fix coverity scan bugs

src/rpc/src/rpcMain.c

@@ -218,9 +218,9 @@ void *rpcOpen(const SRpcInit *pInit) {
   pRpc->localPort = pInit->localPort;
   pRpc->afp = pInit->afp;
   pRpc->sessions = pInit->sessions+1;
-  if (pInit->user) strcpy(pRpc->user, pInit->user);
-  if (pInit->secret) strcpy(pRpc->secret, pInit->secret);
-  if (pInit->ckey) strcpy(pRpc->ckey, pInit->ckey);
+  if (pInit->user) tstrncpy(pRpc->user, pInit->user, sizeof(pRpc->user));
+  if (pInit->secret) memcpy(pRpc->secret, pInit->secret, sizeof(pRpc->secret));
+  if (pInit->ckey) tstrncpy(pRpc->ckey, pInit->ckey, sizeof(pRpc->ckey));
   pRpc->spi = pInit->spi;
   pRpc->cfp = pInit->cfp;
   pRpc->afp = pInit->afp;
@@ -435,6 +435,7 @@ void rpcSendResponse(const SRpcMsg *pRsp) {
 
 void rpcSendRedirectRsp(void *thandle, const SRpcIpSet *pIpSet) {
   SRpcMsg  rpcMsg; 
+  memset(&rpcMsg, 0, sizeof(rpcMsg));
   
   rpcMsg.contLen = sizeof(SRpcIpSet);
   rpcMsg.pCont = rpcMallocCont(rpcMsg.contLen);

src/rpc/src/rpcTcp.c

@@ -253,12 +253,14 @@ void *taosInitTcpClient(uint32_t ip, uint16_t port, char *label, int num, void *
 
   if (pthread_mutex_init(&(pThreadObj->mutex), NULL) < 0) {
     tError("%s failed to init TCP client mutex(%s)", label, strerror(errno));
+    free(pThreadObj);
     return NULL;
   }
 
   pThreadObj->pollFd = epoll_create(10);  // size does not matter
   if (pThreadObj->pollFd < 0) {
     tError("%s failed to create TCP client epoll", label);
+    free(pThreadObj);
     return NULL;
   }
 
@@ -269,6 +271,8 @@ void *taosInitTcpClient(uint32_t ip, uint16_t port, char *label, int num, void *
   int code = pthread_create(&(pThreadObj->thread), &thattr, taosProcessTcpData, (void *)(pThreadObj));
   pthread_attr_destroy(&thattr);
   if (code != 0) {
+    close(pThreadObj->pollFd);
+    free(pThreadObj);
     tError("%s failed to create TCP read data thread(%s)", label, strerror(errno));
     return NULL;
   }

src/rpc/test/rclient.c

@@ -14,6 +14,7 @@
  */
 
 #include "os.h"
+#include "tutil.h"
 #include "tglobal.h"
 #include "rpcLog.h"
 #include "trpc.h"
@@ -105,7 +106,7 @@ int main(int argc, char *argv[]) {
     if (strcmp(argv[i], "-p")==0 && i < argc-1) {
       ipSet.port[0] = atoi(argv[++i]);
     } else if (strcmp(argv[i], "-i") ==0 && i < argc-1) {
-      strcpy(ipSet.fqdn[0], argv[++i]); 
+      tstrncpy(ipSet.fqdn[0], argv[++i], sizeof(ipSet.fqdn)); 
     } else if (strcmp(argv[i], "-t")==0 && i < argc-1) {
       rpcInit.numOfThreads = atoi(argv[++i]);
     } else if (strcmp(argv[i], "-m")==0 && i < argc-1) {

src/rpc/test/rsclient.c

@@ -15,6 +15,7 @@
 
 
 #include "os.h"
+#include "tutil.h"
 #include "tglobal.h"
 #include "rpcLog.h"
 #include "trpc.h"
@@ -106,7 +107,7 @@ int main(int argc, char *argv[]) {
     if (strcmp(argv[i], "-p")==0 && i < argc-1) {
       ipSet.port[0] = atoi(argv[++i]);
     } else if (strcmp(argv[i], "-i") ==0 && i < argc-1) {
-      strcpy(ipSet.fqdn[0], argv[++i]); 
+      tstrncpy(ipSet.fqdn[0], argv[++i], sizeof(ipSet.fqdn)); 
     } else if (strcmp(argv[i], "-t")==0 && i < argc-1) {
       rpcInit.numOfThreads = atoi(argv[++i]);
     } else if (strcmp(argv[i], "-m")==0 && i < argc-1) {

src/rpc/test/rserver.c

@@ -69,6 +69,7 @@ void processShellMsg() {
       taosGetQitem(qall, &type, (void **)&pRpcMsg);
       rpcFreeCont(pRpcMsg->pCont);
 
+      memset(&rpcMsg, 0, sizeof(rpcMsg));
       rpcMsg.pCont = rpcMallocCont(msgSize);
       rpcMsg.contLen = msgSize;
       rpcMsg.handle = pRpcMsg->handle;

src/util/inc/tutil.h

@@ -42,6 +42,11 @@ extern "C" {
     }            \
   }
 
+#define tstrncpy(dst, src, size) do { \
+    strncpy((dst), (src), (size)); \
+    (dst)[(size) - 1] = 0; \
+} while (0);
+
 #define tclose(x) taosCloseSocket(x)
 
 // Pointer p drift right by b bytes

src/wal/test/waltest.c

@@ -15,6 +15,7 @@
 
 //#define _DEFAULT_SOURCE
 #include "os.h"
+#include "tutil.h"
 #include "tglobal.h"
 #include "tlog.h"
 #include "twal.h"
@@ -45,7 +46,7 @@ int main(int argc, char *argv[]) {
 
   for (int i=1; i<argc; ++i) {
     if (strcmp(argv[i], "-p")==0 && i < argc-1) {
-      strcpy(path, argv[++i]);
+      tstrncpy(path, argv[++i], sizeof(path));
     } else if (strcmp(argv[i], "-m")==0 && i < argc-1) {
       max = atoi(argv[++i]);
     } else if (strcmp(argv[i], "-l")==0 && i < argc-1) {