1 /* 2 * Copyright (c) 1985, 1988, 1990, 1992, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #ifndef lint 9 static char copyright[] = 10 "@(#) Copyright (c) 1985, 1988, 1990, 1992, 1993\n\ 11 The Regents of the University of California. All rights reserved.\n"; 12 #endif /* not lint */ 13 14 #ifndef lint 15 static char sccsid[] = "@(#)ftpd.c 8.1 (Berkeley) 06/04/93"; 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 int receive_data __P((FILE *, FILE *)); 146 static void send_data __P((FILE *, FILE *, off_t)); 147 static struct passwd * 148 sgetpwnam __P((char *)); 149 static char *sgetsave __P((char *)); 150 151 static char * 152 curdir() 153 { 154 static char path[MAXPATHLEN+1+1]; /* path + '/' + '\0' */ 155 156 if (getcwd(path, sizeof(path)-2) == NULL) 157 return (""); 158 if (path[1] != '\0') /* special case for root dir. */ 159 strcat(path, "/"); 160 /* For guest account, skip / since it's chrooted */ 161 return (guest ? path+1 : path); 162 } 163 164 int 165 main(argc, argv, envp) 166 int argc; 167 char *argv[]; 168 char **envp; 169 { 170 int addrlen, on = 1, tos; 171 char *cp, line[MAXLINE]; 172 FILE *fd; 173 174 /* 175 * LOG_NDELAY sets up the logging connection immediately, 176 * necessary for anonymous ftp's that chroot and can't do it later. 177 */ 178 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 179 addrlen = sizeof (his_addr); 180 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 181 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 182 exit(1); 183 } 184 addrlen = sizeof (ctrl_addr); 185 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 186 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 187 exit(1); 188 } 189 #ifdef IP_TOS 190 tos = IPTOS_LOWDELAY; 191 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, sizeof(int)) < 0) 192 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 193 #endif 194 data_source.sin_port = htons(ntohs(ctrl_addr.sin_port) - 1); 195 debug = 0; 196 #ifdef SETPROCTITLE 197 /* 198 * Save start and extent of argv for setproctitle. 199 */ 200 Argv = argv; 201 while (*envp) 202 envp++; 203 LastArgv = envp[-1] + strlen(envp[-1]); 204 #endif /* SETPROCTITLE */ 205 206 argc--, argv++; 207 while (argc > 0 && *argv[0] == '-') { 208 for (cp = &argv[0][1]; *cp; cp++) switch (*cp) { 209 210 case 'v': 211 debug = 1; 212 break; 213 214 case 'd': 215 debug = 1; 216 break; 217 218 case 'l': 219 logging++; /* > 1 == extra logging */ 220 break; 221 222 case 't': 223 timeout = atoi(++cp); 224 if (maxtimeout < timeout) 225 maxtimeout = timeout; 226 goto nextopt; 227 228 case 'T': 229 maxtimeout = atoi(++cp); 230 if (timeout > maxtimeout) 231 timeout = maxtimeout; 232 goto nextopt; 233 234 case 'u': 235 { 236 int val = 0; 237 238 while (*++cp && *cp >= '0' && *cp <= '9') 239 val = val*8 + *cp - '0'; 240 if (*cp) 241 fprintf(stderr, "ftpd: Bad value for -u\n"); 242 else 243 defumask = val; 244 goto nextopt; 245 } 246 247 default: 248 fprintf(stderr, "ftpd: Unknown flag -%c ignored.\n", 249 *cp); 250 break; 251 } 252 nextopt: 253 argc--, argv++; 254 } 255 (void) freopen(_PATH_DEVNULL, "w", stderr); 256 (void) signal(SIGPIPE, lostconn); 257 (void) signal(SIGCHLD, SIG_IGN); 258 if ((int)signal(SIGURG, myoob) < 0) 259 syslog(LOG_ERR, "signal: %m"); 260 261 /* Try to handle urgent data inline */ 262 #ifdef SO_OOBINLINE 263 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 264 syslog(LOG_ERR, "setsockopt: %m"); 265 #endif 266 267 #ifdef F_SETOWN 268 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 269 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 270 #endif 271 dolog(&his_addr); 272 /* 273 * Set up default state 274 */ 275 data = -1; 276 type = TYPE_A; 277 form = FORM_N; 278 stru = STRU_F; 279 mode = MODE_S; 280 tmpline[0] = '\0'; 281 282 /* If logins are disabled, print out the message. */ 283 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 284 while (fgets(line, sizeof (line), fd) != NULL) { 285 if ((cp = strchr(line, '\n')) != NULL) 286 *cp = '\0'; 287 lreply(530, "%s", line); 288 } 289 (void) fflush(stdout); 290 (void) fclose(fd); 291 reply(530, "System not available."); 292 exit(0); 293 } 294 if ((fd = fopen(_PATH_FTPWELCOME, "r")) != NULL) { 295 while (fgets(line, sizeof (line), fd) != NULL) { 296 if ((cp = strchr(line, '\n')) != NULL) 297 *cp = '\0'; 298 lreply(220, "%s", line); 299 } 300 (void) fflush(stdout); 301 (void) fclose(fd); 302 /* reply(220,) must follow */ 303 } 304 (void) gethostname(hostname, sizeof (hostname)); 305 reply(220, "%s FTP server (%s) ready.", hostname, version); 306 (void) setjmp(errcatch); 307 for (;;) 308 (void) yyparse(); 309 /* NOTREACHED */ 310 } 311 312 static void 313 lostconn(signo) 314 int signo; 315 { 316 if (debug) 317 syslog(LOG_DEBUG, "lost connection"); 318 dologout(-1); 319 } 320 321 static char ttyline[20]; 322 323 /* 324 * Helper function for sgetpwnam(). 325 */ 326 static char * 327 sgetsave(s) 328 char *s; 329 { 330 char *new = malloc((unsigned) strlen(s) + 1); 331 332 if (new == NULL) { 333 perror_reply(421, "Local resource failure: malloc"); 334 dologout(1); 335 /* NOTREACHED */ 336 } 337 (void) strcpy(new, s); 338 return (new); 339 } 340 341 /* 342 * Save the result of a getpwnam. Used for USER command, since 343 * the data returned must not be clobbered by any other command 344 * (e.g., globbing). 345 */ 346 static struct passwd * 347 sgetpwnam(name) 348 char *name; 349 { 350 static struct passwd save; 351 register struct passwd *p; 352 char *sgetsave(); 353 354 if ((p = getpwnam(name)) == NULL) 355 return (p); 356 if (save.pw_name) { 357 free(save.pw_name); 358 free(save.pw_passwd); 359 free(save.pw_gecos); 360 free(save.pw_dir); 361 free(save.pw_shell); 362 } 363 save = *p; 364 save.pw_name = sgetsave(p->pw_name); 365 save.pw_passwd = sgetsave(p->pw_passwd); 366 save.pw_gecos = sgetsave(p->pw_gecos); 367 save.pw_dir = sgetsave(p->pw_dir); 368 save.pw_shell = sgetsave(p->pw_shell); 369 return (&save); 370 } 371 372 static int login_attempts; /* number of failed login attempts */ 373 static int askpasswd; /* had user command, ask for passwd */ 374 static char curname[10]; /* current USER name */ 375 376 /* 377 * USER command. 378 * Sets global passwd pointer pw if named account exists and is acceptable; 379 * sets askpasswd if a PASS command is expected. If logged in previously, 380 * need to reset state. If name is "ftp" or "anonymous", the name is not in 381 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 382 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 383 * requesting login privileges. Disallow anyone who does not have a standard 384 * shell as returned by getusershell(). Disallow anyone mentioned in the file 385 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 386 */ 387 void 388 user(name) 389 char *name; 390 { 391 register char *cp; 392 char *shell; 393 394 if (logged_in) { 395 if (guest) { 396 reply(530, "Can't change user from guest login."); 397 return; 398 } 399 end_login(); 400 } 401 402 guest = 0; 403 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 404 if (checkuser("ftp") || checkuser("anonymous")) 405 reply(530, "User %s access denied.", name); 406 else if ((pw = sgetpwnam("ftp")) != NULL) { 407 guest = 1; 408 askpasswd = 1; 409 reply(331, 410 "Guest login ok, type your name as password."); 411 } else 412 reply(530, "User %s unknown.", name); 413 if (!askpasswd && logging) 414 syslog(LOG_NOTICE, 415 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 416 return; 417 } 418 if (pw = sgetpwnam(name)) { 419 if ((shell = pw->pw_shell) == NULL || *shell == 0) 420 shell = _PATH_BSHELL; 421 while ((cp = getusershell()) != NULL) 422 if (strcmp(cp, shell) == 0) 423 break; 424 endusershell(); 425 426 if (cp == NULL || checkuser(name)) { 427 reply(530, "User %s access denied.", name); 428 if (logging) 429 syslog(LOG_NOTICE, 430 "FTP LOGIN REFUSED FROM %s, %s", 431 remotehost, name); 432 pw = (struct passwd *) NULL; 433 return; 434 } 435 } 436 if (logging) 437 strncpy(curname, name, sizeof(curname)-1); 438 reply(331, "Password required for %s.", name); 439 askpasswd = 1; 440 /* 441 * Delay before reading passwd after first failed 442 * attempt to slow down passwd-guessing programs. 443 */ 444 if (login_attempts) 445 sleep((unsigned) login_attempts); 446 } 447 448 /* 449 * Check if a user is in the file _PATH_FTPUSERS 450 */ 451 static int 452 checkuser(name) 453 char *name; 454 { 455 register FILE *fd; 456 register char *p; 457 char line[BUFSIZ]; 458 int found = 0; 459 460 if ((fd = fopen(_PATH_FTPUSERS, "r")) != NULL) { 461 while (fgets(line, sizeof(line), fd) != NULL) 462 if ((p = strchr(line, '\n')) != NULL) { 463 *p = '\0'; 464 if (line[0] == '#') 465 continue; 466 if (strcmp(p, name) == 0) { 467 found = 1; 468 break; 469 } 470 } 471 (void) fclose(fd); 472 } 473 return (found); 474 } 475 476 /* 477 * Terminate login as previous user, if any, resetting state; 478 * used when USER command is given or login fails. 479 */ 480 static void 481 end_login() 482 { 483 484 (void) seteuid((uid_t)0); 485 if (logged_in) 486 logwtmp(ttyline, "", ""); 487 pw = NULL; 488 logged_in = 0; 489 guest = 0; 490 } 491 492 void 493 pass(passwd) 494 char *passwd; 495 { 496 char *xpasswd, *salt; 497 FILE *fd; 498 499 if (logged_in || askpasswd == 0) { 500 reply(503, "Login with USER first."); 501 return; 502 } 503 askpasswd = 0; 504 if (!guest) { /* "ftp" is only account allowed no password */ 505 if (pw == NULL) 506 salt = "xx"; 507 else 508 salt = pw->pw_passwd; 509 xpasswd = crypt(passwd, salt); 510 /* The strcmp does not catch null passwords! */ 511 if (pw == NULL || *pw->pw_passwd == '\0' || 512 strcmp(xpasswd, pw->pw_passwd)) { 513 reply(530, "Login incorrect."); 514 if (logging) 515 syslog(LOG_NOTICE, 516 "FTP LOGIN FAILED FROM %s, %s", 517 remotehost, curname); 518 pw = NULL; 519 if (login_attempts++ >= 5) { 520 syslog(LOG_NOTICE, 521 "repeated login failures from %s", 522 remotehost); 523 exit(0); 524 } 525 return; 526 } 527 } 528 login_attempts = 0; /* this time successful */ 529 if (setegid((gid_t)pw->pw_gid) < 0) { 530 reply(550, "Can't set gid."); 531 return; 532 } 533 (void) initgroups(pw->pw_name, pw->pw_gid); 534 535 /* open wtmp before chroot */ 536 (void)sprintf(ttyline, "ftp%d", getpid()); 537 logwtmp(ttyline, pw->pw_name, remotehost); 538 logged_in = 1; 539 540 if (guest) { 541 /* 542 * We MUST do a chdir() after the chroot. Otherwise 543 * the old current directory will be accessible as "." 544 * outside the new root! 545 */ 546 if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) { 547 reply(550, "Can't set guest privileges."); 548 goto bad; 549 } 550 } else if (chdir(pw->pw_dir) < 0) { 551 if (chdir("/") < 0) { 552 reply(530, "User %s: can't change directory to %s.", 553 pw->pw_name, pw->pw_dir); 554 goto bad; 555 } else 556 lreply(230, "No directory! Logging in with home=/"); 557 } 558 if (seteuid((uid_t)pw->pw_uid) < 0) { 559 reply(550, "Can't set uid."); 560 goto bad; 561 } 562 /* 563 * Display a login message, if it exists. 564 * N.B. reply(230,) must follow the message. 565 */ 566 if ((fd = fopen(_PATH_FTPLOGINMESG, "r")) != NULL) { 567 char *cp, line[MAXLINE]; 568 569 while (fgets(line, sizeof (line), fd) != NULL) { 570 if ((cp = strchr(line, '\n')) != NULL) 571 *cp = '\0'; 572 lreply(230, "%s", line); 573 } 574 (void) fflush(stdout); 575 (void) fclose(fd); 576 } 577 if (guest) { 578 reply(230, "Guest login ok, access restrictions apply."); 579 #ifdef SETPROCTITLE 580 sprintf(proctitle, "%s: anonymous/%.*s", remotehost, 581 sizeof(proctitle) - sizeof(remotehost) - 582 sizeof(": anonymous/"), passwd); 583 setproctitle(proctitle); 584 #endif /* SETPROCTITLE */ 585 if (logging) 586 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 587 remotehost, passwd); 588 home = "/"; /* guest home dir for globbing */ 589 } else { 590 reply(230, "User %s logged in.", pw->pw_name); 591 #ifdef SETPROCTITLE 592 sprintf(proctitle, "%s: %s", remotehost, pw->pw_name); 593 setproctitle(proctitle); 594 #endif /* SETPROCTITLE */ 595 if (logging) 596 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 597 remotehost, pw->pw_name); 598 home = pw->pw_dir; /* home dir for globbing */ 599 } 600 (void) umask(defumask); 601 return; 602 bad: 603 /* Forget all about it... */ 604 end_login(); 605 } 606 607 void 608 retrieve(cmd, name) 609 char *cmd, *name; 610 { 611 FILE *fin, *dout; 612 struct stat st; 613 int (*closefunc)(); 614 615 if (cmd == 0) { 616 fin = fopen(name, "r"), closefunc = fclose; 617 st.st_size = 0; 618 } else { 619 char line[BUFSIZ]; 620 621 (void) sprintf(line, cmd, name), name = line; 622 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 623 st.st_size = -1; 624 st.st_blksize = BUFSIZ; 625 } 626 if (fin == NULL) { 627 if (errno != 0) { 628 perror_reply(550, name); 629 if (cmd == 0) { 630 LOGCMD("get", name); 631 } 632 } 633 return; 634 } 635 byte_count = -1; 636 if (cmd == 0 && 637 (fstat(fileno(fin), &st) < 0 || (st.st_mode&S_IFMT) != S_IFREG)) { 638 reply(550, "%s: not a plain file.", name); 639 goto done; 640 } 641 if (restart_point) { 642 if (type == TYPE_A) { 643 register int i, n, c; 644 645 n = restart_point; 646 i = 0; 647 while (i++ < n) { 648 if ((c=getc(fin)) == EOF) { 649 perror_reply(550, name); 650 goto done; 651 } 652 if (c == '\n') 653 i++; 654 } 655 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 656 perror_reply(550, name); 657 goto done; 658 } 659 } 660 dout = dataconn(name, st.st_size, "w"); 661 if (dout == NULL) 662 goto done; 663 send_data(fin, dout, st.st_blksize); 664 (void) fclose(dout); 665 data = -1; 666 pdata = -1; 667 done: 668 if (cmd == 0) 669 LOGBYTES("get", name, byte_count); 670 (*closefunc)(fin); 671 } 672 673 void 674 store(name, mode, unique) 675 char *name, *mode; 676 int unique; 677 { 678 FILE *fout, *din; 679 struct stat st; 680 int (*closefunc)(); 681 682 if (unique && stat(name, &st) == 0 && 683 (name = gunique(name)) == NULL) { 684 LOGCMD(*mode == 'w' ? "put" : "append", name); 685 return; 686 } 687 688 if (restart_point) 689 mode = "r+w"; 690 fout = fopen(name, mode); 691 closefunc = fclose; 692 if (fout == NULL) { 693 perror_reply(553, name); 694 LOGCMD(*mode == 'w' ? "put" : "append", name); 695 return; 696 } 697 byte_count = -1; 698 if (restart_point) { 699 if (type == TYPE_A) { 700 register int i, n, c; 701 702 n = restart_point; 703 i = 0; 704 while (i++ < n) { 705 if ((c=getc(fout)) == EOF) { 706 perror_reply(550, name); 707 goto done; 708 } 709 if (c == '\n') 710 i++; 711 } 712 /* 713 * We must do this seek to "current" position 714 * because we are changing from reading to 715 * writing. 716 */ 717 if (fseek(fout, 0L, L_INCR) < 0) { 718 perror_reply(550, name); 719 goto done; 720 } 721 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 722 perror_reply(550, name); 723 goto done; 724 } 725 } 726 din = dataconn(name, (off_t)-1, "r"); 727 if (din == NULL) 728 goto done; 729 if (receive_data(din, fout) == 0) { 730 if (unique) 731 reply(226, "Transfer complete (unique file name:%s).", 732 name); 733 else 734 reply(226, "Transfer complete."); 735 } 736 (void) fclose(din); 737 data = -1; 738 pdata = -1; 739 done: 740 LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count); 741 (*closefunc)(fout); 742 } 743 744 static FILE * 745 getdatasock(mode) 746 char *mode; 747 { 748 int s, on = 1, tries; 749 int t; 750 751 if (data >= 0) 752 return (fdopen(data, mode)); 753 (void) seteuid((uid_t)0); 754 s = socket(AF_INET, SOCK_STREAM, 0); 755 if (s < 0) 756 goto bad; 757 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 758 (char *) &on, sizeof (on)) < 0) 759 goto bad; 760 /* anchor socket to avoid multi-homing problems */ 761 data_source.sin_family = AF_INET; 762 data_source.sin_addr = ctrl_addr.sin_addr; 763 for (tries = 1; ; tries++) { 764 if (bind(s, (struct sockaddr *)&data_source, 765 sizeof (data_source)) >= 0) 766 break; 767 if (errno != EADDRINUSE || tries > 10) 768 goto bad; 769 sleep(tries); 770 } 771 (void) seteuid((uid_t)pw->pw_uid); 772 #ifdef IP_TOS 773 on = IPTOS_THROUGHPUT; 774 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0) 775 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 776 #endif 777 return (fdopen(s, mode)); 778 bad: 779 /* Return the real value of errno (close may change it) */ 780 t = errno; 781 (void) seteuid((uid_t)pw->pw_uid); 782 (void) close(s); 783 errno = t; 784 return (NULL); 785 } 786 787 static FILE * 788 dataconn(name, size, mode) 789 char *name; 790 off_t size; 791 char *mode; 792 { 793 char sizebuf[32]; 794 FILE *file; 795 int retry = 0, tos; 796 797 file_size = size; 798 byte_count = 0; 799 if (size != (off_t) -1) 800 (void) sprintf (sizebuf, " (%qd bytes)", size); 801 else 802 (void) strcpy(sizebuf, ""); 803 if (pdata >= 0) { 804 struct sockaddr_in from; 805 int s, fromlen = sizeof(from); 806 807 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 808 if (s < 0) { 809 reply(425, "Can't open data connection."); 810 (void) close(pdata); 811 pdata = -1; 812 return(NULL); 813 } 814 (void) close(pdata); 815 pdata = s; 816 #ifdef IP_TOS 817 tos = IPTOS_LOWDELAY; 818 (void) setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&tos, 819 sizeof(int)); 820 #endif 821 reply(150, "Opening %s mode data connection for '%s'%s.", 822 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 823 return(fdopen(pdata, mode)); 824 } 825 if (data >= 0) { 826 reply(125, "Using existing data connection for '%s'%s.", 827 name, sizebuf); 828 usedefault = 1; 829 return (fdopen(data, mode)); 830 } 831 if (usedefault) 832 data_dest = his_addr; 833 usedefault = 1; 834 file = getdatasock(mode); 835 if (file == NULL) { 836 reply(425, "Can't create data socket (%s,%d): %s.", 837 inet_ntoa(data_source.sin_addr), 838 ntohs(data_source.sin_port), strerror(errno)); 839 return (NULL); 840 } 841 data = fileno(file); 842 while (connect(data, (struct sockaddr *)&data_dest, 843 sizeof (data_dest)) < 0) { 844 if (errno == EADDRINUSE && retry < swaitmax) { 845 sleep((unsigned) swaitint); 846 retry += swaitint; 847 continue; 848 } 849 perror_reply(425, "Can't build data connection"); 850 (void) fclose(file); 851 data = -1; 852 return (NULL); 853 } 854 reply(150, "Opening %s mode data connection for '%s'%s.", 855 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 856 return (file); 857 } 858 859 /* 860 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 861 * encapsulation of the data subject * to Mode, Structure, and Type. 862 * 863 * NB: Form isn't handled. 864 */ 865 static void 866 send_data(instr, outstr, blksize) 867 FILE *instr, *outstr; 868 off_t blksize; 869 { 870 register int c, cnt; 871 register char *buf; 872 int netfd, filefd; 873 874 transflag++; 875 if (setjmp(urgcatch)) { 876 transflag = 0; 877 return; 878 } 879 switch (type) { 880 881 case TYPE_A: 882 while ((c = getc(instr)) != EOF) { 883 byte_count++; 884 if (c == '\n') { 885 if (ferror(outstr)) 886 goto data_err; 887 (void) putc('\r', outstr); 888 } 889 (void) putc(c, outstr); 890 } 891 fflush(outstr); 892 transflag = 0; 893 if (ferror(instr)) 894 goto file_err; 895 if (ferror(outstr)) 896 goto data_err; 897 reply(226, "Transfer complete."); 898 return; 899 900 case TYPE_I: 901 case TYPE_L: 902 if ((buf = malloc((u_int)blksize)) == NULL) { 903 transflag = 0; 904 perror_reply(451, "Local resource failure: malloc"); 905 return; 906 } 907 netfd = fileno(outstr); 908 filefd = fileno(instr); 909 while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 && 910 write(netfd, buf, cnt) == cnt) 911 byte_count += cnt; 912 transflag = 0; 913 (void)free(buf); 914 if (cnt != 0) { 915 if (cnt < 0) 916 goto file_err; 917 goto data_err; 918 } 919 reply(226, "Transfer complete."); 920 return; 921 default: 922 transflag = 0; 923 reply(550, "Unimplemented TYPE %d in send_data", type); 924 return; 925 } 926 927 data_err: 928 transflag = 0; 929 perror_reply(426, "Data connection"); 930 return; 931 932 file_err: 933 transflag = 0; 934 perror_reply(551, "Error on input file"); 935 } 936 937 /* 938 * Transfer data from peer to "outstr" using the appropriate encapulation of 939 * the data subject to Mode, Structure, and Type. 940 * 941 * N.B.: Form isn't handled. 942 */ 943 static int 944 receive_data(instr, outstr) 945 FILE *instr, *outstr; 946 { 947 register int c; 948 int cnt, bare_lfs = 0; 949 char buf[BUFSIZ]; 950 951 transflag++; 952 if (setjmp(urgcatch)) { 953 transflag = 0; 954 return (-1); 955 } 956 switch (type) { 957 958 case TYPE_I: 959 case TYPE_L: 960 while ((cnt = read(fileno(instr), buf, sizeof buf)) > 0) { 961 if (write(fileno(outstr), buf, cnt) != cnt) 962 goto file_err; 963 byte_count += cnt; 964 } 965 if (cnt < 0) 966 goto data_err; 967 transflag = 0; 968 return (0); 969 970 case TYPE_E: 971 reply(553, "TYPE E not implemented."); 972 transflag = 0; 973 return (-1); 974 975 case TYPE_A: 976 while ((c = getc(instr)) != EOF) { 977 byte_count++; 978 if (c == '\n') 979 bare_lfs++; 980 while (c == '\r') { 981 if (ferror(outstr)) 982 goto data_err; 983 if ((c = getc(instr)) != '\n') { 984 (void) putc ('\r', outstr); 985 if (c == '\0' || c == EOF) 986 goto contin2; 987 } 988 } 989 (void) putc(c, outstr); 990 contin2: ; 991 } 992 fflush(outstr); 993 if (ferror(instr)) 994 goto data_err; 995 if (ferror(outstr)) 996 goto file_err; 997 transflag = 0; 998 if (bare_lfs) { 999 lreply(230, "WARNING! %d bare linefeeds received in ASCII mode", bare_lfs); 1000 printf(" File may not have transferred correctly.\r\n"); 1001 } 1002 return (0); 1003 default: 1004 reply(550, "Unimplemented TYPE %d in receive_data", type); 1005 transflag = 0; 1006 return (-1); 1007 } 1008 1009 data_err: 1010 transflag = 0; 1011 perror_reply(426, "Data Connection"); 1012 return (-1); 1013 1014 file_err: 1015 transflag = 0; 1016 perror_reply(452, "Error writing file"); 1017 return (-1); 1018 } 1019 1020 void 1021 statfilecmd(filename) 1022 char *filename; 1023 { 1024 char line[BUFSIZ]; 1025 FILE *fin; 1026 int c; 1027 1028 (void)snprintf(line, sizeof(line), "/bin/ls -lgA %s", filename); 1029 fin = ftpd_popen(line, "r"); 1030 lreply(211, "status of %s:", filename); 1031 while ((c = getc(fin)) != EOF) { 1032 if (c == '\n') { 1033 if (ferror(stdout)){ 1034 perror_reply(421, "control connection"); 1035 (void) ftpd_pclose(fin); 1036 dologout(1); 1037 /* NOTREACHED */ 1038 } 1039 if (ferror(fin)) { 1040 perror_reply(551, filename); 1041 (void) ftpd_pclose(fin); 1042 return; 1043 } 1044 (void) putc('\r', stdout); 1045 } 1046 (void) putc(c, stdout); 1047 } 1048 (void) ftpd_pclose(fin); 1049 reply(211, "End of Status"); 1050 } 1051 1052 void 1053 statcmd() 1054 { 1055 struct sockaddr_in *sin; 1056 u_char *a, *p; 1057 1058 lreply(211, "%s FTP server status:", hostname, version); 1059 printf(" %s\r\n", version); 1060 printf(" Connected to %s", remotehost); 1061 if (!isdigit(remotehost[0])) 1062 printf(" (%s)", inet_ntoa(his_addr.sin_addr)); 1063 printf("\r\n"); 1064 if (logged_in) { 1065 if (guest) 1066 printf(" Logged in anonymously\r\n"); 1067 else 1068 printf(" Logged in as %s\r\n", pw->pw_name); 1069 } else if (askpasswd) 1070 printf(" Waiting for password\r\n"); 1071 else 1072 printf(" Waiting for user name\r\n"); 1073 printf(" TYPE: %s", typenames[type]); 1074 if (type == TYPE_A || type == TYPE_E) 1075 printf(", FORM: %s", formnames[form]); 1076 if (type == TYPE_L) 1077 #if NBBY == 8 1078 printf(" %d", NBBY); 1079 #else 1080 printf(" %d", bytesize); /* need definition! */ 1081 #endif 1082 printf("; STRUcture: %s; transfer MODE: %s\r\n", 1083 strunames[stru], modenames[mode]); 1084 if (data != -1) 1085 printf(" Data connection open\r\n"); 1086 else if (pdata != -1) { 1087 printf(" in Passive mode"); 1088 sin = &pasv_addr; 1089 goto printaddr; 1090 } else if (usedefault == 0) { 1091 printf(" PORT"); 1092 sin = &data_dest; 1093 printaddr: 1094 a = (u_char *) &sin->sin_addr; 1095 p = (u_char *) &sin->sin_port; 1096 #define UC(b) (((int) b) & 0xff) 1097 printf(" (%d,%d,%d,%d,%d,%d)\r\n", UC(a[0]), 1098 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1099 #undef UC 1100 } else 1101 printf(" No data connection\r\n"); 1102 reply(211, "End of status"); 1103 } 1104 1105 void 1106 fatal(s) 1107 char *s; 1108 { 1109 reply(451, "Error in server: %s\n", s); 1110 reply(221, "Closing connection due to server error."); 1111 dologout(0); 1112 /* NOTREACHED */ 1113 } 1114 1115 void 1116 #if __STDC__ 1117 reply(int n, const char *fmt, ...) 1118 #else 1119 reply(n, fmt, va_alist) 1120 int n; 1121 char *fmt; 1122 va_dcl 1123 #endif 1124 { 1125 va_list ap; 1126 #if __STDC__ 1127 va_start(ap, fmt); 1128 #else 1129 va_start(ap); 1130 #endif 1131 (void)printf("%d ", n); 1132 (void)vprintf(fmt, ap); 1133 (void)printf("\r\n"); 1134 (void)fflush(stdout); 1135 if (debug) { 1136 syslog(LOG_DEBUG, "<--- %d ", n); 1137 vsyslog(LOG_DEBUG, fmt, ap); 1138 } 1139 } 1140 1141 void 1142 #if __STDC__ 1143 lreply(int n, const char *fmt, ...) 1144 #else 1145 lreply(n, fmt, va_alist) 1146 int n; 1147 char *fmt; 1148 va_dcl 1149 #endif 1150 { 1151 va_list ap; 1152 #if __STDC__ 1153 va_start(ap, fmt); 1154 #else 1155 va_start(ap); 1156 #endif 1157 (void)printf("%d- ", n); 1158 (void)vprintf(fmt, ap); 1159 (void)printf("\r\n"); 1160 (void)fflush(stdout); 1161 if (debug) { 1162 syslog(LOG_DEBUG, "<--- %d- ", n); 1163 vsyslog(LOG_DEBUG, fmt, ap); 1164 } 1165 } 1166 1167 static void 1168 ack(s) 1169 char *s; 1170 { 1171 reply(250, "%s command successful.", s); 1172 } 1173 1174 void 1175 nack(s) 1176 char *s; 1177 { 1178 reply(502, "%s command not implemented.", s); 1179 } 1180 1181 /* ARGSUSED */ 1182 char * 1183 yyerror(s) 1184 char *s; 1185 { 1186 char *cp; 1187 1188 if (cp = strchr(cbuf,'\n')) 1189 *cp = '\0'; 1190 reply(500, "'%s': command not understood.", cbuf); 1191 } 1192 1193 void 1194 delete(name) 1195 char *name; 1196 { 1197 struct stat st; 1198 1199 LOGCMD("delete", name); 1200 if (stat(name, &st) < 0) { 1201 perror_reply(550, name); 1202 return; 1203 } 1204 if ((st.st_mode&S_IFMT) == S_IFDIR) { 1205 if (rmdir(name) < 0) { 1206 perror_reply(550, name); 1207 return; 1208 } 1209 goto done; 1210 } 1211 if (unlink(name) < 0) { 1212 perror_reply(550, name); 1213 return; 1214 } 1215 done: 1216 ack("DELE"); 1217 } 1218 1219 void 1220 cwd(path) 1221 char *path; 1222 { 1223 if (chdir(path) < 0) 1224 perror_reply(550, path); 1225 else 1226 ack("CWD"); 1227 } 1228 1229 void 1230 makedir(name) 1231 char *name; 1232 { 1233 LOGCMD("mkdir", name); 1234 if (mkdir(name, 0777) < 0) 1235 perror_reply(550, name); 1236 else 1237 reply(257, "MKD command successful."); 1238 } 1239 1240 void 1241 removedir(name) 1242 char *name; 1243 { 1244 LOGCMD("rmdir", name); 1245 if (rmdir(name) < 0) 1246 perror_reply(550, name); 1247 else 1248 ack("RMD"); 1249 } 1250 1251 void 1252 pwd() 1253 { 1254 char path[MAXPATHLEN + 1]; 1255 1256 if (getwd(path) == (char *)NULL) 1257 reply(550, "%s.", path); 1258 else 1259 reply(257, "\"%s\" is current directory.", path); 1260 } 1261 1262 char * 1263 renamefrom(name) 1264 char *name; 1265 { 1266 struct stat st; 1267 1268 if (stat(name, &st) < 0) { 1269 perror_reply(550, name); 1270 return ((char *)0); 1271 } 1272 reply(350, "File exists, ready for destination name"); 1273 return (name); 1274 } 1275 1276 void 1277 renamecmd(from, to) 1278 char *from, *to; 1279 { 1280 LOGCMD2("rename", from, to); 1281 if (rename(from, to) < 0) 1282 perror_reply(550, "rename"); 1283 else 1284 ack("RNTO"); 1285 } 1286 1287 static void 1288 dolog(sin) 1289 struct sockaddr_in *sin; 1290 { 1291 struct hostent *hp = gethostbyaddr((char *)&sin->sin_addr, 1292 sizeof (struct in_addr), AF_INET); 1293 1294 if (hp) 1295 (void) strncpy(remotehost, hp->h_name, sizeof (remotehost)); 1296 else 1297 (void) strncpy(remotehost, inet_ntoa(sin->sin_addr), 1298 sizeof (remotehost)); 1299 #ifdef SETPROCTITLE 1300 sprintf(proctitle, "%s: connected", remotehost); 1301 setproctitle(proctitle); 1302 #endif /* SETPROCTITLE */ 1303 1304 if (logging) 1305 syslog(LOG_INFO, "connection from %s", remotehost); 1306 } 1307 1308 /* 1309 * Record logout in wtmp file 1310 * and exit with supplied status. 1311 */ 1312 void 1313 dologout(status) 1314 int status; 1315 { 1316 if (logged_in) { 1317 (void) seteuid((uid_t)0); 1318 logwtmp(ttyline, "", ""); 1319 } 1320 /* beware of flushing buffers after a SIGPIPE */ 1321 _exit(status); 1322 } 1323 1324 static void 1325 myoob(signo) 1326 int signo; 1327 { 1328 char *cp; 1329 1330 /* only process if transfer occurring */ 1331 if (!transflag) 1332 return; 1333 cp = tmpline; 1334 if (getline(cp, 7, stdin) == NULL) { 1335 reply(221, "You could at least say goodbye."); 1336 dologout(0); 1337 } 1338 upper(cp); 1339 if (strcmp(cp, "ABOR\r\n") == 0) { 1340 tmpline[0] = '\0'; 1341 reply(426, "Transfer aborted. Data connection closed."); 1342 reply(226, "Abort successful"); 1343 longjmp(urgcatch, 1); 1344 } 1345 if (strcmp(cp, "STAT\r\n") == 0) { 1346 if (file_size != (off_t) -1) 1347 reply(213, "Status: %qd of %qd bytes transferred", 1348 byte_count, file_size); 1349 else 1350 reply(213, "Status: %qd bytes transferred", byte_count); 1351 } 1352 } 1353 1354 /* 1355 * Note: a response of 425 is not mentioned as a possible response to 1356 * the PASV command in RFC959. However, it has been blessed as 1357 * a legitimate response by Jon Postel in a telephone conversation 1358 * with Rick Adams on 25 Jan 89. 1359 */ 1360 void 1361 passive() 1362 { 1363 int len; 1364 register char *p, *a; 1365 1366 pdata = socket(AF_INET, SOCK_STREAM, 0); 1367 if (pdata < 0) { 1368 perror_reply(425, "Can't open passive connection"); 1369 return; 1370 } 1371 pasv_addr = ctrl_addr; 1372 pasv_addr.sin_port = 0; 1373 (void) seteuid((uid_t)0); 1374 if (bind(pdata, (struct sockaddr *)&pasv_addr, sizeof(pasv_addr)) < 0) { 1375 (void) seteuid((uid_t)pw->pw_uid); 1376 goto pasv_error; 1377 } 1378 (void) seteuid((uid_t)pw->pw_uid); 1379 len = sizeof(pasv_addr); 1380 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 1381 goto pasv_error; 1382 if (listen(pdata, 1) < 0) 1383 goto pasv_error; 1384 a = (char *) &pasv_addr.sin_addr; 1385 p = (char *) &pasv_addr.sin_port; 1386 1387 #define UC(b) (((int) b) & 0xff) 1388 1389 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 1390 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1391 return; 1392 1393 pasv_error: 1394 (void) close(pdata); 1395 pdata = -1; 1396 perror_reply(425, "Can't open passive connection"); 1397 return; 1398 } 1399 1400 /* 1401 * Generate unique name for file with basename "local". 1402 * The file named "local" is already known to exist. 1403 * Generates failure reply on error. 1404 */ 1405 static char * 1406 gunique(local) 1407 char *local; 1408 { 1409 static char new[MAXPATHLEN]; 1410 struct stat st; 1411 int count; 1412 char *cp; 1413 1414 cp = strrchr(local, '/'); 1415 if (cp) 1416 *cp = '\0'; 1417 if (stat(cp ? local : ".", &st) < 0) { 1418 perror_reply(553, cp ? local : "."); 1419 return((char *) 0); 1420 } 1421 if (cp) 1422 *cp = '/'; 1423 (void) strcpy(new, local); 1424 cp = new + strlen(new); 1425 *cp++ = '.'; 1426 for (count = 1; count < 100; count++) { 1427 (void)sprintf(cp, "%d", count); 1428 if (stat(new, &st) < 0) 1429 return(new); 1430 } 1431 reply(452, "Unique file name cannot be created."); 1432 return(NULL); 1433 } 1434 1435 /* 1436 * Format and send reply containing system error number. 1437 */ 1438 void 1439 perror_reply(code, string) 1440 int code; 1441 char *string; 1442 { 1443 reply(code, "%s: %s.", string, strerror(errno)); 1444 } 1445 1446 static char *onefile[] = { 1447 "", 1448 0 1449 }; 1450 1451 void 1452 send_file_list(whichfiles) 1453 char *whichfiles; 1454 { 1455 struct stat st; 1456 DIR *dirp = NULL; 1457 struct dirent *dir; 1458 FILE *dout = NULL; 1459 register char **dirlist, *dirname; 1460 int simple = 0; 1461 1462 if (strpbrk(whichfiles, "~{[*?") != NULL) { 1463 extern char *globerr; 1464 1465 globerr = NULL; 1466 dirlist = ftpglob(whichfiles); 1467 if (globerr != NULL) { 1468 reply(550, globerr); 1469 return; 1470 } else if (dirlist == NULL) { 1471 errno = ENOENT; 1472 perror_reply(550, whichfiles); 1473 return; 1474 } 1475 } else { 1476 onefile[0] = whichfiles; 1477 dirlist = onefile; 1478 simple = 1; 1479 } 1480 1481 if (setjmp(urgcatch)) { 1482 transflag = 0; 1483 return; 1484 } 1485 while (dirname = *dirlist++) { 1486 if (stat(dirname, &st) < 0) { 1487 /* 1488 * If user typed "ls -l", etc, and the client 1489 * used NLST, do what the user meant. 1490 */ 1491 if (dirname[0] == '-' && *dirlist == NULL && 1492 transflag == 0) { 1493 retrieve("/bin/ls %s", dirname); 1494 return; 1495 } 1496 perror_reply(550, whichfiles); 1497 if (dout != NULL) { 1498 (void) fclose(dout); 1499 transflag = 0; 1500 data = -1; 1501 pdata = -1; 1502 } 1503 return; 1504 } 1505 1506 if ((st.st_mode&S_IFMT) == S_IFREG) { 1507 if (dout == NULL) { 1508 dout = dataconn("file list", (off_t)-1, "w"); 1509 if (dout == NULL) 1510 return; 1511 transflag++; 1512 } 1513 fprintf(dout, "%s%s\n", dirname, 1514 type == TYPE_A ? "\r" : ""); 1515 byte_count += strlen(dirname) + 1; 1516 continue; 1517 } else if ((st.st_mode&S_IFMT) != S_IFDIR) 1518 continue; 1519 1520 if ((dirp = opendir(dirname)) == NULL) 1521 continue; 1522 1523 while ((dir = readdir(dirp)) != NULL) { 1524 char nbuf[MAXPATHLEN]; 1525 1526 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 1527 continue; 1528 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 1529 dir->d_namlen == 2) 1530 continue; 1531 1532 sprintf(nbuf, "%s/%s", dirname, dir->d_name); 1533 1534 /* 1535 * We have to do a stat to insure it's 1536 * not a directory or special file. 1537 */ 1538 if (simple || (stat(nbuf, &st) == 0 && 1539 (st.st_mode&S_IFMT) == S_IFREG)) { 1540 if (dout == NULL) { 1541 dout = dataconn("file list", (off_t)-1, 1542 "w"); 1543 if (dout == NULL) 1544 return; 1545 transflag++; 1546 } 1547 if (nbuf[0] == '.' && nbuf[1] == '/') 1548 fprintf(dout, "%s%s\n", &nbuf[2], 1549 type == TYPE_A ? "\r" : ""); 1550 else 1551 fprintf(dout, "%s%s\n", nbuf, 1552 type == TYPE_A ? "\r" : ""); 1553 byte_count += strlen(nbuf) + 1; 1554 } 1555 } 1556 (void) closedir(dirp); 1557 } 1558 1559 if (dout == NULL) 1560 reply(550, "No files found."); 1561 else if (ferror(dout) != 0) 1562 perror_reply(550, "Data connection"); 1563 else 1564 reply(226, "Transfer complete."); 1565 1566 transflag = 0; 1567 if (dout != NULL) 1568 (void) fclose(dout); 1569 data = -1; 1570 pdata = -1; 1571 } 1572 1573 #ifdef SETPROCTITLE 1574 /* 1575 * Clobber argv so ps will show what we're doing. (Stolen from sendmail.) 1576 * Warning, since this is usually started from inetd.conf, it often doesn't 1577 * have much of an environment or arglist to overwrite. 1578 */ 1579 void 1580 #if __STDC__ 1581 setproctitle(const char *fmt, ...) 1582 #else 1583 setproctitle(fmt, va_alist) 1584 char *fmt; 1585 va_dcl 1586 #endif 1587 { 1588 register char *p, *bp, ch; 1589 register int i; 1590 va_list ap; 1591 char buf[BUFSIZ]; 1592 #if __STDC__ 1593 va_start(ap, fmt); 1594 #else 1595 va_start(ap); 1596 #endif 1597 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 1598 1599 /* make ps print our process name */ 1600 p = Argv[0]; 1601 *p++ = '-'; 1602 1603 i = strlen(buf); 1604 if (i > LastArgv - p - 2) { 1605 i = LastArgv - p - 2; 1606 buf[i] = '\0'; 1607 } 1608 bp = buf; 1609 while (ch = *bp++) 1610 if (ch != '\n' && ch != '\r') 1611 *p++ = ch; 1612 while (p < LastArgv) 1613 *p++ = ' '; 1614 } 1615 #endif /* SETPROCTITLE */ 1616