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 #if __STDC__ 102 #include <stdarg.h> 103 #else 104 #include <varargs.h> 105 #endif 106 107 static char version[] = "Version 6.00LS"; 108 #undef main 109 110 /* wrapper for KAME-special getnameinfo() */ 111 #ifndef NI_WITHSCOPEID 112 #define NI_WITHSCOPEID 0 113 #endif 114 115 extern off_t restart_point; 116 extern char cbuf[]; 117 118 union sockunion server_addr; 119 union sockunion ctrl_addr; 120 union sockunion data_source; 121 union sockunion data_dest; 122 union sockunion his_addr; 123 union sockunion pasv_addr; 124 125 int daemon_mode; 126 int data; 127 int logged_in; 128 struct passwd *pw; 129 int ftpdebug; 130 int timeout = 900; /* timeout after 15 minutes of inactivity */ 131 int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 132 int logging; 133 int restricted_data_ports = 1; 134 int paranoid = 1; /* be extra careful about security */ 135 int anon_only = 0; /* Only anonymous ftp allowed */ 136 int guest; 137 int dochroot; 138 int stats; 139 int statfd = -1; 140 int type; 141 int form; 142 int stru; /* avoid C keyword */ 143 int mode; 144 int usedefault = 1; /* for data transfers */ 145 int pdata = -1; /* for passive mode */ 146 int readonly=0; /* Server is in readonly mode. */ 147 int noepsv=0; /* EPSV command is disabled. */ 148 int noretr=0; /* RETR command is disabled. */ 149 int noguestretr=0; /* RETR command is disabled for anon users. */ 150 151 static volatile sig_atomic_t recvurg; 152 sig_atomic_t transflag; 153 off_t file_size; 154 off_t byte_count; 155 #if !defined(CMASK) || CMASK == 0 156 #undef CMASK 157 #define CMASK 027 158 #endif 159 int defumask = CMASK; /* default umask value */ 160 char tmpline[7]; 161 char *hostname; 162 int epsvall = 0; 163 164 #ifdef VIRTUAL_HOSTING 165 char *ftpuser; 166 167 static struct ftphost { 168 struct ftphost *next; 169 struct addrinfo *hostinfo; 170 char *hostname; 171 char *anonuser; 172 char *statfile; 173 char *welcome; 174 char *loginmsg; 175 } *thishost, *firsthost; 176 177 #endif 178 char remotehost[MAXHOSTNAMELEN]; 179 char *ident = NULL; 180 181 static char ttyline[20]; 182 char *tty = ttyline; /* for klogin */ 183 184 #ifdef USE_PAM 185 static int auth_pam __P((struct passwd**, const char*)); 186 pam_handle_t *pamh = NULL; 187 #endif 188 189 static struct opie opiedata; 190 static char opieprompt[OPIE_CHALLENGE_MAX+1]; 191 static int pwok; 192 193 char *pid_file = NULL; 194 195 /* 196 * Limit number of pathnames that glob can return. 197 * A limit of 0 indicates the number of pathnames is unlimited. 198 */ 199 #define MAXGLOBARGS 16384 200 # 201 202 /* 203 * Timeout intervals for retrying connections 204 * to hosts that don't accept PORT cmds. This 205 * is a kludge, but given the problems with TCP... 206 */ 207 #define SWAITMAX 90 /* wait at most 90 seconds */ 208 #define SWAITINT 5 /* interval between retries */ 209 210 int swaitmax = SWAITMAX; 211 int swaitint = SWAITINT; 212 213 #ifdef SETPROCTITLE 214 #ifdef OLD_SETPROCTITLE 215 char **Argv = NULL; /* pointer to argument vector */ 216 char *LastArgv = NULL; /* end of argv */ 217 #endif /* OLD_SETPROCTITLE */ 218 char proctitle[LINE_MAX]; /* initial part of title */ 219 #endif /* SETPROCTITLE */ 220 221 #define LOGCMD(cmd, file) \ 222 if (logging > 1) \ 223 syslog(LOG_INFO,"%s %s%s", cmd, \ 224 *(file) == '/' ? "" : curdir(), file); 225 #define LOGCMD2(cmd, file1, file2) \ 226 if (logging > 1) \ 227 syslog(LOG_INFO,"%s %s%s %s%s", cmd, \ 228 *(file1) == '/' ? "" : curdir(), file1, \ 229 *(file2) == '/' ? "" : curdir(), file2); 230 #define LOGBYTES(cmd, file, cnt) \ 231 if (logging > 1) { \ 232 if (cnt == (off_t)-1) \ 233 syslog(LOG_INFO,"%s %s%s", cmd, \ 234 *(file) == '/' ? "" : curdir(), file); \ 235 else \ 236 syslog(LOG_INFO, "%s %s%s = %qd bytes", \ 237 cmd, (*(file) == '/') ? "" : curdir(), file, cnt); \ 238 } 239 240 #ifdef VIRTUAL_HOSTING 241 static void inithosts __P((void)); 242 static void selecthost __P((union sockunion *)); 243 #endif 244 static void ack __P((char *)); 245 static void sigurg __P((int)); 246 static void myoob __P((void)); 247 static int checkuser __P((char *, char *, int)); 248 static FILE *dataconn __P((char *, off_t, char *)); 249 static void dolog __P((struct sockaddr *)); 250 static char *curdir __P((void)); 251 static void end_login __P((void)); 252 static FILE *getdatasock __P((char *)); 253 static char *gunique __P((char *)); 254 static void lostconn __P((int)); 255 static void sigquit __P((int)); 256 static int receive_data __P((FILE *, FILE *)); 257 static int send_data __P((FILE *, FILE *, off_t, off_t, int)); 258 static struct passwd * 259 sgetpwnam __P((char *)); 260 static char *sgetsave __P((char *)); 261 static void reapchild __P((int)); 262 static void logxfer __P((char *, off_t, time_t)); 263 264 static char * 265 curdir() 266 { 267 static char path[MAXPATHLEN+1+1]; /* path + '/' + '\0' */ 268 269 if (getcwd(path, sizeof(path)-2) == NULL) 270 return (""); 271 if (path[1] != '\0') /* special case for root dir. */ 272 strcat(path, "/"); 273 /* For guest account, skip / since it's chrooted */ 274 return (guest ? path+1 : path); 275 } 276 277 int 278 main(argc, argv, envp) 279 int argc; 280 char *argv[]; 281 char **envp; 282 { 283 int addrlen, ch, on = 1, tos; 284 char *cp, line[LINE_MAX]; 285 FILE *fd; 286 int error; 287 char *bindname = NULL; 288 int family = AF_UNSPEC; 289 int enable_v4 = 0; 290 struct sigaction sa; 291 292 tzset(); /* in case no timezone database in ~ftp */ 293 sigemptyset(&sa.sa_mask); 294 sa.sa_flags = SA_RESTART; 295 296 #ifdef OLD_SETPROCTITLE 297 /* 298 * Save start and extent of argv for setproctitle. 299 */ 300 Argv = argv; 301 while (*envp) 302 envp++; 303 LastArgv = envp[-1] + strlen(envp[-1]); 304 #endif /* OLD_SETPROCTITLE */ 305 306 307 while ((ch = getopt(argc, argv, "AdlDESURrt:T:u:vOoa:p:46")) != -1) { 308 switch (ch) { 309 case 'D': 310 daemon_mode++; 311 break; 312 313 case 'd': 314 ftpdebug++; 315 break; 316 317 case 'E': 318 noepsv = 1; 319 break; 320 321 case 'l': 322 logging++; /* > 1 == extra logging */ 323 break; 324 325 case 'r': 326 readonly = 1; 327 break; 328 329 case 'R': 330 paranoid = 0; 331 break; 332 333 case 'S': 334 stats++; 335 break; 336 337 case 'T': 338 maxtimeout = atoi(optarg); 339 if (timeout > maxtimeout) 340 timeout = maxtimeout; 341 break; 342 343 case 't': 344 timeout = atoi(optarg); 345 if (maxtimeout < timeout) 346 maxtimeout = timeout; 347 break; 348 349 case 'U': 350 restricted_data_ports = 0; 351 break; 352 353 case 'a': 354 bindname = optarg; 355 break; 356 357 case 'p': 358 pid_file = optarg; 359 break; 360 361 case 'u': 362 { 363 long val = 0; 364 365 val = strtol(optarg, &optarg, 8); 366 if (*optarg != '\0' || val < 0) 367 warnx("bad value for -u"); 368 else 369 defumask = val; 370 break; 371 } 372 case 'A': 373 anon_only = 1; 374 break; 375 376 case 'v': 377 ftpdebug = 1; 378 break; 379 380 case '4': 381 enable_v4 = 1; 382 if (family == AF_UNSPEC) 383 family = AF_INET; 384 break; 385 386 case '6': 387 family = AF_INET6; 388 break; 389 390 case 'O': 391 noguestretr = 1; 392 break; 393 394 case 'o': 395 noretr = 1; 396 break; 397 398 default: 399 warnx("unknown flag -%c ignored", optopt); 400 break; 401 } 402 } 403 404 #ifdef VIRTUAL_HOSTING 405 inithosts(); 406 #endif 407 (void) freopen(_PATH_DEVNULL, "w", stderr); 408 409 /* 410 * LOG_NDELAY sets up the logging connection immediately, 411 * necessary for anonymous ftp's that chroot and can't do it later. 412 */ 413 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 414 415 if (daemon_mode) { 416 int ctl_sock, fd; 417 struct addrinfo hints, *res; 418 419 /* 420 * Detach from parent. 421 */ 422 if (daemon(1, 1) < 0) { 423 syslog(LOG_ERR, "failed to become a daemon"); 424 exit(1); 425 } 426 sa.sa_handler = reapchild; 427 (void)sigaction(SIGCHLD, &sa, NULL); 428 /* init bind_sa */ 429 memset(&hints, 0, sizeof(hints)); 430 431 hints.ai_family = family == AF_UNSPEC ? AF_INET : family; 432 hints.ai_socktype = SOCK_STREAM; 433 hints.ai_protocol = 0; 434 hints.ai_flags = AI_PASSIVE; 435 error = getaddrinfo(bindname, "ftp", &hints, &res); 436 if (error) { 437 if (family == AF_UNSPEC) { 438 hints.ai_family = AF_UNSPEC; 439 error = getaddrinfo(bindname, "ftp", &hints, 440 &res); 441 } 442 } 443 if (error) { 444 syslog(LOG_ERR, "%s", gai_strerror(error)); 445 if (error == EAI_SYSTEM) 446 syslog(LOG_ERR, "%s", strerror(errno)); 447 exit(1); 448 } 449 if (res->ai_addr == NULL) { 450 syslog(LOG_ERR, "-a %s: getaddrinfo failed", hostname); 451 exit(1); 452 } else 453 family = res->ai_addr->sa_family; 454 /* 455 * Open a socket, bind it to the FTP port, and start 456 * listening. 457 */ 458 ctl_sock = socket(family, SOCK_STREAM, 0); 459 if (ctl_sock < 0) { 460 syslog(LOG_ERR, "control socket: %m"); 461 exit(1); 462 } 463 if (setsockopt(ctl_sock, SOL_SOCKET, SO_REUSEADDR, 464 (char *)&on, sizeof(on)) < 0) 465 syslog(LOG_ERR, "control setsockopt: %m"); 466 #ifdef IPV6_BINDV6ONLY 467 if (family == AF_INET6 && enable_v4 == 0) { 468 if (setsockopt(ctl_sock, IPPROTO_IPV6, IPV6_BINDV6ONLY, 469 (char *)&on, sizeof (on)) < 0) 470 syslog(LOG_ERR, 471 "control setsockopt(IPV6_BINDV6ONLY): %m"); 472 } 473 #endif /* IPV6_BINDV6ONLY */ 474 memcpy(&server_addr, res->ai_addr, res->ai_addr->sa_len); 475 if (bind(ctl_sock, (struct sockaddr *)&server_addr, 476 server_addr.su_len) < 0) { 477 syslog(LOG_ERR, "control bind: %m"); 478 exit(1); 479 } 480 if (listen(ctl_sock, 32) < 0) { 481 syslog(LOG_ERR, "control listen: %m"); 482 exit(1); 483 } 484 /* 485 * Atomically write process ID 486 */ 487 if (pid_file) 488 { 489 int fd; 490 char buf[20]; 491 492 fd = open(pid_file, O_CREAT | O_WRONLY | O_TRUNC 493 | O_NONBLOCK | O_EXLOCK, 0644); 494 if (fd < 0) { 495 if (errno == EAGAIN) 496 errx(1, "%s: file locked", pid_file); 497 else 498 err(1, "%s", pid_file); 499 } 500 snprintf(buf, sizeof(buf), 501 "%lu\n", (unsigned long) getpid()); 502 if (write(fd, buf, strlen(buf)) < 0) 503 err(1, "%s: write", pid_file); 504 /* Leave the pid file open and locked */ 505 } 506 /* 507 * Loop forever accepting connection requests and forking off 508 * children to handle them. 509 */ 510 while (1) { 511 addrlen = server_addr.su_len; 512 fd = accept(ctl_sock, (struct sockaddr *)&his_addr, &addrlen); 513 if (fork() == 0) { 514 /* child */ 515 (void) dup2(fd, 0); 516 (void) dup2(fd, 1); 517 close(ctl_sock); 518 break; 519 } 520 close(fd); 521 } 522 } else { 523 addrlen = sizeof(his_addr); 524 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 525 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 526 exit(1); 527 } 528 } 529 530 sa.sa_handler = SIG_DFL; 531 (void)sigaction(SIGCHLD, &sa, NULL); 532 533 sa.sa_handler = sigurg; 534 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */ 535 (void)sigaction(SIGURG, &sa, NULL); 536 537 sigfillset(&sa.sa_mask); /* block all signals in handler */ 538 sa.sa_flags = SA_RESTART; 539 sa.sa_handler = sigquit; 540 (void)sigaction(SIGHUP, &sa, NULL); 541 (void)sigaction(SIGINT, &sa, NULL); 542 (void)sigaction(SIGQUIT, &sa, NULL); 543 (void)sigaction(SIGTERM, &sa, NULL); 544 545 sa.sa_handler = lostconn; 546 (void)sigaction(SIGPIPE, &sa, NULL); 547 548 addrlen = sizeof(ctrl_addr); 549 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 550 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 551 exit(1); 552 } 553 #ifdef VIRTUAL_HOSTING 554 /* select our identity from virtual host table */ 555 selecthost(&ctrl_addr); 556 #endif 557 #ifdef IP_TOS 558 if (ctrl_addr.su_family == AF_INET) 559 { 560 tos = IPTOS_LOWDELAY; 561 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, sizeof(int)) < 0) 562 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 563 } 564 #endif 565 /* 566 * Disable Nagle on the control channel so that we don't have to wait 567 * for peer's ACK before issuing our next reply. 568 */ 569 if (setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0) 570 syslog(LOG_WARNING, "control setsockopt TCP_NODELAY: %m"); 571 572 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 573 574 /* set this here so klogin can use it... */ 575 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 576 577 /* Try to handle urgent data inline */ 578 #ifdef SO_OOBINLINE 579 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 580 syslog(LOG_ERR, "setsockopt: %m"); 581 #endif 582 583 #ifdef F_SETOWN 584 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 585 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 586 #endif 587 dolog((struct sockaddr *)&his_addr); 588 /* 589 * Set up default state 590 */ 591 data = -1; 592 type = TYPE_A; 593 form = FORM_N; 594 stru = STRU_F; 595 mode = MODE_S; 596 tmpline[0] = '\0'; 597 598 /* If logins are disabled, print out the message. */ 599 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 600 while (fgets(line, sizeof(line), fd) != NULL) { 601 if ((cp = strchr(line, '\n')) != NULL) 602 *cp = '\0'; 603 lreply(530, "%s", line); 604 } 605 (void) fflush(stdout); 606 (void) fclose(fd); 607 reply(530, "System not available."); 608 exit(0); 609 } 610 #ifdef VIRTUAL_HOSTING 611 if ((fd = fopen(thishost->welcome, "r")) != NULL) { 612 #else 613 if ((fd = fopen(_PATH_FTPWELCOME, "r")) != NULL) { 614 #endif 615 while (fgets(line, sizeof(line), fd) != NULL) { 616 if ((cp = strchr(line, '\n')) != NULL) 617 *cp = '\0'; 618 lreply(220, "%s", line); 619 } 620 (void) fflush(stdout); 621 (void) fclose(fd); 622 /* reply(220,) must follow */ 623 } 624 #ifndef VIRTUAL_HOSTING 625 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 626 fatalerror("Ran out of memory."); 627 (void) gethostname(hostname, MAXHOSTNAMELEN - 1); 628 hostname[MAXHOSTNAMELEN - 1] = '\0'; 629 #endif 630 reply(220, "%s FTP server (%s) ready.", hostname, version); 631 for (;;) 632 (void) yyparse(); 633 /* NOTREACHED */ 634 } 635 636 static void 637 lostconn(signo) 638 int signo; 639 { 640 641 if (ftpdebug) 642 syslog(LOG_DEBUG, "lost connection"); 643 dologout(1); 644 } 645 646 static void 647 sigquit(signo) 648 int signo; 649 { 650 651 syslog(LOG_ERR, "got signal %d", signo); 652 dologout(1); 653 } 654 655 #ifdef VIRTUAL_HOSTING 656 /* 657 * read in virtual host tables (if they exist) 658 */ 659 660 static void 661 inithosts() 662 { 663 FILE *fp; 664 char *cp; 665 struct ftphost *hrp, *lhrp; 666 char line[1024]; 667 struct addrinfo hints, *res, *ai; 668 669 /* 670 * Fill in the default host information 671 */ 672 if (gethostname(line, sizeof(line)) < 0) 673 line[0] = '\0'; 674 if ((hrp = malloc(sizeof(struct ftphost))) == NULL || 675 (hrp->hostname = strdup(line)) == NULL) 676 fatalerror("Ran out of memory."); 677 hrp->hostinfo = NULL; 678 679 memset(&hints, 0, sizeof(hints)); 680 hints.ai_flags = AI_CANONNAME; 681 hints.ai_family = AF_UNSPEC; 682 getaddrinfo(hrp->hostname, NULL, &hints, &res); 683 if (res) 684 hrp->hostinfo = res; 685 hrp->statfile = _PATH_FTPDSTATFILE; 686 hrp->welcome = _PATH_FTPWELCOME; 687 hrp->loginmsg = _PATH_FTPLOGINMESG; 688 hrp->anonuser = "ftp"; 689 hrp->next = NULL; 690 thishost = firsthost = lhrp = hrp; 691 if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) { 692 int addrsize, error, gothost; 693 void *addr; 694 struct hostent *hp; 695 696 while (fgets(line, sizeof(line), fp) != NULL) { 697 int i, hp_error; 698 699 if ((cp = strchr(line, '\n')) == NULL) { 700 /* ignore long lines */ 701 while (fgets(line, sizeof(line), fp) != NULL && 702 strchr(line, '\n') == NULL) 703 ; 704 continue; 705 } 706 *cp = '\0'; 707 cp = strtok(line, " \t"); 708 /* skip comments and empty lines */ 709 if (cp == NULL || line[0] == '#') 710 continue; 711 712 hints.ai_flags = 0; 713 hints.ai_family = AF_UNSPEC; 714 hints.ai_flags = AI_PASSIVE; 715 error = getaddrinfo(cp, NULL, &hints, &res); 716 if (error != NULL) 717 continue; 718 for (ai = res; ai != NULL && ai->ai_addr != NULL; 719 ai = ai->ai_next) { 720 721 gothost = 0; 722 for (hrp = firsthost; hrp != NULL; hrp = hrp->next) { 723 struct addrinfo *hi; 724 725 for (hi = hrp->hostinfo; hi != NULL; 726 hi = hi->ai_next) 727 if (hi->ai_addrlen == ai->ai_addrlen && 728 memcmp(hi->ai_addr, 729 ai->ai_addr, 730 ai->ai_addr->sa_len) == 0) { 731 gothost++; 732 break; 733 } 734 if (gothost) 735 break; 736 } 737 if (hrp == NULL) { 738 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 739 continue; 740 /* defaults */ 741 hrp->statfile = _PATH_FTPDSTATFILE; 742 hrp->welcome = _PATH_FTPWELCOME; 743 hrp->loginmsg = _PATH_FTPLOGINMESG; 744 hrp->anonuser = "ftp"; 745 hrp->next = NULL; 746 lhrp->next = hrp; 747 lhrp = hrp; 748 } 749 hrp->hostinfo = res; 750 751 /* 752 * determine hostname to use. 753 * force defined name if there is a valid alias 754 * otherwise fallback to primary hostname 755 */ 756 /* XXX: getaddrinfo() can't do alias check */ 757 switch(hrp->hostinfo->ai_family) { 758 case AF_INET: 759 addr = &((struct sockaddr_in *)&hrp->hostinfo->ai_addr)->sin_addr; 760 addrsize = sizeof(struct sockaddr_in); 761 break; 762 case AF_INET6: 763 addr = &((struct sockaddr_in6 *)&hrp->hostinfo->ai_addr)->sin6_addr; 764 addrsize = sizeof(struct sockaddr_in6); 765 break; 766 default: 767 /* should not reach here */ 768 if (hrp->hostinfo != NULL) 769 freeaddrinfo(hrp->hostinfo); 770 free(hrp); 771 continue; 772 /* NOTREACHED */ 773 } 774 if ((hp = getipnodebyaddr((char*)addr, addrsize, 775 hrp->hostinfo->ai_family, 776 &hp_error)) != NULL) { 777 if (strcmp(cp, hp->h_name) != 0) { 778 if (hp->h_aliases == NULL) 779 cp = hp->h_name; 780 else { 781 i = 0; 782 while (hp->h_aliases[i] && 783 strcmp(cp, hp->h_aliases[i]) != 0) 784 ++i; 785 if (hp->h_aliases[i] == NULL) 786 cp = hp->h_name; 787 } 788 } 789 } 790 hrp->hostname = strdup(cp); 791 freehostent(hp); 792 /* ok, now we now peel off the rest */ 793 i = 0; 794 while (i < 4 && (cp = strtok(NULL, " \t")) != NULL) { 795 if (*cp != '-' && (cp = strdup(cp)) != NULL) { 796 switch (i) { 797 case 0: /* anon user permissions */ 798 hrp->anonuser = cp; 799 break; 800 case 1: /* statistics file */ 801 hrp->statfile = cp; 802 break; 803 case 2: /* welcome message */ 804 hrp->welcome = cp; 805 break; 806 case 3: /* login message */ 807 hrp->loginmsg = cp; 808 break; 809 } 810 } 811 ++i; 812 } 813 /* XXX: re-initialization for getaddrinfo() loop */ 814 cp = strtok(line, " \t"); 815 } 816 } 817 (void) fclose(fp); 818 } 819 } 820 821 static void 822 selecthost(su) 823 union sockunion *su; 824 { 825 struct ftphost *hrp; 826 u_int16_t port; 827 #ifdef INET6 828 struct in6_addr *mapped_in6 = NULL; 829 #endif 830 struct addrinfo *hi; 831 832 #ifdef INET6 833 /* 834 * XXX IPv4 mapped IPv6 addr consideraton, 835 * specified in rfc2373. 836 */ 837 if (su->su_family == AF_INET6 && 838 IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr)) 839 mapped_in6 = &su->su_sin6.sin6_addr; 840 #endif 841 842 hrp = thishost = firsthost; /* default */ 843 port = su->su_port; 844 su->su_port = 0; 845 while (hrp != NULL) { 846 for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) { 847 if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) { 848 thishost = hrp; 849 break; 850 } 851 #ifdef INET6 852 /* XXX IPv4 mapped IPv6 addr consideraton */ 853 if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL && 854 (memcmp(&mapped_in6->s6_addr[12], 855 &((struct sockaddr_in *)hi->ai_addr)->sin_addr, 856 sizeof(struct in_addr)) == 0)) { 857 thishost = hrp; 858 break; 859 } 860 #endif 861 } 862 hrp = hrp->next; 863 } 864 su->su_port = port; 865 /* setup static variables as appropriate */ 866 hostname = thishost->hostname; 867 ftpuser = thishost->anonuser; 868 } 869 #endif 870 871 /* 872 * Helper function for sgetpwnam(). 873 */ 874 static char * 875 sgetsave(s) 876 char *s; 877 { 878 char *new = malloc((unsigned) strlen(s) + 1); 879 880 if (new == NULL) { 881 perror_reply(421, "Local resource failure: malloc"); 882 dologout(1); 883 /* NOTREACHED */ 884 } 885 (void) strcpy(new, s); 886 return (new); 887 } 888 889 /* 890 * Save the result of a getpwnam. Used for USER command, since 891 * the data returned must not be clobbered by any other command 892 * (e.g., globbing). 893 */ 894 static struct passwd * 895 sgetpwnam(name) 896 char *name; 897 { 898 static struct passwd save; 899 struct passwd *p; 900 901 if ((p = getpwnam(name)) == NULL) 902 return (p); 903 if (save.pw_name) { 904 free(save.pw_name); 905 free(save.pw_passwd); 906 free(save.pw_gecos); 907 free(save.pw_dir); 908 free(save.pw_shell); 909 } 910 save = *p; 911 save.pw_name = sgetsave(p->pw_name); 912 save.pw_passwd = sgetsave(p->pw_passwd); 913 save.pw_gecos = sgetsave(p->pw_gecos); 914 save.pw_dir = sgetsave(p->pw_dir); 915 save.pw_shell = sgetsave(p->pw_shell); 916 return (&save); 917 } 918 919 static int login_attempts; /* number of failed login attempts */ 920 static int askpasswd; /* had user command, ask for passwd */ 921 static char curname[MAXLOGNAME]; /* current USER name */ 922 923 /* 924 * USER command. 925 * Sets global passwd pointer pw if named account exists and is acceptable; 926 * sets askpasswd if a PASS command is expected. If logged in previously, 927 * need to reset state. If name is "ftp" or "anonymous", the name is not in 928 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 929 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 930 * requesting login privileges. Disallow anyone who does not have a standard 931 * shell as returned by getusershell(). Disallow anyone mentioned in the file 932 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 933 */ 934 void 935 user(name) 936 char *name; 937 { 938 char *cp, *shell; 939 940 if (logged_in) { 941 if (guest) { 942 reply(530, "Can't change user from guest login."); 943 return; 944 } else if (dochroot) { 945 reply(530, "Can't change user from chroot user."); 946 return; 947 } 948 end_login(); 949 } 950 951 guest = 0; 952 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 953 if (checkuser(_PATH_FTPUSERS, "ftp", 0) || 954 checkuser(_PATH_FTPUSERS, "anonymous", 0)) 955 reply(530, "User %s access denied.", name); 956 #ifdef VIRTUAL_HOSTING 957 else if ((pw = sgetpwnam(thishost->anonuser)) != NULL) { 958 #else 959 else if ((pw = sgetpwnam("ftp")) != NULL) { 960 #endif 961 guest = 1; 962 askpasswd = 1; 963 reply(331, 964 "Guest login ok, send your email address as password."); 965 } else 966 reply(530, "User %s unknown.", name); 967 if (!askpasswd && logging) 968 syslog(LOG_NOTICE, 969 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 970 return; 971 } 972 if (anon_only != 0) { 973 reply(530, "Sorry, only anonymous ftp allowed."); 974 return; 975 } 976 977 if ((pw = sgetpwnam(name))) { 978 if ((shell = pw->pw_shell) == NULL || *shell == 0) 979 shell = _PATH_BSHELL; 980 while ((cp = getusershell()) != NULL) 981 if (strcmp(cp, shell) == 0) 982 break; 983 endusershell(); 984 985 if (cp == NULL || checkuser(_PATH_FTPUSERS, name, 1)) { 986 reply(530, "User %s access denied.", name); 987 if (logging) 988 syslog(LOG_NOTICE, 989 "FTP LOGIN REFUSED FROM %s, %s", 990 remotehost, name); 991 pw = (struct passwd *) NULL; 992 return; 993 } 994 } 995 if (logging) 996 strncpy(curname, name, sizeof(curname)-1); 997 998 pwok = 0; 999 #ifdef USE_PAM 1000 /* XXX Kluge! The conversation mechanism needs to be fixed. */ 1001 #endif 1002 if (opiechallenge(&opiedata, name, opieprompt) == 0) { 1003 pwok = (pw != NULL) && 1004 opieaccessfile(remotehost) && 1005 opiealways(pw->pw_dir); 1006 reply(331, "Response to %s %s for %s.", 1007 opieprompt, pwok ? "requested" : "required", name); 1008 } else { 1009 pwok = 1; 1010 reply(331, "Password required for %s.", name); 1011 } 1012 askpasswd = 1; 1013 /* 1014 * Delay before reading passwd after first failed 1015 * attempt to slow down passwd-guessing programs. 1016 */ 1017 if (login_attempts) 1018 sleep((unsigned) login_attempts); 1019 } 1020 1021 /* 1022 * Check if a user is in the file "fname" 1023 */ 1024 static int 1025 checkuser(fname, name, pwset) 1026 char *fname; 1027 char *name; 1028 int pwset; 1029 { 1030 FILE *fd; 1031 int found = 0; 1032 char *p, line[BUFSIZ]; 1033 1034 if ((fd = fopen(fname, "r")) != NULL) { 1035 while (!found && fgets(line, sizeof(line), fd) != NULL) 1036 if ((p = strchr(line, '\n')) != NULL) { 1037 *p = '\0'; 1038 if (line[0] == '#') 1039 continue; 1040 /* 1041 * if first chr is '@', check group membership 1042 */ 1043 if (line[0] == '@') { 1044 int i = 0; 1045 struct group *grp; 1046 1047 if ((grp = getgrnam(line+1)) == NULL) 1048 continue; 1049 /* 1050 * Check user's default group 1051 */ 1052 if (pwset && grp->gr_gid == pw->pw_gid) 1053 found = 1; 1054 /* 1055 * Check supplementary groups 1056 */ 1057 while (!found && grp->gr_mem[i]) 1058 found = strcmp(name, 1059 grp->gr_mem[i++]) 1060 == 0; 1061 } 1062 /* 1063 * Otherwise, just check for username match 1064 */ 1065 else 1066 found = strcmp(line, name) == 0; 1067 } 1068 (void) fclose(fd); 1069 } 1070 return (found); 1071 } 1072 1073 /* 1074 * Terminate login as previous user, if any, resetting state; 1075 * used when USER command is given or login fails. 1076 */ 1077 static void 1078 end_login() 1079 { 1080 #ifdef USE_PAM 1081 int e; 1082 #endif 1083 1084 (void) seteuid((uid_t)0); 1085 if (logged_in) 1086 ftpd_logwtmp(ttyline, "", NULL); 1087 pw = NULL; 1088 #ifdef LOGIN_CAP 1089 setusercontext(NULL, getpwuid(0), (uid_t)0, 1090 LOGIN_SETPRIORITY|LOGIN_SETRESOURCES|LOGIN_SETUMASK); 1091 #endif 1092 #ifdef USE_PAM 1093 if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) 1094 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1095 if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS) 1096 syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e)); 1097 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) 1098 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1099 pamh = NULL; 1100 #endif 1101 logged_in = 0; 1102 guest = 0; 1103 dochroot = 0; 1104 } 1105 1106 #ifdef USE_PAM 1107 1108 /* 1109 * the following code is stolen from imap-uw PAM authentication module and 1110 * login.c 1111 */ 1112 #define COPY_STRING(s) (s ? strdup(s) : NULL) 1113 1114 struct cred_t { 1115 const char *uname; /* user name */ 1116 const char *pass; /* password */ 1117 }; 1118 typedef struct cred_t cred_t; 1119 1120 static int 1121 auth_conv(int num_msg, const struct pam_message **msg, 1122 struct pam_response **resp, void *appdata) 1123 { 1124 int i; 1125 cred_t *cred = (cred_t *) appdata; 1126 struct pam_response *reply = 1127 malloc(sizeof(struct pam_response) * num_msg); 1128 1129 for (i = 0; i < num_msg; i++) { 1130 switch (msg[i]->msg_style) { 1131 case PAM_PROMPT_ECHO_ON: /* assume want user name */ 1132 reply[i].resp_retcode = PAM_SUCCESS; 1133 reply[i].resp = COPY_STRING(cred->uname); 1134 /* PAM frees resp. */ 1135 break; 1136 case PAM_PROMPT_ECHO_OFF: /* assume want password */ 1137 reply[i].resp_retcode = PAM_SUCCESS; 1138 reply[i].resp = COPY_STRING(cred->pass); 1139 /* PAM frees resp. */ 1140 break; 1141 case PAM_TEXT_INFO: 1142 case PAM_ERROR_MSG: 1143 reply[i].resp_retcode = PAM_SUCCESS; 1144 reply[i].resp = NULL; 1145 break; 1146 default: /* unknown message style */ 1147 free(reply); 1148 return PAM_CONV_ERR; 1149 } 1150 } 1151 1152 *resp = reply; 1153 return PAM_SUCCESS; 1154 } 1155 1156 /* 1157 * Attempt to authenticate the user using PAM. Returns 0 if the user is 1158 * authenticated, or 1 if not authenticated. If some sort of PAM system 1159 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this 1160 * function returns -1. This can be used as an indication that we should 1161 * fall back to a different authentication mechanism. 1162 */ 1163 static int 1164 auth_pam(struct passwd **ppw, const char *pass) 1165 { 1166 pam_handle_t *pamh = NULL; 1167 const char *tmpl_user; 1168 const void *item; 1169 int rval; 1170 int e; 1171 cred_t auth_cred = { (*ppw)->pw_name, pass }; 1172 struct pam_conv conv = { &auth_conv, &auth_cred }; 1173 1174 e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh); 1175 if (e != PAM_SUCCESS) { 1176 syslog(LOG_ERR, "pam_start: %s", pam_strerror(pamh, e)); 1177 return -1; 1178 } 1179 1180 e = pam_set_item(pamh, PAM_RHOST, remotehost); 1181 if (e != PAM_SUCCESS) { 1182 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s", 1183 pam_strerror(pamh, e)); 1184 return -1; 1185 } 1186 1187 e = pam_authenticate(pamh, 0); 1188 switch (e) { 1189 case PAM_SUCCESS: 1190 /* 1191 * With PAM we support the concept of a "template" 1192 * user. The user enters a login name which is 1193 * authenticated by PAM, usually via a remote service 1194 * such as RADIUS or TACACS+. If authentication 1195 * succeeds, a different but related "template" name 1196 * is used for setting the credentials, shell, and 1197 * home directory. The name the user enters need only 1198 * exist on the remote authentication server, but the 1199 * template name must be present in the local password 1200 * database. 1201 * 1202 * This is supported by two various mechanisms in the 1203 * individual modules. However, from the application's 1204 * point of view, the template user is always passed 1205 * back as a changed value of the PAM_USER item. 1206 */ 1207 if ((e = pam_get_item(pamh, PAM_USER, &item)) == 1208 PAM_SUCCESS) { 1209 tmpl_user = (const char *) item; 1210 if (strcmp((*ppw)->pw_name, tmpl_user) != 0) 1211 *ppw = getpwnam(tmpl_user); 1212 } else 1213 syslog(LOG_ERR, "Couldn't get PAM_USER: %s", 1214 pam_strerror(pamh, e)); 1215 rval = 0; 1216 break; 1217 1218 case PAM_AUTH_ERR: 1219 case PAM_USER_UNKNOWN: 1220 case PAM_MAXTRIES: 1221 rval = 1; 1222 break; 1223 1224 default: 1225 syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e)); 1226 rval = -1; 1227 break; 1228 } 1229 1230 if (rval == 0) { 1231 e = pam_acct_mgmt(pamh, 0); 1232 if (e == PAM_NEW_AUTHTOK_REQD) { 1233 e = pam_chauthtok(pamh, PAM_CHANGE_EXPIRED_AUTHTOK); 1234 if (e != PAM_SUCCESS) { 1235 syslog(LOG_ERR, "pam_chauthtok: %s", pam_strerror(pamh, e)); 1236 rval = 1; 1237 } 1238 } else if (e != PAM_SUCCESS) { 1239 rval = 1; 1240 } 1241 } 1242 1243 if (rval != 0) { 1244 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1245 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1246 } 1247 pamh = NULL; 1248 } 1249 return rval; 1250 } 1251 1252 #endif /* USE_PAM */ 1253 1254 void 1255 pass(passwd) 1256 char *passwd; 1257 { 1258 int rval; 1259 FILE *fd; 1260 #ifdef LOGIN_CAP 1261 login_cap_t *lc = NULL; 1262 #endif 1263 #ifdef USE_PAM 1264 int e; 1265 #endif 1266 char *xpasswd; 1267 1268 if (logged_in || askpasswd == 0) { 1269 reply(503, "Login with USER first."); 1270 return; 1271 } 1272 askpasswd = 0; 1273 if (!guest) { /* "ftp" is only account allowed no password */ 1274 if (pw == NULL) { 1275 rval = 1; /* failure below */ 1276 goto skip; 1277 } 1278 #ifdef USE_PAM 1279 rval = auth_pam(&pw, passwd); 1280 if (rval >= 0) { 1281 opieunlock(); 1282 goto skip; 1283 } 1284 #endif 1285 if (opieverify(&opiedata, passwd) == 0) 1286 xpasswd = pw->pw_passwd; 1287 else if (pwok) { 1288 xpasswd = crypt(passwd, pw->pw_passwd); 1289 if (passwd[0] == '\0' && pw->pw_passwd[0] != '\0') 1290 xpasswd = ":"; 1291 } else { 1292 rval = 1; 1293 goto skip; 1294 } 1295 rval = strcmp(pw->pw_passwd, xpasswd); 1296 if (pw->pw_expire && time(NULL) >= pw->pw_expire) 1297 rval = 1; /* failure */ 1298 skip: 1299 /* 1300 * If rval == 1, the user failed the authentication check 1301 * above. If rval == 0, either PAM or local authentication 1302 * succeeded. 1303 */ 1304 if (rval) { 1305 reply(530, "Login incorrect."); 1306 if (logging) 1307 syslog(LOG_NOTICE, 1308 "FTP LOGIN FAILED FROM %s, %s", 1309 remotehost, curname); 1310 pw = NULL; 1311 if (login_attempts++ >= 5) { 1312 syslog(LOG_NOTICE, 1313 "repeated login failures from %s", 1314 remotehost); 1315 exit(0); 1316 } 1317 return; 1318 } 1319 } 1320 login_attempts = 0; /* this time successful */ 1321 if (setegid((gid_t)pw->pw_gid) < 0) { 1322 reply(550, "Can't set gid."); 1323 return; 1324 } 1325 /* May be overridden by login.conf */ 1326 (void) umask(defumask); 1327 #ifdef LOGIN_CAP 1328 if ((lc = login_getpwclass(pw)) != NULL) { 1329 char remote_ip[MAXHOSTNAMELEN]; 1330 1331 getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1332 remote_ip, sizeof(remote_ip) - 1, NULL, 0, 1333 NI_NUMERICHOST|NI_WITHSCOPEID); 1334 remote_ip[sizeof(remote_ip) - 1] = 0; 1335 if (!auth_hostok(lc, remotehost, remote_ip)) { 1336 syslog(LOG_INFO|LOG_AUTH, 1337 "FTP LOGIN FAILED (HOST) as %s: permission denied.", 1338 pw->pw_name); 1339 reply(530, "Permission denied.\n"); 1340 pw = NULL; 1341 return; 1342 } 1343 if (!auth_timeok(lc, time(NULL))) { 1344 reply(530, "Login not available right now.\n"); 1345 pw = NULL; 1346 return; 1347 } 1348 } 1349 setusercontext(lc, pw, (uid_t)0, 1350 LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY| 1351 LOGIN_SETRESOURCES|LOGIN_SETUMASK); 1352 #else 1353 setlogin(pw->pw_name); 1354 (void) initgroups(pw->pw_name, pw->pw_gid); 1355 #endif 1356 1357 #ifdef USE_PAM 1358 if (pamh) { 1359 if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) { 1360 syslog(LOG_ERR, "pam_open_session: %s", pam_strerror(pamh, e)); 1361 } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS) { 1362 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1363 } 1364 } 1365 #endif 1366 1367 /* open wtmp before chroot */ 1368 ftpd_logwtmp(ttyline, pw->pw_name, (struct sockaddr *)&his_addr); 1369 logged_in = 1; 1370 1371 if (guest && stats && statfd < 0) 1372 #ifdef VIRTUAL_HOSTING 1373 if ((statfd = open(thishost->statfile, O_WRONLY|O_APPEND)) < 0) 1374 #else 1375 if ((statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND)) < 0) 1376 #endif 1377 stats = 0; 1378 1379 dochroot = 1380 #ifdef LOGIN_CAP /* Allow login.conf configuration as well */ 1381 login_getcapbool(lc, "ftp-chroot", 0) || 1382 #endif 1383 checkuser(_PATH_FTPCHROOT, pw->pw_name, 1); 1384 if (guest) { 1385 /* 1386 * We MUST do a chdir() after the chroot. Otherwise 1387 * the old current directory will be accessible as "." 1388 * outside the new root! 1389 */ 1390 if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) { 1391 reply(550, "Can't set guest privileges."); 1392 goto bad; 1393 } 1394 } else if (dochroot) { 1395 if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) { 1396 reply(550, "Can't change root."); 1397 goto bad; 1398 } 1399 } else if (chdir(pw->pw_dir) < 0) { 1400 if (chdir("/") < 0) { 1401 reply(530, "User %s: can't change directory to %s.", 1402 pw->pw_name, pw->pw_dir); 1403 goto bad; 1404 } else 1405 lreply(230, "No directory! Logging in with home=/"); 1406 } 1407 if (seteuid((uid_t)pw->pw_uid) < 0) { 1408 reply(550, "Can't set uid."); 1409 goto bad; 1410 } 1411 1412 /* 1413 * Display a login message, if it exists. 1414 * N.B. reply(230,) must follow the message. 1415 */ 1416 #ifdef VIRTUAL_HOSTING 1417 if ((fd = fopen(thishost->loginmsg, "r")) != NULL) { 1418 #else 1419 if ((fd = fopen(_PATH_FTPLOGINMESG, "r")) != NULL) { 1420 #endif 1421 char *cp, line[LINE_MAX]; 1422 1423 while (fgets(line, sizeof(line), fd) != NULL) { 1424 if ((cp = strchr(line, '\n')) != NULL) 1425 *cp = '\0'; 1426 lreply(230, "%s", line); 1427 } 1428 (void) fflush(stdout); 1429 (void) fclose(fd); 1430 } 1431 if (guest) { 1432 if (ident != NULL) 1433 free(ident); 1434 ident = strdup(passwd); 1435 if (ident == NULL) 1436 fatalerror("Ran out of memory."); 1437 1438 reply(230, "Guest login ok, access restrictions apply."); 1439 #ifdef SETPROCTITLE 1440 #ifdef VIRTUAL_HOSTING 1441 if (thishost != firsthost) 1442 snprintf(proctitle, sizeof(proctitle), 1443 "%s: anonymous(%s)/%s", remotehost, hostname, 1444 passwd); 1445 else 1446 #endif 1447 snprintf(proctitle, sizeof(proctitle), 1448 "%s: anonymous/%s", remotehost, passwd); 1449 setproctitle("%s", proctitle); 1450 #endif /* SETPROCTITLE */ 1451 if (logging) 1452 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1453 remotehost, passwd); 1454 } else { 1455 if (dochroot) 1456 reply(230, "User %s logged in, " 1457 "access restrictions apply.", pw->pw_name); 1458 else 1459 reply(230, "User %s logged in.", pw->pw_name); 1460 1461 #ifdef SETPROCTITLE 1462 snprintf(proctitle, sizeof(proctitle), 1463 "%s: user/%s", remotehost, pw->pw_name); 1464 setproctitle("%s", proctitle); 1465 #endif /* SETPROCTITLE */ 1466 if (logging) 1467 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1468 remotehost, pw->pw_name); 1469 } 1470 #ifdef LOGIN_CAP 1471 login_close(lc); 1472 #endif 1473 return; 1474 bad: 1475 /* Forget all about it... */ 1476 #ifdef LOGIN_CAP 1477 login_close(lc); 1478 #endif 1479 end_login(); 1480 } 1481 1482 void 1483 retrieve(cmd, name) 1484 char *cmd, *name; 1485 { 1486 FILE *fin, *dout; 1487 struct stat st; 1488 int (*closefunc) __P((FILE *)); 1489 time_t start; 1490 1491 if (cmd == 0) { 1492 fin = fopen(name, "r"), closefunc = fclose; 1493 st.st_size = 0; 1494 } else { 1495 char line[BUFSIZ]; 1496 1497 (void) snprintf(line, sizeof(line), cmd, name), name = line; 1498 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1499 st.st_size = -1; 1500 st.st_blksize = BUFSIZ; 1501 } 1502 if (fin == NULL) { 1503 if (errno != 0) { 1504 perror_reply(550, name); 1505 if (cmd == 0) { 1506 LOGCMD("get", name); 1507 } 1508 } 1509 return; 1510 } 1511 byte_count = -1; 1512 if (cmd == 0 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1513 reply(550, "%s: not a plain file.", name); 1514 goto done; 1515 } 1516 if (restart_point) { 1517 if (type == TYPE_A) { 1518 off_t i, n; 1519 int c; 1520 1521 n = restart_point; 1522 i = 0; 1523 while (i++ < n) { 1524 if ((c=getc(fin)) == EOF) { 1525 perror_reply(550, name); 1526 goto done; 1527 } 1528 if (c == '\n') 1529 i++; 1530 } 1531 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 1532 perror_reply(550, name); 1533 goto done; 1534 } 1535 } 1536 dout = dataconn(name, st.st_size, "w"); 1537 if (dout == NULL) 1538 goto done; 1539 time(&start); 1540 send_data(fin, dout, st.st_blksize, st.st_size, 1541 restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode)); 1542 if (cmd == 0 && guest && stats) 1543 logxfer(name, st.st_size, start); 1544 (void) fclose(dout); 1545 data = -1; 1546 pdata = -1; 1547 done: 1548 if (cmd == 0) 1549 LOGBYTES("get", name, byte_count); 1550 (*closefunc)(fin); 1551 } 1552 1553 void 1554 store(name, mode, unique) 1555 char *name, *mode; 1556 int unique; 1557 { 1558 FILE *fout, *din; 1559 struct stat st; 1560 int (*closefunc) __P((FILE *)); 1561 1562 if ((unique || guest) && stat(name, &st) == 0 && 1563 (name = gunique(name)) == NULL) { 1564 LOGCMD(*mode == 'w' ? "put" : "append", name); 1565 return; 1566 } 1567 1568 if (restart_point) 1569 mode = "r+"; 1570 fout = fopen(name, mode); 1571 closefunc = fclose; 1572 if (fout == NULL) { 1573 perror_reply(553, name); 1574 LOGCMD(*mode == 'w' ? "put" : "append", name); 1575 return; 1576 } 1577 byte_count = -1; 1578 if (restart_point) { 1579 if (type == TYPE_A) { 1580 off_t i, n; 1581 int c; 1582 1583 n = restart_point; 1584 i = 0; 1585 while (i++ < n) { 1586 if ((c=getc(fout)) == EOF) { 1587 perror_reply(550, name); 1588 goto done; 1589 } 1590 if (c == '\n') 1591 i++; 1592 } 1593 /* 1594 * We must do this seek to "current" position 1595 * because we are changing from reading to 1596 * writing. 1597 */ 1598 if (fseeko(fout, (off_t)0, SEEK_CUR) < 0) { 1599 perror_reply(550, name); 1600 goto done; 1601 } 1602 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 1603 perror_reply(550, name); 1604 goto done; 1605 } 1606 } 1607 din = dataconn(name, (off_t)-1, "r"); 1608 if (din == NULL) 1609 goto done; 1610 if (receive_data(din, fout) == 0) { 1611 if (unique) 1612 reply(226, "Transfer complete (unique file name:%s).", 1613 name); 1614 else 1615 reply(226, "Transfer complete."); 1616 } 1617 (void) fclose(din); 1618 data = -1; 1619 pdata = -1; 1620 done: 1621 LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count); 1622 (*closefunc)(fout); 1623 } 1624 1625 static FILE * 1626 getdatasock(mode) 1627 char *mode; 1628 { 1629 int on = 1, s, t, tries; 1630 1631 if (data >= 0) 1632 return (fdopen(data, mode)); 1633 (void) seteuid((uid_t)0); 1634 1635 s = socket(data_dest.su_family, SOCK_STREAM, 0); 1636 if (s < 0) 1637 goto bad; 1638 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1639 (char *) &on, sizeof(on)) < 0) 1640 goto bad; 1641 /* anchor socket to avoid multi-homing problems */ 1642 data_source = ctrl_addr; 1643 data_source.su_port = htons(20); /* ftp-data port */ 1644 for (tries = 1; ; tries++) { 1645 if (bind(s, (struct sockaddr *)&data_source, 1646 data_source.su_len) >= 0) 1647 break; 1648 if (errno != EADDRINUSE || tries > 10) 1649 goto bad; 1650 sleep(tries); 1651 } 1652 (void) seteuid((uid_t)pw->pw_uid); 1653 #ifdef IP_TOS 1654 if (data_source.su_family == AF_INET) 1655 { 1656 on = IPTOS_THROUGHPUT; 1657 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0) 1658 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1659 } 1660 #endif 1661 #ifdef TCP_NOPUSH 1662 /* 1663 * Turn off push flag to keep sender TCP from sending short packets 1664 * at the boundaries of each write(). Should probably do a SO_SNDBUF 1665 * to set the send buffer size as well, but that may not be desirable 1666 * in heavy-load situations. 1667 */ 1668 on = 1; 1669 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, (char *)&on, sizeof on) < 0) 1670 syslog(LOG_WARNING, "setsockopt (TCP_NOPUSH): %m"); 1671 #endif 1672 #ifdef SO_SNDBUF 1673 on = 65536; 1674 if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, (char *)&on, sizeof on) < 0) 1675 syslog(LOG_WARNING, "setsockopt (SO_SNDBUF): %m"); 1676 #endif 1677 1678 return (fdopen(s, mode)); 1679 bad: 1680 /* Return the real value of errno (close may change it) */ 1681 t = errno; 1682 (void) seteuid((uid_t)pw->pw_uid); 1683 (void) close(s); 1684 errno = t; 1685 return (NULL); 1686 } 1687 1688 static FILE * 1689 dataconn(name, size, mode) 1690 char *name; 1691 off_t size; 1692 char *mode; 1693 { 1694 char sizebuf[32]; 1695 FILE *file; 1696 int retry = 0, tos; 1697 1698 file_size = size; 1699 byte_count = 0; 1700 if (size != (off_t) -1) 1701 (void) snprintf(sizebuf, sizeof(sizebuf), " (%qd bytes)", size); 1702 else 1703 *sizebuf = '\0'; 1704 if (pdata >= 0) { 1705 union sockunion from; 1706 int flags; 1707 int s, fromlen = ctrl_addr.su_len; 1708 struct timeval timeout; 1709 fd_set set; 1710 1711 FD_ZERO(&set); 1712 FD_SET(pdata, &set); 1713 1714 timeout.tv_usec = 0; 1715 timeout.tv_sec = 120; 1716 1717 /* 1718 * Granted a socket is in the blocking I/O mode, 1719 * accept() will block after a successful select() 1720 * if the selected connection dies in between. 1721 * Therefore set the non-blocking I/O flag here. 1722 */ 1723 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1724 fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1) 1725 goto pdata_err; 1726 if (select(pdata+1, &set, (fd_set *) 0, (fd_set *) 0, &timeout) <= 0 || 1727 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0) 1728 goto pdata_err; 1729 (void) close(pdata); 1730 pdata = s; 1731 /* 1732 * Unset the blocking I/O flag on the child socket 1733 * again so stdio can work on it. 1734 */ 1735 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1736 fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1) 1737 goto pdata_err; 1738 #ifdef IP_TOS 1739 if (from.su_family == AF_INET) 1740 { 1741 tos = IPTOS_THROUGHPUT; 1742 (void) setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&tos, 1743 sizeof(int)); 1744 } 1745 #endif 1746 reply(150, "Opening %s mode data connection for '%s'%s.", 1747 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1748 return (fdopen(pdata, mode)); 1749 pdata_err: 1750 reply(425, "Can't open data connection."); 1751 (void) close(pdata); 1752 pdata = -1; 1753 return (NULL); 1754 } 1755 if (data >= 0) { 1756 reply(125, "Using existing data connection for '%s'%s.", 1757 name, sizebuf); 1758 usedefault = 1; 1759 return (fdopen(data, mode)); 1760 } 1761 if (usedefault) 1762 data_dest = his_addr; 1763 usedefault = 1; 1764 file = getdatasock(mode); 1765 if (file == NULL) { 1766 char hostbuf[BUFSIZ], portbuf[BUFSIZ]; 1767 getnameinfo((struct sockaddr *)&data_source, 1768 data_source.su_len, hostbuf, sizeof(hostbuf) - 1, 1769 portbuf, sizeof(portbuf), 1770 NI_NUMERICHOST|NI_NUMERICSERV|NI_WITHSCOPEID); 1771 reply(425, "Can't create data socket (%s,%s): %s.", 1772 hostbuf, portbuf, strerror(errno)); 1773 return (NULL); 1774 } 1775 data = fileno(file); 1776 while (connect(data, (struct sockaddr *)&data_dest, 1777 data_dest.su_len) < 0) { 1778 if (errno == EADDRINUSE && retry < swaitmax) { 1779 sleep((unsigned) swaitint); 1780 retry += swaitint; 1781 continue; 1782 } 1783 perror_reply(425, "Can't build data connection"); 1784 (void) fclose(file); 1785 data = -1; 1786 return (NULL); 1787 } 1788 reply(150, "Opening %s mode data connection for '%s'%s.", 1789 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1790 return (file); 1791 } 1792 1793 /* 1794 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1795 * encapsulation of the data subject to Mode, Structure, and Type. 1796 * 1797 * NB: Form isn't handled. 1798 */ 1799 static int 1800 send_data(instr, outstr, blksize, filesize, isreg) 1801 FILE *instr, *outstr; 1802 off_t blksize; 1803 off_t filesize; 1804 int isreg; 1805 { 1806 int c, filefd, netfd; 1807 char *buf; 1808 size_t len; 1809 off_t cnt; 1810 1811 transflag++; 1812 switch (type) { 1813 1814 case TYPE_A: 1815 while ((c = getc(instr)) != EOF) { 1816 if (recvurg) 1817 goto got_oob; 1818 byte_count++; 1819 if (c == '\n') { 1820 if (ferror(outstr)) 1821 goto data_err; 1822 (void) putc('\r', outstr); 1823 } 1824 (void) putc(c, outstr); 1825 } 1826 if (recvurg) 1827 goto got_oob; 1828 fflush(outstr); 1829 transflag = 0; 1830 if (ferror(instr)) 1831 goto file_err; 1832 if (ferror(outstr)) 1833 goto data_err; 1834 reply(226, "Transfer complete."); 1835 return (0); 1836 1837 case TYPE_I: 1838 case TYPE_L: 1839 /* 1840 * isreg is only set if we are not doing restart and we 1841 * are sending a regular file 1842 */ 1843 netfd = fileno(outstr); 1844 filefd = fileno(instr); 1845 1846 if (isreg) { 1847 1848 off_t offset; 1849 int err; 1850 1851 len = filesize; 1852 err = cnt = offset = 0; 1853 1854 while (err != -1 && cnt < filesize) { 1855 err = sendfile(filefd, netfd, offset, len, 1856 (struct sf_hdtr *) NULL, &cnt, 0); 1857 if (recvurg) 1858 goto got_oob; 1859 byte_count += cnt; 1860 offset += cnt; 1861 len -= cnt; 1862 1863 if (err == -1) { 1864 if (!cnt) 1865 goto oldway; 1866 1867 goto data_err; 1868 } 1869 } 1870 1871 reply(226, "Transfer complete."); 1872 return (0); 1873 } 1874 1875 oldway: 1876 if ((buf = malloc((u_int)blksize)) == NULL) { 1877 transflag = 0; 1878 perror_reply(451, "Local resource failure: malloc"); 1879 return (-1); 1880 } 1881 1882 while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 && 1883 write(netfd, buf, cnt) == cnt) 1884 byte_count += cnt; 1885 transflag = 0; 1886 (void)free(buf); 1887 if (cnt != 0) { 1888 if (cnt < 0) 1889 goto file_err; 1890 goto data_err; 1891 } 1892 reply(226, "Transfer complete."); 1893 return (0); 1894 default: 1895 transflag = 0; 1896 reply(550, "Unimplemented TYPE %d in send_data", type); 1897 return (-1); 1898 } 1899 1900 data_err: 1901 transflag = 0; 1902 perror_reply(426, "Data connection"); 1903 return (-1); 1904 1905 file_err: 1906 transflag = 0; 1907 perror_reply(551, "Error on input file"); 1908 return (-1); 1909 1910 got_oob: 1911 myoob(); 1912 recvurg = 0; 1913 transflag = 0; 1914 return (-1); 1915 } 1916 1917 /* 1918 * Transfer data from peer to "outstr" using the appropriate encapulation of 1919 * the data subject to Mode, Structure, and Type. 1920 * 1921 * N.B.: Form isn't handled. 1922 */ 1923 static int 1924 receive_data(instr, outstr) 1925 FILE *instr, *outstr; 1926 { 1927 int c; 1928 int cnt, bare_lfs; 1929 char buf[BUFSIZ]; 1930 1931 transflag++; 1932 bare_lfs = 0; 1933 1934 switch (type) { 1935 1936 case TYPE_I: 1937 case TYPE_L: 1938 while ((cnt = read(fileno(instr), buf, sizeof(buf))) > 0) { 1939 if (recvurg) 1940 goto got_oob; 1941 if (write(fileno(outstr), buf, cnt) != cnt) 1942 goto file_err; 1943 byte_count += cnt; 1944 } 1945 if (recvurg) 1946 goto got_oob; 1947 if (cnt < 0) 1948 goto data_err; 1949 transflag = 0; 1950 return (0); 1951 1952 case TYPE_E: 1953 reply(553, "TYPE E not implemented."); 1954 transflag = 0; 1955 return (-1); 1956 1957 case TYPE_A: 1958 while ((c = getc(instr)) != EOF) { 1959 if (recvurg) 1960 goto got_oob; 1961 byte_count++; 1962 if (c == '\n') 1963 bare_lfs++; 1964 while (c == '\r') { 1965 if (ferror(outstr)) 1966 goto data_err; 1967 if ((c = getc(instr)) != '\n') { 1968 (void) putc ('\r', outstr); 1969 if (c == '\0' || c == EOF) 1970 goto contin2; 1971 } 1972 } 1973 (void) putc(c, outstr); 1974 contin2: ; 1975 } 1976 if (recvurg) 1977 goto got_oob; 1978 fflush(outstr); 1979 if (ferror(instr)) 1980 goto data_err; 1981 if (ferror(outstr)) 1982 goto file_err; 1983 transflag = 0; 1984 if (bare_lfs) { 1985 lreply(226, 1986 "WARNING! %d bare linefeeds received in ASCII mode", 1987 bare_lfs); 1988 (void)printf(" File may not have transferred correctly.\r\n"); 1989 } 1990 return (0); 1991 default: 1992 reply(550, "Unimplemented TYPE %d in receive_data", type); 1993 transflag = 0; 1994 return (-1); 1995 } 1996 1997 data_err: 1998 transflag = 0; 1999 perror_reply(426, "Data Connection"); 2000 return (-1); 2001 2002 file_err: 2003 transflag = 0; 2004 perror_reply(452, "Error writing file"); 2005 return (-1); 2006 2007 got_oob: 2008 myoob(); 2009 recvurg = 0; 2010 transflag = 0; 2011 return (-1); 2012 } 2013 2014 void 2015 statfilecmd(filename) 2016 char *filename; 2017 { 2018 FILE *fin; 2019 int c; 2020 char line[LINE_MAX]; 2021 2022 (void)snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename); 2023 fin = ftpd_popen(line, "r"); 2024 lreply(211, "status of %s:", filename); 2025 while ((c = getc(fin)) != EOF) { 2026 if (c == '\n') { 2027 if (ferror(stdout)){ 2028 perror_reply(421, "control connection"); 2029 (void) ftpd_pclose(fin); 2030 dologout(1); 2031 /* NOTREACHED */ 2032 } 2033 if (ferror(fin)) { 2034 perror_reply(551, filename); 2035 (void) ftpd_pclose(fin); 2036 return; 2037 } 2038 (void) putc('\r', stdout); 2039 } 2040 (void) putc(c, stdout); 2041 } 2042 (void) ftpd_pclose(fin); 2043 reply(211, "End of Status"); 2044 } 2045 2046 void 2047 statcmd() 2048 { 2049 union sockunion *su; 2050 u_char *a, *p; 2051 char hname[INET6_ADDRSTRLEN]; 2052 int ispassive; 2053 2054 lreply(211, "%s FTP server status:", hostname, version); 2055 printf(" %s\r\n", version); 2056 printf(" Connected to %s", remotehost); 2057 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 2058 hname, sizeof(hname) - 1, NULL, 0, 2059 NI_NUMERICHOST|NI_WITHSCOPEID)) { 2060 if (strcmp(hname, remotehost) != 0) 2061 printf(" (%s)", hname); 2062 } 2063 printf("\r\n"); 2064 if (logged_in) { 2065 if (guest) 2066 printf(" Logged in anonymously\r\n"); 2067 else 2068 printf(" Logged in as %s\r\n", pw->pw_name); 2069 } else if (askpasswd) 2070 printf(" Waiting for password\r\n"); 2071 else 2072 printf(" Waiting for user name\r\n"); 2073 printf(" TYPE: %s", typenames[type]); 2074 if (type == TYPE_A || type == TYPE_E) 2075 printf(", FORM: %s", formnames[form]); 2076 if (type == TYPE_L) 2077 #if NBBY == 8 2078 printf(" %d", NBBY); 2079 #else 2080 printf(" %d", bytesize); /* need definition! */ 2081 #endif 2082 printf("; STRUcture: %s; transfer MODE: %s\r\n", 2083 strunames[stru], modenames[mode]); 2084 if (data != -1) 2085 printf(" Data connection open\r\n"); 2086 else if (pdata != -1) { 2087 ispassive = 1; 2088 su = &pasv_addr; 2089 goto printaddr; 2090 } else if (usedefault == 0) { 2091 ispassive = 0; 2092 su = &data_dest; 2093 printaddr: 2094 #define UC(b) (((int) b) & 0xff) 2095 if (epsvall) { 2096 printf(" EPSV only mode (EPSV ALL)\r\n"); 2097 goto epsvonly; 2098 } 2099 2100 /* PORT/PASV */ 2101 if (su->su_family == AF_INET) { 2102 a = (u_char *) &su->su_sin.sin_addr; 2103 p = (u_char *) &su->su_sin.sin_port; 2104 printf(" %s (%d,%d,%d,%d,%d,%d)\r\n", 2105 ispassive ? "PASV" : "PORT", 2106 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2107 UC(p[0]), UC(p[1])); 2108 } 2109 2110 /* LPRT/LPSV */ 2111 { 2112 int alen, af, i; 2113 2114 switch (su->su_family) { 2115 case AF_INET: 2116 a = (u_char *) &su->su_sin.sin_addr; 2117 p = (u_char *) &su->su_sin.sin_port; 2118 alen = sizeof(su->su_sin.sin_addr); 2119 af = 4; 2120 break; 2121 case AF_INET6: 2122 a = (u_char *) &su->su_sin6.sin6_addr; 2123 p = (u_char *) &su->su_sin6.sin6_port; 2124 alen = sizeof(su->su_sin6.sin6_addr); 2125 af = 6; 2126 break; 2127 default: 2128 af = 0; 2129 break; 2130 } 2131 if (af) { 2132 printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT", 2133 af, alen); 2134 for (i = 0; i < alen; i++) 2135 printf("%d,", UC(a[i])); 2136 printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 2137 } 2138 } 2139 2140 epsvonly:; 2141 /* EPRT/EPSV */ 2142 { 2143 int af; 2144 2145 switch (su->su_family) { 2146 case AF_INET: 2147 af = 1; 2148 break; 2149 case AF_INET6: 2150 af = 2; 2151 break; 2152 default: 2153 af = 0; 2154 break; 2155 } 2156 if (af) { 2157 if (!getnameinfo((struct sockaddr *)su, su->su_len, 2158 hname, sizeof(hname) - 1, NULL, 0, 2159 NI_NUMERICHOST)) { 2160 printf(" %s |%d|%s|%d|\r\n", 2161 ispassive ? "EPSV" : "EPRT", 2162 af, hname, htons(su->su_port)); 2163 } 2164 } 2165 } 2166 #undef UC 2167 } else 2168 printf(" No data connection\r\n"); 2169 reply(211, "End of status"); 2170 } 2171 2172 void 2173 fatalerror(s) 2174 char *s; 2175 { 2176 2177 reply(451, "Error in server: %s\n", s); 2178 reply(221, "Closing connection due to server error."); 2179 dologout(0); 2180 /* NOTREACHED */ 2181 } 2182 2183 void 2184 #if __STDC__ 2185 reply(int n, const char *fmt, ...) 2186 #else 2187 reply(n, fmt, va_alist) 2188 int n; 2189 char *fmt; 2190 va_dcl 2191 #endif 2192 { 2193 va_list ap; 2194 #if __STDC__ 2195 va_start(ap, fmt); 2196 #else 2197 va_start(ap); 2198 #endif 2199 (void)printf("%d ", n); 2200 (void)vprintf(fmt, ap); 2201 (void)printf("\r\n"); 2202 (void)fflush(stdout); 2203 if (ftpdebug) { 2204 syslog(LOG_DEBUG, "<--- %d ", n); 2205 vsyslog(LOG_DEBUG, fmt, ap); 2206 } 2207 } 2208 2209 void 2210 #if __STDC__ 2211 lreply(int n, const char *fmt, ...) 2212 #else 2213 lreply(n, fmt, va_alist) 2214 int n; 2215 char *fmt; 2216 va_dcl 2217 #endif 2218 { 2219 va_list ap; 2220 #if __STDC__ 2221 va_start(ap, fmt); 2222 #else 2223 va_start(ap); 2224 #endif 2225 (void)printf("%d- ", n); 2226 (void)vprintf(fmt, ap); 2227 (void)printf("\r\n"); 2228 (void)fflush(stdout); 2229 if (ftpdebug) { 2230 syslog(LOG_DEBUG, "<--- %d- ", n); 2231 vsyslog(LOG_DEBUG, fmt, ap); 2232 } 2233 } 2234 2235 static void 2236 ack(s) 2237 char *s; 2238 { 2239 2240 reply(250, "%s command successful.", s); 2241 } 2242 2243 void 2244 nack(s) 2245 char *s; 2246 { 2247 2248 reply(502, "%s command not implemented.", s); 2249 } 2250 2251 /* ARGSUSED */ 2252 void 2253 yyerror(s) 2254 char *s; 2255 { 2256 char *cp; 2257 2258 if ((cp = strchr(cbuf,'\n'))) 2259 *cp = '\0'; 2260 reply(500, "'%s': command not understood.", cbuf); 2261 } 2262 2263 void 2264 delete(name) 2265 char *name; 2266 { 2267 struct stat st; 2268 2269 LOGCMD("delete", name); 2270 if (stat(name, &st) < 0) { 2271 perror_reply(550, name); 2272 return; 2273 } 2274 if ((st.st_mode&S_IFMT) == S_IFDIR) { 2275 if (rmdir(name) < 0) { 2276 perror_reply(550, name); 2277 return; 2278 } 2279 goto done; 2280 } 2281 if (unlink(name) < 0) { 2282 perror_reply(550, name); 2283 return; 2284 } 2285 done: 2286 ack("DELE"); 2287 } 2288 2289 void 2290 cwd(path) 2291 char *path; 2292 { 2293 2294 if (chdir(path) < 0) 2295 perror_reply(550, path); 2296 else 2297 ack("CWD"); 2298 } 2299 2300 void 2301 makedir(name) 2302 char *name; 2303 { 2304 2305 LOGCMD("mkdir", name); 2306 if (mkdir(name, 0777) < 0) 2307 perror_reply(550, name); 2308 else 2309 reply(257, "MKD command successful."); 2310 } 2311 2312 void 2313 removedir(name) 2314 char *name; 2315 { 2316 2317 LOGCMD("rmdir", name); 2318 if (rmdir(name) < 0) 2319 perror_reply(550, name); 2320 else 2321 ack("RMD"); 2322 } 2323 2324 void 2325 pwd() 2326 { 2327 char path[MAXPATHLEN + 1]; 2328 2329 if (getwd(path) == (char *)NULL) 2330 reply(550, "%s.", path); 2331 else 2332 reply(257, "\"%s\" is current directory.", path); 2333 } 2334 2335 char * 2336 renamefrom(name) 2337 char *name; 2338 { 2339 struct stat st; 2340 2341 if (stat(name, &st) < 0) { 2342 perror_reply(550, name); 2343 return ((char *)0); 2344 } 2345 reply(350, "File exists, ready for destination name"); 2346 return (name); 2347 } 2348 2349 void 2350 renamecmd(from, to) 2351 char *from, *to; 2352 { 2353 struct stat st; 2354 2355 LOGCMD2("rename", from, to); 2356 2357 if (guest && (stat(to, &st) == 0)) { 2358 reply(550, "%s: permission denied", to); 2359 return; 2360 } 2361 2362 if (rename(from, to) < 0) 2363 perror_reply(550, "rename"); 2364 else 2365 ack("RNTO"); 2366 } 2367 2368 static void 2369 dolog(who) 2370 struct sockaddr *who; 2371 { 2372 int error; 2373 2374 realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len); 2375 2376 #ifdef SETPROCTITLE 2377 #ifdef VIRTUAL_HOSTING 2378 if (thishost != firsthost) 2379 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)", 2380 remotehost, hostname); 2381 else 2382 #endif 2383 snprintf(proctitle, sizeof(proctitle), "%s: connected", 2384 remotehost); 2385 setproctitle("%s", proctitle); 2386 #endif /* SETPROCTITLE */ 2387 2388 if (logging) { 2389 #ifdef VIRTUAL_HOSTING 2390 if (thishost != firsthost) 2391 syslog(LOG_INFO, "connection from %s (to %s)", 2392 remotehost, hostname); 2393 else 2394 #endif 2395 { 2396 char who_name[MAXHOSTNAMELEN]; 2397 2398 error = getnameinfo(who, who->sa_len, 2399 who_name, sizeof(who_name) - 1, 2400 NULL, 0, 2401 NI_NUMERICHOST|NI_WITHSCOPEID); 2402 syslog(LOG_INFO, "connection from %s (%s)", remotehost, 2403 error == 0 ? who_name : ""); 2404 } 2405 } 2406 } 2407 2408 /* 2409 * Record logout in wtmp file 2410 * and exit with supplied status. 2411 */ 2412 void 2413 dologout(status) 2414 int status; 2415 { 2416 /* 2417 * Prevent reception of SIGURG from resulting in a resumption 2418 * back to the main program loop. 2419 */ 2420 transflag = 0; 2421 2422 if (logged_in) { 2423 (void) seteuid((uid_t)0); 2424 ftpd_logwtmp(ttyline, "", NULL); 2425 } 2426 /* beware of flushing buffers after a SIGPIPE */ 2427 _exit(status); 2428 } 2429 2430 static void 2431 sigurg(signo) 2432 int signo; 2433 { 2434 2435 recvurg = 1; 2436 } 2437 2438 static void 2439 myoob() 2440 { 2441 char *cp; 2442 2443 /* only process if transfer occurring */ 2444 if (!transflag) 2445 return; 2446 cp = tmpline; 2447 if (getline(cp, 7, stdin) == NULL) { 2448 reply(221, "You could at least say goodbye."); 2449 dologout(0); 2450 } 2451 upper(cp); 2452 if (strcmp(cp, "ABOR\r\n") == 0) { 2453 tmpline[0] = '\0'; 2454 reply(426, "Transfer aborted. Data connection closed."); 2455 reply(226, "Abort successful"); 2456 } 2457 if (strcmp(cp, "STAT\r\n") == 0) { 2458 tmpline[0] = '\0'; 2459 if (file_size != (off_t) -1) 2460 reply(213, "Status: %qd of %qd bytes transferred", 2461 byte_count, file_size); 2462 else 2463 reply(213, "Status: %qd bytes transferred", byte_count); 2464 } 2465 } 2466 2467 /* 2468 * Note: a response of 425 is not mentioned as a possible response to 2469 * the PASV command in RFC959. However, it has been blessed as 2470 * a legitimate response by Jon Postel in a telephone conversation 2471 * with Rick Adams on 25 Jan 89. 2472 */ 2473 void 2474 passive() 2475 { 2476 int len; 2477 char *p, *a; 2478 2479 if (pdata >= 0) /* close old port if one set */ 2480 close(pdata); 2481 2482 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2483 if (pdata < 0) { 2484 perror_reply(425, "Can't open passive connection"); 2485 return; 2486 } 2487 2488 (void) seteuid((uid_t)0); 2489 2490 #ifdef IP_PORTRANGE 2491 if (ctrl_addr.su_family == AF_INET) { 2492 int on = restricted_data_ports ? IP_PORTRANGE_HIGH 2493 : IP_PORTRANGE_DEFAULT; 2494 2495 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2496 (char *)&on, sizeof(on)) < 0) 2497 goto pasv_error; 2498 } 2499 #endif 2500 #ifdef IPV6_PORTRANGE 2501 if (ctrl_addr.su_family == AF_INET6) { 2502 int on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2503 : IPV6_PORTRANGE_DEFAULT; 2504 2505 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2506 (char *)&on, sizeof(on)) < 0) 2507 goto pasv_error; 2508 } 2509 #endif 2510 2511 pasv_addr = ctrl_addr; 2512 pasv_addr.su_port = 0; 2513 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2514 goto pasv_error; 2515 2516 (void) seteuid((uid_t)pw->pw_uid); 2517 2518 len = sizeof(pasv_addr); 2519 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2520 goto pasv_error; 2521 if (listen(pdata, 1) < 0) 2522 goto pasv_error; 2523 if (pasv_addr.su_family == AF_INET) 2524 a = (char *) &pasv_addr.su_sin.sin_addr; 2525 else if (pasv_addr.su_family == AF_INET6 && 2526 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) 2527 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2528 else 2529 goto pasv_error; 2530 2531 p = (char *) &pasv_addr.su_port; 2532 2533 #define UC(b) (((int) b) & 0xff) 2534 2535 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2536 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2537 return; 2538 2539 pasv_error: 2540 (void) seteuid((uid_t)pw->pw_uid); 2541 (void) close(pdata); 2542 pdata = -1; 2543 perror_reply(425, "Can't open passive connection"); 2544 return; 2545 } 2546 2547 /* 2548 * Long Passive defined in RFC 1639. 2549 * 228 Entering Long Passive Mode 2550 * (af, hal, h1, h2, h3,..., pal, p1, p2...) 2551 */ 2552 2553 void 2554 long_passive(cmd, pf) 2555 char *cmd; 2556 int pf; 2557 { 2558 int len; 2559 char *p, *a; 2560 2561 if (pdata >= 0) /* close old port if one set */ 2562 close(pdata); 2563 2564 if (pf != PF_UNSPEC) { 2565 if (ctrl_addr.su_family != pf) { 2566 switch (ctrl_addr.su_family) { 2567 case AF_INET: 2568 pf = 1; 2569 break; 2570 case AF_INET6: 2571 pf = 2; 2572 break; 2573 default: 2574 pf = 0; 2575 break; 2576 } 2577 /* 2578 * XXX 2579 * only EPRT/EPSV ready clients will understand this 2580 */ 2581 if (strcmp(cmd, "EPSV") == 0 && pf) { 2582 reply(522, "Network protocol mismatch, " 2583 "use (%d)", pf); 2584 } else 2585 reply(501, "Network protocol mismatch"); /*XXX*/ 2586 2587 return; 2588 } 2589 } 2590 2591 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2592 if (pdata < 0) { 2593 perror_reply(425, "Can't open passive connection"); 2594 return; 2595 } 2596 2597 (void) seteuid((uid_t)0); 2598 2599 pasv_addr = ctrl_addr; 2600 pasv_addr.su_port = 0; 2601 len = pasv_addr.su_len; 2602 2603 #ifdef IP_PORTRANGE 2604 if (ctrl_addr.su_family == AF_INET) { 2605 int on = restricted_data_ports ? IP_PORTRANGE_HIGH 2606 : IP_PORTRANGE_DEFAULT; 2607 2608 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2609 (char *)&on, sizeof(on)) < 0) 2610 goto pasv_error; 2611 } 2612 #endif 2613 #ifdef IPV6_PORTRANGE 2614 if (ctrl_addr.su_family == AF_INET6) { 2615 int on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2616 : IPV6_PORTRANGE_DEFAULT; 2617 2618 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2619 (char *)&on, sizeof(on)) < 0) 2620 goto pasv_error; 2621 } 2622 #endif 2623 2624 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0) 2625 goto pasv_error; 2626 2627 (void) seteuid((uid_t)pw->pw_uid); 2628 2629 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2630 goto pasv_error; 2631 if (listen(pdata, 1) < 0) 2632 goto pasv_error; 2633 2634 #define UC(b) (((int) b) & 0xff) 2635 2636 if (strcmp(cmd, "LPSV") == 0) { 2637 p = (char *)&pasv_addr.su_port; 2638 switch (pasv_addr.su_family) { 2639 case AF_INET: 2640 a = (char *) &pasv_addr.su_sin.sin_addr; 2641 v4_reply: 2642 reply(228, 2643 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2644 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2645 2, UC(p[0]), UC(p[1])); 2646 return; 2647 case AF_INET6: 2648 if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) { 2649 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2650 goto v4_reply; 2651 } 2652 a = (char *) &pasv_addr.su_sin6.sin6_addr; 2653 reply(228, 2654 "Entering Long Passive Mode " 2655 "(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2656 6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2657 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 2658 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 2659 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 2660 2, UC(p[0]), UC(p[1])); 2661 return; 2662 } 2663 } else if (strcmp(cmd, "EPSV") == 0) { 2664 switch (pasv_addr.su_family) { 2665 case AF_INET: 2666 case AF_INET6: 2667 reply(229, "Entering Extended Passive Mode (|||%d|)", 2668 ntohs(pasv_addr.su_port)); 2669 return; 2670 } 2671 } else { 2672 /* more proper error code? */ 2673 } 2674 2675 pasv_error: 2676 (void) seteuid((uid_t)pw->pw_uid); 2677 (void) close(pdata); 2678 pdata = -1; 2679 perror_reply(425, "Can't open passive connection"); 2680 return; 2681 } 2682 2683 /* 2684 * Generate unique name for file with basename "local". 2685 * The file named "local" is already known to exist. 2686 * Generates failure reply on error. 2687 */ 2688 static char * 2689 gunique(local) 2690 char *local; 2691 { 2692 static char new[MAXPATHLEN]; 2693 struct stat st; 2694 int count; 2695 char *cp; 2696 2697 cp = strrchr(local, '/'); 2698 if (cp) 2699 *cp = '\0'; 2700 if (stat(cp ? local : ".", &st) < 0) { 2701 perror_reply(553, cp ? local : "."); 2702 return ((char *) 0); 2703 } 2704 if (cp) 2705 *cp = '/'; 2706 /* -4 is for the .nn<null> we put on the end below */ 2707 (void) snprintf(new, sizeof(new) - 4, "%s", local); 2708 cp = new + strlen(new); 2709 *cp++ = '.'; 2710 for (count = 1; count < 100; count++) { 2711 (void)sprintf(cp, "%d", count); 2712 if (stat(new, &st) < 0) 2713 return (new); 2714 } 2715 reply(452, "Unique file name cannot be created."); 2716 return (NULL); 2717 } 2718 2719 /* 2720 * Format and send reply containing system error number. 2721 */ 2722 void 2723 perror_reply(code, string) 2724 int code; 2725 char *string; 2726 { 2727 2728 reply(code, "%s: %s.", string, strerror(errno)); 2729 } 2730 2731 static char *onefile[] = { 2732 "", 2733 0 2734 }; 2735 2736 void 2737 send_file_list(whichf) 2738 char *whichf; 2739 { 2740 struct stat st; 2741 DIR *dirp = NULL; 2742 struct dirent *dir; 2743 FILE *dout = NULL; 2744 char **dirlist, *dirname; 2745 int simple = 0; 2746 int freeglob = 0; 2747 glob_t gl; 2748 2749 if (strpbrk(whichf, "~{[*?") != NULL) { 2750 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE; 2751 2752 memset(&gl, 0, sizeof(gl)); 2753 gl.gl_matchc = MAXGLOBARGS; 2754 flags |= GLOB_LIMIT; 2755 freeglob = 1; 2756 if (glob(whichf, flags, 0, &gl)) { 2757 reply(550, "not found"); 2758 goto out; 2759 } else if (gl.gl_pathc == 0) { 2760 errno = ENOENT; 2761 perror_reply(550, whichf); 2762 goto out; 2763 } 2764 dirlist = gl.gl_pathv; 2765 } else { 2766 onefile[0] = whichf; 2767 dirlist = onefile; 2768 simple = 1; 2769 } 2770 2771 while ((dirname = *dirlist++)) { 2772 if (stat(dirname, &st) < 0) { 2773 /* 2774 * If user typed "ls -l", etc, and the client 2775 * used NLST, do what the user meant. 2776 */ 2777 if (dirname[0] == '-' && *dirlist == NULL && 2778 transflag == 0) { 2779 retrieve(_PATH_LS " %s", dirname); 2780 goto out; 2781 } 2782 perror_reply(550, whichf); 2783 if (dout != NULL) { 2784 (void) fclose(dout); 2785 transflag = 0; 2786 data = -1; 2787 pdata = -1; 2788 } 2789 goto out; 2790 } 2791 2792 if (S_ISREG(st.st_mode)) { 2793 if (dout == NULL) { 2794 dout = dataconn("file list", (off_t)-1, "w"); 2795 if (dout == NULL) 2796 goto out; 2797 transflag++; 2798 } 2799 fprintf(dout, "%s%s\n", dirname, 2800 type == TYPE_A ? "\r" : ""); 2801 byte_count += strlen(dirname) + 1; 2802 continue; 2803 } else if (!S_ISDIR(st.st_mode)) 2804 continue; 2805 2806 if ((dirp = opendir(dirname)) == NULL) 2807 continue; 2808 2809 while ((dir = readdir(dirp)) != NULL) { 2810 char nbuf[MAXPATHLEN]; 2811 2812 if (recvurg) { 2813 myoob(); 2814 recvurg = 0; 2815 transflag = 0; 2816 goto out; 2817 } 2818 2819 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 2820 continue; 2821 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 2822 dir->d_namlen == 2) 2823 continue; 2824 2825 snprintf(nbuf, sizeof(nbuf), 2826 "%s/%s", dirname, dir->d_name); 2827 2828 /* 2829 * We have to do a stat to insure it's 2830 * not a directory or special file. 2831 */ 2832 if (simple || (stat(nbuf, &st) == 0 && 2833 S_ISREG(st.st_mode))) { 2834 if (dout == NULL) { 2835 dout = dataconn("file list", (off_t)-1, 2836 "w"); 2837 if (dout == NULL) 2838 goto out; 2839 transflag++; 2840 } 2841 if (nbuf[0] == '.' && nbuf[1] == '/') 2842 fprintf(dout, "%s%s\n", &nbuf[2], 2843 type == TYPE_A ? "\r" : ""); 2844 else 2845 fprintf(dout, "%s%s\n", nbuf, 2846 type == TYPE_A ? "\r" : ""); 2847 byte_count += strlen(nbuf) + 1; 2848 } 2849 } 2850 (void) closedir(dirp); 2851 } 2852 2853 if (dout == NULL) 2854 reply(550, "No files found."); 2855 else if (ferror(dout) != 0) 2856 perror_reply(550, "Data connection"); 2857 else 2858 reply(226, "Transfer complete."); 2859 2860 transflag = 0; 2861 if (dout != NULL) 2862 (void) fclose(dout); 2863 data = -1; 2864 pdata = -1; 2865 out: 2866 if (freeglob) { 2867 freeglob = 0; 2868 globfree(&gl); 2869 } 2870 } 2871 2872 void 2873 reapchild(signo) 2874 int signo; 2875 { 2876 while (wait3(NULL, WNOHANG, NULL) > 0); 2877 } 2878 2879 #ifdef OLD_SETPROCTITLE 2880 /* 2881 * Clobber argv so ps will show what we're doing. (Stolen from sendmail.) 2882 * Warning, since this is usually started from inetd.conf, it often doesn't 2883 * have much of an environment or arglist to overwrite. 2884 */ 2885 void 2886 #if __STDC__ 2887 setproctitle(const char *fmt, ...) 2888 #else 2889 setproctitle(fmt, va_alist) 2890 char *fmt; 2891 va_dcl 2892 #endif 2893 { 2894 int i; 2895 va_list ap; 2896 char *p, *bp, ch; 2897 char buf[LINE_MAX]; 2898 2899 #if __STDC__ 2900 va_start(ap, fmt); 2901 #else 2902 va_start(ap); 2903 #endif 2904 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 2905 2906 /* make ps print our process name */ 2907 p = Argv[0]; 2908 *p++ = '-'; 2909 2910 i = strlen(buf); 2911 if (i > LastArgv - p - 2) { 2912 i = LastArgv - p - 2; 2913 buf[i] = '\0'; 2914 } 2915 bp = buf; 2916 while (ch = *bp++) 2917 if (ch != '\n' && ch != '\r') 2918 *p++ = ch; 2919 while (p < LastArgv) 2920 *p++ = ' '; 2921 } 2922 #endif /* OLD_SETPROCTITLE */ 2923 2924 static void 2925 logxfer(name, size, start) 2926 char *name; 2927 off_t size; 2928 time_t start; 2929 { 2930 char buf[1024]; 2931 char path[MAXPATHLEN + 1]; 2932 time_t now; 2933 2934 if (statfd >= 0 && getwd(path) != NULL) { 2935 time(&now); 2936 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s/%s!%qd!%ld\n", 2937 ctime(&now)+4, ident, remotehost, 2938 path, name, (long long)size, 2939 (long)(now - start + (now == start))); 2940 write(statfd, buf, strlen(buf)); 2941 } 2942 } 2943