recvjob.c revision 68735 
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  "$FreeBSD: head/usr.sbin/lpr/lpd/recvjob.c 68735 2000-11-14 22:08:52Z gad $";
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((struct printer *pp, 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;
145	register char *cp;
146	int cfcnt, dfcnt;
147	char givenid[32], givenhost[MAXHOSTNAMELEN];
148
149	ack();
150	cfcnt = 0;
151	dfcnt = 0;
152	for (;;) {
153		/*
154		 * Read a command to tell us what to do
155		 */
156		cp = line;
157		do {
158			if ((size = read(1, cp, 1)) != 1) {
159				if (size < 0) {
160					frecverr("%s: lost connection",
161					    pp->printer);
162					/*NOTREACHED*/
163				}
164				return (cfcnt);
165			}
166		} while (*cp++ != '\n' && (cp - line + 1) < sizeof(line));
167		if (cp - line + 1 >= sizeof(line)) {
168			frecverr("%s: readjob overflow", pp->printer);
169			/*NOTREACHED*/
170		}
171		*--cp = '\0';
172		cp = line;
173		switch (*cp++) {
174		case '\1':	/* cleanup because data sent was bad */
175			rcleanup(0);
176			continue;
177
178		case '\2':	/* read cf file */
179			size = 0;
180			dfcnt = 0;
181			while (*cp >= '0' && *cp <= '9')
182				size = size * 10 + (*cp++ - '0');
183			if (*cp++ != ' ')
184				break;
185			/*
186			 * host name has been authenticated, we use our
187			 * view of the host name since we may be passed
188			 * something different than what gethostbyaddr()
189			 * returns
190			 */
191			strncpy(cp + 6, from, sizeof(line) + line - cp - 7);
192			line[sizeof(line) - 1 ] = '\0';
193			strncpy(tfname, cp, sizeof(tfname) - 1);
194			tfname[sizeof (tfname) - 1] = '\0';
195			tfname[0] = 't';
196			if (strchr(tfname, '/'))
197				frecverr("readjob: %s: illegal path name",
198				    tfname);
199			if (!chksize(size)) {
200				(void) write(1, "\2", 1);
201				continue;
202			}
203			if (!readfile(pp, tfname, size)) {
204				rcleanup(0);
205				continue;
206			}
207			if (link(tfname, cp) < 0)
208				frecverr("%s: %m", tfname);
209			(void) unlink(tfname);
210			tfname[0] = '\0';
211			cfcnt++;
212			continue;
213
214		case '\3':	/* read df file */
215			*givenid = '\0';
216			*givenhost = '\0';
217			size = 0;
218			while (*cp >= '0' && *cp <= '9')
219				size = size * 10 + (*cp++ - '0');
220			if (*cp++ != ' ')
221				break;
222			if (!chksize(size)) {
223				(void) write(1, "\2", 1);
224				continue;
225			}
226			(void) strncpy(dfname, cp, sizeof(dfname) - 1);
227			dfname[sizeof(dfname) - 1] = '\0';
228			if (strchr(dfname, '/')) {
229				frecverr("readjob: %s: illegal path name",
230					dfname);
231				/*NOTREACHED*/
232			}
233			dfcnt++;
234			trstat_init(pp, dfname, dfcnt);
235			(void) readfile(pp, dfname, size);
236			trstat_write(pp, TR_RECVING, size, givenid, from,
237				     givenhost);
238			continue;
239		}
240		frecverr("protocol screwup: %s", line);
241		/*NOTREACHED*/
242	}
243}
244
245/*
246 * Read files send by lpd and copy them to the spooling directory.
247 */
248static int
249readfile(pp, file, size)
250	struct printer *pp;
251	char *file;
252	int size;
253{
254	register char *cp;
255	char buf[BUFSIZ];
256	register int i, j, amt;
257	int fd, err;
258
259	fd = open(file, O_CREAT|O_EXCL|O_WRONLY, FILMOD);
260	if (fd < 0) {
261		frecverr("%s: readfile: error on open(%s): %m",
262			 pp->printer, file);
263		/*NOTREACHED*/
264	}
265	ack();
266	err = 0;
267	for (i = 0; i < size; i += BUFSIZ) {
268		amt = BUFSIZ;
269		cp = buf;
270		if (i + amt > size)
271			amt = size - i;
272		do {
273			j = read(1, cp, amt);
274			if (j <= 0) {
275				frecverr("%s: lost connection", pp->printer);
276				/*NOTREACHED*/
277			}
278			amt -= j;
279			cp += j;
280		} while (amt > 0);
281		amt = BUFSIZ;
282		if (i + amt > size)
283			amt = size - i;
284		if (write(fd, buf, amt) != amt) {
285			err++;
286			break;
287		}
288	}
289	(void) close(fd);
290	if (err) {
291		frecverr("%s: write error on close(%s)", pp->printer, file);
292		/*NOTREACHED*/
293	}
294	if (noresponse()) {		/* file sent had bad data in it */
295		if (strchr(file, '/') == NULL)
296			(void) unlink(file);
297		return (0);
298	}
299	ack();
300	return (1);
301}
302
303static int
304noresponse()
305{
306	char resp;
307
308	if (read(1, &resp, 1) != 1) {
309		frecverr("lost connection in noresponse()");
310		/*NOTREACHED*/
311	}
312	if (resp == '\0')
313		return(0);
314	return(1);
315}
316
317/*
318 * Check to see if there is enough space on the disk for size bytes.
319 * 1 == OK, 0 == Not OK.
320 */
321static int
322chksize(size)
323	int size;
324{
325	int spacefree;
326	struct statfs sfb;
327
328	if (statfs(".", &sfb) < 0) {
329		syslog(LOG_ERR, "%s: %m", "statfs(\".\")");
330		return (1);
331	}
332	spacefree = sfb.f_bavail * (sfb.f_bsize / 512);
333	size = (size + 511) / 512;
334	if (minfree + size > spacefree)
335		return(0);
336	return(1);
337}
338
339static int
340read_number(fn)
341	char *fn;
342{
343	char lin[80];
344	register FILE *fp;
345
346	if ((fp = fopen(fn, "r")) == NULL)
347		return (0);
348	if (fgets(lin, 80, fp) == NULL) {
349		fclose(fp);
350		return (0);
351	}
352	fclose(fp);
353	return (atoi(lin));
354}
355
356/*
357 * Remove all the files associated with the current job being transfered.
358 */
359static void
360rcleanup(signo)
361	int signo;
362{
363	if (tfname[0] && strchr(tfname, '/') == NULL)
364		(void) unlink(tfname);
365	if (dfname[0] && strchr(dfname, '/') == NULL) {
366		do {
367			do
368				(void) unlink(dfname);
369			while (dfname[2]-- != 'A');
370			dfname[2] = 'z';
371		} while (dfname[0]-- != 'd');
372	}
373	dfname[0] = '\0';
374}
375
376#ifdef __STDC__
377#include <stdarg.h>
378#else
379#include <varargs.h>
380#endif
381
382static void
383#ifdef __STDC__
384frecverr(const char *msg, ...)
385#else
386frecverr(msg, va_alist)
387	char *msg;
388        va_dcl
389#endif
390{
391	va_list ap;
392#ifdef __STDC__
393	va_start(ap, msg);
394#else
395	va_start(ap);
396#endif
397	syslog(LOG_ERR, "Error receiving job from %s:", fromb);
398	vsyslog(LOG_ERR, msg, ap);
399	va_end(ap);
400	/*
401	 * rcleanup is not called until AFTER logging the error message,
402	 * because rcleanup will zap some variables which may have been
403	 * supplied as parameters for that msg...
404	 */
405	rcleanup(0);
406	/*
407	 * Add a minimal delay before returning the final error code to
408	 * the sending host.  This just in case that machine responds
409	 * this error by INSTANTLY retrying (and instantly re-failing...).
410	 * It would be stupid of the sending host to do that, but if there
411	 * was a broken implementation which did it, the result might be
412	 * obscure performance problems and a flood of syslog messages on
413	 * the receiving host.
414	 */
415	sleep(2);		/* a paranoid throttling measure */
416	putchar('\1');		/* return error code */
417	exit(1);
418}
419