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<== Date ==> <== Thread ==>

Subject: Binding an IOC to a single network interface
From: <[email protected]>
To: <[email protected]>
Date: Wed, 22 Jan 2014 14:30:29 +0000
Hi,

we are looking to run a set of IOCs that bind channel access to just the loopback interface on the computer; however I saw from the 3.14 docs that EPICS_CAS_INTF_ADDR_LIST is not currently implemented in the iocCore CA Server. I had a look at the code in base/src/rsrv and the attached diff (against 3.14.12.2) seems to work for us with:

EPICS_CAS_INTF_ADDR_LIST=127.0.0.1
EPICS_CAS_BEACON_ADDR_LIST=127.255.255.255

I was just wondering if these additions are sufficient, or have I missed something elsewhere that either needs changing too or might cause issues later on?

Thanks,

Freddie 


-- 
Scanned by iCritical.

Index: src/rsrv/cast_server.c
===================================================================
--- src/rsrv/cast_server.c	(revision 774)
+++ src/rsrv/cast_server.c	(working copy)
@@ -122,6 +122,7 @@
     osiSocklen_t        recv_addr_size;
     unsigned short      port;
     osiSockIoctl_t      nchars;
+    const char*         pStr;
 
     if ( envGetConfigParamPtr ( &EPICS_CAS_SERVER_PORT ) ) {
         port = envGetInetPortConfigParam ( &EPICS_CAS_SERVER_PORT, 
@@ -178,8 +179,19 @@
     /*  Zero the sock_addr structure */
     memset((char *)&sin, 0, sizeof(sin));
     sin.sin_family = AF_INET;
-    sin.sin_addr.s_addr = htonl(INADDR_ANY);
-    sin.sin_port = htons(port);
+    pStr = envGetConfigParamPtr ( & EPICS_CAS_INTF_ADDR_LIST );
+    if (pStr) {
+        /* this implementation only allows for specifying a single address in EPICS_CAS_INTF_ADDR_LIST */
+        status = aToIPAddr (pStr, port, &sin);
+        if (status) {
+            epicsPrintf("CAS: Error parsing %s '%s'\n", EPICS_CAS_INTF_ADDR_LIST.name, pStr);
+            sin.sin_addr.s_addr = htonl(INADDR_ANY);
+            sin.sin_port = htons(port);
+        }
+    } else {
+        sin.sin_addr.s_addr = htonl(INADDR_ANY);
+        sin.sin_port = htons(port);
+    }
     
     /* get server's Internet address */
     if( bind(IOC_cast_sock, (struct sockaddr *)&sin, sizeof (sin)) < 0){
Index: src/rsrv/caservertask.c
===================================================================
--- src/rsrv/caservertask.c	(revision 774)
+++ src/rsrv/caservertask.c	(working copy)
@@ -69,7 +69,7 @@
     SOCKET clientSock;
     epicsThreadId tid;
     int portChange;
-
+    const char* pStr;
     epicsSignalInstallSigPipeIgnore ();
 
     taskwdInsert ( epicsThreadGetIdSelf (), NULL, NULL );
@@ -103,8 +103,19 @@
     /* Zero the sock_addr structure */
     memset ( (void *) &serverAddr, 0, sizeof ( serverAddr ) );
     serverAddr.sin_family = AF_INET;
-    serverAddr.sin_addr.s_addr = htonl (INADDR_ANY); 
-    serverAddr.sin_port = htons ( ca_server_port );
+    pStr = envGetConfigParamPtr ( & EPICS_CAS_INTF_ADDR_LIST );
+    if (pStr) {
+        /* this implementation only allows for specifying a single address in EPICS_CAS_INTF_ADDR_LIST */
+        status = aToIPAddr (pStr, ca_server_port, &serverAddr);
+        if (status) {
+            epicsPrintf("CAS: Error parsing %s '%s'\n", EPICS_CAS_INTF_ADDR_LIST.name, pStr);
+            serverAddr.sin_addr.s_addr = htonl(INADDR_ANY);
+            serverAddr.sin_port = htons(ca_server_port);
+        }
+    } else {
+        serverAddr.sin_addr.s_addr = htonl(INADDR_ANY);
+        serverAddr.sin_port = htons(ca_server_port);
+    }
 
     /* get server's Internet address */
     status = bind ( IOC_sock, (struct sockaddr *) &serverAddr, sizeof ( serverAddr ) );

Replies:
Re: Binding an IOC to a single network interface J. Lewis Muir
Re: Binding an IOC to a single network interface J. Lewis Muir

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