4.3BSD/usr/src/usr.lib/lpr/rmjob.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
static char sccsid[] = "@(#)rmjob.c 5.1 (Berkeley) 6/6/85";
#endif not lint
/*
* rmjob - remove the specified jobs from the queue.
*/
#include "lp.h"
/*
* Stuff for handling lprm specifications
*/
extern char *user[]; /* users to process */
extern int users; /* # of users in user array */
extern int requ[]; /* job number of spool entries */
extern int requests; /* # of spool requests */
extern char *person; /* name of person doing lprm */
char root[] = "root";
int all = 0; /* eliminate all files (root only) */
int cur_daemon; /* daemon's pid */
char current[40]; /* active control file name */
int iscf();
rmjob()
{
register int i, nitems;
int assasinated = 0;
struct direct **files;
if ((i = pgetent(line, printer)) < 0)
fatal("cannot open printer description file");
else if (i == 0)
fatal("unknown printer");
if ((SD = pgetstr("sd", &bp)) == NULL)
SD = DEFSPOOL;
if ((LO = pgetstr("lo", &bp)) == NULL)
LO = DEFLOCK;
if ((LP = pgetstr("lp", &bp)) == NULL)
LP = DEFDEVLP;
if ((RP = pgetstr("rp", &bp)) == NULL)
RP = DEFLP;
RM = pgetstr("rm", &bp);
/*
* If the format was `lprm -' and the user isn't the super-user,
* then fake things to look like he said `lprm user'.
*/
if (users < 0) {
if (getuid() == 0)
all = 1; /* all files in local queue */
else {
user[0] = person;
users = 1;
}
}
if (!strcmp(person, "-all")) {
if (from == host)
fatal("The login name \"-all\" is reserved");
all = 1; /* all those from 'from' */
person = root;
}
if (chdir(SD) < 0)
fatal("cannot chdir to spool directory");
if ((nitems = scandir(".", &files, iscf, NULL)) < 0)
fatal("cannot access spool directory");
if (nitems) {
/*
* Check for an active printer daemon (in which case we
* kill it if it is reading our file) then remove stuff
* (after which we have to restart the daemon).
*/
if (lockchk(LO) && chk(current)) {
assasinated = kill(cur_daemon, SIGINT) == 0;
if (!assasinated)
fatal("cannot kill printer daemon");
}
/*
* process the files
*/
for (i = 0; i < nitems; i++)
process(files[i]->d_name);
}
chkremote();
/*
* Restart the printer daemon if it was killed
*/
if (assasinated && !startdaemon(printer))
fatal("cannot restart printer daemon\n");
exit(0);
}
/*
* Process a lock file: collect the pid of the active
* daemon and the file name of the active spool entry.
* Return boolean indicating existence of a lock file.
*/
lockchk(s)
char *s;
{
register FILE *fp;
register int i, n;
if ((fp = fopen(s, "r")) == NULL)
if (errno == EACCES)
fatal("can't access lock file");
else
return(0);
if (!getline(fp)) {
(void) fclose(fp);
return(0); /* no daemon present */
}
cur_daemon = atoi(line);
if (kill(cur_daemon, 0) < 0) {
(void) fclose(fp);
return(0); /* no daemon present */
}
for (i = 1; (n = fread(current, sizeof(char), sizeof(current), fp)) <= 0; i++) {
if (i > 5) {
n = 1;
break;
}
sleep(i);
}
current[n-1] = '\0';
(void) fclose(fp);
return(1);
}
/*
* Process a control file.
*/
process(file)
char *file;
{
FILE *cfp;
if (!chk(file))
return;
if ((cfp = fopen(file, "r")) == NULL)
fatal("cannot open %s", file);
while (getline(cfp)) {
switch (line[0]) {
case 'U': /* unlink associated files */
if (from != host)
printf("%s: ", host);
printf(unlink(line+1) ? "cannot dequeue %s\n" :
"%s dequeued\n", line+1);
}
}
(void) fclose(cfp);
if (from != host)
printf("%s: ", host);
printf(unlink(file) ? "cannot dequeue %s\n" : "%s dequeued\n", file);
}
/*
* Do the dirty work in checking
*/
chk(file)
char *file;
{
register int *r, n;
register char **u, *cp;
FILE *cfp;
/*
* Check for valid cf file name (mostly checking current).
*/
if (strlen(file) < 7 || file[0] != 'c' || file[1] != 'f')
return(0);
if (all && (from == host || !strcmp(from, file+6)))
return(1);
/*
* get the owner's name from the control file.
*/
if ((cfp = fopen(file, "r")) == NULL)
return(0);
while (getline(cfp)) {
if (line[0] == 'P')
break;
}
(void) fclose(cfp);
if (line[0] != 'P')
return(0);
if (users == 0 && requests == 0)
return(!strcmp(file, current) && isowner(line+1, file));
/*
* Check the request list
*/
for (n = 0, cp = file+3; isdigit(*cp); )
n = n * 10 + (*cp++ - '0');
for (r = requ; r < &requ[requests]; r++)
if (*r == n && isowner(line+1, file))
return(1);
/*
* Check to see if it's in the user list
*/
for (u = user; u < &user[users]; u++)
if (!strcmp(*u, line+1) && isowner(line+1, file))
return(1);
return(0);
}
/*
* If root is removing a file on the local machine, allow it.
* If root is removing a file from a remote machine, only allow
* files sent from the remote machine to be removed.
* Normal users can only remove the file from where it was sent.
*/
isowner(owner, file)
char *owner, *file;
{
if (!strcmp(person, root) && (from == host || !strcmp(from, file+6)))
return(1);
if (!strcmp(person, owner) && !strcmp(from, file+6))
return(1);
if (from != host)
printf("%s: ", host);
printf("%s: Permission denied\n", file);
return(0);
}
/*
* Check to see if we are sending files to a remote machine. If we are,
* then try removing files on the remote machine.
*/
chkremote()
{
register char *cp;
register int i, rem;
char buf[BUFSIZ];
if (*LP || RM == NULL)
return; /* not sending to a remote machine */
/*
* Flush stdout so the user can see what has been deleted
* while we wait (possibly) for the connection.
*/
fflush(stdout);
sprintf(buf, "\5%s %s", RP, all ? "-all" : person);
cp = buf;
for (i = 0; i < users; i++) {
cp += strlen(cp);
*cp++ = ' ';
strcpy(cp, user[i]);
}
for (i = 0; i < requests; i++) {
cp += strlen(cp);
(void) sprintf(cp, " %d", requ[i]);
}
strcat(cp, "\n");
rem = getport(RM);
if (rem < 0) {
if (from != host)
printf("%s: ", host);
printf("connection to %s is down\n", RM);
} else {
i = strlen(buf);
if (write(rem, buf, i) != i)
fatal("Lost connection");
while ((i = read(rem, buf, sizeof(buf))) > 0)
(void) fwrite(buf, 1, i, stdout);
(void) close(rem);
}
}
/*
* Return 1 if the filename begins with 'cf'
*/
iscf(d)
struct direct *d;
{
return(d->d_name[0] == 'c' && d->d_name[1] == 'f');
}