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111 lines
2.9 KiB
111 lines
2.9 KiB
/* |
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* Copyright 2012, Samsung Telecommunications of America |
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* Copyright (C) 2014 The Android Open Source Project |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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* |
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* Written by William Roberts <w.roberts@sta.samsung.com> |
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*/ |
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#ifndef _LIBAUDIT_H_ |
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#define _LIBAUDIT_H_ |
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#include <stdint.h> |
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#include <sys/cdefs.h> |
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#include <sys/socket.h> |
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#include <sys/types.h> |
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#include <linux/audit.h> |
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#include <linux/netlink.h> |
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__BEGIN_DECLS |
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#define MAX_AUDIT_MESSAGE_LENGTH 8970 |
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typedef enum { GET_REPLY_BLOCKING = 0, GET_REPLY_NONBLOCKING } reply_t; |
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/* type == AUDIT_SIGNAL_INFO */ |
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struct audit_sig_info { |
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uid_t uid; |
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pid_t pid; |
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char ctx[0]; |
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}; |
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struct audit_message { |
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struct nlmsghdr nlh; |
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char data[MAX_AUDIT_MESSAGE_LENGTH]; |
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}; |
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/** |
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* Opens a connection to the Audit netlink socket |
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* @return |
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* A valid fd on success or < 0 on error with errno set. |
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* Returns the same errors as man 2 socket. |
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*/ |
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extern int audit_open(void); |
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/** |
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* Closes the fd returned from audit_open() |
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* @param fd |
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* The fd to close |
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*/ |
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extern void audit_close(int fd); |
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/** |
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* |
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* @param fd |
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* The fd returned by a call to audit_open() |
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* @param rep |
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* The response struct to store the response in. |
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* @param block |
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* Whether or not to block on IO |
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* @param peek |
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* Whether or not we are to remove the message from |
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* the queue when we do a read on the netlink socket. |
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* @return |
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* This function returns 0 on success, else -errno. |
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*/ |
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extern int audit_get_reply(int fd, struct audit_message* rep, reply_t block, |
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int peek); |
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/** |
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* Sets a pid to receive audit netlink events from the kernel |
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* @param fd |
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* The fd returned by a call to audit_open() |
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* @param pid |
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* The pid whom to set as the receiver of audit messages |
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* @return |
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* This function returns 0 on success, -errno on error. |
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*/ |
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extern int audit_setup(int fd, pid_t pid); |
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/** |
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* Sets the rate limit to receive audit netlink events from the kernel |
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* @param fd |
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* The fd returned by a call to audit_open() |
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* @param max_rate |
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* The cap of the maximum number of audit messages a second |
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* @return |
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* This function returns 0 on success, -errno on error. |
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*/ |
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/* Guidelines to follow for dynamic rate_limit */ |
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#define AUDIT_RATE_LIMIT_DEFAULT 20 /* acceptable burst rate */ |
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#define AUDIT_RATE_LIMIT_BURST_DURATION 10 /* number of seconds of burst */ |
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#define AUDIT_RATE_LIMIT_MAX 5 /* acceptable sustained rate */ |
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extern int audit_rate_limit(int fd, unsigned rate_limit); |
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__END_DECLS |
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#endif
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