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wgengine/netlog: include node OS in logged attributes (#17755)

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Include the node's OS with network flow log information.

Refactor the JSON-length computation to be a bit more precise.

Updates tailscale/corp#33352
Fixes tailscale/corp#34030

Signed-off-by: Joe Tsai <joetsai@digital-static.net>
This commit is contained in:
Joe Tsai
2025-11-04 12:36:04 -08:00
committed by GitHub
parent db7dcd516f
commit 77123a569b
7 changed files with 31 additions and 19 deletions
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2
cmd/k8s-operator/depaware.txt
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@@ -825,7 +825,7 @@ tailscale.com/cmd/k8s-operator dependencies: (generated by github.com/tailscale/
tailscale.com/tsweb from tailscale.com/util/eventbus
tailscale.com/tsweb/varz from tailscale.com/util/usermetric+
tailscale.com/types/appctype from tailscale.com/ipn/ipnlocal+
tailscale.com/types/bools from tailscale.com/tsnet
tailscale.com/types/bools from tailscale.com/tsnet+
tailscale.com/types/dnstype from tailscale.com/ipn/ipnlocal+
tailscale.com/types/empty from tailscale.com/ipn+
tailscale.com/types/ipproto from tailscale.com/net/flowtrack+

1
cmd/tailscaled/depaware.txt
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@@ -392,6 +392,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
tailscale.com/tsweb from tailscale.com/util/eventbus
tailscale.com/tsweb/varz from tailscale.com/cmd/tailscaled+
tailscale.com/types/appctype from tailscale.com/ipn/ipnlocal+
tailscale.com/types/bools from tailscale.com/wgengine/netlog
tailscale.com/types/dnstype from tailscale.com/ipn/ipnlocal+
tailscale.com/types/empty from tailscale.com/ipn+
tailscale.com/types/flagtype from tailscale.com/cmd/tailscaled

2
cmd/tsidp/depaware.txt
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@@ -230,7 +230,7 @@ tailscale.com/cmd/tsidp dependencies: (generated by github.com/tailscale/depawar
tailscale.com/tsweb from tailscale.com/util/eventbus
tailscale.com/tsweb/varz from tailscale.com/tsweb+
tailscale.com/types/appctype from tailscale.com/ipn/ipnlocal+
tailscale.com/types/bools from tailscale.com/tsnet
tailscale.com/types/bools from tailscale.com/tsnet+
tailscale.com/types/dnstype from tailscale.com/client/local+
tailscale.com/types/empty from tailscale.com/ipn+
tailscale.com/types/ipproto from tailscale.com/ipn+

2
tsnet/depaware.txt
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@@ -225,7 +225,7 @@ tailscale.com/tsnet dependencies: (generated by github.com/tailscale/depaware)
LDW tailscale.com/tsweb from tailscale.com/util/eventbus
tailscale.com/tsweb/varz from tailscale.com/tsweb+
tailscale.com/types/appctype from tailscale.com/ipn/ipnlocal+
tailscale.com/types/bools from tailscale.com/tsnet
tailscale.com/types/bools from tailscale.com/tsnet+
tailscale.com/types/dnstype from tailscale.com/client/local+
tailscale.com/types/empty from tailscale.com/ipn+
tailscale.com/types/ipproto from tailscale.com/ipn+

15
types/netlogtype/netlogtype.go
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@@ -44,18 +44,6 @@ const (
// Each [ConnectionCounts] occupies at most [MaxConnectionCountsJSONSize].
MinMessageJSONSize = len(messageJSON)
nodeJSON = `{"nodeId":` + maxJSONStableID + `,"name":"","addresses":` + maxJSONAddrs + `,"user":"","tags":[]}`
maxJSONAddrV4 = `"255.255.255.255"`
maxJSONAddrV6 = `"ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"`
maxJSONAddrs = `[` + maxJSONAddrV4 + `,` + maxJSONAddrV6 + `]`
// MinNodeJSONSize is the overhead size of Node when it is
// serialized as JSON assuming that each field is minimally populated.
// It does not account for bytes occupied by
// [Node.Name], [Node.User], or [Node.Tags]. The [Node.Addresses]
// is assumed to contain a pair of IPv4 and IPv6 address.
MinNodeJSONSize = len(nodeJSON)
maxJSONConnCounts = `{` + maxJSONConn + `,` + maxJSONCounts + `}`
maxJSONConn = `"proto":` + maxJSONProto + `,"src":` + maxJSONAddrPort + `,"dst":` + maxJSONAddrPort
maxJSONProto = `255`
@@ -82,6 +70,9 @@ type Node struct {
// Addresses are the Tailscale IP addresses of the node.
Addresses []netip.Addr `json:"addresses,omitempty"`
// OS is the operating system of the node.
OS string `json:"os,omitzero"` // e.g., "linux"
// User is the user that owns the node.
// It is not populated if the node is tagged.
User string `json:"user,omitzero"` // e.g., "johndoe@example.com"

26
wgengine/netlog/record.go
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@@ -13,6 +13,7 @@ import (
"unicode/utf8"
"tailscale.com/tailcfg"
"tailscale.com/types/bools"
"tailscale.com/types/netlogtype"
"tailscale.com/util/set"
)
@@ -134,17 +135,31 @@ func compareConnCnts(x, y netlogtype.ConnectionCounts) int {
}
// jsonLen computes an upper-bound on the size of the JSON representation.
func (nu nodeUser) jsonLen() int {
func (nu nodeUser) jsonLen() (n int) {
if !nu.Valid() {
return len(`{"nodeId":""}`)
}
n := netlogtype.MinNodeJSONSize + jsonQuotedLen(nu.Name())
n += len(`{}`)
n += len(`"nodeId":`) + jsonQuotedLen(string(nu.StableID())) + len(`,`)
if len(nu.Name()) > 0 {
n += len(`"name":`) + jsonQuotedLen(nu.Name()) + len(`,`)
}
if nu.Addresses().Len() > 0 {
n += len(`"addresses":[]`)
for _, addr := range nu.Addresses().All() {
n += bools.IfElse(addr.Addr().Is4(), len(`"255.255.255.255"`), len(`"ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"`)) + len(",")
}
}
if nu.Hostinfo().Valid() && len(nu.Hostinfo().OS()) > 0 {
n += len(`"os":`) + jsonQuotedLen(nu.Hostinfo().OS()) + len(`,`)
}
if nu.Tags().Len() > 0 {
n += len(`"tags":[]`)
for _, tag := range nu.Tags().All() {
n += jsonQuotedLen(tag) + len(",")
}
} else if nu.user.Valid() && nu.user.ID() == nu.User() {
n += jsonQuotedLen(nu.user.LoginName())
} else if nu.user.Valid() && nu.user.ID() == nu.User() && len(nu.user.LoginName()) > 0 {
n += len(`"user":`) + jsonQuotedLen(nu.user.LoginName()) + len(",")
}
return n
}
@@ -166,6 +181,9 @@ func (nu nodeUser) toNode() netlogtype.Node {
}
n.Addresses = []netip.Addr{ipv4, ipv6}
n.Addresses = slices.DeleteFunc(n.Addresses, func(a netip.Addr) bool { return !a.IsValid() })
if nu.Hostinfo().Valid() {
n.OS = nu.Hostinfo().OS()
}
if nu.Tags().Len() > 0 {
n.Tags = nu.Tags().AsSlice()
slices.Sort(n.Tags)

2
wgengine/netlog/record_test.go
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@@ -190,6 +190,7 @@ func TestToNode(t *testing.T) {
node: &tailcfg.Node{
StableID: "n123456CNTL",
Addresses: []netip.Prefix{prefix("100.1.2.3")},
Hostinfo: (&tailcfg.Hostinfo{OS: "linux"}).View(),
User: 12345,
},
user: &tailcfg.UserProfile{
@@ -199,6 +200,7 @@ func TestToNode(t *testing.T) {
want: netlogtype.Node{
NodeID: "n123456CNTL",
Addresses: []netip.Addr{addr("100.1.2.3")},
OS: "linux",
User: "user@domain",
},
},