I have a unix Datagram sockets opened between two processes running on same machine. However, my client process is sending request to itself instead of server.
I have kept FilePath to which sockets bind different. However, if I keep Filepath same then though client is able to send request to server but server sends response to itself. Please check this link for a question which is related to this question. There is almost full code there.
Below is the problematic code snippet at client:
int msimcli_ConnectToSocket(const char* socketFile,int isSockTypeStreaming, SOCKET_PARAMS* socketParam)
{
int rc = ROK;
int result = 0;
char buffer[CLI_MAX_BUF_SIZE];
int buffer_size = CLI_MAX_BUF_SIZE;
int option = 1;
socklen_t len;
MSIM_ZERO(*socketParam);
pthread_t snd_tid;
pthread_t rx_tid;
if (isSockTypeStreaming)
{
socketParam->type = SOCK_STREAM;
}
else
{
socketParam->type = SOCK_DGRAM;
}
socketParam->fd = socket(AF_UNIX, socketParam->type, 0);
if (0 > socketParam->fd)
{
rc = RFAILED;
goto Exit;
}
else{
printf("socket created successfully with socket descriptor %d\n",socketParam->fd);
}
rc = setsockopt(socketParam->fd, SOL_SOCKET, (SO_REUSEADDR), &option, sizeof(option));
if (-1 == rc)
{
printf("setsockopt failed\r\n");
close(socketParam->fd);
socketParam->fd = -1;
goto Exit;
}
/* Bind Unix socket to a FilePath */
socketParam->remote.sun_family = AF_UNIX;
unlink(socketParam->remote.sun_path);
strcpy(socketParam->remote.sun_path, socketFile);
socketParam->len = strlen(socketParam->remote.sun_path) + sizeof(socketParam->remote.sun_family) + 1;
rc = bind(socketParam->fd, (struct sockaddr*)&socketParam->remote, socketParam->len);
if (-1 == rc)
{
printf("setsockopt failed\r\n");
close(socketParam->fd);
socketParam->fd = -1;
goto Exit;
}
/* Create Receiver thread */
if(ROK != (rc = pthread_create(&rx_tid,NULL,msimcli_RecvFromSocket,NULL)))
{
printf("Thread create for Receiver failed\n");
goto Exit;
}
Exit:
if (ROK != rc)
{
printf("%s: errno=0x%x %s\r\n", __FUNCTION__,errno, strerror(errno));
if (-1 < socketParam->fd)
{
close(socketParam->fd);
socketParam->fd = -1;
}
}
printf("<< rc %d\r\n", rc);
return rc;
}
int msimcli_SendToSocket(void* buf)
{
int rc = ROK;
/*Test buffer*/
cliCmd *buff = (cliCmd *)buf;
printf("Buff %s\n", ((cliCmd *)buf)->buf);
for (int i = 0; i < buff->hdr.msglen; i++)
{
printf("[%x]", buff[i]);
}
printf("\n");
printf("sending on socket [%d]\n",datagramSocket.fd);
rc = sendto(datagramSocket.fd, buf, buff->hdr.msglen, 0, \
(struct sockaddr *)&datagramSocket.remote, datagramSocket.len);
if (rc == -1) {
printf("%s: errno=0x%x %s\r\n", __FUNCTION__,errno, strerror(errno));
printf("SENDTO ERROR\n");
close(datagramSocket.fd);
return 0;
}
else {
printf("Data sent!\n");
return rc;
}
}
I expect a smooth message exchange between two processes.
