1 /* $OpenBSD: common.c,v 1.5 1997/07/19 07:11:41 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 1.5 1997/07/19 07:11:41 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, 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 return(s); 191 } 192 193 /* 194 * Getline reads a line from the control file cfp, removes tabs, converts 195 * new-line to null and leaves it in line. 196 * Returns 0 at EOF or the number of characters read. 197 */ 198 int 199 getline(cfp) 200 FILE *cfp; 201 { 202 register int linel = 0; 203 register char *lp = line; 204 register c; 205 206 while ((c = getc(cfp)) != '\n' && linel+1<sizeof(line)) { 207 if (c == EOF) 208 return(0); 209 if (c == '\t') { 210 do { 211 *lp++ = ' '; 212 linel++; 213 } while ((linel & 07) != 0 && linel+1<sizeof(line)); 214 continue; 215 } 216 *lp++ = c; 217 linel++; 218 } 219 *lp++ = '\0'; 220 return(linel); 221 } 222 223 /* 224 * Scan the current directory and make a list of daemon files sorted by 225 * creation time. 226 * Return the number of entries and a pointer to the list. 227 */ 228 int 229 getq(namelist) 230 struct queue *(*namelist[]); 231 { 232 register struct dirent *d; 233 register struct queue *q, **queue; 234 register int nitems; 235 struct stat stbuf; 236 DIR *dirp; 237 int arraysz; 238 239 seteuid(euid); 240 if ((dirp = opendir(SD)) == NULL) 241 return(-1); 242 if (fstat(dirp->dd_fd, &stbuf) < 0) 243 goto errdone; 244 seteuid(uid); 245 246 /* 247 * Estimate the array size by taking the size of the directory file 248 * and dividing it by a multiple of the minimum size entry. 249 */ 250 arraysz = (stbuf.st_size / 24); 251 queue = (struct queue **)malloc(arraysz * sizeof(struct queue *)); 252 if (queue == NULL) 253 goto errdone; 254 255 nitems = 0; 256 while ((d = readdir(dirp)) != NULL) { 257 if (d->d_name[0] != 'c' || d->d_name[1] != 'f') 258 continue; /* daemon control files only */ 259 seteuid(euid); 260 if (stat(d->d_name, &stbuf) < 0) 261 continue; /* Doesn't exist */ 262 seteuid(uid); 263 q = (struct queue *)malloc(sizeof(time_t)+strlen(d->d_name)+1); 264 if (q == NULL) 265 goto errdone; 266 q->q_time = stbuf.st_mtime; 267 strcpy(q->q_name, d->d_name); 268 /* 269 * Check to make sure the array has space left and 270 * realloc the maximum size. 271 */ 272 if (++nitems > arraysz) { 273 arraysz *= 2; 274 queue = (struct queue **)realloc((char *)queue, 275 arraysz * sizeof(struct queue *)); 276 if (queue == NULL) 277 goto errdone; 278 } 279 queue[nitems-1] = q; 280 } 281 closedir(dirp); 282 if (nitems) 283 qsort(queue, nitems, sizeof(struct queue *), compar); 284 *namelist = queue; 285 return(nitems); 286 287 errdone: 288 closedir(dirp); 289 return(-1); 290 } 291 292 /* 293 * Compare modification times. 294 */ 295 static int 296 compar(p1, p2) 297 const void *p1, *p2; 298 { 299 if ((*(struct queue **)p1)->q_time < (*(struct queue **)p2)->q_time) 300 return(-1); 301 if ((*(struct queue **)p1)->q_time > (*(struct queue **)p2)->q_time) 302 return(1); 303 return(0); 304 } 305 306 /* 307 * Figure out whether the local machine is the same 308 * as the remote machine (RM) entry (if it exists). 309 */ 310 char * 311 checkremote() 312 { 313 char name[MAXHOSTNAMELEN]; 314 register struct hostent *hp; 315 static char errbuf[128]; 316 317 remote = 0; /* assume printer is local */ 318 if (RM != NULL) { 319 /* get the official name of the local host */ 320 gethostname(name, sizeof(name)); 321 name[sizeof(name)-1] = '\0'; 322 hp = gethostbyname(name); 323 if (hp == (struct hostent *) NULL) { 324 (void) snprintf(errbuf, sizeof(errbuf), 325 "unable to get official name for local machine %s", 326 name); 327 return errbuf; 328 } else (void) strcpy(name, hp->h_name); 329 330 /* get the official name of RM */ 331 hp = gethostbyname(RM); 332 if (hp == (struct hostent *) NULL) { 333 (void) snprintf(errbuf, sizeof(errbuf), 334 "unable to get official name for remote machine %s", 335 RM); 336 return errbuf; 337 } 338 339 /* 340 * if the two hosts are not the same, 341 * then the printer must be remote. 342 */ 343 if (strcasecmp(name, hp->h_name) != 0) 344 remote = 1; 345 } 346 return NULL; 347 } 348 349 /* sleep n milliseconds */ 350 void 351 delay(n) 352 { 353 struct timeval tdelay; 354 355 if (n <= 0 || n > 10000) 356 fatal("unreasonable delay period (%d)", n); 357 tdelay.tv_sec = n / 1000; 358 tdelay.tv_usec = n * 1000 % 1000000; 359 (void) select(0, (fd_set *)0, (fd_set *)0, (fd_set *)0, &tdelay); 360 } 361 362 #if __STDC__ 363 #include <stdarg.h> 364 #else 365 #include <varargs.h> 366 #endif 367 368 void 369 #if __STDC__ 370 fatal(const char *msg, ...) 371 #else 372 fatal(msg, va_alist) 373 char *msg; 374 va_dcl 375 #endif 376 { 377 va_list ap; 378 #if __STDC__ 379 va_start(ap, msg); 380 #else 381 va_start(ap); 382 #endif 383 if (from != host) 384 (void)printf("%s: ", host); 385 (void)printf("%s: ", name); 386 if (printer) 387 (void)printf("%s: ", printer); 388 (void)vprintf(msg, ap); 389 va_end(ap); 390 (void)putchar('\n'); 391 exit(1); 392 } 393