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authorStanislaw Halik <sthalik@misaki.pl>2015-11-01 14:06:10 +0100
committerStanislaw Halik <sthalik@misaki.pl>2015-11-01 14:06:21 +0100
commit075d7eee2c5c218451246d0407617ea2bf099274 (patch)
tree2cf86de4c9c6d55f313258b7c51e1facafaa8a24 /opentrack-compat/shm.cpp
parent53fc047667e6e7cf71be13504e003a074b6a83bf (diff)
shm: allow everyone to use the mapping on win32
Issue: #261
Diffstat (limited to 'opentrack-compat/shm.cpp')
-rw-r--r--opentrack-compat/shm.cpp104
1 files changed, 102 insertions, 2 deletions
diff --git a/opentrack-compat/shm.cpp b/opentrack-compat/shm.cpp
index 029a4c95..9eb1b90e 100644
--- a/opentrack-compat/shm.cpp
+++ b/opentrack-compat/shm.cpp
@@ -6,15 +6,115 @@
*/
#include <cstring>
+#include <cstdio>
#include "shm.h"
#if defined(_WIN32)
+
+#include <accctrl.h>
+#include <aclapi.h>
+
+struct secattr
+{
+ bool success;
+ SECURITY_DESCRIPTOR* pSD;
+ SECURITY_ATTRIBUTES attrs;
+ PSID pEveryoneSID;
+ PACL pACL;
+
+ void cleanup()
+ {
+ if (pEveryoneSID)
+ FreeSid(pEveryoneSID);
+ if (pACL)
+ LocalFree(pACL);
+ if (pSD)
+ LocalFree(pSD);
+ success = false;
+ pSD = nullptr;
+ pEveryoneSID = nullptr;
+ pACL = nullptr;
+ }
+
+ secattr() : success(true), pSD(nullptr), pEveryoneSID(nullptr), pACL(nullptr)
+ {
+ SID_IDENTIFIER_AUTHORITY SIDAuthWorld = SECURITY_WORLD_SID_AUTHORITY;
+ EXPLICIT_ACCESS ea;
+
+ if(!AllocateAndInitializeSid(&SIDAuthWorld, 1,
+ SECURITY_WORLD_RID,
+ 0, 0, 0, 0, 0, 0, 0,
+ &pEveryoneSID))
+ {
+ fprintf(stderr, "AllocateAndInitializeSid: %d\n", (int) GetLastError());
+ goto cleanup;
+ }
+
+ memset(&ea, 0, sizeof(ea));
+
+ ea.grfAccessPermissions = KEY_READ;
+ ea.grfAccessMode = SET_ACCESS;
+ ea.grfInheritance = NO_INHERITANCE;
+ ea.Trustee.TrusteeForm = TRUSTEE_IS_SID;
+ ea.Trustee.TrusteeType = TRUSTEE_IS_WELL_KNOWN_GROUP;
+ ea.Trustee.ptstrName = (LPTSTR) pEveryoneSID;
+
+ if (SetEntriesInAcl(1, &ea, NULL, &pACL) != ERROR_SUCCESS)
+ {
+ fprintf(stderr, "SetEntriesInAcl: %d\n", (int) GetLastError());
+ goto cleanup;
+ }
+
+ pSD = (SECURITY_DESCRIPTOR*) LocalAlloc(LPTR, SECURITY_DESCRIPTOR_MIN_LENGTH);
+ if (pSD == nullptr)
+ {
+ fprintf(stderr, "LocalAlloc: %d\n", (int) GetLastError());
+ goto cleanup;
+ }
+
+ if (!InitializeSecurityDescriptor(pSD,
+ SECURITY_DESCRIPTOR_REVISION))
+ {
+ fprintf(stderr, "InitializeSecurityDescriptor: %d\n", (int) GetLastError());
+ goto cleanup;
+ }
+
+ if (!SetSecurityDescriptorDacl(pSD,
+ TRUE,
+ pACL,
+ FALSE))
+ {
+ fprintf(stderr, "SetSecurityDescriptorDacl: %d\n", (int) GetLastError());
+ goto cleanup;
+ }
+
+ attrs.bInheritHandle = false;
+ attrs.lpSecurityDescriptor = pSD;
+ attrs.nLength = sizeof(SECURITY_ATTRIBUTES);
+
+ fprintf(stderr, "security descriptor ok\n");
+ fflush(stderr);
+
+ return;
+cleanup:
+ fflush(stderr);
+ cleanup();
+ }
+
+ ~secattr()
+ {
+ cleanup();
+ }
+};
+
PortableLockedShm::PortableLockedShm(const char* shmName, const char* mutexName, int mapSize)
{
- hMutex = CreateMutexA(NULL, false, mutexName);
+ secattr sa;
+
+ hMutex = CreateMutexA(sa.success ? &sa.attrs : nullptr, false, mutexName);
hMapFile = CreateFileMappingA(
INVALID_HANDLE_VALUE,
- NULL,
+ sa.success ? &sa.attrs : nullptr,
PAGE_READWRITE,
0,
mapSize,