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 #if 0 35 #ifndef lint 36 static char copyright[] = 37 "@(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994\n\ 38 The Regents of the University of California. All rights reserved.\n"; 39 #endif /* not lint */ 40 #endif 41 42 #ifndef lint 43 #if 0 44 static char sccsid[] = "@(#)ftpd.c 8.4 (Berkeley) 4/16/94"; 45 #endif 46 static const char rcsid[] = 47 "$FreeBSD$"; 48 #endif /* not lint */ 49 50 /* 51 * FTP server. 52 */ 53 #include <sys/param.h> 54 #include <sys/ioctl.h> 55 #include <sys/mman.h> 56 #include <sys/socket.h> 57 #include <sys/stat.h> 58 #include <sys/time.h> 59 #include <sys/wait.h> 60 61 #include <netinet/in.h> 62 #include <netinet/in_systm.h> 63 #include <netinet/ip.h> 64 #include <netinet/tcp.h> 65 66 #define FTP_NAMES 67 #include <arpa/ftp.h> 68 #include <arpa/inet.h> 69 #include <arpa/telnet.h> 70 71 #include <ctype.h> 72 #include <dirent.h> 73 #include <err.h> 74 #include <errno.h> 75 #include <fcntl.h> 76 #include <glob.h> 77 #include <limits.h> 78 #include <netdb.h> 79 #include <pwd.h> 80 #include <grp.h> 81 #include <opie.h> 82 #include <signal.h> 83 #include <stdio.h> 84 #include <stdlib.h> 85 #include <string.h> 86 #include <syslog.h> 87 #include <time.h> 88 #include <unistd.h> 89 #include <libutil.h> 90 #ifdef LOGIN_CAP 91 #include <login_cap.h> 92 #endif 93 94 #ifdef USE_PAM 95 #include <security/pam_appl.h> 96 #endif 97 98 #include "pathnames.h" 99 #include "extern.h" 100 101 #include <stdarg.h> 102 103 static char version[] = "Version 6.00LS"; 104 #undef main 105 106 extern off_t restart_point; 107 extern char cbuf[]; 108 109 union sockunion server_addr; 110 union sockunion ctrl_addr; 111 union sockunion data_source; 112 union sockunion data_dest; 113 union sockunion his_addr; 114 union sockunion pasv_addr; 115 116 int daemon_mode; 117 int data; 118 int logged_in; 119 struct passwd *pw; 120 int ftpdebug; 121 int timeout = 900; /* timeout after 15 minutes of inactivity */ 122 int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 123 int logging; 124 int restricted_data_ports = 1; 125 int paranoid = 1; /* be extra careful about security */ 126 int anon_only = 0; /* Only anonymous ftp allowed */ 127 int guest; 128 int dochroot; 129 int dowtmp = 1; 130 int stats; 131 int statfd = -1; 132 int type; 133 int form; 134 int stru; /* avoid C keyword */ 135 int mode; 136 int usedefault = 1; /* for data transfers */ 137 int pdata = -1; /* for passive mode */ 138 int readonly=0; /* Server is in readonly mode. */ 139 int noepsv=0; /* EPSV command is disabled. */ 140 int noretr=0; /* RETR command is disabled. */ 141 int noguestretr=0; /* RETR command is disabled for anon users. */ 142 int noguestmkd=0; /* MKD command is disabled for anon users. */ 143 int noguestmod=1; /* anon users may not modify existing files. */ 144 145 static volatile sig_atomic_t recvurg; 146 sig_atomic_t transflag; 147 off_t file_size; 148 off_t byte_count; 149 #if !defined(CMASK) || CMASK == 0 150 #undef CMASK 151 #define CMASK 027 152 #endif 153 int defumask = CMASK; /* default umask value */ 154 char tmpline[7]; 155 char *hostname; 156 int epsvall = 0; 157 158 #ifdef VIRTUAL_HOSTING 159 char *ftpuser; 160 161 static struct ftphost { 162 struct ftphost *next; 163 struct addrinfo *hostinfo; 164 char *hostname; 165 char *anonuser; 166 char *statfile; 167 char *welcome; 168 char *loginmsg; 169 } *thishost, *firsthost; 170 171 #endif 172 char remotehost[MAXHOSTNAMELEN]; 173 char *ident = NULL; 174 175 static char ttyline[20]; 176 char *tty = ttyline; /* for klogin */ 177 178 #ifdef USE_PAM 179 static int auth_pam(struct passwd**, const char*); 180 pam_handle_t *pamh = NULL; 181 #endif 182 183 static struct opie opiedata; 184 static char opieprompt[OPIE_CHALLENGE_MAX+1]; 185 static int pwok; 186 187 char *pid_file = NULL; 188 189 /* 190 * Limit number of pathnames that glob can return. 191 * A limit of 0 indicates the number of pathnames is unlimited. 192 */ 193 #define MAXGLOBARGS 16384 194 # 195 196 /* 197 * Timeout intervals for retrying connections 198 * to hosts that don't accept PORT cmds. This 199 * is a kludge, but given the problems with TCP... 200 */ 201 #define SWAITMAX 90 /* wait at most 90 seconds */ 202 #define SWAITINT 5 /* interval between retries */ 203 204 int swaitmax = SWAITMAX; 205 int swaitint = SWAITINT; 206 207 #ifdef SETPROCTITLE 208 #ifdef OLD_SETPROCTITLE 209 char **Argv = NULL; /* pointer to argument vector */ 210 char *LastArgv = NULL; /* end of argv */ 211 #endif /* OLD_SETPROCTITLE */ 212 char proctitle[LINE_MAX]; /* initial part of title */ 213 #endif /* SETPROCTITLE */ 214 215 #define LOGCMD(cmd, file) \ 216 if (logging > 1) \ 217 syslog(LOG_INFO,"%s %s%s", cmd, \ 218 *(file) == '/' ? "" : curdir(), file); 219 #define LOGCMD2(cmd, file1, file2) \ 220 if (logging > 1) \ 221 syslog(LOG_INFO,"%s %s%s %s%s", cmd, \ 222 *(file1) == '/' ? "" : curdir(), file1, \ 223 *(file2) == '/' ? "" : curdir(), file2); 224 #define LOGBYTES(cmd, file, cnt) \ 225 if (logging > 1) { \ 226 if (cnt == (off_t)-1) \ 227 syslog(LOG_INFO,"%s %s%s", cmd, \ 228 *(file) == '/' ? "" : curdir(), file); \ 229 else \ 230 syslog(LOG_INFO, "%s %s%s = %qd bytes", \ 231 cmd, (*(file) == '/') ? "" : curdir(), file, cnt); \ 232 } 233 234 #ifdef VIRTUAL_HOSTING 235 static void inithosts(void); 236 static void selecthost(union sockunion *); 237 #endif 238 static void ack(char *); 239 static void sigurg(int); 240 static void myoob(void); 241 static int checkuser(char *, char *, int); 242 static FILE *dataconn(char *, off_t, char *); 243 static void dolog(struct sockaddr *); 244 static char *curdir(void); 245 static void end_login(void); 246 static FILE *getdatasock(char *); 247 static int guniquefd(char *, char **); 248 static void lostconn(int); 249 static void sigquit(int); 250 static int receive_data(FILE *, FILE *); 251 static int send_data(FILE *, FILE *, off_t, off_t, int); 252 static struct passwd * 253 sgetpwnam(char *); 254 static char *sgetsave(char *); 255 static void reapchild(int); 256 static void logxfer(char *, off_t, time_t); 257 static char *doublequote(char *); 258 259 static char * 260 curdir(void) 261 { 262 static char path[MAXPATHLEN+1+1]; /* path + '/' + '\0' */ 263 264 if (getcwd(path, sizeof(path)-2) == NULL) 265 return (""); 266 if (path[1] != '\0') /* special case for root dir. */ 267 strcat(path, "/"); 268 /* For guest account, skip / since it's chrooted */ 269 return (guest ? path+1 : path); 270 } 271 272 int 273 main(int argc, char *argv[], char **envp) 274 { 275 int addrlen, ch, on = 1, tos; 276 char *cp, line[LINE_MAX]; 277 FILE *fd; 278 int error; 279 char *bindname = NULL; 280 int family = AF_UNSPEC; 281 int enable_v4 = 0; 282 struct sigaction sa; 283 284 tzset(); /* in case no timezone database in ~ftp */ 285 sigemptyset(&sa.sa_mask); 286 sa.sa_flags = SA_RESTART; 287 288 #ifdef OLD_SETPROCTITLE 289 /* 290 * Save start and extent of argv for setproctitle. 291 */ 292 Argv = argv; 293 while (*envp) 294 envp++; 295 LastArgv = envp[-1] + strlen(envp[-1]); 296 #endif /* OLD_SETPROCTITLE */ 297 298 299 while ((ch = getopt(argc, argv, "46a:AdDElmMoOp:rRSt:T:u:UvW")) != -1) { 300 switch (ch) { 301 case '4': 302 enable_v4 = 1; 303 if (family == AF_UNSPEC) 304 family = AF_INET; 305 break; 306 307 case '6': 308 family = AF_INET6; 309 break; 310 311 case 'a': 312 bindname = optarg; 313 break; 314 315 case 'A': 316 anon_only = 1; 317 break; 318 319 case 'd': 320 ftpdebug++; 321 break; 322 323 case 'D': 324 daemon_mode++; 325 break; 326 327 case 'E': 328 noepsv = 1; 329 break; 330 331 case 'l': 332 logging++; /* > 1 == extra logging */ 333 break; 334 335 case 'm': 336 noguestmod = 0; 337 break; 338 339 case 'M': 340 noguestmkd = 1; 341 break; 342 343 case 'o': 344 noretr = 1; 345 break; 346 347 case 'O': 348 noguestretr = 1; 349 break; 350 351 case 'p': 352 pid_file = optarg; 353 break; 354 355 case 'r': 356 readonly = 1; 357 break; 358 359 case 'R': 360 paranoid = 0; 361 break; 362 363 case 'S': 364 stats++; 365 break; 366 367 case 't': 368 timeout = atoi(optarg); 369 if (maxtimeout < timeout) 370 maxtimeout = timeout; 371 break; 372 373 case 'T': 374 maxtimeout = atoi(optarg); 375 if (timeout > maxtimeout) 376 timeout = maxtimeout; 377 break; 378 379 case 'u': 380 { 381 long val = 0; 382 383 val = strtol(optarg, &optarg, 8); 384 if (*optarg != '\0' || val < 0) 385 warnx("bad value for -u"); 386 else 387 defumask = val; 388 break; 389 } 390 case 'U': 391 restricted_data_ports = 0; 392 break; 393 394 case 'v': 395 ftpdebug++; 396 break; 397 398 case 'W': 399 dowtmp = 0; 400 break; 401 402 default: 403 warnx("unknown flag -%c ignored", optopt); 404 break; 405 } 406 } 407 408 #ifdef VIRTUAL_HOSTING 409 inithosts(); 410 #endif 411 (void) freopen(_PATH_DEVNULL, "w", stderr); 412 413 /* 414 * LOG_NDELAY sets up the logging connection immediately, 415 * necessary for anonymous ftp's that chroot and can't do it later. 416 */ 417 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 418 419 if (daemon_mode) { 420 int ctl_sock, fd; 421 struct addrinfo hints, *res; 422 423 /* 424 * Detach from parent. 425 */ 426 if (daemon(1, 1) < 0) { 427 syslog(LOG_ERR, "failed to become a daemon"); 428 exit(1); 429 } 430 sa.sa_handler = reapchild; 431 (void)sigaction(SIGCHLD, &sa, NULL); 432 /* init bind_sa */ 433 memset(&hints, 0, sizeof(hints)); 434 435 hints.ai_family = family == AF_UNSPEC ? AF_INET : family; 436 hints.ai_socktype = SOCK_STREAM; 437 hints.ai_protocol = 0; 438 hints.ai_flags = AI_PASSIVE; 439 error = getaddrinfo(bindname, "ftp", &hints, &res); 440 if (error) { 441 if (family == AF_UNSPEC) { 442 hints.ai_family = AF_UNSPEC; 443 error = getaddrinfo(bindname, "ftp", &hints, 444 &res); 445 } 446 } 447 if (error) { 448 syslog(LOG_ERR, "%s", gai_strerror(error)); 449 if (error == EAI_SYSTEM) 450 syslog(LOG_ERR, "%s", strerror(errno)); 451 exit(1); 452 } 453 if (res->ai_addr == NULL) { 454 syslog(LOG_ERR, "-a %s: getaddrinfo failed", hostname); 455 exit(1); 456 } else 457 family = res->ai_addr->sa_family; 458 /* 459 * Open a socket, bind it to the FTP port, and start 460 * listening. 461 */ 462 ctl_sock = socket(family, SOCK_STREAM, 0); 463 if (ctl_sock < 0) { 464 syslog(LOG_ERR, "control socket: %m"); 465 exit(1); 466 } 467 if (setsockopt(ctl_sock, SOL_SOCKET, SO_REUSEADDR, 468 &on, sizeof(on)) < 0) 469 syslog(LOG_WARNING, 470 "control setsockopt (SO_REUSEADDR): %m"); 471 if (family == AF_INET6 && enable_v4 == 0) { 472 if (setsockopt(ctl_sock, IPPROTO_IPV6, IPV6_V6ONLY, 473 &on, sizeof (on)) < 0) 474 syslog(LOG_WARNING, 475 "control setsockopt (IPV6_V6ONLY): %m"); 476 } 477 memcpy(&server_addr, res->ai_addr, res->ai_addr->sa_len); 478 if (bind(ctl_sock, (struct sockaddr *)&server_addr, 479 server_addr.su_len) < 0) { 480 syslog(LOG_ERR, "control bind: %m"); 481 exit(1); 482 } 483 if (listen(ctl_sock, 32) < 0) { 484 syslog(LOG_ERR, "control listen: %m"); 485 exit(1); 486 } 487 /* 488 * Atomically write process ID 489 */ 490 if (pid_file) 491 { 492 int fd; 493 char buf[20]; 494 495 fd = open(pid_file, O_CREAT | O_WRONLY | O_TRUNC 496 | O_NONBLOCK | O_EXLOCK, 0644); 497 if (fd < 0) { 498 if (errno == EAGAIN) 499 errx(1, "%s: file locked", pid_file); 500 else 501 err(1, "%s", pid_file); 502 } 503 snprintf(buf, sizeof(buf), 504 "%lu\n", (unsigned long) getpid()); 505 if (write(fd, buf, strlen(buf)) < 0) 506 err(1, "%s: write", pid_file); 507 /* Leave the pid file open and locked */ 508 } 509 /* 510 * Loop forever accepting connection requests and forking off 511 * children to handle them. 512 */ 513 while (1) { 514 addrlen = server_addr.su_len; 515 fd = accept(ctl_sock, (struct sockaddr *)&his_addr, &addrlen); 516 if (fork() == 0) { 517 /* child */ 518 (void) dup2(fd, 0); 519 (void) dup2(fd, 1); 520 close(ctl_sock); 521 break; 522 } 523 close(fd); 524 } 525 } else { 526 addrlen = sizeof(his_addr); 527 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 528 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 529 exit(1); 530 } 531 } 532 533 sa.sa_handler = SIG_DFL; 534 (void)sigaction(SIGCHLD, &sa, NULL); 535 536 sa.sa_handler = sigurg; 537 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */ 538 (void)sigaction(SIGURG, &sa, NULL); 539 540 sigfillset(&sa.sa_mask); /* block all signals in handler */ 541 sa.sa_flags = SA_RESTART; 542 sa.sa_handler = sigquit; 543 (void)sigaction(SIGHUP, &sa, NULL); 544 (void)sigaction(SIGINT, &sa, NULL); 545 (void)sigaction(SIGQUIT, &sa, NULL); 546 (void)sigaction(SIGTERM, &sa, NULL); 547 548 sa.sa_handler = lostconn; 549 (void)sigaction(SIGPIPE, &sa, NULL); 550 551 addrlen = sizeof(ctrl_addr); 552 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 553 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 554 exit(1); 555 } 556 #ifdef VIRTUAL_HOSTING 557 /* select our identity from virtual host table */ 558 selecthost(&ctrl_addr); 559 #endif 560 #ifdef IP_TOS 561 if (ctrl_addr.su_family == AF_INET) 562 { 563 tos = IPTOS_LOWDELAY; 564 if (setsockopt(0, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 565 syslog(LOG_WARNING, "control setsockopt (IP_TOS): %m"); 566 } 567 #endif 568 /* 569 * Disable Nagle on the control channel so that we don't have to wait 570 * for peer's ACK before issuing our next reply. 571 */ 572 if (setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0) 573 syslog(LOG_WARNING, "control setsockopt (TCP_NODELAY): %m"); 574 575 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 576 577 /* set this here so klogin can use it... */ 578 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 579 580 /* Try to handle urgent data inline */ 581 #ifdef SO_OOBINLINE 582 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0) 583 syslog(LOG_WARNING, "control setsockopt (SO_OOBINLINE): %m"); 584 #endif 585 586 #ifdef F_SETOWN 587 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 588 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 589 #endif 590 dolog((struct sockaddr *)&his_addr); 591 /* 592 * Set up default state 593 */ 594 data = -1; 595 type = TYPE_A; 596 form = FORM_N; 597 stru = STRU_F; 598 mode = MODE_S; 599 tmpline[0] = '\0'; 600 601 /* If logins are disabled, print out the message. */ 602 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 603 while (fgets(line, sizeof(line), fd) != NULL) { 604 if ((cp = strchr(line, '\n')) != NULL) 605 *cp = '\0'; 606 lreply(530, "%s", line); 607 } 608 (void) fflush(stdout); 609 (void) fclose(fd); 610 reply(530, "System not available."); 611 exit(0); 612 } 613 #ifdef VIRTUAL_HOSTING 614 if ((fd = fopen(thishost->welcome, "r")) != NULL) { 615 #else 616 if ((fd = fopen(_PATH_FTPWELCOME, "r")) != NULL) { 617 #endif 618 while (fgets(line, sizeof(line), fd) != NULL) { 619 if ((cp = strchr(line, '\n')) != NULL) 620 *cp = '\0'; 621 lreply(220, "%s", line); 622 } 623 (void) fflush(stdout); 624 (void) fclose(fd); 625 /* reply(220,) must follow */ 626 } 627 #ifndef VIRTUAL_HOSTING 628 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 629 fatalerror("Ran out of memory."); 630 (void) gethostname(hostname, MAXHOSTNAMELEN - 1); 631 hostname[MAXHOSTNAMELEN - 1] = '\0'; 632 #endif 633 reply(220, "%s FTP server (%s) ready.", hostname, version); 634 for (;;) 635 (void) yyparse(); 636 /* NOTREACHED */ 637 } 638 639 static void 640 lostconn(int signo) 641 { 642 643 if (ftpdebug) 644 syslog(LOG_DEBUG, "lost connection"); 645 dologout(1); 646 } 647 648 static void 649 sigquit(int signo) 650 { 651 652 syslog(LOG_ERR, "got signal %d", signo); 653 dologout(1); 654 } 655 656 #ifdef VIRTUAL_HOSTING 657 /* 658 * read in virtual host tables (if they exist) 659 */ 660 661 static void 662 inithosts(void) 663 { 664 int insert; 665 size_t len; 666 FILE *fp; 667 char *cp, *mp, *line; 668 char *hostname; 669 char *vhost, *anonuser, *statfile, *welcome, *loginmsg; 670 struct ftphost *hrp, *lhrp; 671 struct addrinfo hints, *res, *ai; 672 673 /* 674 * Fill in the default host information 675 */ 676 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 677 fatalerror("Ran out of memory."); 678 if (gethostname(hostname, MAXHOSTNAMELEN) < 0) 679 hostname[0] = '\0'; 680 hostname[MAXHOSTNAMELEN - 1] = '\0'; 681 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 682 fatalerror("Ran out of memory."); 683 hrp->hostname = hostname; 684 hrp->hostinfo = NULL; 685 686 memset(&hints, 0, sizeof(hints)); 687 hints.ai_flags = AI_CANONNAME; 688 hints.ai_family = AF_UNSPEC; 689 if (getaddrinfo(hrp->hostname, NULL, &hints, &res) == 0) 690 hrp->hostinfo = res; 691 hrp->statfile = _PATH_FTPDSTATFILE; 692 hrp->welcome = _PATH_FTPWELCOME; 693 hrp->loginmsg = _PATH_FTPLOGINMESG; 694 hrp->anonuser = "ftp"; 695 hrp->next = NULL; 696 thishost = firsthost = lhrp = hrp; 697 if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) { 698 int addrsize, gothost; 699 void *addr; 700 struct hostent *hp; 701 702 while ((line = fgetln(fp, &len)) != NULL) { 703 int i, hp_error; 704 705 /* skip comments */ 706 if (line[0] == '#') 707 continue; 708 if (line[len - 1] == '\n') { 709 line[len - 1] = '\0'; 710 mp = NULL; 711 } else { 712 if ((mp = malloc(len + 1)) == NULL) 713 fatalerror("Ran out of memory."); 714 memcpy(mp, line, len); 715 mp[len] = '\0'; 716 line = mp; 717 } 718 cp = strtok(line, " \t"); 719 /* skip empty lines */ 720 if (cp == NULL) 721 goto nextline; 722 vhost = cp; 723 724 /* set defaults */ 725 anonuser = "ftp"; 726 statfile = _PATH_FTPDSTATFILE; 727 welcome = _PATH_FTPWELCOME; 728 loginmsg = _PATH_FTPLOGINMESG; 729 730 /* 731 * Preparse the line so we can use its info 732 * for all the addresses associated with 733 * the virtual host name. 734 * Field 0, the virtual host name, is special: 735 * it's already parsed off and will be strdup'ed 736 * later, after we know its canonical form. 737 */ 738 for (i = 1; i < 5 && (cp = strtok(NULL, " \t")); i++) 739 if (*cp != '-' && (cp = strdup(cp))) 740 switch (i) { 741 case 1: /* anon user permissions */ 742 anonuser = cp; 743 break; 744 case 2: /* statistics file */ 745 statfile = cp; 746 break; 747 case 3: /* welcome message */ 748 welcome = cp; 749 break; 750 case 4: /* login message */ 751 loginmsg = cp; 752 break; 753 default: /* programming error */ 754 abort(); 755 /* NOTREACHED */ 756 } 757 758 hints.ai_flags = 0; 759 hints.ai_family = AF_UNSPEC; 760 hints.ai_flags = AI_PASSIVE; 761 if (getaddrinfo(vhost, NULL, &hints, &res) != 0) 762 goto nextline; 763 for (ai = res; ai != NULL && ai->ai_addr != NULL; 764 ai = ai->ai_next) { 765 766 gothost = 0; 767 for (hrp = firsthost; hrp != NULL; hrp = hrp->next) { 768 struct addrinfo *hi; 769 770 for (hi = hrp->hostinfo; hi != NULL; 771 hi = hi->ai_next) 772 if (hi->ai_addrlen == ai->ai_addrlen && 773 memcmp(hi->ai_addr, 774 ai->ai_addr, 775 ai->ai_addr->sa_len) == 0) { 776 gothost++; 777 break; 778 } 779 if (gothost) 780 break; 781 } 782 if (hrp == NULL) { 783 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 784 goto nextline; 785 hrp->hostname = NULL; 786 insert = 1; 787 } else { 788 if (hrp->hostinfo) 789 freeaddrinfo(hrp->hostinfo); 790 insert = 0; /* host already in the chain */ 791 } 792 hrp->hostinfo = res; 793 794 /* 795 * determine hostname to use. 796 * force defined name if there is a valid alias 797 * otherwise fallback to primary hostname 798 */ 799 /* XXX: getaddrinfo() can't do alias check */ 800 switch(hrp->hostinfo->ai_family) { 801 case AF_INET: 802 addr = &((struct sockaddr_in *)hrp->hostinfo->ai_addr)->sin_addr; 803 addrsize = sizeof(struct in_addr); 804 break; 805 case AF_INET6: 806 addr = &((struct sockaddr_in6 *)hrp->hostinfo->ai_addr)->sin6_addr; 807 addrsize = sizeof(struct in6_addr); 808 break; 809 default: 810 /* should not reach here */ 811 freeaddrinfo(hrp->hostinfo); 812 if (insert) 813 free(hrp); /*not in chain, can free*/ 814 else 815 hrp->hostinfo = NULL; /*mark as blank*/ 816 goto nextline; 817 /* NOTREACHED */ 818 } 819 if ((hp = getipnodebyaddr(addr, addrsize, 820 hrp->hostinfo->ai_family, 821 &hp_error)) != NULL) { 822 if (strcmp(vhost, hp->h_name) != 0) { 823 if (hp->h_aliases == NULL) 824 vhost = hp->h_name; 825 else { 826 i = 0; 827 while (hp->h_aliases[i] && 828 strcmp(vhost, hp->h_aliases[i]) != 0) 829 ++i; 830 if (hp->h_aliases[i] == NULL) 831 vhost = hp->h_name; 832 } 833 } 834 } 835 if (hrp->hostname && 836 strcmp(hrp->hostname, vhost) != 0) { 837 free(hrp->hostname); 838 hrp->hostname = NULL; 839 } 840 if (hrp->hostname == NULL && 841 (hrp->hostname = strdup(vhost)) == NULL) { 842 freeaddrinfo(hrp->hostinfo); 843 hrp->hostinfo = NULL; /* mark as blank */ 844 if (hp) 845 freehostent(hp); 846 goto nextline; 847 } 848 hrp->anonuser = anonuser; 849 hrp->statfile = statfile; 850 hrp->welcome = welcome; 851 hrp->loginmsg = loginmsg; 852 if (insert) { 853 hrp->next = NULL; 854 lhrp->next = hrp; 855 lhrp = hrp; 856 } 857 if (hp) 858 freehostent(hp); 859 } 860 nextline: 861 if (mp) 862 free(mp); 863 } 864 (void) fclose(fp); 865 } 866 } 867 868 static void 869 selecthost(union sockunion *su) 870 { 871 struct ftphost *hrp; 872 u_int16_t port; 873 #ifdef INET6 874 struct in6_addr *mapped_in6 = NULL; 875 #endif 876 struct addrinfo *hi; 877 878 #ifdef INET6 879 /* 880 * XXX IPv4 mapped IPv6 addr consideraton, 881 * specified in rfc2373. 882 */ 883 if (su->su_family == AF_INET6 && 884 IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr)) 885 mapped_in6 = &su->su_sin6.sin6_addr; 886 #endif 887 888 hrp = thishost = firsthost; /* default */ 889 port = su->su_port; 890 su->su_port = 0; 891 while (hrp != NULL) { 892 for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) { 893 if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) { 894 thishost = hrp; 895 break; 896 } 897 #ifdef INET6 898 /* XXX IPv4 mapped IPv6 addr consideraton */ 899 if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL && 900 (memcmp(&mapped_in6->s6_addr[12], 901 &((struct sockaddr_in *)hi->ai_addr)->sin_addr, 902 sizeof(struct in_addr)) == 0)) { 903 thishost = hrp; 904 break; 905 } 906 #endif 907 } 908 hrp = hrp->next; 909 } 910 su->su_port = port; 911 /* setup static variables as appropriate */ 912 hostname = thishost->hostname; 913 ftpuser = thishost->anonuser; 914 } 915 #endif 916 917 /* 918 * Helper function for sgetpwnam(). 919 */ 920 static char * 921 sgetsave(char *s) 922 { 923 char *new = malloc((unsigned) strlen(s) + 1); 924 925 if (new == NULL) { 926 perror_reply(421, "Local resource failure: malloc"); 927 dologout(1); 928 /* NOTREACHED */ 929 } 930 (void) strcpy(new, s); 931 return (new); 932 } 933 934 /* 935 * Save the result of a getpwnam. Used for USER command, since 936 * the data returned must not be clobbered by any other command 937 * (e.g., globbing). 938 */ 939 static struct passwd * 940 sgetpwnam(char *name) 941 { 942 static struct passwd save; 943 struct passwd *p; 944 945 if ((p = getpwnam(name)) == NULL) 946 return (p); 947 if (save.pw_name) { 948 free(save.pw_name); 949 free(save.pw_passwd); 950 free(save.pw_gecos); 951 free(save.pw_dir); 952 free(save.pw_shell); 953 } 954 save = *p; 955 save.pw_name = sgetsave(p->pw_name); 956 save.pw_passwd = sgetsave(p->pw_passwd); 957 save.pw_gecos = sgetsave(p->pw_gecos); 958 save.pw_dir = sgetsave(p->pw_dir); 959 save.pw_shell = sgetsave(p->pw_shell); 960 return (&save); 961 } 962 963 static int login_attempts; /* number of failed login attempts */ 964 static int askpasswd; /* had user command, ask for passwd */ 965 static char curname[MAXLOGNAME]; /* current USER name */ 966 967 /* 968 * USER command. 969 * Sets global passwd pointer pw if named account exists and is acceptable; 970 * sets askpasswd if a PASS command is expected. If logged in previously, 971 * need to reset state. If name is "ftp" or "anonymous", the name is not in 972 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 973 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 974 * requesting login privileges. Disallow anyone who does not have a standard 975 * shell as returned by getusershell(). Disallow anyone mentioned in the file 976 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 977 */ 978 void 979 user(char *name) 980 { 981 char *cp, *shell; 982 983 if (logged_in) { 984 if (guest) { 985 reply(530, "Can't change user from guest login."); 986 return; 987 } else if (dochroot) { 988 reply(530, "Can't change user from chroot user."); 989 return; 990 } 991 end_login(); 992 } 993 994 guest = 0; 995 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 996 if (checkuser(_PATH_FTPUSERS, "ftp", 0) || 997 checkuser(_PATH_FTPUSERS, "anonymous", 0)) 998 reply(530, "User %s access denied.", name); 999 #ifdef VIRTUAL_HOSTING 1000 else if ((pw = sgetpwnam(thishost->anonuser)) != NULL) { 1001 #else 1002 else if ((pw = sgetpwnam("ftp")) != NULL) { 1003 #endif 1004 guest = 1; 1005 askpasswd = 1; 1006 reply(331, 1007 "Guest login ok, send your email address as password."); 1008 } else 1009 reply(530, "User %s unknown.", name); 1010 if (!askpasswd && logging) 1011 syslog(LOG_NOTICE, 1012 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 1013 return; 1014 } 1015 if (anon_only != 0) { 1016 reply(530, "Sorry, only anonymous ftp allowed."); 1017 return; 1018 } 1019 1020 if ((pw = sgetpwnam(name))) { 1021 if ((shell = pw->pw_shell) == NULL || *shell == 0) 1022 shell = _PATH_BSHELL; 1023 while ((cp = getusershell()) != NULL) 1024 if (strcmp(cp, shell) == 0) 1025 break; 1026 endusershell(); 1027 1028 if (cp == NULL || checkuser(_PATH_FTPUSERS, name, 1)) { 1029 reply(530, "User %s access denied.", name); 1030 if (logging) 1031 syslog(LOG_NOTICE, 1032 "FTP LOGIN REFUSED FROM %s, %s", 1033 remotehost, name); 1034 pw = (struct passwd *) NULL; 1035 return; 1036 } 1037 } 1038 if (logging) 1039 strncpy(curname, name, sizeof(curname)-1); 1040 1041 pwok = 0; 1042 #ifdef USE_PAM 1043 /* XXX Kluge! The conversation mechanism needs to be fixed. */ 1044 #endif 1045 if (opiechallenge(&opiedata, name, opieprompt) == 0) { 1046 pwok = (pw != NULL) && 1047 opieaccessfile(remotehost) && 1048 opiealways(pw->pw_dir); 1049 reply(331, "Response to %s %s for %s.", 1050 opieprompt, pwok ? "requested" : "required", name); 1051 } else { 1052 pwok = 1; 1053 reply(331, "Password required for %s.", name); 1054 } 1055 askpasswd = 1; 1056 /* 1057 * Delay before reading passwd after first failed 1058 * attempt to slow down passwd-guessing programs. 1059 */ 1060 if (login_attempts) 1061 sleep((unsigned) login_attempts); 1062 } 1063 1064 /* 1065 * Check if a user is in the file "fname" 1066 */ 1067 static int 1068 checkuser(char *fname, char *name, int pwset) 1069 { 1070 FILE *fd; 1071 int found = 0; 1072 size_t len; 1073 char *line, *mp, *p; 1074 1075 if ((fd = fopen(fname, "r")) != NULL) { 1076 while (!found && (line = fgetln(fd, &len)) != NULL) { 1077 /* skip comments */ 1078 if (line[0] == '#') 1079 continue; 1080 if (line[len - 1] == '\n') { 1081 line[len - 1] = '\0'; 1082 mp = NULL; 1083 } else { 1084 if ((mp = malloc(len + 1)) == NULL) 1085 fatalerror("Ran out of memory."); 1086 memcpy(mp, line, len); 1087 mp[len] = '\0'; 1088 line = mp; 1089 } 1090 /* avoid possible leading and trailing whitespace */ 1091 p = strtok(line, " \t"); 1092 /* skip empty lines */ 1093 if (p == NULL) 1094 goto nextline; 1095 /* 1096 * if first chr is '@', check group membership 1097 */ 1098 if (p[0] == '@') { 1099 int i = 0; 1100 struct group *grp; 1101 1102 if ((grp = getgrnam(p+1)) == NULL) 1103 goto nextline; 1104 /* 1105 * Check user's default group 1106 */ 1107 if (pwset && grp->gr_gid == pw->pw_gid) 1108 found = 1; 1109 /* 1110 * Check supplementary groups 1111 */ 1112 while (!found && grp->gr_mem[i]) 1113 found = strcmp(name, 1114 grp->gr_mem[i++]) 1115 == 0; 1116 } 1117 /* 1118 * Otherwise, just check for username match 1119 */ 1120 else 1121 found = strcmp(p, name) == 0; 1122 nextline: 1123 if (mp) 1124 free(mp); 1125 } 1126 (void) fclose(fd); 1127 } 1128 return (found); 1129 } 1130 1131 /* 1132 * Terminate login as previous user, if any, resetting state; 1133 * used when USER command is given or login fails. 1134 */ 1135 static void 1136 end_login(void) 1137 { 1138 #ifdef USE_PAM 1139 int e; 1140 #endif 1141 1142 (void) seteuid((uid_t)0); 1143 if (logged_in && dowtmp) 1144 ftpd_logwtmp(ttyline, "", NULL); 1145 pw = NULL; 1146 #ifdef LOGIN_CAP 1147 setusercontext(NULL, getpwuid(0), (uid_t)0, 1148 LOGIN_SETPRIORITY|LOGIN_SETRESOURCES|LOGIN_SETUMASK); 1149 #endif 1150 #ifdef USE_PAM 1151 if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) 1152 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1153 if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS) 1154 syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e)); 1155 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) 1156 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1157 pamh = NULL; 1158 #endif 1159 logged_in = 0; 1160 guest = 0; 1161 dochroot = 0; 1162 } 1163 1164 #ifdef USE_PAM 1165 1166 /* 1167 * the following code is stolen from imap-uw PAM authentication module and 1168 * login.c 1169 */ 1170 #define COPY_STRING(s) (s ? strdup(s) : NULL) 1171 1172 struct cred_t { 1173 const char *uname; /* user name */ 1174 const char *pass; /* password */ 1175 }; 1176 typedef struct cred_t cred_t; 1177 1178 static int 1179 auth_conv(int num_msg, const struct pam_message **msg, 1180 struct pam_response **resp, void *appdata) 1181 { 1182 int i; 1183 cred_t *cred = (cred_t *) appdata; 1184 struct pam_response *reply; 1185 1186 reply = calloc(num_msg, sizeof *reply); 1187 if (reply == NULL) 1188 return PAM_BUF_ERR; 1189 1190 for (i = 0; i < num_msg; i++) { 1191 switch (msg[i]->msg_style) { 1192 case PAM_PROMPT_ECHO_ON: /* assume want user name */ 1193 reply[i].resp_retcode = PAM_SUCCESS; 1194 reply[i].resp = COPY_STRING(cred->uname); 1195 /* PAM frees resp. */ 1196 break; 1197 case PAM_PROMPT_ECHO_OFF: /* assume want password */ 1198 reply[i].resp_retcode = PAM_SUCCESS; 1199 reply[i].resp = COPY_STRING(cred->pass); 1200 /* PAM frees resp. */ 1201 break; 1202 case PAM_TEXT_INFO: 1203 case PAM_ERROR_MSG: 1204 reply[i].resp_retcode = PAM_SUCCESS; 1205 reply[i].resp = NULL; 1206 break; 1207 default: /* unknown message style */ 1208 free(reply); 1209 return PAM_CONV_ERR; 1210 } 1211 } 1212 1213 *resp = reply; 1214 return PAM_SUCCESS; 1215 } 1216 1217 /* 1218 * Attempt to authenticate the user using PAM. Returns 0 if the user is 1219 * authenticated, or 1 if not authenticated. If some sort of PAM system 1220 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this 1221 * function returns -1. This can be used as an indication that we should 1222 * fall back to a different authentication mechanism. 1223 */ 1224 static int 1225 auth_pam(struct passwd **ppw, const char *pass) 1226 { 1227 pam_handle_t *pamh = NULL; 1228 const char *tmpl_user; 1229 const void *item; 1230 int rval; 1231 int e; 1232 cred_t auth_cred = { (*ppw)->pw_name, pass }; 1233 struct pam_conv conv = { &auth_conv, &auth_cred }; 1234 1235 e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh); 1236 if (e != PAM_SUCCESS) { 1237 syslog(LOG_ERR, "pam_start: %s", pam_strerror(pamh, e)); 1238 return -1; 1239 } 1240 1241 e = pam_set_item(pamh, PAM_RHOST, remotehost); 1242 if (e != PAM_SUCCESS) { 1243 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s", 1244 pam_strerror(pamh, e)); 1245 return -1; 1246 } 1247 1248 e = pam_authenticate(pamh, 0); 1249 switch (e) { 1250 case PAM_SUCCESS: 1251 /* 1252 * With PAM we support the concept of a "template" 1253 * user. The user enters a login name which is 1254 * authenticated by PAM, usually via a remote service 1255 * such as RADIUS or TACACS+. If authentication 1256 * succeeds, a different but related "template" name 1257 * is used for setting the credentials, shell, and 1258 * home directory. The name the user enters need only 1259 * exist on the remote authentication server, but the 1260 * template name must be present in the local password 1261 * database. 1262 * 1263 * This is supported by two various mechanisms in the 1264 * individual modules. However, from the application's 1265 * point of view, the template user is always passed 1266 * back as a changed value of the PAM_USER item. 1267 */ 1268 if ((e = pam_get_item(pamh, PAM_USER, &item)) == 1269 PAM_SUCCESS) { 1270 tmpl_user = (const char *) item; 1271 if (strcmp((*ppw)->pw_name, tmpl_user) != 0) 1272 *ppw = getpwnam(tmpl_user); 1273 } else 1274 syslog(LOG_ERR, "Couldn't get PAM_USER: %s", 1275 pam_strerror(pamh, e)); 1276 rval = 0; 1277 break; 1278 1279 case PAM_AUTH_ERR: 1280 case PAM_USER_UNKNOWN: 1281 case PAM_MAXTRIES: 1282 rval = 1; 1283 break; 1284 1285 default: 1286 syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e)); 1287 rval = -1; 1288 break; 1289 } 1290 1291 if (rval == 0) { 1292 e = pam_acct_mgmt(pamh, 0); 1293 if (e == PAM_NEW_AUTHTOK_REQD) { 1294 e = pam_chauthtok(pamh, PAM_CHANGE_EXPIRED_AUTHTOK); 1295 if (e != PAM_SUCCESS) { 1296 syslog(LOG_ERR, "pam_chauthtok: %s", pam_strerror(pamh, e)); 1297 rval = 1; 1298 } 1299 } else if (e != PAM_SUCCESS) { 1300 rval = 1; 1301 } 1302 } 1303 1304 if (rval != 0) { 1305 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1306 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1307 } 1308 pamh = NULL; 1309 } 1310 return rval; 1311 } 1312 1313 #endif /* USE_PAM */ 1314 1315 void 1316 pass(char *passwd) 1317 { 1318 int rval; 1319 FILE *fd; 1320 #ifdef LOGIN_CAP 1321 login_cap_t *lc = NULL; 1322 #endif 1323 #ifdef USE_PAM 1324 int e; 1325 #endif 1326 char *xpasswd; 1327 1328 if (logged_in || askpasswd == 0) { 1329 reply(503, "Login with USER first."); 1330 return; 1331 } 1332 askpasswd = 0; 1333 if (!guest) { /* "ftp" is only account allowed no password */ 1334 if (pw == NULL) { 1335 rval = 1; /* failure below */ 1336 goto skip; 1337 } 1338 #ifdef USE_PAM 1339 rval = auth_pam(&pw, passwd); 1340 if (rval >= 0) { 1341 opieunlock(); 1342 goto skip; 1343 } 1344 #endif 1345 if (opieverify(&opiedata, passwd) == 0) 1346 xpasswd = pw->pw_passwd; 1347 else if (pwok) { 1348 xpasswd = crypt(passwd, pw->pw_passwd); 1349 if (passwd[0] == '\0' && pw->pw_passwd[0] != '\0') 1350 xpasswd = ":"; 1351 } else { 1352 rval = 1; 1353 goto skip; 1354 } 1355 rval = strcmp(pw->pw_passwd, xpasswd); 1356 if (pw->pw_expire && time(NULL) >= pw->pw_expire) 1357 rval = 1; /* failure */ 1358 skip: 1359 /* 1360 * If rval == 1, the user failed the authentication check 1361 * above. If rval == 0, either PAM or local authentication 1362 * succeeded. 1363 */ 1364 if (rval) { 1365 reply(530, "Login incorrect."); 1366 if (logging) 1367 syslog(LOG_NOTICE, 1368 "FTP LOGIN FAILED FROM %s, %s", 1369 remotehost, curname); 1370 pw = NULL; 1371 if (login_attempts++ >= 5) { 1372 syslog(LOG_NOTICE, 1373 "repeated login failures from %s", 1374 remotehost); 1375 exit(0); 1376 } 1377 return; 1378 } 1379 } 1380 login_attempts = 0; /* this time successful */ 1381 if (setegid((gid_t)pw->pw_gid) < 0) { 1382 reply(550, "Can't set gid."); 1383 return; 1384 } 1385 /* May be overridden by login.conf */ 1386 (void) umask(defumask); 1387 #ifdef LOGIN_CAP 1388 if ((lc = login_getpwclass(pw)) != NULL) { 1389 char remote_ip[MAXHOSTNAMELEN]; 1390 1391 getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1392 remote_ip, sizeof(remote_ip) - 1, NULL, 0, 1393 NI_NUMERICHOST); 1394 remote_ip[sizeof(remote_ip) - 1] = 0; 1395 if (!auth_hostok(lc, remotehost, remote_ip)) { 1396 syslog(LOG_INFO|LOG_AUTH, 1397 "FTP LOGIN FAILED (HOST) as %s: permission denied.", 1398 pw->pw_name); 1399 reply(530, "Permission denied.\n"); 1400 pw = NULL; 1401 return; 1402 } 1403 if (!auth_timeok(lc, time(NULL))) { 1404 reply(530, "Login not available right now.\n"); 1405 pw = NULL; 1406 return; 1407 } 1408 } 1409 setusercontext(lc, pw, (uid_t)0, 1410 LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY| 1411 LOGIN_SETRESOURCES|LOGIN_SETUMASK); 1412 #else 1413 setlogin(pw->pw_name); 1414 (void) initgroups(pw->pw_name, pw->pw_gid); 1415 #endif 1416 1417 #ifdef USE_PAM 1418 if (pamh) { 1419 if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) { 1420 syslog(LOG_ERR, "pam_open_session: %s", pam_strerror(pamh, e)); 1421 } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS) { 1422 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1423 } 1424 } 1425 #endif 1426 1427 /* open wtmp before chroot */ 1428 if (dowtmp) 1429 ftpd_logwtmp(ttyline, pw->pw_name, 1430 (struct sockaddr *)&his_addr); 1431 logged_in = 1; 1432 1433 if (guest && stats && statfd < 0) 1434 #ifdef VIRTUAL_HOSTING 1435 if ((statfd = open(thishost->statfile, O_WRONLY|O_APPEND)) < 0) 1436 #else 1437 if ((statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND)) < 0) 1438 #endif 1439 stats = 0; 1440 1441 dochroot = 1442 #ifdef LOGIN_CAP /* Allow login.conf configuration as well */ 1443 login_getcapbool(lc, "ftp-chroot", 0) || 1444 #endif 1445 checkuser(_PATH_FTPCHROOT, pw->pw_name, 1); 1446 if (guest) { 1447 /* 1448 * We MUST do a chdir() after the chroot. Otherwise 1449 * the old current directory will be accessible as "." 1450 * outside the new root! 1451 */ 1452 if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) { 1453 reply(550, "Can't set guest privileges."); 1454 goto bad; 1455 } 1456 } else if (dochroot) { 1457 if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) { 1458 reply(550, "Can't change root."); 1459 goto bad; 1460 } 1461 } else if (chdir(pw->pw_dir) < 0) { 1462 if (chdir("/") < 0) { 1463 reply(530, "User %s: can't change directory to %s.", 1464 pw->pw_name, pw->pw_dir); 1465 goto bad; 1466 } else 1467 lreply(230, "No directory! Logging in with home=/"); 1468 } 1469 if (seteuid((uid_t)pw->pw_uid) < 0) { 1470 reply(550, "Can't set uid."); 1471 goto bad; 1472 } 1473 1474 /* 1475 * Display a login message, if it exists. 1476 * N.B. reply(230,) must follow the message. 1477 */ 1478 #ifdef VIRTUAL_HOSTING 1479 if ((fd = fopen(thishost->loginmsg, "r")) != NULL) { 1480 #else 1481 if ((fd = fopen(_PATH_FTPLOGINMESG, "r")) != NULL) { 1482 #endif 1483 char *cp, line[LINE_MAX]; 1484 1485 while (fgets(line, sizeof(line), fd) != NULL) { 1486 if ((cp = strchr(line, '\n')) != NULL) 1487 *cp = '\0'; 1488 lreply(230, "%s", line); 1489 } 1490 (void) fflush(stdout); 1491 (void) fclose(fd); 1492 } 1493 if (guest) { 1494 if (ident != NULL) 1495 free(ident); 1496 ident = strdup(passwd); 1497 if (ident == NULL) 1498 fatalerror("Ran out of memory."); 1499 1500 reply(230, "Guest login ok, access restrictions apply."); 1501 #ifdef SETPROCTITLE 1502 #ifdef VIRTUAL_HOSTING 1503 if (thishost != firsthost) 1504 snprintf(proctitle, sizeof(proctitle), 1505 "%s: anonymous(%s)/%s", remotehost, hostname, 1506 passwd); 1507 else 1508 #endif 1509 snprintf(proctitle, sizeof(proctitle), 1510 "%s: anonymous/%s", remotehost, passwd); 1511 setproctitle("%s", proctitle); 1512 #endif /* SETPROCTITLE */ 1513 if (logging) 1514 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1515 remotehost, passwd); 1516 } else { 1517 if (dochroot) 1518 reply(230, "User %s logged in, " 1519 "access restrictions apply.", pw->pw_name); 1520 else 1521 reply(230, "User %s logged in.", pw->pw_name); 1522 1523 #ifdef SETPROCTITLE 1524 snprintf(proctitle, sizeof(proctitle), 1525 "%s: user/%s", remotehost, pw->pw_name); 1526 setproctitle("%s", proctitle); 1527 #endif /* SETPROCTITLE */ 1528 if (logging) 1529 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1530 remotehost, pw->pw_name); 1531 } 1532 #ifdef LOGIN_CAP 1533 login_close(lc); 1534 #endif 1535 return; 1536 bad: 1537 /* Forget all about it... */ 1538 #ifdef LOGIN_CAP 1539 login_close(lc); 1540 #endif 1541 end_login(); 1542 } 1543 1544 void 1545 retrieve(char *cmd, char *name) 1546 { 1547 FILE *fin, *dout; 1548 struct stat st; 1549 int (*closefunc)(FILE *); 1550 time_t start; 1551 1552 if (cmd == 0) { 1553 fin = fopen(name, "r"), closefunc = fclose; 1554 st.st_size = 0; 1555 } else { 1556 char line[BUFSIZ]; 1557 1558 (void) snprintf(line, sizeof(line), cmd, name), name = line; 1559 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1560 st.st_size = -1; 1561 st.st_blksize = BUFSIZ; 1562 } 1563 if (fin == NULL) { 1564 if (errno != 0) { 1565 perror_reply(550, name); 1566 if (cmd == 0) { 1567 LOGCMD("get", name); 1568 } 1569 } 1570 return; 1571 } 1572 byte_count = -1; 1573 if (cmd == 0 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1574 reply(550, "%s: not a plain file.", name); 1575 goto done; 1576 } 1577 if (restart_point) { 1578 if (type == TYPE_A) { 1579 off_t i, n; 1580 int c; 1581 1582 n = restart_point; 1583 i = 0; 1584 while (i++ < n) { 1585 if ((c=getc(fin)) == EOF) { 1586 perror_reply(550, name); 1587 goto done; 1588 } 1589 if (c == '\n') 1590 i++; 1591 } 1592 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 1593 perror_reply(550, name); 1594 goto done; 1595 } 1596 } 1597 dout = dataconn(name, st.st_size, "w"); 1598 if (dout == NULL) 1599 goto done; 1600 time(&start); 1601 send_data(fin, dout, st.st_blksize, st.st_size, 1602 restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode)); 1603 if (cmd == 0 && guest && stats) 1604 logxfer(name, st.st_size, start); 1605 (void) fclose(dout); 1606 data = -1; 1607 pdata = -1; 1608 done: 1609 if (cmd == 0) 1610 LOGBYTES("get", name, byte_count); 1611 (*closefunc)(fin); 1612 } 1613 1614 void 1615 store(char *name, char *mode, int unique) 1616 { 1617 int fd; 1618 FILE *fout, *din; 1619 int (*closefunc)(FILE *); 1620 1621 if (*mode == 'a') { /* APPE */ 1622 if (unique) { 1623 /* Programming error */ 1624 syslog(LOG_ERR, "Internal: unique flag to APPE"); 1625 unique = 0; 1626 } 1627 if (guest && noguestmod) { 1628 reply(550, "Appending to existing file denied"); 1629 goto err; 1630 } 1631 restart_point = 0; /* not affected by preceding REST */ 1632 } 1633 if (unique) /* STOU overrides REST */ 1634 restart_point = 0; 1635 if (guest && noguestmod) { 1636 if (restart_point) { /* guest STOR w/REST */ 1637 reply(550, "Modifying existing file denied"); 1638 goto err; 1639 } else /* treat guest STOR as STOU */ 1640 unique = 1; 1641 } 1642 1643 if (restart_point) 1644 mode = "r+"; /* so ASCII manual seek can work */ 1645 if (unique) { 1646 if ((fd = guniquefd(name, &name)) < 0) 1647 goto err; 1648 fout = fdopen(fd, mode); 1649 } else 1650 fout = fopen(name, mode); 1651 closefunc = fclose; 1652 if (fout == NULL) { 1653 perror_reply(553, name); 1654 goto err; 1655 } 1656 byte_count = -1; 1657 if (restart_point) { 1658 if (type == TYPE_A) { 1659 off_t i, n; 1660 int c; 1661 1662 n = restart_point; 1663 i = 0; 1664 while (i++ < n) { 1665 if ((c=getc(fout)) == EOF) { 1666 perror_reply(550, name); 1667 goto done; 1668 } 1669 if (c == '\n') 1670 i++; 1671 } 1672 /* 1673 * We must do this seek to "current" position 1674 * because we are changing from reading to 1675 * writing. 1676 */ 1677 if (fseeko(fout, (off_t)0, SEEK_CUR) < 0) { 1678 perror_reply(550, name); 1679 goto done; 1680 } 1681 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 1682 perror_reply(550, name); 1683 goto done; 1684 } 1685 } 1686 din = dataconn(name, (off_t)-1, "r"); 1687 if (din == NULL) 1688 goto done; 1689 if (receive_data(din, fout) == 0) { 1690 if (unique) 1691 reply(226, "Transfer complete (unique file name:%s).", 1692 name); 1693 else 1694 reply(226, "Transfer complete."); 1695 } 1696 (void) fclose(din); 1697 data = -1; 1698 pdata = -1; 1699 done: 1700 LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count); 1701 (*closefunc)(fout); 1702 return; 1703 err: 1704 LOGCMD(*mode == 'a' ? "append" : "put" , name); 1705 return; 1706 } 1707 1708 static FILE * 1709 getdatasock(char *mode) 1710 { 1711 int on = 1, s, t, tries; 1712 1713 if (data >= 0) 1714 return (fdopen(data, mode)); 1715 (void) seteuid((uid_t)0); 1716 1717 s = socket(data_dest.su_family, SOCK_STREAM, 0); 1718 if (s < 0) 1719 goto bad; 1720 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 1721 syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m"); 1722 /* anchor socket to avoid multi-homing problems */ 1723 data_source = ctrl_addr; 1724 data_source.su_port = htons(20); /* ftp-data port */ 1725 for (tries = 1; ; tries++) { 1726 if (bind(s, (struct sockaddr *)&data_source, 1727 data_source.su_len) >= 0) 1728 break; 1729 if (errno != EADDRINUSE || tries > 10) 1730 goto bad; 1731 sleep(tries); 1732 } 1733 (void) seteuid((uid_t)pw->pw_uid); 1734 #ifdef IP_TOS 1735 if (data_source.su_family == AF_INET) 1736 { 1737 on = IPTOS_THROUGHPUT; 1738 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0) 1739 syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m"); 1740 } 1741 #endif 1742 #ifdef TCP_NOPUSH 1743 /* 1744 * Turn off push flag to keep sender TCP from sending short packets 1745 * at the boundaries of each write(). Should probably do a SO_SNDBUF 1746 * to set the send buffer size as well, but that may not be desirable 1747 * in heavy-load situations. 1748 */ 1749 on = 1; 1750 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0) 1751 syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m"); 1752 #endif 1753 #ifdef SO_SNDBUF 1754 on = 65536; 1755 if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, &on, sizeof on) < 0) 1756 syslog(LOG_WARNING, "data setsockopt (SO_SNDBUF): %m"); 1757 #endif 1758 1759 return (fdopen(s, mode)); 1760 bad: 1761 /* Return the real value of errno (close may change it) */ 1762 t = errno; 1763 (void) seteuid((uid_t)pw->pw_uid); 1764 (void) close(s); 1765 errno = t; 1766 return (NULL); 1767 } 1768 1769 static FILE * 1770 dataconn(char *name, off_t size, char *mode) 1771 { 1772 char sizebuf[32]; 1773 FILE *file; 1774 int retry = 0, tos; 1775 1776 file_size = size; 1777 byte_count = 0; 1778 if (size != (off_t) -1) 1779 (void) snprintf(sizebuf, sizeof(sizebuf), " (%qd bytes)", size); 1780 else 1781 *sizebuf = '\0'; 1782 if (pdata >= 0) { 1783 union sockunion from; 1784 int flags; 1785 int s, fromlen = ctrl_addr.su_len; 1786 struct timeval timeout; 1787 fd_set set; 1788 1789 FD_ZERO(&set); 1790 FD_SET(pdata, &set); 1791 1792 timeout.tv_usec = 0; 1793 timeout.tv_sec = 120; 1794 1795 /* 1796 * Granted a socket is in the blocking I/O mode, 1797 * accept() will block after a successful select() 1798 * if the selected connection dies in between. 1799 * Therefore set the non-blocking I/O flag here. 1800 */ 1801 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1802 fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1) 1803 goto pdata_err; 1804 if (select(pdata+1, &set, (fd_set *) 0, (fd_set *) 0, &timeout) <= 0 || 1805 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0) 1806 goto pdata_err; 1807 (void) close(pdata); 1808 pdata = s; 1809 /* 1810 * Unset the inherited non-blocking I/O flag 1811 * on the child socket so stdio can work on it. 1812 */ 1813 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1814 fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1) 1815 goto pdata_err; 1816 #ifdef IP_TOS 1817 if (from.su_family == AF_INET) 1818 { 1819 tos = IPTOS_THROUGHPUT; 1820 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 1821 syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m"); 1822 } 1823 #endif 1824 reply(150, "Opening %s mode data connection for '%s'%s.", 1825 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1826 return (fdopen(pdata, mode)); 1827 pdata_err: 1828 reply(425, "Can't open data connection."); 1829 (void) close(pdata); 1830 pdata = -1; 1831 return (NULL); 1832 } 1833 if (data >= 0) { 1834 reply(125, "Using existing data connection for '%s'%s.", 1835 name, sizebuf); 1836 usedefault = 1; 1837 return (fdopen(data, mode)); 1838 } 1839 if (usedefault) 1840 data_dest = his_addr; 1841 usedefault = 1; 1842 file = getdatasock(mode); 1843 if (file == NULL) { 1844 char hostbuf[BUFSIZ], portbuf[BUFSIZ]; 1845 getnameinfo((struct sockaddr *)&data_source, 1846 data_source.su_len, hostbuf, sizeof(hostbuf) - 1, 1847 portbuf, sizeof(portbuf), 1848 NI_NUMERICHOST|NI_NUMERICSERV); 1849 reply(425, "Can't create data socket (%s,%s): %s.", 1850 hostbuf, portbuf, strerror(errno)); 1851 return (NULL); 1852 } 1853 data = fileno(file); 1854 while (connect(data, (struct sockaddr *)&data_dest, 1855 data_dest.su_len) < 0) { 1856 if (errno == EADDRINUSE && retry < swaitmax) { 1857 sleep((unsigned) swaitint); 1858 retry += swaitint; 1859 continue; 1860 } 1861 perror_reply(425, "Can't build data connection"); 1862 (void) fclose(file); 1863 data = -1; 1864 return (NULL); 1865 } 1866 reply(150, "Opening %s mode data connection for '%s'%s.", 1867 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1868 return (file); 1869 } 1870 1871 /* 1872 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1873 * encapsulation of the data subject to Mode, Structure, and Type. 1874 * 1875 * NB: Form isn't handled. 1876 */ 1877 static int 1878 send_data(FILE *instr, FILE *outstr, off_t blksize, off_t filesize, int isreg) 1879 { 1880 int c, filefd, netfd; 1881 char *buf; 1882 off_t cnt; 1883 1884 transflag++; 1885 switch (type) { 1886 1887 case TYPE_A: 1888 while ((c = getc(instr)) != EOF) { 1889 if (recvurg) 1890 goto got_oob; 1891 byte_count++; 1892 if (c == '\n') { 1893 if (ferror(outstr)) 1894 goto data_err; 1895 (void) putc('\r', outstr); 1896 } 1897 (void) putc(c, outstr); 1898 } 1899 if (recvurg) 1900 goto got_oob; 1901 fflush(outstr); 1902 transflag = 0; 1903 if (ferror(instr)) 1904 goto file_err; 1905 if (ferror(outstr)) 1906 goto data_err; 1907 reply(226, "Transfer complete."); 1908 return (0); 1909 1910 case TYPE_I: 1911 case TYPE_L: 1912 /* 1913 * isreg is only set if we are not doing restart and we 1914 * are sending a regular file 1915 */ 1916 netfd = fileno(outstr); 1917 filefd = fileno(instr); 1918 1919 if (isreg) { 1920 1921 off_t offset; 1922 int err; 1923 1924 err = cnt = offset = 0; 1925 1926 while (err != -1 && filesize > 0) { 1927 err = sendfile(filefd, netfd, offset, 0, 1928 (struct sf_hdtr *) NULL, &cnt, 0); 1929 /* 1930 * Calculate byte_count before OOB processing. 1931 * It can be used in myoob() later. 1932 */ 1933 byte_count += cnt; 1934 if (recvurg) 1935 goto got_oob; 1936 offset += cnt; 1937 filesize -= cnt; 1938 1939 if (err == -1) { 1940 if (!cnt) 1941 goto oldway; 1942 1943 goto data_err; 1944 } 1945 } 1946 1947 transflag = 0; 1948 reply(226, "Transfer complete."); 1949 return (0); 1950 } 1951 1952 oldway: 1953 if ((buf = malloc((u_int)blksize)) == NULL) { 1954 transflag = 0; 1955 perror_reply(451, "Local resource failure: malloc"); 1956 return (-1); 1957 } 1958 1959 while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 && 1960 write(netfd, buf, cnt) == cnt) 1961 byte_count += cnt; 1962 transflag = 0; 1963 (void)free(buf); 1964 if (cnt != 0) { 1965 if (cnt < 0) 1966 goto file_err; 1967 goto data_err; 1968 } 1969 reply(226, "Transfer complete."); 1970 return (0); 1971 default: 1972 transflag = 0; 1973 reply(550, "Unimplemented TYPE %d in send_data", type); 1974 return (-1); 1975 } 1976 1977 data_err: 1978 transflag = 0; 1979 perror_reply(426, "Data connection"); 1980 return (-1); 1981 1982 file_err: 1983 transflag = 0; 1984 perror_reply(551, "Error on input file"); 1985 return (-1); 1986 1987 got_oob: 1988 myoob(); 1989 recvurg = 0; 1990 transflag = 0; 1991 return (-1); 1992 } 1993 1994 /* 1995 * Transfer data from peer to "outstr" using the appropriate encapulation of 1996 * the data subject to Mode, Structure, and Type. 1997 * 1998 * N.B.: Form isn't handled. 1999 */ 2000 static int 2001 receive_data(FILE *instr, FILE *outstr) 2002 { 2003 int c; 2004 int cnt, bare_lfs; 2005 char buf[BUFSIZ]; 2006 2007 transflag++; 2008 bare_lfs = 0; 2009 2010 switch (type) { 2011 2012 case TYPE_I: 2013 case TYPE_L: 2014 while ((cnt = read(fileno(instr), buf, sizeof(buf))) > 0) { 2015 if (recvurg) 2016 goto got_oob; 2017 if (write(fileno(outstr), buf, cnt) != cnt) 2018 goto file_err; 2019 byte_count += cnt; 2020 } 2021 if (recvurg) 2022 goto got_oob; 2023 if (cnt < 0) 2024 goto data_err; 2025 transflag = 0; 2026 return (0); 2027 2028 case TYPE_E: 2029 reply(553, "TYPE E not implemented."); 2030 transflag = 0; 2031 return (-1); 2032 2033 case TYPE_A: 2034 while ((c = getc(instr)) != EOF) { 2035 if (recvurg) 2036 goto got_oob; 2037 byte_count++; 2038 if (c == '\n') 2039 bare_lfs++; 2040 while (c == '\r') { 2041 if (ferror(outstr)) 2042 goto data_err; 2043 if ((c = getc(instr)) != '\n') { 2044 (void) putc ('\r', outstr); 2045 if (c == '\0' || c == EOF) 2046 goto contin2; 2047 } 2048 } 2049 (void) putc(c, outstr); 2050 contin2: ; 2051 } 2052 if (recvurg) 2053 goto got_oob; 2054 fflush(outstr); 2055 if (ferror(instr)) 2056 goto data_err; 2057 if (ferror(outstr)) 2058 goto file_err; 2059 transflag = 0; 2060 if (bare_lfs) { 2061 lreply(226, 2062 "WARNING! %d bare linefeeds received in ASCII mode", 2063 bare_lfs); 2064 (void)printf(" File may not have transferred correctly.\r\n"); 2065 } 2066 return (0); 2067 default: 2068 reply(550, "Unimplemented TYPE %d in receive_data", type); 2069 transflag = 0; 2070 return (-1); 2071 } 2072 2073 data_err: 2074 transflag = 0; 2075 perror_reply(426, "Data Connection"); 2076 return (-1); 2077 2078 file_err: 2079 transflag = 0; 2080 perror_reply(452, "Error writing file"); 2081 return (-1); 2082 2083 got_oob: 2084 myoob(); 2085 recvurg = 0; 2086 transflag = 0; 2087 return (-1); 2088 } 2089 2090 void 2091 statfilecmd(char *filename) 2092 { 2093 FILE *fin; 2094 int c; 2095 char line[LINE_MAX]; 2096 2097 (void)snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename); 2098 fin = ftpd_popen(line, "r"); 2099 lreply(211, "status of %s:", filename); 2100 while ((c = getc(fin)) != EOF) { 2101 if (c == '\n') { 2102 if (ferror(stdout)){ 2103 perror_reply(421, "control connection"); 2104 (void) ftpd_pclose(fin); 2105 dologout(1); 2106 /* NOTREACHED */ 2107 } 2108 if (ferror(fin)) { 2109 perror_reply(551, filename); 2110 (void) ftpd_pclose(fin); 2111 return; 2112 } 2113 (void) putc('\r', stdout); 2114 } 2115 (void) putc(c, stdout); 2116 } 2117 (void) ftpd_pclose(fin); 2118 reply(211, "End of Status"); 2119 } 2120 2121 void 2122 statcmd(void) 2123 { 2124 union sockunion *su; 2125 u_char *a, *p; 2126 char hname[NI_MAXHOST]; 2127 int ispassive; 2128 2129 lreply(211, "%s FTP server status:", hostname); 2130 printf(" %s\r\n", version); 2131 printf(" Connected to %s", remotehost); 2132 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 2133 hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) { 2134 if (strcmp(hname, remotehost) != 0) 2135 printf(" (%s)", hname); 2136 } 2137 printf("\r\n"); 2138 if (logged_in) { 2139 if (guest) 2140 printf(" Logged in anonymously\r\n"); 2141 else 2142 printf(" Logged in as %s\r\n", pw->pw_name); 2143 } else if (askpasswd) 2144 printf(" Waiting for password\r\n"); 2145 else 2146 printf(" Waiting for user name\r\n"); 2147 printf(" TYPE: %s", typenames[type]); 2148 if (type == TYPE_A || type == TYPE_E) 2149 printf(", FORM: %s", formnames[form]); 2150 if (type == TYPE_L) 2151 #if CHAR_BIT == 8 2152 printf(" %d", CHAR_BIT); 2153 #else 2154 printf(" %d", bytesize); /* need definition! */ 2155 #endif 2156 printf("; STRUcture: %s; transfer MODE: %s\r\n", 2157 strunames[stru], modenames[mode]); 2158 if (data != -1) 2159 printf(" Data connection open\r\n"); 2160 else if (pdata != -1) { 2161 ispassive = 1; 2162 su = &pasv_addr; 2163 goto printaddr; 2164 } else if (usedefault == 0) { 2165 ispassive = 0; 2166 su = &data_dest; 2167 printaddr: 2168 #define UC(b) (((int) b) & 0xff) 2169 if (epsvall) { 2170 printf(" EPSV only mode (EPSV ALL)\r\n"); 2171 goto epsvonly; 2172 } 2173 2174 /* PORT/PASV */ 2175 if (su->su_family == AF_INET) { 2176 a = (u_char *) &su->su_sin.sin_addr; 2177 p = (u_char *) &su->su_sin.sin_port; 2178 printf(" %s (%d,%d,%d,%d,%d,%d)\r\n", 2179 ispassive ? "PASV" : "PORT", 2180 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2181 UC(p[0]), UC(p[1])); 2182 } 2183 2184 /* LPRT/LPSV */ 2185 { 2186 int alen, af, i; 2187 2188 switch (su->su_family) { 2189 case AF_INET: 2190 a = (u_char *) &su->su_sin.sin_addr; 2191 p = (u_char *) &su->su_sin.sin_port; 2192 alen = sizeof(su->su_sin.sin_addr); 2193 af = 4; 2194 break; 2195 case AF_INET6: 2196 a = (u_char *) &su->su_sin6.sin6_addr; 2197 p = (u_char *) &su->su_sin6.sin6_port; 2198 alen = sizeof(su->su_sin6.sin6_addr); 2199 af = 6; 2200 break; 2201 default: 2202 af = 0; 2203 break; 2204 } 2205 if (af) { 2206 printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT", 2207 af, alen); 2208 for (i = 0; i < alen; i++) 2209 printf("%d,", UC(a[i])); 2210 printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 2211 } 2212 } 2213 2214 epsvonly:; 2215 /* EPRT/EPSV */ 2216 { 2217 int af; 2218 2219 switch (su->su_family) { 2220 case AF_INET: 2221 af = 1; 2222 break; 2223 case AF_INET6: 2224 af = 2; 2225 break; 2226 default: 2227 af = 0; 2228 break; 2229 } 2230 if (af) { 2231 union sockunion tmp; 2232 2233 tmp = *su; 2234 if (tmp.su_family == AF_INET6) 2235 tmp.su_sin6.sin6_scope_id = 0; 2236 if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 2237 hname, sizeof(hname) - 1, NULL, 0, 2238 NI_NUMERICHOST)) { 2239 printf(" %s |%d|%s|%d|\r\n", 2240 ispassive ? "EPSV" : "EPRT", 2241 af, hname, htons(tmp.su_port)); 2242 } 2243 } 2244 } 2245 #undef UC 2246 } else 2247 printf(" No data connection\r\n"); 2248 reply(211, "End of status"); 2249 } 2250 2251 void 2252 fatalerror(char *s) 2253 { 2254 2255 reply(451, "Error in server: %s\n", s); 2256 reply(221, "Closing connection due to server error."); 2257 dologout(0); 2258 /* NOTREACHED */ 2259 } 2260 2261 void 2262 reply(int n, const char *fmt, ...) 2263 { 2264 va_list ap; 2265 2266 va_start(ap, fmt); 2267 (void)printf("%d ", n); 2268 (void)vprintf(fmt, ap); 2269 (void)printf("\r\n"); 2270 (void)fflush(stdout); 2271 if (ftpdebug) { 2272 syslog(LOG_DEBUG, "<--- %d ", n); 2273 vsyslog(LOG_DEBUG, fmt, ap); 2274 } 2275 } 2276 2277 void 2278 lreply(int n, const char *fmt, ...) 2279 { 2280 va_list ap; 2281 2282 va_start(ap, fmt); 2283 (void)printf("%d- ", n); 2284 (void)vprintf(fmt, ap); 2285 (void)printf("\r\n"); 2286 (void)fflush(stdout); 2287 if (ftpdebug) { 2288 syslog(LOG_DEBUG, "<--- %d- ", n); 2289 vsyslog(LOG_DEBUG, fmt, ap); 2290 } 2291 } 2292 2293 static void 2294 ack(char *s) 2295 { 2296 2297 reply(250, "%s command successful.", s); 2298 } 2299 2300 void 2301 nack(char *s) 2302 { 2303 2304 reply(502, "%s command not implemented.", s); 2305 } 2306 2307 /* ARGSUSED */ 2308 void 2309 yyerror(char *s) 2310 { 2311 char *cp; 2312 2313 if ((cp = strchr(cbuf,'\n'))) 2314 *cp = '\0'; 2315 reply(500, "'%s': command not understood.", cbuf); 2316 } 2317 2318 void 2319 delete(char *name) 2320 { 2321 struct stat st; 2322 2323 LOGCMD("delete", name); 2324 if (lstat(name, &st) < 0) { 2325 perror_reply(550, name); 2326 return; 2327 } 2328 if ((st.st_mode&S_IFMT) == S_IFDIR) { 2329 if (rmdir(name) < 0) { 2330 perror_reply(550, name); 2331 return; 2332 } 2333 goto done; 2334 } 2335 if (unlink(name) < 0) { 2336 perror_reply(550, name); 2337 return; 2338 } 2339 done: 2340 ack("DELE"); 2341 } 2342 2343 void 2344 cwd(char *path) 2345 { 2346 2347 if (chdir(path) < 0) 2348 perror_reply(550, path); 2349 else 2350 ack("CWD"); 2351 } 2352 2353 void 2354 makedir(char *name) 2355 { 2356 char *s; 2357 2358 LOGCMD("mkdir", name); 2359 if (guest && noguestmkd) 2360 reply(550, "%s: permission denied", name); 2361 else if (mkdir(name, 0777) < 0) 2362 perror_reply(550, name); 2363 else { 2364 if ((s = doublequote(name)) == NULL) 2365 fatalerror("Ran out of memory."); 2366 reply(257, "\"%s\" directory created.", s); 2367 free(s); 2368 } 2369 } 2370 2371 void 2372 removedir(char *name) 2373 { 2374 2375 LOGCMD("rmdir", name); 2376 if (rmdir(name) < 0) 2377 perror_reply(550, name); 2378 else 2379 ack("RMD"); 2380 } 2381 2382 void 2383 pwd(void) 2384 { 2385 char *s, path[MAXPATHLEN + 1]; 2386 2387 if (getwd(path) == (char *)NULL) 2388 reply(550, "%s.", path); 2389 else { 2390 if ((s = doublequote(path)) == NULL) 2391 fatalerror("Ran out of memory."); 2392 reply(257, "\"%s\" is current directory.", s); 2393 free(s); 2394 } 2395 } 2396 2397 char * 2398 renamefrom(char *name) 2399 { 2400 struct stat st; 2401 2402 if (lstat(name, &st) < 0) { 2403 perror_reply(550, name); 2404 return ((char *)0); 2405 } 2406 reply(350, "File exists, ready for destination name"); 2407 return (name); 2408 } 2409 2410 void 2411 renamecmd(char *from, char *to) 2412 { 2413 struct stat st; 2414 2415 LOGCMD2("rename", from, to); 2416 2417 if (guest && (stat(to, &st) == 0)) { 2418 reply(550, "%s: permission denied", to); 2419 return; 2420 } 2421 2422 if (rename(from, to) < 0) 2423 perror_reply(550, "rename"); 2424 else 2425 ack("RNTO"); 2426 } 2427 2428 static void 2429 dolog(struct sockaddr *who) 2430 { 2431 int error; 2432 2433 realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len); 2434 2435 #ifdef SETPROCTITLE 2436 #ifdef VIRTUAL_HOSTING 2437 if (thishost != firsthost) 2438 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)", 2439 remotehost, hostname); 2440 else 2441 #endif 2442 snprintf(proctitle, sizeof(proctitle), "%s: connected", 2443 remotehost); 2444 setproctitle("%s", proctitle); 2445 #endif /* SETPROCTITLE */ 2446 2447 if (logging) { 2448 #ifdef VIRTUAL_HOSTING 2449 if (thishost != firsthost) 2450 syslog(LOG_INFO, "connection from %s (to %s)", 2451 remotehost, hostname); 2452 else 2453 #endif 2454 { 2455 char who_name[MAXHOSTNAMELEN]; 2456 2457 error = getnameinfo(who, who->sa_len, 2458 who_name, sizeof(who_name) - 1, 2459 NULL, 0, NI_NUMERICHOST); 2460 syslog(LOG_INFO, "connection from %s (%s)", remotehost, 2461 error == 0 ? who_name : ""); 2462 } 2463 } 2464 } 2465 2466 /* 2467 * Record logout in wtmp file 2468 * and exit with supplied status. 2469 */ 2470 void 2471 dologout(int status) 2472 { 2473 /* 2474 * Prevent reception of SIGURG from resulting in a resumption 2475 * back to the main program loop. 2476 */ 2477 transflag = 0; 2478 2479 if (logged_in && dowtmp) { 2480 (void) seteuid((uid_t)0); 2481 ftpd_logwtmp(ttyline, "", NULL); 2482 } 2483 /* beware of flushing buffers after a SIGPIPE */ 2484 _exit(status); 2485 } 2486 2487 static void 2488 sigurg(int signo) 2489 { 2490 2491 recvurg = 1; 2492 } 2493 2494 static void 2495 myoob(void) 2496 { 2497 char *cp; 2498 2499 /* only process if transfer occurring */ 2500 if (!transflag) 2501 return; 2502 cp = tmpline; 2503 if (getline(cp, 7, stdin) == NULL) { 2504 reply(221, "You could at least say goodbye."); 2505 dologout(0); 2506 } 2507 upper(cp); 2508 if (strcmp(cp, "ABOR\r\n") == 0) { 2509 tmpline[0] = '\0'; 2510 reply(426, "Transfer aborted. Data connection closed."); 2511 reply(226, "Abort successful"); 2512 } 2513 if (strcmp(cp, "STAT\r\n") == 0) { 2514 tmpline[0] = '\0'; 2515 if (file_size != (off_t) -1) 2516 reply(213, "Status: %qd of %qd bytes transferred", 2517 byte_count, file_size); 2518 else 2519 reply(213, "Status: %qd bytes transferred", byte_count); 2520 } 2521 } 2522 2523 /* 2524 * Note: a response of 425 is not mentioned as a possible response to 2525 * the PASV command in RFC959. However, it has been blessed as 2526 * a legitimate response by Jon Postel in a telephone conversation 2527 * with Rick Adams on 25 Jan 89. 2528 */ 2529 void 2530 passive(void) 2531 { 2532 int len, on; 2533 char *p, *a; 2534 2535 if (pdata >= 0) /* close old port if one set */ 2536 close(pdata); 2537 2538 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2539 if (pdata < 0) { 2540 perror_reply(425, "Can't open passive connection"); 2541 return; 2542 } 2543 on = 1; 2544 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2545 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2546 2547 (void) seteuid((uid_t)0); 2548 2549 #ifdef IP_PORTRANGE 2550 if (ctrl_addr.su_family == AF_INET) { 2551 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2552 : IP_PORTRANGE_DEFAULT; 2553 2554 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2555 &on, sizeof(on)) < 0) 2556 goto pasv_error; 2557 } 2558 #endif 2559 #ifdef IPV6_PORTRANGE 2560 if (ctrl_addr.su_family == AF_INET6) { 2561 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2562 : IPV6_PORTRANGE_DEFAULT; 2563 2564 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2565 &on, sizeof(on)) < 0) 2566 goto pasv_error; 2567 } 2568 #endif 2569 2570 pasv_addr = ctrl_addr; 2571 pasv_addr.su_port = 0; 2572 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2573 goto pasv_error; 2574 2575 (void) seteuid((uid_t)pw->pw_uid); 2576 2577 len = sizeof(pasv_addr); 2578 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2579 goto pasv_error; 2580 if (listen(pdata, 1) < 0) 2581 goto pasv_error; 2582 if (pasv_addr.su_family == AF_INET) 2583 a = (char *) &pasv_addr.su_sin.sin_addr; 2584 else if (pasv_addr.su_family == AF_INET6 && 2585 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) 2586 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2587 else 2588 goto pasv_error; 2589 2590 p = (char *) &pasv_addr.su_port; 2591 2592 #define UC(b) (((int) b) & 0xff) 2593 2594 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2595 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2596 return; 2597 2598 pasv_error: 2599 (void) seteuid((uid_t)pw->pw_uid); 2600 (void) close(pdata); 2601 pdata = -1; 2602 perror_reply(425, "Can't open passive connection"); 2603 return; 2604 } 2605 2606 /* 2607 * Long Passive defined in RFC 1639. 2608 * 228 Entering Long Passive Mode 2609 * (af, hal, h1, h2, h3,..., pal, p1, p2...) 2610 */ 2611 2612 void 2613 long_passive(char *cmd, int pf) 2614 { 2615 int len, on; 2616 char *p, *a; 2617 2618 if (pdata >= 0) /* close old port if one set */ 2619 close(pdata); 2620 2621 if (pf != PF_UNSPEC) { 2622 if (ctrl_addr.su_family != pf) { 2623 switch (ctrl_addr.su_family) { 2624 case AF_INET: 2625 pf = 1; 2626 break; 2627 case AF_INET6: 2628 pf = 2; 2629 break; 2630 default: 2631 pf = 0; 2632 break; 2633 } 2634 /* 2635 * XXX 2636 * only EPRT/EPSV ready clients will understand this 2637 */ 2638 if (strcmp(cmd, "EPSV") == 0 && pf) { 2639 reply(522, "Network protocol mismatch, " 2640 "use (%d)", pf); 2641 } else 2642 reply(501, "Network protocol mismatch"); /*XXX*/ 2643 2644 return; 2645 } 2646 } 2647 2648 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2649 if (pdata < 0) { 2650 perror_reply(425, "Can't open passive connection"); 2651 return; 2652 } 2653 on = 1; 2654 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2655 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2656 2657 (void) seteuid((uid_t)0); 2658 2659 pasv_addr = ctrl_addr; 2660 pasv_addr.su_port = 0; 2661 len = pasv_addr.su_len; 2662 2663 #ifdef IP_PORTRANGE 2664 if (ctrl_addr.su_family == AF_INET) { 2665 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2666 : IP_PORTRANGE_DEFAULT; 2667 2668 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2669 &on, sizeof(on)) < 0) 2670 goto pasv_error; 2671 } 2672 #endif 2673 #ifdef IPV6_PORTRANGE 2674 if (ctrl_addr.su_family == AF_INET6) { 2675 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2676 : IPV6_PORTRANGE_DEFAULT; 2677 2678 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2679 &on, sizeof(on)) < 0) 2680 goto pasv_error; 2681 } 2682 #endif 2683 2684 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0) 2685 goto pasv_error; 2686 2687 (void) seteuid((uid_t)pw->pw_uid); 2688 2689 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2690 goto pasv_error; 2691 if (listen(pdata, 1) < 0) 2692 goto pasv_error; 2693 2694 #define UC(b) (((int) b) & 0xff) 2695 2696 if (strcmp(cmd, "LPSV") == 0) { 2697 p = (char *)&pasv_addr.su_port; 2698 switch (pasv_addr.su_family) { 2699 case AF_INET: 2700 a = (char *) &pasv_addr.su_sin.sin_addr; 2701 v4_reply: 2702 reply(228, 2703 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2704 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2705 2, UC(p[0]), UC(p[1])); 2706 return; 2707 case AF_INET6: 2708 if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) { 2709 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2710 goto v4_reply; 2711 } 2712 a = (char *) &pasv_addr.su_sin6.sin6_addr; 2713 reply(228, 2714 "Entering Long Passive Mode " 2715 "(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2716 6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2717 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 2718 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 2719 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 2720 2, UC(p[0]), UC(p[1])); 2721 return; 2722 } 2723 } else if (strcmp(cmd, "EPSV") == 0) { 2724 switch (pasv_addr.su_family) { 2725 case AF_INET: 2726 case AF_INET6: 2727 reply(229, "Entering Extended Passive Mode (|||%d|)", 2728 ntohs(pasv_addr.su_port)); 2729 return; 2730 } 2731 } else { 2732 /* more proper error code? */ 2733 } 2734 2735 pasv_error: 2736 (void) seteuid((uid_t)pw->pw_uid); 2737 (void) close(pdata); 2738 pdata = -1; 2739 perror_reply(425, "Can't open passive connection"); 2740 return; 2741 } 2742 2743 /* 2744 * Generate unique name for file with basename "local" 2745 * and open the file in order to avoid possible races. 2746 * Try "local" first, then "local.1", "local.2" etc, up to "local.99". 2747 * Return descriptor to the file, set "name" to its name. 2748 * 2749 * Generates failure reply on error. 2750 */ 2751 static int 2752 guniquefd(char *local, char **name) 2753 { 2754 static char new[MAXPATHLEN]; 2755 struct stat st; 2756 char *cp; 2757 int count; 2758 int fd; 2759 2760 cp = strrchr(local, '/'); 2761 if (cp) 2762 *cp = '\0'; 2763 if (stat(cp ? local : ".", &st) < 0) { 2764 perror_reply(553, cp ? local : "."); 2765 return (-1); 2766 } 2767 if (cp) { 2768 /* 2769 * Let not overwrite dirname with counter suffix. 2770 * -4 is for /nn\0 2771 * In this extreme case dot won't be put in front of suffix. 2772 */ 2773 if (strlen(local) > sizeof(new) - 4) { 2774 reply(553, "Pathname too long"); 2775 return (-1); 2776 } 2777 *cp = '/'; 2778 } 2779 /* -4 is for the .nn<null> we put on the end below */ 2780 (void) snprintf(new, sizeof(new) - 4, "%s", local); 2781 cp = new + strlen(new); 2782 /* 2783 * Don't generate dotfile unless requested explicitly. 2784 * This covers the case when basename gets truncated off 2785 * by buffer size. 2786 */ 2787 if (cp > new && cp[-1] != '/') 2788 *cp++ = '.'; 2789 for (count = 0; count < 100; count++) { 2790 /* At count 0 try unmodified name */ 2791 if (count) 2792 (void)sprintf(cp, "%d", count); 2793 if ((fd = open(count ? new : local, 2794 O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) { 2795 *name = count ? new : local; 2796 return (fd); 2797 } 2798 } 2799 reply(452, "Unique file name cannot be created."); 2800 return (-1); 2801 } 2802 2803 /* 2804 * Format and send reply containing system error number. 2805 */ 2806 void 2807 perror_reply(int code, char *string) 2808 { 2809 2810 reply(code, "%s: %s.", string, strerror(errno)); 2811 } 2812 2813 static char *onefile[] = { 2814 "", 2815 0 2816 }; 2817 2818 void 2819 send_file_list(char *whichf) 2820 { 2821 struct stat st; 2822 DIR *dirp = NULL; 2823 struct dirent *dir; 2824 FILE *dout = NULL; 2825 char **dirlist, *dirname; 2826 int simple = 0; 2827 int freeglob = 0; 2828 glob_t gl; 2829 2830 if (strpbrk(whichf, "~{[*?") != NULL) { 2831 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 2832 2833 memset(&gl, 0, sizeof(gl)); 2834 gl.gl_matchc = MAXGLOBARGS; 2835 flags |= GLOB_LIMIT; 2836 freeglob = 1; 2837 if (glob(whichf, flags, 0, &gl)) { 2838 reply(550, "not found"); 2839 goto out; 2840 } else if (gl.gl_pathc == 0) { 2841 errno = ENOENT; 2842 perror_reply(550, whichf); 2843 goto out; 2844 } 2845 dirlist = gl.gl_pathv; 2846 } else { 2847 onefile[0] = whichf; 2848 dirlist = onefile; 2849 simple = 1; 2850 } 2851 2852 while ((dirname = *dirlist++)) { 2853 if (stat(dirname, &st) < 0) { 2854 /* 2855 * If user typed "ls -l", etc, and the client 2856 * used NLST, do what the user meant. 2857 */ 2858 if (dirname[0] == '-' && *dirlist == NULL && 2859 transflag == 0) { 2860 retrieve(_PATH_LS " %s", dirname); 2861 goto out; 2862 } 2863 perror_reply(550, whichf); 2864 if (dout != NULL) { 2865 (void) fclose(dout); 2866 transflag = 0; 2867 data = -1; 2868 pdata = -1; 2869 } 2870 goto out; 2871 } 2872 2873 if (S_ISREG(st.st_mode)) { 2874 if (dout == NULL) { 2875 dout = dataconn("file list", (off_t)-1, "w"); 2876 if (dout == NULL) 2877 goto out; 2878 transflag++; 2879 } 2880 fprintf(dout, "%s%s\n", dirname, 2881 type == TYPE_A ? "\r" : ""); 2882 byte_count += strlen(dirname) + 1; 2883 continue; 2884 } else if (!S_ISDIR(st.st_mode)) 2885 continue; 2886 2887 if ((dirp = opendir(dirname)) == NULL) 2888 continue; 2889 2890 while ((dir = readdir(dirp)) != NULL) { 2891 char nbuf[MAXPATHLEN]; 2892 2893 if (recvurg) { 2894 myoob(); 2895 recvurg = 0; 2896 transflag = 0; 2897 goto out; 2898 } 2899 2900 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 2901 continue; 2902 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 2903 dir->d_namlen == 2) 2904 continue; 2905 2906 snprintf(nbuf, sizeof(nbuf), 2907 "%s/%s", dirname, dir->d_name); 2908 2909 /* 2910 * We have to do a stat to insure it's 2911 * not a directory or special file. 2912 */ 2913 if (simple || (stat(nbuf, &st) == 0 && 2914 S_ISREG(st.st_mode))) { 2915 if (dout == NULL) { 2916 dout = dataconn("file list", (off_t)-1, 2917 "w"); 2918 if (dout == NULL) 2919 goto out; 2920 transflag++; 2921 } 2922 if (nbuf[0] == '.' && nbuf[1] == '/') 2923 fprintf(dout, "%s%s\n", &nbuf[2], 2924 type == TYPE_A ? "\r" : ""); 2925 else 2926 fprintf(dout, "%s%s\n", nbuf, 2927 type == TYPE_A ? "\r" : ""); 2928 byte_count += strlen(nbuf) + 1; 2929 } 2930 } 2931 (void) closedir(dirp); 2932 } 2933 2934 if (dout == NULL) 2935 reply(550, "No files found."); 2936 else if (ferror(dout) != 0) 2937 perror_reply(550, "Data connection"); 2938 else 2939 reply(226, "Transfer complete."); 2940 2941 transflag = 0; 2942 if (dout != NULL) 2943 (void) fclose(dout); 2944 data = -1; 2945 pdata = -1; 2946 out: 2947 if (freeglob) { 2948 freeglob = 0; 2949 globfree(&gl); 2950 } 2951 } 2952 2953 void 2954 reapchild(int signo) 2955 { 2956 while (wait3(NULL, WNOHANG, NULL) > 0); 2957 } 2958 2959 #ifdef OLD_SETPROCTITLE 2960 /* 2961 * Clobber argv so ps will show what we're doing. (Stolen from sendmail.) 2962 * Warning, since this is usually started from inetd.conf, it often doesn't 2963 * have much of an environment or arglist to overwrite. 2964 */ 2965 void 2966 setproctitle(const char *fmt, ...) 2967 { 2968 int i; 2969 va_list ap; 2970 char *p, *bp, ch; 2971 char buf[LINE_MAX]; 2972 2973 va_start(ap, fmt); 2974 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 2975 2976 /* make ps print our process name */ 2977 p = Argv[0]; 2978 *p++ = '-'; 2979 2980 i = strlen(buf); 2981 if (i > LastArgv - p - 2) { 2982 i = LastArgv - p - 2; 2983 buf[i] = '\0'; 2984 } 2985 bp = buf; 2986 while (ch = *bp++) 2987 if (ch != '\n' && ch != '\r') 2988 *p++ = ch; 2989 while (p < LastArgv) 2990 *p++ = ' '; 2991 } 2992 #endif /* OLD_SETPROCTITLE */ 2993 2994 static void 2995 logxfer(char *name, off_t size, time_t start) 2996 { 2997 char buf[1024]; 2998 char path[MAXPATHLEN + 1]; 2999 time_t now; 3000 3001 if (statfd >= 0 && getwd(path) != NULL) { 3002 time(&now); 3003 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s/%s!%qd!%ld\n", 3004 ctime(&now)+4, ident, remotehost, 3005 path, name, (long long)size, 3006 (long)(now - start + (now == start))); 3007 write(statfd, buf, strlen(buf)); 3008 } 3009 } 3010 3011 static char * 3012 doublequote(char *s) 3013 { 3014 int n; 3015 char *p, *s2; 3016 3017 for (p = s, n = 0; *p; p++) 3018 if (*p == '"') 3019 n++; 3020 3021 if ((s2 = malloc(p - s + n + 1)) == NULL) 3022 return (NULL); 3023 3024 for (p = s2; *s; s++, p++) { 3025 if ((*p = *s) == '"') 3026 *(++p) = '"'; 3027 } 3028 *p = '\0'; 3029 3030 return (s2); 3031 } 3032