pii-socket.c

/**
 * Copyright © 2016 IBM Corporation
 * Copyright © 2025 Google
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "console-server.h"

#include <err.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/types.h>
#include <unistd.h>

#define CONSOLE_PII_PREFIX_MACHINE "obmc-console-pii-machine"
#define CONSOLE_PII_PREFIX_USER	   "obmc-console-pii-user"

/* Build the socket path. */
ssize_t console_pii_socket_path(socket_path_t sun_path, const char *id,
				enum pii_data_t pii_data)
{
	int rc;
	const char *path_template;

	if (!id) {
		errno = EINVAL;
		return -1;
	}

	switch (pii_data) {
	case PII_DATA_MACHINE:
		path_template = CONSOLE_PII_PREFIX_MACHINE ".%s";
		break;
	case PII_DATA_USER:
		path_template = CONSOLE_PII_PREFIX_USER ".%s";
		break;
	default:
		errno = EINVAL;
		return -1;
	}
	rc = snprintf(sun_path + 1, sizeof(socket_path_t) - 1, path_template,
		      id);
	if (rc < 0) {
		return rc;
	}

	if ((size_t)rc > (sizeof(socket_path_t) - 1)) {
		errno = ENOSPC;
		return -1;
	}

	return rc + 1 /* Capture NUL prefix */;
}