feat(server): support server mode

[knqyf263]

What did you implement:

Support server mode

How did you implement it:

Add server subcommand.

Support application/json and text/plain.
In the case of text/plain, X-Vuls-OS-Family, X-Vuls-OS-Release and X-Vuls-Kernel-Release headers are required.

Support OS: RHEL/CentOS/Debian/CentOS

How can we verify it:

Prepare Vuls server

$ vuls server -listen 0.0.0.0:5515
[Jul  5 22:32:46]  INFO [localhost] Validating config...
...
[Jul  5 22:32:46]  INFO [localhost] Listening on 0.0.0.0:5515

CentOS

text/plain

CentOS 6

$ ssh vuls@centos6
$ curl -X POST -H "Content-Type: text/plain" -H "X-Vuls-OS-Family: `awk '{print tolower($1)}' /etc/redhat-release`" -H "X-Vuls-OS-Release: `awk '{print $3}' /etc/r
edhat-release`" -H "X-Vuls-Kernel-Release: `uname -r`" --data-binary "`rpm -qa --queryformat "%{NAME} %{EPOCHNUM} %{VERSION} %{RELEASE} %{ARCH}\n"`" http://192.168.33.1:5515/

application/json

$ cat centos6.json
{
  "Family": "centos",
  "Release": "6.9",
  "RunningKernel": {
    "Release": "2.6.32-696.6.3.el6.x86_64",
    "Version": "",
    "RebootRequired": false
  },
  "Packages": {
    "ntp": {
      "Name": "ntp",
      "Version": "4.2.6p5"
    }
  }
}
$ curl -X POST -H "Content-Type: application/json" -d @centos.json http://localhost:5515

Debian

text/plain

When Debian, X-Vuls-Kernel-Release is also required.

$ ssh vuls@debian8
$ curl -X POST -H "Content-Type: text/plain" -H "X-Vuls-OS-Family: debian" -H "X-Vuls-OS-Release: 8.10" -H "X-Vuls-Kernel-Release: `uname -r`" -H "X-Vuls-Kernel-Version: `uname -a | awk '{print $7}'`" --data-binary "$(dpkg-query -W -f="\${binary:Package},\${db:Status-Abbrev},\${Version},\${Source},\${source:Version}\n")" http://192.168.33.1:5515/

application/json

$ cat debian8.json
{
  "Family": "debian",
  "Release": "8.10",
  "RunningKernel": {
    "Release": "3.16.0-4-amd64",
    "Version": "3.16.51-2",
    "RebootRequired": false
  },
  "Packages": {
    "bind9-host": {
      "Name": "bind9-host",
      "Version": "1:9.9.5.dfsg-9+deb8u15"
    }
  },
  "SrcPackages": {
    "bind9": {
      "Name": "bind9",
      "Version": "1:9.9.5.dfsg-9+deb8u15",
      "BinaryNames": [
        "bind9-host"
      ]
    }
  }
}
$ curl -X POST -H "Content-Type: application/json" -d @debian8.json http://localhost:5515

Ubuntu

text/plain

$ curl -X POST -H "Content-Type: text/plain" -H "X-Vuls-OS-Family: ubuntu" -H "X-Vuls-OS-Release: 16.04" -H "X-Vuls-Kernel-Release: `uname -r`" --data-binary "$(dpkg-query -W -f="\${binary:Package},\${db:Status-Abbrev},\${Version},\${Source},\${source:Version}\n")" http://192.168.33.1:5515/

application/json

Almost the same as Debian.
No need for RunningKernel.Version.

$ cat ubuntu1604.json
{
  "Family": "ubuntu",
  "Release": "16.04",
  "RunningKernel": {
    "Release": "3.16.0-4-amd64",
    "RebootRequired": false
  },
  "Packages": {
    "bind9-host": {
      "Name": "bind9-host",
      "Version": "1:9.9.5.dfsg-9+deb8u15"
    }
  },
  "SrcPackages": {
    "bind9": {
      "Name": "bind9",
      "Version": "1:9.9.5.dfsg-9+deb8u15",
      "BinaryNames": [
        "bind9-host"
      ]
    }
  }
}
$ curl -X POST -H "Content-Type: application/json" http://localhost:5515 -d @ubuntu1604.json

Todos:

You don't have to satisfy all of the following.

• Write tests
• Write documentation
• Check that there aren't other open pull requests for the same issue/feature
• Format your source code by make fmt
• Pass the test by make test
• Provide verification config / commands
• Enable "Allow edits from maintainers" for this PR
• Update the messages below

Is this ready for review?: NO
Is it a breaking change?: NO

[kotakanbe]

#478