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[[TOC]]

Building the webserver

back-end (the http server) and front-end (the html and javascript code for the browsers) are both built when the build of the websrv optional library is requested.

You can include the web server interface components in your build using the build_oai script with the --build-lib "telnetsrv websrv" option. The related cmake cache entry in ran_build/build/CMakeCache.txt for building the web server is ENABLE_WEBSRV:BOOL=ON

When cmake configuration has been completed, with websrv enabled and all dependencies met, font-end and back-end can be built separately, using respectively make websrvfront or make websrv from the build repository (replace make by ninja if you build using ninja).

Additional dependencies for the backend

To build the webserver frontend, you need additionally

  1. the ulfius library
  2. the jansson library

These libraries are not handled by build_oai -I

Ubuntu

$ sudo apt-get update
$ sudo apt-get install -y libulfius-dev libjansson-dev npm curl wget

Fedora(-based OS)

$ sudo dnf update -y
$ sudo dnf install -y jansson-devel npm curl wget

ulfius has to be installed as explained here.

Install from source if needed

sudo dnf install -y jansson-devel npm curl wget libmicrohttpd-devel curl curlpp-devel systemd-devel
git clone https://github.com/babelouest/orcania.git
cd orcania; mkdir build; cd build; cmake ..; sudo make install
cd
git clone https://github.com/babelouest/yder.git
cd yder ; mkdir build; cd build; cmake ..; sudo make install
git clone https://github.com/babelouest/ulfius.git
cd ulfius
mkdir build; cd build; cmake ..; sudo make install

Additional dependencies for the frontend

Currently the web server frontend can run with nodejs 18, you can check the version (if any) installed on your system entering the node -v command.

To prevent difficult situations with nodejs or npm versions it is better to specifically install the required nodejs version (after removing existing versions of npm and nodejs), as explained here for ubuntu. Similar instructions can be found for other distributions. It is also possible to make several nodejs versions co-habiting on your system, this is beyond this doc.

For example, to install a specific nodeJS version, you can run the below command, with the typical output printed below for your convenience:

install method by nvm

curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.3/install.sh | bash
source ~/.bashrc
nvm install 18
nvm use 18

install by apt-get

$ curl -s https://deb.nodesource.com/setup_18.x | sudo bash

## Populating apt-get cache...

apt-get update

## Confirming "jammy" is supported...

+ curl -sLf -o /dev/null 'https://deb.nodesource.com/node_18.x/dists/jammy/Release'

## Adding the NodeSource signing key to your keyring...

+ curl -s https://deb.nodesource.com/gpgkey/nodesource.gpg.key | gpg --dearmor | tee /usr/share/keyrings/nodesource.gpg >/dev/null

## Creating apt sources list file for the NodeSource Node.js 18.x repo...

+ echo 'deb [signed-by=/usr/share/keyrings/nodesource.gpg] https://deb.nodesource.com/node_18.x jammy main' > /etc/apt/sources.list.d/nodesource.list
+ echo 'deb-src [signed-by=/usr/share/keyrings/nodesource.gpg] https://deb.nodesource.com/node_18.x jammy main' >> /etc/apt/sources.list.d/nodesource.list

## Running `apt-get update` for you...

+ apt-get update
## Run `sudo apt-get install -y nodejs` to install Node.js 18.x and npm
## You may also need development tools to build native addons:
     sudo apt-get install gcc g++ make
## To install the Yarn package manager, run:
     curl -sL https://dl.yarnpkg.com/debian/pubkey.gpg | gpg --dearmor | sudo tee /usr/share/keyrings/yarnkey.gpg >/dev/null
     echo "deb [signed-by=/usr/share/keyrings/yarnkey.gpg] https://dl.yarnpkg.com/debian stable main" | sudo tee /etc/apt/sources.list.d/yarn.list
     sudo apt-get update && sudo apt-get install yarn


sudo apt install nodejs -y
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
The following packages were automatically installed and are no longer required:
  diodon libdiodon0 libxdo3 xdotool
Use 'sudo apt autoremove' to remove them.
The following NEW packages will be installed:
  nodejs
0 upgraded, 1 newly installed, 0 to remove and 8 not upgraded.
Need to get 28.9 MB of archives.
After this operation, 188 MB of additional disk space will be used.
Get:1 https://deb.nodesource.com/node_18.x jammy/main amd64 nodejs amd64 18.17.1-deb-1nodesource1 [28.9 MB]
Fetched 28.9 MB in 3s (11.3 MB/s)  
Selecting previously unselected package nodejs.
(Reading database ... 399541 files and directories currently installed.)
Preparing to unpack .../nodejs_18.17.1-deb-1nodesource1_amd64.deb ...
Unpacking nodejs (18.17.1-deb-1nodesource1) ...
Setting up nodejs (18.17.1-deb-1nodesource1) ...
Processing triggers for man-db (2.10.2-1) ...

If you want to put a more recent version, refer to the steps below, which is common for any OS:

$ sudo npm -g install @angular/cli@latest npm@latest
$ sudo npm install n -g
# Install the LTS version
$ n lts
# Or install the latest version
$ n latest
$ node --version

Building the webserver

Backend

The websrv targets won't be available till cmake has been successfully configured with the websrv option enabled

$ cd <oai repository>/openairinterface5g/cmake_targets
$ ./build_oai  --build-lib websrv

or, without the help of the build_oai script:

$ cd \<oai repository\>/openairinterface5g/cmake_targets/ran_build/build
$ make websrv

This will create the libwebsrv.so file in the cmake_targets/ran_build/build directory.

Frontend

The frontend targets needs to be triggered explicitly:

$ cd \<oai repository\>/openairinterface5g/cmake_targets/ran_build/build
$ make websrvfront
up to date, audited 1099 packages in 3s

142 packages are looking for funding
  run `npm fund` for details

3 moderate severity vulnerabilities

Some issues need review, and may require choosing
a different dependency.

Run `npm audit` for details.
Built target websrvfront_installjsdep

> softmodemngx@2.0.0 build
> ng build

✔ Browser application bundle generation complete.
✔ Copying assets complete.
✔ Index html generation complete.

Initial Chunk Files           | Names         |  Raw Size | Estimated Transfer Size
main.1917944d43411293.js      | main          | 996.88 kB |               231.03 kB
styles.ca83009174c6585f.css   | styles        |  74.33 kB |                 7.70 kB
polyfills.36a0bc8cdfe2cb81.js | polyfills     |  45.10 kB |                13.82 kB
runtime.bf8117e4a18c7212.js   | runtime       |   1.06 kB |               606 bytes

                              | Initial Total |   1.09 MB |               253.14 kB

Build at: 2022-10-17T16:52:42.517Z - Hash: 3b6b647cfcb0dac9 - Time: 8651ms
Moving frontend files to:
    /usr/local/oai/oai-develop/openairinterface5g/cmake_targets/ran_build/build/websrv
    /usr/local/oai/oai-develop/openairinterface5g/targets/bin/websrv
Built target websrvfront

Examples

build example when back-end dependency is not installed

$ ./build_oai --gNB --nrUE -w USRP --build-lib "telnetsrv websrv nrscope"
[...]
CMake Error at common/utils/websrv/CMakeLists.txt:31 (find_library):
  Could not find ULFIUS using the following names: libulfius.so
-- Configuring incomplete, errors occurred!
See also "/usr/local/oai/develop_unmodified/openairinterface5g/cmake_targets/ran_build/build/CMakeFiles/CMakeOutput.log".
build have failed

build example when front-end dependency is not installed

$ ./build_oai --gNB --nrUE -w USRP --build-lib "telnetsrv websrv nrscope"
[...]
-- found libulfius for websrv
-- found libjansson for websrv
CMake Error at common/utils/websrv/CMakeLists.txt:45 (find_program):
  Could not find NPM using the following names: npm


-- Configuring incomplete, errors occurred!
See also "/usr/local/oai/develop_unmodified/openairinterface5g/cmake_targets/ran_build/build/CMakeFiles/CMakeOutput.log".
build have failed

build example when dependencies are met

$ ./build_oai --ninja -c -C --gNB --nrUE -w USRP --build-lib "telnetsrv websrv nrscope"
[...]
-- found libulfius for websrv
-- found libjansson for websrv
-- found npm for websrv
-- Configuring webserver backend
-- Configuring webserver frontend
[...]
-- Configuring done
-- Generating done
-- Build files have been written to: /usr/local/oai/develop_unmodified/openairinterface5g/cmake_targets/ran_build/build
cd /usr/local/oai/develop_unmodified/openairinterface5g/cmake_targets/ran_build/build
Running "cmake --build .  --target nr-softmodem nr-cuup nr-uesoftmodem oai_usrpdevif telnetsrv websrv nrscope params_libconfig coding rfsimulator dfts -- -j8" 
Log file for compilation is being written to: /usr/local/oai/develop_unmodified/openairinterface5g/cmake_targets/log/all.txt
nr-softmodem nr-cuup nr-uesoftmodem oai_usrpdevif telnetsrv websrv nrscope params_libconfig coding rfsimulator dfts compiled
BUILD SHOULD BE SUCCESSFUL

Running the web server interface

When starting the softmodem, you must specify the --websrv option to load and start the web server. The web server is loaded via the oai shared library loader.

web server parameters

The web server back-end is using the oai configuration module. web server parameters must be specified in the websrv section.

name type default description
listenaddr ipV4 address, ascii format "0.0.0.0" local address the back-end is listening on
listenport integer 8090 port number the server is listening on
debug integer 0 When not 0, http requests headers and json objects dump are added to back-end traces
fpath character string common/utils/websrv The path to on-disk http server resources . The default value matches the front-end installation when running the softmodem from the executables repository.
cert, key, rootca character string null certificates and key used to trigger https protocol (not tested)

running the back-end

To trigger the back-end use the --websrv option, possibly modifying the parameters as explained in the previous section. The two following commands allow starting the oai gNB and the oai 5G UE on the same computer, starting the telnet server and the web interface on both executables.

./nr-softmodem -O /usr/local/oai/conf/gnb.band78.sa.fr1.106PRB.usrpb210.conf --rfsim --rfsimulator.[0].serveraddr server --telnetsrv --telnetsrv.listenstdin --websrv --rfsimulator.[0].options chanmod

./nr-uesoftmodem -O /usr/local/oai/conf/nrue_sim.conf --numerology 1 -r 106 -C 3649440000 --rfsim --rfsimulator.[0].serveraddr 127.0.0.1 --websrv --telnetsrv --websrv.listenport 8092 --telnetsrv.listenport 8091

Connecting from a browser to the oai softmodem's

Assuming that the previous commands run successfully and that you also run your browser on the same host, you should be able to connect to the gNB and UE web interface using respectively the following url's:

http://127.0.0.1:8090/websrv/index.html

http://127.0.0.1:8092/websrv/index.html

The interface should be intuitive enough, keeping in mind the following restrictions:

  • The command tab is not available if the telnet server is not enabled
  • The softscope tab is not available if the xforms scope is started (-d option)
  • Only one connection is supported to a back-end, especially for the scope interface

Some front-end objects, which usage are less intuitive provide a tooltip to help interface usage.

some webserver screenshots

oai web serverinterface home