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src/libCom/bsdSockResCom.c

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+
+/*
+ *	    $Id$
+ *
+ *      socket support library generic code
+ *
+ *      7-1-97  -joh-
+ *
+ *      Experimental Physics and Industrial Control System (EPICS)
+ *
+ *      Copyright 1991, the Regents of the University of California,
+ *      and the University of Chicago Board of Governors.
+ *
+ *      This software was produced under  U.S. Government contracts:
+ *      (W-7405-ENG-36) at the Los Alamos National Laboratory,
+ *      and (W-31-109-ENG-38) at Argonne National Laboratory.
+ *
+ *      Initial development by:
+ *              The Controls and Automation Group (AT-8)
+ *              Ground Test Accelerator
+ *              Accelerator Technology Division
+ *              Los Alamos National Laboratory
+ *
+ *      Co-developed with
+ *              The Controls and Computing Group
+ *              Accelerator Systems Division
+ *              Advanced Photon Source
+ *              Argonne National Laboratory
+ *
+ *		Lawrence Berkley National Laboratory
+ *
+ *      Modification Log:
+ *      -----------------
+ */
+
+#include <stdio.h>
+#include <string.h>
+
+#define epicsExportSharedSymbols
+#include <epicsAssert.h>
+#include <bsdSocketResource.h>
+
+#define nDigitsDottedIP 4u
+#define maxChunkDigit 3u
+#define maxDottedIPDigit ((nDigitsDottedIP-1) + nDigitsDottedIP*maxChunkDigit)
+#define chunkSize 8u
+#define maxPortDigits 5u
+
+#define makeMask(NBITS) ((1u<<((unsigned)NBITS))-1u)
+
+/*
+ * ipAddrToA() 
+ * (convert IP address to ASCII host name)
+ */
+void epicsShareAPI ipAddrToA 
+			(const struct sockaddr_in *paddr, char *pBuf, unsigned bufSize)
+{
+    sockAddrToA ( (struct sockaddr *)paddr, pBuf, bufSize);
+}
+
+
+/*
+ * sockAddrToA() 
+ * (convert socket address to ASCII host name)
+ */
+void epicsShareAPI sockAddrToA 
+			(const struct sockaddr *paddr, char *pBuf, unsigned bufSize)
+{
+	if (bufSize<1) {
+		return;
+	}
+
+	if (paddr->sa_family!=AF_INET) {
+		strncpy (pBuf, "<Ukn Addr Type>", bufSize-1);
+		/*
+		 * force null termination
+		 */
+		pBuf[bufSize-1] = '\0';
+	}
+	else {
+        struct sockaddr_in *paddr_in = (struct sockaddr_in *) paddr;
+        unsigned len;
+
+		len = ipAddrToHostName (&paddr_in->sin_addr, pBuf, bufSize);
+		if (len==0) {
+
+            if (bufSize>maxDottedIPDigit) {
+                unsigned chunk[nDigitsDottedIP];
+                unsigned addr = ntohl (paddr_in->sin_addr.s_addr);
+                unsigned i;
+
+                for (i=0; i<nDigitsDottedIP; i++) {
+                    chunk[i] = addr & makeMask(chunkSize);
+#if 0
+                    addr >>= chunkSize;
+#endif
+                }
+
+                /*
+                 * inet_ntoa() isnt used because it isnt thread safe
+                 * (and the replacements are not standardized)
+                 */
+                len = (unsigned) sprintf (pBuf, "%u.%u.%u.%u", 
+                        chunk[3], chunk[2], chunk[1], chunk[0]);
+            }
+            else {
+                strncpy (pBuf, "<Invalid IP address>", bufSize);
+		        pBuf[bufSize-1] = '\0';
+                len = strlen (pBuf);
+            }
+
+		}
+
+        assert (len<bufSize);
+        bufSize -= len;
+
+		/*
+		 * allow space for the port number
+		 */
+		if (bufSize>maxPortDigits) {
+			sprintf (&pBuf[len], ":%hu", ntohs(paddr_in->sin_port));
+		}
+	}
+}