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author | Thomas Haller <thaller@redhat.com> | 2019-09-23 16:41:12 +0200 |
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committer | Thomas Haller <thaller@redhat.com> | 2019-11-20 10:58:51 +0100 |
commit | d29c8b615a69438f01e58c329b8e34747e008685 (patch) | |
tree | 687d3ccb2f80285f87c44cd2e6938c245cd6d570 /shared/n-dhcp4 | |
parent | ce5c8db1753357a0b853357ee1e4cd74ba5ad50d (diff) | |
download | NetworkManager-d29c8b615a69438f01e58c329b8e34747e008685.tar.gz |
incoming: don't handle 0xFFFFFFFF timestamps special in n_dhcp4_incoming_query_u32()
First of all, from the naming of n_dhcp4_incoming_query_u32() it is
confusing to coerce 0xFFFFFFFF to zero. It should just return the
plain value.
Also note that n_dhcp4_incoming_query_u32() only has three callers:
n_dhcp4_incoming_query_lifetime(), n_dhcp4_incoming_query_t1() and
n_dhcp4_incoming_query_t2().
Looking further, those three functions only have one caller:
n_dhcp4_incoming_get_timeouts(). Note how the code there already tries
to handle UINT32_MAX and interprets it as infinity (UINT64_MAX).
But as it was, UINT32_MAX never actually was returned.
It seems that RFC [1] does not specially define the meanings of
0xFFFFFFFF and 0. It sounds reasonable to assume that 0 just means
0 lifetime, and 0xFFFFFFFF means infinity. On the other hand, compare
this to systemd's code [2], which coerces 0 to 1. This does not seem
right to me though. Note how systemd returns 0xFFFFFFFF as-is.
Drop the special handling of 0xFFFFFFFF from n_dhcp4_incoming_query_u32().
It now just returns the plain value and it's up to n_dhcp4_incoming_get_timeouts()
to make sense of that. This will fix behavior, so that 0xFFFFFFFF will be
reported as infinity, and not as zero.
[1] https://tools.ietf.org/html/rfc2132#section-9.2
[2] https://github.com/systemd/systemd/blob/68c2b5ddb1881c40201c1d86a7852dd5c5c06a76/src/libsystemd-network/sd-dhcp-lease.c#L553
Diffstat (limited to 'shared/n-dhcp4')
-rw-r--r-- | shared/n-dhcp4/src/n-dhcp4-incoming.c | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/shared/n-dhcp4/src/n-dhcp4-incoming.c b/shared/n-dhcp4/src/n-dhcp4-incoming.c index 255da45845..e7234c0a52 100644 --- a/shared/n-dhcp4/src/n-dhcp4-incoming.c +++ b/shared/n-dhcp4/src/n-dhcp4-incoming.c @@ -365,10 +365,7 @@ static int n_dhcp4_incoming_query_u32(NDhcp4Incoming *message, uint8_t option, u memcpy(&be32, data, sizeof(be32)); - if (be32 == (uint32_t)-1) - *u32p = 0; - else - *u32p = ntohl(be32); + *u32p = ntohl(be32); return 0; } |