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76 lines
2.0 KiB
C
76 lines
2.0 KiB
C
/* Copyright (C) 2018 Open Information Security Foundation
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*
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* You can copy, redistribute or modify this Program under the terms of
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* the GNU General Public License version 2 as published by the Free
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* 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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* version 2 along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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/**
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* \file
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*
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* \author Eric Leblond <eric@regit.org>
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*/
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#include "suricata-common.h"
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#include "util-bpf.h"
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#include "threads.h"
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#if !defined __OpenBSD__
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/** protect bpf filter build, as it is not thread safe */
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static SCMutex bpf_set_filter_lock = SCMUTEX_INITIALIZER;
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void SCBPFFree(struct bpf_program *program)
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{
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if (program)
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pcap_freecode(program);
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}
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int SCBPFCompile(int snaplen_arg, int linktype_arg, struct bpf_program *program,
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const char *buf,
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int optimize, uint32_t mask,
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char *errbuf, size_t errbuf_len)
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{
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pcap_t *p;
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int ret;
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p = pcap_open_dead(linktype_arg, snaplen_arg);
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if (p == NULL)
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return (-1);
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SCMutexLock(&bpf_set_filter_lock);
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ret = pcap_compile(p, program, buf, optimize, mask);
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if (ret == -1) {
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if (errbuf) {
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snprintf(errbuf, errbuf_len, "%s", pcap_geterr(p));
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}
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pcap_close(p);
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SCMutexUnlock(&bpf_set_filter_lock);
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return (-1);
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}
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pcap_close(p);
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SCMutexUnlock(&bpf_set_filter_lock);
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if (program->bf_insns == NULL) {
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if (errbuf) {
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snprintf(errbuf, errbuf_len, "Filter badly setup");
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}
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SCBPFFree(program);
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return (-1);
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}
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return (ret);
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}
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#endif /* Not __OpenBSD__ */
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