recvjob.c revision 1.12
1 /* $NetBSD: recvjob.c,v 1.12 2000/10/11 20:23:52 is Exp $ */ 2 3 /* 4 * Copyright (c) 1983, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #include <sys/cdefs.h> 38 39 #ifndef lint 40 __COPYRIGHT("@(#) Copyright (c) 1983, 1993\n\ 41 The Regents of the University of California. All rights reserved.\n"); 42 #endif /* not lint */ 43 44 #ifndef lint 45 #if 0 46 static char sccsid[] = "@(#)recvjob.c 8.2 (Berkeley) 4/27/95"; 47 #else 48 __RCSID("$NetBSD: recvjob.c,v 1.12 2000/10/11 20:23:52 is Exp $"); 49 #endif 50 #endif /* not lint */ 51 52 /* 53 * Receive printer jobs from the network, queue them and 54 * start the printer daemon. 55 */ 56 #include <sys/param.h> 57 #include <sys/mount.h> 58 #include <sys/stat.h> 59 60 #include <unistd.h> 61 #include <signal.h> 62 #include <fcntl.h> 63 #include <dirent.h> 64 #include <syslog.h> 65 #include <stdio.h> 66 #include <stdlib.h> 67 #include <string.h> 68 #include "lp.h" 69 #include "lp.local.h" 70 #include "extern.h" 71 #include "pathnames.h" 72 73 #define ack() (void)write(1, sp, 1); 74 75 static char dfname[NAME_MAX]; /* data files */ 76 static int minfree; /* keep at least minfree blocks available */ 77 static char *sp = ""; 78 static char tfname[NAME_MAX]; /* tmp copy of cf before linking */ 79 80 static int chksize __P((int)); 81 static void frecverr __P((const char *, ...)) 82 __attribute__((__format__(__printf__, 1, 2))); 83 static int noresponse __P((void)); 84 static void rcleanup __P((int)); 85 static int read_number __P((char *)); 86 static int readfile __P((char *, int)); 87 static int readjob __P((void)); 88 89 90 void 91 recvjob() 92 { 93 struct stat stb; 94 int status; 95 96 /* 97 * Perform lookup for printer name or abbreviation 98 */ 99 if ((status = cgetent(&bp, printcapdb, printer)) == -2) 100 frecverr("cannot open printer description file"); 101 else if (status == -1) 102 frecverr("unknown printer %s", printer); 103 else if (status == -3) 104 fatal("potential reference loop detected in printcap file"); 105 106 if (cgetstr(bp, "lf", &LF) == -1) 107 LF = _PATH_CONSOLE; 108 if (cgetstr(bp, "sd", &SD) == -1) 109 SD = _PATH_DEFSPOOL; 110 if (cgetstr(bp, "lo", &LO) == -1) 111 LO = DEFLOCK; 112 113 (void)close(2); /* set up log file */ 114 if (open(LF, O_WRONLY|O_APPEND, 0664) < 0) { 115 syslog(LOG_ERR, "%s: %m", LF); 116 (void)open(_PATH_DEVNULL, O_WRONLY); 117 } 118 119 if (chdir(SD) < 0) 120 frecverr("%s: %s: %m", printer, SD); 121 if (stat(LO, &stb) == 0) { 122 if (stb.st_mode & 010) { 123 /* queue is disabled */ 124 putchar('\1'); /* return error code */ 125 exit(1); 126 } 127 } else if (stat(SD, &stb) < 0) 128 frecverr("%s: %s: %m", printer, SD); 129 minfree = 2 * read_number("minfree"); /* scale KB to 512 blocks */ 130 signal(SIGTERM, rcleanup); 131 signal(SIGPIPE, rcleanup); 132 133 if (readjob()) 134 printjob(); 135 } 136 137 /* 138 * Read printer jobs sent by lpd and copy them to the spooling directory. 139 * Return the number of jobs successfully transfered. 140 */ 141 static int 142 readjob() 143 { 144 int size, nfiles; 145 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 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 (void)strncpy(cp + 6, from, sizeof(line) - strlen(line) - 1); 184 line[sizeof(line) - 1 ] = '\0'; 185 (void)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 */ 231 static int 232 readfile(file, size) 233 char *file; 234 int size; 235 { 236 char *cp; 237 char buf[BUFSIZ]; 238 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 (void)unlink(file); 271 return(0); 272 } 273 ack(); 274 return(1); 275 } 276 277 static int 278 noresponse() 279 { 280 char resp; 281 282 if (read(1, &resp, 1) != 1) 283 frecverr("Lost connection"); 284 if (resp == '\0') 285 return(0); 286 return(1); 287 } 288 289 /* 290 * Check to see if there is enough space on the disk for size bytes. 291 * 1 == OK, 0 == Not OK. 292 */ 293 static int 294 chksize(size) 295 int size; 296 { 297 int spacefree; 298 struct statfs sfb; 299 300 if (statfs(".", &sfb) < 0) { 301 syslog(LOG_ERR, "%s: %m", "statfs(\".\")"); 302 return (1); 303 } 304 spacefree = sfb.f_bavail * (sfb.f_bsize / 512); 305 size = (size + 511) / 512; 306 if (minfree + size > spacefree) 307 return(0); 308 return(1); 309 } 310 311 static int 312 read_number(fn) 313 char *fn; 314 { 315 char lin[80]; 316 FILE *fp; 317 318 if ((fp = fopen(fn, "r")) == NULL) 319 return (0); 320 if (fgets(lin, 80, fp) == NULL) { 321 fclose(fp); 322 return (0); 323 } 324 fclose(fp); 325 return (atoi(lin)); 326 } 327 328 /* 329 * Remove all the files associated with the current job being transfered. 330 */ 331 static void 332 rcleanup(signo) 333 int signo; 334 { 335 if (tfname[0]) 336 (void)unlink(tfname); 337 if (dfname[0]) 338 do { 339 do { 340 if (strchr(dfname, '/') == 0) 341 (void)unlink(dfname); 342 } while (dfname[2]-- != 'A'); 343 dfname[2] = 'z'; 344 } while (dfname[0]-- != 'd'); 345 dfname[0] = '\0'; 346 } 347 348 #ifdef __STDC__ 349 #include <stdarg.h> 350 #else 351 #include <varargs.h> 352 #endif 353 354 static void 355 #ifdef __STDC__ 356 frecverr(const char *msg, ...) 357 #else 358 frecverr(msg, va_alist) 359 char *msg; 360 va_dcl 361 #endif 362 { 363 extern char fromb[]; 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
Indexes created Mon Sep 29 21:09:56 GMT 2025