1 /* $NetBSD: common.c,v 1.29 2006/01/04 15:32:50 garbled Exp $ */ 2 3 /* 4 * Copyright (c) 1983, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #include <sys/cdefs.h> 38 #ifndef lint 39 #if 0 40 static char sccsid[] = "@(#)common.c 8.5 (Berkeley) 4/28/95"; 41 #else 42 __RCSID("$NetBSD: common.c,v 1.29 2006/01/04 15:32:50 garbled 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 <unistd.h> 58 #include <stdlib.h> 59 #include <stdio.h> 60 #include <string.h> 61 #include <ifaddrs.h> 62 #include "lp.h" 63 #include "lp.local.h" 64 #include "pathnames.h" 65 66 /* 67 * Routines and data common to all the line printer functions. 68 */ 69 70 const char *AF; /* accounting file */ 71 long BR; /* baud rate if lp is a tty */ 72 const char *CF; /* name of cifplot filter (per job) */ 73 const char *DF; /* name of tex filter (per job) */ 74 long DU; /* daeomon user-id */ 75 long FC; /* flags to clear if lp is a tty */ 76 const char *FF; /* form feed string */ 77 long FS; /* flags to set if lp is a tty */ 78 const char *GF; /* name of graph(1G) filter (per job) */ 79 long HL; /* print header last */ 80 const char *IF; /* name of input filter (created per job) */ 81 const char *LF; /* log file for error messages */ 82 const char *LO; /* lock file name */ 83 const char *LP; /* line printer device name */ 84 long MC; /* maximum number of copies allowed */ 85 const char *MS; /* stty flags to set if lp is a tty */ 86 long MX; /* maximum number of blocks to copy */ 87 const char *NF; /* name of ditroff filter (per job) */ 88 const char *OF; /* name of output filter (created once) */ 89 const char *PF; /* name of vrast filter (per job) */ 90 long PL; /* page length */ 91 long PW; /* page width */ 92 long PX; /* page width in pixels */ 93 long PY; /* page length in pixels */ 94 const char *RF; /* name of fortran text filter (per job) */ 95 const char *RG; /* resricted group */ 96 const char *RM; /* remote machine name */ 97 const char *RP; /* remote printer name */ 98 long RS; /* restricted to those with local accounts */ 99 long RW; /* open LP for reading and writing */ 100 long SB; /* short banner instead of normal header */ 101 long SC; /* suppress multiple copies */ 102 const char *SD; /* spool directory */ 103 long SF; /* suppress FF on each print job */ 104 long SH; /* suppress header page */ 105 const char *ST; /* status file name */ 106 const char *TF; /* name of troff filter (per job) */ 107 const char *TR; /* trailer string to be output when Q empties */ 108 const char *VF; /* name of vplot filter (per job) */ 109 long XC; /* flags to clear for local mode */ 110 long XS; /* flags to set for local mode */ 111 112 char line[BUFSIZ]; 113 int remote; /* true if sending files to a remote host */ 114 115 extern uid_t uid, euid; 116 117 static int compar(const void *, const void *); 118 119 /* 120 * Create a TCP connection to host "rhost" at port "rport". 121 * If rport == 0, then use the printer service port. 122 * Most of this code comes from rcmd.c. 123 */ 124 int 125 getport(const char *rhost, int rport) 126 { 127 struct addrinfo hints, *res, *r; 128 u_int timo = 1; 129 int s, lport = IPPORT_RESERVED - 1; 130 int error; 131 int refuse, trial; 132 char pbuf[NI_MAXSERV]; 133 134 /* 135 * Get the host address and port number to connect to. 136 */ 137 if (rhost == NULL) 138 fatal("no remote host to connect to"); 139 memset(&hints, 0, sizeof(hints)); 140 hints.ai_family = PF_UNSPEC; 141 hints.ai_socktype = SOCK_STREAM; 142 if (rport) 143 snprintf(pbuf, sizeof(pbuf), "%d", rport); 144 else 145 snprintf(pbuf, sizeof(pbuf), "printer"); 146 error = getaddrinfo(rhost, pbuf, &hints, &res); 147 if (error) 148 fatal("printer/tcp: %s", gai_strerror(error)); 149 150 /* 151 * Try connecting to the server. 152 */ 153 retry: 154 s = -1; 155 refuse = trial = 0; 156 for (r = res; r; r = r->ai_next) { 157 trial++; 158 retryport: 159 seteuid(euid); 160 s = rresvport_af(&lport, r->ai_family); 161 seteuid(uid); 162 if (s < 0) 163 return(-1); 164 if (connect(s, r->ai_addr, r->ai_addrlen) < 0) { 165 error = errno; 166 (void)close(s); 167 s = -1; 168 errno = error; 169 if (errno == EADDRINUSE) { 170 lport--; 171 goto retryport; 172 } else if (errno == ECONNREFUSED) 173 refuse++; 174 continue; 175 } else 176 break; 177 } 178 if (s < 0 && trial == refuse && timo <= 16) { 179 sleep(timo); 180 timo *= 2; 181 goto retry; 182 } 183 if (res) 184 freeaddrinfo(res); 185 return(s); 186 } 187 188 /* 189 * Getline reads a line from the control file cfp, removes tabs, converts 190 * new-line to null and leaves it in line. 191 * Returns 0 at EOF or the number of characters read. 192 */ 193 int 194 getline(FILE *cfp) 195 { 196 int linel = 0, c; 197 char *lp = line; 198 199 while ((c = getc(cfp)) != '\n' && linel+1<sizeof(line)) { 200 if (c == EOF) 201 return(0); 202 if (c == '\t') { 203 do { 204 *lp++ = ' '; 205 linel++; 206 } while ((linel & 07) != 0 && linel+1 < sizeof(line)); 207 continue; 208 } 209 *lp++ = c; 210 linel++; 211 } 212 *lp++ = '\0'; 213 return(linel); 214 } 215 216 /* 217 * Scan the current directory and make a list of daemon files sorted by 218 * creation time. 219 * Return the number of entries and a pointer to the list. 220 */ 221 int 222 getq(struct queue **namelist[]) 223 { 224 struct dirent *d; 225 struct queue *q, **queue, **nqueue; 226 struct stat stbuf; 227 DIR *dirp; 228 u_int nitems, arraysz; 229 230 seteuid(euid); 231 dirp = opendir(SD); 232 seteuid(uid); 233 if (dirp == NULL) 234 return(-1); 235 if (fstat(dirp->dd_fd, &stbuf) < 0) 236 goto errdone; 237 238 /* 239 * Estimate the array size by taking the size of the directory file 240 * and dividing it by a multiple of the minimum size entry. 241 */ 242 arraysz = (int)(stbuf.st_size / 24); 243 queue = (struct queue **)malloc(arraysz * sizeof(struct queue *)); 244 if (queue == NULL) 245 goto errdone; 246 247 nitems = 0; 248 while ((d = readdir(dirp)) != NULL) { 249 if (d->d_name[0] != 'c' || d->d_name[1] != 'f') 250 continue; /* daemon control files only */ 251 seteuid(euid); 252 if (stat(d->d_name, &stbuf) < 0) { 253 seteuid(uid); 254 continue; /* Doesn't exist */ 255 } 256 seteuid(uid); 257 q = (struct queue *)malloc(sizeof(time_t)+strlen(d->d_name)+1); 258 if (q == NULL) 259 goto errdone; 260 q->q_time = stbuf.st_mtime; 261 strcpy(q->q_name, d->d_name); /* XXX: strcpy is safe */ 262 /* 263 * Check to make sure the array has space left and 264 * realloc the maximum size. 265 */ 266 if (++nitems > arraysz) { 267 nqueue = (struct queue **)realloc(queue, 268 arraysz * 2 * sizeof(struct queue *)); 269 if (nqueue == NULL) 270 goto errdone; 271 queue = nqueue; 272 arraysz *= 2; 273 } 274 queue[nitems-1] = q; 275 } 276 closedir(dirp); 277 if (nitems) 278 qsort(queue, nitems, sizeof(struct queue *), compar); 279 *namelist = queue; 280 return(nitems); 281 282 errdone: 283 closedir(dirp); 284 return(-1); 285 } 286 287 /* 288 * Compare modification times. 289 */ 290 static int 291 compar(const void *p1, const void *p2) 292 { 293 const struct queue *const *q1 = p1; 294 const struct queue *const *q2 = p2; 295 296 if ((*q1)->q_time < (*q2)->q_time) 297 return -1; 298 if ((*q1)->q_time > (*q2)->q_time) 299 return 1; 300 return 0; 301 } 302 303 /* 304 * Figure out whether the local machine is the same 305 * as the remote machine (RM) entry (if it exists). 306 */ 307 const char * 308 checkremote(void) 309 { 310 char lname[NI_MAXHOST], rname[NI_MAXHOST]; 311 const char *rmhost; 312 struct addrinfo hints, *res, *res0; 313 static char errbuf[128]; 314 int error; 315 struct ifaddrs *ifap, *ifa; 316 const int niflags = NI_NUMERICHOST; 317 #ifdef __KAME__ 318 struct sockaddr_in6 sin6; 319 struct sockaddr_in6 *sin6p; 320 #endif 321 322 remote = 0; /* assume printer is local on failure */ 323 324 if (RM == NULL) 325 return NULL; 326 327 /* get the local interface addresses */ 328 if (getifaddrs(&ifap) < 0) { 329 (void)snprintf(errbuf, sizeof(errbuf), 330 "unable to get local interface address: %s", 331 strerror(errno)); 332 return errbuf; 333 } 334 335 /* get the remote host addresses (RM) */ 336 memset(&hints, 0, sizeof(hints)); 337 hints.ai_flags = AI_CANONNAME; 338 hints.ai_family = PF_UNSPEC; 339 hints.ai_socktype = SOCK_STREAM; 340 res = NULL; 341 if ((rmhost = strchr(RM, '@'))) 342 rmhost++; 343 else 344 rmhost = RM; 345 error = getaddrinfo(rmhost, NULL, &hints, &res0); 346 if (error) { 347 (void)snprintf(errbuf, sizeof(errbuf), 348 "unable to resolve remote machine %s: %s", 349 RM, gai_strerror(error)); 350 freeifaddrs(ifap); 351 return errbuf; 352 } 353 354 remote = 1; /* assume printer is remote */ 355 356 for (res = res0; res; res = res->ai_next) { 357 if (getnameinfo(res->ai_addr, res->ai_addrlen, 358 rname, sizeof(rname), NULL, 0, niflags) != 0) 359 continue; 360 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 361 #ifdef __KAME__ 362 sin6p = (struct sockaddr_in6 *)ifa->ifa_addr; 363 if (ifa->ifa_addr->sa_family == AF_INET6 && 364 ifa->ifa_addr->sa_len == sizeof(sin6) && 365 IN6_IS_ADDR_LINKLOCAL(&sin6p->sin6_addr) && 366 *(u_int16_t *)&sin6p->sin6_addr.s6_addr[2]) { 367 /* kame scopeid hack */ 368 memcpy(&sin6, ifa->ifa_addr, sizeof(sin6)); 369 sin6.sin6_scope_id = 370 ntohs(*(u_int16_t *)&sin6p->sin6_addr.s6_addr[2]); 371 sin6.sin6_addr.s6_addr[2] = 0; 372 sin6.sin6_addr.s6_addr[3] = 0; 373 if (getnameinfo((struct sockaddr *)&sin6, 374 sin6.sin6_len, lname, sizeof(lname), 375 NULL, 0, niflags) != 0) 376 continue; 377 } else 378 #endif 379 if (getnameinfo(ifa->ifa_addr, ifa->ifa_addr->sa_len, 380 lname, sizeof(lname), NULL, 0, niflags) != 0) 381 continue; 382 383 if (strcmp(rname, lname) == 0) { 384 remote = 0; 385 goto done; 386 } 387 } 388 } 389 done: 390 freeaddrinfo(res0); 391 freeifaddrs(ifap); 392 return NULL; 393 } 394 395 /* sleep n milliseconds */ 396 void 397 delay(int n) 398 { 399 struct timespec tdelay; 400 401 if (n <= 0 || n > 10000) 402 fatal("unreasonable delay period (%d)", n); 403 tdelay.tv_sec = n / 1000; 404 tdelay.tv_nsec = (n % 1000) * 1000000; 405 nanosleep(&tdelay, NULL); 406 } 407 408 void 409 getprintcap(const char *pr) 410 { 411 char *cp; 412 const char *dp; 413 int i; 414 415 if ((i = cgetent(&bp, printcapdb, pr)) == -2) 416 fatal("can't open printer description file"); 417 else if (i == -1) 418 fatal("unknown printer: %s", pr); 419 else if (i == -3) 420 fatal("potential reference loop detected in printcap file"); 421 422 LP = cgetstr(bp, DEFLP, &cp) == -1 ? _PATH_DEFDEVLP : cp; 423 RP = cgetstr(bp, "rp", &cp) == -1 ? DEFLP : cp; 424 SD = cgetstr(bp, "sd", &cp) == -1 ? _PATH_DEFSPOOL : cp; 425 LO = cgetstr(bp, "lo", &cp) == -1 ? DEFLOCK : cp; 426 ST = cgetstr(bp, "st", &cp) == -1 ? DEFSTAT : cp; 427 RM = cgetstr(bp, "rm", &cp) == -1 ? NULL : cp; 428 if ((dp = checkremote()) != NULL) 429 printf("Warning: %s\n", dp); 430 LF = cgetstr(bp, "lf", &cp) == -1 ? _PATH_CONSOLE : cp; 431 } 432 433 /* 434 * Make sure there's some work to do before forking off a child 435 */ 436 int 437 ckqueue(char *cap) 438 { 439 struct dirent *d; 440 DIR *dirp; 441 const char *spooldir; 442 char *sd; 443 int rv = 0; 444 445 spooldir = cgetstr(cap, "sd", &sd) == -1 ? _PATH_DEFSPOOL : sd; 446 if ((dirp = opendir(spooldir)) == NULL) { 447 rv = -1; 448 goto out; 449 } 450 while ((d = readdir(dirp)) != NULL) { 451 if (d->d_name[0] != 'c' || d->d_name[1] != 'f') 452 continue; /* daemon control files only */ 453 rv = 1; 454 break; 455 } 456 out: 457 if (dirp != NULL) 458 closedir(dirp); 459 if (spooldir != sd) 460 free(sd); 461 return (0); 462 } 463