1 /* 2 * Copyright (c) 1985, 1988, 1990, 1992 Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #ifndef lint 9 char copyright[] = 10 "@(#) Copyright (c) 1985, 1988, 1990, 1992 Regents of the University of California.\n\ 11 All rights reserved.\n"; 12 #endif /* not lint */ 13 14 #ifndef lint 15 static char sccsid[] = "@(#)ftpd.c 5.42 (Berkeley) 07/15/92"; 16 #endif /* not lint */ 17 18 /* 19 * FTP server. 20 */ 21 #include <sys/param.h> 22 #include <sys/stat.h> 23 #include <sys/ioctl.h> 24 #include <sys/socket.h> 25 #include <sys/wait.h> 26 27 #include <netinet/in.h> 28 #include <netinet/in_systm.h> 29 #include <netinet/ip.h> 30 31 #define FTP_NAMES 32 #include <arpa/ftp.h> 33 #include <arpa/inet.h> 34 #include <arpa/telnet.h> 35 36 #include <signal.h> 37 #include <dirent.h> 38 #include <fcntl.h> 39 #include <time.h> 40 #include <pwd.h> 41 #include <setjmp.h> 42 #include <netdb.h> 43 #include <errno.h> 44 #include <syslog.h> 45 #include <unistd.h> 46 #include <stdio.h> 47 #include <ctype.h> 48 #include <stdlib.h> 49 #include <string.h> 50 #include "pathnames.h" 51 #include "extern.h" 52 53 #if __STDC__ 54 #include <stdarg.h> 55 #else 56 #include <varargs.h> 57 #endif 58 59 extern off_t restart_point; 60 extern char *home; /* pointer to home directory for glob */ 61 extern char cbuf[]; 62 extern char version[]; 63 64 struct sockaddr_in ctrl_addr; 65 struct sockaddr_in data_source; 66 struct sockaddr_in data_dest; 67 struct sockaddr_in his_addr; 68 struct sockaddr_in pasv_addr; 69 70 int data; 71 jmp_buf errcatch, urgcatch; 72 int logged_in; 73 struct passwd *pw; 74 int debug; 75 int timeout = 900; /* timeout after 15 minutes of inactivity */ 76 int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 77 int logging; 78 int guest; 79 int type; 80 int form; 81 int stru; /* avoid C keyword */ 82 int mode; 83 int usedefault = 1; /* for data transfers */ 84 int pdata = -1; /* for passive mode */ 85 int transflag; 86 off_t file_size; 87 off_t byte_count; 88 #if !defined(CMASK) || CMASK == 0 89 #undef CMASK 90 #define CMASK 027 91 #endif 92 int defumask = CMASK; /* default umask value */ 93 char tmpline[7]; 94 char hostname[MAXHOSTNAMELEN]; 95 char remotehost[MAXHOSTNAMELEN]; 96 97 /* 98 * Timeout intervals for retrying connections 99 * to hosts that don't accept PORT cmds. This 100 * is a kludge, but given the problems with TCP... 101 */ 102 #define SWAITMAX 90 /* wait at most 90 seconds */ 103 #define SWAITINT 5 /* interval between retries */ 104 105 int swaitmax = SWAITMAX; 106 int swaitint = SWAITINT; 107 108 #ifdef SETPROCTITLE 109 char **Argv = NULL; /* pointer to argument vector */ 110 char *LastArgv = NULL; /* end of argv */ 111 char proctitle[BUFSIZ]; /* initial part of title */ 112 #endif /* SETPROCTITLE */ 113 114 #define MAXLINE 256 115 116 #define LOGCMD(cmd, file) \ 117 if (logging > 1) \ 118 syslog(LOG_INFO,"%s %s%s", cmd, \ 119 *(file) == '/' ? "" : curdir(), file); 120 #define LOGCMD2(cmd, file1, file2) \ 121 if (logging > 1) \ 122 syslog(LOG_INFO,"%s %s%s %s%s", cmd, \ 123 *(file1) == '/' ? "" : curdir(), file1, \ 124 *(file2) == '/' ? "" : curdir(), file2); 125 #define LOGBYTES(cmd, file, cnt) \ 126 if (logging > 1) { \ 127 if (cnt == (off_t)-1) \ 128 syslog(LOG_INFO,"%s %s%s", cmd, \ 129 *(file) == '/' ? "" : curdir(), file); \ 130 else \ 131 syslog(LOG_INFO, "%s %s%s = %qd bytes", \ 132 cmd, (*(file) == '/') ? "" : curdir(), file, cnt); \ 133 } 134 135 static void ack __P((char *)); 136 static void myoob __P((int)); 137 static int checkuser __P((char *)); 138 static FILE *dataconn __P((char *, off_t, char *)); 139 static void dolog __P((struct sockaddr_in *)); 140 static char *curdir __P((void)); 141 static void end_login __P((void)); 142 static FILE *getdatasock __P((char *)); 143 static char *gunique __P((char *)); 144 static void lostconn __P((int)); 145 static void pass __P((char *)); 146 static int receive_data __P((FILE *, FILE *)); 147 static void send_data __P((FILE *, FILE *, off_t)); 148 static struct passwd * 149 sgetpwnam __P((char *)); 150 static char *sgetsave __P((char *)); 151 static void user __P((char *)); 152 153 static char * 154 curdir() 155 { 156 static char path[MAXPATHLEN+1+1]; /* path + '/' + '\0' */ 157 158 if (getcwd(path, sizeof(path)-2) == NULL) 159 return (""); 160 if (path[1] != '\0') /* special case for root dir. */ 161 strcat(path, "/"); 162 /* For guest account, skip / since it's chrooted */ 163 return (guest ? path+1 : path); 164 } 165 166 int 167 main(argc, argv, envp) 168 int argc; 169 char *argv[]; 170 char **envp; 171 { 172 int addrlen, on = 1, tos; 173 char *cp, line[MAXLINE]; 174 FILE *fd; 175 176 /* 177 * LOG_NDELAY sets up the logging connection immediately, 178 * necessary for anonymous ftp's that chroot and can't do it later. 179 */ 180 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 181 addrlen = sizeof (his_addr); 182 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 183 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 184 exit(1); 185 } 186 addrlen = sizeof (ctrl_addr); 187 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 188 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 189 exit(1); 190 } 191 #ifdef IP_TOS 192 tos = IPTOS_LOWDELAY; 193 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, sizeof(int)) < 0) 194 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 195 #endif 196 data_source.sin_port = htons(ntohs(ctrl_addr.sin_port) - 1); 197 debug = 0; 198 #ifdef SETPROCTITLE 199 /* 200 * Save start and extent of argv for setproctitle. 201 */ 202 Argv = argv; 203 while (*envp) 204 envp++; 205 LastArgv = envp[-1] + strlen(envp[-1]); 206 #endif /* SETPROCTITLE */ 207 208 argc--, argv++; 209 while (argc > 0 && *argv[0] == '-') { 210 for (cp = &argv[0][1]; *cp; cp++) switch (*cp) { 211 212 case 'v': 213 debug = 1; 214 break; 215 216 case 'd': 217 debug = 1; 218 break; 219 220 case 'l': 221 logging++; /* > 1 == extra logging */ 222 break; 223 224 case 't': 225 timeout = atoi(++cp); 226 if (maxtimeout < timeout) 227 maxtimeout = timeout; 228 goto nextopt; 229 230 case 'T': 231 maxtimeout = atoi(++cp); 232 if (timeout > maxtimeout) 233 timeout = maxtimeout; 234 goto nextopt; 235 236 case 'u': 237 { 238 int val = 0; 239 240 while (*++cp && *cp >= '0' && *cp <= '9') 241 val = val*8 + *cp - '0'; 242 if (*cp) 243 fprintf(stderr, "ftpd: Bad value for -u\n"); 244 else 245 defumask = val; 246 goto nextopt; 247 } 248 249 default: 250 fprintf(stderr, "ftpd: Unknown flag -%c ignored.\n", 251 *cp); 252 break; 253 } 254 nextopt: 255 argc--, argv++; 256 } 257 (void) freopen(_PATH_DEVNULL, "w", stderr); 258 (void) signal(SIGPIPE, lostconn); 259 (void) signal(SIGCHLD, SIG_IGN); 260 if ((int)signal(SIGURG, myoob) < 0) 261 syslog(LOG_ERR, "signal: %m"); 262 263 /* Try to handle urgent data inline */ 264 #ifdef SO_OOBINLINE 265 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 266 syslog(LOG_ERR, "setsockopt: %m"); 267 #endif 268 269 #ifdef F_SETOWN 270 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 271 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 272 #endif 273 dolog(&his_addr); 274 /* 275 * Set up default state 276 */ 277 data = -1; 278 type = TYPE_A; 279 form = FORM_N; 280 stru = STRU_F; 281 mode = MODE_S; 282 tmpline[0] = '\0'; 283 284 /* If logins are disabled, print out the message. */ 285 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 286 while (fgets(line, sizeof (line), fd) != NULL) { 287 if ((cp = index(line, '\n')) != NULL) 288 *cp = '\0'; 289 lreply(530, "%s", line); 290 } 291 (void) fflush(stdout); 292 (void) fclose(fd); 293 reply(530, "System not available."); 294 exit(0); 295 } 296 if ((fd = fopen(_PATH_FTPWELCOME, "r")) != NULL) { 297 while (fgets(line, sizeof (line), fd) != NULL) { 298 if ((cp = index(line, '\n')) != NULL) 299 *cp = '\0'; 300 lreply(220, "%s", line); 301 } 302 (void) fflush(stdout); 303 (void) fclose(fd); 304 /* reply(220,) must follow */ 305 } 306 (void) gethostname(hostname, sizeof (hostname)); 307 reply(220, "%s FTP server (%s) ready.", hostname, version); 308 (void) setjmp(errcatch); 309 for (;;) 310 (void) yyparse(); 311 /* NOTREACHED */ 312 } 313 314 static void 315 lostconn(signo) 316 int signo; 317 { 318 if (debug) 319 syslog(LOG_DEBUG, "lost connection"); 320 dologout(-1); 321 } 322 323 static char ttyline[20]; 324 325 /* 326 * Helper function for sgetpwnam(). 327 */ 328 static char * 329 sgetsave(s) 330 char *s; 331 { 332 char *new = malloc((unsigned) strlen(s) + 1); 333 334 if (new == NULL) { 335 perror_reply(421, "Local resource failure: malloc"); 336 dologout(1); 337 /* NOTREACHED */ 338 } 339 (void) strcpy(new, s); 340 return (new); 341 } 342 343 /* 344 * Save the result of a getpwnam. Used for USER command, since 345 * the data returned must not be clobbered by any other command 346 * (e.g., globbing). 347 */ 348 static struct passwd * 349 sgetpwnam(name) 350 char *name; 351 { 352 static struct passwd save; 353 register struct passwd *p; 354 char *sgetsave(); 355 356 if ((p = getpwnam(name)) == NULL) 357 return (p); 358 if (save.pw_name) { 359 free(save.pw_name); 360 free(save.pw_passwd); 361 free(save.pw_gecos); 362 free(save.pw_dir); 363 free(save.pw_shell); 364 } 365 save = *p; 366 save.pw_name = sgetsave(p->pw_name); 367 save.pw_passwd = sgetsave(p->pw_passwd); 368 save.pw_gecos = sgetsave(p->pw_gecos); 369 save.pw_dir = sgetsave(p->pw_dir); 370 save.pw_shell = sgetsave(p->pw_shell); 371 return (&save); 372 } 373 374 static int login_attempts; /* number of failed login attempts */ 375 static int askpasswd; /* had user command, ask for passwd */ 376 static char curname[10]; /* current USER name */ 377 378 /* 379 * USER command. 380 * Sets global passwd pointer pw if named account exists and is acceptable; 381 * sets askpasswd if a PASS command is expected. If logged in previously, 382 * need to reset state. If name is "ftp" or "anonymous", the name is not in 383 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 384 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 385 * requesting login privileges. Disallow anyone who does not have a standard 386 * shell as returned by getusershell(). Disallow anyone mentioned in the file 387 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 388 */ 389 void 390 user(name) 391 char *name; 392 { 393 register char *cp; 394 char *shell; 395 396 if (logged_in) { 397 if (guest) { 398 reply(530, "Can't change user from guest login."); 399 return; 400 } 401 end_login(); 402 } 403 404 guest = 0; 405 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 406 if (checkuser("ftp") || checkuser("anonymous")) 407 reply(530, "User %s access denied.", name); 408 else if ((pw = sgetpwnam("ftp")) != NULL) { 409 guest = 1; 410 askpasswd = 1; 411 reply(331, 412 "Guest login ok, type your name as password."); 413 } else 414 reply(530, "User %s unknown.", name); 415 if (!askpasswd && logging) 416 syslog(LOG_NOTICE, 417 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 418 return; 419 } 420 if (pw = sgetpwnam(name)) { 421 if ((shell = pw->pw_shell) == NULL || *shell == 0) 422 shell = _PATH_BSHELL; 423 while ((cp = getusershell()) != NULL) 424 if (strcmp(cp, shell) == 0) 425 break; 426 endusershell(); 427 428 if (cp == NULL || checkuser(name)) { 429 reply(530, "User %s access denied.", name); 430 if (logging) 431 syslog(LOG_NOTICE, 432 "FTP LOGIN REFUSED FROM %s, %s", 433 remotehost, name); 434 pw = (struct passwd *) NULL; 435 return; 436 } 437 } 438 if (logging) 439 strncpy(curname, name, sizeof(curname)-1); 440 reply(331, "Password required for %s.", name); 441 askpasswd = 1; 442 /* 443 * Delay before reading passwd after first failed 444 * attempt to slow down passwd-guessing programs. 445 */ 446 if (login_attempts) 447 sleep((unsigned) login_attempts); 448 } 449 450 /* 451 * Check if a user is in the file _PATH_FTPUSERS 452 */ 453 static int 454 checkuser(name) 455 char *name; 456 { 457 register FILE *fd; 458 register char *p; 459 char line[BUFSIZ]; 460 int found = 0; 461 462 if ((fd = fopen(_PATH_FTPUSERS, "r")) != NULL) { 463 while (fgets(line, sizeof(line), fd) != NULL) 464 if ((p = index(line, '\n')) != NULL) { 465 *p = '\0'; 466 if (line[0] == '#') 467 continue; 468 if (strcmp(p, name) == 0) { 469 found = 1; 470 break; 471 } 472 } 473 (void) fclose(fd); 474 } 475 return (found); 476 } 477 478 /* 479 * Terminate login as previous user, if any, resetting state; 480 * used when USER command is given or login fails. 481 */ 482 static void 483 end_login() 484 { 485 486 (void) seteuid((uid_t)0); 487 if (logged_in) 488 logwtmp(ttyline, "", ""); 489 pw = NULL; 490 logged_in = 0; 491 guest = 0; 492 } 493 494 void 495 pass(passwd) 496 char *passwd; 497 { 498 char *xpasswd, *salt; 499 FILE *fd; 500 501 if (logged_in || askpasswd == 0) { 502 reply(503, "Login with USER first."); 503 return; 504 } 505 askpasswd = 0; 506 if (!guest) { /* "ftp" is only account allowed no password */ 507 if (pw == NULL) 508 salt = "xx"; 509 else 510 salt = pw->pw_passwd; 511 xpasswd = crypt(passwd, salt); 512 /* The strcmp does not catch null passwords! */ 513 if (pw == NULL || *pw->pw_passwd == '\0' || 514 strcmp(xpasswd, pw->pw_passwd)) { 515 reply(530, "Login incorrect."); 516 if (logging) 517 syslog(LOG_NOTICE, 518 "FTP LOGIN FAILED FROM %s, %s", 519 remotehost, curname); 520 pw = NULL; 521 if (login_attempts++ >= 5) { 522 syslog(LOG_NOTICE, 523 "repeated login failures from %s", 524 remotehost); 525 exit(0); 526 } 527 return; 528 } 529 } 530 login_attempts = 0; /* this time successful */ 531 if (setegid((gid_t)pw->pw_gid) < 0) { 532 reply(550, "Can't set gid."); 533 return; 534 } 535 (void) initgroups(pw->pw_name, pw->pw_gid); 536 537 /* open wtmp before chroot */ 538 (void)sprintf(ttyline, "ftp%d", getpid()); 539 logwtmp(ttyline, pw->pw_name, remotehost); 540 logged_in = 1; 541 542 if (guest) { 543 /* 544 * We MUST do a chdir() after the chroot. Otherwise 545 * the old current directory will be accessible as "." 546 * outside the new root! 547 */ 548 if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) { 549 reply(550, "Can't set guest privileges."); 550 goto bad; 551 } 552 } else if (chdir(pw->pw_dir) < 0) { 553 if (chdir("/") < 0) { 554 reply(530, "User %s: can't change directory to %s.", 555 pw->pw_name, pw->pw_dir); 556 goto bad; 557 } else 558 lreply(230, "No directory! Logging in with home=/"); 559 } 560 if (seteuid((uid_t)pw->pw_uid) < 0) { 561 reply(550, "Can't set uid."); 562 goto bad; 563 } 564 /* 565 * Display a login message, if it exists. 566 * N.B. reply(230,) must follow the message. 567 */ 568 if ((fd = fopen(_PATH_FTPLOGINMESG, "r")) != NULL) { 569 char *cp, line[MAXLINE]; 570 571 while (fgets(line, sizeof (line), fd) != NULL) { 572 if ((cp = index(line, '\n')) != NULL) 573 *cp = '\0'; 574 lreply(230, "%s", line); 575 } 576 (void) fflush(stdout); 577 (void) fclose(fd); 578 } 579 if (guest) { 580 reply(230, "Guest login ok, access restrictions apply."); 581 #ifdef SETPROCTITLE 582 sprintf(proctitle, "%s: anonymous/%.*s", remotehost, 583 sizeof(proctitle) - sizeof(remotehost) - 584 sizeof(": anonymous/"), passwd); 585 setproctitle(proctitle); 586 #endif /* SETPROCTITLE */ 587 if (logging) 588 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 589 remotehost, passwd); 590 home = "/"; /* guest home dir for globbing */ 591 } else { 592 reply(230, "User %s logged in.", pw->pw_name); 593 #ifdef SETPROCTITLE 594 sprintf(proctitle, "%s: %s", remotehost, pw->pw_name); 595 setproctitle(proctitle); 596 #endif /* SETPROCTITLE */ 597 if (logging) 598 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 599 remotehost, pw->pw_name); 600 home = pw->pw_dir; /* home dir for globbing */ 601 } 602 (void) umask(defumask); 603 return; 604 bad: 605 /* Forget all about it... */ 606 end_login(); 607 } 608 609 void 610 retrieve(cmd, name) 611 char *cmd, *name; 612 { 613 FILE *fin, *dout; 614 struct stat st; 615 int (*closefunc)(); 616 617 if (cmd == 0) { 618 fin = fopen(name, "r"), closefunc = fclose; 619 st.st_size = 0; 620 } else { 621 char line[BUFSIZ]; 622 623 (void) sprintf(line, cmd, name), name = line; 624 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 625 st.st_size = -1; 626 st.st_blksize = BUFSIZ; 627 } 628 if (fin == NULL) { 629 if (errno != 0) { 630 perror_reply(550, name); 631 if (cmd == 0) { 632 LOGCMD("get", name); 633 } 634 } 635 return; 636 } 637 byte_count = -1; 638 if (cmd == 0 && 639 (fstat(fileno(fin), &st) < 0 || (st.st_mode&S_IFMT) != S_IFREG)) { 640 reply(550, "%s: not a plain file.", name); 641 goto done; 642 } 643 if (restart_point) { 644 if (type == TYPE_A) { 645 register int i, n, c; 646 647 n = restart_point; 648 i = 0; 649 while (i++ < n) { 650 if ((c=getc(fin)) == EOF) { 651 perror_reply(550, name); 652 goto done; 653 } 654 if (c == '\n') 655 i++; 656 } 657 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 658 perror_reply(550, name); 659 goto done; 660 } 661 } 662 dout = dataconn(name, st.st_size, "w"); 663 if (dout == NULL) 664 goto done; 665 send_data(fin, dout, st.st_blksize); 666 (void) fclose(dout); 667 data = -1; 668 pdata = -1; 669 done: 670 if (cmd == 0) 671 LOGBYTES("get", name, byte_count); 672 (*closefunc)(fin); 673 } 674 675 void 676 store(name, mode, unique) 677 char *name, *mode; 678 int unique; 679 { 680 FILE *fout, *din; 681 struct stat st; 682 int (*closefunc)(); 683 684 if (unique && stat(name, &st) == 0 && 685 (name = gunique(name)) == NULL) { 686 LOGCMD(*mode == 'w' ? "put" : "append", name); 687 return; 688 } 689 690 if (restart_point) 691 mode = "r+w"; 692 fout = fopen(name, mode); 693 closefunc = fclose; 694 if (fout == NULL) { 695 perror_reply(553, name); 696 LOGCMD(*mode == 'w' ? "put" : "append", name); 697 return; 698 } 699 byte_count = -1; 700 if (restart_point) { 701 if (type == TYPE_A) { 702 register int i, n, c; 703 704 n = restart_point; 705 i = 0; 706 while (i++ < n) { 707 if ((c=getc(fout)) == EOF) { 708 perror_reply(550, name); 709 goto done; 710 } 711 if (c == '\n') 712 i++; 713 } 714 /* 715 * We must do this seek to "current" position 716 * because we are changing from reading to 717 * writing. 718 */ 719 if (fseek(fout, 0L, L_INCR) < 0) { 720 perror_reply(550, name); 721 goto done; 722 } 723 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 724 perror_reply(550, name); 725 goto done; 726 } 727 } 728 din = dataconn(name, (off_t)-1, "r"); 729 if (din == NULL) 730 goto done; 731 if (receive_data(din, fout) == 0) { 732 if (unique) 733 reply(226, "Transfer complete (unique file name:%s).", 734 name); 735 else 736 reply(226, "Transfer complete."); 737 } 738 (void) fclose(din); 739 data = -1; 740 pdata = -1; 741 done: 742 LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count); 743 (*closefunc)(fout); 744 } 745 746 static FILE * 747 getdatasock(mode) 748 char *mode; 749 { 750 int s, on = 1, tries; 751 int t; 752 753 if (data >= 0) 754 return (fdopen(data, mode)); 755 (void) seteuid((uid_t)0); 756 s = socket(AF_INET, SOCK_STREAM, 0); 757 if (s < 0) 758 goto bad; 759 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 760 (char *) &on, sizeof (on)) < 0) 761 goto bad; 762 /* anchor socket to avoid multi-homing problems */ 763 data_source.sin_family = AF_INET; 764 data_source.sin_addr = ctrl_addr.sin_addr; 765 for (tries = 1; ; tries++) { 766 if (bind(s, (struct sockaddr *)&data_source, 767 sizeof (data_source)) >= 0) 768 break; 769 if (errno != EADDRINUSE || tries > 10) 770 goto bad; 771 sleep(tries); 772 } 773 (void) seteuid((uid_t)pw->pw_uid); 774 #ifdef IP_TOS 775 on = IPTOS_THROUGHPUT; 776 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0) 777 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 778 #endif 779 return (fdopen(s, mode)); 780 bad: 781 /* Return the real value of errno (close may change it) */ 782 t = errno; 783 (void) seteuid((uid_t)pw->pw_uid); 784 (void) close(s); 785 errno = t; 786 return (NULL); 787 } 788 789 static FILE * 790 dataconn(name, size, mode) 791 char *name; 792 off_t size; 793 char *mode; 794 { 795 char sizebuf[32]; 796 FILE *file; 797 int retry = 0, tos; 798 799 file_size = size; 800 byte_count = 0; 801 if (size != (off_t) -1) 802 (void) sprintf (sizebuf, " (%qd bytes)", size); 803 else 804 (void) strcpy(sizebuf, ""); 805 if (pdata >= 0) { 806 struct sockaddr_in from; 807 int s, fromlen = sizeof(from); 808 809 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 810 if (s < 0) { 811 reply(425, "Can't open data connection."); 812 (void) close(pdata); 813 pdata = -1; 814 return(NULL); 815 } 816 (void) close(pdata); 817 pdata = s; 818 #ifdef IP_TOS 819 tos = IPTOS_LOWDELAY; 820 (void) setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&tos, 821 sizeof(int)); 822 #endif 823 reply(150, "Opening %s mode data connection for '%s'%s.", 824 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 825 return(fdopen(pdata, mode)); 826 } 827 if (data >= 0) { 828 reply(125, "Using existing data connection for '%s'%s.", 829 name, sizebuf); 830 usedefault = 1; 831 return (fdopen(data, mode)); 832 } 833 if (usedefault) 834 data_dest = his_addr; 835 usedefault = 1; 836 file = getdatasock(mode); 837 if (file == NULL) { 838 reply(425, "Can't create data socket (%s,%d): %s.", 839 inet_ntoa(data_source.sin_addr), 840 ntohs(data_source.sin_port), strerror(errno)); 841 return (NULL); 842 } 843 data = fileno(file); 844 while (connect(data, (struct sockaddr *)&data_dest, 845 sizeof (data_dest)) < 0) { 846 if (errno == EADDRINUSE && retry < swaitmax) { 847 sleep((unsigned) swaitint); 848 retry += swaitint; 849 continue; 850 } 851 perror_reply(425, "Can't build data connection"); 852 (void) fclose(file); 853 data = -1; 854 return (NULL); 855 } 856 reply(150, "Opening %s mode data connection for '%s'%s.", 857 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 858 return (file); 859 } 860 861 /* 862 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 863 * encapsulation of the data subject * to Mode, Structure, and Type. 864 * 865 * NB: Form isn't handled. 866 */ 867 static void 868 send_data(instr, outstr, blksize) 869 FILE *instr, *outstr; 870 off_t blksize; 871 { 872 register int c, cnt; 873 register char *buf; 874 int netfd, filefd; 875 876 transflag++; 877 if (setjmp(urgcatch)) { 878 transflag = 0; 879 return; 880 } 881 switch (type) { 882 883 case TYPE_A: 884 while ((c = getc(instr)) != EOF) { 885 byte_count++; 886 if (c == '\n') { 887 if (ferror(outstr)) 888 goto data_err; 889 (void) putc('\r', outstr); 890 } 891 (void) putc(c, outstr); 892 } 893 fflush(outstr); 894 transflag = 0; 895 if (ferror(instr)) 896 goto file_err; 897 if (ferror(outstr)) 898 goto data_err; 899 reply(226, "Transfer complete."); 900 return; 901 902 case TYPE_I: 903 case TYPE_L: 904 if ((buf = malloc((u_int)blksize)) == NULL) { 905 transflag = 0; 906 perror_reply(451, "Local resource failure: malloc"); 907 return; 908 } 909 netfd = fileno(outstr); 910 filefd = fileno(instr); 911 while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 && 912 write(netfd, buf, cnt) == cnt) 913 byte_count += cnt; 914 transflag = 0; 915 (void)free(buf); 916 if (cnt != 0) { 917 if (cnt < 0) 918 goto file_err; 919 goto data_err; 920 } 921 reply(226, "Transfer complete."); 922 return; 923 default: 924 transflag = 0; 925 reply(550, "Unimplemented TYPE %d in send_data", type); 926 return; 927 } 928 929 data_err: 930 transflag = 0; 931 perror_reply(426, "Data connection"); 932 return; 933 934 file_err: 935 transflag = 0; 936 perror_reply(551, "Error on input file"); 937 } 938 939 /* 940 * Transfer data from peer to "outstr" using the appropriate encapulation of 941 * the data subject to Mode, Structure, and Type. 942 * 943 * N.B.: Form isn't handled. 944 */ 945 static int 946 receive_data(instr, outstr) 947 FILE *instr, *outstr; 948 { 949 register int c; 950 int cnt, bare_lfs = 0; 951 char buf[BUFSIZ]; 952 953 transflag++; 954 if (setjmp(urgcatch)) { 955 transflag = 0; 956 return (-1); 957 } 958 switch (type) { 959 960 case TYPE_I: 961 case TYPE_L: 962 while ((cnt = read(fileno(instr), buf, sizeof buf)) > 0) { 963 if (write(fileno(outstr), buf, cnt) != cnt) 964 goto file_err; 965 byte_count += cnt; 966 } 967 if (cnt < 0) 968 goto data_err; 969 transflag = 0; 970 return (0); 971 972 case TYPE_E: 973 reply(553, "TYPE E not implemented."); 974 transflag = 0; 975 return (-1); 976 977 case TYPE_A: 978 while ((c = getc(instr)) != EOF) { 979 byte_count++; 980 if (c == '\n') 981 bare_lfs++; 982 while (c == '\r') { 983 if (ferror(outstr)) 984 goto data_err; 985 if ((c = getc(instr)) != '\n') { 986 (void) putc ('\r', outstr); 987 if (c == '\0' || c == EOF) 988 goto contin2; 989 } 990 } 991 (void) putc(c, outstr); 992 contin2: ; 993 } 994 fflush(outstr); 995 if (ferror(instr)) 996 goto data_err; 997 if (ferror(outstr)) 998 goto file_err; 999 transflag = 0; 1000 if (bare_lfs) { 1001 lreply(230, "WARNING! %d bare linefeeds received in ASCII mode", bare_lfs); 1002 printf(" File may not have transferred correctly.\r\n"); 1003 } 1004 return (0); 1005 default: 1006 reply(550, "Unimplemented TYPE %d in receive_data", type); 1007 transflag = 0; 1008 return (-1); 1009 } 1010 1011 data_err: 1012 transflag = 0; 1013 perror_reply(426, "Data Connection"); 1014 return (-1); 1015 1016 file_err: 1017 transflag = 0; 1018 perror_reply(452, "Error writing file"); 1019 return (-1); 1020 } 1021 1022 void 1023 statfilecmd(filename) 1024 char *filename; 1025 { 1026 char line[BUFSIZ]; 1027 FILE *fin; 1028 int c; 1029 1030 (void)snprintf(line, sizeof(line), "/bin/ls -lgA %s", filename); 1031 fin = ftpd_popen(line, "r"); 1032 lreply(211, "status of %s:", filename); 1033 while ((c = getc(fin)) != EOF) { 1034 if (c == '\n') { 1035 if (ferror(stdout)){ 1036 perror_reply(421, "control connection"); 1037 (void) ftpd_pclose(fin); 1038 dologout(1); 1039 /* NOTREACHED */ 1040 } 1041 if (ferror(fin)) { 1042 perror_reply(551, filename); 1043 (void) ftpd_pclose(fin); 1044 return; 1045 } 1046 (void) putc('\r', stdout); 1047 } 1048 (void) putc(c, stdout); 1049 } 1050 (void) ftpd_pclose(fin); 1051 reply(211, "End of Status"); 1052 } 1053 1054 void 1055 statcmd() 1056 { 1057 struct sockaddr_in *sin; 1058 u_char *a, *p; 1059 1060 lreply(211, "%s FTP server status:", hostname, version); 1061 printf(" %s\r\n", version); 1062 printf(" Connected to %s", remotehost); 1063 if (!isdigit(remotehost[0])) 1064 printf(" (%s)", inet_ntoa(his_addr.sin_addr)); 1065 printf("\r\n"); 1066 if (logged_in) { 1067 if (guest) 1068 printf(" Logged in anonymously\r\n"); 1069 else 1070 printf(" Logged in as %s\r\n", pw->pw_name); 1071 } else if (askpasswd) 1072 printf(" Waiting for password\r\n"); 1073 else 1074 printf(" Waiting for user name\r\n"); 1075 printf(" TYPE: %s", typenames[type]); 1076 if (type == TYPE_A || type == TYPE_E) 1077 printf(", FORM: %s", formnames[form]); 1078 if (type == TYPE_L) 1079 #if NBBY == 8 1080 printf(" %d", NBBY); 1081 #else 1082 printf(" %d", bytesize); /* need definition! */ 1083 #endif 1084 printf("; STRUcture: %s; transfer MODE: %s\r\n", 1085 strunames[stru], modenames[mode]); 1086 if (data != -1) 1087 printf(" Data connection open\r\n"); 1088 else if (pdata != -1) { 1089 printf(" in Passive mode"); 1090 sin = &pasv_addr; 1091 goto printaddr; 1092 } else if (usedefault == 0) { 1093 printf(" PORT"); 1094 sin = &data_dest; 1095 printaddr: 1096 a = (u_char *) &sin->sin_addr; 1097 p = (u_char *) &sin->sin_port; 1098 #define UC(b) (((int) b) & 0xff) 1099 printf(" (%d,%d,%d,%d,%d,%d)\r\n", UC(a[0]), 1100 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1101 #undef UC 1102 } else 1103 printf(" No data connection\r\n"); 1104 reply(211, "End of status"); 1105 } 1106 1107 void 1108 fatal(s) 1109 char *s; 1110 { 1111 reply(451, "Error in server: %s\n", s); 1112 reply(221, "Closing connection due to server error."); 1113 dologout(0); 1114 /* NOTREACHED */ 1115 } 1116 1117 void 1118 #if __STDC__ 1119 reply(int n, const char *fmt, ...) 1120 #else 1121 reply(n, fmt, va_alist) 1122 int n; 1123 char *fmt; 1124 va_dcl 1125 #endif 1126 { 1127 va_list ap; 1128 #if __STDC__ 1129 va_start(ap, fmt); 1130 #else 1131 va_start(ap); 1132 #endif 1133 (void)printf("%d ", n); 1134 (void)vprintf(fmt, ap); 1135 (void)printf("\r\n"); 1136 (void)fflush(stdout); 1137 if (debug) { 1138 syslog(LOG_DEBUG, "<--- %d ", n); 1139 vsyslog(LOG_DEBUG, fmt, ap); 1140 } 1141 } 1142 1143 void 1144 #if __STDC__ 1145 lreply(int n, const char *fmt, ...) 1146 #else 1147 lreply(n, fmt, va_alist) 1148 int n; 1149 char *fmt; 1150 va_dcl 1151 #endif 1152 { 1153 va_list ap; 1154 #if __STDC__ 1155 va_start(ap, fmt); 1156 #else 1157 va_start(ap); 1158 #endif 1159 (void)printf("%d- ", n); 1160 (void)vprintf(fmt, ap); 1161 (void)printf("\r\n"); 1162 (void)fflush(stdout); 1163 if (debug) { 1164 syslog(LOG_DEBUG, "<--- %d- ", n); 1165 vsyslog(LOG_DEBUG, fmt, ap); 1166 } 1167 } 1168 1169 static void 1170 ack(s) 1171 char *s; 1172 { 1173 reply(250, "%s command successful.", s); 1174 } 1175 1176 void 1177 nack(s) 1178 char *s; 1179 { 1180 reply(502, "%s command not implemented.", s); 1181 } 1182 1183 /* ARGSUSED */ 1184 char * 1185 yyerror(s) 1186 char *s; 1187 { 1188 char *cp; 1189 1190 if (cp = index(cbuf,'\n')) 1191 *cp = '\0'; 1192 reply(500, "'%s': command not understood.", cbuf); 1193 } 1194 1195 void 1196 delete(name) 1197 char *name; 1198 { 1199 struct stat st; 1200 1201 LOGCMD("delete", name); 1202 if (stat(name, &st) < 0) { 1203 perror_reply(550, name); 1204 return; 1205 } 1206 if ((st.st_mode&S_IFMT) == S_IFDIR) { 1207 if (rmdir(name) < 0) { 1208 perror_reply(550, name); 1209 return; 1210 } 1211 goto done; 1212 } 1213 if (unlink(name) < 0) { 1214 perror_reply(550, name); 1215 return; 1216 } 1217 done: 1218 ack("DELE"); 1219 } 1220 1221 void 1222 cwd(path) 1223 char *path; 1224 { 1225 if (chdir(path) < 0) 1226 perror_reply(550, path); 1227 else 1228 ack("CWD"); 1229 } 1230 1231 void 1232 makedir(name) 1233 char *name; 1234 { 1235 LOGCMD("mkdir", name); 1236 if (mkdir(name, 0777) < 0) 1237 perror_reply(550, name); 1238 else 1239 reply(257, "MKD command successful."); 1240 } 1241 1242 void 1243 removedir(name) 1244 char *name; 1245 { 1246 LOGCMD("rmdir", name); 1247 if (rmdir(name) < 0) 1248 perror_reply(550, name); 1249 else 1250 ack("RMD"); 1251 } 1252 1253 void 1254 pwd() 1255 { 1256 char path[MAXPATHLEN + 1]; 1257 1258 if (getwd(path) == (char *)NULL) 1259 reply(550, "%s.", path); 1260 else 1261 reply(257, "\"%s\" is current directory.", path); 1262 } 1263 1264 char * 1265 renamefrom(name) 1266 char *name; 1267 { 1268 struct stat st; 1269 1270 if (stat(name, &st) < 0) { 1271 perror_reply(550, name); 1272 return ((char *)0); 1273 } 1274 reply(350, "File exists, ready for destination name"); 1275 return (name); 1276 } 1277 1278 void 1279 renamecmd(from, to) 1280 char *from, *to; 1281 { 1282 LOGCMD2("rename", from, to); 1283 if (rename(from, to) < 0) 1284 perror_reply(550, "rename"); 1285 else 1286 ack("RNTO"); 1287 } 1288 1289 static void 1290 dolog(sin) 1291 struct sockaddr_in *sin; 1292 { 1293 struct hostent *hp = gethostbyaddr((char *)&sin->sin_addr, 1294 sizeof (struct in_addr), AF_INET); 1295 1296 if (hp) 1297 (void) strncpy(remotehost, hp->h_name, sizeof (remotehost)); 1298 else 1299 (void) strncpy(remotehost, inet_ntoa(sin->sin_addr), 1300 sizeof (remotehost)); 1301 #ifdef SETPROCTITLE 1302 sprintf(proctitle, "%s: connected", remotehost); 1303 setproctitle(proctitle); 1304 #endif /* SETPROCTITLE */ 1305 1306 if (logging) 1307 syslog(LOG_INFO, "connection from %s", remotehost); 1308 } 1309 1310 /* 1311 * Record logout in wtmp file 1312 * and exit with supplied status. 1313 */ 1314 void 1315 dologout(status) 1316 int status; 1317 { 1318 if (logged_in) { 1319 (void) seteuid((uid_t)0); 1320 logwtmp(ttyline, "", ""); 1321 } 1322 /* beware of flushing buffers after a SIGPIPE */ 1323 _exit(status); 1324 } 1325 1326 static void 1327 myoob(signo) 1328 int signo; 1329 { 1330 char *cp; 1331 1332 /* only process if transfer occurring */ 1333 if (!transflag) 1334 return; 1335 cp = tmpline; 1336 if (getline(cp, 7, stdin) == NULL) { 1337 reply(221, "You could at least say goodbye."); 1338 dologout(0); 1339 } 1340 upper(cp); 1341 if (strcmp(cp, "ABOR\r\n") == 0) { 1342 tmpline[0] = '\0'; 1343 reply(426, "Transfer aborted. Data connection closed."); 1344 reply(226, "Abort successful"); 1345 longjmp(urgcatch, 1); 1346 } 1347 if (strcmp(cp, "STAT\r\n") == 0) { 1348 if (file_size != (off_t) -1) 1349 reply(213, "Status: %qd of %qd bytes transferred", 1350 byte_count, file_size); 1351 else 1352 reply(213, "Status: %qd bytes transferred", byte_count); 1353 } 1354 } 1355 1356 /* 1357 * Note: a response of 425 is not mentioned as a possible response to 1358 * the PASV command in RFC959. However, it has been blessed as 1359 * a legitimate response by Jon Postel in a telephone conversation 1360 * with Rick Adams on 25 Jan 89. 1361 */ 1362 void 1363 passive() 1364 { 1365 int len; 1366 register char *p, *a; 1367 1368 pdata = socket(AF_INET, SOCK_STREAM, 0); 1369 if (pdata < 0) { 1370 perror_reply(425, "Can't open passive connection"); 1371 return; 1372 } 1373 pasv_addr = ctrl_addr; 1374 pasv_addr.sin_port = 0; 1375 (void) seteuid((uid_t)0); 1376 if (bind(pdata, (struct sockaddr *)&pasv_addr, sizeof(pasv_addr)) < 0) { 1377 (void) seteuid((uid_t)pw->pw_uid); 1378 goto pasv_error; 1379 } 1380 (void) seteuid((uid_t)pw->pw_uid); 1381 len = sizeof(pasv_addr); 1382 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 1383 goto pasv_error; 1384 if (listen(pdata, 1) < 0) 1385 goto pasv_error; 1386 a = (char *) &pasv_addr.sin_addr; 1387 p = (char *) &pasv_addr.sin_port; 1388 1389 #define UC(b) (((int) b) & 0xff) 1390 1391 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 1392 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1393 return; 1394 1395 pasv_error: 1396 (void) close(pdata); 1397 pdata = -1; 1398 perror_reply(425, "Can't open passive connection"); 1399 return; 1400 } 1401 1402 /* 1403 * Generate unique name for file with basename "local". 1404 * The file named "local" is already known to exist. 1405 * Generates failure reply on error. 1406 */ 1407 static char * 1408 gunique(local) 1409 char *local; 1410 { 1411 static char new[MAXPATHLEN]; 1412 struct stat st; 1413 int count; 1414 char *cp; 1415 1416 cp = rindex(local, '/'); 1417 if (cp) 1418 *cp = '\0'; 1419 if (stat(cp ? local : ".", &st) < 0) { 1420 perror_reply(553, cp ? local : "."); 1421 return((char *) 0); 1422 } 1423 if (cp) 1424 *cp = '/'; 1425 (void) strcpy(new, local); 1426 cp = new + strlen(new); 1427 *cp++ = '.'; 1428 for (count = 1; count < 100; count++) { 1429 (void)sprintf(cp, "%d", count); 1430 if (stat(new, &st) < 0) 1431 return(new); 1432 } 1433 reply(452, "Unique file name cannot be created."); 1434 return(NULL); 1435 } 1436 1437 /* 1438 * Format and send reply containing system error number. 1439 */ 1440 void 1441 perror_reply(code, string) 1442 int code; 1443 char *string; 1444 { 1445 reply(code, "%s: %s.", string, strerror(errno)); 1446 } 1447 1448 static char *onefile[] = { 1449 "", 1450 0 1451 }; 1452 1453 void 1454 send_file_list(whichfiles) 1455 char *whichfiles; 1456 { 1457 struct stat st; 1458 DIR *dirp = NULL; 1459 struct dirent *dir; 1460 FILE *dout = NULL; 1461 register char **dirlist, *dirname; 1462 int simple = 0; 1463 1464 if (strpbrk(whichfiles, "~{[*?") != NULL) { 1465 extern char *globerr; 1466 1467 globerr = NULL; 1468 dirlist = ftpglob(whichfiles); 1469 if (globerr != NULL) { 1470 reply(550, globerr); 1471 return; 1472 } else if (dirlist == NULL) { 1473 errno = ENOENT; 1474 perror_reply(550, whichfiles); 1475 return; 1476 } 1477 } else { 1478 onefile[0] = whichfiles; 1479 dirlist = onefile; 1480 simple = 1; 1481 } 1482 1483 if (setjmp(urgcatch)) { 1484 transflag = 0; 1485 return; 1486 } 1487 while (dirname = *dirlist++) { 1488 if (stat(dirname, &st) < 0) { 1489 /* 1490 * If user typed "ls -l", etc, and the client 1491 * used NLST, do what the user meant. 1492 */ 1493 if (dirname[0] == '-' && *dirlist == NULL && 1494 transflag == 0) { 1495 retrieve("/bin/ls %s", dirname); 1496 return; 1497 } 1498 perror_reply(550, whichfiles); 1499 if (dout != NULL) { 1500 (void) fclose(dout); 1501 transflag = 0; 1502 data = -1; 1503 pdata = -1; 1504 } 1505 return; 1506 } 1507 1508 if ((st.st_mode&S_IFMT) == S_IFREG) { 1509 if (dout == NULL) { 1510 dout = dataconn("file list", (off_t)-1, "w"); 1511 if (dout == NULL) 1512 return; 1513 transflag++; 1514 } 1515 fprintf(dout, "%s%s\n", dirname, 1516 type == TYPE_A ? "\r" : ""); 1517 byte_count += strlen(dirname) + 1; 1518 continue; 1519 } else if ((st.st_mode&S_IFMT) != S_IFDIR) 1520 continue; 1521 1522 if ((dirp = opendir(dirname)) == NULL) 1523 continue; 1524 1525 while ((dir = readdir(dirp)) != NULL) { 1526 char nbuf[MAXPATHLEN]; 1527 1528 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 1529 continue; 1530 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 1531 dir->d_namlen == 2) 1532 continue; 1533 1534 sprintf(nbuf, "%s/%s", dirname, dir->d_name); 1535 1536 /* 1537 * We have to do a stat to insure it's 1538 * not a directory or special file. 1539 */ 1540 if (simple || (stat(nbuf, &st) == 0 && 1541 (st.st_mode&S_IFMT) == S_IFREG)) { 1542 if (dout == NULL) { 1543 dout = dataconn("file list", (off_t)-1, 1544 "w"); 1545 if (dout == NULL) 1546 return; 1547 transflag++; 1548 } 1549 if (nbuf[0] == '.' && nbuf[1] == '/') 1550 fprintf(dout, "%s%s\n", &nbuf[2], 1551 type == TYPE_A ? "\r" : ""); 1552 else 1553 fprintf(dout, "%s%s\n", nbuf, 1554 type == TYPE_A ? "\r" : ""); 1555 byte_count += strlen(nbuf) + 1; 1556 } 1557 } 1558 (void) closedir(dirp); 1559 } 1560 1561 if (dout == NULL) 1562 reply(550, "No files found."); 1563 else if (ferror(dout) != 0) 1564 perror_reply(550, "Data connection"); 1565 else 1566 reply(226, "Transfer complete."); 1567 1568 transflag = 0; 1569 if (dout != NULL) 1570 (void) fclose(dout); 1571 data = -1; 1572 pdata = -1; 1573 } 1574 1575 #ifdef SETPROCTITLE 1576 /* 1577 * Clobber argv so ps will show what we're doing. (Stolen from sendmail.) 1578 * Warning, since this is usually started from inetd.conf, it often doesn't 1579 * have much of an environment or arglist to overwrite. 1580 */ 1581 void 1582 #if __STDC__ 1583 setproctitle(const char *fmt, ...) 1584 #else 1585 setproctitle(fmt, va_alist) 1586 char *fmt; 1587 va_dcl 1588 #endif 1589 { 1590 register char *p, *bp, ch; 1591 register int i; 1592 va_list ap; 1593 char buf[BUFSIZ]; 1594 #if __STDC__ 1595 va_start(ap, fmt); 1596 #else 1597 va_start(ap); 1598 #endif 1599 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 1600 1601 /* make ps print our process name */ 1602 p = Argv[0]; 1603 *p++ = '-'; 1604 1605 i = strlen(buf); 1606 if (i > LastArgv - p - 2) { 1607 i = LastArgv - p - 2; 1608 buf[i] = '\0'; 1609 } 1610 bp = buf; 1611 while (ch = *bp++) 1612 if (ch != '\n' && ch != '\r') 1613 *p++ = ch; 1614 while (p < LastArgv) 1615 *p++ = ' '; 1616 } 1617 #endif /* SETPROCTITLE */ 1618