diff --git a/README.md b/README.md
index af904ee..1b83014 100644
--- a/README.md
+++ b/README.md
@@ -1,37 +1,142 @@
-# template-bash
+# openvpn-management
 
-Template repository for projects on bash
+OpenVPN management and monitoring utils.
 
-* [`script.sh`](https://git.hmp.today/pavel.muhortov/template-bash#script-sh)
+* [`ovpn-cert-expiration`.sh](https://git.hmp.today/pavel.muhortov/openvpn-management#ovpn-cert-expiration-sh)
+* [`ovpn-client-management`.sh](https://git.hmp.today/pavel.muhortov/openvpn-management#ovpn-client-management-sh)
+* [`ovpn-connect-handling`.sh](https://git.hmp.today/pavel.muhortov/openvpn-management#ovpn-connect-handling-sh)
 
 ____
 
-## `script.sh`
+## `ovpn-cert-expiration`.sh
 
 **Description:**  
-> returning current username if privileged rights are exist  
-> or  
-> returning error, if privileged rights are not exist
+> Checking openvpn server certificates expiration and preparing stats for monitoring.  
 
 **Dependencies:**  
 >
-> * [bash](https://www.gnu.org/software/bash/) (tested version 5.1.4 on [Debian GNU/Linux 11](http://ftp.debian.org/debian/dists/bullseye/))
-> * [whoami](https://www.gnu.org/software/coreutils/whoami) (tested version 8.30 on [Debian GNU/Linux 11](http://ftp.debian.org/debian/dists/bullseye/))
+> * privileged rights
+> * [openssl](https://www.openssl.org/) (tested version 1.1.1k on [Debian GNU/Linux 11](http://ftp.debian.org/debian/dists/bullseye/))
 
 |  POSITION | PARAMETERS   |       DESCRIPTION      |    DEFAULT    |
 |-----------|--------------|------------------------|---------------|
 |     1     |**[qn]**|execution without pauses||
-|     2     |**[/path/to/conf]**|path to config|`./script.conf`|
+|     2     |**[/path/to/conf]**|openvpn server config file path|/etc/openvpn/server/server.conf|
 
-Example usage in terminal with bash:
+Example usage:  
 
 ```bash
-bash ./script.sh qn ./script.conf
+# download
+sudo wget https://git.hmp.today/pavel.muhortov/openvpn-management/raw/branch/master/ovpn-cert-expiration.sh -O /etc/openvpn/server/ovpn-cert-expiration.sh
+sudo chmod +x /etc/openvpn/server/ovpn-cert-expiration.sh
 ```
 
-Example usage in terminal with make the script executable:
-
 ```bash
-chmod u+x ./script.sh
-script.sh
+# sudo crontab -e
+0 * * * * bash /etc/openvpn/server/ovpn-cert-expiration.sh qn
+```
+
+```bash
+# check stats
+watch cat /var/log/openvpn/ovpn-cert-expiration.log
+```
+
+____
+
+## `ovpn-client-management`.sh
+
+**Description:**  
+> Creating or deleting client config for openvpn and sending config and info to email.  
+
+**Dependencies:**  
+>
+> * privileged rights
+> * chpasswd
+> * [openvpn](https://openvpn.net/) (tested version 2.5.1 on [Debian GNU/Linux 11](http://ftp.debian.org/debian/dists/bullseye/))
+> * [easy-rsa](https://github.com/OpenVPN/easy-rsa) (tested version 3.0.8 on [Debian GNU/Linux 11](http://ftp.debian.org/debian/dists/bullseye/))
+> * tar
+> * [Python 3](https://www.python.org/downloads/) (tested version 3.9.5 on [Debian GNU/Linux 11](http://ftp.debian.org/debian/dists/bullseye/))
+> * existing [/usr/local/bin/sendmail.py](https://git.hmp.today/pavel.muhortov/utils#sendmail-py)
+
+|  POSITION | PARAMETERS   |       DESCRIPTION      |    DEFAULT    |
+|-----------|--------------|------------------------|---------------|
+|     1     |**add\|del**|add or delete client config|**REQUIRED**|
+|     2     |**\<username\>**|client username|**REQUIRED**|
+|     3     |**\<password\>**|client password||
+|     4     |**[-f]**,**[--force]**|service will restart after username delete||
+
+Example usage:  
+
+```bash
+# download
+sudo wget https://git.hmp.today/pavel.muhortov/openvpn-management/raw/branch/master/ovpn-client-management.sh -O /etc/openvpn/server/ovpn-client-management.sh
+sudo chmod +x /etc/openvpn/server/ovpn-client-management.sh
+```
+
+```bash
+# create link
+ln -s /etc/openvpn/server/ovpn-client-management.sh ./ovpn
+```
+
+```bash
+# create client
+sudo ./ovpn add username password
+```
+
+```bash
+# delete client (and restart service for applying changes)
+sudo  ./ovpn del username -f
+```
+
+```bash
+# check journal
+tail -f /var/log/openvpn/ovpn.log
+```
+
+____
+
+## `ovpn-connect-handling`.sh
+
+**Description:**  
+> Handling client connection and preparing stats for monitoring.  
+
+**Dependencies:**  
+>
+> * executing by [openvpn](https://openvpn.net/) server (tested version 2.5.1 on [Debian GNU/Linux 11](http://ftp.debian.org/debian/dists/bullseye/))
+> * [jq](https://github.com/stedolan/jq) (tested version 1.6 on [Debian GNU/Linux 11](http://ftp.debian.org/debian/dists/bullseye/))
+> * [grepcidr](https://github.com/ryantig/grepcidr) (tested version 2.0 on [Debian GNU/Linux 11](http://ftp.debian.org/debian/dists/bullseye/))
+> * [Python 3](https://www.python.org/downloads/) (tested version 3.9.5 on [Debian GNU/Linux 11](http://ftp.debian.org/debian/dists/bullseye/))
+> * existing [/usr/local/bin/sendmail.py](https://git.hmp.today/pavel.muhortov/utils#sendmail-py)
+> * [bash](https://www.gnu.org/software/bash/) (tested versions: 5.1.4 on [Debian GNU/Linux 11](http://ftp.debian.org/debian/dists/bullseye/), 5.0.17 on [Ubuntu 20](https://wiki.ubuntu.com/FocalFossa/ReleaseNotes), 4.2.46 on [CentOS 7](https://wiki.centos.org/Manuals/ReleaseNotes/CentOS7.2009))
+
+|  POSITION | PARAMETERS   |       DESCRIPTION      |    DEFAULT    |
+|-----------|--------------|------------------------|---------------|
+|     1     |**inc\|dec**|increment or decrement counter|**REQUIRED**|
+|     2     |**</path/to/dir>**|root path for counter, names, log|**REQUIRED**|
+|     3     |**[mail]**|send email notification||
+|     4     |**[geo]**|check client address geolocation||
+
+Example usage:  
+
+```bash
+# download
+sudo wget https://git.hmp.today/pavel.muhortov/openvpn-management/raw/branch/master/ovpn-connect-handling.sh -O /etc/openvpn/server/ovpn-connect-handling.sh
+sudo chmod +x /etc/openvpn/server/ovpn-connect-handling.sh
+```
+
+```bash
+# add options to openvpn server config file
+sudo tee -a /etc/openvpn/server/server.conf > /dev/null <<'EOF'
+script-security 2
+client-connect "/etc/openvpn/server/ovpn-connect-handling.sh inc /var/log/openvpn mail geo"
+client-disconnect "/etc/openvpn/server/ovpn-connect-handling.sh dec /var/log/openvpn - -"
+EOF
+sudo systemctl restart openvpn@server
+```
+
+```bash
+# check counter and names
+watch cat /var/log/openvpn/openvpn-counts.log
+# check journal
+tail -f /var/log/openvpn/ovpn-connect-handling.log
 ```
diff --git a/script.sh b/ovpn-cert-expiration.sh
similarity index 57%
rename from script.sh
rename to ovpn-cert-expiration.sh
index 60f4d6b..fc75703 100644
--- a/script.sh
+++ b/ovpn-cert-expiration.sh
@@ -1,16 +1,17 @@
 #! /bin/bash
 
 # DESCRIPTION:
-#   returning current username if privileged rights are exist
-#   or
-#   returning error, if privileged rights are not exist
+#   checking openvpn server certificates expiration
+#   and
+#   preparing stats for monitoring
 #
 # DEPENDENCIES:
-#   - whoami
+#   - privileged rights
+#   - openssl
 #
 # PARAMETERS:
 #   1: "qn" - execution without pauses
-#   2: custom configuration file path
+#   2: openvpn server config file path
 #
 # FUNCTIONS:
 #
@@ -72,7 +73,9 @@ execerror() {
 #   None
 #######################################
 getconfig() {
-  logs=$(grep "logs=" "${conf}" | cut -d= -f2)
+  cacrpath=$(grep ^ca "${conf}" | cut -d' ' -f2)
+  certpath=$(grep ^cert "${conf}" | cut -d' ' -f2)
+  statfile="$(dirname "$(grep ^log /etc/openvpn/server/server.conf | cut -d' ' -f2)")/$(basename -s .sh "$0").log"
 }
 
 #######################################
@@ -92,34 +95,55 @@ checkroot() {
   fi
 }
 
+#######################################
+# Print certificate expiration date in epoch
+# Globals:
+#   None
+# Arguments:
+#   1: certificate path
+#######################################
+checkcert() {
+  printf '%s\n' "$(date -d "$(openssl x509 -text -noout -in "${1}" | grep 'Not After' | cut -d':' -f2-)" +%s)"
+}
+
 #
 # VARIABLES:
 #
 
 show=$1
 conf=$2
+logs=/dev/null
 if [ -z "${conf}" ] || [ "${conf}" == "-" ]; then
-  conf="$(dirname "$(realpath "$0")")/$(basename -s .sh "$0").conf"
+  conf=/etc/openvpn/server/server.conf
 fi
 
 time=$(date +%s)
 cd "$(dirname "$(realpath "$0")")" || execerror
 if [ ! -e "${conf}" ]; then
-  :
+  execerror "${conf} not found"
 else
   getconfig
 fi
-if [ -z "${logs}" ]; then
-  logs=/dev/null
-elif [ ! -e "${logs}" ]; then
-  touch "${logs}"
+
+if ! command -v openssl &> /dev/null; then
+  execerror "Not found dependencies"
 fi
 
 #
 # MAIN:
 #
 
-checkroot \
-&& echo "Running as $(whoami)" \
-&& execquite \
-|| execerror "Restart this as root!"
+if checkroot; then
+  cacrtime=$(checkcert "${cacrpath}")
+  certtime=$(checkcert "${certpath}")
+  cacrremain=$(( cacrtime - time ))
+  certremain=$(( certtime - time))
+  addtologs "${cacrpath} remains only ${cacrremain} seconds"
+  addtologs "${certpath} remains only ${certremain} seconds"
+  printf '%s\n' "ca=${cacrremain}" > "${statfile}"
+  printf '%s\n' "cert=${certremain}" >> "${statfile}"
+  addtologs  "stats wrote to ${statfile}"
+  execquite
+else
+  execerror "Restart this as root!"
+fi
diff --git a/ovpn-client-management.sh b/ovpn-client-management.sh
new file mode 100644
index 0000000..1159274
--- /dev/null
+++ b/ovpn-client-management.sh
@@ -0,0 +1,353 @@
+#! /bin/bash
+
+# DESCRIPTION:
+#   creating or deleting client config for openvpn
+#   and
+#   sending config and info to email
+#
+# DEPENDENCIES:
+#   - privileged rights
+#   - chpasswd
+#   - openvpn
+#   - easy-rsa
+#   - tar
+#   - Python 3
+#   - existing /usr/local/bin/sendmail.py
+#
+# PARAMETERS:
+#   1: "add|del" - add or delete client config
+#   2: username - client username
+#   3: password - client password
+#   -f|--force - service will restart after username delete
+#
+# FUNCTIONS:
+#
+
+#######################################
+# Print message and add to log.
+# Globals:
+#   logs
+# Arguments:
+#   1: message to print and logging
+#######################################
+addtologs() {
+  echo "$(date +'%Y.%m.%d-%H:%M:%S') $1" | tee -a "${logs}"
+}
+
+#######################################
+# Exit procedure.
+# Globals:
+#   show
+# Arguments:
+#   None
+#######################################
+execquite() {
+  addtologs "execution time is $(($(date +%s)-time)) seconds, exit"
+  exit
+}
+
+#######################################
+# Error exit procedure
+# Globals:
+#   None
+# Arguments:
+#   1: message to print and logging
+#######################################
+execerror() {
+  addtologs "error: $1"
+  execquite
+}
+
+#######################################
+# Checking user rights.
+# Globals:
+#   None
+# Arguments:
+#   None
+# return:
+#   0 - if privileged rights, 1 - if not privileged rights
+#######################################
+checkroot() {
+  if [ "${EUID}" -ne 0 ]; then
+    return 1 # false
+  else
+    return 0 # true
+  fi
+}
+
+#######################################
+# Creating linux user
+# Globals:
+#   clientname
+#   clientpass
+# Arguments:
+#   None
+#######################################
+createuser() {
+  useradd "${clientname}" --shell /sbin/nologin
+  echo "${clientname}:${clientpass}" | chpasswd
+}
+
+#######################################
+# Creating Easy-RSA user certificate
+# Globals:
+#   easyrsadir
+#   easyrsavar
+#   easyrsaexe
+#   easyrsacap
+#   clientname
+#   clientpass
+# Arguments:
+#   None
+#######################################
+# shellcheck disable=SC2016
+createcert() {
+    cd ${easyrsadir} || execerror ""
+    sed -i -e '$aset_var EASYRSA_REQ_CN         '"${clientname}"'' ${easyrsavar}
+    ${easyrsaexe} --passout=pass:"${clientpass}" --passin=pass:${easyrsacap} build-client-full "${clientname}"
+    sed -i '/EASYRSA_REQ_CN/d' ${easyrsavar}
+}
+
+#######################################
+# Creating ovpn config file
+# Globals:
+#   easyrsadir
+#   ovpncfgdef
+#   clientname
+#   ovpncfgdir
+# Arguments:
+#   None
+#######################################
+createovpn() {
+  cd ${easyrsadir} || execerror ""
+  {
+    cat "${ovpncfgdef}"
+    echo -e '<ca>'
+    cat "${easyrsadir}/pki/ca.crt"
+    echo -e '</ca>\n<cert>'
+    cat "${easyrsadir}/pki/issued/${clientname}.crt"
+    echo -e '</cert>\n<key>'
+    cat "${easyrsadir}/pki/private/${clientname}.key"
+    echo -e '</key>\n<tls-auth>'
+    cat "${easyrsadir}/pki/ta.key"
+    echo -e '</tls-auth>'
+  } >> "${ovpncfgdir}/${clientname}.ovpn"
+}
+
+#######################################
+# Creating tar with config file
+# Globals:
+#   easyrsadir
+#   clientname
+#   ovpncfgdir
+# Arguments:
+#   None
+#######################################
+createtars() {
+  cp "${ovpncfgdir}/${clientname}.ovpn" "${ovpncfgdir}/vpn.cnf"
+  sed -i "s#auth-user-pass#auth-user-pass /config/openvpn/vpn.txt#g" ${ovpncfgdir}/vpn.cnf
+  {
+    echo -e "${clientname}"
+    echo -e "${clientpass}"
+  } >> "${ovpncfgdir}/vpn.txt"
+  cd ${ovpncfgdir} || execerror ""
+  tar cf "${clientname}.tar" --remove-files vpn.cnf vpn.txt
+}
+
+#######################################
+# Creating info file
+# Globals:
+#   easyrsadir
+#   easyrsaexe
+#   clientname
+#   ovpncfgdir
+# Arguments:
+#   None
+#######################################
+createinfo() {
+  cd ${easyrsadir} || execerror
+  validuntil=$(${easyrsaexe} show-cert "${clientname}" | grep "Not After" | cut -d: -f2-)
+
+faqprofile=$(cat <<END
+OpenVPN Connect client and installation instructions:
+https://openvpn.net/vpn-client/
+OpenVPN GUI client:
+https://openvpn.net/community-downloads/
+
+User Login: ${clientname}
+User Password: ${clientpass}
+Time Expired: ${validuntil}
+END
+)
+
+  echo -e "${faqprofile}" > "${ovpncfgdir}/${clientname}.info"
+}
+
+#######################################
+# Send email notification about client connect
+# Globals:
+#   clientname
+#   faqprofile
+#   ovpncfgdir
+# Arguments:
+#   None
+#######################################
+startsendmail() {
+  subj="[OVPN Settings] $(cat /etc/hostname): ${clientname}.ovpn client profile"
+  (
+    python3 /usr/local/bin/sendmail.py \
+    -u "$(grep "from=" /usr/local/bin/sendmail.config | cut -d= -f2)" \
+    -p "$(grep "pass=" /usr/local/bin/sendmail.config | cut -d= -f2)" \
+    -d "$(grep "dest=" /usr/local/bin/sendmail.config | cut -d= -f2)" \
+    --smtp "$(grep "smtp=" /usr/local/bin/sendmail.config | cut -d= -f2)" \
+    --port "$(grep "port=" /usr/local/bin/sendmail.config | cut -d= -f2)" \
+    --stls "True" \
+    --subj "${subj}" \
+    --text "${faqprofile}" \
+    --file "${ovpncfgdir}/${clientname}.ovpn,${ovpncfgdir}/${clientname}.tar" \
+    >> /dev/null 2>&1 &
+  )
+  addtologs "sent mail with subject '${subj}'"
+}
+
+#######################################
+# Deleting linux user
+# Globals:
+#   clientname
+# Arguments:
+#   None
+#######################################
+deleteuser() {
+  userdel -f -r "${clientname}"
+}
+
+#######################################
+# Deleting Easy-RSA user certificate
+# Globals:
+#   easyrsadir
+#   easyrsavar
+#   easyrsaexe
+#   easyrsacap
+#   clientname
+# Arguments:
+#   None
+#######################################
+deletecert() {
+    cd ${easyrsadir} || execerror
+    ${easyrsaexe} --batch --passin=pass:${easyrsacap} revoke "${clientname}"
+    ${easyrsaexe} --batch --passin=pass:${easyrsacap} gen-crl
+}
+
+#######################################
+# Deleting ovpn config file
+# Globals:
+#   clientname
+#   ovpncfgdir
+# Arguments:
+#   None
+#######################################
+deleteovpn() {
+    rm -f "${ovpncfgdir}/${clientname}.ovpn"
+}
+
+#######################################
+# Deleting tar with config file
+# Globals:
+#   clientname
+#   ovpncfgdir
+# Arguments:
+#   None
+#######################################
+deletetars() {
+  rm -f "${ovpncfgdir}/${clientname}.tar"
+}
+
+#######################################
+# Deleting info file
+# Globals:
+#   clientname
+#   ovpncfgdir
+# Arguments:
+#   None
+#######################################
+deleteinfo() {
+  rm -f "${ovpncfgdir}/${clientname}.info"
+}
+
+#
+# VARIABLES:
+#
+
+easyrsadir="/etc/openvpn/easy-rsa"
+easyrsaidx="${easyrsadir}/pki/index.txt"
+easyrsaexe="${easyrsadir}/easyrsa"
+easyrsavar="${easyrsadir}/vars"
+easyrsacap="openvpnca"
+ovpncfgdir="/etc/openvpn/client"
+ovpncfgdef="${ovpncfgdir}/client.conf.default"
+
+clienttodo=$1
+clientname=$2
+clientpass=$3
+
+resetforce=0
+for argument in "${@}"; do
+  case $argument in
+  -f | --force )
+    resetforce=1
+    ;;
+  -* )
+    ;;
+  esac
+done
+
+time=$(date +%s)
+logs=/dev/null
+
+#
+# MAIN:
+#
+
+if checkroot; then
+  logs=/var/log/openvpn/$(basename -s .sh "$0").log
+  if [ "${clienttodo}" == "add" ] && \
+     [ -n "${clientname}" ] && \
+     [ "${#clientpass}" -ge 8 ]; then
+    if id -u "${clientname}" >/dev/null 2>&1 || \
+       grep -w "${clientname}" ${easyrsaidx} || \
+       [ -e "${ovpncfgdir}/${clientname}.ovpn" ]; then
+      execerror "linux user or certificate or ovpn config exist, exit"
+    else
+      createuser && addtologs "created Linux user '${clientname}'"
+      createcert && addtologs "created certificate for ${clientname}"
+      createovpn && addtologs "created ovpn config file for ${clientname}"
+      createtars && addtologs "created tar with config file for ${clientname}"
+      createinfo && addtologs "created info file for ${clientname}"
+      startsendmail
+    fi
+  elif [ "${clienttodo}" == "del" ] && [ -n "${clientname}" ]; then
+    if id -u "${clientname}" >/dev/null 2>&1 || \
+       grep -w "${clientname}" ${easyrsaidx} || \
+       [ -e "${ovpncfgdir}/${clientname}.ovpn" ]; then
+      deleteuser
+      addtologs "deleted Linux user '${clientname}'"
+      deletecert && addtologs "deleted certificate for ${clientname}"
+      deleteovpn && addtologs "deleted ovpn config file for ${clientname}"
+      deletetars && addtologs "deleted tar with config file for ${clientname}"
+      deleteinfo && addtologs "deleted info file for ${clientname}"
+      if [ "${resetforce}" -eq 1 ];then
+        addtologs "restarting openvpn@server..."
+        systemctl restart openvpn@server
+      fi
+    else
+      execerror "linux user and certificate and ovpn config not exist, exit"
+    fi
+  else
+    printf "%s\n" "Usage example: $0 'add' 'username(surname)' 'password(not less 8 symbols)'"
+    printf "%s\n" "Usage example: $0 'del' 'username(surname)'"
+    printf "%s\n" "Usage example: $0 'del' 'username(surname)' -f"
+  fi
+else
+  execerror "Restart this as root!"
+fi
+execquite
diff --git a/ovpn-connect-handling.sh b/ovpn-connect-handling.sh
new file mode 100644
index 0000000..96e05e4
--- /dev/null
+++ b/ovpn-connect-handling.sh
@@ -0,0 +1,195 @@
+#! /bin/bash
+
+# DESCRIPTION:
+#   handling client connection
+#   and
+#   preparing stats for monitoring
+#
+# DEPENDENCIES:
+#   - executing by openvpn server
+#   - jq
+#   - grepcidr
+#   - Python 3
+#   - existing /usr/local/bin/sendmail.py
+#
+# PARAMETERS:
+#   1: "inc|dec" - increment or decrement counter
+#   2: root path for counter, names, log
+#   3: "mail" - send email notification
+#   4: "geo" - check client address geolocation
+#
+# FUNCTIONS:
+#
+
+#######################################
+# Print message and add to log.
+# Globals:
+#   logs
+# Arguments:
+#   1: message to print and logging
+#######################################
+addtologs() {
+  echo "$(date +'%Y.%m.%d-%H:%M:%S') $1" | tee -a "${logs}"
+}
+
+#######################################
+# Exit procedure.
+# Globals:
+#   show
+# Arguments:
+#   None
+#######################################
+execquite() {
+  addtologs "execution time is $(($(date +%s)-time)) seconds, exit"
+  exit
+}
+
+#######################################
+# Error exit procedure
+# Globals:
+#   None
+# Arguments:
+#   1: message to print and logging
+#######################################
+execerror() {
+  addtologs "error: $1"
+  execquite
+}
+
+#######################################
+# Incrementing counter with adding client name
+# Globals:
+#   counts_file
+#   common_name (variable by openvpn server)
+#   ifconfig_pool_remote_ip (variable by openvpn server)
+# Arguments:
+#   None
+#######################################
+# shellcheck disable=SC2154
+incremcounter() {
+  summary_cur=$(grep 'total=' "${counts_file}" | cut -d= -f2)
+  summary_new=${summary_cur} && (( summary_new += 1 ))
+  counts_temp=$(sed -e "s/total=${summary_cur}/total=${summary_new}/g" "${counts_file}" \
+              | sed -e '$a'"${common_name}"'_'"${ifconfig_pool_remote_ip}"'')
+  addtologs "client ${common_name} connected, counter increment to ${summary_new}"
+  printf "%s\n" "${counts_temp}" > "${counts_file}"
+}
+
+#######################################
+# Decrementing counter with deleting client name
+# Globals:
+#   counts_file
+#   common_name (variable by openvpn server)
+# Arguments:
+#   None
+#######################################
+decremcounter(){
+  summary_cur=$(grep 'total=' "${counts_file}" | cut -d= -f2)
+  summary_new=${summary_cur} && (( summary_new -= 1 ))
+  counts_temp=$(sed -e "s/total=${summary_cur}/total=${summary_new}/g" "${counts_file}" \
+              | sed '0,/'"${common_name}"'/{/'"${common_name}"'/d}')
+  addtologs "client ${common_name} disconnected, counter decrement to ${summary_new}"
+  printf "%s\n" "${counts_temp}" > "${counts_file}"
+}
+
+#######################################
+# Get information about client address
+# Globals:
+#   flaggeol
+#   untrusted_ip (variable by openvpn server)
+# Arguments:
+#   None
+#######################################
+# shellcheck disable=SC2154
+expandaddress() {
+  ipinfo="Source address is ${untrusted_ip}"
+  localnetworks="10.0.0.0/8
+                 100.64.0.0/10
+                 127.0.0.1/8
+                 172.16.0.0/12
+                 192.168.0.0/16
+                "
+  if ! grepcidr "${localnetworks}" <(echo "${untrusted_ip}") >/dev/null; then
+    if [ "${flaggeol}" == "geo" ]; then
+      ipinfo=$(curl "https://api.ipbase.com/v1/json/${untrusted_ip}")
+      if [ "$(jq -r '.country_name' <<< "$ipinfo")" != "" ]; then
+        z=$(jq -r '.zip_code' <<< "$ipinfo")
+        c=$(jq -r '.country_name' <<< "$ipinfo")
+        r=$(jq -r '.region_name' <<< "$ipinfo")
+        t=$(jq -r '.city' <<< "$ipinfo")
+        ipinfo="Source address ${untrusted_ip} is from ${z}, ${c}, ${r}, ${t}"
+      fi
+    fi
+  fi
+  addtologs "client ${common_name} checked. ${ipinfo}"
+}
+
+#######################################
+# Send email notification about client connect
+# Globals:
+#   ipinfo
+#   common_name (variable by openvpn server)
+#   ifconfig_pool_remote_ip (variable by openvpn server)
+# Arguments:
+#   None
+#######################################
+startsendmail() {
+  subj="[VPN Connected] $(cat /etc/hostname): ${common_name} connect to ${ifconfig_pool_remote_ip}"
+  (
+    python3 /usr/local/bin/sendmail.py \
+    -u "$(grep "from=" /usr/local/bin/sendmail.config | cut -d= -f2)" \
+    -p "$(grep "pass=" /usr/local/bin/sendmail.config | cut -d= -f2)" \
+    -d "$(grep "dest=" /usr/local/bin/sendmail.config | cut -d= -f2)" \
+    --smtp "$(grep "smtp=" /usr/local/bin/sendmail.config | cut -d= -f2)" \
+    --port "$(grep "port=" /usr/local/bin/sendmail.config | cut -d= -f2)" \
+    --stls "True" \
+    --subj "${subj}" \
+    --text "${ipinfo}" \
+    >> /dev/null 2>&1 &
+  )
+  addtologs "sent mail with subject '${subj}'"
+}
+
+#
+# VARIABLES:
+#
+
+flagmath=$1
+pathroot=$2
+flagmail=$3
+flaggeol=$4
+
+time=$(date +%s)
+logs="${pathroot}/$(basename -s .sh "$0").log"
+counts_file="${pathroot}/ovpn-counts.log"
+if [ -z "${pathroot}" ]; then
+  logs=/dev/null
+  execerror "Usage example: $0 'inc|dec' '/var/log/openvpn' '-' '-'"
+elif [ ! -e "${logs}" ]; then
+  touch "${logs}"
+fi
+
+if ! command -v curl &> /dev/null || \
+  ! command -v /usr/local/bin/sendmail.py &> /dev/null || \
+  ! command -v python3 &> /dev/null || \
+  ! command -v grepcidr &> /dev/null || \
+  ! command -v jq &> /dev/null; then
+  execerror "Not found dependencies"
+fi
+
+#
+# MAIN:
+#
+
+if [ "${flagmath}" == "inc" ]; then
+  incremcounter
+  expandaddress
+  if [ "${flagmail}" == "mail" ]; then
+    startsendmail
+  fi
+elif [ "${flagmath}" == "dec" ]; then
+  decremcounter
+else
+  execerror "Usage example: $0 'inc|dec' '/var/log/openvpn' '-' '-'"
+fi
+execquite