int cw_run_state_machine(struct conn * conn, time_t *timer) { int timerval; cw_StateMachineState_t search, *result; while(1){ search.state = conn->capwap_state; search.prevstate = conn->capwap_prevstate; result = mavl_get(conn->msgset->state_machine,&search); cw_dbg(DBG_STATE,"State transition: [%s -> %s]", cw_strstate(conn->capwap_prevstate), cw_strstate(conn->capwap_state) ); if (result == NULL){ cw_log(LOG_ERR,"State not found"); return 0; } if (result->jump_state){ conn->capwap_state = result->jump_state; conn->capwap_prevstate = result->jump_prevstate; cw_dbg(DBG_STATE,"Jump to state: [%s->%s]", cw_strstate(conn->capwap_prevstate), cw_strstate(conn->capwap_state)); continue; } if (result->dbgmsg){ cw_dbg(DBG_STATE,"%s",result->dbgmsg); } if (result->timer_key){ timerval = cw_ktv_get_word(conn->local_cfg,result->timer_key,result->timer_default); *timer = cw_timer_start(timerval); cw_dbg(DBG_STATE,"Starting timer: [%s] - %d seconds.",result->timer_key,timerval); } return result->retval; } }
static int process_elements(struct conn *conn, uint8_t * rawmsg, int len, struct sockaddr *from) { struct cw_action_in as, *af, *afm; int offset = cw_get_hdr_msg_offset(rawmsg); uint8_t *msg_ptr = rawmsg + offset; int elems_len = cw_get_msg_elems_len(msg_ptr); int payloadlen = len - offset; /* pre-check message */ if (payloadlen - 8 != elems_len) { if (conn->strict_hdr) { cw_dbg(DBG_MSG_ERR, "Discarding message from %s, msgelems len=%d, payload len=%d, (Strict CAPWAP) ", sock_addr2str(&conn->addr), elems_len, payloadlen - 8); errno = EAGAIN; return -1; } if (elems_len < payloadlen - 8) { cw_dbg(DBG_RFC, "Packet from from %s has %d bytes of extra data, ignoring.", sock_addr2str(&conn->addr), payloadlen - 8 - elems_len); elems_len = len - 8; } if (elems_len > payloadlen - 8) { cw_dbg(DBG_RFC, "Packet from from %s has msgelems len of %d bytes, but has only %d bytes of data, truncating.", sock_addr2str(&conn->addr), elems_len, payloadlen - 8); elems_len = payloadlen - 8; } } if (!conn->detected) { //struct mod_ac *mod; struct cw_actiondef *ad = load_mods(conn, rawmsg, len, elems_len, from); if (!ad) { cw_log(LOG_ERR, "Error"); errno = EAGAIN; return -1; } conn->actions = ad; conn->detected = 1; } /* prepare struct for search operation */ as.capwap_state = conn->capwap_state; as.msg_id = cw_get_msg_id(msg_ptr); as.vendor_id = 0; as.elem_id = 0; as.proto = 0; /* Search for state/message combination */ afm = cw_actionlist_in_get(conn->actions->in, &as); if (!afm) { /* Throw away unexpected response messages */ if (!(as.msg_id & 1)) { cw_dbg(DBG_MSG_ERR, "Message type %d (%s) unexpected/illegal in %s State, discarding.", as.msg_id, cw_strmsg(as.msg_id), cw_strstate(conn->capwap_state)); errno = EAGAIN; return -1; } /* Request message not found in current state, check if we know anything else about this message type */ const char *str = cw_strheap_get(conn->actions->strmsg, as.msg_id); int result_code = 0; if (str) { /* Message found, but it was in wrong state */ cw_dbg(DBG_MSG_ERR, "Message type %d (%s) not allowed in %s State.", as.msg_id, cw_strmsg(as.msg_id), cw_strstate(as.capwap_state)); result_code = CW_RESULT_MSG_INVALID_IN_CURRENT_STATE; } else { /* Message is unknown */ cw_dbg(DBG_MSG_ERR, "Message type %d (%s) unknown.", as.msg_id, cw_strmsg(as.msg_id), cw_strstate(as.capwap_state)); result_code = CW_RESULT_MSG_UNRECOGNIZED; } cw_send_error_response(conn, rawmsg, result_code); errno = EAGAIN; return -1; } if (conn->msg_start){ conn->msg_start(conn, afm, rawmsg, len, from); } /* Execute start processor for message */ if (afm->start) { afm->start(conn, afm, rawmsg, len, from); } uint8_t *elems_ptr = cw_get_msg_elems_ptr(msg_ptr); uint8_t *elem; /* Create an avltree to catch the found mandatory elements */ conn->mand = stravltree_create(); int unrecognized = 0; /* iterate through message elements */ cw_foreach_elem(elem, elems_ptr, elems_len) { as.elem_id = cw_get_elem_id(elem); int elem_len = cw_get_elem_len(elem); af = cw_actionlist_in_get(conn->actions->in, &as); if (!af) { unrecognized++; cw_dbg(DBG_ELEM_ERR, "Element %d (%s) not allowed in msg of type %d (%s), ignoring.", as.elem_id, cw_strelemp(conn->actions, as.elem_id), as.msg_id, cw_strmsg(as.msg_id)); continue; } if (!check_len(conn, af, cw_get_elem_data(elem), elem_len, from)) { continue; } cw_dbg_elem(DBG_ELEM, conn, as.msg_id, as.elem_id, cw_get_elem_data(elem), elem_len); int afrc = 1; if (af->start) { afrc = af->start(conn, af, cw_get_elem_data(elem), elem_len, from); } if (af->mand && afrc) { /* add found mandatory message element to mand list */ stravltree_add(conn->mand, af->item_id); } if(conn->elem_end){ afrc = conn->elem_end(conn,af,afrc,cw_get_elem_data(elem), elem_len,from); } }