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netlink: decode libudev netlink header

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* defs.h (decode_netlink_kobject_uevent): New prototype.
* netlink.c (decode_netlink): Decode family kobject_uevent.
* netlink_kobject_uevent.h: New file.
* netlink_kobject_uevent.c: Likewise.
* Makefile.am (strace_SOURCES): Add them.

Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>
Signed-off-by: Harsha Sharma <harshasharmaiitr@gmail.com>
This commit is contained in:
Harsha Sharma 2018-03-03 16:41:43 +05:30 committed by Dmitry V. Levin
parent d94871775a
commit c9694f85ed
5 changed files with 89 additions and 1 deletions
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2
Makefile.am
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@ -204,6 +204,8 @@ strace_SOURCES = \
netlink.c \
netlink.h \
netlink_crypto.c \
netlink_kobject_uevent.c \
netlink_kobject_uevent.h \
netlink_sock_diag.h \
netlink_inet_diag.c \
netlink_netfilter.c \

4
defs.h
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@ -744,6 +744,10 @@ DECL_NETLINK(route);
DECL_NETLINK(selinux);
DECL_NETLINK(sock_diag);
extern void
decode_netlink_kobject_uevent(struct tcb *, kernel_ulong_t addr,
kernel_ulong_t len);
extern int ts_nz(const struct timespec *);
extern int ts_cmp(const struct timespec *, const struct timespec *);
extern double ts_float(const struct timespec *);

2
netlink.c
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@ -631,7 +631,7 @@ decode_netlink(struct tcb *const tcp,
const int family = get_fd_nl_family(tcp, fd);
if (family == NETLINK_KOBJECT_UEVENT) {
printstrn(tcp, addr, len);
decode_netlink_kobject_uevent(tcp, addr, len);
return;
}

65
netlink_kobject_uevent.c Normal file
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@ -0,0 +1,65 @@
/*
* Copyright (c) 2018 Harsha Sharma <harshasharmaiitr@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"
#include "print_fields.h"
#include "netlink_kobject_uevent.h"
#include <arpa/inet.h>
void
decode_netlink_kobject_uevent(struct tcb *tcp, kernel_ulong_t addr,
kernel_ulong_t len)
{
struct udev_monitor_netlink_header uh;
const char *prefix = "libudev";
unsigned int offset = sizeof(uh);
if (!verbose(tcp) || (exiting(tcp) && syserror(tcp)) ||
!addr || len < offset || umove(tcp, addr, &uh) ||
strcmp(uh.prefix, prefix) != 0) {
printstrn(tcp, addr, len);
return;
}
PRINT_FIELD_CSTRING("{{", uh, prefix);
tprintf(", magic=htonl(%#x)", ntohl(uh.magic));
PRINT_FIELD_U(", ", uh, header_size);
PRINT_FIELD_U(", ", uh, properties_off);
PRINT_FIELD_U(", ", uh, properties_len);
tprintf(", filter_subsystem_hash=htonl(%#x)", ntohl(uh.filter_subsystem_hash));
tprintf(", filter_devtype_hash=htonl(%#x)", ntohl(uh.filter_devtype_hash));
tprintf(", filter_tag_bloom_hi=htonl(%#x)", ntohl(uh.filter_tag_bloom_hi));
tprintf(", filter_tag_bloom_lo=htonl(%#x)", ntohl(uh.filter_tag_bloom_lo));
tprints("}");
if (len > offset) {
tprints(", ");
printstrn(tcp, addr + offset, len - offset);
}
tprints("}");
}

17
netlink_kobject_uevent.h Normal file
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@ -0,0 +1,17 @@
#ifndef STRACE_NETLINK_KOBJECT_UEVENT_H
#define STRACE_NETLINK_KOBJECT_UEVENT_H
struct udev_monitor_netlink_header {
/* "libudev" prefix to distinguish libudev and kernel messages */
char prefix[8];
unsigned int magic;
unsigned int header_size;
unsigned int properties_off;
unsigned int properties_len;
unsigned int filter_subsystem_hash;
unsigned int filter_devtype_hash;
unsigned int filter_tag_bloom_hi;
unsigned int filter_tag_bloom_lo;
};
#endif /* !STRACE_NETLINK_KOBJECT_UEVENT_H */