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aupipe.c
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aupipe.c
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/*-
* xnumon - monitor macOS for malicious activity
* https://www.roe.ch/xnumon
*
* Copyright (c) 2017-2019, Daniel Roethlisberger <daniel@roe.ch>.
* All rights reserved.
*
* Licensed under the Open Software License version 3.0.
*/
#include "aupipe.h"
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/fcntl.h>
#include <sys/ioctl.h>
#include <bsm/libbsm.h>
#include <security/audit/audit_ioctl.h>
static int
aupipe_config(int fd, unsigned int classmask) {
int i;
unsigned int ui;
i = AUDITPIPE_PRESELECT_MODE_LOCAL;
if (ioctl(fd, AUDITPIPE_SET_PRESELECT_MODE, &i) == -1) {
fprintf(stderr, "ioctl(AUDITPIPE_SET_PRESELECT_MODE, "
"AUDITPIPE_PRESELECT_MODE_LOCAL): "
"%s (%i)\n",
strerror(errno), errno);
return -1;
}
if (ioctl(fd, AUDITPIPE_GET_QLIMIT_MAX, &i) == -1) {
fprintf(stderr, "ioctl(AUDITPIPE_GET_QLIMIT_MAX): "
"%s (%i)\n",
strerror(errno), errno);
return -1;
}
if (ioctl(fd, AUDITPIPE_SET_QLIMIT, &i) == -1) {
fprintf(stderr, "ioctl(AUDITPIPE_SET_QLIMIT, %i): "
"%s (%i)\n",
i, strerror(errno), errno);
return -1;
}
ui = classmask;
if (ioctl(fd, AUDITPIPE_SET_PRESELECT_FLAGS, &ui) == -1) {
fprintf(stderr, "ioctl(AUDITPIPE_SET_PRESELECT_FLAGS, "
"0x%08x): %s (%i)\n",
ui, strerror(errno), errno);
return -1;
}
ui = classmask;
if (ioctl(fd, AUDITPIPE_SET_PRESELECT_NAFLAGS, &ui) == -1) {
fprintf(stderr, "ioctl(AUDITPIPE_SET_PRESELECT_NAFLAGS, "
"0x%08x): %s (%i)\n",
ui, strerror(errno), errno);
return -1;
}
if (ioctl(fd, AUDITPIPE_FLUSH) == -1) {
fprintf(stderr, "ioctl(AUDITPIPE_FLUSH): %s (%i)\n",
strerror(errno), errno);
return -1;
}
return 0;
}
FILE *
aupipe_fopen(unsigned int classmask) {
FILE *f;
int fd;
if ((f = fopen("/dev/auditpipe", "r")) == NULL) {
fprintf(stderr, "fopen(/dev/auditpipe): %s (%i)\n",
strerror(errno), errno);
return NULL;
}
if ((fd = fileno(f)) == -1) {
fprintf(stderr, "fileno(f): %s (%i)\n",
strerror(errno), errno);
return NULL;
}
if (aupipe_config(fd, classmask) == -1) {
fclose(f);
return NULL;
}
return f;
}
int
aupipe_open(unsigned int classmask) {
int fd;
if ((fd = open("/dev/auditpipe", O_RDONLY)) == -1) {
fprintf(stderr, "open(/dev/auditpipe): %s (%i)\n",
strerror(errno), errno);
return -1;
}
if (aupipe_config(fd, classmask) == -1) {
close(fd);
return -1;
}
return fd;
}
void
aupipe_stats(int fd, aupipe_stat_t *st) {
if (ioctl(fd, AUDITPIPE_GET_QLEN, &st->qlen) == -1) {
st->qlen = 0;
}
if (ioctl(fd, AUDITPIPE_GET_QLIMIT, &st->qlimit) == -1) {
st->qlimit = 0;
}
if (ioctl(fd, AUDITPIPE_GET_INSERTS, &st->inserts) == -1) {
st->inserts = 0;
}
if (ioctl(fd, AUDITPIPE_GET_READS, &st->reads) == -1) {
st->reads = 0;
}
if (ioctl(fd, AUDITPIPE_GET_DROPS, &st->drops) == -1) {
st->drops = 0;
}
}