/* return 1 on success.
* return 0 if no data received.
* return -1 on failure (connection refused).
*/
static int proxy_http_read_connection_response(TCP_Client_Connection *TCP_conn)
{
char success[] = "200";
uint8_t data[16]; // draining works the best if the length is a power of 2
int ret = read_TCP_packet(TCP_conn->sock, data, sizeof(data) - 1);
if (ret == -1) {
return 0;
}
data[sizeof(data) - 1] = 0;
if (strstr((char *)data, success)) {
// drain all data
unsigned int data_left = TCP_socket_data_recv_buffer(TCP_conn->sock);
if (data_left) {
VLA(uint8_t, temp_data, data_left);
read_TCP_packet(TCP_conn->sock, temp_data, data_left);
}
return 1;
}
return -1;
}
/* Read length bytes from socket.
*
* return length on success
* return -1 on failure/no data in buffer.
*/
int read_TCP_packet(sock_t sock, uint8_t *data, uint16_t length)
{
unsigned int count = TCP_socket_data_recv_buffer(sock);
if (count >= length) {
int len = recv(sock, (char *)data, length, MSG_NOSIGNAL);
if (len != length) {
fprintf(stderr, "FAIL recv packet\n");
return -1;
}
return len;
}
return -1;
}
/* Read the next two bytes in TCP stream then convert them to
* length (host byte order).
*
* return length on success
* return 0 if nothing has been read from socket.
* return ~0 on failure.
*/
uint16_t read_TCP_length(sock_t sock)
{
unsigned int count = TCP_socket_data_recv_buffer(sock);
if (count >= sizeof(uint16_t)) {
uint16_t length;
int len = recv(sock, (char *)&length, sizeof(uint16_t), MSG_NOSIGNAL);
if (len != sizeof(uint16_t)) {
fprintf(stderr, "FAIL recv packet\n");
return 0;
}
length = ntohs(length);
if (length > MAX_PACKET_SIZE) {
return ~0;
}
return length;
}
return 0;
}