pcnfsd_misc.c revision 1.14
1 /* $NetBSD: pcnfsd_misc.c,v 1.14 2011/09/01 07:18:51 plunky Exp $ */ 2 3 /* RE_SID: @(%)/usr/dosnfs/shades_SCCS/unix/pcnfsd/v2/src/SCCS/s.pcnfsd_misc.c 1.5 92/01/24 19:59:13 SMI */ 4 /* 5 **===================================================================== 6 ** Copyright (c) 1986,1987,1988,1989,1990,1991 by Sun Microsystems, Inc. 7 ** @(#)pcnfsd_misc.c 1.5 1/24/92 8 **===================================================================== 9 */ 10 /* 11 **===================================================================== 12 ** I N C L U D E F I L E S E C T I O N * 13 ** * 14 ** If your port requires different include files, add a suitable * 15 ** #define in the customization section, and make the inclusion or * 16 ** exclusion of the files conditional on this. * 17 **===================================================================== 18 */ 19 20 #include <sys/file.h> 21 #include <sys/ioctl.h> 22 #include <sys/socket.h> 23 #include <sys/stat.h> 24 #include <sys/time.h> 25 #include <sys/wait.h> 26 27 #include <netinet/in.h> 28 #include <arpa/inet.h> 29 30 #include <ctype.h> 31 #include <errno.h> 32 #include <netdb.h> 33 #include <pwd.h> 34 #include <signal.h> 35 #include <stdio.h> 36 #include <stdlib.h> 37 #include <string.h> 38 #include <unistd.h> 39 #include <util.h> 40 41 #ifdef ISC_2_0 42 #include <sys/fcntl.h> 43 #endif 44 45 #ifdef SHADOW_SUPPORT 46 #include <shadow.h> 47 #endif 48 49 #ifdef WTMP 50 int wtmp_enabled = 1; 51 #endif 52 53 #include "common.h" 54 #include "pcnfsd.h" 55 #include "extern.h" 56 57 /* 58 **--------------------------------------------------------------------- 59 ** Other #define's 60 **--------------------------------------------------------------------- 61 */ 62 63 #define zchar 0x5b 64 65 char tempstr[256]; 66 67 char *mapfont __P((char, char, char)); 68 void myhandler __P((int)); 69 void start_watchdog __P((int)); 70 void stop_watchdog __P((void)); 71 72 /* 73 **===================================================================== 74 ** C O D E S E C T I O N * 75 **===================================================================== 76 */ 77 /* 78 **--------------------------------------------------------------------- 79 ** Support procedures 80 **--------------------------------------------------------------------- 81 */ 82 83 84 void 85 scramble(s1, s2) 86 char *s1; 87 char *s2; 88 { 89 while (*s1) { 90 *s2++ = (*s1 ^ zchar) & 0x7f; 91 s1++; 92 } 93 *s2 = 0; 94 } 95 96 97 98 struct passwd * 99 get_password(usrnam) 100 char *usrnam; 101 { 102 struct passwd *p; 103 static struct passwd localp; 104 __aconst char *pswd, *ushell; 105 106 107 #ifdef SHADOW_SUPPORT 108 struct spwd *sp; 109 int shadowfile; 110 #endif 111 112 #ifdef SHADOW_SUPPORT 113 /* 114 **-------------------------------------------------------------- 115 ** Check the existence of SHADOW. If it is there, then we are 116 ** running a two-password-file system. 117 **-------------------------------------------------------------- 118 */ 119 if (access(SHADOW, 0)) 120 shadowfile = 0; /* SHADOW is not there */ 121 else 122 shadowfile = 1; 123 124 setpwent(); 125 if (shadowfile) 126 (void) setspent(); /* Setting the shadow password file */ 127 if ((p = getpwnam(usrnam)) == NULL || 128 (shadowfile && (sp = getspnam(usrnam)) == NULL)) 129 return (NULL); 130 131 if (shadowfile) { 132 pswd = sp->sp_pwdp; 133 (void) endspent(); 134 } else 135 pswd = p->pw_passwd; 136 137 #else 138 p = getpwnam(usrnam); 139 if (p == NULL) 140 return (NULL); 141 pswd = p->pw_passwd; 142 #endif 143 144 #ifdef ISC_2_0 145 /* *----------------------------------------------------------- * We 146 * may have an 'x' in which case look in /etc/shadow .. 147 * *----------------------------------------------------------- */ 148 if (((strlen(pswd)) == 1) && pswd[0] == 'x') { 149 struct spwd *shadow = getspnam(usrnam); 150 151 if (!shadow) 152 return (NULL); 153 pswd = shadow->sp_pwdp; 154 } 155 #endif 156 localp = *p; 157 localp.pw_passwd = pswd; 158 #ifdef USE_GETUSERSHELL 159 160 setusershell(); 161 while (ushell = getusershell()) { 162 if (!strcmp(ushell, localp.pw_shell)) { 163 ok = 1; 164 break; 165 } 166 } 167 endusershell(); 168 if (!ok) 169 return (NULL); 170 #else 171 /* 172 * the best we can do is to ensure that the shell ends in "sh" 173 */ 174 ushell = localp.pw_shell; 175 if (strlen(ushell) < 2) 176 return (NULL); 177 ushell += strlen(ushell) - 2; 178 if (strcmp(ushell, "sh")) 179 return (NULL); 180 181 #endif 182 return (&localp); 183 } 184 185 186 187 /* 188 **--------------------------------------------------------------------- 189 ** Print support procedures 190 **--------------------------------------------------------------------- 191 */ 192 193 194 char * 195 mapfont(char f, char i, char b) 196 { 197 static char fontname[64]; 198 199 fontname[0] = 0; /* clear it out */ 200 201 switch (f) { 202 case 'c': 203 (void) strlcpy(fontname, "Courier", sizeof(fontname)); 204 break; 205 case 'h': 206 (void) strlcpy(fontname, "Helvetica", sizeof(fontname)); 207 break; 208 case 't': 209 (void) strlcpy(fontname, "Times", sizeof(fontname)); 210 break; 211 default: 212 (void) strlcpy(fontname, "Times-Roman", sizeof(fontname)); 213 goto finis; 214 } 215 if (i != 'o' && b != 'b') { /* no bold or oblique */ 216 if (f == 't') /* special case Times */ 217 (void) strlcat(fontname, "-Roman", sizeof(fontname)); 218 goto finis; 219 } 220 (void) strlcat(fontname, "-", sizeof(fontname)); 221 if (b == 'b') 222 (void) strlcat(fontname, "Bold", sizeof(fontname)); 223 if (i == 'o') /* o-blique */ 224 (void) strlcat(fontname, f == 't' ? "Italic" : "Oblique", 225 sizeof(fontname)); 226 227 finis: return (&fontname[0]); 228 } 229 /* 230 * run_ps630 performs the Diablo 630 emulation filtering process. ps630 231 * was broken in certain Sun releases: it would not accept point size or 232 * font changes. If your version is fixed, undefine the symbol 233 * PS630_IS_BROKEN and rebuild pc-nfsd. 234 */ 235 /* #define PS630_IS_BROKEN 1 */ 236 237 void 238 run_ps630(f, opts) 239 char *f; 240 char *opts; 241 { 242 char temp_file[256]; 243 char commbuf[256]; 244 int i; 245 246 (void) strlcpy(temp_file, f, sizeof(temp_file)); 247 (void) strlcat(temp_file, "X", sizeof(temp_file)); /* intermediate file name */ 248 249 #ifndef PS630_IS_BROKEN 250 (void) snprintf(commbuf, sizeof(commbuf), "ps630 -s %c%c -p %s -f ", 251 opts[2], opts[3], temp_file); 252 (void) strlcat(commbuf, mapfont(opts[4], opts[5], opts[6]), 253 sizeof(commbuf)); 254 (void) strlcat(commbuf, " -F ", sizeof(commbuf)); 255 (void) strlcat(commbuf, mapfont(opts[7], opts[8], opts[9]), 256 sizeof(commbuf)); 257 (void) strlcat(commbuf, " ", sizeof(commbuf)); 258 (void) strlcat(commbuf, f, sizeof(commbuf)); 259 #else /* PS630_IS_BROKEN */ 260 /* 261 * The pitch and font features of ps630 appear to be broken at 262 * this time. 263 */ 264 (void) snprintf(commbuf, sizeof(commbuf), "ps630 -p %s %s", 265 temp_file, f); 266 #endif /* PS630_IS_BROKEN */ 267 268 269 if ((i = system(commbuf)) != 0) { 270 /* 271 * Under (un)certain conditions, ps630 may return -1 even 272 * if it worked. Hence the commenting out of this error 273 * report. 274 */ 275 /* (void)fprintf(stderr, "\n\nrun_ps630 rc = %d\n", i) */ ; 276 /* exit(1); */ 277 } 278 if (rename(temp_file, f)) { 279 perror("run_ps630: rename"); 280 exit(1); 281 } 282 return; 283 } 284 285 286 287 288 289 /* 290 **--------------------------------------------------------------------- 291 ** WTMP update support 292 **--------------------------------------------------------------------- 293 */ 294 295 296 #ifdef WTMP 297 void 298 wlogin(name, req) 299 char *name; 300 struct svc_req *req; 301 { 302 struct sockaddr_in *who; 303 struct hostent *hp; 304 char *host; 305 306 if (!wtmp_enabled) 307 return; 308 309 /* Get network address of client. */ 310 who = &req->rq_xprt->xp_raddr; 311 312 /* Get name of connected client */ 313 hp = gethostbyaddr((char *) &who->sin_addr, 314 sizeof(struct in_addr), 315 who->sin_family); 316 317 if (hp) { 318 host = hp->h_name; 319 } else { 320 host = inet_ntoa(who->sin_addr); 321 } 322 323 #ifdef SUPPORT_UTMP 324 logwtmp("PC-NFS", name, host); 325 #endif 326 #ifdef SUPPORT_UTMPX 327 logwtmpx("PC-NFS", name, host, 0, USER_PROCESS); 328 #endif 329 } 330 #endif /* WTMP */ 331 332 333 /* 334 **--------------------------------------------------------------------- 335 ** Run-process-as-user procedures 336 **--------------------------------------------------------------------- 337 */ 338 339 340 #define READER_FD 0 341 #define WRITER_FD 1 342 343 static int child_pid; 344 345 static char cached_user[64] = ""; 346 static uid_t cached_uid; 347 static gid_t cached_gid; 348 349 static struct sigaction old_action; 350 static struct sigaction new_action; 351 static struct itimerval timer; 352 353 int interrupted = 0; 354 static FILE *pipe_handle; 355 356 void 357 myhandler(dummy) 358 int dummy; 359 { 360 interrupted = 1; 361 fclose(pipe_handle); 362 kill(child_pid, SIGKILL); 363 msg_out("rpc.pcnfsd: su_popen timeout - killed child process"); 364 } 365 366 void 367 start_watchdog(n) 368 int n; 369 { 370 /* 371 * Setup SIGALRM handler, force interrupt of ongoing syscall 372 */ 373 374 new_action.sa_handler = myhandler; 375 sigemptyset(&(new_action.sa_mask)); 376 new_action.sa_flags = 0; 377 #ifdef SA_INTERRUPT 378 new_action.sa_flags |= SA_INTERRUPT; 379 #endif 380 sigaction(SIGALRM, &new_action, &old_action); 381 382 /* 383 * Set interval timer for n seconds 384 */ 385 timer.it_interval.tv_sec = 0; 386 timer.it_interval.tv_usec = 0; 387 timer.it_value.tv_sec = n; 388 timer.it_value.tv_usec = 0; 389 setitimer(ITIMER_REAL, &timer, NULL); 390 interrupted = 0; 391 392 } 393 394 void 395 stop_watchdog() 396 { 397 /* 398 * Cancel timer 399 */ 400 401 timer.it_interval.tv_sec = 0; 402 timer.it_interval.tv_usec = 0; 403 timer.it_value.tv_sec = 0; 404 timer.it_value.tv_usec = 0; 405 setitimer(ITIMER_REAL, &timer, NULL); 406 407 /* 408 * restore old signal handling 409 */ 410 sigaction(SIGALRM, &old_action, NULL); 411 } 412 413 FILE * 414 su_popen(user, cmd, maxtime) 415 char *user; 416 char *cmd; 417 int maxtime; 418 { 419 int p[2]; 420 int parent_fd, child_fd, pid; 421 struct passwd *pw; 422 423 if (strcmp(cached_user, user)) { 424 pw = getpwnam(user); 425 if (!pw) 426 pw = getpwnam("nobody"); 427 if (pw) { 428 cached_uid = pw->pw_uid; 429 cached_gid = pw->pw_gid; 430 strlcpy(cached_user, user, sizeof(cached_user)); 431 } else { 432 cached_uid = (uid_t) (-2); 433 cached_gid = (gid_t) (-2); 434 cached_user[0] = '\0'; 435 } 436 } 437 if (pipe(p) < 0) { 438 msg_out("rpc.pcnfsd: unable to create pipe in su_popen"); 439 return (NULL); 440 } 441 parent_fd = p[READER_FD]; 442 child_fd = p[WRITER_FD]; 443 if ((pid = fork()) == 0) { 444 int i; 445 446 for (i = 0; i < 10; i++) 447 if (i != child_fd) 448 (void) close(i); 449 if (child_fd != 1) { 450 (void) dup2(child_fd, 1); 451 (void) close(child_fd); 452 } 453 dup2(1, 2); /* let's get stderr as well */ 454 455 (void) setgid(cached_gid); 456 (void) setuid(cached_uid); 457 458 (void) execl("/bin/sh", "sh", "-c", cmd, (char *) NULL); 459 _exit(255); 460 } 461 if (pid == -1) { 462 msg_out("rpc.pcnfsd: fork failed"); 463 close(parent_fd); 464 close(child_fd); 465 return (NULL); 466 } 467 child_pid = pid; 468 close(child_fd); 469 start_watchdog(maxtime); 470 pipe_handle = fdopen(parent_fd, "r"); 471 return (pipe_handle); 472 } 473 474 int 475 su_pclose(ptr) 476 FILE *ptr; 477 { 478 int pid, status; 479 480 stop_watchdog(); 481 482 fclose(ptr); 483 if (child_pid == -1) 484 return (-1); 485 while ((pid = wait(&status)) != child_pid && pid != -1); 486 return (pid == -1 ? -1 : status); 487 } 488 489 490 491 /* 492 ** The following routine reads a file "/etc/pcnfsd.conf" if present, 493 ** and uses it to replace certain builtin elements, like the 494 ** name of the print spool directory. The configuration file 495 ** Is the usual kind: Comments begin with '#', blank lines are ignored, 496 ** and valid lines are of the form 497 ** 498 ** <keyword><whitespace><value> 499 ** 500 ** The following keywords are recognized: 501 ** 502 ** spooldir 503 ** printer name alias-for command 504 ** wtmp yes|no 505 */ 506 static void 507 config_from_file(void) 508 { 509 FILE *fd; 510 char buff[1024]; 511 char *cp; 512 char *kw; 513 char *val; 514 char *arg1; 515 char *arg2; 516 517 if ((fd = fopen("/etc/pcnfsd.conf", "r")) == NULL) 518 return; 519 while (fgets(buff, 1024, fd)) { 520 cp = strchr(buff, '\n'); 521 *cp = '\0'; 522 cp = strchr(buff, '#'); 523 if (cp) 524 *cp = '\0'; 525 kw = strtok(buff, " \t"); 526 if (kw == NULL) 527 continue; 528 val = strtok(NULL, " \t"); 529 if (val == NULL) 530 continue; 531 if (!strcasecmp(kw, "spooldir")) { 532 strlcpy(sp_name, val, sizeof(sp_name)); 533 continue; 534 } 535 #ifdef WTMP 536 if (!strcasecmp(kw, "wtmp")) { 537 /* assume default is YES, just look for negatives */ 538 if (!strcasecmp(val, "no") || 539 !strcasecmp(val, "off") || 540 !strcasecmp(val, "disable") || 541 !strcmp(val, "0")) 542 wtmp_enabled = 0; 543 continue; 544 } 545 #endif 546 if (!strcasecmp(kw, "printer")) { 547 arg1 = strtok(NULL, " \t"); 548 arg2 = strtok(NULL, ""); 549 (void) add_printer_alias(val, arg1, arg2); 550 continue; 551 } 552 /* 553 ** Add new cases here 554 */ 555 } 556 fclose(fd); 557 } 558 559 /* 560 ** hack for main() - call config_from_file() then the real main 561 ** in the rpcgen output, which is hacked by CPPFLAGS to be "mymain" 562 */ 563 #undef main 564 565 int mymain(int argc, char *argv[]); 566 567 int 568 main(int argc, char *argv[]) 569 { 570 config_from_file(); 571 return mymain(argc, argv); 572 } 573 574 /* 575 ** strembedded - returns true if s1 is embedded (in any case) in s2 576 */ 577 578 int 579 strembedded(s1, s2) 580 const char *s1; 581 const char *s2; 582 { 583 while (*s2) { 584 if (!strcasecmp(s1, s2)) 585 return 1; 586 s2++; 587 } 588 return 0; 589 } 590
Indexes created Tue Sep 23 07:09:52 GMT 2025