linux-ftpd-0.17.tar.gz

/* * Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ /* * From: @(#)ftpd.c 8.4 (Berkeley) 4/16/94 * From: NetBSD: ftpd.c,v 1.15 1995/06/03 22:46:47 mycroft Exp * From: OpenBSD: ftpd.c,v 1.26 1996/12/07 09:00:22 bitblt Exp * From: OpenBSD: ftpd.c,v 1.35 1997/05/01 14:45:37 deraadt Exp * From: OpenBSD: ftpd.c,v 1.54 1999/04/29 21:38:43 downsj Exp */ char ftpd_rcsid[] = "$Id: ftpd.c,v 1.20 2000/07/23 03:34:56 dholland Exp $"; char copyright[] = "@(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994\n" " The Regents of the University of California. All rights reserved.\n"; /* * FTP server. */ #ifdef __linux__ #define _GNU_SOURCE #endif #include <sys/types.h> #include <sys/param.h> #include <sys/stat.h> #include <sys/ioctl.h> #include <sys/socket.h> #include <sys/wait.h> #include <sys/mman.h> #include <netinet/in.h> #include <netinet/ip.h> #include <netinet/tcp.h> #define FTP_NAMES #include <arpa/ftp.h> #include <arpa/inet.h> #include <arpa/telnet.h> #include <ctype.h> #include <dirent.h> #include <errno.h> #include <fcntl.h> #include <glob.h> #include <limits.h> /* for CHAR_BIT */ #include <netdb.h> #include <pwd.h> #include <setjmp.h> #include <signal.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <syslog.h> #include <time.h> #include <vis.h> #include <unistd.h> #include <utmp.h> #ifndef __linux__ #include <util.h> #include <err.h> #else #include <grp.h> /* for initgroups() */ /* #include <sys/file.h> * for L_SET et al. * <--- not used? */ /*typedef int64_t quad_t;*/ typedef unsigned int useconds_t; #endif #include "../version.h" /* glibc 2.[01] does not have TCP_CORK, so define it here */ #if __GLIBC__ >= 2 && defined(__linux__) && !defined(TCP_CORK) #define TCP_CORK 3 #endif #ifndef MAP_FAILED #define MAP_FAILED ((void *)-1) #endif #ifdef USE_SHADOW #include <shadow.h> #include "isexpired.h" #endif #if defined(TCPWRAPPERS) #include <tcpd.h> #endif /* TCPWRAPPERS */ #if defined(SKEY) #include <skey.h> #endif #include "pathnames.h" #include "extern.h" #ifdef __STDC__ #include <stdarg.h> #else #include <varargs.h> #endif static char versionpre[] = "Version 6.4/OpenBSD/Linux"; static char version[sizeof(versionpre)+sizeof(pkg)]; extern off_t restart_point; extern char cbuf[]; struct sockaddr_in server_addr; struct sockaddr_in ctrl_addr; struct sockaddr_in data_source; struct sockaddr_in data_dest; struct sockaddr_in his_addr; struct sockaddr_in pasv_addr; int daemon_mode = 0; int data; jmp_buf errcatch, urgcatch; int logged_in; struct passwd *pw; #ifdef USE_SHADOW struct spwd *spw = NULL; #endif int debug = 0; int timeout = 900; /* timeout after 15 minutes of inactivity */ int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ int logging; int high_data_ports = 0; int anon_only = 0; int multihome = 0; int guest; int stats; int statfd = -1; int portcheck = 1; int dochroot; int type; int form; int stru; /* avoid C keyword */ int mode; int doutmp = 0; /* update utmp file */ int usedefault = 1; /* for data transfers */ int pdata = -1; /* for passive mode */ sig_atomic_t transflag; off_t file_size; off_t byte_count; #if !defined(CMASK) || CMASK == 0 #undef CMASK #define CMASK 027 #endif int defumask = CMASK; /* default umask value */ char tmpline[7]; char hostname[MAXHOSTNAMELEN]; char remotehost[MAXHOSTNAMELEN]; char dhostname[MAXHOSTNAMELEN]; char *guestpw; static char ttyline[20]; char *tty = ttyline; /* for klogin */ static struct utmp utmp; /* for utmp */ #if defined(TCPWRAPPERS) int allow_severity = LOG_INFO; int deny_severity = LOG_NOTICE; #endif /* TCPWRAPPERS */ #if defined(KERBEROS) int notickets = 1; char *krbtkfile_env = NULL; #endif char *ident = NULL; /* * Timeout intervals for retrying connections * to hosts that don't accept PORT cmds. This * is a kludge, but given the problems with TCP... */ #define SWAITMAX 90 /* wait at most 90 seconds */ #define SWAITINT 5 /* interval between retries */ int swaitmax = SWAITMAX; int swaitint = SWAITINT; #ifdef HASSETPROCTITLE char proctitle[BUFSIZ]; /* initial part of title */ #endif /* HASSETPROCTITLE */ #define LOGCMD(cmd, file) \ if (logging > 1) \ syslog(LOG_INFO,"%s %s%s", cmd, \ *(file) == '/' ? "" : curdir(), file); #define LOGCMD2(cmd, file1, file2) \ if (logging > 1) \ syslog(LOG_INFO,"%s %s%s %s%s", cmd, \ *(file1) == '/' ? "" : curdir(), file1, \ *(file2) == '/' ? "" : curdir(), file2); #define LOGBYTES(cmd, file, cnt) \ if (logging > 1) { \ if (cnt == (off_t)-1) \ syslog(LOG_INFO,"%s %s%s", cmd, \ *(file) == '/' ? "" : curdir(), file); \ else \ syslog(LOG_INFO, "%s %s%s = %qd bytes", cmd, \ *(file) == '/' ? "" : curdir(), file, (quad_t)(cnt)); \ } static void ack __P((const char *)); static void myoob __P((int)); static int checkuser __P((const char *, const char *)); static FILE *dataconn __P((const char *, off_t, const char *)); static void dolog __P((struct sockaddr_in *)); static const char *curdir __P((void)); static void end_login __P((void)); static FILE *getdatasock __P((const char *)); static int guniquefd __P((const char *, char **)); static void lostconn __P((int)); static void sigquit __P((int)); static int receive_data __P((FILE *, FILE *)); static void replydirname __P((const char *, const char *)); static void send_data __P((FILE *, FILE *, off_t, off_t, int)); static struct passwd * sgetpwnam __P((const char *)); static char *sgetsave __P((char *)); static void reapchild __P((int)); #if defined(TCPWRAPPERS) static int check_host __P((struct sockaddr_in *)); #endif void logxfer __P((const char *, off_t, time_t)); #ifdef __linux__ static void warnx(const char *format, ...) { va_list ap; va_start(ap, format); fprintf(stderr, "ftpd: "); vfprintf(stderr, format, ap); fprintf(stderr, "\n"); va_end(ap); } #endif /* __linux__ */ static const char * curdir(void) { static char path[MAXPATHLEN+1]; /* path + '/' */ if (getcwd(path, sizeof(path)-1) == NULL) return (""); if (path[1] != '\0') /* special case for root dir. */ strcat(path, "/"); /* For guest account, skip / since it's chrooted */ return (guest ? path+1 : path); } int