Manual:API

This document describes the operation of MikroTik RouterOS API for RouterOS3. The API (application programming interface) is a way to create your own versions of Winbox. This guide will help you make simplified, or translated control applications for RouterOS v3.

Enabling and Connecting

• Default API port is 8728. By default API is disabled
• Enable API

/ip service enable api

• Now you can initiate TCP connection to the API port of the router

Protocol

• Protocol stream is formatted as a sequence of words.
• Each word is encoded as length, followed by that many bytes of content.
• Words are grouped into sentences. End of sentence is terminated by zero length word.
• Length is encoded as follows:

Value of length	Number of bytes	Encoding
0 <= len <= 0x7F	1	len, lowest byte
0x80 <= len <= 0x3FFF	2	len | 0x8000, two lower bytes
0x4000 <= len <= 0x1FFFFF	3	len | 0xC00000, three lower bytes
0x200000 <= len <= 0xFFFFFFF	4	len | 0xE0000000
len >= 0x10000000	5	0xF0 and len as four bytes

• Although this scheme allows encoding of length up to 0x7FFFFFFFF, only four byte length is supported.
• Bytes of len are sent most significant first (network order).
• If first byte of word is >= 0xF8, then it is a reserved control byte. After receiving unknown control byte API client cannot proceed, because it cannot know how to interpret following bytes.
• Currently control bytes are not used.

Short description of API sentences

• Empty sentences are ignored.
• Sentences are processed after receiving terminating zero length word.
• There is a limit on number and size of sentences client can send before it has logged in.
• Commands
  • First word is name of command. Examples:

 /login
 /ip/address/getall
 /user/active/listen
 /interface/vlan/remove
 /system/reboot

• • Names of commands closely follow console, with spaces replaced by '/'. There are commands that are specific to API, like getall or login.
  • Name of command should begin with '/'.
  • Next, command arguments can be specified. Examples:

=address=10.0.0.1
=name=iu=c3Eeg
=disable-running-check=yes

• • Command argument should begin with '=' followed by name of argument, followed by another '=', followed by value of argument.
  • There are API specific arguments, such as .id. Names of API specific arguments begin with dot.
  • Argument value can be empty and can contain '='.
  • Command sentence can have parameters that are specific to and processed by API protocol. These parameters should begin with '.' followed by name of parameter, followed by '=', followed by value of parameter.
  • Currently the only such parameter is 'tag'.
  • Order of arguments and API parameters is not important and cannot be relied on
  • First word of reply begins with '!'.
  • Each command generates at least one reply (if connection does not get terminated).
  • Last reply for every command is reply that has first word !done.
  • Errors and exceptional conditions begin with !trap.
  • Data replies begin with !re

Initial login

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• First, clients sends /login command.
• Note that each command and response ends with an empty word.
• Reply contains =ret=challenge argument.
• Client sends second /login command, with =name=username and =response=response.
• In case of error, reply contains =ret=error message.
• In case of successful login client can start to issue commands.

Tags

• It is possible to run several commands simultaneously, without waiting for previous one to complete. If API client is doing this and needs to differentiate command responses, it can use 'tag' API parameter in command sentences.
• If you include 'tag' parameter with non-empty value in command sentence, then 'tag' parameter with exactly the same value will be included in all responses generated by this command.
• If you do not include 'tag' parameter or it's value is empty, then all responses for this command will not have 'tag' parameter.

Command description

• /cancel
  • optional argument: =tag=tag of command to cancel, without it cancels all running commands
  • does not cancel itself
  • all canceled commands are interruped and in the usual case generate '!trap' and '!done' responses
  • please note that /cancel is separate command and can have it's own unique '.tag' parameter, that is not related to '=tag' argument of this command

• listen
  • listen command is avaliable where console print command is available, but it does not have expected effect everywhere (i.e. may not work)
  • !re sentences are generated as something changes in particular item list
  • when item is deleted or dissapears in any other way, the '!re' sentence includes value '=.dead=yes'
  • This command does not terminate. To terminate it use /cancel command.

• getall
  • getall command is available where console print command is available. Since version 3.21 getall is an alias for print.
  • replies contain =.id=Item internal number property.

• print
  • API print command differs from the console counterpart in the following ways:
    • arguments that modify list of returned properties (detail, breif, ...) have no effect in the API.
    • where argument is not supported. Items can be filtered using query words (see below).
    • .proplist argument is a comma separated list of property names that should be included for the returned items.
      • returned items may have additional properties.
      • order of returned properties is not defined.
      • if list contains duplicate entries, handling of such entries is not defined.
      • if propery is present in .proplist, but absent from the item, then that item does not have this property value (?name will evaluate to false for that item).
      • if .proplist is absent, all possible properties are included, even those that have slow access time (such as file contents and perfomance counters).

Queries

print command accepts query words that limit set of returned items. This feature appeared in the 3.21 version.

• Query words begin with '?'

?name	succeeds for items that have value of property name
?-name	succeeds for items that do not have value of property name
?name=x ?=name=x	succeeds for items that have value of property name equal to x
?<name=x	succeeds for items that have value of property name less than x
?>name=x	succeeds for items that have value of property name greater than x
?#rule	specifies result transformation rule. By default no transformation is done. Does not produce result.

For every item that is considered by print command, query is evaluated, and item is reported only when result of the evaluation is succesful. Each query word except '?#' produces either 'true' value (on success) or 'false' value. Query is succesful if there are no results with value 'false'.

• Transformation rule is evaluated left to right.
• During evaluation, current list of result values is numbered from last to first, starting from 0.
• Sequence of decimal digits followed by any other character or end of word is interpreted as an index of return value.
• index that is followed by a character adds value at that index as the last value (new index 0)
• index that is followed by the end of word replaces all values with the value at that index.
• '!' character replaces last value with the opposite
• '&' replaces two last values with 'true' if both of them are 'true', and with 'false' otherwise
• '|' replaces two last values with 'false' if both of them are 'false', and with 'true' otherwise
• '.' after index does nothing
• '.' after another character duplicates the last value

Command examples

/system/package/getall

Template:Bapi Template:Apic Template:Apic Template:Apis Template:Apis Template:Apis Template:Apis Template:Apis Template:Apis Template:Apis Template:Apis Template:Apis Template:Apis Template:Apis Template:Apis Template:Apis Template:Apis Template:Apis Template:Apis |- | ... more !re sentences ... |- Template:Apis Template:Apis Template:Apis Template:Apis Template:Apis Template:Apis Template:Apis Template:Apis Template:Apis Template:Apis Template:Eapi

/user/active/listen

Template:Bapi Template:Apic Template:Apic Template:Apis Template:Apis Template:Apis Template:Apis Template:Apis Template:Apis Template:Apis Template:Apis Template:Apis Template:Apis Template:Apis Template:Apis |- | ... more !re sentences ... |- Template:Eapi

Example client

• this is simple API client in Python
• usage: api.py ip-address username password
• after that type words from keyboard, terminating them with newline
• Since empty word terminates sentence, you should press enter twice after last word before sentence will be sent to router.

#!/usr/bin/python

import sys, posix, time, md5, binascii, socket, select

class ApiRos:
    "Routeros api"
    def __init__(self, sk):
        self.sk = sk
        self.currenttag = 0
        
    def login(self, username, pwd):
        for repl, attrs in self.talk(["/login"]):
            chal = binascii.unhexlify(attrs['=ret'])
        md = md5.new()
        md.update('\x00')
        md.update(pwd)
        md.update(chal)
        self.talk(["/login", "=name=" + username,
                   "=response=00" + binascii.hexlify(md.digest())])

    def talk(self, words):
        if self.writeSentence(words) == 0: return
        r = []
        while 1:
            i = self.readSentence();
            if len(i) == 0: continue
            reply = i[0]
            attrs = {}
            for w in i[1:]:
                j = w.find('=', 1)
                if (j == -1):
                    attrs[w] = ''
                else:
                    attrs[w[:j]] = w[j+1:]
            r.append((reply, attrs))
            if reply == '!done': return r

    def writeSentence(self, words):
        ret = 0
        for w in words:
            self.writeWord(w)
            ret += 1
        self.writeWord('')
        return ret

    def readSentence(self):
        r = []
        while 1:
            w = self.readWord()
            if w == '': return r
            r.append(w)
            
    def writeWord(self, w):
        print "<<< " + w
        self.writeLen(len(w))
        self.writeStr(w)

    def readWord(self):
        ret = self.readStr(self.readLen())
        print ">>> " + ret
        return ret

    def writeLen(self, l):
        if l < 0x80:
            self.writeStr(chr(l))
        elif l < 0x4000:
            l |= 0x8000
            self.writeStr(chr((l >> 8) & 0xFF))
            self.writeStr(chr(l & 0xFF))
        elif l < 0x200000:
            l |= 0xC00000
            self.writeStr(chr((l >> 16) & 0xFF))
            self.writeStr(chr((l >> 8) & 0xFF))
            self.writeStr(chr(l & 0xFF))
        elif l < 0x10000000:        
            l |= 0xE0000000         
            self.writeStr(chr((l >> 24) & 0xFF))
            self.writeStr(chr((l >> 16) & 0xFF))
            self.writeStr(chr((l >> 8) & 0xFF))
            self.writeStr(chr(l & 0xFF))
        else:                       
            self.writeStr(chr(0xF0))
            self.writeStr(chr((l >> 24) & 0xFF))
            self.writeStr(chr((l >> 16) & 0xFF))
            self.writeStr(chr((l >> 8) & 0xFF))
            self.writeStr(chr(l & 0xFF))

    def readLen(self):              
        c = ord(self.readStr(1))    
        if (c & 0x80) == 0x00:      
            pass                    
        elif (c & 0xC0) == 0x80:    
            c &= ~0xC0              
            c <<= 8                 
            c += ord(self.readStr(1))    
        elif (c & 0xE0) == 0xC0:    
            c &= ~0xE0              
            c <<= 8                 
            c += ord(self.readStr(1))    
            c <<= 8                 
            c += ord(self.readStr(1))    
        elif (c & 0xF0) == 0xE0:    
            c &= ~0xF0              
            c <<= 8                 
            c += ord(self.readStr(1))    
            c <<= 8                 
            c += ord(self.readStr(1))    
            c <<= 8                 
            c += ord(self.readStr(1))    
        elif (c & 0xF8) == 0xF0:    
            c = ord(self.readStr(1))     
            c <<= 8                 
            c += ord(self.readStr(1))    
            c <<= 8                 
            c += ord(self.readStr(1))    
            c <<= 8                 
            c += ord(self.readStr(1))    
        return c                    

    def writeStr(self, str):        
        n = 0;                      
        while n < len(str):         
            r = self.sk.send(str[n:])
            if r == 0: raise RuntimeError, "connection closed by remote end"
            n += r                  

    def readStr(self, length):      
        ret = ''                    
        while len(ret) < length:    
            s = self.sk.recv(length - len(ret))
            if s == '': raise RuntimeError, "connection closed by remote end"
            ret += s
        return ret

def main():
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    s.connect((sys.argv[1], 8728))  
    apiros = ApiRos(s);             
    apiros.login(sys.argv[2], sys.argv[3]);

    inputsentence = []

    while 1:
        r = select.select([s, sys.stdin], [], [], None)
        if s in r[0]:
            # something to read in socket, read sentence
            x = apiros.readSentence()

        if sys.stdin in r[0]:
            # read line from input and strip off newline
            l = sys.stdin.readline()
            l = l[:-1]

            # if empty line, send sentence and start with new
            # otherwise append to input sentence
            if l == '':
                apiros.writeSentence(inputsentence)
                inputsentence = []
            else:
                inputsentence.append(l)

if __name__ == '__main__':
    main()

Example run:

debian@localhost:~/api-test$ ./api.py 10.0.0.1 admin ''
<<< /login
<<< 
>>> !done
>>> =ret=93b438ec9b80057c06dd9fe67d56aa9a
>>> 
<<< /login
<<< =name=admin
<<< =response=00e134102a9d330dd7b1849fedfea3cb57
<<< 
>>> !done
>>> 
/user/getall

<<< /user/getall
<<< 
>>> !re
>>> =.id=*1
>>> =disabled=no
>>> =name=admin
>>> =group=full
>>> =address=0.0.0.0/0
>>> =netmask=0.0.0.0
>>> 
>>> !done
>>> 

Other example clients

In the Wiki

• in PHP
• in C#
• in Delphi

From the MikroTik Forum

• in Perl
• in Delphi
• in Java