1 /* $NetBSD: util.c,v 1.103 2000/11/15 00:11:04 lukem Exp $ */ 2 3 /*- 4 * Copyright (c) 1997-2000 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Luke Mewburn. 9 * 10 * This code is derived from software contributed to The NetBSD Foundation 11 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 12 * NASA Ames Research Center. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions 16 * are met: 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 2. Redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution. 22 * 3. All advertising materials mentioning features or use of this software 23 * must display the following acknowledgement: 24 * This product includes software developed by the NetBSD 25 * Foundation, Inc. and its contributors. 26 * 4. Neither the name of The NetBSD Foundation nor the names of its 27 * contributors may be used to endorse or promote products derived 28 * from this software without specific prior written permission. 29 * 30 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 31 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 32 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 33 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 34 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 35 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 36 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 37 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 38 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 39 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 40 * POSSIBILITY OF SUCH DAMAGE. 41 */ 42 43 /* 44 * Copyright (c) 1985, 1989, 1993, 1994 45 * The Regents of the University of California. All rights reserved. 46 * 47 * Redistribution and use in source and binary forms, with or without 48 * modification, are permitted provided that the following conditions 49 * are met: 50 * 1. Redistributions of source code must retain the above copyright 51 * notice, this list of conditions and the following disclaimer. 52 * 2. Redistributions in binary form must reproduce the above copyright 53 * notice, this list of conditions and the following disclaimer in the 54 * documentation and/or other materials provided with the distribution. 55 * 3. All advertising materials mentioning features or use of this software 56 * must display the following acknowledgement: 57 * This product includes software developed by the University of 58 * California, Berkeley and its contributors. 59 * 4. Neither the name of the University nor the names of its contributors 60 * may be used to endorse or promote products derived from this software 61 * without specific prior written permission. 62 * 63 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 64 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 65 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 66 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 67 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 68 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 69 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 70 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 71 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 72 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 73 * SUCH DAMAGE. 74 */ 75 76 #include <sys/cdefs.h> 77 #ifndef lint 78 __RCSID("$NetBSD: util.c,v 1.103 2000/11/15 00:11:04 lukem Exp $"); 79 #endif /* not lint */ 80 81 /* 82 * FTP User Program -- Misc support routines 83 */ 84 #include <sys/types.h> 85 #include <sys/socket.h> 86 #include <sys/ioctl.h> 87 #include <sys/time.h> 88 #include <netinet/in.h> 89 #include <arpa/ftp.h> 90 91 #include <ctype.h> 92 #include <err.h> 93 #include <errno.h> 94 #include <fcntl.h> 95 #include <glob.h> 96 #include <signal.h> 97 #include <limits.h> 98 #include <netdb.h> 99 #include <stdio.h> 100 #include <stdlib.h> 101 #include <string.h> 102 #include <termios.h> 103 #include <time.h> 104 #include <tzfile.h> 105 #include <unistd.h> 106 107 #include "ftp_var.h" 108 109 /* 110 * Connect to peer server and auto-login, if possible. 111 */ 112 void 113 setpeer(int argc, char *argv[]) 114 { 115 char *host; 116 char *port; 117 118 if (argc == 0) 119 goto usage; 120 if (connected) { 121 fprintf(ttyout, "Already connected to %s, use close first.\n", 122 hostname); 123 code = -1; 124 return; 125 } 126 if (argc < 2) 127 (void)another(&argc, &argv, "to"); 128 if (argc < 2 || argc > 3) { 129 usage: 130 fprintf(ttyout, "usage: %s host-name [port]\n", argv[0]); 131 code = -1; 132 return; 133 } 134 if (gatemode) 135 port = gateport; 136 else 137 port = ftpport; 138 if (argc > 2) 139 port = argv[2]; 140 141 if (gatemode) { 142 if (gateserver == NULL || *gateserver == '\0') 143 errx(1, "gateserver not defined (shouldn't happen)"); 144 host = hookup(gateserver, port); 145 } else 146 host = hookup(argv[1], port); 147 148 if (host) { 149 if (gatemode && verbose) { 150 fprintf(ttyout, 151 "Connecting via pass-through server %s\n", 152 gateserver); 153 } 154 155 connected = 1; 156 /* 157 * Set up defaults for FTP. 158 */ 159 (void)strlcpy(typename, "ascii", sizeof(typename)); 160 type = TYPE_A; 161 curtype = TYPE_A; 162 (void)strlcpy(formname, "non-print", sizeof(formname)); 163 form = FORM_N; 164 (void)strlcpy(modename, "stream", sizeof(modename)); 165 mode = MODE_S; 166 (void)strlcpy(structname, "file", sizeof(structname)); 167 stru = STRU_F; 168 (void)strlcpy(bytename, "8", sizeof(bytename)); 169 bytesize = 8; 170 if (autologin) 171 (void)ftp_login(argv[1], NULL, NULL); 172 } 173 } 174 175 static void 176 parse_feat(const char *line) 177 { 178 179 if (strcasecmp(line, " MDTM") == 0) 180 features[FEAT_MDTM] = 1; 181 else if (strncasecmp(line, " MLST", sizeof(" MLST") - 1) == 0) { 182 features[FEAT_MLST] = 1; 183 } else if (strcasecmp(line, " REST STREAM") == 0) 184 features[FEAT_REST_STREAM] = 1; 185 else if (strcasecmp(line, " SIZE") == 0) 186 features[FEAT_SIZE] = 1; 187 else if (strcasecmp(line, " TVFS") == 0) 188 features[FEAT_TVFS] = 1; 189 } 190 191 /* 192 * Determine the remote system type (SYST) and features (FEAT). 193 * Call after a successful login (i.e, connected = -1) 194 */ 195 void 196 getremoteinfo(void) 197 { 198 int overbose, i; 199 200 overbose = verbose; 201 if (debug == 0) 202 verbose = -1; 203 204 /* determine remote system type */ 205 if (command("SYST") == COMPLETE) { 206 if (overbose) { 207 char *cp, c; 208 209 c = 0; 210 cp = strchr(reply_string + 4, ' '); 211 if (cp == NULL) 212 cp = strchr(reply_string + 4, '\r'); 213 if (cp) { 214 if (cp[-1] == '.') 215 cp--; 216 c = *cp; 217 *cp = '\0'; 218 } 219 220 fprintf(ttyout, "Remote system type is %s.\n", 221 reply_string + 4); 222 if (cp) 223 *cp = c; 224 } 225 if (!strncmp(reply_string, "215 UNIX Type: L8", 17)) { 226 if (proxy) 227 unix_proxy = 1; 228 else 229 unix_server = 1; 230 /* 231 * Set type to 0 (not specified by user), 232 * meaning binary by default, but don't bother 233 * telling server. We can use binary 234 * for text files unless changed by the user. 235 */ 236 type = 0; 237 (void)strlcpy(typename, "binary", sizeof(typename)); 238 if (overbose) 239 fprintf(ttyout, 240 "Using %s mode to transfer files.\n", 241 typename); 242 } else { 243 if (proxy) 244 unix_proxy = 0; 245 else 246 unix_server = 0; 247 if (overbose && 248 !strncmp(reply_string, "215 TOPS20", 10)) 249 fputs( 250 "Remember to set tenex mode when transferring binary files from this machine.\n", 251 ttyout); 252 } 253 } 254 255 /* determine features (if any) */ 256 for (i = 0; i < FEAT_max; i++) 257 features[i] = -1; 258 reply_callback = parse_feat; 259 if (command("FEAT") == COMPLETE) { 260 for (i = 0; i < FEAT_max; i++) { 261 if (features[i] == -1) 262 features[i] = 0; 263 } 264 features[FEAT_FEAT] = 1; 265 } else 266 features[FEAT_FEAT] = 0; 267 if (debug) 268 for (i = 0; i < FEAT_max; i++) 269 printf("features[%d] = %d\n", i, features[i]); 270 reply_callback = NULL; 271 272 verbose = overbose; 273 } 274 275 /* 276 * Reset the various variables that indicate connection state back to 277 * disconnected settings. 278 * The caller is responsible for issuing any commands to the remote server 279 * to perform a clean shutdown before this is invoked. 280 */ 281 void 282 cleanuppeer(void) 283 { 284 285 if (cout) 286 (void)fclose(cout); 287 cout = NULL; 288 connected = 0; 289 unix_server = 0; 290 unix_proxy = 0; 291 /* 292 * determine if anonftp was specifically set with -a 293 * (1), or implicitly set by auto_fetch() (2). in the 294 * latter case, disable after the current xfer 295 */ 296 if (anonftp == 2) 297 anonftp = 0; 298 data = -1; 299 epsv4bad = 0; 300 if (username) 301 free(username); 302 username = NULL; 303 if (!proxy) 304 macnum = 0; 305 } 306 307 /* 308 * Top-level signal handler for interrupted commands. 309 */ 310 void 311 intr(int dummy) 312 { 313 314 alarmtimer(0); 315 if (fromatty) 316 write(fileno(ttyout), "\n", 1); 317 siglongjmp(toplevel, 1); 318 } 319 320 /* 321 * Signal handler for lost connections; cleanup various elements of 322 * the connection state, and call cleanuppeer() to finish it off. 323 */ 324 void 325 lostpeer(int dummy) 326 { 327 int oerrno = errno; 328 329 alarmtimer(0); 330 if (connected) { 331 if (cout != NULL) { 332 (void)shutdown(fileno(cout), 1+1); 333 (void)fclose(cout); 334 cout = NULL; 335 } 336 if (data >= 0) { 337 (void)shutdown(data, 1+1); 338 (void)close(data); 339 data = -1; 340 } 341 connected = 0; 342 } 343 pswitch(1); 344 if (connected) { 345 if (cout != NULL) { 346 (void)shutdown(fileno(cout), 1+1); 347 (void)fclose(cout); 348 cout = NULL; 349 } 350 connected = 0; 351 } 352 proxflag = 0; 353 pswitch(0); 354 cleanuppeer(); 355 errno = oerrno; 356 } 357 358 359 /* 360 * Login to remote host, using given username & password if supplied. 361 * Return non-zero if successful. 362 */ 363 int 364 ftp_login(const char *host, const char *user, const char *pass) 365 { 366 char tmp[80]; 367 const char *acct; 368 int n, aflag, rval, freeuser, freepass, freeacct; 369 370 acct = NULL; 371 aflag = rval = freeuser = freepass = freeacct = 0; 372 373 if (debug) 374 fprintf(ttyout, "ftp_login: user `%s' pass `%s' host `%s'\n", 375 user ? user : "<null>", pass ? pass : "<null>", 376 host ? host : "<null>"); 377 378 379 /* 380 * Set up arguments for an anonymous FTP session, if necessary. 381 */ 382 if (anonftp) { 383 user = "anonymous"; /* as per RFC 1635 */ 384 pass = getoptionvalue("anonpass"); 385 } 386 387 if (user == NULL) 388 freeuser = 1; 389 if (pass == NULL) 390 freepass = 1; 391 freeacct = 1; 392 if (ruserpass(host, &user, &pass, &acct) < 0) { 393 code = -1; 394 goto cleanup_ftp_login; 395 } 396 397 while (user == NULL) { 398 if (localname) 399 fprintf(ttyout, "Name (%s:%s): ", host, localname); 400 else 401 fprintf(ttyout, "Name (%s): ", host); 402 *tmp = '\0'; 403 if (fgets(tmp, sizeof(tmp) - 1, stdin) == NULL) { 404 fprintf(ttyout, "\nEOF received; login aborted.\n"); 405 clearerr(stdin); 406 code = -1; 407 goto cleanup_ftp_login; 408 } 409 tmp[strlen(tmp) - 1] = '\0'; 410 freeuser = 0; 411 if (*tmp == '\0') 412 user = localname; 413 else 414 user = tmp; 415 } 416 417 if (gatemode) { 418 char *nuser; 419 int len; 420 421 len = strlen(user) + 1 + strlen(host) + 1; 422 nuser = xmalloc(len); 423 (void)strlcpy(nuser, user, len); 424 (void)strlcat(nuser, "@", len); 425 (void)strlcat(nuser, host, len); 426 freeuser = 1; 427 user = nuser; 428 } 429 430 n = command("USER %s", user); 431 if (n == CONTINUE) { 432 if (pass == NULL) { 433 freepass = 0; 434 pass = getpass("Password:"); 435 } 436 n = command("PASS %s", pass); 437 } 438 if (n == CONTINUE) { 439 aflag++; 440 if (acct == NULL) { 441 freeacct = 0; 442 acct = getpass("Account:"); 443 } 444 if (acct[0] == '\0') { 445 warnx("Login failed."); 446 goto cleanup_ftp_login; 447 } 448 n = command("ACCT %s", acct); 449 } 450 if ((n != COMPLETE) || 451 (!aflag && acct != NULL && command("ACCT %s", acct) != COMPLETE)) { 452 warnx("Login failed."); 453 goto cleanup_ftp_login; 454 } 455 rval = 1; 456 username = xstrdup(user); 457 if (proxy) 458 goto cleanup_ftp_login; 459 460 connected = -1; 461 getremoteinfo(); 462 for (n = 0; n < macnum; ++n) { 463 if (!strcmp("init", macros[n].mac_name)) { 464 (void)strlcpy(line, "$init", sizeof(line)); 465 makeargv(); 466 domacro(margc, margv); 467 break; 468 } 469 } 470 updateremotepwd(); 471 472 cleanup_ftp_login: 473 if (user != NULL && freeuser) 474 free((char *)user); 475 if (pass != NULL && freepass) 476 free((char *)pass); 477 if (acct != NULL && freeacct) 478 free((char *)acct); 479 return (rval); 480 } 481 482 /* 483 * `another' gets another argument, and stores the new argc and argv. 484 * It reverts to the top level (via intr()) on EOF/error. 485 * 486 * Returns false if no new arguments have been added. 487 */ 488 int 489 another(int *pargc, char ***pargv, const char *prompt) 490 { 491 int len = strlen(line), ret; 492 493 if (len >= sizeof(line) - 3) { 494 fputs("sorry, arguments too long.\n", ttyout); 495 intr(0); 496 } 497 fprintf(ttyout, "(%s) ", prompt); 498 line[len++] = ' '; 499 if (fgets(&line[len], sizeof(line) - len, stdin) == NULL) { 500 clearerr(stdin); 501 intr(0); 502 } 503 len += strlen(&line[len]); 504 if (len > 0 && line[len - 1] == '\n') 505 line[len - 1] = '\0'; 506 makeargv(); 507 ret = margc > *pargc; 508 *pargc = margc; 509 *pargv = margv; 510 return (ret); 511 } 512 513 /* 514 * glob files given in argv[] from the remote server. 515 * if errbuf isn't NULL, store error messages there instead 516 * of writing to the screen. 517 */ 518 char * 519 remglob(char *argv[], int doswitch, char **errbuf) 520 { 521 char temp[MAXPATHLEN]; 522 static char buf[MAXPATHLEN]; 523 static FILE *ftemp = NULL; 524 static char **args; 525 int oldverbose, oldhash, fd, len; 526 char *cp, *mode; 527 528 if (!mflag || !connected) { 529 if (!doglob) 530 args = NULL; 531 else { 532 if (ftemp) { 533 (void)fclose(ftemp); 534 ftemp = NULL; 535 } 536 } 537 return (NULL); 538 } 539 if (!doglob) { 540 if (args == NULL) 541 args = argv; 542 if ((cp = *++args) == NULL) 543 args = NULL; 544 return (cp); 545 } 546 if (ftemp == NULL) { 547 len = strlcpy(temp, tmpdir, sizeof(temp)); 548 if (temp[len - 1] != '/') 549 (void)strlcat(temp, "/", sizeof(temp)); 550 (void)strlcat(temp, TMPFILE, sizeof(temp)); 551 if ((fd = mkstemp(temp)) < 0) { 552 warn("unable to create temporary file %s", temp); 553 return (NULL); 554 } 555 close(fd); 556 oldverbose = verbose; 557 verbose = (errbuf != NULL) ? -1 : 0; 558 oldhash = hash; 559 hash = 0; 560 if (doswitch) 561 pswitch(!proxy); 562 for (mode = "w"; *++argv != NULL; mode = "a") 563 recvrequest("NLST", temp, *argv, mode, 0, 0); 564 if ((code / 100) != COMPLETE) { 565 if (errbuf != NULL) 566 *errbuf = reply_string; 567 } 568 if (doswitch) 569 pswitch(!proxy); 570 verbose = oldverbose; 571 hash = oldhash; 572 ftemp = fopen(temp, "r"); 573 (void)unlink(temp); 574 if (ftemp == NULL) { 575 if (errbuf == NULL) 576 fputs( 577 "can't find list of remote files, oops.\n", 578 ttyout); 579 else 580 *errbuf = 581 "can't find list of remote files, oops."; 582 return (NULL); 583 } 584 } 585 if (fgets(buf, sizeof(buf), ftemp) == NULL) { 586 (void)fclose(ftemp); 587 ftemp = NULL; 588 return (NULL); 589 } 590 if ((cp = strchr(buf, '\n')) != NULL) 591 *cp = '\0'; 592 return (buf); 593 } 594 595 /* 596 * Glob a local file name specification with the expectation of a single 597 * return value. Can't control multiple values being expanded from the 598 * expression, we return only the first. 599 * Returns NULL on error, or a pointer to a buffer containing the filename 600 * that's the caller's responsiblity to free(3) when finished with. 601 */ 602 char * 603 globulize(const char *pattern) 604 { 605 glob_t gl; 606 int flags; 607 char *p; 608 609 if (!doglob) 610 return (xstrdup(pattern)); 611 612 flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 613 memset(&gl, 0, sizeof(gl)); 614 if (glob(pattern, flags, NULL, &gl) || gl.gl_pathc == 0) { 615 warnx("%s: not found", pattern); 616 globfree(&gl); 617 return (NULL); 618 } 619 p = xstrdup(gl.gl_pathv[0]); 620 globfree(&gl); 621 return (p); 622 } 623 624 /* 625 * determine size of remote file 626 */ 627 off_t 628 remotesize(const char *file, int noisy) 629 { 630 int overbose, r; 631 off_t size; 632 633 overbose = verbose; 634 size = -1; 635 if (debug == 0) 636 verbose = -1; 637 if (! features[FEAT_SIZE]) { 638 if (noisy) 639 fprintf(ttyout, 640 "SIZE is not supported by remote server.\n"); 641 goto cleanup_remotesize; 642 } 643 r = command("SIZE %s", file); 644 if (r == COMPLETE) { 645 char *cp, *ep; 646 647 cp = strchr(reply_string, ' '); 648 if (cp != NULL) { 649 cp++; 650 size = STRTOLL(cp, &ep, 10); 651 if (*ep != '\0' && !isspace((unsigned char)*ep)) 652 size = -1; 653 } 654 } else { 655 if (r == ERROR && code == 500 && features[FEAT_SIZE] == -1) 656 features[FEAT_SIZE] = 0; 657 if (noisy && debug == 0) { 658 fputs(reply_string, ttyout); 659 putc('\n', ttyout); 660 } 661 } 662 cleanup_remotesize: 663 verbose = overbose; 664 return (size); 665 } 666 667 /* 668 * determine last modification time (in GMT) of remote file 669 */ 670 time_t 671 remotemodtime(const char *file, int noisy) 672 { 673 int overbose, ocode, r; 674 time_t rtime; 675 676 overbose = verbose; 677 ocode = code; 678 rtime = -1; 679 if (debug == 0) 680 verbose = -1; 681 if (! features[FEAT_MDTM]) { 682 if (noisy) 683 fprintf(ttyout, 684 "MDTM is not supported by remote server.\n"); 685 goto cleanup_parse_time; 686 } 687 r = command("MDTM %s", file); 688 if (r == COMPLETE) { 689 struct tm timebuf; 690 char *timestr, *frac; 691 int yy, mo, day, hour, min, sec; 692 693 /* 694 * time-val = 14DIGIT [ "." 1*DIGIT ] 695 * YYYYMMDDHHMMSS[.sss] 696 * mdtm-response = "213" SP time-val CRLF / error-response 697 */ 698 timestr = reply_string + 4; 699 700 /* 701 * parse fraction. 702 * XXX: ignored for now 703 */ 704 frac = strchr(timestr, '\r'); 705 if (frac != NULL) 706 *frac = '\0'; 707 frac = strchr(timestr, '.'); 708 if (frac != NULL) 709 *frac++ = '\0'; 710 if (strlen(timestr) == 15 && strncmp(timestr, "191", 3) == 0) { 711 /* 712 * XXX: Workaround for lame ftpd's that return 713 * `19100' instead of `2000' 714 */ 715 fprintf(ttyout, 716 "Y2K warning! Incorrect time-val `%s' received from server.\n", 717 timestr); 718 timestr++; 719 timestr[0] = '2'; 720 timestr[1] = '0'; 721 fprintf(ttyout, "Converted to `%s'\n", timestr); 722 } 723 if (strlen(timestr) != 14 || 724 sscanf(timestr, "%04d%02d%02d%02d%02d%02d", 725 &yy, &mo, &day, &hour, &min, &sec) != 6) { 726 bad_parse_time: 727 fprintf(ttyout, "Can't parse time `%s'.\n", timestr); 728 goto cleanup_parse_time; 729 } 730 memset(&timebuf, 0, sizeof(timebuf)); 731 timebuf.tm_sec = sec; 732 timebuf.tm_min = min; 733 timebuf.tm_hour = hour; 734 timebuf.tm_mday = day; 735 timebuf.tm_mon = mo - 1; 736 timebuf.tm_year = yy - TM_YEAR_BASE; 737 timebuf.tm_isdst = -1; 738 rtime = timegm(&timebuf); 739 if (rtime == -1) { 740 if (noisy || debug != 0) 741 goto bad_parse_time; 742 else 743 goto cleanup_parse_time; 744 } else if (debug) 745 fprintf(ttyout, "parsed date as: %s", ctime(&rtime)); 746 } else { 747 if (r == ERROR && code == 500 && features[FEAT_MDTM] == -1) 748 features[FEAT_MDTM] = 0; 749 if (noisy && debug == 0) { 750 fputs(reply_string, ttyout); 751 putc('\n', ttyout); 752 } 753 } 754 cleanup_parse_time: 755 verbose = overbose; 756 if (rtime == -1) 757 code = ocode; 758 return (rtime); 759 } 760 761 /* 762 * update global `remotepwd', which contains the state of the remote cwd 763 */ 764 void 765 updateremotepwd(void) 766 { 767 int overbose, ocode, i; 768 char *cp; 769 770 overbose = verbose; 771 ocode = code; 772 if (debug == 0) 773 verbose = -1; 774 if (command("PWD") != COMPLETE) 775 goto badremotepwd; 776 cp = strchr(reply_string, ' '); 777 if (cp == NULL || cp[0] == '\0' || cp[1] != '"') 778 goto badremotepwd; 779 cp += 2; 780 for (i = 0; *cp && i < sizeof(remotepwd) - 1; i++, cp++) { 781 if (cp[0] == '"') { 782 if (cp[1] == '"') 783 cp++; 784 else 785 break; 786 } 787 remotepwd[i] = *cp; 788 } 789 remotepwd[i] = '\0'; 790 if (debug) 791 fprintf(ttyout, "got remotepwd as `%s'\n", remotepwd); 792 goto cleanupremotepwd; 793 badremotepwd: 794 remotepwd[0]='\0'; 795 cleanupremotepwd: 796 verbose = overbose; 797 code = ocode; 798 } 799 800 #ifndef NO_PROGRESS 801 802 /* 803 * return non-zero if we're the current foreground process 804 */ 805 int 806 foregroundproc(void) 807 { 808 static pid_t pgrp = -1; 809 810 if (pgrp == -1) 811 pgrp = getpgrp(); 812 813 return (tcgetpgrp(fileno(ttyout)) == pgrp); 814 } 815 816 817 static void updateprogressmeter(int); 818 819 /* 820 * SIGALRM handler to update the progress meter 821 */ 822 static void 823 updateprogressmeter(int dummy) 824 { 825 int oerrno = errno; 826 827 progressmeter(0); 828 errno = oerrno; 829 } 830 #endif /* NO_PROGRESS */ 831 832 833 /* 834 * List of order of magnitude prefixes. 835 * The last is `P', as 2^64 = 16384 Petabytes 836 */ 837 static const char prefixes[] = " KMGTP"; 838 839 /* 840 * Display a transfer progress bar if progress is non-zero. 841 * SIGALRM is hijacked for use by this function. 842 * - Before the transfer, set filesize to size of file (or -1 if unknown), 843 * and call with flag = -1. This starts the once per second timer, 844 * and a call to updateprogressmeter() upon SIGALRM. 845 * - During the transfer, updateprogressmeter will call progressmeter 846 * with flag = 0 847 * - After the transfer, call with flag = 1 848 */ 849 static struct timeval start; 850 static struct timeval lastupdate; 851 852 #define BUFLEFT (sizeof(buf) - len) 853 854 void 855 progressmeter(int flag) 856 { 857 static off_t lastsize; 858 #ifndef NO_PROGRESS 859 struct timeval now, td, wait; 860 off_t cursize, abbrevsize, bytespersec; 861 double elapsed; 862 int ratio, barlength, i, len, remaining; 863 864 /* 865 * Work variables for progress bar. 866 * 867 * XXX: if the format of the progress bar changes 868 * (especially the number of characters in the 869 * `static' portion of it), be sure to update 870 * these appropriately. 871 */ 872 char buf[256]; /* workspace for progress bar */ 873 #define BAROVERHEAD 43 /* non `*' portion of progress bar */ 874 /* 875 * stars should contain at least 876 * sizeof(buf) - BAROVERHEAD entries 877 */ 878 const char stars[] = 879 "*****************************************************************************" 880 "*****************************************************************************" 881 "*****************************************************************************"; 882 883 #endif 884 885 if (flag == -1) { 886 (void)gettimeofday(&start, NULL); 887 lastupdate = start; 888 lastsize = restart_point; 889 } 890 #ifndef NO_PROGRESS 891 len = 0; 892 if (!progress || filesize <= 0) 893 return; 894 895 /* 896 * print progress bar only if we are foreground process. 897 */ 898 if (! foregroundproc()) 899 return; 900 901 (void)gettimeofday(&now, NULL); 902 cursize = bytes + restart_point; 903 timersub(&now, &lastupdate, &wait); 904 if (cursize > lastsize) { 905 lastupdate = now; 906 lastsize = cursize; 907 wait.tv_sec = 0; 908 } 909 910 ratio = (int)((double)cursize * 100.0 / (double)filesize); 911 ratio = MAX(ratio, 0); 912 ratio = MIN(ratio, 100); 913 len += snprintf(buf + len, BUFLEFT, "\r%3d%% ", ratio); 914 915 /* 916 * calculate the length of the `*' bar, ensuring that 917 * the number of stars won't exceed the buffer size 918 */ 919 barlength = MIN(sizeof(buf) - 1, ttywidth) - BAROVERHEAD; 920 if (barlength > 0) { 921 i = barlength * ratio / 100; 922 len += snprintf(buf + len, BUFLEFT, 923 "|%.*s%*s|", i, stars, barlength - i, ""); 924 } 925 926 abbrevsize = cursize; 927 for (i = 0; abbrevsize >= 100000 && i < sizeof(prefixes); i++) 928 abbrevsize >>= 10; 929 len += snprintf(buf + len, BUFLEFT, " " LLFP("5") " %c%c ", 930 (LLT)abbrevsize, 931 prefixes[i], 932 i == 0 ? ' ' : 'B'); 933 934 timersub(&now, &start, &td); 935 elapsed = td.tv_sec + (td.tv_usec / 1000000.0); 936 937 bytespersec = 0; 938 if (bytes > 0) { 939 bytespersec = bytes; 940 if (elapsed > 0.0) 941 bytespersec /= elapsed; 942 } 943 for (i = 1; bytespersec >= 1024000 && i < sizeof(prefixes); i++) 944 bytespersec >>= 10; 945 len += snprintf(buf + len, BUFLEFT, 946 " " LLFP("3") ".%02d %cB/s ", 947 (LLT)(bytespersec / 1024), 948 (int)((bytespersec % 1024) * 100 / 1024), 949 prefixes[i]); 950 951 if (bytes <= 0 || elapsed <= 0.0 || cursize > filesize) { 952 len += snprintf(buf + len, BUFLEFT, " --:-- ETA"); 953 } else if (wait.tv_sec >= STALLTIME) { 954 len += snprintf(buf + len, BUFLEFT, " - stalled -"); 955 } else { 956 remaining = (int) 957 ((filesize - restart_point) / (bytes / elapsed) - elapsed); 958 if (remaining >= 100 * SECSPERHOUR) 959 len += snprintf(buf + len, BUFLEFT, " --:-- ETA"); 960 else { 961 i = remaining / SECSPERHOUR; 962 if (i) 963 len += snprintf(buf + len, BUFLEFT, "%2d:", i); 964 else 965 len += snprintf(buf + len, BUFLEFT, " "); 966 i = remaining % SECSPERHOUR; 967 len += snprintf(buf + len, BUFLEFT, 968 "%02d:%02d ETA", i / 60, i % 60); 969 } 970 } 971 if (flag == 1) 972 len += snprintf(buf + len, BUFLEFT, "\n"); 973 (void)write(fileno(ttyout), buf, len); 974 975 if (flag == -1) { 976 (void)xsignal_restart(SIGALRM, updateprogressmeter, 1); 977 alarmtimer(1); /* set alarm timer for 1 Hz */ 978 } else if (flag == 1) { 979 (void)xsignal(SIGALRM, SIG_DFL); 980 alarmtimer(0); 981 } 982 #endif /* !NO_PROGRESS */ 983 } 984 985 /* 986 * Display transfer statistics. 987 * Requires start to be initialised by progressmeter(-1), 988 * direction to be defined by xfer routines, and filesize and bytes 989 * to be updated by xfer routines 990 * If siginfo is nonzero, an ETA is displayed, and the output goes to stderr 991 * instead of ttyout. 992 */ 993 void 994 ptransfer(int siginfo) 995 { 996 struct timeval now, td, wait; 997 double elapsed; 998 off_t bytespersec; 999 int remaining, hh, i, len; 1000 1001 char buf[256]; /* Work variable for transfer status. */ 1002 1003 if (!verbose && !progress && !siginfo) 1004 return; 1005 1006 (void)gettimeofday(&now, NULL); 1007 timersub(&now, &start, &td); 1008 elapsed = td.tv_sec + (td.tv_usec / 1000000.0); 1009 bytespersec = 0; 1010 if (bytes > 0) { 1011 bytespersec = bytes; 1012 if (elapsed > 0.0) 1013 bytespersec /= elapsed; 1014 } 1015 len = 0; 1016 len += snprintf(buf + len, BUFLEFT, LLF " byte%s %s in ", 1017 (LLT)bytes, bytes == 1 ? "" : "s", direction); 1018 remaining = (int)elapsed; 1019 if (remaining > SECSPERDAY) { 1020 int days; 1021 1022 days = remaining / SECSPERDAY; 1023 remaining %= SECSPERDAY; 1024 len += snprintf(buf + len, BUFLEFT, 1025 "%d day%s ", days, days == 1 ? "" : "s"); 1026 } 1027 hh = remaining / SECSPERHOUR; 1028 remaining %= SECSPERHOUR; 1029 if (hh) 1030 len += snprintf(buf + len, BUFLEFT, "%2d:", hh); 1031 len += snprintf(buf + len, BUFLEFT, 1032 "%02d:%02d ", remaining / 60, remaining % 60); 1033 1034 for (i = 1; bytespersec >= 1024000 && i < sizeof(prefixes); i++) 1035 bytespersec >>= 10; 1036 len += snprintf(buf + len, BUFLEFT, "(" LLF ".%02d %cB/s)", 1037 (LLT)(bytespersec / 1024), 1038 (int)((bytespersec % 1024) * 100 / 1024), 1039 prefixes[i]); 1040 1041 if (siginfo && bytes > 0 && elapsed > 0.0 && filesize >= 0 1042 && bytes + restart_point <= filesize) { 1043 remaining = (int)((filesize - restart_point) / 1044 (bytes / elapsed) - elapsed); 1045 hh = remaining / SECSPERHOUR; 1046 remaining %= SECSPERHOUR; 1047 len += snprintf(buf + len, BUFLEFT, " ETA: "); 1048 if (hh) 1049 len += snprintf(buf + len, BUFLEFT, "%2d:", hh); 1050 len += snprintf(buf + len, BUFLEFT, "%02d:%02d", 1051 remaining / 60, remaining % 60); 1052 timersub(&now, &lastupdate, &wait); 1053 if (wait.tv_sec >= STALLTIME) 1054 len += snprintf(buf + len, BUFLEFT, " (stalled)"); 1055 } 1056 len += snprintf(buf + len, BUFLEFT, "\n"); 1057 (void)write(siginfo ? STDERR_FILENO : fileno(ttyout), buf, len); 1058 } 1059 1060 /* 1061 * SIG{INFO,QUIT} handler to print transfer stats if a transfer is in progress 1062 */ 1063 void 1064 psummary(int notused) 1065 { 1066 int oerrno = errno; 1067 1068 if (bytes > 0) { 1069 if (fromatty) 1070 write(fileno(ttyout), "\n", 1); 1071 ptransfer(1); 1072 } 1073 errno = oerrno; 1074 } 1075 1076 /* 1077 * List words in stringlist, vertically arranged 1078 */ 1079 void 1080 list_vertical(StringList *sl) 1081 { 1082 int i, j, w; 1083 int columns, width, lines; 1084 char *p; 1085 1086 width = 0; 1087 1088 for (i = 0 ; i < sl->sl_cur ; i++) { 1089 w = strlen(sl->sl_str[i]); 1090 if (w > width) 1091 width = w; 1092 } 1093 width = (width + 8) &~ 7; 1094 1095 columns = ttywidth / width; 1096 if (columns == 0) 1097 columns = 1; 1098 lines = (sl->sl_cur + columns - 1) / columns; 1099 for (i = 0; i < lines; i++) { 1100 for (j = 0; j < columns; j++) { 1101 p = sl->sl_str[j * lines + i]; 1102 if (p) 1103 fputs(p, ttyout); 1104 if (j * lines + i + lines >= sl->sl_cur) { 1105 putc('\n', ttyout); 1106 break; 1107 } 1108 w = strlen(p); 1109 while (w < width) { 1110 w = (w + 8) &~ 7; 1111 (void)putc('\t', ttyout); 1112 } 1113 } 1114 } 1115 } 1116 1117 /* 1118 * Update the global ttywidth value, using TIOCGWINSZ. 1119 */ 1120 void 1121 setttywidth(int a) 1122 { 1123 struct winsize winsize; 1124 int oerrno = errno; 1125 1126 if (ioctl(fileno(ttyout), TIOCGWINSZ, &winsize) != -1 && 1127 winsize.ws_col != 0) 1128 ttywidth = winsize.ws_col; 1129 else 1130 ttywidth = 80; 1131 errno = oerrno; 1132 } 1133 1134 /* 1135 * Change the rate limit up (SIGUSR1) or down (SIGUSR2) 1136 */ 1137 void 1138 crankrate(int sig) 1139 { 1140 1141 switch (sig) { 1142 case SIGUSR1: 1143 if (rate_get) 1144 rate_get += rate_get_incr; 1145 if (rate_put) 1146 rate_put += rate_put_incr; 1147 break; 1148 case SIGUSR2: 1149 if (rate_get && rate_get > rate_get_incr) 1150 rate_get -= rate_get_incr; 1151 if (rate_put && rate_put > rate_put_incr) 1152 rate_put -= rate_put_incr; 1153 break; 1154 default: 1155 err(1, "crankrate invoked with unknown signal: %d", sig); 1156 } 1157 } 1158 1159 1160 /* 1161 * Set the SIGALRM interval timer for wait seconds, 0 to disable. 1162 */ 1163 void 1164 alarmtimer(int wait) 1165 { 1166 struct itimerval itv; 1167 1168 itv.it_value.tv_sec = wait; 1169 itv.it_value.tv_usec = 0; 1170 itv.it_interval = itv.it_value; 1171 setitimer(ITIMER_REAL, &itv, NULL); 1172 } 1173 1174 /* 1175 * Setup or cleanup EditLine structures 1176 */ 1177 #ifndef NO_EDITCOMPLETE 1178 void 1179 controlediting(void) 1180 { 1181 if (editing && el == NULL && hist == NULL) { 1182 HistEvent ev; 1183 int editmode; 1184 1185 el = el_init(__progname, stdin, ttyout, stderr); 1186 /* init editline */ 1187 hist = history_init(); /* init the builtin history */ 1188 history(hist, &ev, H_SETSIZE, 100);/* remember 100 events */ 1189 el_set(el, EL_HIST, history, hist); /* use history */ 1190 1191 el_set(el, EL_EDITOR, "emacs"); /* default editor is emacs */ 1192 el_set(el, EL_PROMPT, prompt); /* set the prompt functions */ 1193 el_set(el, EL_RPROMPT, rprompt); 1194 1195 /* add local file completion, bind to TAB */ 1196 el_set(el, EL_ADDFN, "ftp-complete", 1197 "Context sensitive argument completion", 1198 complete); 1199 el_set(el, EL_BIND, "^I", "ftp-complete", NULL); 1200 el_source(el, NULL); /* read ~/.editrc */ 1201 if ((el_get(el, EL_EDITMODE, &editmode) != -1) && editmode == 0) 1202 editing = 0; /* the user doesn't want editing, 1203 * so disable, and let statement 1204 * below cleanup */ 1205 else 1206 el_set(el, EL_SIGNAL, 1); 1207 } 1208 if (!editing) { 1209 if (hist) { 1210 history_end(hist); 1211 hist = NULL; 1212 } 1213 if (el) { 1214 el_end(el); 1215 el = NULL; 1216 } 1217 } 1218 } 1219 #endif /* !NO_EDITCOMPLETE */ 1220 1221 /* 1222 * Convert the string `arg' to an int, which may have an optional SI suffix 1223 * (`b', `k', `m', `g'). Returns the number for success, -1 otherwise. 1224 */ 1225 int 1226 strsuftoi(const char *arg) 1227 { 1228 char *cp; 1229 long val; 1230 1231 if (!isdigit((unsigned char)arg[0])) 1232 return (-1); 1233 1234 val = strtol(arg, &cp, 10); 1235 if (cp != NULL) { 1236 if (cp[0] != '\0' && cp[1] != '\0') 1237 return (-1); 1238 switch (tolower((unsigned char)cp[0])) { 1239 case '\0': 1240 case 'b': 1241 break; 1242 case 'k': 1243 val <<= 10; 1244 break; 1245 case 'm': 1246 val <<= 20; 1247 break; 1248 case 'g': 1249 val <<= 30; 1250 break; 1251 default: 1252 return (-1); 1253 } 1254 } 1255 if (val < 0 || val > INT_MAX) 1256 return (-1); 1257 1258 return (val); 1259 } 1260 1261 /* 1262 * Set up socket buffer sizes before a connection is made. 1263 */ 1264 void 1265 setupsockbufsize(int sock) 1266 { 1267 1268 if (setsockopt(sock, SOL_SOCKET, SO_SNDBUF, (void *) &sndbuf_size, 1269 sizeof(rcvbuf_size)) < 0) 1270 warn("unable to set sndbuf size %d", sndbuf_size); 1271 1272 if (setsockopt(sock, SOL_SOCKET, SO_RCVBUF, (void *) &rcvbuf_size, 1273 sizeof(rcvbuf_size)) < 0) 1274 warn("unable to set rcvbuf size %d", rcvbuf_size); 1275 } 1276 1277 /* 1278 * Copy characters from src into dst, \ quoting characters that require it 1279 */ 1280 void 1281 ftpvis(char *dst, size_t dstlen, const char *src, size_t srclen) 1282 { 1283 int di, si; 1284 1285 for (di = si = 0; 1286 src[si] != '\0' && di < dstlen && si < srclen; 1287 di++, si++) { 1288 switch (src[si]) { 1289 case '\\': 1290 case ' ': 1291 case '\t': 1292 case '\r': 1293 case '\n': 1294 case '"': 1295 dst[di++] = '\\'; 1296 if (di >= dstlen) 1297 break; 1298 /* FALLTHROUGH */ 1299 default: 1300 dst[di] = src[si]; 1301 } 1302 } 1303 dst[di] = '\0'; 1304 } 1305 1306 /* 1307 * Copy src into buf (which is len bytes long), expanding % sequences. 1308 */ 1309 void 1310 formatbuf(char *buf, size_t len, const char *src) 1311 { 1312 const char *p; 1313 char *p2, *q; 1314 int i, op, updirs, pdirs; 1315 1316 #define ADDBUF(x) do { \ 1317 if (i >= len - 1) \ 1318 goto endbuf; \ 1319 buf[i++] = (x); \ 1320 } while (0) 1321 1322 p = src; 1323 for (i = 0; *p; p++) { 1324 if (*p != '%') { 1325 ADDBUF(*p); 1326 continue; 1327 } 1328 p++; 1329 1330 switch (op = *p) { 1331 1332 case '/': 1333 case '.': 1334 case 'c': 1335 p2 = connected ? remotepwd : ""; 1336 updirs = pdirs = 0; 1337 1338 /* option to determine fixed # of dirs from path */ 1339 if (op == '.' || op == 'c') { 1340 int skip; 1341 1342 q = p2; 1343 while (*p2) /* calc # of /'s */ 1344 if (*p2++ == '/') 1345 updirs++; 1346 if (p[1] == '0') { /* print <x> or ... */ 1347 pdirs = 1; 1348 p++; 1349 } 1350 if (p[1] >= '1' && p[1] <= '9') { 1351 /* calc # to skip */ 1352 skip = p[1] - '0'; 1353 p++; 1354 } else 1355 skip = 1; 1356 1357 updirs -= skip; 1358 while (skip-- > 0) { 1359 while ((p2 > q) && (*p2 != '/')) 1360 p2--; /* back up */ 1361 if (skip && p2 > q) 1362 p2--; 1363 } 1364 if (*p2 == '/' && p2 != q) 1365 p2++; 1366 } 1367 1368 if (updirs > 0 && pdirs) { 1369 if (i >= len - 5) 1370 break; 1371 if (op == '.') { 1372 ADDBUF('.'); 1373 ADDBUF('.'); 1374 ADDBUF('.'); 1375 } else { 1376 ADDBUF('/'); 1377 ADDBUF('<'); 1378 if (updirs > 9) { 1379 ADDBUF('9'); 1380 ADDBUF('+'); 1381 } else 1382 ADDBUF('0' + updirs); 1383 ADDBUF('>'); 1384 } 1385 } 1386 for (; *p2; p2++) 1387 ADDBUF(*p2); 1388 break; 1389 1390 case 'M': 1391 case 'm': 1392 for (p2 = connected ? hostname : "-"; *p2; p2++) { 1393 if (op == 'm' && *p2 == '.') 1394 break; 1395 ADDBUF(*p2); 1396 } 1397 break; 1398 1399 case 'n': 1400 for (p2 = connected ? username : "-"; *p2 ; p2++) 1401 ADDBUF(*p2); 1402 break; 1403 1404 case '%': 1405 ADDBUF('%'); 1406 break; 1407 1408 default: /* display unknown codes literally */ 1409 ADDBUF('%'); 1410 ADDBUF(op); 1411 break; 1412 1413 } 1414 } 1415 endbuf: 1416 buf[i] = '\0'; 1417 } 1418 1419 /* 1420 * Parse `port' into a TCP port number, defaulting to `defport' if `port' is 1421 * an unknown service name. If defport != -1, print a warning upon bad parse. 1422 */ 1423 int 1424 parseport(const char *port, int defport) 1425 { 1426 int rv; 1427 long nport; 1428 char *p, *ep; 1429 1430 p = xstrdup(port); 1431 nport = strtol(p, &ep, 10); 1432 if (*ep != '\0' && ep == p) { 1433 struct servent *svp; 1434 1435 svp = getservbyname(port, "tcp"); 1436 if (svp == NULL) { 1437 badparseport: 1438 if (defport != -1) 1439 warnx("Unknown port `%s', using port %d", 1440 port, defport); 1441 rv = defport; 1442 } else 1443 rv = ntohs(svp->s_port); 1444 } else if (nport < 1 || nport > MAX_IN_PORT_T || *ep != '\0') 1445 goto badparseport; 1446 else 1447 rv = nport; 1448 free(p); 1449 return (rv); 1450 } 1451 1452 /* 1453 * Determine if given string is an IPv6 address or not. 1454 * Return 1 for yes, 0 for no 1455 */ 1456 int 1457 isipv6addr(const char *addr) 1458 { 1459 int rv = 0; 1460 #ifdef INET6 1461 struct addrinfo hints, *res; 1462 1463 memset(&hints, 0, sizeof(hints)); 1464 hints.ai_family = PF_INET6; 1465 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 1466 hints.ai_flags = AI_NUMERICHOST; 1467 if (getaddrinfo(addr, "0", &hints, &res) != 0) 1468 rv = 0; 1469 else { 1470 rv = 1; 1471 freeaddrinfo(res); 1472 } 1473 if (debug) 1474 fprintf(ttyout, "isipv6addr: got %d for %s\n", rv, addr); 1475 #endif 1476 return (rv == 1) ? 1 : 0; 1477 } 1478 1479 1480 /* 1481 * Internal version of connect(2); sets socket buffer sizes first. 1482 */ 1483 int 1484 xconnect(int sock, const struct sockaddr *name, int namelen) 1485 { 1486 1487 setupsockbufsize(sock); 1488 return (connect(sock, name, namelen)); 1489 } 1490 1491 /* 1492 * Internal version of listen(2); sets socket buffer sizes first. 1493 */ 1494 int 1495 xlisten(int sock, int backlog) 1496 { 1497 1498 setupsockbufsize(sock); 1499 return (listen(sock, backlog)); 1500 } 1501 1502 /* 1503 * malloc() with inbuilt error checking 1504 */ 1505 void * 1506 xmalloc(size_t size) 1507 { 1508 void *p; 1509 1510 p = malloc(size); 1511 if (p == NULL) 1512 err(1, "Unable to allocate %ld bytes of memory", (long)size); 1513 return (p); 1514 } 1515 1516 /* 1517 * sl_init() with inbuilt error checking 1518 */ 1519 StringList * 1520 xsl_init(void) 1521 { 1522 StringList *p; 1523 1524 p = sl_init(); 1525 if (p == NULL) 1526 err(1, "Unable to allocate memory for stringlist"); 1527 return (p); 1528 } 1529 1530 /* 1531 * sl_add() with inbuilt error checking 1532 */ 1533 void 1534 xsl_add(StringList *sl, char *i) 1535 { 1536 1537 if (sl_add(sl, i) == -1) 1538 err(1, "Unable to add `%s' to stringlist", i); 1539 } 1540 1541 /* 1542 * strdup() with inbuilt error checking 1543 */ 1544 char * 1545 xstrdup(const char *str) 1546 { 1547 char *s; 1548 1549 if (str == NULL) 1550 errx(1, "xstrdup() called with NULL argument"); 1551 s = strdup(str); 1552 if (s == NULL) 1553 err(1, "Unable to allocate memory for string copy"); 1554 return (s); 1555 } 1556 1557 /* 1558 * Install a POSIX signal handler, allowing the invoker to set whether 1559 * the signal should be restartable or not 1560 */ 1561 sigfunc 1562 xsignal_restart(int sig, sigfunc func, int restartable) 1563 { 1564 struct sigaction act, oact; 1565 act.sa_handler = func; 1566 1567 sigemptyset(&act.sa_mask); 1568 #if defined(SA_RESTART) /* 4.4BSD, Posix(?), SVR4 */ 1569 act.sa_flags = restartable ? SA_RESTART : 0; 1570 #elif defined(SA_INTERRUPT) /* SunOS 4.x */ 1571 act.sa_flags = restartable ? 0 : SA_INTERRUPT; 1572 #else 1573 #error "system must have SA_RESTART or SA_INTERRUPT" 1574 #endif 1575 if (sigaction(sig, &act, &oact) < 0) 1576 return (SIG_ERR); 1577 return (oact.sa_handler); 1578 } 1579 1580 /* 1581 * Install a signal handler with the `restartable' flag set dependent upon 1582 * which signal is being set. (This is a wrapper to xsignal_restart()) 1583 */ 1584 sigfunc 1585 xsignal(int sig, sigfunc func) 1586 { 1587 int restartable; 1588 1589 /* 1590 * Some signals print output or change the state of the process. 1591 * There should be restartable, so that reads and writes are 1592 * not affected. Some signals should cause program flow to change; 1593 * these signals should not be restartable, so that the system call 1594 * will return with EINTR, and the program will go do something 1595 * different. If the signal handler calls longjmp() or siglongjmp(), 1596 * it doesn't matter if it's restartable. 1597 */ 1598 1599 switch(sig) { 1600 #ifdef SIGINFO 1601 case SIGINFO: 1602 #endif 1603 case SIGQUIT: 1604 case SIGUSR1: 1605 case SIGUSR2: 1606 case SIGWINCH: 1607 restartable = 1; 1608 break; 1609 1610 case SIGALRM: 1611 case SIGINT: 1612 case SIGPIPE: 1613 restartable = 0; 1614 break; 1615 1616 default: 1617 /* 1618 * This is unpleasant, but I don't know what would be better. 1619 * Right now, this "can't happen" 1620 */ 1621 errx(1, "xsignal_restart called with signal %d", sig); 1622 } 1623 1624 return(xsignal_restart(sig, func, restartable)); 1625 } 1626