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feat(core): DHCP in the simulation core, as in Swift

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engine.ts ports Swift's "DHCP server and automatic client": an active
server listens on port 67 from the start and offers a static assignment
before its range, round from the address after the last one offered;
offers last 10 s, dynamic leases a day, and a server whose offer another
server beat blacklists that address for a while. A client starts as an
event: DISCOVER, OFFER, a check by ARP, DECLINE, REQUEST, ACK or NAK,
2.5 s per wait, and after ten failures its old address back. The snapshot
carries the DHCP settings of clients and servers.

Four scenarios match the Swift engine. One Swift error is named in the
oracle test: a client run directly is advanced a second time, to FINISH,
by the server's answer within its own DISCOVER, and the outer run then
writes back its stale copy of the status (Swift's value types); the
address and every trace agree, only the reported status is wrong in
Swift. Swift's three DHCP engine tests are ported, with tests for
stopping and the message format. 15 mutation probes, 14 caught; the other
concerns the home router, which runs only once NAT is ported.

Two departures from Java remain, to be fixed next: from the event queue
the client's ARP check does not wait, so an address conflict is never
found, and each answer that wakes the client makes it send its state's
message again (a second DISCOVER and REQUEST, the second answered with
NAK). Java waits a round trip and sends once per attempt.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
julian.kiedaisch
2026-09-30 10:17:36 +00:00
co-authored by Claude Opus 5.5
parent 12849b1535
commit 396dbacfc5
26 changed files with 43646 additions and 23 deletions
Download Patch File Download Diff File Expand all files Collapse all files
packages/core/test/scenarios/dhcp-conflict.scenario.json
+116
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@@ -0,0 +1,116 @@
{
"seed": 43,
"nodes": [
{
"id": "00000000-0000-0000-0000-000000000101",
"kind": "pc",
"ports": [
{
"id": "00000000-0000-0000-0000-000000000111",
"label": "eth0"
}
]
},
{
"id": "00000000-0000-0000-0000-000000000102",
"kind": "pc",
"ports": [
{
"id": "00000000-0000-0000-0000-000000000112",
"label": "eth0"
}
]
},
{
"id": "00000000-0000-0000-0000-000000000103",
"kind": "pc",
"ports": [
{
"id": "00000000-0000-0000-0000-000000000113",
"label": "eth0"
}
]
},
{
"id": "00000000-0000-0000-0000-000000000104",
"kind": "networkSwitch",
"ports": [
{
"id": "00000000-0000-0000-0000-000000000121",
"label": "sw1"
},
{
"id": "00000000-0000-0000-0000-000000000122",
"label": "sw2"
},
{
"id": "00000000-0000-0000-0000-000000000123",
"label": "sw3"
},
{
"id": "00000000-0000-0000-0000-000000000124",
"label": "sw4"
}
]
}
],
"links": [
{
"id": "00000000-0000-0000-0000-00000000F001",
"sourceNode": "00000000-0000-0000-0000-000000000101",
"sourcePort": "00000000-0000-0000-0000-000000000111",
"targetNode": "00000000-0000-0000-0000-000000000104",
"targetPort": "00000000-0000-0000-0000-000000000121"
},
{
"id": "00000000-0000-0000-0000-00000000F002",
"sourceNode": "00000000-0000-0000-0000-000000000102",
"sourcePort": "00000000-0000-0000-0000-000000000112",
"targetNode": "00000000-0000-0000-0000-000000000104",
"targetPort": "00000000-0000-0000-0000-000000000122"
},
{
"id": "00000000-0000-0000-0000-00000000F003",
"sourceNode": "00000000-0000-0000-0000-000000000103",
"sourcePort": "00000000-0000-0000-0000-000000000113",
"targetNode": "00000000-0000-0000-0000-000000000104",
"targetPort": "00000000-0000-0000-0000-000000000123"
}
],
"devices": {
"00000000-0000-0000-0000-000000000101": {
"ip": "192.168.0.10",
"mask": "255.255.255.0"
},
"00000000-0000-0000-0000-000000000102": {
"ip": "169.254.1.2",
"mask": "255.255.0.0"
},
"00000000-0000-0000-0000-000000000103": {
"ip": "192.168.0.100",
"mask": "255.255.255.0"
}
},
"switches": {
"00000000-0000-0000-0000-000000000104": {
"ssid": "lab",
"retention": 5000
}
},
"steps": [
{
"op": "advance",
"to": 60000
}
],
"dhcpServers": {
"00000000-0000-0000-0000-000000000101": {
"active": true,
"lower": "192.168.0.100",
"upper": "192.168.0.100"
}
},
"dhcpClients": [
"00000000-0000-0000-0000-000000000102"
]
}
packages/core/test/scenarios/dhcp-conflict.swift.json
+4184
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packages/core/test/scenarios/dhcp-lan.scenario.json
+144
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@@ -0,0 +1,144 @@
{
"seed": 41,
"nodes": [
{
"id": "00000000-0000-0000-0000-000000000101",
"kind": "pc",
"ports": [
{
"id": "00000000-0000-0000-0000-000000000111",
"label": "eth0"
}
]
},
{
"id": "00000000-0000-0000-0000-000000000102",
"kind": "pc",
"ports": [
{
"id": "00000000-0000-0000-0000-000000000112",
"label": "eth0"
}
]
},
{
"id": "00000000-0000-0000-0000-000000000103",
"kind": "pc",
"ports": [
{
"id": "00000000-0000-0000-0000-000000000113",
"label": "eth0"
}
]
},
{
"id": "00000000-0000-0000-0000-000000000104",
"kind": "networkSwitch",
"ports": [
{
"id": "00000000-0000-0000-0000-000000000121",
"label": "sw1"
},
{
"id": "00000000-0000-0000-0000-000000000122",
"label": "sw2"
},
{
"id": "00000000-0000-0000-0000-000000000123",
"label": "sw3"
},
{
"id": "00000000-0000-0000-0000-000000000124",
"label": "sw4"
}
]
}
],
"links": [
{
"id": "00000000-0000-0000-0000-00000000F001",
"sourceNode": "00000000-0000-0000-0000-000000000101",
"sourcePort": "00000000-0000-0000-0000-000000000111",
"targetNode": "00000000-0000-0000-0000-000000000104",
"targetPort": "00000000-0000-0000-0000-000000000121"
},
{
"id": "00000000-0000-0000-0000-00000000F002",
"sourceNode": "00000000-0000-0000-0000-000000000102",
"sourcePort": "00000000-0000-0000-0000-000000000112",
"targetNode": "00000000-0000-0000-0000-000000000104",
"targetPort": "00000000-0000-0000-0000-000000000122"
},
{
"id": "00000000-0000-0000-0000-00000000F003",
"sourceNode": "00000000-0000-0000-0000-000000000103",
"sourcePort": "00000000-0000-0000-0000-000000000113",
"targetNode": "00000000-0000-0000-0000-000000000104",
"targetPort": "00000000-0000-0000-0000-000000000123"
}
],
"devices": {
"00000000-0000-0000-0000-000000000101": {
"ip": "192.168.0.10",
"mask": "255.255.255.0"
},
"00000000-0000-0000-0000-000000000102": {
"ip": "169.254.1.2",
"mask": "255.255.0.0"
},
"00000000-0000-0000-0000-000000000103": {
"ip": "169.254.1.3",
"mask": "255.255.0.0"
}
},
"switches": {
"00000000-0000-0000-0000-000000000104": {
"ssid": "lab",
"retention": 5000
}
},
"steps": [
{
"op": "advance",
"to": 20000
},
{
"op": "runDhcp",
"node": "00000000-0000-0000-0000-000000000102"
},
{
"op": "ping",
"from": "00000000-0000-0000-0000-000000000102",
"target": "192.168.0.10",
"identifier": 1,
"sequence": 1
},
{
"op": "ping",
"from": "00000000-0000-0000-0000-000000000101",
"target": "192.168.0.150",
"identifier": 2,
"sequence": 1
}
],
"dhcpServers": {
"00000000-0000-0000-0000-000000000101": {
"active": true,
"lower": "192.168.0.100",
"upper": "192.168.0.102",
"gateway": "192.168.0.1",
"dns": "192.168.0.53",
"own": true,
"staticAssignments": [
[
"02:00:00:00:01:13",
"192.168.0.150"
]
]
}
},
"dhcpClients": [
"00000000-0000-0000-0000-000000000102",
"00000000-0000-0000-0000-000000000103"
]
}
packages/core/test/scenarios/dhcp-lan.swift.json
+23927
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packages/core/test/scenarios/dhcp-no-server.scenario.json
+121
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@@ -0,0 +1,121 @@
{
"seed": 44,
"nodes": [
{
"id": "00000000-0000-0000-0000-000000000101",
"kind": "pc",
"ports": [
{
"id": "00000000-0000-0000-0000-000000000111",
"label": "eth0"
}
]
},
{
"id": "00000000-0000-0000-0000-000000000102",
"kind": "pc",
"ports": [
{
"id": "00000000-0000-0000-0000-000000000112",
"label": "eth0"
}
]
},
{
"id": "00000000-0000-0000-0000-000000000103",
"kind": "pc",
"ports": [
{
"id": "00000000-0000-0000-0000-000000000113",
"label": "eth0"
}
]
},
{
"id": "00000000-0000-0000-0000-000000000104",
"kind": "networkSwitch",
"ports": [
{
"id": "00000000-0000-0000-0000-000000000121",
"label": "sw1"
},
{
"id": "00000000-0000-0000-0000-000000000122",
"label": "sw2"
},
{
"id": "00000000-0000-0000-0000-000000000123",
"label": "sw3"
},
{
"id": "00000000-0000-0000-0000-000000000124",
"label": "sw4"
}
]
}
],
"links": [
{
"id": "00000000-0000-0000-0000-00000000F001",
"sourceNode": "00000000-0000-0000-0000-000000000101",
"sourcePort": "00000000-0000-0000-0000-000000000111",
"targetNode": "00000000-0000-0000-0000-000000000104",
"targetPort": "00000000-0000-0000-0000-000000000121"
},
{
"id": "00000000-0000-0000-0000-00000000F002",
"sourceNode": "00000000-0000-0000-0000-000000000102",
"sourcePort": "00000000-0000-0000-0000-000000000112",
"targetNode": "00000000-0000-0000-0000-000000000104",
"targetPort": "00000000-0000-0000-0000-000000000122"
},
{
"id": "00000000-0000-0000-0000-00000000F003",
"sourceNode": "00000000-0000-0000-0000-000000000103",
"sourcePort": "00000000-0000-0000-0000-000000000113",
"targetNode": "00000000-0000-0000-0000-000000000104",
"targetPort": "00000000-0000-0000-0000-000000000123"
}
],
"devices": {
"00000000-0000-0000-0000-000000000101": {
"ip": "192.168.0.10",
"mask": "255.255.255.0"
},
"00000000-0000-0000-0000-000000000102": {
"ip": "169.254.1.2",
"mask": "255.255.0.0"
},
"00000000-0000-0000-0000-000000000103": {
"ip": "192.168.0.30",
"mask": "255.255.255.0"
}
},
"switches": {
"00000000-0000-0000-0000-000000000104": {
"ssid": "lab",
"retention": 5000
}
},
"steps": [
{
"op": "advance",
"to": 10000
},
{
"op": "runDhcp",
"node": "00000000-0000-0000-0000-000000000102"
},
{
"op": "advance",
"to": 60000
},
{
"op": "runDhcp",
"node": "00000000-0000-0000-0000-000000000101"
}
],
"dhcpClients": [
"00000000-0000-0000-0000-000000000102"
]
}
packages/core/test/scenarios/dhcp-no-server.swift.json
+5411
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packages/core/test/scenarios/dhcp-two-servers.scenario.json
+125
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@@ -0,0 +1,125 @@
{
"seed": 42,
"nodes": [
{
"id": "00000000-0000-0000-0000-000000000101",
"kind": "pc",
"ports": [
{
"id": "00000000-0000-0000-0000-000000000111",
"label": "eth0"
}
]
},
{
"id": "00000000-0000-0000-0000-000000000102",
"kind": "pc",
"ports": [
{
"id": "00000000-0000-0000-0000-000000000112",
"label": "eth0"
}
]
},
{
"id": "00000000-0000-0000-0000-000000000103",
"kind": "pc",
"ports": [
{
"id": "00000000-0000-0000-0000-000000000113",
"label": "eth0"
}
]
},
{
"id": "00000000-0000-0000-0000-000000000104",
"kind": "networkSwitch",
"ports": [
{
"id": "00000000-0000-0000-0000-000000000121",
"label": "sw1"
},
{
"id": "00000000-0000-0000-0000-000000000122",
"label": "sw2"
},
{
"id": "00000000-0000-0000-0000-000000000123",
"label": "sw3"
},
{
"id": "00000000-0000-0000-0000-000000000124",
"label": "sw4"
}
]
}
],
"links": [
{
"id": "00000000-0000-0000-0000-00000000F001",
"sourceNode": "00000000-0000-0000-0000-000000000101",
"sourcePort": "00000000-0000-0000-0000-000000000111",
"targetNode": "00000000-0000-0000-0000-000000000104",
"targetPort": "00000000-0000-0000-0000-000000000121"
},
{
"id": "00000000-0000-0000-0000-00000000F002",
"sourceNode": "00000000-0000-0000-0000-000000000102",
"sourcePort": "00000000-0000-0000-0000-000000000112",
"targetNode": "00000000-0000-0000-0000-000000000104",
"targetPort": "00000000-0000-0000-0000-000000000122"
},
{
"id": "00000000-0000-0000-0000-00000000F003",
"sourceNode": "00000000-0000-0000-0000-000000000103",
"sourcePort": "00000000-0000-0000-0000-000000000113",
"targetNode": "00000000-0000-0000-0000-000000000104",
"targetPort": "00000000-0000-0000-0000-000000000123"
}
],
"devices": {
"00000000-0000-0000-0000-000000000101": {
"ip": "192.168.0.10",
"mask": "255.255.255.0",
"gateway": "192.168.0.254"
},
"00000000-0000-0000-0000-000000000102": {
"ip": "169.254.1.2",
"mask": "255.255.0.0"
},
"00000000-0000-0000-0000-000000000103": {
"ip": "192.168.0.30",
"mask": "255.255.255.0"
}
},
"switches": {
"00000000-0000-0000-0000-000000000104": {
"ssid": "lab",
"retention": 5000
}
},
"steps": [
{
"op": "advance",
"to": 20000
}
],
"dhcpServers": {
"00000000-0000-0000-0000-000000000101": {
"active": true,
"lower": "192.168.0.100",
"upper": "192.168.0.110"
},
"00000000-0000-0000-0000-000000000103": {
"active": true,
"lower": "192.168.0.200",
"upper": "192.168.0.210",
"own": true,
"gateway": "192.168.0.1",
"dns": "8.8.8.8"
}
},
"dhcpClients": [
"00000000-0000-0000-0000-000000000102"
]
}
packages/core/test/scenarios/dhcp-two-servers.swift.json
+8227
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packages/core/test/scenarios/firewall-and-loss.swift.json
+43
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@@ -13,6 +13,49 @@
"10.1.0.2" : "02:00:00:00:04:11"
}
},
"devices" : {
"00000000-0000-0000-0000-000000000401" : [
"10.1.0.2",
"255.255.255.0",
"10.1.0.1",
""
],
"00000000-0000-0000-0000-000000000402" : [
"10.1.0.1",
"255.255.255.0",
"",
""
],
"00000000-0000-0000-0000-000000000403" : [
"10.2.0.2",
"255.255.255.0",
"10.2.0.1",
""
],
"00000000-0000-0000-0000-000000000404" : [
"10.1.0.3",
"255.255.255.0",
"10.1.0.1",
""
]
},
"dhcp" : {
"blacklist" : {
},
"clients" : {
},
"leases" : [
],
"offers" : [
],
"servers" : {
}
},
"firewallDecisions" : [
{
"accepted" : false,
packages/core/test/scenarios/routed-two-networks.swift.json
+37
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@@ -11,6 +11,43 @@
"20.0.0.1" : "02:00:00:00:02:22"
}
},
"devices" : {
"00000000-0000-0000-0000-000000000201" : [
"10.0.0.2",
"255.255.255.0",
"10.0.0.1",
""
],
"00000000-0000-0000-0000-000000000202" : [
"10.0.0.1",
"255.255.255.0",
"",
""
],
"00000000-0000-0000-0000-000000000203" : [
"20.0.0.2",
"255.255.255.0",
"20.0.0.1",
""
]
},
"dhcp" : {
"blacklist" : {
},
"clients" : {
},
"leases" : [
],
"offers" : [
],
"servers" : {
}
},
"firewallDecisions" : [
{
"accepted" : true,
packages/core/test/scenarios/router-chain-manual-routes.swift.json
+49
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@@ -15,6 +15,55 @@
"172.16.0.1" : "02:00:00:00:03:32"
}
},
"devices" : {
"00000000-0000-0000-0000-000000000301" : [
"192.168.1.10",
"255.255.255.0",
"192.168.1.1",
""
],
"00000000-0000-0000-0000-000000000302" : [
"192.168.1.1",
"255.255.255.0",
"",
""
],
"00000000-0000-0000-0000-000000000303" : [
"10.10.10.2",
"255.255.255.0",
"10.10.10.1",
""
],
"00000000-0000-0000-0000-000000000304" : [
"172.16.0.10",
"255.255.0.0",
"172.16.0.1",
""
],
"00000000-0000-0000-0000-000000000305" : [
"172.16.0.20",
"255.255.0.0",
"",
""
]
},
"dhcp" : {
"blacklist" : {
},
"clients" : {
},
"leases" : [
],
"offers" : [
],
"servers" : {
}
},
"firewallDecisions" : [
{
"accepted" : true,
packages/core/test/scenarios/switch-ageing-boundary.swift.json
+31
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@@ -7,6 +7,37 @@
"10.5.0.1" : "02:00:00:00:05:11"
}
},
"devices" : {
"00000000-0000-0000-0000-000000000501" : [
"10.5.0.1",
"255.255.255.0",
"",
""
],
"00000000-0000-0000-0000-000000000502" : [
"10.5.0.2",
"255.255.255.0",
"",
""
]
},
"dhcp" : {
"blacklist" : {
},
"clients" : {
},
"leases" : [
],
"offers" : [
],
"servers" : {
}
},
"firewallDecisions" : [
],
packages/core/test/scenarios/switch-lan.swift.json
+37
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@@ -13,6 +13,43 @@
"192.168.0.20" : "02:00:00:00:01:12"
}
},
"devices" : {
"00000000-0000-0000-0000-000000000101" : [
"192.168.0.10",
"255.255.255.0",
"",
""
],
"00000000-0000-0000-0000-000000000102" : [
"192.168.0.20",
"255.255.255.0",
"",
""
],
"00000000-0000-0000-0000-000000000103" : [
"192.168.0.30",
"255.255.255.0",
"",
""
]
},
"dhcp" : {
"blacklist" : {
},
"clients" : {
},
"leases" : [
],
"offers" : [
],
"servers" : {
}
},
"firewallDecisions" : [
],
packages/core/test/scenarios/tcp-closing.swift.json
+37
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@@ -10,6 +10,43 @@
"192.168.0.20" : "02:00:00:00:01:12"
}
},
"devices" : {
"00000000-0000-0000-0000-000000000101" : [
"192.168.0.10",
"255.255.255.0",
"",
""
],
"00000000-0000-0000-0000-000000000102" : [
"192.168.0.20",
"255.255.255.0",
"",
""
],
"00000000-0000-0000-0000-000000000103" : [
"192.168.0.30",
"255.255.255.0",
"",
""
]
},
"dhcp" : {
"blacklist" : {
},
"clients" : {
},
"leases" : [
],
"offers" : [
],
"servers" : {
}
},
"firewallDecisions" : [
],
packages/core/test/scenarios/tcp-lan.swift.json
+37
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@@ -13,6 +13,43 @@
"192.168.0.20" : "02:00:00:00:01:12"
}
},
"devices" : {
"00000000-0000-0000-0000-000000000101" : [
"192.168.0.10",
"255.255.255.0",
"",
""
],
"00000000-0000-0000-0000-000000000102" : [
"192.168.0.20",
"255.255.255.0",
"",
""
],
"00000000-0000-0000-0000-000000000103" : [
"192.168.0.30",
"255.255.255.0",
"",
""
]
},
"dhcp" : {
"blacklist" : {
},
"clients" : {
},
"leases" : [
],
"offers" : [
],
"servers" : {
}
},
"firewallDecisions" : [
],
packages/core/test/scenarios/tcp-routed-loss.swift.json
+37
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@@ -11,6 +11,43 @@
"20.0.0.1" : "02:00:00:00:02:22"
}
},
"devices" : {
"00000000-0000-0000-0000-000000000201" : [
"10.0.0.2",
"255.255.255.0",
"10.0.0.1",
""
],
"00000000-0000-0000-0000-000000000202" : [
"10.0.0.1",
"255.255.255.0",
"",
""
],
"00000000-0000-0000-0000-000000000203" : [
"20.0.0.2",
"255.255.255.0",
"20.0.0.1",
""
]
},
"dhcp" : {
"blacklist" : {
},
"clients" : {
},
"leases" : [
],
"offers" : [
],
"servers" : {
}
},
"firewallDecisions" : [
{
"accepted" : true,
packages/core/test/scenarios/udp-lan.swift.json
+37
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@@ -11,6 +11,43 @@
"192.168.0.20" : "02:00:00:00:01:12"
}
},
"devices" : {
"00000000-0000-0000-0000-000000000101" : [
"192.168.0.10",
"255.255.255.0",
"",
""
],
"00000000-0000-0000-0000-000000000102" : [
"192.168.0.20",
"255.255.255.0",
"",
""
],
"00000000-0000-0000-0000-000000000103" : [
"192.168.0.30",
"255.255.255.0",
"",
""
]
},
"dhcp" : {
"blacklist" : {
},
"clients" : {
},
"leases" : [
],
"offers" : [
],
"servers" : {
}
},
"firewallDecisions" : [
],
packages/core/test/scenarios/udp-routed.swift.json
+37
View File
@@ -11,6 +11,43 @@
"20.0.0.1" : "02:00:00:00:02:22"
}
},
"devices" : {
"00000000-0000-0000-0000-000000000201" : [
"10.0.0.2",
"255.255.255.0",
"10.0.0.1",
""
],
"00000000-0000-0000-0000-000000000202" : [
"10.0.0.1",
"255.255.255.0",
"",
""
],
"00000000-0000-0000-0000-000000000203" : [
"20.0.0.2",
"255.255.255.0",
"20.0.0.1",
""
]
},
"dhcp" : {
"blacklist" : {
},
"clients" : {
},
"leases" : [
],
"offers" : [
],
"servers" : {
}
},
"firewallDecisions" : [
{
"accepted" : true,