[Pcsclite-cvs-commit] r3287 - in /trunk/PCSC/src: utils.c utils.h

[rousseau at users.alioth.debian.org]

Author: rousseau
Date: Tue Jan 20 15:16:55 2009
New Revision: 3287

URL: http://svn.debian.org/wsvn/pcsclite/?sc=1&rev=3287
Log:
add StatSynchronizeContext() to send an asynchronous event to a specific
context
This function can be used from libpcsclite. Using StatSynchronize() does
not work since the directory pcscd.events/ is not readable by group and
other for security reasons

Modified:
    trunk/PCSC/src/utils.c
    trunk/PCSC/src/utils.h

Modified: trunk/PCSC/src/utils.c
URL: http://svn.debian.org/wsvn/pcsclite/trunk/PCSC/src/utils.c?rev=3287&op=diff
==============================================================================
--- trunk/PCSC/src/utils.c (original)
+++ trunk/PCSC/src/utils.c Tue Jan 20 15:16:55 2009
@@ -152,6 +152,45 @@
 
 
 /**
+ * Sends an asynchronous event to any waiting client
+ *
+ * Just write 1 byte to any fifo in PCSCLITE_EVENTS_DIR and remove the file
+ *
+ * This function must be secured since the files are created by the library
+ * or any non privileged process. We must not follow symlinks for example
+ */
+int StatSynchronizeContext(SCARDCONTEXT hContext)
+{
+	char filename[FILENAME_MAX];
+	int fd;
+	char buf[] = { '\0' };
+	struct stat fstat_buf;
+
+	(void)snprintf(filename, sizeof(filename), "%s/event.%d.%ld",
+		PCSCLITE_EVENTS_DIR, SYS_GetPID(), hContext);
+	(void)mkfifo(filename, 0644);
+	fd = SYS_OpenFile(filename, O_WRONLY, 0);
+
+	if (fstat(fd, &fstat_buf))
+	{
+		Log3(PCSC_LOG_ERROR, "Can't fstat %s: %s", filename, strerror(errno));
+	}
+	else
+	{
+		/* check that the file is a FIFO */
+		if (!(fstat_buf.st_mode & S_IFIFO))
+			Log2(PCSC_LOG_ERROR, "%s is not a fifo", filename);
+		else
+			(void)SYS_WriteFile(fd, buf, sizeof(buf));
+	}
+
+	(void)SYS_CloseFile(fd);
+
+	return 0;
+} /* StatSynchronize */
+
+
+/**
  * Check is OpenCT is running and display a critical message if it is
  *
  * The first cause of pcsc-lite failure is that OpenCT is installed and running

Modified: trunk/PCSC/src/utils.h
URL: http://svn.debian.org/wsvn/pcsclite/trunk/PCSC/src/utils.h?rev=3287&op=diff
==============================================================================
--- trunk/PCSC/src/utils.h (original)
+++ trunk/PCSC/src/utils.h Tue Jan 20 15:16:55 2009
@@ -22,6 +22,7 @@
 LONG SCardCheckDaemonAvailability(void);
 
 int StatSynchronize(/*@null@*/ struct pubReaderStatesList *readerState);
+int StatSynchronizeContext(SCARDCONTEXT hContext);
 
 int CheckForOpenCT(void);