osmith
/
wireshark
forked from osmocom/wireshark
1
0
Fork 0
Code Pull Requests Releases Wiki Activity
wireshark/packet-pflog.c

476 lines
14 KiB
C
Raw Blame History

/* packet-pflog.c
* Routines for pflog (OpenBSD Firewall Logging) packet disassembly
*
* $Id: packet-pflog.c,v 1.9 2003/05/16 00:30:54 guy Exp $
*
* Copyright 2001 Mike Frantzen
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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
* COPYRIGHT HOLDERS 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.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <string.h>
#include <glib.h>
#include <epan/packet.h>
#include "etypes.h"
#include <epan/resolv.h>
#include "packet-ip.h"
#include "packet-ipv6.h"
#include "packet-pflog.h"
#ifndef offsetof
/* Can't trust stddef.h to be there for us */
# define offsetof(type, member) ((size_t)(&((type *)0)->member))
#endif
#ifndef BPF_WORDALIGN
#define BPF_ALIGNMENT sizeof(long)
#define BPF_WORDALIGN(x) (((x) + (BPF_ALIGNMENT - 1)) & ~(BPF_ALIGNMENT - 1))
#endif
static dissector_handle_t data_handle, ip_handle, ipv6_handle;
/* header fields */
static int proto_pflog = -1;
static int hf_pflog_length = -1;
static int hf_pflog_af = -1;
static int hf_pflog_action = -1;
static int hf_pflog_reason = -1;
static int hf_pflog_ifname = -1;
static int hf_pflog_ruleset = -1;
static int hf_pflog_rulenr = -1;
static int hf_pflog_subrulenr = -1;
static int hf_pflog_dir = -1;
static gint ett_pflog = -1;
/* old header */
static int proto_old_pflog = -1;
static int hf_old_pflog_af = -1;
static int hf_old_pflog_ifname = -1;
static int hf_old_pflog_rnr = -1;
static int hf_old_pflog_reason = -1;
static int hf_old_pflog_action = -1;
static int hf_old_pflog_dir = -1;
static gint ett_old_pflog = -1;
void
capture_pflog(const guchar *pd, int offset, int len, packet_counts *ld)
{
struct pfloghdr *pflogh;
unsigned int hdrlen;
pflogh = (struct pfloghdr *)pd;
if (!BYTES_ARE_IN_FRAME(offset, len, sizeof(guint8))) {
ld->other++;
return;
}
if (pflogh->length < MIN_PFLOG_HDRLEN) {
ld->other++;
return;
}
hdrlen = BPF_WORDALIGN(pflogh->length);
if (!BYTES_ARE_IN_FRAME(offset, hdrlen, sizeof(guint8))) {
ld->other++;
return;
}
offset += hdrlen;
switch (pflogh->af) {
case BSD_PF_INET:
capture_ip(pd, offset, len, ld);
break;
#ifdef notyet
case BSD_PF_INET6:
capture_ipv6(pd, offset, len, ld);
break;
#endif
default:
ld->other++;
break;
}
}
static const value_string af_vals[] = {
{ BSD_PF_INET, "IPv4" },
{ BSD_PF_INET6, "IPv6" },
{ 0, NULL }
};
static const value_string reason_vals[] = {
{ 0, "match" },
{ 1, "bad-offset" },
{ 2, "fragment" },
{ 3, "short" },
{ 4, "normalize" },
{ 5, "memory" },
{ 0, NULL }
};
static const value_string action_vals[] = {
{ PF_PASS, "passed" },
{ PF_DROP, "dropped" },
{ PF_SCRUB, "scrubbed" },
{ 0, NULL }
};
static const value_string old_dir_vals[] = {
{ PF_OLD_IN, "in" },
{ PF_OLD_OUT, "out" },
{ 0, NULL }
};
static const value_string dir_vals[] = {
{ PF_INOUT, "inout" },
{ PF_IN, "in" },
{ PF_OUT, "out" },
{ 0, NULL }
};
static void
dissect_pflog(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
#define MAX_RULE_STR 128
struct pfloghdr pflogh;
static char rulestr[MAX_RULE_STR];
tvbuff_t *next_tvb;
proto_tree *pflog_tree;
proto_item *ti;
int hdrlen;
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "PFLOG");
/* Copy out the pflog header to insure alignment */
tvb_memcpy(tvb, (guint8 *)&pflogh, 0, sizeof(pflogh));
/* Byteswap the header now */
pflogh.rulenr = g_ntohl(pflogh.rulenr);
pflogh.subrulenr = g_ntohl(pflogh.subrulenr);
hdrlen = BPF_WORDALIGN(pflogh.length);
if (pflogh.subrulenr == (guint32) -1)
snprintf(rulestr, sizeof(rulestr), "%u",
pflogh.rulenr);
else
snprintf(rulestr, sizeof(rulestr), "%u.%s.%u",
pflogh.rulenr, pflogh.ruleset, pflogh.subrulenr);
if (hdrlen < MIN_PFLOG_HDRLEN) {
if (tree) {
ti = proto_tree_add_protocol_format(tree, proto_pflog, tvb, 0,
hdrlen, "PF Log invalid header length (%u)", hdrlen);
}
if (check_col(pinfo->cinfo, COL_INFO)) {
col_prepend_fstr(pinfo->cinfo, COL_INFO, "Invalid header length %u",
hdrlen);
}
return;
}
if (tree) {
ti = proto_tree_add_protocol_format(tree, proto_pflog, tvb, 0,
hdrlen,
"PF Log %s %s on %s by rule %s",
val_to_str(pflogh.af, af_vals, "unknown (%u)"),
val_to_str(pflogh.action, action_vals, "unknown (%u)"),
pflogh.ifname,
rulestr);
pflog_tree = proto_item_add_subtree(ti, ett_pflog);
proto_tree_add_uint(pflog_tree, hf_pflog_length, tvb,
offsetof(struct pfloghdr, length), sizeof(pflogh.length),
pflogh.length);
proto_tree_add_uint(pflog_tree, hf_pflog_af, tvb,
offsetof(struct pfloghdr, af), sizeof(pflogh.af),
pflogh.af);
proto_tree_add_uint(pflog_tree, hf_pflog_action, tvb,
offsetof(struct pfloghdr, action), sizeof(pflogh.action),
pflogh.action);
proto_tree_add_uint(pflog_tree, hf_pflog_reason, tvb,
offsetof(struct pfloghdr, reason), sizeof(pflogh.reason),
pflogh.reason);
proto_tree_add_string(pflog_tree, hf_pflog_ifname, tvb,
offsetof(struct pfloghdr, ifname), sizeof(pflogh.ifname),
pflogh.ifname);
proto_tree_add_string(pflog_tree, hf_pflog_ruleset, tvb,
offsetof(struct pfloghdr, ruleset), sizeof(pflogh.ruleset),
pflogh.ruleset);
proto_tree_add_int(pflog_tree, hf_pflog_rulenr, tvb,
offsetof(struct pfloghdr, rulenr), sizeof(pflogh.rulenr),
pflogh.rulenr);
proto_tree_add_int(pflog_tree, hf_pflog_subrulenr, tvb,
offsetof(struct pfloghdr, subrulenr), sizeof(pflogh.subrulenr),
pflogh.subrulenr);
proto_tree_add_uint(pflog_tree, hf_pflog_dir, tvb,
offsetof(struct pfloghdr, dir), sizeof(pflogh.dir),
pflogh.dir);
}
/* Set the tvbuff for the payload after the header */
next_tvb = tvb_new_subset(tvb, hdrlen, -1, -1);
switch (pflogh.af) {
case BSD_PF_INET:
call_dissector(ip_handle, next_tvb, pinfo, tree);
break;
case BSD_PF_INET6:
call_dissector(ipv6_handle, next_tvb, pinfo, tree);
break;
default:
call_dissector(data_handle, next_tvb, pinfo, tree);
break;
}
if (check_col(pinfo->cinfo, COL_INFO)) {
col_prepend_fstr(pinfo->cinfo, COL_INFO, "[%s %s/%s] ",
val_to_str(pflogh.action, action_vals, "unknown (%u)"),
pflogh.ifname,
rulestr);
}
}
void
proto_register_pflog(void)
{
static hf_register_info hf[] = {
{ &hf_pflog_length,
{ "Header Length", "pflog.length", FT_UINT8, BASE_DEC, NULL, 0x0,
"Length of Header", HFILL }},
{ &hf_pflog_af,
{ "Address Family", "pflog.af", FT_UINT32, BASE_DEC, VALS(af_vals), 0x0,
"Protocol (IPv4 vs IPv6)", HFILL }},
{ &hf_pflog_action,
{ "Action", "pflog.action", FT_UINT8, BASE_DEC, VALS(action_vals), 0x0,
"Action taken by PF on the packet", HFILL }},
{ &hf_pflog_reason,
{ "Reason", "pflog.reason", FT_UINT8, BASE_DEC, VALS(reason_vals), 0x0,
"Reason for logging the packet", HFILL }},
{ &hf_pflog_ifname,
{ "Interface", "pflog.ifname", FT_STRING, BASE_NONE, NULL, 0x0,
"Interface", HFILL }},
{ &hf_pflog_ruleset,
{ "Ruleset", "pflog.ruleset", FT_STRING, BASE_NONE, NULL, 0x0,
"Ruleset name in anchor", HFILL }},
{ &hf_pflog_rulenr,
{ "Rule Number", "pflog.rulenr", FT_INT32, BASE_DEC, NULL, 0x0,
"Last matched firewall main ruleset rule number", HFILL }},
{ &hf_pflog_subrulenr,
{ "Sub Rule Number", "pflog.subrulenr", FT_INT32, BASE_DEC, NULL, 0x0,
"Last matched firewall anchored ruleset rule number", HFILL }},
{ &hf_pflog_dir,
{ "Direction", "pflog.dir", FT_UINT8, BASE_DEC, VALS(dir_vals), 0x0,
"Direction of packet in stack (inbound versus outbound)", HFILL }},
};
static gint *ett[] = { &ett_pflog };
proto_pflog = proto_register_protocol("OpenBSD Packet Filter log file",
"PFLOG", "pflog");
proto_register_field_array(proto_pflog, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_pflog(void)
{
dissector_handle_t pflog_handle;
ip_handle = find_dissector("ip");
ipv6_handle = find_dissector("ipv6");
data_handle = find_dissector("data");
pflog_handle = create_dissector_handle(dissect_pflog, proto_pflog);
dissector_add("wtap_encap", WTAP_ENCAP_PFLOG, pflog_handle);
}
void
capture_old_pflog(const guchar *pd, int offset, int len, packet_counts *ld)
{
struct old_pfloghdr pflogh;
if (!BYTES_ARE_IN_FRAME(offset, len, (int)OLD_PFLOG_HDRLEN)) {
ld->other++;
return;
}
offset += OLD_PFLOG_HDRLEN;
/* Copy out the pflog header to insure alignment */
memcpy(&pflogh, pd, sizeof(pflogh));
pflogh.af = g_ntohl(pflogh.af);
switch (pflogh.af) {
case BSD_PF_INET:
capture_ip(pd, offset, len, ld);
break;
#ifdef notyet
case BSD_PF_INET6:
capture_ipv6(pd, offset, len, ld);
break;
#endif
default:
ld->other++;
break;
}
}
static void
dissect_old_pflog(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
struct old_pfloghdr pflogh;
tvbuff_t *next_tvb;
proto_tree *pflog_tree;
proto_item *ti;
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "PFLOG-OLD");
/* Copy out the pflog header to insure alignment */
tvb_memcpy(tvb, (guint8 *)&pflogh, 0, sizeof(pflogh));
/* Byteswap the header now */
pflogh.af = g_ntohl(pflogh.af);
pflogh.rnr = g_ntohs(pflogh.rnr);
pflogh.reason = g_ntohs(pflogh.reason);
pflogh.action = g_ntohs(pflogh.action);
pflogh.dir = g_ntohs(pflogh.dir);
if (tree) {
ti = proto_tree_add_protocol_format(tree, proto_old_pflog, tvb, 0,
OLD_PFLOG_HDRLEN,
"PF Log (pre 3.4) %s %s on %s by rule %d",
val_to_str(pflogh.af, af_vals, "unknown (%u)"),
val_to_str(pflogh.action, action_vals, "unknown (%u)"),
pflogh.ifname,
pflogh.rnr);
pflog_tree = proto_item_add_subtree(ti, ett_pflog);
proto_tree_add_uint(pflog_tree, hf_old_pflog_af, tvb,
offsetof(struct old_pfloghdr, af), sizeof(pflogh.af),
pflogh.af);
proto_tree_add_int(pflog_tree, hf_old_pflog_rnr, tvb,
offsetof(struct old_pfloghdr, rnr), sizeof(pflogh.rnr),
pflogh.rnr);
proto_tree_add_string(pflog_tree, hf_old_pflog_ifname, tvb,
offsetof(struct old_pfloghdr, ifname), sizeof(pflogh.ifname),
pflogh.ifname);
proto_tree_add_uint(pflog_tree, hf_old_pflog_reason, tvb,
offsetof(struct old_pfloghdr, reason), sizeof(pflogh.reason),
pflogh.reason);
proto_tree_add_uint(pflog_tree, hf_old_pflog_action, tvb,
offsetof(struct old_pfloghdr, action), sizeof(pflogh.action),
pflogh.action);
proto_tree_add_uint(pflog_tree, hf_old_pflog_dir, tvb,
offsetof(struct old_pfloghdr, dir), sizeof(pflogh.dir),
pflogh.dir);
}
/* Set the tvbuff for the payload after the header */
next_tvb = tvb_new_subset(tvb, OLD_PFLOG_HDRLEN, -1, -1);
switch (pflogh.af) {
case BSD_PF_INET:
call_dissector(ip_handle, next_tvb, pinfo, tree);
break;
case BSD_PF_INET6:
call_dissector(ipv6_handle, next_tvb, pinfo, tree);
break;
default:
call_dissector(data_handle, next_tvb, pinfo, tree);
break;
}
if (check_col(pinfo->cinfo, COL_INFO)) {
col_prepend_fstr(pinfo->cinfo, COL_INFO, "[%s %s/#%d] ",
val_to_str(pflogh.action, action_vals, "unknown (%u)"),
pflogh.ifname,
pflogh.rnr);
}
}
void
proto_register_old_pflog(void)
{
static hf_register_info hf[] = {
{ &hf_old_pflog_af,
{ "Address Family", "pflog.af", FT_UINT32, BASE_DEC, VALS(af_vals), 0x0,
"Protocol (IPv4 vs IPv6)", HFILL }},
{ &hf_old_pflog_ifname,
{ "Interface", "pflog.ifname", FT_STRING, BASE_NONE, NULL, 0x0,
"Interface", HFILL }},
{ &hf_old_pflog_rnr,
{ "Rule Number", "pflog.rnr", FT_INT16, BASE_DEC, NULL, 0x0,
"Last matched firewall rule number", HFILL }},
{ &hf_old_pflog_reason,
{ "Reason", "pflog.reason", FT_UINT16, BASE_DEC, VALS(reason_vals), 0x0,
"Reason for logging the packet", HFILL }},
{ &hf_old_pflog_action,
{ "Action", "pflog.action", FT_UINT16, BASE_DEC, VALS(action_vals), 0x0,
"Action taken by PF on the packet", HFILL }},
{ &hf_old_pflog_dir,
{ "Direction", "pflog.dir", FT_UINT16, BASE_DEC, VALS(old_dir_vals), 0x0,
"Direction of packet in stack (inbound versus outbound)", HFILL }},
};
static gint *ett[] = { &ett_old_pflog };
proto_old_pflog = proto_register_protocol(
"OpenBSD Packet Filter log file, pre 3.4",
"PFLOG-OLD", "pflog-old");
proto_register_field_array(proto_old_pflog, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_old_pflog(void)
{
dissector_handle_t pflog_handle;
ip_handle = find_dissector("ip");
ipv6_handle = find_dissector("ipv6");
data_handle = find_dissector("data");
pflog_handle = create_dissector_handle(dissect_old_pflog, proto_old_pflog);
dissector_add("wtap_encap", WTAP_ENCAP_OLD_PFLOG, pflog_handle);
}
View Git Blame Copy Permalink