crypto/dist/heimdal/appl/ftp/ftpd/ftpd.c

   1 /*
   2  * Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #define FTP_NAMES
  35 #include "ftpd_locl.h"
  36 #ifdef KRB5
  37 #include <krb5.h>
  38 #endif
  39 #include "getarg.h"
  40
  41 __RCSID("$Heimdal: ftpd.c 21222 2007-06-20 10:11:14Z lha $"
  42         "$NetBSD$");
  43
  44 static char version[] = "Version 6.00";
  45
  46 extern  off_t restart_point;
  47 extern  char cbuf[];
  48
  49 struct  sockaddr_storage ctrl_addr_ss;
  50 struct  sockaddr *ctrl_addr = (struct sockaddr *)&ctrl_addr_ss;
  51
  52 struct  sockaddr_storage data_source_ss;
  53 struct  sockaddr *data_source = (struct sockaddr *)&data_source_ss;
  54
  55 struct  sockaddr_storage data_dest_ss;
  56 struct  sockaddr *data_dest = (struct sockaddr *)&data_dest_ss;
  57
  58 struct  sockaddr_storage his_addr_ss;
  59 struct  sockaddr *his_addr = (struct sockaddr *)&his_addr_ss;
  60
  61 struct  sockaddr_storage pasv_addr_ss;
  62 struct  sockaddr *pasv_addr = (struct sockaddr *)&pasv_addr_ss;
  63
  64 int     data;
  65 int     logged_in;
  66 struct  passwd *pw;
  67 int     debug = 0;
  68 int     ftpd_timeout = 900;    /* timeout after 15 minutes of inactivity */
  69 int     maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */
  70 int     restricted_data_ports = 1;
  71 int     logging;
  72 int     guest;
  73 int     dochroot;
  74 int     type;
  75 int     form;
  76 int     stru;                   /* avoid C keyword */
  77 int     mode;
  78 int     usedefault = 1;         /* for data transfers */
  79 int     pdata = -1;             /* for passive mode */
  80 int     allow_insecure_oob = 1;
  81 static int transflag;
  82 static int urgflag;
  83 off_t   file_size;
  84 off_t   byte_count;
  85 #if !defined(CMASK) || CMASK == 0
  86 #undef CMASK
  87 #define CMASK 027
  88 #endif
  89 int     defumask = CMASK;               /* default umask value */
  90 int     guest_umask = 0777;     /* Paranoia for anonymous users */
  91 char    tmpline[10240];
  92 char    hostname[MaxHostNameLen];
  93 char    remotehost[MaxHostNameLen];
  94 static char ttyline[20];
  95
  96 #define AUTH_PLAIN      (1 << 0) /* allow sending passwords */
  97 #define AUTH_OTP        (1 << 1) /* passwords are one-time */
  98 #define AUTH_FTP        (1 << 2) /* allow anonymous login */
  99
 100 static int auth_level = 0; /* Only allow kerberos login by default */
 101
 102 /*
 103  * Timeout intervals for retrying connections
 104  * to hosts that don't accept PORT cmds.  This
 105  * is a kludge, but given the problems with TCP...
 106  */
 107 #define SWAITMAX        90      /* wait at most 90 seconds */
 108 #define SWAITINT        5       /* interval between retries */
 109
 110 int     swaitmax = SWAITMAX;
 111 int     swaitint = SWAITINT;
 112
 113 #ifdef HAVE_SETPROCTITLE
 114 char    proctitle[BUFSIZ];      /* initial part of title */
 115 #endif /* HAVE_SETPROCTITLE */
 116
 117 #define LOGCMD(cmd, file) \
 118         if (logging > 1) \
 119             syslog(LOG_INFO,"%s %s%s", cmd, \
 120                 *(file) == '/' ? "" : curdir(), file);
 121 #define LOGCMD2(cmd, file1, file2) \
 122          if (logging > 1) \
 123             syslog(LOG_INFO,"%s %s%s %s%s", cmd, \
 124                 *(file1) == '/' ? "" : curdir(), file1, \
 125                 *(file2) == '/' ? "" : curdir(), file2);
 126 #define LOGBYTES(cmd, file, cnt) \
 127         if (logging > 1) { \
 128                 if (cnt == (off_t)-1) \
 129                     syslog(LOG_INFO,"%s %s%s", cmd, \
 130                         *(file) == '/' ? "" : curdir(), file); \
 131                 else \
 132                     syslog(LOG_INFO, "%s %s%s = %ld bytes", \
 133                         cmd, (*(file) == '/') ? "" : curdir(), file, (long)cnt); \
 134         }
 135
 136 static void      ack (char *);
 137 static void      myoob (int);
 138 static int       handleoobcmd(void);
 139 static int       checkuser (char *, char *);
 140 static int       checkaccess (char *);
 141 static FILE     *dataconn (const char *, off_t, const char *);
 142 static void      dolog (struct sockaddr *, int);
 143 static void      end_login (void);
 144 static FILE     *getdatasock (const char *, int);
 145 static char     *gunique (char *);
 146 static RETSIGTYPE        lostconn (int);
 147 static int       receive_data (FILE *, FILE *);
 148 static void      send_data (FILE *, FILE *);
 149 static struct passwd * sgetpwnam (char *);
 150
 151 static char *
 152 curdir(void)
 153 {
 154         static char path[MaxPathLen+1]; /* path + '/' + '\0' */
 155
 156         if (getcwd(path, sizeof(path)-1) == NULL)
 157                 return ("");
 158         if (path[1] != '\0')            /* special case for root dir. */
 159                 strlcat(path, "/", sizeof(path));
 160         /* For guest account, skip / since it's chrooted */
 161         return (guest ? path+1 : path);
 162 }
 163
 164 #ifndef LINE_MAX
 165 #define LINE_MAX 1024
 166 #endif
 167
 168 static int
 169 parse_auth_level(char *str)
 170 {
 171     char *p;
 172     int ret = 0;
 173     char *foo = NULL;
 174
 175     for(p = strtok_r(str, ",", &foo);
 176         p;
 177         p = strtok_r(NULL, ",", &foo)) {
 178         if(strcmp(p, "user") == 0)
 179             ;
 180 #ifdef OTP
 181         else if(strcmp(p, "otp") == 0)
 182             ret |= AUTH_PLAIN|AUTH_OTP;
 183 #endif
 184         else if(strcmp(p, "ftp") == 0 ||
 185                 strcmp(p, "safe") == 0)
 186             ret |= AUTH_FTP;
 187         else if(strcmp(p, "plain") == 0)
 188             ret |= AUTH_PLAIN;
 189         else if(strcmp(p, "none") == 0)
 190             ret |= AUTH_PLAIN|AUTH_FTP;
 191         else
 192             warnx("bad value for -a: `%s'", p);
 193     }
 194     return ret;
 195 }
 196
 197 /*
 198  * Print usage and die.
 199  */
 200
 201 static int interactive_flag;
 202 static char *guest_umask_string;
 203 static char *port_string;
 204 static char *umask_string;
 205 static char *auth_string;
 206
 207 int use_builtin_ls = -1;
 208
 209 static int help_flag;
 210 static int version_flag;
 211
 212 static const char *good_chars = "+-=_,.";
 213
 214 struct getargs args[] = {
 215     { NULL, 'a', arg_string, &auth_string, "required authentication" },
 216     { NULL, 'i', arg_flag, &interactive_flag, "don't assume stdin is a socket" },
 217     { NULL, 'p', arg_string, &port_string, "what port to listen to" },
 218     { NULL, 'g', arg_string, &guest_umask_string, "umask for guest logins" },
 219     { NULL, 'l', arg_counter, &logging, "log more stuff", "" },
 220     { NULL, 't', arg_integer, &ftpd_timeout, "initial timeout" },
 221     { NULL, 'T', arg_integer, &maxtimeout, "max timeout" },
 222     { NULL, 'u', arg_string, &umask_string, "umask for user logins" },
 223     { NULL, 'U', arg_negative_flag, &restricted_data_ports, "don't use high data ports" },
 224     { NULL, 'd', arg_flag, &debug, "enable debugging" },
 225     { NULL, 'v', arg_flag, &debug, "enable debugging" },
 226     { "builtin-ls", 'B', arg_flag, &use_builtin_ls, "use built-in ls to list files" },
 227     { "good-chars", 0, arg_string, &good_chars, "allowed anonymous upload filename chars" },
 228     { "insecure-oob", 'I', arg_negative_flag, &allow_insecure_oob, "don't allow insecure OOB ABOR/STAT" },
 229 #ifdef KRB5
 230     { "gss-bindings", 0,  arg_flag, &ftp_do_gss_bindings, "Require GSS-API bindings", NULL},
 231 #endif
 232     { "version", 0, arg_flag, &version_flag },
 233     { "help", 'h', arg_flag, &help_flag }
 234 };
 235
 236 static int num_args = sizeof(args) / sizeof(args[0]);
 237
 238 static void
 239 usage (int code)
 240 {
 241     arg_printusage(args, num_args, NULL, "");
 242     exit (code);
 243 }
 244
 245 /* output contents of a file */
 246 static int
 247 show_file(const char *file, int code)
 248 {
 249     FILE *f;
 250     char buf[128];
 251
 252     f = fopen(file, "r");
 253     if(f == NULL)
 254         return -1;
 255     while(fgets(buf, sizeof(buf), f)){
 256         buf[strcspn(buf, "\r\n")] = '\0';
 257         lreply(code, "%s", buf);
 258     }
 259     fclose(f);
 260     return 0;
 261 }
 262
 263 int
 264 main(int argc, char **argv)
 265 {
 266     socklen_t his_addr_len, ctrl_addr_len;
 267     int on = 1;
 268     int port;
 269     struct servent *sp;
 270
 271     int optind = 0;
 272
 273     setprogname (argv[0]);
 274
 275     /* detach from any tickets and tokens */
 276     {
 277 #ifdef KRB4
 278         char tkfile[1024];
 279         snprintf(tkfile, sizeof(tkfile),
 280                  "/tmp/ftp_%u", (unsigned)getpid());
 281         krb_set_tkt_string(tkfile);
 282 #endif
 283     }
 284
 285     if(getarg(args, num_args, argc, argv, &optind))
 286         usage(1);
 287
 288     if(help_flag)
 289         usage(0);
 290
 291     if(version_flag) {
 292         print_version(NULL);
 293         exit(0);
 294     }
 295
 296     if(auth_string)
 297         auth_level = parse_auth_level(auth_string);
 298     {
 299         char *p;
 300         long val = 0;
 301
 302         if(guest_umask_string) {
 303             val = strtol(guest_umask_string, &p, 8);
 304             if (*p != '\0' || val < 0)
 305                 warnx("bad value for -g");
 306             else
 307                 guest_umask = val;
 308         }
 309         if(umask_string) {
 310             val = strtol(umask_string, &p, 8);
 311             if (*p != '\0' || val < 0)
 312                 warnx("bad value for -u");
 313             else
 314                 defumask = val;
 315         }
 316     }
 317     sp = getservbyname("ftp", "tcp");
 318     if(sp)
 319         port = sp->s_port;
 320     else
 321         port = htons(21);
 322     if(port_string) {
 323         sp = getservbyname(port_string, "tcp");
 324         if(sp)
 325             port = sp->s_port;
 326         else
 327             if(isdigit((unsigned char)port_string[0]))
 328                 port = htons(atoi(port_string));
 329             else
 330                 warnx("bad value for -p");
 331     }
 332
 333     if (maxtimeout < ftpd_timeout)
 334         maxtimeout = ftpd_timeout;
 335
 336 #if 0
 337     if (ftpd_timeout > maxtimeout)
 338         ftpd_timeout = maxtimeout;
 339 #endif
 340
 341     if(interactive_flag)
 342         mini_inetd (port);
 343
 344     /*
 345      * LOG_NDELAY sets up the logging connection immediately,
 346      * necessary for anonymous ftp's that chroot and can't do it later.
 347      */
 348     openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP);
 349     his_addr_len = sizeof(his_addr_ss);
 350     if (getpeername(STDIN_FILENO, his_addr, &his_addr_len) < 0) {
 351         syslog(LOG_ERR, "getpeername (%s): %m",argv[0]);
 352         exit(1);
 353     }
 354     ctrl_addr_len = sizeof(ctrl_addr_ss);
 355     if (getsockname(STDIN_FILENO, ctrl_addr, &ctrl_addr_len) < 0) {
 356         syslog(LOG_ERR, "getsockname (%s): %m",argv[0]);
 357         exit(1);
 358     }
 359 #if defined(IP_TOS) && defined(HAVE_SETSOCKOPT)
 360     {
 361         int tos = IPTOS_LOWDELAY;
 362
 363         if (setsockopt(STDIN_FILENO, IPPROTO_IP, IP_TOS,
 364                        (void *)&tos, sizeof(int)) < 0)
 365             syslog(LOG_WARNING, "setsockopt (IP_TOS): %m");
 366     }
 367 #endif
 368     data_source->sa_family = ctrl_addr->sa_family;
 369     socket_set_port (data_source,
 370                      htons(ntohs(socket_get_port(ctrl_addr)) - 1));
 371
 372     /* set this here so it can be put in wtmp */
 373     snprintf(ttyline, sizeof(ttyline), "ftp%u", (unsigned)getpid());
 374
 375
 376     /*  freopen(_PATH_DEVNULL, "w", stderr); */
 377     signal(SIGPIPE, lostconn);
 378     signal(SIGCHLD, SIG_IGN);
 379 #ifdef SIGURG
 380     if (signal(SIGURG, myoob) == SIG_ERR)
 381         syslog(LOG_ERR, "signal: %m");
 382 #endif
 383
 384     /* Try to handle urgent data inline */
 385 #if defined(SO_OOBINLINE) && defined(HAVE_SETSOCKOPT)
 386     if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (void *)&on,
 387                    sizeof(on)) < 0)
 388         syslog(LOG_ERR, "setsockopt: %m");
 389 #endif
 390
 391 #ifdef  F_SETOWN
 392     if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1)
 393         syslog(LOG_ERR, "fcntl F_SETOWN: %m");
 394 #endif
 395     dolog(his_addr, his_addr_len);
 396     /*
 397      * Set up default state
 398      */
 399     data = -1;
 400     type = TYPE_A;
 401     form = FORM_N;
 402     stru = STRU_F;
 403     mode = MODE_S;
 404     tmpline[0] = '\0';
 405
 406     /* If logins are disabled, print out the message. */
 407     if(show_file(_PATH_NOLOGIN, 530) == 0) {
 408         reply(530, "System not available.");
 409         exit(0);
 410     }
 411     show_file(_PATH_FTPWELCOME, 220);
 412     /* reply(220,) must follow */
 413     gethostname(hostname, sizeof(hostname));
 414
 415     reply(220, "%s FTP server (%s"
 416 #ifdef KRB5
 417           "+%s"
 418 #endif
 419 #ifdef KRB4
 420           "+%s"
 421 #endif
 422           ") ready.", hostname, version
 423 #ifdef KRB5
 424           ,heimdal_version
 425 #endif
 426 #ifdef KRB4
 427           ,krb4_version
 428 #endif
 429           );
 430
 431     for (;;)
 432         yyparse();
 433     /* NOTREACHED */
 434 }
 435
 436 static RETSIGTYPE
 437 lostconn(int signo)
 438 {
 439
 440         if (debug)
 441                 syslog(LOG_DEBUG, "lost connection");
 442         dologout(-1);
 443 }
 444
 445 /*
 446  * Helper function for sgetpwnam().
 447  */
 448 static char *
 449 sgetsave(char *s)
 450 {
 451         char *new = strdup(s);
 452
 453         if (new == NULL) {
 454                 perror_reply(421, "Local resource failure: malloc");
 455                 dologout(1);
 456                 /* NOTREACHED */
 457         }
 458         return new;
 459 }
 460
 461 /*
 462  * Save the result of a getpwnam.  Used for USER command, since
 463  * the data returned must not be clobbered by any other command
 464  * (e.g., globbing).
 465  */
 466 static struct passwd *
 467 sgetpwnam(char *name)
 468 {
 469         static struct passwd save;
 470         struct passwd *p;
 471
 472         if ((p = k_getpwnam(name)) == NULL)
 473                 return (p);
 474         if (save.pw_name) {
 475                 free(save.pw_name);
 476                 free(save.pw_passwd);
 477                 free(save.pw_gecos);
 478                 free(save.pw_dir);
 479                 free(save.pw_shell);
 480         }
 481         save = *p;
 482         save.pw_name = sgetsave(p->pw_name);
 483         save.pw_passwd = sgetsave(p->pw_passwd);
 484         save.pw_gecos = sgetsave(p->pw_gecos);
 485         save.pw_dir = sgetsave(p->pw_dir);
 486         save.pw_shell = sgetsave(p->pw_shell);
 487         return (&save);
 488 }
 489
 490 static int login_attempts;      /* number of failed login attempts */
 491 static int askpasswd;           /* had user command, ask for passwd */
 492 static char curname[10];        /* current USER name */
 493 #ifdef OTP
 494 OtpContext otp_ctx;
 495 #endif
 496
 497 /*
 498  * USER command.
 499  * Sets global passwd pointer pw if named account exists and is acceptable;
 500  * sets askpasswd if a PASS command is expected.  If logged in previously,
 501  * need to reset state.  If name is "ftp" or "anonymous", the name is not in
 502  * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return.
 503  * If account doesn't exist, ask for passwd anyway.  Otherwise, check user
 504  * requesting login privileges.  Disallow anyone who does not have a standard
 505  * shell as returned by getusershell().  Disallow anyone mentioned in the file
 506  * _PATH_FTPUSERS to allow people such as root and uucp to be avoided.
 507  */
 508 void
 509 user(char *name)
 510 {
 511         char *cp, *shell;
 512
 513         if(auth_level == 0 && !sec_complete){
 514             reply(530, "No login allowed without authorization.");
 515             return;
 516         }
 517
 518         if (logged_in) {
 519                 if (guest) {
 520                         reply(530, "Can't change user from guest login.");
 521                         return;
 522                 } else if (dochroot) {
 523                         reply(530, "Can't change user from chroot user.");
 524                         return;
 525                 }
 526                 end_login();
 527         }
 528
 529         guest = 0;
 530         if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) {
 531             if ((auth_level & AUTH_FTP) == 0 ||
 532                 checkaccess("ftp") ||
 533                 checkaccess("anonymous"))
 534                 reply(530, "User %s access denied.", name);
 535             else if ((pw = sgetpwnam("ftp")) != NULL) {
 536                 guest = 1;
 537                 defumask = guest_umask; /* paranoia for incoming */
 538                 askpasswd = 1;
 539                 reply(331, "Guest login ok, type your name as password.");
 540             } else
 541                 reply(530, "User %s unknown.", name);
 542             if (!askpasswd && logging) {
 543                 char data_addr[256];
 544
 545                 if (inet_ntop (his_addr->sa_family,
 546                                socket_get_address(his_addr),
 547                                data_addr, sizeof(data_addr)) == NULL)
 548                         strlcpy (data_addr, "unknown address",
 549                                          sizeof(data_addr));
 550
 551                 syslog(LOG_NOTICE,
 552                        "ANONYMOUS FTP LOGIN REFUSED FROM %s(%s)",
 553                        remotehost, data_addr);
 554             }
 555             return;
 556         }
 557         if((auth_level & AUTH_PLAIN) == 0 && !sec_complete){
 558             reply(530, "Only authorized and anonymous login allowed.");
 559             return;
 560         }
 561         if ((pw = sgetpwnam(name))) {
 562                 if ((shell = pw->pw_shell) == NULL || *shell == 0)
 563                         shell = _PATH_BSHELL;
 564                 while ((cp = getusershell()) != NULL)
 565                         if (strcmp(cp, shell) == 0)
 566                                 break;
 567                 endusershell();
 568
 569                 if (cp == NULL || checkaccess(name)) {
 570                         reply(530, "User %s access denied.", name);
 571                         if (logging) {
 572                                 char data_addr[256];
 573
 574                                 if (inet_ntop (his_addr->sa_family,
 575                                                socket_get_address(his_addr),
 576                                                data_addr,
 577                                                sizeof(data_addr)) == NULL)
 578                                         strlcpy (data_addr,
 579                                                          "unknown address",
 580                                                          sizeof(data_addr));
 581
 582                                 syslog(LOG_NOTICE,
 583                                        "FTP LOGIN REFUSED FROM %s(%s), %s",
 584                                        remotehost,
 585                                        data_addr,
 586                                        name);
 587                         }
 588                         pw = (struct passwd *) NULL;
 589                         return;
 590                 }
 591         }
 592         if (logging)
 593             strlcpy(curname, name, sizeof(curname));
 594         if(sec_complete) {
 595             if(sec_userok(name) == 0) {
 596                 do_login(232, name);
 597                 sec_session(name);
 598             } else
 599                 reply(530, "User %s access denied.", name);
 600         } else {
 601 #ifdef OTP
 602                 char ss[256];
 603
 604                 if (otp_challenge(&otp_ctx, name, ss, sizeof(ss)) == 0) {
 605                         reply(331, "Password %s for %s required.",
 606                               ss, name);
 607                         askpasswd = 1;
 608                 } else
 609 #endif
 610                 if ((auth_level & AUTH_OTP) == 0) {
 611                     reply(331, "Password required for %s.", name);
 612                     askpasswd = 1;
 613                 } else {
 614 #ifdef OTP
 615                     char *s;
 616
 617                     if ((s = otp_error (&otp_ctx)) != NULL)
 618                         lreply(530, "OTP: %s", s);
 619 #endif
 620                     reply(530,
 621                           "Only authorized, anonymous"
 622 #ifdef OTP
 623                           " and OTP "
 624 #endif
 625                           "login allowed.");
 626                 }
 627
 628         }
 629         /*
 630          * Delay before reading passwd after first failed
 631          * attempt to slow down passwd-guessing programs.
 632          */
 633         if (login_attempts)
 634                 sleep(login_attempts);
 635 }
 636
 637 /*
 638  * Check if a user is in the file "fname"
 639  */
 640 static int
 641 checkuser(char *fname, char *name)
 642 {
 643         FILE *fd;
 644         int found = 0;
 645         char *p, line[BUFSIZ];
 646
 647         if ((fd = fopen(fname, "r")) != NULL) {
 648                 while (fgets(line, sizeof(line), fd) != NULL)
 649                         if ((p = strchr(line, '\n')) != NULL) {
 650                                 *p = '\0';
 651                                 if (line[0] == '#')
 652                                         continue;
 653                                 if (strcmp(line, name) == 0) {
 654                                         found = 1;
 655                                         break;
 656                                 }
 657                         }
 658                 fclose(fd);
 659         }
 660         return (found);
 661 }
 662
 663
 664 /*
 665  * Determine whether a user has access, based on information in
 666  * _PATH_FTPUSERS. The users are listed one per line, with `allow'
 667  * or `deny' after the username. If anything other than `allow', or
 668  * just nothing, is given after the username, `deny' is assumed.
 669  *
 670  * If the user is not found in the file, but the pseudo-user `*' is,
 671  * the permission is taken from that line.
 672  *
 673  * This preserves the old semantics where if a user was listed in the
 674  * file he was denied, otherwise he was allowed.
 675  *
 676  * Return 1 if the user is denied, or 0 if he is allowed.  */
 677
 678 static int
 679 match(const char *pattern, const char *string)
 680 {
 681     return fnmatch(pattern, string, FNM_NOESCAPE);
 682 }
 683
 684 static int
 685 checkaccess(char *name)
 686 {
 687 #define ALLOWED         0
 688 #define NOT_ALLOWED     1
 689     FILE *fd;
 690     int allowed = ALLOWED;
 691     char *user, *perm, line[BUFSIZ];
 692     char *foo;
 693
 694     fd = fopen(_PATH_FTPUSERS, "r");
 695
 696     if(fd == NULL)
 697         return allowed;
 698
 699     while (fgets(line, sizeof(line), fd) != NULL)  {
 700         foo = NULL;
 701         user = strtok_r(line, " \t\n", &foo);
 702         if (user == NULL || user[0] == '#')
 703             continue;
 704         perm = strtok_r(NULL, " \t\n", &foo);
 705         if (match(user, name) == 0){
 706             if(perm && strcmp(perm, "allow") == 0)
 707                 allowed = ALLOWED;
 708             else
 709                 allowed = NOT_ALLOWED;
 710             break;
 711         }
 712     }
 713     fclose(fd);
 714     return allowed;
 715 }
 716 #undef  ALLOWED
 717 #undef  NOT_ALLOWED
 718
 719
 720 int do_login(int code, char *passwd)
 721 {
 722     login_attempts = 0;         /* this time successful */
 723     if (setegid((gid_t)pw->pw_gid) < 0) {
 724         reply(550, "Can't set gid.");
 725         return -1;
 726     }
 727     initgroups(pw->pw_name, pw->pw_gid);
 728 #if defined(KRB4) || defined(KRB5)
 729     if(k_hasafs())
 730         k_setpag();
 731 #endif
 732
 733     /* open wtmp before chroot */
 734     ftpd_logwtmp(ttyline, pw->pw_name, remotehost);
 735     logged_in = 1;
 736
 737     dochroot = checkuser(_PATH_FTPCHROOT, pw->pw_name);
 738     if (guest) {
 739         /*
 740          * We MUST do a chdir() after the chroot. Otherwise
 741          * the old current directory will be accessible as "."
 742          * outside the new root!
 743          */
 744         if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) {
 745             reply(550, "Can't set guest privileges.");
 746             return -1;
 747         }
 748     } else if (dochroot) {
 749         if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) {
 750             reply(550, "Can't change root.");
 751             return -1;
 752         }
 753     } else if (chdir(pw->pw_dir) < 0) {
 754         if (chdir("/") < 0) {
 755             reply(530, "User %s: can't change directory to %s.",
 756                   pw->pw_name, pw->pw_dir);
 757             return -1;
 758         } else
 759             lreply(code, "No directory! Logging in with home=/");
 760     }
 761     if (seteuid((uid_t)pw->pw_uid) < 0) {
 762         reply(550, "Can't set uid.");
 763         return -1;
 764     }
 765
 766     if(use_builtin_ls == -1) {
 767         struct stat st;
 768         /* if /bin/ls exist and is a regular file, use it, otherwise
 769            use built-in ls */
 770         if(stat("/bin/ls", &st) == 0 &&
 771            S_ISREG(st.st_mode))
 772             use_builtin_ls = 0;
 773         else
 774             use_builtin_ls = 1;
 775     }
 776
 777     /*
 778      * Display a login message, if it exists.
 779      * N.B. reply(code,) must follow the message.
 780      */
 781     show_file(_PATH_FTPLOGINMESG, code);
 782     if(show_file(_PATH_ISSUE_NET, code) != 0)
 783         show_file(_PATH_ISSUE, code);
 784     if (guest) {
 785         reply(code, "Guest login ok, access restrictions apply.");
 786 #ifdef HAVE_SETPROCTITLE
 787         snprintf (proctitle, sizeof(proctitle),
 788                   "%s: anonymous/%s",
 789                   remotehost,
 790                   passwd);
 791         setproctitle("%s", proctitle);
 792 #endif /* HAVE_SETPROCTITLE */
 793         if (logging) {
 794             char data_addr[256];
 795
 796             if (inet_ntop (his_addr->sa_family,
 797                            socket_get_address(his_addr),
 798                            data_addr, sizeof(data_addr)) == NULL)
 799                 strlcpy (data_addr, "unknown address",
 800                                  sizeof(data_addr));
 801
 802             syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s(%s), %s",
 803                    remotehost,
 804                    data_addr,
 805                    passwd);
 806         }
 807     } else {
 808         reply(code, "User %s logged in.", pw->pw_name);
 809 #ifdef HAVE_SETPROCTITLE
 810         snprintf(proctitle, sizeof(proctitle), "%s: %s", remotehost, pw->pw_name);
 811         setproctitle("%s", proctitle);
 812 #endif /* HAVE_SETPROCTITLE */
 813         if (logging) {
 814             char data_addr[256];
 815
 816             if (inet_ntop (his_addr->sa_family,
 817                            socket_get_address(his_addr),
 818                            data_addr, sizeof(data_addr)) == NULL)
 819                 strlcpy (data_addr, "unknown address",
 820                                  sizeof(data_addr));
 821
 822             syslog(LOG_INFO, "FTP LOGIN FROM %s(%s) as %s",
 823                    remotehost,
 824                    data_addr,
 825                    pw->pw_name);
 826         }
 827     }
 828     umask(defumask);
 829     return 0;
 830 }
 831
 832 /*
 833  * Terminate login as previous user, if any, resetting state;
 834  * used when USER command is given or login fails.
 835  */
 836 static void
 837 end_login(void)
 838 {
 839
 840         if (seteuid((uid_t)0) < 0)
 841                 fatal("Failed to seteuid");
 842         if (logged_in)
 843                 ftpd_logwtmp(ttyline, "", "");
 844         pw = NULL;
 845         logged_in = 0;
 846         guest = 0;
 847         dochroot = 0;
 848 }
 849
 850 #ifdef KRB5
 851 static int
 852 krb5_verify(struct passwd *pwd, char *passwd)
 853 {
 854    krb5_context context;
 855    krb5_ccache  id;
 856    krb5_principal princ;
 857    krb5_error_code ret;
 858
 859    ret = krb5_init_context(&context);
 860    if(ret)
 861         return ret;
 862
 863   ret = krb5_parse_name(context, pwd->pw_name, &princ);
 864   if(ret){
 865         krb5_free_context(context);
 866         return ret;
 867   }
 868   ret = krb5_cc_gen_new(context, &krb5_mcc_ops, &id);
 869   if(ret){
 870         krb5_free_principal(context, princ);
 871         krb5_free_context(context);
 872         return ret;
 873   }
 874   ret = krb5_verify_user(context,
 875                          princ,
 876                          id,
 877                          passwd,
 878                          1,
 879                          NULL);
 880   krb5_free_principal(context, princ);
 881   if (k_hasafs()) {
 882       krb5_afslog_uid_home(context, id,NULL, NULL,pwd->pw_uid, pwd->pw_dir);
 883   }
 884   krb5_cc_destroy(context, id);
 885   krb5_free_context (context);
 886   if(ret)
 887       return ret;
 888   return 0;
 889 }
 890 #endif /* KRB5 */
 891
 892 void
 893 pass(char *passwd)
 894 {
 895         int rval;
 896
 897         /* some clients insists on sending a password */
 898         if (logged_in && askpasswd == 0){
 899             reply(230, "Password not necessary");
 900             return;
 901         }
 902
 903         if (logged_in || askpasswd == 0) {
 904                 reply(503, "Login with USER first.");
 905                 return;
 906         }
 907         askpasswd = 0;
 908         rval = 1;
 909         if (!guest) {           /* "ftp" is only account allowed no password */
 910                 if (pw == NULL)
 911                         rval = 1;       /* failure below */
 912 #ifdef OTP
 913                 else if (otp_verify_user (&otp_ctx, passwd) == 0) {
 914                     rval = 0;
 915                 }
 916 #endif
 917                 else if((auth_level & AUTH_OTP) == 0) {
 918 #ifdef KRB5
 919                     rval = krb5_verify(pw, passwd);
 920 #endif
 921 #ifdef KRB4
 922                     if (rval) {
 923                         char realm[REALM_SZ];
 924                         if((rval = krb_get_lrealm(realm, 1)) == KSUCCESS)
 925                             rval = krb_verify_user(pw->pw_name,
 926                                                    "", realm,
 927                                                    passwd,
 928                                                    KRB_VERIFY_SECURE, NULL);
 929                         if (rval == KSUCCESS ) {
 930                             chown (tkt_string(), pw->pw_uid, pw->pw_gid);
 931                             if(k_hasafs())
 932                                 krb_afslog(0, 0);
 933                         }
 934                     }
 935 #endif
 936                     if (rval)
 937                         rval = unix_verify_user(pw->pw_name, passwd);
 938                 } else {
 939 #ifdef OTP
 940                     char *s;
 941                     if ((s = otp_error(&otp_ctx)) != NULL)
 942                         lreply(530, "OTP: %s", s);
 943 #endif
 944                 }
 945                 memset (passwd, 0, strlen(passwd));
 946
 947                 /*
 948                  * If rval == 1, the user failed the authentication
 949                  * check above.  If rval == 0, either Kerberos or
 950                  * local authentication succeeded.
 951                  */
 952                 if (rval) {
 953                         char data_addr[256];
 954
 955                         if (inet_ntop (his_addr->sa_family,
 956                                        socket_get_address(his_addr),
 957                                        data_addr, sizeof(data_addr)) == NULL)
 958                                 strlcpy (data_addr, "unknown address",
 959                                                  sizeof(data_addr));
 960
 961                         reply(530, "Login incorrect.");
 962                         if (logging)
 963                                 syslog(LOG_NOTICE,
 964                                     "FTP LOGIN FAILED FROM %s(%s), %s",
 965                                        remotehost,
 966                                        data_addr,
 967                                        curname);
 968                         pw = NULL;
 969                         if (login_attempts++ >= 5) {
 970                                 syslog(LOG_NOTICE,
 971                                        "repeated login failures from %s(%s)",
 972                                        remotehost,
 973                                        data_addr);
 974                                 exit(0);
 975                         }
 976                         return;
 977                 }
 978         }
 979         if(!do_login(230, passwd))
 980           return;
 981
 982         /* Forget all about it... */
 983         end_login();
 984 }
 985
 986 void
 987 retrieve(const char *cmd, char *name)
 988 {
 989         FILE *fin = NULL, *dout;
 990         struct stat st;
 991         int (*closefunc) (FILE *);
 992         char line[BUFSIZ];
 993
 994
 995         if (cmd == 0) {
 996                 fin = fopen(name, "r");
 997                 closefunc = fclose;
 998                 st.st_size = 0;
 999                 if(fin == NULL){
1000                     int save_errno = errno;
1001                     struct cmds {
1002                         const char *ext;
1003                         const char *cmd;
1004                         const char *rev_cmd;
1005                     } cmds[] = {
1006                         {".tar", "/bin/gtar cPf - %s", NULL},
1007                         {".tar.gz", "/bin/gtar zcPf - %s", NULL},
1008                         {".tar.Z", "/bin/gtar ZcPf - %s", NULL},
1009                         {".gz", "/bin/gzip -c -- %s", "/bin/gzip -c -d -- %s"},
1010                         {".Z", "/bin/compress -c -- %s", "/bin/uncompress -c -- %s"},
1011                         {NULL, NULL}
1012                     };
1013                     struct cmds *p;
1014                     for(p = cmds; p->ext; p++){
1015                         char *tail = name + strlen(name) - strlen(p->ext);
1016                         char c = *tail;
1017
1018                         if(strcmp(tail, p->ext) == 0 &&
1019                            (*tail  = 0) == 0 &&
1020                            access(name, R_OK) == 0){
1021                             snprintf (line, sizeof(line), p->cmd, name);
1022                             *tail  = c;
1023                             break;
1024                         }
1025                         *tail = c;
1026                         if (p->rev_cmd != NULL) {
1027                             char *ext;
1028                             int ret;
1029
1030                             ret = asprintf(&ext, "%s%s", name, p->ext);
1031                             if (ret != -1) {
1032                                 if (access(ext, R_OK) == 0) {
1033                                     snprintf (line, sizeof(line),
1034                                               p->rev_cmd, ext);
1035                                     free(ext);
1036                                     break;
1037                                 }
1038                                 free(ext);
1039                             }
1040                         }
1041
1042                     }
1043                     if(p->ext){
1044                         fin = ftpd_popen(line, "r", 0, 0);
1045                         closefunc = ftpd_pclose;
1046                         st.st_size = -1;
1047                         cmd = line;
1048                     } else
1049                         errno = save_errno;
1050                 }
1051         } else {
1052                 snprintf(line, sizeof(line), cmd, name);
1053                 name = line;
1054                 fin = ftpd_popen(line, "r", 1, 0);
1055                 closefunc = ftpd_pclose;
1056                 st.st_size = -1;
1057         }
1058         if (fin == NULL) {
1059                 if (errno != 0) {
1060                         perror_reply(550, name);
1061                         if (cmd == 0) {
1062                                 LOGCMD("get", name);
1063                         }
1064                 }
1065                 return;
1066         }
1067         byte_count = -1;
1068         if (cmd == 0){
1069             if(fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode)) {
1070                 reply(550, "%s: not a plain file.", name);
1071                 goto done;
1072             }
1073         }
1074         if (restart_point) {
1075                 if (type == TYPE_A) {
1076                         off_t i, n;
1077                         int c;
1078
1079                         n = restart_point;
1080                         i = 0;
1081                         while (i++ < n) {
1082                                 if ((c=getc(fin)) == EOF) {
1083                                         perror_reply(550, name);
1084                                         goto done;
1085                                 }
1086                                 if (c == '\n')
1087                                         i++;
1088                         }
1089                 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) {
1090                         perror_reply(550, name);
1091                         goto done;
1092                 }
1093         }
1094         dout = dataconn(name, st.st_size, "w");
1095         if (dout == NULL)
1096                 goto done;
1097         set_buffer_size(fileno(dout), 0);
1098         send_data(fin, dout);
1099         fclose(dout);
1100         data = -1;
1101         pdata = -1;
1102 done:
1103         if (cmd == 0)
1104                 LOGBYTES("get", name, byte_count);
1105         (*closefunc)(fin);
1106 }
1107
1108 /* filename sanity check */
1109
1110 int
1111 filename_check(char *filename)
1112 {
1113     char *p;
1114
1115     p = strrchr(filename, '/');
1116     if(p)
1117         filename = p + 1;
1118
1119     p = filename;
1120
1121     if(isalnum((unsigned char)*p)){
1122         p++;
1123         while(*p && (isalnum((unsigned char)*p) || strchr(good_chars, (unsigned char)*p)))
1124             p++;
1125         if(*p == '\0')
1126             return 0;
1127     }
1128     lreply(553, "\"%s\" is not an acceptable filename.", filename);
1129     lreply(553, "The filename must start with an alphanumeric "
1130            "character and must only");
1131     reply(553, "consist of alphanumeric characters or any of the following: %s",
1132           good_chars);
1133     return 1;
1134 }
1135
1136 void
1137 do_store(char *name, char *mode, int unique)
1138 {
1139         FILE *fout, *din;
1140         struct stat st;
1141         int (*closefunc) (FILE *);
1142
1143         if(guest && filename_check(name))
1144             return;
1145         if (unique && stat(name, &st) == 0 &&
1146             (name = gunique(name)) == NULL) {
1147                 LOGCMD(*mode == 'w' ? "put" : "append", name);
1148                 return;
1149         }
1150
1151         if (restart_point)
1152                 mode = "r+";
1153         fout = fopen(name, mode);
1154         closefunc = fclose;
1155         if (fout == NULL) {
1156                 perror_reply(553, name);
1157                 LOGCMD(*mode == 'w' ? "put" : "append", name);
1158                 return;
1159         }
1160         byte_count = -1;
1161         if (restart_point) {
1162                 if (type == TYPE_A) {
1163                         off_t i, n;
1164                         int c;
1165
1166                         n = restart_point;
1167                         i = 0;
1168                         while (i++ < n) {
1169                                 if ((c=getc(fout)) == EOF) {
1170                                         perror_reply(550, name);
1171                                         goto done;
1172                                 }
1173                                 if (c == '\n')
1174                                         i++;
1175                         }
1176                         /*
1177                          * We must do this seek to "current" position
1178                          * because we are changing from reading to
1179                          * writing.
1180                          */
1181                         if (fseek(fout, 0L, SEEK_CUR) < 0) {
1182                                 perror_reply(550, name);
1183                                 goto done;
1184                         }
1185                 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) {
1186                         perror_reply(550, name);
1187                         goto done;
1188                 }
1189         }
1190         din = dataconn(name, (off_t)-1, "r");
1191         if (din == NULL)
1192                 goto done;
1193         set_buffer_size(fileno(din), 1);
1194         if (receive_data(din, fout) == 0) {
1195             if((*closefunc)(fout) < 0)
1196                 perror_reply(552, name);
1197             else {
1198                 if (unique)
1199                         reply(226, "Transfer complete (unique file name:%s).",
1200                             name);
1201                 else
1202                         reply(226, "Transfer complete.");
1203             }
1204         } else
1205             (*closefunc)(fout);
1206         fclose(din);
1207         data = -1;
1208         pdata = -1;
1209 done:
1210         LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count);
1211 }
1212
1213 static FILE *
1214 getdatasock(const char *mode, int domain)
1215 {
1216         int s, t, tries;
1217
1218         if (data >= 0)
1219                 return (fdopen(data, mode));
1220         if (seteuid(0) < 0)
1221                 fatal("Failed to seteuid");
1222         s = socket(domain, SOCK_STREAM, 0);
1223         if (s < 0)
1224                 goto bad;
1225         socket_set_reuseaddr (s, 1);
1226         /* anchor socket to avoid multi-homing problems */
1227         socket_set_address_and_port (data_source,
1228                                      socket_get_address (ctrl_addr),
1229                                      socket_get_port (data_source));
1230
1231         for (tries = 1; ; tries++) {
1232                 if (bind(s, data_source,
1233                          socket_sockaddr_size (data_source)) >= 0)
1234                         break;
1235                 if (errno != EADDRINUSE || tries > 10)
1236                         goto bad;
1237                 sleep(tries);
1238         }
1239         if (seteuid(pw->pw_uid) < 0)
1240                 fatal("Failed to seteuid");
1241 #ifdef IPTOS_THROUGHPUT
1242         socket_set_tos (s, IPTOS_THROUGHPUT);
1243 #endif
1244         return (fdopen(s, mode));
1245 bad:
1246         /* Return the real value of errno (close may change it) */
1247         t = errno;
1248         if (seteuid((uid_t)pw->pw_uid) < 0)
1249                 fatal("Failed to seteuid");
1250         close(s);
1251         errno = t;
1252         return (NULL);
1253 }
1254
1255 static int
1256 accept_with_timeout(int socket,
1257                     struct sockaddr *address,
1258                     socklen_t *address_len,
1259                     struct timeval *timeout)
1260 {
1261     int ret;
1262     fd_set rfd;
1263     FD_ZERO(&rfd);
1264     FD_SET(socket, &rfd);
1265     ret = select(socket + 1, &rfd, NULL, NULL, timeout);
1266     if(ret < 0)
1267         return ret;
1268     if(ret == 0) {
1269         errno = ETIMEDOUT;
1270         return -1;
1271     }
1272     return accept(socket, address, address_len);
1273 }
1274
1275 static FILE *
1276 dataconn(const char *name, off_t size, const char *mode)
1277 {
1278         char sizebuf[32];
1279         FILE *file;
1280         int domain, retry = 0;
1281
1282         file_size = size;
1283         byte_count = 0;
1284         if (size >= 0)
1285             snprintf(sizebuf, sizeof(sizebuf), " (%ld bytes)", (long)size);
1286         else
1287             *sizebuf = '\0';
1288         if (pdata >= 0) {
1289                 struct sockaddr_storage from_ss;
1290                 struct sockaddr *from = (struct sockaddr *)&from_ss;
1291                 struct timeval timeout;
1292                 int s;
1293                 socklen_t fromlen = sizeof(from_ss);
1294
1295                 timeout.tv_sec = 15;
1296                 timeout.tv_usec = 0;
1297                 s = accept_with_timeout(pdata, from, &fromlen, &timeout);
1298                 if (s < 0) {
1299                         reply(425, "Can't open data connection.");
1300                         close(pdata);
1301                         pdata = -1;
1302                         return (NULL);
1303                 }
1304                 close(pdata);
1305                 pdata = s;
1306 #if defined(IP_TOS) && defined(HAVE_SETSOCKOPT)
1307                 {
1308                     int tos = IPTOS_THROUGHPUT;
1309
1310                     setsockopt(s, IPPROTO_IP, IP_TOS, (void *)&tos,
1311                                sizeof(tos));
1312                 }
1313 #endif
1314                 reply(150, "Opening %s mode data connection for '%s'%s.",
1315                      type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf);
1316                 return (fdopen(pdata, mode));
1317         }
1318         if (data >= 0) {
1319                 reply(125, "Using existing data connection for '%s'%s.",
1320                     name, sizebuf);
1321                 usedefault = 1;
1322                 return (fdopen(data, mode));
1323         }
1324         if (usedefault)
1325                 data_dest = his_addr;
1326         usedefault = 1;
1327         /*
1328          * Default to using the same socket type as the ctrl address,
1329          * unless we know the type of the data address.
1330          */
1331         domain = data_dest->sa_family;
1332         if (domain == PF_UNSPEC)
1333             domain = ctrl_addr->sa_family;
1334
1335         file = getdatasock(mode, domain);
1336         if (file == NULL) {
1337                 char data_addr[256];
1338
1339                 if (inet_ntop (data_source->sa_family,
1340                                socket_get_address(data_source),
1341                                data_addr, sizeof(data_addr)) == NULL)
1342                         strlcpy (data_addr, "unknown address",
1343                                          sizeof(data_addr));
1344
1345                 reply(425, "Can't create data socket (%s,%d): %s.",
1346                       data_addr,
1347                       socket_get_port (data_source),
1348                       strerror(errno));
1349                 return (NULL);
1350         }
1351         data = fileno(file);
1352         while (connect(data, data_dest,
1353                        socket_sockaddr_size(data_dest)) < 0) {
1354                 if (errno == EADDRINUSE && retry < swaitmax) {
1355                         sleep(swaitint);
1356                         retry += swaitint;
1357                         continue;
1358                 }
1359                 perror_reply(425, "Can't build data connection");
1360                 fclose(file);
1361                 data = -1;
1362                 return (NULL);
1363         }
1364         reply(150, "Opening %s mode data connection for '%s'%s.",
1365              type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf);
1366         return (file);
1367 }
1368
1369 /*
1370  * Tranfer the contents of "instr" to "outstr" peer using the appropriate
1371  * encapsulation of the data subject * to Mode, Structure, and Type.
1372  *
1373  * NB: Form isn't handled.
1374  */
1375 static void
1376 send_data(FILE *instr, FILE *outstr)
1377 {
1378         int c, cnt, filefd, netfd;
1379         static char *buf;
1380         static size_t bufsize;
1381
1382         transflag = 1;
1383         switch (type) {
1384
1385         case TYPE_A:
1386             while ((c = getc(instr)) != EOF) {
1387                 if (urgflag && handleoobcmd())
1388                     return;
1389                 byte_count++;
1390                 if(c == '\n')
1391                     sec_putc('\r', outstr);
1392                 sec_putc(c, outstr);
1393             }
1394             sec_fflush(outstr);
1395             transflag = 0;
1396             urgflag = 0;
1397             if (ferror(instr))
1398                 goto file_err;
1399             if (ferror(outstr))
1400                 goto data_err;
1401             reply(226, "Transfer complete.");
1402             return;
1403
1404         case TYPE_I:
1405         case TYPE_L:
1406 #if 0 /* XXX handle urg flag */
1407 #if defined(HAVE_MMAP) && !defined(NO_MMAP)
1408 #ifndef MAP_FAILED
1409 #define MAP_FAILED (-1)
1410 #endif
1411             {
1412                 struct stat st;
1413                 char *chunk;
1414                 int in = fileno(instr);
1415                 if(fstat(in, &st) == 0 && S_ISREG(st.st_mode)
1416                    && st.st_size > 0) {
1417                     /*
1418                      * mmap zero bytes has potential of loosing, don't do it.
1419                      */
1420                     chunk = mmap(0, st.st_size, PROT_READ,
1421                                  MAP_SHARED, in, 0);
1422                     if((void *)chunk != (void *)MAP_FAILED) {
1423                         cnt = st.st_size - restart_point;
1424                         sec_write(fileno(outstr), chunk + restart_point, cnt);
1425                         if (munmap(chunk, st.st_size) < 0)
1426                             warn ("munmap");
1427                         sec_fflush(outstr);
1428                         byte_count = cnt;
1429                         transflag = 0;
1430                         urgflag = 0;
1431                     }
1432                 }
1433             }
1434 #endif
1435 #endif
1436         if(transflag) {
1437             struct stat st;
1438
1439             netfd = fileno(outstr);
1440             filefd = fileno(instr);
1441             buf = alloc_buffer (buf, &bufsize,
1442                                 fstat(filefd, &st) >= 0 ? &st : NULL);
1443             if (buf == NULL) {
1444                 transflag = 0;
1445                 urgflag = 0;
1446                 perror_reply(451, "Local resource failure: malloc");
1447                 return;
1448             }
1449             while ((cnt = read(filefd, buf, bufsize)) > 0 &&
1450                    sec_write(netfd, buf, cnt) == cnt) {
1451                 byte_count += cnt;
1452                 if (urgflag && handleoobcmd())
1453                     return;
1454             }
1455             sec_fflush(outstr); /* to end an encrypted stream */
1456             transflag = 0;
1457             urgflag = 0;
1458             if (cnt != 0) {
1459                 if (cnt < 0)
1460                     goto file_err;
1461                 goto data_err;
1462             }
1463         }
1464         reply(226, "Transfer complete.");
1465         return;
1466         default:
1467             transflag = 0;
1468             urgflag = 0;
1469             reply(550, "Unimplemented TYPE %d in send_data", type);
1470             return;
1471         }
1472
1473 data_err:
1474         transflag = 0;
1475         urgflag = 0;
1476         perror_reply(426, "Data connection");
1477         return;
1478
1479 file_err:
1480         transflag = 0;
1481         urgflag = 0;
1482         perror_reply(551, "Error on input file");
1483 }
1484
1485 /*
1486  * Transfer data from peer to "outstr" using the appropriate encapulation of
1487  * the data subject to Mode, Structure, and Type.
1488  *
1489  * N.B.: Form isn't handled.
1490  */
1491 static int
1492 receive_data(FILE *instr, FILE *outstr)
1493 {
1494     int cnt, bare_lfs = 0;
1495     static char *buf;
1496     static size_t bufsize;
1497     struct stat st;
1498
1499     transflag = 1;
1500
1501     buf = alloc_buffer (buf, &bufsize,
1502                         fstat(fileno(outstr), &st) >= 0 ? &st : NULL);
1503     if (buf == NULL) {
1504         transflag = 0;
1505         urgflag = 0;
1506         perror_reply(451, "Local resource failure: malloc");
1507         return -1;
1508     }
1509
1510     switch (type) {
1511
1512     case TYPE_I:
1513     case TYPE_L:
1514         while ((cnt = sec_read(fileno(instr), buf, bufsize)) > 0) {
1515             if (write(fileno(outstr), buf, cnt) != cnt)
1516                 goto file_err;
1517             byte_count += cnt;
1518             if (urgflag && handleoobcmd())
1519                 return (-1);
1520         }
1521         if (cnt < 0)
1522             goto data_err;
1523         transflag = 0;
1524         urgflag = 0;
1525         return (0);
1526
1527     case TYPE_E:
1528         reply(553, "TYPE E not implemented.");
1529         transflag = 0;
1530         urgflag = 0;
1531         return (-1);
1532
1533     case TYPE_A:
1534     {
1535         char *p, *q;
1536         int cr_flag = 0;
1537         while ((cnt = sec_read(fileno(instr),
1538                                 buf + cr_flag,
1539                                 bufsize - cr_flag)) > 0){
1540             if (urgflag && handleoobcmd())
1541                 return (-1);
1542             byte_count += cnt;
1543             cnt += cr_flag;
1544             cr_flag = 0;
1545             for(p = buf, q = buf; p < buf + cnt;) {
1546                 if(*p == '\n')
1547                     bare_lfs++;
1548                 if(*p == '\r') {
1549                     if(p == buf + cnt - 1){
1550                         cr_flag = 1;
1551                         p++;
1552                         continue;
1553                     }else if(p[1] == '\n'){
1554                         *q++ = '\n';
1555                         p += 2;
1556                         continue;
1557                     }
1558                 }
1559                 *q++ = *p++;
1560             }
1561             fwrite(buf, q - buf, 1, outstr);
1562             if(cr_flag)
1563                 buf[0] = '\r';
1564         }
1565         if(cr_flag)
1566             putc('\r', outstr);
1567         fflush(outstr);
1568         if (ferror(instr))
1569             goto data_err;
1570         if (ferror(outstr))
1571             goto file_err;
1572         transflag = 0;
1573         urgflag = 0;
1574         if (bare_lfs) {
1575             lreply(226, "WARNING! %d bare linefeeds received in ASCII mode\r\n"
1576                    "    File may not have transferred correctly.\r\n",
1577                    bare_lfs);
1578         }
1579         return (0);
1580     }
1581     default:
1582         reply(550, "Unimplemented TYPE %d in receive_data", type);
1583         transflag = 0;
1584         urgflag = 0;
1585         return (-1);
1586     }
1587
1588 data_err:
1589     transflag = 0;
1590     urgflag = 0;
1591     perror_reply(426, "Data Connection");
1592     return (-1);
1593
1594 file_err:
1595     transflag = 0;
1596     urgflag = 0;
1597     perror_reply(452, "Error writing file");
1598     return (-1);
1599 }
1600
1601 void
1602 statfilecmd(char *filename)
1603 {
1604         FILE *fin;
1605         int c;
1606         char line[LINE_MAX];
1607
1608         snprintf(line, sizeof(line), "/bin/ls -la -- %s", filename);
1609         fin = ftpd_popen(line, "r", 1, 0);
1610         lreply(211, "status of %s:", filename);
1611         while ((c = getc(fin)) != EOF) {
1612                 if (c == '\n') {
1613                         if (ferror(stdout)){
1614                                 perror_reply(421, "control connection");
1615                                 ftpd_pclose(fin);
1616                                 dologout(1);
1617                                 /* NOTREACHED */
1618                         }
1619                         if (ferror(fin)) {
1620                                 perror_reply(551, filename);
1621                                 ftpd_pclose(fin);
1622                                 return;
1623                         }
1624                         putc('\r', stdout);
1625                 }
1626                 putc(c, stdout);
1627         }
1628         ftpd_pclose(fin);
1629         reply(211, "End of Status");
1630 }
1631
1632 void
1633 statcmd(void)
1634 {
1635 #if 0
1636         struct sockaddr_in *sin;
1637         u_char *a, *p;
1638
1639         lreply(211, "%s FTP server (%s) status:", hostname, version);
1640         printf("     %s\r\n", version);
1641         printf("     Connected to %s", remotehost);
1642         if (!isdigit((unsigned char)remotehost[0]))
1643                 printf(" (%s)", inet_ntoa(his_addr.sin_addr));
1644         printf("\r\n");
1645         if (logged_in) {
1646                 if (guest)
1647                         printf("     Logged in anonymously\r\n");
1648                 else
1649                         printf("     Logged in as %s\r\n", pw->pw_name);
1650         } else if (askpasswd)
1651                 printf("     Waiting for password\r\n");
1652         else
1653                 printf("     Waiting for user name\r\n");
1654         printf("     TYPE: %s", typenames[type]);
1655         if (type == TYPE_A || type == TYPE_E)
1656                 printf(", FORM: %s", formnames[form]);
1657         if (type == TYPE_L)
1658 #if NBBY == 8
1659                 printf(" %d", NBBY);
1660 #else
1661                 printf(" %d", bytesize);        /* need definition! */
1662 #endif
1663         printf("; STRUcture: %s; transfer MODE: %s\r\n",
1664             strunames[stru], modenames[mode]);
1665         if (data != -1)
1666                 printf("     Data connection open\r\n");
1667         else if (pdata != -1) {
1668                 printf("     in Passive mode");
1669                 sin = &pasv_addr;
1670                 goto printaddr;
1671         } else if (usedefault == 0) {
1672                 printf("     PORT");
1673                 sin = &data_dest;
1674 printaddr:
1675                 a = (u_char *) &sin->sin_addr;
1676                 p = (u_char *) &sin->sin_port;
1677 #define UC(b) (((int) b) & 0xff)
1678                 printf(" (%d,%d,%d,%d,%d,%d)\r\n", UC(a[0]),
1679                         UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1]));
1680 #undef UC
1681         } else
1682                 printf("     No data connection\r\n");
1683 #endif
1684         reply(211, "End of status");
1685 }
1686
1687 void
1688 fatal(char *s)
1689 {
1690
1691         reply(451, "Error in server: %s\n", s);
1692         reply(221, "Closing connection due to server error.");
1693         dologout(0);
1694         /* NOTREACHED */
1695 }
1696
1697 static void
1698 int_reply(int, char *, const char *, va_list)
1699 #ifdef __GNUC__
1700 __attribute__ ((format (printf, 3, 0)))
1701 #endif
1702 ;
1703
1704 static void
1705 int_reply(int n, char *c, const char *fmt, va_list ap)
1706 {
1707     char buf[10240];
1708     char *p;
1709     p=buf;
1710     if(n){
1711         snprintf(p, sizeof(buf), "%d%s", n, c);
1712         p+=strlen(p);
1713     }
1714     vsnprintf(p, sizeof(buf) - strlen(p), fmt, ap);
1715     p+=strlen(p);
1716     snprintf(p, sizeof(buf) - strlen(p), "\r\n");
1717     p+=strlen(p);
1718     sec_fprintf(stdout, "%s", buf);
1719     fflush(stdout);
1720     if (debug)
1721         syslog(LOG_DEBUG, "<--- %s- ", buf);
1722 }
1723
1724 void
1725 reply(int n, const char *fmt, ...)
1726 {
1727   va_list ap;
1728   va_start(ap, fmt);
1729   int_reply(n, " ", fmt, ap);
1730   delete_ftp_command();
1731   va_end(ap);
1732 }
1733
1734 void
1735 lreply(int n, const char *fmt, ...)
1736 {
1737   va_list ap;
1738   va_start(ap, fmt);
1739   int_reply(n, "-", fmt, ap);
1740   va_end(ap);
1741 }
1742
1743 void
1744 nreply(const char *fmt, ...)
1745 {
1746   va_list ap;
1747   va_start(ap, fmt);
1748   int_reply(0, NULL, fmt, ap);
1749   va_end(ap);
1750 }
1751
1752 static void
1753 ack(char *s)
1754 {
1755
1756         reply(250, "%s command successful.", s);
1757 }
1758
1759 void
1760 nack(char *s)
1761 {
1762
1763         reply(502, "%s command not implemented.", s);
1764 }
1765
1766 void
1767 do_delete(char *name)
1768 {
1769         struct stat st;
1770
1771         LOGCMD("delete", name);
1772         if (stat(name, &st) < 0) {
1773                 perror_reply(550, name);
1774                 return;
1775         }
1776         if ((st.st_mode&S_IFMT) == S_IFDIR) {
1777                 if (rmdir(name) < 0) {
1778                         perror_reply(550, name);
1779                         return;
1780                 }
1781                 goto done;
1782         }
1783         if (unlink(name) < 0) {
1784                 perror_reply(550, name);
1785                 return;
1786         }
1787 done:
1788         ack("DELE");
1789 }
1790
1791 void
1792 cwd(char *path)
1793 {
1794
1795         if (chdir(path) < 0)
1796                 perror_reply(550, path);
1797         else
1798                 ack("CWD");
1799 }
1800
1801 void
1802 makedir(char *name)
1803 {
1804
1805         LOGCMD("mkdir", name);
1806         if(guest && filename_check(name))
1807             return;
1808         if (mkdir(name, 0777) < 0)
1809                 perror_reply(550, name);
1810         else{
1811             if(guest)
1812                 chmod(name, 0700); /* guest has umask 777 */
1813             reply(257, "MKD command successful.");
1814         }
1815 }
1816
1817 void
1818 removedir(char *name)
1819 {
1820
1821         LOGCMD("rmdir", name);
1822         if (rmdir(name) < 0)
1823                 perror_reply(550, name);
1824         else
1825                 ack("RMD");
1826 }
1827
1828 void
1829 pwd(void)
1830 {
1831     char path[MaxPathLen];
1832     char *ret;
1833
1834     /* SunOS has a broken getcwd that does popen(pwd) (!!!), this
1835      * failes miserably when running chroot
1836      */
1837     ret = getcwd(path, sizeof(path));
1838     if (ret == NULL)
1839         reply(550, "%s.", strerror(errno));
1840     else
1841         reply(257, "\"%s\" is current directory.", path);
1842 }
1843
1844 char *
1845 renamefrom(char *name)
1846 {
1847         struct stat st;
1848
1849         if (stat(name, &st) < 0) {
1850                 perror_reply(550, name);
1851                 return NULL;
1852         }
1853         reply(350, "File exists, ready for destination name");
1854         return (name);
1855 }
1856
1857 void
1858 renamecmd(char *from, char *to)
1859 {
1860
1861         LOGCMD2("rename", from, to);
1862         if(guest && filename_check(to))
1863             return;
1864         if (rename(from, to) < 0)
1865                 perror_reply(550, "rename");
1866         else
1867                 ack("RNTO");
1868 }
1869
1870 static void
1871 dolog(struct sockaddr *sa, int len)
1872 {
1873         getnameinfo_verified (sa, len, remotehost, sizeof(remotehost),
1874                               NULL, 0, 0);
1875 #ifdef HAVE_SETPROCTITLE
1876         snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost);
1877         setproctitle("%s", proctitle);
1878 #endif /* HAVE_SETPROCTITLE */
1879
1880         if (logging) {
1881                 char data_addr[256];
1882
1883                 if (inet_ntop (his_addr->sa_family,
1884                                socket_get_address(his_addr),
1885                                data_addr, sizeof(data_addr)) == NULL)
1886                         strlcpy (data_addr, "unknown address",
1887                                          sizeof(data_addr));
1888
1889
1890                 syslog(LOG_INFO, "connection from %s(%s)",
1891                        remotehost,
1892                        data_addr);
1893         }
1894 }
1895
1896 /*
1897  * Record logout in wtmp file
1898  * and exit with supplied status.
1899  */
1900 void
1901 dologout(int status)
1902 {
1903     transflag = 0;
1904     urgflag = 0;
1905     if (logged_in) {
1906 #if KRB4 || KRB5
1907         cond_kdestroy();
1908 #endif
1909         seteuid((uid_t)0); /* No need to check, we call exit() below */
1910         ftpd_logwtmp(ttyline, "", "");
1911     }
1912     /* beware of flushing buffers after a SIGPIPE */
1913 #ifdef XXX
1914     exit(status);
1915 #else
1916     _exit(status);
1917 #endif
1918 }
1919
1920 void abor(void)
1921 {
1922     if (!transflag)
1923         return;
1924     reply(426, "Transfer aborted. Data connection closed.");
1925     reply(226, "Abort successful");
1926     transflag = 0;
1927 }
1928
1929 static void
1930 myoob(int signo)
1931 {
1932     urgflag = 1;
1933 }
1934
1935 static char *
1936 mec_space(char *p)
1937 {
1938     while(isspace(*(unsigned char *)p))
1939           p++;
1940     return p;
1941 }
1942
1943 static int
1944 handleoobcmd(void)
1945 {
1946         char *cp;
1947
1948         /* only process if transfer occurring */
1949         if (!transflag)
1950                 return 0;
1951
1952         urgflag = 0;
1953
1954         cp = tmpline;
1955         if (ftpd_getline(cp, sizeof(tmpline)) == NULL) {
1956                 reply(221, "You could at least say goodbye.");
1957                 dologout(0);
1958         }
1959
1960         if (strncasecmp("MIC", cp, 3) == 0) {
1961             mec(mec_space(cp + 3), prot_safe);
1962         } else if (strncasecmp("CONF", cp, 4) == 0) {
1963             mec(mec_space(cp + 4), prot_confidential);
1964         } else if (strncasecmp("ENC", cp, 3) == 0) {
1965             mec(mec_space(cp + 3), prot_private);
1966         } else if (!allow_insecure_oob) {
1967             reply(533, "Command protection level denied "
1968                   "for paranoid reasons.");
1969             goto out;
1970         }
1971
1972         if (secure_command())
1973             cp = ftp_command;
1974
1975         if (strcasecmp(cp, "ABOR\r\n") == 0) {
1976                 abor();
1977         } else if (strcasecmp(cp, "STAT\r\n") == 0) {
1978                 if (file_size != (off_t) -1)
1979                         reply(213, "Status: %ld of %ld bytes transferred",
1980                               (long)byte_count,
1981                               (long)file_size);
1982                 else
1983                         reply(213, "Status: %ld bytes transferred",
1984                               (long)byte_count);
1985         }
1986 out:
1987         return (transflag == 0);
1988 }
1989
1990 /*
1991  * Note: a response of 425 is not mentioned as a possible response to
1992  *      the PASV command in RFC959. However, it has been blessed as
1993  *      a legitimate response by Jon Postel in a telephone conversation
1994  *      with Rick Adams on 25 Jan 89.
1995  */
1996 void
1997 pasv(void)
1998 {
1999         socklen_t len;
2000         char *p, *a;
2001         struct sockaddr_in *sin;
2002
2003         if (ctrl_addr->sa_family != AF_INET) {
2004                 reply(425,
2005                       "You cannot do PASV with something that's not IPv4");
2006                 return;
2007         }
2008
2009         if(pdata != -1)
2010             close(pdata);
2011
2012         pdata = socket(ctrl_addr->sa_family, SOCK_STREAM, 0);
2013         if (pdata < 0) {
2014                 perror_reply(425, "Can't open passive connection");
2015                 return;
2016         }
2017         pasv_addr->sa_family = ctrl_addr->sa_family;
2018         socket_set_address_and_port (pasv_addr,
2019                                      socket_get_address (ctrl_addr),
2020                                      0);
2021         socket_set_portrange(pdata, restricted_data_ports,
2022             pasv_addr->sa_family);
2023         if (seteuid(0) < 0)
2024                 fatal("Failed to seteuid");
2025         if (bind(pdata, pasv_addr, socket_sockaddr_size (pasv_addr)) < 0) {
2026                 if (seteuid(pw->pw_uid) < 0)
2027                         fatal("Failed to seteuid");
2028                 goto pasv_error;
2029         }
2030         if (seteuid(pw->pw_uid) < 0)
2031                 fatal("Failed to seteuid");
2032         len = sizeof(pasv_addr_ss);
2033         if (getsockname(pdata, pasv_addr, &len) < 0)
2034                 goto pasv_error;
2035         if (listen(pdata, 1) < 0)
2036                 goto pasv_error;
2037         sin = (struct sockaddr_in *)pasv_addr;
2038         a = (char *) &sin->sin_addr;
2039         p = (char *) &sin->sin_port;
2040
2041 #define UC(b) (((int) b) & 0xff)
2042
2043         reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]),
2044                 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1]));
2045         return;
2046
2047 pasv_error:
2048         close(pdata);
2049         pdata = -1;
2050         perror_reply(425, "Can't open passive connection");
2051         return;
2052 }
2053
2054 void
2055 epsv(char *proto)
2056 {
2057         socklen_t len;
2058
2059         pdata = socket(ctrl_addr->sa_family, SOCK_STREAM, 0);
2060         if (pdata < 0) {
2061                 perror_reply(425, "Can't open passive connection");
2062                 return;
2063         }
2064         pasv_addr->sa_family = ctrl_addr->sa_family;
2065         socket_set_address_and_port (pasv_addr,
2066                                      socket_get_address (ctrl_addr),
2067                                      0);
2068         socket_set_portrange(pdata, restricted_data_ports,
2069             pasv_addr->sa_family);
2070         if (seteuid(0) < 0)
2071                 fatal("Failed to seteuid");
2072         if (bind(pdata, pasv_addr, socket_sockaddr_size (pasv_addr)) < 0) {
2073                 if (seteuid(pw->pw_uid))
2074                         fatal("Failed to seteuid");
2075                 goto pasv_error;
2076         }
2077         if (seteuid(pw->pw_uid) < 0)
2078                 fatal("Failed to seteuid");
2079         len = sizeof(pasv_addr_ss);
2080         if (getsockname(pdata, pasv_addr, &len) < 0)
2081                 goto pasv_error;
2082         if (listen(pdata, 1) < 0)
2083                 goto pasv_error;
2084
2085         reply(229, "Entering Extended Passive Mode (|||%d|)",
2086               ntohs(socket_get_port (pasv_addr)));
2087         return;
2088
2089 pasv_error:
2090         close(pdata);
2091         pdata = -1;
2092         perror_reply(425, "Can't open passive connection");
2093         return;
2094 }
2095
2096 void
2097 eprt(char *str)
2098 {
2099         char *end;
2100         char sep;
2101         int af;
2102         int ret;
2103         int port;
2104
2105         usedefault = 0;
2106         if (pdata >= 0) {
2107             close(pdata);
2108             pdata = -1;
2109         }
2110
2111         sep = *str++;
2112         if (sep == '\0') {
2113                 reply(500, "Bad syntax in EPRT");
2114                 return;
2115         }
2116         af = strtol (str, &end, 0);
2117         if (af == 0 || *end != sep) {
2118                 reply(500, "Bad syntax in EPRT");
2119                 return;
2120         }
2121         str = end + 1;
2122         switch (af) {
2123 #ifdef HAVE_IPV6
2124         case 2 :
2125             data_dest->sa_family = AF_INET6;
2126             break;
2127 #endif
2128         case 1 :
2129             data_dest->sa_family = AF_INET;
2130                 break;
2131         default :
2132                 reply(522, "Network protocol %d not supported, use (1"
2133 #ifdef HAVE_IPV6
2134                       ",2"
2135 #endif
2136                       ")", af);
2137                 return;
2138         }
2139         end = strchr (str, sep);
2140         if (end == NULL) {
2141                 reply(500, "Bad syntax in EPRT");
2142                 return;
2143         }
2144         *end = '\0';
2145         ret = inet_pton (data_dest->sa_family, str,
2146                          socket_get_address (data_dest));
2147
2148         if (ret != 1) {
2149                 reply(500, "Bad address syntax in EPRT");
2150                 return;
2151         }
2152         str = end + 1;
2153         port = strtol (str, &end, 0);
2154         if (port == 0 || *end != sep) {
2155                 reply(500, "Bad port syntax in EPRT");
2156                 return;
2157         }
2158         socket_set_port (data_dest, htons(port));
2159         reply(200, "EPRT command successful.");
2160 }
2161
2162 /*
2163  * Generate unique name for file with basename "local".
2164  * The file named "local" is already known to exist.
2165  * Generates failure reply on error.
2166  */
2167 static char *
2168 gunique(char *local)
2169 {
2170         static char new[MaxPathLen];
2171         struct stat st;
2172         int count;
2173         char *cp;
2174
2175         cp = strrchr(local, '/');
2176         if (cp)
2177                 *cp = '\0';
2178         if (stat(cp ? local : ".", &st) < 0) {
2179                 perror_reply(553, cp ? local : ".");
2180                 return NULL;
2181         }
2182         if (cp)
2183                 *cp = '/';
2184         for (count = 1; count < 100; count++) {
2185                 snprintf (new, sizeof(new), "%s.%d", local, count);
2186                 if (stat(new, &st) < 0)
2187                         return (new);
2188         }
2189         reply(452, "Unique file name cannot be created.");
2190         return (NULL);
2191 }
2192
2193 /*
2194  * Format and send reply containing system error number.
2195  */
2196 void
2197 perror_reply(int code, const char *string)
2198 {
2199         reply(code, "%s: %s.", string, strerror(errno));
2200 }
2201
2202 static char *onefile[] = {
2203         "",
2204         0
2205 };
2206
2207 void
2208 list_file(char *file)
2209 {
2210     if(use_builtin_ls) {
2211         FILE *dout;
2212         dout = dataconn(file, -1, "w");
2213         if (dout == NULL)
2214             return;
2215         set_buffer_size(fileno(dout), 0);
2216         if(builtin_ls(dout, file) == 0)
2217             reply(226, "Transfer complete.");
2218         else
2219             reply(451, "Requested action aborted. Local error in processing.");
2220         fclose(dout);
2221         data = -1;
2222         pdata = -1;
2223     } else {
2224 #ifdef HAVE_LS_A
2225         const char *cmd = "/bin/ls -lA %s";
2226 #else
2227         const char *cmd = "/bin/ls -la %s";
2228 #endif
2229         retrieve(cmd, file);
2230     }
2231 }
2232
2233 void
2234 send_file_list(char *whichf)
2235 {
2236     struct stat st;
2237     DIR *dirp = NULL;
2238     struct dirent *dir;
2239     FILE *dout = NULL;
2240     char **dirlist, *dirname;
2241     int simple = 0;
2242     int freeglob = 0;
2243     glob_t gl;
2244     char buf[MaxPathLen];
2245
2246     if (strpbrk(whichf, "~{[*?") != NULL) {
2247         int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE|
2248 #ifdef GLOB_MAXPATH
2249             GLOB_MAXPATH
2250 #else
2251             GLOB_LIMIT
2252 #endif
2253             ;
2254
2255         memset(&gl, 0, sizeof(gl));
2256         freeglob = 1;
2257         if (glob(whichf, flags, 0, &gl)) {
2258             reply(550, "not found");
2259             goto out;
2260         } else if (gl.gl_pathc == 0) {
2261             errno = ENOENT;
2262             perror_reply(550, whichf);
2263             goto out;
2264         }
2265         dirlist = gl.gl_pathv;
2266     } else {
2267         onefile[0] = whichf;
2268         dirlist = onefile;
2269         simple = 1;
2270     }
2271
2272     while ((dirname = *dirlist++)) {
2273
2274         if (urgflag && handleoobcmd())
2275             goto out;
2276
2277         if (stat(dirname, &st) < 0) {
2278             /*
2279              * If user typed "ls -l", etc, and the client
2280              * used NLST, do what the user meant.
2281              */
2282             if (dirname[0] == '-' && *dirlist == NULL &&
2283                 transflag == 0) {
2284                 list_file(dirname);
2285                 goto out;
2286             }
2287             perror_reply(550, whichf);
2288             goto out;
2289         }
2290
2291         if (S_ISREG(st.st_mode)) {
2292             if (dout == NULL) {
2293                 dout = dataconn("file list", (off_t)-1, "w");
2294                 if (dout == NULL)
2295                     goto out;
2296                 transflag = 1;
2297             }
2298             snprintf(buf, sizeof(buf), "%s%s\n", dirname,
2299                      type == TYPE_A ? "\r" : "");
2300             sec_write(fileno(dout), buf, strlen(buf));
2301             byte_count += strlen(dirname) + 1;
2302             continue;
2303         } else if (!S_ISDIR(st.st_mode))
2304             continue;
2305
2306         if ((dirp = opendir(dirname)) == NULL)
2307             continue;
2308
2309         while ((dir = readdir(dirp)) != NULL) {
2310             char nbuf[MaxPathLen];
2311
2312             if (urgflag && handleoobcmd())
2313                 goto out;
2314
2315             if (!strcmp(dir->d_name, "."))
2316                 continue;
2317             if (!strcmp(dir->d_name, ".."))
2318                 continue;
2319
2320             snprintf(nbuf, sizeof(nbuf), "%s/%s", dirname, dir->d_name);
2321
2322             /*
2323              * We have to do a stat to insure it's
2324              * not a directory or special file.
2325              */
2326             if (simple || (stat(nbuf, &st) == 0 &&
2327                            S_ISREG(st.st_mode))) {
2328                 if (dout == NULL) {
2329                     dout = dataconn("file list", (off_t)-1, "w");
2330                     if (dout == NULL)
2331                         goto out;
2332                     transflag = 1;
2333                 }
2334                 if(strncmp(nbuf, "./", 2) == 0)
2335                     snprintf(buf, sizeof(buf), "%s%s\n", nbuf +2,
2336                              type == TYPE_A ? "\r" : "");
2337                 else
2338                     snprintf(buf, sizeof(buf), "%s%s\n", nbuf,
2339                              type == TYPE_A ? "\r" : "");
2340                 sec_write(fileno(dout), buf, strlen(buf));
2341                 byte_count += strlen(nbuf) + 1;
2342             }
2343         }
2344         closedir(dirp);
2345     }
2346     if (dout == NULL)
2347         reply(550, "No files found.");
2348     else if (ferror(dout) != 0)
2349         perror_reply(550, "Data connection");
2350     else
2351         reply(226, "Transfer complete.");
2352
2353 out:
2354     transflag = 0;
2355     if (dout != NULL){
2356         sec_write(fileno(dout), buf, 0); /* XXX flush */
2357
2358         fclose(dout);
2359     }
2360     data = -1;
2361     pdata = -1;
2362     if (freeglob) {
2363         freeglob = 0;
2364         globfree(&gl);
2365     }
2366 }
2367
2368
2369 int
2370 find(char *pattern)
2371 {
2372     char line[1024];
2373     FILE *f;
2374
2375     snprintf(line, sizeof(line),
2376              "/bin/locate -d %s -- %s",
2377              ftp_rooted("/etc/locatedb"),
2378              pattern);
2379     f = ftpd_popen(line, "r", 1, 1);
2380     if(f == NULL){
2381         perror_reply(550, "/bin/locate");
2382         return 1;
2383     }
2384     lreply(200, "Output from find.");
2385     while(fgets(line, sizeof(line), f)){
2386         if(line[strlen(line)-1] == '\n')
2387             line[strlen(line)-1] = 0;
2388         nreply("%s", line);
2389     }
2390     reply(200, "Done");
2391     ftpd_pclose(f);
2392     return 0;
2393 }
2394