recvjob.c revision 32654
1/* 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by the University of 17 * California, Berkeley and its contributors. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35#ifndef lint 36static const char copyright[] = 37"@(#) Copyright (c) 1983, 1993\n\ 38 The Regents of the University of California. All rights reserved.\n"; 39#endif /* not lint */ 40 41#ifndef lint 42#if 0 43static char sccsid[] = "@(#)recvjob.c 8.2 (Berkeley) 4/27/95"; 44#endif 45static const char rcsid[] = 46 "$Id: recvjob.c,v 1.12 1997/12/02 20:45:59 wollman Exp $"; 47#endif /* not lint */ 48 49/* 50 * Receive printer jobs from the network, queue them and 51 * start the printer daemon. 52 */ 53#include <sys/param.h> 54#include <sys/mount.h> 55#include <sys/stat.h> 56 57#include <unistd.h> 58#include <signal.h> 59#include <fcntl.h> 60#include <dirent.h> 61#include <syslog.h> 62#include <stdio.h> 63#include <stdlib.h> 64#include <string.h> 65#include "lp.h" 66#include "lp.local.h" 67#include "extern.h" 68#include "pathnames.h" 69 70#define ack() (void) write(1, sp, 1); 71 72static char dfname[NAME_MAX]; /* data files */ 73static int minfree; /* keep at least minfree blocks available */ 74static char *sp = ""; 75static char tfname[NAME_MAX]; /* tmp copy of cf before linking */ 76 77static int chksize __P((int)); 78static void frecverr __P((const char *, ...)); 79static int noresponse __P((void)); 80static void rcleanup __P((int)); 81static int read_number __P((char *)); 82static int readfile __P((char *, int)); 83static int readjob __P((struct printer *pp)); 84 85 86void 87recvjob(printer) 88 const char *printer; 89{ 90 struct stat stb; 91 int status; 92 struct printer myprinter, *pp = &myprinter; 93 94 /* 95 * Perform lookup for printer name or abbreviation 96 */ 97 init_printer(pp); 98 status = getprintcap(printer, pp); 99 switch (status) { 100 case PCAPERR_OSERR: 101 frecverr("cannot open printer description file"); 102 break; 103 case PCAPERR_NOTFOUND: 104 frecverr("unknown printer %s", printer); 105 break; 106 case PCAPERR_TCLOOP: 107 fatal(pp, "potential reference loop detected in printcap file"); 108 default: 109 break; 110 } 111 112 (void) close(2); /* set up log file */ 113 if (open(pp->log_file, O_WRONLY|O_APPEND, 0664) < 0) { 114 syslog(LOG_ERR, "%s: %m", pp->log_file); 115 (void) open(_PATH_DEVNULL, O_WRONLY); 116 } 117 118 if (chdir(pp->spool_dir) < 0) 119 frecverr("%s: %s: %m", pp->printer, pp->spool_dir); 120 if (stat(pp->lock_file, &stb) == 0) { 121 if (stb.st_mode & 010) { 122 /* queue is disabled */ 123 putchar('\1'); /* return error code */ 124 exit(1); 125 } 126 } else if (stat(pp->spool_dir, &stb) < 0) 127 frecverr("%s: %s: %m", pp->printer, pp->spool_dir); 128 minfree = 2 * read_number("minfree"); /* scale KB to 512 blocks */ 129 signal(SIGTERM, rcleanup); 130 signal(SIGPIPE, rcleanup); 131 132 if (readjob(pp)) 133 printjob(pp); 134} 135 136/* 137 * Read printer jobs sent by lpd and copy them to the spooling directory. 138 * Return the number of jobs successfully transfered. 139 */ 140static int 141readjob(pp) 142 struct printer *pp; 143{ 144 register int size, nfiles; 145 register char *cp; 146 147 ack(); 148 nfiles = 0; 149 for (;;) { 150 /* 151 * Read a command to tell us what to do 152 */ 153 cp = line; 154 do { 155 if ((size = read(1, cp, 1)) != 1) { 156 if (size < 0) 157 frecverr("%s: lost connection", 158 pp->printer); 159 return(nfiles); 160 } 161 } while (*cp++ != '\n' && (cp - line + 1) < sizeof(line)); 162 if (cp - line + 1 >= sizeof(line)) 163 frecverr("readjob overflow"); 164 *--cp = '\0'; 165 cp = line; 166 switch (*cp++) { 167 case '\1': /* cleanup because data sent was bad */ 168 rcleanup(0); 169 continue; 170 171 case '\2': /* read cf file */ 172 size = 0; 173 while (*cp >= '0' && *cp <= '9') 174 size = size * 10 + (*cp++ - '0'); 175 if (*cp++ != ' ') 176 break; 177 /* 178 * host name has been authenticated, we use our 179 * view of the host name since we may be passed 180 * something different than what gethostbyaddr() 181 * returns 182 */ 183 strncpy(cp + 6, from, sizeof(line) + line - cp - 7); 184 line[sizeof(line) - 1 ] = '\0'; 185 strncpy(tfname, cp, sizeof(tfname) - 1); 186 tfname[sizeof (tfname) - 1] = '\0'; 187 tfname[0] = 't'; 188 if (strchr(tfname, '/')) 189 frecverr("readjob: %s: illegal path name", 190 tfname); 191 if (!chksize(size)) { 192 (void) write(1, "\2", 1); 193 continue; 194 } 195 if (!readfile(tfname, size)) { 196 rcleanup(0); 197 continue; 198 } 199 if (link(tfname, cp) < 0) 200 frecverr("%s: %m", tfname); 201 (void) unlink(tfname); 202 tfname[0] = '\0'; 203 nfiles++; 204 continue; 205 206 case '\3': /* read df file */ 207 size = 0; 208 while (*cp >= '0' && *cp <= '9') 209 size = size * 10 + (*cp++ - '0'); 210 if (*cp++ != ' ') 211 break; 212 if (!chksize(size)) { 213 (void) write(1, "\2", 1); 214 continue; 215 } 216 (void) strncpy(dfname, cp, sizeof(dfname) - 1); 217 dfname[sizeof(dfname) - 1] = '\0'; 218 if (strchr(dfname, '/')) 219 frecverr("readjob: %s: illegal path name", 220 dfname); 221 (void) readfile(dfname, size); 222 continue; 223 } 224 frecverr("protocol screwup: %s", line); 225 } 226} 227 228/* 229 * Read files send by lpd and copy them to the spooling directory. 230 */ 231static int 232readfile(file, size) 233 char *file; 234 int size; 235{ 236 register char *cp; 237 char buf[BUFSIZ]; 238 register int i, j, amt; 239 int fd, err; 240 241 fd = open(file, O_CREAT|O_EXCL|O_WRONLY, FILMOD); 242 if (fd < 0) 243 frecverr("readfile: %s: illegal path name: %m", file); 244 ack(); 245 err = 0; 246 for (i = 0; i < size; i += BUFSIZ) { 247 amt = BUFSIZ; 248 cp = buf; 249 if (i + amt > size) 250 amt = size - i; 251 do { 252 j = read(1, cp, amt); 253 if (j <= 0) 254 frecverr("lost connection"); 255 amt -= j; 256 cp += j; 257 } while (amt > 0); 258 amt = BUFSIZ; 259 if (i + amt > size) 260 amt = size - i; 261 if (write(fd, buf, amt) != amt) { 262 err++; 263 break; 264 } 265 } 266 (void) close(fd); 267 if (err) 268 frecverr("%s: write error", file); 269 if (noresponse()) { /* file sent had bad data in it */ 270 if (strchr(file, '/') == NULL) 271 (void) unlink(file); 272 return(0); 273 } 274 ack(); 275 return(1); 276} 277 278static int 279noresponse() 280{ 281 char resp; 282 283 if (read(1, &resp, 1) != 1) 284 frecverr("lost connection"); 285 if (resp == '\0') 286 return(0); 287 return(1); 288} 289 290/* 291 * Check to see if there is enough space on the disk for size bytes. 292 * 1 == OK, 0 == Not OK. 293 */ 294static int 295chksize(size) 296 int size; 297{ 298 int spacefree; 299 struct statfs sfb; 300 301 if (statfs(".", &sfb) < 0) { 302 syslog(LOG_ERR, "%s: %m", "statfs(\".\")"); 303 return (1); 304 } 305 spacefree = sfb.f_bavail * (sfb.f_bsize / 512); 306 size = (size + 511) / 512; 307 if (minfree + size > spacefree) 308 return(0); 309 return(1); 310} 311 312static int 313read_number(fn) 314 char *fn; 315{ 316 char lin[80]; 317 register FILE *fp; 318 319 if ((fp = fopen(fn, "r")) == NULL) 320 return (0); 321 if (fgets(lin, 80, fp) == NULL) { 322 fclose(fp); 323 return (0); 324 } 325 fclose(fp); 326 return (atoi(lin)); 327} 328 329/* 330 * Remove all the files associated with the current job being transfered. 331 */ 332static void 333rcleanup(signo) 334 int signo; 335{ 336 if (tfname[0] && strchr(tfname, '/') == NULL) 337 (void) unlink(tfname); 338 if (dfname[0] && strchr(dfname, '/') == NULL) { 339 do { 340 do 341 (void) unlink(dfname); 342 while (dfname[2]-- != 'A'); 343 dfname[2] = 'z'; 344 } while (dfname[0]-- != 'd'); 345 } 346 dfname[0] = '\0'; 347} 348 349#ifdef __STDC__ 350#include <stdarg.h> 351#else 352#include <varargs.h> 353#endif 354 355static void 356#ifdef __STDC__ 357frecverr(const char *msg, ...) 358#else 359frecverr(msg, va_alist) 360 char *msg; 361 va_dcl 362#endif 363{ 364 va_list ap; 365#ifdef __STDC__ 366 va_start(ap, msg); 367#else 368 va_start(ap); 369#endif 370 rcleanup(0); 371 syslog(LOG_ERR, "%s", fromb); 372 vsyslog(LOG_ERR, msg, ap); 373 va_end(ap); 374 putchar('\1'); /* return error code */ 375 exit(1); 376} 377