412 lines
10 KiB
C++
412 lines
10 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 "Internal.h"
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#include "SHMProcess.h"
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#include "dfhack/VersionInfo.h"
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#include "dfhack/DFError.h"
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#include <errno.h>
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#include <sys/shm.h>
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#include <sys/types.h>
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#include <sys/ipc.h>
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#include <time.h>
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#include <shms.h>
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#include <mod-core.h>
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#include <sys/time.h>
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#include <time.h>
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#include <sched.h>
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using namespace DFHack;
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SHMProcess::Private::Private(SHMProcess * self_)
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{
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memdescriptor = NULL;
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process_ID = 0;
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shm_ID = -1;
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attached = false;
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identified = false;
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useYield = false;
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server_lock = -1;
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client_lock = -1;
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suspend_lock = -1;
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locked = false;
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self = self_;
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}
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bool SHMProcess::Private::SetAndWait (uint32_t state)
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{
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uint32_t cnt = 0;
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if(!attached) return false;
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SHMCMD = state;
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while (SHMCMD == state)
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{
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// yield the CPU, only on single-core CPUs
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if(useYield)
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{
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SCHED_YIELD
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}
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if(cnt == 10000)
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{
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if(!AreLocksOk())// DF not there anymore?
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{
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//detach the shared memory
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shmdt(shm_addr);
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FreeLocks();
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attached = locked = identified = false;
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// we aren't the current process anymore
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throw Error::SHMServerDisappeared();
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}
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else
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{
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cnt = 0;
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}
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}
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cnt++;
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}
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// server returned a generic error
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if(SHMCMD == CORE_ERROR)
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{
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return false;
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}
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return true;
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}
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/*
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Yeah. with no way to synchronize things (locks are slow, the OS doesn't give us
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enough control over scheduling)
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we end up with this silly thing
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*/
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bool SHMProcess::SetAndWait (uint32_t state)
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{
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return d->SetAndWait(state);
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}
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uint32_t OS_getAffinity()
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{
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cpu_set_t mask;
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sched_getaffinity(0,sizeof(cpu_set_t),&mask);
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// FIXME: truncation
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uint32_t affinity = *(uint32_t *) &mask;
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return affinity;
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}
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void SHMProcess::Private::FreeLocks()
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{
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attachmentIdx = -1;
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if(client_lock != -1)
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{
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lockf(client_lock,F_ULOCK,0);
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close(client_lock);
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client_lock = -1;
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}
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if(server_lock != -1)
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{
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close(server_lock);
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server_lock = -1;
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}
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if(suspend_lock != -1)
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{
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close(suspend_lock);
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locked = false;
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suspend_lock = -1;
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}
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}
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bool SHMProcess::Private::GetLocks()
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{
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char name[256];
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// try to acquire locks
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// look at the server lock, if it's locked, the server is present
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sprintf(name, "/tmp/DFHack/%d/SVlock",process_ID);
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server_lock = open(name,O_WRONLY);
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if(server_lock == -1)
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{
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// cerr << "can't open sv lock" << endl;
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return false;
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}
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if(lockf( server_lock, F_TEST, 0 ) != -1)
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{
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cerr << "sv lock not locked" << endl;
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close(server_lock);
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server_lock = -1;
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return false;
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}
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for(int i = 0; i < SHM_MAX_CLIENTS; i++)
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{
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// open the client suspend locked
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sprintf(name, "/tmp/DFHack/%d/CLSlock%d",process_ID,i);
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suspend_lock = open(name,O_WRONLY);
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if(suspend_lock == -1)
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{
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cerr << "can't open cl S-lock " << i << endl;
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// couldn't open lock
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continue;
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}
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// open the client lock, try to lock it
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sprintf(name, "/tmp/DFHack/%d/CLlock%d",process_ID,i);
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client_lock = open(name,O_WRONLY);
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if(client_lock == -1)
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{
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cerr << "can't open cl lock " << i << endl;
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close(suspend_lock);
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locked = false;
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suspend_lock = -1;
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// couldn't open lock
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continue;
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}
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if(lockf(client_lock,F_TLOCK, 0) == -1)
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{
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// couldn't acquire lock
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cerr << "can't acquire cl lock " << i << endl;
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close(suspend_lock);
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locked = false;
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suspend_lock = -1;
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close(client_lock);
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client_lock = -1;
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continue;
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}
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// ok, we have all the locks we need!
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attachmentIdx = i;
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return true;
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}
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close(server_lock);
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server_lock = -1;
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cerr << "can't get any client locks" << endl;
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return false;
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}
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// test if we have client and server locks and the server is present
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bool SHMProcess::Private::AreLocksOk()
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{
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// both locks are inited (we hold our lock)
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if(client_lock != -1 && server_lock != -1)
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{
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if(lockf(server_lock,F_TEST,0) == -1) // and server holds its lock
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{
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return true; // OK, locks are good
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}
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}
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// locks are bad
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return false;
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}
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bool SHMProcess::Private::validate(vector <VersionInfo *> & known_versions)
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{
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char exe_link_name [256];
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char target_name[1024];
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int target_result;
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// find the binary
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sprintf(exe_link_name,"/proc/%d/exe", process_ID);
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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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perror("readlink");
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return false;
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}
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// make sure we have a null terminated string...
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// see http://www.opengroup.org/onlinepubs/000095399/functions/readlink.html
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target_name[target_result] = 0;
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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(target_name);
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vector<VersionInfo *>::iterator it;
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// cerr << exe_file << " " << hash << endl;
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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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try{
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if(hash == (*it)->getMD5()) // are the md5 hashes the same?
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{
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VersionInfo *m = new VersionInfo(**it);
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memdescriptor = m;
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m->setParentProcess(self);
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identified = true;
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// cerr << "identified " << m->getVersion() << endl;
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return true;
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}
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}
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catch (Error::AllMemdef&)
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{
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continue;
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}
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}
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return false;
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}
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// there is only one we care about.
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bool SHMProcess::getThreadIDs(vector<uint32_t> & threads )
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{
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if(d->attached)
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{
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threads.clear();
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threads.push_back(d->process_ID);
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return true;
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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 SHMProcess::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->process_ID);
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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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temp.valid = true;
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ranges.push_back(temp);
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}
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}
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bool SHMProcess::acquireSuspendLock()
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{
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return (lockf(d->suspend_lock,F_LOCK,0) == 0);
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}
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bool SHMProcess::releaseSuspendLock()
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{
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return (lockf(d->suspend_lock,F_ULOCK,0) == 0);
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}
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bool SHMProcess::attach()
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{
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if(d->attached)
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{
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if(!d->locked)
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return suspend();
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return true;
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}
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//cerr << "attach" << endl;// FIXME: throw
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if(!d->GetLocks())
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{
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//cerr << "server is full or not really there!" << endl;
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return false;
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}
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/*
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* Locate the segment.
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*/
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if ((d->shm_ID = shmget(SHM_KEY + d->process_ID, SHM_SIZE, 0666)) < 0)
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{
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d->FreeLocks();
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cerr << "can't find segment" << endl; // FIXME: throw
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return false;
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}
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/*
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* Attach the segment
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*/
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if ((d->shm_addr = (char *) shmat(d->shm_ID, NULL, 0)) == (char *) -1)
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{
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d->FreeLocks();
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cerr << "can't attach segment" << endl; // FIXME: throw
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return false;
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}
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d->attached = true;
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if(!suspend())
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{
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shmdt(d->shm_addr);
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d->FreeLocks();
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cerr << "unable to suspend" << endl;
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return false;
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}
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return true;
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}
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bool SHMProcess::detach()
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{
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if(!d->attached) return true;
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if(d->locked)
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{
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resume();
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}
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// detach segment
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if(shmdt(d->shm_addr) != -1)
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{
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d->FreeLocks();
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d->locked = false;
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d->attached = false;
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d->shm_addr = 0;
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return true;
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}
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// fail if we can't detach
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// FIXME: throw exception here??
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perror("failed to detach shared segment");
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return false;
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}
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string SHMProcess::readClassName (uint32_t vptr)
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{
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if(!d->locked) throw Error::MemoryAccessDenied();
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int typeinfo = Process::readDWord(vptr - 0x4);
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int typestring = Process::readDWord(typeinfo + 0x4);
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string raw = readCString(typestring);
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size_t start = raw.find_first_of("abcdefghijklmnopqrstuvwxyz");// trim numbers
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size_t end = raw.length();
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return raw.substr(start,end-start);
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}
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string SHMProcess::getPath()
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{
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char cwd_name[256];
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char target_name[1024];
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int target_result;
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sprintf(cwd_name,"/proc/%d/cwd", getPID());
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// resolve /proc/PID/exe link
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target_result = readlink(cwd_name, target_name, sizeof(target_name));
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target_name[target_result] = '\0';
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return(string(target_name));
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}
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char * SHMProcess::getSHMStart (void)
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{
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if(!d->locked) return 0; //THROW HERE!
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return d->shm_addr;
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}
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