[MEDIUM] backend: move the transparent proxy address selection to backend
The transparent proxy address selection was set in the TCP connect function
which is not the most appropriate place since this function has limited
access to the amount of parameters which could produce a source address.
Instead, now we determine the source address in backend.c:connect_server(),
right after calling assign_server_address() and we assign this address in
the session and pass it to the TCP connect function. This cannot be performed
in assign_server_address() itself because in some cases (transparent mode,
dispatch mode or http_proxy mode), we assign the address somewhere else.
This change will open the ability to bind to addresses extracted from many
other criteria (eg: from a header).
diff --git a/include/types/session.h b/include/types/session.h
index 5258750..94bb5d5 100644
--- a/include/types/session.h
+++ b/include/types/session.h
@@ -170,6 +170,7 @@
struct sockaddr_storage cli_addr; /* the client address */
struct sockaddr_storage frt_addr; /* the frontend address reached by the client if SN_FRT_ADDR_SET is set */
struct sockaddr_in srv_addr; /* the address to connect to */
+ struct sockaddr_in from_addr; /* the address to spoof when connecting to the server (transparent mode) */
struct server *srv; /* the server the session will be running or has been running on */
struct server *srv_conn; /* session already has a slot on a server and is not in queue */
struct server *prev_srv; /* the server the was running on, after a redispatch, otherwise NULL */