maint: fix ioctls_sym.sh premature termination

When the list of headers do not fit into the command line, xargs splits
it into several lists and then passes them to grep.  If no headers from
a list match the grep pattern, grep exits with a non-zero status that
causes xargs to exit with a non-zero status, too.

* maint/ioctls_sym.sh: Use "find -exec +" instead of xargs,
ignore its exit status.

tests: introduce NLMSG_ATTR macro

* tests/tests.h (NLMSG_ATTR): New macro.
* tests/nlattr.c (test_nlattr, test_nla_type): Use it.

netlink: pass NLMSG_DONE messages to family specific payload decoders

While many NLMSG_DONE messages indeed have payload containing
just one integer, there are exceptions. Handle this by passing
payloads of NLMSG_DONE messages to family specific netlink
payload decoders.

* netlink.c (print_nlmsghdr): Do not skip family detection
for nlmsg_type == NLMSG_DONE.
(decode_nlmsg_type): Skip family specific type decoders
for type == NLMSG_DONE.
(decode_nlmsg_flags): Skip family specific decoding of flags
for type == NLMSG_DONE.
(decode_netlink_sock_diag): Skip for nlmsg_type == NLMSG_DONE.

Unexport die_out_of_memory

Print more specific error diagnostics than a generic "Out of memory"
when an error happens outside xmalloc.c.

* defs.h (die_out_of_memory): Remove prototype.
* strace.c (strace_popen, init): Call perror_msg_and_die instead
of die_out_of_memory.
* unwind.c (unwind_tcb_init): Likewise.
* xmalloc.c (die_out_of_memory): Add static qualifier.

Check -s argument early

* util.c (printstr_ex): Move the check that -s argument
does not exceed -1U / 4 ...
* strace.c (init): ... here.
* tests/options-syntax.test: Check it.

Include "netlink.h" instead of <linux/netlink.h>

* net.c: Include "netlink.h" instead of <linux/netlink.h>.
* sockaddr.c: Likewise.
* tests/create_nl_socket.c: Likewise.
* tests/net-sockaddr.c: Likewise.
* tests/netlink_audit.c: Likewise.
* tests/netlink_generic.c: Likewise.
* tests/netlink_inet_diag.c: Likewise.
* tests/netlink_netfilter.c: Likewise.
* tests/netlink_route.c: Likewise.
* tests/netlink_selinux.c: Likewise.
* tests/netlink_xfrm.c: Likewise.
* tests/net-yy-netlink.c: Include "netlink.h" instead
of <linux/netlink.h>, remove fallback definition of NETLINK_SOCK_DIAG.
* tests/netlink_netlink_diag.c: Likewise.
* tests/netlink_protocol.c: Likewise.
* tests/netlink_sock_diag.c: Likewise.
* tests/netlink_unix_diag.c: Likewise.
* tests/nlattr.c: Likewise.

netlink: provide a fallback definition of NETLINK_SOCK_DIAG

Add a fallback definition of NETLINK_SOCK_DIAG to netlink.h
instead of adding these fallback definitions to every file.

* netlink.h: Provide a fallback definition of NETLINK_SOCK_DIAG.
* socketutils.c: Include "netlink.h" instead of <linux/netlink.h>,
remove fallback definition of NETLINK_SOCK_DIAG.

Update prctl ARCH_* constants

* xlat/archvals.in: Add ARCH_GET_CPUID and ARCH_SET_CPUID
introduced by linux kernel commit v4.12-rc1~153^2~2.

Update V4L2_* constants

* xlat/v4l2_buf_types.in: Add V4L2_BUF_TYPE_META_CAPTURE introduced
by linux kernel commit v4.12-rc1~85^2~71.
* xlat/v4l2_device_capabilities_flags.in: Add V4L2_CAP_META_CAPTURE
introduced by the same commit.
* xlat/v4l2_control_flags.in: Add V4L2_CTRL_FLAG_HAS_PAYLOAD,
V4L2_CTRL_FLAG_EXECUTE_ON_WRITE, and V4L2_CTRL_FLAG_MODIFY_LAYOUT
introduced by linux kernel commits v3.17-rc1~112^2~363,
v4.1-rc1~59^2~1^2~63, and v4.12-rc1~85^2~62, respectively.
* xlat/v4l2_control_types.in: Add V4L2_CTRL_TYPE_U8, V4L2_CTRL_TYPE_U16,
and V4L2_CTRL_TYPE_U32 introduced by linux kernel commits
v3.17-rc1~112^2~343 and v3.17-rc1~112^2~112.

Update SCTP_* constants

* xlat/socksctpoptions.in: Add SCTP_ENABLE_STREAM_RESET,
SCTP_RESET_STREAMS, SCTP_RESET_ASSOC, SCTP_ADD_STREAMS,
SCTP_RECONFIG_SUPPORTED, and SCTP_PR_STREAM_STATUS introduced
by linux kernel commits v4.11-rc1~124^2~387^2~1, v4.11-rc1~124^2~387^2,
v4.11-rc1~124^2~166^2~2, v4.11-rc1~124^2~166^2, v4.12-rc1~64^3~469^2,
and v4.12-rc1~64^3~276, respectively.

Update RTM_* constants

* xlat/nl_route_types.in: Add RTM_DELNETCONF introduced
by linux kernel commit v4.12-rc1~64^3~312^2~6.

Update NDIAG_SHOW_* constants

* linux/netlink_diag.h (NDIAG_SHOW_FLAGS): New constant introduced
by linux kernel commit v4.12-rc1~64^3~260.
* xlat/netlink_diag_show.in: Add it.

Update KEYCTL_* constants

* xlat/keyctl_commands.in: Add KEYCTL_RESTRICT_KEYRING introduced
by linux kernel commit v4.12-rc1~123^2~7^2~2^2~3.

Update ARPHRD_* constants

* xlat/arp_hardware_types.in: Add ARPHRD_VSOCKMON introduced
by linux kernel commit v4.12-rc1~129^2~118^2~2.

Update SO_* constants

* xlat/sockoptions.in: Add SO_MEMINFO, SO_INCOMING_NAPI_ID,
and SO_COOKIE introduced by linux kernel commits v4.12-rc1~64^3~389,
v4.12-rc1~64^3~341^2, and v4.12-rc1~64^3~221^2~1, respectively.

tests: check more corner cases of nlattr decoding

* tests/nlattr.c (test_nlattr): Check decoding in case of invalid
struct nlattr.nla_len.

tests: check decoding of netlink attribute

* tests/nlattr.c: New file.
* tests/gen_tests.in (nlattr): New entry.
* tests/pure_executables.list: Add nlattr.
* tests/.gitignore: Likewise.

netlink: introduce a basic netlink attributes parser

* linux/unix_diag.h (UNIX_DIAG_*): New enum.
* nlattr.c: New file.
* nlattr.h: Likewise.
* Makefile.am (strace_SOURCES): Add them.
* netlink_sock_diag.c: Include "nlattr.h" and "xlat/unix_diag_attrs.h".
(decode_unix_diag_msg): Use decode_nlattr.
* xlat/unix_diag_attrs.in: New file.

Co-authored-by: Fabien Siron <fabien.siron@epita.fr>

netlink: introduce netlink.h

* netlink.h: New file.
* Makefile.am (strace_SOURCES): Add it.
* netlink_sock_diag.c: Include "netlink.h",
remove <sys/socket.h> and <linux/netlink.h>.
* netlink.c: Likewise.
(NLMSG_HDRLEN): Move to netlink.h.
* tests/netlink_protocol.c: Replace <linux/netlink.h> with "netlink.h".
* tests/netlink_sock_diag.c: Likewise.

tests: add SET_STRUCT macro to tests.h

* tests/netlink_sock_diag.c (INIT_STRUCT): Rename to SET_STRUCT,
all callers updated.  Move ...
* tests/tests.h: ... here.

tests: fix potential unaligned access in netlink_sock_diag.test

Despite our efforts made to avoid unaligned access, gcc appears to be
generating instructions that might cause unaligned access when copying
structures to unaligned addresses.

Fix this issue by replacing copying of structures to unaligned addresses
with memcpy calls.

* tests/netlink_sock_diag.c (INIT_STRUCT): New macro.
(test_odd_family_req, test_odd_family_msg, test_unix_diag_req,
test_unix_diag_msg, test_netlink_diag_req, test_netlink_diag_msg,
test_packet_diag_req, test_packet_diag_msg, test_inet_diag_sockid,
test_inet_diag_req, test_inet_diag_req_v2, test_inet_diag_msg,
test_smc_diag_req, test_smc_diag_msg): Use it to initialize potentially
unaligned struct nlmsghdr.  Do not access nlh->nlmsg_len.

tests: check decoding of NETLINK_GENERIC message types

* tests/netlink_generic.c: New file.
* tests/gen_tests.in (netlink_generic): New entry.
* tests/pure_executables.list: Add netlink_generic.
* tests/.gitignore: Likewise.

Signed-off-by: Masatake YAMATO <yamato@redhat.com>
Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>

netlink: add decoding of NETLINK_GENERIC protocol families

NETLINK_GENERIC is a protocol stacked on netlink protocol.

When a NETLINK_GENERIC subsystem registers its "family" name in the
kernel at run time, an integer value associated with this name is
assigned by the kernel.  This integer value is specified in struct
nlmsghdr.nlmsg_type of subsequent communications with the
NETLINK_GENERIC subsystem.

This change implements decoding of NETLINK_GENERIC message types in
symbolic form, for example:

  $ ./strace -yy -e 'sendto' ip tcp_metrics > /dev/null
  sendto(4<NETLINK:[GENERIC:12345]>, {{len=20, type=tcp_metrics, ...
  +++ exited with 0 +++

Note that type= specifying the NETLINK_GENERIC protocol family
is decoded properly.

* netlink.c (decode_nlmsg_type_generic): New function.
(nlmsg_types): Add NETLINK_GENERIC entry.

Signed-off-by: Masatake YAMATO <yamato@redhat.com>
Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>

socketutils: build a dynamic xlat table for NETLINK_GENERIC decoding

* configure.ac (AC_CHECK_HEADERS): Add linux/genetlink.h.
* defs.h (genl_families_xlat): New prototype.
* socketutils.c [HAVE_LINUX_GENETLINK_H]: Include <linux/genetlink.h>.
[HAVE_LINUX_GENETLINK_H] (genl_send_dump_families,
genl_parse_families_response): New helper functions.
(genl_families_xlat): New function for building the xlat table
for NETLINK_GENERIC decoding.

Signed-off-by: Masatake YAMATO <yamato@redhat.com>
Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>

dyxlat: new interface for building xlat tables dynamically

xlat tables are usually generated at build time.

printxval is suitable for printing struct nlmsghdr.nlmsg_type for
NETLINK_GENERIC protocol.  However, the corresponding xlat table
cannot be defined at build time because the values are registered
by the kernel at run time.

This change introduces dyxlat functions for building xlat tables
dynamically.  The primary use case is decoding nlmsg_type but this
interface can be used for other purposes.

* defs.h (struct dyxlat): New opaque data type.
(dyxlat_alloc, dyxlat_free, dyxlat_add_pair): New function declarations.
* dyxlat.c: New file.
* Makefile.am (strace_SOURCES): Add it.

Signed-off-by: Masatake YAMATO <yamato@redhat.com>
Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>

Introduce xstrndup function

* configure.ac (AC_CHECK_FUNCS): Add strndup.
* defs.h (xstrndup): New prototype.
* xmalloc.c (xstrndup): New function.

Signed-off-by: Masatake YAMATO <yamato@redhat.com>
Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>

netlink: do not print extra braces around payloadless nlmsghdr

* netlink.c (decode_nlmsghdr_with_payload): Print braces before
print_nlmsghdr and after decode_payload iff decode_payload is invoked.
* tests/netlink_audit.c (test_nlmsg_type): Update expected output.
* tests/netlink_netfilter.c: Likewise.
* tests/netlink_selinux.c: Likewise.
* tests/netlink_protocol.c (send_query): Likewise.
* tests/netlink_route.c (test_nlmsg_type, test_nlmsg_flags): Likewise.
* tests/netlink_sock_diag.c: Likewise.
* tests/netlink_xfrm.c: Likewise.

Strip argument name of type "struct tcb *" from function prototypes

"struct tcb *" was used in most prototypes along with "struct tcb *tcp",
this change converts the latter form to the former for consistency.

Fix a few spacing style issues

Reported by kernel's checkpatch.pl script.

Strip redundant trailing semicolons

Strip trailing semicolons from macro definitions.
Strip extra semicolons from statements terminations.

Reported by kernel's checkpatch.pl script.

Fix macros encosure in a do/while loop

Enclose macros with multiple statements and macros starting
with "if" statement in a do/while loop.
Do not enclose single statement macros in a do/while loop.

Reported by kernel's checkpatch.pl script.

Use __func__ instead of gcc specific __FUNCTION__

Reported by kernel's checkpatch.pl script.

Fix a few initialization style issues

Do not initialise statics and globals to 0, NULL, or false.

Reported by kernel's checkpatch.pl script.

Fix function prototypes with unspecified arguments

Change functions declared as taking unspecified number of arguments
of unspecified type to functions that take no arguments.

Reported by kernel's checkpatch.pl script.

Fix a few sizeof style issues

Reported by kernel's checkpatch.pl script.

Fix a few misspellings in comments

Reported by kernel's checkpatch.pl script.

print_mreq: remove superfluous print_quoted_string calls

The string returned by inet_ntoa(3) has IPv4 dotted-decimal notation,
no need to quote it.

* net.c (print_mreq): Remove print_quoted_string calls.

tests: check decoding of incomplete SCM_TIMESTAMP* control messages

* tests/msg_control.c (test_scm_timestamp, test_scm_timestampns,
test_scm_timestamping): Check decoding of incomplete control messages.

msghdr: print SCM_TIMESTAMP* control messages

Add support for printing control messages containing software and/or
hardware timestamps, which are typically enabled by NTP and PTP
implementations.

* print_timeval.c (print_struct_timeval_data_size): New mpers printer.
* print_timespec.c (print_struct_timespec_data_size,
print_struct_timespec_array_data_size): Likewise.
* msghdr.c (print_scm_timestamp, print_scm_timestampns,
print_scm_timestamping): New functions.
(cmsg_socket_printers): Add them.
* NEWS: Mention this change.
* tests/msg_control.c: Include "xlat.h" and "xlat/scmvals.h".
(test_scm_timestamp, test_scm_timestampns, test_scm_timestamping):
New functions.
(test_sol_socket): Use them.

Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>

tests: check decoding of NETLINK_SOCK_DIAG AF_SMC messages

* tests/netlink_sock_diag.c: Include <linux/smc_diag.h>.
(SMC_ACTIVE): New macro.
(test_smc_diag_req, test_smc_diag_msg): New functions.
(main): Use them.

netlink: add a basic socket diag parser of AF_SMC messages

* linux/smc_diag.h: New file.
* Makefile.am (EXTRA_DIST): Add it.
* netlink_sock_diag.c: Include <linux/smc_diag.h>,
"xlat/smc_diag_extended_flags.h" and "xlat/smc_states.h".
(decode_smc_diag_req, decode_smc_diag_msg): New functions.
(diag_decoders): Add AF_SMC.
* xlat/smc_diag_extended_flags.in: New file.
* xlat/smc_states.in: Likewise.

tests: check decoding of NETLINK_SOCK_DIAG AF_INET messages

* tests/netlink_sock_diag.c: Include <arpa/inet.h>
and <linux/inet_diag.h>.
(test_inet_diag_sockid, test_inet_diag_req, test_inet_diag_req_v2,
test_inet_diag_msg): New functions.
(mian): Use them.

Co-authored-by: Fabien Siron <fabien.siron@epita.fr>

netlink: add a basic socket diag parser of AF_INET and AF_INET6 messages

* defs.h (inet_protocols): New xlat prototype.
* linux/inet_diag.h (inet_diag_req): New structure.
(INET_DIAG_*): New enum.
* netlink_sock_diag.c: Include <arpa/inet.h>, <linux/inet_diag.h>
and "xlat/inet_diag_extended_flags.h".
(print_inet_diag_sockid, decode_inet_diag_req_compat)
(decode_inet_diag_req_v2, decode_inet_diag_req)
(decode_inet_diag_msg): New functions.
(diag_decoders): Add AF_INET and AF_INET6;
* xlat/inet_diag_extended_flags.in: New file.

Co-authored-by: Fabien Siron <fabien.siron@epita.fr>

Introduce print_inet_addr

* defs.h (print_inet_addr): New prototype.
* sockaddr.c (print_inet_addr): New function.
(print_sockaddr_data_in6): Use it.
* net.c (print_mreq6): Likewise.
* tests/ip_mreq.c (main): Update expected output.

tests: check decoding of NETLINK_SOCK_DIAG AF_PACKET messages

* tests/netlink_sock_diag.c: Include <linux/if_ether.h>
and <linux/packet_diag.h>.
(test_packet_diag_req, test_packet_diag_msg): New functions.
(main): Use them.

Co-authored-by: Fabien Siron <fabien.siron@epita.fr>

netlink: add a basic socket diag parser of AF_PACKET messages

* linux/packet_diag.h: New file.
* Makefile.am (EXTRA_DIST): Add it.
* defs.h (ethernet_protocols): New xlat prototype.
* netlink_sock_diag.c: Include <linux/packet_diag.h>
and "xlat/packet_diag_show.h".
(decode_packet_diag_req, decode_packet_diag_msg): New functions.
(diag_decoders): Add AF_PACKET.
* xlat/packet_diag_show.in: New file.

Co-authored-by: Fabien Siron <fabien.siron@epita.fr>

tests: check decoding of NETLINK_SOCK_DIAG AF_NETLINK messages

* tests/netlink_sock_diag.c: Include <linux/netlink_diag.h>.
(test_netlink_diag_req, test_netlink_diag_msg): New functions.
(main): Use them.

Co-authored-by: Fabien Siron <fabien.siron@epita.fr>

netlink: add a basic socket diag parser of AF_NETLINK messages

* linux/netlink_diag.h (NDIAG_SHOW_GROUPS, NDIAG_SHOW_RING_CFG):
New macros.
* netlink_sock_diag.c: Include <linux/netlink_diag.h>,
"xlat/netlink_diag_show.h" and "xlat/netlink_states.h".
(decode_netlink_diag_req, decode_netlink_diag_msg): New functions.
(diag_decoders): Add AF_NETLINK.
* xlat/netlink_diag_show.in: New file.
* xlat/netlink_states.in: Likewise.

Co-authored-by: Fabien Siron <fabien.siron@epita.fr>

tests: check decoding of NETLINK_SOCK_DIAG AF_UNIX messages

* tests/netlink_sock_diag.c: Include <netinet/tcp.h>
and <linux/unix_diag.h>.
(test_odd_family_req, test_odd_family_msg, test_unix_diag_req,
test_unix_diag_msg): New functions.
(main): Use them.

Co-authored-by: Fabien Siron <fabien.siron@epita.fr>
Co-authored-by: JingPiao Chen <chenjingpiao@gmail.com>

netlink: add a basic socket diag parser of AF_UNIX messages

* defs.h (socktypes): New xlat prototype.
* linux/unix_diag.h (UDIAG_SHOW_VFS, UDIAG_SHOW_ICONS, UDIAG_SHOW_RQLEN,
UDIAG_SHOW_MEMINFO): New macros.
* netlink_sock_diag.c: Include <sys/socket.h>, <linux/netlink.h>,
<linux/unix_diag.h>, "xlat/tcp_states.h", "xlat/tcp_state_flags.h",
and "xlat/unix_diag_show.h".
(decode_unix_diag_req, decode_unix_diag_msg): New functions.
(netlink_diag_decoder_t): New typedef.
(diag_decoders): New array.
(decode_netlink_sock_diag): Use it.
* xlat/tcp_state_flags.in: New file.
* xlat/tcp_states.in: Likewise.
* xlat/unix_diag_show.in: Likewise.

Co-authored-by: Fabien Siron <fabien.siron@epita.fr>
Co-authored-by: JingPiao Chen <chenjingpiao@gmail.com>

netlink: introduce family specific payload decoders

* defs.h (netlink_decoder_t): New typedef.
(DECL_NETLINK): New macro.
(decode_netlink_sock_diag): New prototype.
* netlink.c (netlink_decoders): New array.
(decode_payload): Use it to invoke netlink family specific decoders.
* netlink_sock_diag.c: New file.
* Makefile.am (strace_SOURCES): Add it.

Co-authored-by: Fabien Siron <fabien.siron@epita.fr>
Co-authored-by: JingPiao Chen <chenjingpiao@gmail.com>

Update SCM_* constants

* xlat/scmvals.in: Add SCM_TIMESTAMP, SCM_TIMESTAMPNS, SCM_TIMESTAMPING,
SCM_WIFI_STATUS, and SCM_TIMESTAMPING_OPT_STATS.

netlink: refactor decode_nlmsg_type

* netlink.c (decode_nlmsg_type_default, decode_nlmsg_type_netfilter):
New functions.
(nlmsg_types_decoder_t): New typedef.
(nlmsg_types): Add decoder field.
(decode_nlmsg_type): Use it.

tests: extend printstr test

* tests/printstr.c (main): Add a case for short read.

v4l2: fix preprocessor checks

Fix checks for struct v4l2_window.global_alpha and struct
v4l2_sdr_format.buffersize.

* v4l2.c (print_v4l2_format_fmt): Do not assume that
HAVE_STRUCT_V4L2_WINDOW_GLOBAL_ALPHA and
HAVE_STRUCT_V4L2_SDR_FORMAT_BUFFERSIZE are defined.
* tests/ioctl_v4l2.c (init_v4l2_format, dprint_ioctl_v4l2): Likewise.

Move xlat related functions to a separate file

* util.c (xlookup, xlat_bsearch_compare, xlat_search, printxvals,
printxval_searchn, addflags, sprintflags, printflags_ex): Move ...
* xlat.c: ... to this new file.
* Makefile.am (strace_SOURCES): Add it.

socketeutils: extend receive_responses further

This is the second patch in series of implementing NETLINK_GENERIC
protocol decoder.

This change allows passing of opaque user data to the callback function.

* socketutils.c (receive_responses): Change the type of proto_name
argument from "const char *" to "void *" to allow passing
of arbitrary data to the callback function.
Rename proto_name to opaque_data, make it the last argument.
Pass it to the callback function as the last argument.
(inet_parse_response, unix_parse_response, netlink_parse_response):
Change the type of proto_name argument from "const char *" to "void *",
rename it to opaque_data, make it the last argument.
Introduce a local variable proto_name to convert the type
of opaque_data argument from "void *" to "const char *".
(unix_get, inet_get, netlink_get): Cast the protocol name from
"const char *" to "void *" for passing to the callback function.

Signed-off-by: Masatake YAMATO <yamato@redhat.com>
Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>

socketeutils: extend receive_responses to handle other netlink types

This is the first patch in series of implementing NETLINK_GENERIC
protocol decoder.

receive_responses was written for decoding kernel responses of type
SOCK_DIAG_BY_FAMILY, other types were ignored.

This change makes the type of netlink response a parameter
so the function can be used for other types of communication.

* socketutils.c (receive_responses): add a new parameter
expected_msg_type to handle types other than SOCK_DIAG_BY_FAMILY.

Signed-off-by: Masatake YAMATO <yamato@redhat.com>
Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>

tests: fix typo

* tests/dup3.c (SKIP_MAIN_UNDEFINED): Remove duplicated &&.

Introduce printflags_ex function

Add printflags_ex extension over printflags64 that, similar
to printxvals, takes a NULL-terminated sequence of xlat pointers.

* defs.h (printflags_ex): New prototype.
(printflags64): Turn into a thin wrapper around printflags_ex.
* netlink.c (decode_nlmsg_flags): Use printflags_ex.
* util.c (printflags_ex): New function.
(printflags64): Remove.
* xlat/netlink_get_flags.in: Remove entries listed
in xlat/netlink_flags.in file.
* xlat/netlink_new_flags.in: Likewise.

tests: add check for decoding netlink get and new flags

* tests/netlink_route.c (test_nlmsg_flags): New function, checks
decoding of NETLINK_ROUTE get and new flags.
(main): Use it.
* tests/netlink_sock_diag.c (test_nlmsg_flags): New function, checks
decoding of NETLINK_SOCK_DIAG get flags.
(main): Use it.
* tests/netlink_xfrm.c: (test_nlmsg_flags): New function, checks
decoding of NETLINK_XFRM get and new flags.
(main): Use it.

netlink: implement generic nlmsg_flags decoding

* netlink.c: Include "xlat/netlink_get_flags.h"
and "xlat/netlink_new_flags.h".
(decode_nlmsg_flags): New function.
(print_nlmsghdr): Use it.
* xlat/netlink_get_flags.in: New file.
* xlat/netlink_new_flags.in: Likewise.

Co-authored-by: Fabien Siron <fabien.siron@epita.fr>
Co-authored-by: Dmitry V. Levin <ldv@altlinux.org>

xlat: provide fallback definitions for XFRM_MSG_* constants

Some of XFRM_MSG_* constants were introduced later than the header file
where they are defined.

* xlat/nl_xfrm_types.in: Add default values for constants.

syscall.c: split trace_syscall() into 6 functions

This change removes the trace_syscall function.  Now, the code that uses
syscall.c trace functions is expected to check whether it is a syscall
entry or exit (with entering(tcp)/exiting(tcp)) itself, and then make
an appropriate sequence of function calls.

* defs.h: Update comment on TCB_INSYSCALL.
(trace_syscall): Remove prototype.
(syscall_entering_decode, syscall_entering_trace,
syscall_entering_finish, syscall_exiting_decode, syscall_exiting_trace,
syscall_exiting_finish): New prototypes.
* strace.c (trace_syscall): New static replacement for old trace_syscall.
* syscall.c (trace_syscall): Remove.
(trace_syscall_entering): Split into ...
(syscall_entering_decode, syscall_entering_trace,
syscall_entering_finish): ... new functions.
(trace_syscall_exiting): Split into ...
(syscall_exiting_decode, syscall_exiting_trace,
syscall_exiting_finish): ... new functions.

tests: guard against missing linux/netfilter/nfnetlink.h

nfnetlink was introduced in linux by commit v2.6.14-rc1~1035^2~217,
add a guard for the case when system headers are not fresh enough.

* configure.ac (AC_CHECK_HEADERS): Add linux/netfilter/nfnetlink.h.
* tests/netlink_netfilter.c: Check for HAVE_LINUX_NETFILTER_NFNETLINK_H.

tests: check decoding of NETLINK_XFRM message types

* tests/netlink_xfrm.c: New file.
* tests/gen_tests.in (netlink_xfrm): New entry.
* tests/pure_executables.list: Add netlink_xfrm.
* tests/.gitignore: Likewise.

tests: check decoding of NETLINK_SELINUX message types

* tests/netlink_selinux.c: New file.
* tests/gen_tests.in (netlink_selinux): New entry.
* tests/pure_executables.list: Add netlink_selinux.
* tests/.gitignore: Likewise.

tests: check decoding of NETLINK_NETFILTER message types

* tests/netlink_netfilter.c: New file.
* tests/gen_tests.in (netlink_netfilter): New entry.
* tests/pure_executables.list: Add netlink_netfilter.
* tests/.gitignore: Likewise.

tests: check decoding of NETLINK_AUDIT message types

* tests/netlink_audit.c: New file.
* tests/gen_tests.in (netlink_audit): New entry.
* tests/pure_executables.list: Add netlink_audit.
* tests/.gitignore: Likewise.

tests: check decoding of NETLINK_ROUTE message types

* tests/netlink_route.c: New file.
* tests/gen_tests.in (netlink_route): New entry.
* tests/pure_executables.list: Add netlink_route.
* tests/.gitignore: Likewise.

tests: check decoding of NETLINK_SOCK_DIAG message types

* tests/netlink_sock_diag.c: New file.
* tests/netlink_sock_diag.test: New test.
* tests/pure_executables.list: Add netlink_sock_diag.
* tests/.gitignore: Likewise.
* tests/Makefile.am (DECODER_TESTS): Add netlink_sock_diag.test.

tests: use create_nl_socket in netlink_protocol.test

* tests/netlink_protocol.c (main): Use create_nl_socket.

tests: change netlink_protocol.test to trace sendto syscalls only

* tests/gen_tests.in (netlink_protocol): Replace %network with sendto.
* tests/netlink_protocol.c (main): Update expected output.

tests: enhance create_nl_socket diagnostics messages

* tests/tests.h (create_nl_socket): Rename to create_nl_socket_ext,
add a string argument.
(create_nl_socket): New macro wrapper around create_nl_socket_ext.
* tests/create_nl_socket.c (create_nl_socket): Rename
to create_nl_socket_ext, add a string argument, include it
in diagnostic messages.

tests: use const and designated initializers in create_nl_socket.c

* tests/create_nl_socket.c: Stop including <string.h>.
(create_nl_socket): Use const and designated initializers.

tests: add create_nl_socket function to libtests

* tests/create_nl_socket.c: New file.
* tests/tests.h (create_nl_socket): New prototype.
* tests/Makefile.am (libtests_a_SOURCES): Add create_nl_socket.c.

netlink: add decoding of NETLINK_NETFILTER message types

* xlat/nl_netfilter_msg_types.in: New file.
* xlat/nl_netfilter_subsys_ids.in: Likewise.
* netlink.c: Include "xlat/nl_netfilter_msg_types.h"
and "xlat/nl_netfilter_subsys_ids.h".
(nlmsg_types): Add NETLINK_NETFILTER.
(decode_nlmsg_type): Handle NETLINK_NETFILTER.

Co-authored-by: Fabien Siron <fabien.siron@epita.fr>

netlink: add decoding of NETLINK_XFRM message types

* xlat/nl_xfrm_types.in: New file.
* netlink.c: Include "xlat/nl_xfrm_types.h".
(nlmsg_types): Add NETLINK_XFRM.

Co-authored-by: Fabien Siron <fabien.siron@epita.fr>

netlink: add decoding of NETLINK_SELINUX message types

* xlat/nl_selinux_types.in: New file.
* netlink.c: Include "xlat/nl_selinux_types.h".
(nlmsg_types): Add NETLINK_SELINUX.

Co-authored-by: Fabien Siron <fabien.siron@epita.fr>

netlink: add decoding of NETLINK_ROUTE message types

* xlat/nl_route_types.in: New file.
* netlink.c: Include <linux/rtnetlink.h> and "xlat/nl_route_types.h".
(nlmsg_types): Add NETLINK_ROUTE.

Co-authored-by: Fabien Siron <fabien.siron@epita.fr>

netlink: add decoding of NETLINK_AUDIT message types

* xlat/nl_audit_types.in: New file.
* netlink.c: Include <linux/audit.h> and "xlat/nl_audit_types.h".
(nlmsg_types): Add NETLINK_AUDIT.

Co-authored-by: Fabien Siron <fabien.siron@epita.fr>

netlink: implement generic nlmsg_type decoding

Implement a pluggable mechanism of nlmsg_type decoding.
Add decoding of NETLINK_SOCK_DIAG types.

* linux/sock_diag.h (SOCK_DESTROY): New macro.
* xlat/nl_sock_diag_types.in: New file.
* netlink.c: Include xlat/nl_sock_diag_types.h.
(get_fd_nl_family, decode_nlmsg_type): New functions.
(print_nlmsghdr): Use them for nlmsg_type decoding.

Co-authored-by: Fabien Siron <fabien.siron@epita.fr>

netlink: add netlink family argument to printers and decoders

* netlink.c (NL_FAMILY_ERROR, NL_FAMILY_DEFAULT): New constants.
(print_nlmsghdr): Add netlink family argument, change return type
to int, return family.
(decode_nlmsghdr_with_payload, decode_nlmsgerr, decode_payload): Add
netlink family argument.  All callers updated.

Add file descriptor argument to decode_netlink

* defs.h (decode_netlink): Add file descriptor argument.
* io.c (print_iovec): Specify file descriptor to decode_netlink.
* net.c (decode_sockbuf): Likewise.
* netlink.c (print_nlmsghdr, decode_nlmsghdr_with_payload,
decode_nlmsgerr, decode_payload, decode_nlmsghdr_with_payload,
decode_netlink): Likewise.
All callers updated.

Co-authored-by: Dmitry V. Levin <ldv@altlinux.org>

Introduce getfdinode to obtain inode from fd

* defs.h (getfdinode): New prototype.
* utils.c (getfdinode): New function.

Co-authored-by: Dmitry V. Levin <ldv@altlinux.org>

Introduce get_sockaddr_by_inode

Add a way to get socket information without printing it.

* defs.h (get_sockaddr_by_inode): New prototype.
* socketutils.c (get_sockaddr_by_inode): New function.

Co-authored-by: Dmitry V. Levin <ldv@altlinux.org>

socketutils.c: introduce get_sockaddr_by_inode_uncached

* socketutils.c (get_sockaddr_by_inode_uncached): New function.
(print_sockaddr_by_inode_uncached): Use it.

socketutils.c: use get_sockaddr_by_inode_cached

* socketutils.c (unix_print, inet_print, tcp_v4_print, tcp_v6_print,
udp_v4_print, udp_v6_print, netlink_print): Remove.
(unix_get, inet_get, tcp_v4_get, tcp_v6_get, udp_v4_get,
udp_v6_get, netlink_get): New functions.
(protocols): Update.

Co-authored-by: Dmitry V. Levin <ldv@altlinux.org>

socketutils.c: move inet_print closer to its first use

* socketutils.c (inet_print): Move right before tcp_v4_print.

socketutils.c: introduce cache_inode_details

cache_inode_details gives a way to obtain cache information without
printing it.

* socketutils.c (cache_and_print_inode_details): Rename
to cache_inode_details.  Do not print cached information.
(inet_parse_response, unix_parse_response, netlink_parse_response):
Use cache_inode_details instead of cache_and_print_inode_details.
(inet_print, unix_print, netlink_print): Call
print_sockaddr_by_inode_cached.

Co-authored-by: Dmitry V. Levin <ldv@altlinux.org>

strace.c: move termination code to a separate function

This will be needed for the pull-style API.

* strace.c (terminate): New function.
(main): Use it.

tests: avoid hitting SO_SNDBUF limit in sendfile/sendfile64 tests

Do not assume that an executable is small enough and SO_SNDBUF is large
enough so that the executable could be sendfile'ed into a socket pair.

* tests/sendfile.c (main): Create a regular file of the right size
to avoid hitting SO_SNDBUF limit.
* tests/sendfile64.c: Likewise.

Reported-by: Andreas Schwab <schwab@linux-m68k.org>

Move netlink_protocols definition from net.c to netlink.c

The side effect of #include "xlat/netlink_protocols.h" is
NETLINK_* constants properly defined in that header file.
While net.c does not use these constants itself, netlink.c
is going to need them soon.

* net.c: Move inclusion of "xlat/netlink_protocols.h" ...
* netlink.c: ... here.

travis: switch from gcc-6 to gcc-7

* .travis.yml (matrix): Change gcc-6 to gcc-7.

tests: extend checking of NLMSG_DONE decoding

* tests/netlink_protocol.c (test_nlmsg_done):  Use designated
initializers.  Check decoding of messages with non-integer payload.

netlink: decode NLMSG_DONE messages

* netlink.c (decode_payload): Decode NLMSG_DONE messages.
* tests/netlink_protocol.c (test_nlmsg_done): New function
for checking decoding of NLMSG_DONE messages.
(main): Use it.

socketutils.c: introduce get_sockaddr_by_inode_cached

* socketutils.c (get_sockaddr_by_inode_cached): New function.
(print_sockaddr_by_inode_cached): Use it.

Unexport print_sockaddr_by_inode_cached

Change print_sockaddr_by_inode to be the only function exposed,
hide print_sockaddr_by_inode_cached as a part of implementation.

* defs.h (print_sockaddr_by_inode_cached): Remove prototype.
(print_sockaddr_by_inode): Add struct tcb * and descriptor arguments.
* socketutils.c (print_sockaddr_by_inode_cached): Make static.
(print_sockaddr_by_inode): Rename to print_sockaddr_by_inode_uncached,
make static.
(print_sockaddr_by_inode): New function.
* util.c (printfd): Update to use new print_sockaddr_by_inode.

Introduce str_strip_prefix_len function and STR_STRIP_PREFIX macro

Address proliferation of string prefix check implementations.

* defs.h (str_strip_prefix_len): New inline function.
(STR_STRIP_PREFIX): New macro.
* qualify.c (strip_prefix): Remove.
(parse_inject_token): Use STR_STRIP_PREFIX instead of strip_prefix.
(qualify): Use str_strip_prefix_len.
* socketutils.c (netlink_parse_response): Likewise.
* util.c (printfd): Likewise.

netlink: move NLMSG_ERROR payload length check to nlmsgerr decoder

Move decoder specific check to the decoder.

* netlink.c (decode_payload): Move NLMSG_ERROR payload length check ...
(decode_nlmsgerr): ... here.