glebfm/strace
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

netlink: add a basic rtnetlink parser of link messages

Browse Source 
* netlink_route.h: New file.
* rtnl_link.c: Likewise.
* Makefile.am (strace_SOURCES): Add them.
* defs.h (arp_hardware_types, iffflags): New xlat prototypes.
* netlink_route.c: Include "netlink_route.h"
and <linux/rtnetlink.h>.
(netlink_route_decoder_t): New typedef.
(route_decoders): New array.
(decode_netlink_route): Use it.

Co-authored-by: Fabien Siron <fabien.siron@epita.fr>
This commit is contained in:
JingPiao Chen 2017-06-16 21:11:23 +08:00 committed by Dmitry V. Levin
parent 4c437e1856
commit b955f683f4
5 changed files with 128 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Makefile.am
View File

@ -194,6 +194,7 @@ strace_SOURCES = \
netlink_netlink_diag.c \
netlink_packet_diag.c \
netlink_route.c \
netlink_route.h \
netlink_selinux.c \
netlink_smc_diag.c \
netlink_sock_diag.c \
@ -246,6 +247,7 @@ strace_SOURCES = \
rt_sigframe.c \
rt_sigreturn.c \
rtc.c \
rtnl_link.c \
sched.c \
sched_attr.h \
scsi.c \

2
defs.h
View File

@ -284,11 +284,13 @@ struct tcb {
#include "xlat.h"
extern const struct xlat addrfams[];
extern const struct xlat arp_hardware_types[];
extern const struct xlat at_flags[];
extern const struct xlat clocknames[];
extern const struct xlat dirent_types[];
extern const struct xlat ethernet_protocols[];
extern const struct xlat evdev_abs[];
extern const struct xlat iffflags[];
extern const struct xlat inet_protocols[];
extern const struct xlat msg_flags[];
extern const struct xlat netlink_protocols[];

24
netlink_route.c
View File

@ -29,6 +29,9 @@
#include "defs.h"
#include "netlink.h"
#include "netlink_route.h"
#include <linux/rtnetlink.h>
#include "xlat/nl_route_types.h"
@ -46,6 +49,15 @@ decode_family(struct tcb *const tcp, const uint8_t family,
tprints("}");
}
typedef DECL_NETLINK_ROUTE_DECODER((*netlink_route_decoder_t));
static const netlink_route_decoder_t route_decoders[] = {
[RTM_DELLINK - RTM_BASE] = decode_ifinfomsg,
[RTM_GETLINK - RTM_BASE] = decode_ifinfomsg,
[RTM_NEWLINK - RTM_BASE] = decode_ifinfomsg,
[RTM_SETLINK - RTM_BASE] = decode_ifinfomsg
};
bool
decode_netlink_route(struct tcb *const tcp,
const struct nlmsghdr *const nlmsghdr,
@ -57,8 +69,16 @@ decode_netlink_route(struct tcb *const tcp,
if (nlmsghdr->nlmsg_type == NLMSG_DONE)
return false;
if (!umove_or_printaddr(tcp, addr, &family))
decode_family(tcp, family, addr, len);
if (!umove_or_printaddr(tcp, addr, &family)) {
const unsigned int index = nlmsghdr->nlmsg_type - RTM_BASE;
if (index < ARRAY_SIZE(route_decoders)
&& route_decoders[index]) {
route_decoders[index](tcp, nlmsghdr, family, addr, len);
} else {
decode_family(tcp, family, addr, len);
}
}
return true;
}

44
netlink_route.h Normal file
View File

@ -0,0 +1,44 @@
/*
* Copyright (c) 2016 Fabien Siron <fabien.siron@epita.fr>
* Copyright (c) 2017 JingPiao Chen <chenjingpiao@gmail.com>
* Copyright (c) 2016-2017 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.
*/
#ifndef STRACE_NETLINK_ROUTE_H
#define STRACE_NETLINK_ROUTE_H
#define DECL_NETLINK_ROUTE_DECODER(route_decode_name) \
void \
route_decode_name(struct tcb *tcp, \
const struct nlmsghdr *nlmsghdr, \
uint8_t family, \
kernel_ulong_t addr, \
unsigned int len) \
/* End of DECL_NETLINK_ROUTE_DECODER definition. */
extern DECL_NETLINK_ROUTE_DECODER(decode_ifinfomsg);
#endif /* !STRACE_NETLINK_ROUTE_H */

58
rtnl_link.c Normal file
View File

@ -0,0 +1,58 @@
/*
* Copyright (c) 2016 Fabien Siron <fabien.siron@epita.fr>
* Copyright (c) 2017 JingPiao Chen <chenjingpiao@gmail.com>
* Copyright (c) 2016-2017 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"
#include "netlink_route.h"
#include "print_fields.h"
#include <linux/rtnetlink.h>
DECL_NETLINK_ROUTE_DECODER(decode_ifinfomsg)
{
struct ifinfomsg ifinfo = { .ifi_family = family };
const size_t offset = sizeof(ifinfo.ifi_family);
PRINT_FIELD_XVAL("{", ifinfo, ifi_family, addrfams, "AF_???");
tprints(", ");
if (len >= sizeof(ifinfo)) {
if (!umoven_or_printaddr(tcp, addr + offset,
sizeof(ifinfo) - offset,
(void *) &ifinfo + offset)) {
PRINT_FIELD_XVAL("", ifinfo, ifi_type,
arp_hardware_types, "ARPHRD_???");
PRINT_FIELD_IFINDEX(", ", ifinfo, ifi_index);
PRINT_FIELD_FLAGS(", ", ifinfo, ifi_flags,
iffflags, "IFF_???");
PRINT_FIELD_X(", ", ifinfo, ifi_change);
}
} else
tprints("...");
tprints("}");
}