OpenBSD-4.6/usr.sbin/lpr/lpr/lpr.c
/* $OpenBSD: lpr.c,v 1.41 2007/04/07 21:57:27 stevesk Exp $ */
/* $NetBSD: lpr.c,v 1.19 2000/10/11 20:23:52 is Exp $ */
/*
* Copyright (c) 1983, 1989, 1993
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1983, 1989, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static const char sccsid[] = "@(#)lpr.c 8.4 (Berkeley) 4/28/95";
#else
static const char rcsid[] = "$OpenBSD: lpr.c,v 1.41 2007/04/07 21:57:27 stevesk Exp $";
#endif
#endif /* not lint */
/*
* lpr -- off line print
*
* Allows multiple printers and printers on remote machines by
* using information from a printer data base.
*/
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <syslog.h>
#include <pwd.h>
#include <grp.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <err.h>
#include "lp.h"
#include "lp.local.h"
#include "pathnames.h"
static char *cfname; /* daemon control files, linked from tf's */
static char *class = host; /* class title on header page */
static char *dfname; /* data files */
static char *fonts[4]; /* troff font names */
static char format = 'f'; /* format char for printing files */
static int hdr = 1; /* print header or not (default is yes) */
static int iflag; /* indentation wanted */
static int inchar; /* location to increment char in file names */
static int indent; /* amount to indent */
static char *jobname; /* job name on header page */
static int mailflg; /* send mail */
static int nact; /* number of jobs to act on */
static int ncopies = 1; /* # of copies to make */
static const char *person; /* user name */
static int qflag; /* q job, but don't exec daemon */
static int rflag; /* remove files upon completion */
static int sflag; /* symbolic link flag */
static int tfd; /* control file descriptor */
static char *tfname; /* tmp copy of cf before linking */
static char *title; /* pr'ing title */
static char *width; /* width for versatec printing */
static struct stat statb;
volatile sig_atomic_t gotintr;
static void card(int, const char *);
static void chkprinter(char *);
static void cleanup(int);
static void copy(int, char *);
static char *itoa(int);
static char *linked(char *);
static char *lmktemp(char *, int);
static void mktemps(void);
static int nfile(char *);
static int test(char *);
static __dead void usage(void);
int
main(int argc, char **argv)
{
struct passwd *pw;
struct group *gptr;
char *arg, *cp;
char buf[MAXPATHLEN];
int i, f, ch;
struct stat stb;
/*
* Simulate setuid daemon w/ PRIV_END called.
* We don't want lpr to actually be setuid daemon since that
* requires that the lpr binary be owned by user daemon, which
* is potentially unsafe.
*/
if ((pw = getpwuid(DEFUID)) == NULL)
errx(1, "daemon uid (%u) not in password file", DEFUID);
effective_uid = pw->pw_uid;
real_uid = getuid();
effective_gid = pw->pw_gid;
real_gid = getgid();
setresgid(real_gid, real_gid, effective_gid);
setresuid(real_uid, real_uid, effective_uid);
if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
signal(SIGHUP, cleanup);
if (signal(SIGINT, SIG_IGN) != SIG_IGN)
signal(SIGINT, cleanup);
if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
signal(SIGQUIT, cleanup);
if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
signal(SIGTERM, cleanup);
gethostname(host, sizeof (host));
openlog("lpr", 0, LOG_LPR);
while ((ch = getopt(argc, argv,
":#:1:2:3:4:C:J:P:T:U:cdfghi:lmnpqrstvw:")) != -1) {
switch (ch) {
case '#': /* n copies */
if (isdigit(*optarg)) {
i = atoi(optarg);
if (i > 0)
ncopies = i;
}
case '4': /* troff fonts */
case '3':
case '2':
case '1':
fonts[ch - '1'] = optarg;
break;
case 'C': /* classification spec */
hdr++;
class = optarg;
break;
case 'J': /* job name */
hdr++;
jobname = optarg;
break;
case 'P': /* specifiy printer name */
printer = optarg;
break;
case 'T': /* pr's title line */
title = optarg;
break;
case 'U': /* user name */
hdr++;
person = optarg;
break;
case 'c': /* print cifplot output */
case 'd': /* print tex output (dvi files) */
case 'g': /* print graph(1G) output */
case 'l': /* literal output */
case 'n': /* print ditroff output */
case 'p': /* print using ``pr'' */
case 't': /* print troff output (cat files) */
case 'v': /* print vplot output */
format = ch;
break;
case 'f': /* print fortran output */
format = 'r';
break;
case 'h': /* toggle want of header page */
hdr = !hdr;
break;
case 'i': /* indent output */
iflag++;
indent = atoi(optarg);
if (indent < 0)
indent = 8;
break;
case 'm': /* send mail when done */
mailflg++;
break;
case 'q': /* just q job */
qflag++;
break;
case 'r': /* remove file when done */
rflag++;
break;
case 's': /* try to link files */
sflag++;
break;
case 'w': /* versatec page width */
width = optarg;
break;
case ':': /* catch "missing argument" error */
if (optopt == 'i') {
iflag++; /* -i without args is valid */
indent = 8;
} else
usage();
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
if (printer == NULL && (printer = getenv("PRINTER")) == NULL)
printer = DEFLP;
chkprinter(printer);
if (SC && ncopies > 1)
errx(1, "multiple copies are not allowed");
if (MC > 0 && ncopies > MC)
errx(1, "only %ld copies are allowed", MC);
/*
* Get the identity of the person doing the lpr using the same
* algorithm as lprm.
*/
if (real_uid != DU || person == NULL) {
if ((pw = getpwuid(real_uid)) == NULL)
errx(1, "Who are you?");
if ((person = strdup(pw->pw_name)) == NULL)
err(1, NULL);
}
/*
* Check for restricted group access.
*/
if (RG != NULL && real_uid != DU) {
if ((gptr = getgrnam(RG)) == NULL)
errx(1, "Restricted group specified incorrectly");
if (gptr->gr_gid != getgid()) {
while (*gptr->gr_mem != NULL) {
if ((strcmp(person, *gptr->gr_mem)) == 0)
break;
gptr->gr_mem++;
}
if (*gptr->gr_mem == NULL)
errx(1, "Not a member of the restricted group");
}
}
/*
* Check to make sure queuing is enabled if real_uid is not root.
*/
(void)snprintf(buf, sizeof(buf), "%s/%s", SD, LO);
if (real_uid && stat(buf, &stb) == 0 && (stb.st_mode & 010))
errx(1, "Printer queue is disabled");
/*
* Initialize the control file.
*/
mktemps();
tfd = nfile(tfname);
card('H', host);
card('P', person);
if (hdr) {
if (jobname == NULL) {
if (argc == 0)
jobname = "stdin";
else
jobname = (arg = strrchr(argv[0], '/')) ?
arg + 1 : argv[0];
}
card('J', jobname);
card('C', class);
if (!SH)
card('L', person);
}
if (iflag)
card('I', itoa(indent));
if (mailflg)
card('M', person);
if (format == 't' || format == 'n' || format == 'd')
for (i = 0; i < 4; i++)
if (fonts[i] != NULL)
card('1'+i, fonts[i]);
if (width != NULL)
card('W', width);
/*
* Read the files and spool them.
*/
if (argc == 0)
copy(0, " ");
else while (argc--) {
if (argv[0][0] == '-' && argv[0][1] == '\0') {
/* use stdin */
copy(0, " ");
argv++;
continue;
}
if ((f = test(arg = *argv++)) < 0)
continue; /* file unreasonable */
if (sflag && (cp = linked(arg)) != NULL) {
(void)snprintf(buf, sizeof(buf), "%d %d",
statb.st_dev, statb.st_ino);
card('S', buf);
if (format == 'p')
card('T', title ? title : arg);
for (i = 0; i < ncopies; i++)
card(format, &dfname[inchar-2]);
card('U', &dfname[inchar-2]);
if (f)
card('U', cp);
card('N', arg);
dfname[inchar]++;
nact++;
continue;
}
if (sflag)
warnx("%s: not linked, copying instead", arg);
if ((i = safe_open(arg, O_RDONLY, 0)) < 0)
warn("%s", arg);
else {
copy(i, arg);
(void)close(i);
if (f && unlink(arg) < 0)
warnx("%s: not removed", arg);
}
}
if (nact) {
(void)close(tfd);
tfname[inchar]--;
/*
* Touch the control file to fix position in the queue.
*/
PRIV_START;
if ((tfd = safe_open(tfname, O_RDWR|O_NOFOLLOW, 0)) >= 0) {
char c;
if (read(tfd, &c, 1) == 1 &&
lseek(tfd, (off_t)0, SEEK_SET) == 0 &&
write(tfd, &c, 1) != 1) {
warn("%s", tfname);
tfname[inchar]++;
cleanup(0);
}
(void)close(tfd);
}
if (link(tfname, cfname) < 0) {
warn("cannot rename %s", cfname);
tfname[inchar]++;
cleanup(0);
}
unlink(tfname);
PRIV_END;
if (qflag) /* just q things up */
exit(0);
if (!startdaemon(printer))
printf("jobs queued, but cannot start daemon.\n");
exit(0);
}
cleanup(0);
return (1);
/* NOTREACHED */
}
/*
* Create the file n and copy from file descriptor f.
*/
static void
copy(int f, char *n)
{
int fd, i, nr, nc;
char buf[BUFSIZ];
if (format == 'p')
card('T', title ? title : n);
for (i = 0; i < ncopies; i++)
card(format, &dfname[inchar-2]);
card('U', &dfname[inchar-2]);
card('N', n);
fd = nfile(dfname);
nr = nc = 0;
while ((i = read(f, buf, sizeof(buf))) > 0) {
if (write(fd, buf, i) != i) {
warn("%s", n);
break;
}
nc += i;
if (nc >= sizeof(buf)) {
nc -= sizeof(buf);
nr++;
if (MX > 0 && nr > MX) {
warnx("%s: copy file is too large", n);
break;
}
}
}
(void)close(fd);
if (nc == 0 && nr == 0)
warnx("%s: empty input file", f ? n : "stdin");
else
nact++;
}
/*
* Try and link the file to dfname. Return a pointer to the full
* path name if successful.
*/
static char *
linked(char *file)
{
char *cp;
static char buf[MAXPATHLEN];
int ret;
if (*file != '/') {
if (getcwd(buf, sizeof(buf)) == NULL)
return(NULL);
while (file[0] == '.') {
switch (file[1]) {
case '/':
file += 2;
continue;
case '.':
if (file[2] == '/') {
if ((cp = strrchr(buf, '/')) != NULL)
*cp = '\0';
file += 3;
continue;
}
}
break;
}
if (strlcat(buf, "/", sizeof(buf)) >= sizeof(buf) ||
strlcat(buf, file, sizeof(buf)) >= sizeof(buf))
return(NULL);
file = buf;
}
PRIV_START;
ret = symlink(file, dfname);
PRIV_END;
return(ret ? NULL : file);
}
/*
* Put a line into the control file.
*/
static void
card(int c, const char *p2)
{
char buf[BUFSIZ];
char *p1 = buf;
int len = 2;
if (strlen(p2) > sizeof(buf) - 2)
errx(1, "Internal error: String longer than %ld",
(long)sizeof(buf));
*p1++ = c;
while ((c = *p2++) != '\0' && len < sizeof(buf)) {
*p1++ = (c == '\n') ? ' ' : c;
len++;
}
*p1++ = '\n';
write(tfd, buf, len);
}
/*
* Create a new file in the spool directory.
*/
static int
nfile(char *n)
{
int f;
int oldumask = umask(0); /* should block signals */
PRIV_START;
f = open(n, O_WRONLY|O_EXCL|O_CREAT, FILMOD);
(void)umask(oldumask);
if (f < 0) {
warn("%s", n);
cleanup(0);
}
PRIV_END;
if (++n[inchar] > 'z') {
if (++n[inchar-2] == 't') {
warnx("too many files - break up the job");
cleanup(0);
}
n[inchar] = 'A';
} else if (n[inchar] == '[')
n[inchar] = 'a';
return (f);
}
/*
* Cleanup after interrupts and errors.
*/
static void
cleanup(int signo)
{
int i;
signal(SIGHUP, SIG_IGN);
signal(SIGINT, SIG_IGN);
signal(SIGQUIT, SIG_IGN);
signal(SIGTERM, SIG_IGN);
i = inchar;
PRIV_START;
if (tfname)
do
unlink(tfname);
while (tfname[i]-- != 'A');
if (cfname)
do
unlink(cfname);
while (cfname[i]-- != 'A');
if (dfname)
do {
do
unlink(dfname);
while (dfname[i]-- != 'A');
dfname[i] = 'z';
} while (dfname[i-2]-- != 'd');
_exit(1);
}
/*
* Test to see if this is a printable file.
* Return -1 if it is not, 0 if its printable, and 1 if
* we should remove it after printing.
*/
static int
test(char *file)
{
int fd;
char *cp;
if ((fd = open(file, O_RDONLY|O_NONBLOCK)) < 0) {
warn("cannot open %s", file);
goto bad;
}
if (fstat(fd, &statb) < 0) {
warn("cannot stat %s", file);
goto bad;
}
if (S_ISDIR(statb.st_mode)) {
warnx("%s is a directory", file);
goto bad;
}
if (!S_ISREG(statb.st_mode)) {
warnx("%s is not a regular file", file);
goto bad;
}
if (statb.st_size == 0) {
warnx("%s is an empty file", file);
goto bad;
}
(void)close(fd);
if (rflag) {
if ((cp = strrchr(file, '/')) == NULL) {
if (access(".", 2) == 0)
return(1);
} else {
if (cp == file) {
fd = access("/", 2);
} else {
*cp = '\0';
fd = access(file, 2);
*cp = '/';
}
if (fd == 0)
return(1);
}
warnx("%s is not removable by you", file);
}
return(0);
bad:
return(-1);
}
/*
* itoa - integer to string conversion
*/
static char *
itoa(int i)
{
static char b[10] = "########";
char *p;
p = &b[8];
do
*p-- = i%10 + '0';
while (i /= 10)
;
return(++p);
}
/*
* Perform lookup for printer name or abbreviation --
*/
static void
chkprinter(char *s)
{
int status;
if ((status = cgetent(&bp, printcapdb, s)) == -2)
errx(1, "cannot open printer description file");
else if (status == -1)
errx(1, "%s: unknown printer", s);
if (cgetstr(bp, "sd", &SD) == -1)
SD = _PATH_DEFSPOOL;
if (cgetstr(bp, "lo", &LO) == -1)
LO = DEFLOCK;
cgetstr(bp, "rg", &RG);
if (cgetnum(bp, "mx", &MX) < 0)
MX = DEFMX;
if (cgetnum(bp, "mc", &MC) < 0)
MC = DEFMAXCOPIES;
if (cgetnum(bp, "du", &DU) < 0)
DU = DEFUID;
SC = (cgetcap(bp, "sc", ':') != NULL);
SH = (cgetcap(bp, "sh", ':') != NULL);
}
/*
* Make the temp files.
*/
static void
mktemps(void)
{
int len, fd, n;
char *cp;
char buf[BUFSIZ];
struct stat stb;
if (snprintf(buf, sizeof(buf), "%s/.seq", SD) >= sizeof(buf))
errx(1, "%s/.seq: %s", SD, strerror(ENAMETOOLONG));
PRIV_START;
if ((fd = safe_open(buf, O_RDWR|O_CREAT|O_NOFOLLOW, 0661)) < 0)
err(1, "cannot open %s", buf);
if (flock(fd, LOCK_EX))
err(1, "cannot lock %s", buf);
PRIV_END;
n = 0;
if ((len = read(fd, buf, sizeof(buf))) > 0) {
for (cp = buf; len--; ) {
if (*cp < '0' || *cp > '9')
break;
n = n * 10 + (*cp++ - '0');
}
}
do {
tfname = lmktemp("tf", n);
cfname = lmktemp("cf", n);
dfname = lmktemp("df", n);
n = (n + 1) % 1000;
} while (stat(tfname, &stb) == 0 || stat(cfname, &stb) == 0 ||
stat(dfname, &stb) == 0);
inchar = strlen(SD) + 3;
(void)lseek(fd, (off_t)0, SEEK_SET);
snprintf(buf, sizeof(buf), "%03d\n", n);
(void)write(fd, buf, strlen(buf));
(void)close(fd); /* unlocks as well */
}
/*
* Make a temp file name.
*/
static char *
lmktemp(char *id, int num)
{
char *s;
if (asprintf(&s, "%s/%sA%03d%s", SD, id, num, host) == -1)
err(1, NULL);
return(s);
}
static __dead void
usage(void)
{
extern char *__progname;
fprintf(stderr,
"usage: %s [-cdfghlmnpqrstv] [-#num] [-1234 font] "
"[-C class] [-i [numcols]]\n"
"\t[-J job] [-Pprinter] [-T title] [-U user] "
"[-wnum] [name ...]\n", __progname);
exit(1);
}