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/*
* Copyright 2007, Intel Corporation
* Copyright 2009, Red Hat Inc.
*
* This file is part of Abrt.
*
* This program file is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program in a file named COPYING; if not, write to the
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA
*
* Authors:
* Anton Arapov <anton@redhat.com>
* Arjan van de Ven <arjan@linux.intel.com>
*/
#include "Kerneloops.h"
#include "KerneloopsSysLog.h"
#include "DebugDump.h"
#include "PluginSettings.h"
#include <sstream>
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <limits.h>
#include <sys/prctl.h>
#include <sys/stat.h>
#include <asm/unistd.h>
#define MAX(A,B) ((A) > (B) ? (A) : (B))
CAnalyzerKerneloops::CAnalyzerKerneloops() :
m_sSysLogFile("/var/log/messages")
{}
void CAnalyzerKerneloops::WriteSysLog(int m_nCount)
{
if (m_nCount > 0) {
openlog("abrt", 0, LOG_KERN);
syslog(LOG_WARNING, "Kerneloops: Reported %i kernel oopses to Abrt", m_nCount);
closelog();
}
}
std::string CAnalyzerKerneloops::GetLocalUUID(const std::string& pDebugDumpDir)
{
std::string m_sOops;
std::stringstream m_sHash;
CDebugDump m_pDebugDump;
m_pDebugDump.Open(pDebugDumpDir);
m_pDebugDump.LoadText(FILENAME_TEXTDATA1, m_sOops);
/* An algorithm proposed by Donald E. Knuth in The Art Of Computer
* Programming Volume 3, under the topic of sorting and search
* chapter 6.4.
*/
unsigned int m_nHash = static_cast<unsigned int>(m_sOops.length());
for(std::size_t i = 0; i < m_sOops.length(); i++)
{
m_nHash = ((m_nHash << 5) ^ (m_nHash >> 27)) ^ m_sOops[i];
}
m_sHash << (m_nHash & 0x7FFFFFFF);
return m_sHash.str();
}
std::string CAnalyzerKerneloops::GetGlobalUUID(const std::string& pDebugDumpDir)
{
return GetLocalUUID(pDebugDumpDir);
}
void CAnalyzerKerneloops::Report()
{
CDebugDump m_pDebugDump;
char m_sPath[PATH_MAX];
std::list<COops> m_pOopsList;
time_t t = time(NULL);
if (((time_t) -1) == t)
{
throw std::string("CAnalyzerKerneloops::Report(): cannot get local time.");
}
m_pOopsList = m_pSysLog.GetOopsList();
m_pSysLog.ClearOopsList();
while (!m_pOopsList.empty())
{
snprintf(m_sPath, sizeof(m_sPath), "%s/kerneloops-%d-%d", DEBUG_DUMPS_DIR, t, m_pOopsList.size());
COops m_pOops;
m_pOops = m_pOopsList.back();
try
{
m_pDebugDump.Create(m_sPath);
m_pDebugDump.SaveText(FILENAME_ANALYZER, "Kerneloops");
m_pDebugDump.SaveText(FILENAME_UID, "0");
m_pDebugDump.SaveText(FILENAME_EXECUTABLE, "kernel");
m_pDebugDump.SaveText(FILENAME_KERNEL, m_pOops.m_sVersion);
m_pDebugDump.SaveText(FILENAME_PACKAGE, "not_applicable");
m_pDebugDump.SaveText(FILENAME_TEXTDATA1, m_pOops.m_sData);
m_pDebugDump.Close();
}
catch (std::string sError)
{
throw std::string("CAnalyzerKerneloops::Report(): ") + sError.c_str();
}
m_pOopsList.pop_back();
}
}
void CAnalyzerKerneloops::Init()
{
/* daemonize */
pid_t pid = fork();
if (pid < 0)
throw std::string("CAnalyzerKerneloops::Init(): fork failed.");
/* hack: release Init() */
if (pid)
return;
sched_yield();
#ifdef PR_SET_TIMERSLACK
/*
* Signal the kernel that we're not timing critical
*/
prctl(PR_SET_TIMERSLACK,1000*1000*1000, 0, 0, 0);
#endif
/* we scan dmesg before /var/log/messages; dmesg is a more accurate source normally */
ScanDmesg();
/* during boot... don't go too fast and slow the system down */
sleep(10);
ScanSysLogFile(m_sSysLogFile.c_str(), 1);
while(1) {
sleep(10);
ScanDmesg();
}
}
void CAnalyzerKerneloops::ScanDmesg()
{
int m_nFoundOopses;
char *buffer;
buffer = (char*)calloc(getpagesize()+1, 1);
syscall(__NR_syslog, 3, buffer, getpagesize());
m_nFoundOopses = m_pSysLog.ExtractOops(buffer, strlen(buffer), 0);
free(buffer);
if (m_nFoundOopses > 0)
Report();
}
void CAnalyzerKerneloops::ScanSysLogFile(const char *filename, int issyslog)
{
char *buffer;
struct stat statb;
FILE *file;
int ret;
int m_nFoundOopses;
size_t buflen;
memset(&statb, 0, sizeof(statb));
ret = stat(filename, &statb);
if (statb.st_size < 1 || ret != 0)
return;
/*
* in theory there's a race here, since someone could spew
* to /var/log/messages before we read it in... we try to
* deal with it by reading at most 1023 bytes extra. If there's
* more than that.. any oops will be in dmesg anyway.
* Do not try to allocate an absurt amount of memory; ignore
* older log messages because they are unlikely to have
* sufficiently recent data to be useful. 32MB is more
* than enough; it's not worth looping through more log
* if the log is larger than that.
*/
buflen = MAX(statb.st_size+1024, 32*1024*1024);
buffer = (char*)calloc(buflen, 1);
assert(buffer != NULL);
file = fopen(filename, "rm");
if (!file) {
free(buffer);
return;
}
fseek(file, -buflen, SEEK_END);
ret = fread(buffer, 1, buflen-1, file);
fclose(file);
if (ret > 0)
m_nFoundOopses = m_pSysLog.ExtractOops(buffer, buflen-1, issyslog);
free(buffer);
if (m_nFoundOopses > 0) {
Report();
WriteSysLog(m_nFoundOopses);
}
}
void CAnalyzerKerneloops::LoadSettings(const std::string& pPath)
{
map_settings_t settings;
plugin_load_settings(pPath, settings);
if (settings.find("SysLogFile")!= settings.end())
{
m_sSysLogFile = settings["SysLogFile"];
}
}
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