519 lines
13 KiB
C++
519 lines
13 KiB
C++
/*
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www.sourceforge.net/projects/dfhack
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Copyright (c) 2009 Petr Mrázek (peterix), Kenneth Ferland (Impaler[WrG]), dorf
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any
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damages arising from the use of this software.
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Permission is granted to anyone to use this software for any
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purpose, including commercial applications, and to alter it and
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redistribute it freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must
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not claim that you wrote the original software. If you use this
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software in a product, an acknowledgment in the product documentation
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would be appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and
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must not be misrepresented as being the original software.
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3. This notice may not be removed or altered from any source
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distribution.
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*/
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#include "DFCommonInternal.h"
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#include <errno.h>
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using namespace DFHack;
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class NormalProcess::Private
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{
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public:
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Private()
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{
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my_datamodel = NULL;
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my_descriptor = NULL;
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my_handle = NULL;
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my_window = NULL;
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my_pid = 0;
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attached = false;
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suspended = false;
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memFileHandle = 0;
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};
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~Private(){};
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DataModel* my_datamodel;
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DFWindow* my_window;
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memory_info * my_descriptor;
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ProcessHandle my_handle;
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uint32_t my_pid;
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string memFile;
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int memFileHandle;
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bool attached;
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bool suspended;
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bool identified;
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bool validate(char * exe_file, uint32_t pid, char * mem_file, vector <memory_info> & known_versions);
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};
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NormalProcess::NormalProcess(uint32_t pid, vector <memory_info> & known_versions)
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: d(new Private())
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{
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char dir_name [256];
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char exe_link_name [256];
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char mem_name [256];
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char cwd_name [256];
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char cmdline_name [256];
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char target_name[1024];
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int target_result;
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d->identified = false;
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sprintf(dir_name,"/proc/%d/", pid);
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sprintf(exe_link_name,"/proc/%d/exe", pid);
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sprintf(mem_name,"/proc/%d/mem", pid);
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sprintf(cwd_name,"/proc/%d/cwd", pid);
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sprintf(cmdline_name,"/proc/%d/cmdline", pid);
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// resolve /proc/PID/exe link
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target_result = readlink(exe_link_name, target_name, sizeof(target_name)-1);
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if (target_result == -1)
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{
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return;
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}
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// make sure we have a null terminated string...
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target_name[target_result] = 0;
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// is this the regular linux DF?
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if (strstr(target_name, "dwarfort.exe") != NULL)
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{
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// create linux process, add it to the vector
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d->identified = d->validate(target_name,pid,mem_name,known_versions );
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d->my_window = new DFWindow(this);
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return;
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}
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// FIXME: this fails when the wine process isn't started from the 'current working directory'. strip path data from cmdline
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// is this windows version of Df running in wine?
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if(strstr(target_name, "wine-preloader")!= NULL)
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{
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// get working directory
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target_result = readlink(cwd_name, target_name, sizeof(target_name)-1);
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target_name[target_result] = 0;
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// got path to executable, do the same for its name
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ifstream ifs ( cmdline_name , ifstream::in );
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string cmdline;
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getline(ifs,cmdline);
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if (cmdline.find("dwarfort-w.exe") != string::npos || cmdline.find("dwarfort.exe") != string::npos || cmdline.find("Dwarf Fortress.exe") != string::npos)
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{
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char exe_link[1024];
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// put executable name and path together
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sprintf(exe_link,"%s/%s",target_name,cmdline.c_str());
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// create wine process, add it to the vector
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d->identified = d->validate(exe_link,pid,mem_name,known_versions);
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d->my_window = new DFWindow(this);
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return;
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}
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}
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}
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bool NormalProcess::isSuspended()
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{
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return d->suspended;
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}
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bool NormalProcess::isAttached()
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{
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return d->attached;
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}
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bool NormalProcess::isIdentified()
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{
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return d->identified;
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}
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bool NormalProcess::Private::validate(char * exe_file,uint32_t pid, char * memFile, vector <memory_info> & known_versions)
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{
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md5wrapper md5;
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// get hash of the running DF process
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string hash = md5.getHashFromFile(exe_file);
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vector<memory_info>::iterator it;
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// iterate over the list of memory locations
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for ( it=known_versions.begin() ; it < known_versions.end(); it++ )
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{
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if(hash == (*it).getString("md5")) // are the md5 hashes the same?
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{
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memory_info * m = &*it;
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// df can run under wine on Linux
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if(memory_info::OS_WINDOWS == (*it).getOS())
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{
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my_datamodel =new DMWindows40d();
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my_descriptor = m;
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my_handle = my_pid = pid;
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}
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else if (memory_info::OS_LINUX == (*it).getOS())
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{
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my_datamodel =new DMLinux40d();
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my_descriptor = m;
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my_handle = my_pid = pid;
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}
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else
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{
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// some error happened, continue with next process
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continue;
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}
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// tell NormalProcess about the /proc/PID/mem file
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this->memFile = memFile;
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identified = true;
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return true;
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}
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}
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return false;
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}
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NormalProcess::~NormalProcess()
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{
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if(d->attached)
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{
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detach();
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}
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// destroy data model. this is assigned by processmanager
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if(d->my_datamodel)
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delete d->my_datamodel;
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if(d->my_window)
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delete d->my_window;
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delete d;
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}
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DataModel *NormalProcess::getDataModel()
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{
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return d->my_datamodel;
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}
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memory_info * NormalProcess::getDescriptor()
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{
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return d->my_descriptor;
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}
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DFWindow * NormalProcess::getWindow()
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{
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return d->my_window;
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}
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int NormalProcess::getPID()
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{
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return d->my_pid;
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}
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//FIXME: implement
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bool NormalProcess::getThreadIDs(vector<uint32_t> & threads )
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{
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return false;
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}
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//FIXME: cross-reference with ELF segment entries?
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void NormalProcess::getMemRanges( vector<t_memrange> & ranges )
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{
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char buffer[1024];
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char permissions[5]; // r/-, w/-, x/-, p/s, 0
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sprintf(buffer, "/proc/%lu/maps", d->my_pid);
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FILE *mapFile = ::fopen(buffer, "r");
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uint64_t offset, device1, device2, node;
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while (fgets(buffer, 1024, mapFile))
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{
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t_memrange temp;
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temp.name[0] = 0;
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sscanf(buffer, "%llx-%llx %s %llx %2llu:%2llu %llu %s",
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&temp.start,
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&temp.end,
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(char*)&permissions,
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&offset, &device1, &device2, &node,
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(char*)&temp.name);
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temp.read = permissions[0] == 'r';
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temp.write = permissions[1] == 'w';
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temp.execute = permissions[2] == 'x';
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ranges.push_back(temp);
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}
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}
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bool NormalProcess::suspend()
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{
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int status;
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if(!d->attached)
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return false;
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if(d->suspended)
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return true;
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if (kill(d->my_handle, SIGSTOP) == -1)
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{
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// no, we got an error
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perror("kill SIGSTOP error");
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return false;
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}
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while(true)
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{
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// we wait on the pid
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pid_t w = waitpid(d->my_handle, &status, 0);
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if (w == -1)
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{
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// child died
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perror("DF exited during suspend call");
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return false;
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}
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// stopped -> let's continue
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if (WIFSTOPPED(status))
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{
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break;
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}
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}
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d->suspended = true;
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return true;
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}
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bool NormalProcess::forceresume()
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{
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return resume();
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}
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bool NormalProcess::resume()
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{
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if(!d->attached)
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return false;
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if(!d->suspended)
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return true;
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if (ptrace(PTRACE_CONT, d->my_handle, NULL, NULL) == -1)
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{
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// no, we got an error
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perror("ptrace resume error");
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return false;
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}
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d->suspended = false;
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return true;
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}
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bool NormalProcess::attach()
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{
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int status;
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if(g_pProcess != NULL)
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{
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return false;
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}
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// can we attach?
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if (ptrace(PTRACE_ATTACH , d->my_handle, NULL, NULL) == -1)
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{
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// no, we got an error
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perror("ptrace attach error");
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cerr << "attach failed on pid " << d->my_handle << endl;
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return false;
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}
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while(true)
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{
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// we wait on the pid
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pid_t w = waitpid(d->my_handle, &status, 0);
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if (w == -1)
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{
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// child died
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perror("wait inside attach()");
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return false;
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}
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// stopped -> let's continue
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if (WIFSTOPPED(status))
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{
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break;
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}
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}
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d->suspended = true;
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int proc_pid_mem = open(d->memFile.c_str(),O_RDONLY);
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if(proc_pid_mem == -1)
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{
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ptrace(PTRACE_DETACH, d->my_handle, NULL, NULL);
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cerr << "couldn't open /proc/" << d->my_handle << "/mem" << endl;
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perror("open(memFile.c_str(),O_RDONLY)");
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return false;
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}
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else
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{
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d->attached = true;
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g_pProcess = this;
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d->memFileHandle = proc_pid_mem;
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return true; // we are attached
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}
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}
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bool NormalProcess::detach()
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{
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if(!d->attached) return false;
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if(!d->suspended) suspend();
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int result = 0;
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// close /proc/PID/mem
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result = close(d->memFileHandle);
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if(result == -1)
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{
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cerr << "couldn't close /proc/"<< d->my_handle <<"/mem" << endl;
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perror("mem file close");
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return false;
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}
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else
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{
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// detach
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result = ptrace(PTRACE_DETACH, d->my_handle, NULL, NULL);
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if(result == -1)
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{
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cerr << "couldn't detach from process pid" << d->my_handle << endl;
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perror("ptrace detach");
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return false;
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}
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else
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{
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d->attached = false;
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g_pProcess = NULL;
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return true;
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}
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}
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}
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// danger: uses recursion!
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void NormalProcess::read (const uint32_t offset, const uint32_t size, uint8_t *target)
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{
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if(size == 0) return;
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ssize_t result;
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result = pread(d->memFileHandle, target,size,offset);
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if(result != size)
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{
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if(result == -1)
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{
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cerr << "pread failed: can't read " << size << " bytes at addres " << offset << endl;
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cerr << "errno: " << errno << endl;
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errno = 0;
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}
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else
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{
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read(offset + result, size - result, target + result);
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}
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}
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}
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uint8_t NormalProcess::readByte (const uint32_t offset)
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{
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uint8_t val;
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read(offset, 1, &val);
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return val;
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}
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void NormalProcess::readByte (const uint32_t offset, uint8_t &val )
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{
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read(offset, 1, &val);
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}
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uint16_t NormalProcess::readWord (const uint32_t offset)
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{
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uint16_t val;
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read(offset, 2, (uint8_t *) &val);
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return val;
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}
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void NormalProcess::readWord (const uint32_t offset, uint16_t &val)
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{
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read(offset, 2, (uint8_t *) &val);
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}
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uint32_t NormalProcess::readDWord (const uint32_t offset)
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{
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uint32_t val;
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read(offset, 4, (uint8_t *) &val);
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return val;
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}
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void NormalProcess::readDWord (const uint32_t offset, uint32_t &val)
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{
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read(offset, 4, (uint8_t *) &val);
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}
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/*
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* WRITING
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*/
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void NormalProcess::writeDWord (uint32_t offset, uint32_t data)
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{
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ptrace(PTRACE_POKEDATA,d->my_handle, offset, data);
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}
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// using these is expensive.
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void NormalProcess::writeWord (uint32_t offset, uint16_t data)
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{
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uint32_t orig = readDWord(offset);
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orig &= 0xFFFF0000;
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orig |= data;
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/*
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orig |= 0x0000FFFF;
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orig &= data;
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*/
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ptrace(PTRACE_POKEDATA,d->my_handle, offset, orig);
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}
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void NormalProcess::writeByte (uint32_t offset, uint8_t data)
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{
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uint32_t orig = readDWord(offset);
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orig &= 0xFFFFFF00;
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orig |= data;
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/*
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orig |= 0x000000FF;
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orig &= data;
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*/
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ptrace(PTRACE_POKEDATA,d->my_handle, offset, orig);
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}
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// blah. I hate the kernel devs for crippling /proc/PID/mem. THIS IS RIDICULOUS
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void NormalProcess::write (uint32_t offset, uint32_t size, const uint8_t *source)
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{
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uint32_t indexptr = 0;
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while (size > 0)
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{
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// default: we push 4 bytes
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if(size >= 4)
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{
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writeDWord(offset, *(uint32_t *) (source + indexptr));
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offset +=4;
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indexptr +=4;
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size -=4;
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}
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// last is either three or 2 bytes
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else if(size >= 2)
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{
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writeWord(offset, *(uint16_t *) (source + indexptr));
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offset +=2;
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indexptr +=2;
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size -=2;
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}
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// finishing move
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else if(size == 1)
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{
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writeByte(offset, *(uint8_t *) (source + indexptr));
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return;
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}
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}
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}
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const std::string NormalProcess::readCString (uint32_t offset)
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{
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std::string temp;
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char temp_c[256];
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int counter = 0;
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char r;
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do
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{
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r = readByte(offset+counter);
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temp_c[counter] = r;
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counter++;
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} while (r && counter < 255);
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temp_c[counter] = 0;
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temp = temp_c;
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return temp;
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}
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