forked from OISF/suricata
-
Notifications
You must be signed in to change notification settings - Fork 0
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
util-bpf: introduce custom BPF compile functions
We can't get error from pcap_compile_nopcap() so let's get our own function and output message.
- Loading branch information
Showing
3 changed files
with
107 additions
and
0 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,73 @@ | ||
/* Copyright (C) 2018 Open Information Security Foundation | ||
* | ||
* You can copy, redistribute or modify this Program under the terms of | ||
* the GNU General Public License version 2 as published by the Free | ||
* Software Foundation. | ||
* | ||
* This program is distributed in the hope that it will be useful, | ||
* but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
* GNU General Public License for more details. | ||
* | ||
* You should have received a copy of the GNU General Public License | ||
* version 2 along with this program; if not, write to the Free Software | ||
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | ||
* 02110-1301, USA. | ||
*/ | ||
|
||
/** | ||
* \file | ||
* | ||
* \author Eric Leblond <[email protected]> | ||
*/ | ||
|
||
|
||
#include "suricata-common.h" | ||
#include "config.h" | ||
#include "suricata.h" | ||
#include "util-bpf.h" | ||
|
||
|
||
/** protect bpf filter build, as it is not thread safe */ | ||
static SCMutex bpf_set_filter_lock = SCMUTEX_INITIALIZER; | ||
|
||
void SCBPFFree(struct bpf_program *program) | ||
{ | ||
if (program) | ||
pcap_freecode(program); | ||
} | ||
|
||
int SCBPFCompile(int snaplen_arg, int linktype_arg, struct bpf_program *program, | ||
const char *buf, int optimize, uint32_t mask, | ||
char *errbuf, size_t errbuf_len) | ||
{ | ||
pcap_t *p; | ||
int ret; | ||
|
||
p = pcap_open_dead(linktype_arg, snaplen_arg); | ||
if (p == NULL) | ||
return (-1); | ||
|
||
SCMutexLock(&bpf_set_filter_lock); | ||
ret = pcap_compile(p, program, buf, optimize, mask); | ||
if (ret == -1) { | ||
if (errbuf) { | ||
snprintf(errbuf, errbuf_len, "%s", pcap_geterr(p)); | ||
} | ||
pcap_close(p); | ||
SCMutexUnlock(&bpf_set_filter_lock); | ||
return (-1); | ||
} | ||
pcap_close(p); | ||
SCMutexUnlock(&bpf_set_filter_lock); | ||
|
||
if (program->bf_insns == NULL) { | ||
if (errbuf) { | ||
snprintf(errbuf, errbuf_len, "Filter badly setup"); | ||
} | ||
SCBPFFree(program); | ||
return (-1); | ||
} | ||
|
||
return (ret); | ||
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,33 @@ | ||
/* Copyright (C) 2018 Open Information Security Foundation | ||
* | ||
* You can copy, redistribute or modify this Program under the terms of | ||
* the GNU General Public License version 2 as published by the Free | ||
* Software Foundation. | ||
* | ||
* This program is distributed in the hope that it will be useful, | ||
* but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
* GNU General Public License for more details. | ||
* | ||
* You should have received a copy of the GNU General Public License | ||
* version 2 along with this program; if not, write to the Free Software | ||
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | ||
* 02110-1301, USA. | ||
*/ | ||
|
||
/** | ||
* \file | ||
* | ||
* \author Eric Leblond <[email protected]> | ||
*/ | ||
|
||
#ifndef __UTIL_BPF_H__ | ||
#define __UTIL_BPF_H__ | ||
|
||
int SCBPFCompile(int snaplen_arg, int linktype_arg, struct bpf_program *program, | ||
const char *buf, int optimize, uint32_t mask, | ||
char *errbuf, size_t errbuf_len); | ||
|
||
void SCBPFFree(struct bpf_program *program); | ||
|
||
#endif /* __UTIL_BPF_H__ */ |