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[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.
 */

#define FTP_NAMES
#include "ftpd_locl.h"
#ifdef KRB5
#include <krb5.h>
#endif
#include "getarg.h"

RCSID("$Id$");

static char version[] = "Version 6.00";

extern  off_t restart_point;
extern  char cbuf[];

struct  sockaddr_storage ctrl_addr_ss;
struct  sockaddr *ctrl_addr = (struct sockaddr *)&ctrl_addr_ss;

struct  sockaddr_storage data_source_ss;
struct  sockaddr *data_source = (struct sockaddr *)&data_source_ss;

struct  sockaddr_storage data_dest_ss;
struct  sockaddr *data_dest = (struct sockaddr *)&data_dest_ss;

struct  sockaddr_storage his_addr_ss;
struct  sockaddr *his_addr = (struct sockaddr *)&his_addr_ss;

struct  sockaddr_storage pasv_addr_ss;
struct  sockaddr *pasv_addr = (struct sockaddr *)&pasv_addr_ss;

int     data;
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     restricted_data_ports = 1;
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     allow_insecure_oob = 1;
static int transflag;
static int urgflag;
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       handleoobcmd(void);
static int       checkuser (char *, char *);
static int       checkaccess (char *);
static FILE     *dataconn (const char *, off_t, const char *);
static void      dolog (struct sockaddr *sa, int len);
static void      end_login (void);
static FILE     *getdatasock (const 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 char *
curdir(void)
{
        static char path[MaxPathLen+1]; /* path + '/' + '\0' */

        if (getcwd(path, sizeof(path)-1) == NULL)
                return ("");
        if (path[1] != '\0')            /* special case for root dir. */
                strlcat(path, "/", sizeof(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 int interactive_flag;
static char *guest_umask_string;
static char *port_string;
static char *umask_string;
static char *auth_string;

int use_builtin_ls = -1;

static int help_flag;
static int version_flag;

static const char *good_chars = "+-=_,.";

struct getargs args[] = {
    { NULL, 'a', arg_string, &auth_string, "required authentication" },
    { NULL, 'i', arg_flag, &interactive_flag, "don't assume stdin is a socket" },
    { NULL, 'p', arg_string, &port_string, "what port to listen to" },
    { NULL, 'g', arg_string, &guest_umask_string, "umask for guest logins" },
    { NULL, 'l', arg_counter, &logging, "log more stuff", "" },
    { NULL, 't', arg_integer, &ftpd_timeout, "initial timeout" },
    { NULL, 'T', arg_integer, &maxtimeout, "max timeout" },
    { NULL, 'u', arg_string, &umask_string, "umask for user logins" },
    { NULL, 'U', arg_negative_flag, &restricted_data_ports, "don't use high data ports" },
    { NULL, 'd', arg_flag, &debug, "enable debugging" },
    { NULL, 'v', arg_flag, &debug, "enable debugging" },
    { "builtin-ls", 'B', arg_flag, &use_builtin_ls, "use built-in ls to list files" },
    { "good-chars", 0, arg_string, &good_chars, "allowed anonymous upload filename chars" },
    { "insecure-oob", 'I', arg_negative_flag, &allow_insecure_oob, "don't allow insecure OOB ABOR/STAT" },
#ifdef KRB5    
    { "gss-bindings", 0,  arg_flag, &ftp_do_gss_bindings, "Require GSS-API bindings", NULL},
#endif
    { "version", 0, arg_flag, &version_flag },
    { "help", 'h', arg_flag, &help_flag }
};

static int num_args = sizeof(args) / sizeof(args[0]);

static void
usage (int code)
{
    arg_printusage(args, num_args, NULL, "");
    exit (code);
}

/* output contents of a file */
static int
show_file(const char *file, int code)
{
    FILE *f;
    char buf[128];

    f = fopen(file, "r");
    if(f == NULL)
        return -1;
    while(fgets(buf, sizeof(buf), f)){
        buf[strcspn(buf, "\r\n")] = '\0';
        lreply(code, "%s", buf);
    }
    fclose(f);
    return 0;
}

int
main(int argc, char **argv)
{
    socklen_t his_addr_len, ctrl_addr_len;
    int on = 1;
    int port;
    struct servent *sp;

    int optind = 0;

    setprogname (argv[0]);

    /* detach from any tickets and tokens */
    {
#ifdef KRB4
        char tkfile[1024];
        snprintf(tkfile, sizeof(tkfile),
                 "/tmp/ftp_%u", (unsigned)getpid());
        krb_set_tkt_string(tkfile);
#endif
    }
#if defined(KRB4) || defined(KRB5)
    if(k_hasafs())
        k_setpag();
#endif

    if(getarg(args, num_args, argc, argv, &optind))
        usage(1);

    if(help_flag)
        usage(0);
        
    if(version_flag) {
        print_version(NULL);
        exit(0);
    }

    if(auth_string)
        auth_level = parse_auth_level(auth_string);
    {
        char *p;
        long val = 0;
            
        if(guest_umask_string) {
            val = strtol(guest_umask_string, &p, 8);
            if (*p != '\0' || val < 0)
                warnx("bad value for -g");
            else
                guest_umask = val;
        }
        if(umask_string) {
            val = strtol(umask_string, &p, 8);
            if (*p != '\0' || val < 0)
                warnx("bad value for -u");
            else
                defumask = val;
        }
    }
    sp = getservbyname("ftp", "tcp");
    if(sp)
        port = sp->s_port;
    else
        port = htons(21);
    if(port_string) {
        sp = getservbyname(port_string, "tcp");
        if(sp)
            port = sp->s_port;
        else
            if(isdigit((unsigned char)port_string[0]))
                port = htons(atoi(port_string));
            else
                warnx("bad value for -p");
    }
                    
    if (maxtimeout < ftpd_timeout)
        maxtimeout = ftpd_timeout;

#if 0
    if (ftpd_timeout > maxtimeout)
        ftpd_timeout = maxtimeout;
#endif

    if(interactive_flag)
        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);
    his_addr_len = sizeof(his_addr_ss);
    if (getpeername(STDIN_FILENO, his_addr, &his_addr_len) < 0) {
        syslog(LOG_ERR, "getpeername (%s): %m",argv[0]);
        exit(1);
    }
    ctrl_addr_len = sizeof(ctrl_addr_ss);
    if (getsockname(STDIN_FILENO, ctrl_addr, &ctrl_addr_len) < 0) {
        syslog(LOG_ERR, "getsockname (%s): %m",argv[0]);
        exit(1);
    }
#if defined(IP_TOS) && defined(HAVE_SETSOCKOPT)
    {
        int tos = IPTOS_LOWDELAY;

        if (setsockopt(STDIN_FILENO, IPPROTO_IP, IP_TOS,
                       (void *)&tos, sizeof(int)) < 0)
            syslog(LOG_WARNING, "setsockopt (IP_TOS): %m");
    }
#endif
    data_source->sa_family = ctrl_addr->sa_family;
    socket_set_port (data_source,
                     htons(ntohs(socket_get_port(ctrl_addr)) - 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

    /* 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, his_addr_len);
    /*
     * 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(show_file(_PATH_NOLOGIN, 530) == 0) {
        reply(530, "System not available.");
        exit(0);
    }
    show_file(_PATH_FTPWELCOME, 220);
    /* reply(220,) must follow */
    gethostname(hostname, sizeof(hostname));
        
    reply(220, "%s FTP server (%s"
#ifdef KRB5
          "+%s"
#endif
#ifdef KRB4
          "+%s"
#endif
          ") ready.", hostname, version
#ifdef KRB5
          ,heimdal_version
#endif
#ifdef KRB4
          ,krb4_version
#endif
          );

    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 && !sec_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) {
                char data_addr[256];

                if (inet_ntop (his_addr->sa_family,
                               socket_get_address(his_addr),
                               data_addr, sizeof(data_addr)) == NULL)
                        strlcpy (data_addr, "unknown address",
                                         sizeof(data_addr));

                syslog(LOG_NOTICE,
                       "ANONYMOUS FTP LOGIN REFUSED FROM %s(%s)",
                       remotehost, data_addr);
            }
            return;
        }
        if((auth_level & AUTH_PLAIN) == 0 && !sec_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) {
                                char data_addr[256];

                                if (inet_ntop (his_addr->sa_family,
                                               socket_get_address(his_addr),
                                               data_addr,
                                               sizeof(data_addr)) == NULL)
                                        strlcpy (data_addr,
                                                         "unknown address",
                                                         sizeof(data_addr));

                                syslog(LOG_NOTICE,
                                       "FTP LOGIN REFUSED FROM %s(%s), %s",
                                       remotehost,
                                       data_addr,
                                       name);
                        }
                        pw = (struct passwd *) NULL;
                        return;
                }
        }
        if (logging)
            strlcpy(curname, name, sizeof(curname));
        if(sec_complete) {
            if(sec_userok(name) == 0)
                do_login(232, name);
            else
                reply(530, "User %s access denied.", 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)) != NULL)
                        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)
{
    return fnmatch(pattern, string, FNM_NOESCAPE);
}

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)
{
    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 */
    ftpd_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;
    }

    if(use_builtin_ls == -1) {
        struct stat st;
        /* if /bin/ls exist and is a regular file, use it, otherwise
           use built-in ls */
        if(stat("/bin/ls", &st) == 0 &&
           S_ISREG(st.st_mode))
            use_builtin_ls = 0;
        else
            use_builtin_ls = 1;
    }

    /*
     * Display a login message, if it exists.
     * N.B. reply(code,) must follow the message.
     */
    show_file(_PATH_FTPLOGINMESG, code);
    if(show_file(_PATH_ISSUE_NET, code) != 0)
        show_file(_PATH_ISSUE, code);
    if (guest) {
        reply(code, "Guest login ok, access restrictions apply.");
#ifdef HAVE_SETPROCTITLE
        snprintf (proctitle, sizeof(proctitle),
                  "%s: anonymous/%s",
                  remotehost,
                  passwd);
        setproctitle("%s", proctitle);
#endif /* HAVE_SETPROCTITLE */
        if (logging) {
            char data_addr[256];

            if (inet_ntop (his_addr->sa_family,
                           socket_get_address(his_addr),
                           data_addr, sizeof(data_addr)) == NULL)
                strlcpy (data_addr, "unknown address",
                                 sizeof(data_addr));

            syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s(%s), %s",
                   remotehost, 
                   data_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("%s", proctitle);
#endif /* HAVE_SETPROCTITLE */
        if (logging) {
            char data_addr[256];

            if (inet_ntop (his_addr->sa_family,
                           socket_get_address(his_addr),
                           data_addr, sizeof(data_addr)) == NULL)
                strlcpy (data_addr, "unknown address",
                                 sizeof(data_addr));

            syslog(LOG_INFO, "FTP LOGIN FROM %s(%s) as %s",
                   remotehost,
                   data_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)
                ftpd_logwtmp(ttyline, "", "");
        pw = NULL;
        logged_in = 0;
        guest = 0;
        dochroot = 0;
}

#ifdef KRB5
static int
krb5_verify(struct passwd *pwd, char *passwd)
{
   krb5_context context;  
   krb5_ccache  id;
   krb5_principal princ;
   krb5_error_code ret;
  
   ret = krb5_init_context(&context);
   if(ret)
        return ret;

  ret = krb5_parse_name(context, pwd->pw_name, &princ);
  if(ret){
        krb5_free_context(context);
        return ret;
  }
  ret = krb5_cc_gen_new(context, &krb5_mcc_ops, &id);
  if(ret){
        krb5_free_principal(context, princ);
        krb5_free_context(context);
        return ret;
  }
  ret = krb5_verify_user(context,
                         princ,
                         id,
                         passwd,
                         1,
                         NULL);
  krb5_free_principal(context, princ);
  if (k_hasafs()) {
      krb5_afslog_uid_home(context, id,NULL, NULL,pwd->pw_uid, pwd->pw_dir);
  }
  krb5_cc_destroy(context, id);
  krb5_free_context (context);
  if(ret) 
      return ret;
  return 0;
}
#endif /* KRB5 */

void
pass(char *passwd)
{
        int rval;

        /* some clients insists on sending a password */
        if (logged_in && askpasswd == 0){
            reply(230, "Password not necessary");
            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) {
#ifdef KRB5
                    rval = krb5_verify(pw, passwd);
#endif
#ifdef KRB4
                    if (rval) {
                        char realm[REALM_SZ];
                        if((rval = krb_get_lrealm(realm, 1)) == KSUCCESS)
                            rval = krb_verify_user(pw->pw_name,
                                                   "", realm, 
                                                   passwd, 
                                                   KRB_VERIFY_SECURE, NULL);
                        if (rval == KSUCCESS ) {
                            chown (tkt_string(), pw->pw_uid, pw->pw_gid);
                            if(k_hasafs())
                                krb_afslog(0, 0);
                        }
                    }
#endif
                    if (rval)
                        rval = unix_verify_user(pw->pw_name, passwd);
                } else {
                    char *s;
                    
#ifdef OTP
                    if ((s = otp_error(&otp_ctx)) != NULL)
                        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) {
                        char data_addr[256];

                        if (inet_ntop (his_addr->sa_family,
                                       socket_get_address(his_addr),
                                       data_addr, sizeof(data_addr)) == NULL)
                                strlcpy (data_addr, "unknown address",
                                                 sizeof(data_addr));

                        reply(530, "Login incorrect.");
                        if (logging)
                                syslog(LOG_NOTICE,
                                    "FTP LOGIN FAILED FROM %s(%s), %s",
                                       remotehost,
                                       data_addr,
                                       curname);
                        pw = NULL;
                        if (login_attempts++ >= 5) {
                                syslog(LOG_NOTICE,
                                       "repeated login failures from %s(%s)",
                                       remotehost,
                                       data_addr);
                                exit(0);
                        }
                        return;
                }
        }
        if(!do_login(230, passwd))
          return;
        
        /* Forget all about it... */
        end_login();
}

void
retrieve(const 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){
                    int save_errno = errno;
                    struct cmds {
                        const char *ext;
                        const char *cmd;
                        const char *rev_cmd;
                    } cmds[] = {
                        {".tar", "/bin/gtar cPf - %s", NULL},
                        {".tar.gz", "/bin/gtar zcPf - %s", NULL},
                        {".tar.Z", "/bin/gtar ZcPf - %s", NULL},
                        {".gz", "/bin/gzip -c -- %s", "/bin/gzip -c -d -- %s"},
                        {".Z", "/bin/compress -c -- %s", "/bin/uncompress -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->rev_cmd != NULL) {
                            char *ext;

                            asprintf(&ext, "%s%s", name, p->ext);
                            if (ext != NULL) { 
                                if (access(ext, R_OK) == 0) {
                                    snprintf (line, sizeof(line),
                                              p->rev_cmd, ext);
                                    free(ext);
                                    break;
                                }
                                free(ext);
                            }
                        }
                        
                    }
                    if(p->ext){
                        fin = ftpd_popen(line, "r", 0, 0);
                        closefunc = ftpd_pclose;
                        st.st_size = -1;
                        cmd = line;
                    } else
                        errno = save_errno;
                }
        } 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)
{
    unsigned char *p;

    p = (unsigned char *)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 not an acceptable 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((*closefunc)(fout) < 0)
                perror_reply(552, name);
            else {
                if (unique)
                        reply(226, "Transfer complete (unique file name:%s).",
                            name);
                else
                        reply(226, "Transfer complete.");
            }
        } else
            (*closefunc)(fout);
        fclose(din);
        data = -1;
        pdata = -1;
done:
        LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count);
}

static FILE *
getdatasock(const char *mode)
{
        int s, t, tries;

        if (data >= 0)
                return (fdopen(data, mode));
        seteuid(0);
        s = socket(ctrl_addr->sa_family, SOCK_STREAM, 0);
        if (s < 0)
                goto bad;
        socket_set_reuseaddr (s, 1);
        /* anchor socket to avoid multi-homing problems */
        socket_set_address_and_port (data_source,
                                     socket_get_address (ctrl_addr),
                                     socket_get_port (data_source));

        for (tries = 1; ; tries++) {
                if (bind(s, data_source,
                         socket_sockaddr_size (data_source)) >= 0)
                        break;
                if (errno != EADDRINUSE || tries > 10)
                        goto bad;
                sleep(tries);
        }
        seteuid(pw->pw_uid);
#ifdef IPTOS_THROUGHPUT
        socket_set_tos (s, IPTOS_THROUGHPUT);
#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 int
accept_with_timeout(int socket, 
                    struct sockaddr *address,
                    socklen_t *address_len,
                    struct timeval *timeout)
{
    int ret;
    fd_set rfd;
    FD_ZERO(&rfd);
    FD_SET(socket, &rfd);
    ret = select(socket + 1, &rfd, NULL, NULL, timeout);
    if(ret < 0)
        return ret;
    if(ret == 0) {
        errno = ETIMEDOUT;
        return -1;
    }
    return accept(socket, address, address_len);
}

static FILE *
dataconn(const char *name, off_t size, const char *mode)
{
        char sizebuf[32];
        FILE *file;
        int retry = 0;

        file_size = size;
        byte_count = 0;
        if (size >= 0)
            snprintf(sizebuf, sizeof(sizebuf), " (%ld bytes)", (long)size);
        else
            *sizebuf = '\0';
        if (pdata >= 0) {
                struct sockaddr_storage from_ss;
                struct sockaddr *from = (struct sockaddr *)&from_ss;
                struct timeval timeout;
                int s;
                socklen_t fromlen = sizeof(from_ss);

                timeout.tv_sec = 15;
                timeout.tv_usec = 0;
                s = accept_with_timeout(pdata, from, &fromlen, &timeout);
                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)
                {
                    int tos = IPTOS_THROUGHPUT;
                    
                    setsockopt(s, IPPROTO_IP, IP_TOS, (void *)&tos,
                               sizeof(tos));
                }
#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) {
                char data_addr[256];

                if (inet_ntop (data_source->sa_family,
                               socket_get_address(data_source),
                               data_addr, sizeof(data_addr)) == NULL)
                        strlcpy (data_addr, "unknown address",
                                         sizeof(data_addr));

                reply(425, "Can't create data socket (%s,%d): %s.",
                      data_addr,
                      socket_get_port (data_source),
                      strerror(errno));
                return (NULL);
        }
        data = fileno(file);
        while (connect(data, data_dest,
                       socket_sockaddr_size(data_dest)) < 0) {
                if (errno == EADDRINUSE && retry < swaitmax) {
                        sleep(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;

        transflag = 1;
        switch (type) {

        case TYPE_A:
            while ((c = getc(instr)) != EOF) {
                if (urgflag && handleoobcmd())
                    return;
                byte_count++;
                if(c == '\n')
                    sec_putc('\r', outstr);
                sec_putc(c, outstr);
            }
            sec_fflush(outstr);
            transflag = 0;
            urgflag = 0;
            if (ferror(instr))
                goto file_err;
            if (ferror(outstr))
                goto data_err;
            reply(226, "Transfer complete.");
            return;
                
        case TYPE_I:
        case TYPE_L:
#if 0 /* XXX handle urg flag */
#if defined(HAVE_MMAP) && !defined(NO_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) 
                   && st.st_size > 0) {
                    /*
                     * mmap zero bytes has potential of loosing, don't do it.
                     */
                    chunk = mmap(0, st.st_size, PROT_READ,
                                 MAP_SHARED, in, 0);
                    if((void *)chunk != (void *)MAP_FAILED) {
                        cnt = st.st_size - restart_point;
                        sec_write(fileno(outstr), chunk + restart_point, cnt);
                        if (munmap(chunk, st.st_size) < 0)
                            warn ("munmap");
                        sec_fflush(outstr);
                        byte_count = cnt;
                        transflag = 0;
                        urgflag = 0;
                    }
                }
            }
#endif
#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;
                urgflag = 0;
                perror_reply(451, "Local resource failure: malloc");
                return;
            }
            while ((cnt = read(filefd, buf, bufsize)) > 0 &&
                   sec_write(netfd, buf, cnt) == cnt) {
                byte_count += cnt;
                if (urgflag && handleoobcmd())
                    return;
            }
            sec_fflush(outstr); /* to end an encrypted stream */
            transflag = 0;
            urgflag = 0;
            if (cnt != 0) {
                if (cnt < 0)
                    goto file_err;
                goto data_err;
            }
        }
        reply(226, "Transfer complete.");
        return;
        default:
            transflag = 0;
            urgflag = 0;
            reply(550, "Unimplemented TYPE %d in send_data", type);
            return;
        }

data_err:
        transflag = 0;
        urgflag = 0;
        perror_reply(426, "Data connection");
        return;

file_err:
        transflag = 0;
        urgflag = 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 = 1;

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

    case TYPE_I:
    case TYPE_L:
        while ((cnt = sec_read(fileno(instr), buf, bufsize)) > 0) {
            if (write(fileno(outstr), buf, cnt) != cnt)
                goto file_err;
            byte_count += cnt;
            if (urgflag && handleoobcmd())
                return (-1);
        }
        if (cnt < 0)
            goto data_err;
        transflag = 0;
        urgflag = 0;
        return (0);

    case TYPE_E:
        reply(553, "TYPE E not implemented.");
        transflag = 0;
        urgflag = 0;
        return (-1);

    case TYPE_A:
    {
        char *p, *q;
        int cr_flag = 0;
        while ((cnt = sec_read(fileno(instr),
                                buf + cr_flag, 
                                bufsize - cr_flag)) > 0){
            if (urgflag && handleoobcmd())
                return (-1);
            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;
        urgflag = 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;
        urgflag = 0;
        return (-1);
    }
        
data_err:
    transflag = 0;
    urgflag = 0;
    perror_reply(426, "Data Connection");
    return (-1);
        
file_err:
    transflag = 0;
    urgflag = 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 (%s) 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);
    sec_fprintf(stdout, "%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);
}

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];
    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 *sa, int len)
{
        getnameinfo_verified (sa, len, remotehost, sizeof(remotehost),
                              NULL, 0, 0);
#ifdef HAVE_SETPROCTITLE
        snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost);
        setproctitle("%s", proctitle);
#endif /* HAVE_SETPROCTITLE */

        if (logging) {
                char data_addr[256];

                if (inet_ntop (his_addr->sa_family,
                               socket_get_address(his_addr),
                               data_addr, sizeof(data_addr)) == NULL)
                        strlcpy (data_addr, "unknown address",
                                         sizeof(data_addr));


                syslog(LOG_INFO, "connection from %s(%s)",
                       remotehost,
                       data_addr);
        }
}

/*
 * Record logout in wtmp file
 * and exit with supplied status.
 */
void
dologout(int status)
{
    transflag = 0;
    urgflag = 0;
    if (logged_in) {
        seteuid((uid_t)0);
        ftpd_logwtmp(ttyline, "", "");
#ifdef KRB4
        cond_kdestroy();
#endif
    }
    /* beware of flushing buffers after a SIGPIPE */
#ifdef XXX
    exit(status);
#else
    _exit(status);
#endif  
}

void abor(void)
{
    if (!transflag)
        return;
    reply(426, "Transfer aborted. Data connection closed.");
    reply(226, "Abort successful");
    transflag = 0;
}

static void
myoob(int signo)
{
    urgflag = 1;
}

static char *
mec_space(char *p)
{
    while(isspace(*(unsigned char *)p))
          p++;
    return p;
}

static int
handleoobcmd(void)
{
        char *cp;

        /* only process if transfer occurring */
        if (!transflag)
                return 0;

        urgflag = 0;

        cp = tmpline;
        if (ftpd_getline(cp, sizeof(tmpline)) == NULL) {
                reply(221, "You could at least say goodbye.");
                dologout(0);
        }

        if (strncasecmp("MIC", cp, 3) == 0) {
            mec(mec_space(cp + 3), prot_safe);
        } else if (strncasecmp("CONF", cp, 4) == 0) {
            mec(mec_space(cp + 4), prot_confidential);
        } else if (strncasecmp("ENC", cp, 3) == 0) {
            mec(mec_space(cp + 3), prot_private);
        } else if (!allow_insecure_oob) {
            reply(533, "Command protection level denied "
                  "for paranoid reasons.");
            goto out;
        }

        if (secure_command())
            cp = ftp_command;

        if (strcasecmp(cp, "ABOR\r\n") == 0) {
                abor();
        } else if (strcasecmp(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);
        }
out:
        return (transflag == 0);
}

/*
 * 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
pasv(void)
{
        socklen_t len;
        char *p, *a;
        struct sockaddr_in *sin;

        if (ctrl_addr->sa_family != AF_INET) {
                reply(425,
                      "You cannot do PASV with something that's not IPv4");
                return;
        }

        if(pdata != -1)
            close(pdata);

        pdata = socket(ctrl_addr->sa_family, SOCK_STREAM, 0);
        if (pdata < 0) {
                perror_reply(425, "Can't open passive connection");
                return;
        }
        pasv_addr->sa_family = ctrl_addr->sa_family;
        socket_set_address_and_port (pasv_addr,
                                     socket_get_address (ctrl_addr),
                                     0);
        socket_set_portrange(pdata, restricted_data_ports, 
            pasv_addr->sa_family); 
        seteuid(0);
        if (bind(pdata, pasv_addr, socket_sockaddr_size (pasv_addr)) < 0) {
                seteuid(pw->pw_uid);
                goto pasv_error;
        }
        seteuid(pw->pw_uid);
        len = sizeof(pasv_addr_ss);
        if (getsockname(pdata, pasv_addr, &len) < 0)
                goto pasv_error;
        if (listen(pdata, 1) < 0)
                goto pasv_error;
        sin = (struct sockaddr_in *)pasv_addr;
        a = (char *) &sin->sin_addr;
        p = (char *) &sin->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;
}

void
epsv(char *proto)
{
        socklen_t len;

        pdata = socket(ctrl_addr->sa_family, SOCK_STREAM, 0);
        if (pdata < 0) {
                perror_reply(425, "Can't open passive connection");
                return;
        }
        pasv_addr->sa_family = ctrl_addr->sa_family;
        socket_set_address_and_port (pasv_addr,
                                     socket_get_address (ctrl_addr),
                                     0);
        socket_set_portrange(pdata, restricted_data_ports, 
            pasv_addr->sa_family); 
        seteuid(0);
        if (bind(pdata, pasv_addr, socket_sockaddr_size (pasv_addr)) < 0) {
                seteuid(pw->pw_uid);
                goto pasv_error;
        }
        seteuid(pw->pw_uid);
        len = sizeof(pasv_addr_ss);
        if (getsockname(pdata, pasv_addr, &len) < 0)
                goto pasv_error;
        if (listen(pdata, 1) < 0)
                goto pasv_error;

        reply(229, "Entering Extended Passive Mode (|||%d|)",
              ntohs(socket_get_port (pasv_addr)));
        return;

pasv_error:
        close(pdata);
        pdata = -1;
        perror_reply(425, "Can't open passive connection");
        return;
}

void
eprt(char *str)
{
        char *end;
        char sep;
        int af;
        int ret;
        int port;

        usedefault = 0;
        if (pdata >= 0) {
            close(pdata);
            pdata = -1;
        }

        sep = *str++;
        if (sep == '\0') {
                reply(500, "Bad syntax in EPRT");
                return;
        }
        af = strtol (str, &end, 0);
        if (af == 0 || *end != sep) {
                reply(500, "Bad syntax in EPRT");
                return;
        }
        str = end + 1;
        switch (af) {
#ifdef HAVE_IPV6
        case 2 :
            data_dest->sa_family = AF_INET6;
            break;
#endif          
        case 1 :
            data_dest->sa_family = AF_INET;
                break;
        default :
                reply(522, "Network protocol %d not supported, use (1"
#ifdef HAVE_IPV6
                      ",2"
#endif
                      ")", af);
                return;
        }
        end = strchr (str, sep);
        if (end == NULL) {
                reply(500, "Bad syntax in EPRT");
                return;
        }
        *end = '\0';
        ret = inet_pton (data_dest->sa_family, str,
                         socket_get_address (data_dest));

        if (ret != 1) {
                reply(500, "Bad address syntax in EPRT");
                return;
        }
        str = end + 1;
        port = strtol (str, &end, 0);
        if (port == 0 || *end != sep) {
                reply(500, "Bad port syntax in EPRT");
                return;
        }
        socket_set_port (data_dest, htons(port));
        reply(200, "EPRT command successful.");
}

/*
 * 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, const char *string)
{
        reply(code, "%s: %s.", string, strerror(errno));
}

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

void
list_file(char *file)
{
    if(use_builtin_ls) {
        FILE *dout;
        dout = dataconn(file, -1, "w");
        if (dout == NULL)
            return;
        set_buffer_size(fileno(dout), 0);
        if(builtin_ls(dout, file) == 0)
            reply(226, "Transfer complete.");
        else
            reply(451, "Requested action aborted. Local error in processing.");
        fclose(dout);
        data = -1;
        pdata = -1;
    } else {
#ifdef HAVE_LS_A
        const char *cmd = "/bin/ls -lA %s";
#else
        const char *cmd = "/bin/ls -la %s";
#endif
        retrieve(cmd, file);
    }
}

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|
#ifdef GLOB_MAXPATH
            GLOB_MAXPATH
#else
            GLOB_LIMIT
#endif
            ;

        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;
    }

    while ((dirname = *dirlist++)) {

        if (urgflag && handleoobcmd())
            goto out;

        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) {
                list_file(dirname);
                goto out;
            }
            perror_reply(550, whichf);
            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 = 1;
            }
            snprintf(buf, sizeof(buf), "%s%s\n", dirname,
                     type == TYPE_A ? "\r" : "");
            sec_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 (urgflag && handleoobcmd())
                goto out;

            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 = 1;
                }
                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" : "");
                sec_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.");

out:
    transflag = 0;
    if (dout != NULL){
        sec_write(fileno(dout), buf, 0); /* XXX flush */
            
        fclose(dout);
    }
    data = -1;
    pdata = -1;
    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;
}