1 /* 2 * Copyright 2012, Samsung Telecommunications of America 3 * Copyright (C) 2014 The Android Open Source Project 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 * 17 * Written by William Roberts <w.roberts@sta.samsung.com> 18 */ 19 20 #ifndef _LIBAUDIT_H_ 21 #define _LIBAUDIT_H_ 22 23 #include <stdint.h> 24 #include <sys/cdefs.h> 25 #include <sys/socket.h> 26 #include <sys/types.h> 27 28 #include <linux/netlink.h> 29 #include <linux/audit.h> 30 31 __BEGIN_DECLS 32 33 #define MAX_AUDIT_MESSAGE_LENGTH 8970 34 35 typedef enum { 36 GET_REPLY_BLOCKING=0, 37 GET_REPLY_NONBLOCKING 38 } reply_t; 39 40 /* type == AUDIT_SIGNAL_INFO */ 41 struct audit_sig_info { 42 uid_t uid; 43 pid_t pid; 44 char ctx[0]; 45 }; 46 47 struct audit_message { 48 struct nlmsghdr nlh; 49 char data[MAX_AUDIT_MESSAGE_LENGTH]; 50 }; 51 52 /** 53 * Opens a connection to the Audit netlink socket 54 * @return 55 * A valid fd on success or < 0 on error with errno set. 56 * Returns the same errors as man 2 socket. 57 */ 58 extern int audit_open(void); 59 60 /** 61 * Closes the fd returned from audit_open() 62 * @param fd 63 * The fd to close 64 */ 65 extern void audit_close(int fd); 66 67 /** 68 * 69 * @param fd 70 * The fd returned by a call to audit_open() 71 * @param rep 72 * The response struct to store the response in. 73 * @param block 74 * Whether or not to block on IO 75 * @param peek 76 * Whether or not we are to remove the message from 77 * the queue when we do a read on the netlink socket. 78 * @return 79 * This function returns 0 on success, else -errno. 80 */ 81 extern int audit_get_reply(int fd, struct audit_message *rep, reply_t block, 82 int peek); 83 84 /** 85 * Sets a pid to recieve audit netlink events from the kernel 86 * @param fd 87 * The fd returned by a call to audit_open() 88 * @param pid 89 * The pid whom to set as the reciever of audit messages 90 * @return 91 * This function returns 0 on success, -errno on error. 92 */ 93 extern int audit_setup(int fd, uint32_t pid); 94 95 __END_DECLS 96 97 #endif 98