Implement backup functionality via sftp

bin/v-backup-user

@@ -692,6 +692,158 @@ ftp_backup() {
     fi
 }
 
+# sftp command function
+sftpc() {
+expect -f "-" <<EOF "$@"
+    set timeout 60
+    set count 0
+    spawn /usr/bin/sftp -o StrictHostKeyChecking=no -o Port=$PORT $USERNAME@$HOST
+    expect {
+        "password:" {
+            send "$PASSWORD\r"
+            exp_continue
+        }
+
+        -re "Couldn't|(.*)disconnect|(.*)stalled|(.*)not found" {
+            set count \$argc
+            set output "Disconnected."
+            set rc $E_FTP
+            exp_continue
+        }
+
+        -re ".*denied.*(publickey|password)." {
+            set output "Permission denied, wrong publickey or password."
+            set rc $E_CONNECT
+        }
+
+        -re "\[0-9]*%" {
+            exp_continue
+        }
+
+        "sftp>" {
+            if {\$count < \$argc} {
+                set arg [lindex \$argv \$count]
+                send "\$arg\r"
+                incr count
+            } else {
+                send "exit\r"
+                set output "Disconnected."
+                if {[info exists rc] != 1} {
+                    set rc $OK
+                }
+            }
+            exp_continue    
+        }
+
+        timeout {
+            set output "Connection timeout."
+            set rc $E_CONNECT
+        }
+    }
+
+    if {[info exists output] == 1} {
+        puts "\$output"
+    }
+
+    exit \$rc       
+EOF
+}
+
+sftp_backup() {
+    #Checking expect installation
+    check_expect=$(which expect)
+    if [[ ! -n $check_expect ]]
+    then
+        echo "Error: \"expect\" utility not found"
+        log_event "$E_NOTEXIST" "$EVENT"
+        exit $E_NOTEXIST
+    fi
+
+    # Checking config
+    if [ ! -e "$VESTA/conf/sftp.backup.conf" ]; then
+        sftp_conf_error="Can't open  $VESTA/conf/sftp.backup.conf"
+        echo "$sftp_conf_error" | $send_mail -s "$subj" $email
+        echo "Error: $VESTA/conf/sftp.backup.conf doesn't exist"
+        sed -i "/ $user /d" $VESTA/data/queue/backup.pipe
+        log_event "$E_NOTEXIST" "$EVENT"
+        exit $E_NOTEXIST
+    fi
+
+    # Parse config
+    source $VESTA/conf/sftp.backup.conf
+
+    # Set current data
+    DATE=$(date +%F)
+    TIME=$(date +%T)
+
+    # Set default port
+    if [ -z "$(grep 'PORT=' $VESTA/conf/sftp.backup.conf)" ]; then
+        PORT='22'
+    fi
+
+    # Checking variables
+    if [ -z "$HOST" ] || [ -z "$USERNAME" ] || [ -z "$PASSWORD" ]; then
+        rm -rf $tmpdir
+        echo "Can't parse sftp backup configuration" |\
+            $send_mail -s "$subj" $email
+        echo "Error: Parsing error"
+        sed -i "/ $user /d" $VESTA/data/queue/backup.pipe
+        log_event "$E_PARSING" "$EVENT"
+        exit $E_PARSING
+    fi
+
+    # Debug info
+    echo -e "$(date "+%F %T") Remote: $HOST/$BPATH/$user.$DATE.tar"
+
+    # Checking network connection and write permissions
+    echo -e "$(date "+%F %T") Checking network connection and write permissions ..."
+    sftmpdir="$BPATH/vst.bK76A9SUkt"
+    sftpc "mkdir $BPATH" > /dev/null 2>&1
+    sftpc "mkdir $sftmpdir" "rmdir $sftmpdir" > /dev/null 2>&1
+    rc=$?
+    if [[ "$rc" != 0 ]]
+    then
+        rm -rf $tmpdir
+        case $rc in
+            $E_CONNECT) echo "Error: can't login to sftp host" | $send_mail -s "$subj" $email;;
+            $E_FTP) echo "Error: can't create temp folder on the sftp host" | $send_mail -s "$subj" $email;;
+        esac
+        sed -i "/ $user /d" $VESTA/data/queue/backup.pipe
+        log_event "$rc" "$EVENT"
+        exit "$rc"
+    fi
+    echo -e "$(date "+%F %T") Connection established"
+    
+    # Checking retention
+    echo -e "$(date "+%F %T") Checking retention ..."
+    backup_list=$(sftpc "cd $BPATH" "ls -l" |awk '{print $9}' |grep "^$user\.")
+    backups_count=$(echo "$backup_list" | wc -l)
+    if [ "$backups_count" -ge "$BACKUPS" ]; then
+        backups_rm_number=$((backups_count - BACKUPS + 1))
+        for backup in $(echo "$backup_list" | head -n $backups_rm_number); do 
+            backup_date=$(echo $backup | sed -e "s/$user.//" -e "s/.tar.*$//")
+            if [ -z $deprecated ]; then deprecated="$backup_date"; else deprecated="$deprecated $backup_date"; fi
+            echo -e "$(date "+%F %T") Roated sftp backup: $backup_date"
+            msg="$msg\n$(date "+%F %T") Roated sftp backup: $backup_date"
+            sftpc "cd $BPATH" "rm $backup" > /dev/null 2>&1
+        done
+    fi
+
+    # Uploading backup archive
+    echo -e "$(date "+%F %T") Uploading $user.$DATE.tar ..."
+    if [ "$localbackup" = 'yes' ]; then
+        cd $BACKUP
+        sftpc "cd $BPATH" "put $user.$DATE.tar" > /dev/null 2>&1
+    else
+        cd $tmpdir
+        tar -cf $BACKUP/$user.$DATE.tar .
+        cd $BACKUP/
+        sftpc "cd $BPATH" "put $user.$DATE.tar" > /dev/null 2>&1
+        rm -f $user.$DATE.tar
+    fi
+    echo -e "$(date "+%F %T") Upload complete"
+}
+
 echo "-- SUMMARY --"
 msg="$msg\n-- SUMMARY --"
 
@@ -700,6 +852,7 @@ for backup_type in $(echo -e "${BACKUP_SYSTEM//,/\\n}"); do
     case $backup_type in
         local) local_backup ;;
         ftp)   ftp_backup ;;
+        sftp)  sftp_backup ;;
     esac
 done