MEDIUM: proxy_protocol: Support sending unique IDs using PPv2
This patch adds the `unique-id` option to `proxy-v2-options`. If this
option is set a unique ID will be generated based on the `unique-id-format`
while sending the proxy protocol v2 header and stored as the unique id for
the first stream of the connection.
This feature is meant to be used in `tcp` mode. It works on HTTP mode, but
might result in inconsistent unique IDs for the first request on a keep-alive
connection, because the unique ID for the first stream is generated earlier
than the others.
Now that we can send unique IDs in `tcp` mode the `%ID` log variable is made
available in TCP mode.
diff --git a/include/types/server.h b/include/types/server.h
index 099b1d8..0257f58 100644
--- a/include/types/server.h
+++ b/include/types/server.h
@@ -154,6 +154,7 @@
#define SRV_PP_V2_SSL_CIPHER 0x0040 /* proxy protocol version 2 with cipher used */
#define SRV_PP_V2_AUTHORITY 0x0080 /* proxy protocol version 2 with authority */
#define SRV_PP_V2_CRC32C 0x0100 /* proxy protocol version 2 with crc32c */
+#define SRV_PP_V2_UNIQUE_ID 0x0200 /* proxy protocol version 2 with unique ID */
/* function which act on servers need to return various errors */
#define SRV_STATUS_OK 0 /* everything is OK. */