTNAMELEN];
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char *ident = NULL;
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static char ttyline[20];
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char *tty = ttyline; /* for klogin */
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#ifdef KERBEROS
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int klogin __P((struct passwd *, char *, char *, char *));
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#endif
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struct in_addr bind_address;
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char *pid_file = NULL;
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#if defined(KERBEROS)
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int notickets = 1;
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int noticketsdontcomplain = 1;
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char *krbtkfile_env = NULL;
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#endif
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/*
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* Timeout intervals for retrying connections
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* to hosts that don't accept PORT cmds. This
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* is a kludge, but given the problems with TCP...
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*/
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#define SWAITMAX 90 /* wait at most 90 seconds */
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#define SWAITINT 5 /* interval between retries */
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int swaitmax = SWAITMAX;
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int swaitint = SWAITINT;
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#ifdef SETPROCTITLE
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#ifdef OLD_SETPROCTITLE
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char **Argv = NULL; /* pointer to argument vector */
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char *LastArgv = NULL; /* end of argv */
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#endif /* OLD_SETPROCTITLE */
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char proctitle[LINE_MAX]; /* initial part of title */
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#endif /* SETPROCTITLE */
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#ifdef SKEY
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int pwok = 0;
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char addr_string[20]; /* XXX */
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#endif
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#define LOGCMD(cmd, file) \
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if (logging > 1) \
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syslog(LOG_INFO,"%s %s%s", cmd, \
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*(file) == '/' ? "" : curdir(), file);
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#define LOGCMD2(cmd, file1, file2) \
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if (logging > 1) \
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syslog(LOG_INFO,"%s %s%s %s%s", cmd, \
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*(file1) == '/' ? "" : curdir(), file1, \
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*(file2) == '/' ? "" : curdir(), file2);
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#define LOGBYTES(cmd, file, cnt) \
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if (logging > 1) { \
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if (cnt == (off_t)-1) \
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syslog(LOG_INFO,"%s %s%s", cmd, \
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*(file) == '/' ? "" : curdir(), file); \
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else \
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syslog(LOG_INFO, "%s %s%s = %qd bytes", \
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cmd, (*(file) == '/') ? "" : curdir(), file, cnt); \
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}
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static void ack __P((char *));
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static void myoob __P((int));
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static int checkuser __P((char *, char *));
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static FILE *dataconn __P((char *, off_t, char *));
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static void dolog __P((struct sockaddr_in *));
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static char *curdir __P((void));
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static void end_login __P((void));
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static FILE *getdatasock __P((char *));
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static char *gunique __P((char *));
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static void lostconn __P((int));
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static int receive_data __P((FILE *, FILE *));
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static void send_data __P((FILE *, FILE *, off_t, off_t, int));
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static struct passwd *
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sgetpwnam __P((char *));
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static char *sgetsave __P((char *));
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static void reapchild __P((int));
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static void logxfer __P((char *, long, long));
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static char *
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curdir()
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{
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static char path[MAXPATHLEN+1+1]; /* path + '/' + '\0' */
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if (getcwd(path, sizeof(path)-2) == NULL)
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return ("");
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if (path[1] != '\0') /* special case for root dir. */
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strcat(path, "/");
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/* For guest account, skip / since it's chrooted */
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return (guest ? path+1 : path);
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}
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int
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main(argc, argv, envp)
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int argc;
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char *argv[];
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char **envp;
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{
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int addrlen, ch, on = 1, tos;
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char *cp, line[LINE_MAX];
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FILE *fd;
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tzset(); /* in case no timezone database in ~ftp */
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#ifdef OLD_SETPROCTITLE
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/*
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* Save start and extent of argv for setproctitle.
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*/
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Argv = argv;
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while (*envp)
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envp++;
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LastArgv = envp[-1] + strlen(envp[-1]);
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#endif /* OLD_SETPROCTITLE */
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bind_address.s_addr = htonl(INADDR_ANY);
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while ((ch = getopt(argc, argv, "AdlDSUt:T:u:va:p:")) != EOF) {
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switch (ch) {
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case 'D':
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daemon_mode++;
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break;
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case 'd':
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debug++;
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break;
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case 'l':
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logging++; /* > 1 == extra logging */
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break;
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case 'R':
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paranoid = 0;
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break;
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case 'S':
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stats++;
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break;
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case 'T':
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maxtimeout = atoi(optarg);
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if (timeout > maxtimeout)
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timeout = maxtimeout;
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break;
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case 't':
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timeout = atoi(optarg);
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if (maxtimeout < timeout)
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maxtimeout = timeout;
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break;
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case 'U':
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restricted_data_ports = 0;
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break;
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case 'a':
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if (!inet_aton(optarg, &bind_address))
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errx(1, "invalid address for -a");
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break;
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case 'p':
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pid_file = optarg;
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break;
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case 'u':
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{
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long val = 0;
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val = strtol(optarg, &optarg, 8);
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if (*optarg != '\0' || val < 0)
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warnx("bad value for -u");
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else
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defumask = val;
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break;
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}
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case 'A':
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anon_only = 1;
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break;
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case 'v':
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debug = 1;
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break;
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default:
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warnx("unknown flag -%c ignored", optopt);
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break;
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}
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}
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(void) freopen(_PATH_DEVNULL, "w", stderr);
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/*
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* LOG_NDELAY sets up the logging connection immediately,
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* necessary for anonymous ftp's that chroot and can't do it later.
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*/
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openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP);
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if (daemon_mode) {
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int ctl_sock, fd;
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struct servent *sv;
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/*
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* Detach from parent.
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*/
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if (daemon(1, 1) < 0) {
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syslog(LOG_ERR, "failed to become a daemon");
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exit(1);
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}
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(void) signal(SIGCHLD, reapchild);
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/*
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* Get port number for ftp/tcp.
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*/
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sv = getservbyname("ftp", "tcp");
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if (sv == NULL) {
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syslog(LOG_ERR, "getservbyname for ftp failed");
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exit(1);
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}
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/*
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* Open a socket, bind it to the FTP port, and start
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* listening.
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*/
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ctl_sock = socket(AF_INET, SOCK_STREAM, 0);
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if (ctl_sock < 0) {
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syslog(LOG_ERR, "control socket: %m");
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exit(1);
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}
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if (setsockopt(ctl_sock, SOL_SOCKET, SO_REUSEADDR,
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(char *)&on, sizeof(on)) < 0)
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syslog(LOG_ERR, "control setsockopt: %m");;
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server_addr.sin_family = AF_INET;
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server_addr.sin_addr = bind_address;
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server_addr.sin_port = sv->s_port;
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if (bind(ctl_sock, (struct sockaddr *)&server_addr, sizeof(server_addr))) {
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syslog(LOG_ERR, "control bind: %m");
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exit(1);
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}
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if (listen(ctl_sock, 32) < 0) {
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syslog(LOG_ERR, "control listen: %m");
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exit(1);
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}
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/*
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* Atomically write process ID
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*/
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if (pid_file)
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{
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int fd;
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char buf[20];
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fd = open(pid_file, O_CREAT | O_WRONLY | O_TRUNC
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| O_NONBLOCK | O_EXLOCK, 0644);
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if (fd < 0)
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if (errno == EAGAIN)
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errx(1, "%s: file locked", pid_file);
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else
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err(1, "%s", pid_file);
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snprintf(buf, sizeof(buf),
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"%lu\n", (unsigned long) getpid());
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if (write(fd, buf, strlen(buf)) < 0)
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err(1, "%s: write", pid_file);
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/* Leave the pid file open and locked */
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}
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/*
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* Loop forever accepting connection requests and forking off
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* children to handle them.
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*/
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while (1) {
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addrlen = sizeof(his_addr);
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fd = accept(ctl_sock, (struct sockaddr *)&his_addr, &addrlen);
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if (fork() == 0) {
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/* child */
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(void) dup2(fd, 0);
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(void) dup2(fd, 1);
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close(ctl_sock);
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break;
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}
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close(fd);
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}
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} else {
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addrlen = sizeof(his_addr);
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if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) {
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syslog(LOG_ERR, "getpeername (%s): %m",argv[0]);
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exit(1);
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}
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}
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(void) signal(SIGCHLD, SIG_IGN);
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(void) signal(SIGPIPE, lostconn);
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if ((int)signal(SIGURG, myoob) < 0)
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syslog(LOG_ERR, "signal: %m");
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#ifdef SKEY
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strncpy(addr_string, inet_ntoa(his_addr.sin_addr), sizeof(addr_string));
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#endif
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addrlen = sizeof(ctrl_addr);
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if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) {
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syslog(LOG_ERR, "getsockname (%s): %m",argv[0]);
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exit(1);
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}
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#ifdef IP_TOS
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tos = IPTOS_LOWDELAY;
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if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, sizeof(int)) < 0)
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syslog(LOG_WARNING, "setsockopt (IP_TOS): %m");
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#endif
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data_source.sin_port = htons(ntohs(ctrl_addr.sin_port) - 1);
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/* set this here so klogin can use it... */
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(void)sprintf(ttyline, "ftp%d", getpid());
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/* Try to handle urgent data inline */
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#ifdef SO_OOBINLINE
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if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0)
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syslog(LOG_ERR, "setsockopt: %m");
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#endif
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#ifdef F_SETOWN
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if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1)
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syslog(LOG_ERR, "fcntl F_SETOWN: %m");
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#endif
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dolog(&his_addr);
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/*
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* Set up default state
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*/
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data = -1;
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type = TYPE_A;
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form = FORM_N;
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stru = STRU_F;
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mode = MODE_S;
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tmpline[0] = '\0';
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/* If logins are disabled, print out the message. */
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if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) {
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while (fgets(line, sizeof(line), fd) != NULL) {
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if ((cp = strchr(line, '\n')) != NULL)
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*cp = '\0';
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lreply(530, "%s", line);
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}
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(void) fflush(stdout);
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(void) fclose(fd);
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reply(530, "System not available.");
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exit(0);
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}
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if ((fd = fopen(_PATH_FTPWELCOME, "r")) != NULL) {
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while (fgets(line, sizeof(line), fd) != NULL) {
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if ((cp = strchr(line, '\n')) != NULL)
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*cp = '\0';
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lreply(220, "%s", line);
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}
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(void) fflush(stdout);
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(void) fclose(fd);
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/* reply(220,) must follow */
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}
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(void) gethostname(hostname, sizeof(hostname));
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reply(220, "%s FTP server (%s) ready.", hostname, version);
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(void) setjmp(errcatch);
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for (;;)
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(void) yyparse();
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/* NOTREACHED */
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}
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static void
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lostconn(signo)
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int signo;
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{
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if (debug)
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syslog(LOG_DEBUG, "lost connection");
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dologout(-1);
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}
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/*
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* Helper function for sgetpwnam().
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*/
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static char *
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sgetsave(s)
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char *s;
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{
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char *new = malloc((unsigned) strlen(s) + 1);
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if (new == NULL) {
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perror_reply(421, "Local resource failure: malloc");
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dologout(1);
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/* NOTREACHED */
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}
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(void) strcpy(new, s);
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return (new);
|
|
}
|
|
|
|
/*
|
|
* Save the result of a getpwnam. Used for USER command, since
|
|
* the data returned must not be clobbered by any other command
|
|
* (e.g., globbing).
|
|
*/
|
|
static struct passwd *
|
|
sgetpwnam(name)
|
|
char *name;
|
|
{
|
|
static struct passwd save;
|
|
struct passwd *p;
|
|
|
|
if ((p = getpwnam(name)) == NULL)
|
|
return (p);
|
|
if (save.pw_name) {
|
|
free(save.pw_name);
|
|
free(save.pw_passwd);
|
|
free(save.pw_gecos);
|
|
free(save.pw_dir);
|
|
free(save.pw_shell);
|
|
}
|
|
save = *p;
|
|
save.pw_name = sgetsave(p->pw_name);
|
|
save.pw_passwd = sgetsave(p->pw_passwd);
|
|
save.pw_gecos = sgetsave(p->pw_gecos);
|
|
save.pw_dir = sgetsave(p->pw_dir);
|
|
save.pw_shell = sgetsave(p->pw_shell);
|
|
return (&save);
|
|
}
|
|
|
|
static int login_attempts; /* number of failed login attempts */
|
|
static int askpasswd; /* had user command, ask for passwd */
|
|
static char curname[10]; /* current USER name */
|
|
|
|
/*
|
|
* USER command.
|
|
* Sets global passwd pointer pw if named account exists and is acceptable;
|
|
* sets askpasswd if a PASS command is expected. If logged in previously,
|
|
* need to reset state. If name is "ftp" or "anonymous", the name is not in
|
|
* _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return.
|
|
* If account doesn't exist, ask for passwd anyway. Otherwise, check user
|
|
* requesting login privileges. Disallow anyone who does not have a standard
|
|
* shell as returned by getusershell(). Disallow anyone mentioned in the file
|
|
* _PATH_FTPUSERS to allow people such as root and uucp to be avoided.
|
|
*/
|
|
void
|
|
user(name)
|
|
char *name;
|
|
{
|
|
char *cp, *shell;
|
|
|
|
if (logged_in) {
|
|
if (guest) {
|
|
reply(530, "Can't change user from guest login.");
|
|
return;
|
|
} else if (dochroot) {
|
|
reply(530, "Can't change user from chroot user.");
|
|
return;
|
|
}
|
|
end_login();
|
|
}
|
|
|
|
guest = 0;
|
|
if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) {
|
|
if (checkuser(_PATH_FTPUSERS, "ftp") ||
|
|
checkuser(_PATH_FTPUSERS, "anonymous"))
|
|
reply(530, "User %s access denied.", name);
|
|
else if ((pw = sgetpwnam("ftp")) != NULL) {
|
|
guest = 1;
|
|
askpasswd = 1;
|
|
reply(331,
|
|
"Guest login ok, send your email address as password.");
|
|
} else
|
|
reply(530, "User %s unknown.", name);
|
|
if (!askpasswd && logging)
|
|
syslog(LOG_NOTICE,
|
|
"ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost);
|
|
return;
|
|
}
|
|
if (anon_only != 0) {
|
|
reply(530, "Sorry, only anonymous ftp allowed.");
|
|
return;
|
|
}
|
|
|
|
if ((pw = sgetpwnam(name))) {
|
|
if ((shell = pw->pw_shell) == NULL || *shell == 0)
|
|
shell = _PATH_BSHELL;
|
|
while ((cp = getusershell()) != NULL)
|
|
if (strcmp(cp, shell) == 0)
|
|
break;
|
|
endusershell();
|
|
|
|
if (cp == NULL || checkuser(_PATH_FTPUSERS, name)) {
|
|
reply(530, "User %s access denied.", name);
|
|
if (logging)
|
|
syslog(LOG_NOTICE,
|
|
"FTP LOGIN REFUSED FROM %s, %s",
|
|
remotehost, name);
|
|
pw = (struct passwd *) NULL;
|
|
return;
|
|
}
|
|
}
|
|
if (logging)
|
|
strncpy(curname, name, sizeof(curname)-1);
|
|
#ifdef SKEY
|
|
pwok = skeyaccess(name, NULL, remotehost, addr_string);
|
|
reply(331, "%s", skey_challenge(name, pw, pwok));
|
|
#else
|
|
reply(331, "Password required for %s.", name);
|
|
#endif
|
|
askpasswd = 1;
|
|
/*
|
|
* Delay before reading passwd after first failed
|
|
* attempt to slow down passwd-guessing programs.
|
|
*/
|
|
if (login_attempts)
|
|
sleep((unsigned) login_attempts);
|
|
}
|
|
|
|
/*
|
|
* Check if a user is in the file "fname"
|
|
*/
|
|
static int
|
|
checkuser(fname, name)
|
|
char *fname;
|
|
char *name;
|
|
{
|
|
FILE *fd;
|
|
int found = 0;
|
|
char *p, line[BUFSIZ];
|
|
|
|
if ((fd = fopen(fname, "r")) != NULL) {
|
|
while (fgets(line, sizeof(line), fd) != NULL)
|
|
if ((p = strchr(line, '\n')) != NULL) {
|
|
*p = '\0';
|
|
if (line[0] == '#')
|
|
continue;
|
|
if (strcmp(line, name) == 0) {
|
|
found = 1;
|
|
break;
|
|
}
|
|
}
|
|
(void) fclose(fd);
|
|
}
|
|
return (found);
|
|
}
|
|
|
|
/*
|
|
* Terminate login as previous user, if any, resetting state;
|
|
* used when USER command is given or login fails.
|
|
*/
|
|
static void
|
|
end_login()
|
|
{
|
|
|
|
(void) seteuid((uid_t)0);
|
|
if (logged_in)
|
|
logwtmp(ttyline, "", "");
|
|
pw = NULL;
|
|
logged_in = 0;
|
|
guest = 0;
|
|
dochroot = 0;
|
|
}
|
|
|
|
void
|
|
pass(passwd)
|
|
char *passwd;
|
|
{
|
|
int rval;
|
|
FILE *fd;
|
|
static char homedir[MAXPATHLEN];
|
|
|
|
if (logged_in || askpasswd == 0) {
|
|
reply(503, "Login with USER first.");
|
|
return;
|
|
}
|
|
askpasswd = 0;
|
|
if (!guest) { /* "ftp" is only account allowed no password */
|
|
if (pw == NULL) {
|
|
rval = 1; /* failure below */
|
|
goto skip;
|
|
}
|
|
#if defined(KERBEROS)
|
|
rval = klogin(pw, "", hostname, passwd);
|
|
if (rval == 0)
|
|
goto skip;
|
|
#endif
|
|
#ifdef SKEY
|
|
rval = strcmp(skey_crypt(passwd, pw->pw_passwd, pw, pwok),
|
|
pw->pw_passwd);
|
|
pwok = 0;
|
|
#else
|
|
rval = strcmp(crypt(passwd, pw->pw_passwd), pw->pw_passwd);
|
|
#endif
|
|
/* The strcmp does not catch null passwords! */
|
|
if (*pw->pw_passwd == '\0' ||
|
|
(pw->pw_expire && time(NULL) >= pw->pw_expire))
|
|
rval = 1; /* failure */
|
|
skip:
|
|
/*
|
|
* If rval == 1, the user failed the authentication check
|
|
* above. If rval == 0, either Kerberos or local authentication
|
|
* succeeded.
|
|
*/
|
|
if (rval) {
|
|
reply(530, "Login incorrect.");
|
|
if (logging)
|
|
syslog(LOG_NOTICE,
|
|
"FTP LOGIN FAILED FROM %s, %s",
|
|
remotehost, curname);
|
|
pw = NULL;
|
|
if (login_attempts++ >= 5) {
|
|
syslog(LOG_NOTICE,
|
|
"repeated login failures from %s",
|
|
remotehost);
|
|
exit(0);
|
|
}
|
|
return;
|
|
}
|
|
}
|
|
login_attempts = 0; /* this time successful */
|
|
if (setegid((gid_t)pw->pw_gid) < 0) {
|
|
reply(550, "Can't set gid.");
|
|
return;
|
|
}
|
|
(void) initgroups(pw->pw_name, pw->pw_gid);
|
|
|
|
/* open wtmp before chroot */
|
|
logwtmp(ttyline, pw->pw_name, remotehost);
|
|
logged_in = 1;
|
|
|
|
if (guest && stats && statfd < 0)
|
|
if ((statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND)) < 0)
|
|
stats = 0;
|
|
|
|
dochroot = checkuser(_PATH_FTPCHROOT, pw->pw_name);
|
|
if (guest) {
|
|
/*
|
|
* We MUST do a chdir() after the chroot. Otherwise
|
|
* the old current directory will be accessible as "."
|
|
* outside the new root!
|
|
*/
|
|
if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) {
|
|
reply(550, "Can't set guest privileges.");
|
|
goto bad;
|
|
}
|
|
} else if (dochroot) {
|
|
if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) {
|
|
reply(550, "Can't change root.");
|
|
goto bad;
|
|
}
|
|
} else if (chdir(pw->pw_dir) < 0) {
|
|
if (chdir("/") < 0) {
|
|
reply(530, "User %s: can't change directory to %s.",
|
|
pw->pw_name, pw->pw_dir);
|
|
goto bad;
|
|
} else
|
|
lreply(230, "No directory! Logging in with home=/");
|
|
}
|
|
if (seteuid((uid_t)pw->pw_uid) < 0) {
|
|
reply(550, "Can't set uid.");
|
|
goto bad;
|
|
}
|
|
|
|
/*
|
|
* Set home directory so that use of ~ (tilde) works correctly.
|
|
*/
|
|
if (getcwd(homedir, MAXPATHLEN) != NULL)
|
|
setenv("HOME", homedir, 1);
|
|
|
|
/*
|
|
* Display a login message, if it exists.
|
|
* N.B. reply(230,) must follow the message.
|
|
*/
|
|
if ((fd = fopen(_PATH_FTPLOGINMESG, "r")) != NULL) {
|
|
char *cp, line[LINE_MAX];
|
|
|
|
while (fgets(line, sizeof(line), fd) != NULL) {
|
|
if ((cp = strchr(line, '\n')) != NULL)
|
|
*cp = '\0';
|
|
lreply(230, "%s", line);
|
|
}
|
|
(void) fflush(stdout);
|
|
(void) fclose(fd);
|
|
}
|
|
if (guest) {
|
|
if (ident != NULL)
|
|
free(ident);
|
|
ident = strdup(passwd);
|
|
if (ident == NULL)
|
|
fatal("Ran out of memory.");
|
|
|
|
reply(230, "Guest login ok, access restrictions apply.");
|
|
#ifdef SETPROCTITLE
|
|
snprintf(proctitle, sizeof(proctitle),
|
|
"%s: anonymous/%.*s", remotehost,
|
|
sizeof(proctitle) - sizeof(remotehost) -
|
|
sizeof(": anonymous/"), passwd);
|
|
setproctitle("%s", proctitle);
|
|
#endif /* SETPROCTITLE */
|
|
if (logging)
|
|
syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s",
|
|
remotehost, passwd);
|
|
} else {
|
|
reply(230, "User %s logged in.", pw->pw_name);
|
|
#ifdef SETPROCTITLE
|
|
snprintf(proctitle, sizeof(proctitle),
|
|
"%s: %s", remotehost, pw->pw_name);
|
|
setproctitle("%s", proctitle);
|
|
#endif /* SETPROCTITLE */
|
|
if (logging)
|
|
syslog(LOG_INFO, "FTP LOGIN FROM %s as %s",
|
|
remotehost, pw->pw_name);
|
|
}
|
|
(void) umask(defumask);
|
|
return;
|
|
bad:
|
|
/* Forget all about it... */
|
|
end_login();
|
|
}
|
|
|
|
void
|
|
retrieve(cmd, name)
|
|
char *cmd, *name;
|
|
{
|
|
FILE *fin, *dout;
|
|
struct stat st;
|
|
int (*closefunc) __P((FILE *));
|
|
long start;
|
|
|
|
if (cmd == 0) {
|
|
fin = fopen(name, "r"), closefunc = fclose;
|
|
st.st_size = 0;
|
|
} else {
|
|
char line[BUFSIZ];
|
|
|
|
(void) sprintf(line, cmd, name), name = line;
|
|
fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose;
|
|
st.st_size = -1;
|
|
st.st_blksize = BUFSIZ;
|
|
}
|
|
if (fin == NULL) {
|
|
if (errno != 0) {
|
|
perror_reply(550, name);
|
|
if (cmd == 0) {
|
|
LOGCMD("get", name);
|
|
}
|
|
}
|
|
return;
|
|
}
|
|
byte_count = -1;
|
|
if (cmd == 0 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) {
|
|
reply(550, "%s: not a plain file.", name);
|
|
goto done;
|
|
}
|
|
if (restart_point) {
|
|
if (type == TYPE_A) {
|
|
off_t i, n;
|
|
int c;
|
|
|
|
n = restart_point;
|
|
i = 0;
|
|
while (i++ < n) {
|
|
if ((c=getc(fin)) == EOF) {
|
|
perror_reply(550, name);
|
|
goto done;
|
|
}
|
|
if (c == '\n')
|
|
i++;
|
|
}
|
|
} else if (lseek(fileno(fin), restart_point, L_SET) < 0) {
|
|
perror_reply(550, name);
|
|
goto done;
|
|
}
|
|
}
|
|
dout = dataconn(name, st.st_size, "w");
|
|
if (dout == NULL)
|
|
goto done;
|
|
time(&start);
|
|
send_data(fin, dout, st.st_blksize, st.st_size,
|
|
restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode));
|
|
if (cmd == 0 && guest && stats)
|
|
logxfer(name, st.st_size, start);
|
|
(void) fclose(dout);
|
|
data = -1;
|
|
pdata = -1;
|
|
done:
|
|
if (cmd == 0)
|
|
LOGBYTES("get", name, byte_count);
|
|
(*closefunc)(fin);
|
|
}
|
|
|
|
void
|
|
store(name, mode, unique)
|
|
char *name, *mode;
|
|
int unique;
|
|
{
|
|
FILE *fout, *din;
|
|
struct stat st;
|
|
int (*closefunc) __P((FILE *));
|
|
|
|
if ((unique || guest) && stat(name, &st) == 0 &&
|
|
(name = gunique(name)) == NULL) {
|
|
LOGCMD(*mode == 'w' ? "put" : "append", name);
|
|
return;
|
|
}
|
|
|
|
if (restart_point)
|
|
mode = "r+";
|
|
fout = fopen(name, mode);
|
|
closefunc = fclose;
|
|
if (fout == NULL) {
|
|
perror_reply(553, name);
|
|
LOGCMD(*mode == 'w' ? "put" : "append", name);
|
|
return;
|
|
}
|
|
byte_count = -1;
|
|
if (restart_point) {
|
|
if (type == TYPE_A) {
|
|
off_t i, n;
|
|
int c;
|
|
|
|
n = restart_point;
|
|
i = 0;
|
|
while (i++ < n) {
|
|
if ((c=getc(fout)) == EOF) {
|
|
perror_reply(550, name);
|
|
goto done;
|
|
}
|
|
if (c == '\n')
|
|
i++;
|
|
}
|
|
/*
|
|
* We must do this seek to "current" position
|
|
* because we are changing from reading to
|
|
* writing.
|
|
*/
|
|
if (fseek(fout, 0L, L_INCR) < 0) {
|
|
perror_reply(550, name);
|
|
goto done;
|
|
}
|
|
} else if (lseek(fileno(fout), restart_point, L_SET) < 0) {
|
|
perror_reply(550, name);
|
|
goto done;
|
|
}
|
|
}
|
|
din = dataconn(name, (off_t)-1, "r");
|
|
if (din == NULL)
|
|
goto done;
|
|
if (receive_data(din, fout) == 0) {
|
|
if (unique)
|
|
reply(226, "Transfer complete (unique file name:%s).",
|
|
name);
|
|
else
|
|
reply(226, "Transfer complete.");
|
|
}
|
|
(void) fclose(din);
|
|
data = -1;
|
|
pdata = -1;
|
|
done:
|
|
LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count);
|
|
(*closefunc)(fout);
|
|
}
|
|
|
|
static FILE *
|
|
getdatasock(mode)
|
|
char *mode;
|
|
{
|
|
int on = 1, s, t, tries;
|
|
|
|
if (data >= 0)
|
|
return (fdopen(data, mode));
|
|
(void) seteuid((uid_t)0);
|
|
s = socket(AF_INET, SOCK_STREAM, 0);
|
|
if (s < 0)
|
|
goto bad;
|
|
if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
|
|
(char *) &on, sizeof(on)) < 0)
|
|
goto bad;
|
|
/* anchor socket to avoid multi-homing problems */
|
|
data_source.sin_len = sizeof(struct sockaddr_in);
|
|
data_source.sin_family = AF_INET;
|
|
data_source.sin_addr = ctrl_addr.sin_addr;
|
|
for (tries = 1; ; tries++) {
|
|
if (bind(s, (struct sockaddr *)&data_source,
|
|
sizeof(data_source)) >= 0)
|
|
break;
|
|
if (errno != EADDRINUSE || tries > 10)
|
|
goto bad;
|
|
sleep(tries);
|
|
}
|
|
(void) seteuid((uid_t)pw->pw_uid);
|
|
#ifdef IP_TOS
|
|
on = IPTOS_THROUGHPUT;
|
|
if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0)
|
|
syslog(LOG_WARNING, "setsockopt (IP_TOS): %m");
|
|
#endif
|
|
#ifdef TCP_NOPUSH
|
|
/*
|
|
* Turn off push flag to keep sender TCP from sending short packets
|
|
* at the boundaries of each write(). Should probably do a SO_SNDBUF
|
|
* to set the send buffer size as well, but that may not be desirable
|
|
* in heavy-load situations.
|
|
*/
|
|
on = 1;
|
|
if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, (char *)&on, sizeof on) < 0)
|
|
syslog(LOG_WARNING, "setsockopt (TCP_NOPUSH): %m");
|
|
#endif
|
|
#ifdef SO_SNDBUF
|
|
on = 65536;
|
|
if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, (char *)&on, sizeof on) < 0)
|
|
syslog(LOG_WARNING, "setsockopt (SO_SNDBUF): %m");
|
|
#endif
|
|
|
|
return (fdopen(s, mode));
|
|
bad:
|
|
/* Return the real value of errno (close may change it) */
|
|
t = errno;
|
|
(void) seteuid((uid_t)pw->pw_uid);
|
|
(void) close(s);
|
|
errno = t;
|
|
return (NULL);
|
|
}
|
|
|
|
static FILE *
|
|
dataconn(name, size, mode)
|
|
char *name;
|
|
off_t size;
|
|
char *mode;
|
|
{
|
|
char sizebuf[32];
|
|
FILE *file;
|
|
int retry = 0, tos;
|
|
|
|
file_size = size;
|
|
byte_count = 0;
|
|
if (size != (off_t) -1)
|
|
(void) sprintf(sizebuf, " (%qd bytes)", size);
|
|
else
|
|
(void) strcpy(sizebuf, "");
|
|
if (pdata >= 0) {
|
|
struct sockaddr_in from;
|
|
int s, fromlen = sizeof(from);
|
|
struct timeval timeout;
|
|
fd_set set;
|
|
|
|
FD_ZERO(&set);
|
|
FD_SET(pdata, &set);
|
|
|
|
timeout.tv_usec = 0;
|
|
timeout.tv_sec = 120;
|
|
|
|
if (select(pdata+1, &set, (fd_set *) 0, (fd_set *) 0, &timeout) == 0 ||
|
|
(s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0) {
|
|
reply(425, "Can't open data connection.");
|
|
(void) close(pdata);
|
|
pdata = -1;
|
|
return (NULL);
|
|
}
|
|
(void) close(pdata);
|
|
pdata = s;
|
|
#ifdef IP_TOS
|
|
tos = IPTOS_THROUGHPUT;
|
|
(void) setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&tos,
|
|
sizeof(int));
|
|
#endif
|
|
reply(150, "Opening %s mode data connection for '%s'%s.",
|
|
type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf);
|
|
return (fdopen(pdata, mode));
|
|
}
|
|
if (data >= 0) {
|
|
reply(125, "Using existing data connection for '%s'%s.",
|
|
name, sizebuf);
|
|
usedefault = 1;
|
|
return (fdopen(data, mode));
|
|
}
|
|
if (usedefault)
|
|
data_dest = his_addr;
|
|
usedefault = 1;
|
|
file = getdatasock(mode);
|
|
if (file == NULL) {
|
|
reply(425, "Can't create data socket (%s,%d): %s.",
|
|
inet_ntoa(data_source.sin_addr),
|
|
ntohs(data_source.sin_port), strerror(errno));
|
|
return (NULL);
|
|
}
|
|
data = fileno(file);
|
|
while (connect(data, (struct sockaddr *)&data_dest,
|
|
sizeof(data_dest)) < 0) {
|
|
if (errno == EADDRINUSE && retry < swaitmax) {
|
|
sleep((unsigned) swaitint);
|
|
retry += swaitint;
|
|
continue;
|
|
}
|
|
perror_reply(425, "Can't build data connection");
|
|
(void) fclose(file);
|
|
data = -1;
|
|
return (NULL);
|
|
}
|
|
reply(150, "Opening %s mode data connection for '%s'%s.",
|
|
type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf);
|
|
return (file);
|
|
}
|
|
|
|
/*
|
|
* Tranfer the contents of "instr" to "outstr" peer using the appropriate
|
|
* encapsulation of the data subject to Mode, Structure, and Type.
|
|
*
|
|
* NB: Form isn't handled.
|
|
*/
|
|
static void
|
|
send_data(instr, outstr, blksize, filesize, isreg)
|
|
FILE *instr, *outstr;
|
|
off_t blksize;
|
|
off_t filesize;
|
|
int isreg;
|
|
{
|
|
int c, cnt, filefd, netfd;
|
|
char *buf, *bp;
|
|
size_t len;
|
|
|
|
transflag++;
|
|
if (setjmp(urgcatch)) {
|
|
transflag = 0;
|
|
return;
|
|
}
|
|
switch (type) {
|
|
|
|
case TYPE_A:
|
|
while ((c = getc(instr)) != EOF) {
|
|
byte_count++;
|
|
if (c == '\n') {
|
|
if (ferror(outstr))
|
|
goto data_err;
|
|
(void) putc('\r', outstr);
|
|
}
|
|
(void) putc(c, outstr);
|
|
}
|
|
fflush(outstr);
|
|
transflag = 0;
|
|
if (ferror(instr))
|
|
goto file_err;
|
|
if (ferror(outstr))
|
|
goto data_err;
|
|
reply(226, "Transfer complete.");
|
|
return;
|
|
|
|
case TYPE_I:
|
|
case TYPE_L:
|
|
/*
|
|
* isreg is only set if we are not doing restart and we
|
|
* are sending a regular file
|
|
*/
|
|
netfd = fileno(outstr);
|
|
filefd = fileno(instr);
|
|
|
|
if (isreg && filesize < (off_t)16 * 1024 * 1024) {
|
|
buf = mmap(0, filesize, PROT_READ, MAP_SHARED, filefd,
|
|
(off_t)0);
|
|
if (!buf) {
|
|
syslog(LOG_WARNING, "mmap(%lu): %m",
|
|
(unsigned long)filesize);
|
|
goto oldway;
|
|
}
|
|
bp = buf;
|
|
len = filesize;
|
|
do {
|
|
cnt = write(netfd, bp, len);
|
|
len -= cnt;
|
|
bp += cnt;
|
|
if (cnt > 0) byte_count += cnt;
|
|
} while(cnt > 0 && len > 0);
|
|
|
|
transflag = 0;
|
|
munmap(buf, (size_t)filesize);
|
|
if (cnt < 0)
|
|
goto data_err;
|
|
reply(226, "Transfer complete.");
|
|
return;
|
|
}
|
|
|
|
oldway:
|
|
if ((buf = malloc((u_int)blksize)) == NULL) {
|
|
transflag = 0;
|
|
perror_reply(451, "Local resource failure: malloc");
|
|
return;
|
|
}
|
|
|
|
while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 &&
|
|
write(netfd, buf, cnt) == cnt)
|
|
byte_count += cnt;
|
|
transflag = 0;
|
|
(void)free(buf);
|
|
if (cnt != 0) {
|
|
if (cnt < 0)
|
|
goto file_err;
|
|
goto data_err;
|
|
}
|
|
reply(226, "Transfer complete.");
|
|
return;
|
|
default:
|
|
transflag = 0;
|
|
reply(550, "Unimplemented TYPE %d in send_data", type);
|
|
return;
|
|
}
|
|
|
|
data_err:
|
|
transflag = 0;
|
|
perror_reply(426, "Data connection");
|
|
return;
|
|
|
|
file_err:
|
|
transflag = 0;
|
|
perror_reply(551, "Error on input file");
|
|
}
|
|
|
|
/*
|
|
* Transfer data from peer to "outstr" using the appropriate encapulation of
|
|
* the data subject to Mode, Structure, and Type.
|
|
*
|
|
* N.B.: Form isn't handled.
|
|
*/
|
|
static int
|
|
receive_data(instr, outstr)
|
|
FILE *instr, *outstr;
|
|
{
|
|
int c;
|
|
int cnt, bare_lfs;
|
|
char buf[BUFSIZ];
|
|
|
|
transflag++;
|
|
if (setjmp(urgcatch)) {
|
|
transflag = 0;
|
|
return (-1);
|
|
}
|
|
|
|
bare_lfs = 0;
|
|
|
|
switch (type) {
|
|
|
|
case TYPE_I:
|
|
case TYPE_L:
|
|
while ((cnt = read(fileno(instr), buf, sizeof(buf))) > 0) {
|
|
if (write(fileno(outstr), buf, cnt) != cnt)
|
|
goto file_err;
|
|
byte_count += cnt;
|
|
}
|
|
if (cnt < 0)
|
|
goto data_err;
|
|
transflag = 0;
|
|
return (0);
|
|
|
|
case TYPE_E:
|
|
reply(553, "TYPE E not implemented.");
|
|
transflag = 0;
|
|
return (-1);
|
|
|
|
case TYPE_A:
|
|
while ((c = getc(instr)) != EOF) {
|
|
byte_count++;
|
|
if (c == '\n')
|
|
bare_lfs++;
|
|
while (c == '\r') {
|
|
if (ferror(outstr))
|
|
goto data_err;
|
|
if ((c = getc(instr)) != '\n') {
|
|
(void) putc ('\r', outstr);
|
|
if (c == '\0' || c == EOF)
|
|
goto contin2;
|
|
}
|
|
}
|
|
(void) putc(c, outstr);
|
|
contin2: ;
|
|
}
|
|
fflush(outstr);
|
|
if (ferror(instr))
|
|
goto data_err;
|
|
if (ferror(outstr))
|
|
goto file_err;
|
|
transflag = 0;
|
|
if (bare_lfs) {
|
|
lreply(226,
|
|
"WARNING! %d bare linefeeds received in ASCII mode",
|
|
bare_lfs);
|
|
(void)printf(" File may not have transferred correctly.\r\n");
|
|
}
|
|
return (0);
|
|
default:
|
|
reply(550, "Unimplemented TYPE %d in receive_data", type);
|
|
transflag = 0;
|
|
return (-1);
|
|
}
|
|
|
|
data_err:
|
|
transflag = 0;
|
|
perror_reply(426, "Data Connection");
|
|
return (-1);
|
|
|
|
file_err:
|
|
transflag = 0;
|
|
perror_reply(452, "Error writing file");
|
|
return (-1);
|
|
}
|
|
|
|
void
|
|
statfilecmd(filename)
|
|
char *filename;
|
|
{
|
|
FILE *fin;
|
|
int c;
|
|
char line[LINE_MAX];
|
|
|
|
(void)snprintf(line, sizeof(line), "/bin/ls -lgA %s", filename);
|
|
fin = ftpd_popen(line, "r");
|
|
lreply(211, "status of %s:", filename);
|
|
while ((c = getc(fin)) != EOF) {
|
|
if (c == '\n') {
|
|
if (ferror(stdout)){
|
|
perror_reply(421, "control connection");
|
|
(void) ftpd_pclose(fin);
|
|
dologout(1);
|
|
/* NOTREACHED */
|
|
}
|
|
if (ferror(fin)) {
|
|
perror_reply(551, filename);
|
|
(void) ftpd_pclose(fin);
|
|
return;
|
|
}
|
|
(void) putc('\r', stdout);
|
|
}
|
|
(void) putc(c, stdout);
|
|
}
|
|
(void) ftpd_pclose(fin);
|
|
reply(211, "End of Status");
|
|
}
|
|
|
|
void
|
|
statcmd()
|
|
{
|
|
struct sockaddr_in *sin;
|
|
u_char *a, *p;
|
|
|
|
lreply(211, "%s FTP server status:", hostname, version);
|
|
printf(" %s\r\n", version);
|
|
printf(" Connected to %s", remotehost);
|
|
if (!isdigit(remotehost[0]))
|
|
printf(" (%s)", inet_ntoa(his_addr.sin_addr));
|
|
printf("\r\n");
|
|
if (logged_in) {
|
|
if (guest)
|
|
printf(" Logged in anonymously\r\n");
|
|
else
|
|
printf(" Logged in as %s\r\n", pw->pw_name);
|
|
} else if (askpasswd)
|
|
printf(" Waiting for password\r\n");
|
|
else
|
|
printf(" Waiting for user name\r\n");
|
|
printf(" TYPE: %s", typenames[type]);
|
|
if (type == TYPE_A || type == TYPE_E)
|
|
printf(", FORM: %s", formnames[form]);
|
|
if (type == TYPE_L)
|
|
#if NBBY == 8
|
|
printf(" %d", NBBY);
|
|
#else
|
|
printf(" %d", bytesize); /* need definition! */
|
|
#endif
|
|
printf("; STRUcture: %s; transfer MODE: %s\r\n",
|
|
strunames[stru], modenames[mode]);
|
|
if (data != -1)
|
|
printf(" Data connection open\r\n");
|
|
else if (pdata != -1) {
|
|
printf(" in Passive mode");
|
|
sin = &pasv_addr;
|
|
goto printaddr;
|
|
} else if (usedefault == 0) {
|
|
printf(" PORT");
|
|
sin = &data_dest;
|
|
printaddr:
|
|
a = (u_char *) &sin->sin_addr;
|
|
p = (u_char *) &sin->sin_port;
|
|
#define UC(b) (((int) b) & 0xff)
|
|
printf(" (%d,%d,%d,%d,%d,%d)\r\n", UC(a[0]),
|
|
UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1]));
|
|
#undef UC
|
|
} else
|
|
printf(" No data connection\r\n");
|
|
reply(211, "End of status");
|
|
}
|
|
|
|
void
|
|
fatal(s)
|
|
char *s;
|
|
{
|
|
|
|
reply(451, "Error in server: %s\n", s);
|
|
reply(221, "Closing connection due to server error.");
|
|
dologout(0);
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
void
|
|
#if __STDC__
|
|
reply(int n, const char *fmt, ...)
|
|
#else
|
|
reply(n, fmt, va_alist)
|
|
int n;
|
|
char *fmt;
|
|
va_dcl
|
|
#endif
|
|
{
|
|
va_list ap;
|
|
#if __STDC__
|
|
va_start(ap, fmt);
|
|
#else
|
|
va_start(ap);
|
|
#endif
|
|
(void)printf("%d ", n);
|
|
(void)vprintf(fmt, ap);
|
|
(void)printf("\r\n");
|
|
(void)fflush(stdout);
|
|
if (debug) {
|
|
syslog(LOG_DEBUG, "<--- %d ", n);
|
|
vsyslog(LOG_DEBUG, fmt, ap);
|
|
}
|
|
}
|
|
|
|
void
|
|
#if __STDC__
|
|
lreply(int n, const char *fmt, ...)
|
|
#else
|
|
lreply(n, fmt, va_alist)
|
|
int n;
|
|
char *fmt;
|
|
va_dcl
|
|
#endif
|
|
{
|
|
va_list ap;
|
|
#if __STDC__
|
|
va_start(ap, fmt);
|
|
#else
|
|
va_start(ap);
|
|
#endif
|
|
(void)printf("%d- ", n);
|
|
(void)vprintf(fmt, ap);
|
|
(void)printf("\r\n");
|
|
(void)fflush(stdout);
|
|
if (debug) {
|
|
syslog(LOG_DEBUG, "<--- %d- ", n);
|
|
vsyslog(LOG_DEBUG, fmt, ap);
|
|
}
|
|
}
|
|
|
|
static void
|
|
ack(s)
|
|
char *s;
|
|
{
|
|
|
|
reply(250, "%s command successful.", s);
|
|
}
|
|
|
|
void
|
|
nack(s)
|
|
char *s;
|
|
{
|
|
|
|
reply(502, "%s command not implemented.", s);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
void
|
|
yyerror(s)
|
|
char *s;
|
|
{
|
|
char *cp;
|
|
|
|
if ((cp = strchr(cbuf,'\n')))
|
|
*cp = '\0';
|
|
reply(500, "'%s': command not understood.", cbuf);
|
|
}
|
|
|
|
void
|
|
delete(name)
|
|
char *name;
|
|
{
|
|
struct stat st;
|
|
|
|
LOGCMD("delete", name);
|
|
if (stat(name, &st) < 0) {
|
|
perror_reply(550, name);
|
|
return;
|
|
}
|
|
if ((st.st_mode&S_IFMT) == S_IFDIR) {
|
|
if (rmdir(name) < 0) {
|
|
perror_reply(550, name);
|
|
return;
|
|
}
|
|
goto done;
|
|
}
|
|
if (unlink(name) < 0) {
|
|
perror_reply(550, name);
|
|
return;
|
|
}
|
|
done:
|
|
ack("DELE");
|
|
}
|
|
|
|
void
|
|
cwd(path)
|
|
char *path;
|
|
{
|
|
|
|
if (chdir(path) < 0)
|
|
perror_reply(550, path);
|
|
else
|
|
ack("CWD");
|
|
}
|
|
|
|
void
|
|
makedir(name)
|
|
char *name;
|
|
{
|
|
|
|
LOGCMD("mkdir", name);
|
|
if (mkdir(name, 0777) < 0)
|
|
perror_reply(550, name);
|
|
else
|
|
reply(257, "MKD command successful.");
|
|
}
|
|
|
|
void
|
|
removedir(name)
|
|
char *name;
|
|
{
|
|
|
|
LOGCMD("rmdir", name);
|
|
if (rmdir(name) < 0)
|
|
perror_reply(550, name);
|
|
else
|
|
ack("RMD");
|
|
}
|
|
|
|
void
|
|
pwd()
|
|
{
|
|
char path[MAXPATHLEN + 1];
|
|
|
|
if (getwd(path) == (char *)NULL)
|
|
reply(550, "%s.", path);
|
|
else
|
|
reply(257, "\"%s\" is current directory.", path);
|
|
}
|
|
|
|
char *
|
|
renamefrom(name)
|
|
char *name;
|
|
{
|
|
struct stat st;
|
|
|
|
if (stat(name, &st) < 0) {
|
|
perror_reply(550, name);
|
|
return ((char *)0);
|
|
}
|
|
reply(350, "File exists, ready for destination name");
|
|
return (name);
|
|
}
|
|
|
|
void
|
|
renamecmd(from, to)
|
|
char *from, *to;
|
|
{
|
|
struct stat st;
|
|
|
|
LOGCMD2("rename", from, to);
|
|
|
|
if (guest && (stat(to, &st) == 0)) {
|
|
reply(550, "%s: permission denied", to);
|
|
return;
|
|
}
|
|
|
|
if (rename(from, to) < 0)
|
|
perror_reply(550, "rename");
|
|
else
|
|
ack("RNTO");
|
|
}
|
|
|
|
static void
|
|
dolog(sin)
|
|
struct sockaddr_in *sin;
|
|
{
|
|
struct hostent *hp = gethostbyaddr((char *)&sin->sin_addr,
|
|
sizeof(struct in_addr), AF_INET);
|
|
|
|
if (hp)
|
|
(void) strncpy(remotehost, hp->h_name, sizeof(remotehost));
|
|
else
|
|
(void) strncpy(remotehost, inet_ntoa(sin->sin_addr),
|
|
sizeof(remotehost));
|
|
#ifdef SETPROCTITLE
|
|
snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost);
|
|
setproctitle("%s", proctitle);
|
|
#endif /* SETPROCTITLE */
|
|
|
|
if (logging)
|
|
syslog(LOG_INFO, "connection from %s", remotehost);
|
|
}
|
|
|
|
/*
|
|
* Record logout in wtmp file
|
|
* and exit with supplied status.
|
|
*/
|
|
void
|
|
dologout(status)
|
|
int status;
|
|
{
|
|
|
|
if (logged_in) {
|
|
(void) seteuid((uid_t)0);
|
|
logwtmp(ttyline, "", "");
|
|
#if defined(KERBEROS)
|
|
if (!notickets && krbtkfile_env)
|
|
unlink(krbtkfile_env);
|
|
#endif
|
|
}
|
|
/* beware of flushing buffers after a SIGPIPE */
|
|
_exit(status);
|
|
}
|
|
|
|
static void
|
|
myoob(signo)
|
|
int signo;
|
|
{
|
|
char *cp;
|
|
|
|
/* only process if transfer occurring */
|
|
if (!transflag)
|
|
return;
|
|
cp = tmpline;
|
|
if (getline(cp, 7, stdin) == NULL) {
|
|
reply(221, "You could at least say goodbye.");
|
|
dologout(0);
|
|
}
|
|
upper(cp);
|
|
if (strcmp(cp, "ABOR\r\n") == 0) {
|
|
tmpline[0] = '\0';
|
|
reply(426, "Transfer aborted. Data connection closed.");
|
|
reply(226, "Abort successful");
|
|
longjmp(urgcatch, 1);
|
|
}
|
|
if (strcmp(cp, "STAT\r\n") == 0) {
|
|
if (file_size != (off_t) -1)
|
|
reply(213, "Status: %qd of %qd bytes transferred",
|
|
byte_count, file_size);
|
|
else
|
|
reply(213, "Status: %qd bytes transferred", byte_count);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Note: a response of 425 is not mentioned as a possible response to
|
|
* the PASV command in RFC959. However, it has been blessed as
|
|
* a legitimate response by Jon Postel in a telephone conversation
|
|
* with Rick Adams on 25 Jan 89.
|
|
*/
|
|
void
|
|
passive()
|
|
{
|
|
int len;
|
|
char *p, *a;
|
|
|
|
if (pdata >= 0) /* close old port if one set */
|
|
close(pdata);
|
|
|
|
pdata = socket(AF_INET, SOCK_STREAM, 0);
|
|
if (pdata < 0) {
|
|
perror_reply(425, "Can't open passive connection");
|
|
return;
|
|
}
|
|
|
|
(void) seteuid((uid_t)0);
|
|
|
|
#ifdef IP_PORTRANGE
|
|
{
|
|
int on = restricted_data_ports ? IP_PORTRANGE_HIGH
|
|
: IP_PORTRANGE_DEFAULT;
|
|
|
|
if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE,
|
|
(char *)&on, sizeof(on)) < 0)
|
|
goto pasv_error;
|
|
}
|
|
#endif
|
|
|
|
pasv_addr = ctrl_addr;
|
|
pasv_addr.sin_port = 0;
|
|
if (bind(pdata, (struct sockaddr *)&pasv_addr,
|
|
sizeof(pasv_addr)) < 0)
|
|
goto pasv_error;
|
|
|
|
(void) seteuid((uid_t)pw->pw_uid);
|
|
|
|
len = sizeof(pasv_addr);
|
|
if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0)
|
|
goto pasv_error;
|
|
if (listen(pdata, 1) < 0)
|
|
goto pasv_error;
|
|
a = (char *) &pasv_addr.sin_addr;
|
|
p = (char *) &pasv_addr.sin_port;
|
|
|
|
#define UC(b) (((int) b) & 0xff)
|
|
|
|
reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]),
|
|
UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1]));
|
|
return;
|
|
|
|
pasv_error:
|
|
(void) seteuid((uid_t)pw->pw_uid);
|
|
(void) close(pdata);
|
|
pdata = -1;
|
|
perror_reply(425, "Can't open passive connection");
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Generate unique name for file with basename "local".
|
|
* The file named "local" is already known to exist.
|
|
* Generates failure reply on error.
|
|
*/
|
|
static char *
|
|
gunique(local)
|
|
char *local;
|
|
{
|
|
static char new[MAXPATHLEN];
|
|
struct stat st;
|
|
int count;
|
|
char *cp;
|
|
|
|
cp = strrchr(local, '/');
|
|
if (cp)
|
|
*cp = '\0';
|
|
if (stat(cp ? local : ".", &st) < 0) {
|
|
perror_reply(553, cp ? local : ".");
|
|
return ((char *) 0);
|
|
}
|
|
if (cp)
|
|
*cp = '/';
|
|
(void) snprintf(new, sizeof(new), "%s", local);
|
|
cp = new + strlen(new);
|
|
*cp++ = '.';
|
|
for (count = 1; count < 100; count++) {
|
|
(void)sprintf(cp, "%d", count);
|
|
if (stat(new, &st) < 0)
|
|
return (new);
|
|
}
|
|
reply(452, "Unique file name cannot be created.");
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* Format and send reply containing system error number.
|
|
*/
|
|
void
|
|
perror_reply(code, string)
|
|
int code;
|
|
char *string;
|
|
{
|
|
|
|
reply(code, "%s: %s.", string, strerror(errno));
|
|
}
|
|
|
|
static char *onefile[] = {
|
|
"",
|
|
0
|
|
};
|
|
|
|
void
|
|
send_file_list(whichf)
|
|
char *whichf;
|
|
{
|
|
struct stat st;
|
|
DIR *dirp = NULL;
|
|
struct dirent *dir;
|
|
FILE *dout = NULL;
|
|
char **dirlist, *dirname;
|
|
int simple = 0;
|
|
int freeglob = 0;
|
|
glob_t gl;
|
|
|
|
if (strpbrk(whichf, "~{[*?") != NULL) {
|
|
int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE;
|
|
|
|
memset(&gl, 0, sizeof(gl));
|
|
freeglob = 1;
|
|
if (glob(whichf, flags, 0, &gl)) {
|
|
reply(550, "not found");
|
|
goto out;
|
|
} else if (gl.gl_pathc == 0) {
|
|
errno = ENOENT;
|
|
perror_reply(550, whichf);
|
|
goto out;
|
|
}
|
|
dirlist = gl.gl_pathv;
|
|
} else {
|
|
onefile[0] = whichf;
|
|
dirlist = onefile;
|
|
simple = 1;
|
|
}
|
|
|
|
if (setjmp(urgcatch)) {
|
|
transflag = 0;
|
|
goto out;
|
|
}
|
|
while ((dirname = *dirlist++)) {
|
|
if (stat(dirname, &st) < 0) {
|
|
/*
|
|
* If user typed "ls -l", etc, and the client
|
|
* used NLST, do what the user meant.
|
|
*/
|
|
if (dirname[0] == '-' && *dirlist == NULL &&
|
|
transflag == 0) {
|
|
retrieve("/bin/ls %s", dirname);
|
|
goto out;
|
|
}
|
|
perror_reply(550, whichf);
|
|
if (dout != NULL) {
|
|
(void) fclose(dout);
|
|
transflag = 0;
|
|
data = -1;
|
|
pdata = -1;
|
|
}
|
|
goto out;
|
|
}
|
|
|
|
if (S_ISREG(st.st_mode)) {
|
|
if (dout == NULL) {
|
|
dout = dataconn("file list", (off_t)-1, "w");
|
|
if (dout == NULL)
|
|
goto out;
|
|
transflag++;
|
|
}
|
|
fprintf(dout, "%s%s\n", dirname,
|
|
type == TYPE_A ? "\r" : "");
|
|
byte_count += strlen(dirname) + 1;
|
|
continue;
|
|
} else if (!S_ISDIR(st.st_mode))
|
|
continue;
|
|
|
|
if ((dirp = opendir(dirname)) == NULL)
|
|
continue;
|
|
|
|
while ((dir = readdir(dirp)) != NULL) {
|
|
char nbuf[MAXPATHLEN];
|
|
|
|
if (dir->d_name[0] == '.' && dir->d_namlen == 1)
|
|
continue;
|
|
if (dir->d_name[0] == '.' && dir->d_name[1] == '.' &&
|
|
dir->d_namlen == 2)
|
|
continue;
|
|
|
|
sprintf(nbuf, "%s/%s", dirname, dir->d_name);
|
|
|
|
/*
|
|
* We have to do a stat to insure it's
|
|
* not a directory or special file.
|
|
*/
|
|
if (simple || (stat(nbuf, &st) == 0 &&
|
|
S_ISREG(st.st_mode))) {
|
|
if (dout == NULL) {
|
|
dout = dataconn("file list", (off_t)-1,
|
|
"w");
|
|
if (dout == NULL)
|
|
goto out;
|
|
transflag++;
|
|
}
|
|
if (nbuf[0] == '.' && nbuf[1] == '/')
|
|
fprintf(dout, "%s%s\n", &nbuf[2],
|
|
type == TYPE_A ? "\r" : "");
|
|
else
|
|
fprintf(dout, "%s%s\n", nbuf,
|
|
type == TYPE_A ? "\r" : "");
|
|
byte_count += strlen(nbuf) + 1;
|
|
}
|
|
}
|
|
(void) closedir(dirp);
|
|
}
|
|
|
|
if (dout == NULL)
|
|
reply(550, "No files found.");
|
|
else if (ferror(dout) != 0)
|
|
perror_reply(550, "Data connection");
|
|
else
|
|
reply(226, "Transfer complete.");
|
|
|
|
transflag = 0;
|
|
if (dout != NULL)
|
|
(void) fclose(dout);
|
|
data = -1;
|
|
pdata = -1;
|
|
out:
|
|
if (freeglob) {
|
|
freeglob = 0;
|
|
globfree(&gl);
|
|
}
|
|
}
|
|
|
|
void
|
|
reapchild(signo)
|
|
int signo;
|
|
{
|
|
while (wait3(NULL, WNOHANG, NULL) > 0);
|
|
}
|
|
|
|
#ifdef OLD_SETPROCTITLE
|
|
/*
|
|
* Clobber argv so ps will show what we're doing. (Stolen from sendmail.)
|
|
* Warning, since this is usually started from inetd.conf, it often doesn't
|
|
* have much of an environment or arglist to overwrite.
|
|
*/
|
|
void
|
|
#if __STDC__
|
|
setproctitle(const char *fmt, ...)
|
|
#else
|
|
setproctitle(fmt, va_alist)
|
|
char *fmt;
|
|
va_dcl
|
|
#endif
|
|
{
|
|
int i;
|
|
va_list ap;
|
|
char *p, *bp, ch;
|
|
char buf[LINE_MAX];
|
|
|
|
#if __STDC__
|
|
va_start(ap, fmt);
|
|
#else
|
|
va_start(ap);
|
|
#endif
|
|
(void)vsnprintf(buf, sizeof(buf), fmt, ap);
|
|
|
|
/* make ps print our process name */
|
|
p = Argv[0];
|
|
*p++ = '-';
|
|
|
|
i = strlen(buf);
|
|
if (i > LastArgv - p - 2) {
|
|
i = LastArgv - p - 2;
|
|
buf[i] = '\0';
|
|
}
|
|
bp = buf;
|
|
while (ch = *bp++)
|
|
if (ch != '\n' && ch != '\r')
|
|
*p++ = ch;
|
|
while (p < LastArgv)
|
|
*p++ = ' ';
|
|
}
|
|
#endif /* OLD_SETPROCTITLE */
|
|
|
|
static void
|
|
logxfer(name, size, start)
|
|
char *name;
|
|
long size;
|
|
long start;
|
|
{
|
|
char buf[1024];
|
|
char path[MAXPATHLEN + 1];
|
|
long now;
|
|
|
|
if (statfd >= 0 && getwd(path) != NULL) {
|
|
time(&now);
|
|
snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s/%s!%ld!%ld\n",
|
|
ctime(&now)+4, ident, remotehost,
|
|
path, name, size, now - start + (now == start));
|
|
write(statfd, buf, strlen(buf));
|
|
}
|
|
}
|