recvjob.c revision 78146
11553Srgrimes/* 21553Srgrimes * Copyright (c) 1983, 1993 31553Srgrimes * The Regents of the University of California. All rights reserved. 41553Srgrimes * 51553Srgrimes * 61553Srgrimes * Redistribution and use in source and binary forms, with or without 71553Srgrimes * modification, are permitted provided that the following conditions 81553Srgrimes * are met: 91553Srgrimes * 1. Redistributions of source code must retain the above copyright 101553Srgrimes * notice, this list of conditions and the following disclaimer. 111553Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 121553Srgrimes * notice, this list of conditions and the following disclaimer in the 131553Srgrimes * documentation and/or other materials provided with the distribution. 141553Srgrimes * 3. All advertising materials mentioning features or use of this software 151553Srgrimes * must display the following acknowledgement: 161553Srgrimes * This product includes software developed by the University of 171553Srgrimes * California, Berkeley and its contributors. 181553Srgrimes * 4. Neither the name of the University nor the names of its contributors 191553Srgrimes * may be used to endorse or promote products derived from this software 201553Srgrimes * without specific prior written permission. 211553Srgrimes * 221553Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 231553Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 241553Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 251553Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 261553Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 271553Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 281553Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 291553Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 301553Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 311553Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 321553Srgrimes * SUCH DAMAGE. 331553Srgrimes */ 341553Srgrimes 351553Srgrimes#ifndef lint 3629780Scharnierstatic const char copyright[] = 371553Srgrimes"@(#) Copyright (c) 1983, 1993\n\ 381553Srgrimes The Regents of the University of California. All rights reserved.\n"; 391553Srgrimes#endif /* not lint */ 401553Srgrimes 411553Srgrimes#ifndef lint 4229780Scharnier#if 0 4315648Sjoergstatic char sccsid[] = "@(#)recvjob.c 8.2 (Berkeley) 4/27/95"; 4429780Scharnier#endif 4529780Scharnierstatic const char rcsid[] = 4650479Speter "$FreeBSD: head/usr.sbin/lpr/lpd/recvjob.c 78146 2001-06-12 16:38:20Z gad $"; 471553Srgrimes#endif /* not lint */ 481553Srgrimes 491553Srgrimes/* 501553Srgrimes * Receive printer jobs from the network, queue them and 511553Srgrimes * start the printer daemon. 521553Srgrimes */ 531553Srgrimes#include <sys/param.h> 541553Srgrimes#include <sys/mount.h> 551553Srgrimes#include <sys/stat.h> 561553Srgrimes 571553Srgrimes#include <unistd.h> 581553Srgrimes#include <signal.h> 591553Srgrimes#include <fcntl.h> 601553Srgrimes#include <dirent.h> 611553Srgrimes#include <syslog.h> 621553Srgrimes#include <stdio.h> 631553Srgrimes#include <stdlib.h> 641553Srgrimes#include <string.h> 651553Srgrimes#include "lp.h" 661553Srgrimes#include "lp.local.h" 671553Srgrimes#include "extern.h" 681553Srgrimes#include "pathnames.h" 691553Srgrimes 701553Srgrimes#define ack() (void) write(1, sp, 1); 711553Srgrimes 7227748Simpstatic char dfname[NAME_MAX]; /* data files */ 731553Srgrimesstatic int minfree; /* keep at least minfree blocks available */ 7478146Sgadstatic const char *sp = ""; 7527748Simpstatic char tfname[NAME_MAX]; /* tmp copy of cf before linking */ 761553Srgrimes 7778146Sgadstatic int chksize(int _size); 7878146Sgadstatic void frecverr(const char *_msg, ...); 7978146Sgadstatic int noresponse(void); 8078146Sgadstatic void rcleanup(int _signo); 8178146Sgadstatic int read_number(const char *_fn); 8278146Sgadstatic int readfile(struct printer *_pp, char *_file, int _size); 8378146Sgadstatic int readjob(struct printer *_pp); 841553Srgrimes 851553Srgrimes 861553Srgrimesvoid 8778146Sgadrecvjob(const char *printer) 881553Srgrimes{ 891553Srgrimes struct stat stb; 901553Srgrimes int status; 9131492Swollman struct printer myprinter, *pp = &myprinter; 921553Srgrimes 931553Srgrimes /* 941553Srgrimes * Perform lookup for printer name or abbreviation 951553Srgrimes */ 9632654Swollman init_printer(pp); 9731492Swollman status = getprintcap(printer, pp); 9831492Swollman switch (status) { 9931492Swollman case PCAPERR_OSERR: 1001553Srgrimes frecverr("cannot open printer description file"); 10131492Swollman break; 10231492Swollman case PCAPERR_NOTFOUND: 1031553Srgrimes frecverr("unknown printer %s", printer); 10431492Swollman break; 10531492Swollman case PCAPERR_TCLOOP: 10631492Swollman fatal(pp, "potential reference loop detected in printcap file"); 10731492Swollman default: 10831492Swollman break; 10931492Swollman } 11027748Simp 1111553Srgrimes (void) close(2); /* set up log file */ 11231492Swollman if (open(pp->log_file, O_WRONLY|O_APPEND, 0664) < 0) { 11331492Swollman syslog(LOG_ERR, "%s: %m", pp->log_file); 1141553Srgrimes (void) open(_PATH_DEVNULL, O_WRONLY); 1151553Srgrimes } 1161553Srgrimes 11731492Swollman if (chdir(pp->spool_dir) < 0) 11831492Swollman frecverr("%s: %s: %m", pp->printer, pp->spool_dir); 11931492Swollman if (stat(pp->lock_file, &stb) == 0) { 1201553Srgrimes if (stb.st_mode & 010) { 1211553Srgrimes /* queue is disabled */ 1221553Srgrimes putchar('\1'); /* return error code */ 1231553Srgrimes exit(1); 1241553Srgrimes } 12531492Swollman } else if (stat(pp->spool_dir, &stb) < 0) 12631492Swollman frecverr("%s: %s: %m", pp->printer, pp->spool_dir); 1271553Srgrimes minfree = 2 * read_number("minfree"); /* scale KB to 512 blocks */ 1281553Srgrimes signal(SIGTERM, rcleanup); 1291553Srgrimes signal(SIGPIPE, rcleanup); 1301553Srgrimes 13131492Swollman if (readjob(pp)) 13231492Swollman printjob(pp); 1331553Srgrimes} 1341553Srgrimes 1351553Srgrimes/* 1361553Srgrimes * Read printer jobs sent by lpd and copy them to the spooling directory. 1371553Srgrimes * Return the number of jobs successfully transfered. 1381553Srgrimes */ 1391553Srgrimesstatic int 14078146Sgadreadjob(struct printer *pp) 1411553Srgrimes{ 14268253Sgad register int size; 1431553Srgrimes register char *cp; 14468735Sgad int cfcnt, dfcnt; 14568735Sgad char givenid[32], givenhost[MAXHOSTNAMELEN]; 1461553Srgrimes 1471553Srgrimes ack(); 14868253Sgad cfcnt = 0; 14968253Sgad dfcnt = 0; 1501553Srgrimes for (;;) { 1511553Srgrimes /* 1521553Srgrimes * Read a command to tell us what to do 1531553Srgrimes */ 1541553Srgrimes cp = line; 1551553Srgrimes do { 1561553Srgrimes if ((size = read(1, cp, 1)) != 1) { 15768380Sgad if (size < 0) { 15829780Scharnier frecverr("%s: lost connection", 15931492Swollman pp->printer); 16068380Sgad /*NOTREACHED*/ 16168380Sgad } 16268253Sgad return (cfcnt); 1631553Srgrimes } 16427748Simp } while (*cp++ != '\n' && (cp - line + 1) < sizeof(line)); 16568380Sgad if (cp - line + 1 >= sizeof(line)) { 16668380Sgad frecverr("%s: readjob overflow", pp->printer); 16768380Sgad /*NOTREACHED*/ 16868380Sgad } 1691553Srgrimes *--cp = '\0'; 1701553Srgrimes cp = line; 1711553Srgrimes switch (*cp++) { 1721553Srgrimes case '\1': /* cleanup because data sent was bad */ 1731553Srgrimes rcleanup(0); 1741553Srgrimes continue; 1751553Srgrimes 1761553Srgrimes case '\2': /* read cf file */ 1771553Srgrimes size = 0; 17868253Sgad dfcnt = 0; 1791553Srgrimes while (*cp >= '0' && *cp <= '9') 1801553Srgrimes size = size * 10 + (*cp++ - '0'); 1811553Srgrimes if (*cp++ != ' ') 1821553Srgrimes break; 1831553Srgrimes /* 1841553Srgrimes * host name has been authenticated, we use our 1851553Srgrimes * view of the host name since we may be passed 1861553Srgrimes * something different than what gethostbyaddr() 1871553Srgrimes * returns 1881553Srgrimes */ 18927748Simp strncpy(cp + 6, from, sizeof(line) + line - cp - 7); 19027748Simp line[sizeof(line) - 1 ] = '\0'; 19127748Simp strncpy(tfname, cp, sizeof(tfname) - 1); 19227748Simp tfname[sizeof (tfname) - 1] = '\0'; 1931553Srgrimes tfname[0] = 't'; 19427748Simp if (strchr(tfname, '/')) 19527748Simp frecverr("readjob: %s: illegal path name", 19627748Simp tfname); 1971553Srgrimes if (!chksize(size)) { 1981553Srgrimes (void) write(1, "\2", 1); 1991553Srgrimes continue; 2001553Srgrimes } 20168380Sgad if (!readfile(pp, tfname, size)) { 2021553Srgrimes rcleanup(0); 2031553Srgrimes continue; 2041553Srgrimes } 2051553Srgrimes if (link(tfname, cp) < 0) 2061553Srgrimes frecverr("%s: %m", tfname); 2071553Srgrimes (void) unlink(tfname); 2081553Srgrimes tfname[0] = '\0'; 20968253Sgad cfcnt++; 2101553Srgrimes continue; 2111553Srgrimes 2121553Srgrimes case '\3': /* read df file */ 21368253Sgad *givenid = '\0'; 21468253Sgad *givenhost = '\0'; 2151553Srgrimes size = 0; 2161553Srgrimes while (*cp >= '0' && *cp <= '9') 2171553Srgrimes size = size * 10 + (*cp++ - '0'); 2181553Srgrimes if (*cp++ != ' ') 2191553Srgrimes break; 2201553Srgrimes if (!chksize(size)) { 2211553Srgrimes (void) write(1, "\2", 1); 2221553Srgrimes continue; 2231553Srgrimes } 22427748Simp (void) strncpy(dfname, cp, sizeof(dfname) - 1); 22527748Simp dfname[sizeof(dfname) - 1] = '\0'; 22668380Sgad if (strchr(dfname, '/')) { 2271553Srgrimes frecverr("readjob: %s: illegal path name", 2281553Srgrimes dfname); 22968380Sgad /*NOTREACHED*/ 23068380Sgad } 23168253Sgad dfcnt++; 23268253Sgad trstat_init(pp, dfname, dfcnt); 23368380Sgad (void) readfile(pp, dfname, size); 23468253Sgad trstat_write(pp, TR_RECVING, size, givenid, from, 23568253Sgad givenhost); 2361553Srgrimes continue; 2371553Srgrimes } 2381553Srgrimes frecverr("protocol screwup: %s", line); 23968380Sgad /*NOTREACHED*/ 2401553Srgrimes } 2411553Srgrimes} 2421553Srgrimes 2431553Srgrimes/* 2441553Srgrimes * Read files send by lpd and copy them to the spooling directory. 2451553Srgrimes */ 2461553Srgrimesstatic int 24778146Sgadreadfile(struct printer *pp, char *file, int size) 2481553Srgrimes{ 2491553Srgrimes register char *cp; 2501553Srgrimes char buf[BUFSIZ]; 2511553Srgrimes register int i, j, amt; 2521553Srgrimes int fd, err; 2531553Srgrimes 2541553Srgrimes fd = open(file, O_CREAT|O_EXCL|O_WRONLY, FILMOD); 25568380Sgad if (fd < 0) { 25668380Sgad frecverr("%s: readfile: error on open(%s): %m", 25768380Sgad pp->printer, file); 25868380Sgad /*NOTREACHED*/ 25968380Sgad } 2601553Srgrimes ack(); 2611553Srgrimes err = 0; 2621553Srgrimes for (i = 0; i < size; i += BUFSIZ) { 2631553Srgrimes amt = BUFSIZ; 2641553Srgrimes cp = buf; 2651553Srgrimes if (i + amt > size) 2661553Srgrimes amt = size - i; 2671553Srgrimes do { 2681553Srgrimes j = read(1, cp, amt); 26968380Sgad if (j <= 0) { 27068380Sgad frecverr("%s: lost connection", pp->printer); 27168380Sgad /*NOTREACHED*/ 27268380Sgad } 2731553Srgrimes amt -= j; 2741553Srgrimes cp += j; 2751553Srgrimes } while (amt > 0); 2761553Srgrimes amt = BUFSIZ; 2771553Srgrimes if (i + amt > size) 2781553Srgrimes amt = size - i; 2791553Srgrimes if (write(fd, buf, amt) != amt) { 2801553Srgrimes err++; 2811553Srgrimes break; 2821553Srgrimes } 2831553Srgrimes } 2841553Srgrimes (void) close(fd); 28568380Sgad if (err) { 28668380Sgad frecverr("%s: write error on close(%s)", pp->printer, file); 28768380Sgad /*NOTREACHED*/ 28868380Sgad } 2891553Srgrimes if (noresponse()) { /* file sent had bad data in it */ 29030143Simp if (strchr(file, '/') == NULL) 29130143Simp (void) unlink(file); 29268380Sgad return (0); 2931553Srgrimes } 2941553Srgrimes ack(); 29568380Sgad return (1); 2961553Srgrimes} 2971553Srgrimes 2981553Srgrimesstatic int 29978146Sgadnoresponse(void) 3001553Srgrimes{ 3011553Srgrimes char resp; 3021553Srgrimes 30368380Sgad if (read(1, &resp, 1) != 1) { 30468380Sgad frecverr("lost connection in noresponse()"); 30568380Sgad /*NOTREACHED*/ 30668380Sgad } 3071553Srgrimes if (resp == '\0') 3081553Srgrimes return(0); 3091553Srgrimes return(1); 3101553Srgrimes} 3111553Srgrimes 3121553Srgrimes/* 3131553Srgrimes * Check to see if there is enough space on the disk for size bytes. 3141553Srgrimes * 1 == OK, 0 == Not OK. 3151553Srgrimes */ 3161553Srgrimesstatic int 31778146Sgadchksize(int size) 3181553Srgrimes{ 3191553Srgrimes int spacefree; 3201553Srgrimes struct statfs sfb; 3211553Srgrimes 3221553Srgrimes if (statfs(".", &sfb) < 0) { 3231553Srgrimes syslog(LOG_ERR, "%s: %m", "statfs(\".\")"); 3241553Srgrimes return (1); 3251553Srgrimes } 3261553Srgrimes spacefree = sfb.f_bavail * (sfb.f_bsize / 512); 3271553Srgrimes size = (size + 511) / 512; 3281553Srgrimes if (minfree + size > spacefree) 3291553Srgrimes return(0); 3301553Srgrimes return(1); 3311553Srgrimes} 3321553Srgrimes 3331553Srgrimesstatic int 33478146Sgadread_number(const char *fn) 3351553Srgrimes{ 3361553Srgrimes char lin[80]; 3371553Srgrimes register FILE *fp; 3381553Srgrimes 3391553Srgrimes if ((fp = fopen(fn, "r")) == NULL) 3401553Srgrimes return (0); 3411553Srgrimes if (fgets(lin, 80, fp) == NULL) { 3421553Srgrimes fclose(fp); 3431553Srgrimes return (0); 3441553Srgrimes } 3451553Srgrimes fclose(fp); 3461553Srgrimes return (atoi(lin)); 3471553Srgrimes} 3481553Srgrimes 3491553Srgrimes/* 3501553Srgrimes * Remove all the files associated with the current job being transfered. 3511553Srgrimes */ 3521553Srgrimesstatic void 35378146Sgadrcleanup(int signo __unused) 3541553Srgrimes{ 35530143Simp if (tfname[0] && strchr(tfname, '/') == NULL) 3561553Srgrimes (void) unlink(tfname); 35730143Simp if (dfname[0] && strchr(dfname, '/') == NULL) { 3581553Srgrimes do { 3591553Srgrimes do 3601553Srgrimes (void) unlink(dfname); 3611553Srgrimes while (dfname[2]-- != 'A'); 3621553Srgrimes dfname[2] = 'z'; 3631553Srgrimes } while (dfname[0]-- != 'd'); 36430143Simp } 3651553Srgrimes dfname[0] = '\0'; 3661553Srgrimes} 3671553Srgrimes 36827757Simp#ifdef __STDC__ 3691553Srgrimes#include <stdarg.h> 3701553Srgrimes#else 3711553Srgrimes#include <varargs.h> 3721553Srgrimes#endif 3731553Srgrimes 3741553Srgrimesstatic void 37527757Simp#ifdef __STDC__ 3761553Srgrimesfrecverr(const char *msg, ...) 3771553Srgrimes#else 3781553Srgrimesfrecverr(msg, va_alist) 3791553Srgrimes char *msg; 3801553Srgrimes va_dcl 3811553Srgrimes#endif 3821553Srgrimes{ 3831553Srgrimes va_list ap; 38427757Simp#ifdef __STDC__ 3851553Srgrimes va_start(ap, msg); 3861553Srgrimes#else 3871553Srgrimes va_start(ap); 3881553Srgrimes#endif 38968340Sgad syslog(LOG_ERR, "Error receiving job from %s:", fromb); 3901553Srgrimes vsyslog(LOG_ERR, msg, ap); 3911553Srgrimes va_end(ap); 39268340Sgad /* 39368735Sgad * rcleanup is not called until AFTER logging the error message, 39468735Sgad * because rcleanup will zap some variables which may have been 39568735Sgad * supplied as parameters for that msg... 39668340Sgad */ 39768340Sgad rcleanup(0); 39868340Sgad /* 39968340Sgad * Add a minimal delay before returning the final error code to 40068340Sgad * the sending host. This just in case that machine responds 40168340Sgad * this error by INSTANTLY retrying (and instantly re-failing...). 40268340Sgad * It would be stupid of the sending host to do that, but if there 40368340Sgad * was a broken implementation which did it, the result might be 40468340Sgad * obscure performance problems and a flood of syslog messages on 40568340Sgad * the receiving host. 40668340Sgad */ 40768340Sgad sleep(2); /* a paranoid throttling measure */ 4081553Srgrimes putchar('\1'); /* return error code */ 4091553Srgrimes exit(1); 4101553Srgrimes} 411