1178 lines
38 KiB
C++
1178 lines
38 KiB
C++
#include "auth.h"
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#include "bitfields.h"
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#include "defines.h"
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#include "procs.h"
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#include "shared_memory.h"
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#include "stream.h"
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#include "timing.h"
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#include <cerrno>
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#include <cstdio>
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#include <cstdlib>
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#include <cstring>
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#include <fcntl.h>
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#include <iostream>
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#include <sys/mman.h>
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#include <sys/sem.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#if defined(__CYGWIN__) || defined(_WIN32)
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#include <accctrl.h>
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#include <aclapi.h>
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#include <windows.h>
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#endif
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/// Forces a disconnect to all users.
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static void killStatistics(char *data, size_t len, unsigned int id){
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(*(data - 1)) = 60 | ((*(data - 1)) & 0x80); // Send disconnect message;
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}
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namespace IPC{
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#if defined(__CYGWIN__) || defined(_WIN32)
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static std::map<std::string, sharedPage> preservedPages;
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void preservePage(std::string p){preservedPages[p].init(p, 0, false, false);}
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void releasePage(std::string p){preservedPages.erase(p);}
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#endif
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///\brief Empty semaphore constructor, clears all values
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semaphore::semaphore(){
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#if defined(__CYGWIN__) || defined(_WIN32)
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mySem = 0;
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#else
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mySem = SEM_FAILED;
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#endif
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isLocked = 0;
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}
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///\brief Constructs a named semaphore
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///\param name The name of the semaphore
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///\param oflag The flags with which to open the semaphore
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///\param mode The mode in which to create the semaphore, if O_CREAT is given in oflag, ignored otherwise
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///\param value The initial value of the semaphore if O_CREAT is given in oflag, ignored otherwise
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semaphore::semaphore(const char *name, int oflag, mode_t mode, unsigned int value, bool noWait){
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#if defined(__CYGWIN__) || defined(_WIN32)
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mySem = 0;
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#else
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mySem = SEM_FAILED;
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#endif
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isLocked = 0;
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open(name, oflag, mode, value, noWait);
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}
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///\brief The deconstructor
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semaphore::~semaphore(){close();}
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///\brief Returns whether we have a valid semaphore
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semaphore::operator bool() const{
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#if defined(__CYGWIN__) || defined(_WIN32)
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return mySem != 0;
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#else
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return mySem != SEM_FAILED;
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#endif
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}
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///\brief Opens a semaphore
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///
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/// Closes currently opened semaphore if needed
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///\param name The name of the semaphore
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///\param oflag The flags with which to open the semaphore
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///\param mode The mode in which to create the semaphore, if O_CREAT is given in oflag, ignored otherwise
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///\param value The initial value of the semaphore if O_CREAT is given in oflag, ignored otherwise
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void semaphore::open(const char *name, int oflag, mode_t mode, unsigned int value, bool noWait){
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close();
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int timer = 0;
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while (!(*this) && timer++ < 10){
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#if defined(__CYGWIN__) || defined(_WIN32)
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std::string semaName = "Global\\";
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semaName += (name + 1);
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if (oflag & O_CREAT){
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if (oflag & O_EXCL){
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// attempt opening, if succes, close handle and return false;
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HANDLE tmpSem = OpenMutex(SYNCHRONIZE, false, semaName.c_str());
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if (tmpSem){
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CloseHandle(tmpSem);
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mySem = 0;
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break;
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}
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}
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SECURITY_ATTRIBUTES security = getSecurityAttributes();
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mySem = CreateMutex(&security, true, semaName.c_str());
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if (value){ReleaseMutex(mySem);}
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}else{
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mySem = OpenMutex(SYNCHRONIZE, false, semaName.c_str());
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}
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if (!(*this)){
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if (GetLastError() == ERROR_FILE_NOT_FOUND && !noWait){// Error code 2
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Util::wait(500);
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}else{
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break;
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}
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}
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#else
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if (oflag & O_CREAT){
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mySem = sem_open(name, oflag, mode, value);
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#if defined(__APPLE__)
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if (!(*this)){
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if (sem_unlink(name) == 0){
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INFO_MSG("Deleted in-use semaphore: %s", name);
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mySem = sem_open(name, oflag, mode, value);
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}
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}
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#endif
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}else{
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mySem = sem_open(name, oflag);
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}
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if (!(*this)){
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if (errno == ENOENT && !noWait){
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Util::wait(500);
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}else{
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break;
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}
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}
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#endif
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}
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if (*this){myName = (char *)name;}
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}
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///\brief Returns the current value of the semaphore
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int semaphore::getVal() const{
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#if defined(__CYGWIN__) || defined(_WIN32)
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LONG res;
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ReleaseSemaphore(mySem, 0, &res); // not really release.... just checking to see if I can get the value this way
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#else
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int res;
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sem_getvalue(mySem, &res);
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#endif
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return res;
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}
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///\brief Posts to the semaphore, increases its value by one
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void semaphore::post(){
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if (!*this || !isLocked){
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FAIL_MSG("Attempted to unlock a non-locked semaphore: '%s'!", myName.c_str());
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#if DEBUG >= DLVL_DEVEL
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BACKTRACE;
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#endif
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return;
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}
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#if defined(__CYGWIN__) || defined(_WIN32)
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ReleaseMutex(mySem);
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#else
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sem_post(mySem);
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#endif
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--isLocked;
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if (!isLocked){
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uint64_t micros = Util::getMicros(lockTime);
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if (micros > 10000){
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INFO_MSG("Semaphore %s was locked for %.3f ms", myName.c_str(), (double)micros / 1000.0);
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}
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}
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}
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///\brief Waits for the semaphore, decreases its value by one
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void semaphore::wait(){
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if (*this){
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#if defined(__CYGWIN__) || defined(_WIN32)
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WaitForSingleObject(mySem, INFINITE);
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#else
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int tmp;
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do{tmp = sem_wait(mySem);}while (tmp == -1 && errno == EINTR);
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#endif
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lockTime = Util::getMicros();
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++isLocked;
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}
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}
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///\brief Tries to wait for the semaphore, returns true if successful, false otherwise
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bool semaphore::tryWait(){
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if (!(*this)){return false;}
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int result;
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#if defined(__CYGWIN__) || defined(_WIN32)
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result = WaitForSingleObject(mySem, 0); // wait at most 1ms
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if (result == 0x80){
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WARN_MSG("Consistency error caught on semaphore %s", myName.c_str());
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result = 0;
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}
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#else
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do{result = sem_trywait(mySem);}while (result == -1 && errno == EINTR);
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#endif
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isLocked += (result == 0 ? 1 : 0);
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if (isLocked == 1){lockTime = Util::getMicros();}
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return isLocked;
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}
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///\brief Tries to wait for the semaphore for a single second, returns true if successful, false otherwise
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bool semaphore::tryWaitOneSecond(){
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if (!(*this)){return false;}
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int result;
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#if defined(__CYGWIN__) || defined(_WIN32)
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result = WaitForSingleObject(mySem, 1000); // wait at most 1s
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if (result == 0x80){
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WARN_MSG("Consistency error caught on semaphore %s", myName.c_str());
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result = 0;
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}
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#elif defined(__APPLE__)
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/// \todo (roxlu) test tryWaitOneSecond, shared_memory.cpp
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uint64_t now = Util::getMicros();
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uint64_t timeout = now + 1e6;
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result = 1;
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while (result && now < timeout){
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result = sem_trywait(mySem);
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usleep(100e3);
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now = Util::getMicros();
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}
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#else
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struct timespec wt;
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wt.tv_sec = 1;
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wt.tv_nsec = 0;
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result = sem_timedwait(mySem, &wt);
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#endif
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isLocked += (result == 0 ? 1 : 0);
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if (isLocked == 1){lockTime = Util::getMicros();}
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return isLocked;
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}
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///\brief Closes the currently opened semaphore
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void semaphore::close(){
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if (*this){
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while (isLocked){post();}
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#if defined(__CYGWIN__) || defined(_WIN32)
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CloseHandle(mySem);
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mySem = 0;
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#else
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sem_close(mySem);
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mySem = SEM_FAILED;
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#endif
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}
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myName.clear();
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}
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/// Closes the semaphore, without unlocking it first.
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/// Intended to be called from forked child processes, to drop the reference to the semaphore.
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void semaphore::abandon(){
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if (*this){
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#if defined(__CYGWIN__) || defined(_WIN32)
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CloseHandle(mySem);
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mySem = 0;
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#else
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sem_close(mySem);
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mySem = SEM_FAILED;
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#endif
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}
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myName.clear();
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}
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/// Unlinks the previously opened semaphore, closing it (if open) in the process.
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void semaphore::unlink(){
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#if defined(__CYGWIN__) || defined(_WIN32)
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while (isLocked){post();}
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#endif
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#if !defined(__CYGWIN__) && !defined(_WIN32)
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if (myName.size()){sem_unlink(myName.c_str());}
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#endif
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if (*this){
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#if defined(__CYGWIN__) || defined(_WIN32)
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CloseHandle(mySem);
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mySem = 0;
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#else
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sem_close(mySem);
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mySem = SEM_FAILED;
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#endif
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}
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myName.clear();
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}
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#if defined(__CYGWIN__) || defined(_WIN32)
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SECURITY_ATTRIBUTES semaphore::getSecurityAttributes(){
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///\todo We really should clean this up sometime probably
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/// We currently have everything static, because the result basically depends on everything
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static SECURITY_ATTRIBUTES result;
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static bool resultValid = false;
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static SECURITY_DESCRIPTOR securityDescriptor;
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if (resultValid){return result;}
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InitializeSecurityDescriptor(&securityDescriptor, SECURITY_DESCRIPTOR_REVISION);
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if (!SetSecurityDescriptorDacl(&securityDescriptor, TRUE, NULL, FALSE)){
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FAIL_MSG("Failed to set pSecurityDescriptor: %u", GetLastError());
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return result;
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}
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result.nLength = sizeof(SECURITY_ATTRIBUTES);
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result.lpSecurityDescriptor = &securityDescriptor;
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result.bInheritHandle = FALSE;
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resultValid = true;
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return result;
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}
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#endif
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/// brief Creates a shared page
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///\param name_ The name of the page to be created
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///\param len_ The size to make the page
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///\param master_ Whether to create or merely open the page
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///\param autoBackoff When only opening the page, wait for it to appear or fail
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sharedPage::sharedPage(const std::string &name_, uint64_t len_, bool master_, bool autoBackoff){
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handle = 0;
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len = 0;
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master = false;
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mapped = 0;
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init(name_, len_, master_, autoBackoff);
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}
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///\brief Creates a copy of a shared page
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///\param rhs The page to copy
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sharedPage::sharedPage(const sharedPage &rhs){
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handle = 0;
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len = 0;
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master = false;
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mapped = 0;
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init(rhs.name, rhs.len, rhs.master);
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}
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///\brief Default destructor
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sharedPage::~sharedPage(){close();}
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#ifdef SHM_ENABLED
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/// Returns true if the open file still exists.
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/// \TODO Not implemented under Windows.
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bool sharedPage::exists(){
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#if defined(__CYGWIN__) || defined(_WIN32)
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return true; // Not implemented under Windows...
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#else
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#ifdef SHM_ENABLED
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struct stat sb;
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if (fstat(handle, &sb)){return false;}
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return (sb.st_nlink > 0);
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#else
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return true;
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#endif
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#endif
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}
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///\brief Unmaps a shared page if allowed
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void sharedPage::unmap(){
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if (mapped){
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#if defined(__CYGWIN__) || defined(_WIN32)
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// under Cygwin, the mapped location is shifted by 4 to contain the page size.
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UnmapViewOfFile(mapped - 4);
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#else
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munmap(mapped, len);
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#endif
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mapped = 0;
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len = 0;
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}
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}
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///\brief Closes a shared page if allowed
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void sharedPage::close(){
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unmap();
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if (handle > 0){
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INSANE_MSG("Closing page %s in %s mode", name.c_str(), master ? "master" : "client");
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#if defined(__CYGWIN__) || defined(_WIN32)
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CloseHandle(handle);
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#else
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::close(handle);
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if (master && name != ""){shm_unlink(name.c_str());}
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#endif
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handle = 0;
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}
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}
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///\brief Returns whether the shared page is valid or not
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sharedPage::operator bool() const{return mapped != 0;}
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///\brief Assignment operator
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void sharedPage::operator=(sharedPage &rhs){
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init(rhs.name, rhs.len, rhs.master);
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/// \todo This is bad. The assignment operator changes the rhs value? What the hell?
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rhs.master = false; // Make sure the memory does not get unlinked
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}
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///\brief Initialize a page, de-initialize before if needed
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///\param name_ The name of the page to be created
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///\param len_ The size to make the page
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///\param master_ Whether to create or merely open the page
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///\param autoBackoff When only opening the page, wait for it to appear or fail
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void sharedPage::init(const std::string &name_, uint64_t len_, bool master_, bool autoBackoff){
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close();
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name = name_;
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len = len_;
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master = master_;
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mapped = 0;
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if (name.size()){
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INSANE_MSG("Opening page %s in %s mode %s auto-backoff", name.c_str(),
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master ? "master" : "client", autoBackoff ? "with" : "without");
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#if defined(__CYGWIN__) || defined(_WIN32)
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if (master){
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// Under cygwin, all pages are 4 bytes longer than claimed.
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handle = CreateFileMappingA(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, 0, len + 4, name.c_str());
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}else{
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int i = 0;
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do{
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if (i != 0){Util::wait(1000);}
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handle = OpenFileMappingA(FILE_MAP_ALL_ACCESS, FALSE, name.c_str());
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i++;
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}while (i < 10 && !handle && autoBackoff);
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}
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if (!handle){
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MEDIUM_MSG("%s for page %s failed with error code %u",
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(master ? "CreateFileMapping" : "OpenFileMapping"), name.c_str(), GetLastError());
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return;
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}
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mapped = (char *)MapViewOfFile(handle, FILE_MAP_ALL_ACCESS, 0, 0, 0);
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if (!mapped){
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FAIL_MSG("MapViewOfFile for page %s failed with error code %u", name.c_str(), GetLastError());
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return;
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}
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// Under cygwin, the extra 4 bytes contain the real size of the page.
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if (master){
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Bit::htobl(mapped, len);
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}else{
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len = Bit::btohl(mapped);
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}
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// Now shift by those 4 bytes.
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mapped += 4;
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#else
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handle = shm_open(name.c_str(), (master ? O_CREAT | O_EXCL : 0) | O_RDWR, ACCESSPERMS);
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if (handle == -1){
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if (master){
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if (len > 1){ERROR_MSG("Overwriting old page for %s", name.c_str());}
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handle = shm_open(name.c_str(), O_CREAT | O_RDWR, ACCESSPERMS);
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}else{
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int i = 0;
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while (i < 10 && handle == -1 && autoBackoff){
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i++;
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Util::wait(1000);
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handle = shm_open(name.c_str(), O_RDWR, ACCESSPERMS);
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}
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}
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}
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if (handle == -1){
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if (!master_ && autoBackoff){
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HIGH_MSG("shm_open for page %s failed: %s", name.c_str(), strerror(errno));
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}
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return;
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}
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if (master){
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if (ftruncate(handle, len) < 0){
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FAIL_MSG("truncate to %" PRIu64 " for page %s failed: %s", len, name.c_str(), strerror(errno));
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return;
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}
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}else{
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struct stat buffStats;
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int xRes = fstat(handle, &buffStats);
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if (xRes < 0){return;}
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len = buffStats.st_size;
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if (!len){
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mapped = 0;
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return;
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}
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}
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mapped = (char *)mmap(0, len, PROT_READ | PROT_WRITE, MAP_SHARED, handle, 0);
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if (mapped == MAP_FAILED){
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FAIL_MSG("mmap for page %s failed: %s", name.c_str(), strerror(errno));
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mapped = 0;
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return;
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}
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#endif
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}
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}
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#endif
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/// brief Creates a shared file
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///\param name_ The name of the file to be created
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///\param len_ The size to make the file
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///\param master_ Whether to create or merely open the file
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///\param autoBackoff When only opening the file, wait for it to appear or fail
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sharedFile::sharedFile(const std::string &name_, uint64_t len_, bool master_, bool autoBackoff)
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: handle(0), name(name_), len(len_), master(master_), mapped(NULL){
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handle = 0;
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name = name_;
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len = len_;
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master = master_;
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mapped = 0;
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init(name_, len_, master_, autoBackoff);
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}
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|
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///\brief Creates a copy of a shared page
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///\param rhs The page to copy
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sharedFile::sharedFile(const sharedFile &rhs){
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handle = 0;
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name = "";
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len = 0;
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master = false;
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mapped = 0;
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init(rhs.name, rhs.len, rhs.master);
|
|
}
|
|
|
|
///\brief Returns whether the shared file is valid or not
|
|
sharedFile::operator bool() const{return mapped != 0;}
|
|
|
|
///\brief Assignment operator
|
|
void sharedFile::operator=(sharedFile &rhs){
|
|
init(rhs.name, rhs.len, rhs.master);
|
|
rhs.master = false; // Make sure the memory does not get unlinked
|
|
}
|
|
|
|
///\brief Unmaps a shared file if allowed
|
|
void sharedFile::unmap(){
|
|
if (mapped && len){
|
|
munmap(mapped, len);
|
|
mapped = 0;
|
|
len = 0;
|
|
}
|
|
}
|
|
|
|
/// Unmaps, closes and unlinks (if master and name is set) the shared file.
|
|
void sharedFile::close(){
|
|
unmap();
|
|
if (handle > 0){
|
|
::close(handle);
|
|
if (master && name != ""){unlink(name.c_str());}
|
|
handle = 0;
|
|
}
|
|
}
|
|
|
|
/// Returns true if the open file still exists.
|
|
bool sharedFile::exists(){
|
|
struct stat sb;
|
|
if (fstat(handle, &sb)){return false;}
|
|
return (sb.st_nlink > 0);
|
|
}
|
|
|
|
///\brief Initialize a page, de-initialize before if needed
|
|
///\param name_ The name of the page to be created
|
|
///\param len_ The size to make the page
|
|
///\param master_ Whether to create or merely open the page
|
|
///\param autoBackoff When only opening the page, wait for it to appear or fail
|
|
void sharedFile::init(const std::string &name_, uint64_t len_, bool master_, bool autoBackoff){
|
|
close();
|
|
name = name_;
|
|
len = len_;
|
|
master = master_;
|
|
mapped = 0;
|
|
if (name.size()){
|
|
/// \todo Use ACCESSPERMS instead of 0600?
|
|
handle = open(std::string(Util::getTmpFolder() + name).c_str(),
|
|
(master ? O_CREAT | O_TRUNC | O_EXCL : 0) | O_RDWR, (mode_t)0600);
|
|
if (handle == -1){
|
|
if (master){
|
|
HIGH_MSG("Overwriting old file for %s", name.c_str());
|
|
handle = open(std::string(Util::getTmpFolder() + name).c_str(),
|
|
O_CREAT | O_TRUNC | O_RDWR, (mode_t)0600);
|
|
}else{
|
|
int i = 0;
|
|
while (i < 10 && handle == -1 && autoBackoff){
|
|
i++;
|
|
Util::wait(1000);
|
|
handle = open(std::string(Util::getTmpFolder() + name).c_str(), O_RDWR, (mode_t)0600);
|
|
}
|
|
}
|
|
}
|
|
if (handle == -1){
|
|
HIGH_MSG("shf_open for page %s failed: %s", name.c_str(), strerror(errno));
|
|
return;
|
|
}
|
|
if (master){
|
|
if (ftruncate(handle, len) < 0){
|
|
INFO_MSG("ftruncate to len for shf page %s failed: %s", name.c_str(), strerror(errno));
|
|
return;
|
|
}
|
|
}else{
|
|
struct stat buffStats;
|
|
int xRes = fstat(handle, &buffStats);
|
|
if (xRes < 0){return;}
|
|
len = buffStats.st_size;
|
|
}
|
|
mapped = (char *)mmap(0, len, PROT_READ | PROT_WRITE, MAP_SHARED, handle, 0);
|
|
if (mapped == MAP_FAILED){
|
|
mapped = 0;
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
///\brief Default destructor
|
|
sharedFile::~sharedFile(){close();}
|
|
|
|
///\brief StatExchange constructor, sets the datapointer to the given value
|
|
statExchange::statExchange(char *_data) : data(_data){}
|
|
|
|
///\brief Sets timestamp of the current stats
|
|
void statExchange::now(long long int time){Bit::htobll(data, time);}
|
|
|
|
///\brief Gets timestamp of the current stats
|
|
long long int statExchange::now(){
|
|
long long int result;
|
|
return Bit::btohll(data);
|
|
}
|
|
|
|
///\brief Sets time currently connected
|
|
void statExchange::time(long time){Bit::htobl(data + 8, time);}
|
|
|
|
/// Calculates session ID from CRC, stream name, connector and host.
|
|
std::string statExchange::getSessId(){return Secure::md5(data + 32, 140);}
|
|
|
|
///\brief Gets time currently connected
|
|
long statExchange::time(){return Bit::btohl(data + 8);}
|
|
|
|
///\brief Sets the last viewing second of this user
|
|
void statExchange::lastSecond(long time){Bit::htobl(data + 12, time);}
|
|
|
|
///\brief Gets the last viewing second of this user
|
|
long statExchange::lastSecond(){return Bit::btohl(data + 12);}
|
|
|
|
///\brief Sets the amount of bytes received
|
|
void statExchange::down(long long int bytes){Bit::htobll(data + 16, bytes);}
|
|
|
|
///\brief Gets the amount of bytes received
|
|
long long int statExchange::down(){return Bit::btohll(data + 16);}
|
|
|
|
///\brief Sets the amount of bytes sent
|
|
void statExchange::up(long long int bytes){Bit::htobll(data + 24, bytes);}
|
|
|
|
///\brief Gets the amount of bytes sent
|
|
long long int statExchange::up(){return Bit::btohll(data + 24);}
|
|
|
|
///\brief Sets the host of this connection
|
|
void statExchange::host(std::string name){
|
|
if (name.size() < 16){memset(data + 32, 0, 16);}
|
|
memcpy(data + 32, name.c_str(), std::min((int)name.size(), 16));
|
|
}
|
|
|
|
///\brief Gets the host of this connection
|
|
std::string statExchange::host(){return std::string(data + 32, 16);}
|
|
|
|
///\brief Sets the name of the stream this user is viewing
|
|
void statExchange::streamName(std::string name){
|
|
size_t splitChar = name.find_first_of("+ ");
|
|
if (splitChar != std::string::npos){name[splitChar] = '+';}
|
|
snprintf(data + 48, 100, "%s", name.c_str());
|
|
}
|
|
|
|
///\brief Gets the name of the stream this user is viewing
|
|
std::string statExchange::streamName(){return std::string(data + 48, strnlen(data + 48, 100));}
|
|
|
|
///\brief Sets the name of the connector through which this user is viewing
|
|
void statExchange::connector(std::string name){snprintf(data + 148, 20, "%s", name.c_str());}
|
|
|
|
///\brief Gets the name of the connector through which this user is viewing
|
|
std::string statExchange::connector(){
|
|
return std::string(data + 148, std::min((int)strlen(data + 148), 20));
|
|
}
|
|
|
|
///\brief Sets checksum field
|
|
void statExchange::crc(unsigned int sum){Bit::htobl(data + 168, sum);}
|
|
|
|
///\brief Gets checksum field
|
|
unsigned int statExchange::crc(){return Bit::btohl(data + 168);}
|
|
|
|
///\brief Sets checksum field
|
|
void statExchange::setSync(char s){data[172] = s;}
|
|
|
|
///\brief Gets checksum field
|
|
char statExchange::getSync(){return data[172];}
|
|
|
|
///\brief Gets PID field
|
|
uint32_t statExchange::getPID(){return *(uint32_t *)(data + 173);}
|
|
|
|
///\brief Creates a semaphore guard, locks the semaphore on call
|
|
semGuard::semGuard(semaphore *thisSemaphore) : mySemaphore(thisSemaphore){mySemaphore->wait();}
|
|
|
|
///\brief Destructs a semaphore guard, unlocks the semaphore on call
|
|
semGuard::~semGuard(){mySemaphore->post();}
|
|
|
|
///\brief Default constructor, erases all the values
|
|
sharedServer::sharedServer(){
|
|
payLen = 0;
|
|
hasCounter = false;
|
|
amount = 0;
|
|
}
|
|
|
|
///\brief Desired constructor, initializes after cleaning.
|
|
///\param name The basename of this server
|
|
///\param len The lenght of the payload
|
|
///\param withCounter Whether the content should have a counter
|
|
sharedServer::sharedServer(std::string name, int len, bool withCounter){
|
|
sharedServer();
|
|
init(name, len, withCounter);
|
|
}
|
|
|
|
///\brief Initialize the server
|
|
///\param name The basename of this server
|
|
///\param len The lenght of the payload
|
|
///\param withCounter Whether the content should have a counter
|
|
void sharedServer::init(std::string name, int len, bool withCounter){
|
|
if (mySemaphore){mySemaphore.close();}
|
|
if (baseName != ""){mySemaphore.unlink();}
|
|
myPages.clear();
|
|
baseName = "/" + name;
|
|
payLen = len;
|
|
hasCounter = withCounter;
|
|
mySemaphore.open(baseName.c_str(), O_CREAT | O_RDWR, ACCESSPERMS, 1);
|
|
if (!mySemaphore){
|
|
DEBUG_MSG(DLVL_FAIL, "Creating semaphore failed: %s", strerror(errno));
|
|
return;
|
|
}else{
|
|
semGuard tmpGuard(&mySemaphore);
|
|
amount = 0;
|
|
newPage();
|
|
}
|
|
}
|
|
|
|
///\brief The deconstructor
|
|
sharedServer::~sharedServer(){mySemaphore.unlink();}
|
|
|
|
///\brief Determines whether a sharedServer is valid
|
|
sharedServer::operator bool() const{return myPages.size();}
|
|
|
|
/// Sets all currently loaded memory pages to non-master, so they are not cleaned up on
|
|
/// destruction, but left behind. Useful for doing rolling updates and such.
|
|
void sharedServer::abandon(){
|
|
if (!myPages.size()){return;}
|
|
VERYHIGH_MSG("Abandoning %llu memory pages, leaving them behind on purpose", myPages.size());
|
|
for (std::deque<sharedPage>::iterator it = myPages.begin(); it != myPages.end(); it++){
|
|
(*it).master = false;
|
|
}
|
|
}
|
|
|
|
///\brief Creates the next page with the correct size
|
|
void sharedServer::newPage(){
|
|
sharedPage tmp(std::string(baseName.substr(1) + (char)(myPages.size() + (int)'A')),
|
|
std::min(((8192 * 2) << myPages.size()), (32 * 1024 * 1024)), false, false);
|
|
if (!tmp.mapped){
|
|
tmp.init(std::string(baseName.substr(1) + (char)(myPages.size() + (int)'A')),
|
|
std::min(((8192 * 2) << myPages.size()), (32 * 1024 * 1024)), true);
|
|
tmp.master = false;
|
|
}
|
|
myPages.push_back(tmp);
|
|
myPages.back().master = true;
|
|
VERYHIGH_MSG("Created a new page: %s", tmp.name.c_str());
|
|
amount += (32 * 1024 * 1024) * myPages.size(); // assume maximum load - we don't want to miss any entries
|
|
}
|
|
|
|
///\brief Deletes the highest allocated page
|
|
void sharedServer::deletePage(){
|
|
if (myPages.size() == 1){
|
|
DEBUG_MSG(DLVL_WARN, "Can't remove last page for %s", baseName.c_str());
|
|
return;
|
|
}
|
|
myPages.pop_back();
|
|
}
|
|
|
|
///\brief Determines whether an id is currently in use or not
|
|
bool sharedServer::isInUse(unsigned int id){
|
|
unsigned int i = 0;
|
|
for (std::deque<sharedPage>::iterator it = myPages.begin(); it != myPages.end(); it++){
|
|
// return if we reached the end
|
|
if (!it->mapped || !it->len){return false;}
|
|
// not on this page? skip to next.
|
|
if (it->len < (id - i) * payLen){
|
|
i += it->len / payLen;
|
|
continue;
|
|
}
|
|
if (hasCounter){
|
|
// counter? return true if it is non-zero.
|
|
return (it->mapped[(id - i) * payLen] != 0);
|
|
}else{
|
|
// no counter - check the entire size for being all zeroes.
|
|
for (unsigned int j = 0; j < payLen; ++j){
|
|
if (it->mapped[(id - i) * payLen + j]){return true;}
|
|
}
|
|
return false;
|
|
}
|
|
}
|
|
// only happens if we run out of pages
|
|
return false;
|
|
}
|
|
|
|
/// Disconnect all connected users, waits at most 2.5 seconds until completed
|
|
void sharedServer::finishEach(){
|
|
if (!hasCounter){return;}
|
|
unsigned int c = 0; // to prevent eternal loops
|
|
do{
|
|
parseEach(killStatistics);
|
|
Util::wait(250);
|
|
}while (amount > 1 && c++ < 10);
|
|
}
|
|
|
|
/// Returns a pointer to the data for the given index.
|
|
/// Returns null on error or if index is empty.
|
|
char *sharedServer::getIndex(unsigned int requestId){
|
|
char *empty = 0;
|
|
if (!hasCounter){
|
|
empty = (char *)malloc(payLen * sizeof(char));
|
|
memset(empty, 0, payLen);
|
|
}
|
|
unsigned int id = 0;
|
|
for (std::deque<sharedPage>::iterator it = myPages.begin(); it != myPages.end(); it++){
|
|
if (!it->mapped || !it->len){
|
|
DEBUG_MSG(DLVL_FAIL, "Something went terribly wrong?");
|
|
return 0;
|
|
}
|
|
unsigned int offset = 0;
|
|
while (offset + payLen + (hasCounter ? 1 : 0) <= it->len){
|
|
if (id == requestId){
|
|
if (hasCounter){
|
|
if (it->mapped[offset] != 0){
|
|
return it->mapped + offset + 1;
|
|
}else{
|
|
return 0;
|
|
}
|
|
}else{
|
|
if (memcmp(empty, it->mapped + offset, payLen)){
|
|
return it->mapped + offset;
|
|
}else{
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
offset += payLen + (hasCounter ? 1 : 0);
|
|
id++;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
///\brief Parse each of the possible payload pieces, and runs a callback on it if in use.
|
|
void sharedServer::parseEach(void (*activeCallback)(char *data, size_t len, unsigned int id),
|
|
void (*disconCallback)(char *data, size_t len, unsigned int id)){
|
|
char *empty = 0;
|
|
if (!hasCounter){
|
|
empty = (char *)malloc(payLen * sizeof(char));
|
|
memset(empty, 0, payLen);
|
|
}
|
|
unsigned int id = 0;
|
|
unsigned int userCount = 0;
|
|
unsigned int emptyCount = 0;
|
|
unsigned int lastFilled = 0;
|
|
connectedUsers = 0;
|
|
for (std::deque<sharedPage>::iterator it = myPages.begin(); it != myPages.end(); it++){
|
|
if (!it->mapped || !it->len){
|
|
DEBUG_MSG(DLVL_FAIL, "Something went terribly wrong?");
|
|
break;
|
|
}
|
|
userCount = 0;
|
|
unsigned int offset = 0;
|
|
while (offset + payLen + (hasCounter ? 1 : 0) <= it->len){
|
|
if (hasCounter){
|
|
if (it->mapped[offset] != 0){
|
|
char *counter = it->mapped + offset;
|
|
// increase the count if needed
|
|
++userCount;
|
|
if (*counter & 0x80){connectedUsers++;}
|
|
char countNum = (*counter) & 0x7F;
|
|
lastFilled = id;
|
|
if (id >= amount){
|
|
amount = id + 1;
|
|
VERYHIGH_MSG("Shared memory %s is now at count %u", baseName.c_str(), amount);
|
|
}
|
|
uint32_t tmpPID = *((uint32_t *)(it->mapped + 1 + offset + payLen - 4));
|
|
if (tmpPID > 1 && it->master && !Util::Procs::isRunning(tmpPID) &&
|
|
!(countNum == 126 || countNum == 127)){
|
|
WARN_MSG("process disappeared, timing out. (pid %lu)", tmpPID);
|
|
*counter = 125 | (0x80 & (*counter)); // if process is already dead, instant timeout.
|
|
}
|
|
activeCallback(it->mapped + offset + 1, payLen, id);
|
|
switch (countNum){
|
|
case 127: HIGH_MSG("Client %u requested disconnect", id); break;
|
|
case 126: HIGH_MSG("Client %u timed out", id); break;
|
|
default:
|
|
#ifndef NOCRASHCHECK
|
|
if (tmpPID > 1 && it->master){
|
|
if (countNum > 10 && countNum < 60){
|
|
if (countNum < 30){
|
|
if (countNum > 15){WARN_MSG("Process %d is unresponsive", tmpPID);}
|
|
Util::Procs::Stop(tmpPID); // soft kill
|
|
}else{
|
|
ERROR_MSG("Killing unresponsive process %d", tmpPID);
|
|
Util::Procs::Murder(tmpPID); // improved kill
|
|
}
|
|
}
|
|
if (countNum > 70){
|
|
if (countNum < 90){
|
|
if (countNum > 75){WARN_MSG("Stopping process %d is unresponsive", tmpPID);}
|
|
Util::Procs::Stop(tmpPID); // soft kill
|
|
}else{
|
|
ERROR_MSG("Killing unresponsive stopping process %d", tmpPID);
|
|
Util::Procs::Murder(tmpPID); // improved kill
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
break;
|
|
}
|
|
if (countNum == 127 || countNum == 126){
|
|
semGuard tmpGuard(&mySemaphore);
|
|
if (disconCallback){disconCallback(counter + 1, payLen, id);}
|
|
memset(counter + 1, 0, payLen);
|
|
*counter = 0;
|
|
}else{
|
|
++(*counter);
|
|
}
|
|
}else{
|
|
// stop if we're past the amount counted and we're empty
|
|
if (id >= amount){
|
|
// bring the counter down if this was the last element
|
|
if (lastFilled + 1 < amount){
|
|
amount = lastFilled + 1;
|
|
VERYHIGH_MSG("Shared memory %s is now at count %u", baseName.c_str(), amount);
|
|
}
|
|
if (id >= amount + 100){
|
|
// stop, we're guaranteed no more pages are full at this point
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}else{
|
|
if (memcmp(empty, it->mapped + offset, payLen)){
|
|
++userCount;
|
|
// increase the count if needed
|
|
lastFilled = id;
|
|
if (id >= amount){
|
|
amount = id + 1;
|
|
VERYHIGH_MSG("Shared memory %s is now at count %u", baseName.c_str(), amount);
|
|
}
|
|
activeCallback(it->mapped + offset, payLen, id);
|
|
}else{
|
|
// stop if we're past the amount counted and we're empty
|
|
if (id >= amount){
|
|
// bring the counter down if this was the last element
|
|
if (lastFilled + 1 < amount){
|
|
amount = lastFilled + 1;
|
|
VERYHIGH_MSG("Shared memory %s is now at count %u", baseName.c_str(), amount);
|
|
}
|
|
if (id >= amount + 100){
|
|
// stop, we're guaranteed no more pages are full at this point
|
|
if (empty){free(empty);}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
offset += payLen + (hasCounter ? 1 : 0);
|
|
id++;
|
|
}
|
|
if (userCount == 0){
|
|
++emptyCount;
|
|
}else{
|
|
emptyCount = 0;
|
|
std::deque<sharedPage>::iterator tIt = it;
|
|
if (++tIt == myPages.end()){
|
|
bool unsetMaster = !(it->master);
|
|
semGuard tmpGuard(&mySemaphore);
|
|
newPage();
|
|
if (unsetMaster){(myPages.end() - 1)->master = false;}
|
|
it = myPages.end() - 2;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (emptyCount > 1){
|
|
semGuard tmpGuard(&mySemaphore);
|
|
deletePage();
|
|
}
|
|
|
|
if (empty){free(empty);}
|
|
}
|
|
|
|
///\brief Creates an empty shared client
|
|
sharedClient::sharedClient(){
|
|
hasCounter = 0;
|
|
payLen = 0;
|
|
offsetOnPage = 0;
|
|
countAsViewer = true;
|
|
}
|
|
|
|
///\brief Copy constructor for sharedClients
|
|
///\param rhs The client ro copy
|
|
sharedClient::sharedClient(const sharedClient &rhs){
|
|
countAsViewer = rhs.countAsViewer;
|
|
baseName = rhs.baseName;
|
|
payLen = rhs.payLen;
|
|
hasCounter = rhs.hasCounter;
|
|
#ifdef __APPLE__
|
|
// note: O_CREAT is only needed for mac, probably
|
|
mySemaphore.open(baseName.c_str(), O_RDWR | O_CREAT, 0);
|
|
#else
|
|
mySemaphore.open(baseName.c_str(), O_RDWR);
|
|
#endif
|
|
if (!mySemaphore){
|
|
DEBUG_MSG(DLVL_FAIL, "Creating semaphore failed: %s", strerror(errno));
|
|
return;
|
|
}
|
|
myPage.init(rhs.myPage.name, rhs.myPage.len, rhs.myPage.master);
|
|
offsetOnPage = rhs.offsetOnPage;
|
|
}
|
|
|
|
///\brief Assignment operator
|
|
void sharedClient::operator=(const sharedClient &rhs){
|
|
countAsViewer = rhs.countAsViewer;
|
|
baseName = rhs.baseName;
|
|
payLen = rhs.payLen;
|
|
hasCounter = rhs.hasCounter;
|
|
#ifdef __APPLE__
|
|
// note: O_CREAT is only needed for mac, probably
|
|
mySemaphore.open(baseName.c_str(), O_RDWR | O_CREAT, 0);
|
|
#else
|
|
mySemaphore.open(baseName.c_str(), O_RDWR);
|
|
#endif
|
|
if (!mySemaphore){
|
|
DEBUG_MSG(DLVL_FAIL, "Creating copy of semaphore %s failed: %s", baseName.c_str(), strerror(errno));
|
|
return;
|
|
}
|
|
myPage.init(rhs.myPage.name, rhs.myPage.len, rhs.myPage.master);
|
|
offsetOnPage = rhs.offsetOnPage;
|
|
}
|
|
|
|
///\brief SharedClient Constructor, allocates space on the correct page.
|
|
///\param name The basename of the server to connect to
|
|
///\param len The size of the payload to allocate
|
|
///\param withCounter Whether or not this payload has a counter
|
|
sharedClient::sharedClient(std::string name, int len, bool withCounter)
|
|
: baseName("/" + name), payLen(len), offsetOnPage(-1), hasCounter(withCounter){
|
|
countAsViewer = true;
|
|
#ifdef __APPLE__
|
|
// note: O_CREAT is only needed for mac, probably
|
|
mySemaphore.open(baseName.c_str(), O_RDWR | O_CREAT, 0);
|
|
#else
|
|
mySemaphore.open(baseName.c_str(), O_RDWR);
|
|
#endif
|
|
if (!mySemaphore){
|
|
DEBUG_MSG(DLVL_FAIL, "Creating semaphore %s failed: %s", baseName.c_str(), strerror(errno));
|
|
return;
|
|
}
|
|
// Empty is used to compare for emptyness. This is not needed when the page uses a counter
|
|
char *empty = 0;
|
|
if (!hasCounter){
|
|
empty = (char *)malloc(payLen * sizeof(char));
|
|
if (!empty){
|
|
DEBUG_MSG(DLVL_FAIL, "Failed to allocate %u bytes for empty payload!", payLen);
|
|
return;
|
|
}
|
|
memset(empty, 0, payLen);
|
|
}
|
|
uint32_t attempts = 0;
|
|
while (offsetOnPage == -1 && (++attempts) < 20){
|
|
for (char i = 'A'; i <= 'Z'; i++){
|
|
myPage.init(baseName.substr(1) + i, (4096 << (i - 'A')), false, false);
|
|
if (!myPage.mapped){break;}
|
|
int offset = 0;
|
|
while (offset + payLen + (hasCounter ? 1 : 0) <= myPage.len){
|
|
if ((hasCounter && myPage.mapped[offset] == 0) ||
|
|
(!hasCounter && !memcmp(myPage.mapped + offset, empty, payLen))){
|
|
semGuard tmpGuard(&mySemaphore);
|
|
if ((hasCounter && myPage.mapped[offset] == 0) ||
|
|
(!hasCounter && !memcmp(myPage.mapped + offset, empty, payLen))){
|
|
offsetOnPage = offset;
|
|
if (hasCounter){
|
|
myPage.mapped[offset] = 1;
|
|
*((uint32_t *)(myPage.mapped + 1 + offset + len - 4)) = getpid();
|
|
HIGH_MSG("sharedClient received ID %d", offsetOnPage / (payLen + 1));
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
offset += payLen + (hasCounter ? 1 : 0);
|
|
}
|
|
if (offsetOnPage != -1){break;}
|
|
}
|
|
if (offsetOnPage == -1){Util::wait(500);}
|
|
}
|
|
if (offsetOnPage == -1){
|
|
FAIL_MSG("Could not register on page for %s", baseName.c_str());
|
|
myPage.close();
|
|
}
|
|
if (empty){free(empty);}
|
|
}
|
|
|
|
///\brief The deconstructor
|
|
sharedClient::~sharedClient(){mySemaphore.close();}
|
|
|
|
///\brief Writes data to the shared data
|
|
void sharedClient::write(char *data, int len){
|
|
if (hasCounter){keepAlive();}
|
|
memcpy(myPage.mapped + offsetOnPage + (hasCounter ? 1 : 0), data, std::min(len, payLen));
|
|
}
|
|
|
|
///\brief Indicate that the process is done using this piece of memory, set the counter to finished
|
|
void sharedClient::finish(){
|
|
if (!myPage.mapped){return;}
|
|
if (!hasCounter){
|
|
DEBUG_MSG(DLVL_WARN, "Trying to time-out an element without counters");
|
|
myPage.close();
|
|
return;
|
|
}
|
|
semGuard tmpGuard(&mySemaphore);
|
|
myPage.mapped[offsetOnPage] = 126 | (countAsViewer ? 0x80 : 0);
|
|
HIGH_MSG("sharedClient finished ID %d", offsetOnPage / (payLen + 1));
|
|
myPage.close();
|
|
}
|
|
|
|
///\brief Re-initialize the counter
|
|
void sharedClient::keepAlive(){
|
|
if (!hasCounter){
|
|
DEBUG_MSG(DLVL_WARN, "Trying to keep-alive an element without counters");
|
|
return;
|
|
}
|
|
if (isAlive()){myPage.mapped[offsetOnPage] = (countAsViewer ? 0x81 : 0x01);}
|
|
}
|
|
|
|
bool sharedClient::isAlive(){
|
|
if (!hasCounter){return (myPage.mapped != 0);}
|
|
if (myPage.mapped && offsetOnPage >= 0){return (myPage.mapped[offsetOnPage] & 0x7F) < 60;}
|
|
return false;
|
|
}
|
|
|
|
///\brief Get a pointer to the data of this client
|
|
char *sharedClient::getData(){
|
|
if (!myPage.mapped){return 0;}
|
|
return (myPage.mapped + offsetOnPage + (hasCounter ? 1 : 0));
|
|
}
|
|
|
|
int sharedClient::getCounter(){
|
|
if (!hasCounter){return -1;}
|
|
if (!myPage.mapped){return 0;}
|
|
return *(myPage.mapped + offsetOnPage);
|
|
}
|
|
|
|
userConnection::userConnection(char *_data){
|
|
data = _data;
|
|
if (!data){WARN_MSG("userConnection created with null pointer!");}
|
|
}
|
|
|
|
unsigned long userConnection::getTrackId(size_t offset) const{
|
|
if (offset >= SIMUL_TRACKS){
|
|
WARN_MSG("Trying to get track id for entry %lu, while there are only %d entries allowed", offset, SIMUL_TRACKS);
|
|
return 0;
|
|
}
|
|
return Bit::btohl(data + (offset * 6));
|
|
}
|
|
|
|
void userConnection::setTrackId(size_t offset, unsigned long trackId) const{
|
|
if (offset >= SIMUL_TRACKS){
|
|
WARN_MSG("Trying to set track id for entry %lu, while there are only %d entries allowed", offset, SIMUL_TRACKS);
|
|
return;
|
|
}
|
|
Bit::htobl(data + (offset * 6), trackId);
|
|
}
|
|
|
|
unsigned long userConnection::getKeynum(size_t offset) const{
|
|
if (offset >= SIMUL_TRACKS){
|
|
WARN_MSG("Trying to get keynum for entry %lu, while there are only %d entries allowed", offset, SIMUL_TRACKS);
|
|
return 0;
|
|
}
|
|
return Bit::btohs(data + (offset * 6) + 4);
|
|
}
|
|
|
|
void userConnection::setKeynum(size_t offset, unsigned long keynum){
|
|
if (offset >= SIMUL_TRACKS){
|
|
WARN_MSG("Trying to set keynum for entry %lu, while there are only %d entries allowed", offset, SIMUL_TRACKS);
|
|
return;
|
|
}
|
|
Bit::htobs(data + (offset * 6) + 4, keynum);
|
|
}
|
|
}// namespace IPC
|