7a91df3c37
Mark variables static where possible and place the uid/euid variables in lp.h, so that we can compile-time enforce that these variables have the same type.
393 lines
9.7 KiB
C
393 lines
9.7 KiB
C
/*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if 0
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#ifndef lint
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static char sccsid[] = "@(#)rmjob.c 8.2 (Berkeley) 4/28/95";
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#endif /* not lint */
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#endif
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#include "lp.cdefs.h" /* A cross-platform version of <sys/cdefs.h> */
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/uio.h>
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#include <ctype.h>
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#include <dirent.h>
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#include <err.h>
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#include <errno.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define psignal foil_gcc_psignal
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#define sys_siglist foil_gcc_siglist
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#include <unistd.h>
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#undef psignal
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#undef sys_siglist
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#include "lp.h"
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#include "lp.local.h"
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#include "pathnames.h"
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/*
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* rmjob - remove the specified jobs from the queue.
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*/
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/*
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* Stuff for handling lprm specifications
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*/
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static char root[] = "root";
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static int all = 0; /* eliminate all files (root only) */
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static int cur_daemon; /* daemon's pid */
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static char current[7+MAXHOSTNAMELEN]; /* active control file name */
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static void alarmhandler(int _signo);
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static void do_unlink(char *_file);
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static int isowner(char *_owner, char *_file, const char *_cfhost);
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void
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rmjob(const char *printer)
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{
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register int i, nitems;
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int assassinated = 0;
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struct dirent **files;
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char *cp;
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struct printer myprinter, *pp = &myprinter;
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init_printer(pp);
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if ((i = getprintcap(printer, pp)) < 0)
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fatal(pp, "getprintcap: %s", pcaperr(i));
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if ((cp = checkremote(pp))) {
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printf("Warning: %s\n", cp);
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free(cp);
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}
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/*
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* If the format was `lprm -' and the user isn't the super-user,
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* then fake things to look like he said `lprm user'.
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*/
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if (users < 0) {
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if (getuid() == 0)
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all = 1; /* all files in local queue */
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else {
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user[0] = person;
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users = 1;
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}
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}
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if (!strcmp(person, "-all")) {
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if (from_host == local_host)
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fatal(pp, "The login name \"-all\" is reserved");
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all = 1; /* all those from 'from_host' */
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person = root;
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}
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PRIV_START
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if (chdir(pp->spool_dir) < 0)
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fatal(pp, "cannot chdir to spool directory");
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if ((nitems = scandir(".", &files, iscf, NULL)) < 0)
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fatal(pp, "cannot access spool directory");
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PRIV_END
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if (nitems) {
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/*
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* Check for an active printer daemon (in which case we
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* kill it if it is reading our file) then remove stuff
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* (after which we have to restart the daemon).
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*/
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if (lockchk(pp, pp->lock_file) && chk(current)) {
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PRIV_START
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assassinated = kill(cur_daemon, SIGINT) == 0;
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PRIV_END
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if (!assassinated)
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fatal(pp, "cannot kill printer daemon");
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}
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/*
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* process the files
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*/
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for (i = 0; i < nitems; i++)
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process(pp, files[i]->d_name);
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}
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rmremote(pp);
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/*
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* Restart the printer daemon if it was killed
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*/
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if (assassinated && !startdaemon(pp))
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fatal(pp, "cannot restart printer daemon\n");
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exit(0);
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}
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/*
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* Process a lock file: collect the pid of the active
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* daemon and the file name of the active spool entry.
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* Return boolean indicating existence of a lock file.
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*/
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int
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lockchk(struct printer *pp, char *slockf)
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{
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register FILE *fp;
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register int i, n;
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PRIV_START
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if ((fp = fopen(slockf, "r")) == NULL) {
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if (errno == EACCES)
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fatal(pp, "%s: %s", slockf, strerror(errno));
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else
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return(0);
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}
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PRIV_END
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if (!getline(fp)) {
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(void) fclose(fp);
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return(0); /* no daemon present */
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}
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cur_daemon = atoi(line);
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if (kill(cur_daemon, 0) < 0 && errno != EPERM) {
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(void) fclose(fp);
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return(0); /* no daemon present */
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}
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for (i = 1; (n = fread(current, sizeof(char), sizeof(current), fp)) <= 0; i++) {
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if (i > 5) {
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n = 1;
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break;
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}
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sleep(i);
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}
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current[n-1] = '\0';
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(void) fclose(fp);
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return(1);
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}
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/*
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* Process a control file.
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*/
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void
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process(const struct printer *pp, char *file)
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{
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FILE *cfp;
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if (!chk(file))
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return;
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PRIV_START
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if ((cfp = fopen(file, "r")) == NULL)
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fatal(pp, "cannot open %s", file);
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PRIV_END
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while (getline(cfp)) {
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switch (line[0]) {
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case 'U': /* unlink associated files */
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if (strchr(line+1, '/') || strncmp(line+1, "df", 2))
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break;
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do_unlink(line+1);
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}
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}
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(void) fclose(cfp);
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do_unlink(file);
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}
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static void
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do_unlink(char *file)
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{
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int ret;
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if (from_host != local_host)
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printf("%s: ", local_host);
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PRIV_START
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ret = unlink(file);
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PRIV_END
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printf(ret ? "cannot dequeue %s\n" : "%s dequeued\n", file);
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}
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/*
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* Do the dirty work in checking
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*/
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int
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chk(char *file)
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{
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int *r, jnum;
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char **u;
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const char *cfhost;
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FILE *cfp;
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/*
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* Check for valid cf file name (mostly checking current).
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*/
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if (strlen(file) < 7 || file[0] != 'c' || file[1] != 'f')
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return(0);
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jnum = calc_jobnum(file, &cfhost);
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if (all && (from_host == local_host || !strcmp(from_host, cfhost)))
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return(1);
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/*
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* get the owner's name from the control file.
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*/
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PRIV_START
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if ((cfp = fopen(file, "r")) == NULL)
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return(0);
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PRIV_END
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while (getline(cfp)) {
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if (line[0] == 'P')
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break;
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}
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(void) fclose(cfp);
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if (line[0] != 'P')
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return(0);
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if (users == 0 && requests == 0)
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return(!strcmp(file, current) && isowner(line+1, file, cfhost));
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/*
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* Check the request list
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*/
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for (r = requ; r < &requ[requests]; r++)
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if (*r == jnum && isowner(line+1, file, cfhost))
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return(1);
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/*
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* Check to see if it's in the user list
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*/
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for (u = user; u < &user[users]; u++)
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if (!strcmp(*u, line+1) && isowner(line+1, file, cfhost))
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return(1);
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return(0);
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}
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/*
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* If root is removing a file on the local machine, allow it.
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* If root is removing a file from a remote machine, only allow
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* files sent from the remote machine to be removed.
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* Normal users can only remove the file from where it was sent.
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*/
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static int
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isowner(char *owner, char *file, const char *cfhost)
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{
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if (!strcmp(person, root) && (from_host == local_host ||
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!strcmp(from_host, cfhost)))
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return (1);
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if (!strcmp(person, owner) && !strcmp(from_host, cfhost))
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return (1);
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if (from_host != local_host)
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printf("%s: ", local_host);
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printf("%s: Permission denied\n", file);
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return(0);
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}
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/*
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* Check to see if we are sending files to a remote machine. If we are,
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* then try removing files on the remote machine.
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*/
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void
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rmremote(const struct printer *pp)
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{
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int i, elem, firstreq, niov, rem, totlen;
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char buf[BUFSIZ];
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void (*savealrm)(int);
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struct iovec *iov;
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if (!pp->remote)
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return; /* not sending to a remote machine */
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/*
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* Flush stdout so the user can see what has been deleted
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* while we wait (possibly) for the connection.
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*/
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fflush(stdout);
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/*
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* Counting:
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* 4 == "\5" + remote_queue + " " + person
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* 2 * users == " " + user[i] for each user
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* requests == asprintf results for each request
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* 1 == "\n"
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* Although laborious, doing it this way makes it possible for
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* us to process requests of indeterminate length without
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* applying an arbitrary limit. Arbitrary Limits Are Bad (tm).
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*/
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if (users > 0)
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niov = 4 + 2 * users + requests + 1;
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else
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niov = 4 + requests + 1;
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iov = malloc(niov * sizeof *iov);
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if (iov == 0)
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fatal(pp, "out of memory in rmremote()");
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iov[0].iov_base = "\5";
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iov[1].iov_base = pp->remote_queue;
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iov[2].iov_base = " ";
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iov[3].iov_base = all ? "-all" : person;
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elem = 4;
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for (i = 0; i < users; i++) {
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iov[elem].iov_base = " ";
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iov[elem + 1].iov_base = user[i];
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elem += 2;
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}
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firstreq = elem;
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for (i = 0; i < requests; i++) {
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asprintf((char **)&iov[elem].iov_base, " %d", requ[i]);
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if (iov[elem].iov_base == 0)
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fatal(pp, "out of memory in rmremote()");
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elem++;
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}
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iov[elem++].iov_base = "\n";
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for (totlen = i = 0; i < niov; i++)
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totlen += (iov[i].iov_len = strlen(iov[i].iov_base));
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savealrm = signal(SIGALRM, alarmhandler);
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alarm(pp->conn_timeout);
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rem = getport(pp, pp->remote_host, 0);
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(void)signal(SIGALRM, savealrm);
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if (rem < 0) {
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if (from_host != local_host)
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printf("%s: ", local_host);
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printf("connection to %s is down\n", pp->remote_host);
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} else {
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if (writev(rem, iov, niov) != totlen)
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fatal(pp, "Lost connection");
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while ((i = read(rem, buf, sizeof(buf))) > 0)
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(void) fwrite(buf, 1, i, stdout);
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(void) close(rem);
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}
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for (i = 0; i < requests; i++)
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free(iov[firstreq + i].iov_base);
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free(iov);
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}
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/*
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* Return 1 if the filename begins with 'cf'
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*/
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int
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iscf(const struct dirent *d)
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{
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return(d->d_name[0] == 'c' && d->d_name[1] == 'f');
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}
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void
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alarmhandler(int signo __unused)
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{
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/* the signal is ignored */
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/* (the '__unused' is just to avoid a compile-time warning) */
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}
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