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120 lines
3.2 KiB
120 lines
3.2 KiB
/*
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* Copyright (C) 2015 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
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*
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* Authors: Mickey Sola
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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#if HAVE_CONFIG_H
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#include "clamav-config.h"
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#endif
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#if defined(FANOTIFY)
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <fcntl.h>
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#include <fts.h>
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#include <signal.h>
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#include <pthread.h>
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#include "shared/optparser.h"
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#include "shared/output.h"
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#include "others.h"
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#include "onaccess_scth.h"
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static void onas_scth_handle_dir(const char *pathname);
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static void onas_scth_handle_file(const char *pathname);
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static void onas_scth_exit(int sig);
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static void onas_scth_exit(int sig) {
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logg("*ScanOnAccess: onas_scth_exit(), signal %d\n", sig);
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pthread_exit(NULL);
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}
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static void onas_scth_handle_dir(const char *pathname) {
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FTS *ftsp = NULL;
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int ftspopts = FTS_PHYSICAL | FTS_XDEV;
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FTSENT *curr = NULL;
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char *const pathargv[] = { (char *) pathname, NULL };
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if (!(ftsp = fts_open(pathargv, ftspopts, NULL))) return;
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/* Offload scanning work to fanotify thread to avoid potential deadlocks. */
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while ((curr = fts_read(ftsp))) {
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if (curr->fts_info != FTS_D) {
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int fd = open(curr->fts_path, O_RDONLY);
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if (fd > 0) close(fd);
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}
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}
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return;
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}
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static void onas_scth_handle_file(const char *pathname) {
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if (!pathname) return;
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/* Offload scanning work to fanotify thread to avoid potential deadlocks. */
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int fd = open(pathname, O_RDONLY);
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if (fd > 0) close(fd);
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return;
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}
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void *onas_scan_th(void *arg) {
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struct scth_thrarg *tharg = (struct scth_thrarg *) arg;
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sigset_t sigset;
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struct sigaction act;
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/* ignore all signals except SIGUSR1 */
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sigfillset(&sigset);
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sigdelset(&sigset, SIGUSR1);
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/* The behavior of a process is undefined after it ignores a
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* SIGFPE, SIGILL, SIGSEGV, or SIGBUS signal */
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sigdelset(&sigset, SIGFPE);
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sigdelset(&sigset, SIGILL);
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sigdelset(&sigset, SIGSEGV);
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#ifdef SIGBUS
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sigdelset(&sigset, SIGBUS);
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#endif
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pthread_sigmask(SIG_SETMASK, &sigset, NULL);
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memset(&act, 0, sizeof(struct sigaction));
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act.sa_handler = onas_scth_exit;
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sigfillset(&(act.sa_mask));
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sigaction(SIGUSR1, &act, NULL);
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sigaction(SIGSEGV, &act, NULL);
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if (tharg->options & ONAS_SCTH_ISDIR) {
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logg("ScanOnAccess: Performing additional scanning on directory '%s'\n", tharg->pathname);
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onas_scth_handle_dir(tharg->pathname);
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} else if (tharg->options & ONAS_SCTH_ISFILE) {
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logg("ScanOnAccess: Performing additional scanning on file '%s'\n", tharg->pathname);
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onas_scth_handle_file(tharg->pathname);
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}
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free(tharg->pathname);
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tharg->pathname = NULL;
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return NULL;
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}
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#endif
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