## HTTP API

Olm can be controlled with an embedded HTTP server when using `--enable-http`. This allows you to start it as a daemon and trigger it with the following endpoints. The API can listen on either a TCP address or a Unix socket/Windows named pipe.

### Socket vs TCP

By default, when `--enable-http` is used, Olm listens on a TCP address (configured via `--http-addr`, default `:9452`). Alternatively, Olm can listen on a Unix socket (Linux/macOS) or Windows named pipe for local-only communication with better security.

**Unix Socket (Linux/macOS):**
- Socket path example: `/var/run/olm/olm.sock`
- The directory is created automatically if it doesn't exist
- Socket permissions are set to `0666` to allow access
- Existing socket files are automatically removed on startup
- Socket file is cleaned up when Olm stops

**Windows Named Pipe:**
- Pipe path example: `\\.\pipe\olm`
- If the path doesn't start with `\`, it's automatically prefixed with `\\.\pipe\`
- Security descriptor grants full access to Everyone and the current owner
- Named pipes are automatically cleaned up by Windows

**Connecting to the Socket:**

```bash
# Linux/macOS - using curl with Unix socket
curl --unix-socket /var/run/olm/olm.sock http://localhost/status

---

### POST /connect
Initiates a new connection request to a Pangolin server.

**Request Body:**
```json
{
  "id": "string",
  "secret": "string",
  "endpoint": "string",
  "userToken": "string",
  "mtu": 1280,
  "dns": "8.8.8.8",
  "dnsProxyIP": "string",
  "upstreamDNS": ["8.8.8.8:53", "1.1.1.1:53"],
  "interfaceName": "olm",
  "holepunch": false,
  "tlsClientCert": "string",
  "pingInterval": "3s",
  "pingTimeout": "5s",
  "orgId": "string",
  "fingerprint": {
    "username": "string",
    "hostname": "string",
    "platform": "string",
    "osVersion": "string",
    "kernelVersion": "string",
    "arch": "string",
    "deviceModel": "string",
    "serialNumber": "string"
  },
  "postures": {}
}
```

**Required Fields:**
- `id`: Olm ID generated by Pangolin
- `secret`: Authentication secret for the Olm ID
- `endpoint`: Target Pangolin endpoint URL

**Optional Fields:**
- `userToken`: User authentication token
- `mtu`: MTU for the internal WireGuard interface (default: 1280)
- `dns`: DNS server to use for resolving the endpoint
- `dnsProxyIP`: DNS proxy IP address
- `upstreamDNS`: Array of upstream DNS servers
- `interfaceName`: Name of the WireGuard interface (default: olm)
- `holepunch`: Enable NAT hole punching (default: false)
- `tlsClientCert`: TLS client certificate
- `pingInterval`: Interval for pinging the server (default: 3s)
- `pingTimeout`: Timeout for each ping (default: 5s)
- `orgId`: Organization ID to connect to
- `fingerprint`: Device fingerprinting information (should be set before connecting)
  - `username`: Current username on the device
  - `hostname`: Device hostname
  - `platform`: Operating system platform (macos, windows, linux, ios, android, unknown)
  - `osVersion`: Operating system version
  - `kernelVersion`: Kernel version
  - `arch`: System architecture (e.g., amd64, arm64)
  - `deviceModel`: Device model identifier
  - `serialNumber`: Device serial number
- `postures`: Device posture/security information

**Response:**
- **Status Code:** `202 Accepted`
- **Content-Type:** `application/json`

```json
{
  "status": "connection request accepted"
}
```

**Error Responses:**
- `405 Method Not Allowed` - Non-POST requests
- `400 Bad Request` - Invalid JSON or missing required fields
- `409 Conflict` - Already connected to a server (disconnect first)

---

### GET /status
Returns the current connection status, registration state, and peer information.

**Response:**
- **Status Code:** `200 OK`
- **Content-Type:** `application/json`

```json
{
  "connected": true,
  "registered": true,
  "terminated": false,
  "version": "1.0.0",
  "agent": "olm",
  "orgId": "org_123",
  "peers": {
    "10": {
      "siteId": 10,
      "name": "Site A",
      "connected": true,
      "rtt": 145338339,
      "lastSeen": "2025-08-13T14:39:17.208334428-07:00",
      "endpoint": "p.fosrl.io:21820",
      "isRelay": true,
      "peerAddress": "100.89.128.5",
      "holepunchConnected": false
    },
    "8": {
      "siteId": 8,
      "name": "Site B",
      "connected": false,
      "rtt": 0,
      "lastSeen": "2025-08-13T14:39:19.663823645-07:00",
      "endpoint": "p.fosrl.io:21820",
      "isRelay": true,
      "peerAddress": "100.89.128.10",
      "holepunchConnected": false
    }
  },
  "networkSettings": {
    "tunnelIP": "100.89.128.3/20"
  }
}
```

**Fields:**
- `connected`: Boolean indicating if connected to Pangolin
- `registered`: Boolean indicating if registered with the server
- `terminated`: Boolean indicating if the connection was terminated
- `version`: Olm version string
- `agent`: Agent identifier
- `orgId`: Current organization ID
- `peers`: Map of peer statuses by site ID
  - `siteId`: Peer site identifier
  - `name`: Site name
  - `connected`: Boolean peer connection state
  - `rtt`: Peer round-trip time (integer, nanoseconds)
  - `lastSeen`: Last time peer was seen (RFC3339 timestamp)
  - `endpoint`: Peer endpoint address
  - `isRelay`: Whether the peer is relayed (true) or direct (false)
  - `peerAddress`: Peer's IP address in the tunnel
  - `holepunchConnected`: Whether holepunch connection is established
- `networkSettings`: Current network configuration including tunnel IP

**Error Responses:**
- `405 Method Not Allowed` - Non-GET requests

---

### POST /disconnect
Disconnects from the current Pangolin server and tears down the WireGuard tunnel.

**Request Body:** None required

**Response:**
- **Status Code:** `200 OK`
- **Content-Type:** `application/json`

```json
{
  "status": "disconnect initiated"
}
```

**Error Responses:**
- `405 Method Not Allowed` - Non-POST requests
- `409 Conflict` - Not currently connected to a server

---

### POST /switch-org
Switches to a different organization while maintaining the connection.

**Request Body:**
```json
{
  "orgId": "string"
}
```

**Required Fields:**
- `orgId`: The organization ID to switch to

**Response:**
- **Status Code:** `200 OK`
- **Content-Type:** `application/json`

```json
{
  "status": "org switch request accepted"
}
```

**Error Responses:**
- `405 Method Not Allowed` - Non-POST requests
- `400 Bad Request` - Invalid JSON or missing orgId field
- `500 Internal Server Error` - Org switch failed

---

### PUT /metadata
Updates device fingerprinting and posture information. This endpoint can be called at any time to update metadata, but it's recommended to provide this information in the initial `/connect` request or immediately before connecting.

**Request Body:**
```json
{
  "fingerprint": {
    "username": "string",
    "hostname": "string",
    "platform": "string",
    "osVersion": "string",
    "kernelVersion": "string",
    "arch": "string",
    "deviceModel": "string",
    "serialNumber": "string"
  },
  "postures": {}
}
```

**Optional Fields:**
- `fingerprint`: Device fingerprinting information
  - `username`: Current username on the device
  - `hostname`: Device hostname
  - `platform`: Operating system platform (macos, windows, linux, ios, android, unknown)
  - `osVersion`: Operating system version
  - `kernelVersion`: Kernel version
  - `arch`: System architecture (e.g., amd64, arm64)
  - `deviceModel`: Device model identifier
  - `serialNumber`: Device serial number
- `postures`: Device posture/security information (object with arbitrary key-value pairs)

**Response:**
- **Status Code:** `200 OK`
- **Content-Type:** `application/json`

```json
{
  "status": "metadata updated"
}
```

**Error Responses:**
- `405 Method Not Allowed` - Non-PUT requests
- `400 Bad Request` - Invalid JSON

**Note:** It's recommended to call this endpoint BEFORE `/connect` to ensure fingerprinting information is available during the initial connection handshake.

---

### POST /exit
Initiates a graceful shutdown of the Olm process.

**Request Body:** None required

**Response:**
- **Status Code:** `200 OK`
- **Content-Type:** `application/json`

```json
{
  "status": "shutdown initiated"
}
```

**Note:** The response is sent before shutdown begins. There is a 100ms delay before the actual shutdown to ensure the response is delivered.

**Error Responses:**
- `405 Method Not Allowed` - Non-POST requests

---

### GET /health
Simple health check endpoint to verify the API server is running.

**Response:**
- **Status Code:** `200 OK`
- **Content-Type:** `application/json`

```json
{
  "status": "ok"
}
```

**Error Responses:**
- `405 Method Not Allowed` - Non-GET requests

---

## Usage Examples

### Update metadata before connecting (recommended)
```bash
curl -X PUT http://localhost:9452/metadata \
  -H "Content-Type: application/json" \
  -d '{
    "fingerprint": {
      "username": "john",
      "hostname": "johns-laptop",
      "platform": "macos",
      "osVersion": "14.2.1",
      "arch": "arm64",
      "deviceModel": "MacBookPro18,3"
    }
  }'
```

### Connect to a peer
```bash
curl -X POST http://localhost:9452/connect \
  -H "Content-Type: application/json" \
  -d '{
    "id": "31frd0uzbjvp721",
    "secret": "h51mmlknrvrwv8s4r1i210azhumt6isgbpyavxodibx1k2d6",
    "endpoint": "https://example.com"
  }'
```

### Connect with additional options
```bash
curl -X POST http://localhost:9452/connect \
  -H "Content-Type: application/json" \
  -d '{
    "id": "31frd0uzbjvp721",
    "secret": "h51mmlknrvrwv8s4r1i210azhumt6isgbpyavxodibx1k2d6",
    "endpoint": "https://example.com",
    "mtu": 1400,
    "holepunch": true,
    "pingInterval": "5s"
  }'
```

### Check connection status
```bash
curl http://localhost:9452/status
```

### Switch organization
```bash
curl -X POST http://localhost:9452/switch-org \
  -H "Content-Type: application/json" \
  -d '{"orgId": "org_456"}'
```

### Disconnect from server
```bash
curl -X POST http://localhost:9452/disconnect
```

### Health check
```bash
curl http://localhost:9452/health
```

### Shutdown Olm
```bash
curl -X POST http://localhost:9452/exit
```

### Using Unix socket (Linux/macOS)
```bash
curl --unix-socket /var/run/olm/olm.sock http://localhost/status
curl --unix-socket /var/run/olm/olm.sock -X POST http://localhost/disconnect
```