add socks_decoder, stratum_decoder and session_flags

include/stellar/socks_decoder.h

@@ -0,0 +1,44 @@
+#include <sys/uio.h>
+ 
+#include <netinet/in.h>
+#ifndef IPV6_ADDR_LEN
+#define IPV6_ADDR_LEN   (sizeof(struct in6_addr))
+#endif
+
+
+#define SOCKS_MESSAGE_TOPIC "TOPIC_SOCKS"
+
+
+enum socks_addr_type
+{
+    SOCKS_ADDR_IPV4,
+    SOCKS_ADDR_IPV6,
+    SOCKS_ADDR_FQDN
+};
+ 
+struct socks_addr
+{
+    enum socks_addr_type type;
+    union
+    {
+        uint32_t ipv4;  /* network order */
+        uint8_t ipv6[IPV6_ADDR_LEN] ;
+        struct iovec fqdn;
+    };
+    uint16_t port;  /* network order */
+};
+ 
+enum socks_version
+{
+    SOCKS_VERSION_4,
+    SOCKS_VERSION_5
+};
+ 
+struct socks_info
+{
+    enum socks_version version;
+    struct socks_addr dst_addr;
+    struct iovec user_name;
+    struct iovec password;
+};//message data
+