#include <stdarg.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/fcntl.h>
#include <sys/conf.h>
#include <sys/poll.h>
#include <sys/user.h>
#include <sys/signalvar.h>
#include <miscfs/devfs/devfs.h>
#include <bsm/audit.h>
#include <security/audit/audit.h>
#include <security/audit/audit_ioctl.h>
#include <security/audit/audit_bsd.h>
#include <security/audit/audit_private.h>
#if CONFIG_AUDIT
static MALLOC_DEFINE(M_AUDIT_PIPE, "audit_pipe", "Audit pipes");
static MALLOC_DEFINE(M_AUDIT_PIPE_ENTRY, "audit_pipeent",
"Audit pipe entries and buffers");
static MALLOC_DEFINE(M_AUDIT_PIPE_PRESELECT, "audit_pipe_presel",
"Audit pipe preselection structure");
#define AUDIT_PIPE_QLIMIT_DEFAULT (128)
#define AUDIT_PIPE_QLIMIT_MIN (1)
#define AUDIT_PIPE_QLIMIT_MAX (1024)
struct audit_pipe_entry {
void *ape_record;
u_int ape_record_len;
TAILQ_ENTRY(audit_pipe_entry) ape_queue;
};
struct audit_pipe_preselect {
au_id_t app_auid;
au_mask_t app_mask;
TAILQ_ENTRY(audit_pipe_preselect) app_list;
};
#define AUDIT_PIPE_ASYNC 0x00000001
#define AUDIT_PIPE_NBIO 0x00000002
struct audit_pipe {
int ap_open;
u_int ap_flags;
struct selinfo ap_selinfo;
pid_t ap_sigio;
struct mtx ap_mtx;
struct slck ap_sx;
struct cv ap_cv;
u_int ap_qlen;
u_int ap_qlimit;
u_int ap_qbyteslen;
u_int ap_qoffset;
u_int64_t ap_inserts;
u_int64_t ap_reads;
u_int64_t ap_drops;
int ap_preselect_mode;
au_mask_t ap_preselect_flags;
au_mask_t ap_preselect_naflags;
TAILQ_HEAD(, audit_pipe_preselect) ap_preselect_list;
TAILQ_HEAD(, audit_pipe_entry) ap_queue;
TAILQ_ENTRY(audit_pipe) ap_list;
};
#define AUDIT_PIPE_LOCK(ap) mtx_lock(&(ap)->ap_mtx)
#define AUDIT_PIPE_LOCK_ASSERT(ap) mtx_assert(&(ap)->ap_mtx, MA_OWNED)
#define AUDIT_PIPE_LOCK_DESTROY(ap) mtx_destroy(&(ap)->ap_mtx)
#define AUDIT_PIPE_LOCK_INIT(ap) mtx_init(&(ap)->ap_mtx, \
"audit_pipe_mtx", NULL, MTX_DEF)
#define AUDIT_PIPE_UNLOCK(ap) mtx_unlock(&(ap)->ap_mtx)
#define AUDIT_PIPE_MTX(ap) (&(ap)->ap_mtx)
#define AUDIT_PIPE_SX_LOCK_DESTROY(ap) slck_destroy(&(ap)->ap_sx)
#define AUDIT_PIPE_SX_LOCK_INIT(ap) slck_init(&(ap)->ap_sx, "audit_pipe_sx")
#define AUDIT_PIPE_SX_XLOCK_ASSERT(ap) slck_assert(&(ap)->ap_sx, SA_XLOCKED)
#define AUDIT_PIPE_SX_XLOCK_SIG(ap) slck_lock_sig(&(ap)->ap_sx)
#define AUDIT_PIPE_SX_XUNLOCK(ap) slck_unlock(&(ap)->ap_sx)
static TAILQ_HEAD(, audit_pipe) audit_pipe_list;
static struct rwlock audit_pipe_lock;
#define AUDIT_PIPE_LIST_LOCK_INIT() rw_init(&audit_pipe_lock, \
"audit_pipe_list_lock")
#define AUDIT_PIPE_LIST_RLOCK() rw_rlock(&audit_pipe_lock)
#define AUDIT_PIPE_LIST_RUNLOCK() rw_runlock(&audit_pipe_lock)
#define AUDIT_PIPE_LIST_WLOCK() rw_wlock(&audit_pipe_lock)
#define AUDIT_PIPE_LIST_WLOCK_ASSERT() rw_assert(&audit_pipe_lock, \
RA_WLOCKED)
#define AUDIT_PIPE_LIST_WUNLOCK() rw_wunlock(&audit_pipe_lock)
#define AUDIT_PIPE_NAME "auditpipe"
#define MAX_AUDIT_PIPES 32
static int audit_pipe_major;
static struct audit_pipe *audit_pipe_dtab[MAX_AUDIT_PIPES];
static open_close_fcn_t audit_pipe_open;
static open_close_fcn_t audit_pipe_close;
static read_write_fcn_t audit_pipe_read;
static ioctl_fcn_t audit_pipe_ioctl;
static select_fcn_t audit_pipe_poll;
static struct cdevsw audit_pipe_cdevsw = {
.d_open = audit_pipe_open,
.d_close = audit_pipe_close,
.d_read = audit_pipe_read,
.d_write = eno_rdwrt,
.d_ioctl = audit_pipe_ioctl,
.d_stop = eno_stop,
.d_reset = eno_reset,
.d_ttys = NULL,
.d_select = audit_pipe_poll,
.d_mmap = eno_mmap,
.d_strategy = eno_strat,
.d_type = 0
};
static int audit_pipe_count;
static u_int64_t audit_pipe_ever;
static u_int64_t audit_pipe_records;
static u_int64_t audit_pipe_drops;
static void
audit_pipe_entry_free(struct audit_pipe_entry *ape)
{
free(ape->ape_record, M_AUDIT_PIPE_ENTRY);
free(ape, M_AUDIT_PIPE_ENTRY);
}
static struct audit_pipe_preselect *
audit_pipe_preselect_find(struct audit_pipe *ap, au_id_t auid)
{
struct audit_pipe_preselect *app;
AUDIT_PIPE_LOCK_ASSERT(ap);
TAILQ_FOREACH(app, &ap->ap_preselect_list, app_list) {
if (app->app_auid == auid)
return (app);
}
return (NULL);
}
static int
audit_pipe_preselect_get(struct audit_pipe *ap, au_id_t auid,
au_mask_t *maskp)
{
struct audit_pipe_preselect *app;
int error;
AUDIT_PIPE_LOCK(ap);
app = audit_pipe_preselect_find(ap, auid);
if (app != NULL) {
*maskp = app->app_mask;
error = 0;
} else
error = ENOENT;
AUDIT_PIPE_UNLOCK(ap);
return (error);
}
static void
audit_pipe_preselect_set(struct audit_pipe *ap, au_id_t auid, au_mask_t mask)
{
struct audit_pipe_preselect *app, *app_new;
app_new = malloc(sizeof(*app_new), M_AUDIT_PIPE_PRESELECT, M_WAITOK);
AUDIT_PIPE_LOCK(ap);
app = audit_pipe_preselect_find(ap, auid);
if (app == NULL) {
app = app_new;
app_new = NULL;
app->app_auid = auid;
TAILQ_INSERT_TAIL(&ap->ap_preselect_list, app, app_list);
}
app->app_mask = mask;
AUDIT_PIPE_UNLOCK(ap);
if (app_new != NULL)
free(app_new, M_AUDIT_PIPE_PRESELECT);
}
static int
audit_pipe_preselect_delete(struct audit_pipe *ap, au_id_t auid)
{
struct audit_pipe_preselect *app;
int error;
AUDIT_PIPE_LOCK(ap);
app = audit_pipe_preselect_find(ap, auid);
if (app != NULL) {
TAILQ_REMOVE(&ap->ap_preselect_list, app, app_list);
error = 0;
} else
error = ENOENT;
AUDIT_PIPE_UNLOCK(ap);
if (app != NULL)
free(app, M_AUDIT_PIPE_PRESELECT);
return (error);
}
static void
audit_pipe_preselect_flush_locked(struct audit_pipe *ap)
{
struct audit_pipe_preselect *app;
AUDIT_PIPE_LOCK_ASSERT(ap);
while ((app = TAILQ_FIRST(&ap->ap_preselect_list)) != NULL) {
TAILQ_REMOVE(&ap->ap_preselect_list, app, app_list);
free(app, M_AUDIT_PIPE_PRESELECT);
}
}
static void
audit_pipe_preselect_flush(struct audit_pipe *ap)
{
AUDIT_PIPE_LOCK(ap);
audit_pipe_preselect_flush_locked(ap);
AUDIT_PIPE_UNLOCK(ap);
}
static int
audit_pipe_preselect_check(struct audit_pipe *ap, au_id_t auid,
au_event_t event, au_class_t class, int sorf, int trail_preselect)
{
struct audit_pipe_preselect *app;
AUDIT_PIPE_LOCK_ASSERT(ap);
switch (ap->ap_preselect_mode) {
case AUDITPIPE_PRESELECT_MODE_TRAIL:
return (trail_preselect);
case AUDITPIPE_PRESELECT_MODE_LOCAL:
app = audit_pipe_preselect_find(ap, auid);
if (app == NULL) {
if (auid == (uid_t)AU_DEFAUDITID)
return (au_preselect(event, class,
&ap->ap_preselect_naflags, sorf));
else
return (au_preselect(event, class,
&ap->ap_preselect_flags, sorf));
} else
return (au_preselect(event, class, &app->app_mask,
sorf));
default:
panic("audit_pipe_preselect_check: mode %d",
ap->ap_preselect_mode);
}
return (0);
}
int
audit_pipe_preselect(au_id_t auid, au_event_t event, au_class_t class,
int sorf, int trail_preselect)
{
struct audit_pipe *ap;
if (TAILQ_EMPTY(&audit_pipe_list))
return (0);
AUDIT_PIPE_LIST_RLOCK();
TAILQ_FOREACH(ap, &audit_pipe_list, ap_list) {
AUDIT_PIPE_LOCK(ap);
if (audit_pipe_preselect_check(ap, auid, event, class, sorf,
trail_preselect)) {
AUDIT_PIPE_UNLOCK(ap);
AUDIT_PIPE_LIST_RUNLOCK();
return (1);
}
AUDIT_PIPE_UNLOCK(ap);
}
AUDIT_PIPE_LIST_RUNLOCK();
return (0);
}
static void
audit_pipe_append(struct audit_pipe *ap, void *record, u_int record_len)
{
struct audit_pipe_entry *ape;
AUDIT_PIPE_LOCK_ASSERT(ap);
if (ap->ap_qlen >= ap->ap_qlimit) {
ap->ap_drops++;
audit_pipe_drops++;
return;
}
ape = malloc(sizeof(*ape), M_AUDIT_PIPE_ENTRY, M_NOWAIT | M_ZERO);
if (ape == NULL) {
ap->ap_drops++;
audit_pipe_drops++;
return;
}
ape->ape_record = malloc(record_len, M_AUDIT_PIPE_ENTRY, M_NOWAIT);
if (ape->ape_record == NULL) {
free(ape, M_AUDIT_PIPE_ENTRY);
ap->ap_drops++;
audit_pipe_drops++;
return;
}
bcopy(record, ape->ape_record, record_len);
ape->ape_record_len = record_len;
TAILQ_INSERT_TAIL(&ap->ap_queue, ape, ape_queue);
ap->ap_inserts++;
ap->ap_qlen++;
ap->ap_qbyteslen += ape->ape_record_len;
selwakeup(&ap->ap_selinfo);
if (ap->ap_flags & AUDIT_PIPE_ASYNC)
pgsigio(ap->ap_sigio, SIGIO);
#if 0
selwakeuppri(&ap->ap_selinfo, PSOCK);
KNOTE_LOCKED(&ap->ap_selinfo.si_note, 0);
if (ap->ap_flags & AUDIT_PIPE_ASYNC)
pgsigio(&ap->ap_sigio, SIGIO, 0);
#endif
cv_broadcast(&ap->ap_cv);
}
void
audit_pipe_submit(au_id_t auid, au_event_t event, au_class_t class, int sorf,
int trail_select, void *record, u_int record_len)
{
struct audit_pipe *ap;
if (TAILQ_FIRST(&audit_pipe_list) == NULL)
return;
AUDIT_PIPE_LIST_RLOCK();
TAILQ_FOREACH(ap, &audit_pipe_list, ap_list) {
AUDIT_PIPE_LOCK(ap);
if (audit_pipe_preselect_check(ap, auid, event, class, sorf,
trail_select))
audit_pipe_append(ap, record, record_len);
AUDIT_PIPE_UNLOCK(ap);
}
AUDIT_PIPE_LIST_RUNLOCK();
audit_pipe_records++;
}
void
audit_pipe_submit_user(void *record, u_int record_len)
{
struct audit_pipe *ap;
if (TAILQ_FIRST(&audit_pipe_list) == NULL)
return;
AUDIT_PIPE_LIST_RLOCK();
TAILQ_FOREACH(ap, &audit_pipe_list, ap_list) {
AUDIT_PIPE_LOCK(ap);
audit_pipe_append(ap, record, record_len);
AUDIT_PIPE_UNLOCK(ap);
}
AUDIT_PIPE_LIST_RUNLOCK();
audit_pipe_records++;
}
static struct audit_pipe *
audit_pipe_alloc(void)
{
struct audit_pipe *ap;
AUDIT_PIPE_LIST_WLOCK_ASSERT();
ap = malloc(sizeof(*ap), M_AUDIT_PIPE, M_WAITOK | M_ZERO);
if (ap == NULL)
return (NULL);
ap->ap_qlimit = AUDIT_PIPE_QLIMIT_DEFAULT;
TAILQ_INIT(&ap->ap_queue);
#ifndef __APPLE__
knlist_init(&ap->ap_selinfo.si_note, AUDIT_PIPE_MTX(ap), NULL, NULL,
NULL);
#endif
AUDIT_PIPE_LOCK_INIT(ap);
AUDIT_PIPE_SX_LOCK_INIT(ap);
cv_init(&ap->ap_cv, "audit_pipe");
bzero(&ap->ap_preselect_flags, sizeof(ap->ap_preselect_flags));
bzero(&ap->ap_preselect_naflags, sizeof(ap->ap_preselect_naflags));
TAILQ_INIT(&ap->ap_preselect_list);
ap->ap_preselect_mode = AUDITPIPE_PRESELECT_MODE_TRAIL;
TAILQ_INSERT_HEAD(&audit_pipe_list, ap, ap_list);
audit_pipe_count++;
audit_pipe_ever++;
return (ap);
}
static void
audit_pipe_flush(struct audit_pipe *ap)
{
struct audit_pipe_entry *ape;
AUDIT_PIPE_LOCK_ASSERT(ap);
while ((ape = TAILQ_FIRST(&ap->ap_queue)) != NULL) {
TAILQ_REMOVE(&ap->ap_queue, ape, ape_queue);
ap->ap_qbyteslen -= ape->ape_record_len;
audit_pipe_entry_free(ape);
ap->ap_qlen--;
}
ap->ap_qoffset = 0;
KASSERT(ap->ap_qlen == 0, ("audit_pipe_free: ap_qbyteslen"));
KASSERT(ap->ap_qbyteslen == 0, ("audit_pipe_flush: ap_qbyteslen"));
}
static void
audit_pipe_free(struct audit_pipe *ap)
{
AUDIT_PIPE_LIST_WLOCK_ASSERT();
AUDIT_PIPE_LOCK_ASSERT(ap);
audit_pipe_preselect_flush_locked(ap);
audit_pipe_flush(ap);
cv_destroy(&ap->ap_cv);
AUDIT_PIPE_SX_LOCK_DESTROY(ap);
AUDIT_PIPE_UNLOCK(ap);
AUDIT_PIPE_LOCK_DESTROY(ap);
#ifndef __APPLE__
knlist_destroy(&ap->ap_selinfo.si_note);
#endif
TAILQ_REMOVE(&audit_pipe_list, ap, ap_list);
free(ap, M_AUDIT_PIPE);
audit_pipe_count--;
}
static int
audit_pipe_clone(__unused dev_t dev, int action)
{
int i;
if (action == DEVFS_CLONE_ALLOC) {
for(i = 0; i < MAX_AUDIT_PIPES; i++)
if (audit_pipe_dtab[i] == NULL)
return (i);
return (0);
}
return (-1);
}
static int
audit_pipe_open(dev_t dev, __unused int flags, __unused int devtype,
__unused proc_t p)
{
struct audit_pipe *ap;
int u;
u = minor(dev);
if (u < 0 || u > MAX_AUDIT_PIPES)
return (ENXIO);
AUDIT_PIPE_LIST_WLOCK();
ap = audit_pipe_dtab[u];
if (ap == NULL) {
ap = audit_pipe_alloc();
if (ap == NULL) {
AUDIT_PIPE_LIST_WUNLOCK();
return (ENOMEM);
}
audit_pipe_dtab[u] = ap;
} else {
KASSERT(ap->ap_open, ("audit_pipe_open: ap && !ap_open"));
AUDIT_PIPE_LIST_WUNLOCK();
return (EBUSY);
}
ap->ap_open = 1;
AUDIT_PIPE_LIST_WUNLOCK();
#ifndef __APPLE__
fsetown(td->td_proc->p_pid, &ap->ap_sigio);
#endif
return (0);
}
static int
audit_pipe_close(dev_t dev, __unused int flags, __unused int devtype,
__unused proc_t p)
{
struct audit_pipe *ap;
int u;
u = minor(dev);
ap = audit_pipe_dtab[u];
KASSERT(ap != NULL, ("audit_pipe_close: ap == NULL"));
KASSERT(ap->ap_open, ("audit_pipe_close: !ap_open"));
#ifndef __APPLE__
funsetown(&ap->ap_sigio);
#endif
AUDIT_PIPE_LIST_WLOCK();
AUDIT_PIPE_LOCK(ap);
ap->ap_open = 0;
audit_pipe_free(ap);
audit_pipe_dtab[u] = NULL;
AUDIT_PIPE_LIST_WUNLOCK();
return (0);
}
static int
audit_pipe_ioctl(dev_t dev, u_long cmd, caddr_t data,
__unused int flag, __unused proc_t p)
{
struct auditpipe_ioctl_preselect *aip;
struct audit_pipe *ap;
au_mask_t *maskp;
int error, mode;
au_id_t auid;
ap = audit_pipe_dtab[minor(dev)];
KASSERT(ap != NULL, ("audit_pipe_ioctl: ap == NULL"));
switch (cmd) {
case FIONBIO:
AUDIT_PIPE_LOCK(ap);
if (*(int *)data)
ap->ap_flags |= AUDIT_PIPE_NBIO;
else
ap->ap_flags &= ~AUDIT_PIPE_NBIO;
AUDIT_PIPE_UNLOCK(ap);
error = 0;
break;
case FIONREAD:
AUDIT_PIPE_LOCK(ap);
*(int *)data = ap->ap_qbyteslen - ap->ap_qoffset;
AUDIT_PIPE_UNLOCK(ap);
error = 0;
break;
case FIOASYNC:
AUDIT_PIPE_LOCK(ap);
if (*(int *)data)
ap->ap_flags |= AUDIT_PIPE_ASYNC;
else
ap->ap_flags &= ~AUDIT_PIPE_ASYNC;
AUDIT_PIPE_UNLOCK(ap);
error = 0;
break;
#ifndef __APPLE__
case FIOSETOWN:
error = fsetown(*(int *)data, &ap->ap_sigio);
break;
case FIOGETOWN:
*(int *)data = fgetown(&ap->ap_sigio);
error = 0;
break;
#endif
case AUDITPIPE_GET_QLEN:
*(u_int *)data = ap->ap_qlen;
error = 0;
break;
case AUDITPIPE_GET_QLIMIT:
*(u_int *)data = ap->ap_qlimit;
error = 0;
break;
case AUDITPIPE_SET_QLIMIT:
if (*(u_int *)data >= AUDIT_PIPE_QLIMIT_MIN ||
*(u_int *)data <= AUDIT_PIPE_QLIMIT_MAX) {
ap->ap_qlimit = *(u_int *)data;
error = 0;
} else
error = EINVAL;
break;
case AUDITPIPE_GET_QLIMIT_MIN:
*(u_int *)data = AUDIT_PIPE_QLIMIT_MIN;
error = 0;
break;
case AUDITPIPE_GET_QLIMIT_MAX:
*(u_int *)data = AUDIT_PIPE_QLIMIT_MAX;
error = 0;
break;
case AUDITPIPE_GET_PRESELECT_FLAGS:
AUDIT_PIPE_LOCK(ap);
maskp = (au_mask_t *)data;
*maskp = ap->ap_preselect_flags;
AUDIT_PIPE_UNLOCK(ap);
error = 0;
break;
case AUDITPIPE_SET_PRESELECT_FLAGS:
AUDIT_PIPE_LOCK(ap);
maskp = (au_mask_t *)data;
ap->ap_preselect_flags = *maskp;
AUDIT_CHECK_IF_KEVENTS_MASK(ap->ap_preselect_flags);
AUDIT_PIPE_UNLOCK(ap);
error = 0;
break;
case AUDITPIPE_GET_PRESELECT_NAFLAGS:
AUDIT_PIPE_LOCK(ap);
maskp = (au_mask_t *)data;
*maskp = ap->ap_preselect_naflags;
AUDIT_PIPE_UNLOCK(ap);
error = 0;
break;
case AUDITPIPE_SET_PRESELECT_NAFLAGS:
AUDIT_PIPE_LOCK(ap);
maskp = (au_mask_t *)data;
ap->ap_preselect_naflags = *maskp;
AUDIT_CHECK_IF_KEVENTS_MASK(ap->ap_preselect_naflags);
AUDIT_PIPE_UNLOCK(ap);
error = 0;
break;
case AUDITPIPE_GET_PRESELECT_AUID:
aip = (struct auditpipe_ioctl_preselect *)data;
error = audit_pipe_preselect_get(ap, aip->aip_auid,
&aip->aip_mask);
break;
case AUDITPIPE_SET_PRESELECT_AUID:
aip = (struct auditpipe_ioctl_preselect *)data;
audit_pipe_preselect_set(ap, aip->aip_auid, aip->aip_mask);
error = 0;
break;
case AUDITPIPE_DELETE_PRESELECT_AUID:
auid = *(au_id_t *)data;
error = audit_pipe_preselect_delete(ap, auid);
break;
case AUDITPIPE_FLUSH_PRESELECT_AUID:
audit_pipe_preselect_flush(ap);
error = 0;
break;
case AUDITPIPE_GET_PRESELECT_MODE:
AUDIT_PIPE_LOCK(ap);
*(int *)data = ap->ap_preselect_mode;
AUDIT_PIPE_UNLOCK(ap);
error = 0;
break;
case AUDITPIPE_SET_PRESELECT_MODE:
mode = *(int *)data;
switch (mode) {
case AUDITPIPE_PRESELECT_MODE_TRAIL:
case AUDITPIPE_PRESELECT_MODE_LOCAL:
AUDIT_PIPE_LOCK(ap);
ap->ap_preselect_mode = mode;
AUDIT_PIPE_UNLOCK(ap);
error = 0;
break;
default:
error = EINVAL;
}
break;
case AUDITPIPE_FLUSH:
if (AUDIT_PIPE_SX_XLOCK_SIG(ap) != 0)
return (EINTR);
AUDIT_PIPE_LOCK(ap);
audit_pipe_flush(ap);
AUDIT_PIPE_UNLOCK(ap);
AUDIT_PIPE_SX_XUNLOCK(ap);
error = 0;
break;
case AUDITPIPE_GET_MAXAUDITDATA:
*(u_int *)data = MAXAUDITDATA;
error = 0;
break;
case AUDITPIPE_GET_INSERTS:
*(u_int *)data = ap->ap_inserts;
error = 0;
break;
case AUDITPIPE_GET_READS:
*(u_int *)data = ap->ap_reads;
error = 0;
break;
case AUDITPIPE_GET_DROPS:
*(u_int *)data = ap->ap_drops;
error = 0;
break;
case AUDITPIPE_GET_TRUNCATES:
*(u_int *)data = 0;
error = 0;
break;
default:
error = ENOTTY;
}
return (error);
}
static int
audit_pipe_read(dev_t dev, struct uio *uio, __unused int flag)
{
struct audit_pipe_entry *ape;
struct audit_pipe *ap;
u_int toread;
int error;
ap = audit_pipe_dtab[minor(dev)];
KASSERT(ap != NULL, ("audit_pipe_read: ap == NULL"));
if (AUDIT_PIPE_SX_XLOCK_SIG(ap) != 0)
return (EINTR);
AUDIT_PIPE_LOCK(ap);
while (TAILQ_EMPTY(&ap->ap_queue)) {
if (ap->ap_flags & AUDIT_PIPE_NBIO) {
AUDIT_PIPE_UNLOCK(ap);
AUDIT_PIPE_SX_XUNLOCK(ap);
return (EAGAIN);
}
error = cv_wait_sig(&ap->ap_cv, AUDIT_PIPE_MTX(ap));
if (error) {
AUDIT_PIPE_UNLOCK(ap);
AUDIT_PIPE_SX_XUNLOCK(ap);
return (error);
}
}
ap->ap_reads++;
while ((ape = TAILQ_FIRST(&ap->ap_queue)) != NULL &&
uio_resid(uio) > 0) {
AUDIT_PIPE_LOCK_ASSERT(ap);
KASSERT(ape->ape_record_len > ap->ap_qoffset,
("audit_pipe_read: record_len > qoffset (1)"));
toread = MIN((int)(ape->ape_record_len - ap->ap_qoffset),
uio_resid(uio));
AUDIT_PIPE_UNLOCK(ap);
error = uiomove((char *)ape->ape_record + ap->ap_qoffset,
toread, uio);
if (error) {
AUDIT_PIPE_SX_XUNLOCK(ap);
return (error);
}
AUDIT_PIPE_LOCK(ap);
KASSERT(TAILQ_FIRST(&ap->ap_queue) == ape,
("audit_pipe_read: queue out of sync after uiomove"));
ap->ap_qoffset += toread;
KASSERT(ape->ape_record_len >= ap->ap_qoffset,
("audit_pipe_read: record_len >= qoffset (2)"));
if (ap->ap_qoffset == ape->ape_record_len) {
TAILQ_REMOVE(&ap->ap_queue, ape, ape_queue);
ap->ap_qbyteslen -= ape->ape_record_len;
audit_pipe_entry_free(ape);
ap->ap_qlen--;
ap->ap_qoffset = 0;
}
}
AUDIT_PIPE_UNLOCK(ap);
AUDIT_PIPE_SX_XUNLOCK(ap);
return (0);
}
static int
audit_pipe_poll(dev_t dev, int events, void *wql, struct proc *p)
{
struct audit_pipe *ap;
int revents;
revents = 0;
ap = audit_pipe_dtab[minor(dev)];
KASSERT(ap != NULL, ("audit_pipe_poll: ap == NULL"));
if (events & (POLLIN | POLLRDNORM)) {
AUDIT_PIPE_LOCK(ap);
if (TAILQ_FIRST(&ap->ap_queue) != NULL)
revents |= events & (POLLIN | POLLRDNORM);
else
selrecord(p, &ap->ap_selinfo, wql);
AUDIT_PIPE_UNLOCK(ap);
}
return (revents);
}
#ifndef __APPLE__
static int
audit_pipe_kqread(struct knote *kn, long hint)
{
struct audit_pipe *ap;
ap = (struct audit_pipe *)kn->kn_hook;
KASSERT(ap != NULL, ("audit_pipe_kqread: ap == NULL"));
AUDIT_PIPE_LOCK_ASSERT(ap);
if (ap->ap_qlen != 0) {
kn->kn_data = ap->ap_qbyteslen - ap->ap_qoffset;
return (1);
} else {
kn->kn_data = 0;
return (0);
}
}
static void
audit_pipe_kqdetach(struct knote *kn)
{
struct audit_pipe *ap;
ap = (struct audit_pipe *)kn->kn_hook;
KASSERT(ap != NULL, ("audit_pipe_kqdetach: ap == NULL"));
AUDIT_PIPE_LOCK(ap);
knlist_remove(&ap->ap_selinfo.si_note, kn, 1);
AUDIT_PIPE_UNLOCK(ap);
}
#endif
static void *devnode;
int
audit_pipe_init(void)
{
dev_t dev;
TAILQ_INIT(&audit_pipe_list);
AUDIT_PIPE_LIST_LOCK_INIT();
audit_pipe_major = cdevsw_add(-1, &audit_pipe_cdevsw);
if (audit_pipe_major < 0)
return (KERN_FAILURE);
dev = makedev(audit_pipe_major, 0);
devnode = devfs_make_node_clone(dev, DEVFS_CHAR, UID_ROOT, GID_WHEEL,
0600, audit_pipe_clone, "auditpipe", 0);
if (devnode == NULL)
return (KERN_FAILURE);
return (KERN_SUCCESS);
}
int
audit_pipe_shutdown(void)
{
devfs_remove(devnode);
(void) cdevsw_remove(audit_pipe_major, &audit_pipe_cdevsw);
return (KERN_SUCCESS);
}
#endif