1 /* $OpenBSD: common.c,v 1.16 2002/02/19 19:39:40 millert 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. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 */ 40 41 #ifndef lint 42 #if 0 43 static const char sccsid[] = "@(#)common.c 8.5 (Berkeley) 4/28/95"; 44 #else 45 static const char rcsid[] = "$OpenBSD: common.c,v 1.16 2002/02/19 19:39:40 millert Exp $"; 46 #endif 47 #endif /* not lint */ 48 49 #include <sys/param.h> 50 #include <sys/stat.h> 51 #include <sys/time.h> 52 53 #include <sys/socket.h> 54 #include <netinet/in.h> 55 #include <arpa/inet.h> 56 #include <netdb.h> 57 58 #include <dirent.h> 59 #include <errno.h> 60 #include <unistd.h> 61 #include <stdlib.h> 62 #include <stdio.h> 63 #include <string.h> 64 #include <stdarg.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; /* daeomon 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 char *PF; /* name of vrast filter (per job) */ 92 long PL; /* page length */ 93 long PW; /* page width */ 94 long PX; /* page width in pixels */ 95 long PY; /* page length in pixels */ 96 char *RF; /* name of fortran text filter (per job) */ 97 char *RG; /* resricted group */ 98 char *RM; /* remote machine name */ 99 char *RP; /* remote printer name */ 100 long RS; /* restricted to those with local accounts */ 101 long RW; /* open LP for reading and writing */ 102 long SB; /* short banner instead of normal header */ 103 long SC; /* suppress multiple copies */ 104 char *SD; /* spool directory */ 105 long SF; /* suppress FF on each print job */ 106 long SH; /* suppress header page */ 107 char *ST; /* status file name */ 108 char *TF; /* name of troff filter (per job) */ 109 char *TR; /* trailer string to be output when Q empties */ 110 char *VF; /* name of vplot filter (per job) */ 111 long XC; /* flags to clear for local mode */ 112 long XS; /* flags to set for local mode */ 113 114 char line[BUFSIZ]; 115 char *bp; /* pointer into printcap buffer. */ 116 char *printer; /* printer name */ 117 /* host machine name */ 118 char host[MAXHOSTNAMELEN]; 119 char *from = host; /* client's machine name */ 120 int remote; /* true if sending files to a remote host */ 121 char *printcapdb[2] = { _PATH_PRINTCAP, 0 }; 122 123 extern uid_t uid, euid; 124 125 static int compar(const void *, const void *); 126 127 /* 128 * Create a TCP connection to host "rhost" at port "rport". 129 * If rport == 0, then use the printer service port. 130 * Most of this code comes from rcmd.c. 131 */ 132 int 133 getport(rhost, rport) 134 char *rhost; 135 int rport; 136 { 137 struct hostent *hp; 138 struct servent *sp; 139 struct sockaddr_in sin; 140 int s, timo = 1, on = 1, lport = IPPORT_RESERVED - 1; 141 int err; 142 143 /* 144 * Get the host address and port number to connect to. 145 */ 146 if (rhost == NULL) 147 fatal("no remote host to connect to"); 148 bzero((char *)&sin, sizeof(sin)); 149 if (inet_aton(rhost, &sin.sin_addr) == 1) 150 sin.sin_family = AF_INET; 151 else { 152 siginterrupt(SIGINT, 1); 153 hp = gethostbyname(rhost); 154 if (hp == NULL) { 155 if (errno == EINTR && gotintr) { 156 siginterrupt(SIGINT, 0); 157 return (-1); 158 } 159 siginterrupt(SIGINT, 0); 160 fatal("unknown host %s", rhost); 161 } 162 siginterrupt(SIGINT, 0); 163 bcopy(hp->h_addr, (caddr_t)&sin.sin_addr, hp->h_length); 164 sin.sin_family = hp->h_addrtype; 165 } 166 if (rport == 0) { 167 sp = getservbyname("printer", "tcp"); 168 if (sp == NULL) 169 fatal("printer/tcp: unknown service"); 170 sin.sin_port = sp->s_port; 171 } else 172 sin.sin_port = htons(rport); 173 174 /* 175 * Try connecting to the server. 176 */ 177 retry: 178 seteuid(euid); 179 siginterrupt(SIGINT, 1); 180 s = rresvport(&lport); 181 siginterrupt(SIGINT, 0); 182 seteuid(uid); 183 if (s < 0) 184 return(-1); 185 siginterrupt(SIGINT, 1); 186 if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) { 187 err = errno; 188 (void) close(s); 189 siginterrupt(SIGINT, 0); 190 errno = err; 191 if (errno == EINTR && gotintr) { 192 close(s); 193 return (-1); 194 } 195 if (errno == EADDRINUSE) { 196 lport--; 197 goto retry; 198 } 199 if (errno == ECONNREFUSED && timo <= 16) { 200 sleep(timo); 201 timo *= 2; 202 goto retry; 203 } 204 return(-1); 205 } 206 siginterrupt(SIGINT, 0); 207 208 /* Don't bother if we get an error here. */ 209 setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, (char *)&on, sizeof on); 210 return(s); 211 } 212 213 /* 214 * Getline reads a line from the control file cfp, removes tabs, converts 215 * new-line to null and leaves it in line. 216 * Returns 0 at EOF or the number of characters read. 217 */ 218 int 219 getline(cfp) 220 FILE *cfp; 221 { 222 int linel = 0; 223 char *lp = line; 224 int c; 225 226 while ((c = getc(cfp)) != '\n' && linel+1<sizeof(line)) { 227 if (c == EOF) 228 return(0); 229 if (c == '\t') { 230 do { 231 *lp++ = ' '; 232 linel++; 233 } while ((linel & 07) != 0 && linel+1<sizeof(line)); 234 continue; 235 } 236 *lp++ = c; 237 linel++; 238 } 239 *lp++ = '\0'; 240 return(linel); 241 } 242 243 /* 244 * Scan the current directory and make a list of daemon files sorted by 245 * creation time. 246 * Return the number of entries and a pointer to the list. 247 */ 248 int 249 getq(namelist) 250 struct queue *(*namelist[]); 251 { 252 struct dirent *d; 253 struct queue *q, **queue; 254 int nitems; 255 struct stat stbuf; 256 DIR *dirp; 257 int arraysz; 258 259 260 seteuid(euid); 261 dirp = opendir(SD); 262 seteuid(uid); 263 if (dirp== NULL) 264 return(-1); 265 if (fstat(dirp->dd_fd, &stbuf) < 0) 266 goto errdone; 267 268 /* 269 * Estimate the array size by taking the size of the directory file 270 * and dividing it by a multiple of the minimum size entry. 271 */ 272 arraysz = (stbuf.st_size / 24); 273 queue = (struct queue **)malloc(arraysz * sizeof(struct queue *)); 274 if (queue == NULL) 275 goto errdone; 276 277 nitems = 0; 278 while ((d = readdir(dirp)) != NULL) { 279 if (d->d_name[0] != 'c' || d->d_name[1] != 'f') 280 continue; /* daemon control files only */ 281 seteuid(euid); 282 if (stat(d->d_name, &stbuf) < 0) { 283 seteuid(uid); 284 continue; /* Doesn't exist */ 285 } 286 seteuid(uid); 287 q = (struct queue *)malloc(sizeof(time_t)+strlen(d->d_name)+1); 288 if (q == NULL) 289 goto errdone; 290 q->q_time = stbuf.st_mtime; 291 strcpy(q->q_name, d->d_name); 292 /* 293 * Check to make sure the array has space left and 294 * realloc the maximum size. 295 */ 296 if (++nitems > arraysz) { 297 arraysz *= 2; 298 queue = (struct queue **)realloc((char *)queue, 299 arraysz * sizeof(struct queue *)); 300 if (queue == NULL) 301 goto errdone; 302 } 303 queue[nitems-1] = q; 304 } 305 closedir(dirp); 306 if (nitems) 307 qsort(queue, nitems, sizeof(struct queue *), compar); 308 *namelist = queue; 309 return(nitems); 310 311 errdone: 312 closedir(dirp); 313 return(-1); 314 } 315 316 /* 317 * Compare modification times. 318 */ 319 static int 320 compar(p1, p2) 321 const void *p1, *p2; 322 { 323 if ((*(struct queue **)p1)->q_time < (*(struct queue **)p2)->q_time) 324 return(-1); 325 if ((*(struct queue **)p1)->q_time > (*(struct queue **)p2)->q_time) 326 return(1); 327 return(0); 328 } 329 330 /* 331 * Figure out whether the local machine is the same 332 * as the remote machine (RM) entry (if it exists). 333 */ 334 char * 335 checkremote() 336 { 337 char name[MAXHOSTNAMELEN]; 338 struct hostent *hp; 339 static char errbuf[128]; 340 char *rp, *rp_b; 341 342 remote = 0; /* assume printer is local */ 343 if (RM != NULL) { 344 /* get the official name of the local host */ 345 gethostname(name, sizeof(name)); 346 name[sizeof(name)-1] = '\0'; 347 siginterrupt(SIGINT, 1); 348 hp = gethostbyname(name); 349 if (hp == (struct hostent *) NULL) { 350 if (errno == EINTR && gotintr) { 351 siginterrupt(SIGINT, 0); 352 return NULL; 353 } 354 siginterrupt(SIGINT, 0); 355 (void) snprintf(errbuf, sizeof(errbuf), 356 "unable to get official name for local machine %s", 357 name); 358 return errbuf; 359 } else 360 strlcpy(name, hp->h_name, sizeof name); 361 siginterrupt(SIGINT, 0); 362 363 /* get the official name of RM */ 364 hp = gethostbyname(RM); 365 if (hp == (struct hostent *) NULL) { 366 (void) snprintf(errbuf, sizeof(errbuf), 367 "unable to get official name for remote machine %s", 368 RM); 369 return errbuf; 370 } 371 372 /* 373 * if the two hosts are not the same, 374 * then the printer must be remote. 375 */ 376 if (strcasecmp(name, hp->h_name) != 0) 377 remote = 1; 378 else if (cgetstr(bp, "rp", &rp) > 0) { 379 if (cgetent(&rp_b, printcapdb, rp) == 0) { 380 if (cgetmatch(rp_b, printer) != 0) 381 remote = 1; 382 free(rp_b); 383 } else { 384 (void) snprintf(errbuf, sizeof(errbuf), 385 "can't find (local) remote printer %s", 386 rp); 387 free(rp); 388 return errbuf; 389 } 390 free(rp); 391 } 392 } 393 return NULL; 394 } 395 396 /* sleep n milliseconds */ 397 void 398 delay(n) 399 { 400 struct timeval tdelay; 401 402 if (n <= 0 || n > 10000) 403 fatal("unreasonable delay period (%d)", n); 404 tdelay.tv_sec = n / 1000; 405 tdelay.tv_usec = n * 1000 % 1000000; 406 (void) select(0, (fd_set *)0, (fd_set *)0, (fd_set *)0, &tdelay); 407 } 408 409 void 410 fatal(const char *msg, ...) 411 { 412 extern char *__progname; 413 va_list ap; 414 415 va_start(ap, msg); 416 if (from != host) 417 (void)printf("%s: ", host); 418 (void)printf("%s: ", __progname); 419 if (printer) 420 (void)printf("%s: ", printer); 421 (void)vprintf(msg, ap); 422 va_end(ap); 423 (void)putchar('\n'); 424 exit(1); 425 } 426