4.3BSD-UWisc/src/usr.lib/lpr/lpr.c
/*
* Copyright (c) 1983 Regents of the University of California.
* All rights reserved. The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*/
#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1983 Regents of the University of California.\n\
All rights reserved.\n";
#endif not lint
#ifndef lint
static char sccsid[] = "@(#)lpr.c 5.2 (Berkeley) 11/17/85";
#endif not lint
/*
* lpr -- off line print
*
* Allows multiple printers and printers on remote machines by
* using information from a printer data base.
*/
#include <stdio.h>
#include <sys/types.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <pwd.h>
#include <grp.h>
#include <signal.h>
#include <ctype.h>
#include <syslog.h>
#include "lp.local.h"
char *tfname; /* tmp copy of cf before linking */
char *cfname; /* daemon control files, linked from tf's */
char *dfname; /* data files */
int nact; /* number of jobs to act on */
int tfd; /* control file descriptor */
int mailflg; /* send mail */
int qflag; /* q job, but don't exec daemon */
char format = 'f'; /* format char for printing files */
int rflag; /* remove files upon completion */
int sflag; /* symbolic link flag */
int inchar; /* location to increment char in file names */
int ncopies = 1; /* # of copies to make */
int iflag; /* indentation wanted */
int indent; /* amount to indent */
int hdr = 1; /* print header or not (default is yes) */
int userid; /* user id */
char *person; /* user name */
char *title; /* pr'ing title */
char *fonts[4]; /* troff font names */
char *width; /* width for versatec printing */
char host[32]; /* host name */
char *class = host; /* class title on header page */
char *jobname; /* job name on header page */
char *name; /* program name */
char *printer; /* printer name */
struct stat statb;
int MX; /* maximum number of blocks to copy */
int MC; /* maximum number of copies allowed */
int DU; /* daemon user-id */
char *SD; /* spool directory */
char *LO; /* lock file name */
char *RG; /* restrict group */
short SC; /* suppress multiple copies */
char *getenv();
char *rindex();
char *linked();
int cleanup();
/*ARGSUSED*/
main(argc, argv)
int argc;
char *argv[];
{
extern struct passwd *getpwuid();
struct passwd *pw;
struct group *gptr;
extern char *itoa();
register char *arg, *cp;
char buf[BUFSIZ];
int i, f;
struct stat stb;
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);
name = argv[0];
gethostname(host, sizeof (host));
openlog("lpd", 0, LOG_LPR);
while (argc > 1 && argv[1][0] == '-') {
argc--;
arg = *++argv;
switch (arg[1]) {
case 'P': /* specifiy printer name */
if (arg[2])
printer = &arg[2];
else if (argc > 1) {
argc--;
printer = *++argv;
}
break;
case 'C': /* classification spec */
hdr++;
if (arg[2])
class = &arg[2];
else if (argc > 1) {
argc--;
class = *++argv;
}
break;
case 'J': /* job name */
hdr++;
if (arg[2])
jobname = &arg[2];
else if (argc > 1) {
argc--;
jobname = *++argv;
}
break;
case 'T': /* pr's title line */
if (arg[2])
title = &arg[2];
else if (argc > 1) {
argc--;
title = *++argv;
}
break;
case 'l': /* literal output */
case 'p': /* print using ``pr'' */
case 't': /* print troff output (cat files) */
case 'n': /* print ditroff output */
case 'd': /* print tex output (dvi files) */
case 'g': /* print graph(1G) output */
case 'c': /* print cifplot output */
case 'v': /* print vplot output */
format = arg[1];
break;
case 'f': /* print fortran output */
format = 'r';
break;
case '4': /* troff fonts */
case '3':
case '2':
case '1':
if (argc > 1) {
argc--;
fonts[arg[1] - '1'] = *++argv;
}
break;
case 'w': /* versatec page width */
width = arg+2;
break;
case 'r': /* remove file when done */
rflag++;
break;
case 'm': /* send mail when done */
mailflg++;
break;
case 'h': /* toggle want of header page */
hdr = !hdr;
break;
case 's': /* try to link files */
sflag++;
break;
case 'q': /* just q job */
qflag++;
break;
case 'i': /* indent output */
iflag++;
indent = arg[2] ? atoi(&arg[2]) : 8;
break;
case '#': /* n copies */
if (isdigit(arg[2])) {
i = atoi(&arg[2]);
if (i > 0)
ncopies = i;
}
}
}
if (printer == NULL && (printer = getenv("PRINTER")) == NULL)
printer = DEFLP;
chkprinter(printer);
if (SC && ncopies > 1)
fatal("multiple copies are not allowed");
if (MC > 0 && ncopies > MC)
fatal("only %d copies are allowed", MC);
/*
* Get the identity of the person doing the lpr using the same
* algorithm as lprm.
*/
userid = getuid();
if ((pw = getpwuid(userid)) == NULL)
fatal("Who are you?");
person = pw->pw_name;
/*
* Check for restricted group access.
*/
if (RG != NULL) {
if ((gptr = getgrnam(RG)) == NULL)
fatal("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)
fatal("Not a member of the restricted group");
}
}
/*
* Check to make sure queuing is enabled if userid is not root.
*/
(void) sprintf(buf, "%s/%s", SD, LO);
if (userid && stat(buf, &stb) == 0 && (stb.st_mode & 010))
fatal("Printer queue is disabled");
/*
* Initialize the control file.
*/
mktemps();
tfd = nfile(tfname);
(void) fchown(tfd, DU, -1); /* owned by daemon for protection */
card('H', host);
card('P', person);
if (hdr) {
if (jobname == NULL) {
if (argc == 1)
jobname = "stdin";
else
jobname = (arg = rindex(argv[1], '/')) ? arg+1 : argv[1];
}
card('J', jobname);
card('C', class);
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 == 1)
copy(0, " ");
else while (--argc) {
if ((f = test(arg = *++argv)) < 0)
continue; /* file unreasonable */
if (sflag && (cp = linked(arg)) != NULL) {
(void) sprintf(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)
printf("%s: %s: not linked, copying instead\n", name, arg);
if ((i = open(arg, O_RDONLY)) < 0) {
printf("%s: cannot open %s\n", name, arg);
continue;
}
copy(i, arg);
(void) close(i);
if (f && unlink(arg) < 0)
printf("%s: %s: not removed\n", name, arg);
}
if (nact) {
(void) close(tfd);
tfname[inchar]--;
/*
* Touch the control file to fix position in the queue.
*/
if ((tfd = open(tfname, O_RDWR)) >= 0) {
char c;
if (read(tfd, &c, 1) == 1 && lseek(tfd, 0L, 0) == 0 &&
write(tfd, &c, 1) != 1) {
printf("%s: cannot touch %s\n", name, tfname);
tfname[inchar]++;
cleanup();
}
(void) close(tfd);
}
if (link(tfname, cfname) < 0) {
printf("%s: cannot rename %s\n", name, cfname);
tfname[inchar]++;
cleanup();
}
unlink(tfname);
if (qflag) /* just q things up */
exit(0);
if (!startdaemon(printer))
printf("jobs queued, but cannot start daemon.\n");
exit(0);
}
cleanup();
/* NOTREACHED */
}
/*
* Create the file n and copy from file descriptor f.
*/
copy(f, n)
int f;
char n[];
{
register 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, BUFSIZ)) > 0) {
if (write(fd, buf, i) != i) {
printf("%s: %s: temp file write error\n", name, n);
break;
}
nc += i;
if (nc >= BUFSIZ) {
nc -= BUFSIZ;
nr++;
if (MX > 0 && nr > MX) {
printf("%s: %s: copy file is too large\n", name, n);
break;
}
}
}
(void) close(fd);
if (nc==0 && nr==0)
printf("%s: %s: empty input file\n", name, f ? n : "stdin");
else
nact++;
}
/*
* Try and link the file to dfname. Return a pointer to the full
* path name if successful.
*/
char *
linked(file)
register char *file;
{
register char *cp;
static char buf[BUFSIZ];
if (*file != '/') {
if (getwd(buf) == NULL)
return(NULL);
while (file[0] == '.') {
switch (file[1]) {
case '/':
file += 2;
continue;
case '.':
if (file[2] == '/') {
if ((cp = rindex(buf, '/')) != NULL)
*cp = '\0';
file += 3;
continue;
}
}
break;
}
strcat(buf, "/");
strcat(buf, file);
file = buf;
}
return(symlink(file, dfname) ? NULL : file);
}
/*
* Put a line into the control file.
*/
card(c, p2)
register char c, *p2;
{
char buf[BUFSIZ];
register char *p1 = buf;
register int len = 2;
*p1++ = c;
while ((c = *p2++) != '\0') {
*p1++ = c;
len++;
}
*p1++ = '\n';
write(tfd, buf, len);
}
/*
* Create a new file in the spool directory.
*/
nfile(n)
char *n;
{
register f;
int oldumask = umask(0); /* should block signals */
f = creat(n, FILMOD);
(void) umask(oldumask);
if (f < 0) {
printf("%s: cannot create %s\n", name, n);
cleanup();
}
if (fchown(f, userid, -1) < 0) {
printf("%s: cannot chown %s\n", name, n);
cleanup();
}
if (++n[inchar] > 'z') {
if (++n[inchar-2] == 't') {
printf("too many files - break up the job\n");
cleanup();
}
n[inchar] = 'A';
} else if (n[inchar] == '[')
n[inchar] = 'a';
return(f);
}
/*
* Cleanup after interrupts and errors.
*/
cleanup()
{
register i;
signal(SIGHUP, SIG_IGN);
signal(SIGINT, SIG_IGN);
signal(SIGQUIT, SIG_IGN);
signal(SIGTERM, SIG_IGN);
i = inchar;
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.
*/
test(file)
char *file;
{
struct exec execb;
register int fd;
register char *cp;
if (access(file, 4) < 0) {
printf("%s: cannot access %s\n", name, file);
return(-1);
}
if (stat(file, &statb) < 0) {
printf("%s: cannot stat %s\n", name, file);
return(-1);
}
if ((statb.st_mode & S_IFMT) == S_IFDIR) {
printf("%s: %s is a directory\n", name, file);
return(-1);
}
if (statb.st_size == 0) {
printf("%s: %s is an empty file\n", name, file);
return(-1);
}
if ((fd = open(file, O_RDONLY)) < 0) {
printf("%s: cannot open %s\n", name, file);
return(-1);
}
if (read(fd, &execb, sizeof(execb)) == sizeof(execb))
switch(execb.a_magic) {
case A_MAGIC1:
case A_MAGIC2:
case A_MAGIC3:
#ifdef A_MAGIC4
case A_MAGIC4:
#endif
printf("%s: %s is an executable program", name, file);
goto error1;
case ARMAG:
printf("%s: %s is an archive file", name, file);
goto error1;
}
(void) close(fd);
if (rflag) {
if ((cp = rindex(file, '/')) == NULL) {
if (access(".", 2) == 0)
return(1);
} else {
*cp = '\0';
fd = access(file, 2);
*cp = '/';
if (fd == 0)
return(1);
}
printf("%s: %s: is not removable by you\n", name, file);
}
return(0);
error1:
printf(" and is unprintable\n");
(void) close(fd);
return(-1);
}
/*
* itoa - integer to string conversion
*/
char *
itoa(i)
register int i;
{
static char b[10] = "########";
register char *p;
p = &b[8];
do
*p-- = i%10 + '0';
while (i /= 10);
return(++p);
}
/*
* Perform lookup for printer name or abbreviation --
*/
chkprinter(s)
char *s;
{
int status;
char buf[BUFSIZ];
static char pbuf[BUFSIZ/2];
char *bp = pbuf;
extern char *pgetstr();
if ((status = pgetent(buf, s)) < 0)
fatal("cannot open printer description file");
else if (status == 0)
fatal("%s: unknown printer", s);
if ((SD = pgetstr("sd", &bp)) == NULL)
SD = DEFSPOOL;
if ((LO = pgetstr("lo", &bp)) == NULL)
LO = DEFLOCK;
RG = pgetstr("rg", &bp);
if ((MX = pgetnum("mx")) < 0)
MX = DEFMX;
if ((MC = pgetnum("mc")) < 0)
MC = DEFMAXCOPIES;
if ((DU = pgetnum("du")) < 0)
DU = DEFUID;
SC = pgetflag("sc");
}
/*
* Make the temp files.
*/
mktemps()
{
register int c, len, fd, n;
register char *cp;
char buf[BUFSIZ];
char *mktemp();
(void) sprintf(buf, "%s/.seq", SD);
if ((fd = open(buf, O_RDWR|O_CREAT, 0661)) < 0) {
printf("%s: cannot create %s\n", name, buf);
exit(1);
}
if (flock(fd, LOCK_EX)) {
printf("%s: cannot lock %s\n", name, buf);
exit(1);
}
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');
}
}
len = strlen(SD) + strlen(host) + 8;
tfname = mktemp("tf", n, len);
cfname = mktemp("cf", n, len);
dfname = mktemp("df", n, len);
inchar = strlen(SD) + 3;
n = (n + 1) % 1000;
(void) lseek(fd, 0L, 0);
sprintf(buf, "%03d\n", n);
(void) write(fd, buf, strlen(buf));
(void) close(fd); /* unlocks as well */
}
/*
* Make a temp file name.
*/
char *
mktemp(id, num, len)
char *id;
int num, len;
{
register char *s;
extern char *malloc();
if ((s = malloc(len)) == NULL)
fatal("out of memory");
(void) sprintf(s, "%s/%sA%03d%s", SD, id, num, host);
return(s);
}
/*VARARGS1*/
fatal(msg, a1, a2, a3)
char *msg;
{
printf("%s: ", name);
printf(msg, a1, a2, a3);
putchar('\n');
exit(1);
}