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("$Id$");
  42
  43 static char version[] = "Version 6.00";
  44
  45 extern  off_t restart_point;
  46 extern  char cbuf[];
  47
  48 struct  sockaddr_storage ctrl_addr_ss;
  49 struct  sockaddr *ctrl_addr = (struct sockaddr *)&ctrl_addr_ss;
  50
  51 struct  sockaddr_storage data_source_ss;
  52 struct  sockaddr *data_source = (struct sockaddr *)&data_source_ss;
  53
  54 struct  sockaddr_storage data_dest_ss;
  55 struct  sockaddr *data_dest = (struct sockaddr *)&data_dest_ss;
  56
  57 struct  sockaddr_storage his_addr_ss;
  58 struct  sockaddr *his_addr = (struct sockaddr *)&his_addr_ss;
  59
  60 struct  sockaddr_storage pasv_addr_ss;
  61 struct  sockaddr *pasv_addr = (struct sockaddr *)&pasv_addr_ss;
  62
  63 int     data;
  64 int     logged_in;
  65 struct  passwd *pw;
  66 int     debug = 0;
  67 int     ftpd_timeout = 900;    /* timeout after 15 minutes of inactivity */
  68 int     maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */
  69 int     restricted_data_ports = 1;
  70 int     logging;
  71 int     guest;
  72 int     dochroot;
  73 int     type;
  74 int     form;
  75 int     stru;                   /* avoid C keyword */
  76 int     mode;
  77 int     usedefault = 1;         /* for data transfers */
  78 int     pdata = -1;             /* for passive mode */
  79 int     allow_insecure_oob = 1;
  80 static int transflag;
  81 static int urgflag;
  82 off_t   file_size;
  83 off_t   byte_count;
  84 #if !defined(CMASK) || CMASK == 0
  85 #undef CMASK
  86 #define CMASK 027
  87 #endif
  88 int     defumask = CMASK;               /* default umask value */
  89 int     guest_umask = 0777;     /* Paranoia for anonymous users */
  90 char    tmpline[10240];
  91 char    hostname[MaxHostNameLen];
  92 char    remotehost[MaxHostNameLen];
  93 static char ttyline[20];
  94 int     paranoid = 1;
  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     if(getarg(args, num_args, argc, argv, &optind))
 276         usage(1);
 277
 278     if(help_flag)
 279         usage(0);
 280
 281     if(version_flag) {
 282         print_version(NULL);
 283         exit(0);
 284     }
 285
 286     if(auth_string)
 287         auth_level = parse_auth_level(auth_string);
 288     {
 289         char *p;
 290         long val = 0;
 291
 292         if(guest_umask_string) {
 293             val = strtol(guest_umask_string, &p, 8);
 294             if (*p != '\0' || val < 0)
 295                 warnx("bad value for -g");
 296             else
 297                 guest_umask = val;
 298         }
 299         if(umask_string) {
 300             val = strtol(umask_string, &p, 8);
 301             if (*p != '\0' || val < 0)
 302                 warnx("bad value for -u");
 303             else
 304                 defumask = val;
 305         }
 306     }
 307     sp = getservbyname("ftp", "tcp");
 308     if(sp)
 309         port = sp->s_port;
 310     else
 311         port = htons(21);
 312     if(port_string) {
 313         sp = getservbyname(port_string, "tcp");
 314         if(sp)
 315             port = sp->s_port;
 316         else
 317             if(isdigit((unsigned char)port_string[0]))
 318                 port = htons(atoi(port_string));
 319             else
 320                 warnx("bad value for -p");
 321     }
 322
 323     if (maxtimeout < ftpd_timeout)
 324         maxtimeout = ftpd_timeout;
 325
 326 #if 0
 327     if (ftpd_timeout > maxtimeout)
 328         ftpd_timeout = maxtimeout;
 329 #endif
 330
 331     if(interactive_flag)
 332         mini_inetd(port, NULL);
 333
 334     /*
 335      * LOG_NDELAY sets up the logging connection immediately,
 336      * necessary for anonymous ftp's that chroot and can't do it later.
 337      */
 338     openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP);
 339     his_addr_len = sizeof(his_addr_ss);
 340     if (getpeername(STDIN_FILENO, his_addr, &his_addr_len) < 0) {
 341         syslog(LOG_ERR, "getpeername (%s): %m",argv[0]);
 342         exit(1);
 343     }
 344     ctrl_addr_len = sizeof(ctrl_addr_ss);
 345     if (getsockname(STDIN_FILENO, ctrl_addr, &ctrl_addr_len) < 0) {
 346         syslog(LOG_ERR, "getsockname (%s): %m",argv[0]);
 347         exit(1);
 348     }
 349 #if defined(IP_TOS) && defined(HAVE_SETSOCKOPT)
 350     {
 351         int tos = IPTOS_LOWDELAY;
 352
 353         if (setsockopt(STDIN_FILENO, IPPROTO_IP, IP_TOS,
 354                        (void *)&tos, sizeof(int)) < 0)
 355             syslog(LOG_WARNING, "setsockopt (IP_TOS): %m");
 356     }
 357 #endif
 358     data_source->sa_family = ctrl_addr->sa_family;
 359     socket_set_port (data_source,
 360                      htons(ntohs(socket_get_port(ctrl_addr)) - 1));
 361
 362     /* set this here so it can be put in wtmp */
 363     snprintf(ttyline, sizeof(ttyline), "ftp%u", (unsigned)getpid());
 364
 365
 366     /*  freopen(_PATH_DEVNULL, "w", stderr); */
 367     signal(SIGPIPE, lostconn);
 368     signal(SIGCHLD, SIG_IGN);
 369 #ifdef SIGURG
 370     if (signal(SIGURG, myoob) == SIG_ERR)
 371         syslog(LOG_ERR, "signal: %m");
 372 #endif
 373
 374     /* Try to handle urgent data inline */
 375 #if defined(SO_OOBINLINE) && defined(HAVE_SETSOCKOPT)
 376     if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (void *)&on,
 377                    sizeof(on)) < 0)
 378         syslog(LOG_ERR, "setsockopt: %m");
 379 #endif
 380
 381 #ifdef  F_SETOWN
 382     if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1)
 383         syslog(LOG_ERR, "fcntl F_SETOWN: %m");
 384 #endif
 385     dolog(his_addr, his_addr_len);
 386     /*
 387      * Set up default state
 388      */
 389     data = -1;
 390     type = TYPE_A;
 391     form = FORM_N;
 392     stru = STRU_F;
 393     mode = MODE_S;
 394     tmpline[0] = '\0';
 395
 396     /* If logins are disabled, print out the message. */
 397     if(show_file(_PATH_NOLOGIN, 530) == 0) {
 398         reply(530, "System not available.");
 399         exit(0);
 400     }
 401     show_file(_PATH_FTPWELCOME, 220);
 402     /* reply(220,) must follow */
 403     gethostname(hostname, sizeof(hostname));
 404
 405     reply(220, "%s FTP server (%s"
 406 #ifdef KRB5
 407           "+%s"
 408 #endif
 409           ") ready.", hostname, version
 410 #ifdef KRB5
 411           ,heimdal_version
 412 #endif
 413           );
 414
 415     for (;;)
 416         yyparse();
 417     /* NOTREACHED */
 418 }
 419
 420 static RETSIGTYPE
 421 lostconn(int signo)
 422 {
 423
 424         if (debug)
 425                 syslog(LOG_DEBUG, "lost connection");
 426         dologout(-1);
 427 }
 428
 429 /*
 430  * Helper function for sgetpwnam().
 431  */
 432 static char *
 433 sgetsave(char *s)
 434 {
 435         char *new = strdup(s);
 436
 437         if (new == NULL) {
 438                 perror_reply(421, "Local resource failure: malloc");
 439                 dologout(1);
 440                 /* NOTREACHED */
 441         }
 442         return new;
 443 }
 444
 445 /*
 446  * Save the result of a getpwnam.  Used for USER command, since
 447  * the data returned must not be clobbered by any other command
 448  * (e.g., globbing).
 449  */
 450 static struct passwd *
 451 sgetpwnam(char *name)
 452 {
 453         static struct passwd save;
 454         struct passwd *p;
 455
 456         if ((p = k_getpwnam(name)) == NULL)
 457                 return (p);
 458         if (save.pw_name) {
 459                 free(save.pw_name);
 460                 free(save.pw_passwd);
 461                 free(save.pw_gecos);
 462                 free(save.pw_dir);
 463                 free(save.pw_shell);
 464         }
 465         save = *p;
 466         save.pw_name = sgetsave(p->pw_name);
 467         save.pw_passwd = sgetsave(p->pw_passwd);
 468         save.pw_gecos = sgetsave(p->pw_gecos);
 469         save.pw_dir = sgetsave(p->pw_dir);
 470         save.pw_shell = sgetsave(p->pw_shell);
 471         return (&save);
 472 }
 473
 474 static int login_attempts;      /* number of failed login attempts */
 475 static int askpasswd;           /* had user command, ask for passwd */
 476 static char curname[10];        /* current USER name */
 477 #ifdef OTP
 478 OtpContext otp_ctx;
 479 #endif
 480
 481 /*
 482  * USER command.
 483  * Sets global passwd pointer pw if named account exists and is acceptable;
 484  * sets askpasswd if a PASS command is expected.  If logged in previously,
 485  * need to reset state.  If name is "ftp" or "anonymous", the name is not in
 486  * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return.
 487  * If account doesn't exist, ask for passwd anyway.  Otherwise, check user
 488  * requesting login privileges.  Disallow anyone who does not have a standard
 489  * shell as returned by getusershell().  Disallow anyone mentioned in the file
 490  * _PATH_FTPUSERS to allow people such as root and uucp to be avoided.
 491  */
 492 void
 493 user(char *name)
 494 {
 495         char *cp, *shell;
 496
 497         if(auth_level == 0 && !sec_complete){
 498             reply(530, "No login allowed without authorization.");
 499             return;
 500         }
 501
 502         if (logged_in) {
 503                 if (guest) {
 504                         reply(530, "Can't change user from guest login.");
 505                         return;
 506                 } else if (dochroot) {
 507                         reply(530, "Can't change user from chroot user.");
 508                         return;
 509                 }
 510                 end_login();
 511         }
 512
 513         guest = 0;
 514         if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) {
 515             if ((auth_level & AUTH_FTP) == 0 ||
 516                 checkaccess("ftp") ||
 517                 checkaccess("anonymous"))
 518                 reply(530, "User %s access denied.", name);
 519             else if ((pw = sgetpwnam("ftp")) != NULL) {
 520                 guest = 1;
 521                 defumask = guest_umask; /* paranoia for incoming */
 522                 askpasswd = 1;
 523                 reply(331, "Guest login ok, type your name as password.");
 524             } else
 525                 reply(530, "User %s unknown.", name);
 526             if (!askpasswd && logging) {
 527                 char data_addr[256];
 528
 529                 if (inet_ntop (his_addr->sa_family,
 530                                socket_get_address(his_addr),
 531                                data_addr, sizeof(data_addr)) == NULL)
 532                         strlcpy (data_addr, "unknown address",
 533                                          sizeof(data_addr));
 534
 535                 syslog(LOG_NOTICE,
 536                        "ANONYMOUS FTP LOGIN REFUSED FROM %s(%s)",
 537                        remotehost, data_addr);
 538             }
 539             return;
 540         }
 541         if((auth_level & AUTH_PLAIN) == 0 && !sec_complete){
 542             reply(530, "Only authorized and anonymous login allowed.");
 543             return;
 544         }
 545         if ((pw = sgetpwnam(name))) {
 546                 if ((shell = pw->pw_shell) == NULL || *shell == 0)
 547                         shell = _PATH_BSHELL;
 548                 while ((cp = getusershell()) != NULL)
 549                         if (strcmp(cp, shell) == 0)
 550                                 break;
 551                 endusershell();
 552
 553                 if (cp == NULL || checkaccess(name)) {
 554                         reply(530, "User %s access denied.", name);
 555                         if (logging) {
 556                                 char data_addr[256];
 557
 558                                 if (inet_ntop (his_addr->sa_family,
 559                                                socket_get_address(his_addr),
 560                                                data_addr,
 561                                                sizeof(data_addr)) == NULL)
 562                                         strlcpy (data_addr,
 563                                                          "unknown address",
 564                                                          sizeof(data_addr));
 565
 566                                 syslog(LOG_NOTICE,
 567                                        "FTP LOGIN REFUSED FROM %s(%s), %s",
 568                                        remotehost,
 569                                        data_addr,
 570                                        name);
 571                         }
 572                         pw = (struct passwd *) NULL;
 573                         return;
 574                 }
 575         }
 576         if (logging)
 577             strlcpy(curname, name, sizeof(curname));
 578         if(sec_complete) {
 579             if(sec_userok(name) == 0) {
 580                 do_login(232, name);
 581                 sec_session(name);
 582             } else
 583                 reply(530, "User %s access denied.", name);
 584         } else {
 585 #ifdef OTP
 586                 char ss[256];
 587
 588                 if (otp_challenge(&otp_ctx, name, ss, sizeof(ss)) == 0) {
 589                         reply(331, "Password %s for %s required.",
 590                               ss, name);
 591                         askpasswd = 1;
 592                 } else
 593 #endif
 594                 if ((auth_level & AUTH_OTP) == 0) {
 595                     reply(331, "Password required for %s.", name);
 596                     askpasswd = 1;
 597                 } else {
 598 #ifdef OTP
 599                     char *s;
 600
 601                     if ((s = otp_error (&otp_ctx)) != NULL)
 602                         lreply(530, "OTP: %s", s);
 603 #endif
 604                     reply(530,
 605                           "Only authorized, anonymous"
 606 #ifdef OTP
 607                           " and OTP "
 608 #endif
 609                           "login allowed.");
 610                 }
 611
 612         }
 613         /*
 614          * Delay before reading passwd after first failed
 615          * attempt to slow down passwd-guessing programs.
 616          */
 617         if (login_attempts)
 618                 sleep(login_attempts);
 619 }
 620
 621 /*
 622  * Check if a user is in the file "fname"
 623  */
 624 static int
 625 checkuser(char *fname, char *name)
 626 {
 627         FILE *fd;
 628         int found = 0;
 629         char *p, line[BUFSIZ];
 630
 631         if ((fd = fopen(fname, "r")) != NULL) {
 632                 while (fgets(line, sizeof(line), fd) != NULL)
 633                         if ((p = strchr(line, '\n')) != NULL) {
 634                                 *p = '\0';
 635                                 if (line[0] == '#')
 636                                         continue;
 637                                 if (strcmp(line, name) == 0) {
 638                                         found = 1;
 639                                         break;
 640                                 }
 641                         }
 642                 fclose(fd);
 643         }
 644         return (found);
 645 }
 646
 647
 648 /*
 649  * Determine whether a user has access, based on information in
 650  * _PATH_FTPUSERS. The users are listed one per line, with `allow'
 651  * or `deny' after the username. If anything other than `allow', or
 652  * just nothing, is given after the username, `deny' is assumed.
 653  *
 654  * If the user is not found in the file, but the pseudo-user `*' is,
 655  * the permission is taken from that line.
 656  *
 657  * This preserves the old semantics where if a user was listed in the
 658  * file he was denied, otherwise he was allowed.
 659  *
 660  * Return 1 if the user is denied, or 0 if he is allowed.  */
 661
 662 static int
 663 match(const char *pattern, const char *string)
 664 {
 665     return fnmatch(pattern, string, FNM_NOESCAPE);
 666 }
 667
 668 static int
 669 checkaccess(char *name)
 670 {
 671 #define ALLOWED         0
 672 #define NOT_ALLOWED     1
 673     FILE *fd;
 674     int allowed = ALLOWED;
 675     char *user, *perm, line[BUFSIZ];
 676     char *foo;
 677
 678     fd = fopen(_PATH_FTPUSERS, "r");
 679
 680     if(fd == NULL)
 681         return allowed;
 682
 683     while (fgets(line, sizeof(line), fd) != NULL)  {
 684         foo = NULL;
 685         user = strtok_r(line, " \t\n", &foo);
 686         if (user == NULL || user[0] == '#')
 687             continue;
 688         perm = strtok_r(NULL, " \t\n", &foo);
 689         if (match(user, name) == 0){
 690             if(perm && strcmp(perm, "allow") == 0)
 691                 allowed = ALLOWED;
 692             else
 693                 allowed = NOT_ALLOWED;
 694             break;
 695         }
 696     }
 697     fclose(fd);
 698     return allowed;
 699 }
 700 #undef  ALLOWED
 701 #undef  NOT_ALLOWED
 702
 703
 704 int do_login(int code, char *passwd)
 705 {
 706     login_attempts = 0;         /* this time successful */
 707     if (setegid((gid_t)pw->pw_gid) < 0) {
 708         reply(550, "Can't set gid.");
 709         return -1;
 710     }
 711     initgroups(pw->pw_name, pw->pw_gid);
 712 #if defined(KRB5)
 713     if(k_hasafs())
 714         k_setpag();
 715 #endif
 716
 717     /* open wtmp before chroot */
 718     ftpd_logwtmp(ttyline, pw->pw_name, remotehost);
 719     logged_in = 1;
 720
 721     dochroot = checkuser(_PATH_FTPCHROOT, pw->pw_name);
 722     if (guest) {
 723         /*
 724          * We MUST do a chdir() after the chroot. Otherwise
 725          * the old current directory will be accessible as "."
 726          * outside the new root!
 727          */
 728         if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) {
 729             reply(550, "Can't set guest privileges.");
 730             return -1;
 731         }
 732     } else if (dochroot) {
 733         if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) {
 734             reply(550, "Can't change root.");
 735             return -1;
 736         }
 737     } else if (chdir(pw->pw_dir) < 0) {
 738         if (chdir("/") < 0) {
 739             reply(530, "User %s: can't change directory to %s.",
 740                   pw->pw_name, pw->pw_dir);
 741             return -1;
 742         } else
 743             lreply(code, "No directory! Logging in with home=/");
 744     }
 745     if (seteuid((uid_t)pw->pw_uid) < 0) {
 746         reply(550, "Can't set uid.");
 747         return -1;
 748     }
 749
 750     if(use_builtin_ls == -1) {
 751         struct stat st;
 752         /* if /bin/ls exist and is a regular file, use it, otherwise
 753            use built-in ls */
 754         if(stat("/bin/ls", &st) == 0 &&
 755            S_ISREG(st.st_mode))
 756             use_builtin_ls = 0;
 757         else
 758             use_builtin_ls = 1;
 759     }
 760
 761     /*
 762      * Display a login message, if it exists.
 763      * N.B. reply(code,) must follow the message.
 764      */
 765     show_file(_PATH_FTPLOGINMESG, code);
 766     if(show_file(_PATH_ISSUE_NET, code) != 0)
 767         show_file(_PATH_ISSUE, code);
 768     if (guest) {
 769         reply(code, "Guest login ok, access restrictions apply.");
 770 #ifdef HAVE_SETPROCTITLE
 771         snprintf (proctitle, sizeof(proctitle),
 772                   "%s: anonymous/%s",
 773                   remotehost,
 774                   passwd);
 775         setproctitle("%s", proctitle);
 776 #endif /* HAVE_SETPROCTITLE */
 777         if (logging) {
 778             char data_addr[256];
 779
 780             if (inet_ntop (his_addr->sa_family,
 781                            socket_get_address(his_addr),
 782                            data_addr, sizeof(data_addr)) == NULL)
 783                 strlcpy (data_addr, "unknown address",
 784                                  sizeof(data_addr));
 785
 786             syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s(%s), %s",
 787                    remotehost,
 788                    data_addr,
 789                    passwd);
 790         }
 791     } else {
 792         reply(code, "User %s logged in.", pw->pw_name);
 793 #ifdef HAVE_SETPROCTITLE
 794         snprintf(proctitle, sizeof(proctitle), "%s: %s", remotehost, pw->pw_name);
 795         setproctitle("%s", proctitle);
 796 #endif /* HAVE_SETPROCTITLE */
 797         if (logging) {
 798             char data_addr[256];
 799
 800             if (inet_ntop (his_addr->sa_family,
 801                            socket_get_address(his_addr),
 802                            data_addr, sizeof(data_addr)) == NULL)
 803                 strlcpy (data_addr, "unknown address",
 804                                  sizeof(data_addr));
 805
 806             syslog(LOG_INFO, "FTP LOGIN FROM %s(%s) as %s",
 807                    remotehost,
 808                    data_addr,
 809                    pw->pw_name);
 810         }
 811     }
 812     umask(defumask);
 813     return 0;
 814 }
 815
 816 /*
 817  * Terminate login as previous user, if any, resetting state;
 818  * used when USER command is given or login fails.
 819  */
 820 static void
 821 end_login(void)
 822 {
 823
 824         if (seteuid((uid_t)0) < 0)
 825                 fatal("Failed to seteuid");
 826         if (logged_in)
 827                 ftpd_logwtmp(ttyline, "", "");
 828         pw = NULL;
 829         logged_in = 0;
 830         guest = 0;
 831         dochroot = 0;
 832 }
 833
 834 #ifdef KRB5
 835 static int
 836 krb5_verify(struct passwd *pwd, char *passwd)
 837 {
 838    krb5_context context;
 839    krb5_ccache  id;
 840    krb5_principal princ;
 841    krb5_error_code ret;
 842
 843    ret = krb5_init_context(&context);
 844    if(ret)
 845         return ret;
 846
 847   ret = krb5_parse_name(context, pwd->pw_name, &princ);
 848   if(ret){
 849         krb5_free_context(context);
 850         return ret;
 851   }
 852   ret = krb5_cc_new_unique(context, "MEMORY", NULL, &id);
 853   if(ret){
 854         krb5_free_principal(context, princ);
 855         krb5_free_context(context);
 856         return ret;
 857   }
 858   ret = krb5_verify_user(context,
 859                          princ,
 860                          id,
 861                          passwd,
 862                          1,
 863                          NULL);
 864   krb5_free_principal(context, princ);
 865   if (k_hasafs()) {
 866       krb5_afslog_uid_home(context, id,NULL, NULL,pwd->pw_uid, pwd->pw_dir);
 867   }
 868   krb5_cc_destroy(context, id);
 869   krb5_free_context (context);
 870   if(ret)
 871       return ret;
 872   return 0;
 873 }
 874 #endif /* KRB5 */
 875
 876 void
 877 pass(char *passwd)
 878 {
 879         int rval;
 880
 881         /* some clients insists on sending a password */
 882         if (logged_in && askpasswd == 0){
 883             reply(230, "Password not necessary");
 884             return;
 885         }
 886
 887         if (logged_in || askpasswd == 0) {
 888                 reply(503, "Login with USER first.");
 889                 return;
 890         }
 891         askpasswd = 0;
 892         rval = 1;
 893         if (!guest) {           /* "ftp" is only account allowed no password */
 894                 if (pw == NULL)
 895                         rval = 1;       /* failure below */
 896 #ifdef OTP
 897                 else if (otp_verify_user (&otp_ctx, passwd) == 0) {
 898                     rval = 0;
 899                 }
 900 #endif
 901                 else if((auth_level & AUTH_OTP) == 0) {
 902 #ifdef KRB5
 903                     rval = krb5_verify(pw, passwd);
 904 #endif
 905                     if (rval)
 906                         rval = unix_verify_user(pw->pw_name, passwd);
 907                 } else {
 908 #ifdef OTP
 909                     char *s;
 910                     if ((s = otp_error(&otp_ctx)) != NULL)
 911                         lreply(530, "OTP: %s", s);
 912 #endif
 913                 }
 914                 memset (passwd, 0, strlen(passwd));
 915
 916                 /*
 917                  * If rval == 1, the user failed the authentication
 918                  * check above.  If rval == 0, either Kerberos or
 919                  * local authentication succeeded.
 920                  */
 921                 if (rval) {
 922                         char data_addr[256];
 923
 924                         if (inet_ntop (his_addr->sa_family,
 925                                        socket_get_address(his_addr),
 926                                        data_addr, sizeof(data_addr)) == NULL)
 927                                 strlcpy (data_addr, "unknown address",
 928                                                  sizeof(data_addr));
 929
 930                         reply(530, "Login incorrect.");
 931                         if (logging)
 932                                 syslog(LOG_NOTICE,
 933                                     "FTP LOGIN FAILED FROM %s(%s), %s",
 934                                        remotehost,
 935                                        data_addr,
 936                                        curname);
 937                         pw = NULL;
 938                         if (login_attempts++ >= 5) {
 939                                 syslog(LOG_NOTICE,
 940                                        "repeated login failures from %s(%s)",
 941                                        remotehost,
 942                                        data_addr);
 943                                 exit(0);
 944                         }
 945                         return;
 946                 }
 947         }
 948         if(!do_login(230, passwd))
 949           return;
 950
 951         /* Forget all about it... */
 952         end_login();
 953 }
 954
 955 void
 956 retrieve(const char *cmd, char *name)
 957 {
 958         FILE *fin = NULL, *dout;
 959         struct stat st;
 960         int (*closefunc) (FILE *);
 961         char line[BUFSIZ];
 962
 963
 964         if (cmd == 0) {
 965                 fin = fopen(name, "r");
 966                 closefunc = fclose;
 967                 st.st_size = 0;
 968                 if(fin == NULL){
 969                     int save_errno = errno;
 970                     struct cmds {
 971                         const char *ext;
 972                         const char *cmd;
 973                         const char *rev_cmd;
 974                     } cmds[] = {
 975                         {".tar", "/bin/gtar cPf - %s", NULL},
 976                         {".tar.gz", "/bin/gtar zcPf - %s", NULL},
 977                         {".tar.Z", "/bin/gtar ZcPf - %s", NULL},
 978                         {".gz", "/bin/gzip -c -- %s", "/bin/gzip -c -d -- %s"},
 979                         {".Z", "/bin/compress -c -- %s", "/bin/uncompress -c -- %s"},
 980                         {NULL, NULL}
 981                     };
 982                     struct cmds *p;
 983                     for(p = cmds; p->ext; p++){
 984                         char *tail = name + strlen(name) - strlen(p->ext);
 985                         char c = *tail;
 986
 987                         if(strcmp(tail, p->ext) == 0 &&
 988                            (*tail  = 0) == 0 &&
 989                            access(name, R_OK) == 0){
 990                             snprintf (line, sizeof(line), p->cmd, name);
 991                             *tail  = c;
 992                             break;
 993                         }
 994                         *tail = c;
 995                         if (p->rev_cmd != NULL) {
 996                             char *ext;
 997                             int ret;
 998
 999                             ret = asprintf(&ext, "%s%s", name, p->ext);
1000                             if (ret != -1) {
1001                                 if (access(ext, R_OK) == 0) {
1002                                     snprintf (line, sizeof(line),
1003                                               p->rev_cmd, ext);
1004                                     free(ext);
1005                                     break;
1006                                 }
1007                                 free(ext);
1008                             }
1009                         }
1010
1011                     }
1012                     if(p->ext){
1013                         fin = ftpd_popen(line, "r", 0, 0);
1014                         closefunc = ftpd_pclose;
1015                         st.st_size = -1;
1016                         cmd = line;
1017                     } else
1018                         errno = save_errno;
1019                 }
1020         } else {
1021                 snprintf(line, sizeof(line), cmd, name);
1022                 name = line;
1023                 fin = ftpd_popen(line, "r", 1, 0);
1024                 closefunc = ftpd_pclose;
1025                 st.st_size = -1;
1026         }
1027         if (fin == NULL) {
1028                 if (errno != 0) {
1029                         perror_reply(550, name);
1030                         if (cmd == 0) {
1031                                 LOGCMD("get", name);
1032                         }
1033                 }
1034                 return;
1035         }
1036         byte_count = -1;
1037         if (cmd == 0){
1038             if(fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode)) {
1039                 reply(550, "%s: not a plain file.", name);
1040                 goto done;
1041             }
1042         }
1043         if (restart_point) {
1044                 if (type == TYPE_A) {
1045                         off_t i, n;
1046                         int c;
1047
1048                         n = restart_point;
1049                         i = 0;
1050                         while (i++ < n) {
1051                                 if ((c=getc(fin)) == EOF) {
1052                                         perror_reply(550, name);
1053                                         goto done;
1054                                 }
1055                                 if (c == '\n')
1056                                         i++;
1057                         }
1058                 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) {
1059                         perror_reply(550, name);
1060                         goto done;
1061                 }
1062         }
1063         dout = dataconn(name, st.st_size, "w");
1064         if (dout == NULL)
1065                 goto done;
1066         set_buffer_size(fileno(dout), 0);
1067         send_data(fin, dout);
1068         fclose(dout);
1069         data = -1;
1070         pdata = -1;
1071 done:
1072         if (cmd == 0)
1073                 LOGBYTES("get", name, byte_count);
1074         (*closefunc)(fin);
1075 }
1076
1077 /* filename sanity check */
1078
1079 int
1080 filename_check(char *filename)
1081 {
1082     char *p;
1083
1084     p = strrchr(filename, '/');
1085     if(p)
1086         filename = p + 1;
1087
1088     p = filename;
1089
1090     if(isalnum((unsigned char)*p)){
1091         p++;
1092         while(*p && (isalnum((unsigned char)*p) || strchr(good_chars, (unsigned char)*p)))
1093             p++;
1094         if(*p == '\0')
1095             return 0;
1096     }
1097     lreply(553, "\"%s\" is not an acceptable filename.", filename);
1098     lreply(553, "The filename must start with an alphanumeric "
1099            "character and must only");
1100     reply(553, "consist of alphanumeric characters or any of the following: %s",
1101           good_chars);
1102     return 1;
1103 }
1104
1105 void
1106 do_store(char *name, char *mode, int unique)
1107 {
1108         FILE *fout, *din;
1109         struct stat st;
1110         int (*closefunc) (FILE *);
1111
1112         if(guest && filename_check(name))
1113             return;
1114         if (unique) {
1115             char *uname;
1116             if (stat(name, &st) == 0) {
1117                 if ((uname = gunique(name)) == NULL)
1118                     return;
1119                 name = uname;
1120             }
1121             LOGCMD(*mode == 'w' ? "put" : "append", name);
1122         }
1123
1124         if (restart_point)
1125                 mode = "r+";
1126         fout = fopen(name, mode);
1127         closefunc = fclose;
1128         if (fout == NULL) {
1129                 perror_reply(553, name);
1130                 LOGCMD(*mode == 'w' ? "put" : "append", name);
1131                 return;
1132         }
1133         byte_count = -1;
1134         if (restart_point) {
1135                 if (type == TYPE_A) {
1136                         off_t i, n;
1137                         int c;
1138
1139                         n = restart_point;
1140                         i = 0;
1141                         while (i++ < n) {
1142                                 if ((c=getc(fout)) == EOF) {
1143                                         perror_reply(550, name);
1144                                         goto done;
1145                                 }
1146                                 if (c == '\n')
1147                                         i++;
1148                         }
1149                         /*
1150                          * We must do this seek to "current" position
1151                          * because we are changing from reading to
1152                          * writing.
1153                          */
1154                         if (fseek(fout, 0L, SEEK_CUR) < 0) {
1155                                 perror_reply(550, name);
1156                                 goto done;
1157                         }
1158                 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) {
1159                         perror_reply(550, name);
1160                         goto done;
1161                 }
1162         }
1163         din = dataconn(name, (off_t)-1, "r");
1164         if (din == NULL)
1165                 goto done;
1166         set_buffer_size(fileno(din), 1);
1167         if (receive_data(din, fout) == 0) {
1168             if((*closefunc)(fout) < 0)
1169                 perror_reply(552, name);
1170             else {
1171                 if (unique)
1172                         reply(226, "Transfer complete (unique file name:%s).",
1173                             name);
1174                 else
1175                         reply(226, "Transfer complete.");
1176             }
1177         } else
1178             (*closefunc)(fout);
1179         fclose(din);
1180         data = -1;
1181         pdata = -1;
1182 done:
1183         LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count);
1184 }
1185
1186 static FILE *
1187 getdatasock(const char *mode, int domain)
1188 {
1189         int s, t, tries;
1190
1191         if (data >= 0)
1192                 return (fdopen(data, mode));
1193         if (seteuid(0) < 0)
1194                 fatal("Failed to seteuid");
1195         s = socket(domain, SOCK_STREAM, 0);
1196         if (s < 0)
1197                 goto bad;
1198         socket_set_reuseaddr (s, 1);
1199         /* anchor socket to avoid multi-homing problems */
1200         socket_set_address_and_port (data_source,
1201                                      socket_get_address (ctrl_addr),
1202                                      socket_get_port (data_source));
1203
1204         for (tries = 1; ; tries++) {
1205                 if (bind(s, data_source,
1206                          socket_sockaddr_size (data_source)) >= 0)
1207                         break;
1208                 if (errno != EADDRINUSE || tries > 10)
1209                         goto bad;
1210                 sleep(tries);
1211         }
1212         if (seteuid(pw->pw_uid) < 0)
1213                 fatal("Failed to seteuid");
1214 #ifdef IPTOS_THROUGHPUT
1215         socket_set_tos (s, IPTOS_THROUGHPUT);
1216 #endif
1217         return (fdopen(s, mode));
1218 bad:
1219         /* Return the real value of errno (close may change it) */
1220         t = errno;
1221         if (seteuid((uid_t)pw->pw_uid) < 0)
1222                 fatal("Failed to seteuid");
1223         close(s);
1224         errno = t;
1225         return (NULL);
1226 }
1227
1228 static int
1229 accept_with_timeout(int socket,
1230                     struct sockaddr *address,
1231                     socklen_t *address_len,
1232                     struct timeval *timeout)
1233 {
1234     int ret;
1235     fd_set rfd;
1236     FD_ZERO(&rfd);
1237     FD_SET(socket, &rfd);
1238     ret = select(socket + 1, &rfd, NULL, NULL, timeout);
1239     if(ret < 0)
1240         return ret;
1241     if(ret == 0) {
1242         errno = ETIMEDOUT;
1243         return -1;
1244     }
1245     return accept(socket, address, address_len);
1246 }
1247
1248 static FILE *
1249 dataconn(const char *name, off_t size, const char *mode)
1250 {
1251         char sizebuf[32];
1252         FILE *file;
1253         int domain, retry = 0;
1254
1255         file_size = size;
1256         byte_count = 0;
1257         if (size >= 0)
1258             snprintf(sizebuf, sizeof(sizebuf), " (%ld bytes)", (long)size);
1259         else
1260             *sizebuf = '\0';
1261         if (pdata >= 0) {
1262                 struct sockaddr_storage from_ss;
1263                 struct sockaddr *from = (struct sockaddr *)&from_ss;
1264                 struct timeval timeout;
1265                 int s;
1266                 socklen_t fromlen = sizeof(from_ss);
1267
1268                 timeout.tv_sec = 15;
1269                 timeout.tv_usec = 0;
1270                 s = accept_with_timeout(pdata, from, &fromlen, &timeout);
1271                 if (s < 0) {
1272                         reply(425, "Can't open data connection.");
1273                         close(pdata);
1274                         pdata = -1;
1275                         return (NULL);
1276                 }
1277                 close(pdata);
1278                 pdata = s;
1279 #if defined(IP_TOS) && defined(HAVE_SETSOCKOPT)
1280                 {
1281                     int tos = IPTOS_THROUGHPUT;
1282
1283                     setsockopt(s, IPPROTO_IP, IP_TOS, (void *)&tos,
1284                                sizeof(tos));
1285                 }
1286 #endif
1287                 reply(150, "Opening %s mode data connection for '%s'%s.",
1288                      type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf);
1289                 return (fdopen(pdata, mode));
1290         }
1291         if (data >= 0) {
1292                 reply(125, "Using existing data connection for '%s'%s.",
1293                     name, sizebuf);
1294                 usedefault = 1;
1295                 return (fdopen(data, mode));
1296         }
1297         if (usedefault)
1298                 data_dest = his_addr;
1299         usedefault = 1;
1300         /*
1301          * Default to using the same socket type as the ctrl address,
1302          * unless we know the type of the data address.
1303          */
1304         domain = data_dest->sa_family;
1305         if (domain == PF_UNSPEC)
1306             domain = ctrl_addr->sa_family;
1307
1308         file = getdatasock(mode, domain);
1309         if (file == NULL) {
1310                 char data_addr[256];
1311
1312                 if (inet_ntop (data_source->sa_family,
1313                                socket_get_address(data_source),
1314                                data_addr, sizeof(data_addr)) == NULL)
1315                         strlcpy (data_addr, "unknown address",
1316                                          sizeof(data_addr));
1317
1318                 reply(425, "Can't create data socket (%s,%d): %s.",
1319                       data_addr,
1320                       socket_get_port (data_source),
1321                       strerror(errno));
1322                 return (NULL);
1323         }
1324         data = fileno(file);
1325         while (connect(data, data_dest,
1326                        socket_sockaddr_size(data_dest)) < 0) {
1327                 if (errno == EADDRINUSE && retry < swaitmax) {
1328                         sleep(swaitint);
1329                         retry += swaitint;
1330                         continue;
1331                 }
1332                 perror_reply(425, "Can't build data connection");
1333                 fclose(file);
1334                 data = -1;
1335                 return (NULL);
1336         }
1337         reply(150, "Opening %s mode data connection for '%s'%s.",
1338              type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf);
1339         return (file);
1340 }
1341
1342 /*
1343  * Tranfer the contents of "instr" to "outstr" peer using the appropriate
1344  * encapsulation of the data subject * to Mode, Structure, and Type.
1345  *
1346  * NB: Form isn't handled.
1347  */
1348 static void
1349 send_data(FILE *instr, FILE *outstr)
1350 {
1351         int c, cnt, filefd, netfd;
1352         static char *buf;
1353         static size_t bufsize;
1354
1355         transflag = 1;
1356         switch (type) {
1357
1358         case TYPE_A:
1359             while ((c = getc(instr)) != EOF) {
1360                 if (urgflag && handleoobcmd())
1361                     return;
1362                 byte_count++;
1363                 if(c == '\n')
1364                     sec_putc('\r', outstr);
1365                 sec_putc(c, outstr);
1366             }
1367             sec_fflush(outstr);
1368             transflag = 0;
1369             urgflag = 0;
1370             if (ferror(instr))
1371                 goto file_err;
1372             if (ferror(outstr))
1373                 goto data_err;
1374             reply(226, "Transfer complete.");
1375             return;
1376
1377         case TYPE_I:
1378         case TYPE_L:
1379 #if 0 /* XXX handle urg flag */
1380 #if defined(HAVE_MMAP) && !defined(NO_MMAP)
1381 #ifndef MAP_FAILED
1382 #define MAP_FAILED (-1)
1383 #endif
1384             {
1385                 struct stat st;
1386                 char *chunk;
1387                 int in = fileno(instr);
1388                 if(fstat(in, &st) == 0 && S_ISREG(st.st_mode)
1389                    && st.st_size > 0) {
1390                     /*
1391                      * mmap zero bytes has potential of loosing, don't do it.
1392                      */
1393                     chunk = mmap(0, st.st_size, PROT_READ,
1394                                  MAP_SHARED, in, 0);
1395                     if((void *)chunk != (void *)MAP_FAILED) {
1396                         cnt = st.st_size - restart_point;
1397                         sec_write(fileno(outstr), chunk + restart_point, cnt);
1398                         if (munmap(chunk, st.st_size) < 0)
1399                             warn ("munmap");
1400                         sec_fflush(outstr);
1401                         byte_count = cnt;
1402                         transflag = 0;
1403                         urgflag = 0;
1404                     }
1405                 }
1406             }
1407 #endif
1408 #endif
1409         if(transflag) {
1410             struct stat st;
1411
1412             netfd = fileno(outstr);
1413             filefd = fileno(instr);
1414             buf = alloc_buffer (buf, &bufsize,
1415                                 fstat(filefd, &st) >= 0 ? &st : NULL);
1416             if (buf == NULL) {
1417                 transflag = 0;
1418                 urgflag = 0;
1419                 perror_reply(451, "Local resource failure: malloc");
1420                 return;
1421             }
1422             while ((cnt = read(filefd, buf, bufsize)) > 0 &&
1423                    sec_write(netfd, buf, cnt) == cnt) {
1424                 byte_count += cnt;
1425                 if (urgflag && handleoobcmd())
1426                     return;
1427             }
1428             sec_fflush(outstr); /* to end an encrypted stream */
1429             transflag = 0;
1430             urgflag = 0;
1431             if (cnt != 0) {
1432                 if (cnt < 0)
1433                     goto file_err;
1434                 goto data_err;
1435             }
1436         }
1437         reply(226, "Transfer complete.");
1438         return;
1439         default:
1440             transflag = 0;
1441             urgflag = 0;
1442             reply(550, "Unimplemented TYPE %d in send_data", type);
1443             return;
1444         }
1445
1446 data_err:
1447         transflag = 0;
1448         urgflag = 0;
1449         perror_reply(426, "Data connection");
1450         return;
1451
1452 file_err:
1453         transflag = 0;
1454         urgflag = 0;
1455         perror_reply(551, "Error on input file");
1456 }
1457
1458 /*
1459  * Transfer data from peer to "outstr" using the appropriate encapulation of
1460  * the data subject to Mode, Structure, and Type.
1461  *
1462  * N.B.: Form isn't handled.
1463  */
1464 static int
1465 receive_data(FILE *instr, FILE *outstr)
1466 {
1467     int cnt, bare_lfs = 0;
1468     static char *buf;
1469     static size_t bufsize;
1470     struct stat st;
1471
1472     transflag = 1;
1473
1474     buf = alloc_buffer (buf, &bufsize,
1475                         fstat(fileno(outstr), &st) >= 0 ? &st : NULL);
1476     if (buf == NULL) {
1477         transflag = 0;
1478         urgflag = 0;
1479         perror_reply(451, "Local resource failure: malloc");
1480         return -1;
1481     }
1482
1483     switch (type) {
1484
1485     case TYPE_I:
1486     case TYPE_L:
1487         while ((cnt = sec_read(fileno(instr), buf, bufsize)) > 0) {
1488             if (write(fileno(outstr), buf, cnt) != cnt)
1489                 goto file_err;
1490             byte_count += cnt;
1491             if (urgflag && handleoobcmd())
1492                 return (-1);
1493         }
1494         if (cnt < 0)
1495             goto data_err;
1496         transflag = 0;
1497         urgflag = 0;
1498         return (0);
1499
1500     case TYPE_E:
1501         reply(553, "TYPE E not implemented.");
1502         transflag = 0;
1503         urgflag = 0;
1504         return (-1);
1505
1506     case TYPE_A:
1507     {
1508         char *p, *q;
1509         int cr_flag = 0;
1510         while ((cnt = sec_read(fileno(instr),
1511                                 buf + cr_flag,
1512                                 bufsize - cr_flag)) > 0){
1513             if (urgflag && handleoobcmd())
1514                 return (-1);
1515             byte_count += cnt;
1516             cnt += cr_flag;
1517             cr_flag = 0;
1518             for(p = buf, q = buf; p < buf + cnt;) {
1519                 if(*p == '\n')
1520                     bare_lfs++;
1521                 if(*p == '\r') {
1522                     if(p == buf + cnt - 1){
1523                         cr_flag = 1;
1524                         p++;
1525                         continue;
1526                     }else if(p[1] == '\n'){
1527                         *q++ = '\n';
1528                         p += 2;
1529                         continue;
1530                     }
1531                 }
1532                 *q++ = *p++;
1533             }
1534             fwrite(buf, q - buf, 1, outstr);
1535             if(cr_flag)
1536                 buf[0] = '\r';
1537         }
1538         if(cr_flag)
1539             putc('\r', outstr);
1540         fflush(outstr);
1541         if (ferror(instr))
1542             goto data_err;
1543         if (ferror(outstr))
1544             goto file_err;
1545         transflag = 0;
1546         urgflag = 0;
1547         if (bare_lfs) {
1548             lreply(226, "WARNING! %d bare linefeeds received in ASCII mode\r\n"
1549                    "    File may not have transferred correctly.\r\n",
1550                    bare_lfs);
1551         }
1552         return (0);
1553     }
1554     default:
1555         reply(550, "Unimplemented TYPE %d in receive_data", type);
1556         transflag = 0;
1557         urgflag = 0;
1558         return (-1);
1559     }
1560
1561 data_err:
1562     transflag = 0;
1563     urgflag = 0;
1564     perror_reply(426, "Data Connection");
1565     return (-1);
1566
1567 file_err:
1568     transflag = 0;
1569     urgflag = 0;
1570     perror_reply(452, "Error writing file");
1571     return (-1);
1572 }
1573
1574 void
1575 statfilecmd(char *filename)
1576 {
1577         FILE *fin;
1578         int c;
1579         char line[LINE_MAX];
1580
1581         snprintf(line, sizeof(line), "/bin/ls -la -- %s", filename);
1582         fin = ftpd_popen(line, "r", 1, 0);
1583         lreply(211, "status of %s:", filename);
1584         while ((c = getc(fin)) != EOF) {
1585                 if (c == '\n') {
1586                         if (ferror(stdout)){
1587                                 perror_reply(421, "control connection");
1588                                 ftpd_pclose(fin);
1589                                 dologout(1);
1590                                 /* NOTREACHED */
1591                         }
1592                         if (ferror(fin)) {
1593                                 perror_reply(551, filename);
1594                                 ftpd_pclose(fin);
1595                                 return;
1596                         }
1597                         putc('\r', stdout);
1598                 }
1599                 putc(c, stdout);
1600         }
1601         ftpd_pclose(fin);
1602         reply(211, "End of Status");
1603 }
1604
1605 void
1606 statcmd(void)
1607 {
1608 #if 0
1609         struct sockaddr_in *sin;
1610         u_char *a, *p;
1611
1612         lreply(211, "%s FTP server (%s) status:", hostname, version);
1613         printf("     %s\r\n", version);
1614         printf("     Connected to %s", remotehost);
1615         if (!isdigit((unsigned char)remotehost[0]))
1616                 printf(" (%s)", inet_ntoa(his_addr.sin_addr));
1617         printf("\r\n");
1618         if (logged_in) {
1619                 if (guest)
1620                         printf("     Logged in anonymously\r\n");
1621                 else
1622                         printf("     Logged in as %s\r\n", pw->pw_name);
1623         } else if (askpasswd)
1624                 printf("     Waiting for password\r\n");
1625         else
1626                 printf("     Waiting for user name\r\n");
1627         printf("     TYPE: %s", typenames[type]);
1628         if (type == TYPE_A || type == TYPE_E)
1629                 printf(", FORM: %s", formnames[form]);
1630         if (type == TYPE_L)
1631 #if NBBY == 8
1632                 printf(" %d", NBBY);
1633 #else
1634                 printf(" %d", bytesize);        /* need definition! */
1635 #endif
1636         printf("; STRUcture: %s; transfer MODE: %s\r\n",
1637             strunames[stru], modenames[mode]);
1638         if (data != -1)
1639                 printf("     Data connection open\r\n");
1640         else if (pdata != -1) {
1641                 printf("     in Passive mode");
1642                 sin = &pasv_addr;
1643                 goto printaddr;
1644         } else if (usedefault == 0) {
1645                 printf("     PORT");
1646                 sin = &data_dest;
1647 printaddr:
1648                 a = (u_char *) &sin->sin_addr;
1649                 p = (u_char *) &sin->sin_port;
1650 #define UC(b) (((int) b) & 0xff)
1651                 printf(" (%d,%d,%d,%d,%d,%d)\r\n", UC(a[0]),
1652                         UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1]));
1653 #undef UC
1654         } else
1655                 printf("     No data connection\r\n");
1656 #endif
1657         reply(211, "End of status");
1658 }
1659
1660 void
1661 fatal(char *s)
1662 {
1663
1664         reply(451, "Error in server: %s\n", s);
1665         reply(221, "Closing connection due to server error.");
1666         dologout(0);
1667         /* NOTREACHED */
1668 }
1669
1670 static void
1671 int_reply(int, char *, const char *, va_list)
1672 #ifdef __GNUC__
1673 __attribute__ ((format (printf, 3, 0)))
1674 #endif
1675 ;
1676
1677 static void
1678 int_reply(int n, char *c, const char *fmt, va_list ap)
1679 {
1680     char buf[10240];
1681     char *p;
1682     p=buf;
1683     if(n){
1684         snprintf(p, sizeof(buf), "%d%s", n, c);
1685         p+=strlen(p);
1686     }
1687     vsnprintf(p, sizeof(buf) - strlen(p), fmt, ap);
1688     p+=strlen(p);
1689     snprintf(p, sizeof(buf) - strlen(p), "\r\n");
1690     p+=strlen(p);
1691     sec_fprintf(stdout, "%s", buf);
1692     fflush(stdout);
1693     if (debug)
1694         syslog(LOG_DEBUG, "<--- %s- ", buf);
1695 }
1696
1697 void
1698 reply(int n, const char *fmt, ...)
1699 {
1700   va_list ap;
1701   va_start(ap, fmt);
1702   int_reply(n, " ", fmt, ap);
1703   delete_ftp_command();
1704   va_end(ap);
1705 }
1706
1707 void
1708 lreply(int n, const char *fmt, ...)
1709 {
1710   va_list ap;
1711   va_start(ap, fmt);
1712   int_reply(n, "-", fmt, ap);
1713   va_end(ap);
1714 }
1715
1716 void
1717 nreply(const char *fmt, ...)
1718 {
1719   va_list ap;
1720   va_start(ap, fmt);
1721   int_reply(0, NULL, fmt, ap);
1722   va_end(ap);
1723 }
1724
1725 static void
1726 ack(char *s)
1727 {
1728
1729         reply(250, "%s command successful.", s);
1730 }
1731
1732 void
1733 nack(char *s)
1734 {
1735
1736         reply(502, "%s command not implemented.", s);
1737 }
1738
1739 void
1740 do_delete(char *name)
1741 {
1742         struct stat st;
1743
1744         LOGCMD("delete", name);
1745         if (stat(name, &st) < 0) {
1746                 perror_reply(550, name);
1747                 return;
1748         }
1749         if (S_ISDIR(st.st_mode)) {
1750                 if (rmdir(name) < 0) {
1751                         perror_reply(550, name);
1752                         return;
1753                 }
1754                 goto done;
1755         }
1756         if (unlink(name) < 0) {
1757                 perror_reply(550, name);
1758                 return;
1759         }
1760 done:
1761         ack("DELE");
1762 }
1763
1764 void
1765 cwd(const char *path)
1766 {
1767
1768         if (chdir(path) < 0)
1769                 perror_reply(550, path);
1770         else
1771                 ack("CWD");
1772 }
1773
1774 void
1775 makedir(char *name)
1776 {
1777
1778         LOGCMD("mkdir", name);
1779         if(guest && filename_check(name))
1780             return;
1781         if (mkdir(name, 0777) < 0)
1782                 perror_reply(550, name);
1783         else{
1784             if(guest)
1785                 chmod(name, 0700); /* guest has umask 777 */
1786             reply(257, "MKD command successful.");
1787         }
1788 }
1789
1790 void
1791 removedir(char *name)
1792 {
1793
1794         LOGCMD("rmdir", name);
1795         if (rmdir(name) < 0)
1796                 perror_reply(550, name);
1797         else
1798                 ack("RMD");
1799 }
1800
1801 void
1802 pwd(void)
1803 {
1804     char path[MaxPathLen];
1805     char *ret;
1806
1807     /* SunOS has a broken getcwd that does popen(pwd) (!!!), this
1808      * failes miserably when running chroot
1809      */
1810     ret = getcwd(path, sizeof(path));
1811     if (ret == NULL)
1812         reply(550, "%s.", strerror(errno));
1813     else
1814         reply(257, "\"%s\" is current directory.", path);
1815 }
1816
1817 char *
1818 renamefrom(char *name)
1819 {
1820         struct stat st;
1821
1822         if (stat(name, &st) < 0) {
1823                 perror_reply(550, name);
1824                 return NULL;
1825         }
1826         reply(350, "File exists, ready for destination name");
1827         return (name);
1828 }
1829
1830 void
1831 renamecmd(char *from, char *to)
1832 {
1833
1834         LOGCMD2("rename", from, to);
1835         if(guest && filename_check(to))
1836             return;
1837         if (rename(from, to) < 0)
1838                 perror_reply(550, "rename");
1839         else
1840                 ack("RNTO");
1841 }
1842
1843 static void
1844 dolog(struct sockaddr *sa, int len)
1845 {
1846         getnameinfo_verified (sa, len, remotehost, sizeof(remotehost),
1847                               NULL, 0, 0);
1848 #ifdef HAVE_SETPROCTITLE
1849         snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost);
1850         setproctitle("%s", proctitle);
1851 #endif /* HAVE_SETPROCTITLE */
1852
1853         if (logging) {
1854                 char data_addr[256];
1855
1856                 if (inet_ntop (his_addr->sa_family,
1857                                socket_get_address(his_addr),
1858                                data_addr, sizeof(data_addr)) == NULL)
1859                         strlcpy (data_addr, "unknown address",
1860                                          sizeof(data_addr));
1861
1862
1863                 syslog(LOG_INFO, "connection from %s(%s)",
1864                        remotehost,
1865                        data_addr);
1866         }
1867 }
1868
1869 /*
1870  * Record logout in wtmp file
1871  * and exit with supplied status.
1872  */
1873 void
1874 dologout(int status)
1875 {
1876     transflag = 0;
1877     urgflag = 0;
1878     if (logged_in) {
1879 #if KRB5
1880         cond_kdestroy();
1881 #endif
1882         seteuid((uid_t)0); /* No need to check, we call exit() below */
1883         ftpd_logwtmp(ttyline, "", "");
1884     }
1885     /* beware of flushing buffers after a SIGPIPE */
1886 #ifdef XXX
1887     exit(status);
1888 #else
1889     _exit(status);
1890 #endif
1891 }
1892
1893 void abor(void)
1894 {
1895     if (!transflag)
1896         return;
1897     reply(426, "Transfer aborted. Data connection closed.");
1898     reply(226, "Abort successful");
1899     transflag = 0;
1900 }
1901
1902 static void
1903 myoob(int signo)
1904 {
1905     urgflag = 1;
1906 }
1907
1908 static char *
1909 mec_space(char *p)
1910 {
1911     while(isspace(*(unsigned char *)p))
1912           p++;
1913     return p;
1914 }
1915
1916 static int
1917 handleoobcmd(void)
1918 {
1919         char *cp;
1920
1921         /* only process if transfer occurring */
1922         if (!transflag)
1923                 return 0;
1924
1925         urgflag = 0;
1926
1927         cp = tmpline;
1928         if (ftpd_getline(cp, sizeof(tmpline)) == NULL) {
1929                 reply(221, "You could at least say goodbye.");
1930                 dologout(0);
1931         }
1932
1933         if (strncasecmp("MIC", cp, 3) == 0) {
1934             mec(mec_space(cp + 3), prot_safe);
1935         } else if (strncasecmp("CONF", cp, 4) == 0) {
1936             mec(mec_space(cp + 4), prot_confidential);
1937         } else if (strncasecmp("ENC", cp, 3) == 0) {
1938             mec(mec_space(cp + 3), prot_private);
1939         } else if (!allow_insecure_oob) {
1940             reply(533, "Command protection level denied "
1941                   "for paranoid reasons.");
1942             goto out;
1943         }
1944
1945         if (secure_command())
1946             cp = ftp_command;
1947
1948         if (strcasecmp(cp, "ABOR\r\n") == 0) {
1949                 abor();
1950         } else if (strcasecmp(cp, "STAT\r\n") == 0) {
1951                 if (file_size != (off_t) -1)
1952                         reply(213, "Status: %ld of %ld bytes transferred",
1953                               (long)byte_count,
1954                               (long)file_size);
1955                 else
1956                         reply(213, "Status: %ld bytes transferred",
1957                               (long)byte_count);
1958         }
1959 out:
1960         return (transflag == 0);
1961 }
1962
1963 /*
1964  * Note: a response of 425 is not mentioned as a possible response to
1965  *      the PASV command in RFC959. However, it has been blessed as
1966  *      a legitimate response by Jon Postel in a telephone conversation
1967  *      with Rick Adams on 25 Jan 89.
1968  */
1969 void
1970 pasv(void)
1971 {
1972         socklen_t len;
1973         char *p, *a;
1974         struct sockaddr_in *sin;
1975
1976         if (ctrl_addr->sa_family != AF_INET) {
1977                 reply(425,
1978                       "You cannot do PASV with something that's not IPv4");
1979                 return;
1980         }
1981
1982         if(pdata != -1)
1983             close(pdata);
1984
1985         pdata = socket(ctrl_addr->sa_family, SOCK_STREAM, 0);
1986         if (pdata < 0) {
1987                 perror_reply(425, "Can't open passive connection");
1988                 return;
1989         }
1990         pasv_addr->sa_family = ctrl_addr->sa_family;
1991         socket_set_address_and_port (pasv_addr,
1992                                      socket_get_address (ctrl_addr),
1993                                      0);
1994         socket_set_portrange(pdata, restricted_data_ports,
1995             pasv_addr->sa_family);
1996         if (seteuid(0) < 0)
1997                 fatal("Failed to seteuid");
1998         if (bind(pdata, pasv_addr, socket_sockaddr_size (pasv_addr)) < 0) {
1999                 if (seteuid(pw->pw_uid) < 0)
2000                         fatal("Failed to seteuid");
2001                 goto pasv_error;
2002         }
2003         if (seteuid(pw->pw_uid) < 0)
2004                 fatal("Failed to seteuid");
2005         len = sizeof(pasv_addr_ss);
2006         if (getsockname(pdata, pasv_addr, &len) < 0)
2007                 goto pasv_error;
2008         if (listen(pdata, 1) < 0)
2009                 goto pasv_error;
2010         sin = (struct sockaddr_in *)pasv_addr;
2011         a = (char *) &sin->sin_addr;
2012         p = (char *) &sin->sin_port;
2013
2014 #define UC(b) (((int) b) & 0xff)
2015
2016         reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]),
2017                 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1]));
2018         return;
2019
2020 pasv_error:
2021         close(pdata);
2022         pdata = -1;
2023         perror_reply(425, "Can't open passive connection");
2024         return;
2025 }
2026
2027 void
2028 epsv(char *proto)
2029 {
2030         socklen_t len;
2031
2032         pdata = socket(ctrl_addr->sa_family, SOCK_STREAM, 0);
2033         if (pdata < 0) {
2034                 perror_reply(425, "Can't open passive connection");
2035                 return;
2036         }
2037         pasv_addr->sa_family = ctrl_addr->sa_family;
2038         socket_set_address_and_port (pasv_addr,
2039                                      socket_get_address (ctrl_addr),
2040                                      0);
2041         socket_set_portrange(pdata, restricted_data_ports,
2042             pasv_addr->sa_family);
2043         if (seteuid(0) < 0)
2044                 fatal("Failed to seteuid");
2045         if (bind(pdata, pasv_addr, socket_sockaddr_size (pasv_addr)) < 0) {
2046                 if (seteuid(pw->pw_uid))
2047                         fatal("Failed to seteuid");
2048                 goto pasv_error;
2049         }
2050         if (seteuid(pw->pw_uid) < 0)
2051                 fatal("Failed to seteuid");
2052         len = sizeof(pasv_addr_ss);
2053         if (getsockname(pdata, pasv_addr, &len) < 0)
2054                 goto pasv_error;
2055         if (listen(pdata, 1) < 0)
2056                 goto pasv_error;
2057
2058         reply(229, "Entering Extended Passive Mode (|||%d|)",
2059               ntohs(socket_get_port (pasv_addr)));
2060         return;
2061
2062 pasv_error:
2063         close(pdata);
2064         pdata = -1;
2065         perror_reply(425, "Can't open passive connection");
2066         return;
2067 }
2068
2069 void
2070 eprt(char *str)
2071 {
2072         char *end;
2073         char sep;
2074         int af;
2075         int ret;
2076         int port;
2077
2078         usedefault = 0;
2079         if (pdata >= 0) {
2080             close(pdata);
2081             pdata = -1;
2082         }
2083
2084         sep = *str++;
2085         if (sep == '\0') {
2086                 reply(500, "Bad syntax in EPRT");
2087                 return;
2088         }
2089         af = strtol (str, &end, 0);
2090         if (af == 0 || *end != sep) {
2091                 reply(500, "Bad syntax in EPRT");
2092                 return;
2093         }
2094         str = end + 1;
2095         switch (af) {
2096 #ifdef HAVE_IPV6
2097         case 2 :
2098             data_dest->sa_family = AF_INET6;
2099             break;
2100 #endif
2101         case 1 :
2102             data_dest->sa_family = AF_INET;
2103                 break;
2104         default :
2105                 reply(522, "Network protocol %d not supported, use (1"
2106 #ifdef HAVE_IPV6
2107                       ",2"
2108 #endif
2109                       ")", af);
2110                 return;
2111         }
2112         end = strchr (str, sep);
2113         if (end == NULL) {
2114                 reply(500, "Bad syntax in EPRT");
2115                 return;
2116         }
2117         *end = '\0';
2118         ret = inet_pton (data_dest->sa_family, str,
2119                          socket_get_address (data_dest));
2120
2121         if (ret != 1) {
2122                 reply(500, "Bad address syntax in EPRT");
2123                 return;
2124         }
2125         str = end + 1;
2126         port = strtol (str, &end, 0);
2127         if (port == 0 || *end != sep) {
2128                 reply(500, "Bad port syntax in EPRT");
2129                 return;
2130         }
2131         if (port < IPPORT_RESERVED) {
2132                 reply(500, "Bad port in invalid range in EPRT");
2133                 return;
2134         }
2135         socket_set_port (data_dest, htons(port));
2136
2137         if (paranoid &&
2138             (data_dest->sa_family != his_addr->sa_family ||
2139              memcmp(socket_get_address(data_dest), socket_get_address(his_addr), socket_sockaddr_size(data_dest)) != 0))
2140         {
2141                 reply(500, "Bad address in EPRT");
2142         }
2143         reply(200, "EPRT command successful.");
2144 }
2145
2146 /*
2147  * Generate unique name for file with basename "local".
2148  * The file named "local" is already known to exist.
2149  * Generates failure reply on error.
2150  */
2151 static char *
2152 gunique(char *local)
2153 {
2154         static char new[MaxPathLen];
2155         struct stat st;
2156         int count;
2157         char *cp;
2158
2159         cp = strrchr(local, '/');
2160         if (cp)
2161                 *cp = '\0';
2162         if (stat(cp ? local : ".", &st) < 0) {
2163                 perror_reply(553, cp ? local : ".");
2164                 return NULL;
2165         }
2166         if (cp)
2167                 *cp = '/';
2168         for (count = 1; count < 100; count++) {
2169                 snprintf (new, sizeof(new), "%s.%d", local, count);
2170                 if (stat(new, &st) < 0)
2171                         return (new);
2172         }
2173         reply(452, "Unique file name cannot be created.");
2174         return (NULL);
2175 }
2176
2177 /*
2178  * Format and send reply containing system error number.
2179  */
2180 void
2181 perror_reply(int code, const char *string)
2182 {
2183         reply(code, "%s: %s.", string, strerror(errno));
2184 }
2185
2186 static char *onefile[] = {
2187         "",
2188         0
2189 };
2190
2191 void
2192 list_file(char *file)
2193 {
2194     if(use_builtin_ls) {
2195         FILE *dout;
2196         dout = dataconn(file, -1, "w");
2197         if (dout == NULL)
2198             return;
2199         set_buffer_size(fileno(dout), 0);
2200         if(builtin_ls(dout, file) == 0)
2201             reply(226, "Transfer complete.");
2202         else
2203             reply(451, "Requested action aborted. Local error in processing.");
2204         fclose(dout);
2205         data = -1;
2206         pdata = -1;
2207     } else {
2208 #ifdef HAVE_LS_A
2209         const char *cmd = "/bin/ls -lA %s";
2210 #else
2211         const char *cmd = "/bin/ls -la %s";
2212 #endif
2213         retrieve(cmd, file);
2214     }
2215 }
2216
2217 void
2218 send_file_list(char *whichf)
2219 {
2220     struct stat st;
2221     DIR *dirp = NULL;
2222     struct dirent *dir;
2223     FILE *dout = NULL;
2224     char **dirlist, *dirname;
2225     int simple = 0;
2226     int freeglob = 0;
2227     glob_t gl;
2228     char buf[MaxPathLen];
2229
2230     if (strpbrk(whichf, "~{[*?") != NULL) {
2231         int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE|
2232 #ifdef GLOB_MAXPATH
2233             GLOB_MAXPATH
2234 #else
2235             GLOB_LIMIT
2236 #endif
2237             ;
2238
2239         memset(&gl, 0, sizeof(gl));
2240         freeglob = 1;
2241         if (glob(whichf, flags, 0, &gl)) {
2242             reply(550, "not found");
2243             goto out;
2244         } else if (gl.gl_pathc == 0) {
2245             errno = ENOENT;
2246             perror_reply(550, whichf);
2247             goto out;
2248         }
2249         dirlist = gl.gl_pathv;
2250     } else {
2251         onefile[0] = whichf;
2252         dirlist = onefile;
2253         simple = 1;
2254     }
2255
2256     while ((dirname = *dirlist++)) {
2257
2258         if (urgflag && handleoobcmd())
2259             goto out;
2260
2261         if (stat(dirname, &st) < 0) {
2262             /*
2263              * If user typed "ls -l", etc, and the client
2264              * used NLST, do what the user meant.
2265              */
2266             if (dirname[0] == '-' && *dirlist == NULL &&
2267                 transflag == 0) {
2268                 list_file(dirname);
2269                 goto out;
2270             }
2271             perror_reply(550, whichf);
2272             goto out;
2273         }
2274
2275         if (S_ISREG(st.st_mode)) {
2276             if (dout == NULL) {
2277                 dout = dataconn("file list", (off_t)-1, "w");
2278                 if (dout == NULL)
2279                     goto out;
2280                 transflag = 1;
2281             }
2282             snprintf(buf, sizeof(buf), "%s%s\n", dirname,
2283                      type == TYPE_A ? "\r" : "");
2284             sec_write(fileno(dout), buf, strlen(buf));
2285             byte_count += strlen(dirname) + 1;
2286             continue;
2287         } else if (!S_ISDIR(st.st_mode))
2288             continue;
2289
2290         if ((dirp = opendir(dirname)) == NULL)
2291             continue;
2292
2293         while ((dir = readdir(dirp)) != NULL) {
2294             char nbuf[MaxPathLen];
2295
2296             if (urgflag && handleoobcmd())
2297                 goto out;
2298
2299             if (!strcmp(dir->d_name, "."))
2300                 continue;
2301             if (!strcmp(dir->d_name, ".."))
2302                 continue;
2303
2304             snprintf(nbuf, sizeof(nbuf), "%s/%s", dirname, dir->d_name);
2305
2306             /*
2307              * We have to do a stat to insure it's
2308              * not a directory or special file.
2309              */
2310             if (simple || (stat(nbuf, &st) == 0 &&
2311                            S_ISREG(st.st_mode))) {
2312                 if (dout == NULL) {
2313                     dout = dataconn("file list", (off_t)-1, "w");
2314                     if (dout == NULL)
2315                         goto out;
2316                     transflag = 1;
2317                 }
2318                 if(strncmp(nbuf, "./", 2) == 0)
2319                     snprintf(buf, sizeof(buf), "%s%s\n", nbuf +2,
2320                              type == TYPE_A ? "\r" : "");
2321                 else
2322                     snprintf(buf, sizeof(buf), "%s%s\n", nbuf,
2323                              type == TYPE_A ? "\r" : "");
2324                 sec_write(fileno(dout), buf, strlen(buf));
2325                 byte_count += strlen(nbuf) + 1;
2326             }
2327         }
2328         closedir(dirp);
2329     }
2330     if (dout == NULL)
2331         reply(550, "No files found.");
2332     else if (ferror(dout) != 0)
2333         perror_reply(550, "Data connection");
2334     else
2335         reply(226, "Transfer complete.");
2336
2337 out:
2338     transflag = 0;
2339     if (dout != NULL){
2340         sec_write(fileno(dout), buf, 0); /* XXX flush */
2341
2342         fclose(dout);
2343     }
2344     data = -1;
2345     pdata = -1;
2346     if (freeglob)
2347         globfree(&gl);
2348 }
2349
2350
2351 int
2352 find(char *pattern)
2353 {
2354     char line[1024];
2355     FILE *f;
2356
2357     snprintf(line, sizeof(line),
2358              "/bin/locate -d %s -- %s",
2359              ftp_rooted("/etc/locatedb"),
2360              pattern);
2361     f = ftpd_popen(line, "r", 1, 1);
2362     if(f == NULL){
2363         perror_reply(550, "/bin/locate");
2364         return 1;
2365     }
2366     lreply(200, "Output from find.");
2367     while(fgets(line, sizeof(line), f)){
2368         if(line[strlen(line)-1] == '\n')
2369             line[strlen(line)-1] = 0;
2370         nreply("%s", line);
2371     }
2372     reply(200, "Done");
2373     ftpd_pclose(f);
2374     return 0;
2375 }
2376