MEDIUM: connection: add an error code in connections

This will be needed to improve error reporting, especially for SSL.

include/types/connection.h

@@ -142,6 +142,12 @@ enum {
 	CO_FL_XPRT_TRACKED  = 0x80000000,
 };
 
+
+/* possible connection error codes */
+enum {
+	CO_ER_NONE,             /* no error */
+};
+
 /* xprt_ops describes transport-layer operations for a connection. They
  * generally run over a socket-based control layer, but not always. Some
  * of them are used for data transfer with the upper layer (rcv_*, snd_*)
@@ -186,7 +192,7 @@ struct connection {
 	const struct protocol *ctrl;  /* operations at the socket layer */
 	const struct xprt_ops *xprt;  /* operations at the transport layer */
 	const struct data_cb  *data;  /* data layer callbacks */
-	unsigned int flags;           /* CO_F_* */
+	unsigned int flags;           /* CO_FL_* */
 	int xprt_st;                  /* transport layer state, initialized to zero */
 	void *xprt_ctx;               /* general purpose pointer, initialized to NULL */
 	void *owner;                  /* pointer to upper layer's entity (eg: stream interface) */
@@ -195,6 +201,7 @@ struct connection {
 			int fd;       /* file descriptor for a stream driver when known */
 		} sock;
 	} t;
+	unsigned int err_code;        /* CO_ER_* */
 	enum obj_type *target;        /* the target to connect to (server, proxy, applet, ...) */
 	struct {
 		struct sockaddr_storage from;	/* client address, or address to spoof when connecting to the server */

src/checks.c

@@ -1298,6 +1298,7 @@ static struct task *process_chk(struct task *t)
 
 		/* prepare a new connection */
 		conn->flags = CO_FL_NONE;
+		conn->err_code = CO_ER_NONE;
 		conn->target = &s->obj_type;
 		conn_prepare(conn, &check_conn_cb, s->check.proto, s->check.xprt, s);
 

src/peers.c

@@ -1156,6 +1156,7 @@ static struct session *peer_session_create(struct peer *peer, struct peer_sessio
 
 	s->si[0].conn->t.sock.fd = -1;
 	s->si[0].conn->flags = CO_FL_NONE;
+	s->si[0].conn->err_code = CO_ER_NONE;
 	s->si[0].owner = t;
 	s->si[0].state = s->si[0].prev_state = SI_ST_EST;
 	s->si[0].err_type = SI_ET_NONE;
@@ -1174,6 +1175,7 @@ static struct session *peer_session_create(struct peer *peer, struct peer_sessio
 
 	s->si[1].conn->t.sock.fd = -1; /* just to help with debugging */
 	s->si[1].conn->flags = CO_FL_NONE;
+	s->si[1].conn->err_code = CO_ER_NONE;
 	s->si[1].owner = t;
 	s->si[1].state = s->si[1].prev_state = SI_ST_ASS;
 	s->si[1].conn_retries = p->conn_retries;

src/proto_http.c

@@ -4093,6 +4093,7 @@ void http_end_txn_clean_session(struct session *s)
 	s->req->cons->state     = s->req->cons->prev_state = SI_ST_INI;
 	s->req->cons->conn->t.sock.fd = -1; /* just to help with debugging */
 	s->req->cons->conn->flags = CO_FL_NONE;
+	s->req->cons->conn->err_code = CO_ER_NONE;
 	s->req->cons->err_type  = SI_ET_NONE;
 	s->req->cons->conn_retries = 0;  /* used for logging too */
 	s->req->cons->err_loc   = NULL;

src/session.c

@@ -109,6 +109,7 @@ int session_accept(struct listener *l, int cfd, struct sockaddr_storage *addr)
 	s->si[0].conn->t.sock.fd = cfd;
 	s->si[0].conn->ctrl = l->proto;
 	s->si[0].conn->flags = CO_FL_NONE;
+	s->si[0].conn->err_code = CO_ER_NONE;
 	s->si[0].conn->addr.from = *addr;
 	s->si[0].conn->target = &l->obj_type;
 
@@ -403,6 +404,7 @@ int session_complete(struct session *s)
 	 */
 	s->si[1].conn->t.sock.fd = -1; /* just to help with debugging */
 	s->si[1].conn->flags = CO_FL_NONE;
+	s->si[1].conn->err_code = CO_ER_NONE;
 	s->si[1].owner     = t;
 	s->si[1].state     = s->si[1].prev_state = SI_ST_INI;
 	s->si[1].err_type  = SI_ET_NONE;