1 /* $NetBSD: common.c,v 1.22 2001/04/05 13:30:02 wiz 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 #include <sys/cdefs.h> 42 #ifndef lint 43 #if 0 44 static char sccsid[] = "@(#)common.c 8.5 (Berkeley) 4/28/95"; 45 #else 46 __RCSID("$NetBSD: common.c,v 1.22 2001/04/05 13:30:02 wiz Exp $"); 47 #endif 48 #endif /* not lint */ 49 50 #include <sys/param.h> 51 #include <sys/stat.h> 52 #include <sys/time.h> 53 54 #include <sys/socket.h> 55 #include <netinet/in.h> 56 #include <arpa/inet.h> 57 #include <netdb.h> 58 59 #include <dirent.h> 60 #include <errno.h> 61 #include <unistd.h> 62 #include <stdlib.h> 63 #include <stdio.h> 64 #include <string.h> 65 #include <ifaddrs.h> 66 #include "lp.h" 67 #include "pathnames.h" 68 69 /* 70 * Routines and data common to all the line printer functions. 71 */ 72 73 char *AF; /* accounting file */ 74 long BR; /* baud rate if lp is a tty */ 75 char *CF; /* name of cifplot filter (per job) */ 76 char *DF; /* name of tex filter (per job) */ 77 long DU; /* daeomon user-id */ 78 long FC; /* flags to clear if lp is a tty */ 79 char *FF; /* form feed string */ 80 long FS; /* flags to set if lp is a tty */ 81 char *GF; /* name of graph(1G) filter (per job) */ 82 long HL; /* print header last */ 83 char *IF; /* name of input filter (created per job) */ 84 char *LF; /* log file for error messages */ 85 char *LO; /* lock file name */ 86 char *LP; /* line printer device name */ 87 long MC; /* maximum number of copies allowed */ 88 char *MS; /* stty flags to set if lp is a tty */ 89 long MX; /* maximum number of blocks to copy */ 90 char *NF; /* name of ditroff filter (per job) */ 91 char *OF; /* name of output filter (created once) */ 92 char *PF; /* name of vrast filter (per job) */ 93 long PL; /* page length */ 94 long PW; /* page width */ 95 long PX; /* page width in pixels */ 96 long PY; /* page length in pixels */ 97 char *RF; /* name of fortran text filter (per job) */ 98 char *RG; /* resricted group */ 99 char *RM; /* remote machine name */ 100 char *RP; /* remote printer name */ 101 long RS; /* restricted to those with local accounts */ 102 long RW; /* open LP for reading and writing */ 103 long SB; /* short banner instead of normal header */ 104 long SC; /* suppress multiple copies */ 105 char *SD; /* spool directory */ 106 long SF; /* suppress FF on each print job */ 107 long SH; /* suppress header page */ 108 char *ST; /* status file name */ 109 char *TF; /* name of troff filter (per job) */ 110 char *TR; /* trailer string to be output when Q empties */ 111 char *VF; /* name of vplot filter (per job) */ 112 long XC; /* flags to clear for local mode */ 113 long XS; /* flags to set for local mode */ 114 115 char line[BUFSIZ]; 116 int remote; /* true if sending files to a remote host */ 117 118 extern uid_t uid, euid; 119 120 static int compar __P((const void *, const void *)); 121 122 /* 123 * Create a TCP connection to host "rhost" at port "rport". 124 * If rport == 0, then use the printer service port. 125 * Most of this code comes from rcmd.c. 126 */ 127 int 128 getport(rhost, rport) 129 char *rhost; 130 int rport; 131 { 132 struct addrinfo hints, *res, *r; 133 u_int timo = 1; 134 int s, lport = IPPORT_RESERVED - 1; 135 int error; 136 int refuse, trial; 137 char pbuf[NI_MAXSERV]; 138 139 /* 140 * Get the host address and port number to connect to. 141 */ 142 if (rhost == NULL) 143 fatal("no remote host to connect to"); 144 memset(&hints, 0, sizeof(hints)); 145 hints.ai_family = PF_UNSPEC; 146 hints.ai_socktype = SOCK_STREAM; 147 if (rport) 148 snprintf(pbuf, sizeof(pbuf), "%d", rport); 149 else 150 snprintf(pbuf, sizeof(pbuf), "printer"); 151 error = getaddrinfo(rhost, pbuf, &hints, &res); 152 if (error) 153 fatal("printer/tcp: %s", gai_strerror(error)); 154 155 /* 156 * Try connecting to the server. 157 */ 158 retry: 159 s = -1; 160 refuse = trial = 0; 161 for (r = res; r; r = r->ai_next) { 162 trial++; 163 retryport: 164 seteuid(euid); 165 s = rresvport_af(&lport, r->ai_family); 166 seteuid(uid); 167 if (s < 0) 168 return(-1); 169 if (connect(s, r->ai_addr, r->ai_addrlen) < 0) { 170 error = errno; 171 (void)close(s); 172 s = -1; 173 errno = error; 174 if (errno == EADDRINUSE) { 175 lport--; 176 goto retryport; 177 } else if (errno == ECONNREFUSED) 178 refuse++; 179 continue; 180 } else 181 break; 182 } 183 if (s < 0 && trial == refuse && timo <= 16) { 184 sleep(timo); 185 timo *= 2; 186 goto retry; 187 } 188 if (res) 189 freeaddrinfo(res); 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 int linel = 0, c; 203 char *lp = line; 204 205 while ((c = getc(cfp)) != '\n' && linel+1<sizeof(line)) { 206 if (c == EOF) 207 return(0); 208 if (c == '\t') { 209 do { 210 *lp++ = ' '; 211 linel++; 212 } while ((linel & 07) != 0 && linel+1 < sizeof(line)); 213 continue; 214 } 215 *lp++ = c; 216 linel++; 217 } 218 *lp++ = '\0'; 219 return(linel); 220 } 221 222 /* 223 * Scan the current directory and make a list of daemon files sorted by 224 * creation time. 225 * Return the number of entries and a pointer to the list. 226 */ 227 int 228 getq(namelist) 229 struct queue *(*namelist[]); 230 { 231 struct dirent *d; 232 struct queue *q, **queue; 233 struct stat stbuf; 234 DIR *dirp; 235 u_int nitems, arraysz; 236 237 seteuid(euid); 238 dirp = opendir(SD); 239 seteuid(uid); 240 if (dirp == NULL) 241 return(-1); 242 if (fstat(dirp->dd_fd, &stbuf) < 0) 243 goto errdone; 244 245 /* 246 * Estimate the array size by taking the size of the directory file 247 * and dividing it by a multiple of the minimum size entry. 248 */ 249 arraysz = (int)(stbuf.st_size / 24); 250 queue = (struct queue **)malloc(arraysz * sizeof(struct queue *)); 251 if (queue == NULL) 252 goto errdone; 253 254 nitems = 0; 255 while ((d = readdir(dirp)) != NULL) { 256 if (d->d_name[0] != 'c' || d->d_name[1] != 'f') 257 continue; /* daemon control files only */ 258 seteuid(euid); 259 if (stat(d->d_name, &stbuf) < 0) { 260 seteuid(uid); 261 continue; /* Doesn't exist */ 262 } 263 seteuid(uid); 264 q = (struct queue *)malloc(sizeof(time_t)+strlen(d->d_name)+1); 265 if (q == NULL) 266 goto errdone; 267 q->q_time = stbuf.st_mtime; 268 strcpy(q->q_name, d->d_name); /* XXX: strcpy is safe */ 269 /* 270 * Check to make sure the array has space left and 271 * realloc the maximum size. 272 */ 273 if (++nitems > arraysz) { 274 arraysz *= 2; 275 queue = (struct queue **)realloc(queue, 276 arraysz * sizeof(struct queue *)); 277 if (queue == NULL) 278 goto errdone; 279 } 280 queue[nitems-1] = q; 281 } 282 closedir(dirp); 283 if (nitems) 284 qsort(queue, nitems, sizeof(struct queue *), compar); 285 *namelist = queue; 286 return(nitems); 287 288 errdone: 289 closedir(dirp); 290 return(-1); 291 } 292 293 /* 294 * Compare modification times. 295 */ 296 static int 297 compar(p1, p2) 298 const void *p1, *p2; 299 { 300 if ((*(struct queue **)p1)->q_time < (*(struct queue **)p2)->q_time) 301 return(-1); 302 if ((*(struct queue **)p1)->q_time > (*(struct queue **)p2)->q_time) 303 return(1); 304 return(0); 305 } 306 307 /* 308 * Figure out whether the local machine is the same 309 * as the remote machine (RM) entry (if it exists). 310 */ 311 char * 312 checkremote() 313 { 314 char lname[NI_MAXHOST], rname[NI_MAXHOST]; 315 struct addrinfo hints, *res, *res0; 316 static char errbuf[128]; 317 int error; 318 struct ifaddrs *ifap, *ifa; 319 #ifdef NI_WITHSCOPEID 320 const int niflags = NI_NUMERICHOST | NI_WITHSCOPEID; 321 #else 322 const int niflags = NI_NUMERICHOST; 323 #endif 324 #ifdef __KAME__ 325 struct sockaddr_in6 sin6; 326 struct sockaddr_in6 *sin6p; 327 #endif 328 329 remote = 0; /* assume printer is local on failure */ 330 331 if (RM == NULL) 332 return NULL; 333 334 /* get the local interface addresses */ 335 if (getifaddrs(&ifap) < 0) { 336 (void)snprintf(errbuf, sizeof(errbuf), 337 "unable to get local interface address: %s", 338 strerror(errno)); 339 return errbuf; 340 } 341 342 /* get the remote host addresses (RM) */ 343 memset(&hints, 0, sizeof(hints)); 344 hints.ai_flags = AI_CANONNAME; 345 hints.ai_family = PF_UNSPEC; 346 hints.ai_socktype = SOCK_STREAM; 347 res = NULL; 348 error = getaddrinfo(RM, NULL, &hints, &res0); 349 if (error) { 350 (void)snprintf(errbuf, sizeof(errbuf), 351 "unable to resolve remote machine %s: %s", 352 RM, gai_strerror(error)); 353 freeifaddrs(ifap); 354 return errbuf; 355 } 356 357 remote = 1; /* assume printer is remote */ 358 359 for (res = res0; res; res = res->ai_next) { 360 if (getnameinfo(res->ai_addr, res->ai_addrlen, 361 rname, sizeof(rname), NULL, 0, niflags) != 0) 362 continue; 363 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 364 #ifdef __KAME__ 365 sin6p = (struct sockaddr_in6 *)ifa->ifa_addr; 366 if (ifa->ifa_addr->sa_family == AF_INET6 && 367 ifa->ifa_addr->sa_len == sizeof(sin6) && 368 IN6_IS_ADDR_LINKLOCAL(&sin6p->sin6_addr) && 369 *(u_int16_t *)&sin6p->sin6_addr.s6_addr[2]) { 370 /* kame scopeid hack */ 371 memcpy(&sin6, ifa->ifa_addr, sizeof(sin6)); 372 sin6.sin6_scope_id = 373 ntohs(*(u_int16_t *)&sin6p->sin6_addr.s6_addr[2]); 374 sin6.sin6_addr.s6_addr[2] = 0; 375 sin6.sin6_addr.s6_addr[3] = 0; 376 if (getnameinfo((struct sockaddr *)&sin6, 377 sin6.sin6_len, lname, sizeof(lname), 378 NULL, 0, niflags) != 0) 379 continue; 380 } else 381 #endif 382 if (getnameinfo(ifa->ifa_addr, ifa->ifa_addr->sa_len, 383 lname, sizeof(lname), NULL, 0, niflags) != 0) 384 continue; 385 386 if (strcmp(rname, lname) == 0) { 387 remote = 0; 388 goto done; 389 } 390 } 391 } 392 done: 393 freeaddrinfo(res0); 394 freeifaddrs(ifap); 395 return NULL; 396 } 397 398 /* sleep n milliseconds */ 399 void 400 delay(n) 401 int n; 402 { 403 struct timeval tdelay; 404 405 if (n <= 0 || n > 10000) 406 fatal("unreasonable delay period (%d)", n); 407 tdelay.tv_sec = n / 1000; 408 tdelay.tv_usec = n * 1000 % 1000000; 409 (void) select(0, (fd_set *)0, (fd_set *)0, (fd_set *)0, &tdelay); 410 } 411