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parsers.cpp
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/*
Copyright (C) 2021 The Falco Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
#ifdef _WIN32
#define NOMINMAX
#include <winsock2.h>
#else
#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>
#endif // _WIN32
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <limits>
#include "container_engine/mesos.h"
#include "sinsp.h"
#include "sinsp_int.h"
#include "tracers.h"
#include "parsers.h"
#include "sinsp_errno.h"
#include "filter.h"
#include "filterchecks.h"
#include "protodecoder.h"
#ifdef SIMULATE_DROP_MODE
bool should_drop(sinsp_evt *evt);
#endif
#include "sinsp_int.h"
#include "container_engine/docker.h"
extern sinsp_protodecoder_list g_decoderlist;
extern sinsp_evttables g_infotables;
sinsp_parser::sinsp_parser(sinsp *inspector) :
m_inspector(inspector),
m_tmp_evt(m_inspector),
m_fd_listener(NULL)
{
m_fake_userevt = (scap_evt*)m_fake_userevt_storage;
//
// Note: allocated here instead of in the sinsp constructor because sinsp_partial_tracer
// is not defined in sinsp.cpp
//
m_inspector->m_partial_tracers_pool = new simple_lifo_queue<sinsp_partial_tracer>(128);
init_metaevt(m_k8s_metaevents_state, PPME_K8S_E, SP_EVT_BUF_SIZE);
init_metaevt(m_mesos_metaevents_state, PPME_MESOS_E, SP_EVT_BUF_SIZE);
m_drop_event_flags = EF_NONE;
}
sinsp_parser::~sinsp_parser()
{
for(uint32_t j = 0; j < m_protodecoders.size(); j++)
{
delete m_protodecoders[j];
}
while(!m_tmp_events_buffer.empty())
{
auto ptr = m_tmp_events_buffer.top();
free(ptr);
m_tmp_events_buffer.pop();
}
m_protodecoders.clear();
free(m_k8s_metaevents_state.m_piscapevt);
free(m_mesos_metaevents_state.m_piscapevt);
if(m_inspector->m_partial_tracers_pool != NULL)
{
delete m_inspector->m_partial_tracers_pool;
}
}
void sinsp_parser::init_scapevt(metaevents_state& evt_state, uint16_t evt_type, uint16_t buf_size)
{
evt_state.m_piscapevt = (scap_evt*) realloc(evt_state.m_piscapevt, buf_size);
evt_state.m_scap_buf_size = buf_size;
evt_state.m_piscapevt->type = evt_type;
evt_state.m_metaevt.m_pevt = evt_state.m_piscapevt;
}
void sinsp_parser::init_metaevt(metaevents_state& evt_state, uint16_t evt_type, uint16_t buf_size)
{
evt_state.m_piscapevt = 0;
init_scapevt(evt_state, evt_type, buf_size);
evt_state.m_metaevt.m_inspector = m_inspector;
evt_state.m_metaevt.m_info = &(g_infotables.m_event_info[PPME_SYSDIGEVENT_X]);
evt_state.m_metaevt.m_cpuid = 0;
evt_state.m_metaevt.m_evtnum = 0;
evt_state.m_metaevt.m_fdinfo = NULL;
}
///////////////////////////////////////////////////////////////////////////////
// PROCESSING ENTRY POINT
///////////////////////////////////////////////////////////////////////////////
void sinsp_parser::process_event(sinsp_evt *evt)
{
uint16_t etype = evt->m_pevt->type;
bool is_live = m_inspector->is_live();
//
// Cleanup the event-related state
//
reset(evt);
//
// When debug mode is not enabled, filter out events about sysdig itself
//
#if defined(HAS_CAPTURE)
if(is_live && !m_inspector->is_debug_enabled())
{
if(evt->get_tid() == m_inspector->m_sysdig_pid &&
etype != PPME_SCHEDSWITCH_1_E &&
etype != PPME_SCHEDSWITCH_6_E &&
etype != PPME_DROP_E &&
etype != PPME_DROP_X &&
etype != PPME_SYSDIGEVENT_E &&
etype != PPME_PROCINFO_E &&
etype != PPME_CPU_HOTPLUG_E &&
m_inspector->m_sysdig_pid)
{
evt->m_filtered_out = true;
return;
}
}
#endif
if(m_drop_event_flags)
{
enum ppm_event_flags flags;
uint16_t etype = evt->m_pevt->type;
if(etype == PPME_GENERIC_E || etype == PPME_GENERIC_X)
{
sinsp_evt_param *parinfo = evt->get_param(0);
uint16_t evid = *(uint16_t *)parinfo->m_val;
flags = g_infotables.m_syscall_info_table[evid].flags;
}
else
{
flags = evt->get_info_flags();
}
if (flags & m_drop_event_flags)
{
evt->m_filtered_out = true;
return;
}
}
//
// Filtering
//
#if defined(HAS_FILTERING) && defined(HAS_CAPTURE_FILTERING)
bool do_filter_later = false;
if(m_inspector->m_filter || m_inspector->m_evttype_filter)
{
ppm_event_flags eflags = evt->get_info_flags();
if(etype == PPME_SYSCALL_WRITE_X)
{
//
// Check if this is a tracer
//
sinsp_fdinfo_t* fdinfo = evt->m_fdinfo;
if(fdinfo == NULL && evt->m_tinfo != nullptr)
{
fdinfo = evt->m_tinfo->get_fd(evt->m_tinfo->m_lastevent_fd);
evt->m_fdinfo = fdinfo;
}
if(fdinfo && (fdinfo->m_flags & (sinsp_fdinfo_t::FLAGS_IS_TRACER_FD | sinsp_fdinfo_t::FLAGS_IS_TRACER_FILE)))
{
eflags = (ppm_event_flags)(((uint64_t)eflags) | EF_MODIFIES_STATE);
}
else
{
if(!m_inspector->is_live())
{
if((evt->get_dump_flags() & SCAP_DF_TRACER) != 0)
{
evt->m_fdinfo = NULL;
eflags = (ppm_event_flags)(((uint64_t)eflags) | EF_MODIFIES_STATE);
}
}
}
}
if(eflags & EF_MODIFIES_STATE)
{
do_filter_later = true;
}
else
{
if(m_inspector->run_filters_on_evt(evt) == false)
{
if(evt->m_tinfo != NULL)
{
if(!(eflags & EF_SKIPPARSERESET || etype == PPME_SCHEDSWITCH_6_E))
{
evt->m_tinfo->m_lastevent_type = PPM_EVENT_MAX;
}
}
evt->m_filtered_out = true;
return;
}
}
}
evt->m_filtered_out = false;
#endif
//
// Route the event to the proper function
//
switch(etype)
{
case PPME_SOCKET_SENDTO_E:
if((evt->m_fdinfo == nullptr) && (evt->m_tinfo != nullptr))
{
infer_sendto_fdinfo(evt);
}
// FALLTHRU
case PPME_SYSCALL_OPEN_E:
case PPME_SOCKET_SOCKET_E:
case PPME_SYSCALL_EVENTFD_E:
case PPME_SYSCALL_CHDIR_E:
case PPME_SYSCALL_FCHDIR_E:
case PPME_SYSCALL_CREAT_E:
case PPME_SYSCALL_OPENAT_E:
case PPME_SOCKET_SHUTDOWN_E:
case PPME_SYSCALL_GETRLIMIT_E:
case PPME_SYSCALL_SETRLIMIT_E:
case PPME_SYSCALL_PRLIMIT_E:
case PPME_SOCKET_SENDMSG_E:
case PPME_SYSCALL_SENDFILE_E:
case PPME_SYSCALL_SETRESUID_E:
case PPME_SYSCALL_SETRESGID_E:
case PPME_SYSCALL_SETUID_E:
case PPME_SYSCALL_SETGID_E:
case PPME_SYSCALL_EXECVE_18_E:
case PPME_SYSCALL_EXECVE_19_E:
case PPME_SYSCALL_SETPGID_E:
store_event(evt);
break;
case PPME_SYSCALL_WRITE_E:
if(!m_inspector->m_is_dumping && evt->m_tinfo != nullptr)
{
evt->m_fdinfo = evt->m_tinfo->get_fd(evt->m_tinfo->m_lastevent_fd);
if(evt->m_fdinfo)
{
if(evt->m_fdinfo->m_flags & sinsp_fdinfo_t::FLAGS_IS_TRACER_FD)
{
evt->m_filtered_out = true;
return;
}
}
}
break;
case PPME_SYSCALL_READ_X:
case PPME_SYSCALL_WRITE_X:
case PPME_SOCKET_RECV_X:
case PPME_SOCKET_SEND_X:
case PPME_SOCKET_RECVFROM_X:
case PPME_SOCKET_RECVMSG_X:
case PPME_SOCKET_SENDTO_X:
case PPME_SOCKET_SENDMSG_X:
case PPME_SYSCALL_READV_X:
case PPME_SYSCALL_WRITEV_X:
case PPME_SYSCALL_PREAD_X:
case PPME_SYSCALL_PWRITE_X:
case PPME_SYSCALL_PREADV_X:
case PPME_SYSCALL_PWRITEV_X:
parse_rw_exit(evt);
break;
case PPME_SYSCALL_SENDFILE_X:
parse_sendfile_exit(evt);
break;
case PPME_SYSCALL_OPEN_X:
case PPME_SYSCALL_CREAT_X:
case PPME_SYSCALL_OPENAT_X:
case PPME_SYSCALL_OPENAT_2_X:
parse_open_openat_creat_exit(evt);
break;
case PPME_SYSCALL_SELECT_E:
case PPME_SYSCALL_POLL_E:
case PPME_SYSCALL_PPOLL_E:
case PPME_SYSCALL_EPOLLWAIT_E:
parse_select_poll_epollwait_enter(evt);
break;
case PPME_SYSCALL_CLONE_11_X:
case PPME_SYSCALL_CLONE_16_X:
case PPME_SYSCALL_CLONE_17_X:
case PPME_SYSCALL_CLONE_20_X:
case PPME_SYSCALL_FORK_X:
case PPME_SYSCALL_FORK_17_X:
case PPME_SYSCALL_FORK_20_X:
case PPME_SYSCALL_VFORK_X:
case PPME_SYSCALL_VFORK_17_X:
case PPME_SYSCALL_VFORK_20_X:
parse_clone_exit(evt);
break;
case PPME_SYSCALL_EXECVE_8_X:
case PPME_SYSCALL_EXECVE_13_X:
case PPME_SYSCALL_EXECVE_14_X:
case PPME_SYSCALL_EXECVE_15_X:
case PPME_SYSCALL_EXECVE_16_X:
case PPME_SYSCALL_EXECVE_17_X:
case PPME_SYSCALL_EXECVE_18_X:
case PPME_SYSCALL_EXECVE_19_X:
parse_execve_exit(evt);
break;
case PPME_PROCEXIT_E:
case PPME_PROCEXIT_1_E:
parse_thread_exit(evt);
break;
case PPME_SYSCALL_PIPE_X:
parse_pipe_exit(evt);
break;
case PPME_SOCKET_SOCKET_X:
parse_socket_exit(evt);
break;
case PPME_SOCKET_BIND_X:
parse_bind_exit(evt);
break;
case PPME_SOCKET_CONNECT_E:
parse_connect_enter(evt);
break;
case PPME_SOCKET_CONNECT_X:
parse_connect_exit(evt);
break;
case PPME_SOCKET_ACCEPT_X:
case PPME_SOCKET_ACCEPT_5_X:
case PPME_SOCKET_ACCEPT4_X:
case PPME_SOCKET_ACCEPT4_5_X:
parse_accept_exit(evt);
break;
case PPME_SYSCALL_CLOSE_E:
parse_close_enter(evt);
break;
case PPME_SYSCALL_CLOSE_X:
parse_close_exit(evt);
break;
case PPME_SYSCALL_FCNTL_E:
parse_fcntl_enter(evt);
break;
case PPME_SYSCALL_FCNTL_X:
parse_fcntl_exit(evt);
break;
case PPME_SYSCALL_EVENTFD_X :
parse_eventfd_exit(evt);
break;
case PPME_SYSCALL_CHDIR_X:
parse_chdir_exit(evt);
break;
case PPME_SYSCALL_FCHDIR_X:
parse_fchdir_exit(evt);
break;
case PPME_SYSCALL_GETCWD_X:
parse_getcwd_exit(evt);
break;
case PPME_SOCKET_SHUTDOWN_X:
parse_shutdown_exit(evt);
break;
case PPME_SYSCALL_DUP_X:
parse_dup_exit(evt);
break;
case PPME_SYSCALL_SIGNALFD_X:
parse_signalfd_exit(evt);
break;
case PPME_SYSCALL_TIMERFD_CREATE_X:
parse_timerfd_create_exit(evt);
break;
case PPME_SYSCALL_INOTIFY_INIT_X:
parse_inotify_init_exit(evt);
break;
case PPME_SYSCALL_GETRLIMIT_X:
case PPME_SYSCALL_SETRLIMIT_X:
parse_getrlimit_setrlimit_exit(evt);
break;
case PPME_SYSCALL_PRLIMIT_X:
parse_prlimit_exit(evt);
break;
case PPME_SOCKET_SOCKETPAIR_X:
parse_socketpair_exit(evt);
break;
case PPME_SCHEDSWITCH_1_E:
case PPME_SCHEDSWITCH_6_E:
parse_context_switch(evt);
break;
case PPME_SYSCALL_BRK_4_X:
case PPME_SYSCALL_MMAP_X:
case PPME_SYSCALL_MMAP2_X:
case PPME_SYSCALL_MUNMAP_X:
parse_brk_munmap_mmap_exit(evt);
break;
case PPME_SYSCALL_SETRESUID_X:
parse_setresuid_exit(evt);
break;
case PPME_SYSCALL_SETRESGID_X:
parse_setresgid_exit(evt);
break;
case PPME_SYSCALL_SETUID_X:
parse_setuid_exit(evt);
break;
case PPME_SYSCALL_SETGID_X:
parse_setgid_exit(evt);
break;
case PPME_CONTAINER_E:
parse_container_evt(evt); // deprecated, only here for backwards compatibility
break;
case PPME_CONTAINER_JSON_E:
parse_container_json_evt(evt);
break;
case PPME_CPU_HOTPLUG_E:
parse_cpu_hotplug_enter(evt);
break;
#if !defined(CYGWING_AGENT) && !defined(MINIMAL_BUILD)
case PPME_K8S_E:
if(!m_inspector->is_live())
{
parse_k8s_evt(evt);
}
break;
case PPME_MESOS_E:
if(!m_inspector->is_live())
{
parse_mesos_evt(evt);
}
break;
#endif // #if !defined(CYGWING_AGENT) && !defined(MINIMAL_BUILD)
case PPME_SYSCALL_CHROOT_X:
parse_chroot_exit(evt);
break;
case PPME_SYSCALL_SETSID_X:
parse_setsid_exit(evt);
break;
case PPME_SOCKET_GETSOCKOPT_X:
if(evt->get_num_params() > 0)
{
parse_getsockopt_exit(evt);
}
break;
default:
break;
}
//
// With some state-changing events like clone, execve and open, we do the
// filtering after having updated the state
//
#if defined(HAS_FILTERING) && defined(HAS_CAPTURE_FILTERING)
if(do_filter_later)
{
if(m_inspector->run_filters_on_evt(evt) == false)
{
evt->m_filtered_out = true;
return;
}
evt->m_filtered_out = false;
}
#endif
//
// Offline captures can produce events with the SCAP_DF_STATE_ONLY. They are
// supposed to go through the engine, but they must be filtered out before
// reaching the user.
//
if(!is_live)
{
if(evt->get_dump_flags() & SCAP_DF_STATE_ONLY)
{
evt->m_filtered_out = true;
}
}
// Check to see if the name changed as a side-effect of
// parsing this event. Try to avoid the overhead of a string
// compare for every event.
if(evt->m_fdinfo)
{
evt->set_fdinfo_name_changed(evt->m_fdinfo->m_name != evt->m_fdinfo->m_oldname);
}
}
void sinsp_parser::event_cleanup(sinsp_evt *evt)
{
if(evt->get_direction() == SCAP_ED_OUT &&
evt->m_tinfo && evt->m_tinfo->m_lastevent_data)
{
free_event_buffer(evt->m_tinfo->m_lastevent_data);
evt->m_tinfo->m_lastevent_data = NULL;
evt->m_tinfo->set_lastevent_data_validity(false);
}
}
///////////////////////////////////////////////////////////////////////////////
// HELPERS
///////////////////////////////////////////////////////////////////////////////
//
// Called before starting the parsing.
// Returns false in case of issues resetting the state.
//
bool sinsp_parser::reset(sinsp_evt *evt)
{
uint16_t etype = evt->get_type();
//
// Before anything can happen, the event needs to be
// initialized.
//
// For events created by the container resolvers and pushed
// onto the inspector's pending_container_events queue, the
// event has a threadinfo pointer that points to the process
// that created the container.
//
// However, for container events that are at the beginning of
// trace files and only describe the set of current
// containers, the threadinfo pointer is junk and must be
// cleared in init(). So only keep the threadinfo for "live"
// containers.
//
if (m_inspector->is_live() && etype == PPME_CONTAINER_JSON_E && evt->m_tinfo_ref != nullptr)
{
// this is a synthetic event generated by the container manager
// the threadinfo should already be set properly
evt->init_keep_threadinfo();
return true;
}
else
{
evt->init();
}
ppm_event_flags eflags = evt->get_info_flags();
evt->m_fdinfo = NULL;
evt->m_errorcode = 0;
//
// Ignore scheduler events
//
if(eflags & EF_SKIPPARSERESET)
{
if(etype == PPME_PROCINFO_E)
{
evt->m_tinfo = &*m_inspector->get_thread_ref(evt->m_pevt->tid, false, false);
}
else
{
evt->m_tinfo = NULL;
}
return false;
}
//
// Find the thread info
//
//
// If we're exiting a clone or if we have a scheduler event
// (many kernel thread), we don't look for /proc
//
bool query_os;
if(etype == PPME_SYSCALL_CLONE_11_X ||
etype == PPME_SYSCALL_CLONE_16_X ||
etype == PPME_SYSCALL_CLONE_17_X ||
etype == PPME_SYSCALL_CLONE_20_X ||
etype == PPME_SYSCALL_FORK_X ||
etype == PPME_SYSCALL_FORK_17_X ||
etype == PPME_SYSCALL_FORK_20_X ||
etype == PPME_SYSCALL_VFORK_X ||
etype == PPME_SYSCALL_VFORK_17_X ||
etype == PPME_SYSCALL_VFORK_20_X ||
etype == PPME_SCHEDSWITCH_6_E)
{
query_os = false;
}
else
{
query_os = true;
}
if(etype == PPME_CONTAINER_JSON_E)
{
evt->m_tinfo = nullptr;
return true;
}
else
{
evt->m_tinfo = &*m_inspector->get_thread_ref(evt->m_pevt->tid, query_os, false);
}
if(etype == PPME_SCHEDSWITCH_6_E)
{
return false;
}
if(!evt->m_tinfo)
{
if(etype == PPME_SYSCALL_CLONE_11_X ||
etype == PPME_SYSCALL_CLONE_16_X ||
etype == PPME_SYSCALL_CLONE_17_X ||
etype == PPME_SYSCALL_CLONE_20_X ||
etype == PPME_SYSCALL_FORK_X ||
etype == PPME_SYSCALL_FORK_17_X ||
etype == PPME_SYSCALL_FORK_20_X ||
etype == PPME_SYSCALL_VFORK_X ||
etype == PPME_SYSCALL_VFORK_17_X ||
etype == PPME_SYSCALL_VFORK_20_X)
{
#ifdef GATHER_INTERNAL_STATS
m_inspector->m_thread_manager->m_failed_lookups->decrement();
#endif
}
else
{
ASSERT(false);
}
return false;
}
if(query_os)
{
evt->m_tinfo->m_flags |= PPM_CL_ACTIVE;
}
if(PPME_IS_ENTER(etype))
{
evt->m_tinfo->m_lastevent_fd = -1;
evt->m_tinfo->m_lastevent_type = etype;
if(eflags & EF_USES_FD)
{
sinsp_evt_param *parinfo;
//
// Get the fd.
// The fd is always the first parameter of the enter event.
//
parinfo = evt->get_param(0);
ASSERT(parinfo->m_len == sizeof(int64_t));
ASSERT(evt->get_param_info(0)->type == PT_FD);
evt->m_tinfo->m_lastevent_fd = *(int64_t *)parinfo->m_val;
evt->m_fdinfo = evt->m_tinfo->get_fd(evt->m_tinfo->m_lastevent_fd);
}
evt->m_tinfo->m_latency = 0;
evt->m_tinfo->m_last_latency_entertime = evt->get_ts();
}
else
{
sinsp_threadinfo* tinfo = evt->m_tinfo;
//
// event latency
//
if(tinfo->m_last_latency_entertime != 0)
{
tinfo->m_latency = evt->get_ts() - tinfo->m_last_latency_entertime;
ASSERT((int64_t)tinfo->m_latency >= 0);
}
if(etype == tinfo->m_lastevent_type + 1)
{
tinfo->set_lastevent_data_validity(true);
}
else
{
tinfo->set_lastevent_data_validity(false);
if(tinfo->m_lastevent_type != PPME_TRACER_E)
{
return false;
}
}
//
// Error detection logic
//
if(evt->get_num_params() != 0 &&
((evt->m_info->params[0].name[0] == 'r' &&
evt->m_info->params[0].name[1] == 'e' &&
evt->m_info->params[0].name[2] == 's' &&
evt->m_info->params[0].name[3] == '\0') ||
(evt->m_info->params[0].name[0] == 'f' &&
evt->m_info->params[0].name[1] == 'd' &&
evt->m_info->params[0].name[2] == '\0')))
{
sinsp_evt_param *parinfo;
parinfo = evt->get_param(0);
ASSERT(parinfo->m_len == sizeof(int64_t));
int64_t res = *(int64_t *)parinfo->m_val;
if(res < 0)
{
evt->m_errorcode = -(int32_t)res;
}
}
//
// Retrieve the fd
//
if(eflags & EF_USES_FD)
{
evt->m_fdinfo = tinfo->get_fd(tinfo->m_lastevent_fd);
if(evt->m_fdinfo == NULL)
{
return false;
}
if(evt->m_errorcode != 0 && m_fd_listener)
{
m_fd_listener->on_error(evt);
}
if(evt->m_fdinfo->m_flags & sinsp_fdinfo_t::FLAGS_CLOSE_CANCELED)
{
//
// A close gets canceled when the same fd is created successfully between
// close enter and close exit.
// If that happens
//
erase_fd_params eparams;
evt->m_fdinfo->m_flags &= ~sinsp_fdinfo_t::FLAGS_CLOSE_CANCELED;
eparams.m_fd = CANCELED_FD_NUMBER;
eparams.m_fdinfo = tinfo->get_fd(CANCELED_FD_NUMBER);
//
// Remove the fd from the different tables
//
eparams.m_remove_from_table = true;
eparams.m_tinfo = tinfo;
eparams.m_ts = evt->get_ts();
erase_fd(&eparams);
}
}
}
return true;
}
void sinsp_parser::store_event(sinsp_evt *evt)
{
if(!evt->m_tinfo)
{
//
// No thread in the table. We won't store this event, which mean that
// we won't be able to parse the corresponding exit event and we'll have
// to drop the information it carries.
//
#ifdef GATHER_INTERNAL_STATS
m_inspector->m_stats.m_n_store_drops++;
#endif
return;
}
uint32_t elen;
//
// Make sure the event data is going to fit
//
elen = scap_event_getlen(evt->m_pevt);
if(elen > SP_EVT_BUF_SIZE)
{
ASSERT(false);
return;
}
//
// Copy the data
//
auto tinfo = evt->m_tinfo;
if(tinfo->m_lastevent_data == NULL)
{
tinfo->m_lastevent_data = reserve_event_buffer();
}
memcpy(tinfo->m_lastevent_data, evt->m_pevt, elen);
tinfo->m_lastevent_cpuid = evt->get_cpuid();
#ifdef GATHER_INTERNAL_STATS
m_inspector->m_stats.m_n_stored_evts++;
#endif
}
bool sinsp_parser::retrieve_enter_event(sinsp_evt *enter_evt, sinsp_evt *exit_evt)
{
//
// Make sure there's a valid thread info
//
if(!exit_evt->m_tinfo)
{
return false;
}
//
// Retrieve the copy of the enter event and initialize it
//
if(!(exit_evt->m_tinfo->is_lastevent_data_valid() && exit_evt->m_tinfo->m_lastevent_data))
{
//
// This happen especially at the beginning of trace files, where events
// can be truncated
//
#ifdef GATHER_INTERNAL_STATS
m_inspector->m_stats.m_n_retrieve_drops++;
#endif
return false;
}
enter_evt->init(exit_evt->m_tinfo->m_lastevent_data, exit_evt->m_tinfo->m_lastevent_cpuid);
//
// Make sure that we're using the right enter event, to prevent inconsistencies when events
// are dropped
//
if(enter_evt->get_type() != (exit_evt->get_type() - 1))
{
//ASSERT(false);
exit_evt->m_tinfo->set_lastevent_data_validity(false);
#ifdef GATHER_INTERNAL_STATS
m_inspector->m_stats.m_n_retrieve_drops++;
#endif
return false;
}
#ifdef GATHER_INTERNAL_STATS
m_inspector->m_stats.m_n_retrieved_evts++;
#endif
return true;
}
sinsp_protodecoder* sinsp_parser::add_protodecoder(string decoder_name)
{
//
// Make sure this decoder is not present yet
//
vector<sinsp_protodecoder*>::iterator it;
for(it = m_protodecoders.begin(); it != m_protodecoders.end(); ++it)
{
if((*it)->get_name() == decoder_name)
{
return (*it);
}
}
sinsp_protodecoder* nd = g_decoderlist.new_protodecoder_from_name(decoder_name,
m_inspector);
nd->init();
m_protodecoders.push_back(nd);
return nd;
}
void sinsp_parser::register_event_callback(sinsp_pd_callback_type etype, sinsp_protodecoder* dec)
{
switch(etype)
{
case CT_OPEN:
m_open_callbacks.push_back(dec);
break;
case CT_CONNECT:
m_connect_callbacks.push_back(dec);
break;
default:
ASSERT(false);
break;
}
return;
}
///////////////////////////////////////////////////////////////////////////////
// PARSERS
///////////////////////////////////////////////////////////////////////////////
void sinsp_parser::parse_clone_exit(sinsp_evt *evt)
{
sinsp_evt_param* parinfo;
int64_t tid = evt->get_tid();
int64_t childtid;
bool is_inverted_clone = false; // true if clone() in the child returns before the one in the parent
bool tid_collision = false;
bool valid_parent = true;
bool in_container = false;
int64_t vtid = tid;
int64_t vpid = -1;
uint16_t etype = evt->get_type();
//
// Validate the return value and get the child tid
//
parinfo = evt->get_param(0);
ASSERT(parinfo->m_len == sizeof(int64_t));
childtid = *(int64_t *)parinfo->m_val;
switch(evt->get_type())
{
case PPME_SYSCALL_CLONE_11_X:
parinfo = evt->get_param(8);
break;
case PPME_SYSCALL_CLONE_16_X:
case PPME_SYSCALL_FORK_X:
case PPME_SYSCALL_VFORK_X:
parinfo = evt->get_param(13);
break;
case PPME_SYSCALL_CLONE_17_X:
case PPME_SYSCALL_FORK_17_X:
case PPME_SYSCALL_VFORK_17_X:
parinfo = evt->get_param(14);
break;
case PPME_SYSCALL_CLONE_20_X:
case PPME_SYSCALL_FORK_20_X:
case PPME_SYSCALL_VFORK_20_X:
parinfo = evt->get_param(15);
break;
default:
ASSERT(false);
}
ASSERT(parinfo->m_len == sizeof(int32_t));
uint32_t flags = *(int32_t *)parinfo->m_val;
if(childtid < 0)
{
//
// clone() failed. Do nothing and keep going.
//
return;
}
//
// Get the vtid to check if the clone is within a container
//
switch(etype)
{
case PPME_SYSCALL_CLONE_11_X:
case PPME_SYSCALL_CLONE_16_X:
case PPME_SYSCALL_CLONE_17_X:
case PPME_SYSCALL_FORK_X:
case PPME_SYSCALL_FORK_17_X:
case PPME_SYSCALL_VFORK_X:
case PPME_SYSCALL_VFORK_17_X:
break;
case PPME_SYSCALL_CLONE_20_X:
case PPME_SYSCALL_FORK_20_X:
case PPME_SYSCALL_VFORK_20_X:
parinfo = evt->get_param(18);
ASSERT(parinfo->m_len == sizeof(int64_t));
vtid = *(int64_t *)parinfo->m_val;
parinfo = evt->get_param(19);
ASSERT(parinfo->m_len == sizeof(int64_t));
vpid = *(int64_t *)parinfo->m_val;
break;
default:
ASSERT(false);
}
// the flag check should always suffice but leave the tid/vtid check for older driver versions
if(flags & PPM_CL_CHILD_IN_PIDNS || tid != vtid)
{
in_container = true;
}
if(childtid == 0)
{
//
// clone() returns 0 in the child.
//