kevent.py   [plain text]

from xnu import *

def IterateProcKqueues(proc):
    """ Iterate through all kqueues in the given process

        params:
            proc - the proc object
        returns: nothing, this is meant to be used as a generator function
            kq - yields each kqueue in the process
    """
    for kqf in IterateProcKqfiles(proc):
        yield kern.GetValueFromAddress(int(kqf), 'struct kqueue *')
    if int(proc.p_fd.fd_wqkqueue) != 0:
        yield kern.GetValueFromAddress(int(proc.p_fd.fd_wqkqueue), 'struct kqueue *')
    for kqwl in IterateProcKqworkloops(proc):
        yield kern.GetValueFromAddress(int(kqwl), 'struct kqueue *')

def IterateProcKqfiles(proc):
    """ Iterate through all kqfiles in the given process

        params:
            proc - the proc object
        returns: nothing, this is meant to be used as a generator function
            kqf - yields each kqfile in the process
    """
    filetype_KQUEUE = 5

    proc_filedesc = proc.p_fd
    proc_lastfile = unsigned(proc_filedesc.fd_lastfile)
    proc_ofiles = proc_filedesc.fd_ofiles
    queues = list()
    count = 0

    if unsigned(proc_ofiles) == 0:
        return

    while count <= proc_lastfile:
        if unsigned(proc_ofiles[count]) != 0:
            proc_fd_flags = proc_ofiles[count].f_flags
            proc_fd_fglob = proc_ofiles[count].f_fglob
            proc_fd_ftype = unsigned(proc_fd_fglob.fg_ops.fo_type)
            if proc_fd_ftype == xnudefines.DTYPE_KQUEUE:
                yield kern.GetValueFromAddress(int(proc_fd_fglob.fg_data), 'struct kqfile *')
        count += 1

def IterateProcKqworkloops(proc):
    """ Iterate through all kqworkloops in the given process

        params:
            proc - the proc object
        returns: nothing, this is meant to be used as a generator function
            kqwl - yields each kqworkloop in the process
    """
    proc_filedesc = proc.p_fd
    if int(proc_filedesc.fd_kqhash) == 0:
        return

    hash_mask = proc_filedesc.fd_kqhashmask
    for i in xrange(hash_mask + 1):
        for kqwl in IterateListEntry(proc_filedesc.fd_kqhash[i], 'struct kqworkloop *', 'kqwl_hashlink', list_prefix='s'):
            yield kqwl

def IterateAllKqueues():
    """ Iterate through all kqueues in the system

        returns: nothing, this is meant to be used as a generator function
            kq - yields each kqueue in the system
    """
    for t in kern.tasks:
        if unsigned(t.bsd_info) == 0:
            continue
        proc = kern.GetValueFromAddress(t.bsd_info, 'proc_t')
        for kq in IterateProcKqueues(proc):
            yield kq

def IterateProcKnotes(proc):
    """ Iterate through all knotes in the given process

        params:
            proc - the proc object
        returns: nothing, this is meant to be used as a generator function
            kn - yields each knote in the process
    """
    proc_filedesc = proc.p_fd

    if int(proc.p_fd.fd_knlist) != 0:
        for i in xrange(proc.p_fd.fd_knlistsize):
            for kn in IterateListEntry(proc.p_fd.fd_knlist[i], 'struct knote *', 'kn_link', list_prefix='s'):
                yield kn
    if int(proc.p_fd.fd_knhash) != 0:
        for i in xrange(proc.p_fd.fd_knhashmask + 1):
            for kn in IterateListEntry(proc.p_fd.fd_knhash[i], 'struct knote *', 'kn_link', list_prefix='s'):
                yield kn

def GetKnoteKqueue(kn):
    """ Get the kqueue corresponding to a given knote

        params:
            kn - the knote object
        returns: kq - the kqueue corresponding to the knote
    """
    return kern.GetValueFromAddress(kn.kn_kq_packed + kern.VM_MIN_KERNEL_AND_KEXT_ADDRESS, 'struct kqueue *')

@lldb_type_summary(['knote *'])
@header('{:<20s} {:<20s} {:<10s} {:<20s} {:<20s} {:<30s} {:<10} {:<10} {:<10} {:<30s}'.format('knote', 'ident', 'kev_flags', 'kqueue', 'udata', 'filtops', 'qos_use', 'qos_req', 'qos_ovr', 'status'))
def GetKnoteSummary(kn):
    """ Summarizes a knote and related information

        returns: str - summary of knote
    """
    format_string = '{o: <#020x} {o.kn_kevent.ident: <#020x} {o.kn_kevent.flags: <#010x} {kq_ptr: <#020x} {o.kn_kevent.udata: <#020x} {ops_str: <30s} {qos_use: <10s} {qos_req: <10s} {qos_ovr: <10s} {st_str: <30s}'
    state = unsigned(kn.kn_status)
    fops_str = kern.Symbolicate(kern.globals.sysfilt_ops[unsigned(kn.kn_filtid)])
    return format_string.format(
            o=kn,
            qos_use=xnudefines.thread_qos_short_strings[int(kn.kn_qos_index)],
            qos_req=xnudefines.thread_qos_short_strings[int(kn.kn_req_index)],
            qos_ovr=xnudefines.thread_qos_short_strings[int(kn.kn_qos_override)],
            st_str=xnudefines.GetStateString(xnudefines.kn_state_strings, state),
            kq_ptr=int(GetKnoteKqueue(kn)),
            ops_str=fops_str)

@lldb_command('showknote')
def ShowKnote(cmd_args=None):
    """ Show information about a knote

        usage: showknote <struct knote *>
    """
    if not cmd_args:
        raise ArgumentError('missing struct knote * argument')

    kn = kern.GetValueFromAddress(cmd_args[0], 'struct knote *')
    print GetKnoteSummary.header
    print GetKnoteSummary(kn)

def IterateKqueueKnotes(kq):
    """ Iterate through all knotes of a given kqueue

        params:
            kq - the kqueue to iterate the knotes of
        returns: nothing, this is meant to be used as a generator function
            kn - yields each knote in the kqueue
    """
    proc = kq.kq_p
    for kn in IterateProcKnotes(proc):
        if unsigned(GetKnoteKqueue(kn)) != unsigned(addressof(kq)):
            continue
        yield kn

@lldb_type_summary(['struct kqrequest *'])
@header('{:<20s} {:<20s} {:<5s} {:<5s} {:<5s} {:<5s} {:s}'.format('kqrequest', 'thread', 'qos', 'ovr_qos', 'w_qos', 'sa_qos', 'state'))
def GetKqrequestSummary(kqr):
    """ Summarize kqrequest information

        params:
            kqr - the kqrequest object
        returns: str - summary of kqrequest
    """
    fmt = '{kqrp: <#020x} {kqr.kqr_bound.kqrb_thread: <#020x} {qos: <5s} {ovr_qos: <5s} {w_qos: <5s} {sa_qos: <5s} {state_str:<s}'
    return fmt.format(kqrp=int(kqr),
            kqr=kqr,
            qos=xnudefines.thread_qos_short_strings[int(kqr.kqr_qos_index)],
            ovr_qos=xnudefines.thread_qos_short_strings[int(kqr.kqr_override_index)],
            w_qos=xnudefines.thread_qos_short_strings[int(kqr.kqr_dsync_waiters_qos)],
            sa_qos=xnudefines.thread_qos_short_strings[int(kqr.kqr_stayactive_qos)],
            state_str=xnudefines.GetStateString(xnudefines.kqrequest_state_strings, kqr.kqr_state))

@lldb_command('showkqrequest')
def ShowKqrequest(cmd_args=None):
    """ Display information about a kqrequest object.

        usage: showkqrequest <struct kqrequest *>
    """
    if len(cmd_args) < 1:
        raise ArgumentError('missing struct kqrequest * argument')
    kqr = kern.GetValueFromAddress(cmd_args[0], 'struct kqrequest *')
    print GetKqrequestSummary.header
    print GetKqrequestSummary(kqr)
    print GetKnoteSummary.header
    for kn in IterateTAILQ_HEAD(kqr.kqr_suppressed, 'kn_tqe'):
        print GetKnoteSummary(kn)

kqueue_summary_fmt = '{ptr: <#020x} {o.kq_p: <#020x} {dyn_id: <#020x} {servicer: <#20x} {owner: <#20x} {o.kq_count: <6d} {wqs: <#020x} {kqr_state: <30s} {st_str: <10s}'

@lldb_type_summary(['struct kqueue *'])
@header('{: <20s} {: <20s} {: <20s} {: <20s} {: <20s} {: <6s} {: <20s} {: <30s} {: <10s}'.format('kqueue', 'process', 'dynamic_id', 'servicer', 'owner', '#evts', 'wqs', 'request', 'state'))
def GetKqueueSummary(kq):
    """ Summarize kqueue information

        params:
            kq - the kqueue object
        returns: str - summary of kqueue
    """
    if kq.kq_state & xnudefines.KQ_WORKLOOP:
        return GetKqworkloopSummary(kern.GetValueFromAddress(int(kq), 'struct kqworkloop *'))
    elif kq.kq_state & xnudefines.KQ_WORKQ:
        return GetKqworkqSummary(kern.GetValueFromAddress(int(kq), 'struct kqworkq *'))
    else:
        return GetKqfileSummary(kern.GetValueFromAddress(int(kq), 'struct kqfile *'))

@lldb_type_summary(['struct kqfile *'])
@header(GetKqueueSummary.header)
def GetKqfileSummary(kqf):
    kq = kern.GetValueFromAddress(int(kqf), 'struct kqueue *')
    state = int(kq.kq_state)
    return kqueue_summary_fmt.format(
            o=kq,
            ptr=int(kq),
            wqs=int(kq.kq_wqs),
            kqr_state='',
            dyn_id=0,
            st_str=xnudefines.GetStateString(xnudefines.kq_state_strings, state),
            servicer=0,
            owner=0)

@lldb_command('showkqfile')
def ShowKqfile(cmd_args=None):
    """ Display information about a kqfile object.

        usage: showkqfile <struct kqfile *>
    """
    if len(cmd_args) < 1:
        raise ArgumentError('missing struct kqfile * argument')

    kqf = kern.GetValueFromAddress(cmd_args[0], 'kqfile *')

    print GetKqfileSummary.header
    print GetKqfileSummary(kqf)
    print GetKnoteSummary.header
    for kn in IterateKqueueKnotes(kqf.kqf_kqueue):
        print GetKnoteSummary(kn)
    for kn in IterateTAILQ_HEAD(kqf.kqf_suppressed, 'kn_tqe'):
        print GetKnoteSummary(kn)

@lldb_type_summary(['struct kqworkq *'])
@header(GetKqueueSummary.header)
def GetKqworkqSummary(kqwq):
    """ Summarize workqueue kqueue information

        params:
            kqwq - the kqworkq object
        returns: str - summary of workqueue kqueue
    """
    return GetKqfileSummary(kern.GetValueFromAddress(int(kqwq), 'struct kqfile *'))

@lldb_command('showkqworkq')
def ShowKqworkq(cmd_args=None):
    """ Display summary and knote information about a kqworkq.

        usage: showkqworkq <struct kqworkq *>
    """
    if len(cmd_args) < 1:
        raise ArgumentError('missing struct kqworkq * argument')

    kqwq = kern.GetValueFromAddress(cmd_args[0], 'struct kqworkq *')
    kq = kqwq.kqwq_kqueue
    print GetKqueueSummary.header
    print GetKqworkqSummary(kqwq)
    print GetKnoteSummary.header
    for kn in IterateKqueueKnotes(kq):
        print GetKnoteSummary(kn)
    for i in xrange(0, xnudefines.KQWQ_NBUCKETS):
        for kn in IterateTAILQ_HEAD(kq.kq_queue[i], 'kn_tqe'):
            print GetKnoteSummary(kn)

@lldb_type_summary(['struct kqworkloop *'])
@header(GetKqueueSummary.header)
def GetKqworkloopSummary(kqwl):
    """ Summarize workloop kqueue information

        params:
            kqwl - the kqworkloop object
        returns: str - summary of workloop kqueue
    """
    state = int(kqwl.kqwl_kqueue.kq_state)
    return kqueue_summary_fmt.format(
            ptr=int(kqwl),
            o=kqwl.kqwl_kqueue,
            wqs=int(kqwl.kqwl_kqueue.kq_wqs),
            dyn_id=kqwl.kqwl_dynamicid,
            kqr_state=xnudefines.GetStateString(xnudefines.kqrequest_state_strings, kqwl.kqwl_request.kqr_state),
            st_str=xnudefines.GetStateString(xnudefines.kq_state_strings, state),
            servicer=int(kqwl.kqwl_request.kqr_bound.kqrb_thread),
            owner=int(kqwl.kqwl_owner)
            )

@lldb_command('showkqworkloop')
def ShowKqworkloop(cmd_args=None):
    """ Display information about a kqworkloop.

        usage: showkqworkloop <struct kqworkloop *>
    """
    if len(cmd_args) < 1:
        raise ArgumentError('missing struct kqworkloop * argument')

    kqwl = kern.GetValueFromAddress(cmd_args[0], 'struct kqworkloop *')

    print GetKqworkloopSummary.header
    print GetKqworkloopSummary(kqwl)

    print GetKqrequestSummary.header
    kqr = kern.GetValueFromAddress(unsigned(addressof(kqwl.kqwl_request)), 'struct kqrequest *')
    print GetKqrequestSummary(kqr)

    print GetKnoteSummary.header
    for kn in IterateKqueueKnotes(kqwl.kqwl_kqueue):
        print GetKnoteSummary(kn)

@lldb_command('showkqueue')
def ShowKqueue(cmd_args=None):
    """ Given a struct kqueue pointer, display the summary of the kqueue

        usage: showkqueue <struct kqueue *>
    """
    if not cmd_args:
        raise ArgumentError('missing struct kqueue * argument')

    kq = kern.GetValueFromAddress(cmd_args[0], 'struct kqueue *')
    if int(kq.kq_state) & xnudefines.KQ_WORKQ:
        ShowKqworkq(cmd_args=[str(int(kq))])
    elif int(kq.kq_state) & xnudefines.KQ_WORKLOOP:
        ShowKqworkloop(cmd_args=[str(int(kq))])
    else:
        print GetKqueueSummary.header
        print GetKqueueSummary(kq)
        print GetKnoteSummary.header
        for kn in IterateKqueueKnotes(kq):
            print GetKnoteSummary(kn)

@lldb_command('showprocworkqkqueue')
def ShowProcWorkqKqueue(cmd_args=None):
    """ Show the workqueue kqueue for a given process.

        usage: showworkqkqueue <proc_t>
    """
    if not cmd_args:
        raise ArgumentError('missing struct proc * argument')

    proc = kern.GetValueFromAddress(cmd_args[0], 'proc_t')
    ShowKqworkq(cmd_args=[str(int(proc.p_fd.fd_wqkqueue))])

@lldb_command('showprockqueues')
def ShowProcKqueues(cmd_args=None):
    """ Show the kqueues for a given process.

        usage: showprockqueues <proc_t>
    """
    if not cmd_args:
        raise ArgumentError('missing struct proc * argument')

    proc = kern.GetValueFromAddress(cmd_args[0], 'proc_t')

    print GetKqueueSummary.header
    for kq in IterateProcKqueues(proc):
        print GetKqueueSummary(kq)

@lldb_command('showprocknotes')
def ShowProcKnotes(cmd_args=None):
    """ Show the knotes for a given process.

        usage: showprocknotes <proc_t>
    """

    if not cmd_args:
        raise ArgumentError('missing struct proc * argument')

    proc = kern.GetValueFromAddress(cmd_args[0], 'proc_t')

    print GetKnoteSummary.header
    for kn in IterateProcKnotes(proc):
        print GetKnoteSummary(kn)

@lldb_command('showallkqueues')
def ShowAllKqueues(cmd_args=[], cmd_options={}):
    """ Display a summary of all the kqueues in the system

        usage: showallkqueues
    """
    print GetKqueueSummary.header
    for kq in IterateAllKqueues():
        print GetKqueueSummary(kq)