static int
fuse_access(const char* path, int mask)
{
PRINTD("##access\n");
return _ERR(_kern_access(path, mask));
}
/*!
Tests if there is an executable file at the provided path. It will
also test if the file has a valid ELF header or is a shell script.
Even if the runtime loader does not need to be able to deal with
both types, the caller will give scripts a proper treatment.
*/
status_t
test_executable(const char *name, char *invoker)
{
char path[B_PATH_NAME_LENGTH];
char buffer[B_FILE_NAME_LENGTH];
// must be large enough to hold the ELF header
status_t status;
ssize_t length;
int fd;
if (name == NULL)
return B_BAD_VALUE;
strlcpy(path, name, sizeof(path));
fd = open_executable(path, B_APP_IMAGE, NULL, NULL, NULL);
if (fd < B_OK)
return fd;
// see if it's executable at all
status = _kern_access(-1, path, X_OK, false);
if (status != B_OK)
goto out;
// read and verify the ELF header
length = _kern_read(fd, 0, buffer, sizeof(buffer));
if (length < 0) {
status = length;
goto out;
}
status = elf_verify_header(buffer, length);
if (status == B_NOT_AN_EXECUTABLE) {
// test for shell scripts
if (!strncmp(buffer, "#!", 2)) {
char *end;
buffer[min_c((size_t)length, sizeof(buffer) - 1)] = '\0';
end = strchr(buffer, '\n');
if (end == NULL) {
status = E2BIG;
goto out;
} else
end[0] = '\0';
if (invoker)
strcpy(invoker, buffer + 2);
status = B_OK;
}
} else if (status == B_OK) {
elf_ehdr *elfHeader = (elf_ehdr *)buffer;
if (elfHeader->e_entry == 0) {
// we don't like to open shared libraries
status = B_NOT_AN_EXECUTABLE;
} else if (invoker)
invoker[0] = '\0';
}
out:
_kern_close(fd);
return status;
}
