Cool_Tools/lindbergh-loader
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getenv

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This commit is contained in:
dkeruza 2023-12-06 15:15:48 -05:00
parent a460db0076
commit a4b81bdb85
2 changed files with 57 additions and 26 deletions
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82
src/lindbergh/hook.c
View File

@ -43,6 +43,7 @@
int hooks[5] = {-1, -1, -1, -1};
FILE *fileHooks[3] = {NULL, NULL, NULL};
int fileRead[3] = {0, 0, 0};
char envpath[100];
uint32_t elf_crc = 0;
cpuvendor cpu_vendor = {0};
@ -131,13 +132,12 @@ static void handleSegfault(int signal, siginfo_t *info, void *ptr)
}
}
void __attribute__((constructor)) hook_init()
{
printf("SEGA Lindbergh Loader\nRobert Dilley 2022\nNot for public consumption\n\n");
// Get offsets of the Game's ELF and calculate CRC32.
// Get offsets of the Game's ELF and calculate CRC32.
dl_iterate_phdr(callback, NULL);
// Get CPU ID
// Get CPU ID
getCPUID();
// Implement SIGSEGV handler
@ -148,7 +148,7 @@ void __attribute__((constructor)) hook_init()
initConfig();
if(initPatch() != 0)
if (initPatch() != 0)
exit(1);
if (initEeprom() != 0)
@ -178,7 +178,7 @@ void __attribute__((constructor)) hook_init()
securityBoardSetDipResolution(getConfig()->width, getConfig()->height);
printf("Now emulating %s", getGameName());
if(getConfig()->gameStatus == WORKING)
if (getConfig()->gameStatus == WORKING)
{
printf((" - Game is in working state.\n"));
}
@ -290,7 +290,7 @@ FILE *fopen(const char *restrict pathname, const char *restrict mode)
if (strcmp(pathname, "/proc/bus/pci/00/1f.0") == 0)
{
fileRead[PCI_CARD_1F0] = 0;
fileHooks[PCI_CARD_1F0] = _fopen(HOOK_FILE_NAME, mode);
fileHooks[PCI_CARD_1F0] = _fopen(HOOK_FILE_NAME, mode);
return fileHooks[PCI_CARD_1F0];
}
return _fopen(pathname, mode);
@ -334,10 +334,10 @@ FILE *fopen64(const char *pathname, const char *mode)
int fclose(FILE *stream)
{
int (*_fclose)(FILE * stream) = dlsym(RTLD_NEXT, "fclose");
int (*_fclose)(FILE *stream) = dlsym(RTLD_NEXT, "fclose");
for (int i = 0; i < 3; i++)
{
if(fileHooks[i] == stream)
if (fileHooks[i] == stream)
{
int r = _fclose(stream);
fileHooks[i] = NULL;
@ -440,8 +440,8 @@ ssize_t read(int fd, void *buf, size_t count)
size_t fread(void *buf, size_t size, size_t count, FILE *stream)
{
size_t (*_fread)(void *buf, size_t size, size_t count, FILE *stream) = dlsym(RTLD_NEXT, "fread");
if(stream == fileHooks[PCI_CARD_1F0])
if (stream == fileHooks[PCI_CARD_1F0])
{
memcpy(buf, pcidata, 68);
return 68;
@ -610,31 +610,34 @@ int connect(int sockfd, const struct sockaddr *addr, socklen_t addrlen)
/**
* Function to calculate CRC32 checksum in memory.
*/
uint32_t get_crc32(const char *s,size_t n)
*/
uint32_t get_crc32(const char *s, size_t n)
{
uint32_t crc=0xFFFFFFFF;
uint32_t crc = 0xFFFFFFFF;
for(size_t i=0;i<n;i++) {
char ch=s[i];
for(size_t j=0;j<8;j++) {
uint32_t b=(ch^crc)&1;
crc>>=1;
if(b) crc=crc^0xEDB88320;
ch>>=1;
}
for (size_t i = 0; i < n; i++)
{
char ch = s[i];
for (size_t j = 0; j < 8; j++)
{
uint32_t b = (ch ^ crc) & 1;
crc >>= 1;
if (b)
crc = crc ^ 0xEDB88320;
ch >>= 1;
}
}
return ~crc;
}
/**
* Callback function to get the offset and size of the execution program in memory of the ELF we hook to.
*/
static int callback(struct dl_phdr_info *info, size_t size, void *data)
*/
static int callback(struct dl_phdr_info *info, size_t size, void *data)
{
if((info->dlpi_phnum >= 3) && (info->dlpi_phdr[2].p_type == PT_LOAD) && (info->dlpi_phdr[2].p_flags == 5))
if ((info->dlpi_phnum >= 3) && (info->dlpi_phdr[2].p_type == PT_LOAD) && (info->dlpi_phdr[2].p_flags == 5))
{
elf_crc = get_crc32((void *)(info->dlpi_addr + info->dlpi_phdr[2].p_vaddr+10),128);
elf_crc = get_crc32((void *)(info->dlpi_addr + info->dlpi_phdr[2].p_vaddr + 10), 128);
}
return 1;
}
@ -644,7 +647,7 @@ void getCPUID()
unsigned eax;
eax = 0;
__get_cpuid(0, &eax, &cpu_vendor.ebx, &cpu_vendor.ecx, &cpu_vendor.edx);
printf("CPU Vendor: %.4s%.4s%.4s\n", (const char*)&cpu_vendor.ebx,(const char*)&cpu_vendor.edx,(const char*)&cpu_vendor.ecx);
printf("CPU Vendor: %.4s%.4s%.4s\n", (const char *)&cpu_vendor.ebx, (const char *)&cpu_vendor.edx, (const char *)&cpu_vendor.ecx);
}
/**
@ -662,6 +665,33 @@ int setenv(const char *name, const char *value, int overwrite)
return _setenv(name, value, overwrite);
}
/**
* Fake the TEA_DIR environment variable to games that require it to run
*/
char *getenv(const char *name)
{
char *(*_getenv)(const char *name) = dlsym(RTLD_NEXT, "getenv");
if ((strcmp(name, "TEA_DIR") == 0) && getConfig()->game == VT3)
{
if (getcwd(envpath, 100) == NULL)
return "";
char *ptr = strrchr(envpath, '/');
if (ptr == NULL)
return "";
*ptr = '\0';
return envpath;
}
else if (strcmp(name, "TEA_DIR") == 0)
{
if (getcwd(envpath, 100) == NULL)
return "";
return envpath;
}
return _getenv(name);
}
/**
* Stop the game unsetting the DISPLAY environment variable
*/

1
src/lindbergh/patch.c
View File

@ -453,6 +453,7 @@ int initPatch()
detourFunction(0x0831c99e, amDongleUpdate);
detourFunction(0x0831c5d7, amDipswGetData);
detourFunction(0x0831c64f, stub0);
setVariable(0x0827ae1b, 0x34891beb); //Disable Fullscreen
}
break;
default: