check for innetgr

[heimdal.git] / appl / ftp / ftpd / ftpd.c

/*
 * 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.
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
RCSID("$Id$");
#endif

/*
 * FTP server.
 */
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#if defined(HAVE_SYS_IOCTL_H) && SunOS != 4
#include <sys/ioctl.h>
#endif
#ifdef TIME_WITH_SYS_TIME
#include <sys/time.h>
#include <time.h>
#elif defined(HAVE_SYS_TIME_H)
#include <sys/time.h>
#else
#include <time.h>
#endif
#ifdef HAVE_SYS_RESOURCE_H
#include <sys/resource.h>
#endif
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif

#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_NETINET_IN_SYSTM_H
#include <netinet/in_systm.h>
#endif
#ifdef HAVE_NETINET_IP_H
#include <netinet/ip.h>
#endif

#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif

#define FTP_NAMES
#include <arpa/ftp.h>
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef HAVE_ARPA_TELNET_H
#include <arpa/telnet.h>
#endif

#include <ctype.h>
#ifdef HAVE_DIRENT_H
#include <dirent.h>
#endif
#include <errno.h>
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#include <glob.h>
#include <limits.h>
#ifdef HAVE_PWD_H
#include <pwd.h>
#endif
#include <setjmp.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#ifdef HAVE_SYSLOG_H
#include <syslog.h>
#endif
#include <time.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_GRP_H
#include <grp.h>
#endif

#include <err.h>

#include "pathnames.h"
#include "extern.h"
#include "common.h"

#include "auth.h"

#include <krb.h>

#include <kafs.h>
#include "roken.h"

#ifdef OTP
#include <otp.h>
#endif

#ifdef SOCKS
#include <socks.h>
extern int LIBPREFIX(fclose)      __P((FILE *));
#endif

void yyparse();

#ifndef LOG_FTP
#define LOG_FTP LOG_DAEMON
#endif

static char version[] = "Version 6.00";

extern  off_t restart_point;
extern  char cbuf[];

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     data;
jmp_buf errcatch, urgcatch;
int     oobflag;
int     logged_in;
struct  passwd *pw;
int     debug = 0;
int     ftpd_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     guest;
int     dochroot;
int     type;
int     form;
int     stru;                   /* avoid C keyword */
int     mode;
int     usedefault = 1;         /* for data transfers */
int     pdata = -1;             /* for passive mode */
int     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 */
int     guest_umask = 0777;     /* Paranoia for anonymous users */
char    tmpline[10240];
char    hostname[MaxHostNameLen];
char    remotehost[MaxHostNameLen];
static char ttyline[20];

#define AUTH_PLAIN      (1 << 0) /* allow sending passwords */
#define AUTH_OTP        (1 << 1) /* passwords are one-time */
#define AUTH_FTP        (1 << 2) /* allow anonymous login */

static int auth_level = 0; /* Only allow kerberos login by default */

/*
 * 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 HAVE_SETPROCTITLE
char    proctitle[BUFSIZ];      /* initial part of title */
#endif /* HAVE_SETPROCTITLE */

#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 = %ld bytes", \
                        cmd, (*(file) == '/') ? "" : curdir(), file, (long)cnt); \
        }

static void      ack (char *);
static void      myoob (int);
static int       checkuser (char *, char *);
static int       checkaccess (char *);
static FILE     *dataconn (char *, off_t, char *);
static void      dolog (struct sockaddr_in *);
static void      end_login (void);
static FILE     *getdatasock (char *);
static char     *gunique (char *);
static RETSIGTYPE        lostconn (int);
static int       receive_data (FILE *, FILE *);
static void      send_data (FILE *, FILE *);
static struct passwd * sgetpwnam (char *);
static void      usage(void);

static char *
curdir(void)
{
        static char path[MaxPathLen+1+1];       /* path + '/' + '\0' */

        if (getcwd(path, sizeof(path)-2) == 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);
}

#ifndef LINE_MAX
#define LINE_MAX 1024
#endif

static int
parse_auth_level(char *str)
{
    char *p;
    int ret = 0;
    char *foo = NULL;

    for(p = strtok_r(str, ",", &foo);
        p;
        p = strtok_r(NULL, ",", &foo)) {
        if(strcmp(p, "user") == 0)
            ;
#ifdef OTP
        else if(strcmp(p, "otp") == 0)
            ret |= AUTH_PLAIN|AUTH_OTP;
#endif
        else if(strcmp(p, "ftp") == 0 ||
                strcmp(p, "safe") == 0)
            ret |= AUTH_FTP;
        else if(strcmp(p, "plain") == 0)
            ret |= AUTH_PLAIN;
        else if(strcmp(p, "none") == 0)
            ret |= AUTH_PLAIN|AUTH_FTP;
        else
            warnx("bad value for -a: `%s'", p);
    }
    return ret;     
}

/*
 * Print usage and die.
 */

static void
usage (void)
{
    fprintf (stderr,
             "Usage: %s [-d] [-i] [-g guest_umask] [-l] [-p port]"
             " [-t timeout] [-T max_timeout] [-u umask] [-v]"
             " [-a auth_level] \n",
             __progname);
    exit (1);
}

int
main(int argc, char **argv)
{
        int addrlen, ch, on = 1, tos;
        char *cp, line[LINE_MAX];
        FILE *fd;
        int not_inetd = 0;
        int port;
        struct servent *sp;
        char tkfile[1024];

        set_progname (argv[0]);

        /* detach from any tickets and tokens */

        snprintf(tkfile, sizeof(tkfile),
                 "/tmp/ftp_%u", (unsigned)getpid());
        krb_set_tkt_string(tkfile);
        if(k_hasafs())
            k_setpag();

        sp = getservbyname("ftp", "tcp");
        if(sp)
            port = sp->s_port;
        else
            port = htons(21);

        while ((ch = getopt(argc, argv, "a:dg:ilp:t:T:u:v")) != EOF) {
                switch (ch) {
                case 'a':
                    auth_level = parse_auth_level(optarg);
                    break;
                case 'd':
                    debug = 1;
                    break;

                case 'i':
                    not_inetd = 1;
                    break;
                case 'g':
                    {
                        long val = 0;

                        val = strtol(optarg, &optarg, 8);
                        if (*optarg != '\0' || val < 0)
                            warnx("bad value for -g");
                        else
                            guest_umask = val;
                        break;
                    }
                case 'l':
                    logging++;  /* > 1 == extra logging */
                    break;

                case 'p':
                    sp = getservbyname(optarg, "tcp");
                    if(sp)
                        port = sp->s_port;
                    else
                        if(isdigit(optarg[0]))
                            port = htons(atoi(optarg));
                        else
                            warnx("bad value for -p");
                    break;
                    
                case 't':
                    ftpd_timeout = atoi(optarg);
                    if (maxtimeout < ftpd_timeout)
                        maxtimeout = ftpd_timeout;
                    break;

                case 'T':
                    maxtimeout = atoi(optarg);
                    if (ftpd_timeout > maxtimeout)
                        ftpd_timeout = maxtimeout;
                    break;

                case 'u':
                    {
                        long val = 0;

                        val = strtol(optarg, &optarg, 8);
                        if (*optarg != '\0' || val < 0)
                            warnx("bad value for -u");
                        else
                            defumask = val;
                        break;
                    }

                case 'v':
                    debug = 1;
                    break;

                default:
                    usage ();
                }
        }

        if(not_inetd)
            mini_inetd (port);

        /*
         * LOG_NDELAY sets up the logging connection immediately,
         * necessary for anonymous ftp's that chroot and can't do it later.
         */
        openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP);
        addrlen = sizeof(his_addr);
        if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) {
                syslog(LOG_ERR, "getpeername (%s): %m",argv[0]);
                exit(1);
        }
        addrlen = sizeof(ctrl_addr);
        if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) {
                syslog(LOG_ERR, "getsockname (%s): %m",argv[0]);
                exit(1);
        }
#if defined(IP_TOS) && defined(HAVE_SETSOCKOPT)
        tos = IPTOS_LOWDELAY;
        if (setsockopt(0, IPPROTO_IP, IP_TOS, (void *)&tos, sizeof(int)) < 0)
                syslog(LOG_WARNING, "setsockopt (IP_TOS): %m");
#endif
        data_source.sin_port = htons(ntohs(ctrl_addr.sin_port) - 1);

        /* set this here so it can be put in wtmp */
        snprintf(ttyline, sizeof(ttyline), "ftp%u", (unsigned)getpid());


        /*      freopen(_PATH_DEVNULL, "w", stderr); */
        signal(SIGPIPE, lostconn);
        signal(SIGCHLD, SIG_IGN);
#ifdef SIGURG
        if (signal(SIGURG, myoob) == SIG_ERR)
            syslog(LOG_ERR, "signal: %m");
#endif

        auth_init();

        /* Try to handle urgent data inline */
#if defined(SO_OOBINLINE) && defined(HAVE_SETSOCKOPT)
        if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (void *)&on,
                       sizeof(on)) < 0)
                syslog(LOG_ERR, "setsockopt: %m");
#endif

#ifdef  F_SETOWN
        if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1)
                syslog(LOG_ERR, "fcntl F_SETOWN: %m");
#endif
        dolog(&his_addr);
        /*
         * Set up default state
         */
        data = -1;
        type = TYPE_A;
        form = FORM_N;
        stru = STRU_F;
        mode = MODE_S;
        tmpline[0] = '\0';

        /* If logins are disabled, print out the message. */
        if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) {
                while (fgets(line, sizeof(line), fd) != NULL) {
                        if ((cp = strchr(line, '\n')) != NULL)
                                *cp = '\0';
                        lreply(530, "%s", line);
                }
                fflush(stdout);
                fclose(fd);
                reply(530, "System not available.");
                exit(0);
        }
        if ((fd = fopen(_PATH_FTPWELCOME, "r")) != NULL) {
                while (fgets(line, sizeof(line), fd) != NULL) {
                        if ((cp = strchr(line, '\n')) != NULL)
                                *cp = '\0';
                        lreply(220, "%s", line);
                }
                fflush(stdout);
                fclose(fd);
                /* reply(220,) must follow */
        }
        gethostname(hostname, sizeof(hostname));
        reply(220, "%s FTP server (%s+%s) ready.", hostname, 
              version, krb4_version);
        setjmp(errcatch);
        for (;;)
            yyparse();
        /* NOTREACHED */
}

static RETSIGTYPE
lostconn(int signo)
{

        if (debug)
                syslog(LOG_DEBUG, "lost connection");
        dologout(-1);
}

/*
 * Helper function for sgetpwnam().
 */
static char *
sgetsave(char *s)
{
        char *new = strdup(s);

        if (new == NULL) {
                perror_reply(421, "Local resource failure: malloc");
                dologout(1);
                /* NOTREACHED */
        }
        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(char *name)
{
        static struct passwd save;
        struct passwd *p;

        if ((p = k_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 */
#ifdef OTP
OtpContext otp_ctx;
#endif

/*
 * 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(char *name)
{
        char *cp, *shell;

        if(auth_level == 0 && !auth_complete){
            reply(530, "No login allowed without authorization.");
            return;
        }

        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 ((auth_level & AUTH_FTP) == 0 ||
                checkaccess("ftp") || 
                checkaccess("anonymous"))
                reply(530, "User %s access denied.", name);
            else if ((pw = sgetpwnam("ftp")) != NULL) {
                guest = 1;
                defumask = guest_umask; /* paranoia for incoming */
                askpasswd = 1;
                reply(331, "Guest login ok, type your name as password.");
            } else
                reply(530, "User %s unknown.", name);
            if (!askpasswd && logging)
                syslog(LOG_NOTICE,
                       "ANONYMOUS FTP LOGIN REFUSED FROM %s(%s)",
                       remotehost, inet_ntoa(his_addr.sin_addr));
            return;
        }
        if((auth_level & AUTH_PLAIN) == 0 && !auth_complete){
            reply(530, "Only authorized and anonymous login 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 || checkaccess(name)) {
                        reply(530, "User %s access denied.", name);
                        if (logging)
                                syslog(LOG_NOTICE,
                                       "FTP LOGIN REFUSED FROM %s(%s), %s",
                                       remotehost,
                                       inet_ntoa(his_addr.sin_addr),
                                       name);
                        pw = (struct passwd *) NULL;
                        return;
                }
        }
        if (logging)
                strncpy(curname, name, sizeof(curname)-1);
        if(auth_ok())
                ct->userok(name);
        else {
                char ss[256];

#ifdef OTP
                if (otp_challenge(&otp_ctx, name, ss, sizeof(ss)) == 0) {
                        reply(331, "Password %s for %s required.",
                              ss, name);
                        askpasswd = 1;
                } else
#endif
                if ((auth_level & AUTH_OTP) == 0) {
                    reply(331, "Password required for %s.", name);
                    askpasswd = 1;
                } else {
                    char *s;
                    
#ifdef OTP
                    if (s = otp_error (&otp_ctx))
                        lreply(530, "OTP: %s", s);
#endif
                    reply(530,
                          "Only authorized, anonymous"
#ifdef OTP
                          " and OTP "
#endif
                          "login allowed.");
                }

        }
        /*
         * Delay before reading passwd after first failed
         * attempt to slow down passwd-guessing programs.
         */
        if (login_attempts)
                sleep(login_attempts);
}

/*
 * Check if a user is in the file "fname"
 */
static int
checkuser(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;
                                }
                        }
                fclose(fd);
        }
        return (found);
}


/*
 * Determine whether a user has access, based on information in 
 * _PATH_FTPUSERS. The users are listed one per line, with `allow'
 * or `deny' after the username. If anything other than `allow', or
 * just nothing, is given after the username, `deny' is assumed.
 *
 * If the user is not found in the file, but the pseudo-user `*' is,
 * the permission is taken from that line.
 *
 * This preserves the old semantics where if a user was listed in the
 * file he was denied, otherwise he was allowed.
 *
 * Return 1 if the user is denied, or 0 if he is allowed.  */

static int
match(const char *pattern, const char *string)
{
#ifdef HAVE_FNMATCH
    return fnmatch(pattern, string, FNM_NOESCAPE);
#else
    return strcmp(pattern, "*") != 0 && strcmp(pattern, string) != 0;
#endif
}

static int
checkaccess(char *name)
{
#define ALLOWED         0
#define NOT_ALLOWED     1
    FILE *fd;
    int allowed = ALLOWED;
    char *user, *perm, line[BUFSIZ];
    char *foo;
    
    fd = fopen(_PATH_FTPUSERS, "r");
    
    if(fd == NULL)
        return allowed;

    while (fgets(line, sizeof(line), fd) != NULL)  {
        foo = NULL;
        user = strtok_r(line, " \t\n", &foo);
        if (user == NULL || user[0] == '#')
            continue;
        perm = strtok_r(NULL, " \t\n", &foo);
        if (match(user, name) == 0){
            if(perm && strcmp(perm, "allow") == 0)
                allowed = ALLOWED;
            else
                allowed = NOT_ALLOWED;
            break;
        }
    }
    fclose(fd);
    return allowed;
}
#undef  ALLOWED
#undef  NOT_ALLOWED

int do_login(int code, char *passwd)
{
        FILE *fd;
        login_attempts = 0;             /* this time successful */
        if (setegid((gid_t)pw->pw_gid) < 0) {
                reply(550, "Can't set gid.");
                return -1;
        }
        initgroups(pw->pw_name, pw->pw_gid);

        /* open wtmp before chroot */
        logwtmp(ttyline, pw->pw_name, remotehost);
        logged_in = 1;

        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.");
                        return -1;
                }
        } else if (dochroot) {
                if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) {
                        reply(550, "Can't change root.");
                        return -1;
                }
        } 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);
                        return -1;
                } else
                        lreply(code, "No directory! Logging in with home=/");
        }
        if (seteuid((uid_t)pw->pw_uid) < 0) {
                reply(550, "Can't set uid.");
                return -1;
        }
        /*
         * Display a login message, if it exists.
         * N.B. reply(code,) 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(code, "%s", line);
                }
        }
        if (guest) {
                reply(code, "Guest login ok, access restrictions apply.");
#ifdef HAVE_SETPROCTITLE
                snprintf (proctitle, sizeof(proctitle),
                          "%s: anonymous/%s",
                          remotehost,
                          passwd);
#endif /* HAVE_SETPROCTITLE */
                if (logging)
                        syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s(%s), %s",
                               remotehost, 
                               inet_ntoa(his_addr.sin_addr),
                               passwd);
        } else {
                reply(code, "User %s logged in.", pw->pw_name);
#ifdef HAVE_SETPROCTITLE
                snprintf(proctitle, sizeof(proctitle), "%s: %s", remotehost, pw->pw_name);
                setproctitle(proctitle);
#endif /* HAVE_SETPROCTITLE */
                if (logging)
                        syslog(LOG_INFO, "FTP LOGIN FROM %s(%s) as %s",
                               remotehost,
                               inet_ntoa(his_addr.sin_addr),
                               pw->pw_name);
        }
        umask(defumask);
        return 0;
}

/*
 * 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(char *passwd)
{
        int rval;

        /* some clients insists on sending a password */
        if (logged_in && askpasswd == 0){
             reply(230, "Dumpucko!");
             return;
        }

        if (logged_in || askpasswd == 0) {
                reply(503, "Login with USER first.");
                return;
        }
        askpasswd = 0;
        rval = 1;
        if (!guest) {           /* "ftp" is only account allowed no password */
                if (pw == NULL)
                        rval = 1;       /* failure below */
#ifdef OTP
                else if (otp_verify_user (&otp_ctx, passwd) == 0) {
                    rval = 0;
                }
#endif
                else if((auth_level & AUTH_OTP) == 0) {
                    char realm[REALM_SZ];
                    if((rval = krb_get_lrealm(realm, 1)) == KSUCCESS)
                        rval = krb_verify_user(pw->pw_name, "", realm, 
                                               passwd, 1, NULL);
                    if (rval == KSUCCESS ) {
                        chown (tkt_string(), pw->pw_uid, pw->pw_gid);
                        if(k_hasafs())
                            k_afsklog(0, 0);
                    } else 
                        rval = unix_verify_user(pw->pw_name, passwd);
                } else {
                    char *s;
                    
#ifdef OTP
                    if (s = otp_error(&otp_ctx))
                        lreply(530, "OTP: %s", s);
#endif
                }
                memset (passwd, 0, strlen(passwd));

                /*
                 * 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), %s",
                                       remotehost,
                                       inet_ntoa(his_addr.sin_addr),
                                       curname);
                        pw = NULL;
                        if (login_attempts++ >= 5) {
                                syslog(LOG_NOTICE,
                                       "repeated login failures from %s(%s)",
                                       remotehost,
                                       inet_ntoa(his_addr.sin_addr));
                                exit(0);
                        }
                        return;
                }
        }
        if(!do_login(230, passwd))
          return;
        
        /* Forget all about it... */
        end_login();
}

void
retrieve(char *cmd, char *name)
{
        FILE *fin = NULL, *dout;
        struct stat st;
        int (*closefunc) (FILE *);
        char line[BUFSIZ];


        if (cmd == 0) {
                fin = fopen(name, "r");
                closefunc = fclose;
                st.st_size = 0;
                if(fin == NULL){
                    struct cmds {
                        char *ext;
                        char *cmd;
                    } cmds[] = {
                        {".tar", "/bin/gtar cPf - %s"},
                        {".tar.gz", "/bin/gtar zcPf - %s"},
                        {".tar.Z", "/bin/gtar ZcPf - %s"},
                        {".gz", "/bin/gzip -c %s"},
                        {".Z", "/bin/compress -c %s"},
                        {NULL, NULL}
                    };
                    struct cmds *p;
                    for(p = cmds; p->ext; p++){
                        char *tail = name + strlen(name) - strlen(p->ext);
                        char c = *tail;
                        
                        if(strcmp(tail, p->ext) == 0 &&
                           (*tail  = 0) == 0 &&
                           access(name, R_OK) == 0){
                            snprintf (line, sizeof(line), p->cmd, name);
                            *tail  = c;
                            break;
                        }
                        *tail = c;
                    }
                    if(p->ext){
                        fin = ftpd_popen(line, "r", 0, 0);
                        closefunc = ftpd_pclose;
                        st.st_size = -1;
                        cmd = line;
                    }
                }
        } else {
                snprintf(line, sizeof(line), cmd, name);
                name = line;
                fin = ftpd_popen(line, "r", 1, 0);
                closefunc = ftpd_pclose;
                st.st_size = -1;
        }
        if (fin == NULL) {
                if (errno != 0) {
                        perror_reply(550, name);
                        if (cmd == 0) {
                                LOGCMD("get", name);
                        }
                }
                return;
        }
        byte_count = -1;
        if (cmd == 0){
            if(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, SEEK_SET) < 0) {
                        perror_reply(550, name);
                        goto done;
                }
        }
        dout = dataconn(name, st.st_size, "w");
        if (dout == NULL)
                goto done;
        set_buffer_size(fileno(dout), 0);
        send_data(fin, dout);
        fclose(dout);
        data = -1;
        pdata = -1;
done:
        if (cmd == 0)
                LOGBYTES("get", name, byte_count);
        (*closefunc)(fin);
}

/* filename sanity check */

int 
filename_check(char *filename)
{
  static const char good_chars[] = "+-=_,.";
    char *p;

    p = strrchr(filename, '/');
    if(p)
        filename = p + 1;

    p = filename;

    if(isalnum(*p)){
        p++;
        while(*p && (isalnum(*p) || strchr(good_chars, *p)))
            p++;
        if(*p == '\0')
            return 0;
    }
    lreply(553, "\"%s\" is an illegal filename.", filename);
    lreply(553, "The filename must start with an alphanumeric "
           "character and must only");
    reply(553, "consist of alphanumeric characters or any of the following: %s", 
          good_chars);
    return 1;
}

void
do_store(char *name, char *mode, int unique)
{
        FILE *fout, *din;
        struct stat st;
        int (*closefunc) (FILE *);

        if(guest && filename_check(name))
            return;
        if (unique && 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, SEEK_CUR) < 0) {
                                perror_reply(550, name);
                                goto done;
                        }
                } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) {
                        perror_reply(550, name);
                        goto done;
                }
        }
        din = dataconn(name, (off_t)-1, "r");
        if (din == NULL)
                goto done;
        set_buffer_size(fileno(din), 1);
        if (receive_data(din, fout) == 0) {
                if (unique)
                        reply(226, "Transfer complete (unique file name:%s).",
                            name);
                else
                        reply(226, "Transfer complete.");
        }
        fclose(din);
        data = -1;
        pdata = -1;
done:
        LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count);
        (*closefunc)(fout);
}

static FILE *
getdatasock(char *mode)
{
        int on = 1, s, t, tries;

        if (data >= 0)
                return (fdopen(data, mode));
        seteuid((uid_t)0);
        s = socket(AF_INET, SOCK_STREAM, 0);
        if (s < 0)
                goto bad;
#if defined(SO_REUSEADDR) && defined(HAVE_SETSOCKOPT)
        if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
            (void *) &on, sizeof(on)) < 0)
                goto bad;
#endif
        /* anchor socket to avoid multi-homing problems */
        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);
        }
        seteuid((uid_t)pw->pw_uid);
#if defined(IP_TOS) && defined(HAVE_SETSOCKOPT)
        on = IPTOS_THROUGHPUT;
        if (setsockopt(s, IPPROTO_IP, IP_TOS, (void *)&on, sizeof(int)) < 0)
                syslog(LOG_WARNING, "setsockopt (IP_TOS): %m");
#endif
        return (fdopen(s, mode));
bad:
        /* Return the real value of errno (close may change it) */
        t = errno;
        seteuid((uid_t)pw->pw_uid);
        close(s);
        errno = t;
        return (NULL);
}

static FILE *
dataconn(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)
                snprintf(sizebuf, sizeof(sizebuf), " (%ld bytes)", size);
        else
                strcpy(sizebuf, "");
        if (pdata >= 0) {
                struct sockaddr_in from;
                int s, fromlen = sizeof(from);

                s = accept(pdata, (struct sockaddr *)&from, &fromlen);
                if (s < 0) {
                        reply(425, "Can't open data connection.");
                        close(pdata);
                        pdata = -1;
                        return (NULL);
                }
                close(pdata);
                pdata = s;
#if defined(IP_TOS) && defined(HAVE_SETSOCKOPT)
                tos = IPTOS_THROUGHPUT;
                setsockopt(s, IPPROTO_IP, IP_TOS, (void *)&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");
                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(FILE *instr, FILE *outstr)
{
        int c, cnt, filefd, netfd;
        static char *buf;
        static size_t bufsize;
        int i = 0;
        char s[1024];

        transflag++;
        if (setjmp(urgcatch)) {
                transflag = 0;
                return;
        }
        switch (type) {

        case TYPE_A:
                while ((c = getc(instr)) != EOF) {
                    byte_count++;
                    if(i > 1022){
                        auth_write(fileno(outstr), s, i);
                        i = 0;
                    }
                    if(c == '\n')
                        s[i++] = '\r';
                    s[i++] = c;
                }
                if(i)
                    auth_write(fileno(outstr), s, i);
                auth_write(fileno(outstr), s, 0);
                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:
#ifdef HAVE_MMAP
#ifndef MAP_FAILED
#define MAP_FAILED (-1)
#endif
            {
                struct stat st;
                char *chunk;
                int in = fileno(instr);
                if(fstat(in, &st) == 0 && S_ISREG(st.st_mode)) {
                    chunk = mmap(0, st.st_size, PROT_READ, MAP_SHARED, in, 0);
                    if(chunk != (void *)MAP_FAILED) {
                        cnt = st.st_size - restart_point;
                        auth_write(fileno(outstr),
                                   chunk + restart_point,
                                   cnt);
                        munmap(chunk, st.st_size);
                        auth_write(fileno(outstr), NULL, 0);
                        byte_count = cnt;
                        transflag = 0;
                    }
                }
            }
        
#endif
        if(transflag){
            struct stat st;

            netfd = fileno(outstr);
            filefd = fileno(instr);
            buf = alloc_buffer (buf, &bufsize,
                                fstat(filefd, &st) >= 0 ? &st : NULL);
            if (buf == NULL) {
                transflag = 0;
                perror_reply(451, "Local resource failure: malloc");
                return;
            }
            while ((cnt = read(filefd, buf, bufsize)) > 0 &&
                   auth_write(netfd, buf, cnt) == cnt)
                byte_count += cnt;
            auth_write(netfd, buf, 0); /* to end an encrypted stream */
            transflag = 0;
            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(FILE *instr, FILE *outstr)
{
    int cnt, bare_lfs = 0;
    static char *buf;
    static size_t bufsize;
    struct stat st;

    transflag++;
    if (setjmp(urgcatch)) {
        transflag = 0;
        return (-1);
    }

    buf = alloc_buffer (buf, &bufsize,
                        fstat(fileno(outstr), &st) >= 0 ? &st : NULL);
    if (buf == NULL) {
        transflag = 0;
        perror_reply(451, "Local resource failure: malloc");
        return -1;
    }
    
    switch (type) {

    case TYPE_I:
    case TYPE_L:
        while ((cnt = auth_read(fileno(instr), buf, bufsize)) > 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:
    {
        char *p, *q;
        int cr_flag = 0;
        while ((cnt = auth_read(fileno(instr),
                                buf + cr_flag, 
                                bufsize - cr_flag)) > 0){
            byte_count += cnt;
            cnt += cr_flag;
            cr_flag = 0;
            for(p = buf, q = buf; p < buf + cnt;) {
                if(*p == '\n')
                    bare_lfs++;
                if(*p == '\r')
                    if(p == buf + cnt - 1){
                        cr_flag = 1;
                        p++;
                        continue;
                    }else if(p[1] == '\n'){
                        *q++ = '\n';
                        p += 2;
                        continue;
                    }
                *q++ = *p++;
            }
            fwrite(buf, q - buf, 1, outstr);
            if(cr_flag)
                buf[0] = '\r';
        }
        if(cr_flag)
            putc('\r', outstr);
        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\r\n"
                   "    File may not have transferred correctly.\r\n",
                   bare_lfs);
        }
        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(char *filename)
{
        FILE *fin;
        int c;
        char line[LINE_MAX];

        snprintf(line, sizeof(line), "/bin/ls -la %s", filename);
        fin = ftpd_popen(line, "r", 1, 0);
        lreply(211, "status of %s:", filename);
        while ((c = getc(fin)) != EOF) {
                if (c == '\n') {
                        if (ferror(stdout)){
                                perror_reply(421, "control connection");
                                ftpd_pclose(fin);
                                dologout(1);
                                /* NOTREACHED */
                        }
                        if (ferror(fin)) {
                                perror_reply(551, filename);
                                ftpd_pclose(fin);
                                return;
                        }
                        putc('\r', stdout);
                }
                putc(c, stdout);
        }
        ftpd_pclose(fin);
        reply(211, "End of Status");
}

void
statcmd(void)
{
#if 0
        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");
#endif
        reply(211, "End of status");
}

void
fatal(char *s)
{

        reply(451, "Error in server: %s\n", s);
        reply(221, "Closing connection due to server error.");
        dologout(0);
        /* NOTREACHED */
}

static void
int_reply(int, char *, const char *, va_list)
#ifdef __GNUC__
__attribute__ ((format (printf, 3, 0)))
#endif
;

static void
int_reply(int n, char *c, const char *fmt, va_list ap)
{
  char buf[10240];
  char *p;
  p=buf;
  if(n){
      snprintf(p, sizeof(buf), "%d%s", n, c);
      p+=strlen(p);
  }
  vsnprintf(p, sizeof(buf) - strlen(p), fmt, ap);
  p+=strlen(p);
  snprintf(p, sizeof(buf) - strlen(p), "\r\n");
  p+=strlen(p);
  auth_printf("%s", buf);
  fflush(stdout);
  if (debug)
    syslog(LOG_DEBUG, "<--- %s- ", buf);
}

void
reply(int n, const char *fmt, ...)
{
  va_list ap;
  va_start(ap, fmt);
  int_reply(n, " ", fmt, ap);
  delete_ftp_command();
  va_end(ap);
}

void
lreply(int n, const char *fmt, ...)
{
  va_list ap;
  va_start(ap, fmt);
  int_reply(n, "-", fmt, ap);
  va_end(ap);
}

void
nreply(const char *fmt, ...)
{
  va_list ap;
  va_start(ap, fmt);
  int_reply(0, NULL, fmt, ap);
  va_end(ap);
}

static void
ack(char *s)
{

        reply(250, "%s command successful.", s);
}

void
nack(char *s)
{

        reply(502, "%s command not implemented.", s);
}

/* ARGSUSED */
void
yyerror(char *s)
{
        char *cp;

        if ((cp = strchr(cbuf,'\n')))
                *cp = '\0';
        reply(500, "'%s': command not understood.", cbuf);
}

void
do_delete(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(char *path)
{

        if (chdir(path) < 0)
                perror_reply(550, path);
        else
                ack("CWD");
}

void
makedir(char *name)
{

        LOGCMD("mkdir", name);
        if(guest && filename_check(name))
            return;
        if (mkdir(name, 0777) < 0)
                perror_reply(550, name);
        else{
            if(guest)
                chmod(name, 0700); /* guest has umask 777 */
            reply(257, "MKD command successful.");
        }
}

void
removedir(char *name)
{

        LOGCMD("rmdir", name);
        if (rmdir(name) < 0)
                perror_reply(550, name);
        else
                ack("RMD");
}

void
pwd(void)
{
    char path[MaxPathLen + 1];
    char *ret;

    /* SunOS has a broken getcwd that does popen(pwd) (!!!), this
     * failes miserably when running chroot 
     */
    ret = getcwd(path, sizeof(path));
    if (ret == NULL)
        reply(550, "%s.", strerror(errno));
    else
        reply(257, "\"%s\" is current directory.", path);
}

char *
renamefrom(char *name)
{
        struct stat st;

        if (stat(name, &st) < 0) {
                perror_reply(550, name);
                return NULL;
        }
        reply(350, "File exists, ready for destination name");
        return (name);
}

void
renamecmd(char *from, char *to)
{

        LOGCMD2("rename", from, to);
        if(guest && filename_check(to))
            return;
        if (rename(from, to) < 0)
                perror_reply(550, "rename");
        else
                ack("RNTO");
}

static void
dolog(struct sockaddr_in *sin)
{
        inaddr2str (sin->sin_addr, remotehost, sizeof(remotehost));
#ifdef HAVE_SETPROCTITLE
        snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost);
        setproctitle(proctitle);
#endif /* HAVE_SETPROCTITLE */

        if (logging)
                syslog(LOG_INFO, "connection from %s(%s)",
                       remotehost,
                       inet_ntoa(his_addr.sin_addr));
}

/*
 * Record logout in wtmp file
 * and exit with supplied status.
 */
void
dologout(int status)
{
    transflag = 0;
    if (logged_in) {
        seteuid((uid_t)0);
        logwtmp(ttyline, "", "");
        cond_kdestroy();
    }
    /* beware of flushing buffers after a SIGPIPE */
#ifdef XXX
    exit(status);
#else
    _exit(status);
#endif  
}

void abor(void)
{
}

static void
myoob(int signo)
{
#if 0
        char *cp;
#endif

        /* only process if transfer occurring */
        if (!transflag)
                return;

        /* This is all XXX */
        oobflag = 1;
        /* if the command resulted in a new command, 
           parse that as well */
        do{
            yyparse();
        } while(ftp_command);
        oobflag = 0;

#if 0 
        cp = tmpline;
        if (getline(cp, 7) == 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: %ld of %ld bytes transferred",
                              (long)byte_count,
                              (long)file_size);
                else
                        reply(213, "Status: %ld bytes transferred"
                              (long)byte_count);
        }
#endif
}

/*
 * 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(void)
{
        int len;
        char *p, *a;

        pdata = socket(AF_INET, SOCK_STREAM, 0);
        if (pdata < 0) {
                perror_reply(425, "Can't open passive connection");
                return;
        }
        pasv_addr = ctrl_addr;
        pasv_addr.sin_port = 0;
        seteuid((uid_t)0);
        if (bind(pdata, (struct sockaddr *)&pasv_addr, sizeof(pasv_addr)) < 0) {
                seteuid((uid_t)pw->pw_uid);
                goto pasv_error;
        }
        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:
        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(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 NULL;
        }
        if (cp)
                *cp = '/';
        for (count = 1; count < 100; count++) {
                snprintf (new, sizeof(new), "%s.%d", local, 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(int code, char *string)
{
        reply(code, "%s: %s.", string, strerror(errno));
}

static char *onefile[] = {
        "",
        0
};

void
send_file_list(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;
  char buf[MaxPathLen];

  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) {
        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++;
      }
      snprintf(buf, sizeof(buf), "%s%s\n", dirname,
              type == TYPE_A ? "\r" : "");
      auth_write(fileno(dout), buf, strlen(buf));
      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 (!strcmp(dir->d_name, "."))
        continue;
      if (!strcmp(dir->d_name, ".."))
        continue;

      snprintf(nbuf, sizeof(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(strncmp(nbuf, "./", 2) == 0)
          snprintf(buf, sizeof(buf), "%s%s\n", nbuf +2,
                   type == TYPE_A ? "\r" : "");
        else
          snprintf(buf, sizeof(buf), "%s%s\n", nbuf,
                   type == TYPE_A ? "\r" : "");
        auth_write(fileno(dout), buf, strlen(buf));
        byte_count += strlen(nbuf) + 1;
      }
    }
    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){
    auth_write(fileno(dout), buf, 0); /* XXX flush */
            
    fclose(dout);
  }
  data = -1;
  pdata = -1;
out:
  if (freeglob) {
    freeglob = 0;
    globfree(&gl);
  }
}


int
find(char *pattern)
{
    char line[1024];
    FILE *f;

    snprintf(line, sizeof(line),
             "/bin/locate -d %s %s",
             ftp_rooted("/etc/locatedb"),
             pattern);
    f = ftpd_popen(line, "r", 1, 1);
    if(f == NULL){
        perror_reply(550, "/bin/locate");
        return 1;
    }
    lreply(200, "Output from find.");
    while(fgets(line, sizeof(line), f)){
        if(line[strlen(line)-1] == '\n')
            line[strlen(line)-1] = 0;
        nreply("%s", line);
    }
    reply(200, "Done");
    ftpd_pclose(f);
    return 0;
}