DylibSearch::DylibSearch()
: m_reFrameworkPath("/System/Library/Frameworks/([a-zA-Z0-9\\.]+)/Versions/([a-zA-Z0-9\\.]+)/.*"),
m_reDefaultFrameworkPath("/System/Library/Frameworks/([a-zA-Z0-9\\.]+)/([a-zA-Z0-9\\.]+)")
{
try
{
if (__prefix_get() != nullptr)
m_config = new IniConfig(__prefix_translate_path(ETC_DARLING_PATH "/dylib.conf"));
else
m_config = new IniConfig(LIBEXEC_PATH ETC_DARLING_PATH "/dylib.conf");
}
catch (const std::exception& e)
{
std::cerr << e.what() << std::endl;
}
}
std::string DylibSearch::resolveInPathList(std::string name, const std::vector<std::string>& paths)
{
const char* prefix = __prefix_get();
for (const std::string& e : paths)
{
std::string path;
if (prefix)
path = prefix;
path += e + "/" + name;
if (::access(path.c_str(), F_OK) == 0)
return path;
}
return std::string();
}
std::string DylibSearch::resolve(std::string dylib, MachOObject* requester)
{
if (dylib.empty())
return std::string();
// expand @rpath, @executable_path and @loader_path
if (requester != nullptr && dylib[0] == '@')
{
if (dylib.compare(0, 16, "@executable_path") == 0)
{
MachOObject* mainModule = MachOMgr::instance()->mainModule();
if (!mainModule)
throw std::runtime_error("Cannot resolve @executable_path without a main module");
dylib.replace(0, 16, mainModule->directory());
}
else if (dylib.compare(0, 12, "@loader_path") == 0)
{
dylib.replace(0, 12, requester->directory());
}
else if (dylib.compare(0, 6, "@rpath") == 0)
{
return resolveViaRpath(dylib, requester);
}
}
// Search in configuration
if (const char* aliasTarget = resolveAlias(dylib))
{
std::string p;
if (!strchr(aliasTarget, '/'))
{
p = LIB_PATH;
p += '/';
p += aliasTarget;
// std::cout << p << std::endl;
}
return p;
}
// Search in extra paths
std::string epath;
epath = resolveInPathList(dylib, m_extraPaths);
if (!epath.empty())
return epath;
// Search in DYLD_LIBRARY_PATH
epath = resolveInLdPath(dylib);
if (!epath.empty())
return epath;
// Try the path as is
epath = checkPresence(dylib);
if (!epath.empty())
return epath;
// If absolute, search in sysroot
if (dylib[0] == '/')
{
const char* prefix = __prefix_get();
if (!MachOMgr::instance()->sysRoot().empty())
{
std::vector<std::string> roots = string_explode(MachOMgr::instance()->sysRoot(), ':');
for (const std::string& in_path : roots)
{
std::string path;
if (prefix != nullptr)
path = prefix;
path += in_path;
path += '/';
path += dylib;
epath = checkPresence(path);
if (!epath.empty())
return epath;
}
}
if (prefix != nullptr)
{
std::string path = prefix;
path += dylib;
epath = checkPresence(path);
if (!epath.empty())
return epath;
}
}
/*if (MachOMgr::instance()->ignoreMissingDependencies())
{
}*/
return std::string();
}
long sys_execve(char* fname, char** argvp, char** envp)
{
int ret, fd;
char dyld_path[256];
union
{
uint32_t magic;
char magic_array[256];
} m;
// Ideally, if everybody used binfmt_misc to allow direct
// execution of Mach-O binaries under Darling, this wouldn't
// be necessary. But we cannot rely on that.
fd = sys_open(fname, BSD_O_RDONLY, 0);
if (fd < 0)
return fd;
ret = sys_read(fd, m.magic_array, sizeof(m.magic_array));
if (ret < 4)
goto no_macho;
if (__prefix_get() != NULL)
{
// Inject DPREFIX if DPREFIX is missing
int i;
bool has_dprefix = false;
char** new_envp;
for (i = 0; envp[i] != NULL; i++)
{
if (strncmp(envp[i], "DPREFIX=", 8) == 0)
{
has_dprefix = true;
break;
}
}
if (!has_dprefix)
{
char* dprefix;
new_envp = (char**) __builtin_alloca(sizeof(char*) * (i+1));
dprefix = (char*) __builtin_alloca(strlen(__prefix_get()) + 9);
for (i = 0; envp[i] != NULL; i++)
new_envp[i] = envp[i];
strcpy(dprefix, "DPREFIX=");
strcat(dprefix, __prefix_get());
new_envp[i++] = dprefix;
new_envp[i] = NULL;
envp = new_envp;
}
}
if (m.magic == MH_MAGIC || m.magic == MH_CIGAM
|| m.magic == MH_MAGIC_64 || m.magic == MH_CIGAM_64
|| m.magic == FAT_MAGIC || m.magic == FAT_CIGAM)
{
// It is a Mach-O file
int len, i;
char** modargvp;
len = __prefix_get_dyld_path(dyld_path, sizeof(dyld_path)-1);
if (len < 0)
goto no_macho;
// Remove 64 or 32 suffix if present
if (strcmp(&dyld_path[len - 2], "32") == 0
|| strcmp(&dyld_path[len - 2], "64") == 0)
{
dyld_path[len-2] = '\0';
}
// Prepend dyld path
len = 0;
// Count arguments
while (argvp[len++]);
// Allocate a new argvp, execute dyld_path
modargvp = (char**) __builtin_alloca(sizeof(void*) * (len+1));
modargvp[0] = dyld_path;
modargvp[1] = (char*) __prefix_translate_path_link(fname);
for (i = 2; i < len+1; i++)
modargvp[i] = argvp[i-1];
argvp = modargvp;
fname = dyld_path;
}
else if (__prefix_get() != NULL)
{
// shebang handling...
if (m.magic_array[0] == '#' && m.magic_array[1] == '!')
{
char *nl, *interp, *arg;
char** modargvp;
int i, j, len;
nl = memchr(m.magic_array, '\n', sizeof(m.magic_array));
if (nl == NULL)
goto no_macho;
*nl = '\0';
for (i = 2; isspace(m.magic_array[i]); i++);
interp = &m.magic_array[i];
for (i = 0; !isspace(interp[i]) && interp[i]; i++);
if (interp[i] == '\0')
arg = NULL;
else
arg = &interp[i];
if (arg != NULL)
{
*arg = '\0'; // terminate interp
while (isspace(*arg))
arg++;
if (*arg == '\0')
arg = NULL; // no argument, just whitespace
}
// Count original arguments
while (argvp[len++]);
// Allocate a new argvp
modargvp = (char**) __builtin_alloca(sizeof(void*) * (len+2));
i = 0;
modargvp[i++] = interp;
if (arg != NULL)
modargvp[i++] = arg;
modargvp[i] = fname;
// Append original arguments
for (j = 1; j < len+1; j++)
modargvp[i+j] = argvp[j];
argvp = modargvp;
fname = (char*) __prefix_translate_path(modargvp[0]);
}
else
{
fname = (char*) __prefix_translate_path_link(fname);
}
}
no_macho:
sys_close(fd);
ret = LINUX_SYSCALL(__NR_execve, fname, argvp, envp);
if (ret < 0)
ret = errno_linux_to_bsd(ret);
return ret;
}