4.1cBSD/usr/src/usr.lib/lpr/lpr.c
/* lpr.c 4.10 83/03/09 */
/*
* lpr -- off line print
*
* Allows multiple printers and printers on remote machines by
* using information from a printer data base.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <signal.h>
#include <pwd.h>
#include <stdio.h>
#include <ctype.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 lflag; /* link flag */
char *person; /* user name */
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 */
char *DN; /* path name to daemon program */
char *LP; /* line printer device name */
char *RM; /* remote machine name if no local printer */
char *SD; /* spool directory */
int MX; /* maximum size in blocks of a print file */
int hdr = 1; /* print header or not (default is yes) */
int userid; /* user id */
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 *pgetstr();
char *malloc();
char *getenv();
char *rindex();
char *linked();
/*ARGSUSED*/
main(argc, argv)
int argc;
char *argv[];
{
extern char *getlogin();
extern struct passwd *getpwuid(), *getpwnam();
struct passwd *pw;
extern char *itoa();
register char *arg, *cp;
int i, f, out();
char *printer = NULL;
struct stat stb;
/*
* Strategy to maintain protected spooling area:
* 1. Spooling area is writable only by daemon and spooling group
* 2. lpr runs setuid root and setgrp spooling group; it uses
* root to access any file it wants (verifying things before
* with an access call) and group id to know how it should
* set up ownership of files in spooling area.
* 3. Files in spooling area are owned by daemon and spooling
* group, with mode 660.
* 4. lpd runs setuid root and setgrp spooling group to
* access files and printer. Users can't get to anything
* w/o help of lpq and lprm programs.
*/
if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
signal(SIGHUP, out);
if (signal(SIGINT, SIG_IGN) != SIG_IGN)
signal(SIGINT, out);
if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
signal(SIGQUIT, out);
if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
signal(SIGTERM, out);
gethostname(host, sizeof (host));
name = argv[0];
while (argc > 1 && (arg = argv[1])[0] == '-') {
argc--;
argv++;
switch (arg[1]) {
case 'P': /* specifiy printer name */
printer = &arg[2];
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 */
case 'c': /* print cifplot output */
case 'v': /* print vplot output */
format = arg[1];
break;
case '4': /* troff fonts */
case '3':
case '2':
case '1':
if (argc > 1) {
argc--;
fonts[arg[1] - '1'] = *++argv;
format = 't';
}
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 */
lflag++;
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]))
ncopies = atoi(&arg[2]);
}
}
if (printer == NULL && (printer = getenv("PRINTER")) == NULL)
printer = DEFLP;
if (!chkprinter(printer)) {
printf("%s: unknown printer %s\n", name, printer);
exit(2);
}
/*
* Get the identity of the person doing the lpr and initialize the
* control file.
*/
userid = getuid();
if ((person = getlogin()) == NULL || strlen(person) == 0) {
if ((pw = getpwuid(userid)) == NULL)
person = "Unknown User";
else
person = pw->pw_name;
} else if ((pw = getpwnam(person)) != NULL)
userid = pw->pw_uid; /* in case of su */
mktemps();
tfd = nfile(tfname);
card('H', host);
card('P', person);
if (hdr) {
if (jobname == NULL) {
if (argc == 1)
jobname = "stdin";
else
jobname = 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')
for (i = 0; i < 4; i++)
if (fonts[i] != NULL)
card('1'+i, fonts[i]);
if (width != NULL)
card('W', width);
if (argc == 1)
copy(0, " ");
else while (--argc) {
if ((f = test(arg = *++argv)) < 0)
continue; /* file unreasonable */
if ((f & 1) && (cp = linked(arg)) != NULL) {
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 & 2)
card('U', cp);
card('N', arg);
dfname[inchar]++;
nact++;
} else {
if ((i = open(arg, 0)) < 0) {
printf("%s: cannot open %s\n", name, arg);
continue;
}
copy(i, arg);
(void) close(i);
if ((f & 2) && unlink(arg))
printf("%s: cannot remove %s\n", name, arg);
}
}
if (nact) {
tfname[inchar]--;
if (link(tfname, cfname) < 0) {
printf("%s: cannot rename %s\n", name, cfname);
tfname[inchar]++;
out();
}
unlink(tfname);
if (qflag) /* just q things up */
exit(0);
if (*LP && stat(LP, &stb) >= 0 && (stb.st_mode & 0777) == 0) {
printf("jobs queued, but line printer is down.\n");
exit(0);
}
execl(DN, (arg = rindex(DN, '/')) ? arg+1 : DN, printer, 0);
printf("jobs queued, but cannot start daemon.\n");
exit(0);
}
out();
/*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;
if (nr++ > MX) {
printf("%s: %s: copy file is too large\n", name, n);
break;
}
}
}
(void) close(fd);
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;
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);
out();
}
#ifdef BSD41C
if (chown(n, userid, -1) < 0) {
#else
if (chown(n, userid, getegid()) < 0) {
#endif
unlink(n);
printf("%s: cannot chown %s\n", name, n);
out();
}
n[inchar]++;
return(f);
}
/*
* Cleanup after interrupts and errors.
*/
out()
{
register i;
signal(SIGHUP, SIG_IGN);
signal(SIGINT, SIG_IGN);
signal(SIGQUIT, SIG_IGN);
signal(SIGTERM, SIG_IGN);
i = inchar;
if (tfname)
while (tfname[i] != 'A') {
tfname[i]--;
unlink(tfname);
}
if (cfname)
while (cfname[i] != 'A') {
cfname[i]--;
unlink(cfname);
}
if (dfname)
while (dfname[i] != 'A') {
dfname[i]--;
unlink(dfname);
}
exit();
}
/*
* Test to see if this is a printable file.
* Return -1 if it is not, 1 if we should try to link and or in 2 if
* we should remove it after printing.
*/
test(file)
char *file;
{
struct exec execb;
struct stat statb;
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 ((fd = open(file, 0)) < 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);
fd = 0;
if (lflag && (statb.st_mode & 04))
fd |= 1;
if (rflag) {
if ((cp = rindex(file, '/')) == NULL) {
if (access(".", 2) == 0)
fd |= 2;
} else {
*cp = '\0';
if (access(file, 2) == 0)
fd |= 2;
*cp = '/';
}
}
return(fd);
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)
register char *s;
{
static char buf[BUFSIZ/2];
char b[BUFSIZ];
int stat;
char *bp = buf;
if ((stat = pgetent(b, s)) < 0) {
printf("%s: can't open printer description file\n", name);
exit(3);
} else if (stat == 0)
return(0);
if ((DN = pgetstr("dn", &bp)) == NULL)
DN = DEFDAEMON;
if ((LP = pgetstr("lp", &bp)) == NULL)
LP = DEFDEVLP;
if ((SD = pgetstr("sd", &bp)) == NULL)
SD = DEFSPOOL;
if ((MX = pgetnum("mx")) < 0)
MX = DEFMX;
RM = pgetstr("rm", &bp);
return(1);
}
/*
* Make the temp files.
*/
mktemps()
{
register int c, len;
int n;
char buf[BUFSIZ], *mktemp();
FILE *fp;
(void) sprintf(buf, "%s/.seq", SD);
if ((fp = fopen(buf, "r+")) == NULL) {
if ((fp = fopen(buf, "w")) == NULL) {
printf("%s: cannot create %s\n", name, buf);
exit(1);
}
setbuf(fp, buf);
n = 0;
} else {
setbuf(fp, buf);
#ifdef BSD41C
if (flock(fileno(fp), FEXLOCK)) {
printf("%s: cannot lock %s\n", name, buf);
exit(1);
}
#endif
n = 0;
while ((c = getc(fp)) >= '0' && c <= '9')
n = n * 10 + (c - '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) fseek(fp, 0L, 0);
fprintf(fp, "%d\n", n);
(void) fclose(fp);
}
/*
* Make a temp file name.
*/
char *
mktemp(id, num, len)
char *id;
int num, len;
{
register char *s;
if ((s = malloc(len)) == NULL) {
printf("%s: out of memory\n", name);
exit(1);
}
(void) sprintf(s, "%s/%sA%03d%s", SD, id, num, host);
return(s);
}