recvjob.c revision 1.14
1 /* $NetBSD: recvjob.c,v 1.14 2001/12/04 22:52:44 christos 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 1.14 2001/12/04 22:52:44 christos 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(STDOUT_FILENO, 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(void) 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(void) 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(STDOUT_FILENO, 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)strlcpy(cp + 6, from, 184 sizeof(line) + line - cp - 6); 185 if (strchr(cp, '/')) 186 frecverr("readjob: %s: illegal path name", cp); 187 (void)strlcpy(tfname, cp, sizeof(tfname)); 188 tfname[0] = 't'; 189 if (!chksize(size)) { 190 (void)write(STDOUT_FILENO, "\2", 1); 191 continue; 192 } 193 if (!readfile(tfname, size)) { 194 rcleanup(0); 195 continue; 196 } 197 if (link(tfname, cp) < 0) 198 frecverr("%s: %m", tfname); 199 (void)unlink(tfname); 200 tfname[0] = '\0'; 201 nfiles++; 202 continue; 203 204 case '\3': /* read df file */ 205 size = 0; 206 while (*cp >= '0' && *cp <= '9') 207 size = size * 10 + (*cp++ - '0'); 208 if (*cp++ != ' ') 209 break; 210 if (!chksize(size)) { 211 (void)write(STDOUT_FILENO, "\2", 1); 212 continue; 213 } 214 if (strchr(cp, '/')) 215 frecverr("readjob: %s: illegal path name", cp); 216 (void)strlcpy(dfname, cp, sizeof(dfname)); 217 (void)readfile(dfname, size); 218 continue; 219 } 220 frecverr("protocol screwup: %s", line); 221 } 222 } 223 224 /* 225 * Read files send by lpd and copy them to the spooling directory. 226 */ 227 static int 228 readfile(char *file, int size) 229 { 230 char *cp; 231 char buf[BUFSIZ]; 232 int i, j, amt; 233 int fd, err; 234 235 fd = open(file, O_CREAT|O_EXCL|O_WRONLY, FILMOD); 236 if (fd < 0) 237 frecverr("readfile: %s: illegal path name: %m", file); 238 ack(); 239 err = 0; 240 for (i = 0; i < size; i += BUFSIZ) { 241 amt = BUFSIZ; 242 cp = buf; 243 if (i + amt > size) 244 amt = size - i; 245 do { 246 j = read(STDOUT_FILENO, cp, amt); 247 if (j <= 0) 248 frecverr("Lost connection"); 249 amt -= j; 250 cp += j; 251 } while (amt > 0); 252 amt = BUFSIZ; 253 if (i + amt > size) 254 amt = size - i; 255 if (write(fd, buf, amt) != amt) { 256 err++; 257 break; 258 } 259 } 260 (void)close(fd); 261 if (err) 262 frecverr("%s: write error", file); 263 if (noresponse()) { /* file sent had bad data in it */ 264 (void)unlink(file); 265 return(0); 266 } 267 ack(); 268 return(1); 269 } 270 271 static int 272 noresponse(void) 273 { 274 char resp; 275 276 if (read(STDOUT_FILENO, &resp, 1) != 1) 277 frecverr("Lost connection"); 278 if (resp == '\0') 279 return(0); 280 return(1); 281 } 282 283 /* 284 * Check to see if there is enough space on the disk for size bytes. 285 * 1 == OK, 0 == Not OK. 286 */ 287 static int 288 chksize(int size) 289 { 290 int spacefree; 291 struct statfs sfb; 292 293 if (statfs(".", &sfb) < 0) { 294 syslog(LOG_ERR, "%s: %m", "statfs(\".\")"); 295 return (1); 296 } 297 spacefree = sfb.f_bavail * (sfb.f_bsize / 512); 298 size = (size + 511) / 512; 299 if (minfree + size > spacefree) 300 return(0); 301 return(1); 302 } 303 304 static int 305 read_number(fn) 306 char *fn; 307 { 308 char lin[80]; 309 FILE *fp; 310 311 if ((fp = fopen(fn, "r")) == NULL) 312 return (0); 313 if (fgets(lin, 80, fp) == NULL) { 314 fclose(fp); 315 return (0); 316 } 317 fclose(fp); 318 return (atoi(lin)); 319 } 320 321 /* 322 * Remove all the files associated with the current job being transfered. 323 */ 324 static void 325 rcleanup(int signo) 326 { 327 if (tfname[0]) 328 (void)unlink(tfname); 329 if (dfname[0]) 330 do { 331 do { 332 if (strchr(dfname, '/') == 0) 333 (void)unlink(dfname); 334 } while (dfname[2]-- != 'A'); 335 dfname[2] = 'z'; 336 } while (dfname[0]-- != 'd'); 337 dfname[0] = '\0'; 338 } 339 340 #ifdef __STDC__ 341 #include <stdarg.h> 342 #else 343 #include <varargs.h> 344 #endif 345 346 static void 347 #ifdef __STDC__ 348 frecverr(const char *msg, ...) 349 #else 350 frecverr(msg, va_alist) 351 char *msg; 352 va_dcl 353 #endif 354 { 355 extern char fromb[]; 356 va_list ap; 357 #ifdef __STDC__ 358 va_start(ap, msg); 359 #else 360 va_start(ap); 361 #endif 362 rcleanup(0); 363 syslog(LOG_ERR, "%s", fromb); 364 vsyslog(LOG_ERR, msg, ap); 365 va_end(ap); 366 putchar('\1'); /* return error code */ 367 exit(1); 368 } 369
Indexes created Sat Sep 27 22:09:54 GMT 2025