/**
* Function to prepare the application directories for the container.
*/
int initialize_app(const char *user, const char *app_id,
const char* nmPrivate_credentials_file,
char* const* local_dirs, char* const* log_roots,
char* const* args) {
if (app_id == NULL || user == NULL) {
fprintf(LOGFILE, "Either app_id is null or the user passed is null.\n");
return INVALID_ARGUMENT_NUMBER;
}
// create the user directory on all disks
int result = initialize_user(user, local_dirs);
if (result != 0) {
return result;
}
////////////// create the log directories for the app on all disks
char* const* log_root;
char *any_one_app_log_dir = NULL;
for(log_root=log_roots; *log_root != NULL; ++log_root) {
char *app_log_dir = get_app_log_directory(*log_root, app_id);
if (app_log_dir == NULL) {
// try the next one
} else if (create_directory_for_user(app_log_dir) != 0) {
free(app_log_dir);
return -1;
} else if (any_one_app_log_dir == NULL) {
any_one_app_log_dir = app_log_dir;
} else {
free(app_log_dir);
}
}
if (any_one_app_log_dir == NULL) {
fprintf(LOGFILE, "Did not create any app-log directories\n");
return -1;
}
free(any_one_app_log_dir);
////////////// End of creating the log directories for the app on all disks
// open up the credentials file
int cred_file = open_file_as_nm(nmPrivate_credentials_file);
if (cred_file == -1) {
return -1;
}
// give up root privs
if (change_user(user_detail->pw_uid, user_detail->pw_gid) != 0) {
return -1;
}
// 750
mode_t permissions = S_IRWXU | S_IRGRP | S_IXGRP;
char* const* nm_root;
char *primary_app_dir = NULL;
for(nm_root=local_dirs; *nm_root != NULL; ++nm_root) {
char *app_dir = get_app_directory(*nm_root, user, app_id);
if (app_dir == NULL) {
// try the next one
} else if (mkdirs(app_dir, permissions) != 0) {
free(app_dir);
} else if (primary_app_dir == NULL) {
primary_app_dir = app_dir;
} else {
free(app_dir);
}
}
if (primary_app_dir == NULL) {
fprintf(LOGFILE, "Did not create any app directories\n");
return -1;
}
char *nmPrivate_credentials_file_copy = strdup(nmPrivate_credentials_file);
// TODO: FIXME. The user's copy of creds should go to a path selected by
// localDirAllocatoir
char *cred_file_name = concatenate("%s/%s", "cred file", 2,
primary_app_dir, basename(nmPrivate_credentials_file_copy));
if (cred_file_name == NULL) {
free(nmPrivate_credentials_file_copy);
return -1;
}
if (copy_file(cred_file, nmPrivate_credentials_file,
cred_file_name, S_IRUSR|S_IWUSR) != 0){
free(nmPrivate_credentials_file_copy);
return -1;
}
free(nmPrivate_credentials_file_copy);
fclose(stdin);
fflush(LOGFILE);
if (LOGFILE != stdout) {
fclose(stdout);
}
if (ERRORFILE != stderr) {
fclose(stderr);
}
if (chdir(primary_app_dir) != 0) {
fprintf(LOGFILE, "Failed to chdir to app dir - %s\n", strerror(errno));
return -1;
}
execvp(args[0], args);
fprintf(ERRORFILE, "Failure to exec app initialization process - %s\n",
strerror(errno));
return -1;
}
int launch_container_as_user(const char *user, const char *app_id,
const char *container_id, const char *work_dir,
const char *script_name, const char *cred_file,
const char* pid_file, char* const* local_dirs,
char* const* log_dirs, const char *resources_key,
char* const* resources_values) {
int exit_code = -1;
char *script_file_dest = NULL;
char *cred_file_dest = NULL;
script_file_dest = get_container_launcher_file(work_dir);
if (script_file_dest == NULL) {
exit_code = OUT_OF_MEMORY;
goto cleanup;
}
cred_file_dest = get_container_credentials_file(work_dir);
if (NULL == cred_file_dest) {
exit_code = OUT_OF_MEMORY;
goto cleanup;
}
// open launch script
int container_file_source = open_file_as_nm(script_name);
if (container_file_source == -1) {
goto cleanup;
}
// open credentials
int cred_file_source = open_file_as_nm(cred_file);
if (cred_file_source == -1) {
goto cleanup;
}
// setsid
pid_t pid = setsid();
if (pid == -1) {
exit_code = SETSID_OPER_FAILED;
goto cleanup;
}
// write pid to pidfile
if (pid_file == NULL
|| write_pid_to_file_as_nm(pid_file, pid) != 0) {
exit_code = WRITE_PIDFILE_FAILED;
goto cleanup;
}
// cgroups-based resource enforcement
if (resources_key != NULL && ! strcmp(resources_key, "cgroups")) {
// write pid to cgroups
char* const* cgroup_ptr;
for (cgroup_ptr = resources_values; cgroup_ptr != NULL &&
*cgroup_ptr != NULL; ++cgroup_ptr) {
if (strcmp(*cgroup_ptr, "none") != 0 &&
write_pid_to_cgroup_as_root(*cgroup_ptr, pid) != 0) {
exit_code = WRITE_CGROUP_FAILED;
goto cleanup;
}
}
}
// give up root privs
if (change_user(user_detail->pw_uid, user_detail->pw_gid) != 0) {
exit_code = SETUID_OPER_FAILED;
goto cleanup;
}
if (create_container_directories(user, app_id, container_id, local_dirs,
log_dirs, work_dir) != 0) {
fprintf(LOGFILE, "Could not create container dirs");
goto cleanup;
}
// 700
if (copy_file(container_file_source, script_name, script_file_dest,S_IRWXU) != 0) {
goto cleanup;
}
// 600
if (copy_file(cred_file_source, cred_file, cred_file_dest,
S_IRUSR | S_IWUSR) != 0) {
goto cleanup;
}
fcloseall();
umask(0027);
if (chdir(work_dir) != 0) {
fprintf(LOGFILE, "Can't change directory to %s -%s\n", work_dir,
strerror(errno));
goto cleanup;
}
if (execlp(script_file_dest, script_file_dest, NULL) != 0) {
fprintf(LOGFILE, "Couldn't execute the container launch file %s - %s",
script_file_dest, strerror(errno));
exit_code = UNABLE_TO_EXECUTE_CONTAINER_SCRIPT;
goto cleanup;
}
exit_code = 0;
cleanup:
free(script_file_dest);
free(cred_file_dest);
return exit_code;
}
int launch_container_as_user(const char *user, const char *app_id,
const char *container_id, const char *work_dir,
const char *script_name, const char *cred_file,
const char* pid_file, char* const* local_dirs,
char* const* log_dirs, const char *resources_key,
char* const* resources_values) {
int exit_code = -1;
char *script_file_dest = NULL;
char *cred_file_dest = NULL;
char *exit_code_file = NULL;
script_file_dest = get_container_launcher_file(work_dir);
if (script_file_dest == NULL) {
exit_code = OUT_OF_MEMORY;
goto cleanup;
}
cred_file_dest = get_container_credentials_file(work_dir);
if (NULL == cred_file_dest) {
exit_code = OUT_OF_MEMORY;
goto cleanup;
}
exit_code_file = get_exit_code_file(pid_file);
if (NULL == exit_code_file) {
exit_code = OUT_OF_MEMORY;
goto cleanup;
}
// open launch script
int container_file_source = open_file_as_nm(script_name);
if (container_file_source == -1) {
goto cleanup;
}
// open credentials
int cred_file_source = open_file_as_nm(cred_file);
if (cred_file_source == -1) {
goto cleanup;
}
pid_t child_pid = fork();
if (child_pid != 0) {
// parent
exit_code = wait_and_write_exit_code(child_pid, exit_code_file);
goto cleanup;
}
// setsid
pid_t pid = setsid();
if (pid == -1) {
exit_code = SETSID_OPER_FAILED;
goto cleanup;
}
// write pid to pidfile
if (pid_file == NULL
|| write_pid_to_file_as_nm(pid_file, pid) != 0) {
exit_code = WRITE_PIDFILE_FAILED;
goto cleanup;
}
// cgroups-based resource enforcement
if (resources_key != NULL && ! strcmp(resources_key, "cgroups")) {
// write pid to cgroups
char* const* cgroup_ptr;
for (cgroup_ptr = resources_values; cgroup_ptr != NULL &&
*cgroup_ptr != NULL; ++cgroup_ptr) {
if (strcmp(*cgroup_ptr, "none") != 0 &&
write_pid_to_cgroup_as_root(*cgroup_ptr, pid) != 0) {
exit_code = WRITE_CGROUP_FAILED;
goto cleanup;
}
}
}
// create the user directory on all disks
int result = initialize_user(user, local_dirs);
if (result != 0) {
return result;
}
// initializing log dirs
int log_create_result = create_log_dirs(app_id, log_dirs);
if (log_create_result != 0) {
return log_create_result;
}
// give up root privs
if (change_user(user_detail->pw_uid, user_detail->pw_gid) != 0) {
exit_code = SETUID_OPER_FAILED;
goto cleanup;
}
// Create container specific directories as user. If there are no resources
// to localize for this container, app-directories and log-directories are
// also created automatically as part of this call.
if (create_container_directories(user, app_id, container_id, local_dirs,
log_dirs, work_dir) != 0) {
fprintf(LOGFILE, "Could not create container dirs");
goto cleanup;
}
// 700
if (copy_file(container_file_source, script_name, script_file_dest,S_IRWXU) != 0) {
goto cleanup;
}
// 600
if (copy_file(cred_file_source, cred_file, cred_file_dest,
S_IRUSR | S_IWUSR) != 0) {
goto cleanup;
}
#if HAVE_FCLOSEALL
fcloseall();
#else
// only those fds are opened assuming no bug
fclose(LOGFILE);
fclose(ERRORFILE);
fclose(stdin);
fclose(stdout);
fclose(stderr);
#endif
umask(0027);
if (chdir(work_dir) != 0) {
fprintf(LOGFILE, "Can't change directory to %s -%s\n", work_dir,
strerror(errno));
goto cleanup;
}
if (execlp(script_file_dest, script_file_dest, NULL) != 0) {
fprintf(LOGFILE, "Couldn't execute the container launch file %s - %s",
script_file_dest, strerror(errno));
exit_code = UNABLE_TO_EXECUTE_CONTAINER_SCRIPT;
goto cleanup;
}
exit_code = 0;
cleanup:
free(exit_code_file);
free(script_file_dest);
free(cred_file_dest);
return exit_code;
}
