Punishments for breaking vinaya rules Are there any punishments if a monk breaks vinaya rule on purpose..? ,if there is punishment ,then who would administer that punishment..?.How does buddhism deal with vinaya rule breakers..?
In theory the Pāṭimokkha Rules: Intro | Bhikkhus' | Bhikkhunis' is the basic code of monastic discipline, consisting of 227 rules for monks (bhikkhus) and 311 for nuns. It lays down offences and punishments leading to a maximum of expulsion from the order. The punishment is typically decided by the Sangha, but the presiding abbot may decide on occasion when it is not feasible to assemble the sangha.

http://www.wisdomlib.org/buddhism/book/buddhist-monastic-discipline/d/doc4046.html


  The code of the Pātimokkha itself, in its details of disciplinary
  procedure, recommends certain forms of penalties for the categories of
  major offences. The Pārājika, being the gravest of the monastic
  offences, admits of no remedies or atonements. The penalty for
  Pārājika offences being complete ex-communication and loss of monastic
  status, it is spontaneously brought about by the commission of the
  crime.
  
  All offences other than the Prājika are remediable in that every
  offender, barring one who is guilty of a Pārājika offence, who submits
  himself to the specified penalties and punishments and behaves himself
  in accordance with the law is considered as being purged of his guilt.
  The Saṇghādisesas include a host of offences for which specified
  penalties are to be imposed by the Saṇgha, taking into consideration
  the circumstances attendant on the commission of the crime.


In practice, it appears to vary depending on the monastery/monastic order, the country and the culture - barring the grave offences, there appears to be a lot of leeway in how the offences are viewed. 

Some countries like Thailand have in the past got involved in the disciplining of monks because the monastic order itself wasn't doing enough, or because the state was outraged by certain infamous incidents. 

While it appears that punishments are generally very rare in most Buddhist countries, Japanese Zen monasteries are famous for offering very tough disciplinary punishments for the smallest of offences, often decided solely by the abbot. So obviously culture has a large role to play in all this.

A strict reading of the Pāṭimokkha would make cooking an offence worthy of confession. However, monks have to adapt to new cultures and times - for example the monks and nuns of the Plum Village order in France under the tradition of Ven. Thich Nhat Hanh do their own cooking and even cook for lay people  because it is nearly impossible to go on alms rounds in the countryside where they live. 

The Buddha was rather pragmatic about the rules it would appear,


  AN 3.83: Vajjiputta Sutta — The Vajjian Monk {A i 230; Thai 3.85} [Thanissaro]. A monk who is having difficulty following all the Pāṭimokkha training rules can boil them all down to these three: the training in heightened virtue, the training in heightened mind, the training in heightened discernment.