recvjob.c revision 1.10
1 /* $NetBSD: recvjob.c,v 1.10 1997/10/05 15:12:15 mrg 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 1.10 1997/10/05 15:12:15 mrg 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 static int noresponse __P((void)); 83 static void rcleanup __P((int)); 84 static int read_number __P((char *)); 85 static int readfile __P((char *, int)); 86 static int readjob __P((void)); 87 88 89 void 90 recvjob() 91 { 92 struct stat stb; 93 int status; 94 95 /* 96 * Perform lookup for printer name or abbreviation 97 */ 98 if ((status = cgetent(&bp, printcapdb, printer)) == -2) 99 frecverr("cannot open printer description file"); 100 else if (status == -1) 101 frecverr("unknown printer %s", printer); 102 else if (status == -3) 103 fatal("potential reference loop detected in printcap file"); 104 105 if (cgetstr(bp, "lf", &LF) == -1) 106 LF = _PATH_CONSOLE; 107 if (cgetstr(bp, "sd", &SD) == -1) 108 SD = _PATH_DEFSPOOL; 109 if (cgetstr(bp, "lo", &LO) == -1) 110 LO = DEFLOCK; 111 112 (void)close(2); /* set up log file */ 113 if (open(LF, O_WRONLY|O_APPEND, 0664) < 0) { 114 syslog(LOG_ERR, "%s: %m", LF); 115 (void)open(_PATH_DEVNULL, O_WRONLY); 116 } 117 118 if (chdir(SD) < 0) 119 frecverr("%s: %s: %m", printer, SD); 120 if (stat(LO, &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(SD, &stb) < 0) 127 frecverr("%s: %s: %m", printer, SD); 128 minfree = 2 * read_number("minfree"); /* scale KB to 512 blocks */ 129 signal(SIGTERM, rcleanup); 130 signal(SIGPIPE, rcleanup); 131 132 if (readjob()) 133 printjob(); 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 */ 140 static int 141 readjob() 142 { 143 int size, nfiles; 144 char *cp; 145 146 ack(); 147 nfiles = 0; 148 for (;;) { 149 /* 150 * Read a command to tell us what to do 151 */ 152 cp = line; 153 do { 154 if ((size = read(1, cp, 1)) != 1) { 155 if (size < 0) 156 frecverr("%s: Lost connection", 157 printer); 158 return(nfiles); 159 } 160 } while (*cp++ != '\n' && (cp - line + 1) < sizeof(line)); 161 if (cp - line + 1 >= sizeof(line)) 162 frecverr("readjob overflow"); 163 *--cp = '\0'; 164 cp = line; 165 switch (*cp++) { 166 case '\1': /* cleanup because data sent was bad */ 167 rcleanup(0); 168 continue; 169 170 case '\2': /* read cf file */ 171 size = 0; 172 while (*cp >= '0' && *cp <= '9') 173 size = size * 10 + (*cp++ - '0'); 174 if (*cp++ != ' ') 175 break; 176 /* 177 * host name has been authenticated, we use our 178 * view of the host name since we may be passed 179 * something different than what gethostbyaddr() 180 * returns 181 */ 182 (void)strncpy(cp + 6, from, sizeof(line) - strlen(line) - 1); 183 line[sizeof(line) - 1 ] = '\0'; 184 (void)strncpy(tfname, cp, sizeof(tfname) - 1); 185 tfname[sizeof(tfname) - 1 ] = '\0'; 186 tfname[0] = 't'; 187 if (strchr(tfname, '/')) 188 frecverr("readjob: %s: illegal path name", 189 tfname); 190 if (!chksize(size)) { 191 (void)write(1, "\2", 1); 192 continue; 193 } 194 if (!readfile(tfname, size)) { 195 rcleanup(0); 196 continue; 197 } 198 if (link(tfname, cp) < 0) 199 frecverr("%s: %m", tfname); 200 (void)unlink(tfname); 201 tfname[0] = '\0'; 202 nfiles++; 203 continue; 204 205 case '\3': /* read df file */ 206 size = 0; 207 while (*cp >= '0' && *cp <= '9') 208 size = size * 10 + (*cp++ - '0'); 209 if (*cp++ != ' ') 210 break; 211 if (!chksize(size)) { 212 (void)write(1, "\2", 1); 213 continue; 214 } 215 (void)strncpy(dfname, cp, sizeof(dfname) - 1); 216 dfname[sizeof(dfname) - 1] = '\0'; 217 if (strchr(dfname, '/')) 218 frecverr("readjob: %s: illegal path name", 219 dfname); 220 (void)readfile(dfname, size); 221 continue; 222 } 223 frecverr("protocol screwup: %s", line); 224 } 225 } 226 227 /* 228 * Read files send by lpd and copy them to the spooling directory. 229 */ 230 static int 231 readfile(file, size) 232 char *file; 233 int size; 234 { 235 char *cp; 236 char buf[BUFSIZ]; 237 int i, j, amt; 238 int fd, err; 239 240 fd = open(file, O_CREAT|O_EXCL|O_WRONLY, FILMOD); 241 if (fd < 0) 242 frecverr("readfile: %s: illegal path name: %m", file); 243 ack(); 244 err = 0; 245 for (i = 0; i < size; i += BUFSIZ) { 246 amt = BUFSIZ; 247 cp = buf; 248 if (i + amt > size) 249 amt = size - i; 250 do { 251 j = read(1, cp, amt); 252 if (j <= 0) 253 frecverr("Lost connection"); 254 amt -= j; 255 cp += j; 256 } while (amt > 0); 257 amt = BUFSIZ; 258 if (i + amt > size) 259 amt = size - i; 260 if (write(fd, buf, amt) != amt) { 261 err++; 262 break; 263 } 264 } 265 (void)close(fd); 266 if (err) 267 frecverr("%s: write error", file); 268 if (noresponse()) { /* file sent had bad data in it */ 269 (void)unlink(file); 270 return(0); 271 } 272 ack(); 273 return(1); 274 } 275 276 static int 277 noresponse() 278 { 279 char resp; 280 281 if (read(1, &resp, 1) != 1) 282 frecverr("Lost connection"); 283 if (resp == '\0') 284 return(0); 285 return(1); 286 } 287 288 /* 289 * Check to see if there is enough space on the disk for size bytes. 290 * 1 == OK, 0 == Not OK. 291 */ 292 static int 293 chksize(size) 294 int size; 295 { 296 int spacefree; 297 struct statfs sfb; 298 299 if (statfs(".", &sfb) < 0) { 300 syslog(LOG_ERR, "%s: %m", "statfs(\".\")"); 301 return (1); 302 } 303 spacefree = sfb.f_bavail * (sfb.f_bsize / 512); 304 size = (size + 511) / 512; 305 if (minfree + size > spacefree) 306 return(0); 307 return(1); 308 } 309 310 static int 311 read_number(fn) 312 char *fn; 313 { 314 char lin[80]; 315 FILE *fp; 316 317 if ((fp = fopen(fn, "r")) == NULL) 318 return (0); 319 if (fgets(lin, 80, fp) == NULL) { 320 fclose(fp); 321 return (0); 322 } 323 fclose(fp); 324 return (atoi(lin)); 325 } 326 327 /* 328 * Remove all the files associated with the current job being transfered. 329 */ 330 static void 331 rcleanup(signo) 332 int signo; 333 { 334 if (tfname[0]) 335 (void)unlink(tfname); 336 if (dfname[0]) 337 do { 338 do 339 (void)unlink(dfname); 340 while (dfname[2]-- != 'A'); 341 dfname[2] = 'z'; 342 } while (dfname[0]-- != 'd'); 343 dfname[0] = '\0'; 344 } 345 346 #ifdef __STDC__ 347 #include <stdarg.h> 348 #else 349 #include <varargs.h> 350 #endif 351 352 static void 353 #ifdef __STDC__ 354 frecverr(const char *msg, ...) 355 #else 356 frecverr(msg, va_alist) 357 char *msg; 358 va_dcl 359 #endif 360 { 361 extern char fromb[]; 362 va_list ap; 363 #ifdef __STDC__ 364 va_start(ap, msg); 365 #else 366 va_start(ap); 367 #endif 368 rcleanup(0); 369 syslog(LOG_ERR, "%s", fromb); 370 vsyslog(LOG_ERR, msg, ap); 371 va_end(ap); 372 putchar('\1'); /* return error code */ 373 exit(1); 374 } 375
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