README.md

# cellframe-node
Cellframe Node

[Cellframe Node usage Wiki](https://wiki.cellframe.net/index.php/Node_usage)


## Debian/Ubuntu

### Build from sources:

#### Prerequsites:

To successfully complete of the build, you must have following prerequisites preinstalled (packages are named as in Debian GNU/Linux 10 "buster", please found the corresponding packages for your distribution):

* libjson-c-dev
* libsqlite3-dev
* libmemcached-dev
* libev-dev
* libmagic-dev
* libcurl4-openssl-dev | libcurl4-nss-dev | libcurl4-gnutls-dev  ( depricated modules, soon will be removed)
* libldb-dev
* libtalloc-dev
* libtevent-dev
* libpython3-dev
* traceroute

#### Prepare system
Comamnd to install them all with build tools
```
sudo apt-get install build-essential cmake dpkg-dev libjson-c-dev libsqlite3-dev libmemcached-dev libev-dev libmagic-dev libcurl4-gnutls-dev libldb-dev libtalloc-dev libtevent-dev traceroute
```

#### Get all sources

This command fetch sources from gitlab and build them. 
  ```
  git clone https://gitlab.demlabs.net/cellframe/cellframe-node.git
  cd cellframe-node
  git submodule update --init
  cd cellframe-sdk
  git submodule update --init
  cd ../
  ```

#### Build sources
Get into directory with cellframe-node and do
  ```
  mkdir build
  cd build
  cmake ../
  make -j$(nproc)
  ```
*-j$(nproc)* is optional and specifies the number of threads will be used in building process.
Thats produce everything in build/ subdirectory.

### Install package

#### Prepare for installation
To prepare node for installation we need to produce pacakge. Or - do ```sudo make install``` from build directory, then get config template from ```dist/share/configs``` and produce proper one in ```/opt/celllframe-node/etc```
Anyway we suggest you to produce the package with command ```cpack``` from the build directory.

##### Install from local package
If you downloaded or build from sources a debian pacakge, like ```cellframe-node_2.11-4-buster_amd64.deb``` you need to install it with ```dpkg``` command. Example:
```
sudo dpkg -i ./cellframe-node_2.11-4-buster_amd64.deb
```
##### Install from DemLabs official public repository

* Create file /etc/apt/sources.list.d/demlabs.list with command ```sudo nano /etc/apt/sources.list.d/demlabs.list``` one line below for Debian 10:
  ```
  deb https://debian.pub.demlabs.net/ buster main
  ```
* For Ubuntu 18 (Bionic):
  ```
  deb https://debian.pub.demlabs.net/ bionic main universe
  ```
* Then download public signature and install it:
  ```
  wget https://debian.pub.demlabs.net/debian.pub.demlabs.net.gpg
  sudo apt-key add demlabskey.asc
  ```
* Then update your apt cache and install the package:
  ```
  sudo apt-get update
  sudo apt-get install cellframe-node
  ```

During installation it asks some questions

#### Debian package questions
All this could be changed after in configs


* Auto online
If true, the node goes online after he starts and then try to keep this state automatically 

* Debug mode
If true - produce more log output in files. Suggested to set ```true``` until the testing period 

* Debug stream headers
Dump stream headers in logs, set it ```true``` only if you want to get more debug information about stream packages passing through. Suggested ```false``` for almost everybody

* Accept connections
Enable/disable listening network address. Set ```false``` if you don't want to accept network connections to your node

* Server address
Network address used for listentning. Set ```0.0.0.0``` if you want to listen all network interfaces on your computer

* Server port (optional, usually don't ask)
Server port, 8079 by default but sometimes better to set it to ```80``` or ```443``` to masquarade service as web service. 

* Kelvin-testnet: Enable network
Set ```true``` if you want to connect your node with ```kelvin-testnet```

* Kelvin-testnet: Node type (role)
Select node type (or node role) from suggested list with short descriptions. By default suggested to select ```full```

### How to configure VPN service share

#### Node base configuration
Open ```/opt/cellframe-node/etc/cellframe-node.conf``` with command ```sudo nano /opt/cellframe-node/etc/cellframe-node.conf``` and find next section:

```
# VPN stream channel processing module
[srv_vpn]
#   Turn to true if you want to share VPN service from you node
enabled=false
#   List of loca security access groups. Built in: expats,admins,services,nobody,everybody
network_address=10.11.12.0
network_mask=255.255.255.0
#pricelist=[kelvin-testnet:0.00001:KELT:3600:SEC:mywallet0,kelvin-testnet:0.00001:cETH:3600:SEC:mywallet1,private:1:WOOD:10:SEC:mywallet0]
```

Turn ```enabled``` parameter to ```true``` thats enable VPN service on your node. Then, the next lines ```network_address``` and ```network_mask``` usually you don't need to touch. Default configuration reserves network addresses for 254 connections at one time, if you have more - change network mask to smth like ```255.255.0.0``` and network address to ```10.11.0.0``` thats gives you 4095 local addresses. 
Thats important - all the addresses are local and used only inside virtual private network (VPN). For this address and mask also should be configured OS - should be present DNS server, switched on IP4 forwarding and configured NAT. Example of such configurations are below:
Next line ```pricelist``` if commented out it shares service for free.

#### Pricelist config
Pricelist line has list of values, splitted with ```:``` symbol. What it means lets see in example ```kelvin-testnet:0.00001:KELT:3600:SEC:mywallet0```:

1. ```kelvin-testnet``` thats the chain network name where the price token issued
2. ```0.00001``` price per units. Important: not for one unit but for all the units, in our example - for 1 hour.
3. ```KELT``` token ticker thats will be used for payments
4. ```3600``` units number thats costs price `0.00001`
5. ```SEC``` unit type, could be ```SEC``` for seconds, ```DAY``` for days, ```MB``` for megabyte. IMPORTANT: if selected ```MB``` accounting would be not by time but by used traffic amount
6.```mywallet``` wallet name for payments accommodation, should be created before with ```cellframe-node-cli```. Used for signing conditioned transactions with receipts therefore they pass values to the selected wallet.

You could enter any number of such prices

#### DNS server install

Install DNS server, it could be any other than Bind9 but for example we will use exactly thats one

```sudo apt-get install bind9```

#### Switch on IPv4 forwarding 

Open ```/etc/sysctl.conf``` with command ```sudo nano /etc/sysctl.conf``` and find line 
```
# Uncomment the next line to enable packet forwarding for IPv4
#net.ipv4.ip_forward=1
```

I had it on 27-28 line in config. Uncomment ```net.ipv4.ip_forward=1``` as the comment above suggests. Then after you've changed them and saved changes, implement them with:
```
sudo sysctl -p
```
Then after reboot they will be implemented automatically


#### Configuring firewall with NAT

Easiest way is to install ```arno-iptables-firewall``` with the next command:
```
sudo apt-get install arno-iptables-firewall
```
It would ask next questions:

*  `External network interfaces` answer with you network interface thats used for internet access. Usually its `eth0` or `wifi0` but could be different, examine you network configuration first
*  `Do you want to manage the firewall setup with debconf` answer `Yes`
*  `External network interfaces` answer `tun0` if you haven't configured any other VPN servers. If they are - find what the tunnel number is biggest and list all of them here with your tunnel name (`tun<max number plus 1>` )
*  `Open external TCP-ports` answer `8079` or what the port do you configured for cellframe node when it was installed
*  `Open external UDP-ports:` answer same as in previous
*  `Internal network interfaces` answer `tun0` if you haven't configured any other VPN servers. If they are - find what the tunnel number is biggest and list all of them here with your tunnel name (`tun<max number plus 1>` )
*  `Internal subnets ` here should be network_adddres/network_mask from VPN service configuration, ```10.11.12.0/255.255.255.0``` in our example
*  `Should be restarted` answer `No` becase we need some more configs

Now lets increase config ask level and reconfigure the package with the next command:
```
sudo dpkg-reconfigure -plow arno-iptables-firewall
``` 

For answers where you'll see right answers just press enter to skip them. Then the next questions should appears:
* `Is DHCP used on external interfaces? ` usually answer `Yes`, answer `No` only if you have static network configuration for external connections
* `Should the machine be pingable from the outside world?` answer `Yes` because we use pings for network speed measurements
* `Do you want to enable NAT? ` answer `Yes`
* `Internal networks with access to external networks:` here you list internal networks again, ```10.11.12.0/255.255.255.0``` in our example
* `Should the firewall be (re)started now?` now answer `Yes` and have everything ready for routing


### How to run 

If the node is installed in your system you need only to check it if its runned on your system
```
  sudo service cellframe-node status
```
And if its not runned - start it. Start after reboot should be automaticaly executed.
```
  sudo service cellframe-node start
```

To stop it use the next command:
```
  sudo service cellframe-node stop
```

### How to publish service in network 


#### Obtain node address
First you need to publish you public IPv4 and/or IPv6 addresses (for current moment we support only IPv4)

```
sudo /opt/cellframe-node/bin/cellframe-node-cli net -net kelvin-testnet get status
```

It should print smth like this
```
Network "kelvin-testnet" has state NET_STATE_SYNC_CHAINS (target state NET_STATE_ONLINE), active links 3 from 4, cur node address 374C::CEB5::6740::D93B
```

#### Publish IP address in nodelist

Look at the end of address, thats you node address, ```374C::CEB5::6740::D93B``` use it to update information about your node, as in example below:
```
sudo /opt/cellframe-node/bin/cellframe-node-cli node add -net kelvin-testnet -addr 374C::CEB5::6740::D93B -cell 0x0000000000000001 -ipv4 5.89.17.176
```

Here is cell `0x0000000000000001` used by default until we haven't finished cell autoselection. Then ipv4 address is `5.89.17.176` replace it with your public IPv4 address. Same could be added ipv6 address with argument `-ipv6`


#### Create order for VPN service 

To say world that you have VPN service you need to place order. First lets see the market, what orders are already present:
```
sudo /opt/cellframe-node/bin/cellframe-node-cli net_srv -net kelvin-testnet order find -srv_uid 0x0000000000000001 -direction sell
```

It should print list if you've syncronized well before (should happens automatically by default)
Anyway, lets create our order, changing price in it and in ```cellframe-node.cfg``` if you see in list thats market changed and you need to change prices as well.
Here is exmaple based on our pricelist in previous examples:
```sudo /opt/cellframe-node/bin/cellframe-node-cli net_srv -net kelvin-testnet order create -direction sell -srv_uid 1 -srv_class PERM -price_unit 2 -price_token KELT -price 100```

And then you just wait some for network synchronisation and your order will see everybody.

Description of arguments
* ```-direction``` buy or sell, for VPN service publishing it must be ```sell```
* ```-srv_uid``` Service UID, for VPN service set ```1```
* ```-price_unit``` Set 2 for Seconds, 1 for Megabytes
* ```-price_token``` Token ticker
* ```-price``` Price for one unit, price for one second in our example

Important: if you set price in configs for units set, 3600 in our example - here you set price for your single one unit, for one second in example.

More details about order operations you could find with call ```sudo /opt/cellframe-node/bin/cellframe-node-cli help net_srv```
More details about cellframe node commands in call ```sudo /opt/cellframe-node/bin/cellframe-node-cli help```