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/*
clsync - file tree sync utility based on inotify/kqueue
Copyright (C) 2013-2014 Dmitry Yu Okunev <dyokunev@ut.mephi.ru> 0x8E30679C
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "common.h"
#include "error.h"
#include "sync.h"
#include "indexes.h"
#include "privileged.h"
#include "mon_inotify.h"
enum event_bits {
UEM_DIR = 0x01,
UEM_CREATED = 0x02,
UEM_DELETED = 0x04,
};
struct recognize_event_return {
eventobjtype_t objtype_old;
eventobjtype_t objtype_new;
};
static inline void recognize_event ( struct recognize_event_return *r, uint32_t event )
{
eventobjtype_t type;
int is_created;
int is_deleted;
type = ( event & IN_ISDIR ? EOT_DIR : EOT_FILE );
is_created = event & ( IN_CREATE | IN_MOVED_TO );
is_deleted = event & ( IN_DELETE_SELF | IN_DELETE | IN_MOVED_FROM );
debug ( 4, "type == %x; is_created == %x; is_deleted == %x", type, is_created, is_deleted );
r->objtype_old = ( is_created ? EOT_DOESNTEXIST : type );
r->objtype_new = ( is_deleted ? EOT_DOESNTEXIST : type );
return;
}
int inotify_add_watch_dir ( ctx_t *ctx_p, indexes_t *indexes_p, const char *const accpath )
{
( void ) indexes_p;
int inotify_d = ( int ) ( long ) ctx_p->fsmondata;
return privileged_inotify_add_watch ( inotify_d, accpath, INOTIFY_MARKMASK, PC_INOTIFY_ADD_WATCH_DIR );
}
int inotify_wait ( ctx_t *ctx_p, struct indexes *indexes_p, struct timeval *tv_p )
{
( void ) indexes_p;
int inotify_d = ( int ) ( long ) ctx_p->fsmondata;
debug ( 3, "select with timeout %li secs (fd == %u).", tv_p->tv_sec, inotify_d );
fd_set rfds;
FD_ZERO ( &rfds );
FD_SET ( inotify_d, &rfds );
return select ( inotify_d + 1, &rfds, NULL, NULL, tv_p );
}
#define INOTIFY_HANDLE_CONTINUE {\
ptr += sizeof(struct inotify_event) + event->len;\
count++;\
continue;\
}
int inotify_handle ( ctx_t *ctx_p, indexes_t *indexes_p )
{
static struct timeval tv = {0};
int inotify_d = ( int ) ( long ) ctx_p->fsmondata;
int count = 0;
fd_set rfds;
FD_ZERO ( &rfds );
FD_SET ( inotify_d, &rfds );
char *path_rel = NULL;
size_t path_rel_len = 0;
char *path_full = NULL;
size_t path_full_size = 0;
while ( select ( FD_SETSIZE, &rfds, NULL, NULL, &tv ) ) {
char buf[BUFSIZ + 1];
size_t r = read ( inotify_d, buf, BUFSIZ );
if ( r <= 0 ) {
error ( "Got error while reading events from inotify with read()." );
count = -1;
goto l_inotify_handle_end;
}
#ifdef PARANOID
g_hash_table_remove_all ( indexes_p->fpath2ei_ht );
#endif
char *ptr = buf;
char *end = &buf[r];
while ( ptr < end ) {
struct inotify_event *event = ( struct inotify_event * ) ptr;
// Removing stale wd-s
if ( event->mask & IN_IGNORED ) {
debug ( 2, "Cleaning up info about watch descriptor %i.", event->wd );
indexes_remove_bywd ( indexes_p, event->wd );
INOTIFY_HANDLE_CONTINUE;
}
// Getting path
char *fpath = indexes_wd2fpath ( indexes_p, event->wd );
if ( fpath == NULL ) {
debug ( 2, "Event %p on stale watch (wd: %i).", ( void * ) ( long ) event->mask, event->wd );
INOTIFY_HANDLE_CONTINUE;
}
debug ( 2, "Event %p on \"%s\" (wd: %i; fpath: \"%s\").", ( void * ) ( long ) event->mask, event->len > 0 ? event->name : "", event->wd, fpath );
// Getting full path
size_t path_full_memreq = strlen ( fpath ) + event->len + 2;
if ( path_full_size < path_full_memreq ) {
path_full = xrealloc ( path_full, path_full_memreq );
path_full_size = path_full_memreq;
}
if ( event->len > 0 )
sprintf ( path_full, "%s/%s", fpath, event->name );
else
sprintf ( path_full, "%s", fpath );
// Getting infomation about file/dir/etc
struct recognize_event_return r = {0};
recognize_event ( &r, event->mask );
stat64_t lst, *lst_p;
mode_t st_mode;
size_t st_size;
if ( ( r.objtype_new == EOT_DOESNTEXIST ) || ( ctx_p->flags[CANCEL_SYSCALLS]&CSC_MON_STAT ) || privileged_lstat64 ( path_full, &lst, PC_MON_HANDLE_LSTAT64 ) ) {
debug ( 2, "Cannot lstat64(\"%s\", lst). Seems, that the object had been deleted (%i) or option \"--cancel-syscalls mon_stat\" (%i) is set.", path_full, r.objtype_new == EOT_DOESNTEXIST, ctx_p->flags[CANCEL_SYSCALLS]&CSC_MON_STAT );
st_mode = ( event->mask & IN_ISDIR ? S_IFDIR : S_IFREG );
st_size = 0;
lst_p = NULL;
} else {
st_mode = lst.st_mode;
st_size = lst.st_size;
lst_p = &lst;
}
if ( sync_prequeue_loadmark ( 1, ctx_p, indexes_p, path_full, NULL, lst_p, r.objtype_old, r.objtype_new, event->mask, event->wd, st_mode, st_size, &path_rel, &path_rel_len, NULL ) ) {
count = -1;
goto l_inotify_handle_end;
}
INOTIFY_HANDLE_CONTINUE;
}
// Globally queueing captured events:
// Moving events from local queue to global ones
sync_prequeue_unload ( ctx_p, indexes_p );
}
l_inotify_handle_end:
if ( path_full != NULL )
free ( path_full );
if ( path_rel != NULL )
free ( path_rel );
return count;
}
int inotify_deinit ( ctx_t *ctx_p )
{
int inotify_d = ( int ) ( long ) ctx_p->fsmondata;
debug ( 3, "Closing inotify_d" );
return close ( inotify_d );
}
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