1 /* $OpenBSD: common.c,v 1.11 2001/04/05 16:59:49 deraadt 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 char sccsid[] = "@(#)common.c 8.5 (Berkeley) 4/28/95"; 44 #else 45 static char rcsid[] = "$OpenBSD: common.c,v 1.11 2001/04/05 16:59:49 deraadt 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 "lp.h" 65 #include "pathnames.h" 66 67 /* 68 * Routines and data common to all the line printer functions. 69 */ 70 71 char *AF; /* accounting file */ 72 long BR; /* baud rate if lp is a tty */ 73 char *CF; /* name of cifplot filter (per job) */ 74 char *DF; /* name of tex filter (per job) */ 75 long DU; /* daeomon user-id */ 76 long FC; /* flags to clear if lp is a tty */ 77 char *FF; /* form feed string */ 78 long FS; /* flags to set if lp is a tty */ 79 char *GF; /* name of graph(1G) filter (per job) */ 80 long HL; /* print header last */ 81 char *IF; /* name of input filter (created per job) */ 82 char *LF; /* log file for error messages */ 83 char *LO; /* lock file name */ 84 char *LP; /* line printer device name */ 85 long MC; /* maximum number of copies allowed */ 86 char *MS; /* stty flags to set if lp is a tty */ 87 long MX; /* maximum number of blocks to copy */ 88 char *NF; /* name of ditroff filter (per job) */ 89 char *OF; /* name of output filter (created once) */ 90 char *PF; /* name of vrast filter (per job) */ 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; /* resricted 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 char *bp; /* pointer into printcap buffer. */ 115 char *name; /* program name */ 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 __P((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 hp = gethostbyname(rhost); 153 if (hp == NULL) 154 fatal("unknown host %s", rhost); 155 bcopy(hp->h_addr, (caddr_t)&sin.sin_addr, hp->h_length); 156 sin.sin_family = hp->h_addrtype; 157 } 158 if (rport == 0) { 159 sp = getservbyname("printer", "tcp"); 160 if (sp == NULL) 161 fatal("printer/tcp: unknown service"); 162 sin.sin_port = sp->s_port; 163 } else 164 sin.sin_port = htons(rport); 165 166 /* 167 * Try connecting to the server. 168 */ 169 retry: 170 seteuid(euid); 171 s = rresvport(&lport); 172 seteuid(uid); 173 if (s < 0) 174 return(-1); 175 if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) { 176 err = errno; 177 (void) close(s); 178 errno = err; 179 if (errno == EADDRINUSE) { 180 lport--; 181 goto retry; 182 } 183 if (errno == ECONNREFUSED && timo <= 16) { 184 sleep(timo); 185 timo *= 2; 186 goto retry; 187 } 188 return(-1); 189 } 190 191 /* Don't bother if we get an error here. */ 192 setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, (char *)&on, sizeof on); 193 return(s); 194 } 195 196 /* 197 * Getline reads a line from the control file cfp, removes tabs, converts 198 * new-line to null and leaves it in line. 199 * Returns 0 at EOF or the number of characters read. 200 */ 201 int 202 getline(cfp) 203 FILE *cfp; 204 { 205 register int linel = 0; 206 register char *lp = line; 207 register c; 208 209 while ((c = getc(cfp)) != '\n' && linel+1<sizeof(line)) { 210 if (c == EOF) 211 return(0); 212 if (c == '\t') { 213 do { 214 *lp++ = ' '; 215 linel++; 216 } while ((linel & 07) != 0 && linel+1<sizeof(line)); 217 continue; 218 } 219 *lp++ = c; 220 linel++; 221 } 222 *lp++ = '\0'; 223 return(linel); 224 } 225 226 /* 227 * Scan the current directory and make a list of daemon files sorted by 228 * creation time. 229 * Return the number of entries and a pointer to the list. 230 */ 231 int 232 getq(namelist) 233 struct queue *(*namelist[]); 234 { 235 register struct dirent *d; 236 register struct queue *q, **queue; 237 register int nitems; 238 struct stat stbuf; 239 DIR *dirp; 240 int arraysz; 241 242 243 seteuid(euid); 244 dirp = opendir(SD); 245 seteuid(uid); 246 if (dirp== NULL) 247 return(-1); 248 if (fstat(dirp->dd_fd, &stbuf) < 0) 249 goto errdone; 250 251 /* 252 * Estimate the array size by taking the size of the directory file 253 * and dividing it by a multiple of the minimum size entry. 254 */ 255 arraysz = (stbuf.st_size / 24); 256 queue = (struct queue **)malloc(arraysz * sizeof(struct queue *)); 257 if (queue == NULL) 258 goto errdone; 259 260 nitems = 0; 261 while ((d = readdir(dirp)) != NULL) { 262 if (d->d_name[0] != 'c' || d->d_name[1] != 'f') 263 continue; /* daemon control files only */ 264 seteuid(euid); 265 if (stat(d->d_name, &stbuf) < 0) { 266 seteuid(uid); 267 continue; /* Doesn't exist */ 268 } 269 seteuid(uid); 270 q = (struct queue *)malloc(sizeof(time_t)+strlen(d->d_name)+1); 271 if (q == NULL) 272 goto errdone; 273 q->q_time = stbuf.st_mtime; 274 strcpy(q->q_name, d->d_name); 275 /* 276 * Check to make sure the array has space left and 277 * realloc the maximum size. 278 */ 279 if (++nitems > arraysz) { 280 arraysz *= 2; 281 queue = (struct queue **)realloc((char *)queue, 282 arraysz * sizeof(struct queue *)); 283 if (queue == NULL) 284 goto errdone; 285 } 286 queue[nitems-1] = q; 287 } 288 closedir(dirp); 289 if (nitems) 290 qsort(queue, nitems, sizeof(struct queue *), compar); 291 *namelist = queue; 292 return(nitems); 293 294 errdone: 295 closedir(dirp); 296 return(-1); 297 } 298 299 /* 300 * Compare modification times. 301 */ 302 static int 303 compar(p1, p2) 304 const void *p1, *p2; 305 { 306 if ((*(struct queue **)p1)->q_time < (*(struct queue **)p2)->q_time) 307 return(-1); 308 if ((*(struct queue **)p1)->q_time > (*(struct queue **)p2)->q_time) 309 return(1); 310 return(0); 311 } 312 313 /* 314 * Figure out whether the local machine is the same 315 * as the remote machine (RM) entry (if it exists). 316 */ 317 char * 318 checkremote() 319 { 320 char name[MAXHOSTNAMELEN]; 321 register struct hostent *hp; 322 static char errbuf[128]; 323 char *rp, *rp_b; 324 325 remote = 0; /* assume printer is local */ 326 if (RM != NULL) { 327 /* get the official name of the local host */ 328 gethostname(name, sizeof(name)); 329 name[sizeof(name)-1] = '\0'; 330 hp = gethostbyname(name); 331 if (hp == (struct hostent *) NULL) { 332 (void) snprintf(errbuf, sizeof(errbuf), 333 "unable to get official name for local machine %s", 334 name); 335 return errbuf; 336 } else (void) strcpy(name, hp->h_name); 337 338 /* get the official name of RM */ 339 hp = gethostbyname(RM); 340 if (hp == (struct hostent *) NULL) { 341 (void) snprintf(errbuf, sizeof(errbuf), 342 "unable to get official name for remote machine %s", 343 RM); 344 return errbuf; 345 } 346 347 /* 348 * if the two hosts are not the same, 349 * then the printer must be remote. 350 */ 351 if (strcasecmp(name, hp->h_name) != 0) 352 remote = 1; 353 else if (cgetstr(bp, "rp", &rp) > 0) { 354 if (cgetent(&rp_b, printcapdb, rp) == 0) { 355 if (cgetmatch(rp_b, printer) != 0) 356 remote = 1; 357 free(rp_b); 358 } else { 359 (void) snprintf(errbuf, sizeof(errbuf), 360 "can't find (local) remote printer %s", 361 rp); 362 free(rp); 363 return errbuf; 364 } 365 free(rp); 366 } 367 } 368 return NULL; 369 } 370 371 /* sleep n milliseconds */ 372 void 373 delay(n) 374 { 375 struct timeval tdelay; 376 377 if (n <= 0 || n > 10000) 378 fatal("unreasonable delay period (%d)", n); 379 tdelay.tv_sec = n / 1000; 380 tdelay.tv_usec = n * 1000 % 1000000; 381 (void) select(0, (fd_set *)0, (fd_set *)0, (fd_set *)0, &tdelay); 382 } 383 384 #ifdef __STDC__ 385 #include <stdarg.h> 386 #else 387 #include <varargs.h> 388 #endif 389 390 void 391 #ifdef __STDC__ 392 fatal(const char *msg, ...) 393 #else 394 fatal(msg, va_alist) 395 char *msg; 396 va_dcl 397 #endif 398 { 399 va_list ap; 400 #ifdef __STDC__ 401 va_start(ap, msg); 402 #else 403 va_start(ap); 404 #endif 405 if (from != host) 406 (void)printf("%s: ", host); 407 (void)printf("%s: ", name); 408 if (printer) 409 (void)printf("%s: ", printer); 410 (void)vprintf(msg, ap); 411 va_end(ap); 412 (void)putchar('\n'); 413 exit(1); 414 } 415