strace/netlink_netfilter.c
Eugene Syromyatnikov 298f29a15b netlink_netfilter: use xlat styles for res_id workaround printing
* netlink_netfilter.c (decode_netlink_netfilter): Call print_xlat_ex
in order to respect xlat style setting.
2018-09-02 17:44:26 +00:00

102 lines
3.5 KiB
C

/*
* Copyright (c) 2018 Chen Jingpiao <chenjingpiao@gmail.com>
* Copyright (c) 2018 The strace developers.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
#include "defs.h"
#ifdef HAVE_LINUX_NETFILTER_NFNETLINK_H
# include "print_fields.h"
# include "nlattr.h"
# include <netinet/in.h>
# include <arpa/inet.h>
# include "netlink.h"
# include <linux/netfilter/nfnetlink.h>
# include "xlat/netfilter_versions.h"
# include "xlat/nl_netfilter_msg_types.h"
# include "xlat/nl_netfilter_subsys_ids.h"
bool
decode_netlink_netfilter(struct tcb *const tcp,
const struct nlmsghdr *const nlmsghdr,
const kernel_ulong_t addr,
const unsigned int len)
{
if (nlmsghdr->nlmsg_type == NLMSG_DONE)
return false;
struct nfgenmsg nfmsg;
if (len < sizeof(nfmsg))
printstr_ex(tcp, addr, len, QUOTE_FORCE_HEX);
else if (!umove_or_printaddr(tcp, addr, &nfmsg)) {
const uint8_t subsys_id = (uint8_t) (nlmsghdr->nlmsg_type >> 8);
uint16_t res_id = ntohs(nfmsg.res_id);
PRINT_FIELD_XVAL("{", nfmsg, nfgen_family, addrfams, "AF_???");
PRINT_FIELD_XVAL(", ", nfmsg, version, netfilter_versions,
"NFNETLINK_???");
/*
* Work around wrong endianness in res_id field,
* see linux commit v4.3-rc1~28^2~47^2~1
*/
tprints(", res_id=");
if (subsys_id == NFNL_SUBSYS_NFTABLES
&& res_id == NFNL_SUBSYS_NFTABLES) {
print_xlat_ex(nfmsg.res_id,
"htons(NFNL_SUBSYS_NFTABLES)",
XLAT_STYLE_DEFAULT);
} else if (subsys_id == NFNL_SUBSYS_NFTABLES
&& nfmsg.res_id == NFNL_SUBSYS_NFTABLES) {
print_xlat_ex(nfmsg.res_id, "NFNL_SUBSYS_NFTABLES",
XLAT_STYLE_DEFAULT);
} else {
tprintf("htons(%d)", res_id);
}
const size_t offset = NLMSG_ALIGN(sizeof(nfmsg));
if (len > offset) {
tprints(", ");
if ((nlmsghdr->nlmsg_type >= NFNL_MSG_BATCH_BEGIN
&& nlmsghdr->nlmsg_type <= NFNL_MSG_BATCH_END)
|| nlmsghdr->nlmsg_type < NLMSG_MIN_TYPE)
printstr_ex(tcp, addr + offset,
len - offset, QUOTE_FORCE_HEX);
else
decode_nlattr(tcp, addr + offset, len - offset,
NULL, NULL, NULL, 0, NULL);
}
}
return true;
}
#endif /* HAVE_LINUX_NETFILTER_NFNETLINK_H */