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authorSamba Release Account <samba-bugs@samba.org>1996-12-10 18:03:44 +0000
committerSamba Release Account <samba-bugs@samba.org>1996-12-10 18:03:44 +0000
commit9654c572fdb9a38a964f2c5cc257c7a6d771fe8a (patch)
tree7bd51c1c43764a66b3cbae64a413700f936056dd /source3/lib
parent9db489ea558598d1d0cd9b9d9f131ec02e3f7fc6 (diff)
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Added Whistle veto file functions. Moved fcntl locking from
locking.c to util.c jra@cygnus.com (This used to be commit f2d481a2d3a9adca7c94427f291a379958c3c0da)
Diffstat (limited to 'source3/lib')
-rw-r--r--source3/lib/util.c225
1 files changed, 225 insertions, 0 deletions
diff --git a/source3/lib/util.c b/source3/lib/util.c
index 63dda489d4..8730ae3143 100644
--- a/source3/lib/util.c
+++ b/source3/lib/util.c
@@ -3394,4 +3394,229 @@ char *readdirname(void *p)
}
+BOOL is_vetoed_name(char *name)
+{
+ char *namelist = lp_veto_files();
+ char *nameptr = namelist;
+ char *name_end;
+
+ /* if we have no list it's obviously not vetoed */
+ if((nameptr == NULL ) || (*nameptr == '\0'))
+ return 0;
+
+ /* if the name doesn't exist in the list, it's obviously ok too */
+ if(strstr(namelist,name) == NULL )
+ return 0;
+
+ /* now, we need to find the names one by one and check them
+ they can contain spaces and all sorts of stuff so we
+ separate them with of all things '/' which can never be in a filename
+ I could use "" but then I have to break them all out
+ maybe such a routine exists somewhere?
+ */
+ while(*nameptr)
+ {
+ if ( *nameptr == '/' )
+ {
+ nameptr++;
+ continue;
+ }
+ if(name_end = strchr(nameptr,'/'))
+ {
+ *name_end = 0;
+ }
+ /* a match! it's veto'd */
+ if(strcmp(name,nameptr) == 0)
+ return 1;
+ if(name_end == NULL)
+ return 0;
+ /* next segment please */
+ nameptr = name_end + 1;
+ }
+ return 0;
+}
+
+BOOL is_vetoed_path(char *name)
+{
+ char *namelist = lp_veto_files();
+ char *nameptr = namelist;
+ char *sub;
+ char *name_end;
+ int len;
+
+ /* if we have no list it's obviously not vetoed */
+ if((nameptr == NULL ) || (*nameptr == '\0'))
+ return 0;
+
+
+ /* now, we need to find the names one by one and check them
+ they can contain spaces and all sorts of stuff so we
+ separate them with of all things '/' which can never be in a filename
+ I could use "" but then I have to break them all out
+ maybe such a routine exists somewhere?
+ */
+ while(*nameptr)
+ {
+ if ( *nameptr == '/' )
+ {
+ nameptr++;
+ continue;
+ }
+ if(name_end = strchr(nameptr,'/'))
+ {
+ *name_end = 0;
+ }
+
+ len = strlen(nameptr);
+ sub = name;
+ /* If the name doesn't exist in the path, try the next name.. */
+ while( sub && ((sub = strstr(sub,nameptr)) != NULL))
+ {
+ /* Is it a whole component? */
+ if(((sub == name) || (sub[-1] == '/'))
+ && ((sub[len] == '\0') || (sub[len] == '/')))
+ {
+ return 1;
+ }
+ /* skip to the next component of the path */
+ sub =strchr(sub,'/');
+ }
+ if(name_end == NULL)
+ return 0;
+ /* next segment please */
+ nameptr = name_end + 1;
+ }
+ return 0;
+}
+
+/****************************************************************************
+routine to do file locking
+****************************************************************************/
+BOOL fcntl_lock(int fd,int op,uint32 offset,uint32 count,int type)
+{
+#if HAVE_FCNTL_LOCK
+ struct flock lock;
+ int ret;
+
+#if 1
+ uint32 mask = 0xC0000000;
+
+ /* make sure the count is reasonable, we might kill the lockd otherwise */
+ count &= ~mask;
+
+ /* the offset is often strange - remove 2 of its bits if either of
+ the top two bits are set. Shift the top ones by two bits. This
+ still allows OLE2 apps to operate, but should stop lockd from
+ dieing */
+ if ((offset & mask) != 0)
+ offset = (offset & ~mask) | ((offset & mask) >> 2);
+#else
+ uint32 mask = ((unsigned)1<<31);
+
+ /* interpret negative counts as large numbers */
+ if (count < 0)
+ count &= ~mask;
+
+ /* no negative offsets */
+ offset &= ~mask;
+
+ /* count + offset must be in range */
+ while ((offset < 0 || (offset + count < 0)) && mask)
+ {
+ offset &= ~mask;
+ mask = mask >> 1;
+ }
+#endif
+
+
+ DEBUG(5,("fcntl_lock %d %d %d %d %d\n",fd,op,(int)offset,(int)count,type));
+
+ lock.l_type = type;
+ lock.l_whence = SEEK_SET;
+ lock.l_start = (int)offset;
+ lock.l_len = (int)count;
+ lock.l_pid = 0;
+
+ errno = 0;
+
+ ret = fcntl(fd,op,&lock);
+
+ if (errno != 0)
+ DEBUG(3,("fcntl lock gave errno %d (%s)\n",errno,strerror(errno)));
+
+ /* a lock query */
+ if (op == F_GETLK)
+ {
+ if ((ret != -1) &&
+ (lock.l_type != F_UNLCK) &&
+ (lock.l_pid != 0) &&
+ (lock.l_pid != getpid()))
+ {
+ DEBUG(3,("fd %d is locked by pid %d\n",fd,lock.l_pid));
+ return(True);
+ }
+
+ /* it must be not locked or locked by me */
+ return(False);
+ }
+
+ /* a lock set or unset */
+ if (ret == -1)
+ {
+ DEBUG(3,("lock failed at offset %d count %d op %d type %d (%s)\n",
+ offset,count,op,type,strerror(errno)));
+
+ /* perhaps it doesn't support this sort of locking?? */
+ if (errno == EINVAL)
+ {
+ DEBUG(3,("locking not supported? returning True\n"));
+ return(True);
+ }
+
+ return(False);
+ }
+
+ /* everything went OK */
+ DEBUG(5,("Lock call successful\n"));
+
+ return(True);
+#else
+ return(False);
+#endif
+}
+
+/*******************************************************************
+lock a file - returning a open file descriptor or -1 on failure
+The timeout is in seconds. 0 means no timeout
+********************************************************************/
+int file_lock(char *name,int timeout)
+{
+ int fd = open(name,O_RDWR|O_CREAT,0666);
+ time_t t=0;
+ if (fd < 0) return(-1);
+
+#if HAVE_FCNTL_LOCK
+ if (timeout) t = time(NULL);
+ while (!timeout || (time(NULL)-t < timeout)) {
+ if (fcntl_lock(fd,F_SETLK,0,1,F_WRLCK)) return(fd);
+ msleep(LOCK_RETRY_TIMEOUT);
+ }
+ return(-1);
+#else
+ return(fd);
+#endif
+}
+
+/*******************************************************************
+unlock a file locked by file_lock
+********************************************************************/
+void file_unlock(int fd)
+{
+ if (fd<0) return;
+#if HAVE_FCNTL_LOCK
+ fcntl_lock(fd,F_SETLK,0,1,F_UNLCK);
+#endif
+ close(fd);
+}
+