1 /* $OpenBSD: common.c,v 1.32 2007/09/02 15:19:38 deraadt Exp $ */ 2 /* $NetBSD: common.c,v 1.21 2000/08/09 14:28:50 itojun Exp $ */ 3 4 /* 5 * Copyright (c) 1983, 1993 6 * The Regents of the University of California. All rights reserved. 7 * (c) UNIX System Laboratories, Inc. 8 * All or some portions of this file are derived from material licensed 9 * to the University of California by American Telephone and Telegraph 10 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 11 * the permission of UNIX System Laboratories, Inc. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 */ 37 38 #ifndef lint 39 #if 0 40 static const char sccsid[] = "@(#)common.c 8.5 (Berkeley) 4/28/95"; 41 #else 42 static const char rcsid[] = "$OpenBSD: common.c,v 1.32 2007/09/02 15:19:38 deraadt Exp $"; 43 #endif 44 #endif /* not lint */ 45 46 #include <sys/param.h> 47 #include <sys/stat.h> 48 #include <sys/time.h> 49 50 #include <sys/socket.h> 51 #include <netinet/in.h> 52 #include <arpa/inet.h> 53 #include <netdb.h> 54 55 #include <dirent.h> 56 #include <errno.h> 57 #include <fcntl.h> 58 #include <unistd.h> 59 #include <stdlib.h> 60 #include <stdio.h> 61 #include <string.h> 62 #include <signal.h> 63 #include <stdarg.h> 64 #include <ifaddrs.h> 65 #include "lp.h" 66 #include "pathnames.h" 67 68 /* 69 * Routines and data common to all the line printer functions. 70 */ 71 72 char *AF; /* accounting file */ 73 long BR; /* baud rate if lp is a tty */ 74 char *CF; /* name of cifplot filter (per job) */ 75 char *DF; /* name of tex filter (per job) */ 76 long DU; /* daemon user-id */ 77 long FC; /* flags to clear if lp is a tty */ 78 char *FF; /* form feed string */ 79 long FS; /* flags to set if lp is a tty */ 80 char *GF; /* name of graph(1G) filter (per job) */ 81 long HL; /* print header last */ 82 char *IF; /* name of input filter (created per job) */ 83 char *LF; /* log file for error messages */ 84 char *LO; /* lock file name */ 85 char *LP; /* line printer device name */ 86 long MC; /* maximum number of copies allowed */ 87 char *MS; /* stty flags to set if lp is a tty */ 88 long MX; /* maximum number of blocks to copy */ 89 char *NF; /* name of ditroff filter (per job) */ 90 char *OF; /* name of output filter (created once) */ 91 long PL; /* page length */ 92 long PW; /* page width */ 93 long PX; /* page width in pixels */ 94 long PY; /* page length in pixels */ 95 char *RF; /* name of fortran text filter (per job) */ 96 char *RG; /* restricted group */ 97 char *RM; /* remote machine name */ 98 char *RP; /* remote printer name */ 99 long RS; /* restricted to those with local accounts */ 100 long RW; /* open LP for reading and writing */ 101 long SB; /* short banner instead of normal header */ 102 long SC; /* suppress multiple copies */ 103 char *SD; /* spool directory */ 104 long SF; /* suppress FF on each print job */ 105 long SH; /* suppress header page */ 106 char *ST; /* status file name */ 107 char *TF; /* name of troff filter (per job) */ 108 char *TR; /* trailer string to be output when Q empties */ 109 char *VF; /* name of vplot filter (per job) */ 110 long XC; /* flags to clear for local mode */ 111 long XS; /* flags to set for local mode */ 112 113 char line[BUFSIZ]; 114 int remote; /* true if sending files to a remote host */ 115 116 static int compar(const void *, const void *); 117 118 /* 119 * Create a TCP connection to host "rhost" at port "rport". 120 * If rport == 0, then use the printer service port. 121 * Most of this code comes from rcmd.c. 122 */ 123 int 124 getport(char *rhost, int rport) 125 { 126 struct addrinfo hints, *res, *r; 127 u_int timo = 1; 128 int s, lport = IPPORT_RESERVED - 1; 129 int error; 130 int refuse, trial; 131 char pbuf[NI_MAXSERV]; 132 133 /* 134 * Get the host address and port number to connect to. 135 */ 136 if (rhost == NULL) 137 fatal("no remote host to connect to"); 138 memset(&hints, 0, sizeof(hints)); 139 hints.ai_family = PF_UNSPEC; 140 hints.ai_socktype = SOCK_STREAM; 141 if (rport) 142 snprintf(pbuf, sizeof(pbuf), "%d", rport); 143 else 144 snprintf(pbuf, sizeof(pbuf), "printer"); 145 siginterrupt(SIGINT, 1); 146 error = getaddrinfo(rhost, pbuf, &hints, &res); 147 siginterrupt(SIGINT, 0); 148 if (error) 149 fatal("printer/tcp: %s", gai_strerror(error)); 150 151 /* 152 * Try connecting to the server. 153 */ 154 retry: 155 s = -1; 156 refuse = trial = 0; 157 for (r = res; r; r = r->ai_next) { 158 trial++; 159 retryport: 160 PRIV_START; 161 s = rresvport_af(&lport, r->ai_family); 162 PRIV_END; 163 if (s < 0) { 164 /* fall back to non-privileged port */ 165 if (errno != EACCES || 166 (s = socket(r->ai_family, SOCK_STREAM, 0)) < 0) { 167 freeaddrinfo(res); 168 return(-1); 169 } 170 } 171 siginterrupt(SIGINT, 1); 172 if (connect(s, r->ai_addr, r->ai_addrlen) < 0) { 173 error = errno; 174 siginterrupt(SIGINT, 0); 175 (void)close(s); 176 s = -1; 177 errno = error; 178 if (errno == EADDRINUSE) { 179 lport--; 180 goto retryport; 181 } else if (errno == ECONNREFUSED) 182 refuse++; 183 continue; 184 } else { 185 siginterrupt(SIGINT, 0); 186 break; 187 } 188 } 189 if (s < 0 && trial == refuse && timo <= 16) { 190 sleep(timo); 191 timo *= 2; 192 goto retry; 193 } 194 if (res) 195 freeaddrinfo(res); 196 197 /* Don't worry if we get an error from setsockopt(). */ 198 trial = 1; 199 setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, &trial, sizeof(trial)); 200 201 return(s); 202 } 203 204 /* 205 * Getline reads a line from the control file cfp, removes tabs, converts 206 * new-line to null and leaves it in line. 207 * Returns 0 at EOF or the number of characters read. 208 */ 209 int 210 getline(FILE *cfp) 211 { 212 int linel = 0; 213 char *lp = line; 214 int c; 215 216 while ((c = getc(cfp)) != '\n' && linel+1<sizeof(line)) { 217 if (c == EOF) 218 return(0); 219 if (c == '\t') { 220 do { 221 *lp++ = ' '; 222 linel++; 223 } while ((linel & 07) != 0 && linel+1 < sizeof(line)); 224 continue; 225 } 226 *lp++ = c; 227 linel++; 228 } 229 *lp++ = '\0'; 230 return(linel); 231 } 232 233 /* 234 * Scan the current directory and make a list of daemon files sorted by 235 * creation time. 236 * Return the number of entries and a pointer to the list. 237 */ 238 int 239 getq(struct queue ***namelist) 240 { 241 struct dirent *d; 242 struct queue *q, **queue = NULL; 243 size_t nitems = 0, arraysz; 244 struct stat stbuf; 245 DIR *dirp; 246 247 PRIV_START; 248 dirp = opendir(SD); 249 PRIV_END; 250 if (dirp == NULL) 251 return(-1); 252 if (fstat(dirfd(dirp), &stbuf) < 0) 253 goto errdone; 254 255 /* 256 * Estimate the array size by taking the size of the directory file 257 * and dividing it by a multiple of the minimum size entry. 258 */ 259 arraysz = (stbuf.st_size / 24); 260 queue = (struct queue **)calloc(arraysz, sizeof(struct queue *)); 261 if (queue == NULL) 262 goto errdone; 263 264 while ((d = readdir(dirp)) != NULL) { 265 if (d->d_name[0] != 'c' || d->d_name[1] != 'f') 266 continue; /* daemon control files only */ 267 PRIV_START; 268 if (stat(d->d_name, &stbuf) < 0) { 269 PRIV_END; 270 continue; /* Doesn't exist */ 271 } 272 PRIV_END; 273 q = (struct queue *)malloc(sizeof(struct queue)); 274 if (q == NULL) 275 goto errdone; 276 q->q_time = stbuf.st_mtime; 277 strlcpy(q->q_name, d->d_name, sizeof(q->q_name)); 278 279 /* 280 * Check to make sure the array has space left and 281 * realloc the maximum size. 282 */ 283 if (nitems == arraysz) { 284 struct queue **newqueue; 285 size_t newarraysz = arraysz * 2; 286 newqueue = (struct queue **)realloc(queue, 287 newarraysz * sizeof(struct queue *)); 288 if (newqueue == NULL) { 289 free(q); 290 goto errdone; 291 } 292 queue = newqueue; 293 arraysz = newarraysz; 294 } 295 queue[nitems++] = q; 296 } 297 closedir(dirp); 298 if (nitems) 299 qsort(queue, nitems, sizeof(struct queue *), compar); 300 *namelist = queue; 301 return(nitems); 302 303 errdone: 304 if (queue != NULL) { 305 while (nitems--) 306 free(queue[nitems]); 307 free(queue); 308 } 309 closedir(dirp); 310 return(-1); 311 } 312 313 /* 314 * Compare modification times. 315 */ 316 static int 317 compar(const void *v1, const void *v2) 318 { 319 struct queue *p1 = *(struct queue **)v1; 320 struct queue *p2 = *(struct queue **)v2; 321 322 return(p1->q_time - p2->q_time); 323 } 324 325 /* 326 * Figure out whether the local machine is the same 327 * as the remote machine (RM) entry (if it exists). 328 */ 329 char * 330 checkremote(void) 331 { 332 char lname[NI_MAXHOST], rname[NI_MAXHOST]; 333 struct addrinfo hints, *res, *res0; 334 static char errbuf[128]; 335 int error; 336 struct ifaddrs *ifap, *ifa; 337 const int niflags = NI_NUMERICHOST; 338 #ifdef __KAME__ 339 struct sockaddr_in6 sin6; 340 struct sockaddr_in6 *sin6p; 341 #endif 342 343 remote = 0; /* assume printer is local on failure */ 344 345 if (RM == NULL || *RM == '\0') 346 return NULL; 347 348 /* get the local interface addresses */ 349 siginterrupt(SIGINT, 1); 350 if (getifaddrs(&ifap) < 0) { 351 (void)snprintf(errbuf, sizeof(errbuf), 352 "unable to get local interface address: %s", 353 strerror(errno)); 354 siginterrupt(SIGINT, 0); 355 return errbuf; 356 } 357 siginterrupt(SIGINT, 0); 358 359 /* get the remote host addresses (RM) */ 360 memset(&hints, 0, sizeof(hints)); 361 hints.ai_flags = AI_CANONNAME; 362 hints.ai_family = PF_UNSPEC; 363 hints.ai_socktype = SOCK_STREAM; 364 res = NULL; 365 siginterrupt(SIGINT, 1); 366 error = getaddrinfo(RM, NULL, &hints, &res0); 367 siginterrupt(SIGINT, 0); 368 if (error) { 369 (void)snprintf(errbuf, sizeof(errbuf), 370 "unable to resolve remote machine %s: %s", 371 RM, gai_strerror(error)); 372 freeifaddrs(ifap); 373 return errbuf; 374 } 375 376 remote = 1; /* assume printer is remote */ 377 378 for (res = res0; res; res = res->ai_next) { 379 siginterrupt(SIGINT, 1); 380 error = getnameinfo(res->ai_addr, res->ai_addrlen, 381 rname, sizeof(rname), NULL, 0, niflags); 382 siginterrupt(SIGINT, 0); 383 if (error != 0) 384 continue; 385 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 386 #ifdef __KAME__ 387 sin6p = (struct sockaddr_in6 *)ifa->ifa_addr; 388 if (ifa->ifa_addr->sa_family == AF_INET6 && 389 ifa->ifa_addr->sa_len == sizeof(sin6) && 390 IN6_IS_ADDR_LINKLOCAL(&sin6p->sin6_addr) && 391 *(u_int16_t *)&sin6p->sin6_addr.s6_addr[2]) { 392 /* kame scopeid hack */ 393 memcpy(&sin6, ifa->ifa_addr, sizeof(sin6)); 394 sin6.sin6_scope_id = 395 ntohs(*(u_int16_t *)&sin6p->sin6_addr.s6_addr[2]); 396 sin6.sin6_addr.s6_addr[2] = 0; 397 sin6.sin6_addr.s6_addr[3] = 0; 398 siginterrupt(SIGINT, 1); 399 error = getnameinfo((struct sockaddr *)&sin6, 400 sin6.sin6_len, lname, sizeof(lname), 401 NULL, 0, niflags); 402 siginterrupt(SIGINT, 0); 403 if (error != 0) 404 continue; 405 } else 406 #endif 407 siginterrupt(SIGINT, 1); 408 error = getnameinfo(ifa->ifa_addr, 409 ifa->ifa_addr->sa_len, lname, sizeof(lname), NULL, 410 0, niflags); 411 siginterrupt(SIGINT, 0); 412 if (error != 0) 413 continue; 414 415 if (strcmp(rname, lname) == 0) { 416 remote = 0; 417 goto done; 418 } 419 } 420 } 421 done: 422 freeaddrinfo(res0); 423 freeifaddrs(ifap); 424 return NULL; 425 } 426 427 /* sleep n milliseconds */ 428 void 429 delay(int n) 430 { 431 struct timeval tdelay; 432 433 if (n <= 0 || n > 10000) 434 fatal("unreasonable delay period (%d)", n); 435 tdelay.tv_sec = n / 1000; 436 tdelay.tv_usec = n * 1000 % 1000000; 437 (void) select(0, (fd_set *)0, (fd_set *)0, (fd_set *)0, &tdelay); 438 } 439 440 __dead void 441 fatal(const char *msg, ...) 442 { 443 extern char *__progname; 444 va_list ap; 445 446 va_start(ap, msg); 447 if (from != host) 448 (void)printf("%s: ", host); 449 (void)printf("%s: ", __progname); 450 if (printer) 451 (void)printf("%s: ", printer); 452 (void)vprintf(msg, ap); 453 va_end(ap); 454 (void)putchar('\n'); 455 exit(1); 456 } 457 458 int 459 safe_open(const char *path, int flags, mode_t mode) 460 { 461 int fd, serrno; 462 struct stat stbuf; 463 464 if ((fd = open(path, flags|O_NONBLOCK, mode)) < 0 || 465 fstat(fd, &stbuf) < 0) { 466 if (fd >= 0) { 467 serrno = errno; 468 close(fd); 469 errno = serrno; 470 } 471 return (-1); 472 } 473 if (!S_ISREG(stbuf.st_mode)) { 474 close(fd); 475 errno = EACCES; 476 return (-1); 477 } 478 if (mode) 479 (void)fchmod(fd, mode); 480 return (fd); 481 } 482