FreeBSD-5.3/usr.sbin/lpr/common_source/rmjob.c
/*
* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*/
#if 0
#ifndef lint
static char sccsid[] = "@(#)rmjob.c 8.2 (Berkeley) 4/28/95";
#endif /* not lint */
#endif
#include "lp.cdefs.h" /* A cross-platform version of <sys/cdefs.h> */
__FBSDID("$FreeBSD: src/usr.sbin/lpr/common_source/rmjob.c,v 1.20 2003/10/26 03:01:24 peter Exp $");
#include <sys/param.h>
#include <sys/uio.h>
#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define psignal foil_gcc_psignal
#define sys_siglist foil_gcc_siglist
#include <unistd.h>
#undef psignal
#undef sys_siglist
#include "lp.h"
#include "lp.local.h"
#include "pathnames.h"
/*
* rmjob - remove the specified jobs from the queue.
*/
/*
* Stuff for handling lprm specifications
*/
static char root[] = "root";
static int all = 0; /* eliminate all files (root only) */
static int cur_daemon; /* daemon's pid */
static char current[7+MAXHOSTNAMELEN]; /* active control file name */
extern uid_t uid, euid; /* real and effective user id's */
static void alarmhandler(int _signo);
static void do_unlink(char *_file);
void
rmjob(const char *printer)
{
register int i, nitems;
int assasinated = 0;
struct dirent **files;
char *cp;
struct printer myprinter, *pp = &myprinter;
init_printer(pp);
if ((i = getprintcap(printer, pp)) < 0)
fatal(pp, "getprintcap: %s", pcaperr(i));
if ((cp = checkremote(pp))) {
printf("Warning: %s\n", cp);
free(cp);
}
/*
* 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 == local_host)
fatal(pp, "The login name \"-all\" is reserved");
all = 1; /* all those from 'from_host' */
person = root;
}
seteuid(euid);
if (chdir(pp->spool_dir) < 0)
fatal(pp, "cannot chdir to spool directory");
if ((nitems = scandir(".", &files, iscf, NULL)) < 0)
fatal(pp, "cannot access spool directory");
seteuid(uid);
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(pp, pp->lock_file) && chk(current)) {
seteuid(euid);
assasinated = kill(cur_daemon, SIGINT) == 0;
seteuid(uid);
if (!assasinated)
fatal(pp, "cannot kill printer daemon");
}
/*
* process the files
*/
for (i = 0; i < nitems; i++)
process(pp, files[i]->d_name);
}
rmremote(pp);
/*
* Restart the printer daemon if it was killed
*/
if (assasinated && !startdaemon(pp))
fatal(pp, "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.
*/
int
lockchk(struct printer *pp, char *slockf)
{
register FILE *fp;
register int i, n;
seteuid(euid);
if ((fp = fopen(slockf, "r")) == NULL) {
if (errno == EACCES)
fatal(pp, "%s: %s", slockf, strerror(errno));
else
return(0);
}
seteuid(uid);
if (!getline(fp)) {
(void) fclose(fp);
return(0); /* no daemon present */
}
cur_daemon = atoi(line);
if (kill(cur_daemon, 0) < 0 && errno != EPERM) {
(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.
*/
void
process(const struct printer *pp, char *file)
{
FILE *cfp;
if (!chk(file))
return;
seteuid(euid);
if ((cfp = fopen(file, "r")) == NULL)
fatal(pp, "cannot open %s", file);
seteuid(uid);
while (getline(cfp)) {
switch (line[0]) {
case 'U': /* unlink associated files */
if (strchr(line+1, '/') || strncmp(line+1, "df", 2))
break;
do_unlink(line+1);
}
}
(void) fclose(cfp);
do_unlink(file);
}
static void
do_unlink(char *file)
{
int ret;
if (from_host != local_host)
printf("%s: ", local_host);
seteuid(euid);
ret = unlink(file);
seteuid(uid);
printf(ret ? "cannot dequeue %s\n" : "%s dequeued\n", file);
}
/*
* Do the dirty work in checking
*/
int
chk(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 == local_host || !strcmp(from_host, file+6)))
return(1);
/*
* get the owner's name from the control file.
*/
seteuid(euid);
if ((cfp = fopen(file, "r")) == NULL)
return(0);
seteuid(uid);
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.
*/
int
isowner(char *owner, char *file)
{
if (!strcmp(person, root) && (from_host == local_host ||
!strcmp(from_host, file+6)))
return (1);
if (!strcmp(person, owner) && !strcmp(from_host, file+6))
return (1);
if (from_host != local_host)
printf("%s: ", local_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.
*/
void
rmremote(const struct printer *pp)
{
int i, elem, firstreq, niov, rem, totlen;
char buf[BUFSIZ];
void (*savealrm)(int);
struct iovec *iov;
if (!pp->remote)
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);
/*
* Counting:
* 4 == "\5" + remote_queue + " " + person
* 2 * users == " " + user[i] for each user
* requests == asprintf results for each request
* 1 == "\n"
* Although laborious, doing it this way makes it possible for
* us to process requests of indeterminate length without
* applying an arbitrary limit. Arbitrary Limits Are Bad (tm).
*/
if (users > 0)
niov = 4 + 2 * users + requests + 1;
else
niov = 4 + requests + 1;
iov = malloc(niov * sizeof *iov);
if (iov == 0)
fatal(pp, "out of memory in rmremote()");
iov[0].iov_base = "\5";
iov[1].iov_base = pp->remote_queue;
iov[2].iov_base = " ";
iov[3].iov_base = all ? "-all" : person;
elem = 4;
for (i = 0; i < users; i++) {
iov[elem].iov_base = " ";
iov[elem + 1].iov_base = user[i];
elem += 2;
}
firstreq = elem;
for (i = 0; i < requests; i++) {
asprintf((char **)&iov[elem].iov_base, " %d", requ[i]);
if (iov[elem].iov_base == 0)
fatal(pp, "out of memory in rmremote()");
elem++;
}
iov[elem++].iov_base = "\n";
for (totlen = i = 0; i < niov; i++)
totlen += (iov[i].iov_len = strlen(iov[i].iov_base));
savealrm = signal(SIGALRM, alarmhandler);
alarm(pp->conn_timeout);
rem = getport(pp, pp->remote_host, 0);
(void)signal(SIGALRM, savealrm);
if (rem < 0) {
if (from_host != local_host)
printf("%s: ", local_host);
printf("connection to %s is down\n", pp->remote_host);
} else {
if (writev(rem, iov, niov) != totlen)
fatal(pp, "Lost connection");
while ((i = read(rem, buf, sizeof(buf))) > 0)
(void) fwrite(buf, 1, i, stdout);
(void) close(rem);
}
for (i = 0; i < requests; i++)
free(iov[firstreq + i].iov_base);
free(iov);
}
/*
* Return 1 if the filename begins with 'cf'
*/
int
iscf(struct dirent *d)
{
return(d->d_name[0] == 'c' && d->d_name[1] == 'f');
}
void
alarmhandler(int signo __unused)
{
/* the signal is ignored */
/* (the '__unused' is just to avoid a compile-time warning) */
}