warning fixes

Author: JacobBarthelmeh

src/tpm2_swtpm.c

@@ -84,7 +84,7 @@
     #define TPM2_SWTPM_PORT         115200
     #endif
     #ifndef TPM2_TIMEOUT_SECONDS
-    #define TPM2_TIMEOUT_SECONDS    7200
+    #define TPM2_TIMEOUT_SECONDS    21600
     #endif
     #define WOLFTPM_WRITE(u, b, sz) XUartNs550_Send(&(u), (b), (sz))
     #define WOLFTPM_READ(u, b, sz)  XUartNs550_Recv(&(u), (b), (sz))
@@ -282,6 +282,7 @@ static int SwTpmReceive(TPM2_CTX* ctx, void* buffer, size_t rxSz)
     int rc;
     size_t remain, rxRemain;
     int sendAck = 0;
+    int timeOut = TPM2_TIMEOUT_SECONDS;
 
     if (ctx == NULL || buffer == NULL) {
         return BAD_FUNC_ARG;
@@ -292,7 +293,7 @@ static int SwTpmReceive(TPM2_CTX* ctx, void* buffer, size_t rxSz)
 
     /* use up any leftovers before trying to pull more */
     if (rxBuffIdx > 0) {
-        int minSz = (rxBuffIdx < remain)? rxBuffIdx : remain;
+        int minSz = (rxBuffIdx < (int)remain)? rxBuffIdx : (int)remain;
 
         memcpy(buffer, rxBuff, minSz);
         if (rxBuffIdx > minSz) {
@@ -314,19 +315,29 @@ static int SwTpmReceive(TPM2_CTX* ctx, void* buffer, size_t rxSz)
         if (rc > 0 ) {
             usleep(500);
             sendAck = 1;
+            timeOut = TPM2_TIMEOUT_SECONDS; /* reset timeout */
         }
 
         if (rc == 0) {
             if (sendAck) {
-                char buffer[1] = {0x01};
+                unsigned char tmpBuf[1] = {0x01};
 
                 sendAck = 0;
-                WOLFTPM_WRITE(ctx->tcpCtx.fd, buffer, 1);
+                WOLFTPM_WRITE(ctx->tcpCtx.fd, tmpBuf, 1);
             }
 
             if (rxBuffIdx >= rxRemain || rxRemain == 0) {
                 break;
             }
+
+            if ((timeOut--) <= 0) {
+                rxBuffIdx = 0; /* reset read state */
+                rc = SOCKET_ERROR_E; /* timeout */
+            #if DEBUG_WOLFTPM
+                DEBUG_PRINTF("Connection timed out\r\n");
+            #endif
+                break;
+            }
             continue; /* keep trying */
         }
 
@@ -364,7 +375,7 @@ static int SwTpmReceive(TPM2_CTX* ctx, void* buffer, size_t rxSz)
 }
 
 
-static int SwTpmConnect(TPM2_CTX* ctx, const char* uartDev, uint32_t baud)
+static int SwTpmConnect(TPM2_CTX* ctx, uint32_t baud)
 {
     int ret = TPM_RC_SUCCESS;
     XUartNs550_Config *config;
@@ -510,12 +521,14 @@ int TPM2_SWTPM_SendCommand(TPM2_CTX* ctx, TPM2_Packet* packet)
 
 #if !defined(WOLFTPM_SWTPM_UARTNS550)
     if (ctx->tcpCtx.fd < 0) {
+        rc = SwTpmConnect(ctx, TPM2_SWTPM_HOST, TPM2_SWTPM_PORT);
+    }
 #else
     if (ctx->tcpCtx.setup == 0) {
         ctx->tcpCtx.setup = 1;
-#endif
-        rc = SwTpmConnect(ctx, TPM2_SWTPM_HOST, TPM2_SWTPM_PORT);
+        rc = SwTpmConnect(ctx, TPM2_SWTPM_PORT);
     }
+#endif
 
 #ifdef WOLFTPM_DEBUG_VERBOSE
     DEBUG_PRINTF("Command size: %d\n\r", packet->pos);