Hi,
I have already used libxbee3 https://github.com/attie/libxbee3 to communicate between two XBee Zigbee module, where the server and client codes are communicating over ZigBee without any trouble.
Now I am trying to integrate TLS connection between them using wolfSSL. As libxbee3 abstracts the serial socket, I have no direct access to it. So I am trying to use wolfSSL memory-tls code https://github.com/wolfSSL/wolfssl-exam … mory-tls.c to communicate between the server and client.
My client send callback (libxbee3 sends little more than 64 bytes at a time, so I chose 64 bytes):
int ClientSend(WOLFSSL* ssl, char* buf, int sz, void* ctx)
{
printf("/*-------------------Send SZ: %d ------------------*/\n", sz);
int i=64, j=0, k;
char tmpbuf[65]={0};
char endbuf[]="END";
int tcnt=sz*2;
char asciiString[tcnt +1];
for (k = 0; k<sz; k++) {
sprintf(asciiString+2*k,"%02X", (unsigned char) *(buf+k));
}
asciiString[tcnt] = 0;
while((tcnt-j)>64){
memset(tmpbuf,0,sizeof(tmpbuf));
memcpy(tmpbuf,asciiString+j,i);
if ((xbee_conTx(con, NULL, tmpbuf)) != XBEE_ENONE) {
xbee_log(xbee, -1, "xbee_conTx() returned for sendloop");
}
else{
j=j+i;
}
}
memset(tmpbuf,0,sizeof(tmpbuf));
memcpy(tmpbuf,asciiString+j,(tcnt-j));
if ((xbee_conTx(con, NULL, tmpbuf)) != XBEE_ENONE) {
xbee_log(xbee, -1, "xbee_conTx() returned for last remaining bytes");
}
if ((xbee_conTx(con, NULL, endbuf)) != XBEE_ENONE) {
xbee_log(xbee, -1, "xbee_conTx() returned for ENDBUF");
}
printf("/*------------------- CLIENT SENDING ------------------*/\n");
for (k = 0; k < sz; k++) {
if (k > 0 && (k % 16) == 0)
printf("\n");
printf("%02x ", (unsigned char) buf[k]);
}
printf("\n/*------------------- CLIENT SENDING END ------------------*/\n");
return sz;
}
And my server receive callback:
int ServerRecv(WOLFSSL* ssl, char* buf, int sz, void* ctx)
{
char endbuf[4];
int i, j=0;
xbee_err ret;
struct xbee_pkt *pkt;
memset(buf,0,sizeof(buf));
while(1){
if((ret=xbee_conRx(localCon, &pkt, NULL)) != XBEE_ENONE){
xbee_log(xbee, -1, "xbee_conRx() returned for whileloop");
printf("Nothing rcvd\n");
continue;
}
if ((pkt)->dataLen > 0) {
memcpy(endbuf, (pkt)->data, 3);
if(!strncmp(endbuf,"END",3)){
xbee_pktFree(pkt);
break;
}
int hlpbuf[3]={0}, k=0, num;
for(k;k<((pkt)->dataLen/2);k++){
memcpy(hlpbuf,(pkt)->data+2*k,2);
num = (int)strtoul(hlpbuf, NULL, 16);
*(buf+j+k)=num;
}
j=j+((pkt)->dataLen/2);
if (xbee_pktFree(pkt) != XBEE_ENONE) return 1;
}
}
*(buf+j)='\0';
sz = j;
printf("SERVER WANTS TO READ: %d bytes\n", sz);
printf("/*------------------- SERVER READING ------------------*/\n");
for (i = 0; i < sz; i++) {
if (i > 0 && (i % 16) == 0)
printf("\n");
printf("%02x ", (unsigned char) *(buf+i));
}
printf("\n/*------------------- SERVER READING ------------------*/\n");
return sz;
}
Both Server send and Client receive callback are similar to above. When I run the code the client sends 148 bytes of data and then trying to receive using the receive callback:
/*-------------------Send SZ: 148 ------------------*/
/*------------------- CLIENT SENDING ------------------*/
16 03 03 00 8f 01 00 00 8b 03 03 c2 97 2f eb c4
53 e7 1e 4f c8 23 1c c3 90 f6 9f 4e 18 88 f7 a4
5d a7 f9 73 7d 08 80 5c 96 56 42 00 00 30 c0 2c
c0 2b c0 30 c0 2f 00 9f 00 9e cc a9 cc a8 cc aa
c0 27 c0 23 c0 28 c0 24 c0 0a c0 09 c0 14 c0 13
00 6b 00 67 00 39 00 33 cc 14 cc 13 cc 15 01 00
00 32 00 0d 00 12 00 10 06 03 05 03 04 03 02 03
06 01 05 01 04 01 02 01 00 0b 00 02 01 00 00 0a
00 0e 00 0c 00 10 00 13 00 15 00 17 00 18 00 19
00 17 00 00
/*------------------- CLIENT SENDING END ------------------*/
/*-------------------RCV SZ: 5 ------------------*/
Nothing rcvd
Nothing rcvd
Nothing rcvd
...
But the server is only receiving, and then give an error without trying to send back anything:
SERVER WANTS TO READ: 148 bytes
/*------------------- SERVER READING ------------------*/
16 03 03 00 8f 01 00 00 8b 03 03 c2 97 2f eb c4
53 e7 1e 4f c8 23 1c c3 90 f6 9f 4e 18 88 f7 a4
5d a7 f9 73 7d 08 80 5c 96 56 42 00 00 30 c0 2c
c0 2b c0 30 c0 2f 00 9f 00 9e cc a9 cc a8 cc aa
c0 27 c0 23 c0 28 c0 24 c0 0a c0 09 c0 14 c0 13
00 6b 00 67 00 39 00 33 cc 14 cc 13 cc 15 01 00
00 32 00 0d 00 12 00 10 06 03 05 03 04 03 02 03
06 01 05 01 04 01 02 01 00 0b 00 02 01 00 00 0a
00 0e 00 0c 00 10 00 13 00 15 00 17 00 18 00 19
00 17 00 00
/*------------------- SERVER READING ------------------*/
wolfSSL error: bad server tls accept
How could I check what the problem is? Why is it not working? The ssl setup code for the client and server are identical to memory-tls.c.
Please help me to find the issue.
Thank you.
Best regards