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resolved: support IPv6 DNS servers on the local link
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it (#3457)
Let's add an extra safety check before we chmod/chown a TTY to the right user,
as we might end up having connected something to STDIN/STDOUT that is actually
not a TTY, even though this might have been requested, due to permissive
StandardInput= settings or transient service activation with fds passed in.
Fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=85255
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put limits on addresses and routers per link and per network
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The changes in 788d2b088b13a2444b9eb2ea82c0cc57d9f0980f weren't complete, only
half the code that dealt with K links was removed. This is a follow-up patch
that removes the rest too.
No functional changes.
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-bash-4.3# rm /etc/udev/hwdb.bin
-bash-4.3# systemd-hwdb update
-bash-4.3# ls -Z /etc/udev/hwdb.bin
system_u:object_r:systemd_hwdb_etc_t:s0 /etc/udev/hwdb.bin
Fixes: #3458
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timestamping improvements and IPv6 RA revamp
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On larger systems we might very well see messages with thousands of parts.
When we free them, we must avoid recursing into each part, otherwise we
very likely get stack overflows.
Fix sd_netlink_message_unref() to use an iterative approach rather than
recursion (also avoid tail-recursion in case it is not optimized by the
compiler).
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As that's handled by "gpt-auto-generator".
Fixes: #3404
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Let's explain #3444 briefly in the sources, too.
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Without this code the following can happen:
1. Open a file to keep a mount busy
2. Try to stop the corresponding mount unit with systemctl
-> umount fails and the failure is remembered in mount->result
3. Close the file and umount the filesystem manually
-> mount_dispatch_io() calls "mount_enter_dead(mount, MOUNT_SUCCESS)"
-> Old error in mount->result is reused and the mount unit enters a
failed state
Clear the old error result when 'mountinfo' reports a successful umount to
fix this.
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This reworks sd-ndisc and networkd substantially to support IPv6 RA much more
comprehensively. Since the API is extended quite a bit networkd has been ported
over too, and the patch is not as straight-forward as one could wish. The
rework includes:
- Support for DNSSL, RDNSS and RA routing options in sd-ndisc and networkd. Two
new configuration options have been added to networkd to make this
configurable.
- sd-ndisc now exposes an sd_ndisc_router object that encapsulates a full RA
message, and has direct, friendly acessor functions for the singleton RA
properties, as well as an iterative interface to iterate through known and
unsupported options. The router object may either be retrieved from the wire,
or generated from raw data. In many ways the sd-ndisc API now matches the
sd-lldp API, except that no implicit database of seen data is kept. (Note
that sd-ndisc actually had a half-written, but unused implementaiton of such
a store, which is removed now.)
- sd-ndisc will now collect the reception timestamps of RA, which is useful to
make sd_ndisc_router fully descriptive of what it covers.
Fixes: #1079
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serializing
Let's use the usual libc API for serializing IPv6 addresses, instead of the
NDISC-specific macro we should get rid of anyway.
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After all, we use clockid_t which is defined there.
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sd-ndisc has something like this, let's add this for sd-lldp, too.
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It might very well return EAGAIN in case of packet checksum problems and
suchlike, hence let's better handle this nicely, the same way as we do it in
the other sd-network libraries for incoming datagrams.
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Let's make sure the inline functions for retrieving TLV data actually carry TLV
in the name, so that we don#t assume they retrieve the whole, raw packet data.
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This way it's nicer to use as it matches how sd_lldp_neighbor_tlv_next()
indicates an EOF too via its return value.
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Let's simply encode this in the parameter name.
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setting the ifindex
Let's make sd-lldp a bit more like sd-ndisc ant the other APIs, and add proper
ref counting and a separate call for setting the ifindex.
This also adds a new lldp_reset() call we can use at various places to close
all fds. This is also similar to how sd-ndisc already does it.
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It's a good idea to store away the recption time of LLDP packets in the
neighbor object, simply because the LLDP data only has a validity of a certain
amount of time.
Hence, let's record the timestamp when we receive the datagram and expose an
API for it. Also, automatically expire LLDP neighbors based on this new
timestamp.
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We already have a double timestamp object that we use whenever we need both a
MONOTONIC and a REALTIME timestamp taken and stored. With this change we
also add a triple timestamp object that in addition stores a BOOTTIME
timestamp, which is useful for a few usecases.
Note that we keep dual_timestamp around, as it is useful in many cases where
triple_timestamp is not, in particular because retrieving the monotonic and
realtime timestamps is much cheaper on Linux that getting the boottime
timestamp.
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changed via bus calls
This also moves log message generation into manager_write_resolv_conf(), so
that it is shorter to invoke the function, given that we have to invoke it at a
couple of additional places now.
Fixes: #3225
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Make sure we can parse DNS server addresses that use the "zone id" syntax for
local link addresses, i.e. "fe80::c256:27ff:febb:12f%wlp3s0", when reading
/etc/resolv.conf.
Also make sure we spit this out correctly again when writing /etc/resolv.conf
and via the bus.
Fixes: #3359
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this patch solves the following waring:
../src/network/networkd-ndisc.c:197:13: warning: unused variable ‘r’
[-Wunused-variable]
int r;
fixes acac5b2f
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When many services are running, it was difficult to see only the interesting ones.
This patch allows to show only the subtree of interest.
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This basically reverts 7b2fd9d51259f6cf350791434e640ac3519acc6c ("core:
remove duplicate code in automount_update_mount()").
This was not duplicate code. The expire_tokens need to be handled as well:
Send 0 == success for MOUNT_DEAD (umount successful), do nothing for
MOUNT_UNMOUNTING (not yet done) and an error for everything else.
Otherwise the automount logic will assume unmounting is not done and will
not send any new requests for mounting. As a result, the corresponding
mount unit is never mounted.
Without this, automounts with TimeoutIdleSec= are broken. Once the idle
timeout triggered a umount, any access to the corresponding filesystem
hangs forever.
Fixes #3332.
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This makes systemctl robust regarding journal truncation.
This is a follow-up for 2cf4172a71860c6e44
Fixes:
Core was generated by `./systemctl status systemd-journald'.
Program terminated with signal SIGBUS, Bus error.
PID 8569 - core
TID 8569:
#0 0x00007f246cc89ed6 __memcmp_sse4_1
#1 0x0000557ebbc6f42c journal_file_init_header
#2 0x0000557ebbc77262 journal_file_open
#3 0x0000557ebbc42999 file_type_wanted
#4 0x0000557ebbc42e08 add_any_file
#5 0x0000557ebbc43832 add_directory
#6 0x0000557ebbc4401c add_root_directory
#7 0x0000557ebbc442e9 add_root_directory
#8 0x0000557ebbc446fc add_search_paths
#9 0x0000557ebbbacb5e show_journal_by_unit
#10 0x0000557ebbb8376d print_status_info
#11 0x0000557ebbb86a0b show_one
#12 0x0000557ebbb87954 show
#13 0x0000557ebbc20b1f dispatch_verb
#14 0x0000557ebbb90615 systemctl_main
#15 0x0000557ebbb9159f main
#16 0x00007f246cb3e731 __libc_start_main
#17 0x0000557ebbb75ae9 _start
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Assorted stuff
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Obviously we've been using the wrong handler here. Fixes #3352.
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This covers the address/routers acquire dynamically.
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We generally only use "const" to constify the destination of pointers, but not
the pointers themselves, as they are copied anyway during C function
invocation. Hence, drop this usage of "const".
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Drop weird "const" usage, and use size_t for sizes.
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addresses/routes/fdb entries
We should put a limit on everything, hence also on these resources.
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New exec boolean MemoryDenyWriteExecute, when set, installs
a seccomp filter to reject mmap(2) with PAGE_WRITE|PAGE_EXEC
and mprotect(2) with PAGE_EXEC.
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networkd-dhcp6: DHCPv6 starting fixes
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